JPH0311267Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a safety device for a loom stop device that prevents the loom from stopping due to failure of the control circuit even if a stop push button switch is operated.

<Prior art> A conventional loom stop device transmits a loom stop signal by operating a stop push button switch to the drive circuit and braking device of the loom drive motor (main motor) through a control circuit, and connects the main motor and power supply. At the same time, the braking device is activated to stop the loom.

<Problems to be solved by the invention> By the way, the control circuit of a loom cannot help but become more complex due to an increase in the number of various control items and a demand for improved control accuracy. On the other hand, as looms operate at higher speeds, vibrations, which are the enemy of electrical circuits, tend to increase.

Due to this situation, failures in the control circuit occasionally occur, and even if the push button switch for stopping the loom is operated, the braking device or the like may not operate.

In such cases, the power to the loom was turned off and it came to a natural stop. However, since such a stop is often performed in an abnormal situation, it is necessary to ensure that the stop occurs once the stop push button switch is operated.

SUMMARY OF THE INVENTION An object of the present invention is to provide a safety device for a loom stop device that can quickly and reliably stop a loom by operating a stop push button switch even if the control circuit fails.

<Means for Solving the Problems> In order to achieve the above-mentioned object, the present invention starts timing in conjunction with the stop operation of the stop push button switch, and is reset at least by the next stop operation. A timer, a circuit that outputs an output when the time measured by the timer exceeds a predetermined time, and a circuit that receives a signal from the circuit and opens the connection contact between the loom drive motor and the power source.

<Function> In other words, if the loom does not stop within a predetermined time even if the stop push button switch is operated, the time measured by the timer exceeds the predetermined time, so a signal is issued, and the loom is stopped based on this signal. Cut off the power supply to the drive motor and stop the loom.

<Examples> Examples of the present invention will be described below based on the drawings.

FIG. 1 shows the overall structure of the loom.

In the figure, 1A and 1B are the frames of the loom, 2 is the warp,
3 is a bat crawler, 4 is a heddle, 5 is a reed, 6 is a woven fabric, 7 is a woven fabric, and 8 is a breast beam.

10 is the main shaft of the loom, and a main pulley 11 is fixed to one end of the main shaft. 12 is a main motor which is a loom driving motor, and its output pulley 13
A belt 14 is stretched between the main pulley 11 and the main pulley 11. Reference numeral 15 denotes an electromagnetic brake as a braking device, which is fixed to the frame 1B via a bracket 16 to brake the main pulley 11.

A sprocket 17 is fixed to the other end of the main shaft 10, and a shaft 18 supported by the frame 1A
Chain 2 is connected between sprocket 19 at one end.
0 is crossed. A worm 21 is fixed to the other end of the shaft 18 and meshes with a worm wheel 23 fixed to the output shaft of an inching motor 22. The inching motor 22 has a smaller output than the main motor 12, and its output is greatly reduced by a worm mechanism, so it is used when driving the loom at a relatively low speed.

24 is a weft length measuring and storage device, and 25 is a weft insertion nozzle.

Figures 2 to 5 show electrical circuits.

In FIG. 2, 30 is a power supply, 31 is a control circuit, 32 is a timing signal generator, 33 is a push button switch for operation, 34 is a normally closed push button switch for stopping, 35 and 36 are relays, and 35A is a contact point of relay 35. , 36A is a contact of the relay 36, 37 is a transistor, 38 is a resistor, 39 and 40 are diodes,
41 is a relay, and 44B and 44C are a normally closed contact and a normally open contact of a relay 44, which will be described later.

FIG. 3 shows the emergency stop circuit 42, 43 is a power supply, 44 is a relay, 44A is a contact of the relay 44,
45 is a transistor, 46 is a Zener diode, 47 is a capacitor, 48 and 49 are resistors, 50
is a reset switch. Further, 35B is a switching contact that is switched by the relay 35. Here, a resistor 48, a switching contact 35B, a capacitor 47
A CR timer 51 is formed.

FIG. 4 shows the drive circuit 52 of the main motor 12,
36B is a contact of the relay 36, 53 is an electromagnetic contactor (contactor), and 53A is a contact that is opened and closed by the contactor 53.

FIG. 5 shows a drive circuit 54 for the electromagnetic brake 15, where 55 is a power source, 56 is a diode stack, and 5
7 is a smoothing capacitor, 58 is a resistor, and 59 is a transistor. Further, 41A is a contact point of the relay 41.

Next, the action will be explained.

When the operation push button switch 33 is closed, the output from one output terminal 31A of the control circuit 31 becomes L level, and the output from the other output terminal 31B becomes H level.

