阅读说明：本技术 喷气织机的控制装置 (Control device for air jet loom ) 是由 牧野洋一 于 2020-10-29 设计创作，主要内容包括：通过过励磁电压驱动电磁阀,恰当地调整喷嘴的喷射压初始动作特性。具备：控制部(110),其在电磁阀(146)的打开状态下的喷嘴的喷射压初始动作时,向电磁阀(146)供给对喷嘴的喷射压的初始动作特性进行决定的过励磁电压,在喷嘴的喷射压的初始动作时之后,向电磁阀(146)供给对电磁阀(146)的打开状态进行保持的保持电压；和压力检测器(148),其对通过了电磁阀(146)之后的压缩空气的压力进行检测,控制部(110)基于压力检测器(148)的检测结果调整过励磁电压,使初始动作特性成为所希望的状态。(The solenoid valve is driven by the overexcitation voltage to appropriately adjust the initial operating characteristics of the injection pressure of the nozzle. The disclosed device is provided with: a control unit (110) that supplies, to the solenoid valve (146), an overexcitation voltage that determines the initial operating characteristics of the injection pressure of the nozzle during the initial operation of the injection pressure of the nozzle in the open state of the solenoid valve (146), and supplies, to the solenoid valve (146), a holding voltage that holds the open state of the solenoid valve (146) after the initial operation of the injection pressure of the nozzle; and a pressure detector (148) for detecting the pressure of the compressed air after passing through the solenoid valve (146), wherein the control unit (110) adjusts the overexcitation voltage based on the detection result of the pressure detector (148) so that the initial operating characteristics are in a desired state.)

1. A control device for an air jet loom, which controls the running of weft by injecting compressed air from a nozzle in accordance with the opening and closing of an electromagnetic valve, comprising:

a control unit that supplies an overexcitation voltage that determines an initial operation characteristic of the injection pressure of the nozzle to the solenoid valve at an initial operation of the injection pressure of the nozzle in an open state of the solenoid valve, and supplies a holding voltage that holds the open state of the solenoid valve to the solenoid valve after the initial operation of the injection pressure of the nozzle; and

a pressure detector that detects a pressure of the compressed air after passing through the solenoid valve,

the control unit adjusts the overexcitation voltage based on a detection result of the pressure detector.

2. The control device for an air jet loom according to claim 1,

the pressure detector is composed of a pressure switch which is turned on under a predetermined pressure,

an elapsed time from when the overexcitation voltage starts to when the pressure of the compressed air after passing through the solenoid valve reaches a peak is measured, and an initial operating characteristic of the injection pressure of the nozzle is measured based on the elapsed time.

3. The control device for an air jet loom according to claim 1 or 2,

the control unit adjusts the overexcitation voltage and the holding voltage according to a value of current supplied to the solenoid valve.

4. The control device for an air jet loom according to any one of claims 1 to 3,

the electromagnetic valve is a main valve that supplies the compressed air to a main nozzle that inserts the weft yarn to a weft yarn running path by injection of the compressed air.

Technical Field

The present invention relates to a control device for an air jet loom.

Background

The air jet loom is configured to accumulate the weft yarn of the yarn feeding portion in the weft yarn length measuring accumulating portion, to unwind the accumulated weft yarn by the main nozzle to start weft insertion, to convey the weft-inserted weft yarn within a weaving width by the sub-nozzle, and to end weft insertion. Such an air jet loom controls the running of weft yarns by injecting compressed air from a main nozzle and an auxiliary nozzle, so that proper air injection is important. Therefore, it is necessary to appropriately drive the main valve that supplies compressed air to the main nozzle.

In order to properly control the injection pressure initial operation characteristic of the main nozzle for weft insertion, the main valve is driven by an overexcitation voltage equal to or higher than a rated value at the time of the injection pressure initial operation of the main nozzle, and then the main valve is driven by a rated holding voltage so as to maintain a constant pressure. An air jet loom using a main valve as described above is proposed in patent document 1.

