JPH06184867A - Control device of weft of weaving machine - Google Patents

Abstract

PURPOSE:To facilitate fixing operation of an arm to a driving source, setting operation of the arm at an initial place and changing operation of the arm. CONSTITUTION:A control device of weft of weaving machine comprises a driving source to be controlled in position, an arm which is rocked between an initial position and a control position by the driving source and controls weft, a stopper with which the arm can be brought into contact, a first treating circuit for generating a first command signal to move the arm until the arm is brought into contact with a stopper when an electric source is applied and then starting a second command signal to move the arm to an initial position corresponding to a set value capable of changing the arm, a second treating circuit for generating a third and forth command signals to reciprocate the arm between the initial position and the control position by the command of reversed rotation and the command of normal rotation and a driving circuit for rotating the driving source based on the first, second, third and forth command signals and controlling the position of the driving source.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weaving machine for controlling a weft yarn by an arm such as a brake lever, a pullback lever and a retaining pin, such as a weft braking device, a weft retracting device and a swinging retaining pin device. Of the weft control device.

[0002]

2. Description of the Related Art 1 of weft control devices used in looms
As an example, a so-called arm such as a brake lever, a pull-back lever, a locking pin, etc., which swings in response to an angular reciprocating rotary motion of a drive source such as an electric motor, is included, and the weft is controlled by the swinging motion of the arm. There is something to do. In this type of weft control device, since the stop position of the drive source is not constant when the power to the loom is turned off, the position of the arm with respect to the weft differs each time the power is turned on. In such a device, since the initial position of the arm (the position at which the arm starts moving for controlling the weft) is different each time the power is turned on, the timing at which the arm contacts the weft, the timing at which the arm separates from the weft, Weft control amount (brake,
The bending amount for pulling back, locking, etc. changes every time the power is turned on, and as a result, the weft cannot be controlled accurately.

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

However, in the conventional device using the sensed piece and the sensor, the initial position differs depending on the relative positional relationship between the sensed member and the arm with respect to the output shaft of the drive source, and therefore the drive for driving the arm. The initial position cannot be accurately set unless the arm is correctly attached to the predetermined position of the shaft, and the initial position must be adjusted by adjusting the mounting position of the arm on the drive shaft. Therefore, in the conventional device, 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 it thereafter are complicated.

[0005]

An object of the present invention is to facilitate the work of assembling the arm to the drive source and the work of setting and changing the initial position of the arm.

[0006]

A weft control device of the present invention includes 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 the weft, and the arm. And a first command signal for generating a first command signal for moving the arm until it abuts on the stopper when the power is turned on, and then the initial value corresponding to a changeable set value. Second to move to the position
A first processing circuit for generating a command signal of the above, and third and fourth command signals for reciprocating the arm between the initial position and the control position by receiving the reverse rotation command and the forward rotation command. A second processing circuit that occurs and the first and second
And a drive circuit that rotates the drive source based on second, third, and fourth command signals and that controls the position of the drive source.

When the power of the loom is turned on, the drive source is rotated in the normal direction until the arm comes into contact with the stopper, and then is rotated by a predetermined angle. As a result, the arm is moved from the position where it abuts the stopper to the initial position. After that, the drive source is reversely rotated by a predetermined amount each time the reverse rotation command is generated, and is normally rotated by the same angle as that at the time of the reverse rotation each time the normal rotation command is generated. As a result, the arm is moved from the initial position to the control position and vice versa. In this way, the initial position is the 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, the initial position with respect to the weft can be changed by changing the set value.

According to the present invention, when the power is turned on, the arm is moved until it abuts on the stopper and then to the initial position corresponding to the changeable set value. The initial position can be adjusted simply by changing it, and as a result, the setting and changing work of the initial position becomes easy, and the work of assembling the arm to the drive source becomes easy.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, a control mechanism 10 of a weft control device is assembled with a main nozzle 14 and an auxiliary nozzle 16 for inserting a weft 12 into a shed of a warp, and a weft. It is used as a braking mechanism of a weft braking device that brakes 12. The weft 12 is supplied from the length measurement storage device (not shown) to the auxiliary nozzle 16 and the main nozzle 1.
4 has been penetrated.

