JP2997603B2 - Feeding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a feeding device used in a copying machine, a laser beam printer, and the like, and more particularly, to a feeding device provided with a double feed preventing member for a sheet material.

[0002]

2. Description of the Related Art An example of a conventional feeding device will be described with reference to FIG. The sheet feeding device 50 includes a sheet feeding rotator 15 that feeds the sheet material S, a separation pad 4 (separating unit) that contacts the sheet feeding rotator 15 and separates the sheet material S, and a sheet material that is fed. And a transport rotating body pair 9 for transporting S. Also,
A cam 6 (release means) and a control ring 32 of a spring clutch are coaxially provided on the shaft of the paper feed rotating body 15, and a claw 32a for locking the movement of the control ring is provided on the control ring 32. Is provided. The claw 32a is connected to the actuator 31a.
, And the actuator 31a is controlled by a solenoid 31 that synchronizes with the paper feed rotating body 15 by one rotation. That is, the solenoid 31 operates in accordance with the movement of the paper feed rotating body 15, whereby the actuator 31a locks or releases the claw 32a of the control ring 32.

The separation pad 4 is attached to a free end of a support member 5 which is supported on a support shaft 5a and is rotatably movable, and is urged toward a paper feed rotating body 15 by a pressure spring 16. . The support member 2 is rotatably mounted on a support shaft 2a. The support member 2 is provided with a loading plate 1 on which the sheet material S is loaded, and a release portion 1a which abuts on the back surface of the support member 5 and presses the support member 5 downward. The end is adapted to contact the cam 6. That is, when the cam 6 comes into contact with the free end of the support member 2, the support member 2 is pushed downward, so that the release portion 1a provided on the pressing plate 1 presses down the support member 5 and the separation pad 4 The contact between the sheet and the sheet supply rotating body 15 is released. Therefore, the separation pad 4 and the paper feed rotating body 1
When the sheet 5 contacts the sheet material S, the sheet material S is fed. However, when the contact is released, the sheet material S cannot be fed.

[0004] The fed sheet material S is guided by a pair of rotating conveying members by a guide member 13 and is conveyed by the pair of rotating conveying members.

[0005]

However, in the above-mentioned conventional example, the fed sheet material is brought together with the sheet material to be fed next by a force such as a frictional force or an electrostatic force acting between the sheet materials. There is a problem that the paper is fed and a conveyance failure such as a jam occurs. FIG. 10 is a diagram for explaining this problem. The sheet material S1 to be originally fed is double-fed with the sheet material S2 to be fed next, and the sheet feeding operation is stopped.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a feeding device that prevents double-feeding of sheet materials.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has an object to rotate a sheet feeding rotator for feeding a sheet material from below with a predetermined pressure. Contacting separating means, a conveying rotator pair for conveying the fed sheet material, and a guide member for guiding the lower surface of the fed sheet material to guide the sheet material to the conveying rotator pair,
A feeding device that feeds and conveys the sheet material one by one, wherein when the sheet material is conveyed by a convey rotator pair, the contact between the sheet feeding rotator and the separation unit is performed. Release means for releasing, and a guide member provided at the guide member at a position not in contact with the sheet rotating body and adjacent to the separating means, and when the separating means is in contact with the sheet rotating body, the separation is performed. When the contact between the sheet feed rotating body and the separation unit is released by the release unit,
Double feed prevention means for locking a sheet material to be double-fed with the sheet material conveyed by the pair of conveyance rotators positioned above the separation means to prevent the sheet material from advancing. It is characterized by.

For example, the double feed prevention means includes a locking portion for locking the leading end of the sheet material to be double fed.

The cross section of the double feed prevention means in the sheet material advancing direction has a stepped shape, and each step portion is a locking portion.

[0010]

Further, the double feed prevention means is provided on a side opposite to the transport rotary body from a pressure contact portion between the paper feed rotary body and the separating means.

Further, the double feed preventing means is integrated with the guide member.

Further, the double feed preventing means has a friction member.

Further, the feeding device has a regulating plate for regulating the position of the side edge of the sheet material by abutting the side edge of the sheet material, and the transport rotating body pair A driving roller composed of a friction member, and a driven roller whose axis is disposed at a twisted position with respect to the axis of the driving roller, and that is in pressure contact with the driving roller, the driving roller and the driven roller The sheet material is sandwiched between the nip portions, the sheet material is skewed by the driven rollers, and the sheet material is brought into contact with the regulating plate to regulate the side edge of the sheet material. Is transported.

