JP4623225B2 - Image forming apparatus - Google Patents

Description

  The present invention relates to an image forming apparatus.

  Conventionally, as this type of image forming apparatus, toner images of respective colors formed by four image forming units of yellow (Y), magenta (M), cyan (C), and black (K) are used. After multiple transfer onto the intermediate transfer belt disposed above the forming portion, the toner images transferred onto the intermediate transfer belt are secondarily transferred onto a recording medium and fixed. Some are configured to form full-color images. Further, in such an image forming apparatus, a cleaning device that cleans the surface of the intermediate transfer belt after the transfer process is completed is disposed at one end of the intermediate transfer belt in the circumferential direction.

  Incidentally, the image forming apparatus configured as described above includes an intermediate transfer belt unit that rotatably holds the intermediate transfer belt. The intermediate transfer belt unit is attached to the apparatus main body for maintenance of the image forming apparatus. It is configured to be detachable. In addition, an intermediate transfer belt cleaning device is detachable from the image forming apparatus main body.

  In that case, the image forming apparatus is configured to attach / detach the intermediate transfer belt unit together with the cleaning device in the direction of one side of the apparatus main body, or the intermediate transfer belt unit together with the cleaning apparatus on the front surface of the apparatus main body. It is configured to be attached and detached.

  By the way, in the image forming apparatus, in order to reduce the size of the apparatus, it is conceivable to arrange the intermediate transfer belt in an inclined state with respect to the apparatus body and to set the installation width of the intermediate transfer belt small.

  However, in the case of the above prior art, if an intermediate transfer belt disposed in an inclined state with respect to the apparatus main body is configured to be detachable in the direction of one side surface of the apparatus main body, the intermediate transfer belt is attached / detached. When the intermediate transfer belt unit disposed in an inclined state with respect to the apparatus main body is used, the sheet feeding mechanism disposed on one side of the apparatus main body or the power supply circuit disposed on the other side of the apparatus main body In order to attach and detach the intermediate transfer belt unit due to interference with the members, it is necessary to temporarily remove the paper feed mechanism, the power supply circuit, and the like, and there is a technical problem that maintenance becomes very complicated.

  In the case of the above prior art, if an intermediate transfer belt unit disposed in an inclined state with respect to the apparatus main body is detachably configured on the front side of the apparatus main body, the intermediate transfer belt unit can be attached or detached. Therefore, the front surface of the apparatus main body has to be opened largely, which has another technical problem that it is difficult to ensure the rigidity of the apparatus main body frame.

  Therefore, in order to solve such technical problems, for example, those disclosed in Japanese Patent No. 3783908, Japanese Patent Application Laid-Open No. 2004-53819, Japanese Patent Application Laid-Open No. 10-26922, and the like have already been proposed.

The image forming apparatus according to Japanese Patent No. 3783908 is an image forming apparatus in which a transfer unit for transferring a toner image carried on an image carrier is configured to be detachable from the apparatus main body.
In the transfer unit, a guide pin protruding from the transfer unit is guided by a guide rail provided in the apparatus main body, and is inserted and removed in a direction perpendicular to the rotation axis of the image carrier.
When the transfer unit is attached to or detached from the apparatus main body, the guide rail and the guide pin are separated from the surface of the image carrier, and the transfer belt of the transfer unit is separated from the surface of the image carrier except for the normal attachment position of the transfer unit. Then, it has a shape that can fix the transfer unit only with a pressing force in one direction to the transfer unit,
The apparatus main body includes a plurality of image carriers, the transfer belt of the transfer unit is supported by a plurality of transfer belt rollers, and at least two pairs of guide pins are provided apart in the direction of inserting / removing the transfer unit,
In the normal mounting state of the transfer unit, one pair of the guide pins is located between the endmost image carrier of the image carriers and the transfer belt roller closest thereto, and the other of the guide pins The pair is configured to be positioned between the image carrier opposite to the image carrier and the transfer belt roller closest thereto.

Further, in the image forming apparatus according to the above Japanese Patent Application Laid-Open No. 2004-53819, the toner image formed on the image carrier is transferred by the belt-like transfer member having a transfer surface that can be contacted and separated from the image carrier. A transfer means for transferring to either a transfer surface or a transfer medium sandwiched between the belt-like transfer body and the image carrier, and when the transfer means is in a separated state from the image carrier, An image forming apparatus comprising: a guide unit that guides a transfer unit in a guide direction substantially parallel to the transfer surface so that the transfer unit can be inserted and removed in a conveyance direction of the belt-shaped transfer body.
At least two guided portions provided on the upstream side and the downstream side in the insertion direction of the transfer unit and guided by the guide unit;
The first guiding means is configured to guide any one of the at least two guided portions and position at least a direction perpendicular to the guiding direction of the one guided portion. A second guide member that guides any other guided portion and positions the vertical direction and the guide direction of the other guided portion;
When any one of the other guided parts is moved in an oblique direction with respect to the moving direction of the transfer means and at least the vertical direction of the one guided part is positioned, substantially any one of the other And a pressing unit that positions the vertical direction and the guiding direction of the guided portion and can switch the transfer unit between a state in contact with the image carrier and a separated state. .

