JP2002220123A - Paper feeding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such problems that a descent width of a pick-up roller (pick- up arm) is small and a shutter cannot rise when the shutter is operated in the interlocking relationship with the pick-up arm at all times in its mechanism and many sheets of paper are inserted and the shutter also moves vertically in the interlocking relationship with vertical movement of the pick-up roller per feed of one document and the document is damaged during its conveyance. SOLUTION: An energizing member 20 energizing the shutter 21 so as to rise at all times is provided in such a way that the shutter 21 rises simultaneously when the pick-up roller 9 descends and the shutter 21 descends after rising beyond a predetermined height when the pick-up roller 9 rises. An engaging member 18 and an engaging piece 22 are fixed to the shutter 21 and the pick-up arms 7, 8, respectively, their engagement comes off when the pick-up roller 9 descends, and they are engaged when the pick-up roller 9 rises beyond a predetermined height.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feeder of an automatic document feeder used for a facsimile machine, a copying machine, and the like.

[0002]

2. Description of the Related Art Conventionally, in an automatic document feeder,
When a user inserts a document, a shutter is arranged at an intermediate position between the pickup roller and the sheet separating apparatus to prevent the sheet separating apparatus (separate roller and retard roller) from entering the sheet separating apparatus and perform stable sheet feeding. I have. The shutter is configured to be mechanically always linked to the pickup arm, and the shutter is moved up and down in conjunction with the swinging operation of the pickup arm. Further, in order to raise the shutter so as to be separated from the leading end of the document, the rotation fulcrum of the shutter is configured to be coaxial with the pickup roller.

[0003]

As described above, when the shutter is mechanically linked to the pickup arm at all times, the drop width of the pickup roller (pickup arm) is small when a large number of sheets are inserted, and the shutter is not moved. The problem of not rising sufficiently occurs. In addition, there is also a problem that the shutter moves up and down as the pickup roller moves up and down each time one document is fed, and the document is damaged during the document conveyance. Further, when the pivot point of the shutter is provided coaxially with the pickup roller as described above, the arm connecting the pivot point and the shutter body is shortened, and the pivot angle range required for raising and lowering the shutter is increased. . Therefore, in order to prevent the tip of the shutter from coming into contact with the pivot of the separate roller when the shutter is raised, it is necessary to secure a sufficient space from the pivot of the pickup roller to the pivot of the separate roller.
It was difficult to secure such a space.

[0004]

The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described. That is, in claim 1, a separate roller disposed on the drive shaft, a pickup arm rotatably provided around the drive shaft, a pickup roller rotatably provided at the tip of the pickup arm, A sheet feeder including a shutter positioned between the pickup roller and the separate roller and swingably provided from a regulation position for regulating the leading edge of the document, wherein the shutter is simultaneously raised when the pickup roller is lowered. In addition, when the pickup roller is raised, the shutter is lowered after rising above a predetermined height.

According to a second aspect of the present invention, there is provided an urging member for urging the shutter so as to always raise the shutter, and an engaging member is fixed to the shutter and the pickup arm, respectively. Disengage,
When the pickup roller rises above a predetermined height, the pickup roller is engaged.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An automatic document feeder (hereinafter, ADF) 1 equipped with a paper feeder 2 according to the present invention will be described with reference to FIGS. FIG. 1 is a side sectional view of the ADF device 1 showing a state where the shutter 21 is lowered, and FIG. 2 is a side sectional view of the ADF device 1 showing a state where the shutter 21 is raised. FIGS. 1 and 2 show an ADF device 1 provided in an image forming apparatus such as a facsimile machine or a copying machine. The ADF device 1 includes an upper sheet feeding device 2 and a lower conveying device 3. An inner guide 41 is provided on the upper surface of the transport device 3. The right side of the inner guide 41 (document insertion port 1 a into the ADF device 1) and a supply tray (not shown) connected to the inner guide 41 are provided. Document bundle 5
Can be placed. Then, the document bundle 5 placed on the inner guide 41 is separated and fed one by one by the sheet feeding device 2 so that the document 5 a is conveyed into the ADF device 1.