The control mechanism 10 includes a drive source 18 capable of controlling an angular rotational position like a pulse motor, an arm 20 moved by the drive source to bend a weft, and a stopper 22 with which the arm can contact. Including and

The drive source 18 is attached to the main nozzle 14 with a plurality of screws (not shown) and is an L-shaped support member 23. The arm 20 has the main nozzle 14 and the auxiliary nozzle 16 in the flying direction of the weft 12. It is supported so that it may be placed between and.

The arm 20 includes a base portion 26 attached to the output shaft of the drive source 18, that is, the drive shaft 24, and an arm portion 28 attached to the base portion. The base portion 26 is attached to the output shaft 24 by a plurality of screws (not shown) so that the arm portion 28 swings across the flight path of the weft yarn 12, and the drive source 18 makes an angular reciprocating rotary motion. Is given. 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 indirectly driven by the drive source 18.

The arm portion 28 has a shape obtained by bending an elongated member, for example, a linear member into a U-shape so that both ends thereof form a pair of base end portions, and at the base end portion, the base portion 2 is formed.
It is attached to 6 different places. The attachment points of the linear members to the base portion 26 are separated by a predetermined distance in the flight direction of the weft yarn 12. However, the attachment positions of the linear members on the base portion 26 may be separated in a direction intersecting with the flight direction of the weft yarn 12.

The stopper 22 has a plate-like shape extending above the arm portion 28 in the flight direction of the weft yarns 12, and also supports the main nozzle 14 and an auxiliary member so that the arm portion 28 can abut on the lower surface. It is attached to the nozzle 16 by a plurality of screws 30. As shown in FIG. 2, the shock absorbing member 32 may be provided on the lower surface of the stopper 22, and the shock or noise when the arm 20 collides with the stopper 22 may be reduced by the shock absorbing member 32.

The control mechanism 10 further includes an auxiliary member 34 for increasing the control force applied to the weft yarn 12. The auxiliary member 34 has a shape in which an elongated member is bent into a U-shape so that both ends thereof form a pair of base end portions, and the base members of the stopper 22 extend downward from the stopper 22. Installed in.

The lower end of the auxiliary member 34 is at the arm 20.
It is arranged at a position where it can be received by the arm portion 28 with the swinging motion of the. The weft 12 has a main nozzle 14
The auxiliary member 34 passes between the auxiliary nozzle 34 and the auxiliary nozzle 16.

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 residual magnetism of the drive source 18, the arm 20 may not fall 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 indefinite.

When the power of the loom is turned on, the drive source 18
Is rotated forward. This causes arm 20 to move to position 20.
The position 20 at which the arm portion 28 contacts the stopper 22 from a
It is rotated angularly towards b.

Next, when the arm portion 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 drive source 1
8 is rotated in the reverse direction by an angle θ1 each time a reverse rotation command is generated, and is rotated in the normal direction by an angle θ1 each time a normal rotation command is generated. As a result, the arm 20 moves from the position 20c to the position 20c.
moved up to 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 forward rotation and the reverse rotation of the drive source 18 when the power is turned on are performed each time the power of the loom is turned on.
As a result, 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 yarn 12 is bent by the cooperative action of the arm 20 and the auxiliary member 34, and the weft yarn 12 at the position 20d has the reference numeral 1.
It is curved to the position indicated by 2a.

When the auxiliary member 34 is used like the control mechanism 10, 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 bar shape may be used. Further, like the control mechanism 36 shown in FIG. 3, the tip of the arm 20 is placed in the hole 40 formed in the frame 38 of an arbitrary device, and the hole 4
A part 42 of the surface defining 0 may be used as a stopper. It should be noted that what is shown in the drawing is a swinging type locking pin mechanism, and the arm, that is, the locking pin 20 in this example is the 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, the 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 that generates first and second command signals when the power is turned on, and third and fourth command signals by receiving a reverse rotation command and a forward rotation command. And a second processing circuit 54 for generating
Alternatively, it includes a drive circuit 56 that rotates the drive source 18 based on the fourth command signal, and an encoder 58 that generates a pulse signal PG0 each time the drive source 18 rotates a predetermined angle.