  Further, the opening / closing mechanism according to the above-mentioned Japanese Patent Application Laid-Open No. 10-26922 is provided on the side surface of the image forming apparatus main body, and a discharge portion cover that opens and closes a discharge conveyance path in the image forming apparatus can be rotated about a horizontal axis. The opening / closing mechanism of the discharge portion cover supported by the opening portion includes an opening angle setting means for setting the opening angle of the discharge portion cover in multiple stages.

Japanese Patent No. 3783908 JP 2004-53819 A JP-A-10-26922

  By the way, the problem to be solved by the present invention is to form an image that can reduce the size of the apparatus, improve the maintainability and operability of the intermediate transfer belt unit, and ensure the rigidity of the apparatus main body frame. To provide an apparatus.

That is, the invention described in claim 1 includes a plurality of image forming units that form toner images of different colors,
A belt-like intermediate transfer member that is disposed in an inclined state with respect to a horizontal direction over the plurality of image forming units and onto which toner images formed by the plurality of image forming units are transferred;
An intermediate transfer body unit that detachably holds the belt-shaped intermediate transfer body from the side of the apparatus body; and
A member that removably guides the intermediate transfer unit in the direction of one side surface of the apparatus main body, and the direction in which the intermediate transfer unit is guided changes midway so that the downstream side in the mounting direction is positioned upward. A guide rail member set to
The intermediate transfer belt provided on the back side of the apparatus main body along the attaching / detaching direction of the intermediate transfer member unit so as to be exposed toward the intermediate transfer member unit along the attaching / detaching direction of the intermediate transfer member unit. A plurality of power feeding sections for feeding power to
A plurality of electrodes provided corresponding to the power supply unit on the apparatus main body side so as to be exposed toward the power supply unit on the apparatus main body side on the intermediate transfer body unit ;
The plurality of electrodes are formed in a spring shape,
The guide rail member that mates with the intermediate transfer body unit includes a power supply unit disposed on the most upstream side in the mounting direction of the intermediate transfer unit when the intermediate transfer body unit is mounted on the apparatus main body. After the electrode arranged on the most downstream side in the mounting direction of the intermediate transfer unit comes into contact, the power feeding unit arranged on the most downstream side in the mounting direction of the intermediate transfer unit and the mounting direction of the intermediate transfer unit most. An image forming apparatus that guides the intermediate transfer unit so that an inclination angle of a portion that guides the intermediate transfer unit does not change until an electrode disposed on a downstream side contacts with the electrode. .

According to the present invention , while achieving downsizing of the apparatus, the intermediate transfer belt unit can be easily attached and detached from the side of the apparatus main body, improving the maintainability and operability of the intermediate transfer belt unit, In addition, the rigidity of the apparatus main body frame can be ensured.

Further, according to the present invention, it is possible to reliably supply power to the plurality of transfer members provided in the intermediate transfer belt unit.

FIG. 1 is an external perspective view showing a tandem full-color multifunction peripheral as an image forming apparatus according to Embodiment 1 of the present invention. FIG. 2 is an overall configuration diagram showing a tandem type full-color multifunction peripheral as an image forming apparatus according to Embodiment 1 of the present invention. FIG. 3 is a block diagram showing an image forming unit of a tandem type full-color multifunction peripheral as an image forming apparatus according to Embodiment 1 of the present invention. FIG. 4 is an enlarged configuration diagram showing an image forming unit of a tandem type full-color multifunction peripheral as an image forming apparatus according to Embodiment 1 of the present invention. FIG. 5 is a configuration diagram showing a stretched state of the intermediate transfer belt. FIG. 6 is a configuration diagram showing a mechanism for retracting the intermediate transfer belt. FIG. 7 is a perspective configuration diagram showing an attachment / detachment mechanism of the intermediate transfer body unit. FIG. 8 is a side configuration diagram showing an attaching / detaching mechanism of the intermediate transfer body unit. FIG. 9 is an external perspective view showing a tandem type full-color multifunction peripheral as an image forming apparatus according to Embodiment 1 of the present invention. FIG. 10 is a configuration diagram showing an open / closed state of the side cover. FIG. 11 is a configuration diagram showing an open / closed state of the side cover. FIG. 12 is a perspective view showing a tandem type full-color multifunction peripheral as an image forming apparatus according to Embodiment 1 of the present invention. FIG. 13 is a block diagram showing the operation of attaching / detaching the intermediate transfer body unit. FIG. 14 is a configuration diagram showing an operation of attaching and detaching the intermediate transfer body unit.

  Embodiments of the present invention will be described below with reference to the drawings.

