JP2016023070A - Sheet feeding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet feeding device that can retreat a feeding rotation body at the timing when a sheet reaches conveying means.SOLUTION: A sheet feeding device comprises a pick-up roller 104 that feeds out a sheet S on an intermediate plate 101 and a roller bearing portion 302 that supports a rotating pick-up roller shaft 301; and further, comprises a separating/conveying portion 105 that is arranged on a downstream side in a sheet feeding direction of the pick-up roller 104 and conveys the sheet S fed by the pick-up roller 104 at a speed higher than a speed of the roller 104. The roller bearing portion 302 supports rotatably one end side of the shaft 301 in the sheet feeding direction, with the other end side of the shaft 301 of the pick-up roller 104 as a center. When the sheet S contacting the pick-up roller 104 is conveyed by the separating/conveying portion 105, the roller 104 contacting the sheet S is turned in the sheet feeding direction by movement of the sheet S conveyed by the separating/conveying portion 105.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a sheet feeding apparatus that is provided in an image forming apparatus such as a copying machine or a printer and separates and feeds sheets one by one.

  In general, an image forming apparatus such as a copying machine, a facsimile machine, or a printer is configured to separate sheets one by one by a sheet feeding device from a sheet storage unit that stores sheets to the image forming unit. Yes. Then, after the toner image formed on the photosensitive drum of the image forming unit is transferred to the sheet by the transfer unit, the sheet is conveyed to a fixing device and heated to fix the toner image on the sheet. Further, the sheet carried out from the fixing device is guided to the paper discharge side and discharged onto the stacking tray. Hereinafter, the sheet feeding apparatus will be described in detail.

  In general, a sheet is stacked on an intermediate plate, and is held by an upper limit stopper so that the uppermost position of the sheet is positioned at a predetermined height by an intermediate plate spring that urges the intermediate plate upward. The uppermost sheet, which is set to a predetermined height by the middle plate, is fed to the separation unit by a half-moon pickup roller. After the pickup roller feeds the sheet by the semicircular rubbing portion, the rubbing portion retreats upward.

  The separation unit includes a feed roller and a retard roller that presses against the feed roller, and the retard roller is provided with a torque limiter. The feed roller is configured to rotate in a direction in which the sheet is conveyed to the image forming unit on the downstream side in the conveyance direction, and the retard roller is configured to rotate in a direction to convey the sheet to the sheet storage unit on the upstream side in the conveyance direction. If the number of sheets fed to the separation unit is one, the retard roller is driven by the torque limiter and is driven to rotate following the feed roller. If there are two or more sheets fed to the separation unit, the retard roller is driven by the torque limiter without acting, and rotates reversely with respect to the feed roller, and the sheets other than the uppermost sheet are accommodated in the sheet. The uppermost sheet is separated into one sheet by returning to the direction of the part.

  However, the conventional sheet feeding apparatus has the following problems. That is, the pick-up roller is used for processing when the sheet storage unit is detached from the image forming apparatus in order to replenish the sheet storage unit, or when a sheet is jammed at the separation feeding portion. In addition, it is configured to retreat upward.

  Further, when the pickup roller is retracted upward, when the separation unit separates the sheets into one sheet, the retard roller can easily return the sheet other than the uppermost sheet toward the sheet storage unit, and the separation property can be improved. Furthermore, if the pickup roller, the feed roller, and the retard roller are in contact with the sheet, the sheet is pulled between the rollers, and the roller slides on the sheet surface. And roller wear is promoted. Therefore, it is desirable that the pickup roller be separated from the sheet when the leading edge of the sheet reaches the separation unit.

  As such a retracting configuration of the pickup roller, a configuration using a solenoid is known (see Patent Document 1). In the technique described in Patent Document 1, a pickup roller is supported by a roller support member that can swing around a feed roller shaft, and a one-way clutch in which a rotation direction opposite to a rotation direction of sheet feeding is a connection direction is provided on the feed roller shaft. And a reverse rotation preventing member. Further, the reverse rotation preventing member is in contact with the lower side surface of the roller support member. As a result, the pickup roller can be separated from the sheet when the feed roller is stopped.

JP 2003-276872 A

  According to the technique described in Patent Document 1, the pickup roller can be oscillated using a reverse drive of the retard roller when the sheets are double-fed using a one-way clutch as a cheaper configuration. However, according to this configuration, since the pickup roller is retracted only when the sheets are double-fed, it is difficult to prevent charging traces and roller wear when feeding one sheet.

