JPH0547653B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a device for detecting the flying state of weft yarns in a fluid jet loom.

<Prior art> Conventionally, in air injection looms and water injection looms, in order to determine whether the weft insertion state is appropriate, the weft transfer speed or time is measured, and the supply fluid is adjusted so that the weft transfer speed or time becomes a predetermined value. The pressure and injection timing of the fuel are being changed (see Japanese Patent Laid-Open No. 56-96938).

<Problems to be Solved by the Invention> By the way, in order to measure the weft transfer speed or time, a weft detector is provided along the weft transfer path, that is, from the main nozzle to the point where the weft tip reaches. When detecting the arrival timing of the weft yarn, there are various types of weft detectors such as photoelectric type and electrostatic type. Since this is difficult due to location and sensitivity, it is common practice to detect the arrival of the weft tip on the outside of the warp row opposite to the weft insertion.

In this case, a weft detector is installed outside the warp row on the opposite side of the weft insertion to stop the loom in the event of a weft insertion error, so it may be possible to use that as a substitute, but it can also be used to detect the presence or absence of weft. When detecting the arrival timing, it is necessary to adjust the sensitivity to suit each case, and it is preferable to make the detection system independent, including the processing system.

However, if they are made independent, the two weft detectors will be arranged on the outside of the warp row on the anti-weft insertion side.
There is a problem in that the waste thread becomes longer.

In addition, regarding weft detection on the opposite side of weft insertion, the tip of the weft is not restrained and always vibrates, so the detection signal is not stable and there is a difference between the arrival timing and the detection timing. In many cases, it is fine to detect only the presence or absence of weft threads, but
There is a problem in that it is difficult to accurately detect the arrival timing.

Furthermore, if only the timing of arrival at the opposite side of weft insertion (timing of end of flight of the weft) is detected, there is a problem that it is not possible to determine whether or not the flying state during weft insertion is appropriate.

That is, if only the arrival timing of the weft (timing at which the weft finishes flying) is looked at in this way, the pressure of the supply fluid may be unnecessarily increased, which may even have a negative effect on weft insertion.

For example, when weft insertion is performed using a main nozzle and an auxiliary nozzle placed along the weft insertion path, the auxiliary nozzle on the main nozzle side becomes clogged with dust, resulting in an extremely low ejection amount, which can cause The start-up of the flying speed of the weft threads may be poor. At this time, the arrival timing of the weft is naturally delayed, so if this is the only thing you are looking at, the supply pressure of the main nozzle will be increased to compensate for this.
As a result, the traction force applied to the weft yarn by the main nozzle becomes too high, and with No. 40 single yarn, the weft yarn may break due to untwisting, and with filament yarn, filament cracking may occur.

The present invention has been made in view of these problems, and it not only eliminates the need to provide a detector outside the warp row on the anti-weft insertion side, but also detects not only the timing at which the weft flight ends but also the weft. It is an object of the present invention to provide a weft flying state detecting device capable of detecting even the flying timing during insertion, and to enable appropriate adjustment of a weft insertion device.

<Means for Solving the Problems> In order to achieve the above object, the present invention detects the passing of a weft each time a predetermined amount of the weft is pulled out in a storage section of a weft storage device as a result of weft insertion. A weft detector, a rotation angle detector that outputs a rotation angle signal of the main shaft of the loom, a display that can display multiple displays along the time axis, and a plurality of weft detectors that can be obtained by one weft insertion. means for preselecting at least one of the detection signals from the weft detector; and an indication corresponding to the rotation angle detected by the rotation angle detector when the detection signal selected by the selection means from the weft detector is generated. and a control circuit that causes the display to perform.

<Operation> In the above configuration, the behavior of the weft stored in the weft storage device and pulled out at the time of weft insertion is stable, so a stable detection signal is obtained by the weft detector, and out of this detection signal, The rotation angle of the loom main shaft at which the selected one has occurred is known based on the rotation angle signal from the rotation angle detector, and the rotation angle is displayed on the display. In this case, since it is also possible to detect the flying timing during the weft insertion, the flying state can be grasped more accurately and the weft insertion device can be adjusted.

