JP2003212380A - Original carrier device and picture image formation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a picture image formation device simple in constitution without complication and enlargement, capable of mitigating vibrational impact, acquiring a favorable picture image and reducing impact noise at the time of re-holding it. <P>SOLUTION: This original carrier device is furnished with a driving roller and a driven roller arranged on a carrier route to carry an original (d) and to carry the original by holding it and a roller separation and holding mechanism 883 to separate and hold the driving roller and the driven roller, carries the original to a reading part 422 and reads the original at the reading part 422, and the driving roller and the driven roller are absorbers capable of absorbing the vibrational impact. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention conveys an original document for forming an image by an image forming apparatus such as an electrophotographic copying machine, a printer, a facsimile, and a multifunction peripheral or a printing machine having a plurality of functions of these. The present invention relates to a document conveying device and an image forming device that can read an image.

[0002]

2. Description of the Related Art In a document feeder provided in such a digital image forming apparatus, as shown in FIG. 10, when separating a document one by one by a separating mechanism 101 and reading one side of the document, In the case where the reading unit 103 of the switching gates 106a and 106b ejects the document from the ejection unit 104 to the ejection tray 105 and both sides of the original are read, the switching gate 10 is used.
6a and 106c feed the sheet to the reversing section 107 and reverse it. By switching the switching gates 106b and 106c, one side of the original is read by the reading section 103, and the reversing section 10 is read again by the switching gate 108.
7, the other side of the original is sent to the reading unit 103 by the switching gates 106b and 106c, and the reading unit 103 discharges the original from the reading and discharging unit 104 to the discharge tray 105.

A registration roller 110 for correcting the bending of the document is arranged upstream of the reading unit 103, and the document is conveyed by a conveying roller 111 and a reversing roller 112 arranged in the reversing unit 107, and the document is conveyed. The leading end is abutted against the registration roller 110 to correct the bending of the original, and the original is sent to the reading unit 103 by the rotation of the registration roller 110. Then, on the upstream side of the registration roller 110, there is a substantially triangular space SP for forming a loop for correcting the bending of the document.

[0004]

By the way, the reversing unit 10
The reversing roller 112 arranged at 7 is a driving roller 112.
a and a driven roller 112b, and the nipping release mechanism 1
13 separates the drive roller 112a from the drive roller 1
The grip between 12a and the driven roller 112b is released, and the document is nipped and conveyed at a predetermined timing, but when the separated driving roller 112a and the driven roller 112b are nipped again, a vibration impact occurs.

The drive roller 112a and the driven roller 11
Vibration is transmitted to the reading unit 103 due to the vibration impact caused by 2b, and the image is disturbed. In addition, the impact during re-sandwiching causes noise.

In order to suppress such vibration impact, a member such as a shock absorbing spring 114 is newly provided, but since there is another member, there is a problem that the device becomes complicated and becomes large.

The present invention has been made in view of the above point, and the apparatus is complicated and has a simple structure without increasing the size, and it is possible to reduce vibration and shock and obtain a good image,
Moreover, it is an object of the present invention to provide an original document feeding device and an image forming apparatus capable of reducing impact noise during re-sandwiching.

[0008]

In order to solve the above-mentioned problems and to achieve the object, the present invention has the following constitution.

According to a first aspect of the present invention, a driving roller and a driven roller which are arranged on a conveying path for conveying the original and which nips and conveys the original, and a separation between the driving roller and the driven roller, In a document feeding device having a roller separating / holding mechanism for holding and feeding a document to a reading unit and reading the document at the reading unit, the driving roller or the driven roller can absorb a vibration impact. The original document conveying device is characterized in that it is a different absorbing material.

According to the first aspect of the present invention, since the drive roller or the driven roller is an absorbing material capable of absorbing the vibration impact, the device is simple and simple without increasing the size. With the configuration, it is possible to reduce the vibration impact caused by the drive roller and the driven roller being separated from each other and sandwiching them, to obtain a good image, and to reduce the impact noise at the time of re-sandwiching.

