JPH06104944B2 - Loom operating method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for operating a loom, and particularly to a method for starting a drive motor.

[Conventional technology]

If the loom stops once during weaving, weaving, that is, stop, tends to occur. The cause of this loom is mainly due to the transient weakening of the beating force when the loom is restarted.

Therefore, for example, in the invention of "a method for preventing a stop step in a loom" disclosed in Japanese Patent Laid-Open No. 59-21751, two idle shots are performed at the time of starting the loom, and then the weft insertion, feeding and winding operations are started. I am trying. However, the prevention method does not solve the problem of the rotation of the loom and the phasing of the fabric structure, and therefore even if the loom reaches an appropriate speed after the loom is started, the loosing is immediately performed due to the phasing. You will not be able to start horizontal insertion.

In addition, the invention of the “soft start method for a loom” in Japanese Patent Laid-Open No. 59-82451 discloses that when the loom is started, the winding motor is temporarily rotated in the opposite direction before the induction motor for driving the loom is started. It is disclosed that the beating force is strengthened in the initial stage of starting the loom by retracting the cloth fell. However, even with the soft start method, since the reverse rotation amount is preset, it is not possible to appropriately cope with the change in the speed of the loom, and the tension control system becomes unstable especially at the initial stage of start-up.

On the other hand, an inverter is used as a means for changing the rotation speed (rotation speed) of the loom. This allows the number of rotations of the loom to be set in a wide range so as to meet the weaving conditions.

However, when the target number of revolutions of the loom changes, the correspondence between the number of revolutions of the loom and the speed pattern after the change, that is, the amount of reverse rotation before starting and the acceleration characteristics at the beginning of startup is broken, and each time the reverse operation before starting is performed, It is necessary to adjust the rotation amount, and it becomes impossible to perform appropriate control.

[Object of the Invention]

Therefore, the object of the present invention is to accurately set the reverse rotation amount of the prime mover before starting according to the target steady-state rotation speed of the loom while maintaining the opening motion which is the main motion of the loom and the synchronization of the prime mover. It is to be able to start the main movement at an appropriate time during normal rotation.

[Means for Solving the Invention]

Therefore, according to the present invention, when the loom is started, the drive motor is rotated in the reverse rotation direction by the reverse rotation amount obtained from the target steady-state rotation speed, the opening device is returned by the reverse rotation amount, and the drive motor is controlled in the subsequent starting process. With the blanking and opening motion of the shaft, it is rotated in the forward direction by the amount of rotation equal to the amount of reverse rotation, and the drive motor is made to reach the steady speed, at which point the main motions, namely the weft insertion motion, the feeding motion and the winding motion, I'm trying to get started.

The weaving machine starts to rotate in the forward direction, and the beating force is sufficiently strengthened by idle driving until the steady number of revolutions is reached. It can be surely prevented.

Moreover, since the weft insertion movement, the feeding movement and the winding movement are performed only after the rotation in the forward direction equal to the reverse rotation amount, there is no movement of the cloth fell (loom), and the weave structure, that is, the opening movement and the main movement of the loom The synchronism is not broken, and thus, unlike the prior art, no more than necessary blanking is required for the mouthpiece adjustment.

〔Example〕

First, FIG. 1 shows an operating device 1 for a loom. The warp yarn 2 is wound around the delivery beam 3, and while forming the opening 6 by the opening device 5 via the tension roll 4, the warp yarn 2 intersects with the weft yarn 7 and is woven as the woven cloth 9 by the beating motion of the reed 8. Go away. And this woven cloth 9 is breast beam 10, take-up roll
After passing through 11 and the guide roll 12, it is wound around the outer periphery of the cloth winding beam 13.

The delivery beam 3 receives a rotational force from a DC delivery motor 14 and sequentially delivers it so as to maintain a predetermined tension. The feed motor 14 is driven by a drive amplifier 15. The tension of this feeding is set by the tension setter 16, and is given to the drive amplifier 15 as an electric signal via the contact 17a of the starting relay 17 and the addition point 18.

