JP4724082B2 - Image forming apparatus - Google Patents

Description

The present invention includes a plurality of toner bottles containing toner, an image forming apparatus including the supply equipment for supplying toner to the supply destination of the toner.

  In an image forming apparatus that develops with toner, such as a copying machine, a facsimile machine, and a multifunction machine, the toner can be supplied to the developing apparatus by a toner replenishing device such as a toner cartridge that contains a certain amount of toner, and images can be output continuously. It is configured to be possible.

  The toner is supplied to the developing device by directly supplying the toner from the toner cartridge containing the toner to the developing device (see Patent Document 1), and the toner in the toner cartridge is conveyed from a predetermined position to the developing device by a screw. And the like (see Patent Document 2).

  In the configuration in which the toner is directly supplied from the toner cartridge to the developing device, the fluidity of the supplied toner is likely to fluctuate, which causes image quality fluctuation. In addition, in the case of a toner with good fluidity that has taken measures against fluidity deterioration due to long-term standing or the like, an excessive amount of toner is supplied to the developing device, and the toner concentration of the developer increases. There is a problem of affecting the image quality and tone.

  On the other hand, in the configuration in which toner is transported and supplied by a screw, in order to cope with high-speed printing, if a large amount of toner is to be transported, it is necessary to enlarge the toner cartridge body so that the screw is not loaded. That is, there is a problem that the proportion of toner that can be stored with respect to the volume inside the toner cartridge is reduced.

  Therefore, there has been proposed a technique for conveying toner to a desired position by rotating the toner cartridge itself without using a screw (see Patent Documents 3 to 5).

  With such a configuration, it is not necessary to provide a screw for toner conveyance inside the toner cartridge, so there is no need to consider the load of the screw when conveying the toner, and the proportion of toner that can be accommodated in the toner cartridge is increased. it can.

  In the above technique, the toner is directly discharged from the toner cartridge, so that the toner can be stably conveyed depending on the amount of toner contained in the toner cartridge, the rotation speed of the toner cartridge, and the like. This causes a problem that toner cannot be stably supplied to the developing device.

  Patent Documents 6 and 7 disclose a toner replenishing device that temporarily stores the toner transported and discharged from the toner cartridge and supplies it to the developing device in order to realize stable toner supply. Accordingly, even when the toner cartridge body is rotated to convey and discharge the toner, the toner discharged from the toner cartridge can be stably supplied to the developing device by the toner supply device. .

  Patent Document 8 discloses a toner replenishing device in which a large amount of toner can be stored and a plurality of toner cartridges can be mounted so that the toner cartridges can be easily replaced.

JP 2003-162143 A Japanese Patent Laid-Open No. 10-142936 JP-A-7-20705 JP-A-8-339115 JP-A-6-348127 JP 2004-317592 A JP 2003-316138 A JP-A-8-137227

  In the conventional technology described above, the instability of the toner supply amount has not been solved yet, and the toner amount of the toner supply device or the developing device is not stabilized.

  Also, the instability of the toner supply amount from the toner cartridge becomes more prominent as the toner remaining in the toner cartridge decreases, so the toner cannot be used up and the cartridge must be replaced with the toner remaining in the toner cartridge. Must be done.

An object of the present invention, can be replenished stable toner is to provide the images forming apparatus capable of use up the toner.

The present invention includes a developing device, a plurality of toner bottles containing toner, from the toner bottle to the developing device, and a supply device toner bottle according to the amount of remaining toner in the developing device for supplying toner by rotating In the image forming apparatus for forming an image by electrophotography based on the toner image developed by the developing device ,
Setting means for setting a printing rate as information relating to image formation;
Judging means for judging whether the printing rate is 75% or more,
The replenishing device is
A bottle remaining amount detector for detecting the remaining amount of toner contained in the toner bottle;
When the toner from the developing device is discharged, a developing device remaining amount detecting device for detecting the remaining amount of toner in the developing device,
A detecting means for detecting a decrease in a toner replenishment amount per unit time of a main bottle which is a toner bottle replenishing toner to the developing device , and supplying toner from the main bottle to the developing device for a predetermined reference time. Detecting that the toner replenishment amount per unit time of the main bottle has decreased when the remaining toner amount of the developing device detected by the developing device remaining amount detector does not exceed a predetermined remaining amount Means,
When the toner is replenished from only the main bottle to the developing device in accordance with the remaining amount of toner in the developing device , the detection means detects that the amount of toner replenished per unit time of the main bottle has decreased. Then, the main bottle is rotated for a time during which the main bottle can be replenished to the developing device by an amount equal to the amount of toner discharged from the developing device at the predetermined reference time, and toner is supplied from the main bottle to the developing device. A controller that controls the toner to be supplied from another toner bottle different from the main bottle to the developing device ;
When the control unit determines that the printing rate set as information relating to image formation is 75% or more by the determination unit when toner is supplied from only the main bottle to the developing device, Even if it is not detected by the detection means that the toner replenishment amount per unit time of the main bottle has decreased, the amount of toner discharged from the developing device is the same as the amount of toner discharged from the developing device at the predetermined reference time. The main bottle is rotated for a time during which the amount can be replenished from the main bottle to the developing device, and toner is replenished from the main bottle to the developing device, and then from another toner bottle different from the main bottle to the developing device. An image forming apparatus that controls to replenish toner .

  In the invention, it is preferable that the control unit selects, as a main bottle, a toner bottle having the smallest remaining amount of toner among a plurality of toner bottles.

According to the present invention, the control unit detects the developing device when the developing device remaining amount detector detects that the remaining amount of toner in the developing device exceeds a predetermined remaining amount, or by the developing device remaining amount detector. The toner supply from the toner bottle to the developing device is stopped after replenishing for a predetermined time after it is detected that the remaining amount of toner exceeds a predetermined remaining amount .

According to the present invention, the control unit counts the time when toner is replenished by a plurality of toner bottles, and determines that the main bottle is empty when the measured time exceeds a predetermined time. It is characterized by that.

According to the present invention, the control unit counts the number of times the toner is replenished by a plurality of toner bottles, and determines that the main bottle is empty when the counted number exceeds a predetermined number. It is characterized by that.

The present invention is characterized in that the control unit, the main bottle when it is determined that the empty, selecting the smallest toner bottle toner over the remaining amount of the different toner bottle from the main bottle as a new main bottle And

According to the present invention, when only the main bottle is a toner bottle that supplies toner to the developing device to a developing device, and supplying the toner according to the amount of remaining toner in the developing device, the main by the detection means bottle When it is detected that the toner replenishment amount per unit time has decreased, the main amount of toner discharged from the developing device during the predetermined reference time is the same as the amount of toner that can be replenished from the main bottle to the developing device . The bottle is rotated to supply toner from the main bottle to the developing device, and then the toner is supplied from another toner bottle different from the main bottle to the developing device .

Since a plurality of toner bottles are supplied simultaneously, stable toner replenishment is possible, and even if the toner bottle is empty, replenishment can be continued without stopping. Furthermore, since the toner can be replenished even when the remaining amount of toner in the main bottle is small, it can be used up until the remaining amount of toner in the main bottle becomes empty.
Further, when the toner remaining amount of the developing device detected by the developing device remaining amount detector does not exceed the predetermined remaining amount even when toner is supplied from the main bottle to the developing device for a predetermined reference time, It is detected that the toner replenishment amount per unit time has decreased.
Thereby, it is possible to easily detect a decrease in the toner replenishment amount.
Further, when the detecting means detects that the toner replenishment amount per unit time of the main bottle is reduced, the same amount as the amount of toner discharged from the developing device at the predetermined reference time is discharged from the main bottle. and only by rotating the main bottle time to supply to the developing device, after supplying the toner from the main bottle to the developing device, also supplies toner to the developing device from the different other toner bottle from the main bottle.
Thereby, replenishment from other toner bottles can be performed with a sufficiently small amount of toner replenishment from the main bottle.
In addition, when the control unit determines that the printing rate set as the information related to image formation is 75% or more by the determination unit when toner is supplied to the developing device from only the main bottle, the detection is performed. Even if it is not detected by the means that the toner replenishment amount per unit time of the main bottle has decreased, the main bottle is supplied with the same amount as the amount of toner discharged from the developing device at the predetermined reference time. The main bottle is rotated for a time that can be replenished to the developing device from the main bottle so that the toner is replenished from the main bottle to the developing device, and then the toner is replenished to the developing device from another toner bottle different from the main bottle. .
As a result, although the remaining amount of toner is sufficient, even if the sufficient replenishment cannot be performed depending on the printing rate, the replenishment can be performed stably.

  According to the present invention, the toner bottle with the least amount of toner among the plurality of toner bottles is selected as the main bottle.

  As a result, the toner can be used from the toner bottle with a small amount of toner remaining without the operation of the plurality of toner bottles being mixed.

According to the invention, when the developing device remaining amount detector detects that the remaining amount of toner in the developing device exceeds a predetermined remaining amount , or the developing device remaining amount detector detects the remaining amount of toner in the developing device. After replenishment for a predetermined time after it is detected that the predetermined remaining amount is exceeded , replenishment of toner to the developing device is stopped.

Thereby, excessive replenishment to the developing device can be prevented.
In addition, according to the present invention, the time when toner is replenished by a plurality of toner bottles is counted, and it is determined that the main bottle has been emptied when the counted time exceeds a predetermined time.

According to the present invention, the number of times toner is replenished by a plurality of toner bottles is counted, and it is determined that the main bottle has been emptied when the counted number exceeds a predetermined number.

Thereby, it can be easily determined that the toner bottle is empty.
According to the present invention, the main bottle when it is determined that the empty, selecting the smallest toner bottle toner over the remaining amount of the different toner bottle as a new main bottle main bottle.

  Thereby, even when the main bottle is switched, the toner can be used from the toner bottle with a small remaining amount of toner.

The best mode for carrying out the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic cross-sectional view illustrating a configuration of an image forming apparatus 1 including a developing device 23 according to an embodiment of the present invention.

  The image forming apparatus 1 is a developer formed on the photosensitive drum 21 (21a, 21b, 21c, 21d) by a developer (hereinafter simply referred to as toner) supplied by the developing roller 231 based on the image data. The image is transferred to a recording sheet through a transfer process. The image forming apparatus 1 includes a developing device 23 (23a, 23b, 23c, 23d) having a toner bottle (toner storage unit) 200 (200a, 200b, 200c, 200d) that stores toner, and supplies the toner thereto. A toner replenishing device 100 (100a, 100b, 100c, 100d) is provided, and toner is automatically supplied to the developing device 23 to form an image.

