JP2003012168A - Paper-feed device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper-feed device capable of ensuring a sheet conveying passage relative to a conveying belt on the opposite side to a separation roller and stably positioning the conveying belt. SOLUTION: The conveying belt 15 is laid on a driving roller 16 and a tension roller 17. A driving shaft 26 of the driving roller 16 and a rotation shaft 33 of the conveying belt 15 are retained by a positioning member 34. A bearing 36 for retaining the rotation shaft 33 is urged to a direction leaving from the driving roller 16 by a compression spring 37 and a tension is imparted to the conveying belt 15. The conveying belt 15 is positioned such that it is pressed to the separation roller 18 by fitting a notch 40 of the positioning member 34 to a rotation shaft 28 of a pickup roller 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet feeding device such as an automatic document feeder.

[0002]

2. Description of the Related Art Conventionally, some image forming apparatuses such as copying machines and fax machines are provided with an automatic document feeder for automatically conveying a document set on a document tray to an image reading position. The automatic document feeder has, for example, a pickup roller for feeding the documents set on the document tray one by one, and a paper feed unit for feeding the documents sent from the pickup roller into the automatic document feeder. is doing.

FIG. 5 is an enlarged side sectional view of a main part showing the structure of a paper feeding section 62 in a conventional automatic document feeder 61.
In the automatic document feeder 61, when a document is set on the document tray 63 and the operation of the image forming apparatus is started, first, the leading end of the document is lifted by the lift plate 64.
The lift plate 64 is rotatably attached to the support shaft 65, and is rotated by, for example, a solenoid (not shown) to move upward from a standby position shown by a broken line in FIG. Can be lifted. Then, the vicinity of the leading edge of the document is pressed against the pickup roller 66 that rotates in the direction indicated by the arrow, so that the document is conveyed one by one from above along the upper guide 67 to the downstream side.

In the paper feeding section 62, a pickup roller 66
The originals sent from are conveyed to the downstream side by the conveyor belt 68. The conveyor belt 68 is an endless belt, and a drive roller 69 for rotating the conveyor belt 68.
And a tension roller 70 for applying tension to the conveyor belt 68. The drive shaft 71 of the drive roller 69 and the rotary shaft 72 of the tension roller 70 have two positioning members 7 with the rollers 69, 71 interposed therebetween.
3 has been bridged.

The positioning member 73 is a substantially rectangular main body 74.
A bearing 75 for holding the rotating shaft 72 of the tension roller 70, and a compression spring 76 for urging the bearing 75.
Including and The bearing 75 is fitted in the main body 74 and can slide in the longitudinal direction of the main body 74. The bearing 75 is urged by the compression spring 76 in a direction away from the drive shaft 71 of the drive roller 69, whereby the conveyor belt 68 wound around the drive roller 69 and the tension roller 70.
Tension is applied to.

The positioning member 73 is formed with a receiving portion 77 protruding upward from the main body 74. On the upper cover 78 of the automatic document feeder 61, a pressing portion 79 is formed so as to project downward at a position corresponding to the receiving portion 77 of the positioning member 73. The upper cover 78 is rotatably attached to the support shaft 80, and when the upper cover 78 is closed, the pressing portion 79 presses the receiving portion 77 of the positioning member 73 downward.

A torque limiter (not shown) is rotatably held below the conveyor belt 68 by a rotary shaft 82.
The separation roller 81 whose rotation is restricted by is arranged. The positioning member 73 is closed by closing the upper cover 78.
When is pressed downward, the outer peripheral surface of the conveyor belt 68 is pressed against the outer peripheral surface of the separation roller 81. As a result, the transport belt 68 is pressed against the separation roller 81 in the document transport direction with a predetermined contact width (nip width) and positioned.