A document transport path is provided in the ADF device 1, and a document 5 sent through the document transport path by a document reading unit (not shown) disposed below the transport apparatus.
a is read in the middle of the document conveying path. The read original 5a is placed on the outer guide 45.
Is discharged to a discharge tray (not shown) connected to the right portion (document discharge port 1b to the ADF device 1). The document conveying path includes an outer guide 40 provided on a lower surface of the sheet feeding device 2,
Inner guides 41, 42, 43, and
44 and an outer guide 45 and the like. Then, in order to be able to transport the document 5a, the retard roller 33, the feed roller 34,
35 and 36 are arranged. These rollers are drive rollers, and the feed rollers 34, 35 and 36 are AD rollers.
The document 5a rotates in a direction for transporting the document 5a into the F apparatus 1 (hereinafter, document feeding direction). Further, the retard roller 33 is rotated in a direction to reversely feed the original 5a to the original insertion slot 1a. However, as will be described later, the original 5a Conveyed inside.

Next, the paper feeder 2 will be described.
The paper feeding device 2 includes a document feeding mechanism and a shutter mechanism. First, the document feeding mechanism will be described with reference to FIGS. FIG. 3 is a plan view of a main part of the sheet feeding device 2 showing a state where the shutter 21 is lowered. Drive shaft 4
The power of a motor (not shown) is transmitted through a gear or the like and driven. The drive shaft 4 is provided with a separate roller 6. The separation roller 6 feeds the original 5a by rotating the drive shaft 4 in the original feeding direction. Pickup arms 7.8 are rotatably provided on both sides of the separate roller 6 with the drive shaft 4 as a fulcrum, and a pickup roller 9 is rotatably provided at the tip of the pickup arms 7.8. I have. An urging member 10 formed of a spring or the like is interposed between the pickup arm 7 and the outer guide 40,
Pickup arm 7 (and pickup roller 9)
Is urged upward with the drive shaft 4 as a fulcrum.

The separate roller 6 is attached to the drive shaft 4 via a one-way clutch 11. The rotation of the drive shaft 4 causes the separate roller 6 to rotate in the document feeding direction, and causes the separate roller 6 to move in the same direction. When rotating in the original feeding direction, the idle rotation is performed. A gear 12 is coaxially fixed to the separate roller 6 so that the separate roller 6 and the gear 12 rotate integrally. A gear 13 is also coaxially fixed to the pickup roller 9 so that the pickup roller 9 and the gear 13 rotate integrally. A belt 14 is attached to the gears 12 and 13.
Is wound, so that the rotation of the drive shaft 4 is also transmitted to the pickup roller 9.

[0010] A torque limiter 15 is provided between the gear 13 and the pickup arm 7.
Is restricted in rotation by receiving a load torque from the torque limiter 15. The torque that exceeds the load torque (limit torque) limited by the torque limiter 15
, The gear 13 rotates with respect to the pickup arm 7. When the drive shaft 4 starts rotating, the torque is transmitted to the gear 13 as described above, and the gear 13 tries to rotate. However, the rotation of the gear 13 is limited by the load torque by the torque limiter 15. On the other hand, as described above, the pickup arm 7 is provided rotatably with respect to the drive shaft 4. Therefore, the rotational force of the drive shaft 4 is directed to the pickup arm 7 whose rotation is easier than the rotation of the gear 13. Therefore, the pickup arm 7 rotates downward about the drive shaft 4 as a fulcrum, and the gear 13
Is relatively fixed to the pickup arm 7 and does not rotate. As a result, the pickup roller 9 descends in accordance with the downward rotation of the pickup arm 7. When the descending pickup roller 9 comes in contact with the document bundle 5 as shown in FIG. 2, the pickup arm 7 cannot descend further.
As a result, all the rotational force of the drive shaft 4 is directed to the gear 13. In this case, the torque applied to the gear 13 from the drive shaft 4 exceeds the load torque limited by the torque limiter 15. Accordingly, the gear 13 rotates with respect to the pickup arm 7, and the pickup roller 9 rotates.

That is, when the drive shaft 4 rotates in the document feeding direction, the one-way clutch 11 is engaged, and the rotational force of the drive shaft 4 is transmitted to the separate roller 6 and the gear 12, and as a result, the pickup Roller 9 is bundled with original 5
The pickup arm 7 is moved down until it comes into contact with. When the pickup roller 9 comes into contact with the original bundle 5,
A torque equal to or greater than the limit torque is applied to the gear 13 to rotate the pickup roller 9, and the original 5 a positioned at the top of the original bundle 5 is fed into the ADF device 1.

