JPH04126847A - Control device for weft inserting of weaving machine - Google Patents

Abstract

PURPOSE:To properly repair bad weft inserting by increasing pressure applied to a nozzle when a reeling speed value of weft is out of a given range during weft inserting. CONSTITUTION:When bad weft inserting is judged by a signal from a filler 20 and a reeling speed value of weft by a weft reeling sensor 7 is out of a given range, bad weft inserting based on change of feed yarn is judged, pressure fed to nozzles 9 and 17 is increased and pulling force of weft 5 is strengthened.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a weft insertion control device for a loom, and is particularly suitable for preventing weft insertion errors when switching the weft feeder. The present invention relates to a weft insertion control device for a loom.

(Prior Art) Some looms are provided with a preliminary yarn feeder in order to smoothly replace the yarn feeder around which the weft is wound.

Then, the pick tile of the yarn supplying body and the weft tip of the preliminary yarn supplying body are connected, and when the weft wound around the original yarn supplying body runs out, the weft yarn is continuously pulled 111 from the preliminary yarn feeding body. ing.

However, the surface of the weft yarns of these yarn feeders is exposed to the outside air more than the center area during storage, so the weft yarns become moist and heavy due to factors such as air ejected from the nozzle. When flying, there are cases where a larger traction force is required on the surface area than on the center area. In addition, the larger the outer diameter of the yarn supplying body, the greater the unwinding resistance due to ballooning, that is, the diameter of the whirling when the weft is unwound.
Similarly, greater traction forces are required.

As a proposal to solve this problem, JP-A-58-1
．． The one described in Japanese Patent No. 8446 is known. As shown in Fig. 3, this proposal connects the tail end Y of the weft yarn 5 wound around the yarn feeder 4a and the tip X of the weft yarn 5 wound around the preliminary yarn feeder 4b by tying it with a knot Z. A sensor 3 that is electrically activated to detect the weft yarn 5 is installed near this connecting part.
0 is set. When the weft yarn 5 wound around the yarn supply body 4a is consumed and switched to the preliminary yarn supply body 4b, the weft yarn 5 moves from the position shown by the solid line to the position shown by the broken line. At this time, the weft 5 passes over the sensor 30, and the sensor 3
0 generates signal 31. In response to this signal 31, a solenoid valve (not shown) provided in the air tank 10 that sends compressed air to the main nozzle 9 is adjusted via an electronic circuit 32, and the air pressure ejected from the main nozzle 9 is increased to increase the pulling force of the weft. are doing. In the figure, reference numeral 33 is a main drive device, reference numeral 34 is a loom, and reference numeral 3 is a weft storage drum.

(Problem to be Solved by the Invention) However, the properties of the weft yarn 5 wound around the yarn supplying body 4 do not change much between the surface part and the center part depending on the yarn type and the storage condition of the yarn supplying body. Sometimes. In such a case, according to the conventional means described above, the pressure of the air jetted from the main nozzle 9 becomes higher than necessary. As a result, especially when the weft yarn 5 is a filament yarn, filament cracking may occur and the quality of the work may be degraded. In addition, if the weft flying speed or tension is too high, the weft 5 has some elasticity, so it shrinks after reaching the anti-weft insertion side and stretches completely, and when it returns largely to the weft insertion side, it is beaten. There was also a risk that the cloth would sag. In such cases, there is no simple detection method that can detect fabric conditions such as sagging of the fabric, so the fabric is woven as is.

The present invention has been made in view of the above points, and is a weft weaving machine that can correctly determine whether or not the cause of weft insertion failure is due to switching of the yarn feeder and properly repair the weft insertion failure. The purpose of this invention is to provide a control device.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a length measuring device that winds and stores a weft yarn on a drum, and a length measuring device that increases the unwinding speed of the weft yarn from the drum of the length measuring device. A weft inserter for a loom, comprising a detecting means, a nozzle for inserting the unwound weft by pressurized air, and a means provided on the opposite side of the weft inserter for detecting the arrival of the inserted weft. In the control device, when it is determined that weft insertion is defective based on the signal from the weft reaching means, it is determined whether the detected value of the weft unwinding speed detecting means is within a predetermined range, and when it is outside the predetermined range, the nozzle The present invention is characterized in that a control means is provided for instructing to increase the supply pressure of pressurized air to the air conditioner.

