JPH0417587Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to a control device for a fluid jet loom.
In particular, the present invention relates to a device for controlling optimal weft insertion conditions.

<Prior art> As a conventional control device of this type, for example,
There is one shown in the -96938 publication. this is,
The weft is inserted into the warp opening using a plurality of nozzles supplied with a transfer fluid, and the weft transfer speed is determined based on the timing when the weft tip reaches the opposite side of the weft insertion, starting from the start of weft insertion. This method measures the time and controls the rotation speed or transfer speed of the main shaft of the loom so that the measured time occupies a constant portion of one cycle of the loom, and is effective in reducing weft insertion errors.

<Problems to be solved by the invention> By the way, in order to improve the quality of textiles, it is necessary to equalize the warp tension and the weft tension.The warp tension is determined by improving the performance of warp delivery, but the weft tension is This is largely due to the improved performance of weft insertion.

One method for improving the performance of this weft insertion is the device disclosed in the above publication, but this attempts to make the timing of the arrival of the weft yarn to the side opposite to the weft insertion constant, and does not directly control the tension of the weft yarn. I haven't seen it.

Therefore, when the weft package changes, the weft tension differs for each package, so if the arrival timing is made constant, the weft tension will change, making it impossible to obtain a high-quality fabric.

Therefore, in Japanese Patent Application No. 59-149663, the present applicant proposed a weft tension detector for detecting the tension at the end of flight of the weft in a fluid jet loom that inserts the weft through a weft insertion nozzle, and a weft tension detector for detecting the tension at the end of the flight of the weft. A control device for a fluid injection type loom, comprising a control means for comparing the tension at the end of the flight with a reference tension and controlling the fluid supplied to the weft inserting nozzle or the rotation speed of the loom main shaft according to the difference. Proposed.

However, the above-mentioned weft tension detector detects the tension when the weft is stopped by the locking pin of the drum-type weft storage device at the end of flight from the amount of deflection of the locking pin. Not only is the tension of the weft that is directly locked on the pin acting on the pin, but also lateral force is applied from the weft that has been wound around the storage drum several times, so the winding of the weft on the storage drum is affected. Regardless of the quantity, it is difficult to detect the tension of the inserted weft yarn, which is related to the weft insertion force, and there is still room for improvement.

In view of these circumstances, the present invention has developed a fluid jet system that accurately and reliably detects the tension at the end of the weft flight, which is related to the weft insertion force, and keeps this tension constant to produce high-quality fabrics. The purpose of the present invention is to provide a control device for a type loom.

<Means for Solving the Problems> In order to achieve the above-mentioned purpose, the present invention has a storage drum for winding and storing the weft, a ring-shaped guide arranged on the extension of the axis of this drum, and a jet fluid. A fluid injection type loom including a weft insertion nozzle for loading the weft and inserting the weft, and guiding the weft pulled out from the storage drum to the ring-shaped guide and then passing it through the weft insertion nozzle. A supporting elastic body, a weft tension detector that detects the tension of the weft applied to the guide when the weft finishes flying, and a weft tension detector that compares the tension from the weft tension detector with a reference tension and adjusts the weft according to the difference. A control device for a fluid injection type loom is configured by providing a control means for controlling the fluid supplied to the input nozzle or the rotation speed of the main shaft of the loom.

<Function> In other words, when the tension of the weft yarn increases at the end of its flight, the elastically supported guide tries to displace in a direction that alleviates the increase in tension. , to accurately and reliably detect the tension at that time.

Based on the tension at the end of the weft flight, if the tension is lower than the standard tension, the pressure or flow rate of the fluid supplied to the weft insertion nozzle is increased, or the rotational speed of the loom main shaft is decreased ( (Reducing the rotational speed increases the time the fluid acts on the weft yarn) and increases the tension.In this way, the tension at the end of the weft flight is controlled to be constant, and the tension is controlled to be constant without fear of yarn breakage. Obtain high-quality textiles.

<Example> An embodiment 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 yarn is guided to a drum-type weft storage device 14, wound there, and then passed through a guide 15 and then through a main weft insertion nozzle 16 that swings together with the reed 5.

The weft storage device 14 will be explained 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 in the gearbox 20. It has been done. A guide pipe 23 is provided on the rotating shaft 22 and protrudes in a direction away from the axis.
Further, a drum 24 is supported at the tip portion so as to be relatively rotatable. Reference numeral 25 denotes a magnet holder fixed to the gearbox 20, and a magnet (not shown) fixed thereto is opposed to a magnet 26 fixed to the back surface of the drum 24, so that even when the rotating shaft 22 rotates, the drum 2 does not move.
4 remains stationary. drum 24
A conical winding portion 24A and a substantially cylindrical storage portion 24B are formed in the holder. The drum 24 is also formed with a plunge hole 27 located at the boundary between the winding part 24A and the storage part 24B, and a plunge hole 28 located in the storage part 24B.
The locking pins 29 and 30 are designed to move in and out of the holes 7 and 28. These locking pins 2
9 and 30 are guide bodies 3 protruding from the gearbox 20.
1, and is reciprocated in the vertical direction in FIG. 3 by rocking bodies 32 and 33 fitted in rectangular portions at the ends. 34, 35 are locking pins 29,
30, and is fitted onto a shaft 36. 37 is a transmission system that transmits power from the loom main shaft (not shown) to the gearbox 20.

