JP3115439B2 - Weft control device of loom - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loom in which a weft is controlled by arms such as a brake lever, a pull-back lever and a locking pin, such as a weft braking device, a weft retraction device, and a swing type locking pin device. A weft control device.

[0002]

2. Description of the Related Art One of weft control devices used in a loom.
One of them includes a so-called arm such as a brake lever, a pull-back lever, and a locking pin that swings in response to an angular reciprocating rotational movement of a driving source such as an electric motor. The weft is controlled by the swinging movement of the arm. There is something to do. In this type of weft control device, the stop position of the drive source when the power to the loom is turned off is not constant, so the position of the arm with respect to the weft is different each time the power is turned on.

In such a device, the initial position of the arm (the position at which the arm starts to move for controlling the weft) differs every time the power is turned on. When to leave,
The control amount of the weft (bending amount for braking, pulling back, locking, etc.) changes every time the power is turned on, and as a result, the weft cannot be accurately controlled.

As one of the weft control devices for solving the above problem, a dog, that is, a sensed piece is attached to an output shaft of a drive source for an arm, and the sensed piece is sensed by a sensor.
There is one that positions the arm at an initial position using the sensing signal of the sensor (Japanese Utility Model Publication No. 3-54146). In this conventional device, the drive source is rotated when the power is turned on, and when the detected piece is detected by the sensor, the drive source is stopped, and the angular rotation position of the drive source at that time is set as the initial position.

However, in the conventional apparatus using the sensed piece and the sensor, the initial position differs according to the relative position of the sensed member and the arm with respect to the output shaft of the drive source. If the arm is not accurately mounted at a predetermined position on the shaft, the initial position cannot be set accurately, and the initial position must be adjusted by adjusting the mounting position of the arm on the drive shaft. For this reason, in the conventional apparatus, the work of assembling the arm to the drive shaft is complicated, and the work of setting the initial position and the work of changing the initial position are complicated.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to facilitate the work of assembling an arm to a drive source and the work of setting and changing the initial position of the arm.

[0007]

A weft control device according to the present invention comprises: a drive source whose position is controlled; an arm which is swung between an initial position and a control position by the drive source to control a weft; Generates a first command signal to move the arm when the power is turned on until the arm comes into contact with the stopper, and then generates the first command signal corresponding to the set value at which the arm can be changed. Move to the second position
And a third and fourth command signals for reciprocating the arm between the initial position and the control position by receiving a reverse rotation command and a normal rotation command. Generating a second processing circuit;
A drive circuit for rotating the drive source based on second, third and fourth command signals, and for controlling the position of the drive source.

When the power of the loom is turned on, the drive source is rotated forward until the arm comes into contact with the stopper, and then rotated reversely by a predetermined angle. As a result, the arm is moved from the position where it comes into contact with the stopper to the initial position. Thereafter, the drive source is reversely rotated by a predetermined amount each time a reverse rotation instruction is generated, and is rotated forward by the same angle as that at the time of reverse rotation each time a forward rotation instruction is generated. As a result, the arm is moved from the initial position to the control position and vice versa.

As described above, the initial position is a movement start position when the arm controls the weft. Since the rotation amount of the drive source based on the second command signal is determined by the set value, the distance from the stopper to the initial position is determined by the set value. Therefore, by changing the set value, the initial position with respect to the weft can be changed.

According to the present invention, when the power is turned on, the arm is moved until it comes into contact with the stopper, and then moved to the initial position corresponding to the set value that can be changed. The initial position can be adjusted only by changing the position, and as a result, the operation of setting and changing the initial position is facilitated, and the operation of assembling the arm to the drive source is facilitated.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, a control mechanism 10 of a weft control device is mounted on a weft insertion main nozzle 14 and an auxiliary nozzle 16 for causing a weft 12 to fly to an opening of a warp. It is used as a braking mechanism of a weft braking device that applies a brake to the motor 12. The weft 12 is supplied from the length measuring storage device (not shown) to the auxiliary nozzle 16 and the main nozzle 1.
4 is penetrated.