When the drive shaft 4 rotates in the reverse direction with respect to the document feeding direction, the engagement of the one-way clutch 11 is released, and the transmission of power to the separate roller 6 and the gear 12 is cut off. Therefore, no rotational force is transmitted to the pickup arm 7, and the pickup arm 7 rotates upward by the urging force of the urging member 10. As will be described later, the drive shaft 4 rotates in the reverse direction when all the original bundles 5 are fed into the ADF apparatus 1 and there is no original in the inner guide 41.

As shown in FIG. 2, the pickup roller 9
The document 5a fed into the ADF apparatus 1 by the above is first conveyed between the separate roller 6 and the retard roller 33. Separate roller 6 and retard roller 33
And a sheet separating apparatus, and the sheet separating apparatus feeds the originals 5a conveyed from the pickup roller 9 side by sheet to the sheet conveying path as described below. . When the document 5a is transported, the separate roller 6 rotates in the document feeding direction.
The retard roller 33 rotates in the opposite direction as described above. The retard roller 33 is provided on a drive shaft of the roller via a torque limiter, and is rotatable with respect to the drive shaft when a predetermined torque or more is applied. Separate roller 6 is retard roller 3
If the original is pressed between the rollers and the original is not sandwiched between the rollers,
Alternatively, when only one document 5a is sandwiched, the retard roller 33 rotates with the separation roller 6 in the document feeding direction. This is because when the rotation torque of the separate roller 6 is applied to the retard roller 33,
This is because the torque limiter is released.

Each of the separate roller 6 and the retard roller 33 is provided with a member having a large friction coefficient such as rubber on the outer periphery. Then, from the frictional force acting between the originals 5a, 5a,
The frictional force acting between the rollers and the document 5a is made larger. Therefore, a plurality of originals 5a
Are transported to the sheet separating apparatus, the retard roller 33 does not follow the separate roller 6, and the lowermost one of the plurality of transported documents is inserted into the document insertion slot 1a. Send back to the side. In this way,
A plurality of originals 5a, 5a,.
Thus, even when the document is fed into the ADF device 1, only one document 5 a is separated by the sheet separating device and fed to the document conveying path.

The document 5a fed from the sheet separating device to the document conveying path is conveyed by the feed roller 34. Here, the rotation speed of the feed roller 34 is set to be higher than the rotation speed of the separate roller 6. . Therefore, as shown in FIG. 7, when the leading end of the original 5a reaches the feed roller 34, the separate roller 6 rotates together with the feed roller 34 until the trailing end of the original 5a is completely removed from the separate roller 6. Spin at speed. As described above, when the separate roller 6 rotates at the same speed as the feed roller 34, the separate roller 6
In contrast, the document is relatively rotated in the document feeding direction.
In such a case, as described above, the one-way clutch 11 is disengaged, and the pickup arm 7 starts rotating upward. In other words, once the document is supplied to the feed roller 34, the pickup roller 9 once rises and the document bundle 5
After the separation roller 6 comes off the rear end of the document 5a at a further distance and a little later, the pickup roller 9 descends again to carry in the next document 5a.

Next, the shutter mechanism will be described. A pivot 16 is provided inside the ADF device 1 relative to the drive shaft 4, and the pivot 16 is rotatably provided on a casing of the ADF device 1. An engaging member 17, a latching member 18, and driving members 19 are fixedly mounted on the pivot 16, and these members rotate integrally with the pivot 16. A support member 46 is fixed on the inner guide 41, and an urging member 20 formed by a spring or the like is interposed between the support member 46 and the hook member 18. The biasing member 20 constantly applies a biasing force in a direction in which the driving members 19 and 19 rotate upward about the pivot 16 as a fulcrum.

A shutter 21 is rotatably provided on the casing of the ADF device 1 on the side of the original insertion opening 1a of the drive member 19. The shutter 21 is pivotally mounted on the casing with a fulcrum shaft 21a, and an arm 21b is fixedly provided from the fulcrum shaft 21a toward the separate roller 6 side. One end of a support shaft 21c is fixed to the tip of the arm 21b, and a shutter 21d is fixed to the other end of the support shaft 21c. As shown in FIG. 5, the shutter portion 21d
It is arranged to be located between the pickup roller 9 and the separate roller 6 in a side view. A guide groove 19a is formed at the tip of the drive member 19, and the support shaft 21c is inserted into the guide groove 19a so as to be slidable. Then, as the driving member 19 rotates up and down, the shutter 21 rotates up and down while sliding the support shaft 21c along the guide groove 19a. With the above configuration, the shutter 21 is urged upward by the urging member 20 via the drive member 19.

