JPH0790753A - Control of rotational number of loom and device therefor - Google Patents

Abstract

PURPOSE:To enable stable weft inserting of a special yarn without lowering the whole operating efficiency. CONSTITUTION:A controller 20 and a rotational number controller 12 for controlling the rotational number (Ni) of a loom according to a weft yarn (Yi) to be subjected to weft inserting are equipped. In the case the weft yarn (Yi) is a specified weft yarn, the controller 20 stops the loom once and restarts it at a rotational number (Ni) corresponding to the weft yarn (Yi).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the rotation of a loom for operating the loom without trouble even if the weft is an extremely peculiar yarn when controlling the number of revolutions of the loom according to the weft to be inserted. The present invention relates to a numerical control method and its device.

[0002]

2. Description of the Related Art A weaving machine that carries out multicolor weft insertion can improve its productivity by controlling the speed of rotation in accordance with the weft to be wefted. The loom at this time is
When wefting a thread that has low strength and is easy to break, a thread that has a large thread weight, or a thread that has low fluid resistance and is difficult to ride on a fluid jet, the rotation speed is decreased while the thread that is strong and difficult to cut, This is because when weft-inserting a yarn having a small yarn weight, or a yarn having a large fluid resistance and easily riding a fluid jet, it is possible to operate by increasing the rotational speed.

In order to realize such a shift operation, it is preferable to provide an appropriate transition section between regions having different rotational speeds (for example, Japanese Patent Laid-Open No. 5-78955). The rotation speed of the loom is controlled by the rotation speed control system of the drive motor,
This is because it is physically impossible to change extremely rapidly due to the restriction of the follow-up response characteristics such as the pressure control system of the weft insertion fluid and the timing control system of the weft insertion. Therefore,
It has been proposed that the rotational speed of the loom be continuously changed in the transition section so as to be linear in time according to the maximum gradient allowed by each of the constraint conditions (the same).

[0004]

According to the prior art, the weaving machine cannot operate smoothly when the wefts to be wefted include yarns requiring extremely low rotational speed. There was a problem that there is. For example,
Special yarns such as gold yarn, silver yarn, lame yarn, and ultra-thick yarn are large in weight per unit length, and the fluid resistance is relatively small compared to the yarn weight. The characteristics are extremely poor. Therefore, when weft-inserting these special yarns, a particularly long weft-insertion time is required, and the rotation speed of the loom must be extremely reduced. If so, the required transition section becomes too long, and the overall operating rate of the loom will deteriorate. In addition, when a long transition section is provided in this way, weft insertion conditions during that time are not stable, and weft insertion with respect to other wefts tends to be unstable.

Therefore, the object of the present invention is particularly long by stopping the loom once and then restarting the loom at a rotational speed corresponding to the weft when the weft to be put in is a specific weft. It is an object of the present invention to provide a method for controlling the number of revolutions of a loom and a device therefor, which enables smooth running of the loom without deteriorating the overall operation rate even when using a special yarn that requires weft insertion time. .

[0006]

The constitution of the first invention according to this application for achieving the above object is such that when controlling the rotation speed of the loom according to the wefts to be weft-inserted, the wefts to be weft-inserted are When it is a specific weft, stop the loom once, and then restart the loom at the rotation speed corresponding to the weft,
The gist is to insert the weft.

According to the second aspect of the invention, the weaving machine has a storage means for storing the number of rotations of the loom corresponding to each weft, and a weaving machine to be inserted according to a weft selection commanded by the weft selection device based on the storage information of the storage means. When the weft to be inserted is a specific weft, the control means stops the loom once and then restarts the loom at the number of revolutions corresponding to the weft. The idea is to start.

[0008]

According to the structure of the first invention, the loom comprises:
When the weft to be wefted is a specific weft, it is temporarily stopped and then restarted at the number of revolutions corresponding to the weft,
It operates so as to insert the weft. Therefore, the loom at this time can shift from the rotation speed corresponding to the weft before the weft to the rotation speed corresponding to the weft after a short stop period without passing through the transition section. The time can be shorter than going through the transition section. However, the specific weft thread here means a special thread such as gold thread, silver thread or lame thread, and the rotation speed corresponding to these special threads is, for example, several tens rpm.
It shall be set to a very low speed.

According to the second aspect of the invention, the control means can operate as in the first aspect of the invention on the basis of the information stored in the storage means, so that the first aspect of the invention can be carried out as a whole.

[0010]

Embodiments Embodiments will be described below with reference to the drawings.

The loom rotational speed control device comprises a storage means 11
And a control means 20 (FIG. 1).

