JP2000029253A - Image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the need for a cleaning member designed specifically for preventing the original-document carrying roller of an original-document carrying device from being soiled, to reduce cost, and to improve space efficiency, in the image forming device that forms images after reading an original document by the use of both an original-document fixing system and an original- document moving system. SOLUTION: The device forms the images by using together, at the time of reading the original document 3, the original-document moving system in which the original document 3 is fed to an original-document-reading position 27a by the original-document carrying device 2, its contents are read, and the read original-document 3 is carried by a carrying roller 42 and a carrying follower-roller 42a, and the original-document fixing system in which the original document 3 is placed on a table glass 28, is pressed with the original-document press member 46 of the original-document carrying device 2, and is read. On the back of the original-document press member 46 of the original-document carrying device 2, the carrying follower-roller 42a abuts.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a document moving system in which, when reading a document, the document is fed to a document reading position by a document feeder, the contents thereof are read, and the read document is fed by a document feed roller. The present invention relates to an image forming apparatus that forms an image by using a document fixing method in which a document is placed on a document mounting table and pressed by a document pressing member of a document feeder to read the document. The present invention relates to prevention of contamination of a document transport roller provided in a transport device.

[0002]

2. Description of the Related Art An image forming apparatus such as a copying machine employs a document fixing method in which a document is placed on a document table and the contents thereof are read, and a document which enables the document to be automatically read. 2. Description of the Related Art There is known an image forming apparatus which reads a document using a moving method and forms an image.

Here, as a conventional example of a paper feed roller cleaning means in a facsimile apparatus as an image forming apparatus or a copy machine, there is one disclosed in Japanese Utility Model Laid-Open No. 4-68038, for example.

In the technique disclosed in the above publication, a document 101 is conveyed by a paper feed roller 102 as shown in FIG. At this time, when the printed original 101 comes into contact with the paper feed roller 102, the recording ink, paper dust, etc.
Since 3 adheres to the paper feed roller 102, the paper feed roller 102 becomes dirty.

Therefore, in the facsimile apparatus and the copying machine, a cleaner 104 is permanently provided to remove dirt attached to the paper feed roller 102, and the surface of the dirty paper feed roller 102 is cleaned by the cleaner 104. I am trying to do it.

[0006] The above-mentioned technique is, as shown in a schematic diagram of FIG. 11, a method of pressing a cleaning brush 112 to clean the surface of a contaminated conveying roller 111, which is the most typical example.

Another example is similar to the cleaning brush 112 shown in FIG. 11 described above, but as shown in FIG.
22. Further, as shown in FIG. 13, there is a method in which a sponge roller 132 is pressed against the surface of a roller 131, and this method is characterized in that a friction load is small.

[0008]

However, the above-mentioned conventional image forming apparatuses such as facsimile machines and copy machines all require a specially-added cleaning member, which causes an increase in cost and an increase in arrangement. There is a problem that a space and a storage space for the collected material are required.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has as its object to provide an image forming apparatus which reads an original by using both an original fixed system and an original moving system and forms an image. Another object of the present invention is to provide an image forming apparatus which does not require a dedicated cleaning member in order to prevent the document conveying roller of the document conveying device from being stained, thereby reducing costs and improving space efficiency.

[0010]

In order to solve the above-mentioned problems, an image forming apparatus according to the first aspect of the present invention supplies a document to a document reading position by a document conveying device when reading the document. Combination of the original moving system, in which the contents are read and the scanned originals are transported by the original transport rollers, and the original fixing system, in which the originals are placed on the original mounting table and held down by the original pressing member of the original transporter to read the originals An image forming apparatus for forming an image by means of a document feed roller is characterized in that a document feed roller is in contact with the back side of a document pressing member in the document feeder.

According to the above-mentioned invention, in the original moving system, the original is fed by the original transport device and read at the original reading position, and the read original is transported by the original transport rollers. On the other hand, in the original fixing method,
The document is placed on a document table, and is pressed by a document pressing member of the document feeder to read the document.

In an image forming apparatus using both the original moving method and the original fixing method, when the original is read by the original moving method by the original conveying device, the scraps of the original and the recording ink written on the original are removed. Since the originals adhere to the original conveying rollers inside the original conveying device, the original conveying rollers become dirty.