Embodiment 1
FIG. 2 shows a tandem type digital color multifunction peripheral as an image forming apparatus according to Embodiment 1 of the present invention. This tandem type digital color multifunction peripheral is provided with an image reading device, but may of course be configured as a printer or the like not provided with an image reading device.

  In FIG. 2, reference numeral 1 denotes a main body of a tandem type digital color multifunction peripheral, and an automatic document feeder that automatically conveys documents 2 one by one in a separated state above the multifunction peripheral body 1. 3 and a document reading device 4 for reading an image of the document 2 conveyed by the automatic document conveying device 3. The document reader 4 illuminates a document 2 placed on a platen glass 5 with a light source 6, and reflects a reflected light image from the document 2 from a full-rate mirror 7, half-rate mirrors 8 and 9, and an imaging lens 10. By scanning and exposing the image reading element 11 made of a CCD or the like through the reduction optical system, the reflected light image of the document 2 is read by the image reading element 11 at a predetermined dot density (for example, 16 dots / mm). It is like that.

  The reflected light image of the document 2 read by the document reading device 4 is, for example, image processing device 12 as document reflectance data of three colors of red (R), green (G), and blue (B) (each 8 bits). The image processing apparatus 12 performs predetermined image processing such as shading correction, position shift correction, brightness / color space conversion, gamma correction, frame deletion, color / moving editing, etc., on the reflectance data of the document 2. Is given. The image processing device 12 is also configured to perform predetermined image processing on image data sent from a personal computer (not shown) or the like.

  The image data that has been subjected to the predetermined image processing by the image processing device 12 as described above is similarly processed by the image processing device 12 to yellow (Y), magenta (M), cyan (C), black (K) (each 8-bit) gradation data of four colors, and as described below, yellow (Y), magenta (M), cyan (C), and black (K) image forming units 13Y, 13M, and 13C. The image exposure device 14 performs image exposure with light emitted from the LED light emitting element array in accordance with the gradation data of the document 2 of a predetermined color.

By the way, in this embodiment, a plurality of image forming units that form toner images of different colors,
A belt-like intermediate transfer member that is disposed in an inclined state with respect to the horizontal direction over the plurality of image forming units and onto which the toner images formed by the plurality of image forming units are transferred. ing.

  As shown in FIG. 2, the tandem type digital color MFP main body 1 has four image forming units (image forming units) of yellow (Y), magenta (M), cyan (C), and black (K). Part) 13Y, 13M, 13C, and 13K are horizontal with respect to the horizontal direction so that the yellow (Y) image forming unit 13Y of the first color is high and the black (K) image forming unit 13K of the final color is low. They are arranged in parallel at a predetermined interval in a state where they are inclined obliquely by a predetermined angle.

  In this way, the four image forming units 13Y, 13M, 13C, and 13K of yellow (Y), magenta (M), cyan (C), and black (K) are arranged in a state where they are inclined at a predetermined angle. As a result, compared to the case where these four image forming units 13Y, 13M, 13C, and 13K are horizontally arranged, the distance in the width direction can be set short, and the width of the apparatus main body 1 can be reduced to reduce the size. Is possible.

  These four image forming units 13Y, 13M, 13C, and 13K are basically configured in the same manner. As shown in FIGS. 2 and 3, the image forming units 13Y, 13M, 13C, and 13K are roughly divided by a driving unit (not shown) at a predetermined speed. A photosensitive drum 15 as an image carrier to be driven, a charging roll 16 for primary charging that uniformly charges the surface of the photosensitive drum 15, and a surface corresponding to a predetermined color on the surface of the photosensitive drum 15. An image exposure device 14 comprising an LED print head for exposing an image to form an electrostatic latent image; a developing unit 17 for developing the electrostatic latent image formed on the photosensitive drum 15 with toner of a predetermined color; The cleaning device 18 is configured to clean the surface of the photosensitive drum 15.

  As the photosensitive drum 15, for example, an organic photosensitive member formed in a drum shape with a diameter of 30 mm and having an overcoat layer on its surface is used, and is rotated at a predetermined rotational speed by a drive motor (not shown). .

  In addition, as the charging roll 16, for example, a roll-shaped charger in which a conductive layer made of synthetic resin or rubber and having an adjusted electric resistance is coated on the surface of the core metal is used. A device to which a predetermined charging bias is applied is used. Further, a cleaning roll 16 a for removing foreign matters such as toner adhering to the surface of the charging roll 16 is disposed on the surface of the charging roll 16.

  As shown in FIG. 2, the image exposure device 14 is individually arranged for each of the four image forming units 13Y, 13M, 13C, and 13K, and is provided in each of the image forming units 13Y, 13M, 13C, and 13K. As the image exposure device 14, an LED light emitting element array in which LED light emitting elements are linearly arranged at a predetermined pitch (for example, 600 dpi), and light emitted from each LED light emitting element of the LED light emitting element array are photosensitive members. A lens provided with a Selfoc lens (trade name) array that forms an image in a spot shape on a drum is used. Further, as shown in FIG. 2, the image exposure device 14 is configured to scan and expose an image on the photosensitive drum 15 from below.

