JPH04330501A - Emergency stop device for controller in automatic working machine - Google Patents

Abstract

PURPOSE:To eliminate the malfunction of a controller due to artificial misses by automatically holding the commanding state of an emergency stop switch for the controller in an automatic working machine at the time of disconnecting the controller from the switch and omitting artificial judgement or operation. CONSTITUTION:The emergency stop switch 6 is electrically connected to the controller 1 through a switch commanding storing device 3 and an ON/OFF commanding signal from the switch 6 is transmitted to the controller 1. The device 3 is constituted of connecting a serial circuit consisting of a winding 12 of a communication relay 11 and the switch 6 and a serial circuit consisting of a winding 18 of a self-holding releasing relay 17 and a connector connection line 21 in parallel between power supply terminals 14, 15 and connecting a serial circuit consisting of a communication contact 13 of the relay 11 and a self-holding releasing braking contact 19 of the relay 17 in parallel with the switch 6.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an emergency stop device for a controller of an automatic processing machine such as an NC machine tool.

0002

[Prerequisite Structure] The emergency stop device for the controller of an automatic processing machine according to the present invention is premised on having the following prerequisite structure, as shown in FIG. 1 or 2, for example. That is, the stop command output circuit 7 of the emergency stop switch 6 in the operation box 5 is electrically connected to the emergency stop means 2 in the controller 1 of the automatic processing machine via the switch command holding device 3 and the switch connector 4 in this order. Connect to. The switch command holding device 3
are the switch command transmission circuit 8 and the switch command holding circuit 9.
Equipped with. This switch command transmission circuit 8 is configured to receive the ON/OFF command signal of the emergency stop switch 6 and transmit it to the emergency stop means 2. The switch command holding circuit 9 includes the switch command holding device 3.
On the other hand, when the emergency stop switch 6 is separated by the switch connector 4, the command state of the on/off command signal of the emergency stop switch 6 is maintained. This prerequisite structure is used as follows. For example, processing machines such as NC machine tools may be required to be stopped for safety reasons during maintenance or in the event of an abnormality. In this case, the emergency stop switch 6 is operated. Then, the emergency stop means 2 is activated and the processing machine is stopped via the controller 1. Furthermore, there are cases where it is desired to reduce the required number of operation boxes 5 by sequentially operating a plurality of controllers 1 with one operation box 5. In this case, the operation box 5 is connected to each controller 1 in turn. When the operation box 5 is disconnected from the controller 1 to which it was previously connected, the emergency stop means 2 of the controller 1 maintains the inoperative or activated state that was commanded by the emergency stop switch 6 immediately before disconnection, even after disconnection. It is necessary to keep it. The function of maintaining this switch command state is performed by the switch command holding device 3.

0003

2. Description of the Related Art In the above-mentioned prerequisite structure, as a structure of the switch command holding device 3, there is a structure shown in FIG. 2 in the prior art. That is, on the switch command transmission circuit 8, the switch command holding circuit 9 is connected in parallel with the emergency stop switch 6. This switch command holding circuit 9 is provided with an on/off changeover switch 9a.

0004

The above-mentioned prior art is used as follows. When the operation box 5 is disconnected from the controller 1 and the switch command holding device 3 at the switch connector 4, the emergency stop switch 5 is either in the on state or the off state. When the on-off state is on, the on/off changeover switch 9a is set to on, and when it is off, the on-off changeover switch 9a is set to off, and then the switch connector 4 is separated. This conventional technique has the following problems. (a) The worker must first check whether the emergency stop switch 6 is on or off, and then operate the on/off switch 9a accordingly. For this reason,
When separating the operation box 5, two preliminary operations are required: confirmation of the switch state and operation. (b) If you make a mistake in checking the on/off status of the emergency stop switch 6 or setting the on/off switch 9a,
The operation box 5 may be separated. In this case, the emergency stop means 2 malfunctions, causing the processing machine to stop unnecessarily or to be canceled without the user's knowledge. The problems of the present invention are as follows. When the operation box is disconnected, the emergency stop means automatically maintains a non-operating state or an operating state commanded by an emergency stop switch. This makes it possible to omit the preliminary work of checking the switch state and operating the switch at the time of disconnection.