  SUMMARY An advantage of some aspects of the invention is that it provides a sheet feeding device capable of retracting a feeding rotating body such as a pickup roller when the sheet reaches a conveying unit such as a separation unit.

  The present invention provides a sheet feeding device, a sheet stacking unit on which sheets are stacked, a feeding rotating body that feeds a sheet by rotating in contact with the sheets stacked on the sheet stacking unit, and the rotating feeding unit. A shaft support means for supporting the shaft of the feeding rotator and a sheet that is disposed downstream of the feeding rotator in the sheet feeding direction, and conveys the sheet fed by the feeding rotator at a higher speed than the feeding rotator. Conveying means, and the shaft support means rotatably supports the other end side of the shaft in the sheet feeding direction around the one end side of the shaft of the feeding rotating body, and the feeding When the sheet in contact with the rotating body is conveyed to the conveying means, the feeding rotating body in contact with the sheet is rotated in the sheet feeding direction by the movement of the sheet conveyed to the conveying means. It is characterized by that.

  According to the present invention, when the sheet in contact with the feeding rotating body is conveyed to the conveying means, the feeding rotating body in contact with the sheet is moved in the sheet feeding direction by the movement of the sheet conveyed to the conveying means. It is reliably rotated. For this reason, when the sheet reaches the conveying means, the feeding rotating body is always withdrawn from the sheet stacking portion, so that it becomes possible to prevent charging traces and roller wear during sheet feeding, and separation performance. Can be improved, the trace of charging can be eliminated, and the life of the roller can be extended.

1 is a schematic cross-sectional view illustrating a sheet feeding apparatus according to an embodiment of the present invention and an image forming apparatus including the sheet feeding apparatus in a longitudinal cross-sectional state. FIG. 3 is a perspective view illustrating an appearance of a sheet feeding cassette provided in the sheet feeding apparatus according to the present embodiment. It is a perspective view which expands and shows the side control board in a paper feed cassette. FIG. 3 is a perspective view illustrating an appearance of a separation feeding drive unit of the sheet feeding apparatus according to the present embodiment. FIG. 5 is a perspective view illustrating a separation feeding drive unit of the sheet feeding apparatus according to the present embodiment as viewed from a direction different from that in FIG. 4. FIG. 2 is a perspective view illustrating an appearance of a sheet feeding apparatus according to the present embodiment. (A) is sectional drawing which shows the state immediately after feeding the sheet | seat in the sheet feeding apparatus of this embodiment, (b) is sectional drawing which shows the state in which the fed sheet reached | attained the separation part. .

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. First, a sheet feeding apparatus including a paper feeding cassette that is mounted on a laser beam printer, which is an example of an image forming apparatus, will be described with reference to FIG. FIG. 1 is a schematic cross-sectional view illustrating a sheet feeding apparatus according to the present embodiment and an image forming apparatus including the sheet feeding apparatus in a longitudinal cross-sectional state.

  As shown in FIG. 1, the image forming apparatus 10 includes an apparatus main body 10a. A sheet feeding cassette 100 is detachably attached to the apparatus main body 10a, and a pickup roller 104 as a feeding rotating member, a feed roller 106 as a conveying rotating member, and a retard roller 107 as a separating rotating member. Each is provided rotatably. The pickup roller (feeding rotator) 104 feeds the sheet S by rotating in contact with the sheet S stacked on the intermediate plate 101 as a sheet stacking unit. The apparatus main body 10 a is provided with a control unit 21 that controls each unit of the image forming apparatus 10.

  The paper feed cassette 100 has a cassette main body 100a, and a middle plate 101 as a sheet stacking portion in which a rotation shaft 109 at the rear end portion is rotatably supported in an accommodating portion 116 of the cassette main body 100a. Yes. That is, the middle plate 101 is supported by the cassette body 100a so that the rotation shaft 109 at the rear end portion in the longitudinal direction is pivotally supported, and the front end portion is pushed up by the push-up spring 102, and the sheets S stacked on the middle plate 101 (see FIG. 7) is urged toward the pickup roller 104. A reference numeral 103 in FIG. 1 indicates an upper limit stopper for holding the uppermost sheet on the intermediate plate 101 (on the sheet stacking portion) at a predetermined height by the lifting spring 102.

