JPH0639734B2 - Fluid ejection loom controller - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a control device for a fluid jet loom, and particularly to a control for controlling the supply fluid of a weft insertion nozzle or the rotational speed of a loom main shaft under optimal weft insertion conditions. Regarding the device.

<Prior Art> Conventionally, as a control device of this type, for example, JP-A-56-96
There is one disclosed in Japanese Patent No. 938. This is to insert the weft into the warp opening using a plurality of nozzles that are supplied with the transfer fluid, and know the timing when the tip of the weft reaches the opposite weft inserting side with the start of the weft insertion as the base point. The weft transfer speed or time is measured, and the rotational speed or transfer speed of the loom main shaft is controlled so that the time occupies a certain portion in one cycle of the loom, and it is effective for reducing weft insertion errors. .

<Problems to be solved by the invention> By the way, in order to improve the quality of the woven fabric, it is required to make the warp tension and the weft tension uniform. Is largely due to the high performance of weft insertion.

One of the methods for improving the performance of this weft insertion is the device of the above-mentioned publication, but this is to make the timing of arrival of the weft on the side opposite to the weft insertion constant, and to directly adjust the tension of the weft. I haven't seen it.

Therefore, when the weft package changes, the weft tension varies from package to package. Therefore, if the arrival timing is constant, the weft tension changes, and a high-quality fabric cannot be obtained.

Therefore, it is an object of the present invention to provide a controller for a fluid jet loom that can obtain a high-quality woven fabric with a constant weft tension.

<Means for Solving Problems> In order to achieve the above-mentioned object, the present invention inserts the weft thread wound around a drum by a weft insertion nozzle, and locks the weft thread on a locking pin protruding into the drum. In the fluid jet loom that regulates the weft length for one weft insertion by doing so, a weft tension detector for detecting the tension of the weft when the weft is locked by the locking pin at the end of the flight, and a weft tension detector Control means is provided for comparing the tension at the end of flight and the reference tension, and controlling the fluid supplied to the weft insertion nozzle or the rotational speed of the loom main spindle in accordance with the difference.

<Action> In this way, the tension at the end of the weft flight is detected, and if it is lower than the reference tension, for example, the pressure or flow rate of the fluid supplied to the weft insertion nozzle is increased, or the rotational speed of the loom spindle is decreased. The tension is increased by decreasing the rotation speed to increase the fluid action time on the weft thread. In this way, the weft thread tension is controlled to be constant, and there is no fear of thread breakage and high quality. You get a woven fabric.

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

First, the overall structure of the loom will be described with reference to FIG. 1,
1'is a frame of a loom, 2 is a warp, 3 is a back roller,
4 is a heddle, 5 is a reed, 6 is a cloth cloth, 7 is a woven cloth, and 8 is a pressed beam. Further, 9 is a package holder fixed to the frame 1, 10A and 10B are weft packages held by the package holder 9, and 11 is a weft drawn from the package 10A. The weft yarn 11 is passed through a pipe-shaped air tenser 12 in which an air flow in the direction of arrow A is generated, and then a weft yarn storage device for drum type via a guide pulley 13.
It is led to 14, wound around it, and passed through a weft grasper 15 that grasps or releases the weft 11 at a predetermined timing, and a main nozzle 16 for weft insertion that swings integrally with the reed 5. .

The weft storage device 14 and the weft gripper 15 will be described in more detail with reference to FIGS. 3 and 4. Gearbox 20
Is fixed to stays 21A and 21B protruding from the frame 1, and a hollow rotating shaft 22 is supported by the gear box 20 thereof. A guide pipe 23 is provided on the rotary shaft 22 in a direction away from the axis of the rotary shaft 22, and a drum 24 is rotatably supported at the tip of the rotary pipe 22. Reference numeral 25 denotes a magnet holder fixed to the gear box 20, and a magnet (not shown) fixed to the magnet holder and a magnet 26 fixed to the back surface of the drum 24 are opposed to each other so that the drum 24 can be rotated even if the rotary shaft 22 rotates. I keep it still. The drum 24 has a conical winding portion 24A and a substantially cylindrical storage portion 24B. The drum 24 is also formed with a plunge hole 27 located at the boundary between the winding portion 24A and the storage portion 24B, and a plunge hole 28 located at the storage portion 24B. Against the locking pins 29, 30
Are rushing in and out. These locking pins
29 and 30 are slidably fitted to a guide body 31 protruding from the gear box 20, and a rocking body 32 fitted to a rectangular portion at the end.
It is reciprocated vertically by 33 in FIG. 34 and 35 are levers for manually pulling out the locking pins 29 and 30, which are fitted to the shaft 36. A transmission system 37 transmits power from the main shaft of the loom (not shown) to the gear box 20. The weft gripper 15 is fixed to a base 38 fixed to the frame 1, and a lever 42 pivotally mounted on a fixed shaft 41 is swung by a cam 40 fixed to a shaft 39 protruding from the gear box 20. The upper clamp 15B is moved toward and away from the lower clamp 15A by
11 gripping and releasing are performed. 43 and 44 are guides provided in front of and behind the weft gripper 15.

