JPS6044691A - Control circuit for safety of operating button - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] The present invention relates to an operation button circuit for driving a press machine,
This prevents the press from operating even if someone 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. Small machines are not so dangerous because you can see the whole machine, but with large machines, the worker may be working between the slide and the bolster, and the worker may not be visible from the outside. be. Needless to say, it is extremely dangerous if someone accidentally presses the operation button 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.

For this reason, 1 the present invention provides each worker with a magnetic card with a different magnetized part, and prevents the operator from operating even if the operation button is pressed 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, reference numeral 1 denotes an operation button box, which has an operation button 2.3 and an emergency stop button 4, as well as a magnetic card socket 6 into which a magnetic card 5 can be inserted. The magnetic card 5 is provided with four strip-shaped magnetic materials 5a to 5d. Either of these
Alternatively, a magnetic card with a plurality of combined locations magnetized is handed to the worker. That is, in the case of this embodiment, since the card has a 4-bit configuration in which four different locations can be magnetized, cards with different magnetized locations can be given to 15 workers.

Further, the magnetic card socket 6 is provided with four reed switches 7a to 7d as a magnetic detection unit that detects the magnetized location of the magnetic material and outputs different outputs depending on the magnetized location. Those that correspond to magnetic materials work,
It is configured to be on. Each reed switch 7
A to 7d are four relays 8a to 8 that constitute a control circuit.
d is connected.

As shown in the figure, the contacts of the relays 8a to 8d described above are connected between each of the 15 relays 8a to 9n constituting the relay group and the jumper terminals 10a to 10rt. One of the four contacts in series 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 of four relays, or a jumper terminal and one relay 8a to 9n may be connected in series at the bottom of the tree.

Further, it goes without saying that the relays 88 to 8d that operate one relay in the second group of relays may be constructed using a semiconductor element or the like. The contacts of these relays 10a to IOn are all connected in parallel as shown in Figure 3, and are connected in series to the operation button 2.3.The jumper terminals 10a to 10n are connected to the person in charge (supervisor). is used to short-circuit one of the magnetic cards 5 of the worker that day. Now, the person in charge has connected the jumper to the terminal 10a connected to the relay 9a, as shown in the figure.
Assume that it is short-circuited.

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 the 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 88 and turning on the relay 9a.

Pressing the run button 2.3 activates the press. However, if a person holding a card with the magnetic body 5b magnetized with the jumper terminal in the state shown in the figure accidentally inserts it into the magnetic card socket 6 and presses the operation button 2.3, the magnetic body 5b may Since the reed switch 7b operates and the relay 8b operates, the relay 9a does not operate, and since none of the other jumper terminals 10b to 1゜n are shorted, the relay 8a of the second relay group ~8
n does not operate, and the press does not operate after all.

As described above, according to the present invention, unless the person in charge inserts a magnetic card with a magnetized magnetic substance into the magnetic carton get so that the relay corresponding to the short-circuited jumper terminal operates, even if the operation button is pressed. Since the press will not operate even if pressed, if the operator removes the magnetic card before entering the press, it will be extremely safe as there will be no chance of someone accidentally operating the press.

[Brief explanation of the drawing]

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 10
a~10n... Jumper one terminal patent applicant AIDA Engineering Co., Ltd. agent
Patent attorney Kiyoshi Nakayama (and 1 other person) Figure 7 R Buno/n Fuhe Figure 3

Claims (1)

[Claims] A magnetic card having 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 connected in parallel to each other,
and it is connected between a plurality of relays connected in series to the operation button, a jumper terminal that corresponds to each relay and selects the relay to be operated, and an individual jumper terminal, and the magnetic detection Depending on the output of
This is a safety control circuit for driving potages, which is comprised of a control circuit that electrically connects each jumper terminal and its corresponding relay, and prevents connections between other jumper terminals and relays.