The control mechanism 10 includes a drive source 18 capable of controlling an angular rotation position such as a pulse motor, an arm 20 which is moved by the drive source to bend the weft, and a stopper 22 which the arm can contact. And

The drive source 18 includes an L-shaped support member 23 attached to the main nozzle 14 with a plurality of screws (not shown). Are supported so as to be disposed between the

The arm 20 includes a base 26 attached to the output shaft of the drive source 18, that is, the drive shaft 24, and an arm 28 attached to the base. The base 26 is assembled to the output shaft 24 by a plurality of screws (not shown) so that the arm 28 swings across the trajectory of the weft 12. Be given exercise. Instead of directly attaching the arm 20 to the shaft 24 of the drive source 18, the arm 20 may be attached to another drive shaft that is indirectly driven by the drive source 18.

The arm portion 28 has a shape in which an elongated member, for example, a linear member is bent in a U-shape so that both ends thereof become a pair of base ends.
It is attached to six different locations. The attachment points of the linear members to the base 26 are separated by a predetermined distance in the flight direction of the weft 12. However, the location where the linear member is attached to the base 26 may be separated in a direction crossing the flight direction of the weft 12.

The stopper 22 has a plate-like shape extending above the arm 28 in the direction in which the weft 12 travels. The stopper 22 supports the main nozzle 14 so that the arm 28 can contact the lower surface. A plurality of screws 30 are attached to the nozzle 16. As shown in FIG. 2, the impact absorbing member 32 may be provided on the lower surface of the stopper 22, and the impact or noise when the arm 20 collides with the stopper 22 may be reduced by the impact absorbing member 32.

The control mechanism 10 further includes an auxiliary member 34 for increasing the control force applied to the weft 12. The auxiliary member 34 has a shape in which an elongated member is bent in a U-shape so that both ends thereof become a pair of base ends, and the base member is attached to the stopper 22 so as to extend downward from the stopper 22. It is installed in.

The lower end of the auxiliary member 34 is
It is arranged at a position that can be received by the arm portion 28 with the swinging motion of. The weft 12 is attached to the main nozzle 14
And between the auxiliary nozzle 16 and the auxiliary nozzle 34.

As shown in FIG. 2, when the power of the loom is not turned on, the arm 20 is rotated by its own weight to a position 20a apart from the auxiliary member 34 so as to extend downward from the output shaft 24. However, due to the tension of the weft 12 and the presence of residual magnetism of the driving source 18, the arm 20 does not drop to the position 20a and may stay at a position between the positions 20a and 20b. In any case, the position of the arm 20 when the power is not turned on is undefined.

When the power of the loom is turned on, the drive source 18 is turned on.
Is turned forward. As a result, the arm 20 is moved to the position 20.
a from which the arm portion 28 contacts the stopper 22
Rotated angularly toward b.

Next, when the arm 28 comes into contact with the stopper 22, the drive source 18 is reversed by the angle θ0. As a result, the arm 20 is rotated from the position code 20b by the angle θ0 and moved to the position 20c.

While the power of the loom is turned on, the driving source 1
8 is reversely rotated by an angle θ1 each time a reverse rotation instruction is issued, and is rotated forward by an angle θ1 each time a forward rotation instruction is issued. As a result, the arm 20 moves from the position 20c to the position 20c.
d and vice versa. Thus, position 2
0c acts as a movement start position when the arm 20 controls the weft 12, that is, an initial position.

The normal rotation and the reverse rotation of the drive source 18 when the power is turned on are performed every time the power of the loom is turned on.
Thus, the arm 20 is positioned at the initial position 20c every time the power of the loom is turned on.

When the arm 20 is rotated to the position 20d, the weft 12 is bent by the cooperative action of the arm 20 and the auxiliary member 34.
It is bent to the position shown by 2a.

The use of the auxiliary member 34 as in the control mechanism 10 has the advantage that the braking force acting on the weft 12 is large, but the auxiliary member 34 may not be used. Further, instead of the arm having the U-shaped arm portion, an arm having another shape such as a plate shape or a rod shape may be used. Further, as in a control mechanism 36 shown in FIG. 3, the distal end of the arm 20 is arranged in a hole 40 formed in a frame 38 of an arbitrary device, and
A part 42 of the surface defining 0 may be used as a stopper. The figure shows a swing-type locking pin mechanism. The arm, that is, the locking pin 20 in this example is a frame of the length measuring and storing device, that is, the hole 4 of the drum 38 in this example.
It is configured to be able to go in and out of 0.

