JP2003063699A - Document carrying device, and image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To carry documents to correct skew both for one-side reading and double-side reading, while achieving compactness, low cost, and high productivity. SOLUTION: This document carrying device comprises a one-side paper feeding passage P1 to carry the documents d stacked on a supply paper tray 201 to be separated and carried one by one, so that one side of the document d is read by a reading part 422 before it is discharged, and a double-side paper feeding passage P2 to introduce the document d after one side of it is read by the reading part 422 to a reading and inverting part 432, so that the other side of the document d from the inverting part 432 is read by the reading part 422 before it is discharged. One side or both sides of the document d can thus be read. A document resist mechanism A is provided comprising a pair of rollers disposed upstream of the reading part 422 and downstream of the inverting part 432, so that a tip of the document is applied to correct skew.

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, the documents stacked on a sheet feeding tray are separated and conveyed one by one, and both sides of the document can be read by a reading section. There is something like this.

As such an original conveying apparatus, as shown in FIG. 8, the originals stacked on the paper feed tray 100 are separated one by one by the separating mechanism 101, and the originals are aligned and conveyed by the registration mechanism 102. When reading one side of a document, the reading unit 103 discharges the paper from the discharge roller 104 to the discharge tray 105, and when reading both sides of the document, the switching gate 1
06a and 106b are reversed by the reversing unit 107, and one side of the document is read by the switching unit 106b and 106c.
In some cases, the document is read at 03 and reversed again at the reversing unit 107, the other side of the original is sent to the reading unit 103, and the reading unit 103 discharges the document from the sheet discharging roller 104 to the sheet discharge tray 105.

[0004]

In such an image forming apparatus, only one registration mechanism is arranged immediately after the sorting mechanism, and after the first side of one side of the original is read, the other side of the original is read. In this case, even if the originals are bent, the originals cannot be aligned and the bending of the originals cannot be corrected.

Therefore, if one registration mechanism is arranged immediately after the sorting mechanism, one registration mechanism is arranged immediately after the reading position, and a total of two registration mechanisms are arranged, a total of two registration mechanisms are arranged. However, a large space is required for the installation space, and the manufacturing cost is high.

Further, when originals of different sizes are placed on the paper feed tray for reading, the original size cannot be determined when the originals are placed on the paper feed tray. Although the size is determined, the reversing unit is arranged on the upstream side of the reading unit between the paper feed tray and the paper ejection roller, and the double-sided original is reversed before being read. This is an apparatus provided with a switching unit that divides the conveyance between the reversing unit and the reading unit, and cannot convey from the reading unit to the reversing unit. In addition, the document length detection sensor 108 is used for the separation mechanism 10.
It is arranged immediately after the position 1, and the distance between the sensor position for measuring the document size and the reading position is shorter than the A3 (420 mm) size.

Therefore, the original reaches the reading position before the original size is determined, and the copying machine main body cannot send out the transfer paper. Therefore, it is necessary to return the original document to the reading position after passing through the entrance of the discharge section and the passage of the reversing section, which takes time and lowers the productivity.

The present invention has been made in view of the above points, and is capable of correcting the bending of one side or both sides of a document, is small in size, low in cost, and has high productivity, and a document transporting device capable of transporting a document. An object is to provide an image forming apparatus.

[0009]

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

According to the first aspect of the present invention, "a single-sided paper feed path for separating and transporting originals stacked on a paper feed tray one by one and reading and discharging one side of the originals, and an original One side of the document is guided to the reading and reversing unit by the reading unit, and the other side of the document is read from this reversing unit by the reading unit and has a double-sided paper feeding path, so that one side of the document and both sides of the document can be read. In the document transporting device, the document transporting device further comprises a document registration mechanism for aligning the leading edge of the document with a pair of rollers arranged upstream of the reading unit and downstream of the reversing unit. ].

According to the first aspect of the invention, one side of the document is aligned by abutting the leading ends of the documents with a pair of rollers of the document registration mechanism arranged upstream of the reading unit and downstream of the reversing unit. Bend correction can be processed in one place on both sides, which is small and low cost.