When the conveyor belt 68 rotates, the separation roller 81 receives a frictional force from the conveyor belt 68. However, when the torque applied to the peripheral surface is small as in normal document conveyance, the separation roller 81 is operated by the torque limiter. 81 does not rotate. By the function of the separating roller 81, when two or more originals are conveyed (double-fed) by the pickup roller 66, the second and subsequent originals are separated from the first original and only the first original is separated. Can be transported to the downstream side.

[0009]

SUMMARY OF THE INVENTION The automatic document feeder is
Not only can a document having an image drawn only on one side (single-sided document) be conveyed, but a document having an image drawn on both sides (double-sided document) can also be conveyed. In this type of automatic document feeder, when conveying a two-sided document, the document is first conveyed from the document tray to the image reading position, the image recorded on one side is read, and then the document is turned upside down. The image recorded on the other surface is read by transporting the image to the image reading position again. When the document is turned upside down, the document is passed through a document transport path formed between the upper cover and the pickup roller and the transport belt to switch back the document.

In the case of a structure in which the positioning member 73 is pressed downward by the upper cover 78 to position the conveying belt 68 like the conventional automatic document feeder 61, the pressing portion 79 becomes an obstacle, and It is not possible to secure a document transport path between the cover 78 and the pickup roller 66 and the transport belt 68. Therefore, in order to use an automatic document feeder that can read both sides of a document, the conveyance belt 68 must be positioned without using the upper cover 78.

It is conceivable to fix the positioning member 73 directly to the upper guide 67, but in this case, the upper guide 6 is caused by the load applied to the conveying belt 68 when the original is conveyed.
7 may be warped or bent, and the position of the conveyor belt 68 may become unstable. When the position of the conveyor belt 68 becomes unstable, the nip width with the separation roller 81 varies, which may cause double feeding of documents or JAM (paper jam). The present invention has been made under such a background, and provides a sheet feeding device that can secure a sheet conveyance path on the side opposite to a separation roller with respect to a conveyance belt and that can stably position the conveyance belt. The purpose is to do.

[0012]

Means for Solving the Problems and Effects of the Invention The invention according to claim 1 for achieving the above object is an endless conveyor belt (15) for conveying a sheet (P).
And a feeding roller (5, 7) arranged on the upstream side or the downstream side of the feeding belt, for feeding the sheet set on the sheet tray (2) toward a predetermined position (A). A drive roller (16) for rotating the conveyor belt, which is held by a drive shaft (26) which is rotated around the conveyor belt, A tension roller (17) is rotatably held by a rotation shaft (33) extending substantially parallel to the drive shaft of the drive roller, and tensions the transfer belt by applying tension to the transfer belt. ), A separation roller (18) which is brought into contact with the outer peripheral surface of the conveyor belt and passes the sheets one by one between the conveyor belt, a drive shaft of the drive roller and a rotation shaft of the conveyor roller. To And a positioning member (34) for holding the rotary shaft of the tension roller and positioning the conveyor belt so as to press the conveyor belt against the separation roller. It is a paper feeding device.

The alphanumeric characters in parentheses represent corresponding components in the embodiments described later. The same applies in this section below. According to this configuration, the tension roller can be positioned by the positioning member that spans the drive shaft of the drive roller and the rotation shaft of the conveyance roller. Therefore, the sheet conveyance is performed on the side opposite to the separation roller with respect to the conveyance belt. The road can be secured. In addition, since the tension roller is positioned by the positioning member that spans the drive shaft of the drive roller and the rotation shaft of the conveying roller, the upper guide is warped or bent as compared with the case where the positioning member is directly fixed to the upper guide. As a result, the position of the conveyor belt can be prevented from becoming unstable, and the conveyor belt can be positioned stably. As a result, it is possible to prevent variations in the nip width between the conveyor belt and the separation roller, and thus to prevent double feeding of sheets and JAM.

