JP2764419B2 - Weaving method of fluid jet loom - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a weaving method for a fluid jet loom capable of performing optimum weaving according to the flight state of a weft.

<Conventional technology> Conventionally, in order to prevent weft insertion errors and improve the quality of woven fabrics, weft flight status is detected, and the weft flight period occupies a certain ratio during the weaving cycle. There is known an apparatus in which the flight speed of a weft is controlled by changing the pressure of a fluid supplied to an injection nozzle (see Japanese Patent Application Laid-Open No. 56-96938).

The reason for this is to automatically respond to a change in the thread type or the like. That is, for example, when the flight speed of the weft becomes slow due to a change in the yarn type and the arrival timing to the non-weft insertion side is delayed, the closing timing of the warp is usually close. Is in contact with the warp and gets caught, causing a weft insertion error, etc.
This is to prevent this.

<Problems to be Solved by the Invention> However, in such a conventional weaving method, for example, when the weft is a weak yarn having a spun yarn, the flight speed of the weft becomes lower than a reference value. However, if the pressure of the fluid supplied to the fluid ejection nozzle is increased to increase the flight speed of the weft, there is a problem that the traction force on the weft is increased and the yarn may break.

In view of such conventional problems, the present invention provides a weaving method for a fluid jet loom that can always perform proper weaving without causing weft insertion errors or yarn breakage, regardless of the weft flight state. The purpose is to provide.

<Means for Solving the Problems> For this reason, the present invention detects directly or indirectly the arrival time of the weft on the reverse weft insertion side, and changes the opening curve based on this.

In addition, indirectly detecting the arrival time of the weft on the side opposite to the weft insertion side, instead of detecting the arrival time, the flight speed of the weft, the time when the weft is inserted for a predetermined length, the weft from the storage drum, etc. This means that the time for drawing out the predetermined length may be detected.

<Action> According to the above method, for example, when the flight speed of the weft is slow and the arrival timing to the anti-weft insertion side is delayed,
Normally, since the closing timing of the warp is close, the weft comes in contact with the warp and gets caught, resulting in a weft insertion error, but when the arrival timing of the weft is late, In order to prevent the weft from touching the warp to be closed and causing a weft insertion error, the basic opening curve A shown by the solid line in FIG. 1 is changed to another opening curve B shown by the broken line in FIG. This keeps the warp shedding so that the weft is not caught. Thereafter, the closing speed is increased to close at a normal timing, thereby suppressing the influence on the fabric quality.

<Example> An example of the present invention will be described below.

2 and 3 show a weft insertion device of an air jet loom.

In the reed 1, weft guide grooves 3 are formed by rows of concave portions 2 a formed in the reed wing 2. At the time of weft insertion, the weft 5 is injected into the weft guide groove 3 by air injection from the main nozzle 4, and the weft 5 is jetted from the auxiliary nozzles 6 arranged at predetermined intervals along the weft guide groove 3. It is blown and transported one after another.

Here, a weft feeler 7 such as a photoelectric type is provided on the opposite side of the weft insertion path, and detects the arrival of the weft 5 and outputs a signal. Thereby, the arrival time of the weft to the opposite weft insertion side can be known.

 4 to 6 show an opening device.

4 heald frames (heald frames) 11A, 11B, 11C, 11D
Each of the guide grooves 13LA, 13LB, 13LC, 13LD, 13RA, 1 whose both ends are formed inside a pair of left and right frame guides 12L, 12R.
3RB, 13RC, 13RD, and can reciprocate up and down along these 3RB, 13RC, 13RD, and linear motors 14LA, 14LB,
14LC, 14LD, 14RA, 14RB, 14RC, 14RD are incorporated.

Linear motor 14LA, 14LB, 14LC, 14LD, 14RA, 14RB, 14RC, 1
Since the 4RD has the same configuration, the linear motor 14LA will be described as a representative. The linear motor 14LA includes a mover 15 and a stator 16.

The mover 15 is a non-magnetic material made of a copper plate, aluminum, or the like, and is fixed to a side end surface of the heald frame 11A.

The stator 16 is formed, for example, by stamping and forming a tooth and a groove on a silicon steel plate and laminating the plurality of coils, and a plurality of coils are wound in each groove, and the groove 13LA of the frame guide 12L is further recessed. It is located in the place.

Therefore, by controlling the traveling magnetic field of the stator 16,
The vertical movement of the heald frame 11A is controlled.

A top dead center sensor and a bottom dead center sensor are provided for each of the heald frames 11A, 11B, 11C, and 11D.