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

The oscillator 62 raises the pulse signal from when it receives the detection signal S1 to when it receives the contact signal S2 which means that the arm 20 has contacted the stopper 22.
It is supplied to the addition terminal of the down counter 66. The flip-flop 64 is set by the detect signal S1 and reset by the contact signal S2 to provide the Q output to the switch 68. The switch 68 is closed while the flip-flop 64 is set, and the encoder 5
The output signal PG0 of 8 is supplied to the subtraction terminal of the counter 66.

Therefore, from the time the power of the loom is turned on until the arm 20 abuts the stopper 22,
The oscillator 62 outputs a pulse signal, and the flip-flop 6
4 is set. The count value of the counter 66 is the output signal PG0 of the encoder 58 that is 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 in the digital / analog converter 72, and the analog signal is supplied to the 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 the first command signal.

When the power of the loom is turned on, the detection signal S
Since 1 is generated and the contact signal S2 is generated when the arm 20 contacts the stopper 22, the drive circuit 56
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. As a result, the drive source 18 is normally rotated 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 the fact that the current flowing through the drive source 18 changes rapidly when the arm 20 contacts the stopper 22. As such a circuit,
For example, a current detector 78 that detects the current supplied from the drive circuit 56 to the drive source 18 based on the secondary side current of the current transformer 76 arranged in the current supply path to the drive source 18, and the current detector 78. It is possible to use a comparator circuit 80 which compares the detection signal of the container with the threshold value set in the threshold value setting device 82 and generates the contact signal S2 when the former is the latter or more.

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

Upon receiving the contact signal S2, the oscillator 84 supplies a pulse signal corresponding to the value set in the θ0 setter 88 to the subtraction terminal of the up / down counter 90. The flip-flop 86 is set by the contact signal S2 and reset by the output signal of the zero detector 92 which detects that the count value of the counter 90 has become zero, and supplies the Q output to the switch 94. While the flip-flop 90 is set, the switch 94
The output signal PG0 of the encoder 58 is closed and supplied to the addition terminal of the counter 90.

The value set in the setter 88 is the value of the arm 20.
From the position 20b where the arm 22 abuts the stopper 22
Initial position 20c where 0 starts moving for controlling the weft
It is a value corresponding to the rotation angle θ 0 of the drive source 18 required to move the arm 20 until the arm 20 moves to. Setting device 8
The set value of 8 can be changed manually. Setting device 8
The set value of 8 may be a pulse signal of the encoder 58 corresponding to the rotation angle θ 0 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 thereto is built in the setter 88.

In the oscillator 84, the arm 20 has a stopper 22.
As a result of the contact with, the pulse signal corresponding to the value set in the setter 88 is started to be generated. The flip-flop 86 is set until the arm 20 moves from the position 20b where the arm 20 is in contact with 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 PG0 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 the digital / analog converter 96, and the analog signal is supplied to the 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 the second command signal.

As a result, the drive circuit 56 causes the arm 20 to
The drive source 18 is driven based on the second command signal supplied from the switch 96 until the oscillator 84 finishes generating the pulse signal corresponding to the set value of the setter 88 after the contact with the stopper 22. Let As a result, the drive source 18
Moves the arm 20 to the initial position 20c,
It is reversed.

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

The value set in the setter 104 is the arm 2
0 is a value corresponding to the rotation angle θ1 of the drive source 18 required to move the arm 20 until the arm 20 moves from the initial position 20c to the control position 20d. The set value of the setter 104 can be manually changed. The set value of the setter 104 may be a pulse signal of the encoder 58 corresponding to the rotation angle θ1 of the drive source 18, or may be the rotation angle θ1 of the drive source 18. In the latter case, the setter 104 has a built-in circuit that converts the set rotation angle θ1 into the number of pulse signals of the encoder 58 corresponding to this.

The output signal PG0 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 rotation command signal is supplied, and the output signal PG0 of the encoder 58 is output.
Are supplied to the counter 106. Therefore, the counter 10
The count value of 6 is input to the counter 106 by the encoder 5
It corresponds to the difference between the total number of eight output signals PG0 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 the digital / analog converter 112, and the analog signal is supplied to the switch 114. The switch 114 is closed while the reverse rotation command signal is supplied, and supplies the analog signal from the converter 112 to the drive circuit 56 as the third command signal.

