JPH04129952A - Double feed detecting device for bill conveyer - Google Patents

Abstract

PURPOSE:To prevent a bill from being damaged so as to detect a double feed with no influence to a pattern of the bill by providing an ultrasonic transmitter vertically upward relating to a conveying direction of the bill, ultrasonic signal receiver after the bill passes and a waveform analyzer of an output signal in an opposite side to the ultrasonic transmitter. CONSTITUTION:An ultrasonic transmitter 1 is provided vertically upward relating to a conveying direction C of bills 4, 5 to generate an ultrasonic signal relating to the bills 4, 5. An ultrasonic receiver 2 is provided in an opposite side to the transmitter l relating to the bills 4, 5 to receive the ultrasonic signal transmitted from the transmitter 1 to pass through the bill 4 or 5. Further, a waveform analyzer 6 inputs an output signal 101 of the receiver 2 to analyze a waveform of the output signal 101. When the bills 4, 5 are advanced in a direction of an arrow mark C in a doubled condition in a part B to come between the transmitter 1 and the receiver 2, the output signal 101 of the receiver 2 generates a large output in a part A with only the 4 bill and a small output in the part B with the bills 4, 5 overlapped. Then, the waveform analyzer 6 detects a difference between the outputs and a double feed of the bills.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a detection device for detecting double conveyance of banknotes in a banknote conveyance device.

[Conventional technology]

Conventional detection means for detecting double conveyance of banknotes in a banknote conveying device include means of detecting by applying pressure to the banknote and measuring its thickness, or means of detecting by applying pressure to the banknote and measuring the thickness thereof, or means of detecting the double conveyance of banknotes by projecting light on the banknote. Detection means is adopted by measuring the amount of transmitted light.

[Problem to be solved by the invention]

Among the double conveyance detection means of the conventional banknote conveyance device as described above, the former means for mechanically measuring the thickness of banknotes is as follows:
The disadvantage is that it can damage banknotes. Furthermore, the latter method of measuring the amount of light that passes through a banknote has the disadvantage that it is difficult to accurately detect the thickness of the banknote because various patterns are printed on the banknote.

[Means to solve the problem]

A double conveyance detection device for a banknote conveyance device according to the present invention includes: an ultrasonic transmitter that generates an ultrasonic signal for a banknote; an ultrasonic receiver that receives the ultrasonic signal after passing through the banknote; A waveform analyzer for analyzing the waveform of the output signal of the multi-layer ultrasonic receiver. That is, the double conveyance detection device of the banknote conveyance device of the present invention is provided perpendicularly above the conveyance direction of the banknote. an ultrasonic transmitter that generates an ultrasonic signal to the banknote; and an ultrasonic transmitter that is installed on the opposite side of the banknote to the ultrasonic transmitter and receives the ultrasonic signal from several layers after passing through the face-layer banknote. The ultrasonic receiver includes a sonic receiver and a waveform analyzer that analyzes the waveform of the output signal of the ultrasonic receiver.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a front view showing one embodiment of the present invention, and FIG. 2 is a front view showing one embodiment of the present invention.
FIG. 3 is a waveform diagram showing an example of the waveform of an output signal of the ultrasonic receiver in the illustrated embodiment.

In FIG. 1, the ultrasonic transmitters 1 are provided twice perpendicularly to the conveyance direction C of the banknotes 4 and 5, and generate ultrasonic signals to the banknotes 4 and 5. The ultrasonic receiver 2 is provided on the opposite side of the ultrasonic transmitter 1 to the banknotes 4 and 5, and receives the ultrasonic signal transmitted from the sonic transmitter and passed through the banknote 4 or 5. The waveform analyzer 6 manually inputs the output signal 1.01 of the ultrasonic receiver 2 and analyzes its waveform.

Arrow C when banknotes 4 and 5 overlap in part B
When the ultrasonic transmitter 1 and the ultrasonic receiver 2 move in the direction, the output signal 10 of the ultrasonic receiver 2 is transmitted to the A portion of the banknote 4 only, as shown in FIG. The output is large, and becomes small in the part B where banknotes 4 and 5 overlap. The waveform analyzer 6 detects this difference and detects double conveyance of banknotes.

[Effects of the Invention J As explained above, the single-fold conveyance detection device of the banknote conveyance apparatus of the present invention can detect the overlapping JJe state of banknotes in a non-contact state using ultrasonic signals. This has the effect of preventing damage to the Furthermore, since ultrasonic signals are used, it is not affected by the pattern of the banknotes, and it is possible to accurately detect single conveyance of banknotes.

[Brief explanation of drawings]

3 is a front view showing an embodiment of the present invention, and FIG. 2 is a waveform diagram showing an example of the waveform of the output signal of the ultrasonic receiver in the embodiment of FIG. 1... Ultrasonic transmitter, 2... Ultrasonic receiver, 4, 5... Banknote, 6... Waveform analyzer.

Claims (1)

[Claims] 1. An ultrasonic transmitter that generates an ultrasonic signal on a banknote, an ultrasonic receiver that receives the ultrasonic signal after passing through the banknote, and an ultrasonic receiver that receives the ultrasonic signal after passing through the banknote. A double conveyance detection device for a banknote conveyance device, comprising a waveform analyzer that analyzes the waveform of an output signal. 2. An ultrasonic transmitter that is provided perpendicularly above the banknote conveyance direction and generates an ultrasonic signal to the banknote; and an ultrasonic transmitter that is installed on the opposite side of the banknote from the ultrasonic transmitter to generate an ultrasonic signal for the banknote. A double conveyance detection device for a banknote conveyance device, comprising: an ultrasonic receiver that receives the ultrasonic signal after passing; and a waveform analyzer that analyzes the waveform of the output signal of the ultrasonic receiver. .