JPH0586543A - Fluid jet loom - Google Patents

Abstract

PURPOSE:To provide the subject loom designed to substantially shorten working time and manhour by calculating nozzle characteristics based on the weft unwinding timing data detected while changing nozzle jet pressure and by setting the optimal picking conditions using these characteristics. CONSTITUTION:In setting the optimal picking conditions in an air jet loom, the minimal weft delivery speed is calculated from the input data of the initial values such as number of revolutions, weaving width and yarn type. Along with this, the initial pressures and timings for the main nozzle and subnozzles are set, respectively. Then, weft unwinding timing is measured while variously changing the pressure of air to be fed to the main nozzle through inching operation to set the minimal main nozzle pressure enabling weft reach, the respective jet timings for the main nozzle and subnozzles. A normal operation is then started, and if real reach timing is later than the aimed timing, the main nozzle pressure is raised to make a regulation so that both the timings get equal to each other, and under this final main nozzle pressure, subnozzle pressures are regulated in a similar manner to that mentioned above to eliminate unnecessary air consumption, thus setting the final pressures.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid jet loom, and more particularly to a technique for setting weft insertion conditions.

[0002]

2. Description of the Related Art In a fluid jet loom, when starting, weft insertion is performed by injecting air from a main nozzle or a sub nozzle at a preset pressure or timing. Change, the weft may not reach the side opposite to the weft insertion side, or a yarn break may occur.

Therefore, conventionally, at the time of starting the loom,
The operator changes the pressure, timing and the like several times while observing the weft insertion state so that the weft reaches the opposite weft insertion side. After the start-up setting of the loom is completed by such work, for example, the weft insertion automatic control, that is, the weft arrival time to the opposite weft insertion side is measured to be the target value, and the weft arrival time is measured to be the target value. The normal operation is started by activating the system that controls the injection pressure of the main nozzle (the pressure of the air supplied to the nozzle) based on the deviation.

[0004]

However, in such a conventional configuration, the operator sets the weft insertion through experience and intuition until the start setting of the loom is completed and the automatic weft insertion control is performed. Since the work is performed while checking the state, it takes a lot of work time. Therefore, the following technique has been conventionally proposed (see Japanese Patent Laid-Open No. 59-125941).

That is, this device is configured such that the jetting pressure of the main nozzle or the like according to the yarn type is previously determined and stored as data, and this data is read and set at the time of starting. However, in this device, even with the same yarn type, since the weft pulling characteristics are different depending on the storage state of the yarn, the arrangement of the length measuring device, etc., it is difficult to set so that normal weft insertion is performed, It may take a long time to start the normal operation.

In view of the above conventional problems, the present invention is based on the weft unwinding timing detected while variously changing the pressure of the air supplied to the nozzle for weft insertion by air injection. Is calculated and the weft insertion condition is set from this nozzle characteristic, thereby aiming to shorten the time until the normal operation starts.

[0007]

Therefore, in the fluid jet loom of the present invention, as shown in FIG. 1, the nozzle for inserting the weft yarn by air jet and the pressure of the air supplied to the nozzle are variously changed. And means for detecting weft unwinding timing data, means for calculating nozzle characteristics based on the detected weft unwinding timing data, and means for setting weft insertion conditions based on the calculated nozzle characteristics , And are configured to include.

The weft unwinding timing is a general term for the time during which a weft of a predetermined length is pulled out from the start of weft insertion during the weft insertion period from the weft measuring device. Are using. That is, if the rotation speed of the main shaft of the loom is constant, the rotation angle of the main shaft can be replaced with time. As the weft length measuring device, there are a drum type device, a device floating in the air flow, a device attached to a surface, and the like. Further, as a means for detecting the weft yarn unwinding timing data, there is a means for arranging a sensor at a predetermined position in the warp shed to detect the timing when the weft tip reaches the sensor position.

[0009]

In this structure, the jet pressure of the nozzle and the unwinding timing of the weft yarn are determined substantially uniquely. Utilizing this, first, the nozzle characteristics are calculated based on the weft unwinding timing data, and weft insertion conditions such as nozzle injection pressure and timing are set so that the wefts fly normally. Weft insertion conditions are set quickly.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings. In FIG. 2, a main nozzle 1 inserts the weft Y by air injection, and air is supplied from a pressure air supply source 2 through an electropneumatic proportional valve 3, a surge tank 4 and an electromagnetic on-off valve 5. It Therefore, the injection pressure of the main nozzle 1 (the pressure of the air supplied to the main nozzle 1) can be controlled by controlling the voltage to the electropneumatic proportional valve 3, and the injection start timing and the injection end timing of the main nozzle 1 are electromagnetic on-off valves. Controlled by 5.

The weft yarn Y is pulled out from the yarn feeder 6 and is guided to the main nozzle 1 through a weft measuring and storing device 7. The weft measuring and storing device 7 includes a drum 9 which is held in a stationary state by being rotatably supported by a distal end of a hollow rotary shaft 8 which is rotationally driven by a motor (not shown), and an oblique forward direction from the hollow rotary shaft 8. An electromagnetic actuator 11 is provided for the winding arm 10 protruding and communicating with the hole provided on the peripheral surface of the drum 9.
Has a weft holding claw 12 that is driven in and out by a drive mechanism. The weft Y is held by the weft holding claw 12 in the thrust state, and the weft Y is wound around the drum 9 by the rotation of the winding arm 10 to measure the length. Store. Then, the weft holding claw 12 is retracted at a predetermined claw removal timing (weft insertion start timing), and the weft Y on the drum 9 is pulled out through a fixed guide (not shown) by the air injection of the main nozzle 1 for weft insertion. ..