According to a second aspect of the present invention, the driving roller is made of a rubber material and has a rubber hardness of 40 ° or less.

According to the second aspect of the present invention, the driving roller is made of a rubber material, and the vibration and shock caused by the driving roller and the driven roller being separated from each other and sandwiched therebetween are reduced, and a good image is obtained. In addition, it is possible to reduce the impact noise during re-sandwiching.

According to a third aspect of the invention, there is provided the document conveying apparatus according to the first aspect, wherein the driven roller is a soft material.

According to the third aspect of the present invention, the driven roller is made of a soft material and has a simple structure to reduce the vibration impact caused by the drive roller and the driven roller being separated from each other and sandwiched therebetween.
It is possible to obtain a good image and reduce the impact noise during re-sandwiching.

A fourth aspect of the present invention is an image forming apparatus comprising the document feeding device according to any one of the first to third aspects.

According to the invention described in claim 4, the apparatus is simple and has a simple structure without increasing the size, and the vibration impact due to the separation and the sandwiching of the driving roller and the driven roller is reduced, which is excellent. It is possible to obtain a clear image and reduce the impact noise at the time of re-sandwiching.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of an image forming apparatus equipped with a document feeder of the present invention will be described with reference to the drawings, but the present invention is not limited to this embodiment.

FIG. 1 is an overall configuration diagram of an image forming apparatus 1 equipped with a sheet post-processing device FS, a document feeding device DF, and an image reading device (scanner) SC.

The illustrated image forming apparatus main body 1A includes an image processing section 2, an image writing section 3, an image forming section 4, a high voltage power source section 5, a cassette sheet feeding section 6, a fixing device 7, a sheet discharging section 8 and an automatic two-sided copy. Re-transporting means (ADU) 9 for

An image reading device SC and a document feeding device DF are mounted on the upper portion of the image forming apparatus main body 1A.
A sheet post-processing device FS is connected to the sheet discharge unit 8 side in the upper left portion of the image forming apparatus body 1A shown in the figure.

A document d placed on the document table of the document feeding device DF with the first side facing upward is fed in the direction of the arrow and one side or both sides of the document are read by the optical system of the image reading device SC. And is read by the CCD image sensor C1.

The analog signal photoelectrically converted by the CCD image sensor C1 is subjected to analog processing, A / D conversion, shading correction, image compression processing, etc. in the image processing section 2 and then sent to the image writing section 3. .

In the image writing section 3, the output light from the semiconductor laser is applied to the photosensitive drum 4A of the image forming section 4 to form a latent image. In the image forming section 4, processing such as charging, exposure, development, transfer, separation and cleaning is performed, and the image is transferred onto the sheet S conveyed from the cassette sheet feeding section 6. The sheet S carrying the image is fixed by the fixing device 7, and is sent from the paper output unit 8 to the sheet post-processing device FS. Alternatively, the single-sided image-processed sheet S sent to the re-conveying unit 9 by the sheet discharge path switching plate 8A is subjected to double-sided image processing again in the image forming section 4, and then the sheet discharge section 8 is formed.
It is sent to the sheet post-processing device FS by the sheet discharge roller 8B.

The sheet post-processing device FS is detachably attached to the upper left portion of the image forming apparatus main body 1A. The sheet post-processing device FS includes a sheet conveying unit 10, a sheet discharging unit 20, a post-processing unit 30, and an elevating and discharging unit 40, which are arranged in the sheet post-processing device body 45.

In FIG. 1, on the right side in the main body 1A of the image forming apparatus, a cassette sheet feeding section 6 is provided below the image forming apparatus main body 1A with the image forming section 4 as a center, and a fixing device is provided above. 7 and a paper discharge unit 8 are provided. With this vertical arrangement, a substantially vertical sheet conveyance path is formed. The paper S delivered from the cassette paper supply unit 6 is conveyed along the vertically upper paper conveyance path and is discharged to the outside of the image forming apparatus main body 1A.