The weft selection signal Sy from the weft selection device WF is input to the control means 20. The storage means 11 and the control means 20 are bidirectionally connected, and the output of the control means 20 is connected to the drive motor M via a rotation speed control device 12 such as an inverter device. However, the output of the control means 20 is the rotation speed command signal Sn, and the drive motor M is the drive motor of a loom (not shown). The loom at this time is assumed to be an air jet loom.

Another output of the control means 20 is input to the stop control device 13 as a stop command signal St. The stop control signal St1 and the stop completion signal St2 from the stop control device 13 are guided to the rotation speed control device 12 and the brake B attached to the drive motor M, respectively, and the control means 2 is operated.
It is fed back to 0.

The control means 20 mainly comprises a reading means 21, a discriminating means 22, and flip-flops 23 and 25 (FIG. 2).

Weft selection signal Sy from the weft selection device WF
Is input to the reading means 21, and the storage means 11 is bidirectionally connected to the reading means 21. The output of the reading means 21 is connected to the set terminal S of the flip-flop 23 via the discriminating means 22, and the output terminal Q of the flip-flop 23 is externally output as a stop command signal St via the one-shot pulse generator 24. Have been pulled out. In addition,
The stop completion signal St2 is branched and input to the reset terminal R of the flip-flop 23 and the set terminal S of the flip-flop 25, and the stop command signal St is branched and input to the reset terminal R of the flip-flop 25. Further, the output of the reading means 21 is passed through the switch means 26,
The rotational speed command signal Sn is taken out to the outside, and the switch means 26 is connected to the output terminal Q of the flip-flop 25.

The weft selection device WF determines the weft Yi (i = 1, 2, ...) To be weft-inserted for each pick according to the specifications of the woven fabric to be woven by the loom, and predetermined through a weft-insertion mechanism (not shown). The weft Yi of No. 3 is inserted and the weft selection signal Sy is output. That is, the weft selection signal Sy
Indicates a weft yarn Yi to be weft-inserted. On the other hand, the storage means 11 stores, for each weft yarn Yi, the corresponding rotation speed Ni of the loom.
(I = 1, 2, ...) Is stored.

Therefore, when the loom is operating normally, the reading means 21 of the control means 20 inputs the weft selection signal Sy from the weft selection device WF, and the weft Yi to be wefted indicated by the weft selection signal Sy. Is sent to the storage means 11, the storage means 11 stores the number of revolutions N corresponding to the weft Yi.
i can be sent back to the reading means 21. That is,
The reading means 21 uses the weft Yi to be weft inserted as a key.
The rotation speed Ni corresponding to the weft Yi can be read from the storage means 11.

The reading means 21 sends the rotation speed Ni thus read through the switch means 26 to the rotation speed control device 12 as a rotation speed command signal Sn. Therefore, the rotation speed control device 12 can control the rotation of the drive motor M so that the rotation speed Ni is instructed by the rotation speed command signal Sn, and realize the rotation speed N = Ni of the loom. However, at this time, the switch means 26 is in the connected state because the flip-flop 25 is in the set state. That is, the control means 20 can control the number of revolutions N of the loom to the number of revolutions Ni according to the weft yarn Yi to be wefted based on the information stored in the storage means 11 (time t <t1 in FIG. 3).

Next, the weft yarn Yi = Y3 is a special yarn,
It is assumed that the rotational speed N3 corresponding to the weft Y3 is extremely low and the weft Y3 is selected as the weft Yi to be weft-inserted.

At this time, the reading means 21 uses the weft Yi = Y.
Since the rotation speed Ni = N3 corresponding to 3 is read from the storage means 11 and output, the discrimination means 22 detects it and sets the flip-flop 23, and the pulse stop is made via the one-shot pulse generator 24. Generate a command signal St (time t = t1 in FIG. 3, hereinafter, simply (t = t1)
Is written as). Therefore, the stop control device 13 can input the stop command signal St and send the stop control signal St1 to the rotation speed control device 12 and the brake B to stop the loom (same). At this time, the flip-flop 25 is reset by the stop command signal St and the switch means 26 is opened so that the rotation speed command signal Sn from the control means 20 also disappears.

