JPH0713339B2 - Automatic adjustment device for arrival timing of weft insertion device - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a weft inserting device for a fluid jet loom, and more particularly to a device for automatically adjusting the arrival timing of weft threads during operation of the loom.

Prior art For example, the inventions of JP-A-56-96938 and JP-A-56-107046 target the arrival timing of the weft thread by changing the pressure of the weft insertion fluid during weaving or the rotation speed of the loom. It indicates that the control is performed at the arrival timing of.
In this case, the pressure of the wetting fluid or the rotation angle at which wefting is started is preset as the control amount in accordance with the deviation between the actual arrival timing and the target arrival timing.

However, in the actual weaving process, the weaving condition of each loom and the external conditions such as temperature and humidity are different from those at the trial weaving stage, so naturally the relationship of the control amount to the deviation is also different. There is. For this reason, even if the control amount for the deviation, for example, the change amount of the pressure is preset in the trial weaving stage, such a relationship does not match due to changes in various conditions in the actual weaving stage. Can also be considered. For this reason, accurate control cannot be performed for each loom or for changes in external conditions, and a response time longer than necessary is required to eliminate the deviation.

Therefore, an object of the present invention is to set the pressure of the wetting fluid and the injection start timing as the operation setting values of the wetting nozzle in order to match the actual arrival timing with the target arrival timing during weaving. It can be automatically adjusted for each cycle, and can quickly respond to changes in the loom conditions for a large number of loom groups in high-mix low-volume production operations, and by stabilizing the weft insertion during weaving after that, weaving It is to stabilize the quality.

SUMMARY OF THE INVENTION Accordingly, the present invention is directed to the operation of a weft insertion nozzle when a predetermined condition such as a predetermined number of picks, a predetermined time, or an actual arrival timing exceeds an allowable value of a target arrival timing during weaving. Weaving is performed while sequentially changing the pressure value of the fluid and the injection start time as a set value to multiple values within a range that does not affect weaving, and in the process of changing, the actual arrival timing for the operation set value is measured, and then Then, the relationship between each operation set value and the actual arrival timing for each operation setting value is obtained. The weft insertion nozzle is operated according to the calculated operation setting value obtained thereafter.

In such control, the arrival timing of the weft thread is automatically adjusted to the target value in response to the conditions unique to the loom, external conditions, and physical changes of the weft thread itself.

Configuration of the Invention FIG. 1 shows an automatic arrival timing adjusting device 20 of the present invention in relation to a weft insertion control device 1 to be controlled.

The weft insertion device 1 is equipped with a weft insertion nozzle 5 for wefting a weft thread 2 into a warp thread opening 4 together with a weft insertion fluid 3. The weft yarn 2 is supplied by the yarn feeder 6 and is guided to the inside of the rotary yarn guide 8 via the balloon guide 7. This rotating yarn guide 8
Is measured while being wound around the outer circumference of the drum 9 by a rotational movement relative to the length measurement storage drum 9. During this time, the drum 9 stores the weft thread 2 until the time of weft insertion. On the outer periphery of the drum 9, the weft thread 2 is locked by a locking pin 10 during length measurement storage. The locking pin 10 is driven by the actuator 11 and retracts at the weft insertion timing to set the weft yarn 2 in the stored state to the unwound state on the outer peripheral surface of the drum 9, and the weft insertion is performed via the yarn guide 12. The nozzle 5 allows the weft insertion.

On the other hand, the fluid 3 is supplied from the pressure fluid source 13, passes through the pressure control valve 15, the accumulator tank 16 and the opening / closing valve 17 in the pipe line 14,
It has reached the weft insertion nozzle 5. The weft thread 2 is moved by the weft insertion nozzle 5 along with the jet flow of the fluid 3 and the warp thread opening 4
After being put inside, it is struck by the reed 18 and becomes a woven fabric 19.

Then, the arrival timing automatic adjusting device 20 of the present invention is, on the input side, a weft insertion condition command device 21, a reaching sensor 22, a rotation angle detector 23 and a storage device 25 connected to the weft thread selection command device 24, on the input side. An arithmetic unit 27 connected to the storage unit 25 and the target setting unit 26, further connected to the arithmetic unit 27 on the input side and the wed insertion condition command unit 21 and connected to the pressure control valve 15 on the output side. It is composed of a controller 28. The controller 28 is also connected to the on-off valve 17.