According to a second aspect of the present invention, the positioning member rotatably holds the rotary shaft of the tension roller, and the sliding direction is substantially orthogonal to the direction in which the conveyor belt is pressed by the separation roller. And a biasing member (37) for biasing the bearing member in a direction away from the drive shaft of the drive roller along the sliding direction. The sheet feeding device according to claim 1, further comprising:

According to this structure, even if the relative position between the conveyor belt and the separation roller varies, the biasing member acts so that the tension of the conveyor belt becomes as constant as possible. It is possible to suppress variations in the pressing force of the sheet, and prevent double feeding of sheets and JAM. Further, since the sliding direction is substantially orthogonal to the direction in which the conveyor belt is pressed by the separation roller, it is possible to prevent the position of the conveyor belt from becoming unstable due to the pressing force from the separation roller. Can be positioned stably.

According to a third aspect of the present invention, if the conveying roller is a pickup roller (5) for sending the sheet set on the sheet tray toward the conveying belt, the driving roller is driven. The conveyor belt can be stably positioned by the positioning member spanning the shaft and the rotation shaft of the pickup roller.
In particular, since the relative position of the conveyor belt with respect to the pickup roller can be kept constant, the position of the conveyor belt with respect to the leading edge of the sheet sent out from the sheet tray by the pickup roller can be stabilized, and the sheet is preferably sent from the sheet tray. be able to.

According to a fourth aspect of the present invention, the conveyance roller is a registration roller (7) for feeding the sheet sent from the conveyance belt toward the predetermined position at a predetermined timing. The conveyor belt can be stably positioned by the positioning member spanning the drive shaft of the drive roller and the rotation shaft of the registration roller. In particular, since the relative position of the registration roller with respect to the conveyor belt can be kept constant, the position of the registration roller with respect to the leading edge of the sheet sent from the conveyor belt can be stabilized, and the sheet can be appropriately sent out from the registration roller. You can

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is an automatic document feeder 1 according to an embodiment of a sheet feeder of the present invention.
FIG. 3 is a schematic side sectional view showing the internal configuration of FIG. The automatic document feeder 1 is applied to an image forming apparatus such as a copying machine or a facsimile, and the operation of the image forming apparatus is started with the document P set on the document tray 2, so that the document P
Sheets are automatically conveyed one by one toward the image reading position A,
The image recorded on the document P is read and then discharged onto the discharge tray 4. This automatic document feeder 1
Not only can a document having an image recorded on only one side (single-sided document) be conveyed, but a document having an image recorded on both sides (double-sided document) can also be conveyed.

The automatic document feeder 1 is provided with a pickup roller 5, a paper feed unit 6 arranged downstream of the pickup roller 5 in the document conveyance direction, and a paper feed unit 6 arranged downstream of the paper feed unit 6 to feed a document P. A pair of registration rollers 7 for sending out toward the image reading position A at a predetermined timing, a plurality of pairs of conveyance rollers 8, 9, 10 arranged on the downstream side of the pair of registration rollers 7, and an upstream side of the discharge tray 4. And a pair of discharge rollers 11 arranged in the.

The original P is set on the original tray 2 so that the front surface faces upward. When the document P is set on the document tray 2 and the operation of the image forming apparatus is started, first, the leading end of the document P is lifted by the lift plate 12. The lift plate 12 is rotatably attached to the support shaft 13, and is rotated by, for example, a solenoid (not shown) to move upward from a standby position shown by a solid line in FIG. Can be lifted. Then, the vicinity of the leading edge of the document P is pressed against the pickup roller 5 rotating in the direction indicated by the arrow, whereby the document P is conveyed one by one from the top to the paper feed unit 6 along the upper guide 14. It

The paper feeding section 6 is configured to feed the original P to the automatic original feeder 1.
The original P sent from the pickup roller 5 is conveyed to the downstream side by the conveying belt 15 for feeding the inside. The conveyor belt 15 is an endless belt, and is wound around a drive roller 16 for rotating the conveyor belt 15 and a tension roller 17 for applying tension to the conveyor belt 15. Drive roller 16
Is driven to rotate, the conveyor belt 15 rotates, and the tension roller 17 also rotates accordingly.

The conveyor belt 15 is rotatably held,
It is pressed against the separation roller 18 whose rotation is restricted by a torque limiter (not shown). When the conveyance belt 15 is rotated, the separation roller 18 receives a frictional force from the conveyance belt 15, but when the torque applied to the peripheral surface is small as in the case of normal document conveyance, the separation roller 18 is operated by the torque limiter. Is designed not to rotate. By the function of the separating roller 18, when two or more originals P are conveyed (double-fed) from the pickup roller 5 in a superposed manner,
It is possible to separate the first and subsequent originals P from the first original P and to convey only the first original P downstream.
The document P is transported to the document transport path R1 through the paper feed unit 6.

When a single-sided original is conveyed, the original conveying path R1
The original P conveyed to is conveyed to the image reading position A sandwiched between the reading guide 20 and the contact glass plate 21 via the registration roller pair 7 and the conveying roller pairs 8 and 9. The document conveyance path R1 is substantially horizontal between the registration roller pair 7 and the conveyance roller pair 8, but the conveyance roller pair 8
To the image reading unit 3 are curved downwards,
The original P is turned upside down and guided to the image reading position A.

The document P guided to the image reading position A is passed between the reading guide 20 and the contact glass plate 21 by a scanner (not shown) arranged below the contact glass plate 21. The image is read.
The document P on which the image recorded on the front surface at the image reading position A has been read is conveyed roller pair 10 and discharge roller pair 1.
It is discharged onto the discharge tray 4 via 1. At this time,
Since a plurality of originals P are conveyed on the original tray 2 even when a plurality of originals P are conveyed, the plurality of originals P ejected on the original tray 2 remain on the original tray 2 because the front surface faces downward. The pages are stacked in order from the bottom in the same page order as when set to.

Immediately downstream of the registration roller pair 7, an original conveying path R2 branches upward from an original conveying path R1 toward the conveying roller pair 8, and a branch claw 22 is rotatable at the branch point. It is located in. When conveying a single-sided original, the branching claw 22 closes the original conveying path R2 at the position shown by the solid line in FIG. 1 and guides the original P to the pair of conveying rollers 8, but when conveying a double-sided original, in FIG. The original document conveyance path R1 is closed at the position indicated by the broken line, and the original document P conveyed from the paper feed section 6 via the registration roller pair 7 is guided to the original document conveyance path R2.

A reversing roller 23 is arranged at the end of the document conveying path R2 so as to be rotatable in either a clockwise or counterclockwise direction. The document P sent from the document transport path R2 is guided to the document transport path R3 by the reversing roller 23 rotating clockwise. The document transport path R3 is
It extends between the upper cover 24 of the automatic document feeder 1 and the pickup roller 5 and the paper feed section 6. When the document P is guided to the document transport path R3 and the rear end of the document P reaches the reversing roller 23, the rotation of the reversing roller 23 is switched in the reverse direction (counterclockwise), and the document P is switched back. It is guided to the pair of transport rollers 8 via the document transport path R4. Then, the image is guided to the image reading position A via the conveyance roller 9 and the image recorded on the back side is read.

Immediately upstream of the discharge roller pair 11, upward from the document conveying path R1 toward the discharge roller pair 11,
The document transport path R5 is branched, and a branch claw 25 is rotatably arranged at the branch point. When conveying a single-sided original, the branching claw 25 closes the original conveying path R5 at the position shown by the solid line in FIG. 1 and guides the original P to the discharge roller pair 11. However, when conveying a double-sided original, the case shown in FIG. In the position indicated by the broken line in FIG. 3, the document conveyance path R1 is closed, and the document P conveyed from the image reading position A side is guided to the registration roller pair 7 via the document conveyance path R5.

