JPH0726443A - Jet loom - Google Patents

Abstract

PURPOSE:To provide a jet loom ensuring the impact on wefts to be assuredly relaxed in holding the wefts at a holding pin. CONSTITUTION:The objective jet loom is equipped with (A) a picking device designed to unwind wefts wound on a reserving drum through the retreat of a holding pin 22 and to pick the unwound wefts in an opening of warps through a picking nozzle 24, (B) a brake designed to actuate at a timing set in advance and brake wefts running afloat in air, (C) a means to calculate the speed of wefts running afloat in air or the tension thereon when they are held at the holding pin, and (D) a control means to calculate the picking starting time based on the value resulted from the means C and to control the picking device based on the picking starting time calculated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jet loom such as an air jet loom and a water jet loom, and more particularly to a jet loom for braking a weft during flight.

[0002]

2. Description of the Related Art A jet loom that locks a weft on a locking pin at the end of weft insertion is used at the end of weft insertion in order to reduce the impact on the weft when the weft is locked on the locking pin. A braking device for braking the weft is provided.

As one of this type of jet loom, the flight speed of the weft during weft insertion is measured based on the output signal of one photoelectric sensor, and the weft insertion cycle after that is measured based on the measured flight speed. There has been proposed a method of calculating a braking amount for controlling the braking device based on the calculated braking amount (Japanese Utility Model Laid-Open No. 62-166283).

However, in this jet loom, the arrival of the weft at a predetermined position is detected by one photoelectric sensor, and the flight speed of the weft is measured by comparing the detection timing with the reference timing. Therefore, the measured speed is the average speed over the entire weft insertion period, not the final weft insertion speed.

That is, when the weft flight speed is measured by comparing the detection timing with the reference timing, the difference between the two timings is not only the flight speed at the end of weft insertion but also the flight speed at the early stage of weft insertion. Even if there is a big difference in both timings, it does not mean that it is due to the flight speed at the end of weft insertion. The speed is not correct.

As described above, even if the braking amount is calculated based on the data of whether the flying speed of the weft at the end of weft insertion is correct or not, the correct braking amount cannot be obtained. Therefore, in such a jet loom, it is not possible to properly mitigate the impact when the weft is locked by the locking pin.

As one of other jet looms, the flight speed of the weft in the initial stage of weft insertion is measured based on the output signal of one photoelectric sensor, and the weft insertion cycle of the weft insertion cycle is measured based on the measured flight speed. There is proposed a method of calculating a braking amount for controlling the braking device based on the calculated braking amount (Japanese Patent Publication No. 3-50019).

However, in other jet loom, the measured flight speed is in the early stage of weft insertion. Therefore, if the flight speed changes after the velocity measurement, for example, at the end of weft insertion,
The correct amount of braking cannot be obtained. Therefore, even such a jet loom cannot properly mitigate the impact when the weft is locked by the locking pin.

[0009]

SUMMARY OF THE INVENTION An object of the present invention is to make it possible to accurately reduce the impact on the weft when the weft is locked by the locking pin.

[0010]

According to the present invention, a weft thread wound around a storage drum is unwound by retracting a locking pin, and the unwound thread is wefted into a warp opening by a weft insertion nozzle. In a jet loom including a loading device and a braking device that operates at preset timing to brake the flying weft, the weft flying speed when the weft is locked by the locking pin. Alternatively, it includes a calculation means for calculating the tension and a control means for calculating a subsequent weft insertion start time based on the value calculated by the calculation means and controlling the weft insertion device based on the calculated start time. Characterize.

If the flying speed or tension of the weft yarn at the end of weft insertion is high, the time from when the braking device is operated to when the weft yarn is locked by the locking pin is short, so the braking force acting on the weft yarn is reduced. There is a shortage and the impact when the weft is locked by the locking pin is large.

Therefore, when the flight speed or tension of the weft yarn at the end of weft insertion is large, the weft insertion start time is delayed. As a result, the time from when the braking device is operated to when the weft is locked by the locking pin becomes longer, so that the weft receives the braking force for a longer time, and as a result, the weft is locked by the locking pin. The impact when hit is reduced.