A sheet conveying path by the re-conveying means 9 is formed substantially parallel to the vertical sheet conveying path.

By forming the above-described vertical paper transport path, the shortest paper transport path from the cassette paper feed unit 6 to the paper discharge unit 8 is formed.

The sheet conveying means 10 of the sheet post-processing apparatus FS is housed in the space above the image forming apparatus main body 1A as shown. The sheet entrance portion 11 of the sheet conveying means 10 is connected to the sheet ejection roller 8B of the sheet ejection section 8 of the image forming apparatus main body 1A. Further, in this mounted state, the sheet discharging unit 20 of the sheet post-processing apparatus FS is provided in the space portion on the upper left side of the image forming apparatus body 1A in the figure.
And the post-processing means 30 is accommodated. The elevating and ejecting means 40 including a plurality of ejection trays (also referred to as bins) 41 and elevating and lowering drive means 42 is located on the left side of the post-processing means 30 in the figure.

Next, the document feeder will be described with reference to FIGS. 2 is a cross-sectional view of the document conveying device, FIG. 3 is a plan view of the document conveying device, FIG. 4 is an enlarged view of a main part of the document conveying device, FIG. 5 is an enlarged view of a switching portion, and FIG. FIG. 7 is a diagram showing a state, FIG. 7 is a diagram showing a state in which the loop rollers are released from being pinched, FIG. 8 is a diagram showing a single-sided sheet passing path, and FIG. 9 is a diagram showing a double-sided sheet passing path.

The document feeder DF includes a document feeder 20.
0, a document discharge unit 300, and a document transport unit 400 are arranged.

The document feeding section 200 has a sheet feeding tray 201 on which a plurality of documents can be set, and a pair of regulation plates 202 for positioning the document in the sheet width direction are movable in the sheet width direction. It is provided in. Further, the paper feed tray 201 has a length direction detecting means S1 for detecting the length direction of the document.
The sensors that configure 1, S12 are arranged at two locations.

The document discharge section 300 has a discharge tray 301, and this discharge tray 301 is arranged below the document feed section 200. The document transport unit 400 is placed on the discharge tray 301.
The document that has been conveyed so that one side can be read or that has been conveyed so that both sides can be read is ejected.

The original conveying section 400 includes a first conveying path 410 on the upstream side, a second conveying path 420 and a third conveying path branched on the downstream side.
It has a transport path 430 and a discharge section 440. In the first conveyance path 410, the movable pressing plate 411, the pickup roller 412, the separation conveyance roller 413, the double feed prevention roller 41.
4 are arranged. The movable pressing plate 411 rises at every sheet feeding and presses the original document against the pickup roller 412 to press the original document against the separation / conveyance roller 413.
The document is separated and conveyed one by one by the 3 and the double feed prevention roller 414. Further, on the downstream side of the separation / conveyance roller 413 and the double feed prevention roller 414, the document length detecting means S2 is provided.
The sensors that make up No. 1 are arranged.

The registration roller 4 is provided in the second transport path 420.
21, a reading unit 422, a reading pressing roller 423, and a conveying roller 424 are arranged. A sensor forming the document leading edge detecting means S31 is arranged on the downstream side of the registration roller 421. The registration roller 421, the reading and pressing roller 423, and the transport roller 424 can rotate in the forward direction of the document.

A transport roller 431 is provided in the third transport path 430.
And the reversing unit 432 is arranged. The reversing unit 432 is
It has a reversing roller 433. The transport roller 431 and the reversing roller 433 can rotate forward and backward. Ejection unit 440
A paper discharge roller 441 is disposed in the printer.

