JP2001348130A - Paper sheet carrier device, document reader, and image formation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper sheet carrier device having a mechanism of stopping and aligning the tip of the paper sheet to be set and having reliability not obstructing the carrier of the paper sheet. SOLUTION: In a stand-by state, a shutter 22 stops by a lock operation of a one-way clutch for the shutter and prevents the tip of a document D from entering into the inside by the stopper 22a. When starting the carrier operation, a gear 24 rotationally moves in the document carrier direction by receiving the driving force from a drive source, this rotation makes the one-way clutch for the feed roller to connect the feed roller 6 to the rotary driving shaft 23. Thereby, the rotation drive force is transmitted to the feed roller 6 so that the feed roller 6 starts to rotate in the document carrier direction. On the other hand, this rotation releases the shutter 22 from the lock operation of the one- way clutch for the shutter and the stopper part 22a reaches the position of a lower stopper position 30 from the document carrier passage and stops.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scanner, a facsimile, a copying machine, a printer, and a multifunction machine for automatically separating recording paper and originals.
The present invention relates to a paper transport device used for feeding, and more particularly to a paper transport device capable of aligning the leading edge of a paper in a set state of paper, and further relates to a document reading device and an image forming device equipped with the paper transport device. .

[0002]

2. Description of the Related Art Conventionally, in a facsimile apparatus, a document reading section for reading document information is provided with a document separating / conveying device for automatically conveying documents one by one to a reading sensor. One problem with this document separation and feeding device is that the separation performance varies depending on the setting state of the document by the user. Specifically, a plurality of stacked documents are placed in the opening for document setting. If the document is strongly inserted, the leading edge of the document will pass through the action portion of the member that separates the document, and a double feed will occur without an appropriate separating operation.

[0003] In an electrophotographic image forming unit such as a facsimile apparatus, there is a problem that the state of image formation on a recording sheet varies depending on the setting state of the recording sheet by a user. For example, the recording paper may be manually set by a user. At this time, if the recording paper is strongly inserted into the recording paper setting opening, the leading edge of the recording paper may become an electrophotographic image. An image is not formed at an appropriate timing because the nip is not satisfactorily nipped by a pair of registration rollers that convey the recording paper at a timing with respect to the photoconductor of the forming unit.

For this reason, in the document separating and conveying apparatus, as disclosed in Japanese Patent No. 2859047 and Japanese Patent Application Laid-Open No. 7-187429, the document separating / transporting apparatus is installed so as to be capable of entering and leaving a document setting section, and an opening for document setting is set when a document is set. There is a configuration in which a shutter for closing is provided to abut on the leading edge of a document when the document is set, thereby preventing excessive insertion by a user.

[0005]

However, the shutter mechanism in the document separating / conveying apparatus having the above-described structure is provided with a shutter for abutting the leading edge of the document set on the document setting section and adjusting the shutter. There is a problem that the overall configuration is complicated, the number of parts is large, and a large occupied space is required accordingly.

The present invention solves the above-mentioned conventional problems, has a simple and inexpensive configuration, has a function of stopping and adjusting the leading edge of a sheet to be set, and has a reliability that does not hinder sheet conveyance. It is an object of the present invention to provide a paper transport device, a document reading device equipped with the paper transport device, and an image forming device.

[0007]

In order to achieve the above object, according to the present invention, a position between a position contacting a leading end of a sheet bundle stacked on a sheet setting section and a position not contacting a sheet is set. A paper end stopper member rotatably provided;
In a paper transport device including a rotary roller configured to transport a sheet in a predetermined transport direction, a rotary drive shaft on which the rotary roller and the paper leading end stopper member are loosely fitted, and a paper feed direction relative to the rotary drive shaft. A driving member capable of transmitting a rotational driving force in a certain forward direction and a reverse direction opposite to the sheet conveying direction, and when the rotational driving force in the forward direction is transmitted to the rotational drive shaft, A first one that enables the rotary roller to rotate with the rotary drive shaft and causes the rotary roller to idle with respect to the rotary drive shaft when the rotary drive force in the reverse direction is transmitted. A direction clutch, and when the rotation driving force in the forward rotation direction is transmitted to the rotation driving shaft, the sheet leading end stopper member is brought into an idling state with respect to the rotation driving shaft, and the rotation driving force in the reverse rotation direction is reduced. Conveyed And a second one-way clutch that enables the rotary drive shaft and the paper leading end stopper member to rotate together. With this configuration, the paper transport by the rotating roller and the paper leading end stopper are provided. The first and second one-way clutches reliably stop and adjust the leading edge of the sheet by the member, and do not require a large installation space.

According to a second aspect of the present invention, in the sheet transporting apparatus according to the first aspect, all of the rotating roller, the sheet leading end stopper member, the first one-way clutch and the second one-way clutch are connected to the rotary drive shaft. It is characterized in that it is installed. With this configuration, the main constituent members are installed on one shaft, so that the configuration is simplified as a whole and the configuration can save space.

The invention described in claim 3 is the first or second invention.
In the paper transport apparatus described above, a coil spring type one-way clutch is used for at least one of the first one-way clutch and the second one-way clutch.

[0010] The invention according to claim 4 is the invention according to claim 1 or 2.
In the paper transport device described above, at least one of the first one-way clutch and the second one-way clutch,
A ratchet type one-way clutch is used.

The invention according to claim 5 is the first or second invention.
In the above-described paper transport apparatus, a bearing-type one-way clutch is used for at least one of the first one-way clutch and the second one-way clutch.

The invention according to claim 6 is the first or second invention.
The paper transport device according to claim 1, further comprising a first stopper portion that locks the paper leading edge stopper member at the position when the paper leading edge stopper member rotates to a position at which the paper can be transported. With this configuration, it is possible to reliably hold the sheet leading end stopper member at a position that does not hinder sheet conveyance.

According to a seventh aspect of the present invention, in the paper transport apparatus of the first aspect, the paper leading end stopper member is rotated to the first stopper portion of the sixth aspect, so that the rotation drive shaft is rotated in the normal rotation direction. When the rotational driving force is transmitted, the paper leading end stopper member is caused to idle with respect to the rotary driving shaft by the second one-way clutch, and with this configuration, the paper leading end stopper member is rotated by the rotational driving shaft. , And easily moves to the first stopper portion under the influence of the light rotation load, the weight of the sheet leading end stopper member, or the sheet conveying force.

According to an eighth aspect of the present invention, in the paper transport device according to the first, second or sixth aspect, when the sheet leading end stopper member is rotated to a position where it contacts the leading end of the sheet, the sheet leading end stopper is held at the position. A second stopper portion for locking the member is provided. With this configuration, the sheet leading end stopper member can be stopped at the leading end of the sheet, and can be reliably held at a position where the sheet is adjusted.

According to a ninth aspect of the present invention, in the paper transporting device of the first aspect, since the sheet leading end stopper member is rotated to the second stopper portion of the eighth aspect, the rotational driving force in the reverse rotation direction is reduced. When transmitted, the second one-way clutch causes the rotation drive shaft and the sheet leading end stopper member to rotate together.

According to a tenth aspect of the present invention, in the paper transporting apparatus according to the first aspect, the amount of rotation of the paper leading end stopper member from a position at which the paper can be transported to a position at which the paper leading end comes into contact with the leading edge of the paper is preset. In this case, the rotation in the reverse direction is regulated by the driving member. With this configuration, the sheet leading end stopper member abuts on the leading end of the sheet without providing the second stopper portion according to claim 8 or 9. It can be rotated and held up to the contact position.

The eleventh aspect of the present invention provides the first to tenth aspects.
5. The sheet conveying device according to claim 1, wherein the rotating roller contacts a sheet bundle set on the sheet setting table and rotates in a sheet conveying direction, and the sheet conveying device contacts the sheet feeding roller to rotate the sheet bundle. And a friction separating member for applying a force in a direction opposite to the direction, and a feed roller in a sheet separating and conveying device for separating and conveying the sheets one by one from the sheet bundle. It is possible to prevent the paper from being excessively inserted into the nip portion between the roller and the friction separating member, and to improve the paper separating function.