When the flight speed or tension of the weft yarn at the end of weft insertion is small, conversely to the above, the weft insertion start time is advanced and the period in which the braking force acts on the weft yarn is shortened. In this case, the impact when the weft thread is locked by the locking pin has an excessively small value before the weft insertion start time is advanced, but the weft insertion start time is advanced and the braking force is applied during the operation period. By shortening, the size is increased to the extent that thread breakage does not occur.
As a result, the flight speed of the weft thread is not reduced to an extremely low value, so that weft insertion does not become unstable,
It is possible to prevent the occurrence of yarn breakage when the weft is locked.

According to the present invention, the weft insertion start timing is changed in order to change the braking time based on the flying speed or tension of the weft when the weft is locked by the locking pin. The impact acting on the weft when stopped can be accurately mitigated.

On the basis of the calculated start time, the control means can control the start time of the retraction of the locking pin and the start time of the fluid injection from the weft insertion nozzle. When the injection start timing of the fluid from the weft insertion nozzle is set before the retracting start timing of the locking pin, the retracting start of the locking pin is started based on the calculated start timing. Only the time may be controlled by the control means.

When the flying speed of the weft is used to calculate the start time, the calculating means determines the weft based on the output signals of a plurality of photoelectric sensors arranged at intervals to detect the weft. A first calculation circuit for obtaining the flight speed of the weft thread immediately before being locked by the locking pin, and a deviation between the target value of the flight speed and the flight speed obtained by the first calculation circuit. A second calculation circuit, and the control means calculates a weft insertion start time at the time of subsequent weft insertion based on the deviation obtained by the second calculation circuit, and based on the calculated start time. A controller for controlling the weft inserting device may be provided.

On the other hand, when the tension of the weft is used for the calculation of the start time, the calculating means measures the tension of the weft when the weft is locked by the locking pin; A weft insertion start time at the time of subsequent weft insertion based on the deviation obtained by the calculation circuit, and a calculation circuit for obtaining a deviation between the target value of the tension and the tension measured by the measurement circuit. And a controller that controls the braking mechanism based on the calculated start time.

[0018]

EXAMPLES Referring to FIG. 1, an air jet loom,
The jet loom 10 such as a water jet loom corrects the subsequent weft insertion start time based on the flying speed of the weft when the weft is locked by the locking pin.

The weft 12 is guided from the yarn feeder 14 to a weft inserting device 18 via a length measuring and storing device 16. Also,
The weft 12 is wound around the drum 20 of the length measurement storage device 16 a predetermined number of times, and the locking pin 22 of the length measurement storage device 16 is wound.
It is locked so that it can be unwound. The tip portion of the weft 12 reaches the weft inserting nozzle 24 of the weft inserting device 18.

The locking pin 22 is driven by the reciprocating solenoid 26 of the length measurement storage device 16. The ejection of the weft inserting fluid such as air and water from the nozzle 24 is controlled by a solenoid valve 28 of the weft inserting device 18. The timing of the operation of the solenoid 26 and the solenoid valve 28 is controlled by the timing controller 30.

The timing controller 30 uses a weft insertion nozzle based on an output signal θ of an encoder 34, which generates a signal corresponding to the rotation angle of the main shaft 32 of the loom, and an output signal θs2 of an arithmetic unit 36, which will be described later. An injection command signal A for ejecting from the 24 and a drive command signal B for driving the solenoid 26 to unwind the weft 12 from the locking pin 22 are generated. The solenoid valve 28 is opened by the injection command signal A, and the solenoid 26 is driven by the drive command signal B.

When a fluid such as air or water is ejected from the weft inserting nozzle 24 and the weft 12 is unwound from the locking pin 22, the weft 12 receives the traction force of the fluid ejected from the nozzle 24. As a result, together with the fluid from the nozzle 24, it is weft-inserted into the opening of the warp (not shown), is again locked to the locking pin 22, and is then struck by the reed 38 before the weave. At the time of weft insertion, the part of the weft thread wound around the drum 20 is the nozzle 24 at the tip side of the weft thread 12.
By receiving the traction force from the fluid ejected from
It is pulled out one by one.