  From the image processing apparatus 12, image exposure apparatuses 14Y provided individually in the image forming units 13Y, 13M, 13C, and 13K for each color of yellow (Y), magenta (M), cyan (C), and black (K). , 14M, 14C, and 14K, image data of each color is sequentially output, and light beams emitted according to the image data from these image exposure devices 14Y, 14M, 14C, and 14K are applied to the surface of the corresponding photosensitive drum 15. Scanning exposure is performed to form an electrostatic latent image. The electrostatic latent images formed on the photosensitive drum 15 are respectively developed in yellow (Y), magenta (M), cyan (C), and black (K) colors by developing units 17Y, 17M, 17C, and 17K. Developed as a toner image.

  The yellow (Y), magenta (M), cyan (C), and black (K) toner images sequentially formed on the photosensitive drums 15 of the image forming units 13Y, 13M, 13C, and 13K are as follows. On the intermediate transfer belt 20 as a belt-like intermediate transfer member disposed in an inclined state over the image forming units 13Y, 13M, 13C, and 13K, the images are transferred in multiple by the primary transfer roll 21.

  The intermediate transfer belt 20 is a belt-like member stretched by a plurality of rolls, and the lower side running area of the belt-like member is low on the downstream side along the running direction and high on the upstream side. It is arranged in an inclined state with respect to the horizontal direction.

  That is, the intermediate transfer belt 20 is fixed between a drive roll 22, a backup roll 23, a tension roll 24, a first idler roll 25, and a second idler roll 26 as shown in FIG. And is driven to circulate at a predetermined speed in the direction of an arrow by a drive roll 22 that is rotated by a dedicated drive motor with excellent constant speed (not shown). As the intermediate transfer belt 20, for example, a flexible synthetic resin film such as PET is formed in a strip shape, and both ends of the synthetic resin film formed in a strip shape are connected by means such as welding, thereby being endless. A belt-shaped one is used. The intermediate transfer belt 20 is arranged in contact with the photosensitive drums 15Y, 15M, 15C, and 15K of the image forming units 13Y, 13M, 13C, and 13K in the lower side running region.

  Further, as shown in FIGS. 4 and 5, the intermediate transfer belt 20 is disposed at the lower end of the intermediate transfer belt 20 that is disposed at an angle θ with respect to the horizontal direction H. A secondary transfer roll 27 as a secondary transfer means for secondary transfer of the toner image primarily transferred onto the intermediate transfer belt 20 onto the recording medium is applied to the surface of the intermediate transfer belt 20 stretched by the backup roll 23. It is arranged to touch.

  The yellow (Y), magenta (M), cyan (C), and black (K) toner images transferred onto the intermediate transfer belt 20 in a multiple manner are transferred to the backup roll 23 by a secondary transfer roll 27. The recording paper 28 that has been secondarily transferred onto the recording paper 28 as a recording medium by the pressure contact force and the electrostatic force and onto which the toner images of these colors are transferred is conveyed to a fixing device 29 positioned above. The secondary transfer roll 27 is in pressure contact with the side of the backup roll 23, and secondary-transfers each color toner image onto a recording paper 28 that is conveyed upward from below in the vertical direction. . The recording paper 28 onto which the toner images of the respective colors have been transferred is subjected to a fixing process by heat and pressure by a fixing device 29, and then first discharged through an outlet roll 30 and a paper discharging path 31 of the fixing device 29. It is discharged onto a first discharge tray 33 provided on the upper part of the main body 1 by a roll 32 or discharged onto a second discharge tray 35 provided above the main body 1 by a second discharge roll 34. Alternatively, the sheet is discharged onto a third face-up tray 37 provided on the side of the main body 1 by the third discharge roll 36.

  As shown in FIG. 2, the recording paper 28 is a paper feed tray 40 as a recording medium container disposed inside the multi-function device main body 1 or a paper feed tray 41 disposed below the multi-function device main body 1. To 43 of a predetermined size are once transported to the registration roll 48 via the transport roll 49 and the paper transport path 47 by the paper feed roller 44 and the pair of rollers 45 and 46 for paper separation and transport, and stopped. The recording paper 28 supplied from any of the paper feed trays 40 to 43 is sent to the secondary transfer position of the intermediate transfer belt 20 by a registration roll 48 that rotates at a predetermined timing.

  In the above digital color printer and copying machine, when full-color double-sided copying is performed, the recording paper 28 with the image fixed on one side is directly placed on the second discharge tray 35 by the second discharge roll 34. Without discharging, while the rear end of the recording paper 28 is nipped by the reversing roll 32a, the conveying direction is switched by the switching gate 32b and conveyed to the duplex conveying unit 50. In the double-sided conveyance unit 50, the recording paper 28 is conveyed to the registration roll 48 again with the front and back sides of the recording paper 28 reversed by the conveyance roller pairs 52 to 54 provided along the conveyance path 51. This time, after the image is transferred and fixed on the back surface of the recording paper 28, the image is discharged onto the first discharge tray 33 to the third discharge tray 37.