Patent document 1: japanese laid-open patent publication No. 6-306739

The high-speed response of the main nozzle for weft insertion, that is, the injection pressure initial operation characteristic, exerts various influences on the weft insertion state of the weft yarn. In the case of a filament yarn or a hard twist yarn, if weft insertion is performed with a jet pressure having a short initial operation time, the weft is easily caught by the warp, and therefore, the initial operation of the main valve is slowed, so that the position of the weft end is stabilized, and a weft error is less likely to occur.

On the other hand, if the overexcitation voltage is adjusted so that the initial operating waveform deformation is slow, the initial operating characteristics of the injection pressure of the main nozzle may vary greatly due to the individual difference of the main valve. Therefore, even when the initial operating waveform is adjusted to be slow by the overexcitation voltage, it is desirable to suppress the inconsistency of the initial operating characteristics.

Disclosure of Invention

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a control device for an air jet loom, which drives a valve by an overexcitation voltage and can appropriately adjust the initial operating characteristics of the injection pressure of a nozzle.

A control device for an air jet loom according to the present invention controls the running of a weft by injecting compressed air from a nozzle in accordance with the opening and closing of an electromagnetic valve, the control device comprising: a control unit that supplies an overexcitation voltage that determines an initial operation characteristic of the injection pressure of the nozzle to the solenoid valve at an initial operation of the injection pressure of the nozzle in an open state of the solenoid valve, and supplies a holding voltage that holds the open state of the solenoid valve to the solenoid valve after the initial operation of the injection pressure of the nozzle; and a pressure detector for detecting the pressure of the compressed air after passing through the solenoid valve, wherein the control unit adjusts the overexcitation voltage based on the detection result of the pressure detector.

The pressure detector is composed of a pressure switch which is turned on at a predetermined pressure, measures an elapsed time from when the overexcitation voltage starts to appear until the pressure of the compressed air after passing through the solenoid valve reaches a peak value, and measures an initial operating characteristic of the injection pressure of the nozzle based on the elapsed time.

The control unit adjusts the overexcitation voltage and the holding voltage according to the value of the current supplied to the solenoid valve.

The solenoid valve is a main valve that supplies compressed air to a main nozzle that inserts a weft yarn to a weft yarn running path by injection of the compressed air.

According to the control device of the air jet loom of the present invention, the valve can be driven by the overexcitation voltage, and the initial operating characteristics of the injection pressure of the nozzle can be appropriately adjusted.

Drawings

Fig. 1 is a block diagram showing a configuration of a weft insertion device of an air jet loom according to embodiment 1 of the present invention.

Fig. 2 is a characteristic diagram showing characteristics of the driving voltage and the pressure of the compressed air in the normal state of the main valve in embodiment 1 of the present invention.

Fig. 3 is a characteristic diagram showing characteristics of the driving voltage and the pressure of the compressed air in the slow state of the main valve according to embodiment 1 of the present invention.

Fig. 4 is a characteristic diagram showing other characteristics of the driving voltage and the pressure of the compressed air in the slow state of the main valve in embodiment 1 of the present invention.

Fig. 5 is an explanatory diagram for explaining an adjustment mode screen in embodiment 1 of the present invention.

Fig. 6 is an explanatory diagram for explaining an adjustment mode screen in embodiment 1 of the present invention.

Fig. 7 is an explanatory diagram for explaining an adjustment mode screen in embodiment 1 of the present invention.

Fig. 8 is an explanatory diagram for explaining an adjustment mode screen in embodiment 1 of the present invention.

Fig. 9 is an explanatory diagram for explaining an adjustment mode screen in embodiment 1 of the present invention.

Fig. 10 is a characteristic diagram showing characteristics in adjusting the slow state of the main valve according to embodiment 1 of the present invention.

Fig. 11 is an explanatory diagram for explaining an adjustment mode screen in embodiment 1 of the present invention.

Fig. 12 is an explanatory diagram for explaining an adjustment mode screen in embodiment 1 of the present invention.

Fig. 13 is a characteristic diagram showing characteristics after adjustment of the slow state of the main valve according to embodiment 1 of the present invention.

Fig. 14 is an explanatory diagram for explaining an adjustment mode screen in embodiment 1 of the present invention.

