JP2011011840A - Skew correcting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve certainty in a skew correction on a sheet of various sizes.SOLUTION: This skew correction device has a separation roller 8, a pair of sheet tip abutting parts 24a and 24b for regulating an advance of the sheet P while making a first load T1 in the inverse direction of the sheet carrying direction Z act by abutting on an end part of the sheet P on the downstream side of the separation roller 8, and a pair of sheet tip abutting parts 23a and 23b for regulating an advance of the sheet P while making a second load T2 in the inverse direction of the sheet carrying direction Z act by abutting on the end part of the sheet P on the downstream side in the sheet carrying direction Z more than the separation roller 8 on the outside of the pair of sheet tip abutting parts 24a and 24b in the sheet width direction W of the sheet P. The skew correction device 22 is constituted so that a dimension of the separation roller 8 in the sheet width direction W of the sheet P is smaller than a dimension between the sheet tip abutting parts 23a and 23b, and a first load T1 of the sheet tip abutting parts 24a and 24b is larger than a second load T2 of the sheet tip abutting parts 23a and 23b.

Description

  The present invention relates to a skew correction device that corrects skew of a conveyed sheet.

  Conventionally, when sheets are separated and conveyed one by one from the sheet storage case, there has been a problem that the sheets are skewed. Such skewing of the sheet is corrected by stopping when the sheet hits the nip of the pair of conveying rollers having the clutch. As an invention relating to such a skew correction device for correcting the skew of a sheet, there is an invention described in Patent Document 1.

  The invention described in Patent Document 1 has a configuration in which the urging force is entirely adjusted by a coil spring with respect to the regulating pieces arranged in the sheet width direction (sheet width direction) orthogonal to the sheet conveyance direction (sheet conveyance direction). It is. According to such a configuration, the leading end portion (downstream side) of the sheet in the sheet conveying direction forms a loop with one end portion contacting the one restriction piece first, and the other end portion after the other end portion. Abuts on the restriction piece. And all the front-end | tip parts of the sheet | seat conveyance direction of the sheet | seat will be in the state contact | abutted to the control piece arrange | positioned in a sheet conveyance direction, and skew feeding of a sheet | seat is corrected.

  The invention described in Patent Document 1 includes a tension coil spring and a plurality of spring locking pieces formed on the frame in parallel with the sheet conveyance direction. Then, the tension coil spring is hooked on any one of the plurality of spring locking pieces according to the basis weight of the sheet, and the urging force by the regulating piece is changed. According to such a configuration, a thin urging force is applied to the thin sheet, and the sheet is not damaged. Further, a strong biasing force is applied to the thick sheet, and the skew of the sheet is sufficiently corrected.

Japanese Patent Laid-Open No. 11-11745

  However, the invention described in Patent Document 1 still has a problem that skew correction of a small size sheet is insufficient. Moreover, in the invention described in Patent Document 1, there is a problem that the apparatus becomes complicated and large due to the configuration of the tension coil spring and the plurality of locking pieces.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a skew correction device that can improve the reliability of skew correction for sheets P of various sizes.

  In order to solve the above problems, a skew feeding correction device according to the present invention includes a first conveying unit that conveys a sheet in a sheet conveying direction in which the sheet is conveyed, and a downstream side of the first conveying unit in the sheet conveying direction. A second conveying unit that conveys a sheet; and a downstream side of the first conveying unit that abuts against a leading end portion of the sheet in the sheet conveying direction and applies a first load in a direction opposite to the sheet conveying direction. A pair of first restricting pieces for restricting the progress of the sheet, and a downstream side in the sheet conveying direction from the first conveying means outside the pair of first restricting pieces in the sheet width direction orthogonal to the sheet conveying direction. A pair of second restricting pieces that are in contact with the leading end of the sheet in the sheet conveying direction and restrict the progress of the sheet while applying a second load in the direction opposite to the sheet conveying direction, and a sheet width The first conveying means in the direction The dimension is set smaller than the dimension between the pair of second restricting pieces, and the first load of the first restricting piece is set larger than the second load of the second restricting piece to skew the sheet. It is characterized by correcting.

