JP2003049345A - Electric delivery for towel loom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a neat pile fabric through stabilizing the tension in pile formation in view of the fact that the delivery tension roll of a loom, especially a pile-forming towel loom, moves quickly, thereby the tension gets instable, resulting in no formation of neat piles. SOLUTION: A control system for making such a neat pile fabric works as follows: the winding diameter of a delivery beam is electrically detected to calculate the respective feeds of ground yarn and pile separately; based on the result, the rotational speed of the delivery beam is controlled at a necessary timing, thus mitigating the quick motion of the tension roll to stabilize delivery tension.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to control of an electric feeding device for warp yarns for piles of a towel loom.

[0002]

A device in which a tension motor is driven by a servomotor has been put into practical use as a device for accurately controlling the warp tension of a pile of a towel loom, and as an example, JP-A-63-275751, There is a pile warp yarn tension control method and its device, etc., but there is still a problem that pile warp yarn disorder occurs due to high price and tension roll bending due to tension roll inertia and rapid movement. Is to control the pile pile warp tension accurately with a simple device and to ensure that the warp threads are delivered to the pile forming device of the loom without disturbance.

[0003]

The present invention relates to a method for controlling the warp thread tension for piles, from a conventional method of moving a tension roll to a method of delivering the warp thread length required for a pile at a necessary timing. Is achieved by changing Conventionally, the delivery device delivers the average length of the yarn length required for the ground yarn and the yarn length required for the pile, and the delivery is controlled so as to balance the tension of the warp yarn with the spring connected to the tension roll. .

Therefore, in the conventional control method, the tension roll absorbs a large amount of the fed yarn when the ground yarn is used, and the tension roll absorbs a large amount of yarn during the two revolutions of the ground yarn when using the 3 pick towel. Moves backward and pile formation is performed between the rotation angle of 180 ° to 360 ° of the loom where the third reed beating is performed, and the tension roll rapidly advances to form the pile on the third pick. It was

As described above, in the conventional control method, the tension control of the pile warp yarn required on the towel loom is almost always performed by the movement of the tension roll. In the delivery of the present invention, the amount of rotation of the delivery beam is obtained from the delivery beam diameter, the yarn length, and the pile length, and the required yarn length is delivered according to the rotation speed of the loom. At this time, the pile length is sent out at the required timing as in the case of the ground yarn.

In this way, the length of the ground yarn in the case of the ground yarn and the pile length in the case of the pile are given to the delivery beam by the rotation of the delivery motor. At this time, the movement of the tension roll hardly occurs due to the pile formation, and the opening of the loom is opened. It suffices if the tension roll can absorb only the tension fluctuation due to the movement. Therefore, the tension roll does not have the abrupt movement at the time of pile formation as in the past.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to FIGS. 1 and 2. In FIG. 1, a computer 8 has an initial value of a winding diameter of a warp thread 16 shown in FIG. The winding diameter setting device 9 for setting is connected. In addition, the loom rotation signal and the signal from the pulse oscillator 6 mechanically connected to the delivery motor 5 are taken in to calculate the winding diameter, and the winding diameter of the delivery beam 7 is constantly calculated by the computer 8 while the loom is operating. .

The calculated winding diameter signal is sent to the calculator 2 and is calculated by the feed amount setting device 1 to the speed set to the ground yarn length and the pile length speed in consideration of the loom speed, and when the loom operation signal comes. A speed signal corresponding to the length of the ground yarn is output to the motor driver 4 through the speed signal addition point 3, and when a pile signal comes, a speed signal corresponding to the pile length is added at the pile formation timing at the speed signal addition point 3. Through to the motor driver 4.

The motor driver 4 gives a voltage necessary for the speed of the delivery motor 5, and the delivery motor 5 rotates. At this time, the pulse oscillator 6 and the pile delivery beam 7 mechanically connected to each other also rotate. The motor driver 4 feeds back the signal of the pulse oscillator 6 to stabilize the sending speed. On the other hand, the signal from the pulse oscillator 6 is also used to detect the winding diameter of the pile delivery beam 7, and is connected to the computer 8.

In FIG. 2, the pile delivery beam 7 is shown in FIG.
When the pile is piled, the motor 5 rotates at a speed corresponding to the length of the pile and when the pile is piled, the warp thread 16 passes through the tension roll 13 to the opening side of the loom (not shown). Sent out. At this time, the opening movement of the loom is performed once per rotation of the loom, and the tension of the warp thread 16 changes. To absorb this, the tension roll 13 is held by the rod 10 from the fulcrum 11 and can swing. There is.

The tension roll 13 is connected to the loom fixing portion 15 via a spring 14 so as to be balanced with the tension of the warp yarn 16. This absorbs the tension fluctuation of the opening movement and the sending control error.
In order to detect the movement of the tension roll 13, the rod 1
A linear proximity switch 12 is provided near 0.

This is to correct the value calculated by the calculator 2 and the amount of yarn actually used. The feeding speed is increased when the tension is high, and is decreased when the tension is low. It acts on the speed signal addition point 3 in FIG. This linear proximity switch 12 makes the delivery speed more stable. By controlling the pile feeding device in this manner, the movement amount of the tension roll 13 can be extremely reduced during pile formation, and the tension fluctuation can be reduced.

Referring to FIG. 3, which is a comparative conceptual diagram of the conventional delivery rate from the delivery beam and the delivery rate of the present invention, where the conventional rate is compared to the average rate delivery and is required in the present invention. The delivery speed corresponds to the length. As described above, pile formation is performed between the rotation angle of 180 ° and 360 ° of the loom in which beating is performed by both the cloth moving type and the reed moving type, and the warp yarn is fed at a high speed during this period.

Although the present invention has been described based on the concept of speed, it may be controlled by a digital amount corresponding to the length. Although the delivery amount setting device 1 is set to data including the loom rotation speed data, it is also possible to directly fetch the loom rotation signal into the computer 2. The winding diameter of the pile delivery beam 7 may be detected by another known method, and the scope of the present invention is not limited to the embodiments described herein.

[0015]

According to the present invention, the tension roll 13 does not have to be controlled by a motor, and can be manufactured at low cost simply by changing the conventional control method using electric feed. Since the movement of the tension roll 13 is reduced, the bending of the central portion of the tension roll 13 is small and the yarn disorder is small. Tension tracking at the loom side during pile formation is improved and a clean pile can be formed.

[Brief description of drawings]

[Fig. 1] Block diagram of control device

[Fig. 2] Mechanical mechanism diagram of the sending part

[Figure 3] Conceptual diagram of feed rate comparison

[Explanation of symbols]

1 Output amount setting device 2 calculator 3 Speed signal addition point 4 motor driver 5 Delivery motor 6 pulse oscillator 7 Pile delivery beam 8 calculator 9 Roll diameter setting device 10 rod 11 fulcrum 12 Linear proximity switch 13 Tension roll 14 spring 15 Loom fixed part 16 warp threads

Claims (2)

[Claims] 1. A winding diameter of a delivery beam is calculated in an electric delivery device of a towel loom, and the set ground yarn feed amount and pile feed amount are calculated based on a loom operation signal and a pile signal. , A method of controlling each of the sending motors by converting them into a speed signal at required timing. 2. The method according to claim 1, wherein the position of the tension roll is detected and the velocity signal is corrected.