JP2008074499A - Method for controlling sheet material feeding device and sheet material feeding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for controlling a sheet material feeding device and the sheet material feeding device capable of sequentially feeding the sheet material from the top one by one even though the sheet material on a hopper is uneven. <P>SOLUTION: The sheet material feeding device comprises a hopper 1 loaded with the sheet material and capable of rising/descending, a pickup roller 2 for letting out the sheet material on the hopper 1, a separation roller 3 for conveying the sheet material let out by the pickup roller 2 to the sending direction, and a retard roller 4 press-contacting to the separation roller 3 by an idling load at a predetermined pressure to give a separating effect to the sheet material. The sheet material is let out in a status of stopping/holding the separation roller 3 and the retard roller 4, and the pickup roller 2 is driven until the sheet material let out is nipped by the separation roller 3 and the retard roller 4 and stops its motion. The separation roller 3 is driven after the pickup roller 4 stops. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a control method and a sheet material supply apparatus for a sheet material supply apparatus that continuously supplies a sheet material into an apparatus main body such as an image forming apparatus or an image reading apparatus.

  A conventional sheet material supply apparatus will be described with reference to a longitudinal sectional view showing a schematic configuration of the conventional sheet material supply apparatus in FIG. 7 and an operation explanatory diagram of the conventional sheet material supply apparatus in FIG.

  As shown in FIG. 7, a pickup roller 2 that feeds out the sheet material S stacked on the hopper 1 in order to continuously supply the sheet material S one by one into the apparatus main body such as an image forming apparatus or an image reading apparatus. And the separation roller 3 and the retard roller 4 in contact with each other have a separation mechanism for rolling the sheet material S.

  In this separation mechanism, the pickup roller 2 is brought into contact with the sheet material S on the hopper 1 with a predetermined load, and the sheet material S is fed out one by one by the rotation of the pickup roller 2, such as an image forming apparatus or an image reading apparatus. Send it into the body.

  In addition, some recent sheet material supply apparatuses have the pickup roller 2 separated from the sheet material S at the time when the sheet roller is engaged with the transport roller 20 in the next stage, thereby eliminating the influence of the contact pressure of the pickup roller 2.

Further, for example, (Patent Document 1) includes a mechanism that eliminates a moving mechanism for moving the pickup roller up and down as in the prior art by feeding sheet materials one by one with a half-moon shaped feeding roller.
JP-A-6-009079

  By the way, in these sheet material supply apparatuses, when a bundle of sheet materials S having different sizes and not aligned is supplied, there is no problem when the uppermost sheet material S is in contact with the pickup roller 2.

However, as shown in FIG. 8 (a), the sheet S ₁ of the uppermost shifted backward, if the second sheet following the sheet S ₂ from the top is in contact, the uppermost sheet S ₁ Is fed between the separation roller 3 and the retard roller 4 by the pickup roller ₂ together with the _second sheet material S ₂ or less, so that the rolling force of the retard roller 4 is not transmitted to the uppermost sheet material S ₁ and cannot be separated. There is a problem of double feeding.

  Therefore, in the present invention, there is provided a control method for a sheet material supply apparatus and a sheet material supply apparatus capable of supplying sheets one by one from the uppermost sheet material even if the sheet materials on the hopper are uneven. With the goal.

  In order to solve the above-described problems, the present invention provides a hopper capable of moving up and down on which a sheet material is stacked, a pickup roller that feeds out the sheet material on the hopper, and a separation roller that conveys the sheet material fed out by the pickup roller in the feeding direction. And a retard roller that presses against the separation roller at a predetermined pressure with an idling load and imparts a sheeting effect to the sheet material, and the pickup roller is in a state where the separation roller and the retard roller are stopped and held The sheet is fed out, and the fed sheet material is nipped by the separation roller and the retard roller, and is driven until the movement is stopped, and the separation roller is driven after the pickup roller is stopped.

  According to the present invention, even if the sheet materials on the hopper are uneven, it is possible to sequentially feed the sheets one by one from the uppermost sheet material, and to prevent double feeding.

  The first invention of the present application includes a hopper capable of moving up and down on which sheet materials are stacked, a pickup roller that feeds out the sheet material on the hopper, a separation roller that conveys the sheet material fed out by the pickup roller in the feeding direction, A control method for a sheet material supply apparatus having a retard roller that is brought into pressure contact with a separation roller at a predetermined pressure with an idling load and imparts a rolling effect to the sheet material, wherein the pickup roller is stopped and held by the separation roller and the retard roller The sheet material is fed out, and the fed sheet material contacts the nip position between the separation roller and the retard roller and is driven until the movement stops, and the separation roller is driven after the pickup roller is stopped. It is a control method of a material supply apparatus.

