JPS58186640A - Control of weaving step preventing apparatus of loom - 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 a method for controlling a step prevention device of a loom.

When a problem occurs in a loom, such as a weft insertion error or a warp breakage, the loom is temporarily stopped and restarted after the problem has been removed, but while the loom is stopped, the warp remains under tension. Because of this, the warp yarns stretch while the machine is stopped, and the warp tension is insufficient for a few pitches after restarting operation, resulting in the woven fabric becoming a thin film. For this reason, for example, a weaving bar prevention device disclosed in JP-A-56-14427 is used to increase the warp tension for a predetermined period of time after startup compared to that during steady operation to eliminate this drawback.

By the way, when a loom stops due to a weft trouble such as a weft insertion error (weft stop), the loom is reversed in order to eliminate the problem after the loom stops, a so-called matching operation is performed. That is, when a weft trouble occurs, the loom is stopped at a predetermined timing after the trouble yarn has been inserted and one more weft (weft ■) has been inserted and before reed beating. After the loom has stopped, the loom is first reversed once to remove the weft yarn ■ from the warp opening, and then reversed once again to remove the trouble yarn. The weft was reversed once again and the weft was inserted before the trouble yarn (
The weft thread ■] is brought into the state before it is beaten. Since the loom is started in this state, the weft ■ will be beaten again. For this reason, there is an inconvenience in that if the weaving step prevention device is activated when the weft is restarted after the weft has been stopped, a thick film will instead be formed.

The purpose of this invention is to solve the above-mentioned inconvenience, and the gist of the present invention is to prevent the loom prevention device from operating when the loom is started after the weft-aligning operation is performed, such as when the loom is started after the weft has stopped. do.

The present invention will now be described using the embodiments shown in the accompanying drawings. This will be explained in detail.

Figures 1 and 2 show part of the electrical circuit of a loom equipped with a loom prevention device according to an embodiment. In this embodiment, the loom is stopped by a weft stop and a stop due to warp trouble (warp stop). The system is classified so that the weaving step prevention device is activated only when starting up after stopping.

In FIG. 1.2, 31.82 is a starting switch for the loom, and S6 is a manually operated switch for operating the lamp LP or the weaving bar prevention device, as will be described later. Also, Rlal and R1a2 are R2a when relay R1 is energized.
, R2b1. R2b2 is activated when relay R20 is energized, and R3a1. R3a2 is a relay contact that operates when relay RB is energized. Further, TR1a and TR2b are each relay TR1.

This is a time-limited relay contact that operates when TR2 is energized. Furthermore, R5a is a relay contact that operates when a preparation switch (not shown) is turned on before the loom starts operating, and R6
b is a relay contact that operates when a trouble occurs or when a stop switch (not shown) is turned ON.

sv'+! This is a solenoid valve for commanding the operation of a weaving bar preventing device (not shown). By energizing the solenoid valve SV, the weaving bar preventing device is activated and, for example, the tension roll supporting the warp moves in the warp sending direction. The so-called kickback occurs in which the tension of the warp yarns increases as the warp yarns move upward or backward. LP is a lamp that is turned on when the loom has stopped, as will be explained below. Further, when the relay R2 is energized, the magnetic switch of the loom driving motor is turned on, power is supplied to the motor, and the loom starts operating.

Furthermore, in FIG. 2, A is always at a high potential (#H") K.

Further, C is a terminal that is always held at a low potential (It, II). B is normally I Hl, but in the case of cessation, it becomes Lm, and after turning on the preparation switch, it becomes ll.
This is the terminal that becomes H''.

In this embodiment having the above configuration, while the loom is operating, the relay contact R5a is in the ON state, and the relay contact R2a is in the ON state, so that the relay R5a is in the ON state and the relay contact R2a is in the ON state.
2 is energized, the magnetic switch is ON, and power is supplied to the loom drive motor. Further, in FIG. 2, the terminal B is in the 11H" state. Therefore, at this time, the relay R3 is not energized and the lamp LP is not lit.

If a warp trouble occurs while the loom is operating, contact terminal B, ! ,; IHI becomes L''.Then, current starts to flow between terminal A and terminal 8, so 4B LP
lights up and relay R3 is energized.

Then, relay contact R3a1. The contact point of R3a2 is turned on, and the seat R3 is self-retained and the solenoid valve SV is in a state where it can be energized. uIJchi Figure 3 (At(])
The state shown in is reached. In addition, in Fig. 6 (Al, (Bl), ON means the state where the current is energized or the contact is ON.
In this state, OFF means a state in which no electricity is applied or a state in which the contact is OFF. In addition, in Fig. 1, the contact of relay contact R6b is turned OFF, and the energization to relay R2 is stopped, so the magnetic switch is turned OFF.
F, the power supply to the loom drive motor is stopped, and the loom is stopped.

When the preparation switch is turned on after the warp trouble has been removed, the terminal B changes from IILII to IIH''.Then, the power supply to the lamp LP is stopped, so the lamp LP goes out.

On the other hand, since the terminals A and C are in a conductive state, relay R6 continues to be energized. That is, it is the state (2) of FIG. 6 (Al).