The weft yarn Y ejected from the main nozzle 1 is
The weft guide path is formed by a row of recesses formed on the reed wing of a reed (not shown), and is sub-nozzles 16 arranged at a predetermined interval here to blow it in a relay manner for weft insertion. The sub-nozzles 16 are grouped by several (4 in the figure), and from the surge tank 18 connected to the pressure air supply source 2 via the electropneumatic proportional valve 17, via the electromagnetic on-off valves 19, respectively. Is supplied. Therefore, the injection pressure of the sub-nozzle 16 (the pressure of the air supplied to the sub-nozzle 16) can be controlled by controlling the voltage to the electropneumatic proportional valve 17, and the injection start timing and the injection end timing of the sub-nozzle 16 are controlled by the electromagnetic on-off valves 19. Controlled.

As a control input to the detector 20a of the main controller 20, a signal output from the angle sensor 21, a signal output from the weft unwinding sensor 22, and a signal output from the weft arrival sensor 23. Is entered. The angle sensor 21 outputs a signal corresponding to the rotation angle of the loom main shaft (hereinafter referred to as the loom main shaft rotation angle).

The weft yarn unwinding sensor 22 detects the passage of the weft yarn Y which is unwound around the drum 9 when the weft is inserted near the drum 9. Since the weft unwinding signal due to the passage of the weft Y is obtained every time one turn is unwound, assuming that one pick is n turns, it is obtained n times until the weft insertion is completed. The weft arrival sensor 23 detects the arrival of the weft Y that has been inserted on the opposite side of the weft guide passage.

Here, the main controller 20 controls the injection pressure of the main nozzle 1 via the electropneumatic proportional valve 3 by performing a predetermined arithmetic processing by a built-in microcomputer based on these control inputs. , The injection timing of the main nozzle 1 is controlled via the electromagnetic on-off valve 5, and the electromagnetic actuator 1
The operation of the weft yarn holding claw 12 is controlled via 1. Further, the injection pressure of the sub nozzle 16 is controlled via the electropneumatic proportional valve 17, and the injection timing of the sub nozzle 16 is controlled via the electromagnetic opening / closing valve 19.

The angle sensor 2 controls the ejection of the main nozzle 1 and the sub nozzle 16 and the operation of the weft holding claw 12.
Loom spindle angle and weft unwinding sensor 2 detected by 1
The generation of the weft unwinding signal output from 2 is monitored and performed.
That is, when the main shaft angle of the loom reaches the injection start timing, the electromagnetic on-off valve 5 is turned on (open) to start air injection from the main nozzle 1.

Next, when it is time to remove the claws (weft insertion start time), the electromagnetic actuator 11 is turned on to extract the weft holding claws 12, thereby starting the weft insertion.
During weft insertion, when the loom main spindle angle reaches the injection start timing for each group, air is jetted from the sub-nozzles 16 of the group at that position as the tip of the weft Y flies, The electromagnetic opening / closing valve 19 is turned on (open) to start air injection from the auxiliary nozzle 16. Then, at the injection end timing, the electromagnetic on-off valve 19 is turned off (closed) to end the air injection from the sub nozzle 16.

When the injection end time comes, the electromagnetic on-off valve 5 is turned off (closed) to end the air injection from the main nozzle 1. Further, when the n-th unwinding signal is received from the weft unwinding sensor 22, the electromagnetic actuator 11 is turned off and the weft holding claw 12 is thrust. This allows
When the weft insertion for n turns is completed, the weft Y is locked by the weft holding claw 12 and the weft insertion is completed.

Here, in this embodiment, when weaving at the time of machine weaving, the weft is inserted into the warp shed row while rotating the main shaft at a slow speed, and weft insertion conditions are set when the weft is inserted. The weft flying condition data is detected while various changes are made, and the weft insertion condition is set based on the detected data. Such control is executed by the main controller 20.

That is, the data signal from the input means 24 is input to the main controller 20. Further, the main controller 20 is
The detector 20a, the arithmetic unit 20b, the storage unit 20c, and the weft insertion condition command unit 20d are used. The weft insertion condition setting control of the present invention is executed by these various means, and a driving circuit 25 for driving various operation means is provided. Output a control signal. Here, the weaving work at the time of changing the weaving machine is to install a full-roll warp beam on the loom, bind the warp of this warp beam to the weaving portion cut before weaving, and perform new weaving. However, at this time, since no tension is applied to the warp, the upper and lower warps are not entangled during the opening / closing movement of the warp even if the normal operation is performed as it is, and the weft insertion cannot be reliably performed because the upper and lower warps are entangled. Therefore, it is necessary to perform a weaving operation in which the operation of rotating the loom at a slow speed and inserting the weft yarn into the warp opening row is repeated many times to weave a woven fabric that does not become a product for about 1 m to 2 m.