  As shown in FIG. 1, the image forming apparatus 1 to which the developing device 23 according to the present embodiment is mounted has a developer image (hereinafter referred to as a developer image) formed of toner that matches each hue in accordance with color-separated image data. A photosensitive drum 21 (21a, 21b, 21c, 21d) on which a toner image is formed, and a developing device 23 (23a, 23b, 23c, 23d) for supplying the developer onto the surface of the photosensitive drum 21. 23d) and a plurality of process printing units (image forming means) 20 (20a, 20b, 20c, 20d), and laser light (on each photosensitive drum 21 for each color based on the image data). A transfer belt unit 30 having an endless transfer belt 31 that conveys the supplied recording paper; The toner image transferred to the recording sheet by heat roller 27a and pressing roller 27b and a fixing unit 27 for thermally fixing.

First, the overall configuration of the image forming apparatus 1 will be described.
As shown in FIG. 1, the image forming apparatus 1 according to the present embodiment is a so-called digital color printer that separates image data and forms an image for each hue to output a full color image. A multicolor image or a single color image is formed on a recording sheet based on a print job from an information processing apparatus (not shown) such as a personal computer connected to the outside. To form.

  The image forming unit 108 uses an electrophotographic method to form a multicolor image using toner of each color of yellow (Y), magenta (M), cyan (C), and black (BK). The image forming apparatus includes an exposure unit 10, a process printing unit 20, a fixing unit 27, a transfer belt unit 30 as a transfer means including a transfer belt 31, a transfer roller 36, and a transfer belt cleaning unit 37.

  Each unit of the image forming unit 108 is generally arranged as follows. The fixing unit 27 is disposed on the upper end of the housing 1 a of the image forming apparatus 1, and the transfer belt unit 30 is disposed below the fixing unit 27 from one end of the housing 1 a to the other end. A process printing unit 20 is disposed below the transfer belt unit 30, and an exposure unit 10 is disposed below the process printing unit 20.

  A transfer belt cleaning unit 37 is provided on the other end side of the transfer belt unit 30. Further, a paper discharge tray 43 is provided adjacent to the fixing unit 27 above the image forming unit 108. A paper feeding unit 109 is configured below the image forming unit 108.

  In this embodiment, four process printing units 20a, 20b, 20c, and 20d corresponding to each color of black (BK), yellow (Y), magenta (M), and cyan (C) are transferred as the process printing unit 20. The belts 31 are sequentially provided along the belt 31.

  These process printing units 20 (20a, 20b, 20c, 20d) are arranged side by side in a substantially horizontal direction (left-right direction in the figure) in the housing 1a, and are photosensitive drums 21 (21a, 21a, 21b) that are image carriers for each color. 21b, 21c, 21d), a charger (charging means) 22 (22a, 22b, 22c, 22d) for charging the photosensitive drum 21, a developing device (developing means) 23 (23a, 23b, 23c, 23d), a cleaner Units 24 (24a, 24b, 24c, 24d) and the like are provided.

  Here, the symbols a, b, c, and d attached to the components corresponding to the respective colors correspond to the respective colors of black (BK), yellow (Y), magenta (M), and cyan (C). However, in the following description, the components provided for each color are collectively referred to as the photosensitive drum 21, the charging unit, except for the case where a component corresponding to a specific color is specified and described. The device 22, the developing device 23, and the cleaner unit 24 are described.

  The photosensitive drum 21 is disposed such that a part of the outer peripheral surface thereof is in contact with the surface of the transfer belt 31, and the charger 22, the developing device 23, and the cleaner unit as an electric field generating unit along the outer peripheral surface of the drum. 24 are arranged close to each other.

  As the charger 22, a corona wire charger type charger is used, and is arranged close to the outer peripheral surface of the photosensitive drum 21 on the substantially opposite side to the position where the transfer belt unit 30 is arranged with the photosensitive drum 21 interposed therebetween. . In the present embodiment, a corona wire charger type charger is used as the charger 22. However, instead of the corona wire charger type charger, a fur brush type charger, a magnetic brush type charger, a roller type charger, a saw tooth Any type charger, ion generating charging device or the like can be used without particular limitation as long as it can impart desired chargeability to the photosensitive drum.

  The developing device 23 stores toner of each color of yellow (Y), magenta (M), cyan (C), and black (BK) for each of the developing devices 23a, 23b, 23c, and 23d. It is arranged downstream of the charger 22 in the drum rotation direction (the direction of arrow A in the figure).

  The developing devices 23a, 23b, 23c, and 23d include five toner replenishers 500a for replenishing toner to the developing devices 23a, 23b, 23c, and 23d in order to be capable of high-speed and high-volume printing. , 500b, 500c, and 500d, toner supply devices 100a, 100b, 100c, and 100d are provided. The developing rollers 231a, 231b, 231c, and 231d are arranged to face the photosensitive drums 21a, 21b, 21c, and 21d, respectively, and toner images formed on the outer peripheral surfaces of the photosensitive drums 21a, 21b, 21c, and 21d, respectively. Each color toner is supplied to be visualized.

  As toner for replenishment, black (BK) is used for the toner replenishment unit 500a, cyan (C) toner is used for the toner replenishment unit 500b, magenta (M) toner is used for the toner replenishment unit 500c, and yellow ( Y) toner is stored.

  Two toner replenishing portions 500a for black (BK) developer are provided in parallel so that large-scale printing can be performed in consideration of normally used mono black printing.

  Each toner replenishing section 500 is disposed almost directly above the developing device 23 that develops using the corresponding developer, and the toner replenishing passage body 612 ( 612a, 612b, 612c, 612d).

  The supply passage body 612a for supplying black (BK) developer has a structure in which the toner from the two toner supply devices 100a and 100a is collectively supplied to the developing device 23a.

  The cleaner unit 24 is disposed upstream of the charger 22 in the photosensitive drum rotation direction. Further, the cleaner unit 24 includes a cleaning blade 241, and is configured to contact and arrange the cleaning blade 241 along the outer peripheral surface of the photosensitive drum 21 to scrape and collect residual toner on the photosensitive drum 21. ing. Reference numeral 242 in the figure denotes a conveying screw that conveys the collected toner.

  In this embodiment, the cleaning blade 241 is used. However, the present invention is not particularly limited to these configurations. One or more cleaning blades may be used, or a fur brush or a magnetic brush may be used alone. A cleaning blade, a fur brush, and a magnetic brush may be used in combination. Any device configured to scrape and collect residual toner on the photosensitive drum 21 can be used.

  The exposure unit 10 mainly includes a box-shaped housing 10a, a laser scanning unit (LSU) 11 having a laser irradiation unit 11a disposed therein, a polygon mirror 12, and laser light for each color. Mirrors 13a, 13b, 13c, 13d, 14a, 14b, and 14c.

  Laser light emitted from the laser irradiation unit of the laser scanning unit 11 is color-separated by the polygon mirror 12 and an fθ lens (not shown), and then reflected by the reflection mirrors 13a to 13c, and the respective photosensitive drums 21a for each color. , 21b, 21c, and 21d.

  The laser scanning unit 11 may be configured to use a writing head in which light emitting elements such as EL (Electro Luminescence) and LED (Light Emitting Diode) are arranged in an array instead of a laser irradiation unit, or a light source The liquid crystal shutter may be used, and any structure that can form an electrostatic latent image on the photosensitive drum 21 can be used.

  As shown in FIG. 1, the transfer belt unit 30 mainly includes a transfer belt 31, a transfer belt drive roller 32, a transfer belt driven roller 33, and intermediate transfer rollers 35a, 35b, 35c, and 35d.

  In the following description, when the intermediate transfer rollers 35a, 35b, 35c, and 35d are used as a whole, they are described as the intermediate transfer roller 35.

  The transfer belt 31 is endlessly formed using a film having a thickness of about 75 μm to 120 μm. As a material of the transfer belt 31, polyimide, polycarbonate, a thermoplastic elastomer alloy, or the like is mainly used.

  Further, the transfer belt 31 is stretched by a transfer belt driving roller 32, a transfer belt driven roller 33, and an intermediate transfer roller 35 so that the surface thereof is in contact with the outer peripheral surface of the photosensitive drum 21. It is configured to move in the sub-scanning direction (arrow B direction in the figure) by the driving force.

  The transfer belt drive roller 32 is disposed on one end side of the housing 1a, conveys the transfer belt 31 by applying a driving force to the transfer belt 31, and presses the recording paper between the transfer belt 31 and the transfer roller 36. Convey the recording paper.

  The transfer belt driven roller 33 is disposed on the other end side of the housing 1a, and the transfer belt 31 and the transfer belt driving roller 32 are laid substantially horizontally from the fixing unit 27 side to the other end side of the housing 1a. When the size of the image forming apparatus 1 in the sub-scanning direction is reduced, or when the installation area in the so-called width direction is reduced, the transfer belt 31 together with the transfer belt drive roller 32 is moved from the fixing unit 27 side to the housing 1a. It is possible to have one of them inclined to the other end side, and it may be appropriately set to various appropriate arrangements and sizes such as a photoreceptor, development, laser irradiation unit, fixing, etc. .

  The intermediate transfer roller 35 is disposed in the inner space of the transfer belt 31 that is wound from the transfer belt driving roller 32 to the transfer belt driven roller 33. The transfer belt 31 is disposed at a position shifted to the downstream side in the moving direction, presses the inner surface of the transfer belt 31, and the outer surface of the transfer belt 31 winds a part of the outer peripheral surface of the photosensitive drum 21. You may provide so that a predetermined | prescribed nip amount may be obtained.

  The intermediate transfer roller 35 includes a shaft made of a metal (for example, stainless steel) having a diameter of 8 to 10 mm, and the outer peripheral surface of the metal shaft is covered with an elastic material having conductivity such as EPDM or urethane foam. It is not necessary to limit to these elastic materials.

  The intermediate transfer roller 35 configured as described above has a high voltage transfer bias for transferring the toner image formed on the photosensitive drum 21 to the transfer belt 31, that is, a polarity opposite to the toner charging polarity (negative). A (positive) high voltage is applied, and the high voltage is uniformly applied to the transfer belt 31 by the elastic material.

  Each of the above-described photosensitive drums 21 is visualized in accordance with each hue, and the toner images are stacked on the transfer belt 31 to form a color toner image based on the image data input to the apparatus. The color toner images stacked in this way are transferred onto a recording sheet by a transfer roller 36 disposed at a contact position of the transfer belt 31.

  The transfer roller 36 transfers the developer image transferred to the transfer belt 31 to a recording sheet. The transfer roller 36 is disposed so as to face the transfer belt drive roller 32 in a substantially horizontal and parallel manner and to press-contact the transfer belt 31 wound around the transfer belt drive roller 32 at a predetermined nip. A voltage for transferring the color toner image formed on the transfer belt 31 onto the recording paper, that is, a high voltage having a polarity (positive) opposite to the charging polarity (negative) of the toner is applied. Yes.

  Further, in order to constantly obtain a nip between the transfer belt 31 and the transfer roller 36, either the transfer belt driving roller 32 or the transfer roller 36 is made of a hard material such as metal, and the other roller Is made of a soft material such as elastic rubber or foamable resin.

  A registration roller 26 is provided below the transfer belt driving roller 32 and the transfer roller 36. The registration roller 26 is configured to convey the leading edge of the recording paper supplied from the paper feeding unit 109 and the leading edge of the toner image on the transfer belt 31 to the transfer roller 36 side in alignment.

  Further, as described above, the toner adhered to the transfer belt 31 due to the contact with the photosensitive drum 21 or the toner remaining on the transfer belt 31 without being transferred onto the recording paper by the transfer roller 36 is used in the next step. Since it causes color mixing, it is removed and collected by the transfer belt cleaning unit 37.

  The transfer belt cleaning unit 37 is provided in the vicinity of the transfer belt driven roller 33 and disposed so as to contact (or slide) the transfer belt 31, and the residual toner on the transfer belt 31 by the cleaning blade 37a. And a box-shaped toner collecting portion 37b for temporarily storing the toner (waste toner) scraped off, and scraping and collecting the residual toner on the transfer belt 31.

  Further, the transfer belt cleaning unit 37 is disposed in the vicinity of the process printing unit 20a on the upstream side in the moving direction of the transfer belt 31 from the process printing unit 20a. The portion of the transfer belt 31 where the cleaning blade 37 a contacts the outer surface is supported by the transfer belt driven roller 33 on the inner surface.

  The fixing unit 27 includes a pair of fixing rollers 271 constituted by a heating roller 27 a and a pressure roller 27 b, and a conveying roller 27 c above the fixing roller 271, and carries recording paper from below the fixing roller 271. Then, it is carried out above the conveying roller 27c.

  Further, a paper discharge roller 28 is provided above the fixing unit 27, and the recording paper conveyed from the conveyance roller 27 c is discharged onto the paper discharge tray 43 by the paper discharge roller 28.

  The fixing of the toner image by the fixing unit 27 is performed by controlling heating means (not shown) such as a heater lamp provided inside or close to the heating roller 27a based on a detection value of a temperature detector (not shown). The heating roller 27a is kept at a predetermined fixing temperature. The toner image is heat-fixed on the recording paper by heating and pressing the recording paper on which the toner image has been transferred while being rotated and conveyed between the heating roller 27a and the pressure roller 27b.

  Adjacent to the fixing unit 27, a double-sided document conveyance path S3 for double-sided printing is provided on the other end side of the fixing unit 27 toward the lower sheet feeding unit 109, and on the double-sided document conveyance path S3. In the state where the recording paper is reversed by the conveying rollers 29 a and 29 b arranged in parallel in the vertical direction, the recording paper is conveyed again toward the transfer roller 36.

  Specifically, the transport roller 29a is disposed on the other end side of the fixing unit 27, and the transport roller 29b is disposed below the transport roller 29a.

  In this embodiment, a heating means such as a heater lamp is used, but an induction heating method may be used or may be used in combination. Further, any means may be used as long as it is an appropriate method capable of uniformly heat-fixing the toner image on the recording paper without disturbing the toner image without using a roller.

  The paper feed unit 109 includes a manual feed tray 41 and a paper feed cassette 42 for storing recording paper used for image formation, and separates the recording paper from the manual feed tray 41 and the paper feed cassette 42 one by one. It supplies to the formation part 108.

  The manual feed tray 41 is provided at one end (right side in the drawing) of the casing 1a of the image forming apparatus 1, and is configured to be housed at one end when not in use. When the user places a small number (necessary number) of recording sheets of the type desired by the user in the outwardly expanded state, the recording sheets are taken into the casing 1a of the image forming apparatus 1 and conveyed one by one. It is sent to the route S1.

  A pickup roller 41a is provided on the side of the exposure unit 10 in the housing 1a of the image forming apparatus 1 on the downstream side in the recording paper feeding direction (in the direction of arrow C in the figure) by the manual feed tray 41. A conveying roller 41b is provided substantially horizontally on the downstream side in the paper feeding direction.

  The pickup roller 41a contacts the surface of one end portion of the recording paper fed from the manual feed tray 41 and reliably conveys the paper one by one by the frictional resistance of the roller.

  The above-described pickup roller 41a and transport rollers 41b, 41c, and 41d constitute a recording paper transport path S1.

  The paper feed cassette 42 is provided below the image forming unit 108 and the exposure unit 10 in the housing 1a, and can accommodate recording paper having a size defined by the specifications of the apparatus or a size predetermined by the user. It has become.

  A pickup roller 42a is provided on one end portion (left end portion in the figure) of the paper feed cassette 42, and a conveyance roller 42b is provided downstream of the pickup roller 42a in the recording paper conveyance direction.

  The pickup roller 42a contacts the surface of one end of the recording paper at the top of the recording paper loaded and accommodated in the paper feeding cassette 42 in response to an output request, and reliably picks up and conveys one sheet at a time by the frictional resistance of the roller. To do.

  The conveyance roller 42b conveys the recording sheet fed from the pickup roller 42a upward to the image forming unit 108 along the recording sheet conveyance path S2 formed on one end side in the housing 1a.

Next, an image forming process performed by the image forming apparatus 1 according to the present embodiment will be described.
The image forming apparatus 1 transfers the toner image on the photosensitive drum 21 onto the recording paper supplied from the paper supply unit 109 via the transfer belt 31 by a so-called intermediate transfer method (offset method).

  First, the charger 22 uniformly charges the outer peripheral surface of the photosensitive drum 21 to a predetermined potential. By irradiating the charged photosensitive drum 21 with laser light from the exposure unit 10, an electrostatic latent image for each color is generated on the photosensitive drum 21 for each color.

  Next, toner is supplied from the developing device 23 (23a, 23b, 23c, 23d) to each outer peripheral surface of the photosensitive drum 21 (21a, 21b, 21c, 21d), and formed on the outer peripheral surface of the photosensitive drum 21. The electrostatic latent image thus made is visualized as a toner image with toner.

Then, the toner image generated on the photosensitive drum 21 is transferred to the transfer belt 31.
The transfer of the toner image from the photosensitive drum 21 to the transfer belt 31 is performed by applying a high voltage to the intermediate transfer roller 35 disposed in contact with the back side of the transfer belt 31.

  By applying a high voltage with a polarity (positive) opposite to the charging polarity (negative) of the toner to the intermediate transfer roller 35, the transfer belt 31 is uniformly applied with a high voltage and has a reverse polarity (positive). . As a result, the charged polarity (negative) toner image on the photosensitive drum 21 is transferred onto the transfer belt 31 when the photosensitive drum 21 is in rotational contact with the transfer belt 31.

  The toner images of the respective colors formed on the respective photoconductive drums 21 are yellow (Y), magenta (M), cyan (C), black as the transfer belt 31 moves and makes rotational contact with the respective photoconductive drums 21. The images are transferred in the order of (BK), and a color toner image is formed on the transfer belt 31.

  In this way, the electrostatic latent image visualized with toner on the photosensitive drum 21 for each color is laminated on the transfer belt 31, and the print image is reproduced on the transfer belt 31 as a multicolor toner image. The

  The multicolor toner image transferred onto the transfer belt 31 is transferred from the transfer belt 31 onto the recording paper by the transfer roller 36 at a position where the transfer belt 31 moves and the recording paper and the transfer belt 31 overlap. The

  The toner adhering to the transfer belt 31 due to contact with the photosensitive drum 21 or the toner remaining on the transfer belt 31 without being transferred onto the recording paper by the transfer roller 36 causes toner color mixing in the next step. Therefore, it is removed and collected by the transfer belt cleaning unit 37.

Next, the recording paper supply operation by the paper supply unit 109 will be described.
When recording paper placed on the manual feed tray 41 is used, the recording paper is fed into the apparatus one by one from the manual feed tray 41 by the pickup roller 41a at a timing controlled by an instruction on an operation panel (not shown). It is captured.

  The recording sheet taken into the apparatus is conveyed to the image forming unit 108 along the recording sheet conveying path S1 by the conveying roller 41b.

  On the other hand, when recording paper stored in the paper feed cassette 42 is used, the recording paper is separated and fed one by one from the paper feed cassette 42 by the pickup roller 42a in response to an output request, and the recording paper is conveyed by the conveyance roller 42b. It is conveyed along the path S2 to the upper image forming unit.

  The recording paper transported from the manual feed tray 41 and the paper feed cassette 42 is transported to the transfer roller 36 side at the timing when the leading edge of the recording paper and the leading edge of the toner image on the transfer belt 31 are aligned by the registration roller 26. The toner image on the transfer belt 31 is transferred onto the recording paper.

  The recording sheet on which the toner image has been transferred is conveyed substantially vertically and reaches the fixing unit 27, where the toner image is thermally fixed on the recording sheet by the heating roller 27a and the pressure roller 27b.

  The recording paper that has passed through the fixing unit 27 is discharged face down onto the paper discharge tray 43 by the paper discharge roller 28 in the case of a single-sided print request.

  On the other hand, in the case of a double-sided printing request, after the recording paper is chucked by the paper discharge roller 28, the paper discharge roller 28 is rotated in the reverse direction to guide the recording paper to the double-sided document transport path S3 and again by the registration rollers 29a and 29b. 26.

  At this time, the front side of the recording sheet is reversed while the surface to be transferred is reversed. That is, the end that becomes the start side during the first transfer is the end side during the back transfer, and the end that becomes the end side during the first transfer is the start side during the back transfer.

  After the toner image is transferred and thermally fixed on the back surface of the recording paper, it is discharged onto the paper discharge tray 43 by the paper discharge roller 28.

In this way, the transfer operation to the recording paper is performed.
Hereinafter, the configurations of the developing device 23 and the toner replenishing device 100 will be described in detail.

Figure 2 is a schematic sectional view showing a configuration of a current image device 23 and the toner supply device 100, FIG. 3 is a front view illustrating the configuration of the developing device 23 and toner supply device 100, FIG. 4, the current image FIG. 5 is a perspective view of the device 23 , FIG. 5 is a perspective view showing an example of mounting when the toner supply unit is mounted on the toner supply unit mounting mechanism constituting the toner supply device 100, and FIG. It is a perspective view of a mounting mechanism.

First, the developing device 23 will be described.
As shown in FIGS. 2 and 3, in the developing device 23, a toner introduction port 234 a for introducing a developer is formed in an upper part of a housing 234 that forms an exterior portion, and development is performed inside the housing 234. A roller 231, a first toner transport roller 232, and a second toner transport roller 233 are disposed, and are mounted on the image forming apparatus main body in a state where the developing roller 231 is in contact with or close to the photosensitive drum 21. The toner introduction port 234a of the developing device 23 is formed outside the transfer belt width W on the same side as the toner supply port 611 of the toner supply unit mounting mechanism 600.

