JPS5926981B2 - Sentakuzumioshi Button Switch Chikenchi Souchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for detecting a push button switch selected by a customer from among a plurality of selection push button switches provided in a vending machine.

In this type of device, when a customer inserts money while pressing a plurality of push buttons, it is desired that the lower denomination (or higher denomination) push button is always regarded as valid and processing is performed.

For this reason, in conventional devices of this type, one fixed contact of a push button switch is connected in series via a movable contact, and the other fixed contact is connected separately to a scanning device such as a ring counter. It is configured to detect which switches are open (or closed) by sequentially scanning the switches and checking whether each switch is open (or closed), thereby reducing wiring work. This is troublesome, and if there is a disconnection in the wiring of fixed contacts connected in series via a movable contact, the push button corresponding to that part will operate as if it had been scanned.

Further, the conventional device did not operate as a low-value (or high-value) priority device when a customer inserted money with multiple pushbutton switches pressed down.

The present invention provides a highly reliable push button switch detection device that is easy to wire and operates as a low denomination or high denomination priority device even if coins are inserted with multiple push button switches pressed down. The purpose is to

The present invention will be described below based on embodiments shown in the drawings.

In the figure, 1 is a that is operated separately by the selection push button.
A group of contact switches, each switch thas1+S2...
- For Sn, one fixed contact is an AND circuit.

are connected in common to a first input terminal of the scanning device 2, and the other fixed connection points are individually connected to the scanning device 2.

The scanning device 2 includes each switch S1. S2...Sn,
In order to check the switch corresponding to the push button pressed by the customer, each switch scanning signal "1" is sent to Sl,
This device scans each switch by repeatedly supplying S2...Sn, Sl, S2... in sequence, and is composed of a counter C and a decoder D in this embodiment.

A ring counter can also be used as the scanning device.

The counter C repeatedly counts the clock pulses supplied through the terminal 3 and the inhibit circuit INH, and each time the count value returns to 0, it generates a scan start signal "'1" to indicate that. is supplied to the AND circuit AND2.

Further, the count value of the counter C is supplied to the decoder D and the charge memory 4.

Decoder D is connected to switch S1. It is equipped with a plurality of output terminals connected to S2, .

Therefore, if any switch is closed, each time this switch is scanned, the first
A scanning signal "1" is supplied to the input terminal.

The price memory 4 stores the price of the article corresponding to each push button, and the price is sequentially read out and supplied to the comparison circuit 5 in synchronization with the scanning of each switch by the scanning device tha 2.

The comparison circuit 5 compares the input amount stored in the arithmetic circuit 6 with
The charge read out from the charge memory 4 is constantly compared with the charge, and if the former is higher than the latter, a sales permission signal "'1" to that effect is generated and supplied to the second input terminal of the AND circuit ANI)1.

The arithmetic circuit 6 counts and stores the amount of money each time a customer inserts money, and generates a counting start signal "1" each time counting starts, and this counting start signal "1" causes the flip-flops FF1. FF2 is reset, and a counting end signal "1" is generated each time counting ends, and the flip-flop FF1 is set by this counting end signal "1".

Therefore, the flip-flop FF1 is reset while the arithmetic circuit 6 is counting the input amount.

Furthermore, the flip-flop FF2 is reset until the counting process is completed and the count value of the counter C returns to O.

The set output of flip-flop FF1 is an AND circuit AN.
D2, and the output of the AND circuit AND2 is supplied to the set input of flip-flop FF2.

The set output of the flip-flop FF2 is then supplied to the third input terminal of the AND circuit AND1.

Therefore, the flip-flop FF2 is set when the counting process has been completed in the arithmetic circuit 6 and the count value of the counter C has returned to zero.

The AND circuit AND1 generates a signal "1" when each input signal is "1".

This signal is used as a signal to set the flip-flop FF3 and is also used as a release start signal, and the set output of the flip-flop FF3 is input to the inhibition circuit IN as a scan stop signal to stop scanning of the scanning device 2.
Supplied to H.

The inhibit circuit INH has an inhibit terminal that is a flip-flop FF.
Since it is connected to the set output terminal of the counter C, when the scanning stop signal is generated, the inhibit state is entered, and thereafter, the supply of clock pulses to the counter C is stopped until the flip-flop FF3 is reset.

In this device, the output signal of the comparator 5 is "0" before the counting process for the inserted coins, and the flip-flop FF2 is reset during the counting process. Does not generate start signal.

However, when the counting process is completed and the count value of counter C is 0,
When the switch returns, the flip-flop FF2 is set, so that if any push button is pressed, a sale start signal is generated when the switch corresponding to that push button is scanned by the scanning device 2.

Then, when the sale start signal is generated from the AND open circuit AND1, the supply of clock pulses to the counter C is stopped by the scanning stop signal, so that subsequent scanning of each switch by the scanning device 2 is interrupted.

Therefore, in this device, even if a customer inserts coins while pressing multiple push buttons, the sale start signal will not be generated until the count value of counter C returns to O after the counting process is completed, and after that, the scanning device will Since tha 2 starts scanning from switch S1, for example, if switches S1 and 82 are closed, a start signal will be generated when switch S1 is scanned, and if switches S2 and 83 are closed, a start signal will be generated. When the switch S2 is scanned, a sale start signal is generated.

In this way, according to the above device, even if the chitoe push button is pressed, it is considered invalid until the counting process for the inserted coins is completed and the count value of the counter C returns to O. No release start signal is generated, and after that each switch changes from S1 to S2. S3...Sn are scanned sequentially, so if you set the switch S1 side to a low denomination and the switch Sn side to a high value, if the customer presses multiple buttons and inserts money, the low denomination switch will be activated. It is scanned first so that it can be used as a low value priority device, or by reversing each switch it can be used as a high value priority device.

As described above, according to the present invention, one fixed contact of the push button switch is connected to the common input terminal of the logic circuit, and the other fixed contact is connected to the scanning device separately, so that it is different from the conventional device. There is no need to connect one fixed contact in series through the movable contact, and therefore the wiring work is easy.

Further, even if there is a cut in the wiring of each switch, the switch does not operate as if it were scanned, and therefore reliability is extremely high.

Furthermore, a first flip-flop is set by a counting end signal outputted from the arithmetic circuit and reset by a counting start signal, a scanning start point signal outputted from the scanning device each time the scanning device returns to O, and the first flip-flop The second flip-flop is set by an AND signal with the set output signal of the flip-flop, and is reset by the scan start signal.
Since the set output terminal of the second flip-flop is connected to the input terminal of the logic circuit, the scanning device returns to 0 while counting the inserted coins and afterwards. Until then, even if a push button switch is pressed, we have provided a means to disable it, so even if money is inserted with multiple push button switches pressed, it will operate as a low-value or high-value priority device. .

[Brief explanation of drawings]

The accompanying drawing is a block diagram showing one embodiment of the present invention. 1...--Push button switch group for selection, 2...
Scanning device, 4... Charge memory, 5...
Comparator, 6... Arithmetic circuit, C... Counter, D... Decoder, FF... Flip-flop, AND... AND circuit ,TNH
...Prohibition circuit, Sl...Sn...Switch.

Claims (1)

[Claims] 1. In a selected button push switch detection device for a vending machine, which sequentially scans a plurality of selection push buttons with a scanning device to detect the push button selected by a customer, each time a coin is inserted, A first circuit that counts and stores the amount is set by the counting end signal of the arithmetic circuit that outputs a counting start signal at the start of counting and outputs a counting end signal at the end of counting, and is reset by the counting start signal. A Noritsubu flop is set by an AND signal between a scan start point signal outputted from the scanning device and a set output signal of the first flip-flop each time the scanning device returns to 0, and is reset by the counting start signal. a second flip-flop; and a logic circuit having one input terminal connected to a set output terminal of the second flip-flop, the one-force fixed contact of each pushbutton switch being connected to another identical one of the logic circuit. C is connected in common to the input terminal, and the other fixed contact is connected to each of the scanning devices V separately, and furthermore, the output signal of the logic circuit is supplied to the scanning device as a scanning stop signal. Push button switch detection device.