In this structure, the guide pipe 23 is rotated together with the rotary shaft 22 in relation to the main shaft of the loom to wind the weft 11 around the winding portion 24A of the drum 24, and the locking pins 29 and 30 are inserted into the projecting holes. 27, 28
It is put in and out at a predetermined timing. That is, when the weft insertion is completed, the locking pin 30 is pulled out from the plunge hole 28 at the end of the weft insertion, and the locking pin 29 is plunged into the plunge hole 27. After being locked by the locking pin 29, the shortest distance is taken to the guide 43 on the inlet side of the weft gripper 15. Next, after the locking pin 30 is inserted into the insertion hole 28, the locking pin 29 is pulled out from the insertion hole 27, and the winding portion
The weft 11 wound around 24A is moved to the storage portion 24B and wound around the storage portion 24B a predetermined number of times, for example, four times, and then the locking pin 29 projects into the insertion hole 27, and the weft is wound thereafter.
Separate from 11. When the weft insertion time comes, the weft gripper
15 releases the weft yarn 11, the locking pin 30 is pulled out from the thrust hole 28, and the weft yarn 11 is weft-inserted by the air injection from the main nozzle 16. At this time, the weft 11 wound around the storage portion 24B is rewound four times around this and is rewound, locked by the locking pin 29, and the weft insertion is completed. After that, the weft grasper 15 grasps the weft 11.

An outline of the control system according to the present invention when applied to such a loom is shown in FIG.

Referring to FIG. 1, to the main nozzle 16, an electric-pneumatic proportional valve 45 having a function of adjusting an air pressure proportional to an electric signal from a pressure air supply source, stores an air amount corresponding to approximately one pick. An air tank 46, a solenoid valve 47 which is opened by turning on the start preparation switch of the loom and closed when the loom is stopped, and a cam 48 which rotates in conjunction with the main shaft of the loom open at a predetermined time of the weaving cycle, that is, a weft insertion time. Pressure air is supplied through the mechanical valve 49. 50 is a pressure gauge. Here, the electric-pneumatic proportional valve 45 receives the digital signal from the control circuit 51 as D / A.
It is converted into an analog voltage via the converter 52 and input.

A signal from the weft tension detector 53, a signal from the angle sensor 55, and a signal from the presetter 57 are input to the control circuit 51 as control inputs. Further, although not shown, a signal from a proximity switch that outputs a signal for each rotation of the main shaft of the loom is also input.

The weft tension detector 53 detects the tension of the weft 11 at the end of flight and uses a strain gauge attached to the side wall of the locking pin 29. 54 is the lead wire from it. Therefore, this strain gauge must be in a position where the deflection when the weft thread 11 is locked by the locking pin 29 can be detected. It should be noted that instead of the strain gauge, a piezoelectric type that directly detects the impact of the weft thread 11 contacting may be used.

The angle sensor 55 rotates in conjunction with the main shaft of the loom and is made to face the rotating body 56 having 360 convex portions around it, and detects the convex portion to detect the rotation angle of the main spindle (hereinafter referred to as the main spindle angle). To do. Each time a convex portion is detected, it is incremented by 1 °, and 0 ° is output after 359 °.

The presetter 57 is provided to preset information required for control by the control circuit 51, and includes a binary switch 57a capable of hexadecimal input, three decimal switches 57b, and the like.

Reference numeral 58 is a timing indicator that displays the spindle angle when the tension at the end of flight of the weft 11 is detected by the weft tension detector 53, and a predetermined number of light-emitting diodes 59 are arranged in line along the angle scale for control. The signal from the circuit 51 causes the light emitting diode 59 of the corresponding angle to emit light. In this case, the light emitting diode 59 is provided for every 5 ° so that the light emitting diode 59 at an angular position close to the actually measured value emits light. Further, the display 58 is provided with a digital display section 60 for displaying the supply pressure to the main nozzle 16, that is, the digital output to the electric-pneumatic proportional valve 45.

Here, the control circuit 51, based on the control input from the weft tension detector 53, the angle sensor 55 and the presetter 57,
A predetermined process is performed and output to the D / A converter 52 and the display 58 to control the supply pressure to the main nozzle 16 via the electric-pneumatic proportional valve 45 and a predetermined display.