As shown mainly in FIG. 3, a projection 8a is formed on the pivot 16 side of the pickup arm 8, and an engagement piece 22 is fixed to the projection 8a. On the other hand, the engaging member 17 is formed with an engaging portion 17a protruding. The rotation of the pickup arms 7 and 8 around the drive shaft 4 causes the engagement pieces 22 and the engagement portions 17a to engage with each other, so that the engagement members 17 can rotate about the pivots 16 as fulcrums. ing. Since the engaging member 17 and the driving member 19 are configured to rotate integrally as described above, the driving member 19 also rotates by the rotation of the engaging member 17. The rotation of the drive member 19 causes the shutter 21 to rotate. The shape of the engaging member 17 is not limited to the above-described configuration. For example, a part of the cylindrical member may be cut out, and the engaging piece may be engaged with the notch.

A mechanism for regulating the rotation of the shutter 21 will be described with reference to FIG. FIG.
FIG. 3 is a side cross-sectional view of the sheet feeding device 2 showing a rotation restricted state of FIG.
In addition, in FIG. 5 and FIGS.
8, the illustration of the urging member 20 is omitted. The support member 46 is provided with a regulating member 23 for regulating the rotation of the shutter 21 as shown in FIGS.
The regulating member 23 includes a solenoid, and the core 24 can be advanced and retracted by turning off and on the electric power to the solenoid. An L-shaped locking member 25 in a plan view is fixed to the front surface of the core 24, and the locking member 25 is provided with an elongated hole through which the pivot 16 can slide. When the hook member 25 is hooked on the pivot 16 by the elongated hole, the core 2
Even if 4 moves back and forth, the position is not shifted with respect to the pivot 16. The L-shaped bottom of the hook member 25 is provided with teeth in a straight line, and a rack portion 25a is formed. Further, teeth are provided in an arc shape at the end of the drive member 19 on the side of the regulating member 23, and a tooth portion 19b is formed. When power is not supplied to the regulating member 23 (OFF state), the rack portion 25a and the tooth portion 19b are engaged. Therefore, in a state where the core 24 is protruding, the engagement is performed at the same time as the core 24 is protruded.
Therefore, the rotation of the driving member 19 is restricted. Accordingly, the rotation of the shutter 21 that is in sliding contact with the drive member 19 is also restricted. In addition, the regulating member 2
3 is driven (ON state), the core 24 is
3, the rack portion 25a and the tooth portion 19b are disengaged from each other. Then, the rotation restriction of the shutter 21 is also released.

The vertical swing of the shutter 21 will now be described.
This will be described with reference to FIGS. FIG. 5 is a side sectional view of the sheet feeding device 2 when the pickup arms 7.8 are at the uppermost position, and FIG. 6 is a side sectional view of the sheet feeding device 2 when the pickup arms 7.8 are at the retracted position. And FIG.
FIG. 5 is a side sectional view of the sheet feeding device 2 when the pickup arms 7 and 8 are at an intermediate position. When the sheet feeding device 2 is not operated, the pickup arms 7 and 8 are waiting at the uppermost position in a rotatable range. At this time, the shutter 21 is lowered, and the tip of the shutter portion 21d is locked in a concave portion provided on the upper surface of the inner guide 41. As a result, even if the document bundle 5 is inserted from the document insertion port 1a, the shutter 21 is not swung and rotated. In the following description, the position of the shutter 21 at this time is referred to as a restriction position. When the feeding of the original bundle 5 is started, the pickup arms 7 and 8 descend, and the pickup roller 9 contacts the upper surface of the original bundle 5 as shown in FIG. With the lowering of the pickup arms 7 and 8, the engagement between the engaging member 17 and the engaging piece 22 is released, and the driving member 19 is raised by the urging of the urging member 20, and the shutter 21 is also raised accordingly. I do. At this time, the positions of the pickup arms 7 and 8 are set as the retracted positions, and the position of the shutter 21 is set as the standby position. Then, when one document 5a is fed to the feed roller 34 side, as described above, the separate roller 6 rotates and the one-way clutch 11 is disengaged, and the pickup arms 7.8 rise. At this time,
The rotation of the drive shaft 4 in the document feeding direction is continued, and when the rear end of the previous document 5a leaves the separate roller 6, the one-way clutch 11 is connected again, and the pickup arms 7.8 start to descend. . During the work of feeding the original bundle 5, the regulating member 23 is turned off so that the shutter 21 stops at the standby position despite the elevation of the pickup arms 7 and 8 as described above. Specifically, when the pickup arms 7 and 8 are raised by a predetermined amount, the engaging members 17 and the engaging pieces 22 are engaged, and the pickup arms 7 and 8 that are going to further raise the engaging members 17. The rotation of the pivot 16 is prevented, but the rotation of the pivot 16 is prevented by the engagement between the rack and the teeth, and the shutter 21 does not descend. The position at which the pickup arms 7.8 are raised by a predetermined height and the engagement members 17 and the engagement pieces 22 are engaged is defined as an intermediate position of the pickup arms 7.8. During the document feeding operation, the pickup arms 7 and 8 swing between the feeding position and the intermediate position, and do not rise to the uppermost position. When all the originals 5a constituting the original bundle 5 are fed into the ADF device 1 and the transfer operation is completed, the pickup arms 7.8 start to rise toward the uppermost position. Here, when the retraction operation is completed, the regulating member 23 is turned on and the regulation of the shutter 21 is released, so that when the pickup arms 7.8 reach the intermediate position, the driving member 19 is moved.
Is driven to lower the shutter 21, and when the pickup arms 7 and 8 reach the uppermost position, the shutter 21 reaches the regulation position.

Next, how the pickup arms 7 and 8 and the shutter 21 are driven during document feeding will be described with reference to FIG. FIG. 8 is a flowchart showing the procedure of the operation of the shutter mechanism. In a rest state of the sheet feeding device 2 (a state in which the sheet feeding device 2 is not operated), as shown in FIG. 4, the shutter 21 is lowered to the regulation position, and the pickup arms 7.8 are located at the uppermost position. Further, when the regulating member 23 is in the OFF state, the core 24 remains protruding, and the rotation of the shutter 21 is regulated. In this state, the user places the document bundle 5 on the inner guide 41 and
The original bundle 5 against the original (step 10)
1).

In this state, when the start key is pressed or the like to instruct the sheet feeding device 2 to start feeding, first, the regulating member 23 is turned on, and the core 24 is moved to the regulating member 23.
1 and 5 in which the rotation restriction of the driving member 19 and the shutter 21 is released, and the state is returned (step 102). Next, the drive shaft 4 is driven, and the pickup arms 7 and 8 start descending from the uppermost position, and reach the retracted position as shown in FIG. The shutter 21 simultaneously rises and reaches the standby position shown in FIG. This shutter 2
When 1 reaches the standby position, the regulating member 23 is turned off, and the rotation of the shutter 21 is regulated. this is,
This is to prevent the shutter 21 from lowering in conjunction with raising the pickup arms 7 and 8 in step 104 described later. Then, the pickup roller 9 is driven to start feeding the original 5a from the original bundle 5 (step 103).

When the originals 5a, 5a,... Are being fed, the pickup arms 7, 8 are swung up and down between the feeding position and the intermediate position as shown in FIGS. Move. In detail, as described above, when the original 5a reaches the feed roller 34 and the feeding of one original 5a is completed, the separate roller 6 rotates, the one-way clutch 11 is disconnected, and the pickup arms 7 and 8 are moved. To rise. Then, when the rear end of the document 5a is separated from the separate roller 6, the one-way clutch 11 is connected again, and the pickup arms 7.8 are lowered to the feeding position, and the document 5a is fed. This operation is repeated until the originals 5a constituting the original bundle 5 are exhausted (step 104).

A DS (original detection) sensor is provided on the pickup roller 9 side of the sheet feeding device 2.
The presence or absence of a document on the supply tray (inner guide 41) is detected by a sensor. When the final document is conveyed into the ADF device 1 after the stacking of the document bundle 5 is completed, the DS sensor is turned off. Then, the regulating member 23 is turned on, and the regulation of the shutter 21 is released (step 1).
05). Next, the drive shaft 4 is driven to rotate in the reverse direction with respect to the document feeding direction, so that the one-way clutch 11 is disengaged, and the pickup arms 7.8 start to ascend. The pickup arms 7 and 8 pass through an intermediate position in the middle of their ascent, and the engagement member 17 engages with the engagement piece 22.
Unlike the state of step 104, there is no regulation of the drive member 19 by the regulation member 23, so that the pickup arm 7
8 further rises, and the shutter 21 also falls in conjunction therewith. Finally, as shown in FIGS. 1 and 5, the pickup arms 7.8 reach the uppermost position, and the shutter 21 reaches the regulation position (step 106).

