JPH0543073A - Sheet feeder - Google Patents

Abstract

PURPOSE:To stablilize paper feeding by improving separation performance with a retard roller and broadening the latitude of a paper feeding condition for transcription paper, in a feeding apparatus provided with a pickup roller, a feed roller, and a retard roller. CONSTITUTION:This sheet feeder is provided with a detection means 27 detecting one or the plural number of transcription sheets 2 fed with a pickup roller 5, a reversal roller 29, a driven roller 30, and a control means 31 advancing/retreating the reversal roller 29 in/from a sheet passing region 10 based on the results of the detection means 27. When the transcription sheets 2 fed through the sheet passing region 10 are plural, the reversal roller 29 enters the sheet passing region 10 to separate one of the plural transcription sheets 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet material supplying device for supplying a sheet material to an apparatus main body, and more specifically, a sheet suitable for supplying a transfer sheet as a sheet material into the image forming apparatus main body. Material supply device.

[0002]

2. Description of the Related Art FIG. 9 shows a conventional sheet material feeding device 1. The sheet material feeding device 1 feeds the transfer paper 2 to an image forming apparatus (not shown) (arranged on the left side of the paper surface in FIG. 9). As shown in FIG. 9, the sheet material feeding device 1
Is a pickup roller 5 that feeds the uppermost transfer papers 2 one by one from a sheet material storage device 3 in which a plurality of transfer papers 2 are stacked and stored on a stacking table (not shown). A feed roller 6 that conveys the transfer paper 2 fed from the sheet material storage device 3 into the main body of the image forming apparatus (not shown) (in the direction of the arrow b in the figure), and the sheet material storage device 3 that is arranged to face the feed roller 6. When there are a plurality of transfer sheets 2 fed, one sheet of transfer sheet 2 is rotated by rotating the pickup roller 5 in the direction opposite to the rotation direction.
It includes a retard roller 7 for separating and a pair of conveyance rollers 9 arranged in front of the main body of the image forming apparatus.

A guide 11 is arranged in a sheet material passing region 10 between the pickup roller 5, the feed roller 6 and the retard roller 7, and between the feed roller 6 and the retard roller 7 and the conveying roller pair 9, and A guide 12 is arranged between the pair of conveying rollers 9 and the main body of the image forming apparatus, and the transfer paper 2 is guided and conveyed.

The feed roller 6 and the retard roller 7 are driven by the drive transmission device 13 shown in FIG. As shown in FIG. 10, the drive transmission device 13 includes a feed roller shaft 15 for supporting the feed roller 5, a retard roller shaft 16 for supporting the retard roller 6, and a retard roller connected to the retard roller shaft 16. The drive shaft 17 is provided substantially in parallel.

Further, a coupling 19 and a torque limiter 20 are arranged between the retard roller shaft 16 and the retard roller drive shaft 17. Further, an electromagnetic clutch 22 is provided at the end of the feed roller shaft 15 for transmitting to the feed roller shaft 15 the driving force transmitted from the main driving means (not shown) of the main body of the image forming apparatus via the drive input belt 21. There is. Further, between the feed roller shaft 15 and the retard roller drive shaft 17, the rotational driving force transmitted to the feed roller shaft 9 is applied to the retard roller drive shaft 1.
The retard drive belt 23, which transmits to 7, is wound around.

The driving of the feed roller 6 and the retard roller 7 by the drive transmission device 13 will be described.

The rotational driving force given from the main driving means of the image forming apparatus main body (not shown) is applied to the driving input belt 21.
And is input to a pulley 25 provided in the armature portion of the electromagnetic clutch 22 which is ON / OFF controlled according to the sheet feeding timing.

Since the feed roller shaft 15, which rotates integrally with the rotor portion of the electromagnetic clutch 22, the retard roller drive shaft 17, and the retard roller shaft 16 are connected by the retard drive belt 23, the feed roller shaft 15 and the retard roller are connected to each other. The roller shaft 16 and the retard roller drive shaft 17 rotate in the same direction, and the feed roller 6 and the retard roller 7 are rotationally driven in synchronization with the feeding timing being ON.