However, according to the present invention, the document conveying roller is in contact with the back side of the document pressing member in the document conveying device. For this reason, even if the original transport roller is contaminated when the original is transported by the original moving method, when the original transport roller rotates, the dirt is scraped off by the original pressing member.

Therefore, it is possible to prevent the document conveying roller in the document conveying device from being stained.

By the way, in cleaning the original conveying roller, the present invention uses an existing original pressing member in the original conveying device. That is, no special additional cleaning means is provided for cleaning the document transport roller. Therefore, since a dedicated member is not used for cleaning the document conveying roller, it is advantageous in terms of cost, size and weight.

As a result, it is possible to provide an image forming apparatus which does not require a dedicated cleaning member in order to prevent the original conveying roller of the original conveying apparatus from being stained, thereby reducing costs and improving space efficiency. .

According to a second aspect of the present invention, in order to solve the above-mentioned problems, in the image forming apparatus according to the first aspect, the document pressing member is partially or entirely made of an elastic material. In addition, the document transport roller is characterized by being in contact with the elastic material.

According to the invention, the document pressing member is partially or entirely made of an elastic material, and the document conveying roller is in contact with the elastic material.

Therefore, when the dirt adhering to the original transport roller is cleaned by the original pressing member, the original transport roller is rubbed by the elastic material. Therefore,
Dirt can be more reliably removed than by cleaning with a non-elastic material.

In general, a portion of the document pressing member that comes in contact with the document is of a white type. Therefore, according to the present invention, as a configuration of the document pressing member, for example, a white film is used on the document side, and a two-layer structure is used in which an elastic material such as sponge is adhered to the back surface of the white film. Can be.

As a result, while using a white film on the original side of the original pressing member to improve the image quality,
On the back side of the white film in the document holding member, as described above, dirt attached to the document conveying roller is easily removed by the elastic material, and the height of the document holding member and the document mounting table is set by the elastic material. Can be absorbed, and the original can be brought into close contact with the original mounting table.

According to a third aspect of the present invention, there is provided an image forming apparatus according to the first or second aspect, wherein the document conveying roller is in contact with a side surface of the document pressing member. It is characterized by having.

According to the above invention, the document transport roller is
The document holding member is in contact with a side surface of the document holding member.

That is, when cleaning the original transport roller with the original pressing member, the rear surface of the original pressing member does not necessarily have to be the back surface of the original pressing member, and may be the side surface of the original pressing member. That is, when the document is not on the surface of the document pressing member, the document conveying roller is not exposed when reading the document by the document fixing method, and there is no obstacle to reading the document.

In some cases, the height of the document feeder can be reduced by contacting the document feed roller with the side surface of the document hold member rather than with the back surface of the document hold member. is there.

According to a fourth aspect of the present invention, there is provided an image forming apparatus according to the first, second, or third aspect, wherein the original pressing member which comes into contact with the original transport roller comprises an original. While the document holding member is attached to the conveyance device main body, a part or all of the document pressing member is separated from or attached to the document conveyance device main body so as to enable cleaning of a portion of the document pressing member that comes into contact with the document conveyance roller. It is characterized by being formed as possible.

That is, since the document conveying roller is in contact with the document pressing member, the contact portion on the back side of the document pressing member gradually becomes dirty.

Here, in the present invention, the original pressing member that comes into contact with the original conveying roller is attached to the main body of the original conveying device, while the original pressing member is the part of the original pressing member that is in contact with the original conveying roller. In order to enable cleaning, a part or the whole of the document conveying device main body is formed so as to be detachable from and connected to the document conveying device main body.

For this reason, a part or the whole of the document pressing member can be separated from the main body of the document conveying device, and the contact portion with the document conveying roller on the back side of the document pressing member can be easily exposed. The part can be cleaned by manually wiping or the like. Also,
Thereby, the initial cleaning effect can be maintained.

Therefore, it is possible to provide an image forming apparatus having good handleability.

[0031]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. In the following embodiments, an example in which the present invention is applied to a copying machine as an image forming apparatus will be described, and the copying machine will be described as being capable of performing both-side printing as well as single-side printing.

As shown in FIG. 2, the copying machine 1 has a document feeder 2 on the upper side. This document feeder 2
Is for enabling reading of the original 3 by the original moving method.
Is automatically fed onto the platen glass 27, and the document reading unit 4 can read one-sided or both-sided image information of the document 3.