  The first toner conveyance roller 232 and the second toner conveyance roller 233 are arranged on the bottom side of the housing 234, and the axis of each roller is arranged in parallel along the axis direction of the developing roller 231. The toner supplied into the housing 234 is conveyed to the developing roller 231 while being stirred together with the developer. The developing roller 231 is disposed in a state where a part of the outer peripheral surface is exposed from the opening 235 on the upper side of the first toner conveying roller 232.

  The housing 234 has a rectangular parallelepiped shape extending in a direction (transfer belt width direction) perpendicular to a transfer direction (transfer belt conveyance direction) in a state of being mounted on the image forming apparatus main body, and the developing device 23 is connected to the image forming apparatus. An opening 235 is formed so that the developing roller 231 and the photosensitive drum 21 that are present in the state of being mounted on the main body face each other.

  The opening 235 is formed to be long in the width direction of the housing 234 along the axial direction of the developing roller 231 so that at least the developing roller 231 can come into contact with the photosensitive drum 21. A blade 236 is provided at the lower edge of the opening 235 in the drawing along the axial direction of the developing roller 231. The blade 236 is provided so as to form a predetermined gap between the edge of the blade 236 and the surface of the developing roller 231, and this gap regulates the amount of toner attached to the surface of the developing roller 231, A fixed amount of toner is supplied to the drum 21.

The toner replenishing device 100 is disposed on the upper side of the developing device 23 configured as described above.
7A and 7B are external views showing the configuration of the toner replenishing unit 500 that constitutes the toner replenishing device 100. FIG. 7A shows a side view and FIG. 7B shows a front view. FIG. 8 is an enlarged view showing the front end portion of the toner bottle 200 constituting the toner replenishing unit 500. FIG. 9 is an enlarged view showing a configuration in which a toner transporting scraper 203 is attached to the tip of the toner bottle 200. FIG. 10 is a schematic view showing the shape of the scraper 203, and FIG. 11 is a schematic view when the scraper 203 shown in FIG. FIG. 12 is a front view of the toner bottle 200 to which the scraper 203 is attached. FIG. 13 is a perspective view showing the configuration of the bottle support member 300 that constitutes the toner replenishing device 100. FIG. 14 is an external view showing the shapes of the casings 301 and 302 constituting the bottle support member 300. FIG. 14A shows the first housing 301, and FIG. 14B shows the second housing. FIG. 15 is a diagram showing the relationship between the toner discharge chamber of the bottle support member 300 and the arrangement position of the scraper 203 of the toner bottle. FIG. 16 is a schematic cross-sectional view showing the configuration of the tip of the toner bottle.

  In the present embodiment, the toner replenishing units 500a, 500b, 500c, and 500d constituting the toner replenishing device 100 (100a, 100b, 100c, and 100d) mounted on the image forming apparatus 1 can be used regardless of the color of toner to be replenished. Have the same structure.

  The toner replenishing device 100 mainly includes a toner replenishing unit 500 having a toner bottle 200 containing toner, and a bottle support member 300 that rotatably supports the toner bottle 200 on one end side, and the toner replenishing device. A toner replenishing unit mounting mechanism 600 for supplying toner to the developing device 23 when the unit 500 is mounted.

  On the bottom surface of the bottle support member 300 (the bottom surface when the toner replenishing device 100 is attached to the image forming apparatus 1), as shown in FIG. 7B, the toner replenished from the toner bottle 200 is supplied from the bottle support member 300. A shutter mechanism 400 that opens and closes a toner discharge port for discharging to the outside is provided.

  That is, when the toner discharge port of the bottle support member 300 is opened by the shutter mechanism 400, the toner discharge port and the replenishment passage body 612 of the toner replenishing portion mounting mechanism 600 are in communication with each other and connected to the developing device 23. The toner is supplied from the toner bottle 200 to the developing device 23 through the supply passage body 612.

First, the toner bottle 200 will be described.
The toner bottle 200 has a main body portion 201 formed in a bottomed cylindrical shape. When the end portion of the main body portion 201 supported by the bottle support member 300 is a front end portion 201a, the front end portion 201a Has an opening for discharging the toner. The rear end 201b, which is the end opposite to the front end 201a, is closed.

  A plurality of grooves 201 c that are recessed toward the rotation axis X are formed on the surface of the main body 201 so as to extend in the circumferential direction. In addition, inside the main body 201, a portion corresponding to the groove 201c is a protruding portion having a shape protruding toward the rotation axis X.

  The groove formed between the protrusions in the main body 201 functions as a guide groove for guiding the toner stored in the main body 201 from the rear end 201b toward the front end 201a.

  The groove 201c is formed so as to be inclined such that the lower end in the vertical direction is inclined toward the front end 201a and the upper end in the vertical direction is inclined toward the rear end 201b. As a result, the toner contained in the toner bottle 200 is rotated around the rotation axis X in the Y direction, that is, when viewed from the front end portion 201a, in the clockwise direction. It is conveyed from the rear end part 201b toward the front end part 201a.

  The groove 201c may have any shape as long as the toner accommodated by the rotation of the main body 201 can be conveyed from the rear end 201b toward the front end 201a.

  As shown in FIG. 8, the distal end portion 201 a is formed in a cylindrical shape having a smaller diameter than the central portion of the main body portion 201. A rib 202 protruding outward in the rotation axis X direction is formed on the tip surface 201d of the tip portion 201a.

  The rib 202 is adapted to be fitted to a drive unit of a rotation drive device (not shown) when the toner supply device 100 is mounted on the image forming apparatus 1. As a result, the toner bottle 200 rotates when the rotational driving force from the driving unit is transmitted through the rib 202.

  Further, as shown in FIGS. 9 and 10, a plurality of scrapers (toner transport bodies) 203 for transporting toner and a fixing member in which a base portion of the scraper 203 is integrally fixed to the peripheral surface 201 e of the tip portion 201 a (see FIG. 9 and 10). A toner conveying member 206 configured by a toner conveying member attaching portion) 204 is provided.

  The scraper 203 is made of a plate-like resin having elasticity such as rubber, and is provided substantially radially at a position obtained by dividing the surface of the fixing member 204 into eight equal parts in the circumferential direction, as shown in FIGS. Further, the free end side is formed to be bent in a “h” shape on the upstream side (rear side) along the rotation direction of the toner bottle 200 (the direction of arrow D in the figure).

  In the present embodiment, a radially configured portion of the scraper 203 on the fixing member 204 side is a toner conveying portion 203a, and a portion bent toward the upstream side (rear) in the rotation direction of the toner bottle 200 is a lid portion 203b.

  As shown in FIG. 13A, the toner transport unit 203 a is configured to be longer than the toner transport space in the bottle support member 300, and is incorporated in the bottle support member 300 in a state where the toner transport member 206 is attached to the toner bottle 200. When the toner bottle 200 is rotated, the free end side is inclined to the upstream side (rear side) in the toner bottle rotation direction.

  This is a configuration for scraping toner accumulated in the toner discharge chamber 300d without waste. However, if the length of the scraper 203 in the longitudinal direction of the toner conveying portion 203a is too long, the frictional force with the inner peripheral surface of the bottle support member 300 increases, and the rotational load increases, so the rotational load increases too much. It is preferable that the length is not so long.

  The lid portion 203b is formed such that the length W2 of the portion that is in sliding contact with the inner peripheral surface of the bottle support member 300 is longer than the opening length W1 of the toner discharge port 300b, and the lid portion 203b faces the toner discharge port 300b. The opening of the discharge port 300b is closed.

  The opening angle between the toner conveying portion 203a and the lid portion 203b is θ2 when the scraper 203 shown in FIG. 10 is open, and the scraper 203 shown in FIG. 13A is incorporated in the bottle support member 300. When θ1 is set, θ1 <θ2 is set. With the difference in opening angle, the lid 203b can be brought into close contact with the toner discharge port 300b by the elastic force of the scraper 203.

  The fixing member 204 has a cylindrical shape made of a stretchable material (general resin having elasticity such as rubber) and has an inner diameter smaller than the outer diameter of the tip portion 201a. A protrusion 204a protruding inward is formed on the surface.

  As shown in FIG. 11, the protrusion 204a is fitted into a notch 201f formed in advance on the outer peripheral surface 201e of the tip 201a.

  In the present embodiment, by using such a fixing member 204, the scraper 203 can be easily provided on the main body 201 by simply expanding the ring portion and attaching it to the peripheral surface 201e of the tip 201a. In addition, when the fixing member 204 is attached to the distal end portion 201a, the protruding portion 204a of the fixing member 204 is fitted into the notch 201f provided on the peripheral surface 201e of the distal end portion 201a, so that the distal end portion of the fixing member 204 is fitted. Fixing to 201a can be performed reliably. That is, the fixing member 204 can rotate integrally with the tip portion 201a without spinning around the peripheral surface 201e of the tip portion 201a.

The scraper 203 may be provided directly on the peripheral surface 201e of the tip 201a.
As shown in FIG. 12, a bottle-side toner discharge port 201h for discharging the toner contained in the main body 201 is formed on an end surface 201g that forms a step with the front end 201a of the main body 201.

  In this embodiment, an example in which the bottle side toner discharge port 201h is formed in a substantially rectangular shape is shown. However, the present invention is not limited to this, and if there is no problem in toner discharge, for example, a substantially square shape. It may have an opening shape such as a polygonal shape or a circular shape.

  Further, as shown in FIG. 12, the scraper 203 is adjusted when the fixing member 204 is mounted so that the position thereof is arranged at a predetermined angle α with respect to the center of the bottle side toner discharge port 201h.

  Here, the position where the scraper 203 is disposed is preferably a position that does not obstruct toner discharge from the bottle-side toner discharge port 201h, and the angle α may be any angle as long as it is such a position. The angle α is preferably 90 ° in order to reliably prevent toner discharge failure from the bottle side toner discharge port 201h.

  The toner discharged from the bottle-side toner discharge port 201h is accommodated in a bottle support member 300 provided so as to cover the front end portion 201a. The bottle support member 300 is formed with a toner discharge port for discharging the stored toner.

Next, the bottle support member 300 will be described.
As shown in FIGS. 7A and 7B, the bottle support member 300 is formed in a substantially cylindrical shape and is connected so as to cover the front end portion 201 a of the main body portion 201. The bottle support member 300 includes a first housing 301 and a second housing 302 that can be divided into two in the vertical direction, that is, the rotation axis X direction. An opening 300a is formed at the end of the bottle support member 300 so that the rib 202 provided on the tip surface 201d of the tip 201a is exposed.