On the other hand, the actual tension of the warp yarn 2 is detected by the load cell 19 as an electric signal of the displacement of the tension roll 4, and is applied as a feedback signal to the adding point 18 described above.

The take-up roll 11 is driven by a DC take-up motor 21 controlled by a drive amplifier 20. This take-up motor 21
Since the number of revolutions corresponds to the fabric density, it is set by the fabric density setting device 22, and is given to the drive amplifier 20 as a density command signal via the contact 17b of the starting relay 17 and the addition point 24. The rotation of the take-up roll 11 is detected by the tachogenerator 25, and the addition point 24
Is applied as a feedback signal.

Further, the cloth winding beam 13 is driven by a cloth winding motor 26. The cloth tension setter 27
It is connected to the cloth winding detector 29 on the input side, and is connected to the cloth winding motor 26 via the switch 28, the addition point 30, and the drive amplifier 31 on the output side. The output of the drive amplifier 31 is detected by the current detector 32, and the addition point
Applied as a feedback signal to 30.

The opening device 5 and the locking shaft 33 of the cover 8 are driven by a three-phase induction type drive motor 35 directly or via a clutch 34.
A brake 36 is attached to the output side of the drive motor 35.

The drive motor 35 is driven at a desired rotation speed (rotation speed) by a variable frequency inverter 37. The inverter 37 generates a three-phase output having the frequency set by the speed setter 38, and rotates the drive motor 35 while limiting the target steady rotation speed by this frequency. The speed setting device 38 is also connected to a controller 39 connected to the inverter 37.

The controller 39 is provided to control the forward rotation amount or the reverse rotation amount of the driving motor 35 at the time of starting the loom, and outputs a forward / reverse rotation pulse signal from the operation signal A and the encoder 40 connected to the driving motor 35. After receiving the operation signal A as an input and reversing by a predetermined reverse rotation amount obtained from the target steady-state rotation speed of the drive motor 35, a coincidence signal B is generated,
The start relay 17 is driven.

Further, FIG. 3 shows a controller 39 in connection with the inverter 37.
It shows the internal configuration of the.

The speed setter 38 includes two comparison circuits for reverse rotation control via the V / F converter 42, the AND gate 43, the counter 44, and the latch 45 in order to regulate the amount of reverse rotation at the time of startup and the rotation amount in the forward rotation direction. Four
6, connected to the comparison circuit 47 for normal rotation control. An oscillator 48 having a frequency f is connected to one input end of the AND gate 43, and is also connected to a clear input end of a counter 44 via a one-shot multivibrator 49. Further, a knot circuit 50 and a one-shot multivibrator are connected. It is connected to the latch input terminal of the latch 45 via 51.

On the other hand, the encoder 40 is connected to the above-mentioned comparison circuits 46 and 47 via a counter 55 for reverse rotation control and a counter 56 for forward rotation control via one input terminals of AND gates 53 and 54, respectively. The contact 58a of the reversing relay 58 passes through the knot circuit 59 and the flip-flop 60, and then the AND gate.
The other input terminal of 53 and one-shot multivibrators 61 and 62 are connected to the clear input terminals of the counters 55 and 56, respectively.

Further, the contact 57a for resetting while stopped is connected to the reset input terminals of the flip-flops 64 and 65 via the shaping circuit 63, respectively. The comparison circuits 46 and 47 are respectively connected to the starting relay 17 and the reverse rotation completion relay 68 by knot circuits 66 and 67 via the set input terminals and the output terminals of the flip-flops 64 and 65, respectively.

Next, FIG. 4 shows the sequence circuit 70. The operation switch 71 and the stop switch 72 are connected to the power supply terminal 74 in series together with the operation relay 57. The contact 57b of the operation relay 57 is connected in parallel to the start switch 71. The reverse rotation relay 58 is connected in series to the power supply terminal 74 together with the contacts 68a and 57c. Further, the forward rotation relay 73 is connected to the power supply terminal 74 in series with the contacts 57d and 68b. The contact 73a is connected in parallel with the contact 68b.

