JPS6231638A - Paper sheet separating device for automatic paper feeder - Google Patents

Abstract

PURPOSE:To prevent letters from blurs and a paper sheet from stains even if pencil written manuscripts are inserted, by making a roller rotating in the opposite direction to the feed direction of the paper sheet and a frictional pad contact with a belt. CONSTITUTION:A drawing-out roller 3 bears against the central front edge of stacked paper sheets 2 and rotates to feed out the paper sheet 2 in the direction of the arrow. The fed-out paper sheet 2a is inserted into the contact portion of a belt 8 with a roller 13 and further into the contact portion of the belt 8 with a frictional pad 14. Since the belt 8 comes in contact with the roller 13 and the frictional pad 14 in the tensioned portion of the belt 8, the contact force is small so that the force acting on the inserted paper sheet 2a is small. Thus, while the paper sheet 2a advances in the contact portions of the belt 8 with the roller 13 and the frictional pad 14, the underside paper sheet of the advanced paper sheets 2a engages sequentially the frictional pad 14 so that only the uppermost paper sheet passes through.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a paper separation device for an automatic paper feeder, and relates to an optical character reader (hereinafter referred to as ROCR).

The present invention relates to a device that is particularly suitable as a paper separation device for an apparatus that automatically feeds originals to a paper feeder.

1. Prior Art and Problems Conventionally, paper separation devices of various structures have been used in paper feed devices of printers and copying machines. Among these, those with a structure that separates paper by passing it between a friction surface that moves in the paper feed direction and a friction surface that blocks the paper feed, provide stable separation regardless of the paper quality of the paper used. It is characterized by its ability to function. 4 and 5 are diagrams showing conventional devices having this type of structure, and the one in FIG. 4 shows a nip portion 43 between a roller 41 rotating in the feeding direction of the paper 2 and a friction pad 42 that comes into contact with the roller 41. The paper is separated by passing the paper 2 through the fifth
What is shown in the figure is a belt 8 that rotates in the feeding direction of the paper 2.
The paper 2 is passed between the friction pad 14 and the friction pad 14 that is in surface contact with the friction pad 14.

Incidentally, in OCR, a pencil-written original is sometimes supplied, but in the structure shown in FIG. 4, the paper is rubbed under the strong pressure of the nip 43 in line contact. When inserting a document written in pencil, the characters may become blurred or the paper may become smudged. In addition, in the structure shown in FIG. 5, the sliding force against the paper is relatively small, but the paper 2a is in the third position between the belt 8 and the friction pad 14.
As shown in the figure, there is a risk that the second sheet of paper will be dragged out while paper feeding continues, resulting in double feeding.

1. Purpose of the Invention This invention was made with the aim of solving the above-mentioned problems that occur when a paper separating device of conventional structure is adopted in an automatic paper feeding device for OCR. To provide a paper separating device that does not cause blurred characters or stains on paper even when the paper is fed, and there is no possibility of double feeding occurring even if paper feeding operations are continued.

Means for Accomplishing One Object - The present invention provides a paper separating device that uses a belt 8 as a means for applying frictional force in the paper feeding direction, in which a roller rotating in the opposite direction to the paper feeding direction is attached to the belt. 13 and the friction pad 14, the roller 13 is placed on the paper entry side of the friction pad 14, and the roller 1
The roller 13 and the friction pad 14 are brought into contact with the belt 8 at the stretched portion of the belt 8, that is, the portion between the pulleys 10 and 11, so that a nip portion is not formed between the belt 8 and the friction pad 4. It was placed in

One effect is that in the paper separating device of the present invention, the second and subsequent sheets of paper 2a that have accumulated between the friction pad 14 and the belt 8 as shown in FIG. 1, and since no nip is formed between the belt 8, roller 13, and friction pad 14, no strong sliding force is applied to the paper.

One Embodiment - Fig. 1 is a side view showing the main structure of the present invention, in which 1 is a paper table, 2 is a manuscript paper stacked on the paper table 1, and 3 is in contact with the upper surface of the manuscript paper 2. A feed-out roller rotates to feed out the paper 2, 4 is a paper leading edge guide, 5 is a paper feed roller mounted on the frame of the OCR, and 6.7 is a paper guide.

Reference numeral 8 denotes a heddle wound between the driving pulley 9 and the driven pulleys 10 and 11, and the belt 8 is driven in the feeding direction of the paper 2 by a lower driving shaft 12 that passes through the driving pulley 9 in a slidable but non-rotatable manner. being driven. 13 is a roller that rotates in the direction opposite to the feeding direction of the paper 2; 14 is a friction pad provided at a fixed position; It is in contact with the belt 8 by a spring. 15 is a lower drive shaft that passes through the roller 13 in a slidable but non-rotatable manner, and 16 is a guide rod mounted parallel to the lower drive shaft 15.

Reference numeral 17 shown in imaginary lines in FIG.
The frame 19 is a frame that is pivotally supported around a and supports the driven boots I710 and 11, and the frame 19 is a frame that pivotally supports the roller 13 and is equipped with a friction pad 14.
The frames 17 and 18 are constructed as shown in perspective in the figure.
is slidably mounted along the lower drive shaft 12, and the frame 19 is mounted so as to be slidable along the lower drive shaft 15 and the guide rod 16.