[0015]

The guide member guides the lower surface of the sheet material separated and fed one by one by a sheet feeding rotating body for feeding the sheet material and separating means contacting the sheet feeding rotating body from below with a predetermined pressure. Then, the sheet material is guided to the conveying rotating body pair. And
When the separating means is in contact with the rotating sheet feeding member, the sheet material is not locked because the double feeding preventing means provided on the guide member is located below the separating means, and the sheet material is conveyed by the conveying rotating member pair. When the contact between the sheet feeding rotating body and the separating means is released by the releasing means, the sheet material that is double-fed with the sheet material conveyed by the pair of conveying rotating bodies is locked because it is located above the separating means. I do.

[0016]

[0017]

【Example】

<Embodiment 1> Embodiment 1 of the present invention will be described with reference to FIGS. FIG. 1A is a side view showing the configuration of the feeding device. In FIG. 1A, a loading plate 1 on which a sheet S is loaded is fixed to a support member 2 rotatably supported by a support shaft 2a. And can be moved upward and downward (upward in FIG. 1) by the pressure spring 3. The support member 5 is rotatably supported by a support shaft 5a, and a separation pad 4 made of a friction member such as rubber is provided at a free end thereof, and is attached to the support member 2. A release portion 1 a is provided on the free end side of the loading plate 1, and the lower end thereof presses the support member 5. Thus, when the support member 2 is pressed by the rotation of the cam 6, the release portion 1a comes into contact with the support member 5, so that the separation pad 4 is pressed down.

Below the separation pad 4 (on the left side in FIG. 1), there is provided a pair of conveying rotators 9 including a driving roller 7 and a driven roller 8 which is pressed against and driven by the driving roller 7. Before and after 9, guide members 10, 11, 1
2 and 13 are provided respectively. The fed sheet material S is guided on the lower surface thereof and guided along the guide surface of the guide plate 13 (guide member) to the conveying rotating body pair 9. The separation pad 4 at the time of feeding is located at a position protruding from the sheet material passing surface of the guide member 13.

FIG. 1B is a top view of the guide plate 13, and shows a double feed prevention member 13a (a double feed member) having locking portions 13b on both sides of a groove H in which the separation pad 4 is provided. Feeding prevention means) is formed. Furthermore, this double feed prevention member 13
“a” is provided so as to be located below a contact surface formed by the separation pad 4 rising and contacting the sheet feeding rotating body 15 at the time of separation / sheet feeding.

As shown in FIG. 2, the support shaft 14 is connected to the feeding device 5.
0 side plate and supporting plates 51a, 51c formed in the vicinity thereof
The shaft 14 is rotatably disposed via a bearing 52. One end of the support shaft 14 supports a paper feed rotating body 15 made of a friction member. At the other end, a cam 6 and a paper feed rotating body 15
And a spring clutch mechanism 30 for controlling one rotation.

In FIG. 1A, a driving force is transmitted to a pair of conveying rotators 9 and a sheet feeding rotator 15 by a driving source (not shown). Here, the peripheral speeds of the feed rotating body 15 and the transport rotating body pair 9 are set to be equal, and the circumferential length of the friction portion of the feed rotating body 15 is determined by the feeding point (the leading end of the sheet material S). Is configured to be longer than the distance from the transfer rotator pair 9 to the nip portion (the distance between P and N).

When the sheet material S is stacked on the stacking plate 1, the separation pad 4 and the stacking plate 1 are in a lowered state as shown in FIG. 4 and the sheet material S are waiting at a position where they do not contact. Further, the separation pad 4 is provided below the sheet material passage surface of the guide member 13.

Next, the operation of the feeding device 50 will be described with reference to FIG. FIG. 3A shows a standby state of the sheet feeding operation, in which the actuator 31a of the solenoid 31 is controlled by the control ring 3.
Even if the drive is transmitted to the gear (FIG. 2) 33, the feed rotary member 15 is stopped by the action of the spring clutch 30 while maintaining the standby position of FIG. 3 (a). are doing. At this time, the sliding portion 6 a of the cam 6 is in contact with the free end of the support member 2, and the loading plate 1 is pushed down against the pressure spring 3. Further, the release portion 1a of the loading plate 1 abuts on the support member 5 of the separation pad 4 and pushes the separation pad 4 downward against the separation spring 16.

In the above state, the sheet feeding operation is started by supplying a current to the solenoid 31. FIG. 3B shows a paper feeding state. When a current flows through the solenoid 31, the actuator 31a moves in the direction of arrow D1 to move the control ring 32.
Is released. As a result, the driving force is transmitted to the support shaft 14, and the cam 6 and the paper feed rotating body 15 start rotating simultaneously in the arrow direction D2.

