JPS646879B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an operation button circuit for driving a press machine, and is designed to prevent the press from operating even if a person other than the operator presses the operation button.

As long as the press machine is powered on and ready for operation, it will operate as long as the operation button is pressed, even if a person other than the operator presses the button. With small machines, you can see the whole thing, so it's not that dangerous, but
In the case of large-sized machines, the worker may be working between the slide and the bolster, and the worker may not be visible from the outside. Needless to say, it is extremely dangerous if someone presses the operation button by mistake in such a case.

The present invention aims to avoid such danger. That is, the object is to provide a run button circuit that does not operate unless the operator presses the run button.

Therefore, in the present invention, each worker is given a magnetic card with a different magnetized part, and the operation button is not activated unless the magnetic card is inserted, while the person in charge (supervisor) This allows only the magnetic cards of workers in the field to be valid.

The specific circuit configuration thereof will be explained below based on the illustrated embodiment.

In Fig. 1, 1 is an operation button box, which has operation buttons 2 and 3 and an emergency stop button 4.
A magnetic card socket 6 into which a magnetic card 5 can be inserted is provided. The magnetic card 5
, there are four magnetic materials 5a to 5d formed in a band shape.
is provided. A magnetic card with one or more of these locations magnetized is handed to the worker. In other words, in the case of this example, a 4-bit configuration that can magnetize four different locations is used.
Cards with different magnetized parts can be given to 15 workers.

Further, the magnetic card socket 6 is provided with four reed switches 7a to 7d as magnetic detection sections that detect the magnetized portion of the magnetic material and output different outputs depending on the magnetized portion, and detect the magnetized magnetic material. The device is configured to operate and turn on. Four relays 8a-8d forming a control circuit are connected to each reed switch 7a-7d.

As shown in the figure, the contacts of the relays 8a to 8d described above are connected to the 15 relays 9a to 9 that make up the relay group.
n and each of the jumper terminals 10a to 10n. Of these 44 contacts in series, one is a make contact and the other is a break contact, and the make contacts in each circuit are configured so that there are no identical combinations. The contact structure of the relays 8a to 8d may be a tree circuit including four relays, or a jumper terminal and one relay 9a to 9n may be connected in series at the bottom of the tree.

Further, it goes without saying that the relays 8a to 8d that operate one relay in the second relay group may be constructed using a semiconductor element or the like. The contacts of these relays 10a to 10n are all connected in parallel as shown in FIG. 3, and connected in series to the operation buttons 2 and 3.

A person in charge (supervisor) short-circuits one of the jumper terminals 10a to 10n depending on the magnetic card 5 of the worker that day. It is now assumed that the person in charge has short-circuited the jumper terminal 10a connected to the relay 9a, as shown in the figure.
In this circuit, as shown in the figure, only the contacts of relay 8a are made, and the others are broken. Relay 8a is operated only by reed switch 7a. Therefore, when a person holding a magnetic card 5 in which only the magnetic body 5a is magnetized inserts the card into the magnetic card socket 6, the reed switch 7a is turned on, operating the relay 8a and turning on the relay 9a.

Press operation buttons 2 and 3 to operate the press.
However, if a person holding a card with magnetized magnetic material 5a accidentally inserts it into the magnetic card socket 6 and presses the operation buttons 2 and 3 while the jumper terminal is in the state shown in the figure, the magnetic material 5b Since reed switch 7b operates and relay 8b operates, relay 9a does not operate, and since none of the other jumper terminals 10b to 10n are short-circuited, relay 9 of the second relay group
None of a to 9n operate, and the press does not operate after all.

As described above, according to the present invention, even if the operation button is pressed, unless the person in charge inserts a magnetic card with a magnetized magnetic material into the magnetic card socket so that the relay corresponding to the short-circuited jumper terminal operates. Since the press never works,
If the operator removes the magnetic card before entering the press, it will be extremely safe to prevent anyone else from accidentally operating the press.

[Brief explanation of drawings]

Figure 1 shows the top view A and side view B of the operation button box.
FIG. 2 is a circuit diagram of the control section of one embodiment, and FIG. 3 is a circuit diagram of the operation button part. 2, 3... Operation button, 5... Magnetic card, 6
...Magnetic card socket, 7a-7d...Reed switch, 8a-8d...Relay, 9a-9n...
...Relay, 10a-10n...jumper terminal.

Claims (1)

[Claims] 1. A magnetic card that has two or more magnetic materials that magnetize different locations, a magnetic detection section that detects and outputs the magnetized locations of the magnetic card, and contacts that are connected in parallel to each other and that are connected to the operation button. A jumper terminal is connected between a plurality of relays connected in series to each relay, a jumper terminal corresponding to each relay and selecting a relay to be operated, and a jumper terminal is connected between each jumper terminal, and the output of the magnetic detection unit A safety control circuit for an operation button, comprising a control circuit that electrically connects one jumper terminal and a corresponding relay, and prevents connections between other jumper terminals and relays.