When reading a document in the document fixing system, the copying machine 1 places the document 3 on a table glass 28 described later as a document mounting table, and places the document 3 on a document pressing member 46 of the document feeder 2 described later. The original 3 is held down, and the original is scanned by the original reading unit 4 to read the contents of the original 3.

The copying machine 1 houses the original reading section 4, an image forming section 5 for printing image information of the original 3 read by the original reading section 4 on a recording sheet 7, and stores the recording sheet 7. And a paper feed unit 6 for sequentially feeding the stored recording paper 7 to the image forming unit 5.

As shown in FIG. 1, the original reading section 4
A lamp reflector assembly 8 for exposing the original 3 and a reflected light image from the original 3 are converted into a photoelectric conversion element (hereinafter, referred to as a “CCD (C
harge Coupled Device) 11), reflecting mirrors 9a to 9c, an optical lens body 10 for imaging reflected light from the original 3, and reflected light formed by the optical lens body 10. The CCD 11 converts an image into an electric image signal.

The above-described lamp reflector assembly 8 includes:
When reading the original 3 by the original moving method, the original 3 that is kept fixed below the platen glass 27 and conveyed on the platen glass 27 is exposed. On the other hand, when reading the original 3 in the original fixed mode, the lamp reflector assembly 8 moves below the table glass 28 with respect to the original 3 placed on the table glass 28 and
Is exposed and scanned.

The document reading section 4 converts the image information of the document 3 read as described above into an image signal via an image processing unit (not shown), and converts the image information into a signal as shown by a solid line in FIG. The laser beam corresponding to the signal is applied to the photoconductor 13 in the image forming unit 5 by the semiconductor laser 12.
To form an electrostatic latent image on the surface of the photoconductor 13.

The image forming section 5 includes a drum-shaped photosensitive member 13.
A developing unit 14 for visualizing the electrostatic latent image on the photoconductor 13 with toner; a transfer unit 15 for transferring a visible image of the photoconductor 13 with toner to the recording paper 7; A cleaning unit 16 for removing the residual toner, a charging unit 17 for charging the photoconductor 13 to a predetermined potential, and a fixing unit 18 for fixing the toner image transferred to the recording paper 7 by heat and pressure are provided.

An image forming operation in the copying machine 1 having the above configuration will be described.

First, the recording paper 7 is transported from the paper supply unit 6 to a recording paper transport path 19 that passes between the photoconductor 13 and the transfer unit 15.

In the recording paper transport path 19, the recording paper 7
Is once held by the first roller 20. That is, the first roller 20 is used in the image forming section 5 to
In order to accurately transfer the toner image on the surface of the photoconductor 13 to the recording paper 7, the recording paper 7 is moved at a predetermined timing so that the leading end of the image information including the toner image and the leading end of the recording paper 7 are aligned. It is transported to the forming section 5.

The recording paper 7 on which an image has been formed by passing through the recording paper transport path 19 is sent to the paper discharge unit 23 by driving the second roller 21 capable of normal and reverse rotation forward.

At this time, if the image forming operation is a one-sided printing process, the recording paper 7 is discharged to the paper discharge unit 23 as it is. However, when the image forming operation is a double-sided printing process, in order to subsequently print on the back surface of the recording paper 7, the second roller 21 is held in a state where the rear end of the recording paper 7 is clamped. The recording paper 7 is sent to the recording paper re-conveying path 24 which forms a loop with the recording paper conveying path 19 by inverting the driving. The recording paper re-conveying path 24
Is provided with a third roller 22 for normally assisting the conveyance of the recording paper 7.

In the copying machine 1, a side cover 25 arranged on the side of the recording paper re-conveying path 24 has an open / close shaft 26.
Is provided rotatably around the fulcrum. When a paper jam or the like occurs in the recording paper transport path 19 or the recording paper re-transport path 24, the side cover 25 can be opened to perform a jam clearance. I can do it.

Next, the document feeder 2 will be described.

The document feeder 2 according to the present embodiment has a so-called SPF (Single Pass Feeder) or DSPF (Duplex) capable of automatically reading one or both sides of a document.
The document feeder 2 is a single pass feeder or the like.

In the document feeder 2 capable of automatically reading the one-sided or two-sided document,
Generally, as shown in FIG. 1, a PS (Paper Stop) roller 32 and a transport roller 42 for transporting a document before and after in the document transport direction in the document transport mechanism are provided, respectively. The document reading position 27a is arranged between the transport rollers 42.

