JPH0459526A - Sheet feeding device - Google Patents

Abstract

PURPOSE:To prevent wear of a guide plate and the occurrence of a multiple feed and to feed sheets at a stable separation period by a method wherein a line for interconnecting the ridge lines of heat parts located on both sides of the sheet feed belt of a guide plate with a distance therebetween is caused to enter the belt side by a specified distance from the under surface of the belt. CONSTITUTION:A guide plate 31 is formed of a metallic plate or rigid rubber, and the central part of the upper edge of the guide plate is notched in width wider than the width of a sheet feed belt 21 to form tops 31a and 31b on both sides. The top parts 31a and 31b are positioned on both sides in the direction of width of the under surface of the belt 21, and fixed in a position where a line for interconnecting the ridge lines of the top parts 31a and 31b is positioned flush with the under surface of the belt 21 or is caused to enter the belt side by a microsize delta. The guide surface, containing the top parts 31a and 31b, of the plate 31 is inclined in the feed direction of the belt 21 based on the under surface of the belt 21, and this constitution facilitates the smooth passage of sheets 12.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a paper feeding device for paper industries such as printing machines, copying machines, automatic bill dispensers, etc. The present invention relates to a paper feeding device that conveys paper products by frictional force with a paper feeding belt, and separates and feeds multiple sheets of paper products one by one through this transportation.

[Conventional technology]

A conventional paper feeding device consists of a stacking table for stacking paper sheets, an endless paper feeding belt for feeding out the paper sheets placed on the stacking table, and a multi-feeding system using the paper feeding belt. It consists of a separating device that separates the incoming paper sheets one by one.

This separation device has the top of a guide plate in contact with the paper feed belt, and the paper sheets that have been fed multiple times are brought into contact with the guide plate by the frictional force caused by the contact between the paper feed belt and the paper sheets, Only the uppermost sheet that is in direct contact with the paper feed belt is allowed to enter between the guide plate and the paper feed belt and separated one by one.

In addition, a separation roller is provided in pressure contact with the endless paper feed belt, and this separation roller is rotated in the opposite direction to the feeding direction of the paper feed belt, so that when two or more sheets are fed, A cut sheet feeding device (Japanese Unexamined Patent Application Publication No. 1-285542) is known in which paper sheets other than the uppermost sheet on the paper belt side are separated by a separation roller.

[Problem to be solved by the invention]

Among the above-mentioned conventional techniques, a separating device in which a guide plate is brought into contact with a paper feed belt has a problem with its lifespan due to severe wear at the contact portion between the paper feed belt and the guide plate. There is a problem in that paper sheets passing between the guide plate and the paper feed belt generate paper dust due to sliding on the guide plate.

On the other hand, attempts have been made to provide a gap between the top of the guide plate and the paper feed belt in order to prevent the abrasion of the contact portion as described above, but there is a problem in that multiple feeding cannot be prevented.

On the other hand, a method in which a separation roller is pressed against the paper feed belt and reversed is effective in preventing multiple feeds, but since the roller is reversed, there is a problem in terms of wear, and the sheets to be separated are subjected to ILB. There is a problem that the interval (separation period) is not stable.

The present invention solves the conventional problems as described above, prevents wear of guide plates, etc., and prevents multiple feeding.
Moreover, it is an object of the present invention to provide a paper feeding device that can feed paper sheets at a stable separation cycle.

[Means to solve the problem]

In order to achieve the above object, the paper feeding device of the present invention is arranged in contact with a loading table on which a plurality of paper articles are placed in a stacked manner, and the uppermost paper article of this loading table, and is arranged in a fixed direction. It includes an endless paper feed belt that is rotationally driven, and a guide plate that is disposed at a position where the leading edge of the paper sheets sent out by the paper feed belt comes into contact with the paper feed belt. having apexes spaced on both sides;
A line segment connecting the ridge lines at the top is provided at a position that is more convoluted than the lower surface of the paper feed belt by a certain distance on the paper feed belt side.

[Effect]

With this configuration, according to the present invention, the above object is achieved by the following actions.

The paper sheets placed on the mounting table receive a conveying force due to friction due to the rotation of the paper feed belt, and are sent out in the rotational direction of the belt.