[0005]

[Means for Solving the Problems] In order to achieve the above problems, the present invention has the above-mentioned premise structure, and the switch command holding device 3 is improved as follows, as shown in FIG. 1, for example. . (Invention 1) The switch command transmission circuit 8 includes the communication relay 1
1 winding 12 and a communication contact 13. This communication relay winding 12 is connected to the switch connector 4 between the power terminals 14 and 15 of the operating power source 10 of the switch command holding device 3.
and the emergency stop switch 6 in series. The communication contact 13 is interposed in the emergency stop means 2. The switch command holding circuit 9 includes a self-holding make contact 16 of the communication relay 11 and a winding 1 of the self-holding release relay 17.
8, a self-hold release break contact 19, a self-hold blocking connector 20, and a connector connection line 21. The self-holding make contact 16 and the self-holding release break contact 19 are interposed in series in the self-holding circuit 22 of the communication relay 11 between the power supply terminals 14 and 15. Further, the self-hold release relay winding 18, the self-hold blocking connector 20, and the connector connecting wire 21 are connected in series between the power terminals 14 and 15, and the connector connecting wire 21 is provided in the operation box 5. Configure. (Invention 2) The operating power source 10 is a direct current, and a relay off time delay capacitor 23 is connected in parallel to the winding 12 of the communication relay 11.

[0006]

[Operation] The first invention operates as follows, as shown in FIG. 1, for example. (A) When the emergency stop switch 6 is in the on state. When the emergency stop switch 6 is on, the switch command transmission circuit 8 is conductive, the winding 12 of the communication relay 11 is energized, the communication contact 13 thereof is activated, and the emergency stop means 2 is controlled. At this time, the emergency stop means 2 may be controlled to a non-operating state or to an operating state. For convenience of explanation, the following explanation will be given by taking as an example a case in which the controller is controlled to a non-operating state. Although the communication contact 13 is shown as a make contact in FIG. 1, it may be replaced with a break contact. (B) When the emergency stop switch 6 is in the OFF state. When the emergency stop switch 6 is turned off, the switch command transmission circuit 8 is cut off. Further, the winding 18 of the self-hold release relay 17 is energized, and the self-hold release break contact 19 is turned off to cut off the self-hold circuit 22. As a result, the communication relay winding 12 stops being energized, and
The communication contact 13 is deactivated and the emergency stop means 2 is activated.

(C) When the emergency stop switch 6 is on,
When the operation box 5 is separated. When the emergency stop switch 6 is in the on state, the switch command transmission circuit 8 becomes conductive, and the winding 12 of the communication relay 11 is energized, so that the communication contact 1
3 is activated, and the emergency stop means 2 is deactivated. When the operation box 5 is separated, the self-holding prevention connectors 20a and 20b are first removed, and the self-holding release relay 17 is disconnected.
The winding 18 stops energizing, and its self-hold release break contact 19 turns on. As a result, the self-holding circuit 22 becomes conductive, and the communication relay 11 is self-maintained in the energized state. Next, the switch connectors 4a and 4b are disconnected and the stop output circuit 7 of the emergency stop switch 6 is cut off, thereby cutting off the switch command transmission circuit 8. However, since the communication relay 11 is self-maintained in the energized state by conduction of the self-holding circuit 22, the emergency stop means 2 is held in the non-operating state via the communication contact 13. (D) When the emergency stop switch 6 is on and the operation box 5 is disconnected and then reconnected. If the operation box 5 is disconnected while the emergency stop switch 6 is on, the communication relay 1
1 is self-maintained in an energized state, and self-maintains the emergency stop means 2 in an inoperative state. When the operation box 5 is connected from this state, first, the switch connectors 4a and 4b are connected, and the switch command transmission circuit 8 is made conductive. Next, the self-holding prevention connectors 20a and 20b are connected,
The self-hold release relay winding 18 is energized to turn off the self-hold release break contact 19 and cut off the self-hold circuit 22. However, the communication relay winding 12 continues to be energized by the conduction of the switch command transmission circuit 8, and maintains the emergency stop means 2 in a non-operating state via the communication contact 13.