In addition, in the first transport path 410, the second transport path 420 and the third transport path 43 downstream of the first transport path 410 are provided.
A first switching member 450 that can be switched to 0 is provided. The first switching member 450 is rotatably provided integrally with the support shaft 453. An arm 453a is provided at one end of the support shaft 453, and an arm 453 is provided at the other end.
b is provided, the arm 453a is biased by the spring 451, the first switching member 450 opens the second transport path 420,
The third transport path 430 is closed. Further, the arm 453b is operated by the solenoid 452 against the spring 451. When the solenoid 452 is operated, the second conveyance path 420 is closed and the third conveyance path 430 is opened.

Furthermore, a second switching member 460 and a third switching member 470, which are integrally formed, are rotatably supported on the support shaft 453. The second switching member 460 and the third switching member 470 are biased by the spring 471, the second switching member 460 opens the second transport path 420, and the third switching member 470.
Closes the third transport path 430.

The second transport path 420 includes the first transport path 410.
And a second switching member 460 that is urged in one direction to enable conveyance from both sides of the third conveyance path 430.
The switching member 460 is biased by the spring 471 so as to allow the conveyance from the first conveyance path 410 and regulate the conveyance from the third conveyance path 430, but the document is conveyed from the third conveyance path 430. When the original is conveyed, it can be automatically opened and conveyed.

A third switching member 470, which is biased in one direction to enable conveyance from both sides of the first conveyance path 410 and the second conveyance path 420, is arranged in the third conveyance path 430. The 3 switching member 470 uses the spring 471 to move the first transfer path 4
The first transport path 410 is urged so that the transport from the third transport path 430 is regulated and the transport from the third transport path 430 is permitted.
When an original is conveyed from the original, the original can be automatically opened and conveyed by the conveyance of the original.

First switching member 450 and second switching member 460
The third switching member 470 can be opened and closed with the support shaft 453 of the same shaft arranged at the confluence of the first conveyance path 410, the second conveyance path 420, and the third conveyance path 430 as a fulcrum.
It is easy to secure the installation space at one place and can be downsized.

Registration roller 421 of this embodiment
Is a pair of rollers 421 for correcting the bending of the document.
a and 421b. Further, the conveyance roller 431 and the reversing roller 433 constitute a loop roller for conveying the document d and abutting the leading end of the document d against the registration roller 421. The transport roller 431 is a pair of rollers 43.
1a and 431b, and the reversing roller 433,
The original d is composed of a pair of rollers 433a and 433b, and the document d is a pair of rollers 431a and 431b and a pair of rollers 43.
It is conveyed by being sandwiched between 3a and 433b.

The original document feeder DF is shown in FIGS.
As shown in FIG. 7, registration roller driving means 880 for driving the registration roller 421, loop roller driving means 881 for driving the conveying roller 431 and the reversing roller 433 which are loop rollers, conveyance roller 431 which is a loop roller for the original, and reversing It has a roller separating / holding mechanism 883 that separates or holds the roller 433, and a control means 884 that controls the registration roller driving means 880, the loop roller driving means 881, and the roller separating / holding mechanism 883.

The roller separating / holding mechanism 883 includes an operating arm member 883a, a support shaft 883b, and a solenoid 883.
It consists of c. The operating arm member 883a has a support shaft 883.
rotatably supported by b, one arm portion 883a
1, the roller portion 433a of the reversing roller 433 is pivotally supported,
The solenoid 883c is connected to the other arm 883a2. The roller portion 433a of the reversing roller 433 is
Normally, the roller arm 433b is urged in the direction of being pinched, but by the operation of the solenoid 883c, the operation arm member 883 is operated.
a on the support shaft 883b as a fulcrum to rotate the roller portion 433a.
It is configured to release the pinching and to separate.

When the document d is transported by driving the transport roller 431 and the reversing roller 433, and the leading edge of the document d comes into contact with the registration roller 421, the document leading edge detecting means S31 causes the document d to move.
Detecting the leading edge of the sheet and sending this detection information to the control means 884. The control unit 884 controls the registration roller driving unit 880 to stop the driving of the registration roller 421 based on the detection information from the document leading edge detection unit S31, and controls the loop roller driving unit 881 after a predetermined time has elapsed to control the conveyance roller. The driving of 431 and the reversing roller 433 is stopped, and as shown in FIG. 6, the original d is looped to correct the bending of the original d.