The paper sheets sent out in this way hit the guide plate from the leading edge, but since the conveying force of the paper feed belt is sufficiently large, the paper industry uses the top of the guide plate provided on both sides of the paper feed belt from the leading edge. You will be sent out after getting over it. The top of this guide plate is more convoluted on the belt side than the bottom surface of the paper feed belt that the paper sheets are in contact with, so when the paper sheets are fed out over the top of the guide plate,
The paper sheets are fed out while being gently bent and deformed by the bottom surface and the tops on both sides of the paper feed belt. This deformation causes a reaction force to act between the top of the guide plate and the paper sheet, and the friction with the guide plate caused by this reaction force causes
A force (hereinafter referred to as entry resistance force) in the opposite direction to the conveying force of the paper feed belt acts on the paper sheet. If this approach resistance force is made smaller than the conveyance force applied to the uppermost sheet that is in direct contact with the paper feed belt, the uppermost sheet will be sent out over the guide plate.

On the other hand, other sheets that are multiple-fed together with the topmost sheet are conveyed by the frictional force between them and the topmost sheet. Since the coefficient of friction between the sheets is smaller than the coefficient of friction between the paper feed belt and the uppermost sheet, the conveyance force applied to other sheets that are fed multiple times is small.

Therefore, the conveying force of the other paper sheets is smaller than the entry resistance force acting due to the friction with the guide plate, and the other paper sheets stop at the spot without being able to get over the top of the guide plate. As a result, only the uppermost sheet is separated and sent out, thereby reliably preventing multiple feeding. This operation is repeated thereafter.

Further, as described above, since the paper feed belt and the guide plate are not in contact with each other, problems such as wear hardly occur. Furthermore, since it is not a reversing roller system, the separation synchronization is also stable.

〔Example〕

Hereinafter, the present invention will be described in detail based on the drawings. FIG. 1 is a perspective view of one embodiment of the present invention, FIG. 2 is a side view of FIG. 1-FIG. 3 is a rear view of FIG. FIG. 3 is an explanatory diagram of the operation of the paper device.

The paper feeding device of this embodiment includes a paper sheet mounting table section 10, a paper feeding section 20, a multiple feeding prevention section 30, and a conveyance section 40.

The placing table part 1゜0 includes a placing table 11 on which the paper sheet 12 is placed, a side plate]3 provided on this placing table 11 for regulating the position of the paper sheet 12, and a placing table]-1 as the number of paper sheets 12 decreases. It is equipped with a motor (not shown) for sequentially raising it.

The paper feed section 20 is a device that feeds the paper sheets 12 stacked on the mounting table -1 to the multiple feed prevention section 3o.

The paper feeding section 20 includes a conveyance roller 33, a driven roller 22 provided parallel to the conveyance roller 33, and an endless paper feed belt 2 wound around these rollers with a constant tension.
1. Timing pulleys 23a and 23b are provided coaxially with the conveyance roller 33 and the driven roller 22, respectively, and a timing belt 24 is wound around these pulleys.

The conveyance roller 33 and the timing pulley 23a are connected to the shaft 25.
It is rotated by a drive motor 26 via.

The paper feed belt 21 is made of soft rubber with a high coefficient of friction. The end of the paper feed belt 21 on the driven roller 22 side is moved by its own weight or by a pressing means to the uppermost paper sheet 12a of the paper sheet 12.
is pressed against the top surface of the

The multiple feed prevention unit 30 separates the paper sheets sent from the paper feed unit 20 one by one and transfers them to the conveyance unit 4 at regular intervals.
It is a device that sends out to 0.

The multiple feed prevention unit 30 includes a separation roller 34 that is placed opposite to the conveyance roller 33 with the paper feed belt 21 sandwiched therebetween, and a guide plate 3 that is provided to face the lower surface of the paper feed belt 21.
1. The shaft 32 of the separation roller 34 is rotatably supported by a pair of links 36 that can rotate in a fan shape about a shaft 37 . As shown in FIG. 2, the end of the link 36 on the shaft 37 side is connected to the machine frame 51 via a tension-biased spring 39.
is pressed against the paper feed belt 21 with a constant force, and the separation roller 34 rotates in accordance with the rotation number of the paper feed belt 21. Also, shafts 32 and 37
are interconnected by gears 35a and 35b. Furthermore, a force greater than the set load is applied to the shaft 32 of the separation roller 34.
A torque limiter 38 is provided to stop the rotation when the torque is applied to the torque.

On the other hand, the guide plate 31 is formed using a metal plate or hard rubber, and the center part of the upper edge is cut out to have a width wider than the width of the paper feed belt 21.
1a and b. Then, the top portions 31a, b are positioned on both sides of the lower surface of the paper feed belt 21 in the width direction, and the line connecting the ridge lines of the top portions 31a, b is flush with the bottom surface of the paper feed belt 21, or the minute dimension ( It is fixed in accordance with the position where it is inserted into the belt side by δ (hereinafter referred to as the insertion amount). In addition, the top 3 of the guide plate 31
The guide surfaces including 1a and 1b are provided so as to be inclined in the feeding direction JJ of the paper feed belt 21 with respect to the lower surface of the paper feed belt 21, thereby making it easier for the paper sheet ]-2 to pass smoothly. .

The conveyance section 40 conveys the paper products separated one by one by the multiple feed prevention section 30 to the next process. This conveying section 4o has two parallel shafts 43, 4 between the machine frame side plates 45.
4, and a pair of left and right drive rollers 4.1 are attached to this shaft 43.
．． 41 is fixed, and driven rollers 42 and 42 that roll in contact with the drive rollers 41 and 41 are fitted onto the shaft 44, respectively, and the shaft 43 is fixed.
A drive motor 46 is provided outside the machine frame side plate 45 at the end of the frame.

Next, the operation of this embodiment will be explained. The paper sheets 12 stacked on the mounting table 11 rise as the mounting table 11 rises. The ascending paper sheet 12 overcomes the weight of the paper feed section 20 or the like or the pressing force of the pressing means, and pushes the paper feed belt 21 upward. At this time, the position of the paper feed belt 21 is detected by a detection means (not shown), and the mounting table 11 is stopped when it has risen to a predetermined position. After stopping, when the drive motor 26 is started, the paper feed belt 21 that is interlocked with the drive motor 26 rotates. As a result, the uppermost sheet 12a is fed out by the frictional force acting on the paper feed belt 21 and the uppermost sheet 12a. At this time, the paper sheets 12b and 12c stacked on the lower side also move due to the frictional force between the sheets and come into contact with the guide plate 31. However, the top leaf 12
This is because the frictional force between a and the paper feed belt 21 is large.

Only the uppermost sheet 12a is separated and the guide plate 31
The paper passes over the top of the sheet and is sent out between the separation roller 34 and the paper feed belt 21 via the drive roller 41 and the driven roller 42. This operation is repeated one after another.

Here, the multiple feed prevention effect of the guide plate 31 will be explained in detail. Due to the friction between the stacked paper sheets 12, the topmost paper sheet 12a is fed by the feeding force of the paper feed belt 21.
In addition, a plurality of sheets 2 may be fed to the guide plate 31 portion.

Here, the frictional force in the feeding direction acting between the paper feed belt 21 and the uppermost sheet 12a is F, and the friction coefficient between them is μm.
, where P is the pressing force of the paper feed belt 21, there is a relationship of F=μmP. In addition, the conveying force exerted by friction from the topmost sheet 12a on the sheets 12b, c, . Then, there is a relationship of f□=fyo=μ2P. If this frictional force fLv fop... is larger than the conveyance drag force, the second and subsequent sheets 12b, c,...
will be multiple-fed along with the uppermost sheet 12a. Paper sheets 12a, b, c fed multiple times in this way
.

... come into contact with the guide plate 31, and are further moved by the conveying force applied from the paper feed belt 21 to the top portions 31a, b.
trying to overcome. At this time, as shown in FIGS. 3 and 4, the paper sheets 12a, b, 8? ... is the top portion 31a,
b and the lower surface of the paper feed belt 21, and as a reaction force due to this deformation, each paper sheet 12a, b, c,...
An approach resistance force ΔR in the opposite direction to the conveyance force acts on . In order to overcome this entry resistance force ΔR and allow only the top sheet 12a to pass through the guide plate 31, a linear equation only needs to hold.

ΔRAP (μ, −μ2) ・・・・・・(
1) That is, assuming that the second sheet 12b is stopped, the frictional force F acting between the sheet 12a and the paper feed belt 21
From this, one leaf 12a and 12b acts as a conveying resistance force.
The condition is that the value obtained by subtracting the frictional force between them is greater than the approach resistance force ΔR. On the other hand, the second and subsequent sheets 12b and c
In order for the paper sheets 12b to pass over the guide plate 31, the conveyance force applied to each paper sheet must be greater than the above ΔR.
, c, . . . , because there is a friction coefficient μ2 between each sheet,
This value is sufficiently smaller than the conveying force acting on the Therefore, by setting ΔR to an appropriate value, only the uppermost sheet 12a can be separated and fed. The adjustment of this approach resistance force ΔR is carried out by the amount of engagement δ
This can be done by changing the size of the gap between the paper feed belt 21 and the top portions 31a and 31b. That is, increasing δ increases ΔR, and decreasing L also increases ΔR. These adjustments are determined with consideration given to not damaging the paper sheet 12.