According to a second aspect of the present invention, "Registration loop forming spaces that allow loops of a document generated when aligning the documents by the document registration mechanism are formed in the one-sided sheet passing path and the two-sided sheet passing path. The document feeder according to claim 1, wherein ].

According to the second aspect of the present invention, by allowing the loop of the original document generated when aligning the original document by the original document registration mechanism in the registration loop forming space, it is possible to surely correct the bending of one side or both sides of the original document. .

According to a third aspect of the present invention, "a document position detecting means for detecting the position of the document is arranged immediately after the confluence of the one-sided sheet feeding path and the two-sided sheet feeding path. The document feeder according to claim 1 or 2. ].

According to the third aspect of the invention, the document position detecting means arranged immediately after the confluence of the one-sided sheet feeding path and the two-sided sheet feeding path detects the position of the document on one side or both sides of the document. be able to.

According to a fourth aspect of the invention, "the originals stacked on the paper feed tray are separated and conveyed one by one, and the first upstream side
It has a conveyance path, a second conveyance path branched to the downstream side, and a third conveyance path. The original is conveyed from the first conveyance path to the second conveyance path, and one side of the original is read by the reading unit and discharged. , The document is conveyed from the first conveyance path to the third conveyance path and inverted, and is conveyed from the third conveyance path to the second conveyance path so that one side of the document is read by the reading unit and the third conveyance path is read again. The document is conveyed so as to be reversed, and then conveyed from the third conveyance path to the second conveyance path to read and eject the other side of the document at the reading unit, and to convey one side of the document and both sides of the document. The device has a first switching member that can switch between the second transport path and the third transport path on the downstream side from the first transport path, and the forward and reverse directions of the second transport path and the third transport path are provided. A pair of rotatable conveyance rollers is provided, and the second conveyance path includes the first conveyance path and the third conveyance path. A second switching member that is urged in one direction to enable conveyance from the side, and the third conveyance path allows conveyance from both sides of the first conveyance path and the second conveyance path. An original conveying device comprising a third switching member biased in one direction. ].

According to the invention of claim 4, the second
Since it is possible to switch back from the conveyance path to the third conveyance path, when the document size is detected, the reading operation can be performed directly without passing through the reading unit and re-reading, and the document can be conveyed with high productivity. .

According to a fifth aspect of the present invention, "the first switching member, the second switching member and the third switching member can be opened and closed with the same shaft as a fulcrum. The document feeder according to item 1. ].

According to the invention of claim 5, the first
The switching member, the second switching member, and the third switching member can be opened / closed with the same shaft as a fulcrum, and it is easy to secure a space for arrangement at one location, and the size can be reduced.

The invention according to claim 6 provides the "claim 1
An image forming apparatus comprising the document conveying device according to claim 5. ].

According to the sixth aspect of the invention, it is possible to correct the bending of one side or both sides of the document, and it is possible to carry the document with a small size and low cost and high productivity.

[0022]

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.

The 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 the image on one side or both sides of the document is 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, the cassette sheet feeding section 6 is located below the image forming apparatus main body 1A in the height direction with the image forming section 4 being the center, and the fixing device is located above the fixing apparatus. 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 formed 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 main body 1A of the image forming apparatus 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 feeder, FIG. 3 is a plan view of the 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, and FIG. FIG. 7 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 regulating plates 202 for positioning the document in the sheet width direction are movable in the sheet width direction. It is provided in. Further, in the paper feed tray 201, a document placement detecting means S1 for detecting the placement state of each 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 document 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.

In the second transport path 420, the registration rollers 4
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 conveying roller 424 can rotate in the forward and reverse directions.

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.

Further, 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 urged 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, 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.

Further, on the downstream side of the reading section 422, a fourth switching member 490 capable of switching between the reversing section 432 and the discharging section 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.

When reading one side of the document d in this embodiment, as shown in FIG. 6, the one side of the document d is conveyed by the one-sided paper feed path P1 through which the reading unit 422 reads and discharges the sheet.