Referring to FIG. 4, a control circuit 50 of the weft control device is used for controlling the rotation of the drive source 18. The control circuit 50 includes a first processing circuit 52 for generating first and second command signals when the power is turned on, and a third and fourth command signals for receiving the reverse rotation command and the normal rotation command. , A second processing circuit 54 for generating the first, second, and third
Alternatively, it includes a driving circuit 56 that rotates the driving source 18 based on the fourth command signal, and an encoder 58 that generates a pulse signal PGO every time the driving source 18 rotates by a predetermined angle.

The first processing circuit 52 receives the AC supplied from the commercial AC power supply to the loom to the detector 60, and detects that the power of the loom is turned on. The detection signal S1 of the detector 60 is supplied to an oscillator 62 that generates a pulse signal of a constant frequency as an oscillation start signal, and is also supplied to a set input terminal S of the flip-flop 64 as a signal for setting the flip-flop 64.

The oscillator 62 increases the pulse signal from when the detection signal S1 is received until the contact signal S2 indicating that the arm 20 contacts the stopper 22 is received.
It is supplied to the addition terminal of the down counter 66. The flip-flop 64 is set by the detection signal S1 and reset by the contact signal S2, and supplies the Q output to the switch 68. The switch 68 is closed while the flip-flop 64 is set, and the encoder 5 is closed.
8 is supplied to the subtraction terminal of the counter 66.

Therefore, from when the power of the loom is turned on to when the arm 20 comes into contact with the stopper 22,
The oscillator 62 outputs a pulse signal, and outputs
4 is set. Further, the count value of the counter 66 is determined by the output signal PGO of the encoder 58 input to the counter 66.
And the total number of pulse signals from the oscillator 62.

The count value of the counter 66 is converted into an analog signal by a digital / analog converter 72, and the analog signal is supplied to a switch 74. Switch 74
Is closed while the flip-flop 64 is set, and supplies the analog signal from the converter 72 to the drive circuit 56 as a first command signal.

When the power of the loom is turned on, the detection signal S
1 is generated and the contact signal S2 is generated when the arm 20 contacts the stopper 22.
Drives the drive source 18 based on the first command signal supplied from the switch 74 from when the power of the loom is turned on until the arm 20 contacts the stopper 22. Thus, the drive source 18 is rotated forward until the arm 20 contacts the stopper 22 when the power of the loom is turned on.

The contact of the arm 20 with the stopper 22 can be detected, for example, by utilizing a sudden change in the current flowing through the drive source 18 when the arm 20 contacts the stopper 22. As such a circuit,
For example, a current detector 78 that detects a current supplied from the drive circuit 56 to the drive source 18 based on a secondary current of the current transformer 76 disposed in a current supply path to the drive source 18, A comparison circuit 80 that compares the detection signal of the detector with the threshold set in the threshold setting device 82 and generates the contact signal S2 when the former is equal to or greater than the latter can be used.

The contact signal S2 is supplied as an oscillation start signal to an oscillator 84 that generates a pulse signal of a constant frequency, and is supplied to a set input terminal S of the flip-flop 86 as a signal for setting the flip-flop 86. You.

Upon receiving the contact signal S2, the oscillator 84 supplies a pulse signal corresponding to the value set in the θ0 setting unit 88 to the subtraction terminal of the up / down counter 90. The flip-flop 86 is set by the contact signal S2, is reset by the output signal of the zero detector 92 detecting that the count value of the counter 90 has become zero, and supplies the Q output to the switch 94. The switch 94 operates while the flip-flop 90 is set.
After being closed, the output signal PGO of the encoder 58 is supplied to the addition terminal of the counter 90.