In order to set the weft insertion condition by utilizing this weaving operation, a device for inserting the weft into the warp shed row while rotating (inching) the spindle at a slow speed (referred to as a weaving mode inching device). .)Is required. Therefore, before describing the weft insertion condition setting control, the configuration of the weaving mode inching device will be described.

At the time of inching operation, the spindle is about 30 r.p.
It rotates in the forward direction at a slow speed of m. Then, the same operation is performed during normal operation. In this case, since the rotation speed of the main shaft is about 1/20 as slow as that during normal rotation, it is necessary to open the electromagnetic on-off valves 5 and 19 in accordance with the flight of the weft Y. Therefore, in order to perform air injection equivalent to that during normal operation, the electromagnetic on-off valves 5, 1 are operated in response to a signal from the angle sensor 21.
As shown in FIG. 3 (b), the main controller 20 transmits a pseudo signal whose interval between the opening timings of 9 is set to be narrow, and the main nozzle 1 and the sub-nozzle 16 are rotated within an angle of about 1/20 of the normal operation. It is necessary to inject air from. Explaining this in detail, in normal operation,
The main shaft of the loom is rotating at high speed, and the main nozzle 1,
At the timing shown in FIG. 3A, the sub-nozzle 16 opens and closes the respective electromagnetic on-off valves 5 and 16 so as to inject air in accordance with the flying position of the weft yarn tip.

However, at the time of inching, the main shaft rotates at a slow speed, but the wefts fly at a speed equivalent to that during normal operation. Therefore, if the signal from the angle sensor 21 is picked up as it is and the electromagnetic on-off valves 5 and 19 are operated, the sub-nozzle 16 that does not inject air comes out. Therefore, the main control device 20 outputs the signal from the angle sensor 21. Is not output as it is to each of the solenoid on-off valves 5 and 19, but a pseudo signal (with a pulse time width substantially the same as that in normal operation derived from the speed in normal operation, triggered when the angle during inching reaches 150 degrees, ( (See FIG. 4), a signal is output to each electromagnetic on-off valve 5, 19 with the same weft insertion time width as during normal operation, whereby the weft thread fly without making any improvements to each electromagnetic on-off valve 5, 19. The weft can be made to fly depending on the running position. That is, in the main controller 20, during normal operation, the electromagnetic on-off valves 5 and 19 are opened and closed at the timing shown in FIG. 3A, and the weft holding claw 12 releases the locking of the weft Y. Thus, a pseudo signal is generated to operate each electromagnetic on-off valve 5, 19.

The operation will be described in detail. During normal operation, the angle sensor 21 moves the spindle from 0 degrees to 360 degrees.
Pulses are generated at even intervals when rotating up to 4 degrees and are input to main controller 20. At this time, the main controller 20 counts the number of pulses, and according to the counted number,
At the timing shown in (a), an opening / closing signal is output to the electromagnetic opening / closing valves 5 and 16 so that the main nozzle 1 and the sub nozzle 16 inject air. Then, in the inching mode, in the main controller 20, the pulse input from the angle sensor 21 is the same as in the normal operation, but the rotation angle of the main shaft is recognized by the pulse signal, and it becomes 150 degrees. Sometimes a pseudo pulse is generated. The main controller 20 counts the number of pulses at this time and outputs a signal to open and close each of the electromagnetic on-off valves 5 and 19 at the same count as in normal operation,
Further, since each of the solenoid on-off valves 5 and 19 is operated so that the weft holding claw 12 releases the locking of the weft, as shown in FIG. 3 (b), the main nozzle 1 and the sub-nozzle are operated according to the flying position of the weft. 16 jets air and wefts fly stably. Then, the weft unwinding sensor 22 detects the unwinding of the weft Y, and operates the electromagnetic on-off valves 5, 19 so that the weft holding claw 12 locks the weft with a predetermined number of unwinding.

Next, the first weft-insertion condition setting control of the present invention utilizing inching by such an inching operation device.
The embodiment will be described with reference to the flowcharts of FIGS. 5 and 6 and the characteristic diagrams of FIGS. 7 to 10. In the flowcharts of FIGS. 5 and 6, step 1 (denoted as S1 in the drawings).
In the following (same), the input means 24 inputs initial values such as the rotation speed, the weaving width L, the unwinding number YN from the drum 9 for one weft insertion, and the yarn type. In step 2, the minimum feeding speed when the weft Y is unwound from the weft measuring and storing device 7 is calculated from these input data. In step 3, the initial pressure and timing of the main nozzle 1 and the initial pressure and timing of the sub-nozzle 16 are set arbitrarily. Here, the sub nozzle 16 is set to a pressure higher than the average pressure value normally used in the past. In step 4, inching is started. In step 5, the timing of unwinding the weft Y from the weft measuring and storing device 7 is measured,
The delivery speed is calculated from this measured value. That is, since a pulse signal is output from the weft unwinding sensor 22 each time the weft Y passes, the weaving width L and the unwinding number YN for one pick are obtained.
From this, the length of one winding of the weft Y on the drum can be obtained from L / YN. Then, the weft yarn Y is separated from the drum 9 by dividing it by the transmission interval time of the pulse signal.
The average speed of unwinding, that is, the delivery speed can be calculated.