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. 7, one side of the original document d is guided to the reversing unit 432 to be reversed and conveyed, and the reading unit 422 reads and reverses the reading unit 4.
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 original 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 operated 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 original document conveying apparatus capable of reading one side of the original document d and both sides of the original document d is a document in which the front end of the original document is abutted 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. The correction can be processed in one place, which is small and low cost.

A resist loop forming space SP1 for allowing a loop of the originals d when aligning the originals d by the original document registration mechanism A is formed in the single-sided sheet passing path P1, and a resist loop forming space SP2 is formed in the double-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 in 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 detects the position of the document just after the confluence of the single-sided sheet feeding path P1 and the double-sided sheet feeding 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 addition, in this embodiment, the first transport path 4
Second transport path 420 and third transport path 430 on the downstream side from 10
Has a first switching member 450 that can be switched to, and the second transport path 420 includes a first transport path 410 and a third transport path 430.
Is provided with a second switching member 460 that is urged in one direction to enable conveyance from both sides of the third conveyance path 430.
There is provided a third switching member 470 that is urged in one direction to enable conveyance from both sides of the first conveyance path 410 and the second conveyance path 420.

Further, the registration roller 421, the reading and pressing roller 423, and the carrying roller 424 arranged in the second carrying path 420 are a pair of carrying rollers which can rotate in the forward and reverse directions.
Further, the transport roller 431 arranged in the third transport path 430 and the reversing roller 433 of the reversing unit 432 are a pair of transport rollers capable of normal and reverse rotation, and the paper discharge roller 441 of the discharge unit 440 is also a pair of normal reverse rotation. It is a conveyance roller.

When originals d of different sizes are placed on the paper tray 201 for reading, the original size cannot be determined when the originals d are placed on the paper tray 201.
The document is conveyed from the conveyance path 410 to the second conveyance path 420, and the document length detection means S21 determines the document size.

When the determination of the original size is completed, the second
The registration roller 421, the reading and pressing roller 423, and the conveyance roller 424 arranged on the conveyance path 420 are reversely rotated, and the paper discharge roller 441 of the discharge unit 440 is also reversely rotated.
The conveyance roller 431 and the reversing roller 433 of the reversing unit 432 arranged in the conveyance path 430 are reversed to return the document d from the second conveyance path 420 to the third conveyance path 430. Then, the transport roller 431 and the reversing unit 4 arranged in the third transport path 430.
The reverse roller 433 of 32 is rotated in the normal direction, and the registration roller 421 and the reading and pressing roller 42 arranged on the second transport path 420 are rotated.
3 and the transport roller 424 are rotated in the normal direction, and further the discharge unit 440
The paper discharge roller 441 also rotates forward and switches back,
The sheet is conveyed from the conveyance path 430 to the second conveyance path 420, and the reading unit 4
At 22, the document d is read.

In this way, since it is possible to switch back from the second conveyance path 420 to the third conveyance path 430, when the document size is detected, a direct reading operation is performed without passing through the reading unit 422 and re-reading. You can do it again, and once again, after passing through the discharge section entrance and the reversing section,
It is not necessary to return the document to the reading position, the document can be conveyed quickly, and the document can be conveyed with high productivity.

In the embodiment of the present invention, the document conveying apparatus connected to the copying machine is shown, but 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

[0064]

As described above, according to the first aspect of the invention, the front end of the original is abutted and aligned by the pair of rollers of the original registration mechanism arranged upstream of the reading section and downstream of the reversing section. Bending correction can be processed on one side and both sides of a document at one place, and the size and cost are small.

According to the second aspect of the invention, by allowing the loop of the original document generated when aligning the original document by the original document registration mechanism in the registration loop forming space, it is possible to surely correct the bending of one side or both sides of the original document.

According to the third aspect of the invention, the document position detecting means arranged immediately after the confluence of the single-sided sheet feeding path and the double-sided sheet feeding path can detect the position of the document on one side or both sides of the document. .

According to the fourth aspect of the present invention, since it is possible to switch back from the second conveyance path to the third conveyance path, when the document size is detected, the document is not passed through the reading unit and re-read.
Direct reading operation can be performed, and highly productive document transportation can be performed.