  According to the present invention, the pickup roller feeds the sheet material in a state where the separation roller and the retard roller are stopped and held, and the fed sheet material comes into contact with the nip position between the separation roller and the retard roller to stop the movement. Even if the sheet material on the hopper is uneven, it is aligned at the nip position by the separation roller and the retard roller. The separation roller is driven after the pickup roller is stopped, so that the separation roller is sequentially supplied one by one from the uppermost sheet material.

  A second invention of the present application is a method for controlling a sheet material supply apparatus, including stopping a separation roller when the sheet material is nipped by a next-stage conveyance roller.

  According to the present invention, after the uppermost sheet material is nipped by the next conveying roller, the uppermost sheet material is conveyed by the conveying roller. The sheet material below the mesh is not conveyed by the separation roller, and it can be prevented from being fed together with the uppermost sheet material.

  According to a third aspect of the present invention, there is provided a sheet material supply apparatus including a driving device that repeatedly drives a stopped separation roller until the sheet material nipped by the separation roller and the retard roller disappears after the sheet material is conveyed by the conveyance roller. It is a control method.

  According to the present invention, the separation roller is driven after the uppermost sheet material has passed, whereby the second and subsequent sheet materials at the nip position between the separation roller and the retard roller are sequentially conveyed by the separation roller.

  According to a fourth aspect of the present invention, when there is no sheet material nipped by the separation roller and the retard roller, the pickup material is fed out in a state where the separation roller and the retard roller are stopped and held. Is a control method of the sheet material supply apparatus including driving until the movement stops after contacting the nip position between the separation roller and the retard roller.

  According to the present invention, when the sheet material nipped by the separation roller and the retard roller disappears, the next sheet material can be fed out from the hopper and repeatedly supplied one by one.

  A fifth invention of the present application includes a hopper capable of moving up and down on which a sheet material is stacked, a pickup roller that feeds out the sheet material on the hopper, a separation roller that conveys the sheet material fed out by the pickup roller in a feeding direction, And a retard roller that presses against the separation roller at a predetermined pressure with an idling load and imparts a rolling effect to the sheet material, and the pickup roller feeds the sheet material in a state where the separation roller and the retard roller are stopped and held. And the separation roller is driven after the pickup roller is stopped.

  According to the present invention, the pickup roller feeds out the sheet material in a state where the separation roller and the retard roller are stopped and held until the sheet material thus fed comes into contact with the nip position between the separation roller and the retard roller and the movement stops. By being driven, even if the sheet material on the hopper is not aligned, it is aligned at the nip position by the separation roller and the retard roller. The separation roller is driven after the pickup roller is stopped, so that the separation roller is sequentially supplied one by one from the uppermost sheet material.

  6th invention of this application is a sheet material supply apparatus provided with the sensor which detects the motion of the sheet material which it pays out with a pick-up roller.

  According to the present invention, the pickup roller and the separation roller can be controlled as described above based on the movement of the sheet material detected by the sensor.

  7th invention of this application is a sheet material supply apparatus provided with the sensor which detects a sheet material in the front | former stage of the nip position of a separation roller and a retard roller.

  According to the present invention, the pickup roller and the separation roller can be controlled as described above by detecting the presence of the sheet material at the nip position between the separation roller and the retard roller by the sensor.

  An eighth invention of the present application is a sheet material supply apparatus including a sensor that detects passage of a sheet material at a subsequent stage of a nip position between a separation roller and a retard roller.

  According to the present invention, when the sheet material is nipped by the conveyance roller of the next stage and the separation roller is stopped, the stopped separation roller is moved to the sheet based on the movement of the rear end of the sheet material detected by the sensor. After the material is conveyed by the conveying roller, it can be repeatedly driven until there is no sheet material nipped by the separation roller and the retard roller.

  A ninth invention of the present application is a sheet material supply apparatus including a conveyance roller provided at a subsequent stage of the separation roller and the retard roller, and a sensor for detecting the sheet material before the nip position of the conveyance roller.

  According to the present invention, as described above, the separation roller can be stopped when the sheet material is nipped by the next-stage transport roller.