Further, the rotation angle detector 23 is a command device such as a counter.
29 and the input terminal of the comparator 30, and the arrival sensor 22 and the target setter 26 are both connected to the comparator 30.
Is connected to the other input end of. Then, the above-mentioned command device 29
Is connected to the setter 31 for setting the adjustment period at the other input terminal, and is connected to the comparator 30 at the output side. This comparator 30 determines the target arrival timing Θ for each predetermined rotation angle θ.
And the actual arrival timing θ _k are compared with each other, and a signal necessary for the adjusting operation is sent to the weft insertion condition command device 21 according to the result of the comparison.

Action of the Invention First, at the stage of trial weft insertion before weaving, the weft insertion condition command device 21 sets, for example, the pressure value of the fluid 3 for each rotation of the loom.
In order to sequentially change p ₁ , p ₂ ... P _n within a predetermined range, an output is generated and sent to the controller 28. So this controller
28 operates the pressure control valve 15 to sequentially change the pressure of the fluid 3 from the pressure fluid source 13 as shown in FIG. The controller 28 also controls the opening timing θ _o and the closing timing θ _e of the opening / closing valve 17 in synchronization with the rotation angle θ of the loom. In this embodiment, the opening / closing timing is always set to be constant. During this time, the weft insertion nozzle 5 injects the fluid 3 with different pressure values p ₁ , p ₂ ··· p _n each time weft insertion, and experimentally wefts the weft thread 2 into the warp thread opening 4. .

On the other hand, the arrival sensor 22 detects the actual arrival timings θ ₁ , θ ₂ · of the weft yarn 2 wefted in at a predetermined position, for example, a position corresponding to the weaving width on the non-feeding side during trial weft insertion.
・ Θ _n is detected in relation to the rotation angle θ. At the stage of such trial weft insertion, the memory device 25 stores the pressure values p ₁ , p ₂ ... P _n from the weft insertion condition command device 24 and the actual arrival timings θ ₁ , θ ₂ corresponding to that time. and ·· θ _n in relation to the rotation angle θ of the loom, and sequentially stored. When the weft insertion is multicolored, the memory device 25 stores the pressure values p ₁ and p ₂ for each weft yarn based on the selection signal from the weft yarn selection command device 24.
..P _n and actual arrival timings θ ₁ , θ ₂ ..θ _n
Are sequentially stored in a predetermined address while being divided. Further, the number of such trial weft insertions is determined by the required control accuracy. The relationship of such changes in the actual arrival timings θ ₁ , θ ₂ ··· _n with respect to the pressure values p ₁ , p ₂ ··· p _n is usually expressed as a straight line graph as shown in FIG. 2. It

In addition, the target arrival timing Θ is input to the calculator 27 by the target setting device 26 in advance by the operator, and when the trial weft insertion as described above is completed, the calculator 27
Performs the actual arrival timing theta ₁ was determined in the stage of trial _picking, and θ ₂ ·· θ _n, after the relationship between the pressure values p _1, p ₂ ·· p _n of the fluid 3, or interpolation , The pressure value P corresponding to the target arrival timing Θ is obtained and output to the controller 28. Therefore, the controller 28 controls the pressure control valve 15 to automatically set the fluid 3 to the target pressure value P. At this stage, the weft insertion condition command device 21 is in a dormant state.

In this way, the pressure of the fluid 3 is automatically set before the actual weaving. Therefore, during the subsequent operation of the loom, the weft insertion device 1 performs the normal weft insertion operation with the fluid 3 having the target pressure value P.