In step 6, it is determined based on the measured value of the unwinding timing whether or not the sending speed has linearity, that is, whether or not there is a speed slump. That is, if the delivery speed changes as shown by the solid line in FIG. 9 and the speed has linearity, there is no problem, and the process proceeds to step 7, where the delivery speed changes as shown by the dotted line in FIG. If anyone exists, there is a problem, so go to step 8. In this step 8, the main nozzle jetting end timing is delayed and the process returns to step 5 again to measure the weft unwinding timing after the main nozzle jetting end timing is delayed. In step 7, the main nozzle injection pressure condition is changed, and in step 9, the weft unwinding timing (T _cy1, T _cy2, ...) Corresponding to the changed main nozzle injection pressure condition is measured.

In step 10, it is judged whether or not the main nozzle injection pressure condition has been changed a predetermined number of times (N times), and when the predetermined number of main nozzle injection pressure conditions have been changed,
In step 11, if the change of the predetermined number of main nozzle injection pressure conditions is not completed, the process returns to step 4 and the operations of steps 4 to 9 are performed again. At the stage of proceeding to step 11, the relational expression (delivery characteristic) between the injection pressure of the main nozzle and the delivery speed as shown in FIG. 13 is determined.

In step 11, the lowest main nozzle jet pressure at which the weft can reach is calculated and set based on the above-mentioned delivery characteristics. It should be noted that this value is set as the minimum limit value of the injection pressure of the main nozzle thereafter, and setting of a pressure value lower than this value is prohibited. Next, in step 12, the injection start / end timing of the main nozzle 1 and the injection start / end timing of the sub-nozzle 16 are set based on the set injection pressure of the main nozzle 1. The method of setting the injection start / end timing of the main nozzle 1 and the sub nozzle 16 will be described later.

Then, the normal operation of the loom is started in step 13, the arrival timing and the unwinding timing are measured, and the time difference, that is, the speed difference is calculated in step 14, and the process proceeds to step 15. In this step 15, the measured actual arrival timing is compared with the target arrival timing, and if the actual arrival timing is equal to or more than the target arrival timing, that is, the actual arrival timing is later than the target arrival timing, the process proceeds to step 16 to perform the main nozzle injection. After increasing the pressure and proceeding to step 17, after changing the injection start / end timing of the main nozzle 1 and the sub nozzle 16 according to the changed main nozzle injection pressure, the process returns to step 14 again to measure the arrival timing, Step 15
Go to and compare the actual arrival timing with the target arrival timing. That is, the main nozzle injection pressure is increased until the actual arrival timing is equal to or earlier than the target arrival timing, and if the actual arrival timing is equal to or earlier than the target arrival timing, the process proceeds to step 18.

Here, in step 16, the finally changed main nozzle injection pressure becomes the finally determined main nozzle injection pressure. Next, in step 18, the sub-nozzle injection pressure is lowered, and in step 19, the arrival timing and the unwinding timing are measured, and the time difference, that is, the speed difference is calculated. This shows the meandering amount of the weft, and there is an optimum meandering amount in terms of a stable flying state and the quality of the fabric to be woven, which varies depending on the yarn type. In this embodiment, it is assumed that the meandering amount is as small as possible, that is, the time difference is as small as possible and the wefts fly straightly.

In step 20, the measured speed difference X
_T is compared with a value (A · X) obtained by multiplying the speed difference X before lowering the sub-nozzle injection pressure in step 18 by a constant A. This constant A sets the permissible range of the meandering amount that can maintain the fabric quality even if the sub-nozzle injection pressure is lowered (see FIG. 10). If it is determined in step 20 that X ≧ A · X, the meandering amount is large, and therefore the process proceeds to step 22 to stretch the weft, and the sub-nozzle injection pressure is increased.

If X <A · X is determined, the routine proceeds to step 21, where the arrival timing is compared with the target arrival timing, and the arrival timing <= target, that is, when the arrival timing is earlier than or equal to the target value. , Step 18
To lower the injection pressure of the sub-nozzle and reach the timing>
When the target value, that is, the arrival timing is later than the target value, the process proceeds to step 22 and the sub-nozzle injection pressure is increased.

Here, in step 22, the finally changed sub-nozzle injection pressure becomes the finally determined sub-nozzle injection pressure. In step 23, control is performed to accelerate the main nozzle injection end timing, and the process proceeds to step 24 to compare the measured actual arrival timing with the target arrival timing, and the actual arrival timing is less than or equal to the target arrival timing, that is, the actual arrival timing is If it is faster than or equal to the target arrival timing, the process returns to step 23 to perform control to further accelerate the main nozzle injection end timing to eliminate unnecessary air consumption.