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

First, the overall structure of the loom will be explained with reference to FIG. 1 and 1' are the frame of the loom, 2 is the warp, 3 is the cross roller, 4 is the heddle, 5 is the reed, 6 is the front of the cloth, 7
is a woven fabric, and 8 is a breast beam. In addition, 9 is a package holder fixed to frame 1, 10
A and 10B are weft yarn packages held by the package holder 9, and 11 is a weft yarn pulled out from the package 10A. The weft yarn 11 is passed through a pipe-shaped air tensor 12 inside which generates an air flow in the direction of arrow A, and then passed through a guide pulley 13.
The weft yarn is guided to a drum-type weft storage device 14, wound there, and then passed through a weft gripper 15 that grips or releases the weft yarn 11 at a predetermined timing. It is passed through the nozzle 16.

The weft storage device 14 and the weft gripper 15 will be described in more detail with reference to FIGS. 3 and 4. A gearbox 20 is fixed to stays 21A and 21B protruding from the frame 1, and a hollow rotating shaft 22 is supported on the gearbox 20. A guide pipe 23 is provided on the rotary shaft 22 so as to protrude in a direction away from the axis, and a drum 24 is supported at the tip thereof so as to be relatively rotatable. 25 is a magnet holder fixed to the gear box 20, and a magnet (not shown) fixed to the gearbox 20 is made to face a magnet 26 fixed to the back of the drum 24,
Even when the rotating shaft 22 rotates, the drum 24 remains stationary. The drum 24 is formed with a conical winding portion 24A and a substantially cylindrical storage portion 24B. The drum 24 also has a plunge hole 27 located at the boundary between the winding section 24A and the storage section 24B.
and a plunge hole 28 located in the storage portion 24B are formed, and the locking pins 29, 30 are configured to thrust into and retreat from these plunge holes 27, 28. These locking pins 29 and 30 are slidably fitted into a guide body 31 protruding from the gearbox 20, and are fitted into a rocking body 3 fitted into a rectangular portion at the end.
2 and 33, it is reciprocated in the vertical direction in FIG. Reference numerals 34 and 35 are levers for manually pulling out the locking pins 29 and 30, which are fitted onto the shaft 36. 3
7 is a gear box 20 from the loom main shaft (not shown)
It is a transmission system that transmits power to. The weft gripper 15 is fixed to a base 38 fixed to the frame 1, and a cam 40 fixed to a shaft 39 protruding from the gear box 20 swings a lever 42 pivoted to a fixed shaft 41. 42, the upper clamping body 15B is separated from the lower clamping body 15A to grip and release the weft yarn 11. 4
3 and 44 are guides provided before and after the weft gripper 15.

In this case, the guide pipe 23 rotates together with the rotating shaft 22 in relation to the main shaft of the loom, and the drum 2
While winding the weft 11 around the winding part 24A of No. 4,
The locking pins 29, 30 are moved in and out of the plunge holes 27, 28 at predetermined timing. That is, if we explain from the point in time when weft insertion is completed, first, when weft insertion is completed, the locking pin 30 has been pulled out from the plunge hole 28, the locking pin 29 has plunged into the plunge hole 27, and the weft 11 After it is locked by the locking pin 29, it takes the shortest distance to the guide 43 on the entrance side of the weft gripper 15. Next, the locking pin 30 is inserted into the plunge hole 28
After the locking pin 29 is pulled out from the plunge hole 27, the weft 1 wound around the winding portion 24A is removed.
1 is transferred to the storage portion 28B and is wound around the storage portion 24B a predetermined number of times, for example, four times, and then the locking pin 29 enters the plunge hole 27 and separates from the weft yarn 11 to be wound thereafter. When it is time to insert the weft, the weft gripper 15 releases the weft 11, the locking pin 30 pulls out from the plunge hole 28, and the weft 11 is inserted by air jet from the main nozzle 16. At this time, the weft 1 wound around the storage section 24B
1 is unwound by turning around this area 4 times, and the locking pin 2
9 and the weft insertion is completed. After this, the weft yarn gripper 15 grips the weft yarn 11.

FIG. 1 shows a system configuration of a weft flying state detection device according to the present invention when applied to such a loom.

Referring to FIG. 1, an unwinding detector 50 as a weft detector and an angle sensor 55 as a rotation angle detector are provided.