Then, the arrival timing automatic adjusting device 20 synchronously starts the adjusting operation even while the loom is in operation. That is,
The command device 29 outputs a command signal to the comparator 30 in a predetermined cycle, for example, a predetermined number of picks or a predetermined time after the operation of the loom is started. At that time, the comparator 30 measures the actual arrival timing θ _k in the subsequent weft insertion cycle, determines the magnitude relationship between this value and the target arrival timing Θ, and based on this result, the weft insertion A signal required for adjustment is given to the condition command device 21. Actual arrival timing θ _k
Is equal to the target arrival timing Θ or is within its allowable range, no special control is required, and therefore the weft insertion condition command unit 21 continues the current state. However, when the actual arrival timing θ _k is later than the target arrival timing θ, it is necessary to increase the pressure of the fluid 3. On the contrary, when the actual arrival timing θ _k is earlier than the target arrival timing Θ, the pressure of the fluid 3 may be adjusted to decrease. In this way, the comparator 30 gives an appropriate command to the wedging condition command device 21 in accordance with the result of size comparison. Therefore,
The weft-insertion condition command device 21 operates the controller 28 so that the current pressure value p _k of the fluid 3 is set as the operation set value in the direction in which the weaving condition is gradually increased or decreased by a predetermined value within a range where the weaving does not significantly change. To change. Already seen, when the actual arrival timing theta _k is behind the goal arrival timing Θ is the pressure value p _k of the fluid 3, the pressure value p _1, p ₂ ·· p _n in the direction of increasing, It can be changed sequentially. On the contrary, when the actual arrival timing θ _k is earlier than the target arrival timing Θ, the pressure value p of the fluid 3 is
_k is gradually changed in the decreasing direction as pressure values p ₁ , p ₂ ... P _n . During this time, the memory 25 stores the actual arrival timing θ ₁ for each pressure value p ₁ , p ₂ ··· p _n ,
Load the θ ₂ ·· θ _n from the picking condition command unit 21 and the arrival sensor 22, they as in the third view in a state of being associated, successively stored. Of course, as described above, in the case of multi-colored weft insertion, since these memories are stored for each weft thread, the memory device 25 works in conjunction with the weft thread selection commander (not shown) to sort each weft thread type. The pressure values p ₁ , p ₂ ··· p _n and the actual arrival timing θ ₁ ,
Stores θ ₂ ··· θ _n .

Predetermined pressure values p ₁ , p ₂ ,
When the p _n is set several times, the computing unit 27 determines the pressure values p ₁ , p ₂ ··· p _n as the operation set values and the actual arrival timings θ ₁ , θ ₂ ·· θ _n for them. Then, the pressure-arrival timing correlation is determined from this, the pressure value P corresponding to the target arrival timing Θ is determined, and this pressure value P is output to the controller 28 as a new pressure value thereafter. In this way, the pressure value P of the fluid 3 is adjusted to an appropriate value according to the actual weaving condition for each predetermined condition.

It should be noted that the pressure value P corresponding to the target arrival timing Θ is within a range from the maximum operation set value to the minimum operation set value in which the pressure value P changes, so that the variation Δθ in the arrival timing does not become too large. The adjustment period is set. When set in such a state, it is effective when the variation amount Δθ increases as the weaving progresses due to the winding diameter of the yarn supplying body 6 and the like.

In the above specific example, the target arrival timing is first compared with the magnitude relationship between the actual arrival timing θ _k and
Although the direction in which the current pressure value p _k is changed has been determined, the pressure of the fluid 3 is changed in the increasing direction or the decreasing direction by a preset amount regardless of the magnitude relation, and from this, Pressure values p ₁ , p _2, ... P _n and actual arrival timing θ
_The pressure value P corresponding to the target arrival timing Θ may be calculated by obtaining the correlation with ₁ , θ ₂ ··· θ _n . In this case, it is also predicted that the required pressure value P deviates from the calculated line segment, so the accuracy of the control depends on the pressure values p ₁ and p _2.
.. The accuracy of control is inferior as compared with a method in which the increasing / decreasing direction of _pn is predetermined.

In the above example, the relationship between the pressure value and the arrival timing is obtained by a straight line expression, but even if there is a curved relationship under the type of weft thread and other conditions, the relationship is similarly determined from a plurality of measured values. May be calculated. Also,
The pressure value is changed every time the weft is inserted, and the corresponding arrival timings θ ₁ , θ ₂ ··· θ _n are stored, but the pressure value is changed for each predetermined number of weft insertions, and the obtained arrival timing is obtained. A more accurate relationship can be obtained by sequentially storing the average values of θ ₁ , θ ₂ ... θ _n .

Other Embodiments In the above embodiment, as the weft insertion condition, only the pressure of the fluid 3 is set as the operation set value.
In addition to the pressure, as described above, the weft insertion nozzle 5
May be the injection start timing, and therefore the control target of the controller 28 may be the on-off valve 17.