If the actual arrival timing is later than the target arrival timing, the routine proceeds to step 25, where the main nozzle injection end timing is returned by one. The main nozzle injection timing is finally determined by the main nozzle injection end timing returned to the previous one. Step 26
Then, the sub-nozzle injection start timing is set from the unwinding timing, the process proceeds to step 27, control is performed to accelerate the sub-nozzle injection end timing, the process proceeds to step 28, and the measured actual arrival timing and the target arrival timing are compared, If the actual arrival timing is less than or equal to the target arrival timing, that is, if the actual arrival timing is equal to or faster than the target arrival timing, the process returns to step 27 to further accelerate the sub-nozzle injection end timing to eliminate unnecessary air consumption. If the actual arrival timing is later than the target arrival timing, the process proceeds to step 29, and the sub-nozzle injection end timing is returned by one. The sub-nozzle injection timing is finally determined by setting the sub-nozzle injection end timing returned to the previous one.

In the above embodiment, the weft is inserted into the warp shed opening row while rotating the main shaft at a slow speed from step 1 to step 12, and the main nozzle jet pressure is variously changed as the weft insertion condition at this time. The weft unwinding timing is measured as the weft flying condition data, the main nozzle injection pressure is set based on this data, and the injection start / end timings of the main nozzle 1 and the sub nozzle 16 are set. From 13, normal operation, that is,
The weft insertion condition is set by performing various operations such as main nozzle injection pressure, sub-nozzle injection pressure, main nozzle injection timing, and sub-nozzle injection timing while performing regular operation. ing. This is because the weft is inserted into the weft opening that opens and closes at a slow speed during weaving, the weft unwinding timing is measured, and the sensitivity characteristic of the weft delivery speed with respect to the jet pressure of the main nozzle is measured, indicating that the weft is reachable. Since the minimum main nozzle injection pressure is calculated and set, the weft insertion is ensured even after the spindle is rotated at the normal operating speed, and the weft insertion condition is gradually changed from that state to calculate and set the optimum condition. You can do it. As a result, the time required for regular operation can be extremely shortened.

In the above embodiment, the normal operation is performed from step 13. However, from step 13 onward, the sub-nozzle injection end timing from step 29 is finally set at the slow speed during weaving. After that, normal operation may be performed. At this time, the injection timings of the main nozzles and the sub-nozzles need to be converted into the spindle angle at the normal operating speed based on the time measured at the slow speed. This conversion is a completely reverse procedure to the conversion described with reference to FIG.

Here, a method of setting the injection start / end timings of the main nozzle 1 and the sub nozzle 16 performed in step 12 will be described. The purpose of setting the injection start / end timings of the main nozzle 1 and the sub-nozzle 16 is to maintain the weft arrival timing at a predetermined value while automatically injecting air from the main nozzle 1 so as to minimize the air injection period. Adjusting the opening / closing timings of the electromagnetic on-off valve 5 for controlling the injection and the electromagnetic on-off valve 19 for controlling the air injection from the sub-nozzle 16, that is, automatically setting the injection timing of the minimum energy that satisfies the arrival timing of the weft. Especially.

That is, at the stage of proceeding to step 11, the relational expression (the delivery characteristic) between the injection pressure P _{m of the} main nozzle and the delivery speed V _cy as shown in FIG. 13, which is the main nozzle characteristic, is determined. This relational expression is expressed as follows. V _cy = F = f (P _m ) Therefore, the delivery speed V _cy is determined by giving the set injection pressure P _m of the main nozzle to the above equation.

Here, FIG. 7 is a flight line diagram of the weft, and the inclination of the straight line determined by the time and the delivery length (distance) represents the delivery speed V _cy , sv _{1 to} sv.
Reference numeral ₅ represents an injection period from the start to the end of injection from each sub-nozzle 16. And t ₁ (open) to t
₅ (open) is the opening timing of the electromagnetic on-off valve 19 that controls the air injection from the sub-nozzle 16, t ₁ (closed) to t ₅ (closed)
Is the closing timing of the solenoid on-off valve 19, L _{1 to} L
₅ (L _n ) is the sub-nozzle 1 which each solenoid valve 19 takes charge of
6 is the head position.

The injection start / end timing of the sub-nozzle 16 is set as follows. That is, the opening timing t _n (open) of the sub-nozzle electromagnetic opening / closing valve 19
(T ₁ (open), t ₂ (open), t ₃ (open), t ₄ (open),
t ₅ (open) is calculated by the following equation.

T _n (open) = (L _n / V _cy −α) + claw removal timing (n = 1 ... k) However, α is also shown in FIG. 7, but the open timing t _n (open)
The timing shift amount is set in consideration of the shift in advance, and a predetermined appropriate value is set. As a matter of course, the timing shift amount α may be obtained by measuring the shift amount that actually occurs and obtaining the average value thereof, or may be updated one after another by learning control.

Next, the closing timing t _n (closed) (t ₁ (closed), t ₂ (closed), t
₃ (closed), t ₄ (closed), t ₅ (closed)) are calculated by the following equations. t _n (closed) = t _n (open) + injection time initial value (n = 1.
· · K) in this manner, is set opening timing t _n of sub-nozzles for solenoid valve 19 and (open) and closing timing t _n (closed), depending on the injection pressure P _m of the main nozzle VARIATION To do. That is, the injection start / end timing of the sub nozzle 16 is set to an appropriate value according to the injection pressure P _m of the main nozzle.