Concretely, this control circuit 51, as shown in FIG.
U61, ROM62, RAM63, I / O64, 65 and driver
66, 67, weft tension signal from the weft tension detector 53,
The main shaft angle signal from the angle sensor 55, the reference tension set value T ₀ from the presetter 57, the allowable range set value LM, the pressure upper limit set value Va, the pressure lower limit set value Vb, and the initial pressure set value V are passed through 1 / O64. Read to CPU61, write necessary data to RAM63 according to the program on ROM62,
It also reads and outputs to the D / A converter 52 via the I / O 65, and to the timing display light emitting diode 59 and the pressure display digital display unit 60 via the drivers 66 and 67.

In this embodiment, the electro-pneumatic proportional valve 45 and the control circuit 51 are used.
The above constitutes a control means for controlling the fluid supplied to the main nozzle 16.

Next, the operation of this system will be described with reference to the flowcharts of FIGS. 6 and 7.

First, when the power of the loom is turned on, the star topic number SP and the cumulative values ΣT and ΣP described later are cleared, and the voltage value corresponding to the output from the D / A converter 52 set up to that time is set in the driver 67. It is displayed on the digital display unit 60 for displaying the pressure through (step S in the flow of FIG. 6).
1). Here, it is set to match the voltage value.

Next, it is determined whether or not information is being read from the presetter 57 (reading switch ON) (step S2), and in the reading state, when various conditions are newly set or changed, FIG. The conditions are input from the presetter 57 according to the flow of. That is, for example, when the binary switch 57a of the presetter 57 is 0, the sixth
Returning to the flow of the figure, it is judged whether the operation switch is ON (step S3), but the binary switch 57a
Is 1 when the reference tension T _{0 of the} weft thread is set. At this time, after displaying the current set value, it is determined whether or not a new value is to be written (writing switch ON), and the value is to be written. If so, the value set by the three decimal switches 57b is written in the RAM 63 and stored therein. That is, when setting the reference tension T ₀ , the binary switch 57
It is sufficient to set a to 1, set it to 50 g by the decimal switch 57b, and turn on the write switch.

To set the allowable range LM, set the binary switch 57a to A and set the decimal switch 57b to, for example,
Set it to 10, and turn on the write switch. When the upper limit value Va of the pressure is set, the binary switch 57a is set to B, the value is set by the decimal switch 57b, and the write switch is turned on. When the lower limit value Vb of the pressure is set, the binary switch 57a may be set to C and the same operation may be performed.
When the initial pressure V is set, the binary switch 57a is set to F, the value is set by the decimal switch 57b, and the write switch is turned on.

Next, when the operation switch of the loom is turned on, the pick number SP from the start is determined (step S4). Up to the second pick, the presence / absence of a signal from the proximity switch is determined (step S5), and when there is a signal, the star topic number SP is counted up (step S6) and the third pick is waited. In this way, pressure control and reading of information for that are not performed until the second pick, and wait until the rotation is stabilized.

After the third pick, the weft thread tension T when the weft thread 11 is locked to the locking pin 29 at the end of the flight of the weft thread 11 is read by a signal from the weft thread detector 53, and the reference tension T ₀ is subtracted from it. , The difference (T−T ₀ ), and the cumulative value ΣT of the difference
To calculate. At the same time, the value of ΣP indicating the number of picks since the accumulation is started is increased by 1 (step S7).

Next, it is determined whether the cumulative value ΣT of the difference (T−T ₀ ) exceeds the plus side or minus side allowable range LM (for example, ± 10) (steps S8 and 9).

If the allowable range on the plus side is exceeded, the current pressure (or the initially set initial pressure) V is divided by the number of picks ΣP (eg 10) until the allowable range is exceeded, and this is subtracted from the current pressure V. And set a new pressure V (S step 1
0). Next, the set pressure V is compared with the lower limit value Vb (step S11), and when it is smaller than the lower limit value Vb, the lower limit value Vb is set (step S12).

If the allowable range on the minus side is exceeded, the current pressure V is divided by the number of picks until the allowable range is exceeded, this is added to the current pressure V, and a new pressure V is set (step S13). . Next, the set pressure V is compared with the upper limit value Va (step S14), and when it is larger than the upper limit value Va, it is set to the upper limit value Va (step S15).

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

If the accumulated value of the difference between the weft tension detection value and the reference value exceeds the allowable range on the plus side, the weft tension is too high. The supply pressure V to the 16 is reduced, the traction force is weakened, the tension at the end of the weft flight is reduced, and the weft tension is kept constant.

