JPS5812277Y2 - Resin tape repair ticket detection device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a resin tape repaired portion detection device for detecting paper defects repaired with a transparent resin tape in a paper defect sorting machine.

Conventional devices of this type detect paper damage that has been repaired with an opaque material such as paper tape.

This is detected because the amount of light that passes through the repaired portion of the repaired portion is smaller than the amount of light that passes through the adjacent portion of the repaired portion that has not been repaired.

However, with this type of device, the amount of transmitted light is lower at the paper defect repaired area using transparent tape compared to the area near the paper defect repair area due to the transparency of the tape used for repair. There is little or very little difference.

Therefore, detection by comparing the amount of transmitted light was impossible.

This idea was made in view of the above points, and it shines light on the paper from an oblique direction, and the reflected light is divided into at least two
By receiving light at a point and detecting the difference in light amount between the two points due to diffuse reflection when there is no transparent tape, and the difference in light amount between the two points due to total reflection when there is transparent tape,
The present invention provides a resin tape repaired portion detection device which is capable of detecting even paper defects repaired with a transparent resin tape.

An embodiment of this invention will be described below, but prior to that, FIG. 1 shows a schematic configuration of a paper quality/damage sorting machine in which the apparatus of this invention is used.

As shown in the figure, the feed section for feeding out the loose sheets of paper stacked in the hopper part 1 one by one consists of a feed roller 2 having a suction dead weight by suction pressure and a round belt around the periphery, and a paper scraper 3. We are prepared.

The paper waste that is about to be sent along with the paper waste adsorbed by the feed roller 2 remains at the current position by the paper scraper 3, and only one sheet is sent out.

The paper sent out from the feed section is connected to the feed belt section 4,
The sheets are conveyed through a conveying section having a plurality of roller portions 5, and are accumulated in a correct bill accumulating section 6 for accumulating normal and defective sheets.

Double feeding, continuous feeding,
There are various types of equipment, such as a discrimination unit for detecting abnormalities in the feeding condition such as skew feeding, a discrimination unit for detecting dirt, damaged bills, and mixed paper of different types, and a discrimination unit for detecting reversed paper defects. A discriminating section is provided, and the defective paper judged by these discriminating sections is removed by a plurality of rejection plates 7 and 8 provided in the middle of the conveying section, and the rejected paper is collected in a plurality of rejected ticket stacks. are integrated into sections 9 and 10.

The resin tape repair ticket detection device according to this invention is used as one of the discriminating sections provided close to the conveyance section, and the button is exemplarily indicated by the reference numeral 11 in FIG. .

The paper waste detected by the device 11 is collected from the rejection plate 8 into the rejected ticket stacking section 10.

Figure 2 shows a resin tape repair ticket detection device 11 according to this invention.
It is a diagram for explaining the operating principle of the transparent tape 20.
The paper damage 21 thus repaired is shown being transported through the apparatus 11 of FIG. 1.

The light source 22 directs a luminous flux Lo from obliquely upward to a point P on the edge of the paper, and the obliquely upper light receiver 23 and the upper light receiver 24 are arranged to receive the reflected light from the edge surface.

The upper receiver 24 is located above the point P, and the upper receiver 24 is located above the point P.
3 is arranged at a position symmetrical to the light source 22 with respect to the line connecting the point P and the light receiver 24.

In this embodiment, the angle between the line connecting the light source 22 and the point P and the line connecting the point P and the light receiver 23 is a right angle.

When the transparent tape 20 passes over the point P, the light beam Lo from the light source 22 is almost totally reflected on the surface of the tape 20, and the rest reaches the surface 1 of the paper and is diffusely reflected.

A part of the light that is diffusely reflected on the surface of the paper enters the upper diagonal receiver 23 and the upper receiver 24 as Ll and Lj, respectively, and the light L2 that is almost totally reflected on the transparent tape enters the upper diagonal receiver 23. .

FIG. 3 shows an example of the circuit of the device according to this invention, in which the output sides of the diagonal upper light receiver 23 and the upper light receiver 24 are connected to an operational amplifier 25 in an inverse relationship to each other.

Assuming that the output voltages of the diagonal upper receiver 23 due to the reflected lights L1 and L2 are VLt and VL2, respectively, and the output voltage of the upper receiver 24 due to the reflected light L3 is VL3, the input voltage to the operational amplifier 25 is (VL 1 +VL2 ) − VL
3 Tonal.

According to experimental data, the lights L1 and Lj due to diffuse reflection on the opposite side of the paper are approximately equal, and therefore become vL3 in VLt, so that the input voltage to the operational amplifier 25 becomes substantially VL2.

However, when a piece of paper with no transparent tape pasted passes through the device 11, the total reflected light L2 on the transparent tape 20
does not exist, the input voltage to the operational amplifier 25 is VL
I-VL3, which is essentially zero.

The output of the operational amplifier 25 is given to a comparator 26 and compared with a reference value.

When the transparent tape pasted on the paper passes point P in FIG. The output of 27 changes from a high level to a low level, which passes through a buffer circuit 28 and reaches a flip-flop 29.

Then, the output f of the flip-flop 29 is inverted from a low level to a high level, and operates a solenoid (not shown) for opening the removal plate 8 of the removal ticket stacking section 10 to the position shown by the dotted line in FIG. Then, the transparent tape-attached papers are stacked in the rejected ticket stacking section 10.

Note that the Noah Gate 27 is shown as having six input terminals, but the paper is usually folded in four and has three creases, and tape is often pasted on these parts, so there are six input terminals on the front and back sides. This is based on the assumption that detection will be performed.

As described above, according to this invention, two light receivers are provided,
The system is configured to detect the difference in the amount of light received when transparent tape is attached to the damaged paper and when it is not attached, so even if the damaged note has been repaired with landscaping tape, it can be detected and eliminated. The effect is that it can be done.

Further, with this same configuration, the detection device detects only the totally reflected light from the transparent tape, so that the detection operation is not affected by external light conditions.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing the general configuration of the paper quality/deficiency sorting machine;
The figure is a layout diagram of a light source button and a light receiver for explaining the principle of the resin tape repair ticket detection device according to this invention, and FIG. 3 is a diagram showing the electric circuit section of the resin tape repair ticket detection device according to this invention □. . In the figure, 20 is a transparent resin tape, 21 is a paper tape, 2
2 is a light source, 23 is a first light receiver, 24 is a second light receiver,
L1 and L3 are diffusely reflected lights, L2 is totally reflected light, 25 is an operational amplifier, and 26 is a comparator.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. In a repaired part detection device provided in a discrimination section of a paper defect sorting machine, a light source that directs a light beam from an oblique direction toward the paper defective surface;
a first light receiver disposed at a position to receive the diffusely reflected light from the opposite side of the paper, and also receive the totally reflected light from the opposite side of the paper when there is a transparent resin tape on the opposite side of the paper; , a second light receiver disposed at a position to receive only the diffusely reflected light from the opposite side of the paper, and a difference in output voltage between the second light receiver and the second light receiver, and the transparency on the opposite side of the paper. A resin tape repair part detection device comprising: a discrimination circuit section for detecting the presence or absence of a resin tape. 2. The discrimination circuit section is configured to receive an output difference between the first and second light receivers. A resin tape repair portion detection device according to claim 1, comprising: an operational amplifier connected to the operational amplifier; and a comparator connected to compare the output of the operational amplifier with a predetermined reference value.