In FIG. 2, 55Y, 55M, 55C, and 55K are toner cartridges that supply toner of a predetermined color to the developing device 17 of each color of yellow (Y), magenta (M), cyan (C), and black (K). Since the toner cartridge containing black (K) toner is used frequently, it is formed in a larger size than other color toner cartridges.
In FIG. 2, reference numeral 56 denotes a manual feed tray from which a desired material and a recording medium 28 of a predetermined size are fed from a paper feed roller 57 and a pair of paper separating and conveying rollers 58. 59 is conveyed to the registration roll 48 via the conveyance roll 60.

  FIG. 3 shows each image forming unit of the digital color printer and the copying machine.

  The four image forming units 13Y, 13M, 13C, and 13K of yellow, magenta, cyan, and black are all configured similarly as shown in FIG. 3, and these four image forming units 13Y. , 13M, 13C, and 13K, as described above, yellow, magenta, cyan, and black toner images are sequentially formed at predetermined timings. As described above, the image forming units 13Y, 13M, 13C, and 13K for the respective colors are provided with the photosensitive drums 15, and the surfaces of these photosensitive drums 15 are uniformly formed by the charging rolls 16 for primary charging. Charged. Thereafter, the surface of the photosensitive drum 15 is scanned and exposed with a light beam emitted from the image exposure device 14 according to the image data, and an electrostatic latent image corresponding to each color is formed. The light beam scanned and exposed on the photosensitive drum 15 is set so as to be exposed at a predetermined inclination angle from an obliquely lower side slightly to the right of the photosensitive drum 15. The electrostatic latent image formed on the photosensitive drum 15 is converted into yellow, magenta, cyan, and black colors by the developing roll 17a of the developing unit 17 of each image forming unit 13Y, 13M, 13C, and 13K. The toner is developed into visible toner images, and these visible toner images are sequentially transferred in multiple onto the intermediate transfer belt 20 by charging of the primary transfer roll 21.

  Each of the developing devices 17Y, 17M, 17C, and 17K employs a two-component development method using a two-component developer composed of toner and carrier, and two-component development composed of toner and carrier on the surface of the developing roll 17a. An electrostatic latent image formed on the surface of the corresponding photosensitive drum 15Y, 15M, 15C, 15K is developed by forming a magnetic brush of the agent.

  Residual toner, paper dust, and the like are removed from the surface of the photosensitive drum 15 after the toner image transfer process by the cleaning device 18 to prepare for the next image forming process. The cleaning device 18 includes a cleaning blade 61, and the cleaning blade 61 removes waste toner, paper dust, and the like on the photosensitive drum 15. Waste toner or the like removed by the cleaning blade 61 is transported to the front side of the copying machine main body 1 at a predetermined timing by a transport auger 62 provided in the cleaning device 18, and a transport pipe (not shown). Then, the toner is conveyed to a waste toner collecting container which will be described later.

  Further, as shown in FIG. 2, the surface of the intermediate transfer belt 20 after the toner image transfer process is finished, after the secondary transfer, residual toner and paper dust are removed by the cleaning device 63, and the next image is transferred. Prepare for the formation process. As shown in FIG. 3, the cleaning device 63 includes a cleaning blade 64. The cleaning blade 64 removes residual toner, paper dust, and the like on the intermediate transfer belt 20. Waste toner or the like removed by the cleaning blade 64 is conveyed to the front side of the copying machine main body 1 at a predetermined timing by a conveyance auger 65 provided in the cleaning device 63, and a conveyance pipe (not shown). Then, the toner is conveyed to a waste toner collecting container which will be described later.

  By the way, in this embodiment, an intermediate transfer body unit that detachably holds the belt-like intermediate transfer body with respect to the apparatus main body, and the intermediate transfer body unit is detachably guided in the direction of one side surface of the apparatus main body. And a guide rail member set so that the direction in which the intermediate transfer unit is guided changes midway.

  That is, in this embodiment, as shown in FIG. 3, the intermediate transfer belt 20 includes a drive roll 22, a backup roll 23, a tension roll 24, a first idler roll 25, The intermediate transfer unit 80 is integrated with the idler roll 26 of the second unit, and the intermediate transfer unit 80 is detachable from one side surface (the left side surface in the illustrated example) of the multifunction machine main body 1. Yes.

  As shown in FIG. 6, the intermediate transfer body unit 80 rotates the retract handle 81 provided in the intermediate transfer body unit 80 to rotate the first idler roll 25 and the second idler roll 26. The intermediate transfer belt 20 is separated from the photosensitive drums 15 of the image forming units 13Y, 13M, 13C, and 13K by retracting the primary transfer rolls 21Y, 21M, 21C, and 21K upward.

