JPS5811763Y2 - Paper sheet conveyance device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a paper sheet conveying device that conveys paper sheets by sandwiching them between rollers such as pulleys or rollers arranged in an arrangement and a belt.

i-L printing 4, printer, copy machine, 77x,
As shown in FIG. 1A, a conveying device used for transporting paper such as an optical reader has a paper 9 sandwiched between two belts 1, 1 or rollers arranged with wires. Alternatively, as shown in Fig. 1B, a rotating belt 1 is circumscribed with a steel ball 2, and the paper is transferred while being sandwiched between the steel ball 2 and the belt 1. It is being

In FIG. 1B, the steel ball 2 on the carry-in side is provided with a compression spring 3 in order to sufficiently catch paper.

However, the conveyance structure shown in Figure 1A, which uses belts or wires and pulleys, works well when placed horizontally, but when conveyed vertically or diagonally, the paper being conveyed may slip off or fall diagonally. Therefore, it is necessary to provide a paper guide along the belt, which makes the device structure complicated and has disadvantages in terms of manufacturing, maintenance, etc.

On the other hand, the conveyance structure using steel balls and a belt shown in Fig. 1B works well during horizontal conveyance, but when conveyed vertically, the friction of the steel balls increases, making it impossible to convey sheets smoothly. 1 Contrary to the case in Figure A, belt 1
It is structurally impossible to transport paper products by circumscribing steel balls on the underside of the paper.

In addition, there are other conveyance structures in which belts are arranged side by side and paper sheets are sandwiched between the belts. There is a problem.

FIG. 2 is an explanatory diagram of another conventional conveyance device that eliminates conveyance troubles by using pulleys with different radii. The belt 7 is the driving source, and the pulleys 5 and 6 are the driven sides.

The radius r of pulley 5 and the radius r' of pulley 6 are r > r
'(7) Being in a relationship.

Here, the arc length of each contact part of pulleys 5 and 6 at the belt center is (△Sct) t ("S'c 1
), the arc length of the center line contact part of paper 9 is (4SC2) t
(Δs'c2), if ΔS'c is ΔSc1, then there is a relationship of ΔS'c2<ΔS c 2 .

Therefore, during a certain time T, the center line of the belt 7 becomes (△Sc
If the center line of the paper is moved by ΔSc2 on the pulley 5 side, a force is applied from the conveyor belt 7, and a force is applied on the pulley 6 side to advance it by ΔS'c2.

Therefore, if paper 9 is sandwiched between pulleys 5, 6 and conveyor belt 1 and transported in the direction of arrow 8 in FIG. When the paper 9 moves in the direction 8', the arm of the paper 9 bends as shown in FIG.
This causes problems such as jams, creases, etc. in the paper 9.

Therefore, the paper 9 must be transported from the pulley 6 to the pulley 5 side (in the direction of arrow 8) as shown in FIG. 2, and there are restrictions on the transport direction, and pulleys with different radii must be used. I had to.

The purpose of the present invention is to provide an improved conveying device in order to solve the problems in the conventional conveying devices as described above, and the paper industry Conveying devices with a structure that pinch and transfer paper sheets can smoothly transfer paper sheets without causing undulation in any direction of conveyance, especially in vertical or inclined directions. To provide a highly reliable paper sheet conveyance device suitable for high-speed conveyance that can be miniaturized with a minimum number of parts and use common parts without preventing the operation of optical reading heads, neat printers, etc. It is.

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

FIG. 4 is an explanatory diagram of the basic concept of a conveying device according to an embodiment of the present invention, in which pulleys of the same radius are used, and the pulleys are arranged at intervals shorter than the length of the conveyed paper sheets.

Boo with the same radius as in this example! Using JI0,10' is excellent in terms of mass productivity.

Of course, the conveyor belt 7 is made of a material that is highly flexible, very easy to conform to, and has no rigidity against bending.

The contact angle between the pulleys 10, 10 and the belt 7 is set to θ1. θ
2, in the transport direction of the arrow 8, if θ1 is 0°, the paper 9 will be curved as in FIG. 3, and if θ1>θ2, the paper 9 will be wavy as in the case of FIG. Can be transported without causing any damage.

Considering this in the same way as the example of the prior art shown in FIG. A force is also applied to the conveyor belt 7 to move it forward by ΔSc2.

Therefore, boo! Since JIG and 10' have the same diameter, △
5c1-ΔS'c1, the amount of movement of the inner side (pulley side) of the conveyor belt 7 is ΔSc3. △S'c3, if the center movement amount of paper T is △5c2)△S'c2, then △Sc32△
Sc3 △Sc2: △Sc2 △Sc1>△Sc3>>△Sc2.

The reason why the waving (curving) phenomenon of the paper sheets 7 can be prevented under these conditions is because the conveyor belt 7 is not so strong! JI0,10'
Paper pressing force F.

F is the contact force F between the paper 9 and the conveyor belt 7.

This is thought to be due to the fact that there is a difference between F' and F<F'.