(E) When the emergency stop switch 6 is in the OFF state,
When the operation box 5 is separated. When the emergency stop switch 6 is in the OFF state, as explained in section (B) above, when the emergency stop switch 6 is OFF, the switch command transmission circuit 8 is cut off, and the self-hold release relay 17 is turned off. When the break contact 19 is turned off, the self-holding circuit 22 is cut off. Therefore, the communication relay winding 12 is de-energized and the emergency stop means 2 is activated. When the operation box 5 is disconnected from this state, the switch connectors 4a and 4b are disconnected, and the switch command transmission circuit 8 continues to be cut off. Moreover, when the self-holding make contact 16 of the communication relay 11 is turned off, the self-holding circuit 22 also continues to be cut off. Therefore, the communication relay winding 12 remains de-energized and the emergency stop means 2 is kept in the operating state. (F) When the emergency stop switch 6 is in the OFF state and the operation box 5 is disconnected and then reconnected. When the emergency stop switch 6 is in the OFF state and the operation box 5 is disconnected, as explained in section (E) above, the switch command transmission circuit 8 and the self-holding circuit 22 continue to be cut off, and the communication relay winding 12 is disconnected. The power supply is stopped, and the emergency stop means 2 is maintained in an activated state. When the operation box 5 is connected from this state, the switch command transmission circuit 8 is connected to the switch connector 4a.
・Emergency stop switch 6 is in the OFF state even if it is connected with 4b
continues to be blocked. Moreover, when the self-holding make contact 16 of the communication relay 11 is turned off, the self-holding circuit 22 also continues to be cut off. As a result, the communication relay winding 12 remains de-energized, and the emergency stop means 2 continues to be activated.

The operation of the second invention will now be explained. 1st above
In section (C) of the operation of the invention, when the emergency stop switch 6 is in the ON state and the operation box 5 is disconnected, in normal operation, the self-holding prevention connectors 20a and 20b are first disconnected, and then the switch connector 4a is disconnected.・4b can be removed. However, if a situation occurs where the switch connectors 4a and 4b come off first due to an erroneous operation or malfunction, the emergency stop means 2 will malfunction. That is, at the moment when the switch connectors 4a and 4b are disconnected first, the switch command transmission circuit 8 is cut off. At this time, the self-holding prevention connector 20a/2
Since 0b is still connected, the winding 18 of the self-hold release relay 17 is energized, turning off the self-hold release break contact 19 to cut off the self-hold circuit 22. As a result, the communication relay winding 12
energization stops, turning off the self-holding make contact 16. Immediately after this, self-holding prevention connector 2
0a and 20b are disconnected, the winding 18 of the self-hold release relay 17 stops energizing, and even if the self-hold release break contact 19 is turned back on, the self-hold make contact 1
6 remains off. Therefore, the self-holding circuit 22
is not energized, the winding 12 of the communication relay 11 is de-energized, and the emergency stop means 2 is erroneously activated via the communication contact 13. In order to eliminate this malfunction,
The second invention operates as follows. (G) Due to the above-mentioned erroneous operation or malfunction, the connector disconnection error time from when the switch connectors 4a and 4b come off first until the self-holding prevention connectors 20a and 20b come off later is extremely long. short. If the communication relay 11 does not stop energizing during this extremely short connector disconnection error time, the above-mentioned malfunction of the emergency stop means 2 will not occur. Therefore, a relay off time delay capacitor 23 is connected in parallel to the communication relay winding 12. This relay-off time delay capacitor 23 is charged by the DC operating power source 10 while the operation box 5 is not yet disconnected and the emergency stop switch 6 is in the on state. When the operation box 5 is disconnected, the charged charge is transferred to the communication relay winding 12.
released into the As a result, the communication relay winding 12 is kept energized by the discharge current of the relay-off time delay capacitor 23 for a period longer than the connector disconnection error time, and the self-holding make contact 16 continues to be turned on. Then, when the self-holding blocking connectors 20a and 20b are disconnected, the winding 18 of the self-holding release relay 17 stops energizing, and the self-holding releasing break contact 19 is turned back on. At this time, since the self-holding make contact 16 is still on, the self-holding circuit 22 becomes conductive, the winding 12 of the communication relay 11 continues to be energized, and the emergency stop means is connected via the communication contact 13. 2 is held properly in the inoperative state.