Fig. 15 is an explanatory diagram for explaining an adjustment mode screen in embodiment 1 of the present invention.

Fig. 16 is an explanatory diagram for explaining an adjustment mode screen in embodiment 1 of the present invention.

Fig. 17 is a characteristic diagram showing characteristics after adjustment of the slow state of the main valve according to embodiment 1 of the present invention.

Detailed Description

Hereinafter, an embodiment of a control device for an air jet loom according to the present invention will be described with reference to the drawings. In the drawings, the same reference numerals are given to the same parts.

Embodiment 1.

First, the configuration of weft insertion device 100 including a control device for an air jet loom according to embodiment 1 of the present invention will be described with reference to fig. 1. Fig. 1 is a block diagram showing a configuration of a weft insertion device 100 of an air jet loom according to embodiment 1 of the present invention. In the present specification, the opposite side to the weft insertion direction is referred to as upstream and the weft insertion direction side is referred to as downstream with respect to the weft insertion direction in which the weft is inserted into the warp opening and conveyed. The source flow side is set as upstream and the opposite side to the source flow is set as downstream with respect to the flow direction of the compressed air.

[ Structure of weft insertion device 100 ]

The weft insertion device 100 shown in fig. 1 includes a control unit 110, a yarn feeder 120, a weft length measuring and accumulating unit 130, a weft insertion nozzle 140, a reed 150, a sub-nozzle 160, and a yarn sensor 170. Here, the control unit 110 constitutes a control device of the air jet loom. The control unit 110 is provided with a CPU111 and a function panel 112. The CPU111 executes various controls of the weft insertion device 100. The function panel 112 has a display function and an input function, displays various information based on contents instructed from the CPU111, and transfers the input information to the CPU 111.

The yarn supplying portion 120 is provided upstream of the weft length measuring and accumulating portion 130, and holds the weft yarn Y. The weft yarn Y of the yarn supplying portion 120 is drawn out by the weft length measuring and accumulating portion 130.

The weft measuring and accumulating section 130 is provided with an accumulating drum 131, a weft locking pin 132, and a balloon sensor 133. The accumulating drum 131 draws out the weft yarn Y of the yarn supplying portion 120 and accumulates the weft yarn Y in a wound state. The weft yarn locking pin 132 and the air ring sensor 133 are disposed around the accumulating drum 131. The weft yarn locking pin 132 is arranged in parallel with the accumulating drum 131 in the unwinding direction of the weft yarn Y.

The weft yarn catching pin 132 unwinds the weft yarn Y accumulated in the accumulation drum 131 at a loom rotation angle preset by the control unit 110. The timing at which the weft yarn Y is unwound by the weft yarn locking pin 132 is the weft insertion start timing.

The weft yarn locking pin 132 detects the weft yarn Y unwound from the accumulating drum 131 during weft insertion, and transmits a weft unwinding signal to the control section 110. When receiving the weft unwinding signal a predetermined number of times (three times in the present embodiment), the control section 110 activates the weft yarn locking pin 132. The weft yarn locking pin 132 locks the weft yarn Y unwound from the accumulating drum 131 and ends weft insertion.

The operating time of the weft yarn locking pin 132 for locking the weft yarn Y is set according to the number of winding turns required to store the weft yarn Y having a length corresponding to the knitting width TL in the storage drum 131. In the present embodiment, since the length of the weft yarn Y wound around the accumulating drum 131 for three turns corresponds to the knitting width TL, the control unit 110 is set to transmit an operation signal for locking the weft yarn Y to the weft yarn locking pin 132 when receiving a weft unwinding signal of the weft yarn locking pin 132 three times. The weft detection signal of the weft yarn locking pin 132 is an unwinding signal of the weft yarn Y from the accumulating drum 131, and the control unit 110 recognizes this signal as the weft yarn unwinding timing based on the loom rotation angle signal obtained from the encoder.

The weft insertion nozzle 140 has a tandem nozzle 141 and a main nozzle 142. The tandem nozzle 141 draws out the weft yarn Y of the accumulating drum 131 by jetting compressed air. The main nozzle 142 picks the weft yarn Y to the weft yarn running path 150a of the reed 150 by the jet of compressed air.