The value set in the setting device 88 is
From the position 20b where the arm 2 is in contact with the stopper 22.
0 is the initial position 20c where movement starts for weft control
Is a value corresponding to the rotation angle θ0 of the drive source 18 necessary to move the arm 20 until the arm 20 moves. Setting device 8
The setting value of 8 can be changed manually. Setting device 8
8 may be a pulse signal of the encoder 58 corresponding to the rotation angle θ0 of the drive source 18 or the drive source 1
The rotation angle θ0 may be eight. In the latter case, a circuit for converting the set rotation angle θ0 into the number of pulse signals of the encoder 58 corresponding to the rotation angle θ0 is built in the setting unit 88.

The oscillator 84 includes an arm 20 having the stopper 22
, The generation of a pulse signal corresponding to the value set in the setting unit 88 is started. The flip-flop 86 is set until the arm 20 moves from the position 20b where the arm 20 contacts the stopper 22 to the initial position 20c. Further, the count value of the counter 90 corresponds to the difference between the total number of output signals PGO of the encoder 58 input to the counter 90 and the total number of pulse signals from the oscillator 84.

The count value of the counter 90 is converted into an analog signal in a digital / analog converter 96, and the analog signal is supplied to a switch 98. Switch 98
Is closed while the flip-flop 86 is set, and supplies the analog signal from the converter 96 to the drive circuit 56 as a second command signal.

As a result, the driving circuit 56
Drives the drive source 18 based on the second command signal supplied from the switch 96 until the oscillator 84 completes generation of the pulse signal corresponding to the set value of the setter 88 from the time when the switch comes into contact with the stopper 22. Let it. Thereby, the driving source 18
Moves the arm 20 to the initial position 20c,
Reversed.

The second processing circuit 54 receives a reverse rotation command signal having a fixed time width at a predetermined time by the oscillator 100 and a normal rotation command signal having a fixed time width to the oscillator 102. While receiving the reverse command signal, the oscillator 100
A pulse signal corresponding to the value set in the 1 setter 104 is supplied to the subtraction terminal of the up / down counter 106. While receiving the forward rotation command signal, the oscillator 102
A pulse signal corresponding to the value set in the 1 setter 104 is supplied to the addition terminal of the up / down counter 108.

The value set in the setting device 104 is
0 is a value corresponding to the rotation angle θ1 of the drive source 18 necessary to move the arm 20 from the initial position 20c to the control position 20d. The set value of the setting device 104 can be changed manually. The set value of the setting unit 104 may be a pulse signal of the encoder 58 corresponding to the rotation angle θ1 of the drive source 18 or the rotation angle θ1 of the drive source 18. In the latter case, a circuit for converting the set rotation angle θ1 into the number of pulse signals of the encoder 58 corresponding to the rotation angle θ1 is built in the setting unit 104.

The output signal PGO of the encoder 58 is supplied to the addition terminal of the counter 106 via the switch 110. The switch 110 is closed while the reverse command signal is supplied, and the output signal PGO of the encoder 58 is closed.
Is supplied to the counter 106. Therefore, the counter 10
6 is input to the counter 106 by the encoder 5
8 corresponds to the difference between the total number of output signals PGO and the total number of pulse signals from the oscillator 100.

The count value of the counter 106 is converted into an analog signal in a digital / analog converter 112, and the analog signal is supplied to a switch 114. The switch 114 is closed while the reverse command signal is being supplied, and supplies the analog signal from the converter 112 to the drive circuit 56 as a third command signal.

As a result, the drive circuit 56 causes the oscillator 100 to end the generation of the pulse signal corresponding to the set value of the setting unit 104 from the time when the reverse command signal is generated every time the reverse command signal is generated. Until the above, the drive source 18 is driven based on the third command signal supplied from the switch 114. Thereby, the drive source 18 is reversed so as to move the arm 20 from the initial position 20c to the control position 20d.

An output signal PGO of the encoder 58 is supplied to a subtraction terminal of the counter 108 through a switch 116. The switch 116 is closed while the forward rotation command signal is supplied, and the output signal PGO of the encoder 58 is closed.
Is supplied to the counter 108. Therefore, the counter 10
8 is input to the counter 108 by the encoder 5
8 corresponds to the difference between the total number of output signals PGO and the total number of pulse signals from the oscillator 102.

The count value of the counter 108 is converted into an analog signal by a digital / analog converter 118, and the analog signal is supplied to a switch 120. The switch 120 is closed while the forward rotation instruction signal is being supplied, and supplies the analog signal from the converter 118 to the drive circuit 56 as a fourth instruction signal.

As a result, the drive circuit 56 causes the oscillator 102 to generate a pulse signal corresponding to the set value of the setter 104 every time the forward rotation command signal is generated, from the time when the forward rotation command signal is generated. Until the end, the driving source 18 is driven based on the fourth command signal supplied from the switch 120. Thereby, the drive source 18 is rotated forward so as to move the arm 20 from the control position 20d to the initial position 20c.

The drive circuit 56 includes an F / V converter 122 for converting the frequency of the pulse signal output from the encoder 58 into a voltage value, an output signal VO from the first and second processing circuits 52 and 54, and a converter. 122, a speed amplifier 126 for amplifying the output signal of the first synthesis circuit unit, and a secondary circuit of the current amplifier 76 and the output signal of the speed amplifier. The second to combine the side current value
This is a known position-controllable circuit including a combining circuit unit 128 of FIG. 1 and a current amplifier 130 that amplifies an output signal of the second combining circuit unit. The output of the current amplifier 130 is supplied to the drive source 18 via the current transformer 76.

In the control circuit 50, when the power of the loom is turned on, first, the detection signal S1 is generated from the detector 60 of the first processing circuit 52, so that the first command signal is transmitted from the switch 74 to the drive circuit. 56. Thereby,
The drive circuit 56 rotates the drive source 18 forward, and the arm 20 is moved from the position 20a toward the position 20b.

Next, when the arm 20 comes into contact with the stopper 22, the contact signal S2 is generated from the comparator 80, so that the second command signal is supplied from the switch 98 to the drive circuit 56. As a result, the drive circuit 56 rotates the drive source 18 forward by the angle θ0 corresponding to the value set in the setting device 88, and the arm 20 is moved from the position 20b to the initial position 20c.

The control circuit 50 performs the above-described operation each time the power of the loom is turned on, and moves the arm 20 to the initial position 20c. The initial position 20c can be adjusted by changing the set value of the setting device 88.
For this reason, the setting and changing work of the initial position 20c becomes easy. Further, since the set value of the setting device 88 can be set after the arm 20 is assembled to the drive source 18, the work of assembling the arm 20 to the drive source 18 becomes easy. Furthermore, the initial position 20c is set for each loom, for each loom type,
Alternatively, it can be set for each woven fabric to be woven.

When the reverse rotation command signal and the normal rotation command signal are sequentially generated while the arm 20 is maintained at the initial position 20c, a third command signal is first supplied from the switch 114 to the drive circuit 56, and then, The fourth command signal is switch 1
20 to the drive circuit 56. Thereby, the drive circuit 56 first reverses the drive source 18 by the angle θ1 corresponding to the value set in the setting unit 104, and then turns the drive source 18 to the angle θ1 corresponding to the value set in the setter 104.
Just rotate forward.

As a result, each time the reverse rotation command signal and the forward rotation command signal are sequentially generated, the arm 20 is moved from the initial position 20c to the control position 20d, and then from the control position to the initial position 20c. . The control position 20d with respect to the initial position 20c can be adjusted by changing the set value of the setting device 104. Therefore, the control position 20d with respect to the initial position 20c can be set for each loom, for each type of loom, or for each woven fabric to be woven.

The contact signal S2 indicating that the arm 20 has contacted the stopper 22 may be generated by the circuit shown in FIG. The circuit shown in FIG. 5 uses an output signal of the F / V converter 122 in a comparison circuit 132 and a threshold setting device 134.
The signal S is compared with the value set in
2 is generated from the comparator 132. F / V converter 122
Output signal indicates the rotation speed of the drive source 18, and when this falls below a threshold set to, for example, zero,
A signal S2 is generated.