  As shown in FIG. 2, side regulating plates 110 are respectively arranged on both sides in the width direction B orthogonal to the sheet feeding direction A in the cassette body 100 a. Separating claws 111 as sheet height regulating means for separating the sheets S stacked on the middle plate 101 one by one are rotatable about the support shaft 112 in the side regulating plates 110 on both sides. So that it is supported.

  As shown in FIG. 3, the separation claw 111 provided on the side regulating plate 110 is provided with a stopper portion 113 that projects laterally from the side regulating plate 110. Further, the protrusion 114 provided as a contact portion on the upper surface of the intermediate portion of the separation claw 111 abuts against the stopper portion 113 provided on the side regulating plate 110 from below, so that the separation claw 111 rotates upward. The moving position is regulated.

  With the above configuration, the middle plate 101 and the sheet S on the middle plate are pushed upward by the push-up spring 102 (FIG. 1), but the protrusion 114 abuts against the stopper portion 113, so that the height exceeds a predetermined height. Without being pushed up, it stands by at the position shown in FIGS.

  The sheet feeding cassette 100, the middle plate 101, the separation claw 111, and the side regulating plate 110 constitute a sheet stacking unit. Further, the separation claw 111 may be a separation claw used for a so-called separation mechanism, and may be configured so that the sheet S can pass above the separation claw 111 after being locked by the sheet height regulating portion and the pickup roller 104. That's fine.

  Next, with reference to FIG. 1, a separation / conveying configuration including the pickup roller 104 and the separation / conveying unit 105 will be described.

  As shown in FIG. 1, the pickup roller 104 includes a pickup roller shaft 301, a roller rubber portion 104 a formed in an arc shape centering on the shaft 301, and a linear flat portion 104 b passing through the shaft 301. It is a half-moon shaped roller as a whole. The pickup roller shaft 301 is rotatably supported by a roller bearing portion (shaft support means) 302 provided on the apparatus main body 10a side. The pickup roller 104 that rotates about the shaft 301 faces the flat portion 104b in a state in which the flat portion 104b is not in contact with the sheet S on the intermediate plate 101 as shown in FIG.

  The roller rubber portion 104a of the pickup roller 104 has an arc distance so that the sheet S can be sent to the separation conveyance unit 105 as a conveyance unit by one rotation (or n rotations (n = 2, 3, 4,...)). Is set. The separation conveyance unit 105 is disposed downstream of the pickup roller 104 in the sheet feeding direction indicated by the arrow A, and separates and conveys the sheets S fed by the pickup roller 104 one by one. The separation conveying unit (conveying means) 105 is disposed downstream of the pickup roller 104 in the sheet feeding direction A (downstream side of the sheet feeding direction), and the sheet S fed by the pickup roller 104 is faster than the pickup roller 104. Transport by.

  The separation conveyance unit 105 includes a feed roller 106 as a conveyance rotation body, and a retard roller 107 as a separation rotation body that rotates in reverse to the feed roller 106. The feed roller 106 is configured to rotate in the same direction (in the direction of arrow E) as the rotation direction of the pickup roller 104 (in the direction of arrow D). The retard roller 107 abuts on the feed roller 106 and can be rotated along with the feed roller 106 via the torque limiter 108. The sheet fed by the pickup roller 104 is separated by one sheet at the separation nip portion N1 between the retard roller 107 and the feed roller 106. Separate one by one.

  The torque limiter 108 applies a predetermined torque with respect to the rotation in the direction in which the sheet S is fed to the retard roller 107. The feed roller 106 is rotatably supported on the apparatus main body 10a side by a feed roller shaft 117, and the retard roller 107 is rotatably supported on the apparatus main body 10a side by a retard roller shaft 115. The retard roller 107 is urged toward the feed roller 106 by a spring (not shown) so as to come into pressure contact with the feed roller 106 with a predetermined contact pressure.

  Next, the feeding operation of the separation feeding drive unit 200 in the sheet feeding apparatus of the present embodiment will be described with reference to FIGS. 4 and 5. 4 is a perspective view illustrating an appearance of the separation feeding drive unit 200 of the sheet feeding apparatus according to the present embodiment. FIG. 5 illustrates the separation feeding driving unit 200 from a direction different from that in FIG. It is a perspective view shown in the state seen.