As a result, in the drive circuit 56, each time the reverse rotation command signal is generated, the oscillator 100 ends the generation of the pulse signal corresponding to the set value of the setting device 104 from the time when the reverse rotation command signal is generated. Until, 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.

The output signal PG0 of the encoder 58 is supplied to the subtraction terminal of the counter 108 via the switch 116. The switch 116 is closed while the forward rotation command signal is supplied, and the output signal PG0 of the encoder 58 is output.
Is supplied to the counter 108. Therefore, the counter 10
The count value of 8 is input to the counter 108 by the encoder 5
It corresponds to the difference between the total number of eight output signals PG0 and the total number of pulse signals from the oscillator 102.

The count value of the counter 108 is converted into an analog signal in the digital / analog converter 118, and the analog signal is supplied to the switch 120. The switch 120 is closed while the normal rotation command signal is supplied, and supplies the analog signal from the converter 118 to the drive circuit 56 as a fourth command 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 each time the normal rotation instruction signal is generated, from the time when the normal rotation instruction signal is generated. Until the end, the drive source 18 is driven based on the fourth command signal supplied from the switch 120. As a result, the drive source 18 is normally rotated 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 V0 of the first and second processing circuits 52, 54 and a converter. The first combining circuit section 124 for combining the output signal Va of the first and second 122, the speed amplifier 126 for amplifying the output signal of the first combining circuit section, the output signal of the speed amplifier and the secondary of the current transformer 76. Second to combine side current value
This is a well-known position controllable circuit including a combination circuit section 128 and a current amplifier 130 that amplifies an output signal of the second combination circuit section. 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 output from the switch 74 to the drive circuit. 56. Thereby,
The drive circuit 56 causes the drive source 18 to rotate normally, and the arm 20 is moved from the position 20a to 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 causes the drive source 18 to rotate forward by the angle θ 0 corresponding to the value set in the setter 88, and the arm 20 is moved from the position 20b to the initial position 20c.

The control circuit 50 moves the arm 20 to the initial position 20c by performing the above operation each time the power of the loom is turned on. The initial position 20c can be adjusted by changing the set value of the setter 88.
Therefore, the setting and changing work of the initial position 20c becomes easy. Moreover, 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 type of loom,
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, the third command signal is first supplied from the switch 114 to the drive circuit 56, and then the third command signal is supplied. The fourth command signal is the 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 device 104, and then causes the drive source 18 to rotate the angle θ1 corresponding to the value set in the setting device 104.
Only rotate forward.

As a result, the arm 20 is first moved from the initial position 20c to the control position 20d and then from the control position to the initial position 20c each time the reverse rotation command signal and the normal rotation command signal are sequentially generated. . The control position 20d with respect to the initial position 20c can be adjusted by changing the set value of the setter 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, which means that the arm 20 has contacted the stopper 22, may be generated by the circuit shown in FIG. The circuit shown in FIG.
When the former is less than the latter, the signal S is compared with the value set in
2 is generated from the comparator 132. F / V converter 122
The output signal of indicates the rotation speed of the drive source 18, so that when it becomes less than or equal to a threshold value set to zero, for example,
Generate signal S2.

Alternatively, the signal S2 may be generated by the circuit shown in FIG. The circuit shown in FIG. 6 outputs the output signal PG0 of the encoder 58 to a time constant T longer than the cycle of the signal PG0.
Is supplied to the re-trigger type one-shot multivibrator 134 as a trigger signal, and the output signal of the one-shot multivibrator 134 is supplied to the knot circuit 136.
And the rising edge of the output signal of the knot circuit 136 is taken as the signal S2. The waveform of the signal and the time constant T in the circuit shown in FIG. 6 are shown in FIG. When the drive source 18 is stopped, the signal PG0 is not 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, but instead of this, for example, the position 2
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 moves the arm 20 in the normal direction to the position 20c, which is the control position, based on the fourth command signal generated in response to the normal rotation command, and receives the third command generated in response to the reverse rotation command signal. Arm 2 based on the command signal of
0 will be reversed to the position 20c which is an initial position.

