JPS594075B2 - Pattern Kensa Sochi - Google Patents

Description

[Detailed Description of the Invention] The present invention inspects five pattern bodies to be inspected, depending on whether the sheet-like pattern body to be inspected, such as a banknote, matches the width and length of a preset authentic pattern. This system was developed for the purpose of improving the configuration of the pattern inspection device and using a relatively small group of detectors to accurately discriminate the pattern object to be inspected, regardless of the feed speed of the pattern object. It is something.

10 First, the embodiment will be explained based on the attached drawings.
i is a pattern body to be inspected having a constant width W and a constant length d, such as a 1000 yen bill; 1 is a passage case through which this pattern body to be inspected passes; the passage case inserts the pattern body Pi to be inspected. It has an insertion port 152 for discharging and an ejection port 3 for discharging.

Reference numeral D1 denotes a group of detectors for checking the insertion of the pattern to be inspected Pi, which is provided near the insertion opening 2 of the passage case 1. A device (not shown) is actuated to detect the insertion of the pattern body Pi into the insertion port 2 and draw the pattern body to be inspected further into the passage case 1. D
el and De2 are edge detectors for detecting one side and the other side of the pattern body Pi to be inspected, which are provided near the center of the passage case 1;
A signal corresponding to the pattern on the side of i is emitted, and both edges of the pattern body P1 to be inspected, which is composed of a light source, a light receiving element or a magnetic detecting element, etc. and moves within the passage case 1, are detected 30, and as shown in FIG. As shown in FIG. 3, an edge detection signal e, which is the sum of both detection signals, is output.

DA in FIG. 2 is a differential (comparison) amplifier, and the differential amplifier is used to detect the edge detection signal e) and the width of the genuine pattern body of the pattern body Pi to be inspected. The signals tw are inputted and compared, and a width inspection signal i is output.

In other words, if the edge detection signal e is larger than the true width signal tw by 1η, both the edge detectors Del and De2 are detecting the pattern to be inspected Pi, so the width inspection signal 1 becomes low level. Depending on whether or not the width w of the pattern body Pi to be inspected is the same as the width of the genuine pattern, it can be inspected.

TS is a prime value discriminator installed after the differential amplifier DA, and the prime value discriminator is composed of a pair of comparators CMl, CM2, etc., and inputs the width test signal 1, so that the test signal is set in advance. When it exceeds the orgasm value range h, it becomes a high level,
If it is within the peak value width h, a pulse signal P having a low level is output. G is a NAND gate provided after the live value discriminator TS, which inputs the pulse signal P and also receives the pulse train signal Pd synchronized with the drawing speed, that is, the feeding speed of the pattern body Pi to be inspected into the passage case 1. When the input pulse signal P is at a low level, the pulse train signal Pd is passed through and the test pulse signal w&d is output. CT is a counter provided after the NAND gate G, and this counter inputs the test pulse signals w&d, counts them, and outputs a count signal α.

Note that R is a signal for resetting the counter CT, and this signal is applied at the start, such as when the detected pattern body Pi is inserted into the passage case 1 and detected by the detector Di. PS is a setting device, and the setting device outputs a genuine count signal β based on the genuine pattern body of the detected pattern body Pi. G1 is an AND gate connected after the counter CT, which gate inputs the count signal α and the true count signal β, and outputs the true signal w only when the count signal α matches the true count signal β.
Output '0Cd'. To explain the waveform diagram in Figure 3, the edge detector output e of Del and De2 is like the waveforms in Figure 3 e and i, where the left side is the normal detection pattern and the right side is the waveform of the abnormal (black) detection pattern. .

RIuh is the width for determining the next stage's vitality value. Each output, like the P waveform, is generated by a peak value discrimination circuit. It looks like a pulse Pd waveform diagram synchronized with the feed speed of the detected pattern, and P
．． ll! 1: Counted by the CT circuit by synchronization of Pd. When the detected pattern is sent and stopped lol
The output of d' is output on the left side as shown in the waveform w'0Cd' in FIG. 3, but not on the right side.

In the present invention as described above, when a pattern body Pi to be inspected, such as a 1000 yen bill, is inserted into the insertion opening 2 of the passage case 1, the pattern body Pi to be inspected is detected by the detector Di. The drawing device further draws the pattern body Pi to be inspected into the passage case 1, and the detectors Del and De2 group detect both sides of the pattern body to be inspected, and an edge detection signal e is output. will be done.

In this way, the edge detection signal e is comparatively inspected via the differential amplifier DA which inputs the true width signal Tw set in advance, and it is confirmed that the width w of the pattern body Pi to be inspected is the same as the width of the true pattern. A width test signal 1 is outputted from the differential amplifier DA, and a pulse signal P is outputted via the peak value discriminator TS.

Next, when the pulse signal P is at a low level (the width detection signal is within the current value ) only when the pulse train signal P
d is passed as the test pulse signal w&d.

The test pulse signals w&d are counted by a counter CT,
When the count signal α of the counter CT matches the true count signal β corresponding to the length of the true pattern of the pattern body Pi to be inspected, the AND gate G1 outputs the true signal w'&D7, and the pattern to be inspected is determined to be true. Deemed, conversely true signal 1&
d is not emitted, the pattern to be inspected is regarded as false, and the width w and length d of the pattern to be inspected Pl are inspected. In the present invention as described above, a width detection signal is obtained by differentially comparing an edge detection signal based on a pair of edge detectors that detect both sides of a pattern to be detected and an authentic width signal corresponding to the width of an authentic pattern. The width of the pattern object to be inspected is inspected depending on whether it is within the preset value, and only when this width detection signal is within the limit value, the pulse train signal synchronized with the feed speed of the pattern object to be inspected is inspected. When the count signal of the counter that counts the test pulse signal is equal to the genuine count signal based on the length of the genuine pattern of the genuine pattern body of the pattern body to be inspected, the genuine signal is outputted. Since the length of the inspection pattern body is inspected, the number of detector groups can be reduced to two, which is relatively small, and the length of the inspection pattern body Pi can be adjusted regardless of the moving speed of the inspection pattern body Pl. Width lol
In addition, it has great practical effects, such as being able to accurately inspect the length d.

[Brief explanation of drawings]

FIG. 1 is a schematic plan view showing the main parts of an embodiment of the present invention;
FIG. 2 is a wiring diagram of the same embodiment, and FIG. 3 is an operating waveform diagram. Pi... Pattern body to be inspected, Del, De2.
...Detector, DA...Chamber motion (comparison) amplifier, TS...Iki value discriminator, G...Nand gate, Tw...・・True width signal, Pd・・
...true length pulse signal, w...width, d...
···length .

Claims (1)

[Claims] 1 A pair of edge detectors that detect one side and the other side of a moving pattern body to be inspected, an edge detection signal that is the sum of the detection signals of the detectors, and an edge detection signal that is preset based on the width of the true pattern body of the pattern body to be inspected. an amplifier that differentially amplifies the true width signal and outputs a width detection signal, and a width detection signal from the amplifier that is determined by a preset value and converted into a pulse signal. Only when a signal indicating that the width detection signal is at the above-mentioned peak value is emitted from the peak value discriminator and the peak value discriminator, a pulse train signal synchronized with the feed speed of the pattern body to be inspected is sent as a test pulse. A gate that outputs a signal, a counter that counts the inspection pulse signal from the gate, and a gate that emits an authentic signal only when the count signal of the counter is equal to an authentic count signal based on the length of the authentic pattern of the pattern body to be inspected. 1. A pattern inspection device, characterized in that the width and length of the pattern body to be inspected are inspected.