FIG. 4 shows the actual arrival when the pressure value P of the fluid 3 is fixed and the injection start timing of the weft insertion nozzle 5, that is, the opening timings θ ₀₁ , θ ₀₂ ... θ _0n of the opening / closing valve 17 are changed. Changes in the timings θ ₁ , θ ₂ ··· θ _n are shown together with a target arrival timing Θ and an appropriate opening timing Θ ₀ . In this graph, the opening time of the on-off valve 17 is constant for convenience.

As can be understood from this embodiment, the operation set value is not limited to the pressure of the fluid 3 and may be a weft insertion start timing, or a combination of those pressures and start timings.

Further, the arrival timing automatic adjusting apparatus 20 of the present invention is displayed by functional blocks for convenience of description, but each of these parts is configured as a part of a control computer, and is also executed in the field of the program of the computer. it can.

Further, in the above embodiment, the control operation is started when the predetermined number of picks has elapsed. However, the start of the control operation is not limited to this, and the control may be started when the actual arrival timing exceeds the allowable value for the target arrival timing. This judgment is executed by the command device 29.

The object to be controlled is not limited to the weft insertion nozzle 5 on the yarn feeding side, but may be a group of auxiliary weft insertion nozzles arranged along the flight path to urge the weft yarn 2 in flight. Good.

EFFECTS OF THE INVENTION In the present invention, for each predetermined condition, at least one of the pressure value of the weft insertion fluid and the start timing of the weft insertion is positively changed as a motion set value within a range that does not affect weaving. The correlation of the actual arrival timing for each operation setting value is obtained by this, and the target arrival timing is automatically adjusted from this relationship, so the weft insertion conditions suitable for each loom are set,
Further, even when external conditions or physical properties of the weft yarn change during the progress of weaving, an appropriate weft insertion condition can be set accurately and quickly.

[Brief description of drawings]

FIG. 1 is a block diagram of a mechanical structure of a weft insertion control device and an automatic arrival timing adjusting device of the present invention. FIG. FIG. 4 is a graph of the relationship between the pressure value during weaving and the actual arrival timing, and FIG. 4 is a graph of the relationship between the injection start timing and the actual arrival timing in another embodiment. 1 ... weft insertion device, 2 ... weft thread, 3 ... fluid, 4 ...
… Warp thread opening, 5 …… Weft insertion nozzle, 6 …… Thread feeder,
13 ... Pressure fluid source, 15 ... Pressure control valve, 17 ... Open / close valve,
20 …… Automatic arrival timing adjuster, 21 …… Horizontal condition commander, 22 …… Arrival sensor, 23 …… Rotation angle detector,
24 …… Weft thread selection commander, 25 …… Memory device, 26 …… Target setting device, 27 …… Computer, 28 …… Control device, 29 …… Commander, 30
…… Comparator, 31 …… Setting device.

Claims (4)

[Claims] 1. A weft insertion device for inserting a weft thread into a warp thread opening by the pulling force of a weft insertion nozzle, and an arrival sensor for detecting an actual arrival timing of the weft thread in a weft insertion cycle, and a predetermined interval during weaving. When a command device that outputs a command signal and the above command signal are input, the weft-insertion condition command is used to increase or decrease the current weft-insertion nozzle operation set value multiple times within a range where there is no significant change in the weaving state. The relationship between [operation set value-actual arrival timing] from each operation set value and the actual arrival timing for this, and the storage device that stores the actual measured arrival timing corresponding to each operation set value. Calculate the new operation set value corresponding to the target arrival timing from this relationship, and based on the new operation set value, enter the above A controller for controlling the supply of pressure fluid for weft insertion from a pressure fluid source to the nozzle, and an automatic arrival timing adjusting device for the weft insertion device. 2. The weft depositing apparatus according to claim 1, wherein the controller controls a pressure control valve interposed between the pressure fluid source and the weft depositing nozzle as the weft depositing condition. Arrival timing automatic adjustment device. 3. The weft insert according to claim 1, wherein the controller controls the opening / closing timing of an on-off valve interposed between the pressure fluid source and the weft insertion nozzle as a weft insertion condition. Automatic arrival timing adjustment device. 4. The storage device according to claim 1, wherein the storage device is linked with a weft yarn selection signal from a weft yarn selection command device and stores arrival timing and weft insertion conditions for each type of weft yarn. Automatic adjustment device for the arrival timing of the horizontal insertion device.