The weft inserting nozzle 24 is a so-called main nozzle. If the weft inserting device 18 includes one or more sub-nozzles along the reed 38, the timing controller 30
Further generates an injection command signal for the sub-nozzle based on the output signal θ of the encoder 34 and the output signal θs2 of the arithmetic processing unit 36, and opens the solenoid valve for the sub-nozzle by the injection command signal for the sub-nozzle. Let

The braking device 40 for braking the weft 12 at the end of the weft insertion is provided with three braking members 42, 44 and 46 through which the weft 12 is successively passed. Braking members 42, 44, 46
Are arranged in that order between the length measuring and storage device 16 and the weft inserting device 18, and at the end of the weft insertion, the braking member 44 arranged at the center is moved by the pulse motor 48 to the other braking members 42, When the weft yarn 12 is displaced in a direction intersecting with the weft yarn 12, for example, in the direction of an arrow, the weft yarn 12 is bent, thereby acting as a braking mechanism for braking the weft yarn 12.

However, instead of the illustrated braking mechanism, for example, as described in Japanese Utility Model Laid-Open No. 62-166283, the weft is pressed against the drum of the length-measuring storage device by a holding plate to brake the weft. Braking mechanism, Japanese Utility Model Publication No. 63-24146 and Japanese Patent Publication No. 3-50019
Other types of braking mechanisms may be used, such as a braking mechanism for braking the weft by bending the weft with a pin, as described in Japanese Patent Publication No. 1993-242242.

The motor 48 is a brake controller 50.
It is controlled by a drive command signal C output from. The brake controller 50 outputs the output signal θ of the encoder 34.
And a drive command signal C based on various parameters set in the setting circuit 52 and an output signal D of a pulse generator 54 that generates a number of pulse signals corresponding to the rotation amount of the motor 48. The drive command signal C is supplied to the amplifier / driver 56 for the motor 48.

The parameters set in the setting circuit 52 are
Brake stroke B that regulates the amount of movement of the braking member 44
L and the angle θB1 of the braking on timing to start braking
And an angle θB2 of the braking off timing for ending the braking. The angles θB1 and θB2 are respectively determined by the spindle 32 when the braking is started and when the braking is ended.
The rotation angle can be

The brake controller 50 starts the encoder 3 from the time when the output signal (rotational angle of the main shaft 32) θ of the encoder 34 coincides with the braking-on timing angle θB1.
The drive command signal C for displacing the braking member 44 by the distance corresponding to the brake stroke BL is output to the driver 5 until the output signal .theta.
Supply to 6.

The driver 56 rotates the motor 48 upon receiving the drive command signal C, and moves the braking member 44 to a position displaced by a distance corresponding to the brake stroke BL based on the output signal D of the pulse generator 54. maintain.

The arithmetic unit 36 uses output signals of a plurality of photoelectric sensors 58 and 60 for detecting the weft yarn 12. In the illustrated example, the photoelectric sensors 58 and 60 are arranged in the reed 38 at intervals in the flight direction of the weft 12, and the locking pin 2 is also provided.
It is arranged on the side opposite to the yarn feeding side so that the weft yarn 12 immediately before being locked by the yarn 2 can be detected.

The output signals of the photoelectric sensors 58 and 60 are supplied to the speed calculation circuit 62 of the arithmetic unit 36. Based on the output signals of the photoelectric sensors 58 and 60, the speed calculation circuit 62, when the weft 12 is locked to the locking pin 22, particularly the flying speed of the weft 12 immediately before being locked to the locking pin 22. To calculate. The calculation of the flying speed in the speed calculation circuit 62 is performed, for example, because the distance between the photoelectric sensors 58 and 60 is unchanged.
This can be performed based on the difference in timing of weft detection by both photoelectric sensors 58 and 60.

The flying speed (actual value) V calculated by the speed calculation circuit 62 is supplied to the deviation calculation circuit 64. The deviation calculation circuit 64 calculates a deviation ΔV between the target value V 0 of the weft flying speed output from the target value generation circuit 66 and the actual value V calculated by the speed calculation circuit 62, and the calculated deviation ΔV
Is supplied to the correction amount calculation circuit 68.