0010

[Effects of the Invention] The present invention 1 is constructed and operates as described above, and thus has the following effects. (B) As explained in paragraphs (C) and (D) of the (effect) column above, when the operation box 5 is disconnected from the controller 1 and the switch command holding device 3, the emergency stop switch 6 commanded The non-operation or operation state of the emergency stop means 2,
The switch command holding device 3 automatically holds the command. As a result, when the operation box 5 is disconnected, the emergency stop switch 6 and the on/off switch 9, which were necessary in the prior art, can be removed.
Perform the two preliminary tasks of checking the switch status and operating the switch in a.
Can be omitted. (b) Moreover, when the operation box 5 is disconnected, it is no longer necessary to check and operate the switch status, which was necessary in the conventional technology, so that the emergency stop means 2 may be activated due to a mistake in checking or operating the switch status. It is possible to prevent the processing machine from malfunctioning and causing the processing machine to stop unnecessarily or to be canceled without realizing it. In addition to the above effects (a) and (b) of the first invention, the second invention also provides the following effect (c). (C) As mentioned in item (G) of the (effect) column above, when the operation box 5 is disconnected with the emergency stop switch 6 in the ON state, the self-retention blocking connector 20a may be damaged due to erroneous operation or malfunction. Switch connector 4 than 20b
It is conceivable that a situation may occur where a and 4b come off first. In this case, even if the switch command transmission circuit 8 is cut off by the switch connectors 4a and 4b, the discharge current of the relay-off time delay capacitor 23 continues to energize the winding 12 of the communication relay 11, so the emergency stop occurs. Malfunction of means 2 can be prevented.

[0011]

Embodiments Hereinafter, embodiments of the present invention will be explained with reference to the drawings. FIG. 1 is a wiring diagram of an emergency stop device of a controller of an automatic processing machine. In the figure, a stop command output circuit 7 of an emergency stop switch 6 in an operation box 5 is electrically connected to an emergency stop means 2 in a controller 1 of an automatic processing machine via a switch command holding device 3 and a switch connector 4 in that order. It is connected to The switch command holding device 3 includes a switch command transmission circuit 8 and a switch command holding circuit 9. This switch command transmission circuit 8 is configured to receive an on/off command signal for the emergency stop switch 6 and transmit it to the emergency stop means 2. The switch command holding circuit 9 then connects the emergency stop switch 6 to the switch connector 4 with respect to the switch command holding device 3.
When the emergency stop switch 6 is separated, the command state of the on/off command signal of the emergency stop switch 6 is maintained. The switch command holding device 3 is not an electronic circuit, but is a simple circuit using a relay that is resistant to external noise and has high reliability, and has the following configuration. (Invention 1) The switch command transmission circuit 8 includes a winding 12 of a communication relay 11 and a communication contact 13. This communication relay winding 12 is connected in series with the switch connector 4 and the emergency stop switch 6 between the power supply terminals 14 and 15 of the operating power supply 10 of the switch command holding device 3. The communication contact 13 is connected to the emergency stop means 2.
It is mediated by Further, the switch command holding circuit 9 includes a self-holding make contact 1 of the communication relay 11.
6. Winding 18 of self-holding release relay 17, self-holding release break contact 19, self-holding blocking connector 20,
and a connector connection line 21. Also, the make contact 16 for self-holding and the break contact 19 for releasing self-holding.
are interposed in series in the self-holding circuit 22 of the communication relay 11 between the power supply terminals 14 and 15. The self-hold release relay winding 18, self-hold blocking connector 20, and connector connecting wire 21 are connected in series between the power terminals 14 and 15, and the connector connecting wire 21 is provided in the operation box 5. Configure.