The guides 15 are arranged on an extension of the axis of the drum 24, and as shown in FIG. It is elastically supported from three directions by three tension springs 39A to 39C. These springs 39A-39
The other end of C is locked to locking pieces 41A to 41C attached to a support 40 fixed to the frame 1.
A large insertion hole 42 is formed in the support body 40 in a portion facing the plate 38, so that the weft yarn 11 does not come into sliding contact with this hole. Here, drum 2
Weft yarn 1 locked on locking pin 29 or 30 on 4
1 is inserted into the guide 15 through the insertion hole 42 of the support 40, then into the guide 43 (see FIG. 3) separately fixed to the support 40, and then inserted into the main nozzle 1.
6 has been passed.

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 of 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 lock pin 29 has plunged into the plunge hole 27, and the weft 11 is After being locked by the locking pin 29, it takes the shortest distance to the guide 15. Next, after the locking pin 30 enters the plunge hole 28, the locking pin 2
9 is pulled out from the plunge hole 27, and the weft 11 that had been wrapped around the winding section 24A is moved to the storage section 24B.
After being wound around the storage portion 24B a predetermined number of times, for example, four times, the locking pin 29 enters the plunge hole 27 and separates from the weft yarn 11 that will be wound thereafter. When it is time to insert the weft, the locking pin 30 is pulled out from the plunge hole 28, and the weft 11 is inserted by air jet from the main nozzle 16. At this time, the storage section 24
The weft yarn 11 that has been wound around B is wound around this area four times and unwound, and is locked by the locking pin 29 to complete the weft insertion.

Here, the weft tension detector 53 detects the tension when the weft 11 is stopped by the locking pin 29 at the end of the flight of the weft 11, and as shown in FIG. A strain gauge is used which is fixed to the plate 38 and connected to the portion of the plate 38 with the guide 15 on the side substantially opposite to the locking pin 29 by a wire 54. Therefore, this strain gauge must be located at a position where it can detect the displacement of the guide 15 when the weft 11 is locked to the locking pin 29.

According to this, when the weft 11 finishes flying, the weft 1
1 is locked by the locking pin 29 and the tension of the weft 11 increases, the springs 39A to 39A are attached to the support body 40.
Guide 1 elastically supported via 39C
5 attempts to relieve the tension by moving in the direction of arrow B in FIG.

Next, a weft insertion control device constructed using the above-mentioned weft tension detector 53 will be explained.

Figure 5 shows an overview of the weft insertion control device.
The main nozzle 16 is connected from a pressure air supply source to an electro-pneumatic proportional valve 45 that has the function of adjusting the air pressure to an air pressure proportional to an electrical signal, and an air tank 4 for pressure stabilization.
6. A solenoid valve 47 that opens when the loom start preparation switch is turned on and closes when the loom stops;
Pressurized air is supplied by a cam 48 that rotates in conjunction with the main shaft of the loom through a mechanical valve 49 that opens at a predetermined time of the weaving cycle, that is, at the weft insertion time. 50 is a pressure gauge. Here, a digital signal from the control circuit 51 is converted into an analog voltage and input to the electro-pneumatic proportional valve 45 via the D/A converter 52 .

The control circuit 51 includes, as control inputs, a signal from the weft tension detector 53 as well as an angle sensor 55.
and a signal from the presetter 57 are input. Although not shown, a signal from a proximity switch that emits a signal every rotation of the loom main shaft is also input.

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 the rotation angle of the main shaft (hereinafter referred to as main shaft angle) is detected by detecting the convex portion. In addition, each time a convex part is detected, the count is increased by 1°, and the count increases to 359°.
The next value is set to output 0°.

The presetter 57 is provided to preset information necessary for control in the control circuit 51.
Binary switches 57a and 3 capable of hexadecimal input
A decimal switch 57b and the like are provided.

58 is a timing indicator that displays the main shaft angle when the tension at the end of flight of the weft yarn 11 is detected by the weft tension detector 53; a predetermined number of light emitting diodes 59 are arranged in a row along the angle scale; In response to a signal from the circuit 51, a light emitting diode 59 at a corresponding angle emits light. In this case, light emitting diodes 59 are provided every 5 degrees, and the light emitting diodes 59 at angular positions close to the actual measurement values emit light. The display 58 also shows the supply pressure to the main nozzle 16, that is, the electric-pneumatic proportional valve 4.
Digital display section 6 that displays the digital output to 5
0 is set.