  That is, as shown in FIGS. 4 and 5, the separation / feed driving unit 200 includes an input gear 201 rotatably supported by an input gear shaft 201 a and a pickup roller gear 203 fixed to one end of the pickup roller shaft 301. And have. Drive from the feed motor 20 as a drive source is transmitted to the input gear 201. The separation / feed driving unit 200 has a feed roller gear 204 fixed to one end of the feed roller shaft 117 and a feed idler gear 220 fixed to the center of the feed roller shaft 117.

  Further, the separation feed driving unit 200 includes a retard roller gear 205 fixed to one end of the retard roller shaft 115, a retard idler gear 206 rotatably supported by an idler gear shaft 206a, a chipped gear train 202, and a feed. A solenoid 207 is provided. The chipped gear train 202 includes an input idler gear 208, a pickup idler gear 209, and a feed idler gear 210.

  The input idler gear 208 has a missing tooth portion 208a and a toothed portion 208b, the pickup idler gear 209 has a missing tooth portion 209a and a toothed portion 209b, and the feed idler gear 210 has a missing tooth portion 210a and a toothed portion. 210b. The input idler gear 208, the pickup idler gear 209, and the feed idler gear 210 are configured such that the chipped portions 208a, 209a, and 210a and the toothed portions 208b, 209b, and 210b are engaged with each other and rotate together. .

  A rotating cam 211 that engages and disengages the lever portion 207a of the feeding solenoid 207 is attached to any one of the input idler gear 208, the pickup idler gear 209, and the feed idler gear 210. It should be noted that the feeding solenoid 207 is schematically illustrated except for the lever portion 207a.

  The rotating cam 211 is urged to rotate in the direction of the arrow L1 in FIG. 4 by an urging member (not shown). The rotary cam 211 is configured such that the lever portion 207a and the engaging portion 211a are located at positions where the input gear 201 and the missing tooth portion 208a, the pickup roller gear 203 and the missing tooth portion 209a, and the feed roller gear 204 and the missing tooth portion 210a are in close proximity. Engage to prevent rotation.

  Then, when the feeding motor 20 is rotated by a printing command issued from the control unit 21 (FIG. 1), the input gear 201 is driven to rotate, and further, the solenoid 207 is turned on by a feeding command from the control unit 21. As a result, the lever portion 207a is disengaged from the engaging portion 211a of the rotating cam 211, and the toothless gear is moved by the biasing member (not shown) to the position where the toothed portion 208b of the input idler gear 208 meshes with the input gear 201. Row 202 rotates.

  When the chipped gear train 202 starts to rotate, the toothed portion 209b of the pickup idler gear 209 meshes with the pickup roller gear 203, and the pickup roller gear 203 starts to rotate. For this reason, the pickup roller 104 starts to rotate via the pickup roller shaft 301.

  When the chipped gear train 202 further rotates, the toothed portion 210b of the feed idler gear 210 meshes with the feed roller gear 204, and the feed roller gear 204 starts to rotate. Then, the retard roller gear 205 rotates via the feed idler gear 220 and the retard idler gear 206. As a result, the feed roller 106 and the retard roller 107 rotate.

  When the chipped gear train 202 further rotates, the pickup roller gear 203, the feed roller gear 204, and the input gear 201 are respectively driven by the chipped tooth portions 209a, 210a, and 208a of the chipped gear train 202 to stop rotating. To do. When the solenoid 207 is turned off by a stop command from the control unit 21, the lever unit 207a is engaged with the engaging unit 211a again, and the feeding operation is completed.

  The gear trains such as the input gear 201, the chipped gear train 202, the pickup roller gear 203, and the feed roller gear 204 described above constitute drive means together with the feed motor 20. That is, this driving means includes a feeding motor 20 as a driving source and a gear train (201, 202, 203, 204) that transmits the rotation of the feeding motor 20 to the separation conveyance unit 105 and the pickup roller 104. The driving unit drives the separation conveyance unit 105 and the pickup roller 104 so that the sheet conveyance speed by the separation conveyance unit 105 is faster than the sheet conveyance speed by the pickup roller 104.

  The gear train (201 to 204) is set to a gear ratio such that the sheet conveyance speed by the separation conveyance unit 105 is faster than the sheet conveyance speed by the pickup roller 104. In this case, the separation conveyance unit 105 and the pickup roller 104 can be in an appropriate speed relationship only by setting the gear ratio.