The branching claw 22 closes the original feeding path R1 at the position shown by the broken line in FIG.
Document P that has been conveyed from registration roller pair 7
To the document conveyance path R2. Then, the document P switched back by the reversing roller 23 is guided to the image reading position A through the pair of conveying rollers 8 and 9, and the image recorded on the front surface is read. The branching claw 25 is returned to the position shown by the solid line in FIG. 1, and the document P sent from the image reading position A side is discharged onto the discharge tray 4 by the discharge roller pair 11. At this time, since the front surface of the document P is discharged onto the discharge tray 4 so that the front surface faces downward, even when a plurality of documents P are conveyed, the plurality of documents P discharged onto the discharge tray 4 are The pages are stacked in order from the bottom in the same page order as when set on the tray 2.

FIG. 2 is an enlarged side sectional view of the main part showing the structure of the paper feeding section 6. Further, FIG. 3 is a view of the paper feeding unit 6 as viewed from above, and shows a state in which the upper cover 24 is removed. Referring to FIGS. 2 and 3, a drive shaft 26 is fitted in the drive roller 16, and the drive shaft 26 is covered with two bearings 27 with the drive roller 16 interposed therebetween. On the other hand, a rotary shaft 28 is fitted in the pickup roller 5, and the rotary shaft 28 is covered with two bearings 29 with the pickup roller 5 interposed therebetween. The two bearings 27 of the drive roller 16 and the two bearings 29 of the pickup roller 5 are held by a holding plate 30 projecting upward from the upper guide 14, respectively. It is rotatably held by 14.

A drive device (not shown) is connected to one end of the drive shaft 26 of the drive roller 16. For example, the drive shaft 26 is rotated and driven by rotationally driving a motor included in the drive device. The roller 16 is adapted to rotate. Pulleys 31 are fitted into the drive shaft 26 of the drive roller 16 and the rotary shaft 28 of the pickup roller 5, and a timing belt 32 is wound around these pulleys 31. As a result, when the drive shaft 26 is rotationally driven, the rotary shaft 28 also rotates accordingly,
The pickup roller 5 rotates.

The drive shaft 26 of the drive roller 16 and the rotary shaft 28 of the pickup roller 5 have respective rollers 16 and 17.
Two positioning members 34 are bridged across the two.
The positioning member 34 is used for the rotating shaft 3 of the tension roller 17.
Holds 3. FIG. 4 is a plan view showing the configuration of the positioning member 34. Since the two positioning members 34 have substantially the same configuration, only one positioning member 34 will be described below.

The positioning member 34 is, for example, a substantially V-shaped main body 35 and is fitted into the main body 35, and the tension roller 1
Bearing 36 for holding the rotating shaft 33 of
And a compression spring 37 for biasing. An insertion hole 38 for inserting the drive shaft 26 of the drive roller 16 is formed at one end of the main body 35. An elongated hole 39 into which the bearing 36 is fitted is formed from the side of the insertion hole 38 to the central portion of the main body 35. The bearing 36 is fitted in the elongated hole 39 and is slidable in the extending direction of the elongated hole 39. The bearing 36 is formed with a contact surface 36a that is a flat surface for contacting the compression spring 37.

The compression spring 37 is fitted into the elongated hole 39, one end surface of which is brought into contact with one end edge 39a of the elongated hole 39,
The other end surface is brought into contact with the contact surface 36 a of the bearing 36. As a result, the bearing 36 is urged toward the central portion of the main body 35, that is, in the direction away from the insertion hole 38. At the other end of the main body 35, the rotary shaft 28 of the pickup roller 5 is attached.
Is formed with a notch 40 for fitting.