The correction amount calculation circuit 68 calculates the deviation ΔV based on the deviation ΔV.
A weft-insertion start angle correction amount ΔθS necessary for correcting the braking time is calculated, and the calculated correction amount ΔθS is supplied to the weft-insertion start angle calculation circuit 70. The weft-insertion start angle calculation circuit 70 calculates a new weft-insertion start angle θS2 based on the initial value θS1 of the weft-insertion start angle set in the setter 72 and the correction amount ΔθS calculated by the correction amount calculation circuit 68. The weft insertion start angle θS2 thus calculated is supplied to the timing controller 30 of the weft insertion device 18. ΔθS, θS1 and θ
S2 can be a value corresponding to the rotation angle of the main shaft 32.

The timing controller 30 uses the new weft-insertion start angle θS2 supplied from the weft-insertion start-angle calculation circuit 70 and the output signal θ of the encoder 34 to generate an injection command signal for the next weft insertion. The rise time of A and the drive command signal C is changed to the weft insertion start angle θS2.
As a result, the next weft insertion start time is corrected by a value corresponding to the correction amount ΔθS with respect to the current weft insertion start time.

The weft insertion start timings are the injection start timing of the fluid from the weft insertion nozzle 24 and the retracting timing of the locking pin 22. Further, the weft insertion start time may be corrected by delaying the weft insertion start time when the weft flying speed becomes fast and advancing it when it becomes late.

Referring to FIG. 2, the jet loom 1 described above is used.
The operation of 0 will be described in more detail.

It is assumed that the weft is flying in the state shown by the flight line. At this time, the weft has an angle θ which is an initial value.
By starting to fly at S1 and being braked from the angle θB1, the speed is reduced to the target speed V0 and then locked by the locking pin. The fluid for weft insertion is started to be injected at the initial angle θS1, and the locking pin is retracted at the same time. The flight speed of the weft when the weft is locked by the locking pin can be expressed as the inclination of the tangent line of the flight line with respect to the time immediately before the tip of the weft reaches the arrival position.

In the subsequent weft insertion cycle, it is assumed that the flight speed of the weft yarn increases as shown by the flight line. At this time, although the timing at which the tip of the weft reaches the anti-feeding side is earlier, the timing at which the braking device operates is constant at the angle θB1, so the braking time for the weft is reduced and the weft is at the target speed. It is locked to the locking pin before it is decelerated to V0.

Therefore, since the flying speed V calculated by the speed calculation circuit 62 becomes faster than the target speed VO, the first deviation calculation circuit 64 outputs the corresponding deviation ΔV and the correction amount calculation circuit 64. Outputs a correction amount ΔθS corresponding to the deviation ΔV, and the weft-insertion start angle calculation circuit 70 outputs a new weft-insertion start angle θS2 that delays the subsequent weft-insertion start timing by a time corresponding to the correction amount ΔθS.

As a result, the timing controller 30
Generates an injection command signal A and a braking command signal B when the rotation angle of the main shaft reaches a new weft-insertion start angle θS2. As a result, the weft insertion start timing is delayed by the correction amount ΔθS, the weft runs in the condition shown by the flight line in FIG. 2 and is braked from the angle θB1, so the braking time becomes longer and the weft After the speed is reduced to the target speed, it is locked by the locking pin, and the impact acting on the weft at that time is relieved.

Thereafter, when the flying speed V deviates from the target speed VB due to a change in the weft flying speed, the correction amount calculation circuit 68 sets the previous change amount ΔθS so as to eliminate the deviation ΔV. Fix it. Deviation ΔV and correction amount ΔθS
Is calculated every weft insertion cycle or every plural weft insertion cycles.

When the flight speed of the weft yarn at the final stage of weft insertion decreases, conversely to the above, the weft insertion start time is advanced and the period in which the braking force acts on the weft yarn is shortened. In this case, the impact when the weft thread is locked by the locking pin has an excessively small value before the weft insertion start time is advanced, but the weft insertion start time is advanced and the braking force is applied during the operation period. By shortening, the size is increased to the extent that thread breakage does not occur. As a result, the flight speed of the weft thread is not decelerated to an extremely low value, so that it is possible to prevent the occurrence of yarn breakage when the weft thread is locked without making the weft insertion unstable.

