JPS62257439A - Wefting method in jet 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 OBJECTS OF THE INVENTION (INDUSTRIAL APPLICATION'IF) The present invention relates to a method of controlling the injection timing and injection pressure of an injection fluid that makes weft yarns fly.

(Prior art) A plurality of auxiliary nozzles are arranged along the flight path of the weft yarn that is injected from the main weft insertion nozzle into the warp opening and inserted,
In the weft insertion method in which the weft is caused to fly by relay jetting from these auxiliary nozzles, fluid jetting pressure or relay jetting control at the auxiliary nozzle is extremely important in improving weft insertion stability.

Therefore, in the weft insertion method disclosed in Japanese Patent Application Laid-Open No. 56-96938, a weft detector is installed at the end of the weave width.
The preset weft tip arrival timing at this weft detector installation position is compared with the actual weft tip arrival timing, and the fluid injection pressure is controlled based on the comparison result. In addition, in the weft insertion method disclosed in Japanese Patent Application Laid-Open No. 58-36242, the tip of a flying weft is detected by a weft detector, and based on this detection signal, an auxiliary nozzle downstream of the weft detector is activated to eject the weft. It controls the timing. That is, the pulse motor for controlling the opening and closing of the mechanical pulp, which controls the injection timing in the auxiliary nozzle, receives a predetermined operation command from the control circuit based on the weft tip detection signal from the weft detector, thereby opening and closing the mechanical valve. controlled.

In this control process, due to the responsiveness of the pulse motor, the length of the fluid conduit, etc., a delay time occurs between the time when the weft tip detection signal is sent and the time when the fluid is injected from the auxiliary nozzle. Therefore, the auxiliary nozzle whose injection timing is controlled by the weft tip detection signal is moved downstream from the weft detector by at least a distance corresponding to the delay time and the weft flying speed, and the fluid injection start timing at the same position is determined. and the time when the weft tip reaches the end are synchronized.

(Problems to be Solved by the Invention) However, in the weft insertion method using the injection pressure control method disclosed in Japanese Patent Application Laid-open No. 56-96938, the weft tip end set in advance is The injection pressure control based on the comparison between the arrival time and the actual weft tip arrival time is actually effective after a considerable number of weft insertions have been made from the detection time by the weft detector, and the weft flight time is set. It is virtually impossible to converge within the specified range.

Moreover, since the injection timing for each auxiliary nozzle is set to be unadjustable, the injection time width must be set large in consideration of variations in weft flight time caused by injection pressure fluctuations, which wastes injection fluid. is unavoidable.

On the other hand, according to the weft insertion method disclosed in Japanese Patent Application Laid-open No. 58-36242, injection timing control in an auxiliary nozzle located a predetermined distance downstream from a weft detector within the weaving width is based on the detection of the weft tip by the weft detector. Although this is possible for each weft insertion, this timing control ultimately depends on the weft flying speed. Therefore, for example, if the weft flight is slow, the injection timing control is performed in accordance with this slow flight, and the delay in the weft flight cannot be eliminated. Therefore, unless the operator controls the injection pressure, the occurrence of weft insertion troubles is unavoidable.

Structure of the Invention (Means for Solving Problems) Therefore, the present invention provides a weft detector for detecting the tip of the weft that is guided in flight within the warp shedding by the jetting fluid from the main nozzle for weft insertion and the auxiliary nozzle. The jetting timing of the auxiliary nozzle is controlled based on a comparison between the weft tip position information detected by the weft tip detected by this weft detector and a preset weft tip arrival time. The injection pressure of at least one of the main nozzle and the auxiliary nozzle is controlled.

(Function) That is, based on the comparison between the weft tip position information detected by the weft tip of the weft detector and the preset weft tip arrival time (until the fluid injection pressure control becomes actually effective, The injection timing control in each auxiliary nozzle based on the comparison result has the weft flying control.Therefore,
The weft tip detection result by the weft detector is immediately reflected in subsequent weft insertion, and weft flight is well controlled. When the injection pressure control starts to be reflected in weft insertion, it becomes possible to control the injection timing in a state where the consumption of the injection fluid is the least, and it is possible to avoid wasting the injection fluid while ensuring flight stability of the weft yarn. .

(Example) Hereinafter, an example in which the present invention is embodied in a jet loom equipped with a weft length measurement and storage device of a winding storage type will be described with reference to FIGS. 1 to 3.