Next, the injection start / end timing of the main nozzle 1 is set as follows. FIG. 8 is a flight line diagram of the weft, and as described in FIG. 7, the inclination of the straight line determined by the time and the delivery length (distance) represents the delivery speed V _cy , and Mv is the main nozzle. The injection period from 1 to the end of injection is shown. Further, T (open) is the opening timing of the electromagnetic opening / closing valve 5 that controls the air injection from the main nozzle 1, and T (closed) is the closing timing of the electromagnetic opening / closing valve 19.

The opening timing T (open) of the main nozzle solenoid on-off valve 5 is calculated by the following equation. T (open) = claw removal timing-β However, β is the initial value of the leading angle, as shown in FIG. Next, the closing timing T of the main nozzle solenoid opening / closing valve 5
(Closed) is calculated by the following equation.

T (closed) = (jet action point / V _cy ) + γ +
Claw removal timing Here, the injection action point is a point to set the delivery length (distance) L that the weft does not drip if only this is ejected. For example, the delivery length (distance) L is empirical. It is _assumed that the distance to _{cy3 in} FIG. 9 is L _cy3 (for two drums).
Also, as shown in FIG. 8, γ is a timing shift amount set in consideration of a shift of the closing timing T (close) in advance, and a predetermined appropriate value is set. Of course, the timing shift amount γ
May be obtained by measuring the amount of deviation that has actually occurred and obtaining it from the average value thereof, or may be updated one after another by learning control.

In this way, the open timing T (open) and the close timing T (close) of the main nozzle solenoid on-off valve 5 are set, and change according to the set injection pressure P _m of the main nozzle. That is, the injection start / end timing of the main nozzle 1 is set to an appropriate value according to the injection pressure P _m of the main nozzle. As described above, as a result of setting the injection start / end timing of the sub nozzle 16 and the main nozzle 1 to an appropriate value according to the injection pressure P _m of the main nozzle, the following effects are obtained.

That is, since the weft flying speed changes depending on the magnitude of the set value of the jet pressure P _m of the main nozzle, the jet start / end timing of the sub nozzle 16 and the main nozzle 1 is set in relation to the delivery speed V _cy. As a result, an appropriate injection timing can be obtained according to the position of the tip of the weft, and a wasteful air injection period is eliminated. Next, a second embodiment of the weft insertion condition setting control of the present invention will be described with reference to the flowchart of FIG. 11 and the characteristic diagrams of FIGS.

In the flowchart of FIG. 11, S31
Then, the input means inputs the initial values such as the target rotation speed N and the weaving width L. In step 32, the main controller 20 calculates the allowable flight time (weft flight possible time) To of the weft and the minimum flight speed V _min (or the minimum unwinding timing cy _min ) from these input data. This allowable flight time To is calculated by the target rotational speed N and the weaving width L, and the minimum flight speed V _min (speed at which the weft insertion travels into the warp shed) is, as shown in FIG. Is a slope of a straight line determined by the feed length, and is calculated from the time and the feed length, and an average value is set. In step 33, a predetermined initial main nozzle injection pressure P
Set _mo and the initial sub-nozzle injection pressure P _so . This setting is calculated from an arbitrarily determined experience value.

At step 34, the following operation is performed.
U When the inching operation is performed, the main controller 20 turns the main shaft of the loom
Even if the speed is slow, it will be performed at the same time as the normal speed.
The operation time of the weft inserting member is calculated and set. For example,
A series of wefts from the main shaft rotation angle of 150 degrees in inching operation
The weft insertion operation is started and weft insertion is performed in the same time as during normal operation.
Complete the work. That is, trigger the spindle rotation angle of 150 degrees
As a key, pull out the weft holding claw, lock it,
Injection start / end and injection start / end of each sub-nozzle 16
Calculate and set the operating time of etc. The movement of this weft insertion member
The work timing is converted by the spindle speed. that's all
After setting the weft insertion conditions as described above, open the inching operation.
Start. This is the weaving mode in step 35.
If it is the weaving mode, step 3
Proceed to 6. In step 36, the spindle is rotated at a slow speed and immediately
During the inching operation, weft insertion conditions such as main
The chewing pressure is changed sequentially (P_m1,P_m2,...),
A predetermined number of picks for each main nozzle jet pressure condition
Shu timing (T _cy1,T_cy2,...) and weft arrival timing
(T_r1,T_r2,...) is measured. This measurement is
For angle measurement by the angle sensor 21 connected to the spindle
Instead, measure in real time.

In step 37, similarly to step 6 in the flow charts of FIGS. 5 and 6 of the first embodiment, it is determined whether or not the sending speed has straightness, that is, whether or not there is speed slump. If the speed is straight, step 3
8. If there is any speed, go to step 39.
In this step 39, the main nozzle injection end timing is delayed and the process returns to step 34 again. Step 3
In _No. 8, the above weft unwinding timing (T _cy1, T _cy2, ...
) And weft arrival timing (T _r1, T _r2, ...) _Are stored.

In step 40, it is determined whether or not the measurement of the predetermined number of picks is completed. If the measurement is completed, the process proceeds to step 41. If the measurement is not completed, the measurement is continued and the process returns to step 38 each time. Store data. It should be noted that the measurement of the predetermined number of picks is performed at the delivery speed (V
_cy1, V _cy2, ...) and weft unwinding timing (T _cy1, T _cy
This is to take the average of _2, ...).

