JPH07109036A - Paper feeding device - Google Patents

Abstract

PURPOSE:To prevent the duplicate feeding where the loaded papers more than the prescribed value are not duplicately fed and prevent the generation of unexpected troubles in a paper feeding device which feeds the loaded papers while regulating the feeding amount of one-by-one or a constant plural number of paper by a regulating member. CONSTITUTION:A carrying body 20 is constituted b stretching a carrying belt 14 between pulleys 15, 16, and a pressing body 27 to press the loaded papers from the top is provided on the forward side of the carrying body 20. A friction member 22 of the friction coefficient which is smaller than that of a part 14a in contact with the paper P of the carrying belt 14, and larger than that of the loaded paper P is provided on the rear surface of a pressing lower plate 27 b of the pressing body 27. When the rest of the loaded papers P becomes small in feeding the paper, the friction resistance between the highest paper and the friction member 22 is larger than that between the papers P, and the slipping is generated between the papers P before the slipping is generated between the highest paper and the friction member 22, preventing the rest of the papers P from being fed altogether.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper processing apparatus for supplying shredder, printer, copier, facsimile, etc., such as waste paper, transfer paper, copy paper, etc., for shredding, transferring, copying, etc. Applicable. More specifically, the present invention relates to a sheet feeding device that feeds stacked sheets in order from the bottom in such a sheet processing apparatus.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 11, for example, as shown in FIG. 11, in a paper feeding device of this type, papers P are stacked on a tray 1 which is inclined forward and downward, and the stacked papers are stacked. P
Directly press the front end of the pressurizing body 2 from above, and convey belt 3
The stacked sheets P were sent out in order from the bottom while driving the sheet feeding means to regulate the sending amount by the regulating member 4.

[0003]

However, in the conventional sheet feeding device, the portion 2a of the pressing body 2 that comes into contact with the stacked sheets P is used.
Was smaller than that of the stacked paper P. For this reason, especially when the number of stacked sheets P becomes small, slippage may occur between the uppermost sheet having a small frictional resistance and the pressing body 2, and the remaining stacked sheets P may be collectively fed.
That is, when it is necessary to separate and send out one by one like a printer, for example, two or more sheets are sent out at once, or when a certain number of sheets are overlaid and sent out like a shredder, more than one is sent out collectively. There was a problem of causing double feed. Then, due to the double feeding, unexpected troubles such as paper jam, printing failure in the printer, and stoppage due to inability to shred in the shredder may occur.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to prevent the occurrence of unexpected troubles in this kind of sheet feeding device by preventing the double feeding in which the stacked sheets are fed out at a time more than a predetermined number. .

[0005]

Therefore, the present invention provides
For example, as shown in the following illustrated embodiment, the sheets P are stacked and the front end of the stacked sheets P is pressed from above by the pressurizing body 27, and the conveying body 20 is driven to regulate the delivery amount by the regulating member 40. However, in the sheet feeding device 12 that sequentially feeds the stacked sheets P from the bottom, the pressure is applied to the friction member 22 having a friction coefficient smaller than the portion 14a of the transport body 20 that contacts the sheets P and larger than the stacked sheets P. It is provided in a portion 27c of the body 27 that comes into contact with the stacked sheets P.

[0006]

In the present invention, since the frictional resistance between the uppermost sheet P'and the friction member 22 is larger than that between the sheets P, the uppermost sheet P'when the number of stacked sheets P is small. Before the slip occurs between the friction member 22 and the friction member 22, slip occurs between the sheets P, and the remaining sheets P are not sent together.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a schematic diagram showing an internal mechanism of a shredder provided with a paper feeding device according to an embodiment of the present invention.

Reference numeral 10 in the drawing denotes a shredder body.
The shredder main body 10 has a vertically long box shape, and a manual paper feeding input port 10a is opened on the upper left side of the drawing, and a loading guide 10b is provided obliquely downward to the right from the loading port 10a. The paper feed path 10c is formed.
The cutter 11 is installed at the tip of the paper feed path 10c. Then, the paper feeder 12 of the present invention is provided above the shredder body 10.

The paper feeding device 12 is provided with a tray 13a on the upper side of the main body 13 of the device with its front side (the left side in FIG. 2) inclined downward by, for example, about 30 degrees. The opposite side plate 13 in which the
b. The tray 13a is provided with a long opening (not shown) in the paper feeding direction A on the upper surface thereof, and the transport belt 14 is arranged so that the upper side is exposed from the opening. The conveyor belt 14 is stretched between the pulleys 15 and 16 which are respectively supported by the opposite side plate 13b, and the conveyors 20 are constituted by the pulleys 15 and 16. And the pulley 16 on the front side
A paper feeding motor 17 is provided below the. The paper feed motor 17 has a pulley 18 attached to its drive shaft 17a.
Then, a transmission belt 19 is extended substantially horizontally between the pulley 18 and a pulley (not shown) attached to the shaft of the pulley 15 on the front side of the conveyor belt 14.