On the contrary, if the allowable range on the negative side is exceeded, the weft thread tension is too small, so the supply pressure V to the main nozzle 16 is increased and the traction force is increased by an amount corresponding to the number of picks required to exceed it. The tension at the end of the weft flight is increased to keep the weft tension constant.

Of course, if it is within the allowable range, the previous pressure is continued. When the operation switch is turned off, the star topic number SP is cleared (step S17) and the process stands by.

Here, when the weft yarn package 10A goes from the full-wound state to the empty-wound state, the pressure V gradually decreases in relation to the pull-out resistance of the weft yarn 11, and becomes smaller than the lower limit value Vb before the empty-wound state. However, in this case, the pressure V remains held at the lower limit value Vb as described above. This is because even if the weft yarn package 10B is switched to the full winding state, the pressure in the idle winding state is maintained until the accumulated value exceeds the allowable range. When the pressure V
This is because if V is lowered too much, the pressure V will be too low and the weft insertion failure will occur when the state is switched to the full winding state. Therefore, it is necessary to set the lower limit value Vb to a value that does not cause weft insertion error and does not cause weaving defects. It is necessary to set the upper limit value Va within a range that does not cause yarn breakage or air loss.

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

FIG. 8 shows another embodiment of the weft tension detector. Two fixed rollers 73, 74 and a movable roller 75 positioned between them are provided in the weft path between the guides 71, 72 between the weft storage device 14 and the main nozzle 16 to slightly move the weft 11. It's bent. Here, the movable roller 75 is attached to a support 76 that is inclined with respect to the weft path, and a strain gauge 77 as a weft tension detector is attached to this support 76. The processing of the signal from the strain gauge 77 is the same as that of the above-mentioned embodiment.

In the case of such a configuration, when the weft thread is locked by the locking pin 29 at the end of weft insertion, the tension of the weft thread 11 rises sharply, so that the support body 76 is flexed via the roller 75. The deflection of the support 11 is detected by the strain gauge 77.

However, in the case of this example, since the weft 11 is constantly bent by the movable roller 75, the traveling resistance of the weft 11 becomes large, so that the weft 11 is more suitable for the water jet loom than the air jet loom.

In this embodiment, the supply pressure to the main nozzle is controlled, but in the case of the air jet loom, the supply pressure to the auxiliary nozzle may be controlled. In addition, by controlling the rotation speed of the loom spindle, increasing the rotation speed to shorten the weft insertion time (fluid working time) and decreasing the tension, or decreasing the rotation speed to lengthen the weft insertion time to increase the tension. The weft tension may be made uniform by increasing the tension.

<Effects of the Invention> As described above, according to the present invention, since the tension of the weft when locked by the locking pin at the end of flight is detected and the tension is controlled to be constant, the weft is controlled. Even if the weft tension changes depending on the package, a high-quality woven fabric can be obtained without being affected by this. In addition, since the tension is kept constant, even when trying to increase the speed of the loom, if the reference value is set to a value just below the strip back (defects due to filament breakage), the speed will be maximized without causing thread breakage. Even if energy saving is intended, the energy saving can be maximized without causing weft insertion error by setting the reference value as close as possible without the kinky.

[Brief description of drawings]

FIG. 1 is a schematic view of an essential part showing an embodiment of the present invention, FIG. 2 is a plan view of a loom, FIG. 3 is a plan view of a weft storage device, and FIG.
FIG. 5 is a side view of the weft storage device, FIG. 5 is a block diagram showing a hardware configuration of a control circuit, FIGS. 6 and 7 are flow charts showing control contents, and FIG. 8 is a weft tension showing another embodiment. It is a schematic diagram of a detector. 11 …… Weft, 14 …… Weft storage device, 16 …… Main nozzle, 29
...... Locking pin, 45 ...... Electro-pneumatic proportional valve, 51 ...... Control circuit, 53,57 ...... Weft tension detector (strain gauge), 75 ...... Movable roller, 76 ...... Support

Claims (1)

[Claims] 1. A weft thread (11) wound around a drum (24) is weft-inserted by a weft insertion nozzle (16), and the weft thread (11) is engaged with a locking pin (29) protruding into the drum (24). A fluid-jet loom that restricts the length of one weft insertion by stopping the weft, when the weft is locked to the locking pin (29) at the end of flight.
The weft tension detector (53, 77) that detects the tension of (11) is compared with the tension at the end of flight of this weft (11) and the reference tension, and according to the difference, the weft insertion nozzle (16) And a control means (45, 51) for controlling the supply fluid or the rotation speed of the main shaft of the loom.