  More specifically, a retract handle 81 is rotatably attached to the intermediate transfer body unit 80 as shown in FIG. 6B, and the first idler roll 25 is attached to the retract handle 81. The second idler roll 26 and the primary transfer rolls 21Y, 21M, 21C, and 21K are rotatably connected to a holding frame 82 via a link mechanism (not shown), and the retract handle 81 is rotated. As a result, the holding frame 82 moves in a direction perpendicular to the traveling direction of the intermediate transfer belt 20, and the intermediate transfer belt 20 is separated from the photosensitive drums 15 of the image forming units 13Y, 13M, 13C, and 13K. Is possible.

  Here, as shown in FIG. 9, the retract handle 81 is connected to the intermediate transfer unit 80 through the front frame 96 and a front guide rail (not shown) with the front cover 95 opened. If the transfer belt 20 is not separated from the photoconductive drums 15 of the image forming units 13Y, 13M, 13C, and 13K, the stopper mechanism is such that the retract handle 81 cannot be removed from the intermediate transfer unit 80.

  Further, as shown in FIG. 7, the digital color multifunction peripheral body 1 is a member that removably guides the intermediate transfer body unit 80 in the direction of one side surface of the apparatus body 1, and the intermediate transfer body. Guide rail members 83 and 84 set so that the direction in which the unit 80 is guided are changed in the middle are attached. The guide rail members 83 and 84 are provided on the front side and the rear part in the multifunction machine main body 1, respectively.

  As shown in FIG. 8, the guide rail members 83 and 84 engage with two guide pins 85 and 86 provided on the intermediate transfer body unit 80 to guide the intermediate transfer body unit 80. A groove 87 is provided. The guide groove 87 of the guide rail members 83 and 84 is a direction in which the intermediate transfer body unit 80 is guided when being attached to or detached from the apparatus main body 1, and is substantially horizontal or slightly left on the left side with respect to the horizontal direction. A first portion 87a facing in a direction inclined so as to be higher, and an end portion on the right side with respect to the horizontal direction, which is a direction for guiding the intermediate transfer belt 20 of the intermediate transfer body unit 80 to the operating position of the apparatus main body 1. And a second portion 87b facing in a direction inclined so as to increase by a predetermined height, and the first portion 87a and the second portion 87b are connected via a bent portion 87c. . Of course, the first part 87a and the second part 87b may be configured to be connected via a smoothly curved curved portion.

  On the other hand, the intermediate transfer member unit 80 has guide pins 85 and 86 for guiding the intermediate transfer member unit 80 on the front and rear side surfaces thereof, on the end of the intermediate transfer member unit 80 on the drive roll side. It is provided so as to protrude outward in the vicinity of the portion and in an intermediate position separated by a predetermined distance from the vicinity of the end on the drive roll 80 side. The intermediate transfer body unit 80 is provided with positioning pins 88 for positioning the intermediate transfer body unit 80 in the vicinity of the backup roll 23 on the front and rear side surfaces.

  The intermediate transfer unit 80 opens the side cover 90 provided on the side surface of the digital color MFP main body 1 when it is mounted on the digital color MFP main body 1 as shown in FIGS. In this state, the two guide pins 85 and 86 of the intermediate transfer body unit are engaged with the guide grooves 87 of the guide rail members 83 and 84 of the digital color MFP main body 1. Thereafter, as shown in FIG. 9, the intermediate transfer body unit 80 is pushed into the digital color multifunction peripheral main body 1 so that the two guide pins 85 and 86 of the intermediate transfer body unit 80 are shown in FIG. As described above, the guide rail members 83 and 84 are guided along the first portion 87a of the guide groove 87 along the substantially horizontal direction. The guide groove 87 of the guide rail members 83 and 84 is formed with a mountain-shaped protrusion 87d at the end on the inlet side, and the guide pins 85 and 86 of the intermediate transfer body unit 80 are connected to the guide rail. The members 83 and 84 are prevented from dropping unintentionally from the guide grooves 87.

  Further, as shown in FIG. 8, when the intermediate transfer body unit 80 is deeply pushed into the digital color MFP main body 1, the two guide pins 85 and 86 of the intermediate transfer body unit 80 are guided rail members. The guide grooves 87 of 83 and 84 move from the first part 87a to the second part 87b. Then, the second portion 87b of the guide groove 87 of the guide rail members 83 and 84 is inclined with respect to the first portion 87a, and the intermediate transfer belt 20 of the intermediate transfer member unit 80 is attached to the main assembly 1 of the apparatus. The intermediate transfer body unit 80 is directed to the guide rail member 83, because the right end with respect to the horizontal direction, which is the direction of guiding to the operation position, is inclined so as to be higher by a predetermined height. The intermediate transfer belt 20 of the intermediate transfer body unit 80 is guided to the operating position of the apparatus main body 1 while being guided along the second portion 87 b of the 84 guide grooves 87.

