JPS63300031A - Paper sheet feeding mechanism of character identification device - Google Patents

Abstract

PURPOSE:To feed paper sheets one by one reliably by forming both the reverse roller and a picker roller in such forms as having the contacting faces with recessed and projected cross section, respectively. CONSTITUTION:A paper sheet 8 fed out of a pusher roller 3 goes between both a picker roller 4 having the recessed outline and a reverse roller 5 having the projected outline. At this time, the reverse roller 5 turns reversely to the transportation direction so that if two or more sheets 8 are fed out of the roller 3, the backing force is applied to the lower sheet. In addition, since the picker roller 4 in contact with the sheet 8 turns in the transporting direction, the sheet 8 is subject to the feed-out force. At this time, since the two rollers 4 and 5 have the concaved and the convexed face, respectively, the feed-out force against the sheet 8 acts more particularly in the opposing areas of the picker roller 4 when the sheet is fed out while the backing force acts more particularly in the middle area of the reverse roller 5.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a paper feeding mechanism in information equipment, and in particular to a paper feeding mechanism that reliably feeds stacked paper sheets one by one into an optical character recognition device. Regarding.

(Prior Art) Conventionally, this type of paper feeding mechanism, as shown in FIG.
Using the difference in the coefficient of friction between the paper sheets 25 and 2, the group of paper sheets 25 loaded on the fa is sent out in order from the top, and the sheets are separated one by one by a picker roller 23 that is in contact with each other and a reverse roller 24 that rotates in reverse, and the sheets are fed.

(Problems to be Solved by the Invention) The conventional paper feeding mechanism described above separates stacked paper sheets one by one by using the difference in the coefficient of friction between the paper sheet, the bumper roller, the picker roller, and the reversing roller. However, the force used to feed or separate paper sheets using these friction rollers depends on the friction coefficient of the paper, and the conveyance conditions vary depending on the area, thickness, stiffness, surface resistance, etc. of the paper. Depending on the properties of the paper, it is difficult to reliably separate the sheets and send out only one sheet, resulting in incomplete separation and, in some cases, damage to the sheets.

The present invention provides a paper feeding mechanism that utilizes the difference in the coefficient of friction between paper sheets and rollers, and is capable of extremely easily and reliably feeding paper sheets one by one in accordance with various paper conditions. This is what we provide.

(Means for Solving the Problems) The paper feeding mechanism of the present invention includes a bumper roller that contacts the uppermost sheet surface of a group of sheets stacked in a hopper section, and a bumper roller that is disposed downstream of the bumper roller in the paper feeding direction. In addition, the roller has a concave curved surface roller and a convex curved reverse roller, which are spaced apart from each other in order to feed one sheet of paper.

(Example) Next, the present invention will be described with reference to the drawings.

FIG. 1 is a schematic side view of a paper feeding mechanism according to an embodiment of the present invention. This embodiment includes a hopper section 1 loaded with a group of paper sheets 2, a butcher roller 3 that presses against the paper sheets for sending out the paper sheets from the hopper section 1, and a butcher roller 3 that contacts each other for separating the paper sheets downstream of the hopper section 1. It includes a reverse roller 5 and a bicker roller 4.

The reverse roller 5 and the bicker roller 4 rotate in opposite directions.

FIG. 2 is an axial cross-sectional view, that is, a vertical cross-sectional view, of the reverse roller 5 and the bicker roller 4 used in this embodiment. The cross section of the reverse roller 5 is a convex curved surface, and the cross section of the bicker roller 4 is a concave curved surface opposite to that of the roller 5. The roller 4 has its own drive system with a roller drive shaft 6, and the roller 5 has its own drive system with a roller drive shaft 7, and rotates in the direction of the arrow in the figure. As shown in the figure, these two rollers mesh with each other, into which the sheet 8 is fed to ensure reliable single-sheet feeding.

FIG. 3 is a perspective view showing the operating state of this embodiment. The paper sheet 8 sent out by the bushing roller 3 enters between a bicker roller 4 having a concave outer circumferential curved surface and a reverse roller 5 having a convex outer circumferential curved surface. At this time, the reverse roller 5 rotates in the opposite direction to the arrow 9 indicating the conveyance direction, so if two or more sheets 8 are sent out by the roller 3, a force is applied to push back the lower sheet. . Further, since the bicker roller 4 rotates in the conveyance direction of arrow 9 at the contact portion with the paper sheet 8, a feeding force acts on the paper sheet that is in contact with the roller 4. At this time, since the cross section of the two rollers 4 and 5 is uneven, the force acting on the paper sheet 8 between these rollers 4 and 5 is due to the stiffness and hardness of the paper sheet. The sending force is strong at both ends of the roller 4, and the pushing force is strong at the center of the reverse roller 5. Therefore, since two forces in opposite directions act on the sheet between the rollers at different locations, the force pushing back the sheet acts regardless of the feeding force. In other words, the frictional force exerted by the bicker roller 4 is constantly exerted at a different position from the frictional force exerted by the reverse roller 5, so that only the topmost sheet of paper in contact with the bicker roller 4 can be sent out reliably. Furthermore, since the cross section is curved, there is no uneven contact with the paper sheets that enter between the rollers 4 and 5, and an even force is exerted on the contact surface with the paper sheets, so that regardless of the number of sheets, there is no uneven contact with the paper sheets. It is possible to send out one sheet at a time without causing any damage. In addition, since the push-back force and the feed-out force act equally at different points, the single-sheet feeding mechanism also has the effect of suppressing the occurrence of skinny paper sheets in the transport direction.

(Effects of the Invention) As explained above, the present invention employs a single-sheet feeding mechanism in which the cross-sectional shape of each roller is a convex curved surface for the reverse roller and a concave curved surface for the bicker roller at the contact portion of the reverse roller and the vicker roller. , it is not necessary to adjust the gap between the reverse roller and the bumper roller and the contact pressure of the bumper roller for each sheet of paper of different sizes and paper types loaded in the hopper.
In addition, because the points of action of the push-back force and the paper feed force are at different locations, the effect of separating two sheets can be achieved without the difference in the coefficient of friction between each roller surface material and the paper sheet. This has the effect of making selection easier. Furthermore, since the roller has a curved cross-sectional shape, the present invention has the effect of suppressing the occurrence of skew, wrinkles, breakage, etc. of paper sheets in the conveying direction.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a paper feeding mechanism according to an embodiment of the present invention, FIG. 2 is a longitudinal cross-sectional view showing a state in which a reverse roller and a picker roller are engaged, and FIG. 3 is a perspective view showing an operating state of the present invention. , FIG. 4 is a schematic diagram of a conventional paper feeding mechanism. 1...Hopper part, 2,21...Paper leaf group, 3
．． 22... Butt roller, 4.23... Picker roller, 5.24... Reverse roller, 6.7... Roller drive shaft, 8... Paper leaf. Agent Patent Attorney Toshiyoshi Somekawa Figure 1 Figure 2

Claims (1)

[Claims] Paper leaves are fed between a reverse roller that rotates in the opposite direction to the paper feeding direction and a picker roller that is in contact with the reverse roller, and the paper sheets are separated one by one using the difference in the coefficient of friction between the paper sheets and the roller. A character recognition device characterized in that, in a paper feeding mechanism that feeds paper, the vertical cross-sectional shape of the contact portion of the reverse roller and the picker roller is formed such that the reverse roller has a convex curved surface and the picker roller has a concave curved surface. paper feeding mechanism.