JP2553672B2 - Coin operated washing machine - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coin-type washing machine that automatically operates a program including a series of steps such as washing, rinsing, and dehydration by inserting coins.

2. Description of the Related Art Conventionally, as shown in FIG. 3, a coin-type washing machine of this type has a closed circuit composed of a power source 1, two-way thyristors 2, 3, and 4, a water supply valve 5, a drain valve 6, and a motor 7. Control power circuit 8
The bidirectional thyristors 2 to 4 are driven by the control means 9 such as a microcomputer, which is operated by the power source, and performs a series of steps such as washing, rinsing, and dehydrating.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in such a configuration, since there is no switch or the like in the closed circuit formed by the power source 1, the bidirectional thyristors 2 to 4 and the loads 5 to 7, both are operated even when not in operation. The power remains applied to the directional thyristor. In the case of the coin-type washing machine, unlike the household type, the power outlet is always plugged in, and there is a problem that the bidirectional thyristor deteriorates especially when the humidity becomes high.

Therefore, an object of the present invention is to provide a coin-type washing machine having a function of protecting a bidirectional thyristor when not in use.

Means for Solving the Problems To achieve the above object, the coin-type washing machine of the present invention is
A switch is provided in a closed circuit consisting of a power supply, a load, and a bidirectional thyristor for driving the load, and this switch is closed when the coin is inserted up to a set amount of money, and opened when the entire process is completed. It is a structure provided with means.

With the above-described structure, the coin-type washing machine of the present invention closes the switch and energizes only until the user inserts coins to start washing and completes all steps, and in other cases, Therefore, no voltage is applied to the bidirectional thyristor.

Example Hereinafter, one example of the present invention will be described with reference to the accompanying drawings. In FIG. 1, reference numeral 10 is a power source, which is converted into a control DC power source by a transformer 11 and a rectifying / smoothing circuit 12. In addition, power supply 10, bidirectional thyristors 13 to 15, water supply valve 16, drain valve 1
7. A closed circuit is formed by the load of the motor 18 and the contact 20 of the relay 19 which is a switch. Reference numeral 21 is a control means such as a microcomputer, which is a coin SW (switch)
While inputting the signal from 22, the signal is output to the LED display 23, the exciting coil 24 of the relay 19, and the bidirectional thyristors 13 to 15. The signal from the start switch (switch) 25 is also input.

Explaining the operation of this configuration, first, at the time of expectation before coin insertion, since the DC power to the control means 21 is always supplied, it is possible to give an indication to the LED display 23 that it is expecting, The throwing point 20 of the relay 19 is in a closed state, and no voltage is applied to the bidirectional thyristors 13 to 15. When user inserts coin, coin SW22
Signal is input from the control means 21 to the control means 21, and when the set amount of money is reached, an indication to that effect is output to the LED display 23, and the energizing coil 24 of the relay 19 is energized to close the contact 20 for the first time. A voltage is applied to the sex thyristors 13-15.

Next, the process is started by the user operating the start SW 25, and the control means 21 controls the bidirectional thyristor 13
By sending signals to 15 to 15 in accordance with the process sequence, the water supply valve 16, the drain valve 17, and the motor 18 are operated in a timely manner, and the process is operated. Then, after the completion of all the processes, the energization of the exciting coil 24 of the relay 19 is terminated after the operation of all the loads is terminated, the contact 20 is also opened, and the contact 20 is kept opened until the next coin is inserted. Wait.

FIG. 2 shows the timing of the above embodiment. That is, the relay 19 is turned on after the coin SW22 is inserted (the coin is inserted), the load is turned on after the start SW25 is inserted, and the load is turned off at the end when the relay is turned off. Become. In this way, the relay is turned on and energized only while the load is actually operating.

EFFECTS OF THE INVENTION As described above, according to the present invention, the switch is closed only during actual use from the coin insertion to the end of the process, the bidirectional thyristor is energized, and the energization is not performed during other waiting periods. By so doing, the energization time to the bidirectional thyristor can be shortened, and its deterioration and the deterioration of reliability due to it can be prevented. In addition, since the contact of the relay is all opened and closed when the bidirectional thyristor is OFF, no arc is generated at the contact of the relay, and problems due to the arc can be prevented.

[Brief description of drawings]

FIG. 1 is a block circuit diagram showing a control device for a coin-type washing machine according to an embodiment of the present invention, FIG. 2 is a timing chart thereof, and FIG. 3 is a block diagram showing a conventional coin-type washing machine. 13,14,15 …… Bidirectional thyristor, 16 …… Water supply valve, 17…
… Drain valve, 18 …… motor, 19 …… relay, 20 …… relay contact, 21 …… control means.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kuniaki Nagayasu 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Yoshitoyo Miki 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Sangyo Co., Ltd.

Claims (1)

(57) [Claims] 1. A control means for executing a program including steps such as washing, rinsing and dehydrating after inserting a coin, and a bidirectional thyristor for driving loads such as a water supply valve, a motor and a drain valve by the control means. A switch provided in a closed circuit consisting of the load, a bidirectional thyristor and a power supply,
The coin-type washing machine configured such that the control means closes the switch when a coin is inserted up to a set amount, and opens the switch when all steps are completed.