  As described above, according to the present invention, the reliability of skew correction is improved with respect to sheets of various sizes.

It is the perspective view seen from the upper part of the image reading apparatus provided with the skew feeding correction apparatus which concerns on one Example of this invention. It is the perspective view seen from the upper part of the image reading apparatus with which the platen unit was opened. It is sectional drawing which shows the structure of an image reading apparatus. It is the expanded sectional view which expanded the X section of FIG. It is a perspective view which shows the structure of a skew feeding correction device. It is process drawing which shows the process before correct | amending skew feeding of a small sized sheet. It is process drawing which shows the process after skew feeding of the small sized sheet | seat was correct | amended. It is a process diagram showing a process before correcting skew feeding of a large size sheet. It is process drawing which shows the process after skew feeding of the large sized sheet | seat was correct | amended.

  Hereinafter, exemplary embodiments of the present invention will be described in detail by way of example. However, since the dimensions, materials, shapes, relative positions, etc. of the components described in this embodiment are appropriately changed depending on the configuration of the apparatus to which the present invention is applied and various conditions, there are particularly specific descriptions. As long as there is not, it is not the meaning which limits the scope of the present invention only to them.

  FIG. 1 is a perspective view of an image reading apparatus 50 provided with a skew feeding correction device 22 (see FIG. 5) according to an embodiment of the present invention as viewed from above. As shown in FIG. 1, the image reading apparatus 50 includes an image reading apparatus main body (hereinafter simply referred to as “apparatus main body”) 50 </ b> A and a pressure plate unit 1. The platen unit 1 includes a tray 4 on which document sheets can be stacked, a width regulating plate 19 for aligning the width direction of the document sheet perpendicular to the document sheet transport direction, and a transported document that reads an image of the transported document sheet. A reading unit 5. Hereinafter, the document sheet conveyance direction is hereinafter simply referred to as “sheet conveyance direction”. Hereinafter, the width direction of the original sheet orthogonal to the conveyance direction of the original sheet is hereinafter simply referred to as “sheet width direction”.

  FIG. 2 is a perspective view of the image reading apparatus 50 with the pressure plate unit 1 opened as viewed from above. As shown in FIG. 2, the apparatus main body 50 </ b> A is provided with a platen glass 6 and a contact glass 12 for reading with the sheet P placed thereon. A white background plate 2 for attaching the sheet P to the platen glass 6 at the time of reading a still image is attached to the still image reading unit on the back surface of the pressure plate unit 1. A hinge 3 is attached between the apparatus main body 50A and the pressure plate unit 1, and the pressure plate unit 1 is configured to be openable and closable with respect to the apparatus main body 50A around the hinge 3.

  FIG. 3 is a cross-sectional view showing the configuration of the image reading apparatus 50. As shown in FIG. 3, the transport document reading unit 5 includes a substantially U-shaped sheet transport path (hereinafter referred to as a U-turn path) 7. A separation roller 8, a separation pad 9, and a sheet stopper 10 that regulates the leading end position of the sheet P are attached to the U-turn path 7. The U-turn path 7 is provided with a pickup roller 17 that contacts and picks up the uppermost one of the stacked sheets P, a sheet presence sensor 11 that detects the presence or absence of the sheet P, and the like. Further, in the U-turn path 7, the skew feeding correction device 22 according to the present invention including the conveyance roller 13 that conveys the sheet P, the sheet discharge roller pair 14, and the sheet that detects the leading edge and the trailing edge of the sheet P. An edge sensor 15 or the like is attached. The separation roller 8 as a “separation conveyance unit” that is a “first conveyance unit” is a roller that separates and conveys one sheet from a plurality of sheets P.

  The contact image sensor 16 irradiates the image information surface of the sheet P with light from an LED array as a light source, and forms an image of reflected light reflected by the image information surface on a sensor element with a SELFOC lens (trademark). Is read.