In the one-sided automatic document feed (SPF), the originals 3 are taken out one by one from an original tray 31 serving as an original placing tray, transported to an original reading position 27a by a PS roller 32, and the original 3 is read. After that, the sheet is discharged to the sheet discharge tray 34 by the transport roller 42 and the sheet discharge roller 33.

In the automatic double-sided document feed (DSPF), similarly, after reading one side of the document 3 conveyed one by one by the PS roller 32, the document 3 is conveyed by the conveyance roller 42 and the discharge roller 33. Discharge rollers 3 for conveying and discharging
By rotating the document 3 in a direction opposite to the discharging, the back side of the document 3 is read and the document 3 is discharged.

The configuration of the document feeder 2 having the above functions will be described in detail.

As shown in FIG. 1, the document feeder 2 includes a document tray 31, a PS roller 32 provided on the document feed direction input side of the document reading position 27a, and a document feed direction discharge from the document read position. Transport roller 4 provided on the paper side
2, a paper discharge roller 33 and a paper discharge tray 34, and a main conveyance path 35 for conveying the original 3 to the original reading position 27a, and a main conveyance again for the original 3 switched back during double-sided reading. It has a reversing conveyance path 36 for feeding into the path 35.

The driving force of the PS roller 32 and the conveying roller 42 is driven by a motor 51 as shown in FIG. That is, the rotational force of the motor 51 is transmitted to the transport roller 42 via the clutch 52. Further, the driving force of the transport roller 42 is determined by using a drive transmission mechanism (not shown).
The power is transmitted to the roller 32.

In the document feeder 2, a plurality of documents 3 to be read are placed on a document tray 31. The PS roller 32 is arranged in front of the document reading position 27a in the main transport path 35, and once stops the document 3 sent into the main transport path 35, and then sets the reading start position of the document 3 The document 3 is sent to the document reading position 27a at a predetermined timing for control.

That is, when the original 3 from the original tray 31 or the original 3 conveyed by the paper discharge roller 33 which can be rotated forward and backward described below reaches the PS roller 32, the conveyance is temporarily stopped. Thereafter, when the PS roller 32 rotates, the time for the leading edge of the document 3 to reach the document reading position 27a can be set in advance by passing a predetermined distance between the PS roller 32 and the document reading position 27a. is there.
Accordingly, the irradiation start is started at a timing when the lamp light amount of the lamp reflector assembly 8 in the document reading unit 4 becomes constant when the document 3 arrives,
Stable image reading is performed.

As described above, the PS roller 32 is rotated, stopped, and re-rotated in order to output the reference value of the optical system start timing required for stable document reading.

The PS roller 32 has the following other functions.

For example, if the document 3 conveyed to the PS roller 32 has a skew called “diagonal feed”, when the PS roller 32 is temporarily stopped and re-rotated,
The skew is corrected. As a principle of the correction, when the PS roller 32 is temporarily stopped, the original 3 is transferred to the main transport path 35 between the sheet feeding roller 38 and the PS roller 32 shown in FIG.
Alternatively, it stops with slack in the reverse conveyance path 36 and the main conveyance path 35 between the paper discharge roller 33 and the PS roller 32. At this time, the correction is performed based on the elasticity of the document of the document 3, and the leading end of the document 3 is corrected so as to be perpendicular to the PS roller 32.

As a result, in the next step, the PS roller 3
When the document 2 rotates, the document 3 is transported in a normal state.

Then, as described above, the document 3 to be conveyed is ejected through the conveyance roller 42 and the sheet ejection roller 33 after its content is read at the document reading position 27a.

The paper discharge roller 33 is a roller that can be rotated forward and backward, and is used to discharge the read original 3 to the paper discharge tray 34 or to send it to the reverse conveyance path 36. The discharge tray 34 is a discharge destination of the document 3 that has been read.

When reading only one side of the document 3 in the document feeder 2, the document 3 fed from the document tray 31 is picked up by the pickup roller 37 and the paper feed roller 38.
To the main transport path 35, and the original reading position 27a
The document 3 is read. The paper feed roller 38
Is in contact with the paper feed pad 39, and when two or more originals 3 are simultaneously sent out by the pickup roller 37, the conveyance of the lower original 3 is regulated by the paper feed pad 39. 3 can be sent out one by one from the top.