  According to a tenth aspect of the present invention, the nip position of the separation roller and the retard roller and the position of the sheet material in the feeding direction are in the vicinity of the same position, and the sheet material is fed from the pickup roller in the width direction of the sheet material conveyance path. It is a sheet material supply apparatus provided with the conveyance prevention mechanism which blocks conveyance of this.

  According to the present invention, when the sheet material fed from the pickup roller is inclined, the nip position of the separation roller and the retard roller and the position in the sheet material feeding direction are in the vicinity of the same position, and the sheet material conveyance path By blocking the conveyance of the sheet material by the conveyance blocking mechanism provided in the width direction, the leading edge of the sheet material can be correctly aligned at the nip position.

  An eleventh aspect of the present invention is a sheet material supply apparatus in which the conveyance blocking mechanism opens and closes the conveyance path.

  According to the present invention, when the sheet material aligned at the nip position between the separation roller and the retard roller is conveyed further downstream by the driving of the separation roller, the conveyance blocking mechanism opens the conveyance path, so that the smooth sheet material is obtained. Can be transported.

  According to a twelfth aspect of the present invention, a pressure detection unit that detects a pressure at which the pickup roller contacts the sheet material, and a pressing force adjustment mechanism that adjusts the pressure detected by the pressure detection unit to a predetermined pressure, It is a sheet | seat material supply apparatus which has this.

  According to the present invention, the feeding of the sheet material is first started at the first set pressure, and when the movement of the sheet material is detected, the pressure can be adjusted to be changed to the predetermined second pressure.

  Normally, when the sheet material is fed out, a contact pressure required to resist static friction until the sheet material starts moving is set as the first set pressure of the pickup roller.

  However, once the sheet material starts to move, the static friction becomes kinetic friction. Therefore, after the sheet material starts to move, the sheet material is removed by continuing feeding with a contact pressure suitable for dynamic friction as the second set pressure. You can pay out.

  Thereby, when the sheet material comes into contact with the nip position, unnecessary pressure is prevented from being applied to the sheet material, and smooth leading edge alignment is possible.

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

  FIG. 1 is a plan view showing a schematic configuration of a sheet material supply apparatus according to an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of FIG.

  1 and 2, a sheet material supply apparatus according to an embodiment of the present invention supplies sheet materials one by one continuously into an apparatus main body such as an image forming apparatus or an image reading apparatus. A liftable hopper 1 on which the material is stacked, a pickup roller 2 that contacts the sheet material on the hopper 1 and feeds the sheet material one by one, a separation roller 3 that conveys the sheet material fed by the pickup roller 2 in the feed direction, The separation roller 3 is constituted by a retard roller 4 or the like that is brought into pressure contact with a predetermined idling load at a predetermined pressure and imparts a rolling effect to the fed sheet material.

  The pickup roller 2, the separation roller 3, and the retard roller 4 are individually connected to driving sources and can be driven independently. Further, the pickup roller 2 and the separation roller 3 are equipped with one-way clutches that rotate (idle) in the transport direction with respect to the respective drive shafts and lock in the reverse direction.

  Further, sheet material detection sensors for detecting the sheet material are arranged at the upstream position and the downstream position in the conveyance direction near the nip position between the separation roller 3 and the retard roller 4. In this sheet material detection sensor, the upstream side is a paper feed detection sensor 5a, and the downstream side is a rear end detection sensor 5b.

  A double feed detection sensor 6 for detecting double feed of the sheet material by ultrasonic waves is disposed at a downstream position in the conveyance direction near the nip position between the separation roller 3 and the retard roller 4.

  Further, a pressure spring 7 that presses the pickup roller 2 against the sheet material on the hopper 1 and a pressure sensor 8 as a pressure detection unit that detects the contact pressure of the pickup roller 2 are provided on the support shaft of the pickup roller 2. Is provided.

  Here, the hopper 1 is configured to be substantially parallel movable (up and down) in a vertical direction by a pressing mechanism such as a pantograph-like link (not shown) or a cam (not shown), and a sheet material is placed on the upper surface. It is a configuration that can be placed.

  The hopper 1 moves up and down in the vertical direction, and when the sheet material is fed, the hopper 1 is raised until the sheet material contacts the pickup roller 2 and presses the pickup roller 2 against the sheet material.

  The hopper 1 has a pressing force adjusting mechanism that stops when the contact pressure detected by the pressure sensor 8 reaches a predetermined pressure, and further raises the pressure until the pressure is set optimally for a thin sheet material having a predetermined thickness. Prepare.

  The pickup roller 2 rotates the sheet material when the sheet material rises to a position where the contact pressure becomes a set pressure, and feeds the sheet material.

