JPS5816231B2 - Vending machine control circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control circuit for a vending machine. For example, when selling a product (and when the power is turned on and off), the solenoid that controls product sales is energized several times and This is to prevent sales from occurring.

Generally, control circuits in vending machines that use solenoids as drive mechanisms have a timer to determine the energization time of the solenoid, but off-delay relays that are usually a combination of relays, sensors, and resistors are used. .

However, if the off-delay relay is turned off and on due to an abnormality in the power supply state, for example, due to recovery from a power failure or when the power plug is inserted or removed, the solenoid follows and operates twice.

To explain the conventional example of the control circuit shown in FIG.
0 is a currency sorting and counting mechanism (hereinafter referred to as a coin mech), TD is an off-delay relay, Xl is a sales relay, S is a solenoid, and TD.

TD2 is the contact point of off-delay relay TD, X11°X1
□, X, and 3 are the contacts of the sales relay X1.

When a sales permission signal is issued from terminal 3 of coin mech 10, the terminal 3, off-delay relay TD, and contact Xll are energized, and off-delay relay TD is energized and self-held by its own a contact TD1.

Next, when the product selection switch PB is pressed, power supply terminal 7 of the price setting switch of Coin Mech 10, contact TD2, switch PB, and contact X1 are energized, and the sales relay X1 is energized and self-held by its own a contact X12. As soon as the circuit is formed, the b contact X'11 of sales relay Solenoid S is energized via a contact X13, and sales are started.

When the off-delay relay TD completes its delay and turns off, the sales relay X1 also turns off, the solenoid is also de-energized, and the sale ends.

In this series of operations, when the power is turned off and on while the off-delay relay TD is delaying, the solenoid S follows the same operation and operates twice.

Therefore, there was a drawback that double sales were carried out.

The present invention has been developed from this point of view, and even if there is an abnormality in the power supply during the delayed operation of the off-delay relay TD, sales will be terminated when the power is turned on again from off, and only the delayed operation of the off-delay relay TD will be terminated. The circuit configuration prevents the solenoid from operating twice.

For this purpose, off-delay relay TD in conventional control system
To solve the problem caused by the time delay, add an element (for example, an A CIJ relay) that follows instantaneous power on and off, and supply power to that element through its own contacts and the contacts of the off-delay relay TD. This is achieved by operating a sales relay through the element to drive a solenoid.

The circuit configuration will be described below with reference to the embodiment shown in FIG.

In Fig. 2, when a sales permission signal is output from terminal 3 of coin mech 10, auxiliary relay X2 is first energized, and off-delay relay TD is energized through its a contact X21 and b contact Auxiliary relay X2 and off-delay relay TD form a self-holding circuit via a contact TD1 of TD.

However, when the sales relay X1 is energized, the product selection switch PB is
Self-A contact X1□ falls to operate when is pressed.
In this case, the sales relay
It is configured to drive a solenoid through a contact X13 to perform sales.

That is, when a sales permission signal is output from CoinMech 10, terminal 3
- The auxiliary relay X2 is energized, and the terminal 3, the contact X2□, the off-delay relay TD, and the contacts X and 1 are energized, and the auxiliary relay X2 is self-maintained by the circuit of the contact TD1, the contact X21, and the auxiliary relay X2.

Off-delay relay TD is also self-maintained by a circuit consisting of contact TD1, off-delay relay TD, and contact Xll.

Here, when the product selection switch PB is pressed, the power terminal 7-
Contact X2□ - switch PB - energizes sales relay X1, and sales relay X1 connects power terminal 7 - contact X22 - contact X
1□-Self-maintained by sales relay X1.

Also, since contact X1 is opened, off-delay relay TD is cut off and delay operation is started.

Solenoid S is energized by contact X13, and when the delay operation of off-delay relay TD is completed, auxiliary relay X2 and sales relay X1 are released from self-holding, and solenoid S
The power will also be cut off.

In this series of operations, when the power is turned on-off-on while off-delay relay TD is performing a delay operation, relay X1. For both X2, self-holding is canceled when the power is once turned off, and when the power is turned on again, the sale ends and only the delay operation of the off-delay relay TD is performed.

Therefore, solenoid S does not operate twice.

In other words, double sales are prevented. Note that the contact SS in the figure is a sell-out detection switch, and the terminal 6 is a side leg input terminal that controls the operation of the coin mech at the time of sale or sell-out.

Here it is! By adding the auxiliary relay of CL and configuring the circuit as described above, it is possible to easily prevent double sales in the event of a power failure.

The present invention is not limited to the embodiments, and for example, the duration of the sales permission signal is a pulse long enough to excite the auxiliary relay X2 and the off-delay relay TD, or Of course, the design of the excitation circuit etc. of the off-delay relay TD may be changed depending on whether the selection switch PB is turned on or off when the selection switch PB is operated.

[Brief explanation of the drawing]

FIG. 1 is an open side circuit diagram of a conventional vending machine, and FIG. 2 is a control circuit diagram of the vending machine according to the present invention. Identical parts in FIG. 1 and FIG. 2 are designated by the same reference numerals. 10; Currency sorting and counting mechanism, TD; Off-delay relay,
Xl: Sales relay, X2: Auxiliary relay, S: Solenoid, PB: Product selection switch.

Claims (1)

[Claims] 1. An auxiliary relay that is energized by a sales permission signal from the goods sorting and counting mechanism, and when the auxiliary relay is energized, when the product selection switch is operated, the first a contact of the auxiliary relay and the product selection switch are activated. A sales relay is energized by the power supply through the product selection switch and forms a self-holding circuit by its first a contact with respect to the product selection switch, and when the sales relay is energized, the sales relay's second Power is supplied from the power supply through the a contact point, and the product transport mechanism transports the product, and when the auxiliary relay is energized when the sales relay is de-energized, the second auxiliary relay
an off-delay relay that is energized by the sales permission signal through the a contact of the relay and the b contact of the sales relay, and forms a self-holding circuit with the a contact of the relay itself and the b contact of the sales relay; The auxiliary relay is connected to the second
A control circuit for a vending machine, characterized in that a self-holding circuit is formed through the a-contact of the off-delay relay and the a-contact of the off-delay relay.