  A plate-like first fixing member (guide portion) 303 and second fixing member (guide portion) 304 for mounting and fixing the toner supply device 100 to the image forming apparatus 1 are provided on the surface of the first housing 301. Are formed in parallel with each other.

  Between the first fixing member 303 and the second fixing member 304, as shown in FIG. 7B, there is a shutter mechanism 400 that controls the discharge of the toner replenished from the toner replenishing device 100 to the outside. Is provided.

  Accordingly, the first fixing member 303 and the second fixing member 304 are adjusted to a height that secures a clearance between the bottle support member 300 and the image forming apparatus 1 so that the shutter mechanism 400 functions.

  Moreover, the 1st fixing member 303 and the 2nd fixing member 304 are respectively comprised from a pair of rib body 303a, 303b and rib body 304a, 304b, as shown to Fig.7 (a) and FIG.13 (b). The pair of rib bodies 303a and 303b and the rib bodies 304a and 304b are provided at a predetermined interval, and a space partitioned by the rib bodies guides the movement of the toner along the axial direction of the toner bottle 200. Functions as the sections 303c and 304c.

  As shown in FIGS. 14A and 14B, the bottle support member 300 has a toner discharge port 300 b formed between the first fixing member 303 and the second fixing member 304, that is, between the first fixing member 303 and the second fixing member 304. Has been. The toner discharge port 300b is opened and closed by the shutter mechanism 400.

  As shown in FIG. 14A, in the first housing 301, a first dam portion 301b for blocking toner is formed on the inner peripheral surface 301a in the vicinity of the toner discharge port 300b described above. An inner wall 301c extends from the one weir 301b on the opposite side to the toner discharge port 300b in the circumferential direction. The inner wall portion 301 c is provided substantially parallel to a contact surface 301 d which is one end surface inside the first housing 301 with a predetermined distance. This distance is set to be slightly larger than the width of the scraper 203 described above.

  As shown in FIG. 14B, in the second housing 302, a second dam portion 302b for blocking toner is formed on the inner peripheral surface 302a, as in the first housing 301. An inner wall portion 302c extends from the two dam portions 302b. The inner wall portion 302c is provided substantially parallel to a contact surface 302d, which is one end surface inside the second housing 302, with a predetermined distance. This distance is equal to the distance between the inner wall portion 301c of the first housing 301 and the contact surface 301d, and is set to be slightly wider than the width of the scraper 203 described above.

  By joining the first housing 301 and the second housing 302, a bottle support member 300 as shown in FIG. 13 is obtained.

  Further, when the first housing 301 and the second housing 302 are joined, as shown in FIG. 15, the first dam portion 301b of the first housing 301 and the second dam portion 302b of the second housing 302, A first space 300c surrounded by the wall 301c and the wall 302c is formed.

  In the present embodiment, the first space 300c is referred to as a toner discharge restriction chamber for restricting toner discharge. On the other hand, the toner from the toner bottle 200 is temporarily discharged from the other space (second space) 300d between the first dam portion 301b and the second dam portion 302b, which is different from the first space, and then discharged. This is called a toner discharge chamber.

  The toner discharge regulation chamber 300c functions not as a space for actually discharging toner but as a space through which the scraper 203 over the first dam portion 301b can pass. In the toner discharge regulation chamber 300c, there is some toner that has passed over the first dam portion 301b together with the scraper 203, but this toner is scraped from the second dam portion 302b side by the rotational movement of the scraper 203. It will be.

  On the other hand, the toner discharge chamber 300d functions as a space for temporarily storing the toner discharged from the bottle-side toner discharge port 201h of the toner bottle 200.

  Here, as shown in FIG. 15, the contact surface 301d of the first dam portion 301b with the scraper 203 is rotated in the rotation direction of the scraper 203 (in the direction of the broken arrow in the figure) so that the scraper 203 can ride on well. It is inclined toward. That is, the contact surface 301 d is inclined from the normal line L from the rotation center O of the toner bottle 200 toward the rotation direction of the scraper 203.

  In other words, the first dam portion 301b is provided on the upstream side in the toner conveyance direction by the scraper 203, and the contact surface 301d of the scraper 203 of the first dam portion 301b is inclined at an angle β from the normal line L from the rotation center O. In this state, the toner discharge chamber 300d is partitioned. This angle β is appropriately set depending on factors such as the material and length of the scraper 203.

  Further, the first dam portion 301b is provided at a position slightly shifted from the toner discharge port 300b in the rotation direction of the scraper 203. This is to make it easier to collect toner in the toner discharge chamber 300d. Thus, by making it easy to store toner in the toner discharge chamber 300d, it is possible to keep the toner supply amount discharged from the toner discharge port 300b constant, and to enable stable supply of toner.

  Similarly to the first dam portion 301b, the second dam portion 302b has a contact surface 302d (surface on the toner discharge regulation chamber 300c side) of the scraper 203 at a predetermined angle β from the normal line L from the rotation center O. The toner discharge chamber 300d is partitioned in an inclined state. This angle β is appropriately set depending on factors such as the material and length of the scraper 203.

  The distance between the first dam portion 301b and the second dam portion 302b, that is, the distance between the toner discharge chambers 300d may be a distance that does not block the toner discharge port 300b. For this purpose, the toner needs to be accumulated in the toner discharge chamber 300d to some extent, so that it may be set as appropriate according to the desired toner accumulation amount.

  Moreover, although the shape of the scraper 203 described above is a plate shape, the shape is not limited to this, and may be, for example, a substantially V-shaped cross section. Since the scraper 203 has a substantially V-shaped cross section in this way, it has a sealing function to seal between the inner peripheral surface of the bottle support member 300 and the toner bottle 200, so that it is necessary to provide a separate sealing member. Disappear.

  In the toner replenishing unit 500 configured as described above, the toner bottle 200 is rotatably supported by the bottle support member 300, so that a slight gap is generated between the toner bottle 200 and the bottle support member 300. . For this reason, unless an appropriate seal is provided between the toner bottle 200 and the bottle support member 300, the toner leaks from other than the toner discharge port 300 b of the bottle support member 300.

  Therefore, in this embodiment, as shown in FIG. 16, two V rings 501 and 502 that function as seals are attached to the front end portion 201 a of the main body portion 201 of the toner bottle 200.

  The V ring 501 is attached to the peripheral surface 201i of the tip portion 201a outside the attachment position of the scraper 203, and the V ring 502 is attached to the end surface 201g of the tip portion 201a inside the attachment position of the scraper 203. ing.

  Further outside the mounting position of the V-ring 501 is a snap formed of a plate-like annular member for ensuring a clearance between the toner bottle 200 and the bottle support member 300 and for smoothly rotating the toner bottle 200. A ring 503 is attached.

  The seal piece 501a of the V ring 501 is pressed against the snap ring 503, and the seal piece 502a of the V ring 502 is pressed against the inner peripheral surface (described later) of the bottle support member 300. The unit 201 is attached. As a result, the two V-rings 501 and 502 function as seals.

  The snap ring 503 is rotatably fitted to the peripheral surface 201 i of the tip portion 201 a of the main body 201 and is fixed to the inner peripheral surface of the bottle support member 300 when the bottle support member 300 is attached to the toner bottle 200. It has come to be.

  As a result, the snap ring 503 is fixed on the bottle support member 300 side, and the main body 201 of the toner bottle 200 rotates on the inner peripheral surface of the snap ring 503.

Here, an example of the snap ring 503 will be described with reference to the drawings.
FIG. 17 is a plan view illustrating an example of the snap ring 503 of the toner bottle 200, and FIG. 18 is a schematic cross-sectional view of the toner bottle 200 with the bottle support member 300 attached to the front end portion thereof.

  As shown in FIG. 17, the snap ring 503 includes a plurality of protrusions 503 a that are in contact with the peripheral surface 201 i serving as a mounting surface at the distal end portion 201 a of the main body 201 at a point, and a line on the peripheral surface 201 e. A substantially arcuate support portion 503c having the same curvature as that of the outer peripheral surface 201i in contact is formed, and a protrusion 503b is formed on the top of the outer peripheral surface. The protrusion 503b is adapted to fit into a notch formed on the inner peripheral surface of the bottle support member 300 (not shown).

  Usually, since the snap ring 503 and the main body 201 of the toner bottle 200 slide, the toner bottle 200 can be smoothly rotated without applying a load to make the frictional force as small as possible.

  Therefore, as shown in FIG. 17, the plurality of protrusions 503 a that contact the peripheral surface 201 i at points are provided on the inner peripheral surface of the snap ring 503, thereby reducing the contact portion between the toner bottle 200 and the snap ring 503. As a result, the frictional force between the snap ring 503 and the main body 201 of the toner bottle 200 can be reduced. As a result, the rotational load can be reduced by increasing the frictional force, and the toner bottle 200 can be smoothly rotated in the snap ring 503.

  Note that the shape of the snap ring 503 is not limited to the shape shown in FIG. 17, and may be a shape that supports the toner bottle 200 at many points, for example, a polygonal shape.

  In other words, on the inner peripheral side of the plate-shaped snap ring 503, a region protruding portion with a predetermined angle on the lower side, which has an arc shape with an outer diameter to which a predetermined clearance generated between the toner bottle 200 and the peripheral surface 201i is added. 503c and other portions of the region protruding portion 503c are formed with a larger curvature, and a protruding portion 503a having a protruding shape is formed at a part of a predetermined large curvature portion.

  As a result, wear is prevented by receiving the lower part under its own weight in an arc shape, and reducing the sliding load by providing support close to a number of points in other parts with protrusions at predetermined intervals or a polygonal shape. Can be achieved.

  Moreover, since the seal piece 501a of the V-ring 501 is in contact with the snap ring 503, it is possible to reliably prevent toner leakage in the downward direction (self-weight direction) in the bottle support member 300.

  As shown in FIG. 18, when the tip 201 a of the main body 201 of the toner bottle 200 is supported by the bottle support member 300, the V ring 502 presses the seal piece 502 a against the inner peripheral surface 300 e of the bottle support member 300. Is attached to the tip 201a. Thereby, leakage of toner from the rear end portion 300f side of the bottle support member 300 can be prevented.

  It should be noted that a sufficient seal is also provided at the joint between the first housing 301 and the second housing 302.

  As described above, all portions of the bottle support member 300 that may cause toner leakage are sealed.

  Further, as shown in FIG. 15, plate-like ribs 210 made of an elastic resin or the like are provided on the peripheral surface of the main body 201 of the toner bottle 200 in an oblique direction in parallel to the bottle support. When the toner bottle 200 is supported by the member 300, the rib 210 is provided so as to come into pressure contact with the inner peripheral surface 300 e of the bottle support member 300. As a result, the toner that has entered the gap between the toner bottle 200 and the bottle support member 300 can be discharged by the rotation of the rib 210.