Here, the original reading position 27a is a position where the light of the lamp reflector assembly 8 in the original reading section 4 of the copying machine 1 is irradiated. That is, a platen glass 27 is provided on the upper surface of the document reading unit 4 corresponding to the position of the lamp reflector assembly 8, and when the document 3 moves on the upper surface of the platen glass 27, light is irradiated on the document surface. Then, reading is performed on the lower surface of the document 3.

At the document reading position 27a, a position regulating member 40 is disposed above the platen glass 27. As shown in FIG. 3, the position regulating member 40 has downward convex portions 40a at both ends thereof, and the original 3 passes between the platen glass 27 and the position regulating member 40. Thereby, the optimal positional relationship with the platen glass 27 can be maintained. Further, as shown in FIG. 1, the position regulating member 40 is provided with, for example, a conical coil spring or a cylindrical member so that the distance between the document 3 and the platen glass 27 can be appropriately maintained regardless of the thickness of the document 3. It is urged downward by a spring 41 such as a coil spring.

The original 3 thus read is transferred to the discharge tray 3 by the transport roller 42 and the discharge roller 33.
4 is discharged.

When reading both sides of the document 3,
First, the surface of the document 3 is read by the document reading unit 4 on the platen glass 27 by the same operation as the one-side reading described above. The document 3 whose one side has been read is sent to the reversing tray 43 side instead of the sheet discharging tray 34 side. That is,
A switching gate 44 is arranged on the downstream side of the discharge roller 33, and the destination of the document 3 can be switched between the discharge tray 34 and the reversing tray 43 depending on the position of the switching gate 44.

Thereafter, in order to read the back side of the original 3,
In a state where the document 3 is sandwiched between the discharge roller 33 and the discharge driven roller 33a, the discharge roller 33 is driven to rotate in the reverse direction, and the document 3 is sent to the reverse conveyance path 36.

That is, a switching gate 45 is disposed at the junction of the main transport path 35 and the reverse transport path 36 on the upstream side of the paper discharge roller 33, and the rear end of the original 3 sent to the reverse tray 43. At the time when the position exceeds the tip of the switching gate 45, the position of the
Is driven in the reverse direction, the original 3 is sent out to the reverse conveyance path 36.

The original 3 sent to the reverse transport path 36 is again sent from the main transport path 35 to the original reading position 27a, and after the reading of the back surface is completed, is discharged onto the paper discharge tray 34.

In the above description, the operation of reading the original 3 by the original transport system by the automatic transport mechanism of the original transport device 2 has been described. When it is not necessary to perform the operation, or when the material of the original 3 is hard and the use of the automatic transport mechanism is difficult, the original 3 can be read by the original fixed system without using the automatic transport mechanism. It is possible.

That is, as shown in FIG.
Is provided so as to be capable of rotating and opening and closing with respect to the copying machine 1,
A table glass 28 corresponding to the maximum size of the readable original 3 is provided on the upper surface of the copying machine 1.
Therefore, when reading the original 3 using the table glass 28, first, after opening the original transport device 2, the original 3 is placed on the table glass 28 with its reading surface down, and thereafter, The document feeder 2 is closed. As shown in FIG. 5, a document pressing member 46 made of an elastic material 46a and a white film 46b is provided on the lower surface of the document feeder 2, and as shown in FIG. Thereby, the document 3 is pressed against the table glass 28. In this state, as shown in FIG. 1, the scanning of the original 3 is performed by scanning the scanning unit formed by the lamp reflector assembly 8 of the original reading section 4 and the reflection mirrors 9a to 9c along the original surface. It becomes possible.

Next, the characteristic portions of the document feeder 2 of the present embodiment will be described in detail below.

As described above, the original 3 is transferred to the main transport path 35.
Is guided by the paper guides 53 and 54 in
After being conveyed to the document reading position 27a by the S roller 32 and the PS driven roller 32a, the document is placed on the discharge tray 34 by the discharge roller 33 via the conveyance roller 42 and the conveyance driven roller 42a, or the document 3 In order to read the back surface, the sheet is conveyed to a both-side reading step by the reverse rotation of the paper discharge roller 33. In the present embodiment, the transport rollers 4
2 and the transport driven roller 42a are the document transport rollers of the present invention.

Here, the transport driven roller 4 of the present embodiment
2a is a document holding member 4 as shown in FIGS.
6 is in contact with the back side.

