JPH0380899B2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field of the Invention [0001] The present invention relates to a drum-type weft yarn length measurement and storage device, and in particular to a device for automatically controlling the amount of weft yarn wound around a drum to a predetermined number of turns before the start of operation of a loom. related to the equipment.

BACKGROUND OF THE INVENTION In this type of drum-type weft yarn storage device, the weft yarn required for weft insertion is retained by a pin, and is always preliminarily stored on the outer peripheral surface of the drum in excess of the number of turns required for weft insertion. A part of the weft yarn in this stored state is released by moving the pin in the release direction, and is wefted into the weft by the weft insertion nozzle by one pick.

By the way, it is necessary to preliminarily wind the weft yarn in an optimum amount around the outer peripheral surface of the drum before starting operation of the loom, for example, at the time of fitting. On the Isshiki loom,
Since wefting is performed every rotation of the loom, the required amount of winding can be easily determined at the time of fitting. However, in multi-color looms, a certain weft thread is not weft-inserted every revolution of the loom, so it is determined whether or not the weft thread wound around the drum will be weft-inserted immediately after the weaving of a certain weft thread. Not yet.

If the optimal weft yarn is not wound around the drum circumferential surface during matching for a certain weft yarn, there will be an excess or deficiency in the weft yarn stored on the drum circumferential surface when the loom starts operating. For example, if an excess of weft yarn is wound on the drum, the movement of the weft yarn on the drum will not be smooth, resulting in overlapping of the yarns and resistance to release of the weft yarn at the time of weft insertion. A horizontal insertion error occurs. On the other hand, if the amount of wrapping is insufficient at the time of weaving, the weft thread will not reach the end of the fabric during weft insertion, resulting in short picks, and if there is insufficient winding between the drum circumference and the stored weft thread. Due to the lack of friction and slippage during winding of the weft thread, the length measurement function is incomplete and the weft insertion length is not constant. In this way, the drum-type weft yarn storage device
If the amount of preliminary winding of the weft thread is to be always constant, it must be set to the optimum winding amount.

OBJECTS OF THE INVENTION It is therefore an object of the present invention to automatically provide an optimum amount of winding of the weft thread around the drum before the start of operation.

SUMMARY OF THE INVENTION Therefore, the present invention stores in advance an appropriate amount of winding for each edge alignment phase of a weft insertion pattern, and also determines which phase of the width insertion pattern the edge alignment is in at the time of actual edge alignment. The weft thread is preliminarily wound on the drum in an amount corresponding to a preset winding amount based on the content of the judgment. The drive source for such preliminary winding is provided separately from the drive system of the drum-type weft yarn storage device which is driven by the drive source of the loom. For this purpose, a one-way clutch or the like is provided between the drive source for prewinding, the drive shaft of the loom, and the drum type weft storage device.

Structure of the Invention The present invention will be specifically described below based on an embodiment shown in the drawings.

First, FIGS. 1 and 2 show a two-color drum type weft yarn storage device 1. Two drum-type weft yarn storage devices 1 are provided in parallel corresponding to two colors. This drum type weft yarn storage device 1
The main parts are the winding arm 2 and the storage drum 3.
and a locking pin 4. Wrapping arm 2
is rotatably supported on a frame 17 or the like, and inside the thread guide 15 is connected from the thread feeder 6 to the thread guide 15.
You will be guided through the process. Weft thread 5a or weft thread 5b
is pulled out and sequentially wound around the outer periphery of the storage drum 3 by rotational movement. This storage drum 3 is rotatably supported at a position concentric with the winding arm 2, but is stopped when the winding arm 2 rotates. The locking and releasing of the weft yarns 5a and 5b on the circumferential surface of the storage drum 3 is controlled by the locking pin 4. That is, when the locking pin 4 is inserted into the recessed portion of the circumferential surface of the storage drum 3, the weft threads 5a and 5b are locked therein. However, when the locking pin 4 retreats from the circumferential surface of the storage drum 3, the stored weft yarns 5a, 5b are immediately released and can be inserted through the yarn guide 16. The lengths of the weft threads 5a and 5b at this time can be set by the retraction time of the locking pin 4.