  A rotatable roller (hereinafter referred to as “slip detection roller”) 9 is disposed coaxially with the pickup roller 2.

  The slip detection roller 9 rotates by being rotated with the sheet material fed out by the rotation of the pickup roller 2.

  The slip detection roller 9 is formed with a detection pattern (not shown) such as concavities and convexities for detecting rotation on the outer peripheral surface other than the portion in contact with the sheet material. The slip detection roller 9 detects the presence or absence of rotation by detecting this detection pattern with a sensor such as a photo interrupter. That is, when the sheet material in contact with the pickup roller 2 moves, the slip detection roller 9 that rotates with the sheet material rotates, so that the movement of the sheet material is detected.

  In the case of a thick sheet material, the pick-up roller 2 may slide and the sheet material may not move at a small contact pressure. In this case, the slip detection roller 9 does not rotate, so the sheet material and the pick-up roller 2 slip. Can be detected.

  Further, a jam detection roller 10 similar to the slip detection roller 9 is provided downstream in the conveyance direction of the slip detection roller 9. Similar to the slip detection roller 9, the jam detection roller 10 rotates with the sheet material and detects whether the sheet material is moving.

  Here, when the sheet material is fed by the pickup roller 2, it can be determined that the sheet material is normally conveyed if the jam detection roller 10 is rotating.

  On the other hand, when the sheet material is being fed by the pickup roller 2, it can be determined that a jam has occurred if the jam detection roller 10 is rotating at a speed slower than the feed speed or is stopped.

  In addition, the sheet material supply apparatus according to the present embodiment includes a start sensor 11 that detects a sheet material before the nip position of the conveying roller 20 provided after the separation roller 3 and the retard roller.

  Next, the operation of the sheet material supply apparatus having the above configuration will be described with reference to FIGS.

  FIG. 3 is a flowchart of the sheet material supply apparatus according to the embodiment of the present invention, and FIG. 4 is an operation explanatory diagram of the sheet material supply apparatus according to the embodiment of the present invention.

First, a sheet material is placed on the hopper 1 (S101), and the sheet material supply device is activated. It is assumed that bundles of sheet materials S ₁ and S _{2 having} various sizes and thicknesses within a specified range are set on the hopper 1 without being irregular.

However, the uneven amount of the leading ends of the sheet materials S ₁ and S ₂ (the distance between the leading edge of the most advanced sheet material and the leading edge of the last sheet material) is equal to or less than the distance between the pickup roller 2 and the separation roller 3. As a condition.

  Next, the hopper 1 is raised to a position where it comes into contact with the pickup roller 2 (S102), and the conveying roller 20 in the sheet material conveying path is rotated (S103).

  Next, the pickup roller 2 is rotated while the separation roller 3 and the retard roller 4 are stopped and held (S104), and it is determined whether the sheet material is moving by the slip detection roller 9 and the jam detection roller 10 (S105).

  Here, if it can be determined by the slip detection roller 9 that the sheet material is not slipping, and the jam detection roller 10 determines that the sheet material is not moving, it is determined that a jam has occurred, and the pickup roller 2 is stopped (S120).

  On the other hand, when the sheet material is moving, the pickup roller 2 continues to rotate until the leading edge of the sheet material reaches a registration position (a position nipped by the separation roller 3 and the retard roller 4) (see FIG. 4A). (S106).

  When the sheet material reaches the registration position, the pickup roller 2 continues to rotate by the rotation amount to be further fed by a predetermined amount (S107). Is the sheet material moved by the slip detection roller 9 and the jam detection roller 10 as in S105? It is determined whether or not (S108).

  If it is determined that the sheet material is not slipping by the slip detection roller 9 before the predetermined amount of feeding is completed, and if it is determined by the jam detection roller 10 that the sheet material is not moving, a jam has occurred. Determination is made to stop the pickup roller 2 (S120), and the pickup roller 2 is stopped (S109) assuming that the registration is completed when the predetermined amount has been fed.

As a result, as shown in FIGS. 4B and 4C, the sheet material S ₂ which is inclined and the leading edge of the uppermost sheet material S ₁ whose leading edge is displaced are moved by the separation roller 3 and the retard roller 4. Nipped.

  At this time, in the flow from S104 to S107, the contact pressure necessary to resist the static friction until the sheet material starts moving is set as the first set pressure when the sheet material is fed out normally. To do.

  However, once the sheet material starts to move, the static friction between the sheet materials or between the sheet material and the hopper becomes dynamic friction. Therefore, after the sheet material starts to move, the sheet material can be fed by lowering the contact pressure suitable for dynamic friction as the second set pressure and continuing the feeding.

  As a result, when the sheet material comes into contact with the nip position, unnecessary pressure is prevented from being applied to the sheet material, and smoother tip alignment can be achieved.

  Here, the pickup roller 2 is stopped, and the separation roller 3 is rotated (see FIG. 4D) (S110).

Thereby, the uppermost sheet material S ₁ is conveyed by the separation roller 3.

  Here, it is determined whether or not the sheet material is moved by the slip detection roller 9 and the jam detection roller 10 (S111), it can be determined that the sheet material is not slipping by the slip detection roller 9, and the jam detection roller 10 If it can be determined that the sheet material is not moving, it is determined that a jam has occurred and the pickup roller 2 is stopped (S121).

  Then, it is determined by the start end sensor 11 whether or not the sheet material has reached the conveying roller 20 (S112). When the sheet material has reached, the separation roller 3 is stopped (S113).

  When the trailing edge sensor 5b detects whether or not the sheet material has been conveyed by the conveying roller 20 and has passed the separation roller 3 (S114), a predetermined time interval is left (S115), and the sheet is placed at the registration position. It is determined whether there is a material (S116). If there is a sheet material, the process returns to S110 and repeats until there is no sheet material at the resist position.

  If there is no sheet material at the registration position, it is determined whether or not there is a sheet material on the hopper 1 (S117). If there is, the process returns to S104, and if not, the process ends (S118).

  Next, FIG. 5 is a longitudinal sectional view for explaining the operation when the conveyance blocking mechanism is provided in the sheet material supply apparatus in the present embodiment. FIG. 6 is a diagram illustrating the conveyance blocking mechanism in the sheet material supply apparatus in the present embodiment. It is a top view at the time of arrange | positioning.

As shown in FIGS. 5 and 6, the sheet material supply apparatus in the present embodiment further has a nip position between the separation roller 3 and the retard roller 4 and a position in the feeding direction of the sheet material S _{1 in} the vicinity of the same position. in the width direction of the conveying path of the sheet material S _1, it comprises a transport blocking mechanism 21 to prevent the conveyance of the sheet S ₁ fed from the pickup roller 2.

  As shown in FIGS. 5A and 5B, the conveyance blocking mechanism 21 is configured by a member that swings so as to open and close the conveyance path.

With such a conveyance blocking mechanism 21, in the sheet material supply device in the present embodiment, when the sheet material S ₁ set in the hopper is inclined, the conveyance blocking mechanism 21 closes the conveyance path, and the sheet material The leading edge of S ₁ is blocked by the conveyance blocking mechanism 21 and is correctly aligned with the nip position between the separation roller 3 and the retard roller 4.

When the sheet material S ₁ aligned at the nip position between the separation roller 3 and the retard roller 4 is conveyed further downstream by driving the separation roller 3, the conveyance prevention mechanism 21 opens the conveyance path, thereby smoothly The sheet material S ₁ can be conveyed.

As described above, in the sheet material supply apparatus according to the present embodiment, the pickup roller 2 feeds out the sheet material in a state where the separation roller 3 and the retard roller 4 are stopped and held, and the fed out sheet material is separated into the separation roller 3 and the retard. By being nipped by the roller 4 and driven until the movement stops, even if the sheet materials S ₁ and S ₂ on the hopper 1 are not aligned, they are aligned at the nip position by the separation roller 3 and the retard roller 4.

Then, when the separation roller 3 is driven after the pickup roller 2 is stopped, the separation roller 3 is sequentially supplied one by _one from the uppermost sheet material S1, thereby preventing double feeding.

Further, in the sheet material feeding apparatus of this embodiment, the separation roller 3, since the stopped when the sheet is nipped in the next stage of the conveying roller 20, conveying the sheet S ₁ of the uppermost stage of the next roller after being nipped 20, the sheet material S ₁ of the uppermost is conveyed by the conveying rollers 20.

Therefore, after the uppermost sheet material S ₁ has passed, the second and subsequent sheet materials S ₂ are not conveyed by the separation roller 20 and are prevented from being fed together with the uppermost sheet material S _1. be able to.

  INDUSTRIAL APPLICABILITY The present invention is useful as a control method for a sheet material supply apparatus and a sheet material supply apparatus for continuously supplying a sheet material into an apparatus body such as an image forming apparatus or an image reading apparatus.