By the drive transmission device 13, the transfer paper 2 is fed in the paper feeding direction (direction of arrow b shown in FIGS. 9, 10 and 12).
When the sheet is fed one by one to the retard roller 7, the torque limiter 20 idles due to the frictional force between the retard roller 7 and the transfer sheet 2, and the retard roller 7 rotates in the same direction as the rotation direction of the retard roller drive shaft 17.

When a plurality of transfer papers 2 are fed, the frictional force between the plurality of transfer papers 2 is smaller than the frictional force between the retard roller 7 and the transfer paper 2. The torque limiter 20 does not idle, and the retard roller 7 rotates in the direction opposite to the rotational drive direction of the retard roller drive shaft 17.

As a result, the transfer paper 2 on the feed roller 6 side, that is, the uppermost transfer paper 2 and the other transfer papers 2 among the plurality of transfer papers 2 are separated from each other, and the transfer paper 2 into the image forming apparatus main body is separated. It is designed to prevent double feeding of paper.

Hereinafter, a phenomenon in which a plurality of transfer sheets 2 are sent from the sheet material storage device 3 to the retard roller 7 will be referred to as "bundle conveyance", in which a plurality of transfer sheets 2 cannot be separated by the retard roller 7 into the main body of the image forming apparatus. The phenomenon in which the transfer paper 2 is fed is referred to as “double feeding”.

Next, a theoretical formula for preventing the double feeding of the transfer paper 2 by the sheet material feeding device 1 having the above-mentioned structure will be described.

N> T / rμRP + μPPW / μRP (1) N <T / rμPP- (n-1) W (2) where μRP: coefficient of friction between retard roller and transfer paper μPP: Friction coefficient between transfer sheets N: Pressure of retard roller W: Pressure of pickup roller T: Torque limiter idling torque r: Radius of retard roller n: Number of transfer sheets sent to retard roller nip part ).

The relationship between the above equations (1) and (2) can be obtained by applying the pressing force N of the retard roller 7 and the idling torque T of the torque limiter 21.
FIG. 11 shows a graph in which is used as a parameter.
In the figure, the shaded area is the feeding area. That is, in order to enlarge the shaded area, it is necessary to increase the friction coefficient μRP between the retard roller 7 and the transfer paper 2 or decrease the pressing force W of the pickup roller 5.

[0016]

However, the conventional sheet material feeding device 1 has the following problems.

Among the transfer papers 2 that are usually used, even if the same kind is used, the coefficient of friction between the papers varies,
Further, depending on the user, there are many cases in which different types of transfer papers are separately loaded on the loading table of the sheet material storage device 3. In such a case, the coefficient of friction between the transfer paper 2a in the plurality of transfer papers 2 stacked in the sheet material storage device 3 and the transfer paper 2b immediately below the transfer paper 2a (see FIG. 12) is around the transfer paper 2a. If the friction coefficient is significantly smaller than the coefficient of friction between them, bundle conveyance as shown in FIG. 12 occurs (in FIG. 12, three transfer sheets 2 are bundled).

In this case, the bundle of transfer sheets 2 is conveyed to the nip portion between the feed roller 6 and the retard roller 7 and is conveyed into the main body of the image forming apparatus while being separated.

However, as shown in FIG. 11, when the transfer sheet (usually about 5 to 10 sheets) 2 conveyed in a bundle is pushed into the nip portion of the feed roller 6 and the retard roller 7, the sheet feeding operation is performed. The sheet feeding state in which the number n of bundles conveyed in the y-intercept (-nW) of the straight line A is large and the straight line A shown in FIG. 11 is offset to the straight line B shown by the dotted line, the feeding area (mesh portion) becomes small.