At this time, the relay 36
is activated, thereby closing the contacts 36A and 36B. When contact 36B closes, contactor 53
is activated and the contact 35A is closed, so that current flows to the main motor 12. Further, since the relay 41 is deactivated, the contact 41A is opened, and the transistor 59 is non-conductive, no current flows through the electromagnetic brake 15. Therefore, the main motor 12 rotates and the electromagnetic brake 15 is inactive, so that the loom is operated. Note that although a voltage is applied to the emitter of the transistor 37 via the contact 36A, a voltage is also applied to the base via the diode 39, so the transistor 37 is non-conductive.

Next, when an abnormal situation occurs and you want to stop immediately, you can open the stop push button switch 34 and the control circuit 3
The output of the output terminal 31A of the first output terminal 31A becomes H level, and the output of the output terminal 31B becomes L level.

At this time, current flows through relay 41, and relay 3
No current flows through contacts 36A, 3.
6B is released. Therefore, the contactor 53 is deactivated, the contact point 37A is opened, and the main motor 1
At the same time, the current stops flowing through the electromagnetic brake 15, the contact 41A is closed, and the transistor 59 becomes conductive, so that current flows to the electromagnetic brake 15, which is activated and the loom is stopped.

On the other hand, while the stop push button switch 34 is open, the base voltage to the transistor 37 becomes L level, so the transistor 37 becomes conductive, the relay 35 operates, and the contact 35A closes. Self-maintained. The contact 35B is switched to the a terminal side by the operation of the relay 35, and the timer 5
1, that is, a circuit consisting of the resistor 48, the switching contact 35B, and the capacitor 47 is established, and charging of the capacitor 47 begins. However, since the relay 36 is deactivated and the contact 36A is opened, the relay 35 is deactivated during charging and the switching contact 35B is opened.
Since the power is switched to the terminal side, this charging is stopped.

However, the control circuit 31 failed and the output terminal 3
When the 1A output does not change to H level, the capacitor 47 continues to be charged and exceeds the Zener voltage. Then, current flows through the Zener diode 46 to the base of the transistor 45, so
This transistor 45 becomes conductive and the relay 44 is activated. As a result, the contact 44A is closed and the relay 44 is self-held, while the contact 44B is opened and the relay 36 is deactivated.
C is closed and the relay 41 is activated. Then,
As mentioned above, the contact point 53A of the contactor 53 is opened and the drive of the main motor 12 is stopped, and at the same time,
Contact 41A of relay 41 is closed and electromagnetic brake 15 is activated. This causes the loom to come to an emergency stop.

In addition, when restarting, the reset switch 50 is opened once and then the restart operation is performed.

6 and 7 show other embodiments of the electric circuit.

A is a driving circuit, which is a driving push button switch 70.
A normally closed contact 74A of a relay 74 (described later), a normally closed time limit contact 91A of a timer 91 (described later), and a relay 72 that closes a contactor 72X in a drive circuit 71 of the main motor 12 are connected in series. , a contact 72A of a relay 72 in parallel with the switch 70.
is connected. B is a stop circuit in which a stop push button switch 73 and a relay 74 are connected in series.

C is a reverse inching circuit, which includes a reverse inching push button switch 76 and an inching motor 22.
A relay 79 that closes a contactor 79X in a reverse rotation drive circuit 77 is connected in series. D is a forward rotation inching circuit, in which a forward rotation inching push button switch 80 and a relay 83 that closes a contactor 83X in a forward rotation drive circuit 81 of the inching motor 22 are connected in series.

E is a manual release circuit in which a manual release push button switch 84, a normally closed contact 74C of the relay 74, and a relay 85 are connected in series, and a contact 85A of the relay 85 is connected in parallel with the switch 84. ing.

F is a braking circuit, and the relays 72, 79,
83, 85 normally closed contacts 72B, 79A, 83A,
85B and a contactor 88 that closes the contactor 88X in the drive circuit 86 of the electromagnetic brake 15 are connected in series.

G is an emergency stop circuit, which includes a normally closed contact 90A of a relay 90 connected in parallel with the electromagnetic brake 15 in a drive circuit 86 of the electromagnetic brake 15, and a relay 74.
The normally open contact 74B and the timer 91 are connected in series. The timer 91 opens the normally closed time limit contact 91A after a predetermined period of time after activation, and opens the normally open time limit contact 91A.
Close 1B.

Reference numeral H designates an emergency braking circuit, which is formed by connecting a normally open time limit contact 91B of a timer 91 in parallel with the contacts 72B, 79A, 83A, and 85B of the braking circuit F.

Next, the action will be explained.