A brake 147 for braking the weft Y before the end of weft insertion is provided upstream of the tandem nozzle 141.

The main nozzle 142 is connected to a main valve 146 via a pipe 146a. The main valve 146 is connected to the main tank 144 via a pipe 144 a. Compressed air is supplied to the main nozzle 142 via a main valve 146. A pressure detector 148 is attached to the outlet side of main valve 146 or to a pipe 146a on the outlet side of main valve 146. The pressure detector 148 detects the pressure of the compressed air after the main valve 146 has passed through, and notifies the control unit 110 of the detection result. The pressure detector 148 may be a pressure switch that is turned on at a predetermined pressure. With this pressure switch, the time elapsed from the start of the overexcitation voltage until the pressure of the compressed air passing through main valve 146 reaches the peak value can be measured, and the initial operating characteristics of the pressure can be measured.

The tandem nozzle 141 is connected to a tandem valve 145 through a pipe 145a. The series valve 145 is connected to a main valve 146 and a common main tank 144 via a pipe 144 b. The main tank 144 is supplied with compressed air from a common air compressor provided in the fabric factory via the main regulator 143. In the main tank 144, compressed air supplied from an air compressor and adjusted to a set pressure by the main regulator 143 is stored.

The reed 150 is arranged downstream of the weft insertion nozzle 140, is composed of a plurality of dents, and includes a weft yarn running path 150a. A plurality of nozzles constituting the sub-nozzle 160 and a yarn running sensor 170 are arranged along the weft yarn running path 150a.

The sub-nozzle 160 is arranged along the weft yarn path 150a of the reed 150, and is composed of a plurality of nozzles. For example, the sub-nozzles 160 are divided into 6 groups, and each group includes 4 nozzles. The sub-valves 163 are arranged in 6 pieces corresponding to the sub-nozzles 160 of each group in the sub-nozzles 160, and the sub-nozzles 160 are connected to the sub-valves 163 of each group via pipes 164. The sub-valves 163 of each group are connected to the common sub-tank 162.

The sub tank 162 is connected to the sub regulator 161 via a pipe 161a. The sub-regulator 161 is connected to a pipe 143b connecting the main regulator 143 and the main tank 144 via a pipe 143c. Accordingly, the sub-tank 162 stores compressed air that is adjusted to a set pressure by the sub-regulator 161 via the main regulator 143.

The yarn feeding sensor 170 is disposed downstream of the weft yarn feeding path 150a and downstream of the weaving width TL, and optically detects the arriving weft yarn Y. The yarn feeding sensor 170 transmits a weft detection signal generated by detecting the weft yarn Y to the control unit 110. The weft detection signal from the weft sensor 170 is an arrival signal of the weft Y, and is recognized as the weft insertion end time IE based on the loom rotation angle signal obtained from the encoder in the control unit 110.

The main nozzle 142, the reed 150, and the sub-nozzle 160 are disposed on a sley, not shown, and reciprocally swing in the front-rear direction of the air jet loom. The yarn supplying portion 120, the weft length measuring and storing portion 130, the tandem nozzle 141, and the brake 147 are fixed to a frame of an air jet loom, not shown, or a bracket attached to the floor.

In the above configuration, the main valve 146, the series valve 145, the sub-valve 163, and the brake 147 are controlled by the control unit 110 in operation timing and operation period. Main valve 146, series valve 145, and sub-valve 163 are solenoid valves.

The tandem valve 145 and the main valve 146 are given an operation command signal from the control unit 110 at a timing earlier than the weft insertion start timing at which the weft yarn locking pin 132 operates, and inject compressed air from the main nozzle 142 and the tandem nozzle 141.

The brake 147 outputs an actuation command signal from the control unit 110 at a time earlier than the weft insertion end time IE at which the weft yarn locking pin 132 is actuated to lock the weft yarn Y of the accumulating drum 131. The brake 147 brakes the weft Y that is being run at a high speed to reduce the running speed of the weft Y, and thus alleviates the impact of the weft Y at the weft insertion end time IE.