In step 41, the delivery speed (V _cy1, V _cy2, ...) _Is calculated from the stored weft unwinding timing (T _cy1, T _cy2, ...). Based on the delivery speeds (V _cy1, V _cy2, ...) Calculated in this way, the relational expression (delivery characteristics) between the main nozzle injection pressure and the delivery speed is expressed as a straight line expression as shown in FIG. To be done. The main nozzle jet pressure minimum value P _mmin is determined from this relational expression and the calculated minimum weft flying speed V _min . On the other hand, the relational expression between each main nozzle injection pressure and the arrival timing is grasped as shown in FIG. 14, and from this result, the main nozzle injection pressure P _m3 that satisfies the target arrival timing can be calculated.

That is, in step 42, the injection pressure of the main nozzle is changed, and it is judged whether or not the measurement has been completed with the pressure values of at least two conditions. And the change in the arrival timing is calculated. In step 44, the main nozzle injection pressure P _m3 is calculated and set. On the other hand, if the measurement of the two conditions is not completed in step 42, the process proceeds to step 45, and a value obtained by subtracting the minimum flying speed V _min from the delivery speed V _cy is compared with a differential value dv of a predetermined value. If V _cy −V _min > dv, that is, if the delivery speed V _cy is sufficiently higher than the minimum flight speed V _min , the process proceeds to step 46, where the main nozzle injection pressure is reduced to V _cy −V.
_min ≦ dv, that is, the delivery speed V _cy is the minimum flight speed V
When it is not much different from _min , the routine proceeds to step 47, where the main nozzle injection pressure is increased. After steps 46 and 47, the process proceeds to step 36, and the measurements of steps 36 to 45 are repeated.

As described above, the main nozzle injection pressure as the weft inserting condition is automatically set during the inching operation before the operation of the loom. After that, since it is the same as step 13 and subsequent steps shown in the first embodiment, the description thereof will be omitted. In this embodiment, the main nozzle injection pressure is reduced in steps 46 and 47, but instead of this, the main nozzle injection time width (main nozzle injection start timing and injection end timing) may be changed.

In this case, the main nozzle injection pressure is kept constant, and when the main nozzle injection start timing and the injection end timing are changed, the changes in the actual arrival timing and the unwind timing are examined, and the main nozzle injection pressure in step 4 is checked. Instead of calculation, the main nozzle injection timing may be calculated so as to reach the target arrival timing or the target unwind timing. FIG. 15 is a characteristic diagram showing the relationship between the main nozzle injection end timing, the arrival timing, and the unwind timing. In this characteristic diagram, the main nozzle injection start timing is fixed for convenience.

Explaining the third embodiment, if the delivery characteristic is determined as an empirical value, the arrival timing and the release timing when the sub-nozzle injection pressure is sequentially changed are measured and the time difference between the two is measured. The appropriate sub-nozzle injection pressure can be set. FIG. 16 is a flowchart showing the weft-insertion condition setting control described above. From the initial value input in step 51 to the determination as to whether or not the measurement of the predetermined number of picks in step 58 has been completed, it is substantially the same as the flowchart in FIG. is there.

Then, in step 59, it is judged whether or not the measurement of the n condition is completed, and if it is completed, step 60 is executed.
17 to calculate the change in the time difference between the arrival timing and the unwind timing, set the sub-nozzle injection pressure in step 61, and immediately before the start of the time difference change from the relationship between the sub-nozzle injection pressure and the time difference shown in the characteristic diagram of FIG. Select and set the sub nozzle injection pressure.

On the other hand, if it is determined in step 59 that n conditions, for example, the measurement by changing the sub-nozzle injection pressure three times has not been completed, the process proceeds to step 62 to change the sub-nozzle injection pressure to reduce the air consumption, Proceeding to step 56, the measurement of steps 56 to 58 is repeated. This repetition is performed in order to reduce the influence of error by taking an average value for a predetermined number of picks.

As described above, the sub-nozzle injection pressure as the weft inserting condition is automatically set during the inching operation before the loom is operated. The sub-nozzle injection timing can be calculated and set in the same manner instead of the sub-nozzle injection pressure.
In this case, in step 61, the sub-nozzle injection pressure is replaced with the sub-nozzle injection timing, and in step 62, the sub-pressure is replaced with the sub-nozzle injection timing.

Further, in the above embodiment, the arrival timing and the unraveling timing when the sub-nozzle ejection pressure is sequentially changed are measured, and the appropriate sub-nozzle ejection pressure is set from the time difference between the two. However, only the unraveling timing is set. However, the sub-nozzle injection pressure can be set (fourth embodiment). in this case,
The delivery characteristic of the main nozzle 1 is calculated and set by measuring only the unwinding timing, and the arrival timing is estimated from the delivery speed. In this case, the operating condition of the sub nozzle 16 is a value calculated from the operating condition (rotational speed, weaving width, etc.).

Furthermore, the present invention described in each of the above-mentioned embodiments utilizes the weft insertion operation during inching work to measure the weft flying condition due to changes in the weft insertion conditions. It is also possible to measure the weft tension of No. 2 and calculate the tension under the weft inserting condition that satisfies the target arrival timing, and use this as an index for adjustment (fifth embodiment).

