JPH0258382B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method of controlling a loom preventing device of a loom.

(Prior Art) When an accident such as a weft insertion error or a warp breakage occurs in a loom, the loom is temporarily stopped and the operation is restarted after the cause of the accident is removed. However, while the loom is stopped, the warp threads remain under tension, causing them to elongate. Therefore, weaving is carried out with insufficient warp tension for several picks after restarting operation, resulting in the disadvantage that thin corrugations occur in the woven fabric.

As a countermeasure to this problem, for example, the thread prevention device disclosed in JP-A-56-14427 solves this thin thread problem by increasing the warp tension higher than during steady operation for a predetermined period of time after startup. It has been resolved.

By the way, when the loom stops due to an accident such as a weft insertion error (lateral stop), the loom stops at a predetermined timing during beating of one weft (additional weft) that was further inserted after the accidental weft was inserted. Stop.

Afterwards, the loom is reversed and the loom is assembled,
In this case, the additional weft yarns are first removed from the warp opening opened by the first reversal, and then the loom is reversed once more, and then the accidental weft yarns are removed.

Thereafter, the loom is reversed one more time to bring the weft inserted before the accidental weft (normal weft) into a state before reeding.

At this time, the woven fabric that has already been wound up by the two reversals is rewound by the amount of the reversal, so that the woven fabric and the warp threads connected thereto are loosened. As a result, the cloth opening is in a state where it has moved slightly from its normal position toward the delivery side. Therefore, if the loom is started in this state, the normal weft yarns will be beaten appropriately and no loom will be formed.

However, if the weaving step prevention device is activated when restarting the operation after stopping the weft while the weaving shed is moved,
Furthermore, since the weaving opening moves toward the delivery side, the weft yarns are strongly beaten, resulting in the inconvenience of creating thick tiers.

(Summary of the Invention) An object of the present invention is to prevent the occurrence of thick rows due to the operation of the row prevention device during re-operation after the weft stop as described above.

Therefore, the gist of the present invention is to prevent the weaving step prevention device from operating when the loom is restarted after the weft alignment at the weft stop.

(Embodiment) What is shown in FIGS. 1 and 2 is an embodiment of an electric circuit for carrying out the control method of the present invention. In this example, loom stoppages are classified into weft stoppages caused by weft accidents and warp stoppages due to warp accidents, and the loom stop prevention device is activated only when the loom is started after warp stoppages.

In the illustrated circuit, S1 and S2 are the starting switches of the loom, and S3 is the lamp LP as described later.
Or it is a manual switch for operating the weaving bar prevention device.

When relay R1 is energized, R1a1 and R1a2 are
Also, R2a, R2b1 and R2b2 are relays R
When relay R3 is energized, R3a and R3a2 are relay contacts that are respectively activated when relay R3 is energized.

TR1a and TR2b are relay TR1 and
This is a time-limited relay contact that operates when TR2 becomes conductive.

R5a is a relay contact that operates when a preparation switch (not shown) is turned on before the loom starts operating, and R6b is a relay contact that operates when an accident occurs or when a stop switch (not shown) is turned on.

SV is a solenoid valve for commanding the operation of a step prevention device (not shown). By energizing this, the weaving step prevention device is activated, and for example, the tension roll supporting the warp moves upwards or backwards in the warp delivery direction, increasing the tension of the warp. ” will be held.

LP is a lamp that lights up when the loom has stopped, as will be described later. Further, when relay R2 is energized, the magnet switch of the loom driving motor is turned on, power is supplied to the motor, and the loom starts operating.

In FIG. 2, A is a terminal that is always held at a high potential H, and C is a terminal that is always held at a low potential L. B is a terminal that is normally H, but becomes L after the warp stops, and becomes H after the preparation switch is turned on.

In the above configuration, when the loom is operating, the relay contact R5 is turned on, and the relay contact R5 is turned on.
Contact 2a is in the on state. Therefore, since relay R2 is energized, the magnetic switch is in an on state, and power is supplied to the loom drive motor.

Furthermore, when the contact of relay contact R6b is turned off and the energization to relay R2 is stopped, the magnetic switch is turned off and the power supply to the loom drive motor is stopped, and the loom is stopped.

In FIG. 2, terminal B is in the H state. Therefore, at this time, relay R3 is not energized and lamp LP is not lit.

If a warp accident occurs while the loom is operating,
Terminal B changes from H to L. Further, since current starts to flow between terminals A and B, lamp LP lights up and relay R3 is energized. Then, the relay contacts R3a1 and R3a2 are turned on.
Furthermore, the contact of relay contact R6b is turned off, allowing energization to relay R2, so the magnetic switch is turned off, power supply to the loom drive motor is stopped, and the loom is stopped. That is, the third
The state shown in (1) of Figure A is reached.

In FIGS. 3A and 3B, "on" means a state in which electricity is applied or the contact is on, and "off" means a state in which it is not energized or a state in which the contact is off. There is.