In the above description, only 1 set of weft insertion device 100 is shown, but a configuration may be adopted in which 2 or more sets of multicolor weft insertion devices are disposed. The concept of the multicolor weft insertion device also includes the case of the weft insertion device 100 in which a plurality of sets of weft yarns Y of the same color are provided.

[ Driving of the Main valve ]

The opening and closing drive of main valve 146 will be described with reference to fig. 2. Fig. 2 is a characteristic diagram showing characteristics of the driving voltage and the pressure of the compressed air in the normal state of main valve 146 according to embodiment 1 of the present invention. In this specification, the "normal state" is used in relation to the initial operation of the injection pressure of the main nozzle 142.

Fig. 2 (a) shows the characteristics of the pressure in the normal state detected by the pressure detector 148 provided on the outlet side of the main valve 146 at the loom rotation angle. Fig. 2 (b) shows the characteristics of the voltage supplied to main valve 146 when main valve 146 is driven in the normal state.

In the region of the initial operation of the injection pressure of the main nozzle 142 in the open state of the main valve 146 in fig. 2 (a), in order to perform control so as to appropriately realize the injection pressure initial operation characteristic of the main nozzle 142, the main valve 146 is driven by an overexcitation voltage equal to or higher than the rated voltage as the driving voltage in fig. 2 (b). That is, at the time of the injection pressure initial operation of the main nozzle 142 with the main valve 146 in the open state, the initial operation characteristic of the injection pressure of the main nozzle 142 is determined by the overexcitation voltage.

Thereafter, in a flat region following the region of the initial operation of the injection pressure of the main nozzle 142 in fig. 2 (a), the injection pressure of the main nozzle 142 is controlled to be constantly maintained, and the main valve 146 is driven to be held in the open state by a rated holding voltage as the driving voltage in fig. 2 (b). After the injection pressure initial operation of main nozzle 142, a holding voltage for holding the open state of main valve 146 is supplied to main valve 146.

Fig. 2 (c) shows a state in which the overexcitation voltage and the holding voltage shown in fig. 2 (b) are realized by the pulse current generated by the control unit 110. The pulse current is realized by pulse width modulation, pulse number modulation, pulse density modulation, or the like. Fig. 2 (c) illustrates a state where the overexcitation voltage and the holding voltage are adjusted according to the value of the current supplied to main valve 146 by pulse density modulation. Control unit 110 adjusts the overexcitation voltage and the holding voltage in accordance with the value of the current supplied to main valve 146 based on pulse density modulation.

Next, the driving of main valve 146 will be described with reference to fig. 3. Fig. 3 is a characteristic diagram showing characteristics of the driving voltage and the pressure of compressed air in the slow state of main valve 146 according to embodiment 1 of the present invention.

Fig. 3 (a) shows the characteristic of the pressure in the slow state detected by a pressure detector 148 provided on the outlet side of the main valve 146 at the loom rotation angle. Fig. 3 (b) shows the characteristics of the voltage supplied to main valve 146 when main valve 146 is driven in the slow state. Here, the slow state means a state in which the initial operation of the injection pressure of the main nozzle for weft insertion becomes gentle compared with the normal state described in fig. 2.

In the region of the initial operation of the injection pressure of the main nozzle 142 in fig. 3 (a), the main valve 146 is driven with an overexcitation voltage equal to or higher than the rated voltage as the driving voltage in fig. 3 (b) in order to appropriately control the initial operation characteristics of the injection pressure of the main nozzle 142 to a slow state. The overexcitation voltage in the slow state shown in fig. 3 (b) is lower than the overexcitation voltage in the normal state shown in fig. 2 (b).

Thereafter, in a flat region after the region of the initial operation of the injection pressure of the main nozzle 142 in fig. 3 (a), control is performed so as to constantly maintain the injection pressure of the main nozzle 142, and the main valve 146 is driven at a rated holding voltage as the driving voltage in fig. 3 (b).