In other words, although belt members are generally flexible,
No matter how thin the member is, there is resistance to bending, and the greater the belt pressing force, the more closely the belt adheres to the pulley's outer circumference, but the smaller the belt, the less closely the belt adheres to the pulley's outer circumference, making it appear as if it were in contact with a pulley with a larger radius. This is thought to be due to the increased bending curvature of the belt.

Therefore, the goo in Figure 4! 710 and 10' have the same diameter, but the actual radius of curvature of the belt is wider on the pulley 10 side than on the pulley 10' side, which is the same form as when paper is conveyed in the direction of arrow 8 in FIG. It is thought that it has become .

Note that it is clear that the magnitude of the belt pressing forces F and F' becomes F'>F when θ1>θ2 if the belt tension is uniform.

FIG. 5 is an explanatory diagram showing an embodiment of the paper sheet conveying device of the present invention based on the above basic concept.

In FIG. 5, pulleys 10-1 to 10-5 have the same radius and have a contact angle of θ1. θ2. θ
3. θ4. They are arranged so that θ5 becomes θ1>θ2>θ3>θ4>θ5.

As a result, the pulleys 10-1 to 10-5 have a generally arcuate arrangement, that is, an arrangement similar to that of an egg divided into two along its long axis.

The radius of curvature of the paper at each pulley 10-1 to 10-5 increases as the contact angle θ becomes smaller.
The situation is similar to that in which the radius of 0-5 gradually increases, and the function is the same as in the case of FIG. 2.

Here, since the contact surface between the belt 1 and the pulleys 10-1 to 10-5 gradually becomes smaller, it is not possible to change the conveyance direction significantly as it is.

Therefore, for pulleys 10-1 to 10-5, θi-1>
Pulleys 10-6 and 10 are arranged based on the basic curve of the present invention called θi, and the conveying direction changes greatly.
The buffer section can be explained between -5 and 5.

Between the pulleys 10-5 and 10-6, the contact angle is θ
Since the relationship is 6>θ5, there is a risk that the paper will be curved as shown by the broken line 9'.

Therefore, the guide member 11 is arranged facing the belt surface,
The arms of the paper are restrained from bending outward, and the paper is sandwiched between the pulleys 10-6.

The pulleys 10-6 and 10-7 following this buffer section are arranged in a pulley manner with the relationship θ6>θ7.

In addition, an optical reading head 12 is installed between Boo'J 10-1 and 10-2, and Boo'J is installed between 10-1 and 10-2. 710-2 and 10-
A printer head 13 is installed between the sheets of paper, but when installing the printer head, a platen must be installed below the paper.

Therefore, as shown in FIG. 6, the platen 14 is provided to face the printer head, sandwiching the parallel conveyance section of the pulleys 10-2 and 10-3, and the belt 7 is attached to the lower side of the platen 14 by a guide pulley 15 so that the tension is not lost. Transfer without any trouble.

As a result, the paper 9 is transferred between the printer head 13 and the platen 14.
The desired printing can be performed.

As explained above, the present invention has a conveying device composed of pulleys with the same radius, which contributes to its mass productivity.The conveying direction can be adapted to all conditions such as horizontal, vertical, and reverse horizontal, and it is relatively long. Conveyance and input can be solved by interposing a buffer section, and at the same time, optical reading heads, needle printers, etc. can be installed on the conveyance line as necessary, making it possible to read and print paper sheets. Since no special guide member other than the buffer part is required, the number of parts can be reduced and the size can be reduced. At the same time, the bending moment applied to the pulley is small, so the pulley shaft can be made thinner, and it is also easier to handle paper sheets. The design can be changed arbitrarily according to the size of the belt without sacrificing functionality, which not only extends the life of the belt used, but also realizes a highly reliable conveyance device suitable for high-speed conveyance.

[Brief explanation of the drawing]

Figures 1A and B, Figures 2 and 3 are explanatory diagrams showing an example of the structure of a conventional conveying device; Figure 4 is an explanatory diagram for explaining the basic concept of the present invention; FIG. 6 is an explanatory diagram showing one embodiment of the invention, and FIG. 6 is an explanatory diagram showing a specific example of the vicinity of the printer bed in FIG. 5. 1.1 (...Belt, 2...Steel ball, 3...Compression spring, 5,6...
...Pulleys with different diameters, 7...Transport belt, 8...
...Arrow indicating the transport direction, 9...Paper (sheets), 10,10/-...Pulley of the same diameter, 11.
... Guide member, 12 ... Optical reading head, 13 ... Printer head, 14 ...
・Platen 15...Guide pulley.

Claims (1)

[Scope of Claim for Utility Model Registration] In a paper sheet conveying device in which a conveyor belt is circumscribed around arranged rollers, rollers having the same diameter are arranged in a substantially arc shape at intervals shorter than the length of the paper to be conveyed. It is characterized by having a conveyance structure in which the paper is interposed between a conveyor belt and a roller, and the contact angle between the circumscribed conveyor belt and the roller is gradually reduced in the direction in which the paper sheets travel. Paper sheet conveyance device.