JPS6160190A - Paper sheet floating-prevention mechanism - Google Patents

Abstract

PURPOSE:To feed paper sheets of various sizes and small thickness with no skew by setting the centroid point of a pressure guide on the same axial line of the conveying direction as the center point of a pickup roller and using said guide plate. CONSTITUTION:A centroid point H of a pressure guide plate 19 is set on the same axial line of the conveying direction of paper sheets as the center point I of a pickup roller 13. Then the load of the empty weight is applied onto the surface of the paper sheet to prevent the floating state of the sheet. For this purpose, the plate 19 is used. Thus the rotational moment M is not produced to the paper sheet 11. The roller 13 and pressure guide plates 17 and 19 have contacts with the surface of the sheet 11 and are attached to a guide plate 16 so that they can freely moved toward and arrow head C. Both plates 17 and 19 prevented with their empty weight the sheet 11 from floating up at a place near the plate 16 which is pressed by the moment M in case the sheet 11 has a large size. This role is left to the plate 19 as the size of the sheet 11 is reduced.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a mechanism for preventing paper sheets from floating, and in particular, a mechanism for preventing paper sheets from floating that is suitable for conveying stacked thin sheets without skewing them. It is about the mechanism.

[Background of the invention]

Conventionally, the conveyance of paper sheets to the paper feed section of an optical character reader (OCR), etc. has been carried out on the right (or
The pickup roller 3 on the left side of the paper rotates in the direction of arrow B to send out the paper sheet 1, and the drive roller 5 further conveys it in the direction of arrow A. In the above conveyance mechanism, when the paper sheet 1 receives the sending force (F) of the pickup roller 3 as shown in FIG.
) around rotation moment) (M-(=-3)F), the part in contact with the guide plate 6 floats up, reducing the guiding effect of the guide plate 6 and causing the paper sheet 1 to It suffered from skew and damage to the side bands. As a countermeasure, an upper surface (presser) plate and rollers are attached to the guide plate 6 in a state where it can move up and down, that is, in a state where its own weight is applied to the surface of the paper (Japan Institute of Invention and Innovation Public Technical Report, Public Technical No. 82-34
9. VoL7-2 "Form transport mechanism of optical character reader",
Japanese Unexamined Patent Publication No. 57-97183 "Mechanism for preventing floating of forms"
, JP-A-57-10Q578 ``Mechanism for preventing floating of forms'').

However, in the case of the above-mentioned upper surface (presser) plate, the paper sheet 1
As the shape of the press plate 7 becomes smaller, as shown in FIG. 4, the holding plate 7 becomes diagonal from the horizontal position, and one consideration is missing.

[Purpose of the invention]

The object of the present invention is to eliminate such conventional drawbacks and to provide a paper sheet flotation system that can feed paper sheets from dog to small size and thin paper sheets without skewing the paper sheets by a simple and inexpensive method. The purpose of the present invention is to provide a mechanism for preventing damage.

[□Summary of the invention]

In order to achieve the above object, the paper leaf floating prevention mechanism of the present invention is equipped with a pick-up roller for feeding one paper leaf to the right or "left 1" paper surface, and the accumulated paper leaf is transferred to the conveyance path. In the sheet transport mechanism that feeds paper, a center of gravity (I) is located on the same axis in the transport direction as the center point (I) of the pickup roller.
H) is placed, and a presser guide plate is provided which applies a load due to its own weight to the surface of the paper sheet to prevent the paper sheet from floating up.

[Embodiments of the invention] Embodiments of the present invention will be described below with reference to the drawings.

, FIG. 1 is a schematic perspective view of a sheet floating prevention mechanism showing one embodiment of the present invention, and FIGS. 5 and 6 are diagrams for explaining the configuration of FIG. 1'.

In Figures 1, 5, and 6, 11 is a paper leaf, 11b
is a small paper sheet, 13 is a pickup roller, 15
16 is a drive roller, 16 is a guide plate, 17 to 19 are presser guide plates, and 2o is a bottom plate.

FIG. 5 shows a state in which a small paper sheet 11b of A8 size is sent out by 130 rotations of the pickup roller while the presser guide plates 17 and 18 are used to prevent floating.