  In the transported document reading unit 5, when the user places the sheet P on the tray 4, the sheet P is set with the read image surface facing up. Further, the sheet width direction W of the sheet P is regulated by the width regulating plate 19. Further, the leading end position of the sheet P is regulated by the sheet stopper 10, and the presence or absence of the sheet P is detected by the sheet presence sensor 11.

  When the user instructs to start reading from the operation unit (not shown), the drive unit (not shown) rotates, the sheet stopper 10 is pushed down, and the sheet P is separated by the pickup roller 17 from the separation roller 8 and the separation pad 9. It is conveyed to. Then, the sheets P are separated one by one, and the uppermost sheet P is separated and conveyed. Further, the skew of the sheet P is corrected by the skew correction device 22 provided with the transport roller 13 (details will be described later). The skew-corrected sheet P is conveyed to the reading unit of the contact image sensor 16.

  When the leading edge portion of the sheet P is detected by the sheet edge sensor 15 in the document conveying portion, reading of image information by the contact image sensor 16 is started when a predetermined amount is conveyed from the position. After starting reading, the sheet P moves toward the sheet discharge roller pair 14. When the trailing edge of the sheet P is detected by the sheet edge sensor 15, reading of image information by the contact image sensor 16 is completed when a predetermined amount is conveyed from the position. Then, the sheet P is discharged outside by the sheet discharge roller pair 14. In this manner, the conveyed document reading unit 5 repeats the above-described reading operation until the sheet presence sensor 11 detects the absence of a sheet.

  FIG. 4 is an enlarged cross-sectional view in which an X portion in FIG. 3 is enlarged. As shown in FIG. 4, a first pressing means 20 for pressing the sheet P against the contact glass 12 is provided above the contact image sensor 16. Further, a large gap between the first pressing unit 20 and the conveying roller 13 due to flapping of the sheet P at the sheet reading position Y when the leading end of the sheet P enters the downstream guide member 27 or the sheet discharge roller pair 14. A second pressing means 18 is provided for suppressing image disturbance. The second pressing means 18 is swingably supported by the lower guide member 21.

  FIG. 5 is a perspective view showing the configuration of the skew feeding correction device 22. As shown in FIG. 5, the skew feeding correction device 22 includes a conveyance roller 13 and a driven roller 33. The conveyance roller 13 has a conveyance roller shaft 13a, and the driven roller 33 has a driven roller shaft 33a. A first regulating member 24 for a small-sized sheet having a short length in the width direction of the sheet P is rotatably attached to the driven roller shaft 33a. Further, the second regulating member 23 for a large-sized sheet having a long length in the width direction of the sheet P is rotatably attached to the driven roller shaft 33a.

  The arrangement relationship of the separation roller 8 serving as the “first transporting unit”, the transporting roller 13 serving as a part of the “second transporting unit”, and the driven roller 33 serving as a part of the “second transporting unit” will be described. To do. On the upstream side in the sheet conveying direction Z, a separation roller 8 that is a “first conveying unit” that conveys the sheet P in the sheet conveying direction Z in which the sheet P is conveyed is provided. On the downstream side of the separation roller 8 in the sheet conveyance direction Z, a conveyance roller 13 and a driven roller 33 that convey the sheet P are provided.

  The first restricting member 24 extends in the sheet width direction W orthogonal to the sheet conveying direction Z. The first restricting member 24 is bent in an L shape at one end in the sheet width direction W to form a sheet leading end abutting portion 24a that is a “first restricting piece”. The sheet front end contact portion 24a has a sheet contact surface on which the sheet contacts because the front end portion of the sheet P contacts. Further, the first regulating member 24 is bent in an L shape on the other end side in the sheet width direction W to form a sheet leading end contact portion 24b which is a “first regulating piece”. The sheet front end contact portion 24b has a sheet contact surface on which the sheet contacts because the front end portion of the sheet P contacts. The bending directions of the sheet tip contact portion 24a on the one end side and the sheet tip contact portion 24b on the other end side are parallel and in the same direction.