When the operation push button switch 70 is closed, the relay 72 is activated, and the contactor 72X of the drive circuit 71 of the main motor 12 is closed, and the contact 72B of the brake circuit F is opened, and the relay 88 is deactivated. , the contactor 88X of the drive circuit 86 of the electromagnetic brake 15 is opened, the electromagnetic brake 15 is released, and the main motor 12 rotates. Then, since the contact 72A is closed, the circuit is self-maintained and operation continues.

When the stop push button switch 73 is closed, the relay 74 is activated, the contact point 74A of the operating circuit B is opened, the relay 72 is deactivated, and the contactor 7 is activated.
Since the contact 72A and the contact 72A are opened and the contact 72B is closed, the power supply to the main motor 12 is stopped, and the electromagnetic brake 15 is activated by the relay 88 to stop the loom. Further, the contact 74B is closed and the timer 91 starts measuring time, but when the contactor 88X of the drive circuit 86 of the electromagnetic brake 15 is closed, the relay 90 is activated and the contact 90A of the emergency stop circuit G is opened. Therefore, the operation of timer 91 is stopped.

On the other hand, when the push button switch 76 for reverse inching is closed, the relay 79 is activated, the contactor 79X of the reverse drive circuit 77 of the inching motor 22 is closed, the inching motor 22 is driven in reverse, and the contact of the brake circuit F is closed. 79A is released, and the electromagnetic brake 15 is released. switch 7
If 6 is released, the relay 79 is deactivated, resulting in a stopped state.

Further, when the forward rotation inching push button switch 80 is closed, the relay 83 is activated, the contactor 83X of the forward rotation drive circuit 81 of the inching motor 22 is closed, and the inching motor 22 is driven in the forward rotation, and the braking circuit The F contact 83A is opened and the electromagnetic brake 15 is released. switch 8
If 0 is released, the relay 83 becomes inactive, resulting in a stopped state.

Furthermore, when manually releasing the brake, when the switch 84 is closed, the relay 85 is activated, closing the contact 85A and opening the contact 85B, so the relay 88 is deactivated and the electromagnetic brake 1
5 is canceled. Moreover, since this circuit is self-maintained by closing the contact 85A, the main shaft 10
can be set to a predetermined phase by hand-turning. To release this, press the stop push button switch 7.
3 is closed, and the contact 7 is closed by the operation of the relay 74.
All you have to do is release 4C and release self-holding.

For example, if the contact 74A of the relay 74 of the stop circuit B fails, the contact 74A will not open even if the stop push button switch 73 is closed, so the relay 72 will continue to operate and the relay 88 will not operate either. At this time, since the relay 90 is not activated and therefore the contact 90A is not opened, the timer 9
1 is the time limit contact 9 of the driving circuit B, which measures a predetermined time.
1A and time-limiting contact 91B of the emergency braking circuit H.
Close. Therefore, the drive of the main motor 12 is stopped, and the electromagnetic brake 15 is activated to brake the main shaft 10.

In this example, the time measured by the timer 91 is set to be slightly longer than the time during which the loom normally operates and stops.

<Effects of the invention> As explained above, according to the invention, even if the control circuit breaks down midway, the power to the loom drive motor is cut off after a predetermined period of time has passed after operating the stop push button switch, which improves safety. can be improved.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a loom showing an embodiment of the present invention, Figs. 2 to 5 are electrical circuit diagrams of the same embodiment;
FIGS. 6 and 7 are electrical circuit diagrams showing other embodiments. 10...Main shaft, 12...Main motor, 15...Electromagnetic brake, 22...Inching motor, 33,
70...Push button switch for operation, 34, 73...Push button switch for stop, 42...Emergency stop circuit, 5
1,91...Timer, A...Driving circuit, B...Stop circuit, F...Brake circuit, G...Emergency stop circuit,
H...Emergency braking circuit.

Claims (1)

[Claims for Utility Model Registration] (1) When the stop pushbutton switches 34 and 73 are operated to stop, they open the connection contacts between the loom drive motor 12 and the power supply, and also open the connection contacts between the braking device 15 and the power supply. In the loom stop device which is configured to stop the loom by closing the loom, a timer 51 starts measuring time in conjunction with the stop operation of the stop push button switches 34 and 73, and is reset at least until the next stop operation. , 91, circuits 46 and 45 that output when the time measured by the timer exceeds a predetermined time, and circuits 44 and 44B that receive a signal from this circuit and open the connection contact between the loom drive motor 12 and the power source. , 91A. (2) It is characterized by having circuits 44C and 91B that close the connection points between the braking device 15 and the power source based on signals from the circuits 46 and 45 that are output when the time measured by the timer exceeds a predetermined time. A safety device for a loom stop device according to claim 1 of the utility model registration claim.