(Function) According to the above configuration, when it is determined that there is a weft insertion failure based on the signal from the weft arrival detection means, and when the weft unwinding speed value detected by the weft unwinding speed detection means is outside a predetermined range, weft insertion failure occurs. It is determined that the cause of this is due to switching of the yarn supply body, and the supply pressure to the nozzle is increased. As a result, the pulling force of the weft by the pressurized air increases, and weft insertion can be performed reliably.

(Example) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a configuration diagram showing a weft insertion mechanism of an air injection loom to which the present invention is applied. In FIG. 1, parts corresponding to those of the conventional example shown in FIG. 3 are designated by the same reference numerals. The length measuring device 1 is provided with a rotating yarn guide 2 that is rotationally driven by a motor (not shown) and a weft storage drum 3 that rotatably supports the rotating yarn guide 2 on the same axis. is rotated to wind the weft 5 supplied from the yarn supplying body 4a or 4b around the weft storage drum 3. The weft storage drum 3 is provided in a fixed and stationary state, and a length measuring mold 6 is provided on the outer peripheral surface of the drum 3, which is driven by a solenoid and locks the weft 5 wound around the outer periphery of the drum 3.
is set up so that it can be entered and exited. Further, a weft release sensor 7, which is a weft unwinding speed detecting means, is provided adjacent to the length measuring die 6, and counts the number of turns of the weft thread 5 pulled out from the weft storage drum 3, and measures the number of turns of the weft thread 5 pulled out from the weft storage drum 3. When pulled out, the length measuring wind 6 locks the weft 5.

The weft yarn 5 pulled out from the weft storage drum 3 is guided to a main nozzle 9 through a yarn guide 8. The main nozzle 9 has a first air tank 10 which is pressurized air supply means.
Compressed air is supplied from the main nozzle 9 through the electromagnetic valve 11, and the electromagnetic valve 11 opens and closes at a predetermined main axis angle and at a predetermined timing according to a signal from the control device 26, and is injected from the tip of the main nozzle 9 toward the reed blades 12. be done. The weft yarn 5 guided by the main nozzle 9 is then flown toward the guide groove 12a formed in the reed feathers 12.

Here, pressurized air from an air pressure supply source (not shown) is connected to the air tank 10 via an electromagnetic valve 50, and by opening and closing the valve 50, the inside of the air tank is controlled to a predetermined constant pressure. Ru.

Kotoba 12 is a thread sword shirt! - It is attached to the upper end of the thread sword 14 which reciprocates at a predetermined angle by means of 13. The thread sword shaft] 3 is reciprocated by a main shaft 15 of the loom via a mechanism not shown, and the main shaft 15 is provided with an angle sensor 16 for detecting its rotation angle. Note that only the thread sword 14 portion is shown as a side view for ease of explanation.

Auxiliary nozzles 17 are provided at predetermined intervals from the weft insertion side (main nozzle side) to the weft insertion side with respect to the reed blades 12 attached to the thread swords 14 in parallel. These auxiliary nozzles 17, like the main nozzle 9, are supplied with compressed air from the second air tank 18 through the electromagnetic valve 19, and the electromagnetic valve 19 is operated at a predetermined main axis angle by a signal from the control device 25. The weft yarn 5 is made to fly by opening and closing at the right timing and spraying from the tip of the auxiliary nozzle 17.

Here, like the air tank 10, the second air tank 18 is also connected to an air pressure supply source (not shown) via an electromagnetic valve 51. Further, a tweeter 20 which is a weft arrival detection means for detecting the arriving weft yarn 5 is provided on the side opposite to the weft insertion side of the reed feather 12, and an air injection nozzle 21 and a weft suction pipe 22 are further provided on the side opposite to the insertion side of the tweeter 20. A weft traction device 23 is provided. The air jet nozzle 21 injects air to suction the weft yarn 5 in the direction of the weft suction pipe 22 to apply tension to the weft yarn 5 or to remove defective yarns when weft insertion is defective.