Then, the support member 2 of the loading plate 1 is rotated along the sliding portion of the cam 6 in the direction of arrow D3 around the support shaft 2a, whereby the separation pad 4 is rotated by the paper feed rotating body. 15 is pressed. Since the double feed prevention member 13a provided on the guide member 13 is located below the pressure contact surface between the paper feed rotating body 15 and the separation pad 4, the leading end of the uppermost sheet material S1 picked up is the double feed. The sheets are separated and fed one by one without being locked by the prevention member 13a.

Next, in FIG. 3 (c), after the sheet feeding rotator 15 is rotated until the fed sheet material S1 is nipped by the conveying rotator pair 9 and conveyed, the supporting member of the loading plate 1 is rotated. 2 is gradually pushed down in the arrow direction D7 by the cam 6,
In conjunction with this, the support member 5 and the separation pad 4 also rotate in the arrow direction D8. Thereafter, the claw 32a of the control ring 32 is locked by the actuator 21a and returns to the state shown in FIG.

At this time, as shown in FIG. 4A, the sheet material S1 is conveyed to the downstream side by the convey rotator pair 9, but the sheet material S1 is conveyed upstream (right side in FIG. 4) of the sheet feeding rotator 15. S1 presses the lower sheet material S2 downward. Then, a frictional force or an electrostatic force acts between the sheet materials S1 and S2, and the sheet material S1 is conveyed to the downstream side so as to drag S2 (double feeding).

However, the leading end of the fed sheet material S2 is locked by the locking portion 13b of the double feed prevention member 13a provided on the guide member 13 as shown in FIG. 4 (b). The locking portion 13b is provided so as to form an acute angle with the surface of the sheet material S2, and can be locked effectively. Further, since the double feed prevention member 13a is provided adjacent to the paper feed rotating body 15, the locked sheet material S2 does not skew.

The sheet material may be, for example, a transfer material, a recording paper, a printing paper, an OHP paper, a document, a postcard, an envelope, a card, a film, a plastic, a metal, a cloth, etc., but is not limited to any of them. Not something. Also,
The sheet material does not need to be one sheet and may be a so-called multi-sheet such as a slip or a booklet. <Embodiment 2> Embodiment 2 of the present invention will be described with reference to FIG. Since the basic configuration is the same as that of the first embodiment, the same reference numerals are given and only different points will be described.

On the guide member 18, a double feed prevention member 18a having a stepped cross section in the traveling direction of the sheet material S is provided.
Each step has locking parts 18b and 18c, respectively.
This makes it possible to lock even a plurality of sheet materials to be double-fed together. <Embodiment 3> Embodiment 3 of the present invention will be described with reference to FIG. Since the basic configuration is the same as that of the first embodiment, the same reference numerals are given and only different points will be described.

On the guide member 19, a double feed prevention member 20 made of a friction member is provided. Double feed prevention member 20
As the coefficient of friction is higher, the sheet material does not slip, so that it can be locked even if it is slightly caught. In this case, it is effective. Of course, a plurality may be provided. <Embodiment 4> Embodiment 4 of the present invention will be described with reference to FIG. Since the basic configuration is the same as that of the first embodiment, the same reference numerals are given and only different points will be described.

In the above-described embodiment, the double feed prevention member 17a is disposed near the press-contact surface between the separation pad 4 and the paper feed rotating body 15, so that the separation pad 4 is adjacent to the paper feed rotating body 15. Had to be provided. However, in this case, the area for locking the sheet material S2 fed together is reduced by at least four separation pads. Therefore, in the fourth embodiment, the separation pad 4 is provided on the transport rotating body pair 9 side in order to more effectively function the double feed prevention member 17a. FIG. 7C shows a top view of the guide plate 17. In the figure, a separation pad 4 is provided in a groove H, and a double feed prevention member 1 is
7a is provided. Therefore, the sheet material S which was double-fed
2 can be effectively locked.

Next, a description will be given of an embodiment of a sheet feeding device having a function of defining the conveying position of the fed sheet material S. FIG.
(a) shows a top view of the feeding device, and (b) of FIG. 8 shows a side view thereof. Since the basic configuration is the same as that of the above-described embodiment, only differences will be described. The feeding device according to the present invention includes a pair of conveying rotators 21 for conveying the fed sheet material and a regulating plate 27 for restricting the position of the side edge of the sheet material S. Has a drive roller 22 driven by a drive source (not shown), and a driven roller 23 urged against the drive roller 22 by a spring 25. The axis of the driven roller 23 is provided obliquely to the axis of the drive roller 22.

In the above configuration, the sheet material S fed to the pressure contact surface between the drive roller 22 and the driven roller 23
Is skewed because the drive roller 22 and the rotating shaft of the driven roller are oblique. However, since the regulating plate 27 is provided on the path of the sheet material S, the sheet material S is conveyed while following the regulating plate 27. As a result, the side edge of the sheet material S coincides with the regulating plate 27, and the position of the side edge of the sheet material S is regulated.

In the above-described embodiment of the present invention, the paper feed rotating body 15 is a cylindrical roller, but a half-moon roller 40 may be used as shown in FIG.

[0036]

According to the present invention, double feed prevention can be prevented by providing a double feed prevention member for locking a sheet material to be double fed by a fed sheet material. In particular, even when sheets having high adhesion between sheets used in an overhead projector or the like are used, a sheet feeding failure does not occur, and the reliability is improved.

[Brief description of the drawings]

1A and 1B are diagrams applied to an embodiment of the present invention, wherein FIG. 1A is a side view of a feeding device, and FIG. 1B is a top view of a guide member.

FIG. 2 is a top view of the feeding device applied to the embodiment of the present invention.

FIGS. 3A and 3B are side views illustrating a paper feeding state of the feeding device applied to the first embodiment of the present invention, wherein FIG.
FIG. 9 is a state diagram during paper feeding, and FIG.

FIGS. 4A and 4B are diagrams illustrating a sheet feeding state of the feeding device applied to the first embodiment of the present invention, wherein FIG. 4A is a state diagram immediately after sheet feeding, and FIG. .

FIG. 5 is a side view of a feeding device applied to a second embodiment of the present invention.

FIG. 6 is a side view of a feeding device applied to a third embodiment of the present invention.

FIGS. 7A and 7B are side views of the feeding device applied to the fourth embodiment of the present invention, in which FIG.
(c) is a top view of the guide member.

FIG. 8 is a diagram of a feeding device applied to the embodiment of the present invention;
(a) is a top view and (b) is a side view.

FIG. 9 is a side view of a feeding device applied to the description of the conventional example.

FIG. 10 is a side view of a feeding device showing a problem of the conventional feeding device.

[Explanation of symbols]

 4 Separation Pad (Separation Means) 6 Cam (Release Member) 9 Conveyor Rotator 13 Guide Member 13a Double Feed Prevention Member 13b Engagement Unit 15 Feed Rotator 17 Guide Member 17a Double Feed Prevention Member 17b Engagement Unit 18 Guide Member 18a Double feed prevention member 18b Lock portion 19 Guide member 19a Double feed prevention member 19b Lock portion 20 Drive roller 21 Followed roller S Sheet material S1 Sheet material (feed sheet material) S2 Sheet material (following double feed sheet material)

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takayoshi Inoue 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (56) References JP-A-4-350033 (JP, A) (58) Survey Field (Int.Cl. ⁷ , DB name) B65H 1/00-3/68

Claims (7)

(57) [Claims] 1. A sheet feeding rotator for feeding a sheet material, separating means for abutting the sheet feeding rotator from below at a predetermined pressure, and a conveying device for conveying the fed sheet material. A rotating member pair, and a guide member for guiding a lower surface of the fed sheet material to guide the sheet material to the conveying rotating member pair, and the sheet material is one sheet. A feeding device that feeds and conveys the sheet material one by one; when the sheet material is conveyed by a pair of convey rotators, a release unit that releases contact between the feed rotator and the separation unit; With the separating means
It provided in the guide member to be adjacent, the separating means
When it is in contact with the paper feed rotating body, the separation means
Located below, wherein the time of contact release of the paper feed rotating member by releasing means and said separating means, above said separating means
Position to engaged the sheet material to the double feed him to the sheet material conveyed by the conveying rotating body pair, characterized in that it comprises a multi-feed preventing means for preventing the progression of the sheet material Feeding device. Wherein wherein the double feed preventing means comprises a locking unit for locking the front end portion of the sheet material to the double feed him
The feeding device according to claim 1, wherein 3. The feeding device according to claim 2, wherein a cross section of the double feeding prevention means in the sheet material advancing direction has a stepped shape, and each step portion is a locking portion. 4. A feeding device of the double feed preventing means, according to claim 1, characterized in that provided adjacent to the paper feed rotating member. Wherein said double feed preventing means, the guide member sheet of claim 1, wherein the integrated with feeder. 6. The double feed prevention means has a friction member .
The feeding device according to claim 1, wherein: 7. The sheet feeding device has a regulating plate that regulates the position of the side edge of the sheet material by contacting the side edge of the sheet material; A driving roller formed of a friction member, and a driven roller whose axis is disposed at a twisted position with respect to the axis of the driving roller, and which is in pressure contact with the driving roller. The driving roller and the driven roller The sheet material is sandwiched between the nip portions, the sheet material is skewed by the driven rollers, and the sheet material is brought into contact with the regulating plate to regulate the side edge of the sheet material. Convey
The feeding device according to claim 1, wherein: