CN1425816A - Pick control method and device - Google Patents

Abstract

The weft insertion control method of the present invention is a weft insertion control method that generates an opening instruction signal for the throttle valve connected to the weft insertion nozzle and controls the jet flow from the weft injection nozzle according to the set jet flow pattern, and is characterized in that It is to detect the arrival time of the weft thread in flight based on the weft thread detection signal from the weft thread sensor, and correct the opening degree command signal based on the deviation of the detected arrival time from the reference time. According to the flying condition of the weft, the jet flow from the weft insertion nozzle can be quickly corrected.

Description

Weft insertion control method and device

Technical field

The present invention relates to a control device for controlling fluid injection from a weft insertion nozzle in a fluid jet loom using pressurized fluid such as pressurized air or pressurized water.

Background technique

As one of the weft insertion control technologies of the fluid jet loom, there is a method of adjusting the jet flow ejected from the weft insertion nozzle by using a cam-controlled throttle valve (Japanese Patent Laying-Open No. 53-10757 communique, Special Publication No. 57-55813). In this background technology, the opening degree of the throttle valve in a weft insertion cycle is determined by the shape of the cam, so as to control the jet flow from the weft insertion nozzle.

However, in the background art described above, in order to change the injection pattern of the fluid injected from the weft insertion nozzle, the cam itself has to be replaced, and thus the replacement work is troublesome. In addition, since the injection pattern cannot be freely set, one cam can only be used for the weft insertion control of a specific weft thread, so it is not practical.

In addition, a method of controlling the jet flow by selectively driving the throttle valve using a plurality of freely set jet flow patterns may be considered. However, in such a technology, even if the jet pattern is properly set for the weft, since the flying condition of the weft changes from time to time, it is impossible to maintain an appropriate fluid jet corresponding to such a change, so there is a waste of time for weft insertion. Fluid or damage to the weft due to excessive fluid injection.

The object of the present invention is to quickly correct the jet flow from the weft insertion nozzle according to the flying state of the weft thread.

Contents of Invention

The weft insertion control method related to the present invention is a weft insertion control method that sends an opening instruction signal to the throttle valve connected to the weft insertion nozzle according to the set jet flow pattern and controls the jet flow from the aforementioned weft injection nozzle, The method includes detecting the arrival time of the weft thread in flight based on the weft thread detection signal from the weft thread sensor, and correcting the deviation of the detected arrival time from the reference time.

The weft insertion control device of the present invention is a setter that includes a jet flow pattern that is set from the weft injection nozzle; The throttle valve sends out the opening instruction signal and controls the weft insertion control device of the control loop of the jet flow from the aforementioned weft insertion nozzle. The aforementioned control loop includes a deviation calculation unit that detects the arrival time of the weft in flight according to the weft detection signal from the weft sensor and calculates the deviation of the detected arrival time relative to the reference time; A correction signal generation unit for a correction signal of the throttle valve; a correction unit that corrects the opening command signal based on the correction signal and outputs the corrected signal as a new opening command signal for the throttle valve.

The "opening degree command signal" mentioned here is a signal to command the opening degree of the throttle valve when it is in the open state. In other words, the jet flow pattern does not include the opening degree 0, that is, the fully closed state.

According to the present invention, according to the jet flow type suitable for the weft line to be inserted, the jet flow rate from the weft injection nozzle in the same weft insertion cycle is controlled by the throttle valve, so the flow rate can be adjusted quickly, and the flow rate can be adjusted properly by setting The unique jet flow pattern can perform weft insertion without causing damage to the weft thread. In addition, since the jet flow is controlled according to the flying state of the weft thread, even if the flying state of the weft thread changes, the time when the weft thread reaches a predetermined position can be kept constant, and the weft insertion can always be performed with an appropriate jet flow.

The weft sensor may include an unwinding sensor that detects a weft that is unwound from the length measuring storage device, or a weft that is disposed in a weft flying path in a warp opening that should detect a weft on the way of weft insertion. sensor.

The weft insertion nozzle includes a nozzle disposed downstream of the arrival position of the front end of the weft when the arrival time is detected, and the control of the jet flow may include adjusting the opening degree of a throttle valve connected to the nozzle according to the corrected opening degree command signal. Methods.

The aforementioned weft insertion nozzles include a plurality of nozzles arranged at intervals in the flying direction of the weft thread, and the control of the aforementioned jet flow may include adjusting the throttle valve connected to the nozzle that is jetting fluid according to the aforementioned corrected opening degree command signal And the method of opening the throttle valve connected to the nozzle to inject the fluid.

The aforementioned deviation calculation unit includes an arrival angle detector that detects the rotation angle of the main shaft when the aforementioned weft detection signal is input as the aforementioned arrival time, and a calculation circuit that calculates the aforementioned deviation amount by comparing the detected arrival time with a reference time, The correction signal generator sends out the correction signal according to the deviation given by the calculation circuit and the rotation angle of the spindle. A controller for the opening command signal, and an adder for adding the opening command signal from the controller and the correction signal from the correction signal generator to output the new opening command signal.

Description of drawings

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

Fig. 2 is a diagram showing an example of a control circuit of the weft insertion control device shown in Fig. 1 .

Fig. 3 is a diagram showing an example of a jet flow pattern of the weft insertion control device shown in Fig. 1 .

Fig. 4 is a diagram showing an example of correction amounts set in a function setter.

Fig. 5 is a diagram showing an example of other correction amounts set in the function setter.

FIG. 6 is a diagram showing an example of a correction signal output from a correction signal generator.

Fig. 7 is a diagram showing an example of control of the throttle valve for the sub-nozzle group by the weft insertion control device.

Detailed ways

Referring to Fig. 1, the air jet loom 10 using compressed air as the fluid for weft insertion introduces the weft thread 14 wound on the thread feeder 12 into the length measuring storage device 16, and stores the weft thread 14 with a length of more than 1 pick. Stay in the length-measuring storage device 16, and the stored weft thread 14 is released by the unwinding needle 18 by picking one shuttle at a time, and the unwinded weft thread 14 is thrown into the warp thread 24 by the main nozzle 20 and a plurality of sub-nozzles 22. In the opening, the inserted weft thread 14 is reeded by the reed 26 before weaving.

The reedted weft yarn 14 is cut at predetermined timing by cutters 30 arranged at each end of the fabric 28 (only one cutter is shown in FIG. 1 ). In this way, a woven cloth 28 having a predetermined width dimension is woven.

Whether the weft yarn 14 is correctly inserted can be judged based on the detection signal of one or more probes (not shown) arranged on the opposite side of the weft insertion side. The weft threads that fail to insert the weft correctly are removed from the opposite side of the weft inserting side by the removing device not shown in the figure.

In the loom 10, the rotation of the main shaft 32 is detected by the encoder 34, and the rotation angle signal θ corresponding to the rotation of the main shaft 32 is output from the encoder 34 to various circuits and devices of the loom.

Compressed air as fluid for weft insertion is supplied to the main nozzle 20 through a throttle valve 38 from a compressed air source 36 which is a common fluid supply source, and is supplied to a plurality of sub-nozzles 22 through a plurality of throttle valves 38 . More specifically, the sub-nozzles 22 arranged in the meridian openings are arranged as one group, and the compressed air is supplied to the sub-nozzles 22 through the throttle valves 38 arranged in each group.

Each throttle valve 38 is a well-known valve mechanism having a valve seat and a valve body, and the valve body is driven by an electric regulator such as a servo motor. The amount of rotation and the speed of rotation of this electric regulator are controlled by the weft insertion control device 40 .

In the loom 10, the throttle valve 38 is arranged in the fluid passage between the compressed air source 36 and the main nozzle 20 and the sub-nozzle 22, but the on-off valve is not arranged. Therefore, the opening amount of the throttle valve 38 , that is, the opening degree, is controlled by the weft insertion control device 40 . In this way, the amount of fluid (the amount of compressed air) sprayed from the main nozzle 20 and the sub-nozzle 22 is adjusted to an appropriate value.

The weft thread 14 is wound on the drum of the length-measuring storage device 16 in the form of multiple turns, the lock of the locking needle 18 is opened during weft insertion, and the weft thread 14 is drawn from the length-measuring storage device 16 under the action of the jet flow of the main nozzle. Lead out, insert weft into the warp opening. Thereafter, the weft thread 14 is locked again by the unwinding sensor or the locking needle 18 that enters and exits at a predetermined appropriate moment, and the long weft thread of 1 pick is unraveled.

In the illustrated example, the weft thread with a length of more than 1 pick is stored on the cylinder of the length measuring storage device 16, and the weft thread with the length of 1 pick is unwound during weft insertion; The drum of the length measuring storage device 16 that should be rolled in from the weft of the thread body 12 is rotated, and a part of the newly rolled in weft is used as a part of the weft used for this weft insertion. In either case, during weft insertion, the weft thread 14 is not constrained to the length-measuring storage device 16, but can fly freely.

When the weft is bounded by the length measuring and storage device to fly, that is, the so-called restrained flight, the weft is in an over-tension state due to the restraint, which will cause damage such as thread breakage to the weft. However, if the flying of the weft is unconstrained and free to fly, it will not cause such damage to the weft.

The weft thread 14 is subjected to the jet flow effect from the weft insertion nozzle, and is drawn out from the length-measuring storage device 16 one turn at a time. The drawn weft thread is detected by the unwinding sensor 42 once per turn. The weft detection signal S1 from the unwinding sensor 42 is supplied to the weft insertion control device 40 and various circuits and devices of the loom 10 .

The number of weft stitches unwound from the length measuring storage device 16 is associated with the front end position of the weft yarn. Therefore, in the illustrated example, the weft yarn detection signal S1 from the unwinding sensor 42 is sent to the weft insertion control device 40. Among them, it is used as a signal to detect the arrival time of the front end of the weft thread 14 at a predetermined position during weft insertion.

The weft insertion control device 40 includes: a setter 44, which sets the jet flow patterns of the fluids of a plurality of weft insertion nozzles in a weft insertion cycle for each selection signal S2; The set jet flow pattern sends an opening degree command signal to a plurality of throttle valves 38 connected to the weft insertion nozzles 20, 22, and corrects or corrects the opening degree command signal to control the jet flow from the weft insertion nozzles 20, 22 .

Each jet flow pattern S3 preset in the setter 44 represents the change degree of the amount of fluid sprayed from the main nozzle 20 and each sub-nozzle 22 over time in a weft insertion cycle, that is, it means that when the injection starts, it reaches a steady state from the beginning of the injection. The increase of the flow rate, or the flow change degree of the flow rate decrease from the steady state to the end of the injection at the end of the injection.

The control loop 46 receives the rotation angle signal θ from the encoder 34 and the weft detection signal S1 from the unwinding sensor 42, and also accepts various signals sent by the main control device (not shown) of the loom 10. A selection signal S2.

A weft selection signal specifying the type of weft used for weft insertion, or a rotational speed signal representing a delay in the loom's rotational speed can be used as the selection signal S2. Therefore, for each weft thread selection signal (each weft thread capable of weft insertion) and each rotational speed signal, the jet flow pattern is respectively set in the setter 44 .

In addition, in the control loop 46, through the setter not shown in the figure, corresponding to the conditions such as the selected weft yarn and the rotating speed of the loom, the unwinding and locking times of the weft are preset; The selection signal and the rotational speed signal θ send out the driving command signal S4 to control the action of the locking needle.

The control circuit 46 also reads the jet flow pattern S3 corresponding to the new selection signal S2 from the setter 44 according to the switch of the aforementioned selection signal S2, and according to the read jet flow pattern S3, the rotation angle signal θ and the weft detection The signal S1 is output, and the opening degree command signal S5 is supplied to the electric motor of each throttle valve 38 in order to change the opening degree of the throttle valve 38 to a value corresponding to the aforementioned weft detection signal S1, jet flow pattern S3, and rotation angle signal θ. The regulator controls the opening of each throttle valve 38.

Specifically, the control circuit 46 first reads the spray pattern S3 corresponding to the received rotation angle signal θ and the selection signal S2 from the setter 44, and generates and controls each throttle valve according to the read spray pattern S3. 38 opening degree command signal.

Next, the control circuit 46 detects the arrival time when the front end of the weft 14 reaches the predetermined position according to the rotation angle of the main shaft 32 and the weft detection signal S1; and calculates the deviation between the detected arrival time and its reference time.

Then, the control circuit 46 corrects the opening degree command signal generated according to the jet flow pattern S3 representing the above-mentioned flow change degree corresponding to the calculated deviation, and outputs the corrected opening degree command signal S5 to Each electric regulator of the main nozzle 20 and each sub-nozzle 22.

In this way, within the same weft picking cycle, the main nozzle 20 and each sub-nozzle 22 are driven, and their openings are changed according to the rotation angle of the main shaft 32 and the delay when the weft reaches a predetermined position, so that the main nozzle 20 and each sub-nozzle 22 are driven. The spray flow sprayed by the nozzle 20 and each sub-nozzle 22 changes rapidly.

The opening command signal S5 is different for each throttle valve 38 . However, the opening degree command signal S5 may be the same for all the throttle valves 38 for the sub-nozzle 22 .

The arrival time can be taken as the time when the front end of the weft reaches the midway position of weft insertion. For example, in the case where 3 weft threads are drawn out from the length measuring storage device 16 for each weft insertion, at such arrival time, the detection signal S1 of the 1st or 2nd weft thread can be input from the unwinding sensor 42. When reaching the control loop 46, the value of θ of the rotation angle signal. The position of the unwinding sensor 42 is not limited to the example shown in the figure, and may be disposed at any position on the surface of the fixed drum.

The opening control of the throttle valve 38 and the control of the jet flow by the control circuit 46 are performed during the weft insertion period when the front end of the weft thread reaches the midway position of the weft insertion is detected, not in the next weft insertion period. within the cycle.

Therefore, in the same weft picking cycle, the arrival time of the weft thread is detected, and accordingly, the fluid injection amount from the main nozzle 20 and each sub-nozzle 22 changes corresponding to the rotation angle of the main shaft 32 and the arrival time of the weft thread.

To sum up, according to the jet flow type suitable for the weft line to be inserted, the jet flow from the weft injection nozzle in the same weft insertion cycle is controlled by the throttle valve, so the flow can be adjusted quickly and can be adjusted by setting Proper jet pattern for weft insertion without damage to the weft thread. In addition, since the jet flow is controlled according to the flying state of the weft thread, even if the flying state of the weft thread changes, the time when the weft thread reaches a predetermined position can be kept constant, and the weft insertion can always be performed with an appropriate jet flow.

The opening control of the throttle valve 38 and the control of the spray flow by the control circuit 46 may also throttle the flow of one or more sub-nozzles 22 connected to the downstream of the weft front end position whose arrival time is detected. valve 38.

For example, in the example shown in Fig. 1, 3 laps of weft threads are drawn out from the length measuring storage device 16 each time weft is inserted, and the unwinding sensor 42 sends out a weft thread detection signal when 1/2 laps of weft threads are unrolled. S1, in the case of one turn of weft insertion, when the weft reaches the second group of sub-nozzles from the side of the main nozzle 20, the throttle valve 38 that communicates with the sub-nozzles downstream of the second group of sub-nozzles and the main The throttle valve 38 connected to the nozzle controls the opening degree and the spray flow.

However, it is also possible to control the opening degree and spray flow of the throttle valve 38 connected to the nozzle that is spraying the fluid and the throttle valve 38 connected to the nozzle to be sprayed. In this way, compared with the above example, the number of throttle valves (weft insertion nozzles) to be controlled is increased, and a greater effect can be expected.

Regardless of the control method, the throttle valve for flow control can be all of the above-mentioned throttle valves as the control target, or it can be one throttle valve or two or more throttle valves among these throttle valves. Throttle valve.

As the weft sensor that detects the moment when the front end of the weft arrives on the way of weft insertion, in addition to the unwinding sensor 42, for example, a sensor that detects the weft sensor at the front end of the weft can be used that is arranged on the way of the weft flight path in the warp opening. detector.

Regardless of the type of weft sensor, it is possible to use a reflective sensor that irradiates light on the weft and receives reflected light from the weft, and a transmissive sensor that detects the weft by blocking the light irradiated on the weft by the weft. any of the sensors. In addition, in addition to the above-mentioned optical sensor, other non-contact sensors can also be used as the weft sensor.

In the above-mentioned embodiments, the present invention is applied to the air jet loom 10 having a single-color weft insertion device, but the present invention can also be applied to an air jet loom having a so-called multi-color weft insertion device of two or more colors. In this case, for each kind of weft thread that can be inserted, it is equipped with a thread body, a length measuring storage device, a main nozzle and a throttle valve.

In the above-mentioned embodiment, throttle valves are used for the main nozzles and sub-nozzle groups respectively, but the present invention can also use throttle valves for only one or more nozzles that should change the fluid injection amount, that is, the throttling amount, among these throttle valves. . In addition, the above technique is applicable not only to the control of injection of weft injection nozzles such as main nozzles and sub-nozzles, but also to the control of fluid injection from other weft injection nozzles such as tension nozzles for eliminating weft slack.

Next, referring to FIG. 2 , the control circuit 46 will be described in more detail. Fig. 2 shows an example of application of the present invention to an air-jet loom having a single-color weft insertion device employing a throttle valve 38 for one main nozzle.

The valve part formed by the valve seat 50 and the valve body 52 of each throttle valve 38 is located between the input port 54 and the output port 56, and the valve body 52 is driven by the corresponding electric regulator 58 to change the opening degree of the valve part to be controlled. The value corresponding to the opening command S2 supplied by the loop 46.

Compressed air, which is a fluid for weft insertion, reaches the weft insertion nozzle through the input port 54 of each throttle valve 38 through the output port 56, and is injected from the weft insertion nozzle. The ejection amount of the compressed air injected from each weft insertion nozzle, that is, the injection amount, is proportional to the opening degree of the corresponding throttle valve 38 .

In the illustrated example, the valve body 52 having a threaded part matched with the female threaded hole of the valve seat 50 rotates under the action of the electric regulator 58, thereby moving linearly relative to the valve seat 50 to open and close the valve part. However, other throttle valves may also be used.

In more detail, regarding the structure of the throttle valve, that is, the mechanism that drives the valve body that should adjust the jet flow to advance and retreat relative to the valve seat, a linear motor can also be used to directly advance and retreat the valve body, instead of the above-mentioned rotary adjustment using threaded part + electric motor. device method. In other words, a well-known throttle valve capable of spray flow adjustment (opening degree adjustment) by an electric signal may be used.

The electric regulator 58 is a phase-controllable regulator like a pulse motor, or a position-controllable regulator like a servo motor, and is controlled by the control circuit 46 .

In the jet flow pattern setter 44, in a weft picking cycle, the openings (in other words, throttling amounts) of the throttle valves 38 corresponding to the rotation angles (θ0, θ1, θ2...) of the main shaft are used as the throttle valves 38 The jet flow pattern S3 of is set in the form of a function f(θ) corresponding to the rotation angle θ of the main shaft 32 .

The jet flow type S3 can be set appropriately. For the weft that is easy to break, it is set so that the rate of change of the flow rate at the beginning and end of the jet should be gentle; Reduce flow, etc.

Fig. 3 is an example of a jet pattern during one weft insertion. Among them, the throttle valve openings fA(θ), fB(θ), fC(θ)... are used as each jet flow pattern, and the rotation angle (θ) of the main shaft is used as the horizontal axis.

The setting parameters of such a spray pattern may include, the opening degree of the throttle valve set at any value between 100% and 0% (for example, P1, P2, P3), and the opening degree of the throttle valve as the The rotation angle (θ) of the spindle that is set at the time when the degree is changed to P1, P2, P3, P4, etc. (for example, ON1, ON2, OFF1, etc.).

The specific values of the above setting parameters P1, P2, P3, P4, ON1, ON2, ON3, OFF1, etc. can be freely set for each jet flow type, taking into account the type of thread and the speed of the loom. .

Type A is a rectangular jet form suitable for ordinary wefts that are not easy to break. This type A, for example, can be set to P1=50% ON (ON1) when θ=60 degrees, and can be set to P2=0% OFF (OFF1) when θ=200 degrees.

Types B to E are the spray forms for weak wefts that are easy to break, and can also be used to prevent useless jets in the transitional turning state when the loom is started.

Type B is an example in which the opening at the start of injection changes with a certain increase rate α. For example, it can be set by using ON1 and OFF1 in Type A, and the increase rate α1 of the opening from 0% to 50% (P1). .

Type C is an example where the opening degree changes in steps at the beginning of injection. For example, it can pass through the opening degrees P1 (25%), P2 (35%), P3 (50%) and P4 (0%), and should achieve these The time of opening value is ON1, ON2, ON3, OFF1 to set.

Contrary to Type B, Type D is an example in which the opening at the end of injection changes at a certain rate of decrease β. For example, ON1 and P1 of Type A can be used, and the opening starts from 50% (P1) to 0% (P2) Decrease time OFF1, and the decrease rate β when the opening reaches 0% from 50% are set.

Form E is an example where the opening at the end of the injection changes in steps, for example, it can pass through the openings P1 (50%), P2 (35%), P3 (20%) and P4 (0%), and should achieve these Time ON1, OFF1, OFF2 and OFF3 of the opening value are set.

The jet flow pattern can also be set by methods other than those described above, and is not limited to the illustrated example. When switching the jet stream pattern according to the type of weft thread by using the weft thread selection signal, the following pattern can also be used.

1. For ordinary wefts that are not easy to break, use an ordinary type like type A.

2. For the weft that is easy to break, use the type B, C, D, E, which has a slow change in flow rate at the beginning and end of injection.

3. For the weft that is easy to loosen, use a pattern that stops the flow immediately before being restrained by the warp like pattern A.

In addition, when the jet flow pattern is switched according to the type of the weft yarn by using the rotational speed signal, the following pattern can also be used.

4. In the transitional state at start-up, since the spraying time of the nozzle with slow loom speed becomes longer, it is possible to use types such as types B, C, and D that can prevent damage caused by thread breakage.

5. In the normal rotation state, use a general type like type A.

In addition to switching the jet flow pattern according to the speed signal representing the measured speed, it is also possible to switch the jet flow pattern according to the number of picks after starting when the time from starting to normal speed is like when the loom is started, for example, if the number of picks is known. to switch the spray pattern.

In the above-mentioned embodiment, the type of weft is selected according to the selection signal, and then the spray pattern set by the rotating speed of the loom is selected, but the spray pattern can also be selected only corresponding to any one of the weft or the rotating speed. . In addition, in the case of single-color weft picking, it is also possible not to use the selection signal, but to consider the type of weft when changing the fabric, and set a jet flow pattern according to one of the above-mentioned jet flow patterns A to D , and continuously use this spray pattern to control the opening of the throttle valve 40.

FIG. 3 only shows a plurality of jet flow patterns in which the jet flow rate of change is changed at the start of injection and at the time of injection flow rate, but it is also possible to control the throttle valve using a plurality of jet flow patterns at the start of injection and the end of injection.

