JPS61178344A - Paper feeder - Google Patents

Abstract

PURPOSE:To enable a paper feeder to surely feed a paper even when the papers are stacked in a fan shape state in a hopper by independently providing two separate pusher rollers so as to be able to rotate about a bicker roller shaft to enable the hopper to carry a large number of papers. CONSTITUTION:Papers in a hopper independently rotates two pusher rollers 1 and 2 about the shaft of a bicker roller 5 through levers 13 and 14 and arms 3 and 4 as the hopper is raised. When a light beam 16 of a photoelectric transducer 15 is interrupted by the levers 13 and 14, the ascent of the hopper is stopped. Then the pusher rollers 1 and 2 driven for rotation in synchronism with the bicker roller 5 supply the uppermost paper one by one to a pair of pinch rollers 18 and 19 through a duplex feed prevention mechanism comprising the bicker roller 5 and a reverse roller 17, feeding the paper to the subsequent process.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to an automatic paper sheet processing device, and in particular to an OCR device that optically reads and processes information written on paper sheets. This invention relates to a friction-type sheet feeding device for rapidly feeding sheets one by one from a group of sheets.

[Conventional technology]

Conventionally, this type of paper feeding device has a pusher part that loads a group of sheets to be processed, and a pusher that is placed in contact with the stacked sheets and feeds the topmost sheet of the group one by one. a picker roller that is driven to rotate in the forward direction of the paper feeding force in synchronization with the pusher roller, and a reverse roller that is placed in opposing pressure contact with the picker roller and is driven to rotate in the opposite direction to the paper feeding direction. The paper is fed to the processing device by a multi-feed prevention mechanism, and a pinch roller, which consists of two rollers that face each other and are driven to rotate in the forward direction. Ta.

[Problem that the invention attempts to solve]

In the conventional paper feeding device described above, since the pusher roller is composed of one roller, when a large amount of paper sheets are stacked on one part of the hopper, the paper sheets are not piled up in an orderly manner. In OCR equipment, for the security of processing a large amount of information at high speed, a large amount of paper sheets of different sizes and qualities, such as 9, half-folded paper sheets, and paper sheets with perforations, are stored in the hopper. If a large amount of these sheets is loaded in one part of the hopper, the sheets will be stacked in a fan shape, and as a result, the pulp shear roller will hit the sheets unevenly. As a result, there are disadvantages such as a decrease in the feeding force, the occurrence of a skew in which sheets are fed diagonally, and the inability to load a large amount of sheets into a portion of the hopper.

゛Also, the pickler and reverse roller are facing each other,
Because they are in pressure contact, when processing sheets of different paper thickness and paper quality, in order to ensure accurate sheet feeding, the pressure contact force is adjusted according to the difference in the friction coefficient between the sheets depending on the difference in paper thickness and paper quality. There are some downsides that make it easier to adjust.

[Means for solving problems]

The paper feeding device of the present invention comprises: (a) two units that can independently abut on each other depending on the position of the uppermost paper surface of the paper stacked in a part of the hopper, and that are rotationally driven in synchronization with each other by VC; and (b) are not in equal pressure contact with the picker roller, and are located downstream of the picker roller, which is embedded in the picker roller side, rather than the sheet conveyance path that connects the picker roller surface and the grit shear roller surface. [Actual example] Next, the present invention will be explained with reference to the drawings. Figure 1 shows one embodiment of the present invention. A perspective view of an example of 0 Gunyarora 1
．． The pusher rollers 2 each have an arm 3. An endless belt linked to the shaft end of the picker roller 5 via the arm 4 and further hung between a 7''-96 fixed to the shaft end of the fisher roller 10 and a pulley 8 fixed to the shaft end of the picker roller 5. 10, the pusher roller 1 is rotationally driven in the direction of the arrow in synchronization with the picker roller 5.

Similarly, the pusher roller 2 is moved in the direction of the arrow in synchronization with the picker roller 5 by an endless belt 11 that is hung between the goreif fixed to the shaft end of the pusher roller and the pulley 9 fixed to the shaft end of the picker roller 5. Rotationally driven.

A lever 13 is provided at the end of the arm 3, which can independently rotate both the 7" rasher rollers 1 and 2 in the direction of arrow 12 around the axis of the picker roller 5. A lever 14 is provided at the end of the arm 4. Historically, part of each lever is the position of the lever, that is, the position of each lever.

A pair of photoelectric conversion elements 15 are provided for detecting the position of the yellow roller, and when each lever is rotated, the light beam 16 of the photoelectric conversion element is transmitted. The output of the photoelectric conversion element is connected to a 1ttll-circuit (not shown), and the picker roller 5 is rotationally driven in the direction of the arrow by a rotational drive device (not shown). A reverse roller 17 is arranged at a position facing the picker roller 5.
It is rotated in the opposite direction by a rotational drive device (not shown).

Pinch rollers 18 and 19 are brought into contact with each other at the same pressure and are rotated in the direction of the arrow by a drive device (not shown).