Fig. 3(c) shows a state in which the overexcitation voltage and the holding voltage shown in fig. 3 (b) are realized by the pulse current generated by the control unit 110. Fig. 3(c) illustrates a state where the overexcitation voltage and the holding voltage are adjusted according to the value of the current supplied to main valve 146 by pulse density modulation. Control unit 110 adjusts the overexcitation voltage and the holding voltage in accordance with the value of the current supplied to main valve 146 based on pulse density modulation.

Next, the other states during driving of main valve 146 will be described with reference to fig. 4. Fig. 4 is a characteristic diagram showing other characteristics of the driving voltage of the slow state of main valve 146 and the pressure of the compressed air in main nozzle 142 according to embodiment 1 of the present invention.

In the region of the initial operation of the injection pressure of the main nozzle 142 in fig. 4 (a), not only the original initial operation characteristic (1) but also the initial operation characteristic (2) in which the initial operation is performed faster than the original operation and the initial operation characteristic (3) in which the initial operation is performed slower than the original operation may occur due to the individual difference of the main valve 146. In order to achieve the desired state shown in (1) of fig. 4 (a) with respect to the initial operating characteristics having the inconsistency shown in (2) and (3) of fig. 4 (a), the control unit 110 adjusts the overexcitation voltage as described below based on the detection result of the pressure detector 148.

[ adjustment of the Main valve (1) ]

Adjustment of the driving state of main valve 146 will be described with reference to fig. 5 to 7. Fig. 5 to 7 are explanatory views for explaining the adjustment mode screen in embodiment 1 of the present invention. Fig. 5 shows an adjustment mode screen 112a displayed on function panel 112 when the initial operating characteristics of main valve 146 in the normal state are adjusted.

Fig. 5 shows the initial operating characteristics of the injection pressure of the main nozzle 142 for two main valves 146 of color 1 and color 2: and a state in which the normal state is adjusted. Here, the initial operation time of the injection pressure of the main nozzle 142 is set to 3.0 and 3.0 at the initial value, and the target value of the initial operation time is 3.0 and 3.0.

In the adjustment mode screen 112a of fig. 5, when the operator clicks the adjustment start button of (a), the function panel 112 notifies the control unit 110 of the operation of the operator. Thereby, the control unit 110 starts the adjustment of the normal mode, and the adjustment mode screen 112b as shown in fig. 6 is displayed on the function panel 112. In fig. 6, (b1) shows adjustment, and (b2) shows a measured value. In this case, the measurement value of the initial operation time coincides with the target value, and the adjustment is ended.

When the adjustment of the normal state of main valve 146 is completed, controller 110 displays adjustment mode screen 112c as shown in fig. 7 on function panel 112, where (c1) shows the completion of the adjustment and (c2) shows the set value of the completion of the adjustment.

[ adjustment of the Main valve (2) ]

Adjustment of the driving state of main valve 146 will be described below with reference to fig. 8. Fig. 8 to 9 are explanatory views for explaining the adjustment mode screen in embodiment 1 of the present invention.

Fig. 8 shows adjustment mode screen 112a displayed on function panel 112 when the initial operating characteristic of slow state of main valve 146 is adjusted. Fig. 8 shows the initial operating characteristics of the injection pressure of the main nozzle 142 for two main valves 146 of color 1 and color 2: and a state in which the slow state is adjusted. Here, the initial operation time of the injection pressure of the main nozzle 142 is set to 6.0 and 6.0 at the initial value, and the target value of the initial operation time is 6.0 and 6.0.

In the adjustment mode screen 112a of fig. 8, when the operator clicks the adjustment start button of (a), the function panel 112 notifies the control unit 110 of the operation of the operator. Thereby, the control unit 110 starts the adjustment of the slow mode, and the adjustment mode screen 112b as shown in fig. 9 is displayed on the function panel 112.

In the adjustment mode screen 112b of fig. 9, (b1) shows that adjustment is being performed, and (b2) shows the measurement value. In this case, the initial operation time of the injection pressure of the main nozzle 142 shows the measured value 6.0 for color 1 and the measured value 8.0 for color 2 with respect to the target values 6.0 and 6.0 for color 1 and 2, respectively.