  At that time, when the intermediate transfer body unit 80 is guided along the second portion 87b of the guide groove 87 of the guide rail members 83 and 84, more than half of the intermediate transfer body unit 80 is inserted into the apparatus main body 1. Thus, the intermediate transfer body unit 80 protruding outside the apparatus main body 1 does not interfere with members such as the cover 90.

  When the intermediate transfer body unit 80 is completely attached to the digital color MFP main body 1, the guide pins 85 of the intermediate transfer body unit 80 are the end portions of the guide grooves 87 of the guide rail members 83 and 84. The positioning pin 88 of the intermediate transfer body unit 8 is fitted into the positioning groove 91 of the guide rail members 83 and 84, and the intermediate transfer body unit 80 is positioned at a predetermined position of the digital color multifunction peripheral body 1. As shown in FIG. 7, the fastening operation 92 of the intermediate transfer body unit 80 is fastened to the digital color multi-function peripheral body 1 to complete the mounting operation of the intermediate transfer body unit 80.

  The operation of removing the intermediate transfer body unit 80 is performed by the reverse process of the above mounting operation.

  In this embodiment, as shown in FIG. 7, the intermediate transfer body unit 80 is arranged in a direction substantially parallel to the direction in which it is attached to and detached from the digital color MFP main body 1 and parallel to the intermediate transfer belt 20. A plurality of power supply units 93Y, 93M, 93C, and 93K are provided. The plurality of power supply units 93Y, 93M, 93C, and 93K are for supplying power to the primary transfer rolls 21Y, 21M, 21C, and 21K provided in the intermediate transfer unit from the multifunction machine main body 1 side.

  The plurality of power feeding units 93Y, 93M, 93C, and 93K are arranged such that when the intermediate transfer unit 80 is attached to the digital color MFP main body 1, the intermediate transfer unit 80 is guided by the guide grooves 87 of the guide rail members 83 and 84. The intermediate transfer member unit 80 is guided along the second portion 87b of the intermediate transfer unit 80 and is mounted at a predetermined position of the multi-function device main body 1 while moving upward from below. , 93M, 93C, and 93K are provided with electrodes exposed on the upper end surfaces thereof, and a power supply unit 94Y provided corresponding to a plurality of power supply units of the intermediate transfer body unit on the digital color MFP main body 1 side. , 94M, 94C, 94K are provided with electrodes exposed at the lower end surfaces thereof. The plurality of power feeding portions 93Y, 93M, 93C, and 93K of the intermediate transfer body unit 80 are formed in a spring shape so that the power feeding portions 94Y, 94M, 94C, and 94K on the digital color multi-function peripheral body 1 side are securely connected. It is possible to supply power by touching.

  Further, as shown in FIG. 2, the digital color multi-function peripheral is provided with transfer paper transport paths 47 and 51 on the left side surface of the multi-function machine main body 1. Therefore, the transfer paper transport paths 47 and 51 are provided. In this case, a jam such as a paper jam may occur. For this reason, in this digital color multifunction peripheral, as shown in FIG. 9, the left and right sides of the multifunction peripheral body 1 are opened and closed with respect to the multifunction peripheral body 1 including the manual feed tray and the duplex unit, and a transfer paper transport path 47 is provided. , 51 is provided so that it can be opened and closed.

  Further, as described above, the side cover 90 needs to be opened and closed when the intermediate transfer unit 80 is attached and detached. However, the side cover 90 needs to be greatly opened and closed when the intermediate transfer body unit 80 is attached / detached so as not to hinder the operation of attaching / detaching the intermediate transfer body unit 80. On the other hand, when a jam such as a paper jam occurs and the paper is removed, it is not necessary to open over a larger angle than when the intermediate transfer unit 80 is attached or detached.

  Therefore, the side cover 90 has an opening / closing angle with respect to the digital color MFP main body 1 so that the user operation position for removing the jammed paper and the intermediate transfer body unit 80 can be attached and detached. At least two opening angles can be set at the maintenance position. As shown in FIGS. 10 and 11, the side cover 90 has an engagement position 95 a on the multifunction device main body 1 side of the strap 95 that holds the side cover 90, an upper user operation position 95 a ′, and a lower maintenance position. By changing the position to the position 95a ", at least the opening angle can be set in two stages. The opening / closing angle of the side cover 90 is normally set to a user operation position for removing the jammed paper. The strap locking position is changed by the service engineer because the service engineer is scheduled to attach and detach the intermediate transfer body unit 80.

  Further, in this embodiment, since the cleaning device 63 that cleans the surface of the intermediate transfer belt 20 of the intermediate transfer body unit 80 needs to be accurately positioned with respect to the surface of the intermediate transfer belt 20, the cleaning device As shown in FIG. 7, 63 is detachable from the multifunction machine main body 1 only when the intermediate transfer body unit 80 is attached to the multifunction machine main body 1. Further, the intermediate transfer body unit 80 can be detached from the multifunction machine main body 1 only when the cleaning device 63 is detached from the multifunction machine main body 1.