The unwinding detector 50 detects the passage of the weft yarn 11 being rewound around the drum 24 during weft insertion, and as shown in FIG. The optical fibers are bundled together, and their light emitting/receiving surfaces 51 and 52 are connected to the locking pin 3 of the storage section 24B of the drum 24, as shown in FIGS. 6 and 7.
The locking pin 2
A bracket 53 (the third
(see Figures 1 and 4). The drum 24 is made of aluminum, and the surfaces of its winding portion 24A and storage portion 24B are coated with ceramic spraying to prevent the weft 11 from slipping.
Regarding the portion of the drum 24 facing the light emitting/receiving surfaces 51 and 52, the ceramic spraying is removed to expose the aluminum surface, and the aluminum surface is bubble polished to a mirror surface 54 (see FIG. 6).

In this way, the light projected from the light projecting surface 51 is normally reflected by the mirror surface 54 of the drum 24 and enters the light receiving surface 52, and when the weft 11 is unwound, the weft 11 is transferred to the projecting/light receiving surface 52. , 52 and the mirror surface 54, the light beam is blocked and passes through the light receiving surface 5.
The amount of light incident on the weft yarn 2 is reduced, and this is used to detect the passage of the weft yarn 11. Note that the detection signal due to the passage of the weft 11 is 1 if the weft 11 is wound around the drum 24 four times for one pick.
Since it is obtained each time the weft is rewound, it can be obtained four times until the weft insertion is completed. At least one selected from these
is used for measurements.

The angle sensor 55 is a rotating body 5 that rotates in conjunction with the main shaft of the loom and has 360 protrusions around the periphery.
6, and detects the rotation angle of the main shaft of the loom by detecting the convex portion. In addition, each time a convex part is detected, 1°
It counts up in increments and outputs 0° after 359°.

These rewind detector 50 and angle sensor 5
The signal from 5 is input to a control circuit 57.

Further, a presetter 58 is provided to preset information necessary for control by the control circuit 57, and a signal from the presetter 58 is also input to the control circuit 57. This presetter 58 corresponds to selection means.

59 is a rewind timing indicator that displays the rotation angle of the loom main shaft when the weft 11 is detected by the rewind detector 50; a predetermined number of light emitting diodes 60 are arranged in a row along the angle scale; The light-emitting diodes 60 at the corresponding angles are designed to emit light in response to a signal from the angle. In this case, light emitting diodes 60 are provided every 5 degrees, and the light emitting diodes 60 at angular positions close to the actual measurement value emit light. Reference numeral 61 denotes a light emitting diode for displaying a selective rewinding signal, which is provided corresponding to the approximate angular position at each rewinding number, indicating which rewinding detection signal is selectively used for measurement.

Here, the control circuit 57 performs predetermined processing based on control inputs from the rewind detector 50, the angle sensor 55, and the presetter 58, outputs the result to the display 59, and performs a predetermined display.

Specifically, this control circuit 57 includes a CPU 62, a ROM 63, a RAM 64, an I/
O65, 66 and drivers 67, 68, a rewind detection signal from the rewind detector 50, a rotation angle signal from the angle sensor 55, a presetter 58
A preset signal (specifically, a selective rewind signal) is read into the CPU 62 via the I/O 65,
According to the program on the ROM 63, necessary data is written to and read from the RAM 64, and the I/O 66
The signal is outputted via drivers 67 and 68 to a timing display light emitting diode 60 and a selective rewind signal display light emitting diode 61.

Next, the operation of this system will be explained with reference to the flowchart shown in FIG.

First, when you turn on the power to the loom, the presetter 58
(Step 1, S1 in the figure) determines whether information is being read from the
If the conditions are to be newly set or changed, the conditions for the selective rewind signal are input from the presetter 58 (step 2). This causes the light emitting diode 61 to emit light in accordance with the selective rewind signal. That is, when all the rewind detection signals are used, all the light emitting diodes 61a to 61d are made to emit light, and when only the fourth rewind detection signal is used, only the light emitting diode 61d is made to emit light (step 3).

