JPS63145450A - Method for controlling tension of warp yarn in 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] [Industrial Application Field] This invention relates to a tension control method for warp threads in a loom, particularly a tension control method suitable for controlling the feed rate of loom pile warp threads or ground warp threads for towels. It is related to.

[Conventional technology and its problems]

Generally, a loom is equipped with a tension detection means while the warp is moving, and when the loom rotates and winding begins and the warp becomes tense, the tension detection means moves forward, and this movement detection signal drives the motor to feed the warp. The roll is rotated by the amount of movement, advancing the warp threads forward, and by repeating this, the warp threads are fed while keeping the thread tension constant.

By the way, when a pile is formed using warp yarns as in a towel loom, as shown in FIG.
At the portion t, the feed amount force is 1 less, and the feed amount is increased for the third weft C1 to form the pile D, so a large tension is applied to the pile warp A when driving the third weft C1.

However, in the conventional warp feeding method, only the moving bones of the warp are rotated each time, so the tension of the warp is adjusted intermittently.

For this reason, in towel looms in which the feed amount of the pile warp yarns is not constant, there is a problem in that the pile warp cannot be fed sufficiently during pile formation, resulting in uneven pile height.

This invention was made to solve the above-mentioned problems, and it is a warp tension control for a loom that can average and keep the pile warp feeding amount constant and form piles of uniform height. The purpose is to provide a method.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention provides a loom in which the warp delivery roll is driven by a motor, in which the motor is repeatedly energized by dividing it into a predetermined number of cycles, and the warp The tension fluctuation is detected by a tension roll and a switch, and the off timing within the divided number of cycles is changed according to the warp tension fluctuation by the switch, and the motor is speeded up or decelerated by turning on and off the current. This allows the tension of the warp threads to be controlled.

[Effect]

The tension roll moves to follow the warp tension fluctuations,
This tension roll and switch electrically detect changes in warp tension.

The motor that drives the warp delivery roll is continuously driven by dividing it into a predetermined number of cycles, and the switch that detects the warp drive fluctuation detects the tension within the divided number of cycles. The power to the motor is turned off at a time corresponding to the state.

Therefore, the motor is essentially driven by repeatedly turning on and off, and when the number of energization cycles is large, the speed of the warp delivery roll is increased, and when the number of cycles is small, it is decelerated, allowing the delivery to follow warp tension fluctuations. By doing this, the warp feed amount is averaged and kept constant.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is an explanatory diagram of the towel loom and the warp tension control mechanism, and the pile warp A drawn out from roll 1 and the ground warp B drawn out from roll 2 are connected to tension roll 3, respectively.
．． 4, passes through a reed 5, and is wound onto a winding roll 6.

The motor M that drives the roll 1 of the pile warp yarn A uses a commercial AC power source and is driven via an operation switch 7, a control box 8, and a motor drive circuit 9 to rotate the roll 1 in the sending direction of the pile warp yarn A. It has become.

A tension detection mechanism 10 including a tension roll 3 is provided during the movement of the pile warp yarns A, and is configured to electrically detect tension fluctuations of the pile warp yarns A.

2 and 3 illustrate the specific structure of the tension detection mechanism 10. 1) A tension dock 1) is provided on the movable tension roll 3, and 1) the direction of movement of this dock 1). An acceleration proximity switch S1 and a deceleration proximity switch S2 are arranged at front and rear positions.

When the tension of the pile B yarn A being sent out from the roll 1 becomes tense, the dock 1) moves to the acceleration proximity switch S1 side, and this switch S detects the tension to the pile warp yarn. Further, when the pile warp threads become loose, the dock 1) moves to the deceleration proximity switch 82 side, and the switch S detects the looseness of the pile warp threads.

In order to supply 1ffi power to the motor M, the AC power supply cycle is divided into a predetermined number of cycles and repeated, and within the divided number of cycles, both the proximity switches S and 3 are connected.
In step 2, the tension of the pile warp A is controlled by changing the energization off timing according to the tension fluctuation of the pile warp A, and accelerating or decelerating the motor M by turning on and off the energization. There is.

FIGS. 4A to 4C show waveforms of the AC power source and on/off timing.

For example, even with a 60-cycle AC/IL power supply, it is possible to continuously drive the motor M by dividing the energization to the motor M into cycles of 0.2 seconds as shown in Fig. 4A, and repeating this cycle. Make it.

Further, within the divided number of cycles, the off timing setting by both proximity switches S, , S is performed as follows.