Further, FIG. 5 shows a circuit example of the inverter 37.
The three-phase AC power supply 75 is connected to the three-phase induction type drive motor 35 via a converter 76 and an inverter switching circuit 77. On the other hand, the speed setter 38 has a soft start circuit 78,
V / F converter 79, three-phase pseudo sine wave generation circuit 80, duty ratio controller 81 connected to triangular wave oscillation circuit 84, gate processing circuit 82
And inverter 83 via driver 83
It is connected to the. The V / F converter 79 is a V / V adjuster.
It is also connected to the three-phase pseudo sine wave generation circuit 80 via 87. The current detector 85 is an inverter switching circuit.
The output current is detected by the current transformer 86 on the output side of 77,
The operation of the conduction ratio controller 81 is controlled based on this.

Hereinafter, the operation method of the loom of the present invention will be described in relation to the operation of the operation device 1 with reference to FIG.

The target steady speed of the loom is set by the speed setter 38. The speed signal S as the output of the speed setter 38
In addition to the soft start circuit 78 of the inverter 37,
It is also input to the V / F converter 42 of 39. At this time, the steady rotation speed of the drive motor 35 is set to N. If the coefficient is K, it is expressed by the following equation using the speed signal S.

N = K · S [rpm] On the other hand, the output frequency of the V / F converter 42 is given by the following formula, where F is the coefficient and a is the coefficient.

F = KS / a [Hz] For example, when the speed signal S = 6 [V], the target steady speed N
If the constant K is set so that = 600 [rpm], the coefficient K becomes 100 [rpm / V]. At this time, if the coefficient a = 10 and the frequency F = 10 · S [Hz] and the frequency f = 1 [Hz] are set, the content stored in the latch 45 becomes “10S”.

If the encoder 40 of 10 pulses per rotation is used, the content of the latch 45 becomes "60" when the steady rotation speed N = 600 [rpm]. The value of "60" corresponds to 6 rotations of the drive motor 35, that is, 6 picks of the loom, and is input to the comparison circuits 45 and 46 for controlling the rotation amount.

In this way, the stored contents of the latch 45 are obtained from the steady rotation speed N, and correspond to the reverse rotation amount and the forward rotation amount of the drive motor 35 when the loom is started. This steady speed N
When is changed, its contents are automatically changed. The amount of reverse rotation corresponds to the amount of rotation required to reach the steady rotation speed N after the drive motor 35 is rotated in the forward rotation direction.

Here, when the operator sets the operation switch 71 to the ON state for starting the loom, the operation relay 57 turns on the contact 57b for holding the operation switch 57a, and the contact 57a is closed. , 65 are both reset. Immediately after the contact 57c turns on, the reverse rotation relay 5
8 operates and the contact 58a for reverse rotation command is closed,
The flip-flop 60 is set, and the one-shot multivibrators 61 and 62 set the counters 55 and 56 to the clear state. Further, when the contact 58c is closed, a command in the reverse rotation direction is given to the gate processing circuit 82, so that the inverter 37 rotates the driving motor 35 in the reverse rotation direction based on the speed pattern determined by the soft start circuit 78.

By this reverse rotation, the opening device 5 is returned by the reverse rotation amount of 6 picks. Moreover, the reed 8 is separated from the drive system of the drive motor 35 by the clutch 34 during reverse rotation. Therefore, at the time of this reverse rotation, the reed 8 is set in the stopped state.

The amount of reverse rotation of the drive motor 35 is detected as a pulse signal by the encoder 40, passes through the AND gate 53, and then the counter 55.
Entered in. When a "60" pulse is given from the encoder 40 to the counter 55, that is, when the driving motor 35 reverses by a reverse rotation amount corresponding to 6 picks, the latch 45
Since the stored content of the counter and the count value of the counter 55 match, the comparison circuit 46 generates a match signal, which causes the flip-flop.
Set 64 to the set state. As described above, the amount of reverse rotation of the six picks is determined by the minimum number of picks required until the steady rotation speed N is reached after the driving motor 35 is started in the normal rotation direction. Then, the "H" level signal of the flip-flop 64 activates the reverse rotation completion relay 68 to set the contact 68a thereof to the off state. Thus, when the loom is started,
The required amount of reversal of the drive motor 35 is performed.