In this way, the original document d is looped to form the original document d.
The control means 884 controls the registration roller driving means 880 to drive the registration roller 421 at a predetermined timing, and at the same time controls the loop roller driving means 881 to drive the conveying roller 431 and the reversing roller 433. Then, the document d is conveyed to the reading unit 422,
At the time of this conveyance, as shown in FIG. 7, the driving of the registration rollers 421 is restarted, and at the same time, the roller separation / nip mechanism 883 is controlled to release the nip of the reversing rollers 433 and separate them.

In this way, by restarting the driving of the registration roller 421 and releasing the nip of the reversing roller 433 and separating them at the same time, the document d can freely move when the document d is pulled by the registration roller 421. The original document d is not bent or wrinkled.

Further, the control means 884 corrects the bending of the document d by the registration roller 421, the conveyance roller 431, and the reversing roller 433 and conveys it to the reading unit 422 after restarting the driving of the registration roller 421. After a lapse of a predetermined time, the roller separating and sandwiching mechanism 883 is controlled to release the sandwiching of the reversing roller 433 and separate the rollers.

In this way, after the driving of the registration roller 421 is restarted, the reversing roller 433 is passed after a predetermined time has elapsed.
When the document d is pulled by driving the registration roller 421 by releasing the nip of the document, first, the loop state of the document d disappears, and when the loop state disappears and the pulling force acts on the document d, the reversing roller 433 moves. The original can be moved freely because the pinch is released, and the original d is bent,
There are no wrinkles.

Further, on the downstream side of the reading unit 422, a fourth switching member 490 capable of switching between the reversing unit 432 and the discharging unit 440 is provided so as to be rotatable integrally with the support shaft 493. An arm 493a is provided at one end of the support shaft 493, and an arm 493b is provided at the other end.
3a is urged by a spring 491 to open the inlet 440a of the discharge portion 440 and close the inlet 432a of the reversing portion 432. Further, the arm 493b is operated against the spring 491 by the solenoid 492, and
When 92 is operated, the inlet 440a of the discharge part 440 is closed,
The inlet 432a of the reversing unit 432 is opened.

As described above, the reversing roller 433 is composed of the pair of rollers 433a and 433b, and the document d is nipped and conveyed between the pair of rollers 433a and 433b.
The roller 433a is a driving roller, the roller 433b is a driven roller, and the driving roller and the driven roller are
It is an absorber capable of absorbing vibration shock.

The drive roller of the roller 433a of this embodiment uses a rubber material as an absorbing material, and the rubber hardness of this rubber material is 40 ° or less. The driven roller of the roller 433b uses a soft material such as a rubber material as an absorbing material.

As described above, by using the absorbing material for the driving roller of the roller 433a and the driven roller of the roller 433b, the vibration impact when the driving roller and the driven roller are separated and pinched is generated between the driving roller and the driven roller itself. It can be absorbed by the absorbent material. Therefore, with a simple structure without increasing the size and complexity of the apparatus, it is possible to reduce the vibration impact caused by the drive roller and the driven roller being separated and pinched, and it is possible to obtain a good image without image shift. Moreover, it is possible to reduce impact noise when the drive roller and the driven roller re-nip the original document d.

When reading one side of the document d in this embodiment, as shown in FIG. 8, the one side of the document d is conveyed by the one-sided paper feed path P1 in which the reading section 422 reads and discharges the document.

That is, the documents d stacked on the paper feed tray 201
Are conveyed one by one, and the first switching member 450
Since the conveyance path 430 is closed, the document d is stored in the first conveyance path 4
The sheet is conveyed to the second conveyance path 420 from 10, and the reading unit 422 reads one side of the document d. The read document d is discharged onto the discharge tray 301 through the discharge unit 440 because the fourth switching member 490 closes the inlet 432a of the reversing unit 432 and opens the inlet 440a of the discharge unit 440. To be paper.