  The bottle support member 300 is configured by joining two divided housings, a first housing 301 and a second housing 302, and the first housing 301 and the second housing 302 are connected to each other. By detachably joining the seal members (V-rings 501 and 502, consumables) simply by releasing the joining between the first housing 301 and the second housing 302 during maintenance of the toner replenishing device 100, It becomes possible to easily replace the snap ring 503 and the rib 202). That is, it is possible to improve maintainability in the toner replenishing device 100.

  It should be noted that the dimensional accuracy of the bottle support member 300 and the toner bottle 200 is required at the portion where the bottle support member 300 supports the toner bottle 200 so as not to cause toner leakage.

  However, since the toner bottle 200 is formed by blow molding, the dimensions at the time of molding tend to vary. Similarly, since the bottle support member 300 is also formed by blow molding, the dimensions at the time of molding tend to vary.

  In the present embodiment, as described above, the V-ring 502 functions as a seal by pressing the seal piece 502a against the inner peripheral surface 300e of the bottle support member 300. Therefore, the toner bottle 200 and the bottle support member 300 are used. In other words, in the space formed between the surface of the main body 201 of the toner bottle 200 and the bottle support member 300, it is possible to absorb the molding error of the bottle support member 300 or the toner bottle 200.

FIG. 19 is a diagram for explaining the operation of the shutter mechanism 400.
FIG. 19A shows a state where the toner discharge port 300b is opened, and FIG. 19B shows a state where the toner discharge port 300b is closed by the shutter mechanism 400. FIG. 20 is an explanatory view showing a schematic configuration of the back surface of the bottle support member 300.

  As shown in FIGS. 19A and 19B, the shutter mechanism 400 includes a plate-like shutter member 401 that can slide in the arrow F direction and the arrow R direction on the bottom surface of the bottle support member 300. . In the present embodiment, the side from which the opening 300a provided at the tip of the bottle support member 300 or the ribs 202, 202 of the toner bottle 200 protrudes is the front (F) side, and the opposite side is the rear (R) side. And

  In the shutter mechanism 400, as shown in FIG. 19A, when the shutter member 401 slides in the arrow R direction, the toner discharge port 300b of the bottle support member 300 is opened. On the other hand, as shown in FIG. 19B, when the shutter member 401 slides in the direction of the arrow F, the toner discharge port 300b of the bottle support member 300 is closed.

  As illustrated in FIG. 20, the bottle support member 300 is provided with a first guide member 306 and a second guide member 307 for guiding the shutter member 401.

  The first guide member 306 is a substantially flat member substantially parallel to the bottom surface of the bottle support member 300, and an opening 306 a that communicates with the toner discharge port 300 b of the bottle support member 300 is formed. Further, the side end portion 306 b of the first guide member 306 in the direction orthogonal to the arrow F and R directions has a thin shape on the side opposite to the attachment side to the bottle support member 300. This side end portion 306b functions as a guide rail for the shutter member 401.

  Further, the second guide member 307 extends from the mounting position of the first guide member 306 in the direction of the arrow R in the direction of the arrow R, and has two guide plates 307a, 307b. The guide plates 307a and 307b function as guide rails for the shutter member 401.

FIG. 21 is a perspective view illustrating a configuration of the shutter member 401.
FIG. 21A is a perspective view seen from a surface side that does not face the bottle support member 300, and FIG. 21B is a perspective view seen from the surface side that faces the bottle support member 300.

  FIG. 22 is an explanatory diagram showing the relationship between the shutter mechanism 400 and the bottle support member 300. 22A is a diagram viewed from the shutter portion 401a in the direction of the rotation axis of the toner bottle 200, and FIG. 22B is a diagram viewed from the guide portion 401b.

  The shutter member 401 is made of a plate-like resin, and includes a shutter portion 401a on the side that actually covers the opening, and a guide portion 401b that extends to the shutter portion 401a.

  As shown in FIG. 21A, a restriction member 402 for restricting movement of the shutter member 401 is formed in the shutter portion 401a. The restricting member 402 has a substantially L-shaped main body portion 402a whose one end is connected to the side surface of the shutter portion 401a, and a first end portion formed on the opposite end of the main body portion 402a to the side where the shutter portion 401a is connected. It comprises a latching portion 402b and a second latching portion 402c.

  A gap having a predetermined interval is formed between the first hook portion 402b and the second hook portion 402c. This gap is set to such a distance that the tip part comes into contact when the second hooking part 402c falls to the first hooking part 402b side.

  Further, as shown in FIG. 21B, the back surface of the shutter portion 401a is slidably supported by the first guide member 306 in which the toner discharge port 300b of the bottle support member 300 described above is formed. A member 403 is provided in the longitudinal direction of the shutter member 401. That is, as shown to Fig.22 (a), the 1st slide member 403 is supporting the 1st guide member 306 so that sliding is possible by the latching | locking part 403a, 403a provided in both sides.

  Further, as shown in FIG. 21B, a second slide member 404 that is slidably supported with respect to the guide plates 307a and 307b of the second guide member 307 is disposed on the back surface of the guide portion 401b in the longitudinal direction of the shutter member 401. It is provided towards. The second slide member 404 is formed with slide plates 404 a and 404 a that are guided by the guide plates 307 a and 307 b of the second guide member 307.

  A Mylar 405 made of a sponge for sealing the toner discharge port 300b of the bottle support member 300 is formed on the back surface of the shutter portion 401a. The size of the mylar 405 is not particularly limited as long as the size of the Mylar 405 is such that when the shutter portion 401a of the shutter member 401 covers the toner discharge port 300b, the toner discharge port 300b is sealed.

  Further, the slide plates 404a and 404a of the second slide member 404 are shown in FIG. 22 (when the shutter member 401 is moved in the direction of arrow F, that is, when the opening 300a of the bottle support member 300 is closed). As shown in b), a protruding latching portion 205 formed on the surface of the toner bottle 200 enters between the slide plates 404a and 404a to restrict the rotation of the toner bottle 200. Further, if the shutter member 401 moves in the direction of arrow R, the slide plates 404a and 404a also move in the direction of arrow R, and the latched state with the latching portion 205 is released.

  Thereby, the rotation restriction of the toner bottle 200 is released. That is, when the toner discharge port 300b of the bottle support member 300 is opened and the toner supply device 100 performs the toner supply operation, the rotation of the toner bottle 200 is not hindered.

Next, the toner supply unit mounting mechanism 600 will be described with reference to the drawings.
FIG. 23 is an explanatory diagram showing a configuration of a toner replenishing portion mounting mechanism 600 constituting the toner replenishing device 100. FIG. 24 is an explanatory diagram showing the configuration of a replenishment passage body 612 that connects the toner replenishing portion mounting mechanism 600 and the developing device 23.

  As shown in FIGS. 1, 2, 5, and 6, the toner replenishing portion mounting mechanism 600 is configured to dispose the toner replenishing portion 500 so as to face the developing device 23 substantially in parallel with the transfer belt unit 30 interposed therebetween. ing. The toner replenishing portion mounting mechanism 600 can be equipped with two toner replenishing portions 500a for storing black toner.

  In the toner replenishing portion mounting mechanism 600, a mounting base 602 on which the toner replenishing portion 500 is mounted is extended in a direction substantially perpendicular to the transfer belt conveyance direction (transfer belt width direction).

  As shown in FIG. 5, the toner supply unit 500 is fixed to the drive mechanism 701 side on the bottle support member 300 side, and the toner bottle 200 is fixed to the opposite side by a holding belt 702.

  When the toner supply unit 500 is mounted on the mounting base 602, the rib 202 of the toner bottle 200 protruding from the opening 300a of the bottle support member 300 is fitted to the driving mechanism 701 to transmit the rotational driving force. A driving unit (not shown) is provided. The drive unit is usually composed of a motor, and operation is controlled according to the state of supplying toner.

  On the other hand, the holding belt 702 is configured to hold the toner bottle 200 of the toner replenishing unit 500 when the toner replenishing unit 500 is mounted on the mounting base 602, and is detachably provided on the mounting base 602. . When the toner bottle 200 is held, the holding belt 702 has a gap that allows the toner bottle 200 to rotate, or the mounting belt 702 contacts the toner bottle 200 with a frictional force that can rotate. It is attached to 602.

  In the toner replenishing unit mounting mechanism 600, the mounting base 602 on which the toner replenishing unit 500 is mounted, as shown in FIG. 6, has a bottle support on one end side where the bottle supporting member 300 of the toner replenishing unit 500 on the upper surface is mounted. A toner supply port 611 (611a, 611b, 611c, 611d) is formed at a position corresponding to the shutter mechanism 400 provided in the member 300, and the lower side surface of the toner supply port 611 is below the toner supply unit mounting mechanism 600. A toner supply replenishment passage 612 (612a, 612b, 612c, 612d) communicating with the developing device 23 provided is provided.

  In FIG. 6, for convenience of explanation, a part of the mounting base corresponding to the toner replenishing unit 500 a for black toner is omitted.

  The supply passage body 612a provided on the mounting base 602 of the toner supply section 500a for black toner collects toner supplied from the toner supply ports 611 corresponding to the two toner supply sections 500a together. The toner is fed from a toner inlet 234a provided in one black developing device 23a.

  As shown in FIG. 23, the toner replenishing portion mounting mechanism 600 receives toner supplied from the toner replenishing portion 500 through a toner supply port 611 provided outside the transfer belt width W in the direction perpendicular to the transfer belt conveyance direction. It has come to introduce.

  The mounting base 602 includes a casing 610a formed in a box shape long in the transfer belt width direction, and a first toner agitation shaft 610b and a first toner agitation shaft 610b provided in parallel to the axial direction of the developing roller 231 inside the casing 610a. Two toner stirring shafts 610c are arranged in parallel.

  The interior of the housing 610a is divided and formed by a partition body 610d into a first toner chamber 610e in which the first toner stirring shaft 610b is disposed and a second toner chamber 610f in which the second toner stirring shaft 610c is disposed.

  The first and second toner agitation shafts 610b and 610c are respectively provided with screws 610b1 and 610c1 for agitating and conveying the toner, and drive gears 610b2 and 610c2 provided on the other end side 610a2 of the housing 610a. Via a drive motor (not shown).

  The first and second toner agitation shafts 610b and 610c are respectively provided with toner receiving plates 610b3 and 610c3 at downstream ends in the toner conveying direction so as to receive the conveyed toner.

  The toner agitation means is not limited to the screws 610b1 and 610c1, but for example, the first and second toner agitation shafts 610b and 610c are provided with a plurality of agitation plates inclined with respect to the toner conveying direction. There may be other configurations as long as similar effects can be obtained.

  The partition body 610d is formed in the casing 610a along the first toner agitation shaft 610b and the second toner agitation shaft 610c in the width direction of the casing, and the first toner chamber 610e and the first toner chamber 610e are formed near both side walls of the casing 610a. Two toner chamber communication ports 610d1 and 610d2 are formed so as to communicate with the two toner chambers 610f. The toner circulates through the toner chamber communication ports 610d1 and 610d2 from the first toner chamber 610e to the second toner chamber 610f and from the second toner chamber 610f to the first toner chamber 610e.

  In one end side 610a1 of the housing 610a, a toner supply port 611 that introduces toner supplied from the toner bottle 200 disposed above, and a supply passage body 612 that is disposed below and introduces toner into the developing device 23. And a toner supply port 610a4 for supplying toner inside the housing 610a.

  The toner supply port 611 is formed at a position facing a part of the first toner agitation shaft 610b that agitates and conveys toner from one end side 610a1 to the other end side 610a2 of the housing 610a.

  On the other hand, the toner supply port 610a4 is formed at a position facing a part of the second toner agitation shaft 610c that agitates, conveys, and circulates the toner from the other end side 610a2 to the one end side 610a1 of the housing 610a. .

  As shown in FIG. 24, the replenishment passage body 612 has an upper portion provided integrally with the toner replenishing portion mounting mechanism 600, and a lower portion mounted with a developing device detachably attached to the developing device 23. A portion 612a is provided.

  A toner introduction port 612b for introducing toner is formed in the upper portion of the supply passage body 612, and a toner passage 612c through which the toner passes from the toner introduction port 612b to the developing device mounting portion 612a is substantially linear in the vertical direction. It is provided in the shape.

  Further, as shown in FIG. 6, the first fixing member 303 and the second fixing member 304 of the bottle support member 300 are attached to one end of the upper surface of the housing 610 a of the mounting base 602 with the toner replenishing unit 500 mounted. Bottle support member guide portions 620 and 620 that are engaged with and guided by the guide portions 303c and 304c of the first fixing member 303 and the second fixing member 304 are formed to protrude. The bottle support member guide portions 620 and 620 extend along the longitudinal direction of the mounting table 602 substantially in parallel with the toner supply port 611 interposed therebetween.

  The toner supply port 611 of the mounting base 602 is formed at a position corresponding to the shutter member 401 of the shutter mechanism 400 provided in the bottle support member 300 when the toner supply unit 500 is mounted. That is, the toner supply port 611 is formed at a position where the toner discharged from the toner discharge port 300b can be received when the toner discharge port 300b of the bottle support member 300 is opened by the shutter mechanism 400.

  In the vicinity of the toner supply port 611, a protrusion 613 that restricts the movement of the shutter member 401 is formed by a latching portion (described later) of a regulating member 402 provided on the shutter member 401 of the shutter mechanism 400. Yes.

  On the other hand, on the opposite side of the mounting base 602 from the toner supply port 611 in the longitudinal direction, when the toner supply device 100 is mounted, the rear end of the toner bottle 200 (the end opposite to the mounting portion of the bottle support member 300). ) Side support member 614 is formed.

  The support member 614 is for obtaining a predetermined clearance between the toner bottle 200 and the mounting base 602, and smoothes the rotation of the toner bottle 200. The shape or the like of the support member 614 is not particularly limited, and may be any shape and material that can smoothly rotate the toner bottle 200.

  The formation position of the protrusion 613 provided in the vicinity of the toner supply port 611 is determined by the restriction operation of the restriction member 402.

FIG. 25 is a diagram for explaining the movement restriction of the shutter member 401.
FIG. 25A shows the positional relationship between the restricting member 402 and the protrusion 613 before the toner supply device 100 is mounted on the mounting base 602, and FIG. 25B shows the protrusion of the restricting member 4020 when the mounting is completed. FIG. 25C is an explanatory diagram showing the positional relationship between the regulating member 402 and the protruding portion 613 when the toner supply device 100 is detached from the mounting base 612.

  The protrusion 613 engages with the regulating member 402, and when the toner replenishing device 100 is completely mounted on the mounting base 602, the shutter member 401 opens the toner discharge port 300b of the bottle support member 300 to supply the toner. When the apparatus 100 is detached from the mounting base 602, the toner discharge port 300b of the bottle support member 300 is formed in a closed position.

  As described above, the restricting member 402 has the first hook portion 402a and the second hook portion 402c formed at the tip end portion (the end portion on the engagement side with the projection portion 613) of the main body portion 402a.

  The first hooking portion 402a is provided on the tip side from the second hooking portion 402c side, and the contact surface 402d is inclined so that it can easily get over the protruding portion 613 when coming into contact with the protruding portion 613. It is formed to do. Note that the contact surface 402d only needs to be inclined so that the contact area with the top of the protrusion 613 is as small as possible.

  As described above, if the contact surface 402d of the first hooking portion 402a is inclined, the first hooking portion 402b is moved to the first housing by moving the regulating member 402 in the direction of arrow F from the state before the mounting is completed. By overcoming the protrusion 613 formed on 301 and moving in the direction of arrow F, the second hooking portion 402c also gets over the protrusion 613. Thereby, when the restricting member 402 tries to move in the direction opposite to the arrow F direction, the movement of the restricting member 402 is restricted by the protruding portion 613 and the second hooking portion 402c.

Next, attachment of the toner replenishing device 100 to the image forming apparatus 1 will be described.
The toner replenishing device 100 is configured to be mounted on the toner replenishing unit mounting mechanism 600 by sliding the bottle supporting member 300 side of the toner replenishing unit 500 on the mounting base 602 of the toner replenishing unit mounting mechanism 600.

  By the sliding operation of the toner replenishing unit 500, the shutter member 401 of the shutter mechanism 400 provided in the bottle support member 300 opens and closes the toner discharge port 300b of the bottle support member 300 as shown in FIG.

  The movement of the shutter member 401 is restricted by a restriction member 402 formed integrally with the shutter member 401.

  When the toner discharge port 300b of the bottle support member 300 is opened by the shutter mechanism 400, the regulating member 402 further moves from the state shown in FIG. When moving in the R direction, as shown in FIG. 25C, the second hooking portion 402c comes into contact with the protruding portion 613, so that it falls down to the first hooking portion 402b side, and further moves in the arrow R direction. As a result, the first hooking portion 402b gets over the protrusion 613 together with the second hooking portion 402c. Thus, the toner discharge port 300b of the bottle support member 300 is opened.

  When the toner replenishing unit 500 is removed from the toner replenishing unit mounting mechanism 600, the shutter member 401 is moved in the direction of the arrow F by an operation reverse to the above-described operation as the toner replenishing unit 500 is pulled out from the toner replenishing unit mounting mechanism 600. The toner discharge port 300b of the bottle support member 300 is closed by moving.

  Next, a toner supply operation to the developing device 23 by the toner replenishing device 100 will be described.

  When the toner is supplied to the developing device 23, the toner bottle 200 is rotated by driving the driving mechanism 700, so that the toner discharged from the toner bottle 200 is exchanged with the toner bottle 200 as shown in FIGS. The scraper 203 provided integrally is supplied from the inside of the bottle support member 300 to the toner replenishing portion mounting mechanism 600, and the toner is stirred by the toner replenishing portion mounting mechanism 600 and then supplied to the developing device 23.

  When stopping the supply of toner, the rotation of the toner bottle 200 is stopped, and the conveyance of the toner from the toner bottle 200 is stopped. At this time, in the toner bottle 200, the lid 203 b of any one of the plurality of scrapers 203 is opposed to the toner discharge port 300 b of the bottle support member 300 by a rotational position detection sensor of the toner bottle 200 (not shown). The operation is controlled to come to the position.

  Thus, since the toner discharge port 300b of the bottle support member 300 is closed by the lid portion 203b of the scraper 203 in a state where the rotation of the toner bottle 200 is stopped, the toner supply can be completely stopped. Therefore, even if the image forming apparatus 1 is moved or a vibration is applied, the toner is not inadvertently supplied to the developing device 23 from the toner replenishing device 100.

  According to the present embodiment, when the toner conveyed and supplied from the toner bottle 200 is supplied from the bottle support member 300 to the developing device 23 via the toner replenishing unit mounting mechanism 600, the scraper 203 interlocked with the toner bottle 200 causes the toner to be supplied. Since the toner discharge port 300b of the bottle support member 300 can be opened and closed, the toner delivery by the scraper 203 is stopped when the toner bottle 200 stops rotating, and the toner discharge port 300b is closed to ensure the supply of toner. Can be stopped.

  In the present embodiment, the scraper 203 is formed with the lid 203b bent, but the present invention is not limited to the configuration of the toner conveying means, and the lid is formed in a curved state. A part may be formed.

  Further, the scraper 203 is formed of an elastic material such as elastic rubber. However, the present invention is not limited to the material of the toner conveying means. For example, a metallic material having an appropriate elasticity is used. The leaf spring member may be covered with rubber or resin.

  Further, in the present embodiment, the toner conveying unit 206 is configured by uniformly arranging a plurality of bent scrapers 203. However, the present invention is not limited to the configuration of the toner conveying unit. A toner conveying member may be configured by combining a plurality of bent scrapers and a flat scraper.

  In this embodiment, an example in which the toner replenishing device 100 is applied to an image forming apparatus as shown in FIG. 1 has been described. For example, the present invention may be applied to a copying machine 101 as shown in FIG.

  As shown in FIG. 26, the copier 101 has an image reading device (scanner) 110 disposed above an image forming unit 108 having substantially the same configuration as that of the image forming apparatus 1 according to the above-described embodiment. The first paper feed cassette 142a, the second paper feed cassette 142b, the third paper feed cassette 142c, and the fourth paper feed cassette 142d corresponding to a plurality of types of paper are arranged below the 108 to automatically perform a variety of large-volume printing. It is something that is done in. A waste toner box 120 for collecting waste toner is provided adjacent to the paper feed cassette 142.

  In the copying machine 101, components having the same configuration as those of the image forming apparatus 1 according to the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted.

  As in the above-described black toner, toner stored in a plurality of toner bottles can be replenished stably by replenishing as follows.

FIG. 27 is a block diagram illustrating a configuration relating to toner supply in the image forming apparatus 1.
Toner replenishment from the toner replenishing device 100a containing black toner to the developing device 23a, which is a toner replenishment destination, rotates the rotation driving device 2a connected to the toner bottle 200a and rotates the toner bottle 200a to rotate the toner bottle. This is performed by discharging toner from 200a.

  The remaining amount of toner contained in the toner bottle 200a is detected by the bottle remaining amount detector 3a, and the remaining amount of toner in the developing device 23a is detected by the developing device remaining amount detector 4a.

  The control unit 5 controls the operation of the rotation driving device 2a based on the detection results of the bottle remaining amount detector 3a and the developing device remaining amount detector 4a, so that the toner from the toner replenishing device 100a to the developing device 23a is controlled. Control replenishment. The toner bottle 200a for black toner is composed of a first bottle 200a1 and a second bottle 200a2, and the bottle remaining amount detector 3a is also composed of a first remaining amount detector 3a1 and a second remaining amount detector 3a2 according to each bottle. . Furthermore, the rotation drive device 2a also includes a first drive device 2a1 and a second drive device 2a2 according to each bottle.

FIG. 28 is a flowchart showing the toner supply process.
When the remaining amount of toner in the developing device 23a detected by the developing device remaining amount detector 4a falls below a predetermined remaining amount, the rotation driving device 2a is rotated to start discharging the toner from the toner bottle 200a (step S1). .

  At this time, from the detection results of the first remaining amount detector 3a1 and the second remaining amount detector 3a2, the bottle with the smaller remaining amount is selected as the main bottle (step S2), and the rotation driving device 2a is rotated to rotate the toner bottle. The toner discharge from 200a is started (step S3).

In toner replenishment in a state where the remaining amount of one main bottle, for example, the first bottle 200a1, is reduced, the toner replenishment amount per unit time is reduced and stable toner replenishment cannot be performed. In such a state, the developing device 23a may not become full even if toner is supplied for a predetermined time (for example, 10 seconds).
If the developing device 23a does not become full even after toner supply for a predetermined time (steps S4 and S5), an amount equal to the amount of toner discharged from the developing device 23a for a predetermined time is supplied from the first bottle 200a1 to the developing device 23a. The first drive device 2a1 is rotated for a time that can be replenished (step S6). The time for rotating the first driving device 2a1 is calculated from the toner amount per unit time discharged from the developing device 23a and the toner amount replenished from the first bottle 200a1.

  If the developing device 23a is not yet full (step S7), the second driving device 2a2 is operated to simultaneously discharge toner from the second bottle 200a2 (step S8).

  The toner supply operation from the two bottles is stopped when the developing device 23a becomes full due to the discharge of toner from the two bottles or when the toner supply is performed for a predetermined time thereafter (step S9).

  Thereafter, when the remaining amount of the developing device 23a decreases again (returning to step S1), a bottle with a small amount of toner remaining is selected as a main bottle, and toner is discharged.

  The number of times the toner supply operation is simultaneously performed from the first bottle 200a1 and the second bottle 200a2 is counted, and it is determined that the main bottle has been emptied when the predetermined number of times is performed. At this time, image formation can be performed without interrupting the toner supply operation by switching the main bottle to the other bottle.

  The determination that the main bottle is empty is not performed as described above, but is performed for a predetermined time by measuring the time for performing the toner replenishment operation simultaneously from the first bottle 200a1 and the second bottle 200a2. It may be determined that the main bottle is empty. The predetermined time is, for example, 40 minutes and 2400 revolutions at 60 rpm.

In any case, it can be easily determined that the main bottle is empty.
Such a toner supply operation using a plurality of toner bottles can be applied to the following cases.

  A printing rate is set as information related to image formation from setting means such as a setting panel (not shown). When the high printing rate condition is set (for example, when the printing rate is 75% or more), even if the remaining amount of toner in the first bottle 200a1 is sufficient, the supply amount cannot follow the discharge amount of the developing device 23a. The developing device 23a may not become full for a predetermined time. In such a case, the first driving device 2a1 is rotated for a time during which the toner amount discharged from the developing device 23a for a predetermined time can be supplied from the first bottle 200a1 to the developing device 23a. The time for rotating the first driving device 2a1 is calculated from the toner amount per unit time discharged from the developing device 23a and the toner amount replenished from the first bottle 200a1.

  When the developing device 23a is not yet full, the second driving device 2a2 is operated to simultaneously discharge toner from the second bottle 200a2.

  The toner supply operation from the two bottles is stopped when the developing device 23a becomes full due to the discharge of toner from the two bottles or when the toner supply is performed for a predetermined time thereafter.

1 is a schematic cross-sectional view illustrating a configuration of an image forming apparatus 1 including a developing device 23 according to an embodiment of the present invention. FIG. 2 is a schematic side cross-sectional view illustrating a configuration of a developing device and a toner replenishing device that constitute the image forming apparatus. 2 is a front view showing the configuration of a developing device 23 and a toner replenishing device 100. FIG. 3 is a perspective view of the developing device 23. FIG. 4 is a perspective view illustrating an example of mounting when a toner supply unit is mounted on a toner supply unit mounting mechanism constituting the toner supply device 100. FIG. FIG. 11 is a perspective view of a toner replenishing unit mounting mechanism 600. 2 is an external view showing a configuration of a toner supply unit 500 that constitutes the toner supply device 100. FIG. 4 is an enlarged view showing a front end portion of a toner bottle 200 that constitutes a toner replenishing unit 500. FIG. 4 is an enlarged view showing a configuration in which a toner transporting scraper 203 is attached to the tip of a toner bottle 200. FIG. 3 is a schematic view showing the shape of a scraper 203. FIG. 3 is a schematic view when a scraper 203 is attached to a toner bottle 200. FIG. FIG. 3 is a front view of a toner bottle 200 with a scraper 203 attached. 4 is a perspective view showing a configuration of a bottle support member 300 that constitutes the toner supply device 100. FIG. FIG. 4 is an external view showing the shape of housings 301 and 302 that constitute a bottle support member 300. FIG. 6 is a diagram illustrating a relationship between a toner discharge chamber of a bottle support member 300 and an arrangement position of a scraper 203 of a toner bottle. FIG. 3 is a schematic cross-sectional view illustrating a configuration of a front end portion of a toner bottle. 4 is a plan view illustrating an example of a snap ring 503 of the toner bottle 200. FIG. FIG. 3 is a schematic cross-sectional view of a state where a bottle support member 300 is attached to the front end portion of the toner bottle 200. FIG. 6 is a diagram for explaining the operation of a shutter mechanism 400. FIG. 6 is an explanatory diagram showing a schematic configuration of the back surface of the bottle support member 300.

FIG. 3 is a perspective view illustrating a configuration of a shutter member 401. FIG. 6 is an explanatory diagram showing a relationship between a shutter mechanism and a bottle support member. 4 is an explanatory diagram showing a configuration of a toner supply unit mounting mechanism 600 that constitutes the toner supply device 100. FIG. 6 is an explanatory diagram showing a configuration of a supply passage body 612 that connects a toner supply unit mounting mechanism 600 and a developing device 23; It is a figure explaining the movement control of the shutter member. It is a schematic sectional drawing which shows the structure of the image forming apparatus 1 provided with the developing device 23 which is other form of implementation of this invention. 2 is a block diagram illustrating a configuration related to toner supply in the image forming apparatus 1. FIG. 6 is a flowchart illustrating toner supply processing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Image forming apparatus 2 Rotation drive device 3 Bottle remaining amount detector 4 Developing device remaining amount detector 5 Control unit 23, 23a, 23b, 23c, 23d Developing device 101 Copier 100, 100a, 100b, 100c, 100d Toner replenishing device 200 Toner bottle (toner container)
200a Toner supply port 203, 223a, 223b Scraper 203a Toner transport part 203b Cover part 204, 224 Fixing member 204a, 224a Protrusion part 205 Locking part 206, 226 Toner transport means 300 Bottle support member 300b Toner discharge port 400 Shutter mechanism 500, 500a, 500b, 500c, 500d Toner supply unit 600 Toner supply unit mounting mechanism (toner supply device)
602 Mounting base 612 Supply passage body

Claims (6)

Comprising a developing device, a plurality of toner bottles containing toner, from the toner bottle to the developing device, and a supply device toner bottle according to the amount of remaining toner in the developing device for supplying toner by rotating the developing device In an image forming apparatus for forming an image by an electrophotographic method based on the toner image developed by
Setting means for setting a printing rate as information relating to image formation;
Judging means for judging whether the printing rate is 75% or more,
The replenishing device is
A bottle remaining amount detector for detecting the remaining amount of toner contained in the toner bottle;
When the toner from the developing device is discharged, a developing device remaining amount detecting device for detecting the remaining amount of toner in the developing device,
A detecting means for detecting a decrease in a toner replenishment amount per unit time of a main bottle which is a toner bottle replenishing toner to the developing device , and supplying toner from the main bottle to the developing device for a predetermined reference time. Detecting that the toner replenishment amount per unit time of the main bottle has decreased when the remaining toner amount of the developing device detected by the developing device remaining amount detector does not exceed a predetermined remaining amount Means,
When the toner is replenished from only the main bottle to the developing device in accordance with the remaining amount of toner in the developing device , the detection means detects that the amount of toner replenished per unit time of the main bottle has decreased. Then, the main bottle is rotated for a time during which the main bottle can be replenished to the developing device by an amount equal to the amount of toner discharged from the developing device at the predetermined reference time, and toner is supplied from the main bottle to the developing device. A controller that controls the toner to be supplied from another toner bottle different from the main bottle to the developing device ;
When the control unit determines that the printing rate set as information relating to image formation is 75% or more by the determination unit when toner is supplied from only the main bottle to the developing device, Even if it is not detected by the detection means that the toner replenishment amount per unit time of the main bottle has decreased, the amount of toner discharged from the developing device is the same as the amount of toner discharged from the developing device at the predetermined reference time. The main bottle is rotated for a time during which the amount can be replenished from the main bottle to the developing device, and toner is replenished from the main bottle to the developing device, and then from another toner bottle different from the main bottle to the developing device. An image forming apparatus controlled to replenish toner. The image forming apparatus according to claim 1, wherein the control unit selects a toner bottle having the smallest amount of toner among a plurality of toner bottles as a main bottle. When the developing device remaining amount detector detects that the remaining amount of toner in the developing device exceeds a predetermined remaining amount, or the developing device remaining amount detector determines the remaining amount of toner in the developing device. 2. The image forming apparatus according to claim 1, wherein the toner supply from the toner bottle to the developing device is stopped after replenishment for a predetermined time after it is detected that the remaining amount is exceeded . The control unit counts the time when toner is replenished by a plurality of toner bottles, and determines that the main bottle has been emptied when the measured time exceeds a predetermined time. The image forming apparatus according to claim 1. The controller counts the number of times toner is replenished by a plurality of toner bottles, and determines that the main bottle is empty when the counted number exceeds a predetermined number. The image forming apparatus according to claim 1. 5. The control unit according to claim 4, wherein when the main bottle is determined to be empty, a toner bottle having a least amount of toner among toner bottles different from the main bottle is selected as a new main bottle. 5. The image forming apparatus according to 5.

Images