That is, there is a problem that the sheet feeding in the bundle conveying is in an unstable state in which both slip and double feeding are likely to occur.

To solve the above problem, the feed roller 6 is conventionally used.
In addition, the separation performance of the retard roller 7 is improved by using a material having a high friction coefficient μRP for the retard roller 7 and decreasing the pressing force W of the pickup roller 5 at the intercept (−nW) of the straight line A shown in FIG. Alternatively, a baffle plate or an air separation system is used as a pre-discriminating means for the stacked transfer papers 2 in order to prevent bundle conveyance.

However, in all cases, there are many points that are inadequate when the restrictions on the physical properties of the material, the stability of transport of various types of transfer paper, and the cost are all taken into consideration.

Therefore, it is an object of the present invention to improve the separation performance by the retard roller, widen the latitude of the feeding condition of the transfer paper, and stabilize the paper feeding.

[0024]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and a sheet material storage device (3) in which a plurality of sheet materials (2) are stacked and stored is used. A pickup roller (5) for feeding the sheet material, a feed roller (6) for conveying the sheet material (2) fed from the sheet material storage device (3) to the apparatus main body by the pickup roller (5), When there are a plurality of sheet materials fed from the sheet material storage device (3) facing the feed roller (6), they rotate in the direction opposite to the rotation direction of the pickup roller (5) to In a sheet material feeding device comprising a retard roller (7) for separating into sheet materials, a sheet material passing region (10) between the pickup roller (5) and the feed roller (6) is provided. Then, a detection means (27) for detecting whether the sheet material (2) fed by the pickup roller (5) is one sheet or a plurality of sheets, and a sheet material passing region (10) are arranged so as to be able to move back and forth. And a reverse rotation roller (29) that rotates in a direction opposite to the sheet material feeding direction, and a reverse rotation roller (2) that is disposed opposite to the reverse rotation roller (29).
The driven roller (30) supporting the sheet material (2) in the sheet material passage area (10) pressurized by 9) and the detection means (27) are fed by the pickup roller (5). The reversing roller (29) is retracted from the sheet material passage area (10) based on the result of detecting that the number of the sheet material (2) is one, and the detecting means (27) causes the pickup roller (5). On the basis of the result of detecting that the sheet material (2) fed by the plurality of sheet materials (2), the reverse rotation roller (29) is advanced into the sheet material passage area (10) to form a plurality of sheet materials (2). And a control means (31) for bringing them into contact with each other.

[0025]

According to the above construction, the sheet material 2 is fed from the sheet material storage device (3) by the pickup roller 5 and conveyed between the feed roller (6) and the retard roller (7) for separation. Then, only one sheet is fed into the apparatus main body.

At this time, the detection means 27 detects whether the sheet material fed to the sheet material passage area (10) is one sheet or a plurality of sheets. Based on the result of the detection means 27, the control means (31) sets the reverse rotation roller to the sheet material passing region (1
Move to 0).

When the number of sheet materials (2) fed to the sheet material passing area (10) is one, the control means (31) retracts the reverse rotation roller (29) from the sheet material passing area (10). .. When the sheet material (2) fed to the sheet material passage area (10) is a plurality of sheets (for bundle conveyance), the control means (31) causes the reverse roller (29) to move the sheet material passage area (10). ), Contact the upper or lower part of the plurality of sheet materials, and rotate the reverse rotation roller (29) in the direction opposite to the rotation direction of the pickup roller (5) to remove the plurality of sheet materials (2). Separate one of them.

The reference numerals in parentheses refer to the drawings, but do not limit the structure of the present invention.