Fig. 10 shows a characteristic diagram corresponding to the measurement values shown in the adjustment mode screen 112b of fig. 9. Fig. 10 is a characteristic diagram showing characteristics during adjustment of slow state of main valve 146 according to embodiment 1 of the present invention. Fig. 10 (a1) shows the pressure characteristics in the slow state of color 1 in fig. 9 in which the measured value matches the target value. On the other hand, (a2) in fig. 10 shows the pressure characteristics in the slow state of color 2 in fig. 9 in which the measured value does not match the target value. In fig. 10 (a2), it is understood that a delay occurs in the initial operation characteristic as compared with fig. 10 (a 1).

In order to set the initial operation characteristics to a desired state with respect to the delay of the initial operation of color 2, the control unit 110 adjusts the overexcitation voltage based on the detection result of the pressure detector 148.

Specifically, the control unit 110 repeatedly adjusts the overexcitation voltage by applying feedback based on the detection result of the pressure detector 148, and sets the initial operation characteristic to a desired state with respect to the delay of the initial operation of the color 2.

In the adjustment mode screen 112c of fig. 11, (c1) indicates that the overexcitation coefficient for color 2 is from 0.5 initial operation to 0.7, and the control unit 110 increases the overexcitation voltage initial operation. As a result, as shown in fig. 11 (c2), the measured value 6.0 for color 1 and the measured value 6.0 for color 2 are realized for the initial operation time of the injection pressure of the main nozzle 142 with respect to the target values 6.0 and 6.0 for color 1 and color 2.

As described above, the control unit 110 ends the adjustment when the measured value of the initial operating time matches the target value. When the adjustment of the slow state of main valve 146 is completed, controller 110 displays function panel 112 on adjustment mode screen 112d as shown in fig. 12, where (d1) shows the completion of the adjustment and (d2) shows the set value of the completion of the adjustment.

The adjusted state of main valve 146 will be described with reference to fig. 13. Fig. 13 is a characteristic diagram showing characteristics after adjustment of the slow state of main valve 146 according to embodiment 1 of the present invention. In the region of the initial operation of the injection pressure of the main nozzle 142 in fig. 13 (a), the initial operation characteristic indicated by the broken line before the adjustment is obtained, and a delay is generated, but the original initial operation characteristic indicated by the solid line is realized after the adjustment.

In order to realize the initial operating characteristic of fig. 13 (a), the overexcitation coefficient shown in fig. 11 and 12 is corrected, and the overexcitation voltage of fig. 13 (b) is set to a higher voltage after adjustment as indicated by the solid line than before adjustment as indicated by the broken line. That is, the control unit 110 adjusts the overexcitation voltage for color 2 based on the detection result of the pressure detector 148 so as to achieve the desired initial operating state indicated by the solid line in fig. 13 (a).

The overexcitation voltage shown in fig. 13 (b) can be realized in accordance with the pulse current generated by the control unit 110, as shown in fig. 13 (c). In this case, in order to adjust the overexcitation voltage to a high voltage, the pulse width or the pulse density of the pulse current in fig. 13 (c) is adjusted to a value higher than the pulse current in the appropriate state in fig. 3 (c). As a result, the injection pressure initial operation characteristic of the main nozzle 142 can be appropriately adjusted.

[ adjustment of the Main valve (3) ]

Adjustment of the driving state of main valve 146 will be described with reference to fig. 14 to 17. Fig. 14 to 16 are explanatory views for explaining the adjustment mode screen in embodiment 1 of the present invention. Fig. 17 is a characteristic diagram showing characteristics after adjustment of the slow state of the main valve according to embodiment 1 of the present invention.

In the adjustment mode screen 112a of fig. 14, (a1) shows that adjustment is being performed, and (a2) shows a measurement value. In this case, the initial operation time of the injection pressure of the main nozzle 142 shows the measured value 6.0 for color 1 and the measured value 5.0 for color 2 with respect to the target values 6.0 and 6.0 for color 1 and 2, respectively. With respect to color 2, it is understood that the initial operating characteristic is ahead of the target with respect to the target value 6.0 and the measured value 5.0.