Here, the control circuit 51 performs predetermined processing based on control inputs from the weft tension detector 53, angle sensor 55, and presetter, and performs D/A
It outputs to the converter 52 and the display 58, and the electricity
The supply pressure to the main nozzle 16 is controlled via the pneumatic proportional valve 45 and a predetermined display is performed.

Specifically, this control circuit 51 includes a CPU 61, a ROM 62, a RAM 63, an I/
O64, 65 and drivers 66, 67, weft tension signal from weft tension detector 53, spindle angle signal from angle sensor 55, presetter 57
Reference tension setting value T ₀ from, Tolerance range setting value LM,
The pressure upper limit setting value Va, the pressure lower limit setting value Vb, and the initial pressure setting value V are sent to the CPU 61 via the I/O 64.
according to the program on the ROM 62, write the necessary data to the RAM 63, read it again,
It is outputted to the D/A converter 52 via the I/O 65, and also outputted to the light emitting diode 59 for timing display and the digital display section 60 for pressure display via drivers 66 and 67.

Next, the operation of this weft insertion control device will be explained with reference to the flowcharts of FIGS. 7 and 8.

First, when the power to the loom is turned on, the start pick number SP and the cumulative values ΣT and ΣP, which will be described later, are cleared.
Then, the voltage value corresponding to the output from the D/A converter 52 that has been set up to that point is sent to the driver 6.
7 on the digital display section 60 for pressure display (step 1 of the flow in FIG. 7, S in the figure).
1). Here, the voltage value is set to match the pressure value.

Next, it is determined whether or not information is being read from the presetter 57 (reading switch is ON) (step 2), and when various conditions are to be newly set or changed in the reading state, as shown in FIG. These conditions are inputted from the presetter 57 according to the flow shown in FIG. That is, for example, the presetter 57
If the binary switch 57a is 0, the process immediately returns to the flow shown in FIG. 7 and it is determined whether the operation switch is ON or not (step 3), but if the binary switch 57a is 1, the standard tension of the weft is
This is the case when setting T _0. In this case, after displaying the current setting value, it is determined whether or not to write a new value (write switch ON). The thus set value is written to the RAM 63 and stored. That is, when setting the reference tension T ₀ , it is sufficient to set the binary switch 57a to 1, set the decimal switch 57b to "500" representing 50 g, and turn on the write switch.

To set the allowable range LM, set the binary switch 57a to A, set the decimal switch 57b to 10, for example, and turn on the write switch. Also, the upper limit of pressure
When setting Va, use binary switch 57
It is sufficient to set a to B, set the value using the decimal switch 57b, and turn on the write switch. Further, when setting the lower limit value Vb of the pressure, it is sufficient to set the binary switch 57a to C and perform the same operation. Further, when setting the initial pressure V, it is sufficient to set the binary switch 57a to F, set the value using the decimal switch 57b, and turn on the write switch.

Next, when the operation switch of the loom is turned on, the number of picks SP from the sit point is determined (step 4).
Up to the second pick, the presence or absence of a signal from the proximity switch is determined (step 5), and when there is a signal, the start pick number SP is counted up (step 6), and the process waits for the third pick. In this way, until the second pick, pressure control and reading of information for this purpose are not performed, and the rotation is waited for to become stable.
Note that, at this time, injection is performed at the initial pressure V.

From the third pick onwards, the weft tension T when the weft 11 is locked by the locking pin 29 at the end of its flight is read by the signal from the weft tension detector 53, and then the reference tension T ₀ is determined. The difference (T- _T0 ) is determined by subtraction, and the cumulative value ΣT of the difference is calculated. At the same time, the value of ΣP indicating the number of picks since the start of accumulation is incremented by 1 (step 7).

Next, it is determined whether the cumulative value ΣT of the difference (T-T ₀ ) exceeds the allowable range LM (for example, ±10) on the plus or minus side (steps 8 and 9).

If the positive tolerance is exceeded, divide the current pressure (or the initially set initial pressure) V by the number of picks ΣP (for example, 10) until the tolerance is exceeded, and subtract this from the current pressure V. Then, a new pressure V is set (step 10). Next, the set pressure V is compared with the lower limit value Vb (step 11), and if it is smaller than the lower limit value Vb, it is set to the lower limit value Vb (step 12).

If the negative tolerance is exceeded, divide the current pressure V by the number of picks until the tolerance is exceeded, add this to the current pressure V, and set a new pressure V (Step 13). . Next, the set pressure V is compared with the upper limit value Va (step 14), and if it is larger than the upper limit value Va, it is set to the upper limit value Va (step 15).