In this state, turn on the start switch s1 or $2.
, the relay R1 is energized first, so the relay contact R1a1 is turned ON, and the relay R1 is self-holding, and the relay contact R1a2 is turned ON [because the solenoid valve SV is energized. The weaving rack prevention device operates and kickback occurs ((state 31). Also, at this time, the relay TRI is also energized, so the start switch 51 (
When a predetermined time td elapses after S2) is turned ON, the contact of relay contact TR1a is turned ON, and relays R2 and TR2 are energized (state (4)).

When relay R20 is energized, relay contact R2a.

Since the contacts of R2b1 turn ON and OFF, respectively, energization of relays R2 and TFt2 is maintained, and relay R
10, the energization is stopped, the self-holding of the relay R1 is released, and the energization of the solenoid valve SV is also stopped, so that the kickback is stopped. (7) The magnetic switch of the R1 loom driving motor is turned on, and the loom starts operating.

As described above, when the weaving machine is started after the weft is stopped, the weaving step prevention device is activated and kickback is performed.

If a weft trouble occurs while the loom is operating,
In the figure, the contact of relay contact R6b is turned OFF and the energization to relay R2 is stopped, so the magnetic switch of the loom drive motor is turned OFF and the loom is stopped. That is, the state is as shown in FIG. 3(B) K and fl). In this case, the terminal B maintains the IIH'' state, so the relay R6 is not energized and the lamp LP is not lit.Then, the relay contact R3a1 maintains the OFF state. ( Figure 6 (Il of Bl
condition).

When the preparation switch is turned on after the weft trouble is removed, the contact of the relay contact R5a is turned on. (in)
condition). In this state, when starting switch S1 or S2 is turned on, (state of ■) relay R
1 is energized, the contact of relay R1a1 is turned ON, relay R1 is self-held, and relay contact R1
The contact a2 is turned on, but since the relay contact R3a1 is turned off, the electromagnetic valve SV is not energized (therefore, the stack prevention device does not operate).

Then, when a predetermined time td elapses after the start switch S1 (S2) is turned on, the contact of the relay contact T'R1a turns OFF.
becomes N, and relays R2 and TR2 are energized.

((Concave state). When relay R2 is energized, relay contacts R22L and R2b1 are turned ON and OFF, respectively, so the magnetic switch of the loom drive motor is turned OFF.
N and the loom starts operating.

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

In the above embodiment, when starting after stopping, after turning on the start switch (sl, s2), the weaving rack prevention device is first activated, and after a predetermined time (td) has elapsed, the weaving rack prevention device is activated. operating the device. For example, in air-jet looms that use a common fluid (air) source to operate the loom prevention device and the weft inserting mechanism, this is necessary when starting the loom and starting the loom prevention device. If this operation is carried out at the same time, the pressure of the fluid source will drop rapidly, resulting in a decrease in the conveying force for the weft inserted immediately after startup, causing the weft tip to wobble, resulting in problems such as weft insertion mistakes. Inconvenience is likely to occur. In order to prevent this inconvenience, when the start switch is turned on, fluid is first supplied to the weaving bar prevention device, and once the fluid supply to the weaving tray prevention device has progressed and the pressure of the fluid source has stabilized, It has been proposed to start the operation of the loom, and this embodiment takes this point into consideration, but it is also possible to adopt a configuration in which the start of the loom and the operation of the weaving stage prevention device are performed simultaneously.

In addition, in the above explanation, it is assumed that the weaving bar prevention device is deactivated and activated when starting up after stopping the weft and when starting up after stopping the weft, respectively. The loom preventing device may be configured to operate when the loom is stopped automatically or when the loom is not aligned after stopping, such as when starting after stopping due to a power outage or the like.

Further, the weaving rack prevention device is not limited to the so-called kickback type device as in the embodiment, but may be used, for example, by changing the torque of the loom driving motor at startup to change the shedding force, thereby preventing the weaving rack. It goes without saying that the present invention can also be used in other systems.

As described above, according to the present invention, the weaving step prevention device does not operate when starting up after stopping the weft, and unlike conventional methods, if a thick film occurs when starting up after stopping the weft, it will cause inconvenience. can be prevented and the quality of woven fabrics can be reliably improved.

[Brief explanation of the drawing]

1 and 2 are circuit diagrams showing a part of the electrical system in the embodiment of the present invention, and FIG. 6 (Al and Bl are graphs showing the operation timing of each part in the embodiment. R1 to R3 ,-TRI ~ TR2...
-81~S3...Switch SV...Solenoid valve LP...Lamp patent applicant Tsudakoma Kogyo Co., Ltd.

Claims (1)

[Scope of Claims] [1] A loom having a device for preventing weaving steps during start-up, characterized in that the weaving step preventing device is activated only when the loom is started after stopping due to a predetermined cause of stoppage. A method of controlling a weaving step prevention device. [2] The method according to claim 11, wherein the cause of the stoppage is a cause other than a weft trouble. [3] The method according to claim 1, wherein the cause of the stop is a cause that does not require a matching operation.