The invention according to claim 12 is the invention according to claims 1 to 10
In the paper transport apparatus according to any one of the above, the rotation roller is a registration roller that transports the paper to the photoconductor at a timing, characterized by this configuration,
The paper can be prevented from being excessively inserted into the nip portion of the registration roller, and the registration function in image formation can be improved.

According to a thirteenth aspect of the present invention, there is provided a feed roller which rotates in the direction of document transport by contacting a document bundle set on a document set table; A document separating / conveying unit including a friction separating member for applying a force in an opposite direction, for separating and conveying documents one by one from the document bundle, and a document for conveying a document fed from a feed roller to a reading sensor In a document reading device in which a conveyance roller is installed in a document conveyance path,
12. The feed roller is a rotating roller.
According to this configuration, it is possible to prevent the document from being excessively inserted into the nip portion between the feed roller and the friction separating member in the document separating and conveying unit. Since the document separation function can be improved, the reliability of automatic reading of document information is improved.

According to a fourteenth aspect of the present invention, there is provided a paper feed roller for feeding paper from a paper cassette loaded with paper, a transport roller for transporting paper fed from the paper feed roller, and an image forming unit. 11. An image forming apparatus in which a registration roller for feeding a sheet at a time and a discharge roller for discharging the sheet out of the apparatus are provided in a sheet conveyance path, wherein the registration roller is a rotating roller. 12. The paper transport device according to any one of the above items 12 is mounted, and with this configuration, it is possible to prevent the paper from being excessively inserted into the nip portion of the registration roller, and to improve the registration function in image formation. Therefore, the reliability of image formation on paper is improved.

[0021]

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

FIG. 1 is a view showing the overall arrangement of a facsimile apparatus for explaining a first embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a document reading unit provided on an upper part of an apparatus main body 2; Electrophotographic image forming apparatus section installed in the section,
Reference numeral 4 denotes a paper feed cassette in which sheets P as recording paper such as plain paper are stacked and stored.

In the original reading unit 1, reference numeral 5 denotes an original setting unit on which the originals D are stacked; 6, a feed roller for feeding out and transporting the lowermost sheet of the originals D; 7; A friction pad, which is a friction separating member that separates and feeds the documents one by one by contacting through
Denotes a reading sensor for optically reading document information, 9 denotes a white roller for pressing and transporting the document against the reading sensor 8, 1
Reference numeral 0 denotes a pair of upper and lower original transport rollers which are installed upstream of the reading sensor 8 in the original transport direction and transport the original at a predetermined speed with respect to the reading sensor 8. This is the document output tray to receive.

In the image forming apparatus section 3, reference numeral 12 denotes a photoreceptor unit having a photoreceptor 13 as a main constituent member and including a toner cartridge, 14 denotes a transfer charger installed opposite to the photoreceptor 13, and 15 denotes a photoreceptor 13 Transfer charger 1
A registration roller for feeding the paper P with a timing to the nip portion 4, a fixing unit 16 for fixing a toner image to the paper P after transfer, and a discharge unit 17 for the paper P after the fixing process The discharge rollers 18 are discharge trays for receiving the sheets P discharged to the outside by the discharge rollers 17. Also,
Reference numeral 19 denotes an optical system that emits a laser beam L that exposes the surface of the photoconductor 13 to form a latent image based on image data.

FIG. 2 is an enlarged cross-sectional view of the document reading unit. Reference numerals 20 and 21 denote an upper guide plate and a lower guide plate for transporting and guiding the document D, and reference numeral 22 denotes a shutter as a sheet leading end stopper member. In this state, when the stopper 22a projects from the lower guide plate 21,
The leading end of the bundle of documents D set near the nip between the feed roller 6 and the friction pad 7 is received and the leading end shape is adjusted. 23 is a feed roller 6
And a rotary drive shaft loosely fitted to the base 22b of the shutter 22.

Feed roller 6 and friction pad 7
The document D fed from the document separating / feeding unit is guided between the upper guide plate 20 and the lower guide plate 21 as it is,
The document D is transported by a pair of upper and lower document transport rollers 10 to a nip between a reading sensor 8 and a white roller 9 located above the reading line of the reading sensor 8 and having a document reading white reference and sheet transport / discharge function. Then, the document information is read by the reading sensor 8 and discharged to the document discharge tray 11 outside the apparatus.

FIGS. 3 and 4 are perspective views showing a detailed configuration of a shutter mechanism provided on a rotary drive shaft for fixing the feed roller according to the first embodiment. FIG. 3 is an assembled state of each component of the shutter mechanism. FIG. 4 is an exploded perspective view of the shutter mechanism, and FIG. 5 is an exploded side view showing the shutter mechanism.

In FIGS. 3 to 5, a gear 24 receives a rotational driving force from a driving source such as a motor via a group of gears and rotationally drives the rotary driving shaft 23. As shown in FIG. Both trunk portions 6a, 24 of the roller 6 and the gear 24
a, and when the gear 24 rotates in the document conveying direction (the direction of the arrow A), the gear 24 is tightened and connected,
When the rotational driving force is transmitted to the feed roller 6 to rotate in the transport direction (the feed roller 6 and the rotary drive shaft 23 rotate), and when the gear 24 rotates in the reverse direction B with respect to the transport direction A, The roller 6 is a rotary drive shaft 23
The coil spring type one-way clutch 26 is configured to rotate the feed roller 6 in the reverse direction (the direction of the arrow B) with a set torque by generating a slipping state or a sliding torque with respect to the feed roller 6. When the rotational driving force transmitted from the shutter 22 is rotated in the transport direction A, the rotational driving force is not transmitted, and the shutter 22 is caused to idle with respect to the rotational driving shaft 23. When the rotational driving force is rotated in the reverse direction B, the rotational driving force is reduced. A ratchet-type one-way clutch 2 configured to transmit the power so as to rotate the shutter 22 and the rotary drive shaft 23 together.
6. The gear 24, the coil spring type one-way clutch 25 and the ratchet type one-way clutch 26 are provided coaxially with the rotary drive shaft 23.

One tooth 27 on the feed roller 6 side of the ratchet type one-way clutch 26 is connected so as to be rotated by a drive projection 28 provided on the side of the feed roller 6, and further provided on the shutter 22. The rotational driving force is transmitted by meshing with the other tooth 29.

The operation of the first embodiment will be described below.

First, in a standby state in which the driving source is not operating, as shown in FIG.
a protrudes between the upper guide plate 20 and the lower guide plate 21 so that the leading end of the document D set by the user contacts the feed roller 6 near the nip between the feed roller 6 and the friction pad 7. The document is stopped at the contact position, and the shape of the leading end of the entire bundle of documents D is adjusted.

FIG. 6 shows the state of each member on the rotary drive shaft 23 at this time. In this state, one tooth 27 of the ratchet type one-way clutch 26 is
When the user tries to push in the document D, the torque due to the pushing force is applied to the shutter 22 and the ratchet type one-way clutch 2.
6, the feed roller 6, the coil spring type one-way clutch 25, and the gear 24 are transmitted in this order. Here the gear 24
Is locked by the detent torque of the inactive drive source because it is connected to the drive source. Therefore, the stopper portion 22a of the shutter 22 is held upright. Whether or not the shutter 22 rotates and the stopper portion 22a falls can be adjusted by setting the slip torque of the coil spring type one-way clutch 25.

Next, the opening operation of the shutter 22 when the document is transported (how the stopper 22a falls down) will be described.

As described above, the shutter 22 is in the upright state in the state shown in FIG.
a, the intrusion of the leading end of the original D into the inside is stopped, but when the conveyance start operation starts, the gear 24 rotates by receiving the driving force from the driving source, and the one-way coil spring type clutch 25 6 and a gear 24,
Tightly coupled to 24a. As a result, the rotational driving force is transmitted to the feed roller 6, and the feed roller 6 starts rotating in the document conveying direction. Feed roller 6
, The meshing of the teeth 27 and 29 of the ratchet type one-way clutch 26 is released as shown in FIG.

The shutter 22 released from the engagement of the teeth 27 and 29 in the ratchet type one-way clutch 26
Is completely free torque, and the document D conveyed by the feed roller 6 is turned down by the lowermost sheet, and the stopper portion 22a of the shutter 22 is moved between the upper guide plate 20 and the lower guide plate 21. From the transport path, and reaches the position of the lower stopper 30 shown in FIG. 2, and is locked, so that the document can be transported.

Next, a description will be given of a return (initialization) operation when the document conveyance is completed and the process returns to the standby state.

When returning to the standby state after the paper conveyance is completed,
When the gear 24 rotates in the direction B opposite to the document conveying direction by the drive source, the driving force is transmitted in the order of the gear 24, the coil spring type one-way clutch 25, the feed roller 6, the ratchet type one-way clutch 26, and the shutter 22. The shutter 22 rotates in the reverse direction B. At this time, the transmission of the driving force from the ratchet type one-way clutch 26 to the shutter 22 is performed by the released ratchet type one-way clutch 2.
As shown in FIG. 6, the teeth 27 and 29 in FIG.

By a series of these returning operations, the shutter 22 rotates from the position of the lower stopper 30, and the stopper 22a rises. When the shutter 22 reaches the document standby position, the stopper 22a of the shutter 22 reaches the position of the upper stopper 31 formed on the upper guide plate 20, and is locked, as shown in FIG. Here, the driving of the shutter 22 in the reverse direction is performed without locking the driving source by the arbitrarily set slip torque in the coil spring type one-way clutch 25 as described above, and the shutter 22 returns to the standby position. Can be.

FIG. 8 is a sectional view showing a main part of a document reading apparatus for explaining a second embodiment of the present invention. FIGS. 9 and 10 are provided on a rotary drive shaft for fixing a feed roller in the second embodiment. 9 is a perspective view showing a detailed configuration of the shutter mechanism, FIG. 9 is a perspective view showing an assembled state of each component of the shutter mechanism, and FIG. 10 is an exploded perspective view of the shutter mechanism. Members corresponding to those described above are denoted by the same reference numerals, and detailed description is omitted.

The first embodiment differs from the first embodiment in that a coil spring type one-way clutch 25 and a ratchet type one-way clutch 26 are used as the one-way clutch in the first embodiment. Although the example has been described, in the second embodiment, a bearing-type one-way clutch 35 as shown in FIG. 11 is used.

FIG. 11A shows a state in which the bearing type one-way clutch 35 is locked (rotated) with respect to the rotary drive shaft 23, and FIG. FIG. 3 is an explanatory view in a free state (idling state) with respect to a plurality of compartments 3 inside a hollow case 36. FIG.
7 is formed, and a roller 38 that contacts the rotary drive shaft 23 is pressed in one side by receiving the urging force of the spring 39 in each of the compartments 37. In the state shown in FIG.
An inclined surface 40 is formed so as to protrude so as to push the actuator 8 toward the rotary drive shaft 23.

The bearing type one-way clutch 3 of this configuration
As shown in FIGS. 9 and 10, a hollow case 3 is provided inside each of the feed roller 6 and the shutter 22.
6 is fixed so that the outer periphery 36 a thereof is fitted, and the rotary drive shaft 23 is fitted into the hollow hole 36 b of the hollow case 36 so as to be in contact with the roller 38. The related operation of the feed roller 6 and the shutter 22 and the rotating state and the idling state of each bearing type one-way clutch 35 is the one-way clutch described in the first embodiment, that is, the coil spring type one-way clutch. 25 and the operation of the ratchet type one-way clutch 26.

The second embodiment is different from the first embodiment in that the stopper 22a is locked by the upper stopper 31 at the standby position of the shutter 22 in the first embodiment. However, in the second embodiment, when the shutter 22 returns to the standby position from the lower stopper 30 and the gear 24 rotates in the direction B opposite to the document conveying direction by the driving source, By controlling the rotation of a motor (not shown) as a drive source, the rotation of the rotation drive shaft 23 by the gear 24, that is, the rotation angle α of the shutter 22, is controlled as shown in FIG.
2a projects between the upper guide plate 20 and the lower guide plate 21,
In addition, the leading end of the document D set by the user is stopped to stop and be held at a position where the leading end shape of the entire bundle of the documents D is adjusted.