The top dead center sensor 17 and the bottom dead center sensor 18 of the heald frame 11A will be described as representatives. These are reflection type sensors each including a light emitting diode and a phototransistor, and are provided in the grooves 13LA of the left frame guide 12L. A light-emitting diode and a phototransistor are provided on both inner walls so as to face each other, and are blocked at the top dead center position and the bottom dead center position of the heald frame 11A, respectively. Detect the point position.

 FIG. 7 shows a control device.

The control device is configured to include a CPU 21, a ROM 22, a RAM 23,
The signal from the weft feeler 7, the signal from the shaft encoder 8 for detecting the loom main shaft angle, and the signal from the top dead center sensor 17 and the bottom dead center sensor 18 of each heald frame are input to the PU 21. .

An output signal from the CPU 21 is sent to a pair of left and right linear motors 14LA, 14RA via a motor drive circuit 24. Other linear motors 14LB, 14LC, 14
The drive circuits for LD, 14RB, 14RC, and 14RD are not shown.

FIG. 8 is a flowchart showing the control executed by the CPU 21.

When the weft 5 flies and its tip reaches the front of the weft feeler 7, the weft feeler 7 outputs a weft detection signal. Therefore, the arrival timing (main shaft angle) of the weft is detected based on the signal from the shaft encoder 8 when this signal is output (S1 in FIG. 8).

Next, the arrival timing of the weft is compared with a preset reference angle (S2 in FIG. 8).

Based on the result of this comparison, the linear motors 14LA, 14LB
The closing speed is controlled via. That is, if the actual arrival timing does not exceed the reference angle, control is performed using the basic opening curve A (shown by a solid line in FIG. 1) (S3 in FIG. 8).
If it exceeds, change to another opening curve B (shown by a broken line in FIG. 1) (S4 in FIG. 8).

FIG. 9 shows the state of the warp at 240 ° (the beat at the time of beat is 0 °), and FIG. 10 shows the state of the warp at 250 °. Is the case of another aperture curve. In addition, 25 is an upper thread, 26 is a lower thread, 27 is a weaving cloth, 28 is a woven cloth, and 29 is a warp line.

That is, assuming that the reference angle is 240 ° and the actual arrival timing is 250 °, going along the basic opening curve, the upper thread 2 of the warp at 250 ° as shown by the solid line in FIG.
5 overlaps the concave portion 2a, and the weft during flight comes into contact with this, so that weft insertion error is likely to occur, but in such a case, from the next time, reduce the closing speed in the first half of the closing process. Thus, even at 250 °, the upper thread 25 is prevented from overlapping the concave portion 2a (shown by a chain line in FIG. 10). However, the closing speed is increased thereafter so that the closing timing does not change in order to maintain the quality of the weft yarn. When the actual arrival timing is smaller than the reference, compared to the basic opening curve,
In the first half of the closing step, the closing speed may be increased to catch the weft earlier than the reference, and the closing speed thereafter may be reduced.

<Effects of the Invention> As described above, according to the present invention, weft insertion errors are prevented by changing the opening curve of the warp according to the flight state of the weft, so that the weft insertion is weak. Also, there is an effect that no yarn break occurs.

[Brief description of the drawings]

FIG. 1 is a diagram showing a mode of changing the opening curve, FIG. 2 is a plan view of the weft insertion device, FIG. 3 is a side view of the weft insertion device, FIG. 4 is a front view of the opening device, and FIG. Top view of opening device, sixth
FIG. 7 is a sectional view of a linear motor portion, FIG. 7 is a block diagram of a control device, FIG. 8 is a flowchart showing control contents, and FIGS. 9 and 10 are diagrams showing warp shedding phases. 1 ... reed, 3 ... weft guide groove, 4 ... main nozzle, 5 ...
Weft, 6 ... Auxiliary nozzle, 7 ... Weft feeler, 8 ...
Shaft encoder, 11A, 11B, 11C, 11D …… Held frame, 12L, 12R …… Guide frame, 14LB, 14LC, 14LD, 14
RB, 14RC, 14RD …… Linear motor, 21 …… CPU

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁶ , DB name) D03D 47/28-47/38 D03C 13/00 D03C 19/00

Claims (1)

(57) [Claims] In a fluid jet loom in which a weft is inserted into a warp opening by jetting a fluid from a liquid jet nozzle, the arrival timing of a weft to a non-weft insertion side is detected directly or indirectly. A weaving method for a fluid jet loom, characterized in that the opening curve is changed on the basis of the curve.