  The second regulating member 23 extends in the sheet width direction W orthogonal to the sheet conveying direction Z. The second regulating member 23 is bent in an L shape at one end side in the sheet width direction W to form a sheet leading end abutting portion 23a which is a “second regulating piece”. The sheet leading edge abutting portion 23a has a sheet abutting surface on which the sheet abuts because the leading end of the sheet P abuts. Further, the second regulating member 23 is bent in an L shape on the other end side in the sheet width direction W to form a sheet leading end abutting portion 23b which is a “second regulating piece”. The sheet leading edge abutting portion 23b has a sheet abutting surface on which the sheet abuts because the leading end of the sheet P is abutted. The bending directions of the sheet tip contact portion 23a on the one end side and the sheet tip contact portion 23b on the other end side are parallel and in the same direction.

  The above-described sheet leading edge abutting portions 23 a, 23 b, 24 a, and 24 b are disposed upstream of the nip portion between the conveying roller 13 and the driven roller 33 in the sheet conveying direction Z. The second restricting member 23 and the first restricting member 24 are each urged counterclockwise (arrow X direction) by their own weight. The sheet P is skewed while being in contact with any one of the sheet front end contact portions 23a, 23b, 24a, and 24b. Then, the sheet P is conveyed toward the sheet reading position Y (see FIG. 4) by rotating the regulating members 23 and 24 in the clockwise direction (the direction opposite to the arrow X) and by the conveying roller 13 and the driven roller 33. .

  The pair of sheet tip contact portions 24 a and 24 b is provided on the downstream side of the separation roller 8. An urging spring 26 serving as a “first urging unit”, which is a “biasing unit”, is attached to the pair of sheet tip contact portions 24 a and 24 b. The pair of sheet front end abutting portions 24a and 24b is rotated by its own weight and the urging force of the urging spring. When the leading end side of the sheet P in the sheet conveying direction Z is in contact with the pair of sheet leading end abutting portions 24a and 24b by the pair of sheet leading end abutting portions 24a and 24b, the direction opposite to the sheet conveying direction Z is obtained. The first load T1 acts on the sheet P, and the progress of the sheet P is restricted.

  The pair of sheet front end abutting portions 23a and 23b is located outside the pair of sheet front end abutting portions 24a and 24b in the sheet width direction W orthogonal to the sheet transport direction Z and downstream of the separation roller 8 in the sheet transport direction Z. Is provided. The pair of sheet tip contact portions 23a and 23b is rotated only by its own weight. When the leading end side of the sheet P in the sheet conveying direction Z is in contact with the pair of sheet leading end abutting portions 23a and 23b by the pair of sheet leading end abutting portions 23a and 23b, the direction opposite to the sheet conveying direction Z is obtained. The second load T2 acts on the sheet P, and the progress of the sheet P is restricted.

  Here, since the small-sized sheet P has a short length in the sheet conveyance direction Z, the sheet conveyance direction of the sheet P before the leading end of the sheet P on the sheet conveyance direction Z side reaches the first regulating member 24. The rear end portion on the side opposite to Z may come off the width regulating plate 19. Therefore, there is a problem that the amount of skew of the small size sheet P becomes larger than the amount of skew of the large size sheet P.

  Therefore, in particular, the above-described biasing spring 26 is attached to the first restricting member 24 in order to reliably correct the skew of the small size sheet P. The first load T1 in the counterclockwise direction (arrow X direction) of the first restricting member 24 for the small size sheet is in the counterclockwise direction (arrow X direction) of the second restricting member 23 for the large size sheet. It is set to be larger than the second load T2. Thus, for example, even for a small-sized sheet P such as a postcard or a business card, the skew of the sheet P is corrected.

  For example, the urging force of the second restricting member 23 for large size sheets is set to 30 g, and the urging force of the first restricting member 24 for small size sheets is set to 40 g. As a result, both the small size sheet and the large size sheet are surely corrected for skew feeding.