The signal S2 may be generated by the circuit shown in FIG. The circuit shown in FIG. 6 converts the output signal PGO of the encoder 58 into a time constant T longer than the cycle of the signal PGO.
Is supplied as a trigger signal to a re-trigger type one-shot multivibrator 134 having a
And the rising of the output signal of the knot circuit 136 is defined as a signal S2. FIG. 7 shows signal waveforms and time constants T in the circuit shown in FIG. When the drive source 18 stops, the signal PGO is no longer output, so the signal S2 at this time is generated.

In the above embodiment, the initial position of the arm 20 is set to the position 20c.
0d may be set as the initial position, and position 20c may be set as the control position. At this time, the drive circuit 56 causes the arm 20 to move forward to the position 20c, which is the control position, based on the fourth command signal generated in response to the forward rotation command, and generates the third rotation in response to the reverse rotation command signal. Arm 2 based on the command signal of
0 is reversed to the initial position 20c.

The amount of bending of the weft yarn 12 can be changed by changing the rotation angle θ1 of the drive shaft 24. In addition, the rotation angle θ1 is kept constant and the distance between the main nozzle 14 and the auxiliary nozzle 16 is determined in detail. Is the main nozzle 14
This can be changed by changing the distance between the weft yarn inlet and the nozzle tip (not shown) of the auxiliary nozzle 16. According to the former, when the rotation angle θ1 is changed, the time during which the arm portion 28 bends the weft 12 changes. However, according to the latter, changing the interval between the nozzles does not affect the time. It is effective for the control of.

As a configuration for changing the interval between nozzles,
For example, the auxiliary nozzle 16 may be provided so as to be position-controllable with respect to the stopper 22 in the weft insertion direction. That is, the insertion hole of the screw hole 30 formed in the bracket of the stopper 22 may be an elongated hole, and the auxiliary nozzle 16 may be moved together with the square bracket and then fixed. Further, the auxiliary nozzle 16 may be slidably mounted on the stopper 22, and the position may be automatically controlled by a dedicated driving source. of course,
The main nozzle 14 may be configured as described above. The auxiliary nozzle 16 may not be a nozzle for weft insertion, but may simply be a threading nozzle for passing a thread through the auxiliary member 34.

In the above embodiment, the two nozzles 14, 1
6 is bent by an arm guide, but as shown in Japanese Utility Model Publication No. 63-774, in the case of a bending device for bending a weft stretched over a pair of yarn guides, If the distance between the yarn guides can be adjusted, the amount of bending can be similarly changed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a control mechanism used in a weft control device according to the present invention.

FIG. 2 is a view taken along line 2-2 in FIG.

FIG. 3 is a diagram showing another embodiment of the control mechanism used in the weft control device according to the present invention.

FIG. 4 is a block diagram showing one embodiment of a control circuit used in the weft control device according to the present invention.

FIG. 5 is a block diagram showing another embodiment of a circuit for generating a signal indicating that an arm has contacted a stopper.

FIG. 6 is a block diagram showing still another embodiment of a circuit for generating a signal indicating that an arm has come into contact with a stopper.

FIG. 7 is a diagram showing signal waveforms of the embodiment shown in FIG.

[Explanation of symbols]

Reference Signs List 10 control mechanism of weft control device 12 weft 14 main nozzle for weft insertion 16 auxiliary nozzle for weft insertion 18 drive source 20 arm 20a arm position when power is off 20b arm position when abutted on stopper 20c Initial position 20d Control position 50 Weft control circuit of weft control device S1 Detection signal that power is turned on S2 Contact signal indicating that arm has contacted stopper

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) D03D 47/28-47/38

Claims (1)

(57) [Claims] 1. A drive source whose position is controlled, an arm that is swung between an initial position and a control position by the drive source to control the weft, a stopper that the arm can contact, and a power source. Generates a first command signal for moving the arm until it comes into contact with the stopper, and then generates a second command signal for moving the arm to the initial position corresponding to a changeable set value. A first processing circuit that generates third and fourth command signals for reciprocating the arm between the initial position and the control position by receiving a reverse rotation command and a normal rotation command. A weft control device for a loom, comprising: a processing circuit; and a drive circuit that controls the position of the drive source, the drive circuit rotating the drive source based on the first, second, third, and fourth command signals.