For this reason, in the second embodiment, it is not necessary to install the upper stopper 31 in the first embodiment, and further, by controlling and controlling the rotation angle α of the shutter 22, the stopper 22a of the shutter 22 can be moved. It can be reliably returned to the predetermined standby position.

The one-way clutches 25, the ratchet-type one-way clutch 26, and the bearing-type one-way clutch 35, which are the one-way clutches used in the first and second embodiments, are limited to the above-described use modes. Instead, a device that is suitable for each installation site according to the specifications of the device and setting conditions is appropriately selected and used.

Further, the present invention is not limited to the apparatus described in the above embodiment, but is adopted as a configuration related to a transport roller installed at a site where the leading edge of the paper needs to be adjusted when transporting a paper such as a recording paper. can do. For example, in the image forming apparatus of the electrophotographic type shown in FIG. Can be

In this manner, for example, in a sheet transport mechanism in which a user can manually insert a sheet by hand, the leading end of the sheet is moved by the shutter 22 described in the first and second embodiments. It can be stopped and adjusted by the stopper portion 22a. For this reason, it is possible to prevent the paper from being excessively inserted into the registration roller 15, and thus the registration operation can be performed favorably, and the quality of the image formed on the paper can be maintained.

[0048]

As described above, according to the present invention,
In transporting paper such as a manuscript or a recording paper, in a portion where the leading edge of the paper needs to be adjusted, the transport of the paper by a rotating roller at that portion and the stop and trimming of the leading edge of the paper by a paper leading edge stopper member are first and second. The second one-way clutch surely performs the operation, and can be realized with a simple configuration without requiring a large installation space. Therefore, the entire apparatus can be configured at a low cost and space can be saved. The practical effect is great, such as being able to do.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a facsimile apparatus for describing a first embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view illustrating a document reading unit according to the first embodiment;

FIG. 3 is a perspective view showing an assembled state of components of a shutter mechanism provided on a rotation drive shaft for fixing a feed roller in the first embodiment.

FIG. 4 is an exploded perspective view of the shutter mechanism shown in FIG. 3;

FIG. 5 is an exploded side view showing the shutter mechanism shown in FIG. 3;

FIG. 6 is an explanatory diagram showing a rotating state of the ratchet type one-way clutch in the first embodiment.

FIG. 7 is an explanatory diagram showing an idle state of the ratchet type one-way clutch in the first embodiment.

FIG. 8 is a cross-sectional view illustrating a main part of a document reading apparatus according to a second embodiment of the invention.

FIG. 9 is a perspective view showing an assembled state of components of a shutter mechanism provided on a rotary drive shaft for fixing a feed roller according to a second embodiment.

FIG. 10 is an exploded perspective view of the shutter mechanism shown in FIG. 9;

FIG. 11 is a diagram illustrating the configuration and operation of a bearing-type one-way clutch according to a second embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Document reading unit 3 Image forming unit 6 Feed roller 7 Friction pad 13 Photoreceptor 15 Registration roller 20 Upper guide plate 21 Lower guide plate 22 Shutter 22a Stopper unit 23 Rotation drive shaft 24 Gear 25 Coil spring type one-way clutch 26 Ratchet Type one-way clutch 30 Lower stopper part 31 Upper stopper part 35 Bearing type one-way clutch D Document P Paper

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) HE07 HE12 JC11 JC17 KB05 KB15 LA02 LA04 LA13 LC13 LC16 LC21 LC25 LD29 MB14 MC04 MC20 MC27

Claims (14)