[Brief description of 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.

2 is a view taken along line 2-2 in FIG. 1. FIG.

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

FIG. 4 is a block diagram showing an 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 that generates a signal indicating that the arm has contacted the stopper.

FIG. 6 is a block diagram showing still another embodiment of a circuit that generates a signal indicating that the arm is in contact with the stopper.

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

[Explanation of symbols]

10 Weft control device control mechanism 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 contacting stopper 20c Initial position 20d Control position 50 Weft control circuit of weft control device S1 Detection signal that the power is turned on S2 Arm contact signal that means that the arm contacts the stopper

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[Procedure amendment]

[Submission date] March 30, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction content]

[Document name] Statement

Title: Weft control device for loom

[Claims]

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weaving machine for controlling a weft yarn by an arm such as a brake lever, a pullback lever and a retaining pin, such as a weft braking device, a weft retracting device and a swinging retaining pin device. Of the weft control device.

[0002]

2. Description of the Related Art 1 of weft control devices used in looms
As an example, a so-called arm such as a brake lever, a pull-back lever, a locking pin, etc., which swings in response to an angular reciprocating rotary motion of a drive source such as an electric motor, is included, and the weft is controlled by the swinging motion of the arm. There is something to do. In this type of weft control device, since the stop position of the drive source is not constant when the power to the loom is turned off, the position of the arm with respect to the weft differs each time the power is turned on.

In such an apparatus, since the initial position of the arm (the position at which the arm starts to move for controlling the weft) is different each time the power is turned on, the timing at which the arm contacts the weft and the arm from the weft Timing to leave,
The control amount of the weft (the amount of bending for braking, pulling back, locking, etc.) changes each time the power is turned on, and as a result, the weft cannot be controlled accurately.

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

However, in the conventional device using the sensed piece and the sensor, the initial position differs depending on the relative positional relationship between the sensed member and the arm with respect to the output shaft of the drive source, and therefore the drive for driving the arm. The initial position cannot be accurately set unless the arm is correctly attached to the predetermined position of the shaft, and the initial position must be adjusted by adjusting the mounting position of the arm on the drive shaft. Therefore, in the conventional device, 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 it thereafter are complicated.

[0006]

An object of the present invention is to facilitate the work of assembling the arm to the drive source and the work of setting and changing the initial position of the arm.

[0007]

A weft control device of the present invention includes 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 the weft, and the arm. And a first command signal for generating a first command signal for moving the arm until it abuts on the stopper when the power is turned on, and then the initial value corresponding to a changeable set value. Second to move to the position
A first processing circuit for generating a command signal of the above, and third and fourth command signals for reciprocating the arm between the initial position and the control position by receiving the reverse rotation command and the forward rotation command. A second processing circuit that occurs and the first and second
And a drive circuit that rotates the drive source based on second, third, and fourth command signals and that controls the position of the drive source.

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

Thus, the initial position is the 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, the initial position with respect to the weft can be changed by changing the set value.

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 to the initial position corresponding to the changeable set value. The initial position can be adjusted simply by changing it, and as a result, the setting and changing work of the initial position becomes easy, and the work of assembling the arm to the drive source becomes easy.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, a control mechanism 10 of a weft control device is assembled with a main nozzle 14 and an auxiliary nozzle 16 for inserting a weft 12 into a shed of a warp, and a weft. It is used as a braking mechanism of a weft braking device that brakes 12. The weft 12 is supplied from the length measurement storage device (not shown) to the auxiliary nozzle 16 and the main nozzle 1.
4 has been penetrated.

The control mechanism 10 has a drive source 18 capable of controlling an angular rotational position like a pulse motor, an arm 20 moved by the drive source to bend a weft, and a stopper 22 with which the arm can abut. Including and

The drive source 18 includes an L-shaped support member 23 attached to the main nozzle 14 by a plurality of screws (not shown), and an arm 20 in the flight direction of the weft 12 in which the main nozzle 14 and the auxiliary nozzle 16 are arranged. It is supported so that it may be placed between and.