  Next, the feeding operation by the pickup roller 104, the feed roller 106, and the retard roller 107 will be described with reference to FIGS. FIG. 6 is a perspective view showing an appearance of the sheet feeding apparatus according to this embodiment. 7A is a cross-sectional view illustrating a state immediately after the sheet is fed in the sheet feeding apparatus illustrated in FIG. 6, and FIG. 7B is a diagram illustrating the sheet fed in FIG. It is sectional drawing which shows a state when a front-end | tip has reached the isolation | separation part.

  As shown in FIG. 6, the pickup roller shaft 301 is connected to the pickup roller gear 203 at one end, and rotates when the drive of the feeding motor 20 is transmitted from the pickup roller gear 203. Further, the pickup roller shaft 301 has a joint configuration that is movable in the XZ biaxial direction with the roller gear engaging portion 301a of the pickup roller gear 203 as a fulcrum.

  Further, as shown in FIGS. 7A and 7B, the pickup roller shaft 301 is held by a roller bearing portion 302. The roller bearing 302 constitutes a shaft support means that rotatably supports the pickup roller shaft 301 of the pickup roller 104. That is, the roller bearing portion (shaft support means) 302 is centered on one end side (the roller gear engagement portion 301a side) of the shaft 301 of the pickup roller 104 and the other end side of the shaft 301 (in the sheet feeding direction) ( The left side in FIG. 6 is rotatably supported. When the sheet S that is in contact with the pickup roller 104 is conveyed to the separation conveyance unit 105, the pickup roller 104 that is in contact with the sheet S is fed by movement of the sheet S conveyed to the separation conveyance unit 105. It is rotated in the feeding direction. The roller bearing unit 302 serves as a guide unit that guides the pickup roller 104 that receives a pulling force when the sheet sent out by the pickup roller 104 is started to be transported by the separation transport unit 105 in a direction away from the sheet on the intermediate plate 101. It has a bearing portion 302a.

  The bearing portion 302a as the guide portion has a guide hole 302b that is inclined in a direction in which the pickup roller shaft 301 of the pickup roller 104 is moved obliquely upward downstream in the sheet feeding direction to separate the pickup roller 104 from the intermediate plate 101. ing. Then, the pickup roller shaft 301 guided in the guide hole 302b has a pickup return spring (biasing means) in a direction to return the pickup roller 104 to the initial position (position shown in FIG. 7A) before receiving the pulling force. ) 303. That is, the pickup roller shaft 301 is movably supported along the bearing portion 302a, but is urged to the initial position of the bearing portion 302a by a pickup return spring 303 (see FIG. 6) formed of a compression spring.

  The guide hole 302b is a straight line connecting the feeding position F (FIG. 7A) where the roller rubber portion 104a contacts the sheet S on the intermediate plate 101 and the separation nip portion N1 between the feed roller 106 and the retard roller 107. It is comprised in the shape of an oblong hole (long hole shape) extended along. Thereby, when receiving the pulling force, the pickup roller 104 can be reliably guided in the direction away from the sheet S on the intermediate plate (normal direction of the pickup roller shaft 301).

  Then, when the pickup motor 104 starts rotating by driving the feeding motor 20 in accordance with a command (command) of the control unit 21, the uppermost sheet of the intermediate plate 101 and the roller rubber portion 104a of the pickup roller 104 come into contact with each other and are sent out. (FIG. 7A). As a result, the sheet S is introduced into the separation nip portion N1 between the feed roller 106 and the retard roller 107, and is conveyed downstream while being sandwiched by the separation nip portion N1. In this case, the conveyance speed of the feed roller 106 of the separation conveyance unit 105 is set to be higher than the conveyance speed of the pickup roller 104.

  Accordingly, when the sheet S is transported by the feed roller 106 and the retard roller 107, a force (pulling force) that pulls the pickup roller 104 in the direction of the separation transport unit 105 is generated due to a transport speed difference from the pickup roller 104. Therefore, the pickup roller 104 moves while rotating along the guide hole 302b of the bearing portion 302a with the roller gear engaging portion 301a (FIG. 6) of the pickup roller shaft 301 and the pickup roller gear 203 as a fulcrum.

  For this reason, when the pickup roller 104 moves obliquely forward and upward, the pressure contact state between the roller rubber portion 104a of the pickup roller 104 and the sheet S being conveyed and the remaining sheet on the intermediate plate is released. Thereby, the load at the time of separating the sheet S fed by two or more sheets by the separation conveyance unit 105 can be reduced, and the separation performance can be improved. Furthermore, the load on the pickup roller 104 can be reduced even when one sheet is conveyed by the separation conveyance unit 105.

  According to the above-described embodiment, the pickup roller 104 that receives a pulling force via the sheet started to be transported by the separation transport unit 105 is reliably guided in a direction away from the sheet on the intermediate plate 101 with an inexpensive configuration. Is possible. For this reason, by always retracting the pickup roller 104 from the intermediate plate 101 when the sheet reaches the separating and conveying unit 105, it becomes possible to prevent charging traces and roller wear when feeding one sheet. As a result, it is possible to improve the separation performance, eliminate the charge trace, and extend the roller life.

  As mentioned above, although this embodiment was described, it cannot be overemphasized that this invention can be variously deformed in the range which is not limited to the said embodiment and does not deviate from the summary. For example, in the above-described embodiment, the present invention is applied to a laser beam printer, but the present invention is also applicable to other image forming apparatuses such as a copying machine.

  In the above-described embodiment, the present invention is applied to the half-moon pickup roller 104 and the retard separation structure in which the retard roller 107 is reversed with respect to the feed roller 106. However, the present invention is not limited to this, and it goes without saying that the present invention can be similarly applied to a cylindrical pick-up roller and a separation / conveying section constituted by a feed roller and a separation pad.

  20... Drive means, drive source (feed motor) / 101... Sheet stacking section (medium plate) / 104... Feed rotation body (pickup roller) / 105... Transport means (separation transport section) / 106. Feed roller) / 107 ... Separation rotating body (retard roller) / 108 ... Torque limiter / 201 to 204 ... Driving means, gear train (input gear, chipped gear train, pickup roller gear, feed roller gear) / 301 ... feed Shaft of rotating body (pickup roller shaft) / 302 ... Shaft support means (roller bearing part) / 302b ... Guiding part (guide hole) / 303 ... Biasing means (pickup return spring) / N1 ... Separation nip part / S ... Sheet

Claims (5)

A sheet stacking unit on which sheets are stacked;
A feeding rotating body that feeds out a sheet by rotating in contact with the sheet stacked on the sheet stacking unit;
Shaft support means for supporting the shaft of the feeding rotating body that rotates,
A conveying means that is disposed downstream of the feeding rotating body in the sheet feeding direction, and conveys the sheet fed by the feeding rotating body at a higher speed than the feeding rotating body,
The shaft support means rotatably supports the other end side of the shaft in the sheet feeding direction around the one end side of the shaft of the feeding rotating body, and is in contact with the feeding rotating body When the sheet is conveyed to the conveying unit, the feeding rotating body that is in contact with the sheet is rotated in the sheet feeding direction by the movement of the sheet conveyed to the conveying unit.
A sheet feeding apparatus characterized by that. The shaft support means guides the feeding rotating body that receives a pulling force when the sheet fed by the feeding rotating body is started to be conveyed by the conveying means in a direction away from the sheet on the sheet stacking unit. Having a guiding part,
The guide portion includes a guide hole that is inclined in a direction to move the shaft of the feeding rotation body obliquely upward downstream in the sheet feeding direction to separate the feeding rotation body from the sheet stacking portion. ,
The sheet feeding apparatus according to claim 1. The shaft guided by the guide portion is biased by a biasing means in a direction to return the feeding rotating body to an initial position before receiving the pulling force.
The sheet feeding apparatus according to claim 2, wherein the sheet feeding apparatus is a sheet feeding apparatus. The conveying means is
A transport rotator that rotates in the same direction as the rotation direction of the feed rotator;
One sheet is brought into contact with the conveying rotator and can be rotated together with the conveying rotator via a torque limiter, and is fed by the feeding rotator at a separation nip portion with the conveying rotator. A separating rotating body that separates each one,
The sheet feeding device according to any one of claims 1 to 3, wherein the sheet feeding device is provided. Drive means for driving the conveying means and the feeding rotating body so that the conveying speed of the sheet by the conveying means is faster than the conveying speed of the sheet by the feeding rotating body;
The driving means includes
A driving source;
A gear train for transmitting the rotation of the drive source to the conveying means and the feeding rotating body,
The gear train is set to a gear ratio at which a sheet conveying speed by the conveying unit is faster than a sheet conveying speed by the feeding rotating body.
The sheet feeding device according to any one of claims 1 to 4, wherein the sheet feeding device is provided.

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