The air jet nozzle 21 is opened and closed by a solenoid valve 24.

In addition, the length measuring wind 6, the weft unwinding sensor 7, and the electromagnetic valve 1
1, 19, 24, 50, 51, the angle sensor 16, and the tweeter 20 are each electrically connected to a control device 25, and their respective operations are controlled. Furthermore, the control device 25 stores a table of the relationship between the weft unwinding speed and the nozzle pressure value determined through experiments for each type of weft. If it is slower than the specified value, the solenoid valve 50 is operated to increase the pressure in the air tank to a predetermined value, thereby increasing the pressure in the main nozzle 9, so that the weft unwinding speed automatically falls within a predetermined range. . In this case,
The pressure in the auxiliary nozzle 17 may be increased by instructing the operation of the electromagnetic valve 51.

Next, the operation of this embodiment will be explained with reference to the flowchart shown in FIG. First, in step 101, the tweeter 20
When the loom detects a short pick, which is a defective weft insertion, the loom stops operating. The weft unwinding speed at this time is detected by the weft unwinding sensor 7, and it is determined in step 102 whether this speed is within a predetermined range. If the speed is slow and outside the predetermined range, in step 103, the controller 25 uses the table 104 to increase the nozzle pressure so that the weft unwinding speed falls within the predetermined range.

If it is determined in step 102 that the weft unwinding speed is within the predetermined range, or if the nozzle pressure is increased in step 103 and the weft unwinding speed is within the predetermined range, the short pick is repaired in step 105. Restart. This repair involves reversing the main shaft of the loom, widening the warp opening, exposing the defective weft, and then opening the main nozzle 9.
This is a so-called auto-start operation in which compressed air is injected from the weft to remove and cut defective weft yarns.

Short picks also occur when there is a warp shedding failure, but if the weft unwinding speed is slow at this time, it is determined that the cause of the short picks is switching between the yarn feeders 4a and 4b. On the other hand, if the state of the weft does not change when the yarn supplying bodies 4a and 4b are switched, short picks will not occur and the nozzle pressure will not be increased. Therefore, the problems encountered in the prior art can be solved. That is, according to the present embodiment, when a short pick occurs, it is determined whether the cause is due to switching of the yarn supplying body 4,
Only when switching of the yarn feeder 4 is the cause, the nozzle pressure can be increased to correct the weft insertion defect. Note that instead of the electromagnetic valves 50 and 51, an electric regulator may be used to adjust the pressure of the air tank.

〔Effect of the invention〕

As explained above, according to the present invention, when the weft arrival detection means detects a weft insertion failure and the weft unwinding speed is outside a predetermined range, the supply pressure to the nozzle is increased. Only when the cause of the weft insertion failure is due to switching of the yarn feeder, the nozzle pressure can be increased to ensure weft insertion without cracking the weft yarn or causing defects in the woven fabric.

[Brief Description of the Drawings] Fig. 1 is a configuration diagram showing a weft inserting mechanism of an air injection loom to which an embodiment of the present invention is applied, Fig. 2 is a flow diagram illustrating the operation, and Fig. 3 1 is a configuration diagram showing a conventional weft insertion mechanism. 1... Length measuring device 5... Weft 7... Weft unwinding speed detection means (weft release sensor) 9.
・Main nozzle (nozzle) 10... Pressurized air supply means (air tank) 17...
Auxiliary nozzle (nozzle) 20... Weft arrival detection means (feeler) 25... Control means (control device)

Claims (1)

[Scope of Claims] A length measuring device for winding and storing a weft yarn on a drum; a means for detecting the unwinding speed of the weft yarn from the drum of the length measuring device;
A weft insertion control device for a loom, comprising: a nozzle for inserting the unwound weft yarn using pressurized air; and a means provided on the anti-weft insertion side for detecting arrival of the inserted weft yarn; When it is determined that weft insertion is defective based on the signal from the weft arrival detection means, it is determined whether the detected value of the weft unwinding speed detection means is within a predetermined range, and when it is outside the predetermined range, pressure is applied to the nozzle. 1. A weft insertion control device for a loom, comprising a control means for issuing an instruction to increase air supply pressure.