Referring again to FIG. 2 and FIG. 3, the drive shaft 26 of the drive roller 16 is inserted through the insertion holes 38 of each body 35 of the two positioning members 34, and the rotary shaft 33 of the tension roller 17 is inserted into each bearing 36. The tension roller 17 is urged in a direction away from the drive roller 16 by inserting both ends of the. As a result, the conveyor belt 15 wound around the driving roller 16 and the tension roller 17
Tension is applied to. When the notch 40 of each positioning member 34 is fitted into the rotary shaft 28 of the pickup roller 5 in this state, the conveyor belt 15 is pressed by the separation roller 18 with a predetermined contact width (nip width) in the document conveying direction.

In this embodiment, the tension roller 17 is provided by the positioning member 34 that is bridged over the drive shaft 26 of the drive roller 16 and the rotary shaft 28 of the pickup roller 5.
Therefore, it is possible to secure the document conveyance path R3 on the side opposite to the separation roller 18 with respect to the conveyance belt 15, that is, above the sheet feeding section 6. Also,
Since the tension roller 17 is positioned by the positioning member 34 laid over the drive shaft 26 of the drive roller 16 and the rotary shaft 28 of the pickup roller 5, as compared with the case where the positioning member 34 is directly fixed to the upper guide 14,
It is possible to prevent the position of the conveyor belt 15 from becoming unstable due to the warp or bending of the upper guide 14, and the conveyor belt 15 can be positioned stably. As a result, it is possible to prevent variations in the nip width between the conveyor belt 15 and the separation roller 18, and thus it is possible to prevent double feeding of documents and JAM (paper jam).

Further, the conveying belt 15 is separated by the separating roller 18.
Since the sliding direction of the bearing 36 is substantially orthogonal to the direction in which the conveyor belt 15 is pressed against, the position of the conveyor belt 15 can be prevented from becoming unstable due to the pressing force from the separation roller 18, and the conveyor belt 15 can be prevented. Stable positioning is possible. In particular, since the relative position of the conveyor belt 15 with respect to the pickup roller 5 can be kept constant, the position of the conveyor belt 15 with respect to the leading edge of the document sent from the document tray 2 by the pickup roller 5 can be stabilized, and the document tray 2 The original can be suitably fed into the automatic document feeder 1.

The positioning member 34 is not limited to the pick-up roller 5, but may be, for example, one fitted to one rotation shaft of the registration roller pair 7 shown in FIG. That is, the positioning member 34 serves as the drive shaft 26 of the drive roller 16.
Even if the conveyor belt 15 is to be positioned by the positioning member 34 that is bridged over the one rotation shaft of the registration roller pair 7, the conveyor belt 15 can be stably positioned. In this case, in particular, since the relative position of the registration roller pair 7 with respect to the transport belt 15 can be kept constant, the position of the registration roller pair 7 with respect to the leading edge of the document sent from the transport belt 15 can be stabilized, The original can be preferably sent out from the registration roller pair 7.

The separation roller 18 has a lower guide 42 for guiding the lower side of the document fed by the paper feeding section 6,
It is included in the driven roller unit 44 defined by the bottom plate 43. The driven roller unit 44 is detachable from the automatic document feeder 1, and the separation roller 18
Is removed from the automatic document feeder 1 at the time of maintenance. A rotary shaft 45 is fitted in the separation roller 18, and the rotary shaft 45 is held by a holding member 46. One end of the holding member 46 has a lower guide 42.
It is attached to a support shaft 47 fixed to and is rotatable with respect to the support shaft 47. A contact surface 49 for contacting the compression spring 48 is provided on the other end of the holding member 46.
Are formed.

A compression spring 48 is arranged between the contact surface 49 of the holding member 46 and the upper surface of the bottom plate 43. The contact surface 49 of the holding member 46 is biased upward by the compression spring 48, and the rotary shaft 45 is biased upward. When the driven roller unit 44 is a separate unit from the automatic document feeder 1, the relative positions of the conveyor belt 15 and the separation roller 18 are likely to vary. In this embodiment,
Even if the relative position between the conveyor belt 15 and the separation roller 18 varies, the compression spring 37 expands and contracts, and the conveyor belt 1
Since the tension of No. 5 acts so as to be as constant as possible, it is possible to suppress variations in the pressing force between the transport belt 15 and the separation roller 18, and to prevent double feeding of documents and JAM.