[0029]

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

The same components as those of the conventional sheet material feeding device 1 shown in FIG. 9 are designated by the same reference numerals in the drawing, and the duplicated description will be omitted. <First Embodiment> FIG. 1 shows a sheet material feeder 26 of the first embodiment. In the figure, the sheet material feeding device 26 of the present embodiment is arranged in the sheet material passing region 10 between the pickup roller 5 and the feed roller 6 and the transfer sheet 2 fed by the pickup roller 5 is one sheet. Detecting means 27 for detecting a plurality of sheets and sheet material passing region 10
A reverse rotation roller 29 which is arranged so as to move forward and backward and rotates in a direction opposite to the rotation direction of the pickup roller 5, and a driven roller which is arranged opposite to the reverse rotation roller 29 and supports the sheet material 2 pressed by the reverse rotation roller 29. 30 and 30.

Further, in the sheet material feeding device 26 of this embodiment, the sheet material 2 fed by the pickup roller 5 is used.
When the detection means 27 detects that the number of sheets is one, the reverse rotation roller 29 is retracted from the sheet material passage area 10 based on the detection result, and it is also detected that the sheet material 2 fed by the pickup roller 5 is a plurality of sheets. A control means 31 is provided which, when detected by the means 27, causes the reverse rotation roller 29 to enter the sheet material passing region 10 and contact the plurality of sheet materials 2 based on the result.

As shown in FIGS. 1 and 4, the detection means 27 has a sensor 32 such as a photocoupler, one end of which enters the sheet material passing region 10 and the other end of which is positioned on the detection surface 33 of the sensor 32 and which is a spindle. Sensor flag 36 that can be rotated by 35
The output of the sensor 30 is output to the control means 31.

When the transfer paper 2 enters the sheet material passing region 10, one end of the sensor flag 36 abuts on the transfer paper 2 and rotates, and the other end crosses the detection surface 33, whereby the sensor 3 is detected.
2 outputs an ON signal to the control means, and when passage of the transfer paper 2 is completed, the sensor flag 36 reversely rotates and the other end retracts from the detection surface 30a, whereby the sensor 32 outputs an OFF signal to the control means 31.

The output signal from the sensor 32 will be described with reference to FIG. In FIG. 2, a timing chart A is a signal output by the sensor 32 when the transfer paper 2 passes through the sheet material passage area 10 one by one from the start of operation of the image forming apparatus (not shown), that is, the copy start t0, and is constant. The ON / OFF signal is output in the cycle (Δt).

On the other hand, the timing chart B shows the case where a plurality of transfer papers 2 pass through the sheet material passing region 10, and in this case, the sensor 32 continues to output the ON signal to the control means 31. That is, the transfer paper 2 is separated one after another by the retard roller 7 and remains in the sheet material passing region 10. When a plurality of transfer sheets 2 are conveyed to the sheet material passing area 10, when there are n transfer sheets 2, t
The sensor outputs an ON signal to the control means 31 by n + Δt−t.

The time between the ON output of the sensor 31 and the ON output (hereinafter referred to as "paper interval time") is t1 ', t.
2 ', t3' ... And the sequence for identifying the output signal from the sensor at this paper interval time is set in the flowchart shown in FIG.

The reversing roller 29 is adapted to move in and out of the sheet material passing region 10 by the elevating means 37 arranged below the sheet material passing region 10. As shown in FIGS. 1 and 4, the lifting means 37 includes a lifting support shaft 39.
And a rotating shaft 5 of the motor 57 that abuts on one end of the lifting link 50 and is supported by the rotating shaft 5 of the motor 57.
6, an elevating cam 51 fixed to 6 and an elevating link 50 at one end.
The pressure spring 5 that is fastened to the multi-ends of the two and is fastened to the frame 52 to urge the up-and-down link 50 toward the up-and-down cam 51.
3 and 3.

The reverse rotation roller 29 is rotatably supported by the elevating link 50, and the reverse rotation roller driving belt 55 is wound around the elevating support shaft 39. The rotation driving force of the motor 68 is transmitted to the lifting support shaft 39, and this rotation driving force is transmitted via the reverse rotation roller driving belt 55. These motors 57 and 68 are connected to the control means 31, and their drive is controlled respectively.

When the elevating cam 51 contacts the elevating link 50 at the outer periphery where the distance to the rotating shaft 56 is the longest, that is, at the top dead center, the elevating link 50 rotates in the clockwise direction in FIG. , The reverse roller 29 to the sheet material passing region 1
The pressure on the driven roller 30 is released by retracting from 0. When the elevating cam 51 comes into contact with the elevating link 50 at the outer periphery where the distance to the rotating shaft is the shortest, that is, at bottom dead center, the elevating link 50 rotates counterclockwise in FIG. The roller 29 is moved into the sheet material passing region 10 to press the driven roller 30.

Next, a method of feeding the transfer paper 2 to the main body of the image forming apparatus will be described with reference to FIGS. 3 and 4. In FIG. 2, t1, t2, ... Tn are times determined by the sheet feeding speed and the distance between sheets.

When the image forming apparatus operates to start copying (S1), the pickup roller 5 in FIG.
The feed roller 6 rotates counterclockwise (direction of arrow a in the drawing), and the retard roller 7 rotates clockwise (direction of arrow c in FIG. 1) in FIG. 1 because the torque limiter 20 idles due to friction with the feed roller 6. Further reverse roller 29
Rotates in the direction opposite to the rotation direction of the pickup roller 5, that is, in the clockwise direction in FIG.

From this state, the uppermost transfer sheets 2 stacked in the sheet material storage device 3 are fed to the sheet material passage area 10 by the pickup roller 5. At this time, when one sheet of the transfer paper 2 is fed, the retard roller 7 is driven by the frictional force between the feed roller 6 and the transfer paper 2 and the idling of the torque limiter 20 to cause the retard roller drive shaft 17 to rotate in the rotational direction. Rotates in the opposite direction to.

Then, the sensor 32 of the detecting means 27 detects whether or not the transfer paper 2 has passed through the sheet material passing region 10, and in this case, the ON / OFF signal is output in a constant cycle to determine the paper interval time. Is turned off (S2). Based on this signal, the control means 31 drives the motor 57 to bring the elevating cam 51 into contact with the elevating link 36 at the outer periphery having the longest distance from the rotating shaft 56 to the outer periphery, and to cause the reverse roller 27 to pass the sheet material passing region. It is retracted from 10, and the pressure applied to the driven roller 29 is released (S3).

When a plurality of transfer papers 2 are fed, that is, when they are conveyed in a bundle, the frictional force between the plurality of transfer papers 2 is increased by the frictional force between the retard roller 7 and the transfer papers 2. Since the force is small, the torque limiter 20 does not idle, and the retard roller 7 rotates in the same direction as the rotational drive direction of the retard roller drive shaft 17. As a result, the uppermost transfer paper 2 among the plurality of transfer papers 2 and the other transfer papers 2 are transferred.
Are separated from each other, and the double feeding of the transfer paper 2 into the main body of the image forming apparatus is prevented.

At this time, the sensor 32 of the detecting means 27 detects whether or not the transfer sheet 2 has passed through the sheet material passage area 10. In this case, only the ON signal is output and the sheet interval time is turned ON ( S2). Control means 31 based on this signal
Drives the motor 57 to move the lifting cam 51 to the rotary shaft 56.
The shortest distance from the outer circumference to the outer circumference is brought into contact with the elevating link 50 to cause the reverse rotation roller 29 to enter the sheet material passing region 10 and press the driven roller 30. The reversing roller 29 that has entered the sheet material passing region 10 contacts the transfer sheet 2 that has been conveyed in a bundle, rotates in the direction opposite to the rotation direction of the pickup roller 5 and separates, and transfers between the feed roller 6 and the retard roller 7. Prevents the entry of multiple sheets of material.
As a result, the separation performance of separating the transfer sheets 2 conveyed in a bundle by the retard roller 7 can be improved.