In the embodiment shown in FIG. 1, the photoelectric sensor for detecting the weft yarn in order to obtain the weft flying speed when the weft yarn is locked by the locking pin is arranged in the flight path on the counter-feed side. Not only that, it may be arranged at another part of the flight path so as to detect the weft during flight, or it may be arranged at the length measurement storage device so as to detect the weft unwound from the length measurement storage device. .

Referring to FIG. 3, photoelectric sensors 102, 1
Reference numeral 04 denotes an unwinding sensor which winds the weft 12 around the drum 20 in order to detect the weft 12 unwound from the drum 20 of the length measurement storage device 16 and which is arranged at intervals in the rewinding direction (arrow direction in the drawing). Is. The photoelectric sensors 102 and 104 respectively receive light rays from the light emitting elements 106 and 108 arranged on the opposite side with respect to the drum 20, and sense the weft threads by blocking the light rays.

In the example shown in FIG. 3, when the weft yarn for one winding of the drum is unwound, the weft yarn interrupts two adjacent light beams a total of four times, so that a total of four photoelectric sensors 102 and 104 are used. An output signal will be obtained.

As shown in FIG. 4A, assuming that the locking pin 22 unwinds the weft 12 at time t1 and locks the weft 12 at time t2, the output signals of both photoelectric sensors 102 and 104 are output. The combined signal becomes the signal shown in FIG. 4 (B), and braking is applied to the weft yarn 12 immediately before time t2 as shown in FIG. 4 (C). As a result, the flying state of the weft yarn 12 is such that the position of its tip is As shown in (D) of the figure, the moving state is set.

In FIG. 4, one pick length of the weft yarn 12 is the drum 2
The length of the weft yarn 12 is 0 to 0, and when the weft yarn 12 is detected during the unwinding of the fourth roll, the locking pin 22 moves to the locking position, and then the weft yarn 12 is locked. 22 is shown as engaging. Therefore, the flying speed of the weft yarn can be measured based on the signals output from the photoelectric sensors 102 and 104 immediately before the weft yarn 12 is engaged with the locking pin 22.

Referring to FIG. 5, the jet loom 80
When the weft 12 is locked to the locking pin 22, the weft 1
Based on the tension acting on No. 2, correct the subsequent weft insertion start time. Therefore, the jet loom 80 is
Is used as an electromagnetic actuator whose position is controlled by the brake controller 50, and the braking member 44 of the braking device 40 is used as a locking member by the motor 48.

In the jet loom 80, the weft 12
Means that the braking member 44 is driven by the motor 48 to the other braking member 4
By being displaced in a direction intersecting with the weft yarns 2 and 46, braking is applied. After that, when the weft 12 is engaged with the locking pin 22, the tension of the weft 12 is applied to the braking member 4.
Act on 4. As a result, the braking member 44 is displaced, and the displacement is transmitted to the motor 48, so that the rotational position of the motor 48 changes.

The change in the rotational position of the motor 48 is detected by the brake controller 50 based on the output signal of the pulse generator 54. As a result, the change in the rotational position of the motor 48 and the displacement of the braking member 44 due to the tension are eliminated. A correction current that flows to the motor 48 flows to the motor 48, and the motor 48, and thus the braking member 44, is returned to a predetermined position. For this reason,
The jet loom 80 detects the tension of the weft 12 at the final stage of weft insertion based on the correction current.

The current supplied from the driver 56 to the motor 48 is measured by the cooperation of the current measuring device 84 and the current measuring circuit 86. Current measuring device 84 of arithmetic unit 82
Is shown differently from computing device 82 for purposes of simplicity of the drawing, but is actually located in connection with computing device 82.

The current value measured by the current measuring circuit 86 is supplied to the tension calculating circuit 88. Tension calculation circuit 8
Reference numeral 8 calculates the tension from the peak value of the correction current or the current amount from the current value supplied from the current measuring circuit 86.
For this purpose, the tension calculation circuit 88 also receives a monitoring timing signal generated in the timing signal generation circuit 90 based on the output signal θ of the encoder 34.