When reading both sides of the original document d, as shown in FIG. 9, one side of the original document d is guided to the reversing unit 432 to be inverted and conveyed, and the reading unit 422 causes the reading reversing unit 4 to read.
32, and the reversing unit 432 inverts the sheet again and conveys it.
The other side of the original document d is read by the reading unit 422 and is conveyed through the double-sided paper feed path P2.

That is, the documents d stacked on the paper feed tray 201
Are separated and conveyed one by one, the solenoid 452 operates, the first switching member 450 opens the third conveyance path 430, and the document d is conveyed from the first conveyance path 410 to the third conveyance path 430. . The third switching member 470 arranged in the third transport path 430 closes the third transport path 430, but is pushed by the document d to be transported and opens against the spring 471.
It closes when the document d passes.

In the third transport path 430, the transport roller 43
1 and the reversing roller 433 of the reversing unit 432 rotate in the forward direction to carry the document d, and the conveying roller 431 and the reversing roller 43.
3 reverses and switches back the document d and conveys it.
It is conveyed from the third conveyance path 430 to the second conveyance path 420 via the switching member 460 and the third switching member 470, and the reading unit 4
22 reads one side of document d.

In the state where the document d is switched back and conveyed, the second switching member 460 and the third switching member 470.
Is in the initial position by the spring 471, and the document d transported by being switched back is guided by the third switching member 470 and pushes the second switching member 460. Second switching member 460
Is opened by being pushed by the conveyed document d, and is closed when the document d passes.

In the read document d, the solenoid 492 is actuated and the fourth switching member 490 causes the reversing section 4 to move.
32 inlet 432a is opened, and outlet 440 inlet 440
Since a is closed, it is sent to the reversing unit 432 through the inlet 432a of the reversing unit 432. Then, the transport roller 43
1 and the reversing roller 433 reversely rotate to switch back the document d and convey it. From the third conveyance path 430 to the second conveyance path 420 via the second switching member 460 and the third switching member 470.
Then, the reading section 422 reads the other side of the document d.

The original document d that has been read is the fourth
The switching member 490 closes the inlet 432a of the reversing section 432.
Since the inlet 440a of the discharge unit 440 is opened, the sheet is discharged onto the discharge tray 301 through the discharge unit 440.

The document conveying device capable of reading one side of the document d and both sides of the document d is a document in which the leading end of the document is abutted and aligned by a pair of rollers arranged upstream of the reading unit 422 and downstream of the reversing unit 432. It has a registration mechanism A, and this document registration mechanism A is composed of a registration roller 421. The document registration mechanism A is arranged upstream of the reading unit 422 and downstream of the reversing unit 432, and the pair of rollers of the document registration mechanism A align the ends of the document to align them, so that one side and both sides of the document d are bent. Corrections can be processed in one place.

A resist loop forming space SP1 that allows a loop of the originals d when aligning the originals d by the original document registration mechanism A is formed in the one-sided sheet passing path P1, and a resist loop forming space SP2 is formed in the two-sided sheet passing path P2. Then, the loop of the original document d generated when aligning the original documents by the original document registration mechanism A is set as the registration loop forming spaces SP1, SP.
By allowing 2 for the original d, it is possible to surely correct the bending of both one side and both sides of the original document d.

Further, a document position detecting means S41 is arranged on the upstream side of the document registration mechanism A, and a document position detecting means for detecting the position of the document immediately after the confluence of the one-sided sheet passing path P1 and the two-sided sheet passing path P2. By disposing S41, it is possible to detect the position of the document d on one side or both sides of the document d.