[Claims] A sheet leading end stopper member rotatably provided between a position contacting a leading end of a sheet bundle stacked on a sheet setting section and a position not contacting a sheet; A rotary drive shaft on which the rotary roller and the sheet leading end stopper member are loosely fitted; a normal rotation direction that is a paper transport direction with respect to the rotary drive shaft; A driving member capable of transmitting a rotational driving force in a reverse rotation direction opposite to the transport direction; and when the rotation driving force in the normal rotation direction is transmitted to the rotation driving shaft, the rotation roller and the rotation A first one-way clutch that enables co-rotation with a drive shaft and causes the rotation roller to idle with respect to the rotation drive shaft when the rotation drive force in the reverse rotation direction is transmitted; Drive shaft When the rotational driving force in the reversing direction is transmitted, the paper leading end stopper member is set to the idling state with respect to the rotational driving shaft, and when the rotational driving force in the reversing direction is transmitted, A second one-way clutch that enables the paper leading end stopper member to rotate together with the paper leading end stopper member. 2. The rotating drive shaft according to claim 1, wherein all of the rotating roller, the sheet leading end stopper member, the first one-way clutch, and the second one-way clutch are provided on the rotary drive shaft. Paper transport device. 3. The paper according to claim 1, wherein a coil spring type one-way clutch is used as at least one of the first one-way clutch and the second one-way clutch. Transport device. 4. The paper transport according to claim 1, wherein a ratchet type one-way clutch is used for at least one of the first one-way clutch and the second one-way clutch. apparatus. 5. The paper transport according to claim 1, wherein a bearing-type one-way clutch is used as at least one of the first one-way clutch and the second one-way clutch. apparatus. 6. A method according to claim 1, further comprising the step of: providing a first stopper portion for locking said sheet leading end stopper member at said position when said sheet leading end stopper member is rotated to a position at which a sheet can be transported. The sheet transport device according to claim 1, wherein: 7. The rotation of the sheet leading end stopper member to the first stopper portion according to claim 6, wherein when the rotation driving force in the forward rotation direction is transmitted to the rotation driving shaft,
2. The sheet transport device according to claim 1, wherein the second one-way clutch causes the sheet leading end stopper member to idle with respect to the rotation drive shaft. 8. A second stopper portion for locking the sheet leading end stopper member at the position when the sheet leading end stopper member rotates to a position where it contacts the leading end of the sheet. Any one of claims 1, 2 and 6
Paper transport device according to the item. 9. The second one-way clutch according to claim 8, wherein the second one-way clutch is used to rotate the sheet leading end stopper member up to the second stopper portion when a rotational driving force in a reverse rotation direction is transmitted. 2. The sheet conveying device according to claim 1, wherein the rotation driving shaft and the sheet leading end stopper member are rotated together. 10. A rotation amount of the sheet leading end stopper member from a position at which the sheet can be conveyed to a position at which the sheet leading end abuts on the sheet leading end is set in advance, and the rotation in the reverse direction is regulated by the driving member. The sheet conveying device according to claim 1, wherein 11. A feed roller in which the rotating roller rotates in a sheet conveying direction in contact with a sheet bundle set on a sheet setting table, and a feed roller in contact with the feed roller in a direction opposite to the sheet conveying direction. 11. A feed roller in a sheet separating and conveying device for separating and conveying sheets one by one from the sheet bundle, comprising a friction separating member for applying a force to the sheet bundle. Paper transport device according to the item. 12. The sheet conveying device according to claim 1, wherein the rotating roller is a registration roller that conveys the sheet to a photosensitive member at a proper timing. 13. A feed roller abutting on a bundle of documents set on a document set table and rotating in the direction of document transport, and contacting the feed roller to apply a force in a direction opposite to the document transport direction. A document separating / conveying unit for separating and conveying documents one by one from the document bundle, and a document conveying roller for conveying a document fed from a feed roller to a reading sensor; 12. The document reading apparatus according to claim 1, wherein the feed roller is a rotating roller.
A document reading device, comprising the paper transport device according to any one of the preceding claims. 14. A paper feed roller for feeding paper from a paper feed cassette loaded with paper, a transport roller for transporting paper fed from the paper feed roller, and timing of paper to an image forming unit. 2. The image forming apparatus according to claim 1, wherein the registration roller is a rotation roller, and the registration roller is configured to include a registration roller that receives and sends the sheet and a discharge roller that discharges the sheet outside the apparatus.
An image forming apparatus, comprising the sheet conveying device according to any one of Claims 0 and 12.