Calculation of the tension in the tension calculation circuit 88 is performed by
It is executed by the following method.

As shown in FIG. 6, the braking member 44 is displaced by the motor 48 whose position is controlled by the brake controller 50 so as to brake the weft 12 during the time T1 to T6 of the weft insertion end timing. Originally,
The braking member 44 is displaced to the operating position between T1 and T2,
Maintained in its operating position from T2 to T5, and from T5 to T
It reverses to the return position between 6 and.

However, in actuality, the weft thread 12 in flight is locked by the locking pin 22 at T3, and the tension of the weft thread 12 acts on the braking member 44, so that the braking member 44 in FIG. As shown in (A), it is displaced from T3 to T4.

Therefore, the brake controller 50 is
The motor 48 is rotated to return the braking member 44 to the actuated position under position control. At this time, the drive current for driving the motor 48 and the output signal of the current measuring circuit 86 is
It changes as shown in FIG. In FIG. 6B, the drive current between T3 and T4 is a correction current for eliminating the displacement of the braking member 44 caused by the tension.

The tension calculation circuit 88 supplies the correction current of the drive current shown in FIG. 6B output from the current measurement circuit 86 from the timing signal generation circuit 90.
It is extracted using the monitoring timing signal shown in (C). The monitoring timing signal is preset so as to be output during the period in which the braking member 44 is in the operating position and the period including the timing in which the weft 12 engages with the locking pin 22.

The peak value of the correction current and the amount of current are proportional to the amount of displacement of the braking member 44 and thus the tension of the weft yarn 12.
Therefore, the tension at the end of weft insertion is, as shown in FIG. 7A, a peak value detection circuit that detects the peak value of the drive current during the time T3 and T4 during the period when the monitoring timing signal is input. And, as shown in FIG. 7B, during time T3 and T4 during the period when the monitoring timing signal is input,
By providing the tension calculation circuit 88 with an integration circuit for integrating the drive current, the peak value or the current amount of the correction current can be measured.

Referring again to FIG. 5, the tension calculation circuit 88.
The tension (actual value) F calculated in (4) is supplied to the first deviation calculation circuit 92. The deviation calculation circuit 92 calculates a deviation ΔF between the target value F0 of the weft tension output from the target value generation circuit 94 and the actual value F calculated by the tension calculation circuit 88, and calculates the calculated deviation ΔF as a correction amount. Supply to the circuit 96.

The correction amount calculation circuit 96 calculates the correction amount based on the deviation ΔF.
A weft-insertion start angle correction amount ΔθS necessary for correcting the braking time is calculated, and the calculated correction amount ΔθS is supplied to the weft-insertion start angle calculation circuit 98. The weft insertion start angle calculation circuit 98 is similar to the weft insertion start angle calculation circuit 70 of FIG.
Initial value of weft insertion start angle set in the setting device 100 θS1
And the correction amount ΔθS calculated by the correction amount calculation circuit 96.
Then, a new weft insertion start angle θS2 is calculated, and the calculated weft insertion start angle θS2 is supplied to the timing controller 30 of the weft insertion device 18.

As in the case of the embodiment of FIG. 1, the timing controller 30 uses the weft insertion start angle θS2 supplied from the weft insertion start angle calculation circuit 98 and the output signal θ of the encoder 34 from the next time onward. The rising times of the injection command signal A and the drive command signal C for weft insertion are changed by a value corresponding to the weft insertion start angle θS2. As a result, the weft insertion start time after the next time is corrected by a value corresponding to the correction amount ΔθS with respect to the current weft insertion start time.

The target value V0 of the flying speed and the target value F0 of the tension differ depending on the kind of weft. Therefore, when the weft used for weaving is changed, it is preferable to supply the deviation calculating circuits 64 and 92 with a target value according to the type of the weft.