The surfaces of the pusher roller 1.2 and the picker roller 5 are
The surface of the reverse roller 170 is made of an elastic body (for example, made of soft wax rubber) that exerts a light frictional force on the sheets to be fed, and the surface of the reverse roller 170 is stronger than that of the pusher roller 1.2 and the picker roller 5. 0 where 1,7 is formed of an elastic body with low frictional force (for example, foamed foam, etc.)
The am coefficient between the surface material of the roller roller 1.2 and the picker roller 5 and the paper sheet is μm, the friction coefficient between the surface material of the reverse roller 17 and the paper sheet is μ20, and the friction coefficient between the sheets is μ3.
Then, the surface material is selected so that the relationship μl>μ2>μ3 holds.The driving force of the picker roller 18, 19 is pressed so that it is sufficiently stronger than the driving force of the picker roller 5 and reverse roller 17. Force and surface friction material are selected 0 or pusher roller 1.2. Pickarola 5. The width of each roller of the reverse roller 17 is set to a size that can sufficiently cover even the smallest width paper sheets to be processed.0 Figure 2 is a plan view showing the operating state of the present invention, and number 1-19 is the same as Figure 1. 020 is a paper sheet to be fed and is stacked on the hopper 21. The hopper 21 is driven six times back and forth in the direction of an arrow 21 by a drive device (not shown). Normally, the hopper 21Fi is controlled to move to the lowest position 7 and then stop when paper feeding is completed. 23 is a kite grate for guiding paper sheets. Here, feed the paper @
When paper sheets are loaded into the hopper 21 and the device is driven, the hopper 21 first rises, the paper sheets 20 push up the sticky roller, and if the levers 13 and 14 do not block the light beam 16 of the photoelectric conversion element 15, the hopper 21 rises. stops and pickerola 5
．． Pusher roller 1.2. Reverse roller 17. The pinch rollers 18 and 19 are rotated and paper feeding begins. Slimy roller l. 2 feeds the uppermost sheet of sheets 20 to a multiple feeding prevention mechanism composed of a picker roller 5 and a reverse row 217. If only one sheet of paper is fed, the picker roller 5 and the sticky roller 1.2 are used as described above.
Because the friction coefficient of the front printing material is set to be much smaller than that of the reverse roller 17, the paper ``#'' passes through the multiple feed prevention mechanism, is pinched by the pinch rollers 18 and 19, and is sent to the next processing step. If there are two or more sheets fed in, the topmost sheet will pass through, but for the second and subsequent sheets, the friction coefficient is set so that μl〉μl〉μ3 as described above. In addition, the roller surface position of the reverse roller 17 is located closer to the picker roller 5 than the sheet conveyance path formed by the line connecting the roller surfaces of the pusher roller 1.2 and the picker roller 5. It protrudes to the side and is located downstream of the paper sheet conveyance path with respect to the picker roller 5.
In addition, since it does not come into pressure contact with the surface of the picker roller 50 and has an appropriate gap, the leading edge of the paper sheet fed into the multiple feed prevention mechanism is squeezed, further improving the effect of separating two sheets. ing. Roughly, since the reverse roller 17 and the picker roller 5 are not in pressure contact with each other, the single track on the surface of each roller is minute and a long-term stable multiple feed prevention mechanism can be realized.

The number of sheets stacked on the hopper 21 is reduced by being fed, and when the crusher roller 1.2 descends, the light beam 16 of the photoelectric conversion element 15 passes through, and the hopper 21 is further driven upward, causing the light beam 16 to be blocked. Stop at the point where it stops. Paper feeding operation is performed by repeating the above operations. Third
The figure is a sectional view taken along the axis of the sticky roller when paper sheets 20a and 20b of different sizes are loaded in the hopper 21 in a mixed manner.

In this example, paper sheets of different sizes are used as an example, but as a large amount of paper sheets are loaded, such as double-folded paper sheets, paper sheets with a slight weight, and paper sheets with folds, the paper sheets will become fan-shaped. It is clear that this will happen. Even in the case of paper sheets stacked in a fan shape in this way, in the paper feeding device of the present invention, the bumper rollers can rotate independently, so that they conform to the slope of the surface of the paper sheets.
Since the sticky roller always comes into contact with the paper at two points, paper feeding errors occur due to a decrease in driving force, and skidding occurs due to uneven contact of the roller.
does not occur.

[Effects of the Invention] As explained above, the present invention has two gut shear rollers.
By dividing the hopper into two parts, each of which can be rotated independently, sheets of different sizes, folded in half, sheets with a seam, etc. can be stacked in the hopper, and the sheets can be arranged in a fan shape. Even if the stack is full, it is possible to reliably feed the paper. This thing is fast.

In devices that require information processing, it is possible to load more sheets of paper into the hopper than in the hopper, making it possible to significantly improve processing efficiency. It is formed by a line connecting the roller surfaces of the corolla and the pulp shear roller.It protrudes beyond the filter paper sheet conveyance path and is located downstream of the picker roller so that they do not come into pressure contact with each other. The effect is to separate the sheets using the difference in the coefficient of friction between the surface material of each roller and the sheet of paper, which has the effect of preventing multiple feeds with cylinder precision. In addition, since the reverse roller and picker roller are not in pressure contact with each other, even if the rollers rotate in different directions, the wear on the surface of each roller is slight, and it is possible to achieve a stable multi-feed prevention function over the long term. be.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a plan view, and FIG. 3 is a cross-sectional view of the Gunnon Yarroller shaft when paper sheets of different sizes are loaded. 2...Pusher roller, 3.4...
... Arm, 5 ... Pickarola, 6.7
．． 8.9...7'-IJ, 10. 11...
・Endless belt, 12...Arrow indicating pusher roller rotation direction, 13.14...Lever, 1
5...Photoelectric conversion element. 16... Luminous flux, 17... Reverse roller, 18° 19... Picker roller, 20...
・Paper sheets, 20a...Large paper sheets, 20b...
...Small paper sheets, 21 ...Hopper, 22...
・Hopper reciprocating drive direction arrow 0ka 1 figure

Claims (1)

[Claims] In a sheet feeding device that feeds sheets one by one using friction from the top of a stack of sheets, the rollers can rotate independently around the axis of the picker roller, and are each driven to rotate in synchronization with the picker roller. A paper sheet feeding device comprising two pusher rollers and a reverse roller provided corresponding to the picker roller and driven to rotate in a direction opposite to the picker roller.