Further, in this embodiment, the belt restricting portion 41 for preventing the conveyor belt 15 from shifting in the width direction.
However, they are arranged on both sides with the conveyor belt 15 sandwiched in the width direction. The belt regulation unit 41 is, for example, the tension roller 1
7 is formed integrally with the bearing 36. The belt restricting portion 41 has a substantially fan-shaped cross section, and projects upward from the bearing 36. The belt regulation portion 41 has a tip edge protruding higher than the outer peripheral surface of the conveyor belt 15, and can reliably regulate the conveyor belt 15 which is displaced in the width direction.

The present invention is not limited to the contents of the above embodiment, and various modifications can be made within the scope of the claims. For example, the positioning member may be configured without the compression spring 37. Further, the configuration of the present invention is not limited to the automatic document feeder 1, and may be, for example, a manual paper feed unit for manually feeding recording paper, or a cassette feeding device for feeding recording paper set in a paper cassette. It may be applied to a paper section or the like.

[Brief description of drawings]

FIG. 1 is a schematic side sectional view showing an internal configuration of an automatic document feeder according to an embodiment of a sheet feeder of the invention.

FIG. 2 is an enlarged side sectional view of an essential part showing the configuration of a paper feeding unit.

FIG. 3 is a view of the paper feeding unit as viewed from above.

FIG. 4 is a plan view showing a configuration of a positioning member.

FIG. 5 is an enlarged side sectional view of an essential part showing a configuration of a paper feeding unit in a conventional automatic document feeder.

[Explanation of symbols]

1 Automatic document feeder 2 Document tray 5 Pickup roller 7 Registration roller pair 15 Conveyor belt 16 drive roller 17 Tension roller 18 Separation roller 26 Drive shaft 33 rotation axis 34 Positioning member 36 bearings 37 Compression spring A Image reading position P manuscript

Continued front page    F-term (reference) 3F102 AA02 AA11 AB01 BA02 BA09                       BB02 DA08 EA03                 3F343 FA01 FB02 FB04 FC01 GA01                       GB01 GC01 GD01 JA00 JA31                       JD09 JD33 KB05 KB17

Claims (4)

[Claims] 1. An endless conveyor belt for conveying a sheet, and a conveyor roller arranged on the upstream side or the downstream side of the conveyor belt. The sheet set on a sheet tray is set at a predetermined position. A device for feeding toward the drive roller, which is a roller for rotating the conveyor belt, the drive roller being held by a drive shaft about which the conveyor belt is wound and rotationally driven; A tension roller that is rotatably held by a rotary shaft that extends substantially parallel to the drive shaft and that applies tension to the conveyor belt by being wound around the conveyor belt and an outer peripheral surface of the conveyor belt. A portion that is abutted and bridges the separation roller for passing the sheets one by one between the conveyor belt and the drive shaft of the drive roller and the rotation shaft of the conveyor roller. And a positioning member for holding the rotary shaft of the tension roller and positioning the conveyor belt so as to press the conveyor belt against the separation roller. 2. The positioning member rotatably holds the rotary shaft of the tension roller and is slidable along a sliding direction substantially orthogonal to the direction in which the conveyor belt is pressed by the separation roller. 2. The feeding device according to claim 1, further comprising: a simple bearing member; and a biasing member for biasing the bearing member in a direction away from the drive shaft of the drive roller along the sliding direction. Paper equipment. 3. The sheet feeding device according to claim 1, wherein the conveying roller is a pickup roller for feeding the sheet set on the sheet tray toward the conveying belt. 4. The register roller according to claim 1, wherein the carrying roller is a registration roller for sending the sheet sent from the carrying belt toward the predetermined position at a predetermined timing. Paper feeder.