The rotational movement of the winding arm 2 is provided by a rotating shaft 19 of the loom. That is, the rotation of the rotating shaft 19 is transmitted to the drive shaft 7 via, for example, an electromagnetic clutch 18, and the rotation of the drive shaft 7 is transmitted to the drive pulley 8,
A predetermined rotational speed is transmitted to the winding arm 2 by a timing belt 9 and a driven pulley 10.

On the other hand, for example, a DC motor 1 is installed for each winding arm 2 in order to set the winding amount at the time of fitting.
1a and 11b are installed. This motor 11a,
The rotation of 11b is transmitted to the driven pulley 10 by the one-way clutch 12 on the output shaft side, the motor pulley 13, and the timing belt 14. At that time, the aforementioned clutch 18 is disengaged, so that the loom itself does not rotate. The one-way clutch 12 transmits the rotation of the motors 11a and 11b to the winding arm 2.
rotation is not transmitted to the motor 11.

Next, FIG. 3 shows a preliminary winding amount control device 20 of the present invention. This preliminary winding amount control device 20
The motors 11a and 11b are controlled objects,
Phase discriminator 21, pulse controller 22a, 2
2b, and pulse generators 23a and 23b. The phase discriminator 21 is for discriminating the rotation phase or rotation angle of the loom in relation to the weft insertion pattern, and is connected to the sensor 24. This sensor 24 corresponds to a rotary plate 26 attached to the main shaft 25 of the loom, etc., and by detecting the rotational phase or rotation angle of the rotary plate 26, the phase or rotation angle of the weft pattern can be indirectly determined. to be detected. As an example, this rotary plate 26 corresponds to a two-color, two-over-width pattern, and has a rotation speed of 4.
It is divided into equal parts, making one revolution during one repetition of the weft pattern, or one quarter revolution during one revolution of the loom. In addition, A1, A2, B1,
B2 indicates the weft insertion order using the weft threads 5a and 5b, respectively. and the phase discriminator 21
Each output terminal of the pulse controller 22
a, 22b, and these pulse controllers 22a, 22b are connected to the pulse generator 2 via switches 27, 28, 29, 30, respectively.
It is connected to the input side of 3a and 23b. These pulse generators 23a and 23b are connected to corresponding motors 11a and 11b, respectively. The pulse controllers 22a and 22b store information on the required number of turns for each phase in advance, and the pulse generator
Based on the information given by motors 2a and 22b, necessary rotation commands are given to motors 11a and 11b.

Operation of the Invention Next, the operation of the preliminary winding amount setting device 20 will be explained with reference to FIG.

First, FIG. 4 shows the relationship between, for example, the amount (number of turns) of the weft yarn 5a stored on the circumferential surface of the storage drum 3 in relation to the rotational phase N of the loom. As mentioned above, the weft insertion pattern is two-color and two-way, so there are four rotational phases, and the mating weft threads 5b corresponding to the rotational phases N1 and N2 of the loom are inserted. During this time, weft thread 5
a is sequentially wound around the circumferential surface of the storage drum 3. When the loom enters rotational phase N3, seven turns of weft 5a are stored on the circumferential surface of storage drum 3, and by the end of rotational phase N3, two more turns have been stored on the circumferential surface of storage drum 3.
Only one roll can be wrapped. However, in the meantime, the first weft insertion A1 is performed and four turns of the weft yarn 5a are inserted, so that five turns of the weft yarn 5a remain on the circumferential surface of the storage drum 3 at the beginning of the rotation phase N4. Since the second weft insertion A2 is also performed at the rotational phase N4 of the loom, the storage amount Q of the weft yarn 5a is the minimum number of turns 3 immediately after the rotational phase N4 of the loom.
In this way, four turns of the weft yarn of the weft yarn 5a are inserted as one pick of weft yarn length. In this weft insertion process, the minimum number of turns of the weft thread 5a is three turns, and these three turns ensure optimal friction between the weft thread 5a and the outer peripheral surface of the storage drum 3.