Figure 2 shows the upper and lower units 20.2 configured as described above.
1 is a diagram showing a mechanism for positioning paper 2 at the center of inserted paper 2. Reference numerals 22 and 23 are connecting arms fixed to frames 17 and 19, respectively. The reconnecting arms 22 , 23 extend laterally to the outside of the paper path 24 and are bent so as to be adjacent to each other, and the end edges 26 of the bent ends of the arms 23 engage with forks 25 formed at the bent ends of the arms 22 . is included. 27 and 2
Reference numeral 8 denotes sleeves located at the bent portions of the arms 22 and 23, and the sleeves 27 and 28 are rotatably attached to the arms 22 and 23 and slidably attached to the drive shafts 12 and 15, respectively.
2.23 is supported.

Reference numeral 29 denotes a right side guide mounted on the paper table 1 so that the right and left positions can be freely adjusted according to the width of the paper, and 30 is provided so as to be slidable along a guide hole 32 in the left and right direction provided in the frame 31 of the paper separation device. This is a moving block, and the proximal edge 34 of the side guide 29 is engaged with the fork 33 of the moving block 30. A belt 37 is attached to the movable block 30, which is wound between the boots I735 and 36 which are pivoted to the frame 31, and which is integral with the pulley 35.36 and connected to the pulley 35.3.
The arm 23 of the frame 19 is attached to a belt 40 that is wound between pulleys 38 and 39 having a diameter of 6 1/2.

With the above configuration, when the side guide 29 is moved in accordance with the paper width, the upper and lower units 20 and 21 of the paper separation device
moves in the same direction as the side guide 29 by 1/2 the amount of movement, and feeds out roller 3, paper separation belt 8, and roller 13.
Furthermore, the friction pad 14 can always be positioned at the center of the paper 2, and tilting of the paper can be avoided, especially when feeding wide paper.

Next, the paper feeding operation of the above-described apparatus will be explained. The feed roller 3 contacts the center of the front edge of the stacked paper 2 and
The paper 2 is sent out by rotating in the direction of the arrow in the figure. The fed paper 2a is inserted into the contact area between the belt 8 and the roller 13, and further inserted into the contact area between the belt 8 and the friction pad 14. The belt 8, the roller 13, and the friction pad 14 are the stretched portion of the belt 8 (the portion between the pulleys 10 and 11).
Since the contact force is small, the frictional force acting on the inserted paper 2a is also small.

Therefore, the paper 2a enters the contact area between the belt 8, the roller 13, and the friction pad 14, but the roller 13 is rotating in the direction to send back the paper below the paper 2a, and the belt 8 and the friction pad Since the paper 2 is in contact with the paper 14 at a certain distance in the paper feeding direction, the paper 2 that has entered the contact area
As shown in FIG.
4, and in the end only the top one passes through. In order to perform this paper separation effect more reliably, it is preferable that the frictional force of the roller 13 against the paper is smaller than the frictional force of the belt 8 and larger than the frictional force between the sheets.

When the sheet of paper 2b that has passed is caught between the paper feed rollers 5 of the OCR, the frames 17 and 18 are moved upward around the upper leg movement axis 12 by a mechanism not shown in order to release the paper feed load. The feeding roller 3 and belt 8 are separated from the paper 2a. As a result, the frictional force in the feeding direction for the second and subsequent sheets of paper that has entered between the belt 8 and the friction pad 14 is released, and the second and subsequent sheets are moved to the paper tray by the frictional force in the return direction that is applied from the roller 13. You will be sent back up to 1.

Therefore, in the device of the present invention, the belt 8 of the sheet separating device
Paper does not stay between the pad 14 and the friction pad 14.
Further, since the roller 13 and the friction pad 14 are in contact with the belt 8 at the stretched portion of the belt 8, the sliding force acting on the paper 2 is also small.

-Effects of the Invention- As is clear from the above description, the paper separation device of the present invention eliminates the risk of blurring characters or staining the paper even when the original is in a pencil case, and double feeding by continuous paper feeding is possible. There is no risk of this occurring, and the frictional load that acts on the fed paper is also eliminated, making it possible to feed the paper accurately.It is particularly useful as a paper separation device in an automatic paper feeder for OCR. A suitable device can be obtained.

[Brief explanation of drawings]

1 and 2 are views showing one embodiment of the present invention, with FIG. 1 being a side view showing the structure of the main part, and FIG. 2 being a perspective view showing the overall structure. FIG. 3 is a side view schematically showing the state of paper that has entered between the belt and the friction pad, and FIGS. 4 and 5 are side views schematically showing the conventional apparatus. In the figure,

Claims (1)

[Claims] 1. In a paper separation device that separates paper by passing between a friction surface that moves in the feeding direction of the media sheet and a friction surface that blocks the feeding, a friction surface that moves in the feeding direction. is formed by the belt surface, and the friction surface that prevents paper feeding is formed by the circumferential surface of a roller that rotates in the opposite direction to the paper feeding direction and a fixed friction pad surface, and the roller prevents the friction pad from entering the paper. a sheet separating device, wherein the roller and the friction pad are in contact with the belt at a tensioned portion of the belt. 2. The upper unit to which the feed roller and the belt of the paper feeding device are attached, and the lower unit to which the roller and friction pad are attached are each slidably attached to a vertical drive shaft suspended horizontally on the frame, and each 2. A sheet separating device according to claim 1, wherein the connecting arms are extended and the connecting arms are connected to each other outside the side of the sheet path. 3. A paper side guide provided movably in the width direction of the paper on the paper table and the upper or lower unit move the unit in the same direction by a movement amount that is 1/2 of the movement amount of the side guide. 3. A sheet separating device as claimed in claim 2, which is linked via a drive coupling mechanism.