The arm 20 includes a base portion 26 attached to the output shaft of the drive source 18, that is, the drive shaft 24, and an arm portion 28 attached to the base portion. The base portion 26 is attached to the output shaft 24 by a plurality of screws (not shown) so that the arm portion 28 swings across the flight path of the weft yarn 12, and is angularly reciprocally rotated by the drive source 18. Exercise is given. 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 indirectly driven by the drive source 18.

The arm portion 28 has a shape obtained by bending an elongated member, for example, a linear member into a U-shape so that both ends thereof form a pair of base end portions, and at the base end portion, the base portion 2 is formed.
It is attached to 6 different places. The attachment points of the linear members to the base portion 26 are separated by a predetermined distance in the flight direction of the weft yarn 12. However, the attachment positions of the linear members on the base portion 26 may be separated in a direction intersecting with the flight direction of the weft yarn 12.

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

The control mechanism 10 further includes an auxiliary member 34 for increasing the control force applied to the weft yarn 12. The auxiliary member 34 has a shape in which an elongated member is bent into a U-shape so that both ends thereof form a pair of base end portions, and the base members of the stopper 22 extend downward from the stopper 22. Installed in.

The lower end of the auxiliary member 34 is at the arm 20.
It is arranged at a position where it can be received by the arm portion 28 with the swinging motion of the. The weft 12 has a main nozzle 14
The auxiliary member 34 passes between the auxiliary nozzle 34 and the auxiliary nozzle 16.

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 residual magnetism of the drive source 18, the arm 20 may not fall 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 indefinite.

When the power of the loom is turned on, the drive source 18
Is rotated forward. This causes arm 20 to move to position 20.
The position 20 at which the arm portion 28 contacts the stopper 22 from a
It is rotated angularly towards b.

Next, when the arm portion 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.

The drive source 1 while the power of the loom is turned on.
8 is reversely rotated by an angle θ1 each time a reverse rotation command is generated, and is normally rotated by an angle θ1 every time a normal rotation command is generated. As a result, the arm 20 moves from the position 20c to the position 20c.
moved up to 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 forward 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.
As a result, 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 yarn 12 is bent by the cooperative action of the arm 20 and the auxiliary member 34, and the weft yarn 12 at the position 20d has the reference numeral 1.
It is curved to the position indicated by 2a.

If the auxiliary member 34 is used like the control mechanism 10, 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 bar shape may be used. Further, like the control mechanism 36 shown in FIG. 3, the tip of the arm 20 is placed in the hole 40 formed in the frame 38 of an arbitrary device, and the hole 4
A part 42 of the surface defining 0 may be used as a stopper. It should be noted that what is shown in the drawing is a swinging type locking pin mechanism, and the arm, that is, the locking pin 20 in this example is the 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, the 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 that generates first and second command signals when the power is turned on, and third and fourth command signals by receiving a reverse rotation command and a forward rotation command. And a second processing circuit 54 for generating
Alternatively, it includes a drive circuit 56 that rotates the drive source 18 based on the fourth command signal, and an encoder 58 that generates a pulse signal PGO each time the drive source 18 rotates by a predetermined angle.

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

The oscillator 62 raises the pulse signal from when it receives the detection signal S1 until it receives the contact signal S2 which means that the arm 20 has contacted the stopper 22.
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
The output signal PGO of 8 is supplied to the subtraction terminal of the counter 66.

Therefore, from the time the power of the loom is turned on until the arm 20 abuts the stopper 22,
The oscillator 62 outputs a pulse signal, and the flip-flop 6
4 is set. The count value of the counter 66 is the output signal PGO of the encoder 58 that is 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 in the digital / analog converter 72, and the analog signal is supplied to the 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 the 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, the drive circuit 56
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. As a result, the drive source 18 is normally rotated 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 the fact that the current flowing through the drive source 18 changes rapidly when the arm 20 contacts the stopper 22. As such a circuit,
For example, a current detector 78 that detects the current supplied from the drive circuit 56 to the drive source 18 based on the secondary side current of the current transformer 76 arranged in the current supply path to the drive source 18, and the current detector 78. It is possible to use the comparator circuit 80 which compares the detection signal of the container with the threshold value set in the threshold value setting device 82 and generates the contact signal S2 when the former is the latter or more.