In the embodiment shown in FIGS. 1 and 5, the target value generating circuits 66 and 94 respectively input a target value for a corresponding target value for each yarn type and a target value input circuit for inputting the input target value. Memory to store at a predetermined address for each,
In order to output a predetermined target value from the memory, a weft type setting circuit that sets a yarn type to be used and outputs an address signal according to the yarn type, and a target value corresponding to the set yarn type is stored in the memory. A target value output circuit that updates the stored content to its target value each time it is output from, and outputs the stored content to the corresponding deviation calculation circuit.

As the weft thread type setting circuit, it is possible to use a circuit for setting a thread type signal corresponding to the thread type each time the type of thread used is changed.

Similarly, the initial value θS1 of the start time of weft insertion
Also depends on the type of weft. Therefore, when the weft used for weaving is changed, it is preferable to supply an initial value corresponding to the type of the weft from the setter to the weft insertion angle calculation circuit. The setters 72 and 100 can also include a target value input circuit, a memory, a weft type setting circuit, and a target value output circuit, like the target value generation circuits 66 and 94 described above.

The braking force applied to the weft also differs depending on the type of weft. Therefore, when the weft used for weaving is changed, it is preferable to supply the target values BL, θB1, θB2 corresponding to the type of the weft from the setting circuit 52 to the brake controller 50 each time the weft is changed. Such a setting circuit 52 also includes the above-mentioned target value generation circuits 66 and 94.
Similarly, the target angle input circuit, the memory, the weft type setting circuit, and the target angle output circuit can be used.

In the embodiments shown in FIGS. 1 and 5, the weaving is performed using monochromatic wefts. However, in the case of multicolor weaving, braking devices are respectively applied to a plurality of yarn types. Is provided.

In the case of multicolor weaving, the length measurement storage device 1
6, weft insertion device 18 and timing controller 30
Is also provided for each of the plurality of wefts. Therefore, the target value generation circuits 66, 94 and the setters 72, 100 are
Upon receiving the weft selection signal supplied from the weft selection command device (not shown) for determining the weft insertion yarn, the target values V0, F0 corresponding to the weft insertion yarn type are constructed.
And an initial value θS1 is generated. Further, the weft-insertion start angle calculation circuits 70 and 98 calculate a new weft-insertion start angle θS2 by receiving the correction amount ΔS, and also receive the yarn type selection signal to correspond to the selected yarn type. Weft insertion start angle θS "in timing controller 30
Is output.

A loom is provided with a device having a locking pin 114 swingable in the weft inserting direction and a motor 116 for rotating the locking pin, as in the length measurement storage device 112 shown in FIG. The lock pin 1 to detect the tension
14 and the motor 116 can be used as a braking member (locking member) for locking the weft and a position-controlled electromagnetic actuator, respectively.

In the surveying storage device 112 shown in FIG.
The locking pin 114 locks the weft 12 when rotated to the position shown by the solid line, and unwinds the weft 12 by being angularly rotated to the position shown by the two-dot chain line. Such a surveying storage device 112 is described, for example, in Japanese Utility Model Publication No. 3-1503. When the weft thread 12 is engaged with the locking pin 114, the locking pin 114 is slightly displaced in the weft inserting direction by the tension of the weft thread 12. Position-controlled motor 116
Is controlled to eliminate this displacement, which causes a correction current to flow. By detecting this correction current, the tension when the weft 12 is locked by the locking pin 114 can be obtained.

When the weft insertion start timing is controlled based on the tension of the weft, the tension of the weft is controlled by a strain gauge, a piezoelectric element or the like as described in, for example, Japanese Patent Laid-Open No. 61-113895. It may be detected.

Instead of the motor 48 or 116, another electric motor, a solenoid mechanism such as a rotary solenoid and a reciprocating solenoid, or the like may be used as the drive source or the electromagnetic actuator of the braking device 40.

In any of the above embodiments, the correction amount calculation circuits 68 and 96 uniquely determine the correction amount ΔS for eliminating the deviations ΔV and ΔF, and the weft insertion start angle calculation circuits 70 and 9 are obtained.
8 uniquely calculated a new weft insertion start angle θS2. However, the correction amount Δ for eliminating the deviations ΔV and ΔF
Instead of uniquely obtaining θS, a predetermined constant change amount may be output depending on whether the deviations ΔV and ΔF are positive or negative. In this case, the correction amount calculation circuit is configured by a circuit that outputs a constant change amount corresponding to the positive / negative of the deviation each time a speed deviation or a tension deviation occurs, and a circuit that integrates the output of the circuit. The output may be output to the weft insertion angle calculation circuit as the correction amount ΔθS.

