JPH0431656Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention is designed to activate an alarm device such as a buzzer installed inside the machine when the front door of the cabinet is illegally opened during vending machine sales. The present invention relates to a maintenance switch mechanism in a theft prevention alarm circuit which is configured to emit an alarm.

[Conventional technology]

As one of the anti-theft measures for vending machines, there is a known anti-theft alarm circuit which activates an alarm such as a buzzer installed inside the machine to issue an alarm if the front door of the cabinet is illegally opened during vending machine vending machine. It is. FIG. 4 shows the basic circuit of the theft prevention alarm circuit that has been conventionally implemented. In the figure, 1 is an alarm such as a buzzer installed inside the aircraft.
The power supply circuit includes a door switch 2 which is connected in series with the alarm 1 and closes the contact in conjunction with the opening of the door, and a door key switch 4 which opens the contact in conjunction with the unlocking operation of the door key 3.
A maintenance switch 5 with a residual contact that opens the contact manually during in-machine maintenance is inserted.

In this anti-theft alarm circuit, under normal sales conditions, the contacts of the door switch 2 are open and the door key switch 4 is open.
The contact of the maintenance switch 5 is closed, and if the door is illegally opened by mischief, the contact of the door switch 2 will close, and the alarm 1 will automatically operate to issue an alarm. ing. Further, when the door is opened by properly unlocking the door key 3 during maintenance work such as inspecting the inside of the machine, the door key switch 4 is opened, and the alarm 1 is in an inactive state. In addition, when removing the door key while the door is open in order to move on to maintenance on another vending machine during maintenance work, manually operate the maintenance switch 5 to open the contacts and remove the key. However, the alarm device 1 remains inactive and will not issue an alarm inadvertently.

[Problem that the invention attempts to solve]

By the way, in the above-mentioned conventional theft prevention alarm circuit, a switch with a residual contact that is manually opened and closed is employed as the maintenance switch 5. For this reason, after maintenance work is completed, if you forget to return the maintenance switch and close the door with the switch open, then lock the door key and switch to sales status, in the unlikely event that the door is opened illegally due to mischief. If the door is forcibly opened, the contact point of the maintenance switch 5 remains open, resulting in a problem in which the alarm 1 does not operate even if the door switch 2 operates normally.

The purpose of this invention is to create a structure in which, even if you forget to return the maintenance switch that was manually opened during maintenance work, the maintenance switch will automatically return and close its contacts when the door is closed. Accordingly, it is an object of the present invention to provide a maintenance switch mechanism for an anti-theft alarm circuit which solves the above-mentioned conventional problems.

[Means for solving problems]

In order to solve the above problems, according to this invention, a maintenance switch inserted in the burglar alarm circuit is manually opened, and the contact returns to the closed position in conjunction with the closing operation of the cabinet front door. It is configured as a locked manual release/automatic return type switch.

[Effect]

With the above configuration, even if the maintenance switch is manually opened during in-flight maintenance work and you forget to close the contact at the end of the maintenance work, closing the door will allow the maintenance switch to open automatically via the operating rod and actuator. The maintenance contact automatically returns to close, and the actuator is locked in the contact closed position.
Therefore, even if you forget to manually reset the maintenance switch, the anti-theft alarm circuit will always function normally and issue an alarm if the door is illegally opened at the time of sale.

〔Example〕

Figures 1 to 4 show the structure of a maintenance switch mechanism according to an embodiment of this invention, in which 6 is a micro switch as a maintenance switch, and 7 is a front door of the cabinet that opens and closes in the direction of arrow A. It is. Here, the switch mechanism including the micro switch 6 is installed on the front side of the cabinet (not shown) facing the door 7, and a mounting frame 8 supports the micro switch 6 with the contact point facing rearward at this position. , an operating rod 9 supported so as to be movable back and forth in the directions of arrows B and C with respect to the frame 8, and a micro switch 6.
a contact actuator 10 in the form of a strip plate integrally connected on the axis of the operating rod 9 facing the contact point of the frame 8; 8 and actuator 10
It is configured as a combination body with a coil-shaped biasing spring 12 stretched between. In addition, the stepped locking piece 11 has an actuator 1 at its rear.
0 form an engaging stepped portion 11a that falls down and engages with each other, and while a biasing spring 12 constantly presses and biases the operating rod 9 together with the actuator 10 forward, the actuator 10 is simultaneously pressed against the chain. The operating rod 9 is biased to apply a clockwise twisting force so as to press against the lock piece 11.

Next, the operation of the actuator switch mechanism having the above configuration will be explained. The figure shows a state in which the door 7 is opened and the operating rod 9 is manually pulled forward to open the contact point of the micro switch 6 during maintenance work. When the door 7 is closed due to the completion of maintenance work in such a state, the back side of the door 7 hits the tip of the operating rod 9 in the middle of closing, and the operating rod 9 is closed together with the actuator 10.
is moved backward against the biasing spring 12. This movement operation causes the actuator 10 to separate rearward from the contact point of the micro switch 6, and at the same time, the actuator 10 disengages from the engaging stepped portion 11a of the locking piece 11.
When the actuator 10 moves back by a distance L1 to reach the position shown in FIG. It falls into the engagement stepped portion 11a of the lock piece 11. From here, it is further pushed into the door 7 and retreats within a distance L2.
As a result, the microswitch 6 automatically returns to close its contact point, and at the same time, the actuator 10 moves backward and rotates to engage with the locking piece 11.

Therefore, when the door 7 is opened from the above state, the restraint by the door 7 is released and the operating rod 9 is pushed forward and urged by the pressing force of the urging spring 12, but the actuator 10 is pressed against the locking piece 11. It is locked by the engagement step portion 11a, and further advancement is prevented. Therefore, the microswitch 6 continues to keep its contacts closed.

Micro switch 6 due to maintenance work
To open the contact, grasp the tip of the operating rod 9 with your hand,
The operating rod 9 is twisted counterclockwise against the twisting force of the biasing spring 12. By this manual operation, the actuator 10 is disengaged from the engagement stepped portion 11a of the locking piece 11, and is moved to the illustrated contact opening position by the pressing force of the biasing spring 12.

As is clear from the above explanation, even if you manually open the maintenance switch after opening the door during maintenance work inside the machine and forget to manually return the switch contact to closed, the front door of the cabinet cannot be closed. The maintenance switch automatically returns to its original state and closes its contacts. Therefore, if the front door of the vending machine is forcibly opened while the vending machine is in a vending state, the theft prevention alarm circuit shown in FIG. 4 will surely operate.

[Effects of the invention] As described above, according to this invention, the contact of the maintenance switch inserted in the burglar alarm circuit, which is manually opened, returns to the closed position in conjunction with the closing operation of the door, and locks the maintenance switch. By using a manual release/automatic return type switch that is locked, it is possible to compensate for forgetting to return the maintenance switch, and to ensure that an anti-theft alarm circuit is activated when the door is illegally opened while the vending machine is on sale. It is possible to improve its reliability.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a maintenance switch mechanism according to an embodiment of the present invention, Figs. 2 and 3 are a front view and a side view of Fig. 1, respectively, and Fig. 4 is a diagram of a conventional burglar alarm circuit. It is a basic circuit diagram. In each figure, 1... alarm device such as a buzzer, 2...
...Door switch, 3...Door key, 4...Door key switch, 5...Maintenance switch, 6...Micro switch as maintenance switch, 7...Door, 8...Mounting frame, 9...Operation rod ,1
0...Contact actuator, 11...Stepped locking piece, 11a...Engaging stepped portion, 12...Biasing spring, A
...Opening/closing direction of the door, B...Direction of forward/backward movement of the operating lever, C... Direction of rotation of the operating lever.

Claims (1)

[Scope of utility model registration request] In a theft prevention alarm system for a vending machine, which is equipped with an alarm such as a buzzer, and which closes the power supply circuit of the alarm and issues an alarm when the front door of the cabinet is illegally opened, the circuit is closed when the door is in the open position. A door switch equipped with a first contact that opens when the door is in the closed position, and a locked position that opens when the door key cannot be removed in the unlocked position that is linked to the unlocking operation of the door key and allows the door key to be removed. Here, we have a door key switch equipped with a second contact that closes the circuit, and when the door is in the closed position, the circuit is forced to close, and when the door is in the open position, the forced circuit is released and the circuit can be opened manually, and after the manual operation, the circuit is in the open state in the door open position. a maintenance switch having a third contact for maintaining the
An anti-theft alarm device for a vending machine, characterized in that the contacts are inserted in series with each other in a power supply circuit of the alarm.