As described above, the original pressing member 46 is formed of the elastic member 46a and the white film 46b, and the above-mentioned transport driven roller 42a is in contact with the elastic member 46a of the original pressing member 46. .

Therefore, even if the surface of the transport driven roller 42a is stained by recording ink, paper dust, or the like due to the passage of the document 3, the stain is removed by the transport driven roller 42a by the elastic material 46a
Are scraped off by this elastic material 46a.

Therefore, even if the transport driven roller 42a becomes dirty, it can be immediately removed.

In the drawing, the transport driven roller 42a is in contact with the back surface of the elastic member 46a. However, the present invention is not limited to this. As shown in FIG. It is also possible to contact the side surface of 46a. This also enables the cleaning of the transport driven roller 42a.

On the other hand, the original pressing member 46 is
As shown in (1), the document holding member holding frame 2a as the document feeder main body is rotatably attached to an edge of the document holding device main body, and the entire back surface of the document holding member 46 can be opened.

Accordingly, by completely opening the back surface of the document pressing member 46, the transport driven roller 42a
The contact surface 46c is exposed so that a service person can clean the contact surface 46c with a cloth (not shown) or the like.

In the above-described embodiment, the entire surface of the document pressing member 46 is openly exposed. However, the present invention is not limited to this. For example, as shown in FIG. It is also possible that the member 46 is bent at a substantially central position so that a part of the document pressing member 46 is opened.

In this manner, the contact surface 46c is exposed, so that cleaning can be performed.

As described above, in the copying machine 1 of the present embodiment, the original 3
The document 3 is fed by the paper feed roller 38 and the PS roller 32 and is read at the document reading position 27a, and the read document 3 is conveyed by the conveyance roller 42 and the conveyance driven roller 42.
a and the paper is conveyed by the paper discharge roller 33.

On the other hand, in the document fixing method, the document 3 is placed on the table glass 28 and pressed by the document pressing member 46 of the document feeder 2 to read the document 3.

In the copying machine 1 using both the original moving system and the original fixed system, when the original 3 is read by the original conveying device 2 by the original moving system, dusts on the original 3 and the original 3 are written. The recording ink adheres to the transport roller 42 and the transport driven roller 42a in the document transport apparatus, so that the transport roller 42 and the transport driven roller 42a become dirty.

However, in the present embodiment, the conveyance driven roller 42 a is in contact with the back side of the document pressing member 46 in the document conveyance device 2. For this reason, when the original 3 is conveyed by the original moving method, even if the conveyance driven roller 42a becomes dirty, when the conveyance driven roller 42a rotates, the dirt is scraped off by the original pressing member 46.

Therefore, it is possible to prevent the conveyance driven roller 42a in the document conveyance device 2 from being stained. This also makes it possible to indirectly remove dirt on the transport roller 42.

When cleaning the transport driven roller 42a, the present embodiment uses an existing document pressing member 46 in the document feeder 2. That is, no special additional cleaning means is provided for cleaning the transport driven roller 42a. Therefore, since a dedicated member is not used for cleaning the transport driven roller 42a, it is advantageous in terms of cost, size, and weight.

As a result, in order to prevent the conveyance driven roller 42a and the conveyance roller 42 of the document conveyance device 2 from being stained,
It is possible to provide the copying machine 1 which does not require a dedicated cleaning member, can reduce the cost, and can improve the space efficiency.

In the copying machine 1 of this embodiment, the original pressing member 46 is partially or entirely made of an elastic material 46a, and the transport driven roller 42a is made of the elastic material 4a.
6a.

Therefore, when the dirt adhering to the transport driven roller 42a is cleaned by the document pressing member 46, the transport driven roller 42a is rubbed by the elastic member 46a. Therefore, dirt can be surely removed as compared with cleaning with a material other than the elastic material 46a.

The document pressing member 46 is generally
The portion that comes into contact with the document 3 is of a white type.
Therefore, according to the present embodiment, as a configuration of the document pressing member 46, for example, a white film 46b is used on the document 3 side, and an elastic material 46a such as a sponge is attached to the back surface of the white film 46b. It can be configured as a two-layer structure.