When the loom is stopped, the stop control device 13
When it is detected, a stop completion signal St2 is generated (t = t2
), The stop completion signal St2 can reset the flip-flop 23 of the control means 20 and set the flip-flop 25. Therefore, the switch means 26 returns to the connected state, and the rotation speed command signal Sn indicating the rotation speed Ni = N3 is output to the rotation speed control device 12, so that the drive motor M becomes the rotation speed N = N3 of the loom. You can restart the loom so that (same). That is, the loom may be put in the weft Y3 after being restarted in this way. Further, the control means 20 then, in exactly the same manner as described above, the rotation speed N of the loom corresponding to the weft Yi to be wefted.
= Ni, the rotation speed control of the drive motor M is continued via the rotation speed control device 12.

In the above description, the discriminating means 22 determines that the number of revolutions Ni from the reading means 21 is Ni ≠ N3 to Ni =.
It shall be activated only when it changes to N3, and shall not be activated when Ni = N3 continues. That is, when the rotational speed N of the loom has already become N = N3, the discriminating means 22 continues the operating state of N = N3 and continues the weft insertion of the weft Y3 without restarting the loom. You can do it.
Further, the discriminating means 22 uses the rotation speed Ni from the reading means 21.
Instead of detecting that Ni = N3, the number of revolutions N
It is detected that i is lower than a predetermined rotation speed, or that the difference between the current rotation speed Ni and the previous rotation speed Ni is set smaller than a predetermined value. Good.

[0023]

[Other Embodiments] Instead of being connected to the output side of the reading means 21, the judging means 22 may branch-input the weft selection signal Sy (FIG. 4). Discriminating means 22 at this time
Is a weft Yi to be inserted by the weft selection signal Sy = Yi = Y
It should detect 3 and operate. That is, the control means 20
Detects that the weft Yi to be weft-inserted is a specific weft through the discriminating means 22, and operates so as to temporarily stop the loom.

In the above description, the stop completion signal St2
Indicates that the stop operation of the loom is completed in response to the stop command signal St. Therefore, the stop completion signal St2 can be generated by detecting that the drive motor M or an arbitrary rotating shaft of the loom driven by the drive motor M has stopped. The stop command signal St is generated as the stop completion signal St2, and the stop control device 13 outputs the stop control signal St1.
It is also possible to create by detecting that a time longer than the time required for the loom to stop has been passed after the output of.

The rotation speed N of the loom is changed from N = Ni (i ≠ 3) to N = Nj (j ≠) without stopping the loom once.
3, j = 1, 2 ...), an appropriate transition section Tij (i = 1, 2 ..., j = 1, 2 ...) may be provided between them (two points in FIG. 3). Chain line). Further, when the number of revolutions N of the loom is changed from N = N3 to N = Ni (i ≠ 3), the loom may be temporarily stopped if necessary. The present invention can be directly applied to not only the air jet loom but also the water jet loom and the loom of any other type. However, in the jet loom, when the weft yarn Yi to be wefted is a specific weft yarn, the jetting period of the weft insertion nozzle is set to be particularly long as compared with the case of inserting another weft yarn. Alternatively, a large traction force may be applied. For example, the end of the injection timing for a specific weft may be set later than that for another weft.

[0026]

As described above, according to the first invention of this application, when the weft to be wefted is a specific weft, the loom can be stopped by temporarily stopping the loom. Even if the number of rotations is extremely low,
Since it is possible to shift to a predetermined rotation speed in a short time without going through a long transition section, there is a risk that the overall operating rate will be unreasonably reduced or weft insertion will become unstable during the transition section. There is no effect, and there is an excellent effect that it can operate smoothly.

According to the second invention, the control means operates in accordance with the first invention, so that the first invention can be directly implemented as a whole.

[Brief description of drawings]

[Figure 1] Overall configuration system diagram

[Fig. 2] Block diagram of main parts

[Fig. 3] Operation explanatory diagram

FIG. 4 is a block diagram showing the main part of another embodiment.

[Explanation of symbols]

 Yi (i = 1, 2 ...) ... Weft N, Ni (i = 1, 2 ...) ... Rotational speed WF ... Weft selection device 11 ... Storage means 20 ... Control means

Claims (2)

[Claims] 1. When controlling the number of revolutions of a loom according to the wefts to be wefted, when the weft to be wefted is a specific weft, the loom is once stopped and the number of revolutions corresponding to the weft A method for controlling the number of revolutions of a loom, wherein the weaving machine is restarted by the method, and the weft is inserted. 2. A storage means for storing the number of rotations of the loom corresponding to each weft, and the number of rotations of the loom according to the wefts to be inserted by the weft selection device based on the storage information of the storage means. And a control means for controlling, the control means, when the weft to be inserted is a specific weft,
A rotation speed control device for a loom, wherein the loom is once stopped and then restarted at a rotation speed corresponding to the weft.