When the pickup arms 7 and 8 are located at the uppermost position and the shutter 21 is located at the regulating position,
The regulating member 23 is turned off, and the vertical movement of the shutter 21 is regulated again as in the state of step 101 (step 107). As a result, a new document bundle can be set against the shutter 21.

[0026]

According to the present invention, a separate roller disposed on a drive shaft, a pickup arm rotatably provided on the drive shaft as a fulcrum, and a rotatable mount provided at the tip of the pickup arm. A sheet feeder comprising: a pickup roller; and a shutter positioned between the pickup roller and the separate roller and swingably provided from a regulation position for regulating a leading edge of a document. The shutter is raised, and when the pickup roller is raised, the shutter is lowered after rising above a predetermined height, so that the shutter does not lower during the conveyance of the document and the document can be prevented from being damaged. In addition, while providing the rotation fulcrum on the pickup roller side so that the shutter rises away from the leading edge of the document, the rotation fulcrum of the shutter can be provided at a position where a sufficient rotation space for the shutter can be secured.

According to a second aspect of the present invention, there is provided an urging member for urging the shutter so as to always raise the shutter, and an engaging member is fixedly provided to the shutter and the pickup arm, respectively, when the pickup roller descends. Is disengaged,
When the pickup roller is raised to a predetermined height or higher, the pickup roller is engaged so that the pickup arm and the shutter can be engaged or disengaged depending on the vertical swing position of the pickup arm. be able to. For this reason, the lowering width of the pickup arm changes depending on the thickness of the inserted bundle of originals, and the shutter, which is always engaged with the pickup arm and interlocks with it, does not lower sufficiently.
It is possible to prevent the occurrence of such a regulation failure.

[Brief description of the drawings]

FIG. 1 is a side sectional view of an ADF device 1 showing a state where a shutter 21 is lowered.

FIG. 2 is a side cross-sectional view of the ADF device 1 showing a state where a shutter 21 is raised.

FIG. 3 shows a sheet feeding device 2 showing a state where a shutter 21 is lowered.
It is a top view of the principal part of.

FIG. 4 illustrates a sheet feeding device 2 showing a state in which the rotation of a shutter 21 is restricted.
FIG.

FIG. 5 is a side sectional view of the sheet feeding device 2 when the pickup arms 7, 8 are at the uppermost position.

FIG. 6 is a side cross-sectional view of the sheet feeding device 2 when the pickup arms 7, 8 are at a retracted position.

FIG. 7 is a side sectional view of the sheet feeding device 2 when the pickup arms 7.8 are at an intermediate position.

FIG. 8 is a flowchart illustrating a procedure of a shutter mechanism operation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ADF apparatus 2 Paper feeder 4 Drive shaft 6 Separate roller 7.8 Pickup arm 9 Pickup roller 17 Engagement member 19 Link member 20 Energizing member 21 Shutter 22 Engagement piece

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H076 BA17 BA24 BA47 BA49 3F343 FA03 FB02 FB03 FC18 GA01 GB01 GC01 GD01 GE02 HA01 HA31 HC02 JA14 JA16 JD09 KA05 KA06 KB03 KB04 KB05 LA04 LA15 LC14 LC17 LD11 5C072 AA01 BA13 BA02 NA01 NA01 XA01

Claims (2)

[Claims] A separate roller disposed on a drive shaft;
A pickup arm rotatably provided with the drive shaft as a fulcrum, a pickup roller rotatably provided at the end of the pickup arm, and a middle position between the pickup roller and the separate roller for regulating the front end of the document. A shutter provided to be swingable from a regulated position, wherein the shutter rises at the same time when the pickup roller descends, and rises at least a predetermined height when the pickup roller rises, and then descends. A sheet feeding device, characterized in that: 2. An urging member for urging the shutter so as to always move upward, an engaging member is fixedly provided to the shutter and the pickup arm, and disengagement occurs when the pickup roller descends. 2. The sheet feeding device according to claim 1, wherein the pickup roller is engaged when the pickup roller rises above a predetermined height.