In any of the above cases, the jet flow pattern can be set for each throttle valve separately, or more than one jet flow pattern can be set for the main nozzle throttle valve, and all the throttle valves for the sub nozzles can be throttled. The valve is set to one or more common jet flow patterns.

However, in the following description, it is assumed that a plurality of jet flow patterns are set for each throttle valve.

Referring again to FIG. 2, the control circuit 46 includes a deviation calculation unit 60 that calculates the deviation Δθ between the arrival time of the front end of the weft thread and its reference time on the way of weft insertion, and a plurality of throttle valves that are equipped with each throttle valve 38 to control Section 62.

The deviation calculation unit 60 detects the arrival time of the front end of the weft on the way of weft insertion through the angle detector 64 according to the weft detection signal S1 from the unwinding sensor 42 and the rotation angle signal θ from the encoder 44 shown in FIG. 1 θs, and the calculation circuit 68 calculates the deviation Δθ between the detected arrival time θs and the reference time θst set in the reference time setter 66.

For example, when the unwinding sensor 42 shown in Fig. 1 sends out the expression 1/2 circle, the 3/2 circle, and the 5/2 circle respectively under the situation of the latitude thread detection signal S1 that is wired, the 1/2 circle can be The value θs of the rotation angle signal θ at the time when the latitude detection signal S1 of the 2nd or 3/2 turn is sent out is taken as the arrival time θs.

The setter 64 sets a reference time for the arrival time of the front end of the weft and the like for each of the weft threads. The reference time may be the same value, or different values may be used for various lines. In the illustrated example, one reference pattern setter 64 is used in common for all the throttle valve control units 62 , but the reference pattern setter 64 may be separately provided for each throttle valve control unit 62 .

Each throttle valve control unit 62 includes the following parts, as shown in one of them: a controller 70 that generates an opening command signal P1 for the corresponding throttle valve according to the rotation angle signal θ, the selection signal S3 and the spray flow pattern S3; The function setter 72 that presets the correction amount f(Δθ) corresponding to the deviation amount and the correction amount g(θ) corresponding to the spindle rotation angle; the correction signal generator 74 that generates the correction signal ΔP; the controller 70 The adder 76 for adding the output signal of the correction signal generator 74 and the output signal of the correction signal generation part 74; and the amplifier 78 for amplifying the output signal of the addition part 76.

According to the input selection signal S3, the controller 70 reads the jet flow pattern S3 corresponding to the selection signal S3 and the throttle valve 38 from the jet flow pattern setter 44, and calculates according to the read jet flow pattern S3. The device 76 outputs an opening command signal P1 corresponding to the rotation angle signal θ.

An unillustrated loom operating signal indicating the operating state of the loom has been input to the controller 70, so the controller 70 performs the above-mentioned output when the loom is operating, and recognizes that the loom is in a stopped state by turning off the loom operating signal. Therefore, regardless of the rotation angle of the main shaft, the jet flow will be stopped, or the opening degree command signal that should be reduced to a small amount of jet flow can be output according to the preset setting in order to prevent the weft thread from coming out of the nozzle.

The pre-set correction amounts f(Δθ) and g(θ) in the function setter 72 can correspond to the size of the deviation Δθ, and are set as functions with variable output levels: when the deviation Δθ is a negative value (the arrival time earlier than the reference time), the correction amount becomes a negative value that should reduce the corresponding throttle opening; when the deviation Δθ is a positive value (the arrival time is later than the reference time), the correction amount becomes the corresponding throttle opening Positive value for increasing valve opening.

As shown in FIG. 4(A) or (B), the correction amount f(Δθ) can be made as a correction amount corresponding to the deviation Δθ and the throttle valve 38, and can be set separately for various types of possible weft insertion threads. Figure 4(A) is an example of a function in which the correction amount f(Δθ) changes linearly in proportion to the deviation Δθ, and Figure 4(B) is an example of a function in which the deviation f(Δθ) changes linearly in a stepwise manner corresponding to the deviation Δθ.

As shown in Figure 5, the correction amount g(θ) can be made corresponding to the main shaft rotation angle θ and the throttle valve 38, and is used to correct the correction amount f(Δθ) for the correction amount of the correction amount f(Δθ). Make settings. In the example of FIG. 5 , the correction amount g(θ) is a function that changes in a quadratic curve until the spindle rotation angle θ reaches a predetermined value, and then becomes a constant value.

The correction signal generator 74 uses the input rotation angle signal θ to read the correction amounts f(Δθ) and g(θ) corresponding to the input selection signal S2 from the function setter 72 for each spindle rotation angle, and The product of the read correction amounts f(Δθ) and g(θ) is output to the adder 76 as a correction signal ΔP for correcting the opening command signal P1 from the controller 70 .

An example of the correction signal ΔP output from the correction signal generator 74 is shown in FIG. 6 . The example of the correction signal ΔP in FIG. 6 uses the correction amount f(Δθ) shown in FIG. 4(A) and the correction amount g(θ) shown in FIG. 5 . Therefore, for each condition such as the kind of weft yarn or the loom rotation speed, a function expressing the correction signal ΔP corresponding to the corresponding throttle valve 38 as shown in FIG. 6 can be set in the function setter 72, respectively.

In the illustrated example, the function setter 72 and the correction signal generator 74 constitute a correction signal generator 80 and operate. Not only can the correction signal generation unit 80 be provided for each throttle control unit 62 , but also the same correction signal generation unit 80 can be used in common among a plurality of throttle control units 62 .

In the latter case, the correction amounts Δ(θ) and g(θ) can be set in the function setter 72 for each throttle control unit 62, or the correction amounts Δ(θ) and g(θ) can be set for a plurality of throttle control units. 62 uses common correction amounts Δ(θ), g(θ) in the function setter 72 . In addition, the correction signal ΔP for each throttle control unit 62 may have a different value, or a common correction signal Δθ may be used by a plurality of throttle control units 62 .

The adder 76 adds the two signals of P1 and ΔP. In this way, the opening command signal P1 from the controller 70 is corrected, that is, corrected, using the correction signal ΔP and based on the deviation Δθ.

The output signal of the adder 76 is sent to the amplifier 78, and the driving current corresponding to the change amount of the opening command is supplied to the regulator 58 of the corresponding throttle valve 38 as a new opening command signal S5. Therefore, the regulator 58 rotates, and the opening degree of the throttle valve 38 changes, As a result, the jet flow from the corresponding weft insertion nozzle is changed.

In the above-mentioned embodiment, the throttle valve control unit 62 is provided for each throttle valve 38, but it is also possible to control a plurality of throttle valves 38 using one throttle valve control unit 62. In this case, the opening degree command signal S5 may have a different value for each throttle valve, or may use the same value for a plurality of throttle valves.

An example of the control of the throttle valve 38 for the sub-nozzle group by the above-mentioned weft insertion control device 10 is shown in FIG. 7 . In Figure 7, (A) is the jet flow pattern, (B) is the correction amount ΔP, (C) is the corrected opening command signal P1+ΔP, (D) is the drive current for the regulator, (E) is pressure waveform.

In order to reduce the damage to the weft and warp, in the jet flow pattern shown in Fig. 7(A), the rate of change of the flow rate at the beginning and end stages of the jet is relatively gentle.

For the above-mentioned jet flow pattern, the correction amount ΔP is generated through the detection of the arrival angle of the front end of the weft. More specifically, if the arrival time of the latitude is late, the correction amount Δθ shown by the solid line in Fig. 7(B) will be generated, and thus the opening command signal will be corrected, as shown by the solid line in Fig. 7(C). Therefore, the driving current shown by the solid line in FIG. 7(D) is supplied to the regulator, and the jet flow changes as shown by the solid line in FIG. 7(E).

On the contrary, if the arrival time of the latitude is early, the correction amount Δθ shown by the dotted line in Fig. 7(B) will be generated, and thus the opening degree command signal will be corrected as shown by the dotted line in Fig. 7(C), so the The drive current shown by the dotted line in FIG. 7(D) is supplied to the regulator, and the jet flow changes as shown by the dotted line in FIG. 7(E).

To sum up, by quickly adjusting the flow rate and setting an appropriate jet flow pattern, it is possible to perform weft insertion without causing damage to the weft thread. In addition, even if the flying condition of the weft changes, the timing at which the weft reaches a predetermined position can be kept constant, and weft insertion can always be performed with an appropriate jet flow.

This embodiment can have the following modifications. The number of grouped sub-nozzles 22 can be appropriately selected according to the fabric, the type of weft, etc. Ideally, if each sub-nozzle 22 is provided with a throttle valve 38, the weft can be controlled without damage. In addition, on the contrary, if the method is simplified, a throttle valve can also be provided for the main nozzle and a part of the throttle valve, and the combination of the controlled weft insertion nozzle and the throttle valve is not limited.

In the case of an air-jet loom equipped with a multi-color weft insertion device, the opening of the throttle valve and the jet flow can also be controlled according to the type of weft. In addition, the control circuit 46 may be configured using a computer and software instead of the hardware configuration shown in FIGS. 1 and 2 .

In the correction amount f(Δθ) and (θ) set in the function setter, it is possible to set a so-called non-sensitive band, that is, an area where correction is not performed when the arrival time is near the reference time, or a so-called limit band, That is, the area where the correction amount is limited when the arrival time is far away from the reference time.

In the above-mentioned embodiment, the arrival time of the latitude is determined by the angle signal of the main axis as a scale; however, it may be determined by the time from the main axis angle as a reference. In addition, in the above-mentioned embodiment, the opening degree command signal is corrected according to the deviation of the arrival time of the latitude relative to the reference time; it is also possible not to use the deviation, but only according to whether the arrival time is late or early relative to the reference time. This sooner or later information is used to correct the opening command signal, which is also included in the aforementioned "correction based on deviation". For example, as the lateness information, it is possible to count the number of times that the arrival time of the weft thread is late or late relative to the reference time within a plurality of picking ranges, and correct the above-mentioned opening degree command signal according to the counting result.

In the present invention, in the above embodiment, no switch valve is configured on the fluid path between the compressed air source and the nozzle, but the present invention can configure such a switch valve on the fluid path between the compressed air source and the nozzle, and It is also possible to open the aforementioned fluid passage during the weft insertion period by using both of them to control the fluid injection amount.

The present invention is not limited to the above-described embodiments. The present invention can be modified in various ways as long as it does not deviate from the gist.

DESCRIPTION OF SYMBOLS 10 Air-jet loom 14 Weft thread 20 Main nozzle 22 Sub-nozzle 24 Warp thread 26 Reed 28 Weaving fabric 32 Main shaft 34 Encoder 36 Compressed air source 38 Throttle valve 40 Weft insertion control device 41 Unwinding sensor 44 Jet flow Type setter 46 Control circuit 50 Valve seat 52 Valve body 54 Input port 56 Output port 58 Regulator 60 Deviation calculation part 78 Amplifier 80 Correction signal generation part

Claims (6)

1. A weft-inserting control method that sends an opening instruction signal to the throttle valve connected to the weft-inserting nozzle and controls the jet-flow from the aforementioned weft-inserting nozzle according to the jet-flow pattern set, it is characterized in that, It is a weft insertion control method including detecting the arrival time of the weft thread in flight based on the weft thread detection signal from the weft thread sensor, and correcting the aforementioned opening degree command signal according to the deviation of the detected arrival time relative to the reference time. 2. The weft insertion control method according to claim 1, wherein the weft thread sensor includes an unwinding sensor that detects the weft thread that is unwound from the length measuring storage device, or is configured to detect The weft sensor of the weft thread flying path in the warp thread opening of the weft thread on the way of weft insertion. 3. The weft insertion control method according to claim 1 or 2, wherein the weft insertion nozzle comprises a nozzle disposed downstream of the arrival position of the front end of the weft thread when the arrival time is detected, and the control of the aforementioned jet flow comprises the following steps: A method of adjusting the opening degree of the throttle valve connected to the nozzle with the corrected opening degree command signal. 4. The weft insertion control method according to claim 1 or 2, characterized in that, the aforementioned weft insertion nozzles include a plurality of nozzles arranged at intervals in the flying direction of the weft, and the control of the aforementioned jet flow includes: A method of adjusting the opening degrees of a throttle valve connected to a nozzle that is spraying fluid and a throttle valve connected to a nozzle that is about to spray fluid with the corrected opening degree command signal. 5. A setter that includes setting the spray flow pattern of the fluid from the weft insertion nozzle and the opening degree of the throttle valve that is communicated with the aforementioned weft injection nozzle according to the spray flow pattern output of the setter A weft insertion control device for commanding signals and controlling the control circuit of the jet flow from the aforementioned weft insertion nozzle, characterized in that, The aforementioned control loop includes a deviation calculating part that detects the arrival time of the weft on the way according to the weft detection signal from the weft sensor and calculates the deviation of the detected arrival time relative to the reference time; A correction signal generation unit for a correction signal of the opening degree of the throttle valve; a correction unit for correcting the opening degree command signal based on the correction signal and outputting the corrected signal as a new opening degree command signal for the throttle valve . 6. The weft-inserting control device according to claim 5, wherein the deviation calculation section includes an arrival angle detector that detects the rotation angle of the main shaft when the weft detection signal is input as the arrival time; and Comparing the detected arrival time with the reference time and calculating the calculation circuit of the aforementioned deviation, The correction signal generation unit generates the correction signal based on the deviation from the calculation circuit and the rotation angle of the spindle, The aforementioned correction unit includes a controller that outputs the aforementioned opening degree command signal corresponding to the aforementioned spindle rotation angle according to the spray pattern set by the aforementioned setter; and the opening degree command signal from the controller and the aforementioned correction signal An adder for adding the correction signal of the generating unit to output the new opening degree command signal.

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