Next, when the operation switch of the loom is turned ON, the process proceeds to the next step based on the judgment (step 4), and when the weft yarn 11 is unwound from the drum 24 during weft insertion, the unwinding detector is detected every time the weft yarn 11 is unwound by one revolution. Wait for the input of a preselected rewind signal, for example, the fourth signal, from among the rewind detection signals from the rewind detection signal 50, and at the time it is input, read the rotation angle signal from the angle sensor 55 at that time. (Step 5,
6). and the corresponding position, e.g. 230°
The light emitting diode 60 at the position is made to emit light to make it visible (step 7).

This display is used to control the supply pressure to the main nozzle 16. In other words, if the operator sees this display and the fourth unwinding angle is smaller than the standard angle, the pressure is too high, so adjust the regulator to reduce the pressure to near the standard angle. , if the angle is larger than the standard angle, the pressure is too low, so increase the pressure.

In addition, if you display all or the first to third unwinding angles during weft insertion, you can measure the dispersion in the unwinding interval of weft threads during weft insertion, so you can adjust the unwinding angle so that the interval is constant. Change the supply pressure to the auxiliary nozzle during weft insertion or adjust the injection timing.

Specifically, if the interval between certain timings is larger or smaller than the normal interval,
Since it is known that there is an abnormality in the auxiliary nozzle in the corresponding section, if the interval is large, the auxiliary nozzle in the corresponding section should be investigated for clogging and recovery. If it is small, reduce the supply pressure to the auxiliary nozzle in this section.

In addition, in the above embodiment, in the case of a drum-type weft storage device, the weft yarn detector that detects the passage of the weft yarn every time the weft yarn is pulled out by a predetermined amount in the storage section of the weft storage device is used to unwind the drum 24 in the case of a drum type weft storage device. However, in the case of a pool pipe-type weft storage device that stores the weft by carrying it in the air flow, a plurality of unwinding detectors 50 are used in the pool pipe 81 as shown in FIG. The detectors 82 may be arranged side by side.

<Effects of the Invention> As explained above, according to the present invention, since the method does not detect the arrival of the tip of the weft yarn on the opposite weft insertion side, a stable detection signal can be obtained and the waste yarn can be lengthened. Of course, it is possible to detect not only the timing at which weft insertion ends, but also the timing during weft insertion, so by displaying these, you can more accurately grasp the weft flight status, and improve the performance of the weft insertion device. The effect is that adjustments can be made more accurately. In addition, since multiple angles can be displayed during one weft insertion, it is possible to see variations in the state of weft withdrawal from the storage device during weft insertion, and for example, the weft insertion device can be adjusted to eliminate such variations. be.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of the main parts showing an embodiment of the present invention, Fig. 2 is a plan view of the loom, Fig. 3 is a plan view of the weft storage device, Fig. 4 is a side view of the weft storage device, and Fig. 4 is a side view of the weft storage device. 5 is an enlarged view of the rewind detector, FIGS. 6 and 7 are front and side views showing the layout of the rewind detector, FIG. 8 is a block diagram showing the hardware configuration of the control circuit, and FIG. 9 is a block diagram showing the hardware configuration of the control circuit. The figure is a flowchart showing the control contents, and FIG. 10 is a schematic diagram showing another embodiment of the detector. 11... Weft, 14... Weft storage device, 16...
... Main nozzle, 24 ... Drum, 29, 30 ... Locking pin, 50 ... Rewinding detector, 55 ... Angle sensor, 57 ... Control circuit, 59 ... Display.

Claims (1)

[Claims] 1. In a fluid jet loom that inserts the weft yarn 11 stored in the weft storage device 14 into the warp opening while drawing it out by fluid jet from the weft insertion nozzle 16, the weft yarn is placed in the storage section of the weft storage device 14 as the weft is inserted. Weft detectors 50 and 82 that detect the passage of the weft 11 each time it is pulled out in a fixed amount, a rotation angle detector 55 that outputs a rotation angle signal of the main shaft of the loom, and a display that can display multiple displays along the time axis. 59, means 58 for preselecting at least one of the detection signals from the weft detectors 50, 82 obtained in one weft insertion, and the selection means 58 from the weft detectors 50, 82. A control circuit 57 for causing the display 59 to display a display corresponding to the rotation angle detected by the rotation angle detector 55 when a detection signal selected by the rotation angle detector 55 is generated. Running condition detection device.