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

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

The value set in the setter 88 is the value of the arm 20.
From the position 20b where the arm 22 abuts the stopper 22
Initial position 20c where 0 starts moving for controlling the weft
It is a value corresponding to the rotation angle θ0 of the drive source 18 required to move the arm 20 until it moves to. Setting device 8
The set value of 8 can be changed manually. Setting device 8
The set value of 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 this is built in the setter 88.

In the oscillator 84, the arm 20 has a stopper 22.
As a result of the contact with, the pulse signal corresponding to the value set in the setter 88 is started to be generated. The flip-flop 86 is set until the arm 20 moves from the position 20b where the arm 20 is in contact with 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 the digital / analog converter 96, and the analog signal is supplied to the 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 the second command signal.

As a result, the drive circuit 56 causes the arm 20 to
The drive source 18 is driven based on the second command signal supplied from the switch 96 until the oscillator 84 finishes generating the pulse signal corresponding to the set value of the setter 88 after the contact with the stopper 22. Let As a result, the drive source 18
Moves the arm 20 to the initial position 20c,
It is reversed.

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

The value set in the setter 104 is the arm 2
0 is a value corresponding to the rotation angle θ1 of the drive source 18 required to move the arm 20 until the arm 20 moves from the initial position 20c to the control position 20d. The set value of the setter 104 can be manually changed. The set value of the setter 104 may be a pulse signal of the encoder 58 corresponding to the rotation angle θ1 of the drive source 18, or may be 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 thereto is built in the setter 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 rotation command signal is supplied, and the output signal PGO of the encoder 58 is closed.
Are supplied to the counter 106. Therefore, the counter 10
The count value of 6 is input to the counter 106 by the encoder 5
It corresponds to the difference between the total number of eight 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 the digital / analog converter 112, and the analog signal is supplied to the switch 114. The switch 114 is closed while the reverse rotation command signal is supplied, and supplies the analog signal from the converter 112 to the drive circuit 56 as the third command signal.

As a result, in the drive circuit 56, each time the reverse rotation command signal is generated, the oscillator 100 ends the generation of the pulse signal corresponding to the set value of the setting device 104 from the time when the reverse rotation command signal is generated. Until, 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.

The output signal PGO of the encoder 58 is supplied to the subtraction terminal of the counter 108 via the 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
The count value of 8 is input to the counter 108 by the encoder 5
It corresponds to the difference between the total number of eight 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 in the digital / analog converter 118, and the analog signal is supplied to the switch 120. The switch 120 is closed while the normal rotation command signal is supplied, and supplies the analog signal from the converter 118 to the drive circuit 56 as a fourth command 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 each time the forward rotation command signal is generated, from when the forward rotation command signal is generated. Until the end, the drive source 18 is driven based on the fourth command signal supplied from the switch 120. As a result, the drive source 18 is normally rotated so as to move the arm 20 from the control position 20d to the initial position 20c.

The drive circuit 56 converts the frequency of the pulse signal output from the encoder 58 into a voltage value, the F / V converter 122, the output signals VO of the first and second processing circuits 52 and 54, and the converter. The first combining circuit section 124 for combining the output signal Va of the first and second 122, the speed amplifier 126 for amplifying the output signal of the first combining circuit section, the output signal of the speed amplifier and the secondary of the current transformer 76. Second to combine side current value
This is a well-known position controllable circuit including a combination circuit section 128 and a current amplifier 130 that amplifies an output signal of the second combination circuit section. 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. Therefore, the first command signal is output from the switch 74 to the drive circuit. 56. Thereby,
The drive circuit 56 causes the drive source 18 to rotate normally, and the arm 20 is moved from the position 20a to 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. Thereby, the drive circuit 56 causes the drive source 18 to rotate forward by the angle θ0 corresponding to the value set in the setter 88, and the arm 20 is moved from the position 20b to the initial position 20c.