The drive of the motor M according to the intermediate cycle number of the number of cycles divided as shown in FIG. As shown in FIGS. 2 and 3, the proximity switches S and 82 are maintained at exactly intermediate positions so that the proximity switches S and 32 are not activated.

Therefore, when the tension of the pile warp A is such that the dock 1) is located between the proximity switches S and S2, the motor M is not energized within the number of divided cycles as shown in Fig. 4A. , only the reference intermediate setting waveform bone is turned on, the rest are turned off, and this is repeated every divided cycle number.

In addition, in the divided number of cycles, the motor M rotates in the first half with force 1), and in the latter half rotates by inertia and decelerates. matches.

The deceleration proximity switch S2 is set as shown in FIG. 4B. 1lli before the 1 ship intermediate setting wave number? t is connected to turn off.

Therefore, when the tension of the pile warp yarns A is loosened and the dock 1) approaches the deceleration proximity switch S2, and this switch S2 is activated, the number of energization cycles decreases as shown in FIG. 4B.
The motor M has a short forward rotation and a long inertial rotation, resulting in deceleration.

The acceleration proximity switch S, as shown in FIG. 4C, is for turning off the energization after the reference intermediate setting wave number,
When the tension of the pile warp A becomes tight and the dock 1) approaches the proximity switch S1, this switch S1 remains energized while detecting the dock 1).

Therefore, when the tension of the pile warp yarns A becomes high, the rotation of the motor M becomes longer, and the rotation of the roll 1 is accelerated.

In addition, in FIG. 1, only the tension control of the pile warp yarns A is performed, but the tension control of the ground warp yarns B can also be performed in the same manner.

In addition, Fig. 3 shows an excessive thread tension limit switch S3 for stopping the loom during the movement of the pile warp threads A.
The limit switch S4 for stopping the yarn feed is arranged so as to detect the pile warp yarn A.

The warp tension control method of the present invention is carried out using the above-mentioned control mechanism, and when the pile warp A and the ground warp B are wound by the operation of the loom, the motor M whose speed has been adjusted in advance causes the rolls to move. 1 and sends out the pile warp A.

During the towel loom process, the tension of the pile warp yarns A constantly changes, and the tension run roll 3 swings following the change in tension, and the tension switches 1) and proximity switches s, , S2
Detect changes in tonicity.

When the tension on the pile warp yarns becomes tight, the acceleration proximity switch S1 detects this and increases the number of cycles to rotate the motor M; conversely, when the tension becomes loose, the deceleration proximity switch S2 detects this.
reduces the number of cycles.

Therefore, the roll 1 for feeding the pile warp yarns accelerates or decelerates in accordance with the change in the tension of the pile warp yarns A, averages out the feeding agitation of the pile warp yarns A and keeps it constant, and counteracts the increase in tension during pile formation. We can also quickly respond to requests and weave towels with uniform pile height.

〔effect〕

As described above, according to the present invention, the energization of the motor is divided into a predetermined number of cycles and repeated, and within the divided cycles, the timing at which the energization is turned off is changed in accordance with the tension fluctuation, and the warp threads are By accelerating and decelerating the feed, the warp feed amount can be averaged and kept constant, and a constant tension can be maintained from the warp winding diameter to the end, and the pile height can be kept constant. Constant towels can be woven.

Furthermore, since the warp tension is averaged by electrical control of the motor, speed control can be effected at low cost.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing the combination of the loom and control mechanism, Figure 2 is an enlarged front view of the main parts of the same, Figure 3 is a plan view of the same, Figure 4A
Each of C to C is a waveform diagram of a control cycle, and FIG. 5 is an explanatory diagram of terry cloth fabric. 1...Warp delivery roll, 3...Tension roll, 1)...Dock, A...
... Pile warp, B... Ground warp, C...
・Weft, Sr, Sz... Proximity switch. Patent applicant: Tadashi Yoshikawa Agent: Kama 1) Text 2 Figure 2 Figure 5

Claims (2)

[Claims] (1) In a loom in which the warp delivery roll is driven by a motor, the motor is repeatedly energized in predetermined cycles, and fluctuations in warp tension are detected using a tension roll and a switch. The warp tension is controlled by changing the turn-off timing within the divided number of cycles according to the warp tension fluctuation using the switch, and increasing or decelerating the speed by turning on and off the motor. A method for controlling the warp tension of a loom. (2) The drive of the motor according to the intermediate cycle number of the separated number of cycles is made to match the warp delivery speed at the warp intermediate winding diameter of the delivery roll, and the off timing is changed based on this intermediate cycle number. A method for controlling warp thread tension of a loom as described in 2.