The position of the center point (, I) of the pickup roller 13 is shown by dimensions ``a'' and 6, G is the center of gravity of the paper sheet 11b, and I4 is the position of the presser guide plate 18 which is separated from the guide plate 16 by the distance d. is the center of gravity of

The paper sheet 11b is fed by the force (F
), a resistance force is generated between the center of gravity (G) of the sheet 11b and the center of gravity (H) of the presser guide plate 18, and at the same time, a rotational moment is generated. In addition, in terms of the load on the paper surface, since the center of gravity point σ-■ of the pusher guide plate 18 is larger than the center of gravity point (G) of the thin and small paper sheet 11b, the resistance of the center of gravity point (H) is larger. “Drag force (f) and rotational moment (M)
Illustrated. Also, the rotational moment in the same figure) (i
) arrow indicates □ if a>6 dimensions, but in the case of a2d, M'='Q, and conversely, in the case of a'(d, ', the rotational moment ( M) occurs.

FIG. 6 shows a situation in which dimensions 8 and 6 in FIG. 5 are made equal, that is, when dimensions ◯ and H are placed on the same axis in the sheet conveyance direction. Place the presser guide plate 19 at a'-d□
Therefore, the shape of the presser guide plate 18 in Fig. 5 was changed.
It is something. Therefore, in this case where the center point (1) of the pickup roller 13 and the center of gravity (H) of the presser guide plate 19 are coaxial, the rotation "movement" with respect to the sheet 11i)
(M) does not occur, so there is no skew. Note that the weight of the presser guide plate 19 (load on the paper surface) is determined in correlation with the force (F) that the pickup roller 13 sends out. The paper leaf floating prevention mechanism shown in Fig.
This is a structure that incorporates 2b). Pick up roller 1
3 and the presser guide plate 1'7.19 are in surface contact with the sheet 11 and have a structure that allows them to move freely in the direction of arrow C.
Install it on 6. A structure may be adopted in which the vertical movements of the above three members are connected. CM
), the sheet of paper near the guide plate 16 that is pressed by
becomes larger. In addition, since the presser guide plates 17, 1'9 are in surface contact with the paper sheets 11, the paper sheets 11, 11, 11, 11, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 1,, 11,, 11, 11,,11,11,,10,100-100, 100, 10, 10, 10, 12, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, , 1, , 1, 1, , 1, , 1 0, 1, , 1, , 9, 1, , 9, and 1 ’9, and the paper sheets 11, 11;
Even if 50 kg paper □ is used, no skew will occur.

The drive roller 15 further conveys the sheet 11 sent out by the pickup roller 13 in the direction of arrow A. The bottom plate 20 is connected to the pickup roller 13, which has been lowered after sending out 5 to 6 sheets 1'l, for example. is detected, and the descended amount is raised (arrow D) together with the accumulated paper sheets 11.However, the position detection of the pickup roller 13 and the elevator mechanism of the bottom plate 20 are not shown, but are generally used. Any mechanism that has one is fine.

In this way, in order to prevent the sheet 11 from floating, the presser guide plate 17 and the center point (I) of the pickup roller 13 are
Since the presser guide plate 19 has its center of gravity (H) at the position where the axes in the conveying direction match, it is possible to convey thin paper sheets and various kinds of paper sheets from dog to small size without skewing them. It is. Furthermore, the reliability of the device is improved and the work efficiency is improved.

〔Effect of the invention〕

As explained above, according to the present invention, the accumulated paper sheets are guided in the conveyance direction by the two guide plates that are in surface contact with the paper sheets while preventing them from floating due to rotational moment. Thin paper sheets and various paper sheets from dog to small size can be fed reliably without skew.

Brief explanation of the previous aspects Fig. 1 is a schematic perspective view of a paper sheet floating prevention mechanism showing an embodiment of the present invention, Fig. 2 is a schematic perspective view of a conventional paper sheet transport mechanism, and Fig. 3 is a rotation A diagram to explain the generation of moments,
Figure 4 is a schematic perspective view of a conventional paper leaf floating prevention mechanism, Figure 5
6 are diagrams for explaining the configuration contents of FIG. 1.

1, la, lb, 11. llb: paper sheet, 3, 13: pickup roller, 5, 15: drive roller, 6.16: guard plate, 7: presser plate, 17-19: presser guide plate, 20
:Bottom plate.

Figure 3 F Figure 5 Figure 4 Figure 6

Claims (1)

[Claims] In a sheet conveyance mechanism that is equipped with a pickup roller on the right or left end sheet surface for feeding out the sheet and feeds accumulated sheets to a conveyance path, the center point of the pickup roller and the same axis in the conveyance direction are provided. A mechanism for preventing floating of paper sheets, characterized in that a presser guide plate is provided, the center of gravity of which is placed on a line, and a weight is applied to the surface of the paper sheet by its own weight to prevent the floating of the paper sheets.