As described above, according to this embodiment, the transfer paper 2
Even if the coefficient of friction between the sheets varies, or even if different types of transfer papers 2 are stacked differently on the sheet material storage device 3 by the user, the plurality of transfer papers 2 can be reliably separated.

Further, since it is not necessary to use the material of the retard roller 7 having a high friction coefficient, the cost does not increase. Further, it is not necessary to reduce the pressure applied to the pickup roller 5 and it is not necessary to provide a baffle plate.

It is desirable that the peripheral speed of the reverse rotation roller 29 is variably set according to the length of the paper path and the number of transfer sheets 2 conveyed in a bundle, without being fixed at the same speed as the paper feeding speed. <Second Embodiment> Next, a sheet material feeding device 59 of the second embodiment.
This will be described with reference to FIGS. The same components as those of the conventional sheet material feeding device 1 and the sheet material feeding device 26 of the first embodiment are designated by the same reference numerals in the drawings, and duplicated description will be omitted.

As shown in FIG. 5, in the sheet material feeding device 57 of this embodiment, the eccentric roller 6 is provided below the sheet material passage area 10.
0 and a driven roller 61 provided above the eccentric roller 60.

As shown in FIG. 6, two sets of eccentric rollers 60 are arranged at the center of the eccentric roller shaft 63. Eccentric cams 63 are supported on both sides of the eccentric roller shaft 63, respectively. Also, the top dead center phase of the eccentric cam 63 and the eccentric roller 60
It coincides with the bottom dead center phase.

The driven roller 61 has a driven roller shaft 65.
Is arranged in the central portion of and corresponding to the eccentric roller 60. At both ends of the driven roller shaft 65, driven rollers 66 abutted against the eccentric cam 63 by urging means not shown are respectively supported.

When the bottom dead center of the eccentric roller 60 is located in the sheet material passing region 10, the driven roller 61 is in the state of being lifted to the uppermost position by the eccentric cam 63 (hereinafter, this state is referred to as "released state"). Called)).

Further, when the top dead center of the eccentric roller is located in the sheet material passing region 10, the driven roller 61 moves to the lowermost part, and when the eccentric roller 61 is in contact with the driven roller 61, the driven roller 6 is moved.
By providing a gap between 6 and the eccentric cam 63,
In FIG. 6, by the biasing force that biases the driven roller 66,
The eccentric roller 60 and the driven roller 61 are pressed (hereinafter, this state is referred to as "pressurized state").

The eccentric roller 60 has a motor 69.
When the rotation driving force of the pickup roller 5 is transmitted through the drive transmission belt 71 and is rotated in the direction opposite to the rotation direction of the pickup roller 5, and the rotation is stopped, it is in the released state.

Further, the driving means (not shown) and the detection means 27 are connected to the control means 67. Control means 6
Reference numeral 7 drives and controls a drive unit (not shown) based on the detection result of the detection unit 27.

Next, the operation of the control means 67 will be described with reference to the flowchart of FIG.

When the image forming apparatus is operated and copying is started (S1), the uppermost transfer sheet 2 is fed from the sheet material container 3 to the sheet material passage area 10 by the pickup roller 5. In this feeding, when the number of transfer sheets 2 is one, the detecting unit 27 turns off the sheet interval time (S
2) Based on this result, the control means 67 stops the drive means and brings the eccentric roller into the released state (S3).

When a plurality of sheets of transfer paper 2 are fed into the sheet material passing area 10, the detecting means 27 turns on the paper interval time (S2), and the control means 6 is based on this result.
The driving means 7 drives the driving means to pressurize the eccentric roller 60 so that the eccentric roller 60 comes into contact with the lower portions of the plurality of transfer papers 2 (S3).

As a result, the plurality of transfer sheets 2 are separated by the eccentric roller which rotates in the direction opposite to the rotation direction of the pickup roller 5, and the bundle conveyance between the feed roller 6 and the retard roller 7 is prevented. be able to.