As a result, the image quality is improved by using the white film 46b on the original 3 side of the original pressing member 46, while the elasticity is improved on the back side of the white film 46b by the original pressing member 46 as described above. Lumber 4
6a, the dirt adhering to the conveyance driven roller 42a is easily removed, and the elastic member 46a makes it possible to remove the original pressing member 4a.
The document 3 can be brought into close contact with the table glass 28 by absorbing unevenness in height between the table 6 and the table glass 28.

Further, in the copying machine 1 of the present embodiment, the transport driven roller 42a can contact the side surface of the document pressing member 46.

That is, when cleaning the transport driven roller 42 a with the document pressing member 46, if it is on the back side of the document pressing member 46, it is not always necessary to be the back surface of the document pressing member 46, but on the side of the document pressing member 46. There may be. That is, if the document is not on the surface of the document pressing member 46, when reading the document in the document fixing method, the conveyance driven roller 42a is not exposed and does not hinder the reading of the document 3.

Further, in terms of space, the transport driven roller 42
In some cases, the height of the document feeder 2 can be reduced by abutting the a on the side surface of the document pressing member 46 rather than abutting the back surface of the document pressing member 46.

Since the transport driven roller 42a is in contact with the document pressing member 46, the contact portion on the back side of the document pressing member 46 gradually becomes dirty.

In this embodiment, the original pressing member 46 which comes into contact with the transport driven roller 42a is attached to the original pressing member holding frame 2a, while the original pressing member 46 is driven by the original pressing member 46. Part or all of the document holding member holding frame 2a is formed so as to be detachable from the document holding member holding frame 2a so as to enable cleaning of a portion contacting the roller 42a.

For this reason, it is possible to separate a part or the whole of the document pressing member 46 from the document pressing member holding frame 2a so as to expose a portion of the back side of the document pressing member 46 that abuts on the transport driven roller 42a. Therefore, the portion can be easily cleaned by manually wiping or the like. Thus, the initial cleaning effect can be maintained.

Therefore, it is possible to provide the copying machine 1 with good handling.

[0100]

According to the first aspect of the present invention, there is provided an image forming apparatus comprising:
As described above, the document feed roller is in contact with the back side of the document pressing member in the document feeder.

Therefore, even if the original transport roller is contaminated when the original is transported by the original moving method, when the original transport roller rotates, the dirt is scraped off by the original pressing member.

Accordingly, it is possible to prevent the document conveying rollers in the document conveying device from being stained.

By the way, in cleaning the original conveying roller, the present invention uses an existing original pressing member in the original conveying device. That is, no special additional cleaning means is provided for cleaning the document transport roller. Therefore, since a dedicated member is not used for cleaning the document conveying roller, it is advantageous in terms of cost, size and weight.

As a result, it is possible to provide an image forming apparatus which can reduce the cost and improve the space efficiency without requiring a dedicated cleaning member in order to prevent the original conveying roller of the original conveying apparatus from being stained. This has the effect.

According to a second aspect of the present invention, as described above, in the image forming apparatus according to the first aspect, the document holding member is partially or entirely made of an elastic material. The transport roller is in contact with the elastic material.

Therefore, when the dirt adhering to the original conveying roller is cleaned by the original pressing member, the original conveying roller is rubbed by the elastic material. Therefore,
This has the effect that dirt can be reliably removed as compared with cleaning with a non-elastic material.

In general, a portion of the document pressing member which comes into contact with the document is of a white color. Therefore, according to the present invention, as a configuration of the document pressing member, for example, a white film is used on the document side, and a two-layer structure is used in which an elastic material such as sponge is adhered to the back surface of the white film. Can be.

As a result, the quality of the formed image is improved by using a white film on the original side of the original pressing member, while the original is made of an elastic material on the back side of the white film in the original pressing member, as described above. In addition to making it easy to remove dirt attached to the transport rollers, this elastic material absorbs uneven heights between the document pressing member and the document table,
There is an effect that the document can be brought into close contact with the document table.

According to a third aspect of the present invention, as described above, in the image forming apparatus according to the first or second aspect, the document conveying roller is in contact with a side surface of the document pressing member. It is.

Therefore, when cleaning the original transport roller with the original pressing member, the rear surface of the original pressing member need not necessarily be the back surface of the original pressing member, but may be the side surface of the original pressing member. .
That is, when the document is not on the surface of the document pressing member, the document transport roller is not exposed when reading the document by the document fixing method, so that the reading of the document is not hindered.