  In particular, the present invention is suitable as a control method for a sheet material supply apparatus and a sheet material supply apparatus capable of supplying sheets one by one from the uppermost sheet material even if the sheet materials on the hopper are uneven.

The top view which shows schematic structure of the sheet material supply apparatus in embodiment of this invention 1 is a longitudinal sectional view of FIG. Flow chart of sheet material supply apparatus in the present embodiment Operation explanatory diagram of the sheet material supply apparatus in the present embodiment Longitudinal sectional view for explaining the operation when a conveyance blocking mechanism is provided in the sheet material supply apparatus in the present embodiment A plan view when a conveyance blocking mechanism is provided in the sheet material supply apparatus in the present embodiment A longitudinal sectional view showing a schematic configuration of a conventional sheet material supply apparatus Operation explanatory diagram of a conventional sheet material supply device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hopper 2 Pickup roller 3 Separation roller 4 Retard roller 5a Feed detection sensor 5b Separation detection sensor 6 Double feed detection sensor 7 Pressure spring 8 Pressure sensor 9 Slip detection roller 10 Jam detection roller 11 Start sensor 20 Conveyance roller 21 Conveyance prevention mechanism S ₁ and S ₂ sheet materials

Claims (12)

A liftable hopper on which sheet material is loaded;
A pickup roller for feeding out the sheet material on the hopper;
A separation roller for conveying the sheet material fed by the pickup roller in the feeding direction;
A control method of a sheet material supply apparatus having a retard roller that is brought into pressure contact with the separation roller with a predetermined load with an idling load and imparts a rolling effect to the sheet material,
The pick-up roller is driven until the sheet material is fed out while the separation roller and the retard roller are stopped and held until the fed sheet material comes into contact with the nip position between the separation roller and the retard roller and the movement stops. thing,
A control method for a sheet material supply apparatus, comprising: driving the separation roller after the pickup roller is stopped. The method of controlling a sheet material supply apparatus according to claim 1, further comprising stopping the separation roller when the sheet material is nipped by a next-stage conveyance roller. 3. The sheet material supply device according to claim 2, wherein the stopped separation roller is repeatedly driven until there is no sheet material nipped by the separation roller and the retard roller after the sheet material is conveyed by the conveyance roller. Control method. When there is no sheet material nipped by the separation roller and the retard roller, the pickup roller feeds the sheet material in a state where the separation roller and the retard roller are stopped and held, and the fed sheet material is the separation roller. 4. The method for controlling a sheet material supply apparatus according to claim 3, further comprising: driving until the movement stops by contacting a nip position with the retard roller. A liftable hopper on which sheet material is loaded;
A pickup roller for feeding out the sheet material on the hopper;
A separation roller for conveying the sheet material fed by the pickup roller in the feeding direction;
The separation roller is brought into pressure contact with a predetermined pressure with an idling load, and includes a retard roller that imparts a rolling effect to the sheet material,
The pickup roller feeds the sheet material in a state where the separation roller and the retard roller are stopped and held, and is driven until the movement of the fed sheet material stops,
The sheet supply device, wherein the separation roller is driven after the pickup roller is stopped. The sheet material supply apparatus according to claim 5, further comprising a sensor that detects a movement of the sheet material fed by the pickup roller. The sheet material supply apparatus according to claim 5, further comprising a sensor that detects the sheet material before a nip position between the separation roller and the retard roller. The sheet material supply apparatus according to claim 7, further comprising a sensor that detects passage of the sheet material at a subsequent stage of a nip position between the separation roller and the retard roller. A conveyance roller provided at a subsequent stage of the separation roller and the retard roller;
The sheet material supply apparatus according to claim 5, further comprising a sensor that detects the sheet material before the nip position of the conveying roller. The nip position of the separation roller and the retard roller and the position in the feeding direction of the sheet material are in the vicinity of the same position, and the conveyance of the sheet material fed from the pickup roller is prevented in the width direction of the conveyance path of the sheet material. The sheet material supply apparatus according to claim 5, further comprising a conveyance blocking mechanism. The sheet material supply device according to claim 10, wherein the conveyance blocking mechanism opens and closes the conveyance path. The pickup roller includes a pressure detection unit that detects a pressure that contacts the sheet material, and a pressing force adjustment mechanism that adjusts the pressure detected by the pressure detection unit to be a predetermined pressure. Item 12. The sheet material supply apparatus according to any one of Items 5 to 11.

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