In the case of this embodiment, as shown in FIG.
A tension sensor 26 is provided, a signal from the tension sensor 26 is input to the detector 20a, and a means 27 for inputting a weft tension limit value is provided to input the signal to the calculator 20b. Further, each of the above-described embodiments can be implemented in multicolor weft insertion. In this case, when measuring the weft insertion characteristics during inching, the weft insertion characteristics are measured for each color pattern and the weft insertion conditions are set. Alternatively, the weft insertion characteristics are measured while storing the color pattern, and the weft insertion condition is calculated for each color pattern (sixth embodiment).

In the above embodiment, weft insertion conditions such as the minimum injection pressure of the main nozzle, the injection pressure and injection timing of the main nozzle, the injection pressure and injection timing of the sub-nozzle, etc. are individually set as the weft insertion conditions. However, a plurality of weft insertion conditions may be combined and set. According to the above-described embodiment, the weft unwinding timing data is detected while variously changing the injection pressure of the main nozzle 1, and the nozzle characteristics are calculated based on the detected weft unwinding timing data. Since we set the weft insertion conditions based on the nozzle characteristics, we changed the machine,
Especially when changing the yarn type and weaving width, the optimum weft inserting condition can be set, and the optimum weft inserting condition is automatically set. This eliminates the need for repeated weft insertion and stoppage work, greatly reducing the work time and man-hours. In addition, the weft pulling characteristics may vary depending on the storage condition of the yarn and the arrangement of the length measuring device. However, the weft can be reliably reached, and the time until the start of normal operation can be significantly shortened.

In particular, according to the present embodiment, when the machine changing operation is performed, the weft is inserted into the warp opening row by rotating the main shaft at a slow speed to form a woven fabric (which does not become a product). Data is taken using the weaving work that gives an appropriate tension to the warp, so the data taking time can be taken as the weaving work time originally performed when changing the loom,
It is possible to more effectively reduce the time until the regular start of operation, and since the woven fabric originally woven at the time of weaving does not become a product, wasteful woven fabric can be made in addition to this wasteful woven fabric. There is no.

As described above, the present invention has been described with reference to the specific embodiments, but the present invention is not limited to this, and is attached to the present invention by those skilled in the art. It should be noted that various changes and modifications can be made without departing from the scope of the claims.

[0066]

As described above, according to the fluid jet loom of the present invention, the weft unwinding timing data is detected while variously changing the pressure of the air supplied to the nozzle for weft insertion by air jetting. Then, the nozzle characteristic is calculated based on the detected weft unwinding timing data, and the weft inserting condition is set based on the calculated nozzle characteristic. Therefore, the optimum weft inserting condition is automatically set. The working time and man-hours can be greatly reduced, and the weft can fly normally even if the weft pulling characteristics vary depending on the storage condition of the yarn and the arrangement of the length measuring device. Therefore, the time until the start of normal operation can be greatly shortened, and the utility is great.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a fluid jet loom according to the present invention.

FIG. 2 is a system schematic diagram of an embodiment of the above fluid jet loom.

FIG. 3 is a time chart showing air injection from nozzles.

FIG. 4 is a time chart showing the relationship between the output of the angle sensor and the pseudo signal.

FIG. 5 is a flowchart showing control in the first embodiment.

FIG. 6 is a flowchart showing control in the first embodiment.

FIG. 7 is a flight line diagram illustrating the injection timing setting of the sub nozzle.

FIG. 8 is a flight line diagram illustrating setting of injection timing of a main nozzle.

FIG. 9 is a characteristic diagram showing straightness of delivery speed.

FIG. 10 is a characteristic diagram showing a relationship between a time difference between an arrival timing and an unwinding timing and a sub nozzle injection pressure.

FIG. 11 is a flowchart showing control in the second embodiment.

[Figure 12] Flight line diagram

[Fig. 13] Sending characteristic diagram

FIG. 14 is a characteristic diagram showing a relationship between main nozzle injection pressure and arrival timing.

FIG. 15 is a characteristic diagram showing the relationship between the injection timing of the main nozzle and the injection end timing and arrival timing.

FIG. 16 is a flowchart showing control in the third embodiment.

FIG. 17 is a characteristic diagram showing changes in sub-nozzle injection pressure and arrival timing.

FIG. 18 is a system outline diagram showing a fifth embodiment.

[Explanation of symbols]

 1 Main nozzle 5 Electromagnetic on-off valve 16 Sub-nozzle 19 Electromagnetic on-off valve 20 Main controller 20a Detector 20a Detector 20b Arithmetic unit 20c Memory 20d Weft insertion condition commander 21 Angle sensor 22 Weft unwinding sensor 23 Weft arrival sensor 24 Input means 25 Drive circuit Y Weft

[Procedure amendment]

[Submission date] September 24, 1991

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

[Figure 1]

Claims (1)

[Claims] 1. A nozzle for inserting a weft by air jetting, a means for detecting data of the weft unwinding timing while variously changing the pressure of air supplied to the nozzle, and data of the detected weft unwinding timing. A fluid jet loom characterized by including means for calculating nozzle characteristics based on the above, and means for setting weft inserting conditions based on the calculated nozzle characteristics.