As described above, according to this embodiment, multiple feeding can be prevented, and since the paper feed belt 21 and the guide plate 31 are made non-contact, their wear can be prevented.

Furthermore, since the contact force between the paper sheet 12 and the guide plate 31 is weak, generation of paper dust can also be reduced.

In addition, since the guide plate 31 of this embodiment is provided with its guide surface inclined in the paper feeding direction, the uppermost sheet
2a is smoothly passed over the guide plate 31 and sent out.

In addition, two or more sheets 12 may be mistakenly placed on the guide plate 3.
1, they are sent out over separation roller 3
4 and the paper feed belt 21. As a result, a force greater than the set load is applied to the separation roller 34, and the torque limiter 38 operates to stop the rotation of the separation roller 34, thereby preventing the delivery of sheets 12b, etc. other than the uppermost sheet 12a. It has become.

〔Effect of the invention〕

According to the present invention, since the top of the guide plate is arranged at a distance on the open side of the paper feed belt that conveys paper sheets, the guide plate and the lower surface of the paper feed belt do not come into contact with each other. can prevent wear.

In addition, the lower surface of the paper feed belt and the ridge line connecting the top of the guide plate are interlaced to deform the paper products, and the resulting resistance force separates the topmost sheet from the next sheet. Therefore, due to the difference in the coefficient of friction between the paper sheets in the upper and lower positions, separation is reliably performed, and multiple feeding can be prevented.

When the upper sheet passes through the top of the guide plate, the sheet feed belt immediately contacts the next sheet, so the sheet feed belt can feed the sheet without interruption.
In other words, paper is fed without impairing the separation cycle.

During this paper feeding, since the contact between the paper sheets and the guide plate is weak, the generation of paper dust can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an embodiment of a paper feeding device according to the present invention;
Figure 2 is a side view of the embodiment shown in Figure 1, and Figure 3 is a side view of the embodiment shown in Figure 1.
FIG. 4, which is a rear view of the embodiment shown in the figure, is an explanatory diagram of the operation of this embodiment. 1o... Placement table part, 11... Placement table, 12... Paper leaf, 12a... Uppermost paper leaf, 13... Side plate, 20...
...Paper feed section, 21...Paper feed belt, 22...Followed roller, 23...Pulley 24...Timing belt, 25...Shaft, 26...1-motor, 30...・
Multiple feed prevention section, 31... Guide plate, 32...
- Axis, 33...conveyance roller. 34... Separation roller, 35a, b... Gear, 36.
... Link, 37 ... Shaft, 38 ... Torque limiter, 39 ... Spring, 40 ... Conveyance section, 41 ... Drive roller, 42 ... Followed roller, 43 ... Shaft, 44・
...Shaft, 45... Machine frame side plate, 46... Drive motor. Figure 1

Claims (1)

[Claims] 1. A mounting table on which a plurality of paper sheets are placed in a stacked manner, and an endless plate placed in contact with the uppermost sheet of this mounting table and driven to rotate in a fixed direction. The paper feed belt includes a paper feed belt and a guide plate disposed at a position where the leading edge of the paper sheet fed by the paper feed belt comes into contact with the paper feed belt, and the guide plates are provided at intervals on both sides of the paper feed belt. 1. A sheet feeding device, characterized in that the line segment connecting the ridges of the top portion is provided at a position that is narrower than the lower surface of the sheet feeding belt by a predetermined dimension on the sheet feeding belt side. 2. The paper feeding device according to claim 1, wherein the guide plate surface against which the leading edge of the paper sheet comes into contact is inclined in the feeding direction of the lower surface of the paper feeding belt. 3. A conveyance resistance force ΔR caused by the deformation of the paper sheet when climbing over the top of the guide plate, and a pressing force P of the paper feed belt in contact with the uppermost paper sheet;
Friction coefficient μ_1 between this paper feed belt and the uppermost paper sheet
and the coefficient of friction μ_2 between the top paper sheet and the next paper product that comes into contact with it, the relationship ΔR<P(μ_1−μ_2) is established. Or the paper feeding device according to paragraph 2.