  In the above configuration, in the digital color multifunction peripheral according to the present embodiment, the maintenance and operability of the intermediate transfer belt unit are improved while achieving the downsizing of the apparatus and the apparatus main body frame as follows. It is possible to ensure the rigidity.

  That is, in the digital color multifunction peripheral according to this embodiment, as shown in FIG. 9, the front provided on the front surface of the digital color multifunction peripheral main body 1 when the intermediate transfer belt unit 80 is exchanged or maintenance inspection is performed. Open the cover 95. In the digital color multifunction peripheral, as shown in FIG. 9, the cleaning device 63 for the intermediate transfer belt 20 is pulled out to the front side and removed from the multifunction peripheral body 1. In this digital color multifunction peripheral, as shown in FIGS. 6 and 12, the retract handle 81 of the intermediate transfer belt unit 80 is rotated, and the intermediate transfer belt 20 is moved to the image forming units 13Y, 13M, 13C, and 13K. Is separated from the photosensitive drum 15.

  Next, in the digital color multifunction peripheral, as shown in FIG. 9, the side cover 90 provided on the left side surface of the digital color multifunction peripheral main body 1 is opened and the side cover 90 is held as shown in FIG. The locking position of the strap 95 on the multifunction machine main body 1 side is changed to the maintenance position below, and the side cover 90 is opened to have a large opening angle.

  Furthermore, in the digital color multifunction peripheral, as shown in FIG. 7, the fastening part 92 of the intermediate transfer body unit 80 is removed from the digital color multifunction peripheral body 1 and the intermediate transfer body unit 80 is held by hand. Pull out gradually on one side. At this time, as shown in FIG. 8, the intermediate transfer unit 80 is inclined along the first portion 87a from the inclination angle along the second portion 87b of the guide groove 87 of the guide rail members 83 and 84. It moves to an angle, and the left end of the intermediate transfer body unit 80 is gradually inclined upward.

  Therefore, as shown in FIGS. 13 and 14, the intermediate transfer member unit 80 is easily pulled out to the side of the multi-function device body 1 without interfering with the side cover 90 of the digital color multi-function device. It can be removed from the machine body 1.

  Further, the intermediate transfer body unit 80 may be pulled out to the side surface of the digital color multifunction peripheral body 1, so that the intermediate transfer body unit 80 of the multifunction peripheral body 1 is pulled out to the front of the digital color multifunction peripheral body 1. It is not necessary to provide a large opening on the front surface, the rigidity of the multifunction machine main body 1 is not lowered, and as a result, the rigidity of the multifunction machine main body 1 does not need to be increased unnecessarily. Miniaturization is possible.

1: Digital color MFP main body, 13Y, 13M, 13C, 13K: Yellow (Y), magenta (M), cyan (C), black (K) image forming units, 15: photosensitive drum, 20: intermediate Transfer belt, 80: intermediate transfer body unit, 83, 84: guide rail member, 85, 86: guide pin, 87: guide groove, 87a: first part, 87b: second part.

Claims (1)

A plurality of image forming units that form toner images of different colors;
A belt-like intermediate transfer member that is disposed in an inclined state with respect to a horizontal direction over the plurality of image forming units and onto which toner images formed by the plurality of image forming units are transferred;
An intermediate transfer body unit that detachably holds the belt-shaped intermediate transfer body from the side of the apparatus body; and
A member that removably guides the intermediate transfer unit in the direction of one side surface of the apparatus main body, and the direction in which the intermediate transfer unit is guided changes midway so that the downstream side in the mounting direction is positioned upward. A guide rail member set to
The intermediate transfer belt provided on the back side of the apparatus main body along the attaching / detaching direction of the intermediate transfer member unit so as to be exposed toward the intermediate transfer member unit along the attaching / detaching direction of the intermediate transfer member unit. A plurality of power feeding sections for feeding power to
A plurality of electrodes provided corresponding to the power supply unit on the apparatus main body side so as to be exposed toward the power supply unit on the apparatus main body side on the intermediate transfer body unit ;
The plurality of electrodes are formed in a spring shape,
The guide rail member that mates with the intermediate transfer body unit includes a power supply unit disposed on the most upstream side in the mounting direction of the intermediate transfer unit when the intermediate transfer body unit is mounted on the apparatus main body. After the electrode arranged on the most downstream side in the mounting direction of the intermediate transfer unit comes into contact, the power feeding unit arranged on the most downstream side in the mounting direction of the intermediate transfer unit and the mounting direction of the intermediate transfer unit most. An image forming apparatus that guides the intermediate transfer unit so that an inclination angle of a portion that guides the intermediate transfer unit does not change until an electrode disposed on the downstream side contacts.

Images