  In the sheet width direction W, the dimension of the separation roller 8 is set to be smaller than the dimension between the sheet leading end contact portion 23a and the sheet leading end contact portion 23b. Thus, when the dimension of the separation roller 8 is short, the direction of the sheet P can be changed by the external force in the sheet conveying direction Z applied to the sheet P. Therefore, even if the sheet P is skewed while passing through the separation roller 8, the sheet P is brought into contact with the sheet leading end contact portion 24a and the sheet leading end contact portion 24b to obtain an external force, and the skew of the sheet P is corrected. Is done.

  FIG. 6 is a process diagram showing a process before correcting the skew of the small-sized sheet P. As shown in FIG. 6, in the skew feeding correction device 22, the sheet leading edge contact portions 24 a and 24 b are disposed on the downstream side in the sheet conveying direction Z with respect to the sheet leading edge contact portions 23 a and 23 b. With such a configuration, the skew of the large-size sheet P is corrected by the outer sheet front end contact portions 23a and 23b. Further, the skew of the small-sized sheet P is corrected by the inner sheet front end abutting portions 24a and 24b. In both the large size and the small size, the skew of the sheet P is corrected at the outer portion in the sheet width direction W as much as possible. As a result, the skew of the small size sheet P is reduced.

  As shown in FIG. 6, it is assumed that a small-sized sheet P is conveyed in the sheet conveying direction Z. In this case, when the sheet P is conveyed while being skewed in the left oblique direction, first one side (right side) of the front end portion of the sheet P in the sheet conveying direction Z contacts the sheet front end abutting portion 24a. . At this time, the sheet leading end abutting portion 24a is urged in the direction opposite to the sheet conveying direction Z by its own weight and the first load T1 by the urging spring 26, so that the sheet P resists the urging force. The sheet tip contact portion 24a cannot be rotated. Therefore, in this state, the sheet P is prevented from advancing at a portion that is in contact with the sheet tip contact portion 24a, and a loop is formed.

  On the other hand, since the sheet P is skewed at this time, the sheet P does not come into contact with the sheet leading end contact portion 24b of the first regulating member 24. That is, the other side (left side) of the front end portion of the sheet P in the sheet conveyance direction Z is not in contact with the sheet front end contact portion 24b. Thereafter, the sheet P continues to be conveyed by the separation roller 8.

  FIG. 7 is a process diagram showing a process after the skew of the small-sized sheet P is corrected. As shown in FIG. 7, the other side (left side) of the leading end portion of the sheet P in the sheet conveying direction Z comes into contact with the sheet leading end contact portion 24b. Here, the skew of the small-sized sheet P is corrected.

  In this state, the sheet P comes into contact with both the sheet front end contact portion 24a and the sheet front end contact portion 24b, and the stiffness due to the loop of the sheet P overcomes the urging force of the sheet front end contact portions 24a and 24b. As a result, the sheet P pushes the sheet front end contact portions 24 a and 24 b, and the sheet P can rotate the first restricting member 24. Thereafter, the sheet P reaches the conveying roller 13 and the driven roller 33 and is conveyed toward the sheet reading position Y.

  In the embodiment, the case where the sheet P is skewed in the diagonally left direction has been described. However, the case where the sheet P is skewed in the opposite direction (rightward) to the embodiment is similarly skewed. Correction can be performed.

  FIG. 8 is a process diagram showing a process before correcting the skew of the large-sized sheet P. As shown in FIG. 8, when the sheet P is conveyed in the sheet conveying direction Z while being skewed in the left oblique direction, one side (right side) of the leading end portion of the sheet P in the sheet conveying direction Z is aligned with the sheet leading end. It contacts the contact portion 23a. In this case, since the sheet leading edge abutting portion 23a is urged in the direction opposite to the sheet conveying direction Z by its own weight, the sheet P rotates the sheet leading edge abutting portion 23a against the urging force. I can't. Therefore, in this state, the sheet P is prevented from advancing at the portion that is in contact with the sheet tip contact portion 23a, and a loop is formed.