In the invention according to claim 5, the first switching member, the second switching member and the third switching member can be opened and closed with the same shaft as a fulcrum, and it is easy to secure a space for arrangement at one location. Can be miniaturized.

According to a sixth aspect of the invention, one side of the original is
Curvature correction is possible on both sides, and it is compact, low-cost, and highly productive for document conveyance.

[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 single-sided sheet passing path.

FIG. 7 is a diagram showing a double-sided sheet passing path.

FIG. 8 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 201 paper tray 422 Reader 432 Inversion section A Document registration mechanism P1 single-sided paper path P2 double-sided paper path

Continued front page    (72) Inventor Qin Fengsheng             2970 Ishikawa-cho, Hachioji-shi, Tokyo Konica Stock Association             In-house (72) Inventor Osamu Kato             3-1, Sakaemachi, Higashimurayama-shi, Tokyo 28             Yonekawa Mansion Room 309 (72) Inventor Nobutaka Kato             1-7 Minamimachi, Higashi-Kurume City, Tokyo Metropolitan Government             Part 1-510 Room (72) Inventor Keisho Ito             Asahi, 3-24, Ishihara-cho, Kawagoe City, Saitama Prefecture             Palio Kawagoe Room 406 F-term (reference) 2H076 BA24 BA30 BA31 BA42 BA49                       BB04 BB05                 3F102 AA07 AA10 AA11 AB01 BA02                       BA06 BA11 BB02 CA00 CB01                       CB02 DA08 EA02 EC04 FA07                 5B047 AA01 BA01 BA07 BB02 BC18                       CA09                 5C062 AA05 AB02 AB22 AB29 AC11                       AC66 AD06 BA01                 5C072 AA01 BA01 BA05 EA05 NA01                       NA04 RA04 WA02 XA01

Claims (6)

[Claims] 1. A single-sided paper feeding path for separating and transporting originals stacked on a paper feed tray one by one and reading and discharging one side of the originals, and one side of the originals is read and inverted by the reading section. In the document feeding device, which has a double-sided paper feeding path for guiding the other side of the document from the reversing unit to the reading unit and discharging the document, the document feeding device capable of reading one side of the document and both sides of the document. A document transporting device, comprising a document registration mechanism that aligns the document front ends by a pair of rollers arranged upstream of the section and downstream of the reversing section. 2. A registration loop forming space for allowing a loop of a document produced when aligning documents by the document registration mechanism is formed in the one-sided sheet passing path and the two-sided sheet passing path. 1. The document feeder according to 1. 3. The document position detecting means for detecting the position of a document is arranged immediately after the confluence of the one-sided sheet feeding path and the two-sided sheet feeding path. Document feeder. 4. An original stacked on a paper tray is separated and conveyed one by one, and has a first conveying path on the upstream side, a second conveying path branched to a downstream side, and a third conveying path. Then, the document is transported from the first transport path to the second transport path, one side of the document is read by the reading unit and discharged, and the document is transported from the first transport path to the third transport path and inverted, The document is conveyed from the third conveyance path to the second conveyance path, one side of the document is read by the reading unit, conveyed again to the third conveyance path and inverted, and then conveyed from the third conveyance path to the second conveyance path. In a document feeding device capable of reading and ejecting the other side of the document by the reading unit and reading one side of the document and both sides of the document, the second feeding path and the third feeding path downstream from the first feeding path.
A first switching member that is switchable to a transport path, a pair of transport rollers that can rotate forward and backward in the second transport path and the third transport path, and the second transport path includes the first transport member. 1 transport path and the third
A second switching member that is biased in one direction to enable conveyance from both sides of the conveyance path is provided, and the first conveyance path and the second conveyance path are provided in the third conveyance path.
An original conveying apparatus comprising a third switching member that is biased in one direction to enable conveyance from both sides of a conveyance path. 5. The document feeder according to claim 4, wherein the first switching member, the second switching member, and the third switching member can be opened and closed with the same shaft as a fulcrum. 6. An image forming apparatus comprising the document feeding device according to any one of claims 1 to 5.