JPS6030617B2 - Paper sheet double feed detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper sheet processing device, and more particularly to a double feed detection device for paper sheets.

To detect double feeding in conventional paper sheet processing equipment, a curved suction section is provided on one side of the conveyance path, and one of the paper sheets passing through the two stacked sheets is sucked by the suction section, and the paper sheets are sucked by the suction section, and There are methods in which one sheet is sent to the conveyance path and the other is sent at the end of the straight-line removal conveyance without being affected by the intake section, or rollers with different rotational speeds are opposed to each other in a part of the conveyance path, and the rollers are placed before and after the rollers. A method is adopted in which the change in length from the front green to the rear green of paper sheets is detected, and if there is a change, it is determined that two sheets should be fed and the paper sheets are sent to the removal conveyance path. was.

However, these conventional systems have drawbacks such as large noise generated from the intake section and complicated mechanisms. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a paper hollywood double-feed detection device that is noiseless and can be configured with a simple configuration and processing circuit.

According to the present invention, in the middle of the conveyance path of paper sheets made up of two belts, the conveyance path is bent, and at the bent part, the outer belt of the two belts is replaced with the inner belt. A space is created away from the paper, and two sets of photoreceptors are placed at different positions to detect paper leaves passing through that space.
A paper millet double-feed detection device that detects double-feed by comparing output signals from two light receivers is obtained.

The present invention will be described in detail below with reference to the drawings showing one embodiment of the present invention. FIG. 1 is a diagram showing an embodiment of the present invention, in which the conveying path consisting of belts 13a and 13b has a bending point, and the belt outside the bending point is connected to the inner belt so as not to restrict the paper sheets passing through. A void is created apart from the Here, one pair of light emitter/receiver 11a among the two pairs of light receivers is
, 12a are installed so that their light beams cross the conveyance path in order to detect the presence or absence of paper materials passing through this refraction part, and the other pair of optical receivers 11b and 12b separate from the inner belt 13b. In order to detect only the tip of the filter paper sheet that crosses the gap, the light beam is installed so that it crosses only the gap.
At this time, the width of the belt lining the conveyance path should be smaller than the minimum width for paper products, and the position should be such that the light produced by the emitter and receiver is not blocked by the belt and that grade mulberries can be detected. Place an obscuring receiver on the Transport route! The paper material that has entered the bending part from 5a passes through the gap, peels off from the belt 13b and advances linearly in the direction of extension of the conveyance path 15a until it reaches the belt 13a, and then passes through the gap and reaches the belt 13a.
and then sent to the conveyance path 15b.

At this time, the light entering the light receiver 12b is interrupted just before the tip of the sheet passes through the gap and reaches the belt 13a, and the light enters the conveyance path 15.
When b is reached, it becomes a pass. On the other hand, the light entering the light receiver 12a is interrupted at the same time as in the case of the light receiver 12b, but it is stopped when the end of the paper medicine reaches the conveyance path 15. Therefore, when paper sheets are being conveyed one by one, the light entering the light receiver 12b is also interrupted only once during the period when the light entering the light receiver 12a is interrupted once, but as shown in FIG. When two sheets of paper straw 14a and 14b are conveyed in an overlapping manner as shown in FIG. Light receiver 12
The processing circuit that receives the signals from the two light receivers 12a and 12b judges the state of the outputs of the two light receivers 12a and 12b and outputs a double feed detection signal. FIG. 2 shows the output signals of the light receivers 12a and 12b in the case of single-sheet feeding and double-sheet feeding. Two detection outputs are output from the light receiver 12b, and two-way feed is detected here.

FIG. 3 is a diagram showing an example of a processing circuit that processes signals from the light receivers 12a and 12b. Reset. The counting circuit is a counting circuit with a count value of 2 that receives the signal B from the light receiver 12b and counts this as a clock, and sends the counting output to the gate 18. The gate 18 receives the signal A that has passed through the other inverter 9, and when the tip of the paper mackerel is detected twice during the paper mackerel detection period of the A signal, a double feed detection signal is output from the gate 18. . Even when paper sheets are sent in duplicate,
If the overlapping direction is opposite to that shown in FIG. 1, two sets of submersible receivers may be arranged as shown in FIG.

In the figure, the end of the paper hollyhock passing through the bending part blocks the light entering the light receiver, and the mutual longitudinal positional relationship of the paper hollyhock 14a and 14b, which are conveyed in duplicate, is 1st
Double feeding can also be detected in the opposite case to the case shown in the figure. As described in detail above, according to the present invention, a simple and low-noise two-way detection device can be obtained.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a first embodiment of the present invention, and FIG. 2 is a diagram showing a first embodiment of the present invention.
Figure 3 shows the signal waveforms obtained from the two receivers in Figure 3.
FIG. 4 is a diagram showing the configuration of a processing circuit, and FIG. 4 is a diagram showing another embodiment of the present invention. In the figure, 11a, 11b... projector, 128,
12b... Light receiver, 13a, 13b...・Belt, 14a, 14b... Paper sheets, 15a, 15b...
...Transfer omitted, 16...Fall detection circuit, 1
7... Counting circuit. Figure 2 Figure 1 Figure 3 Figure 4

Claims (1)

[Claims] 1. A conveyance path that is composed of two belts and conveys paper sheets while sandwiching them; and a space that is created by bending a part of the conveyance path and separating the two belts from each other at the bent part. , a first paper sheet detector comprising a light emitter and a light receiver, the first paper sheet detector having an optical axis in a direction crossing the conveyance path and detecting paper sheets passing through the space; and a first paper sheet detector comprising a light emitter and a light receiver. a second paper sheet detector that has an optical axis in a direction that does not cross the conveyance path and crosses the space, and detects paper sheets that pass through the space; and the first and second paper sheets. When a paper sheet is detected by the first paper sheet detector after receiving a signal from the detector, and when a paper sheet is detected several times by the second paper sheet detector. 1. A double-feed paper sheet feed detection device, comprising a processing circuit that outputs a feed-feed detection output.