As shown in FIG. 1, a weft guide path S is formed in the front of the reed 2 that is installed upright on the slay 1, and the weft Y that has passed through the weft length measuring and storage device is passed from the main nozzle 3 for weft insertion. The weft is inserted into the weft guide path S. The weft insertion main nozzle 3 is connected to a compressed air supply tank 23 via an electromagnetic valve 22, and an electromagnetic regulator 35 for pressure control is attached to the tank 23. Slay 1
A mounting groove 1a is formed on the front surface of the mounting groove 1a, and a plurality of support blocks 4 (16 in this example) are formed in the groove 1a.
(Only six pieces are shown in the drawing) are tightened and fixed at predetermined intervals so that their mounting positions can be adjusted.

Each block 4 has auxiliary nozzles 5A, 5B, and 6A.

6B, 7A, 7B, 8A, 8B, 9A, 9B, 10A,
IOB, IIA, IIB, 12A, 12B are supported upright, and these auxiliary nozzles 5A to 12B are connected to compressed air supply tank 21 via electromagnetic valves 13, 14, 15.16° 17, 18, 19.20. It is connected to the. Each of the auxiliary nozzles is connected to one electromagnetic valve in adjacent pairs in order from the side of the main weft insertion nozzle 3.

A support block 24 is fastened to the mounting groove 1a between the pair of auxiliary nozzle groups 5 and 6 so that the mounting position can be adjusted, and the support block 24 includes a pair of rod-shaped supports 25A, 25B is erected and supported. The tips of both supports 25A and 25B reach the vicinity of the weft guide path S, and a light projecting element (when shown) is embedded in the tip of one support 25A, and the other support 25B
A light-receiving element (as shown) is embedded at the tip.

That is, the pair of supports 25A and 25B constitute a weft detector 25 that detects the weft Y flying in the weft guide path S. Similarly, between the pair of auxiliary nozzle groups 6 and 7,
7.8 hours, 8.9 hours, 9. Support blocks 24 are also arranged between 10, 10.11 and 11.12 so that their mounting positions can be adjusted, and each support block 24 is equipped with weft detectors 2G, 27, 28, 29, 30.31 is installed. All of these weft detectors 25 to 31 are located within the weaving width. Furthermore, a support block 24 is fastened and fixed to a mounting position 11a corresponding to the vicinity of the outer weave width end of the auxiliary nozzle group 12 so that the mounting position can be adjusted. 32 is installed.

As shown in FIGS. 1 and 2, the weft detection signals output from each of the weft detectors 25 to 32 are input to the control word 2c. The control device C controls input/output ink faces, a CPU (central processing unit), set opening/closing timings in electromagnetic valves corresponding to each auxiliary nozzle group, and weft detectors 25 to 3.
It is composed of a storage section that stores the set weft tip arrival time at one position and stores the set jetting timing inputted by the jetting timing setting 533 shown in FIG. 2. The injection timing setter 33 is for setting only the opening/closing timing of the electromagnetic valve 22 corresponding to the weft insertion main nozzle 3 and the electromagnetic valve 13 corresponding to the auxiliary nozzle group 5, and these opening/closing timings are set as shown in FIG. It is set based on the input of the set weft flight start angle α and the set weft flight end angle β. The control device C receives a weft tip detection signal from the weft detectors 25 to 32, an input signal from a known rotary encoder 34 for detecting the rotation angle of the machine, and a timing set in advance by the injection timing setting device 33. Based on the weft flight start angle α and the weft flight end angle β, commands are given to open and close the electromagnetic valves 14 to 20 corresponding to the auxiliary nozzle groups 6 to 12, and the electromagnetic valves 13 and weft insertion corresponding to the auxiliary nozzle group 5 are The command to open and close the electromagnetic valve 22 corresponding to the main nozzle 3 is given in accordance with the opening and closing timing preset by the injection timing setter 33. Further, the control device C controls the pressure control electromagnetic regulator 35 based on a comparison between the weft tip position information from the weft detector 32 and a preset weft flight end angle β.

Now, as the loom is operating, the solenoid valve 22 operates at the opening/closing timing (third timing) set by the injection timing setting device 33.
(shown as block T1 in the figure). As a result, compressed air is injected from the main nozzle 3 for weft insertion, and the weft Y
is ejected and inserted into the weft guide path S. Subsequently, the electromagnetic valve 13 is opened at a set opening/closing timing (shown by block T2 in FIG. 3), and the tip of the weft Y is pulled by the auxiliary nozzle group 5. When the tip of the weft Y reaches the weft detector 25 between the auxiliary nozzle groups 5 and 6, the tip of the weft Y is detected by the weft detector 25, and this weft tip detection signal is input to the control device C.