In each of the above embodiments, the transfer paper 2 as a sheet material is fed to the image forming apparatus. However, according to the sheet material supply device of the present invention, an OHP sheet or the like other than the transfer paper is used. It can also be used for supply.

Further, the detecting means 27 may be a detecting means other than the above structure. Further, the reverse rotation roller is set to the sheet material passing region 10
The elevating means 37 for advancing and retreating may be other than the above configuration.

[0062]

As described above, according to the present invention,
When there are a plurality of sheet materials fed from the sheet material storage device by the pickup roller, the reverse rotation roller is advanced into the sheet material passage area 10 to separate the sheet material, so that the separation performance by the retard roller is improved. The excellent effect that the latitude of the sheet material feeding condition can be widened to stabilize the feeding can be obtained.

[Brief description of drawings]

FIG. 1 is a side view showing a first embodiment of a sheet material feeding device according to the present invention.

FIG. 2 is a timing chart showing the output of the sensor.

FIG. 3 is a flowchart showing the operation of the sheet material feeding device of the first embodiment.

FIG. 4 is a side view showing a state when a bundle of sheet materials is conveyed in the sheet material supply device according to the first embodiment.

FIG. 5 is a side view showing a second embodiment of the sheet material feeding device according to the present invention.

FIG. 6 is a perspective view showing driving of an eccentric roller according to a second embodiment.

FIG. 7 is a flowchart showing the operation of the sheet material feeding device of the second embodiment.

FIG. 8 is a side view showing a state in which a sheet material bundle is conveyed in the sheet material supply device according to the second embodiment.

FIG. 9 is a side view showing a conventional sheet material feeding device.

FIG. 10 is a perspective view showing a drive transmission device.

FIG. 11 is a diagram showing a theoretical formula of a retard roller.

FIG. 12 is a side view showing a state when a bundle of sheet materials is being conveyed.

[Explanation of symbols]

 2 sheet material (transfer sheet) 3 sheet material storage device 5 pickup roller 6 feed roller 7 retard roller 10 sheet material passage area 26, 59 sheet material supply device 27 detection means 29 reverse rotation roller 30 driven roller 31, 67 control means 32 sensor 37 Lifting means 60 Eccentric roller 61 Driven roller

Claims (2)

[Claims] 1. A pickup roller for feeding a sheet material from a sheet material storage device in which a plurality of sheet materials are stacked and stored, and a sheet material fed from the sheet material storage device by the pickup roller. If there are a plurality of sheets of sheet material fed from the sheet material accommodating device and the feed roller that conveys the sheet to the apparatus body, the sheet is rotated in the direction opposite to the rotation direction of the pickup roller and In a sheet material supply device including a retard roller for separating the sheet material into sheets, a sheet material fed by the pickup roller is arranged in a sheet material passage area between the pickup roller and the feed roller. Detecting means for detecting whether the sheet is a single sheet or a plurality of sheets; The reverse rotation roller that rotates in the opposite direction to the feeding direction, the driven roller that is arranged to face the reverse rotation roller and supports the sheet material in the sheet material passage area pressed by the reverse rotation roller, and the detection means. Based on the result of detecting that the number of the sheet material fed by the pickup roller is one, the reverse rotation roller is retracted from the sheet material passing area, and the detecting means detects the sheet material fed by the pickup roller. A sheet material supply device comprising: a control unit that causes the reverse rotation roller to enter the sheet material passage area and contact the plurality of sheet materials based on a result of detection that the sheet material is a plurality of sheets. 2. An eccentric roller, a part of the peripheral surface of which can move forward and backward in the sheet material passing region, and which rotates in a direction opposite to the sheet material feeding direction, and the sheet material in synchronization with the rotation of the eccentric roller. 2. The sheet material feeding device according to claim 1, further comprising a driven roller which is capable of advancing and retracting in a passage area and which is disposed on a side opposite to the eccentric roller.