The control circuit 50 performs the above-mentioned operation each time the power of the loom is turned on to move the arm 20 to the initial position 20c. The initial position 20c can be adjusted by changing the set value of the setter 88.
Therefore, the setting and changing work of the initial position 20c becomes easy. Moreover, 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 type of loom,
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 with the arm 20 maintained at the initial position 20c, the third command signal is first supplied from the switch 114 to the drive circuit 56, and then the third command signal is supplied. The fourth command signal is the switch 1
20 to the drive circuit 56. As a result, the drive circuit 56 first reverses the drive source 18 by the angle θ1 corresponding to the value set in the setting device 104, and then causes the drive source 18 to rotate the angle θ1 corresponding to the value set in the setting device 104.
Only rotate forward.

As a result, the arm 20 is first moved from the initial position 20c to the control position 20d and then from the control position to the initial position 20c each time the reverse rotation command signal and the normal rotation command signal are sequentially generated. . The control position 20d with respect to the initial position 20c can be adjusted by changing the set value of the setter 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, which means that the arm 20 has contacted the stopper 22, may be generated by the circuit shown in FIG. The circuit shown in FIG.
When the former is less than the latter, the signal S is compared with the value set in
2 is generated from the comparator 132. F / V converter 122
The output signal of indicates the rotation speed of the drive source 18, so that when it becomes less than or equal to a threshold value set to zero, for example,
Generate signal S2.

Further, the signal S2 may be generated by the circuit shown in FIG. The circuit shown in FIG. 6 outputs the output signal PGO of the encoder 58 to a time constant T longer than the period of the signal PGO.
Is supplied to the re-trigger type one-shot multivibrator 134 as a trigger signal, and the output signal of the one-shot multivibrator 134 is supplied to the knot circuit 136.
And the rising edge of the output signal of the knot circuit 136 is taken as the signal S2. The waveform of the signal and the time constant T in the circuit shown in FIG. 6 are shown in FIG. When the drive source 18 is stopped, the signal PGO is not 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, but instead of this, for example, the position 2 is set.
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 moves the arm 20 in the normal direction to the position 20c, which is the control position, based on the fourth command signal generated in response to the normal rotation command, and receives the third command generated in response to the reverse rotation command signal. Arm 2 based on the command signal of
0 will be reversed to the position 20c which is an initial position.

The bending amount of the weft 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 described in detail. Is the main nozzle 14
This can be changed by changing the distance between the weft yarn inlet and the nozzle tip portion (not shown) of the auxiliary nozzle 16. According to the former, when the rotation angle θ1 is changed, the time for the arm portion 28 to bend the weft 12 changes, but according to the latter, even if the nozzle interval is changed, the time is not affected. Is effective for controlling.

The structure for changing the nozzle interval is as follows.
For example, the auxiliary nozzle 16 may be provided to the stopper 22 so that the position of the auxiliary nozzle 16 can be controlled 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. Alternatively, the auxiliary nozzle 16 may be slidably attached to the stopper 22 and position control may be automatically performed by a dedicated drive source. of course,
The main nozzle 14 may be configured as described above. The auxiliary nozzle 16 may not be a weft insertion nozzle, but may be a threading nozzle for simply threading the auxiliary member 34.

In the above embodiment, the two nozzles 14, 1
The weft thread 12 stretched on the No. 6 is bent by an arm guide. If the distance between the yarn guides can be adjusted, the bending amount can be similarly changed.

[Brief description of 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.

2 is a view taken along line 2-2 in FIG. 1. FIG.

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

FIG. 4 is a block diagram showing an 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 that generates a signal indicating that the arm has contacted the stopper.

FIG. 6 is a block diagram showing still another embodiment of a circuit that generates a signal indicating that the arm is in contact with the stopper.

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

[Explanation of symbols] 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 Position of arm when power is off 20b When a stopper is contacted Arm position 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 that means arm has contacted stopper

Claims (1)

[Claims] 1. A drive source whose position is controlled, an arm which swings between an initial position and a control position by the drive source to control a weft, a stopper with which the arm can abut, and a power source is turned on. Generates a first command signal for moving the arm until it abuts the stopper, and then generates a second command signal for moving the arm to the initial position corresponding to a changeable set value. And a second processing circuit for generating 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 forward rotation command. A weft control device for a loom, comprising: a processing circuit; and a drive circuit that rotates the drive source based on the first, second, third, and fourth command signals and that controls the position of the drive source.