By the way, the stitching position P is set for each rotation of the loom, and from the rotational phase N1 to the rotational phase N4.
The amount of winding Q at the mouth-to-mouth position P up to this point changes to 3.5 turns, 5.5 turns, 7.5 turns, and 5.5 turns, respectively. Therefore, for example, when alignment is performed at the rotational phase N2, the circumferential surface of the storage drum 3 is
5.5 turns of weft thread 5a must be wound. Therefore, the sensor 24 determines the rotational phase N2 and sends a unique signal corresponding to the rotational phase to the phase discriminator 21. Here, the phase discriminator 21
determines the rotational phase N2 from its unique signal,
A signal corresponding to the rotational phase is sent to the pulse controllers 22a, 22b. Therefore, the pulse controllers 22a, 22b generate a memory signal of the number of turns corresponding to the rotational phase, and switch the switches 27, 2.
At the closing point of 9, the pulse generators 23a, 23
The state is set such that a command for the number of pulses corresponding to the number of turns required for b can be given. Therefore, in order to align the loom, all the stored weft yarns 5a and 5b are removed from the circumferential surface of the storage drum 3, and the pre-winding switches 27 and 29 are turned on. The combined signals are sent from the pulse controllers 22a and 22b to the pulse generator 2.
3a and 23b. Therefore, the pulse generators 23a and 23b generate drive signals, which drive the motors 11a and 11b, and rotate the winding arm 2 by the required number of windings at the time of matching, so that the outer circumferential surface of the storage drum 3 is The required number of turns of the weft yarns 5a and 5b at the meeting position are wound around the weft yarns 5a and 5b.

In conjunction with turning on the switches 27 and 29, the clutch 18 is automatically disengaged. Furthermore, when the switches 27 and 29 are turned off, the clutch 18 is automatically engaged. The switches 28 and 30 are for inching operation, and the pulse controllers 22a and 22b control the pulse generators 23a and 23b so that when the switches 28 and 30 are pressed once, the winding arm 2 rotates once.
give a signal to In this way, the optimal amount of winding can always be obtained at the mouth-to-mouth position.

Modifications of the Invention In the above embodiment, the drum-type weft storage device 1 of multiple colors is used as an example, but the preliminary winding amount control device 20 can of course be applied to the case of one color. Further, in the above embodiment, the rotational phase of the weft pattern is determined, but in order to ensure even more accuracy, the present invention directly detects the rotational angle of the loom and calculates the amount of winding corresponding to the rotational angle. You may also give it to them. Further, the switches 27 and 29 may be of an interlocking type.

Effects of the Invention In the present invention, the phase of the weft insertion pattern, the rotation angle of the loom, etc. are automatically detected, and the required number of turns of weft yarn is automatically wound on the storage drum based on the detected contents. It is easy to start up after the weaving of the weaving machine, and it is possible to prevent excess or deficiency of weft thread, especially during subsequent operation, and therefore, it is possible to reliably prevent weft insertion errors, making it effective as a weft thread storage device as looms are automated. be.

[Brief explanation of drawings]

Fig. 1 is a front view of the drum-type weft yarn storage device of the present invention, Fig. 2 is a side view of the device, Fig. 3 is a block diagram of the preliminary winding amount control device of the present invention, and Fig. 4 is the rotation of the loom. It is a graph showing the relationship between the phase and the amount of winding. DESCRIPTION OF SYMBOLS 1... Drum type weft yarn storage device, 2... Wrapping arm, 3... Storage drum, 4... Locking pin, 5
a, 5b...Weft thread, 11a, 11b...Motor, 12...One-way clutch, 18...Clutch, 20...Preliminary amount control device of the present invention, 21...
...Phase discriminator, 22a, 22b...Pulse controller, 23a, 23b...Pulse generator, 24
...Sensor, 25...Spindle, 26...Rotating plate.

Claims (1)

[Claims] 1. In a drum-type weft yarn storage device that continuously winds weft yarn on a storage drum and releases the wound weft yarn in accordance with a certain weft insertion pattern, the phase of the weft insertion pattern at that point in time is determined when the weft is aligned. A phase discriminator that discriminates, a rotation setter that generates a rotation command signal of a rotation speed corresponding to the number of turns at a predetermined phase based on the discrimination content of the phase discriminator, and a rotation setter that is driven by the rotation setter, 1. A preliminary winding amount control device comprising: a drive motor for setting a preliminary winding amount that provides necessary rotation to a winding arm;