Further, different correction amounts may be used depending on the fluid injection start timing and the locking pin retreat timing, and the weft insertion start timing may be corrected by either the fluid injection start timing or the locking pin retreat timing. You may correct only one. In this case, in any case, it is preferable to set the injection start timing of the fluid from the weft insertion nozzle sufficiently before the start timing of the retracting of the locking pin. That is, during the control, even if the start timing of the retracting of the locking pin is made earliest, the injection start timing of the fluid from the weft inserting nozzle may be earlier than the start timing of the retracting of the locking pin. desirable.

[Brief description of drawings]

FIG. 1 is a block diagram of an electric circuit showing an embodiment of a jet loom of the present invention.

FIG. 2 is a diagram for explaining the operation of the jet loom of FIG.

FIG. 3 is a diagram showing another embodiment of the photoelectric sensor.

4 is a diagram showing a waveform of an electric signal when the photoelectric sensor of FIG. 3 is used.

FIG. 5 is a block diagram of an electric circuit showing another embodiment of the jet loom of the present invention.

6 is a diagram showing a waveform of an electric signal in the braking device shown in FIG.

FIG. 7 is a diagram showing an embodiment of a tension calculation circuit.

FIG. 8 is a diagram showing another embodiment of the length measurement storage device.

[Explanation of symbols]

 10 Jet Loom 12 Weft 16 Measuring Length Storage Device 18 Weft Inserting Device 22 Locking Pin 24 Nozzle for Weft Inserting 26 Solenoid for Locking Pin 28 Solenoid Valve 32 Spindle Main Spindle 34 Encoder 36 Computing Device 38 Reed 40 Braking Device 48 Motor 58 , 60 photoelectric sensor 64 deviation calculation circuit 70 weft insertion start angle calculation circuit 80 jet loom 84 current detector 92 deviation calculation circuit 98 weft insertion start angle calculation circuit 106, 108 photoelectric sensor 112 length measuring storage device 114 locking pin (braking member ) 116 motor

Claims (5)

[Claims] 1. A weft insertion device that unwinds the weft thread wound around a storage drum by retracting a locking pin, and weft-inserts the unwound thread into the opening of the warp by a weft insertion nozzle. In a jet loom including a braking device that operates at different timings and brakes a flying weft, a calculation for calculating a flying speed or a tension of the weft when the weft is locked by the locking pin. A jet loom comprising: means and a control means for calculating a subsequent weft insertion start time based on the value calculated by the calculation means and controlling the weft insertion device based on the calculated start time. 2. The control means controls a retraction start timing of the locking pin and a fluid injection start timing from the weft insertion nozzle based on the calculated start timing.
The jet loom according to claim 1. 3. The injection start timing of the fluid from the weft insertion nozzle is set before the start timing of the retraction of the locking pin, and the control means is based on the calculated start timing. The jet loom according to claim 1, wherein the start timing of the retraction of the stop pin is controlled. 4. The weft yarn just before the weft yarn is locked to the locking pin based on output signals of a plurality of photoelectric sensors arranged at intervals to detect the weft yarn. And a second calculation circuit for obtaining a deviation between the target value of the flight speed and the flight speed obtained by the first calculation circuit. Is provided with a controller that calculates a weft insertion start time at the time of subsequent weft insertion based on the deviation obtained by the second calculation circuit, and controls the weft insertion device based on the calculated start time. The jet loom according to Item 1. 5. The calculation means comprises a measuring circuit for measuring the tension of the weft when the weft is locked by the locking pin, a target value of the tension and a tension measured by the measuring circuit. A calculation circuit for determining the deviation of the braking force, the control means calculates a weft insertion start time at the time of subsequent weft insertion based on the deviation calculated by the calculation circuit, and the braking is performed based on the calculated start time. A controller for controlling the mechanism,
The jet loom according to claim 1.