The control device C grasps the arrival time of the weft tip at the weft detector 25 position based on the signal from the row reencoder 34, and stores it. Hereinafter, the electromagnetic valves 14 to 20 are operated at the set opening/closing timing according to commands from the control device (shown as T3.T4.T5°T6.T7.T8.T9 in FIG. 3).
The weft yarn Y is pulled and flung by relay injection from each of the auxiliary nozzle groups 6 to 12. Then, the tip of the weft Y is detected by each of the weft detectors 26 to 32, and the timing at which the weft tip reaches each of the weft detectors 26 to 32 1 is grasped and stored in the control device C in the same manner as described above.

If normal weft insertion is performed in which the tip of the weft Y reaches the weft detector 32 position at the time indicated by the preset weft flight end angle β, the weft insertion main The injection pressure in the nozzle 3 and the injection timing in each of the auxiliary nozzle groups 6 to 12 are commanded by the control device C as in the previous case. In other words, no change command is given to the pressure control electromagnetic regulator 35 and the electromagnetic valves 14 to 20, and the injection pressure and electromagnetic valves 14 to 20 are the same as before.
Preset opening/closing timings T3 to T9 in 20
With this, weft insertion is performed.

If abnormal weft insertion is performed in which the tip of the weft Y does not reach the weft detector 32 position at the time indicated by the preset weft flight end angle β, the pressure control electromagnetic regulator 35 is controlled by the control device C. A pressure correction command is sent to. Along with this, the opening/closing timings T3 to T are set based on the comparison between the weft tip position information obtained by the weft detectors 25 to 31 and the preset weft tip arrival timing.
The opening/closing timing corrected by 9 is commanded to the electromagnetic valves 14 to 20. The injection pressure correction in the main weft insertion nozzle 3 starts to work effectively after a considerable number of weft insertions have been made since the injection pressure correction command was issued. During this time, weft thread flight control is controlled by opening/closing timing correction in the electromagnetic valves 14 to 20. The receiver is held, and the weft flight can be optimized immediately after the injection pressure correction command and the opening/closing timing correction command are sent.

Therefore, the occurrence of weft insertion errors until the injection pressure correction becomes effective is avoided, and the quality of the woven fabric and the operating efficiency of the machine are improved.

When the injection pressure correction in the main weft insertion nozzle 3 starts working effectively, the opening/closing timings of the electromagnetic valves 14 to 20 corresponding to the auxiliary nozzle groups 6 to 12 converge to the set opening/closing timings T3 to T9, and the subsequent The bridge is held by the injection pressure that has been corrected for weft flight control. Therefore, depending on the settings of the injection timings T3 to T9, it is possible to significantly reduce the amount of consumption of the injection fluid.

Of course, the present invention is not limited to the above-mentioned embodiments. For example, in the above-mentioned embodiments, weft tip position information obtained from one weft detector within the weaving width and weft tip position information before the same position information. Based on this, the injection timing at an auxiliary nozzle located a predetermined distance downstream from the weft detector may be controlled. Furthermore, as shown in FIG. 4, a weft detector 32 is installed only near the end of the weaving width, and based on the weft tip position information obtained from the weft detector 32, electromagnetic valves corresponding to the auxiliary nozzle groups 5 to 12 are installed. 13
The relay injection timing is controlled by directly controlling the opening/closing timing of the weft inserting main nozzle 3 and the auxiliary nozzle groups 5 to 12 based on the weft tip position information. It is also possible to control both of the electromagnetic regulators 36 for injection pressure control at the same time, or to control the injection pressure only for the auxiliary nozzle group.

Effects of the Invention As detailed above, according to the weft insertion method of the present invention that performs both injection pressure control and relay injection timing control in the auxiliary nozzle, weft insertion stability is improved while reducing the consumption of injection fluid. It has excellent effects.

[Brief explanation of drawings]

1 to 3 show an embodiment embodying the present invention.
The figure is a perspective view showing the auxiliary nozzle row and the weft detector row.
The figure is a block diagram, and Figure 3 is a graph showing the weft flight curve.
FIG. 4 is a block diagram showing another example of the present invention. Main nozzle 3 for weft insertion, auxiliary nozzles 5A, 5B, 6A
, 6B, 7A, 7B, 8A, 8B, 9A. 9B, IOA, IOB, IIA, IIB, 12A. 12B, electromagnetic valve 13, 14, 15, 16, 17.1
8.19°20.22, weft detector 32, pressure control electromagnetic regulator 35, weft Y.

Claims (1)

[Claims] 1. A weft detector is placed near the end of the weaving width to detect the tip of the weft that is guided in flight through the warp shedding by the jet fluid from the main nozzle for weft insertion and the auxiliary nozzle, and the weft tip is detected by this weft detector. a jet loom that controls the injection timing of the auxiliary nozzle based on a comparison between weft tip position information and a preset weft tip arrival time, and controls the injection pressure of at least one of the weft insertion main nozzle and the auxiliary nozzle; Weft insertion method.