JPH0324510Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a method of stacking and aligning copy paper, postcards, banknotes, various cards, and other paper sheets into one
The present invention relates to a paper feeding device for various paper sheet processing machines that separates and feeds sheets one by one and performs processing such as copying, printing, counting, and discrimination.

Conventionally, in this type of paper feeding device, in order to reliably separate and feed paper sheets one by one from the paper sheet storage section, a gate opening is provided with a paper feed roller that faces the paper feed roller to feed the second and subsequent sheets. Separation means are provided which consist of separation rollers which prevent the passage of leaves and avoid double feeding.

However, while processing a large amount of paper sheets, there was a problem in that due to variations in the type and thickness of the paper sheets being handled, the accurate separation function could not be achieved and double feeding would often occur.

The present invention has been developed in view of the above, and includes a new mechanism that prevents the second and subsequent sheets when they are not separated by the separating means and is fed in duplicate, and returns them in the opposite direction. Additionally, the main object of the present invention is to provide a paper feeding device that can reliably feed one sheet at a time.

The present invention will be explained below with reference to embodiments shown in the drawings.

FIG. 1 shows an embodiment of the paper feeding device according to the present invention, which includes a paper sheet storage section 2 in which a group of stacked and aligned paper sheets is placed and stored, and a paper sheet storage section 2 provided at the gate opening of this storage section 2. A separating means includes a paper feeding roller 3 and a separating roller 4 for separating and feeding the separated paper sheets 1 one by one, and a separating means that comes into contact with the paper sheets 1 sent out from the separating means, and separates the paper sheets 1. It consists of a blocking roller 5 which is rotated in the opposite direction in a direction to block paper feeding only when sheets 1 and 1 are fed in duplicate.

Further, the paper feed roller 3 includes a first roller 6 having a friction member 8 made of rubber or the like on a part of its outer circumference facing the separation roller 4, and a first roller 6 having a friction member 8 made of rubber or the like that faces the blocking roller 5 over its entire circumference. It consists of a second roller 7 having a friction member, but the second roller 7 can also serve as the second roller 7.
By providing a new roller that faces the second roller 7 and rotates in the same direction as the second roller 7, this paper feed roller 3
can also be composed of only the first roller 6.

Furthermore, as shown in FIG.
A friction plate 12 is rotated in a direction to prevent the paper sheet 1 from being fed through a timing pulley 13 using a timing pulley 13, and a friction plate 12 is pressed against the friction plate 12 by a spring 10. A sliding mechanism 9 consisting of a friction plate 11 that is movably supported and whose rotational movement relative to the rotating shaft 15 is prevented by a sliding pawl 15a provided on the rotating shaft 15.
It is connected to this friction plate 11 via a rotating shaft 15,
Normally, as shown in FIGS. 3a and 3b, the two friction plates 1 of the sliding mechanism 9 are
1 and 12 are rotated in the direction in which paper is fed without receiving the rotational force of the sliding friction plate 12, and the separation roller 4
The paper sheet 1 is smoothly rolled between the roller and the blocking roller 5 without any bending, wrinkles, creases, etc.
On the other hand, in the case of double feeding of paper sheets and being fed by the separating means as shown in Fig. 3c, the frictional force acting between the paper sheets 1 is caused by the friction between the roller and the paper sheets. Since the rotational force acting on the blocking roller is very small compared to the frictional force generated between The plate 11 receives rotation transmission through the friction plate 12, and the blocking roller 5 reversely rotates in the direction of blocking paper feeding, and prevents the feeding of the second and subsequent paper sheets 1. In order to return the second and subsequent paper sheets 1, double feeding of the second and subsequent paper sheets 1 is reliably prevented without bending or wrinkles or creases on the paper sheets 1. Spring 10 so that you can
The pressing force of is adjusted.

In the above embodiment, a friction clutch-type sliding mechanism is illustrated as an example of the sliding mechanism, but the present invention is not limited to this, and the present invention is not limited to this. It is also possible to incorporate double feed detection by another means, for example, separating roller 4 and blocking roller 5.
It is also possible to provide means for detecting variations in the thickness of the paper sheet 1 between the rollers 1 and 1, and to use this means to transmit reverse rotation to the blocking roller 5. Furthermore,
The separation roller 4 is always rotated in the direction that prevents paper feeding, but in cases where the separation roller 4 is fixed or only allowed to rotate in the direction that prevents paper feeding, the rotation of the blocking roller 5 is controlled by an encoder. The present invention can also be carried out by detecting the power transmission using, for example, a power transmission system, and connecting and rotating another power transmission system only at that time.

Since the paper feeding device according to the present invention has the above-described structure, the separating means reliably performs the separating function, and when feeding sheets one by one, the paper sheets are smoothly fed without the blocking function of the blocking roller. However, when the separating means cannot separate the sheets and double-feeds the sheets, this blocking roller rotates in the opposite direction to prevent the sheet from being fed, and together with the separating roller, the sheets are separated into two sheets. In order to prevent double feeding of paper sheets after the first one, it is possible to reliably feed one sheet at a time.

As described above, according to the present invention, in addition to the separating means, this separating means also detects double-fed sheets that cannot be separated, and prevents the feeding of the second and subsequent double-fed sheets. Because of the provision of a blocking roller, the rate of double feeding of paper sheets is much lower than that of conventional paper feeding devices, which has the excellent effect of ensuring smooth and reliable paper feeding, and also preventing double feeding of two sheets. Since the paper sheets after the second row are rotated together with the separation roller in the direction of blocking paper feeding, the blocked paper sheets do not bend and there is no fear of wrinkles or creases.

[Brief explanation of the drawing]

Figure 1 is a side view of the main parts of the paper feeding device of the present invention;
The figure is a sectional view of a main part for explaining the operation of the blocking roller in FIG. 1, and FIG. 3 is a schematic side view for explaining the rotating state of the blocking roller. In the figure, 1... Paper sheets, 3... Paper feed roller, 4...
...separation roller, 5...blocking roller.

Claims (1)

[Claims for Utility Model Registration] In a paper feeding device that separates and feeds paper sheets stacked in a storage section one by one, a predetermined range of the circumference is in contact with the paper sheets sent out from the storage section. A first roller that becomes a friction material, and a second roller that is also in contact with the paper sheet and whose entire circumference is covered with the friction material are fixedly arranged coaxially and rotate in the paper feeding direction. A paper feed roller configured as above and a comb-shaped unevenness that is in sliding contact with the first roller or not in contact with each other, and is provided so that paper sheets can be held between the first roller and the first roller. , a separation roller that rotates in a direction to return the paper sheets to the upstream side of the feeding side, and the first roller of the paper feed roller and the separation roller constitute a paper sheet separation means. , is provided at a distance on the paper sheet feeding downstream side of the separation roller, and is in pressure contact with the second roller of the paper feed roller, and when double fed paper sheets enter the part that is in pressure contact with the second roller, A paper feeding device characterized by being provided with a blocking roller that rotates in a direction to return multi-fed sheets to the upstream side.