When the preparation switch is turned on after the warp accident has been removed, terminal B changes from L to H. Then the lamp
Since the power to LP is stopped, the lamp LP goes out. On the other hand, since the terminals A and C are in a conductive state, the relay R3 continues to be energized. In other words, in Figure 3A
This is the state (2).

When starting switch S1 or S2 is turned on in this state, relay R1 is energized first, so relay contact R1a1 is turned on, and relay R1 is self-held. At the same time, the contact of the relay contact R1a2 is turned on, and the electromagnetic valve SV is energized, so that the weaving step prevention device is activated and the kinkback is performed. In other words, the state (3) is reached.

At this time, relay TR1 is also energized, so when time td has elapsed after starting switches S1 and S2 are turned on, the contact of relay TR1a is turned on and relays R2 and TR2 are energized. This is the state (4).

When relay R2 is energized, relay contacts R2a and R
The contacts 2b1 are turned on and off, respectively, and the relays R2 and TR2 are kept energized, while the relay R1 is de-energized. As a result, relay R
The self-holding of the valve 1 is released and the energization of the solenoid valve SV is stopped, so that the kickback is stopped. At this time, the magnet switch of the loom drive motor is turned on and the loom starts operating.

At the time of starting after the above-mentioned temporary stop, the weaving step prevention device is activated to perform the kickback.

If a weft accident occurs while the loom is operating,
In FIG. 1, the contact of relay contact R6b is turned off, and the current supply to relay R2 is stopped. Therefore, the magnet switch of the loom drive motor is turned off and the loom stops. That is, the state shown in parentheses in FIG. 3B is reached.

In this case, terminal B maintains the H state, so relay AR3 is not energized and lamp LP
does not light up. Further, the contact of relay R3a1 maintains the off state. This is shown in Figure 3B ()
It is in a state of

When the preparation switch is turned on after removing the weft yarn accident, the contact point of relay R5a is turned on. This is the state of ().

When drive switch S1 or S2 is turned on in this state (that is, state ()), relay R1 is energized, so the contact of relay R1a1 is turned on, and relay R1 is self-held. At the same time, the contacts of relay R1a2 turn on,
Since the contact of the relay contact R3a1 is off, the solenoid valve SV is not energized, and therefore the step prevention device is not activated.

When the predetermined time td has passed after the start switch S1 (or S2) is turned on, the relay contact TR
Contact 1a is turned on, and relays R2 and TR2 are energized. This is the state of ().

Relays R2a and R2b are activated by energizing relay R2.
Since the contacts No. 1 are turned on and off, respectively, the loom drive magnet switch is turned on and the loom starts operating.

As described above, the weaving step prevention device does not operate when the weft is started after the weft has stopped.

In the above example, when starting up after an elapsed stop, after turning on the start switches S1 and S2, the loom preventing device is first activated, and after the predetermined time td has elapsed, the loom preventing device is stopped and the loom is started. is running.

This method is inconvenient in the case of an air-jet loom, for example, in which a common source of fluid (air) is used to operate the weave prevention device and the weft inserting mechanism. That is, when the loom is started and the loom preventing device is activated at the same time, the pressure of the fluid source drops rapidly, and the leading edge of the weft inserted immediately after the start of the loom wobbles due to the drop in conveying force. As a result, accidents such as weft insertion errors occur.

In order to avoid such inconvenience, when the start switch is turned on, fluid is first supplied to the weaving step device of the loom, and once the fluid supply has progressed and the pressure of the fluid source has stabilized, the operation of the loom is started. is proposed. However, apart from considering this point,
The start of operation of the loom and the operation of the weaving step prevention device may be performed at the same time.

Furthermore, in the configuration described above, the weaving step prevention device is rendered inactive and activated, respectively, at the time of startup after the weft has stopped and at the time of startup after the warp has been stopped. However, by turning on the stop switch,
For example, the loom may be stopped artificially at night.
Alternatively, the weaving step prevention device may be configured to operate when the weaving machine is not aligned after stopping, such as when starting after stopping due to a power outage or the like.

Furthermore, the weaving bar prevention device is not limited to the above-mentioned knock-back type; for example, it may also include a system that changes the reed striking force by changing the torque of the loom drive motor at startup, thereby preventing the weaving bar. This invention can be applied.

As described above, according to the present invention, the weaving step prevention device is not activated when the weft is started after the weft is stopped. Therefore, it is possible to prevent the inconvenience of thick steps occurring when the weft is started after the weft is stopped, and the quality of the woven fabric can be reliably improved.

[Brief explanation of drawings]

Figures 1 and 2 are circuit diagrams showing part of the electric circuit used in one embodiment of the present invention, and Figures 3A and B.
is a diagram showing the operation timing of each part in the above embodiment. R1~R3, TR1~TR2...Relay, S1
~S3...Switch, SV...Solenoid valve, LP...Lamp.

Claims (1)

[Scope of Claims] 1. In a loom having a device for preventing weaving steps at start-up, when the loom is restarted after the weaving at weft stop, the operation of the device for preventing weaving steps is prohibited. A method for controlling a weaving step prevention device of a loom, characterized in that: