JP2021147715A - Weft brake control device of air jet loom - Google Patents

Abstract

To provide a weft brake control device of an air jet loom, which allows for determination whether or not a brake force upon completion of weft traveling is appropriate.SOLUTION: Weft Y is inserted through a weft traveling passage 150a by air injection from a main nozzle 142 and a sub nozzle group 160 of an air jet loom. The air jet loom has an end sensor 172 that is provided at a selvage on downstream side of the weft traveling passage, a weaving width inside sensor 171 that is provided on the weft traveling passage on upstream side of the position to which a weft tip arrives at a brake timing of a weft brake 147. Standard deviation Tiσ at an intermediate arrival timing of the weft tip detected by the weaving width inside sensor 171 and standard deviation TWσ at a terminal arrival timing of the weft tip detected by the end sensor 172 are calculated. When the ratio or difference between the standard deviation TWσ at the terminal arrival timing TW and the standard deviation Tiσ at the intermediate arrival timing Ti deviates from a set range, it is determined that a brake force of the weft brake is not appropriate.SELECTED DRAWING: Figure 1

Description

The present invention relates to a weft brake control device for an air jet loom, and more particularly to a weft brake control device for an air jet loom provided with a weft brake that brakes the weft at the end of flight of the weft.

In the air-jet loom, the weft of the weft feeding section is stored in the weft measuring storage section, the stored weft is released by the main nozzle, wefting is started, and the weft inserted is conveyed within the weaving width by the sub nozzle. And it is configured to finish the weaving. Here, it is important for weaving a high-quality woven fabric to achieve a good wefting state in which the weft is reached at a predetermined wefting end position at a predetermined timing.

The end of the weft flight in the air jet loom is the end of the weft withdrawal from the weft length measuring storage device, but the weft withdrawal blocking action at the end of the weft withdrawal suddenly stops the flight of the weft running at high speed. This will increase the weft tension. A sharp increase in tension can result in weft breakage. Therefore, a weft brake is used in which the weft is braked to suppress a sudden increase in tension when the wefting is about to end.

Conventionally, in order to appropriately control the weft brake, an end sensor is provided at the downstream end of the weaving width in the weft flight path, and the standard deviation of the end arrival timing of the weft tip detected by the end sensor is calculated. It is proposed in the following Patent Document 1 that when the standard deviation exceeds a predetermined limit value, a warning is issued and the braking force is reduced.

Japanese Unexamined Patent Publication No. 2000-45150

A state of determining whether or not the braking force of the weft brake is appropriate based on the standard deviation TWσ of the end arrival timing TW will be described with reference to FIG. FIG. 14 is a characteristic diagram showing the characteristics of the braking force of the weft brake and the standard deviation TWσ of the end arrival timing TW for different types of wefts. In FIG. 14, the horizontal axis represents the braking force of the weft brake, and the vertical axis represents the standard deviation TWσ of the end arrival timing TW. The horizontal axis shows the relative numerical values of the braking force in 6 steps, and the vertical axis shows the standard deviation TWσ in an angle (°).

When the braking force of the weft A is set to 6, the standard deviation TWσ of the end arrival timing TW is in a state of large change as shown in the state (a2) in FIG. 14, but the braking force is set to 4. Therefore, as shown in the state (a1) in FIG. 14, it is possible to maintain a stable state in which the change in the standard deviation TWσ of the end arrival timing TW is small. As a result, by setting the braking force of the weft A to 4, it becomes possible to weave the woven fabric in a state where the variation is small.

When the weft B having different characteristics from the weft A is used and the braking force is set to 6, the standard deviation TWσ of the end arrival timing TW is in a state of large change as shown in the state (b2) in FIG. Further, by setting the braking force to 4, the value of the standard deviation TWσ of the end arrival timing TW can be made smaller than the state (b2) as shown in the state (b1) in FIG.

However, the value of the standard deviation TWσ of the end arrival timing TW when the braking force of the weft B is set to 4 is a state (a2) in which the braking force is not appropriate for the weft A, as shown in the state (b1) in FIG. Is the same value as. Therefore, if the value of the standard deviation TWσ of the end arrival timing TW is only referred to for the weft B, the braking force of the weft brake is not adjusted appropriately, so the value of the standard deviation TWσ of the end arrival timing TW is large, or the weft. There is a problem that it is not possible to determine whether the value of the standard deviation TWσ of the end arrival timing TW is large due to the characteristic of B.

When the weft C having different characteristics from the weft A is used and the braking force is set to 6, the standard deviation TWσ of the end arrival timing TW is in a state of large change as shown in the state (c2) of FIG. Further, by setting the braking force to 4, the standard deviation TWσ of the end arrival timing TW can be made smaller than the state (c2) as shown in the state (c1) in FIG.

However, the value of the standard deviation TWσ of the end arrival timing TW when the braking force is 6 for the weft C is a state (a1) in which the braking force is appropriate for the weft A, as shown in the state (c2) in FIG. ) Is the same value. Therefore, it may be that the braking force of the weft brake is properly adjusted only by referring to the value of the standard deviation TWσ of the end arrival timing TW for the weft C. There is a problem that it cannot be correctly determined whether the power is not properly adjusted.

That is, it is not possible to determine whether the braking force of the weft brake is appropriate only by the value of the standard deviation TWσ of the end arrival timing TW at a certain time point, and the standard deviation TWσ of the end arrival timing TW while changing the braking force. It was found that it is not possible to judge whether or not the braking force is appropriate without obtaining the overall characteristics of. Therefore, it is desired to appropriately determine the state of the weft brake.

The present disclosure has been made in order to solve the above problems, and it is possible to determine whether or not the braking force of the weft brake at the end of the weft flight is appropriate for the weft brake control of the air jet loom. The purpose is to provide the device.

The weft brake control device of the air jet loom in the present disclosure includes a main nozzle, a sub nozzle, and a weft brake, and an air jet in which the weft is wefted through the weft flight path by air injection from the main nozzle and the sub nozzle. It is a weft brake control device that controls the weft brake of the loom, and the detection signal of the end sensor provided at the weaving end on the downstream side of the weaving width in the weft running path and the center of the weaving width in the weft running path. It is detected by the weaving width sensor with reference to the detection signal of the weaving width sensor provided on the side opposite to the main nozzle and upstream of the position where the weft tip reaches the braking timing of the weft brake. The standard deviation of the intermediate arrival timing of the weft tip and the standard deviation of the end arrival timing of the weft tip detected by the end sensor are calculated, and the ratio or difference between the standard deviation of the end arrival timing and the standard deviation of the intermediate arrival timing. Is out of the set range, it is determined that the braking force of the weft brake is not appropriate.

The weft brake control device of the air jet loom in the present disclosure issues a warning when the ratio or difference between the standard deviation of the end arrival timing and the standard deviation of the intermediate arrival timing is out of the set range.
The weft brake control device of the air jet loom in the present disclosure adjusts the braking force of the weft brake when the ratio or difference between the standard deviation of the end arrival timing and the standard deviation of the intermediate arrival timing is out of the set range.

The weft brake control device of the air jet loom in the present disclosure is a range in which the ratio or difference between the standard deviation of the end arrival timing and the standard deviation of the intermediate arrival timing is smaller than the others depending on the braking force. Adjust the braking force inside.

The weft brake control device of the air jet loom in the present disclosure adjusts the braking force in a region where the change in ratio or difference is smaller than the others and the braking force is not insufficient.

The weft brake control device of the air jet loom in the present disclosure includes the standard deviation of the end arrival timing of the weft tip detected by the end sensor and the weft tip detected by the weaving width sensor during the operation of the air jet loom. Calculate the standard deviation of the intermediate arrival timing.

The weft brake control device of the air jet loom in the present disclosure sets the air jet loom to the adjustment mode, and in the adjustment mode, the standard deviation of the end arrival timing of the weft tip detected by the end sensor and the sensor within the weaving width are used. Calculate the standard deviation of the detected intermediate arrival timing of the weft tip.

The weft brake control device of the air jet loom in the present disclosure calculates the ratio or difference between the standard deviation of the end arrival timing and the standard deviation of the intermediate arrival timing while changing the braking force of the weft brake in the adjustment mode. Alternatively, adjust the braking force to a region where the change in difference is smaller than the others.

According to the weft brake control device of the air jet loom according to this disclosure, whether or not the braking force of the weft brake at the end of the weft flight is appropriate based on the standard deviation of the intermediate arrival timing and the standard deviation of the end arrival timing. Can be determined.

It is a block diagram which shows the structure of the wefting device which includes the brake control device of the air jet loom in Embodiment 1. FIG. It is a characteristic diagram which shows the flight of the weft and each timing in Embodiment 1. FIG. It is a characteristic figure which shows the characteristic of the braking force of the weft brake in Embodiment 1, and the standard deviation of the intermediate arrival timing and the end arrival timing. It is a characteristic figure which shows the characteristic of the braking force of the weft brake in Embodiment 1, and the standard deviation of the intermediate arrival timing and the end arrival timing. It is a characteristic figure which shows the characteristic of the braking force of the weft brake in Embodiment 1, and the standard deviation of the intermediate arrival timing and the end arrival timing. It is explanatory drawing explaining the warning screen in Embodiment 1. FIG. It is a characteristic figure which shows the characteristic of the braking force of the weft brake in Embodiment 1, and the standard deviation of the intermediate arrival timing and the end arrival timing. It is a characteristic figure which shows the characteristic of the braking force of the weft brake in Embodiment 1, and the standard deviation of the intermediate arrival timing and the end arrival timing. It is a characteristic figure which shows the characteristic of the braking force of the weft brake in Embodiment 1, and the standard deviation of the intermediate arrival timing and the end arrival timing. It is a characteristic figure which shows the time-dependent change of the standard deviation of the intermediate arrival timing and the end arrival timing in Embodiment 1. It is a characteristic figure which shows the time-dependent change of the standard deviation of the intermediate arrival timing and the end arrival timing in Embodiment 1. It is a characteristic figure which shows the time-dependent change of the standard deviation of the intermediate arrival timing and the end arrival timing in Embodiment 1. It is a characteristic figure which shows the time-dependent change of the standard deviation of the intermediate arrival timing and the end arrival timing in Embodiment 1. It is a characteristic figure which shows the characteristic of the braking force of the weft brake and the standard deviation of the end arrival timing for different kinds of yarns.

Hereinafter, embodiments of the weft brake control device of the air jet loom according to the present disclosure will be described with reference to the drawings. In each figure, the same parts are designated by the same reference numerals.

Embodiment 1.
First, the configuration of the wefting device 100 including the weft brake control device of the air jet loom according to the first embodiment will be described with reference to FIG. FIG. 1 is a block diagram showing a configuration of a wefting device 100 including a brake control device for an air jet loom according to the first embodiment. In the present specification, the weft is wefted into the warp opening, and the side opposite to the wefting direction is upstream and the wefting direction side is downstream with respect to the wefting direction in which the weft is conveyed. Further, the source side is upstream and the opposite side to the source is downstream with respect to the direction in which the compressed air flows.

[Structure of Wefting Device 100]
The wefting device 100 shown in FIG. 1 mainly includes a control unit 110, a yarn feeding unit 120, a weft length measuring storage unit 130, a wefting nozzle 140, a reed 150, a plurality of sub-nozzle groups 160, and a flight sensor unit 170. To be equipped with.

The control unit 110 that functions as a weft brake control device is provided with a CPU 111 and a function panel 112. The CPU 111 executes various controls including weft flight control and weft brake control by controlling the injection timing of compressed air. The function panel 112 is a notification unit that notifies various states of the weft brake control, has a display function and an input function, displays various information based on the contents instructed by the CPU 111, and transmits the input information to the CPU 111. introduce.

The yarn feeding unit 120 is provided on the upstream side of the weft length measuring storage unit 130 and holds the weft Y. The weft Y of the yarn feeding section 120 is pulled out by the weft measuring storage section 130.

The weft length measuring storage unit 130 is provided with a storage drum 131, a weft locking pin 132, and a balloon sensor 133. The storage drum 131 pulls out the weft Y of the thread feeding unit 120 and stores it in a wound state. The weft locking pin 132 and the balloon sensor 133 are arranged around the storage drum 131. The balloon sensors 133 are arranged side by side with respect to the weft locking pin 132 on the release direction side of the weft Y.

The weft locking pin 132 releases the weft Y stored in the storage drum 131 at a loom rotation angle preset in the control unit 110. The timing at which the weft Y is released by the weft locking pin 132 is the weft insertion start timing.

The balloon sensor 133 detects the weft thread Y released from the storage drum 131 during wefting, and transmits a weft thread release signal to the control unit 110. When the control unit 110 receives the weft release signal a preset number of times (three times in this embodiment), the control unit 110 operates the weft locking pin 132. The weft locking pin 132 locks the weft Y released from the storage drum 131 and ends the weft insertion.

The operation timing for the weft locking pin 132 to lock the weft Y is set according to the number of windings required to store the weft Y having a length corresponding to the weaving width TL in the storage drum 131. In the present embodiment, since the length of the weft Y wound three times around the storage drum 131 corresponds to the weaving width TL, the control unit 110 locks the weft Y when the weft release signal of the balloon sensor 133 is received three times. The operation signal is set to be transmitted to the weft locking pin 132. The weft detection signal of the balloon sensor 133 is a release signal of the weft Y from the storage drum 131, and is recognized by the control unit 110 as the weft release timing based on the loom rotation angle signal obtained from the encoder.

The weaving nozzle 140 has a tandem nozzle 141 and a main nozzle 142. The tandem nozzle 141 draws out the weft Y of the storage drum 131 by injecting compressed air. The main nozzle 142 wefts the weft Y into the weft flight path 150a of the reed 150 by injecting compressed air.

A weft brake 147 is provided on the upstream side of the tandem nozzle 141 to brake the flying weft Y before the wefting is completed.

The main nozzle 142 is connected to the main valve 146 via a pipe 146a. The main valve 146 is connected to the main tank 144 via the pipe 144a.

The tandem nozzle 141 is connected to the tandem valve 145 via the pipe 145a. The tandem valve 145 is connected to the main tank 144 common to the main valve 146 via a pipe 144b. In the main tank 144, compressed air supplied from the air supply source 149 to the main regulator 143 via the pipe 143a is adjusted to a set pressure by the main regulator 143 and stored.

The reed 150 is arranged on the downstream side of the weft nozzle 140, is composed of a plurality of reed wings, and includes a weft flight path 150a. A plurality of sub-nozzle groups 160 and a flight sensor unit 170 are arranged along the weft flight path 150a.

The plurality of sub-nozzle groups 160 are arranged along the weft flight path 150a of the reed 150. The plurality of sub-nozzle groups 160 are divided into 6 groups as an example, and each sub-nozzle group 160A to 160F is composed of 4 sub-nozzles for each group. Each of the sub-nozzle groups 160A to 160F is connected to a plurality of sub-valves 163 for each group via a plurality of piping groups 164. The plurality of pipe groups 164 are divided into 6 groups corresponding to the plurality of sub-nozzle groups 160, and each of the pipe groups 164A to 164F is composed of four pipes for each group. The plurality of sub-valves 163 are composed of sub-valves 163A to 163F according to the respective piping groups 164A to 164F, and are connected to a common sub-tank 162.

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

The flight sensor unit 170 includes a weaving width sensor 171 and an end sensor 172. The weaving width sensor 171 is arranged on the upstream side of the end sensor 172 and on the side opposite to the main nozzle 142 from the center of the weaving width TL in the weft flight path 150a. Further, the weaving width sensor 171 is arranged on the upstream side of the position where the weft tip reaches the braking timing of the weft brake 147, and optically detects the reached weft Y. The weaving width sensor 171 detects the weft Y and transmits the generated weft detection signal to the control unit 110.
The weft detection signal by the weaving width sensor 171 is recognized by the control unit 110 as the intermediate arrival timing Ti based on the loom rotation angle signal obtained from the encoder. Intermediate arrival timing Ti This is the timing when the tip of the weft Y weft reaches the installation position of the sensor 171 in the weaving width.

The end sensor 172 is arranged at the weaving end on the downstream side of the weft flight path 150a and on the downstream side of the weaving width TL, and optically detects the reached weft Y. The end sensor 172 transmits the weft detection signal generated by detecting the weft Y to the control unit 110. The weft detection signal by the end sensor 172 is the arrival signal of the weft Y, and is recognized by the control unit 110 as the end arrival timing TW based on the loom rotation angle signal obtained from the encoder.

The main nozzle 142, the reed 150, and the plurality of sub-nozzle groups 160 are arranged on a sley (not shown) and reciprocally swing in the front-rear direction of the air jet loom. Further, the yarn feeding unit 120, the weft length measuring storage unit 130, the tandem nozzle 141, and the weft brake 147 are fixed to a bracket attached to a frame or a floor surface of an air jet loom (not shown).

In the above configuration, the operation timing and operation period of the main valve 146, the tandem valve 145, the plurality of sub valves 163, and the weft brake 147 are controlled by the control unit 110. In the tandem valve 145 and the main valve 146, an operation command signal is given from the control unit 110 at a timing earlier than the weft insertion start timing at which the weft locking pin 132 operates, and compressed air is injected from the main nozzle 142 and the tandem nozzle 141. NS. The weft brake 147 outputs an operation command signal from the control unit 110 at a time earlier than the weft insertion end timing at which the weft locking pin 132 operates to lock the weft Y of the storage drum 131. The weft brake 147 brakes the weft Y flying at high speed to reduce the flying speed of the weft Y, and alleviates the impact of the weft Y at the end arrival timing TW.

[Weft flight and timing]
With reference to FIG. 2, the flight of the weft thread inserted through the weft flight path by air injection and each timing will be described. FIG. 2 is a characteristic diagram showing the flight of the weft and each timing in the first embodiment. In FIG. 2, the horizontal axis represents the machine base rotation angle, the vertical axis represents the wefting direction position in the weaving width TL, and represents the flight curve of the weft Y. The flight curve of FIG. 2 shows the flight state in which the weft Y is actually measured by a stroboscope. In this flight curve, the weft brake 147 operates between the position of the weaving width sensor 171 and the position of the end sensor 172, and after the brake operation, the speed of the weft Y decreases and the inclination becomes gentle. ing.

[Control of weft brake control device]
Here, the control of the weft brake 147 by the weft brake control device according to the first embodiment will be described.
The control unit 110 as the weft brake control device stores the intermediate arrival timing Ti from the weft detection signal detected by the weaving width sensor 171 based on the machine base rotation angle, and the weft from a plurality of intermediate arrival timing Tis. Calculate the standard deviation Tiσ of the intermediate arrival timing Ti of the tip. Similarly, the control unit 110 stores the end arrival timing TW from the weft detection signal that the end sensor 172 detects the weft based on the machine base rotation angle, and the terminal arrival timing of the weft tip from the plurality of end arrival timing TWs. Calculate the standard deviation TWσ of TW.

The control unit 110 issues a warning about weft brake control when the ratio or difference between the standard deviation TWσ of the end arrival timing TW and the standard deviation Tiσ of the intermediate arrival timing Ti is out of the set range. Further, the control unit 110 adjusts the braking force of the weft brake 147 when the ratio or difference between the standard deviation TWσ of the end arrival timing TW and the standard deviation Tiσ of the intermediate arrival timing Ti is out of the set range. Then, the control unit 110 has a range in which the ratio or difference between the standard deviation TWσ of the terminal arrival timing TW and the standard deviation Tiσ of the intermediate arrival timing Ti is smaller than the other regions in terms of the ratio or difference change according to the braking force. Inside, the braking force of the weft brake 147 is adjusted.

[Specific example of weft brake control (judgment)]
Next, a specific example of the weft brake control according to the first embodiment will be described with reference to FIGS. 3 to 5. 3 to 5 show the characteristics of the wefts A to C having different characteristics with the braking force of the weft brake 147 in the first embodiment and the standard deviations Tiσ and TWσ of the intermediate arrival timing Ti and the end arrival timing TW. It is a figure.

Here, in FIGS. 3 to 5, the horizontal axis represents the braking force of the weft brake 147, and the vertical axis represents the standard deviation Tiσ of the intermediate arrival timing Ti and the standard deviation TWσ of the end arrival timing TW. The horizontal axis shows the relative numerical values of the braking force in 6 stages, and the vertical axis shows the standard deviations TWσ and Tiσ in angles (°). Further, regarding the control of the braking force of the weft brake 147, the operating force of the weft brake 147 per unit time may be adjusted, or the operating time of the constant operating force may be adjusted.

In FIGS. 3 to 5, since the intermediate arrival timing Ti is the timing upstream of the operation timing of the weft brake 147, the standard deviation Tiσ of the intermediate arrival timing Ti is the standard deviation of the end arrival timing TW regardless of the braking force. Compared to TWσ, the change is small.

On the other hand, in FIGS. 3 to 5, the end arrival timing TW is a timing downstream of the operation timing of the weft brake 147. When the braking force of the weft brake 147 becomes large, the pressure of the compressed air injected from the main nozzle 142 is controlled to increase, and the standard deviation TWσ of the end arrival timing TW is compared with the standard deviation Tiσ of the intermediate arrival timing Ti. The value varies greatly depending on the braking force. Further, in FIGS. 3 to 5, the values of the standard deviation Tiσ of the intermediate arrival timing Ti and the standard deviation TWσ of the end arrival timing TW are different depending on the difference in the characteristics of the weft threads A to C.

Hereinafter, braking of the weft brake of the weft A will be described with reference to FIG. FIG. 3 shows the characteristics of the weft A, the braking force of the weft brake 147, the standard deviation Tiσ of the intermediate arrival timing Ti, and the standard deviation TWσ of the end arrival timing TW.

When the braking force = 6 in FIG. 3, the standard deviation Tiσ of the intermediate arrival timing Ti shown in the state (a02) is 2.5, and the standard deviation TWσ of the end arrival timing TW shown in the state (a2) is 6.1. ing. The state (a2) in FIG. 3 is the same as the state (a2) shown in FIG.

Here, it is assumed that the ratio of the standard deviation TWσ of the end arrival timing TW and the standard deviation Tiσ of the intermediate arrival timing Ti is set to less than 2.0 as the normal setting range. In the case shown in FIG. 3, when the braking force = 6, the control unit 110 calculates TWσ (a2) / Tiσ (a02) = 6.1 / 2.5 = 2.4, and the braking force of the weft brake 147 is set. Judges that it is out of range and issues a warning.

Specifically, the control unit 110 detects by the weaving width sensor 171 at the timing when the weaving device 100 weaves the woven fabric or at the timing when the weaving device 100 automatically adjusts at the time of activation or the like. The standard deviation Tiσ of the intermediate arrival timing Ti of the weft Y tip and the standard deviation TWσ of the end arrival timing TW of the weft Y tip detected by the end sensor 172 are calculated and intermediate with the standard deviation TWσ of the end arrival timing TW. When the ratio or difference of the arrival timing Ti with the standard deviation Tiσ is out of the above set range, it is determined that the braking force of the weft brake 147 is not appropriate, and a warning is issued.

When the braking force = 4 in FIG. 3, the standard deviation Tiσ of the intermediate arrival timing Ti shown in the state (a01) is 2.2, and the standard deviation TWσ of the end arrival timing TW shown in the state (a1) is 4.0. ing. The state (a1) in FIG. 3 is the same as the state (a1) shown in FIG. That is, when the control unit 110 determines by the ratio of the standard deviation TWσ of the terminal arrival timing TW and the standard deviation Tiσ of the intermediate arrival timing Ti, TWσ (a1) / Tiσ (a01) = 4. It is calculated as 0 / 2.2 = 1.8, it is determined that the braking force of the weft brake 147 is within the set range, and no warning is issued.

Hereinafter, braking of the weft brake of the weft B will be described with reference to FIG. FIG. 4 shows the characteristics of the weft B, the braking force of the weft brake 147, the standard deviation Tiσ of the intermediate arrival timing Ti, and the standard deviation TWσ of the end arrival timing TW.

When the braking force = 6 in FIG. 4, the standard deviation Tiσ of the intermediate arrival timing Ti shown in the state (b02) is 3.5, and the standard deviation TWσ of the end arrival timing TW shown in the state (b2) is 9.1. ing. The state (b2) in FIG. 4 is the same as the state (b2) shown in FIG.

Here, it is assumed that the ratio of the standard deviation TWσ of the end arrival timing TW and the standard deviation Tiσ of the intermediate arrival timing Ti is set to less than 2.0 as the normal setting range. In the case shown in FIG. 4, when the braking force = 6, the control unit 110 calculates TWσ (b2) / Tiσ (b02) = 9.1 / 3.5 = 2.6, and the braking force of the weft brake 147 is set. Judges that it is out of range and issues a warning.

Specifically, the control unit 110 detects by the weaving width sensor 171 at the timing when the weaving device 100 weaves the woven fabric or at the timing when the weaving device 100 automatically adjusts at the time of activation or the like. The standard deviation Tiσ of the intermediate arrival timing Ti of the weft Y tip and the standard deviation TWσ of the end arrival timing TW of the weft Y tip detected by the end sensor 172 are calculated and intermediate with the standard deviation TWσ of the end arrival timing TW. When the ratio of the arrival timing Ti to the standard deviation Tiσ is out of the above setting range, it is determined that the braking force of the weft brake 147 is not appropriate, and a warning is issued.

When the braking force = 4 in FIG. 4, the standard deviation Tiσ of the intermediate arrival timing Ti shown in the state (b01) is 3.2, and the standard deviation TWσ of the end arrival timing TW shown in the state (b1) is 6.0. ing. The state (b1) in FIG. 4 is the same as the state (b1) shown in FIG. That is, the control unit 110 calculates TWσ (b1) / Tiσ (b01) = 6.0 / 3.2 = 1.9 at braking force = 4, and determines that the braking force of the weft brake 147 is within the set range. And does not issue a warning.

Hereinafter, braking of the weft brake of the weft C will be described with reference to FIG. FIG. 5 shows the characteristics of the weft C, the braking force of the weft brake 147, the standard deviation Tiσ of the intermediate arrival timing Ti, and the standard deviation TWσ of the end arrival timing TW.

When the braking force = 6 in FIG. 5, the standard deviation Tiσ of the intermediate arrival timing Ti shown in the state (c02) is 1.3, and the standard deviation TWσ of the end arrival timing TW shown in the state (c2) is 3.7. ing. The state (c2) in FIG. 5 is the same as the state (c2) shown in FIG.

Here, it is assumed that the ratio of the standard deviation TWσ of the end arrival timing TW and the standard deviation Tiσ of the intermediate arrival timing Ti is set to less than 2.0 as the normal setting range. In the case shown in FIG. 5, when the braking force = 6, the control unit 110 calculates TWσ (c2) / Tiσ (c02) = 3.7 / 1.3 = 2.8, and the braking force of the weft brake 147 is set. Judges that it is out of range and issues a warning.

Specifically, the control unit 110 detects by the weaving width sensor 171 at the timing when the weaving device 100 weaves the woven fabric or at the timing when the weaving device 100 automatically adjusts at the time of activation or the like. The standard deviation Tiσ of the intermediate arrival timing Ti of the weft Y tip and the standard deviation TWσ of the end arrival timing TW of the weft Y tip detected by the end sensor 172 are calculated and intermediate with the standard deviation TWσ of the end arrival timing TW. When the ratio of the arrival timing Ti to the standard deviation Tiσ is out of the above setting range, it is determined that the braking force of the weft brake 147 is not appropriate, and a warning is issued.

When the braking force = 4 in FIG. 5, the standard deviation Tiσ of the intermediate arrival timing Ti shown in the state (c01) is 2.0, and the standard deviation TWσ of the end arrival timing TW shown in the state (c1) is 1.3. ing. The state (c1) in FIG. 5 is the same as the state (c1) shown in FIG. That is, when the braking force = 4, the control unit 110 calculates TWσ (c1) / Tiσ (c01) = 2.0 / 1.3 = 1.5, and determines that the braking force of the weft brake 147 is within the set range. And does not issue a warning.

In FIGS. 3 to 5 above, when the braking force = 1 to 2, the ratio of the standard deviation Tiσ of the intermediate arrival timing Ti and the standard deviation TWσ of the terminal arrival timing TW satisfies less than 2.0. A separate inspection of the finished woven fabric revealed that the woven fabric had the drawback of loosening as the braking force decreased. Therefore, in FIGS. 3 to 5 above, the control unit 110 sets the braking force of the weft brake 147 of the weft device 100 to 3 to 4, so that appropriate braking is applied at the end of the weft running. Can be done.

In the above description, since both the standard deviation Tiσ of the intermediate arrival timing Ti and the standard deviation TWσ of the end arrival timing TW are referred to, it is possible to instantly determine whether the braking force of the weft brake 147 is appropriate without being affected by the characteristics of the weft. Can be determined.

In the above description, the ratio of the standard deviation TWσ of the end arrival timing TW to the standard deviation Tiσ of the intermediate arrival timing Ti is defined as a normal setting range, but this value is an example and is arbitrary. Can be set to the value of.

Further, it is also possible to set not only the upper limit value but also the lower limit value in the normal setting range of the ratio of the standard deviation TWσ of the terminal arrival timing TW and the standard deviation Tiσ of the intermediate arrival timing Ti. For example, the lower limit of the normal setting range is set to 1.2, and the ratio of the standard deviation TWσ of the end arrival timing TW and the standard deviation Tiσ of the intermediate arrival timing Ti is 1.2 or more and less than 2.0, which is the normal setting range. It is also possible to specify. In this case, if the ratio of the standard deviation TWσ of the end arrival timing TW and the standard deviation Tiσ of the intermediate arrival timing Ti is less than 1.2, the control unit 110 deviates from the set range of the braking force of the weft brake 147. Judges that there is, and issues a warning.

In the above description, it is explained that the control unit 110 issues a warning when the ratio of the standard deviation Tiσ of the intermediate arrival timing Ti and the standard deviation TWσ of the terminal arrival timing TW is out of the setting range of 1.2 to 2.0. However, it is not limited to this. For example, the configuration may be such that a warning is issued when the difference between the standard deviation TWσ of the terminal arrival timing TW and the standard deviation Tiσ of the intermediate arrival timing Ti is out of a predetermined setting range. When the determination is made based on the difference, it may be determined that the setting range is out of the range when the determination formula of TWσ> a × Tiσ is satisfied with a as a coefficient. As an example, when TWσ> 2 × Tiσ is satisfied, it is determined that the setting range is out of range.
Further, when b is set as a constant and the determination formula of TWσ> Tiσ + b is satisfied, it may be determined that the setting range is out of range. Further, it may be determined that the set range is out of the range when the determination formula of TWσ> a × Tiσ + b is satisfied. Here, a and b can be arbitrarily determined, and the magnitude relationship can also be arbitrarily determined.

[Specific example of weft brake control (warning)]
When the control unit 110 determines that the braking force of the weaver brake 147 is out of the set range as shown in FIGS. 3 to 5 at the timing when the weaver 100 is weaving the woven fabric, the control unit 110 By displaying the warning screen 112G shown in FIG. 6 on the function panel 112, a warning can be issued to the manager or the weaver.

FIG. 6 is an explanatory diagram illustrating the warning screen 112G according to the first embodiment. In the warning screen shown in 112G of FIG. 6, the ratio of the standard deviation TWσ of the end arrival timing TW and the standard deviation Tiσ of the intermediate arrival timing Ti is 2 in the setting range when the braking force in FIGS. 3 and 4 is 6. If it exceeds .0, the control unit 110 determines that the braking force of the weft brake 147 is too strong, and displays the message "The weft brake may be stronger than the set value. Do you want to adjust the brake?" doing.

When the administrator or the weaver clicks the [YES] tab 112Ga on the warning screen 112G of the function panel 112 of FIG. 6, the control unit 110 controls the standard deviation TWσ of the end arrival timing TW and the standard deviation of the intermediate arrival timing Ti. The braking force of the weaver brake 147 is adjusted so that the ratio or difference with Tiσ falls within the set range. When adjusting the braking force of the weft brake 147, the control unit 110 needs to display on the function panel 112 that the braking force of the weft brake 147 is being adjusted or the result of adjusting the braking force of the weft brake 147. Do according to.

On the other hand, when the administrator or the weaver clicks the [NO] tab 112Gb on the warning screen 112G of the function panel 112 of FIG. 6, the control unit 110 does not adjust the braking force of the weft brake 147, and the warning screen End the warning by 112G.

[Specific example of weft brake control (automatic adjustment)]
When the [YES] tab 112Ga of the warning screen 112G of FIG. 6 is clicked, or while automatic adjustment such as when the wefting device 100 is started is being executed, the control unit 110 sets the weft brake 147 as follows. Performs automatic adjustment of braking force.

Hereinafter, the automatic adjustment of the braking force of the weft brake 147 will be described with reference to FIGS. 7 to 9. 7 to 9 are characteristic diagrams showing the characteristics of the braking force of the weft brake 147 in the first embodiment and the standard deviations Tiσ and TWσ of the intermediate arrival timing Ti and the end arrival timing TW.

First, the control unit 110 sets the wefting device 100 to the adjustment mode as an automatic adjustment of the braking force of the weft brake 147. Then, as shown in FIG. 7, the control unit 110 adjusts the braking force at one end of the adjusting range, for example, at braking force = 6, the standard deviation of the end arrival timing TW TWσ = 6.1, and the standard deviation of the intermediate arrival timing Ti. It is calculated that Tiσ = 2.4 and TWσ / Tiσ = 2.5.

The control unit 110 continues to automatically adjust the braking force of the weft brake 147, and as shown in FIG. 8, at braking force = 5, the standard deviation TWσ = 4.5 of the end arrival timing TW and the standard of the intermediate arrival timing Ti at the braking force = 5. The deviation Tiσ = 2.3 and TWσ / Tiσ = 1.9 are calculated.

The control unit 110 continues the automatic adjustment of the braking force of the weft brake 147, and as shown in FIG. 9, at the braking force = 4, TWσ = 4.0, Tiσ = 2.2, and TWσ / Tiσ = 1. It is calculated as 0.8, and when the braking force is 3, TWσ = 4.1, Tiσ = 2.3, and TWσ / Tiσ = 1.8.

When the braking force = 4 and the braking force = 3, the control unit 110 has a small change between the standard deviation Tiσ of the intermediate arrival timing Ti and the standard deviation TWσ of the terminal arrival timing TW as compared with the braking force = 6 to 5, and is flat. The braking force of the weft brake 147 is adjusted to 4, and the measurement and adjustment are completed.

In the above description, the change in the ratio between the standard deviation Tiσ of the intermediate arrival timing Ti and the standard deviation TWσ of the end arrival timing TW becomes smaller and flatter than in other regions regardless of the change in braking force. The measurement has been completed, but the measurement is not limited to this. For example, the measurement may be terminated when the ratio of the standard deviation TWσ of the end arrival timing TW and the standard deviation Tiσ of the intermediate arrival timing Ti reaches the lower limit value of the predetermined normal setting range. Further, regarding the difference between the standard deviation TWσ of the end arrival timing TW and the standard deviation Tiσ of the intermediate arrival timing Ti, the change in the difference is smaller and flatter than in other regions regardless of the change in the braking force, or in advance. When the lower limit of the set setting range is reached, the measurement may be terminated.

Further, the control unit 110 automatically adjusts the braking force of the weft brake 147 in the reverse order of measuring while reducing the braking force as shown in FIGS. 7 to 9, braking force = 1, 2, 3. The measurement may be performed while increasing the braking force as in ,. In this case, the measurement may be completed for the ratio or difference between the standard deviation TWσ of the terminal arrival timing TW and the standard deviation Tiσ of the intermediate arrival timing Ti. For example, the ratio of the standard deviation TWσ of the terminal arrival timing TW to the standard deviation Tiσ of the intermediate arrival timing Ti reaches the upper limit of a predetermined normal setting range, for example, when TWσ / Tiσ = 2.0 is reached, or , The measurement may be terminated when the upper limit value is exceeded.

[Specific example of weft brake control (change over time)]
Next, with reference to FIGS. 10 to 13, a specific example of the change with time of the weft brake control in the first embodiment will be described. 10 to 13 are characteristic diagrams showing changes over time in the standard deviations of the intermediate arrival timing and the terminal arrival timing in the first embodiment.

If the braking force of the weft brake 147 increases for some reason while the wefting device 100 is operating, as shown in FIG. 10, the standard deviation Tiσ of the intermediate arrival timing Ti remains constant and the standard deviation of the end arrival timing TW. TWσ may be larger than before. In the state (a) of FIG. 10, as TWσ increases, TWσ / Tiσ> 2.0, which is out of the predetermined normal setting range, so that the control unit 110 issues a warning. Although the example of detecting the change with time by the ratio of TWσ and Tiσ will be described here, it is also possible to detect the change with time by the difference between TWσ and Tiσ.

When the weft characteristics change for some reason while the wefting device 100 is operating, both the standard deviation TWσ of the end arrival timing TW and the standard deviation Tiσ of the intermediate arrival timing Ti are linked as shown in FIG. It may be larger than before. In the state (b1) and the state (b2) of FIG. 11, the standard deviation Tiσ of the intermediate arrival timing Ti and the standard deviation TWσ of the terminal arrival timing TW are larger than before, but TWσ / Tiσ ≦ 2.0 remains. If so, the control unit 110 does not issue a warning.

If the braking force of the weft brake 147 decreases for some reason while the wefting device 100 is operating, as shown in FIG. 12, the standard deviation Tiσ of the intermediate arrival timing Ti remains constant and the standard deviation of the end arrival timing TW. TWσ may be smaller than before. In the state (c) of FIG. 12, as the standard deviation TWσ of the end arrival timing TW decreases, TWσ / Tiσ <1.2, which deviates from the predetermined normal setting range, and therefore the control unit 110 issues a warning. .. In this state, loosening is likely to occur in the lateral direction as the braking force decreases.

If the weft characteristics change for some reason while the wefting device 100 is operating, as shown in FIG. 13, both the standard deviation TWσ of the end arrival timing TW and the standard deviation Tiσ of the intermediate arrival timing Ti are interlocked. And it may be smaller than before. In the states (d1) and (d2) of FIG. 13, the standard deviation TWσ of the terminal arrival timing TW and the standard deviation Tiσ of the intermediate arrival timing Ti are reduced, but the TWσ / Tiσ ≧ 1.2 should be maintained. For example, the control unit 110 does not issue a warning.

[Effects obtained by the embodiment]
As described above, according to the first embodiment, the following effects can be obtained.

(1) The control unit 110 as the weft brake control device of the air jet loom of the first embodiment calculates the standard deviation Tiσ of the intermediate arrival timing Ti and the standard deviation TWσ of the end arrival timing TW, and calculates the end arrival timing TW. When the ratio or difference between the standard deviation TWσ and the standard deviation Tiσ of the intermediate arrival timing Ti is out of the set range, it is determined that the braking force of the weft brake 147 is not appropriate.

Here, since the control unit 110 as the weft brake control device of the air jet loom of the first embodiment refers to both the standard deviation Tiσ of the intermediate arrival timing Ti and the standard deviation TWσ of the end arrival timing TW, the characteristics of the weft. It is possible to instantly determine whether the braking force of the weft brake 147 is appropriate without being affected by. Thereby, it can be determined whether or not the braking force of the weft brake 147 is appropriate.

(2) The control unit 110 as the weft brake control device of the air jet loom of the first embodiment calculates the standard deviation Tiσ of the intermediate arrival timing Ti and the standard deviation TWσ of the end arrival timing TW, and calculates the end arrival timing TW. When the ratio or difference between the standard deviation TWσ of the above and the standard deviation Tiσ of the intermediate arrival timing Ti is out of the set range, a warning is issued. Thereby, it is possible to grasp whether or not the braking force of the weft brake 147 is appropriate.

(3) The control unit 110 as the weft brake control device of the air jet loom of the first embodiment calculates the standard deviation Tiσ of the intermediate arrival timing Ti and the standard deviation TWσ of the end arrival timing TW, and calculates the end arrival timing TW. The braking force of the weft brake 147 is adjusted based on the ratio or difference between the standard deviation TWσ of the above and the standard deviation Tiσ of the intermediate arrival timing Ti. As a result, the weft can be appropriately braked.

(4) The control unit 110 as the weft brake control device of the air jet loom of the first embodiment determines the braking force with respect to the ratio or difference between the standard deviation TWσ of the end arrival timing TW and the standard deviation Tiσ of the intermediate arrival timing Ti. By adjusting the braking force within a region where the corresponding change in ratio or difference is smaller than the other regions, it is possible to apply appropriate braking to the weft in a stable state.

(5) In the control unit 110 as the weft brake control device of the air jet loom of the first embodiment, the change in the ratio or difference between the standard deviation TWσ of the end arrival timing TW and the standard deviation Tiσ of the intermediate arrival timing Ti is different. By adjusting the braking force in a region smaller than the region and in which the braking force is not insufficient, it is possible to apply appropriate braking to the weft without excess or deficiency.

(6) The control unit 110 as the weft brake control device of the air jet loom of the first embodiment sets the standard deviation TWσ of the end arrival timing TW and the standard deviation Tiσ of the intermediate arrival timing Ti during the operation of the air jet loom. By calculating the ratio or difference, the weft can be properly braked during the weaving period of the loom.

(7) The control unit 110 as the weft brake control device of the air jet loom of the first embodiment sets the air jet loom in the adjustment mode, and in the adjustment mode, the standard deviation TWσ of the end arrival timing TW and the intermediate arrival timing Ti. By calculating the ratio or difference from the standard deviation Tiσ of, the weft can be appropriately braked without affecting the weaving period of the loom.

(8) In the adjustment mode, the control unit 110 as the weft brake control device of the air jet loom of the first embodiment changes the braking force of the weft brake 147 while changing the standard deviation TWσ of the end arrival timing TW and the intermediate arrival timing. By calculating the ratio or difference of Ti with the standard deviation Tiσ and adjusting the braking force in the area where the change in ratio or difference is smaller than the other areas, without affecting the period of weaving the woven fabric. Appropriate braking can be applied to the weft.

(9) In the case of the conventional device, when the braking force of the weft brake 147 is stronger than the appropriate range, the injection pressure of the main valve 146 is adjusted to a pressure higher than the appropriate pressure in order to keep the timing of reaching the end of the weft properly, and the energy of the weft brake 147 is increased. There was waste.
On the other hand, in the weft brake control device of the first embodiment, by adjusting the braking force of the weft brake 147 to an appropriate range, the injection pressure of the main valve 146 can be maintained appropriately and waste of energy can be suppressed. can. Similarly, the injection pressures of the plurality of sub-valves 163 are also maintained appropriately, and waste of energy can be suppressed.

(10) In the case of the conventional device, since the focus was only on the standard deviation TWσ of the end arrival timing TW, whether or not braking is inappropriate when wefts with different characteristics are used or when the characteristics of the wefts change. It was not possible to make an accurate judgment.
On the other hand, since the control unit 110 as the weft brake control device of the air jet loom of the first embodiment uses the standard deviation TWσ of the end arrival timing TW and the standard deviation Tiσ of the intermediate arrival timing Ti for determination, the characteristics of the weft. It is possible to grasp whether or not the braking force of the weft brake 147 is appropriate without being affected by the difference between the two.

[Other embodiments]
A modification of the first embodiment will be described below.
In the above description, when the ratio (TWσ / Tiσ) of the standard deviation TWσ of the terminal arrival timing TW and the standard deviation Tiσ of the intermediate arrival timing Ti is out of the setting range of 1.2 to 2.0, the control unit 110 is set. I explained that it will issue a warning, but the value of this setting range can be set arbitrarily.

The ratio of the standard deviation TWσ of the terminal arrival timing TW to the standard deviation Tiσ of the intermediate arrival timing Ti may be not only TWσ / Tiσ but also Tiσ / TWσ. That is, the control unit 110 reverses the denominator of the ratio and the numerator, and the ratio (Tiσ / TWσ) of the standard deviation Tiσ of the intermediate arrival timing Ti and the standard deviation TWσ of the terminal arrival timing TW is 0.5 to 0. The control unit 110 may issue a warning when the setting range of 83 is out of range, and the value of this setting range can be arbitrarily set. Further, as described above, the control unit 110 may determine whether or not the braking force is appropriate by obtaining the difference between the standard deviation Tiσ of the intermediate arrival timing Ti and the standard deviation TWσ of the terminal arrival timing TW.

In the above description, the numerical values of the braking force of the weft brake 147 and the values of the standard deviation Tiσ of the intermediate arrival timing Ti and the standard deviation TWσ of the end arrival timing TW are only examples. Therefore, any value suitable for executing the weft brake control can be adopted.

In the above description, the control unit 110 has been described as a weft brake control device, but the present invention is not limited to this. For example, a dedicated weft brake control device may be configured separately from the control unit 110.

In the above description, a specific example of displaying the warning screen 112G on the function panel 112 has been shown, but the present invention is not limited to this. For example, a voice warning message may be output from a speaker near the function panel 112. Alternatively, the warning screen or the warning voice may be output on the terminal owned by the administrator or the weaver via the communication means.

100 Wefting device, 110 Control unit (weft brake control device), 111 CPU, 112 Function panel, 120 Thread feeding unit, 130 Weft length measuring storage unit, 131 Storage drum, 132 Weft locking pin, 133 Balloon sensor, 140 Weft Insert nozzle, 141 tandem nozzle, 142 main nozzle, 143 main regulator, 143a to 143c piping, 144 main tank, 144a, 144b piping, 145 tandem valve, 145a piping, 146 main valve, 146a piping, 147 weft brake, 149 air supply Source, 150 reeds, 150a weft flight path, 160 multiple sub-nozzles, 161 sub-regulators, 161a pipes, 162 sub-tanks, 163 multiple sub-valves, 164 multiple pipe groups, 170 flight sensors, 171 in-width sensors, 172 end sensor, TL weave width, Y weft.

Claims (8)

Weft brake control that includes a main nozzle, a sub nozzle, and a weft brake, and controls the weft brake of an air jet loom in which the weft is wefted through the weft flight path by air injection from the main nozzle and the sub nozzle. It ’s a device,
The detection signal of the end sensor provided at the weaving end on the downstream side of the weaving width in the weft flight path, and
Detection of a weaving width sensor provided on the side opposite to the main nozzle of the weft running path from the center of the weaving width and upstream of the position where the weft tip reaches the braking timing of the weft brake. Signal and
Refer to
The standard deviation of the intermediate arrival timing of the weft tip detected by the weaving width sensor and the standard deviation of the end arrival timing of the weft tip detected by the end sensor are calculated, and the standard deviation of the end arrival timing is calculated. A weft brake control device for an air jet loom that determines that the braking force of the weft brake is not appropriate when the ratio or difference between the ratio and the standard deviation of the intermediate arrival timing is out of the set range. The weft brake control device for an air jet loom according to claim 1, wherein a warning is issued when the ratio or difference between the standard deviation of the end arrival timing and the standard deviation of the intermediate arrival timing is out of the set range. The first or second aspect, wherein the braking force of the weft brake is adjusted when the ratio or the difference between the standard deviation of the end arrival timing and the standard deviation of the intermediate arrival timing is out of the set range. Weft brake control device for air jet looms. With respect to the ratio or difference between the standard deviation of the terminal arrival timing and the standard deviation of the intermediate arrival timing, the braking force is within a range in which the change of the ratio or the difference according to the braking force is smaller than the others. The weft brake control device for the air jet loom according to claim 3. The weft brake control device for an air jet loom according to claim 4, wherein the braking force is adjusted in a region where the change in the ratio or the difference is smaller than the others and the braking force is not insufficient. The weft brake of the air jet loom according to any one of claims 1 to 5, which calculates the standard deviation of the end arrival timing and the standard deviation of the intermediate arrival timing during the operation of the air jet loom. Control device. The item according to any one of claims 1 to 5, wherein the air jet loom is set to the adjustment mode, and the standard deviation of the end arrival timing and the standard deviation of the intermediate arrival timing are calculated in the adjustment mode. Weft brake control device for air jet looms. In the adjustment mode, while changing the braking force of the weft brake, the ratio or the difference between the standard deviation of the end arrival timing and the standard deviation of the intermediate arrival timing is calculated, and the change of the ratio or the difference. The weft brake control device for an air jet loom according to claim 7, wherein the braking force of the weft brake is adjusted in a region smaller than the other.

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