  On the other hand, at this time, since the sheet P is skewed in the diagonally left direction, the other side (left side) of the leading end portion in the sheet conveying direction Z of the sheet P is the sheet leading end of the second regulating member 23. It has not reached | abutted to the contact part 23b. Then, the other side (left side) of the leading end portion of the sheet P in the sheet conveying direction Z is continuously conveyed by the separation roller 8 without being in contact with the sheet leading end abutting portion 23b.

  FIG. 9 is a process diagram illustrating a process after the skew of the large size sheet P is corrected. As shown in FIG. 9, the other side (left side) of the leading end portion of the sheet P in the sheet conveying direction Z comes into contact with the sheet leading end contact portion 23b. Here, the skew of the sheet P is corrected.

  In this state, the sheet P comes into contact with both the sheet front end contact portion 23a and the sheet front end contact portion 23b, and the stiffness due to the loop of the sheet P overcomes the urging force of the second regulating member 23. 2 The regulating member 23 can be pushed and rotated.

  Further, the sheet leading edge abutting portions 24a and 24b are arranged with a predetermined amount of displacement downstream of the sheet leading edge contacting portions 23a and 23b in the sheet conveying direction Z. For this reason, even if the large-size sheet P is conveyed in the sheet conveyance direction Z, the large-size sheet P does not contact the sheet front end contact portions 24a and 24b, but the sheet front end contact portions 23a and 23b. Abut. For this reason, the sheet leading edge abutting portions 23a and 23b can reliably correct the skew of the large size sheet P.

  Here, since the sheet P is conveyed by the separation roller 8 provided in the central portion in the sheet width direction W, the position of the first restriction member 24 closer to the separation roller 8 is closer to the second restriction member 23. The stiffness of the sheet P is stronger than the position.

  For this reason, the urging force of the sheet tip contact portions 24a and 24b is set to be stronger than that of the sheet tip contact portions 23a and 23b. Composed. Thereby, the 1st control member 24 can rotate, without the front-end | tip buckling or jamming.

  As described above, the sheet P is skew-corrected by the first restricting member 24, and then the second restricting member 23 and the first restricting member 24 are rotated so that the sheet P is conveyed by the conveying roller 13 and the driven roller. 33 and conveyed toward the sheet reading position Y.

  As described above, according to the present invention, in the sheet width direction W, the dimension of the separation roller 8 is set to be smaller than the dimension between the conveying roller 13 and the driven roller 33. For this reason, with respect to the sheet P, in the sheet width direction W, the waist of the central portion of the sheet P is stronger than the waist of the outer portion of the sheet P. On the other hand, the first load T1 of the pair of sheet tip contact portions 24a and 24b is set larger than the second load T2 of the pair of sheet tip contact portions 23a and 23b. For this reason, when a large-sized sheet P is conveyed, the pair of sheet leading end contact portions 24a and 24b strongly pushes back the central portion of the leading end portion of the sheet P in the sheet conveying direction Z. Further, the pair of sheet front end abutting portions 23 a and 23 b normally pushes back the outer portion of the front end portion of the sheet P in the sheet conveying direction Z. As a result, the large-sized sheet P receives a reversing force according to the waist of the sheet P on the leading end side in the sheet conveying direction Z, and corrects the skew feeding of the large-sized sheet P at the central portion of the leading end in the sheet conveying direction Z. Damage is reduced.

  Compared with the large size sheet P, the small size sheet P is formed with a small size in the sheet conveyance direction Z, and therefore, the skew of the small size sheet P is likely to occur. The first load T1 of the pair of sheet tip contact portions 24a and 24b is set to be larger than the second load T2 of the pair of sheet tip contact portions 23a and 23b. Therefore, particularly when a small-sized sheet P is conveyed, the pair of sheet leading end contact portions 24a and 24b strongly pushes back the leading end portion of the sheet P in the sheet conveying direction Z. As a result, the small-size sheet P receives a pushing force according to the waist of the sheet P on the leading end side in the sheet conveyance direction Z, and the reliability of the skew correction of the small-size sheet P is improved. As a result, the reliability of skew correction with respect to various sizes of sheets P is improved. In addition, such a configuration is inexpensive.