Further, the apparatus main body 13 includes a pair of side guides 2 for regulating the stacking position of the stacked sheets P on the tray 13a.
1 are provided facing each other. The side guides 21 are provided so as to be movable in association with each other in a direction parallel to the paper feeding direction A and orthogonal to the paper feeding direction A. The space between the side guides 21 can be adjusted according to the size of the paper.

Further, the apparatus main body 13 includes a facing side plate 13
A horizontally long box-shaped storage cover 24 is provided between the front upper side of b, and a pressing means 25 is provided in the storage cover 24. The pressurizing unit 25 includes a pressurizing body 27 that can move up and down along the guide slit 26 of the opposite side plate 13b. In addition, a pressurizing motor 28 provided substantially in the center of the apparatus main body 13, a worm 30 provided on the drive shaft of the pressurizing motor 28, and a worm wheel 31 meshing with the worm 30 are provided. Further, a transmission belt 32 that is wound around a pulley 31 a coaxial with the worm wheel 31 and a drive pulley 33.
And a shaft 35 of the drive pulley 33, a wire 35, and the like, which are stretched between the drive pulley 33 and a driven pulley 34 fixed at a position separated from the drive pulley 33. The wire 35 is the pressing body 2
It is attached to 7. Initially, the pressure body 27 is retracted to the top dead center so that the stacked sheets P can be stacked on the lower tray 13a.

As shown in FIGS. 3 and 4, the pressurizing body 27 includes a pressurizing upper plate 27a having an inverted U-shaped cross section and a pressurizing lower plate 27b having a U-shaped cross section in a predetermined upper and lower range. A plurality of springs 36 that are movably combined and that urge them in a direction in which they are separated from each other, and a pressure detection sensor 37 that operates by the pressure lower plate 27b are provided between them. It is supported and arranged by 27a. Further, the pressure lower plate 27
In the lower surface 27c of b, that is, the portion that contacts the stacked sheets,
A sheet-shaped friction member 22 having a friction coefficient smaller than a portion 14a of the transport belt 14 that contacts the paper P and larger than that of the stacked paper P is attached. The strength of the spring 36 when attached is set to, for example, 3 to 5 kg. Therefore, the operation of the pressurizing motor 28 is controlled by turning on and off the pressurizing sensor 37.

That is, when the pressure body 27 presses the stacked sheets P with a predetermined pressure, as shown in FIG.
b is pushed up against the spring 36, the pressure detection sensor 37 is turned on, the pressure motor 28 is turned off, and the lowering of the pressure body 27 is stopped. Pressurizing motor 28
Is rotated for a while even after being turned off, the pressure detection sensor 37 is further pushed into the actuator within the range of overtravel. When the stacked sheets P decrease, the pressure lower plate 27b is pushed down by the spring 36, and the actuator of the pressure detection sensor 37 returns to a position beyond the release position, so that the sensor 37 is turned off. Then, the pressurizing motor 28 is turned on, and the pressurizing body 27 descends until the pressurization detecting sensor 37 is turned on again. Therefore, the pressure body 27
Always presses the stacked sheets P within a constant pressure range, and prevents the sheet conveyance force from being lowered and the sheet not to be fed.

Further, in the sheet feeding device 12, as shown in FIG. 2, the front side between the opposing side plates 13b is covered with the lateral cover 39,
The lateral cover 39 is rotatably supported around a support shaft (not shown) above the front side of the facing side plate portion 13b for paper jam processing or the like. The horizontal cover 39 has a plate-shaped metal holder 41 attached to the pressurizing means 25 side via an attachment portion 41a.

As shown in FIG. 6, the holder 41 is formed by bending the lower end of the holder 41 into an L shape, and an elongated regulating member 40 made of urethane rubber or the like is attached to the mounting member 42 at the center of the lower end in the width direction. Install through. Then, as shown in FIG. 2, a gap g is formed between the regulation member 40 and the tray 13a. The holder 41 can be automatically moved up and down by a gap adjusting mechanism (not shown) including a gap control motor and the like to adjust the size of the gap g.

Thus, in the sheet feeding device 12, the curved sheet conveying path 4 leading from the gap g to the sheet feeding path 10c.
3 is formed, and the conveyance rollers 4
4 is provided, and a conveyance roller 55 is provided at the tip of the paper conveyance path 43.

Next, FIG. 7 shows the electrical construction of the sheet feeding device 12. The paper feeding device 12 is entirely controlled by a microcomputer. The CPU 45 of the microcomputer determines, for example, whether the pressure detection sensor 37 is on or off, and controls the driver circuit 46 that drives the pressure motor 28. When the paper P is jammed in the paper transport path 43, the jam detection sensor 47 detects it. The presence / absence of the paper P on the tray 13a is detected by the paper presence / absence sensor 48, and the fact that the pressure body 27 is retracted to the top dead center is detected by the top dead center sensor 49. Further, the paper feeding device 12 is electrically connected to the shredder main body 10 by the connector 50, and the current detection sensor 51 can detect that the shredder main body 10 is overloaded and stopped.

In the illustrated shredder, when the paper P is shredded, as shown in FIG.
Load on a. Then, the side guide 21 is moved according to the width size of the stacked sheets P, and the side guide 2 is moved.
1 is applied to the side edge of the stacked sheets P. Next, a start switch (not shown) is pressed to start the apparatus main body 13, the pressurizing motor 28 is driven to operate the pressurizing means 25, and as shown in FIG. Press the front end side of the feeding direction A from above.

Therefore, at the time of sheet feeding, the sheet feeding motor 17 is driven to rotate the conveyor belt 14 to feed the stacked sheets P from below. Then, while the feed amount is regulated by the regulating member 40 to a number (for example, 3 or less) that can be shredded by the cutter 11, the stacked sheets P are conveyed in the direction A from the bottom. Then, the pair of transport rollers 4 passes through the paper transport path 43.
Transported at 4.44, and the transport roller 55 transports the shredder body 10
Is fed to the sheet feeding path 10c. Then, the stacked paper P
Is shredded with a cutter 11.

After feeding all the stacked sheets P,
The paper presence sensor 48 detects the absence of paper, the driving of the paper feeding motor 17 is stopped after a lapse of a certain time, the pressurizing body 27 is raised and retracted to the top dead center, and the paper feeding device 12 is moved to the position shown in FIG. Return to the ready state shown in.

By the way, in the paper feeding device 12 of the present invention,
During paper feeding, as shown in FIG. 10, when the stacked sheets P are running low (for example, when the remaining five sheets are left), the frictional resistance between the uppermost sheet P ′ and the friction member 22 is equal to that between the sheets P. Since it is larger than the above, slippage occurs between the paper P before the slippage occurs between the uppermost paper P ′ and the friction member 22,
The remaining sheets P are not fed all at once.
Then, the regulation member 40 regulates the delivery amount to a predetermined amount of three or less and delivers the stacked sheets P in order from the bottom.

[0022]

Therefore, according to the present invention, in the paper feeding device that presses the front end portion of the stacked sheets from above with the pressurizing member and sends out the stacked sheets while the delivery amount is regulated by the regulating member, Since the frictional resistance between the friction members is larger than that between the sheets, slippage occurs between the top sheets and the friction member before the slippage occurs even when the remaining sheets are low, and the remaining sheets remain. It is possible to prevent double-feeding in which the number of sheets exceeds the planned number and to reliably convey the sheets after the planned number of sheets by properly selecting the material, shape, etc. of the restriction member it can. As a result, in addition to the occurrence of a paper jam, it is possible to prevent the occurrence of an unexpected trouble such as a printing failure in the printer and a stop due to the shredder being unable to shred.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a state in which stacked sheets are held by a pressing body of a sheet feeding device according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram showing an internal structure of the sheet feeding device and an upper portion of a shredder main body provided with the sheet feeding device.

FIG. 3 is a front view of a pressing body of a pressing unit in the sheet feeding device.

FIG. 4 is a side view showing the inside of the pressurizing body in section.

FIG. 5 is a side view of the pressed state.

FIG. 6 is an exploded perspective view of a regulating member, its holder, and a mounting member in the sheet feeding device.

FIG. 7 is a block diagram showing an electrical configuration of the sheet feeding device.

FIG. 8 is a diagram showing a state in which stacked sheets are set in the sheet feeding device.

FIG. 9 is a ready state diagram of the sheet feeding device before setting stacked sheets.

FIG. 10 is a partial enlarged view showing a state of feeding stacked sheets in the sheet feeding device.

FIG. 11 is a schematic front view of a conventional paper feeding device.

[Explanation of symbols]

 12 Paper Feeding Device 14a Paper Contact Portion of Conveyor 20 Conveyor 22 Friction Member 27 Pressurizing Body 27c Paper Contacting Portion of Pressurizing Body 40 Regulation Member P Paper

Claims (1)

[Claims] 1. A paper feed for stacking sheets and pressing the front end of the stacked sheets from above with a pressurizing member, driving the conveying member, and feeding the stacked sheets in order from the bottom while regulating the delivery amount by a regulating member. In the apparatus, a sheet feeding device comprising a friction member having a friction coefficient smaller than a portion of the transport body that comes into contact with sheets and having a friction coefficient larger than that of the stacked sheets, in a portion of the pressurizing body that comes into contact with the stacked sheets. .