(Invention 2) In the above invention 1, the operating power source 10 is a direct current, and the winding 1 of the communication relay 11
2 is connected in parallel with a capacitor 23 for delaying relay off time.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the present invention and is a wiring diagram of an emergency stop device of a controller of an automatic processing machine.

FIG. 2 is a diagram showing a conventional example and corresponding to FIG. 1;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1...Controller, 2...Emergency stop means, 3...Switch command holding device, 4...Switch connector, 5...Operation box, 6
...Emergency stop switch, 7...Stop command output circuit, 8...Switch command transmission circuit, 9...Switch command holding circuit, 10...
Operating power supply, 11...Communication relay, 12/18...Winding, 1
3...Communication contact, 14/15...Power terminal, 16...Self-holding make contact, 17...Self-holding release relay, 19...
Break contact for self-holding release, 20... Self-holding blocking connector, 21... Connector connection wire, 22... Self-holding circuit,
23...Relay off time delay capacitor.

Claims (2)

[Claims] [Claim 1] A switch command holding device (3) is installed in the emergency stop means (2) in the controller (1) of an automatic processing machine.
and the switch connector (4) in order, then connect the operation box (
5) Stop command output circuit of the emergency stop switch (6) (
7) and its switch command holding device (3).
) includes a switch command transmission circuit (8) and a switch command holding circuit (9), and this switch command transmission circuit (8)
is configured to receive the on/off command signal of the emergency stop switch (6) and transmit it to the emergency stop means (2), and the switch command holding circuit (9) is configured to receive the on/off command signal of the emergency stop switch (6), and the switch command holding circuit (9) is configured to receive the on/off command signal of the emergency stop switch (6) and transmit it to the emergency stop means (2). The above emergency stop switch (6
) is separated using the above switch connector (4),
In the emergency stop device for the controller of an automatic processing machine configured to hold the command state of the on/off command signal of the emergency stop switch (6), the switch command transmission circuit (8) is connected to the winding of the communication relay (11). This communication relay winding (1
2) is an operating power source (
Connect the switch connector (4) and the emergency stop switch (6) in series between the power terminals (14 and 15) of 10),
The communication contact (13) is interposed in the emergency stop means (2), and the switch command holding circuit (9) is connected to a self-holding make contact (16) of the communication relay (11) and a self-holding release contact. The relay (17) has a winding (18), a self-holding release break contact (19), a self-holding blocking connector (20), and a connector connecting wire (21), and the self-holding make contact (16) and The self-holding release break contact (19) is a contact between the power supply terminals (14 and 15),
The self-holding release relay winding (1) is interposed in series in the self-holding circuit (22) of the communication relay (11).
8) The self-holding prevention connector (20) and the connector connection line (21) are connected in series between the power terminals (14 and 15), and this connector connection line (21) is provided inside the operation box (5). An emergency stop device for a controller of an automatic processing machine, characterized in that the controller is configured as follows. 2. The operating power source (10) is a direct current,
The emergency stop device for a controller of an automatic processing machine according to claim 1, characterized in that a relay off time delay capacitor (23) is connected in parallel to the winding (12) of the communication relay (11).