Further, in terms of space, it may be possible to reduce the height of the document conveying device by contacting the document conveying roller with the side surface of the document pressing member rather than with the back surface of the document pressing member. There is an effect that there is.

According to a fourth aspect of the present invention, as described above, in the image forming apparatus according to the first, second, or third aspect, the document pressing member that comes into contact with the document transport roller is a document transport device main body. On the other hand, the document pressing member is formed so that a part or all of the document pressing member can be separated from and brought into contact with the document conveying device main body in order to enable cleaning of a portion of the document pressing member that comes into contact with the document conveying roller. Is what is being done.

Therefore, a part or the whole of the document pressing member can be separated from the document conveying device main body, and the contact portion of the document pressing member with the document conveying roller on the back side of the document pressing member can be easily exposed. The part can be cleaned by manually wiping or the like. Also,
Thereby, the initial cleaning effect can be maintained.

Therefore, an effect is obtained that an image forming apparatus with good handling properties can be provided.

[Brief description of the drawings]

FIG. 1 is a configuration diagram illustrating an embodiment of a document feeder mounted on a copying machine according to the present invention.

FIG. 2 is an overall configuration diagram showing a copying machine provided with the document conveying device.

FIG. 3 is a configuration diagram illustrating a position regulating member in the document transport device.

FIG. 4 is an explanatory diagram showing a state in which a document transport device is opened to a copying machine when a document is read by a document fixing method.

FIG. 5 is a perspective view showing a document pressing member of the document conveying device.

FIG. 6 is an explanatory diagram illustrating a state in which a conveyance driven roller of the document conveyance device is in contact with an elastic material on a back surface of a document pressing member.

FIG. 7 is an explanatory diagram illustrating a state in which a conveyance driven roller of the document conveyance device is in contact with an elastic member on a side surface of the document pressing member.

FIG. 8 is a perspective view illustrating a state in which the entire document pressing member is opened to a document pressing member holding frame.

FIG. 9 is a perspective view showing a state where a part of the document pressing member is opened to a document pressing member holding frame.

FIG. 10 is a configuration diagram illustrating a cleaning unit of a paper feed roller in a conventional image forming apparatus.

FIG. 11 is a schematic view showing a conventional cleaning unit of a type in which a cleaning brush is pressed against a paper feed roller.

FIG. 12 is a schematic diagram illustrating a conventional cleaning unit that presses a cleaning pad against a paper feed roller.

FIG. 13 is a schematic view showing a conventional cleaning unit of a type in which a sponge roller is pressed against a paper feed roller.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Copier 2 Document feeder 2a Document holding member holding frame (document transfer device main body) 3 Document 8 Lamp reflector assembly 27 Platen glass 27a Document reading position 28 Table glass (document mounting table) 32 PS roller 33 Discharge roller 40 Position regulation Member 41 Spring 42 Conveying roller (document conveying roller) 42a Conveyance driven roller (document conveying roller) 46 Document pressing member 46a Elastic material 46b White film 51 Motor

Continued on front page F term (reference) 2H076 AA04 AA07 AA58 BA06 BA24 BA48 BA95 BA97 EA14 3F049 AA03 DA12 DA14 LA02 LB02 5C062 AA05 AB17 AB32 AD01 AD06 BA02 BA06 5C072 AA05 BA02 LA18 XA01

Claims (4)

[Claims] When reading a document, a document transporting device feeds the document to a document reading position, reads the contents thereof, and transports the read document by a document transport roller. In an image forming apparatus for forming an image in combination with a document fixing method in which a document is placed on a mounting table and pressed by a document pressing member of a document conveying device to read the document, a document conveying roller is provided on the back side of the document pressing member in the document conveying device. An image forming apparatus, wherein the image forming apparatus is in contact with the image forming apparatus. 2. The image forming apparatus according to claim 1, wherein a part or the whole of the document pressing member is made of an elastic material, and the document conveying roller is in contact with the elastic material. . 3. The document conveying roller according to claim 1, wherein the document conveying roller is in contact with a side surface of the document pressing member.
Or the image forming apparatus according to 2. 4. A document holding member which comes into contact with the document feed roller is attached to a document feeder main body, and the document hold member enables cleaning of a portion of the document hold member which comes into contact with the document feed roller. 4. The image forming apparatus according to claim 1, wherein a part or the whole of the image forming apparatus is formed so as to be detachable from the main body.