The newly set pressure V in this way is D/
It is output to the A converter 52 and displayed on the digital display section 60. At the same time, ΣT and ΣP are cleared (step 16).

If the cumulative value of the difference between the detected weft tension value and the reference value exceeds the positive tolerance range, the weft tension is too large, and the main nozzle is Supply pressure V to 16
The weft tension is kept constant by lowering the traction force and reducing the tension at the end of the weft flight.

On the other hand, if it exceeds the allowable range on the negative side, the weft tension is too small, so the supply pressure V to the main nozzle 16 is increased according to the number of picks required to exceed it.
is increased, the traction force is increased, the tension at the end of the weft flight is increased, and the weft tension is kept constant.

If it is within the permissible range, the previous pressure can of course be continued. Also, the driving switch
If it becomes OFF, clear the start pick number SP (switch 17) and wait.

Here, when the weft yarn package 10A goes from a full winding state to an empty winding state, the pressure V gradually tends to decrease in relation to the pull-out resistance of the weft yarn 11, and becomes smaller than the lower limit value Vb before reaching an empty winding state. In this case, the pressure V remains held at the lower limit value Vb as described above. This is because even if the weft package 10B is switched to the weft package 10B and becomes fully wound, the pressure at the time of the empty winding state is maintained until the cumulative value exceeds the allowable range. This is because if the pressure V is lowered too much at this time, the pressure V will be too low when the state is switched to the full winding state, resulting in a weft insertion failure. Therefore, this lower limit value Vb
must be set to a value within which weft insertion errors will not occur and weave defects will not occur. The upper limit value Va needs to be set within a range where yarn breakage and air loss do not occur.

Further, when a weft tension signal is generated from the weft tension detector 53, the main shaft angle signal at that time is read, and the light emitting diode 59 corresponding to the angle is caused to emit light, thereby visualizing the timing.

In this example, the supply pressure to the main nozzle was controlled, but in the case of an air injection loom,
The supply pressure to the auxiliary nozzle may also be controlled. In addition, by controlling the rotation speed of the loom main shaft, increasing the rotation speed to shorten the weft insertion time (fluid action time) and reducing tension, or decreasing the rotation speed to lengthen the weft insertion time. The weft tension may be made uniform by increasing the tension.

<Effect of the invention> As explained above, according to the invention, the tension at the end of the weft flight is detected and the tension is controlled to be constant, so even if the weft tension changes due to the weft package, , high-quality fabrics can be obtained without being affected by this. In addition, since the tension is kept constant, even if you want to increase the speed of the loom, by setting the reference value to the value that will not cause stopback (flaws due to filament breakage), you can increase the speed to the maximum without causing yarn breakage. ,
In addition, even when trying to save energy, if the reference value is set to the value that is as close as possible to avoid kinky weft insertion, the maximum energy saving can be achieved without causing weft insertion errors.

Further, according to the present invention, the weft yarn pulled out from the storage drum is guided to a ring-shaped guide supported by an elastic body, and then guided to the weft insertion nozzle, and the weft yarn is Since the tension at the end of the weft flight is detected, the tension at the end of the weft flight can be detected accurately and reliably without increasing the pull-out resistance of the weft yarn.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, in which Fig. 1 is a perspective view of the weft tension detector, Fig. 2 is a plan view of the loom, Fig. 3 is a plan view of the weft storage device, and Fig. 4 is a weft yarn tension detector. FIG. 5 is a schematic diagram of the weft insertion control device, FIG. 6 is a block diagram showing the hardware configuration of the control circuit, and FIGS. 7 and 8 are flowcharts showing the control contents. 11... Weft, 14... Weft storage device, 15...
...Guide, 16...Main nozzle, 24...Drum,
29, 30... Locking pin, 38... Plate, 3
9A to 39C...Spring, 40...Support,
45...Electro-pneumatic proportional valve, 51...Control circuit, 53...Weft tension detector, 54...Wire.

Claims (1)

[Scope of utility model registration request] It includes a storage drum 24 for winding and storing the weft, a ring-shaped guide 15 disposed on the extension of the axis of this drum, and a weft insertion nozzle 16 for inserting the weft while being carried by jetting fluid, and for collecting the weft drawn from the storage drum. In the fluid injection type loom, the elastic body 39A elastically supports the guide.
~39C, and a weft tension detector 53 that detects the tension of the weft applied to the guide when the weft finishes flying.
and control means 45, 51 for comparing the tension from the weft tension detector with a reference tension and controlling the fluid supplied to the weft insertion nozzle or the rotational speed of the loom main shaft according to the difference. Control device for jet loom.