In the embodiment of the present invention, the document conveying device connected to the copying machine is shown. However, an image forming apparatus such as a printer or a facsimile, a multifunctional machine having a plurality of these functions, a light printing machine, or the like. The present invention can also be applied to a document feeder used by connecting with

[0065]

As described above, according to the first aspect of the invention, the driving roller or the driven roller is an absorbing material capable of absorbing a vibration shock, so that the apparatus becomes complicated and large in size. With such a simple structure, it is possible to reduce the vibration impact caused by the drive roller and the driven roller being separated from each other and sandwiched between them, so that a good image can be obtained, and the impact noise during re-sandwiching can be reduced.

According to the second aspect of the invention, the driving roller is made of a rubber material, and the vibration impact caused by the driving roller and the driven roller being separated from each other and sandwiched therebetween can be reduced, and a good image can be obtained. Moreover, it is possible to reduce the impact noise at the time of re-sandwiching.

According to the third aspect of the present invention, the driven roller is made of a soft material and the vibration impact due to the separation and pinching of the driving roller and the driven roller is reduced and a good image can be obtained. Moreover, it is possible to reduce the impact noise at the time of re-sandwiching.

According to the invention described in claim 4, since the document conveying device according to any one of claims 1 to 3 is provided, the device is complicated and has a simple structure without an increase in size. It is possible to reduce the vibration impact caused by the drive roller and the driven roller being separated and pinched, to obtain a good image, and to reduce the impact noise at the time of re-pinching.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of an image forming apparatus equipped with a sheet post-processing device, a document conveying device, and an image reading device.

FIG. 2 is a sectional view of a document feeder.

FIG. 3 is a plan view of a document feeder.

FIG. 4 is an enlarged view of a main part of the document feeder.

FIG. 5 is an enlarged view of a switching unit.

FIG. 6 is a diagram showing a state where a loop roller is clamped.

FIG. 7 is a diagram showing a state in which the nipping of the loop roller is released,

FIG. 8 is a diagram showing a single-sided sheet passing path.

FIG. 9 is a diagram showing a double-sided sheet passing path.

FIG. 10 is a cross-sectional view of a conventional document feeder.

[Explanation of symbols]

DF document feeder 1 Image forming device 1A Image forming apparatus main body 400 Document feeder 421 Registration roller 422 Reader 431 Conveyor roller 431a, 431b rollers 433 Reversing roller 433a, 433b rollers 880 registration roller driving means 881 Loop roller driving means 883 Roller separation pinching mechanism 884 Control means d manuscript

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Qin Fengsheng             2970 Ishikawa-cho, Hachioji-shi, Tokyo Konica Stock Association             In-house (72) Inventor Nobutaka Kato             1-7 Minamimachi, Higashi-Kurume City, Tokyo Metropolitan Government             Part 1-510 Room (72) Inventor Osamu Kato             3-1, Sakaemachi, Higashimurayama-shi, Tokyo 28             Yonekawa Mansion Room 309 (72) Inventor Keisho Ito             Asahi, 3-24, Ishihara-cho, Kawagoe City, Saitama Prefecture             Palio Kawagoe Room 406 F-term (reference) 2H076 AA04 BA24 BA35 BA36 BA42                       BA47 BA48 BA58 BA63 BA65                 3F049 CA16 DA12 DB03 EA10 LA02                       LA05 LA07 LB02                 3F053 BA03 BA19 BA27 LA01 LB02                 5C062 AA02 AA05 AB02 AB32 AD01                       BA01 BA08

Claims (4)

[Claims] 1. A drive roller and a driven roller which are arranged on a conveying path for conveying an original and which nips and conveys the original, and a roller separating and nipping mechanism for separating and sandwiching the driving roller and the driven roller. In the original document conveying device, which is configured to convey an original document to a reading unit and read the original document by the reading unit, the drive roller or the driven roller is an absorbing material capable of absorbing a vibration impact. Characteristic document feeder. 2. The document feeder according to claim 1, wherein the drive roller is made of a rubber material and has a rubber hardness of 40 ° or less. 3. The document feeder according to claim 1, wherein the driven roller is a soft material. 4. An image forming apparatus comprising the document feeding device according to any one of claims 1 to 3.