In order to bring the initial operation characteristics to a desired state with respect to the lead of the initial operation of color 2, the control unit 110 adjusts the overexcitation voltage based on the detection result of the pressure detector 148. Specifically, the control unit 110 repeatedly adjusts the overexcitation voltage by applying feedback based on the detection result of the pressure detector 148, and sets the initial operation characteristic to a desired state with respect to the advancement of the initial operation of the color 2.

In the adjustment mode screen 112b of fig. 15, (b1) indicates that the overexcitation coefficient for color 2 is decreased from 0.5 to 0.4, and the control unit 110 decreases the overexcitation voltage. As a result, as shown in fig. 15 (b2), the measured value 6.0 for color 1 and the measured value 6.0 for color 2 are realized with respect to the target value 6.0 for color 1 and the target value 6.0 for color 2 for the initial operation time of the injection pressure of the main nozzle 142.

As described above, the control unit 110 ends the adjustment by matching the measured value of the initial operation time of the injection pressure of the main nozzle 142 with the target value. When the adjustment of the slow state of main valve 146 is completed, controller 110 causes function panel 112 to display adjustment mode screen 112c as shown in fig. 16, (c1) shows the completion of the adjustment, and (c2) shows the set value of the completion of the adjustment.

The adjusted state of main valve 146 will be described with reference to fig. 17. Fig. 17 is a characteristic diagram showing characteristics after adjustment of the slow state of main valve 146 according to embodiment 1 of the present invention. In the region of the initial operation of the injection pressure of the main nozzle 142 in fig. 17 (a), the initial operation characteristic shown by the broken line before the adjustment and the lead are generated, but the original initial operation characteristic shown by the solid line is realized after the adjustment.

In order to realize the injection pressure initial operation characteristic of the main nozzle 142 of fig. 17 (a), the overexcitation coefficient shown in fig. 15 and 16 is corrected, and the overexcitation voltage of fig. 17 (b) is set to a lower voltage after adjustment shown by a solid line than before adjustment shown by a broken line. That is, the control unit 110 adjusts the overexcitation voltage for color 2 based on the detection result of the pressure detector 148 so as to achieve the desired initial operating state indicated by the solid line in fig. 17 (a).

As shown in fig. 17 (c), the overexcitation voltage of fig. 17 (b) can be realized in accordance with the pulse current generated by the control unit 110. In this case, in order to adjust the overexcitation voltage to a low voltage, the pulse width or the pulse density of the pulse current in fig. 17 (c) is adjusted to a value lower than that of the pulse current in the appropriate state in fig. 3 (c). As a result, the injection pressure initial operation characteristic of the main nozzle 142 can be appropriately adjusted.

[ other embodiments ]

A modification of embodiment 1 of the present invention will be described below. In the above description, the overexcitation voltage of main valve 146 is adjusted in order to adjust the initial operating characteristics of the injection pressure of main nozzle 142. In contrast, embodiment 1 above can be applied to the case where a pressure detector is provided not only for main valve 146 but also for tandem valve 145, and in this case, the injection pressure initial operation characteristic of tandem nozzle 141 can be appropriately adjusted.

In the above specific example, the adjustment of the color 1 and the color 2 was described, but a favorable result was obtained even in the case of a single color. Further, the initial operating characteristics of the injection pressure of the main nozzle 142 are also made uniform among a plurality of air jet looms, so that the quality of the product can be uniformly maintained.

Description of the reference numerals

A weft insertion device; a control portion; a CPU; a functional panel; a yarn feeding portion; a weft length measuring and storing part; storing the drum; a weft yarn catch pin; a balloon sensor; a weft insertion nozzle; a tandem nozzle; a primary nozzle; a main regulator; 143 a-143 c. A main tank; 144 a-144 c.. tubing; a series valve; a tubing; a main valve (solenoid valve); tubing; a brake; a pressure detector; reed; a weft yarn path; a secondary nozzle; a sub-regulator; tubing; a sub-tank; a sub-valve; tubing; a yarn feed sensor; TL.. weave width; weft yarns.