  Since the dimension of the separation roller 8 in the sheet width direction W is small, the separation roller 8 does not rub the entire surface of the sheet P. Therefore, in the process in which the sheet P passes through the separation roller 8, if an external force is applied to the sheet P, the traveling direction of the sheet P is changed.

  The sheet leading edge abutting portions 24a and 24b are disposed downstream of the sheet leading edge abutting portions 23a and 23b in the sheet conveying direction Z. Accordingly, the skew of the large-size sheet P is corrected by the outer sheet front end contact portions 23a and 23b. Further, the skew of the small-sized sheet P is corrected by the inner sheet front end abutting portions 24a and 24b. In both the large size and the small size, the skew of the sheet P is corrected at the outer portion in the sheet width direction W as much as possible. As a result, the skew of the small size sheet P is reduced.

  The small-sized sheet P may be skewed after being conveyed by the separation roller 8. According to the skew correction device 22, the probability that the small-size sheet P conveyed by the separation roller 8 is skewed is reduced.

  In the above-described embodiment, the first restricting member 24 and the second restricting member 23 are configured to be attached to the driven roller shaft 33a of the driven roller 33, but are not limited to the above embodiment. That is, the first restricting member 24 and the second restricting member 23 may be disposed at any position as long as the first restricting member 24 and the second restricting member 23 are located downstream of the separation roller 8 in the sheet conveying direction Z. In this case, the 1st control member 24 and the 2nd control member 23 should just be comprised so that a predetermined axis | shaft may be provided separately and this center axis may be rotated.

  In the above-described embodiment, the second regulating member 23 is configured to apply the second load T2 in the direction opposite to the sheet conveying direction Z by its own weight, but is not limited to the above embodiment. That is, a configuration in which an urging spring as “second urging means” is separately provided for the second restricting member 23 may be employed.

  Moreover, you may make it the structure which both the 1st control member 24 and the 2nd control member 23 rotate with dead weight. However, also in this case, the first load T1 of the first regulating member 24 must be set larger than the second load T2 of the second regulating member 23.

8. Separation roller (separation transport means) (first transport means)
13 ······ Conveying roller (second conveying means)
23... Second regulating member 24... First regulating member 23 a, 23 b Seat leading edge contact portion (second regulating piece)
24a, 24b. Sheet tip contact portion (first regulating piece)
33 ··· driven roller (second conveying means)
T1 ······ First load T2 ········ Second load P ··············· W direction

Claims (3)

First conveying means for conveying a sheet in a sheet conveying direction in which the sheet is conveyed;
A second conveying means that is provided downstream of the first conveying means in the sheet conveying direction and conveys the sheet;
A pair of first restrictions provided on the downstream side of the first conveying means and abutting against the leading end portion of the sheet in the sheet conveying direction to restrict the progress of the sheet while applying a first load in a direction opposite to the sheet conveying direction. With a piece,
A sheet width direction orthogonal to the sheet conveying direction is provided on the outer side of the pair of first restricting pieces and on the downstream side of the first conveying unit in the sheet conveying direction, and is in contact with the leading end of the sheet in the sheet conveying direction. A pair of second regulating pieces that regulate the progress of the sheet while applying a second load in the direction opposite to the sheet conveying direction,
In the sheet width direction, the dimension of the first conveying means is set to be smaller than the dimension between the pair of second restricting pieces, and the first load of the first restricting piece is set to be greater than the second load of the second restricting piece. A skew correction device, wherein the skew correction of the sheet is corrected by setting a larger value.   2. The skew correction device according to claim 1, wherein the first restricting piece is provided downstream of the second restricting piece in a sheet conveyance direction.   3. The skew feeding correction apparatus according to claim 1, wherein the first conveyance unit is a separation conveyance unit that separates and conveys one sheet from a plurality of sheets.