Simultaneously with the completion of reverse rotation, the reverse rotation completion relay 68 sets its contact 68b to the ON state, so that the forward rotation relay 73 is immediately activated and sets its forward rotation contacts 73a and 73b to the ON state. Therefore, the gate processing circuit 82 of the inverter 37 is switched in the normal direction. At this time, the clutch 34 is activated to connect the reed 8 and the drive motor 35.

Therefore, the soft start circuit 78 gradually increases the voltage of the speed signal S as the output of the speed setting unit 38 for a certain ramp time, and sends it to the V / F converter 79. Here, the V / F converter 79 is
For soft start, a triangular wave with a frequency proportional to the speed command voltage is generated, and this is a three-phase pseudo sine wave generation circuit.
Send to 80. On the other hand, the V / V adjuster 87 receives the voltage command, that is, the frequency command, outputs a duty pulse proportional to the voltage command, and sends this to the three-phase pseudo sine wave generation circuit 80.

Therefore, the three-phase pseudo sine wave generation circuit 80 corrects the waveform of the triangular wave after V / F conversion so that the output waveforms of the sine wave compression circuit and the cosine wave compression circuit are closest to a sine wave, After being multiplied by the voltage command signal, a two-phase to three-phase conversion circuit generates a three-phase sine wave output and sends it to the next circuit.

In this way, the conduction ratio controller 81 determines the conduction ratio by correlating the sine wave with the clock pulse from the triangular wave oscillation circuit 84 and generates drive pulses for the six transistors. This drive pulse is applied to the gate processing circuit
It is processed in the normal rotation direction at 82 and sent to the inverter switching circuit 77 via the driver 83. In this way, the driving motor 35 gradually increases the rotation speed in the starting process in the forward rotation direction, and approaches the steady rotation speed N.

In such a process, when the current of the main circuit exceeds 125% of the rated value, the current detector 85 current-limits the current so that the main current circuit falls within 125% of the rated value by proportionally integrating the amount. , Which limits the flow rate.

Now, when the drive motor 35 rotates in the forward rotation direction by a rotation amount equal to the reverse rotation amount of 6 picks, at this point the drive motor 35
The rotational speed of has reached the steady rotational speed. Therefore, this time, the comparison circuit 47 detects the coincidence state between the rotation amount in the normal rotation direction and the stored content of the latch 45 and sets the flip-flop 65, so that the activation relay 17 receives the coincidence signal B as its output, The delivery motor 14 and the take-up motor 21 are activated by closing the two contacts 17a, 17b.

In this way, after the drive motor 35 rotates in the forward direction by the number of picks equal to the reverse rotation amount, the weft insertion motion, the feeding motion, the beating motion and the opening motion while continuing the beating motion and the opening motion.
The winding motion is started for the first time. Since the phase of the opening device 5 which has been returned is returned to the state before the reverse rotation by the rotation in the forward rotation direction which is equal to the reverse rotation amount, there is no deviation in the fabric structure at the time of starting the weft insertion. At this time, as described above, the rotation speed of the drive motor 35 has already reached the steady rotation speed N, and the rotation is stable. Of course, this initial rotation in the forward rotation direction is a soft start, but during this period, since there is no weft insertion, the bait 8 is in a blank hit state.

FIG. 2 shows such a series of operations on the time axis t by giving two examples, but during the stop period, the steady rotation speed N of the driving motor 35 is operated by operating the speed setter 38. Is changed, the number of picks reaching the steady-state rotation speed N at the time of forward rotation of the drive motor 35 also changes, and accordingly, the reverse rotation amount naturally changes accordingly. Since the reverse rotation time and the normal rotation time are the same in principle, the areas indicated by the diagonal lines are equal to each other.

The acceleration time at the time of starting the drive motor 35 is longer than the deceleration time at the time of stop. The reason why the acceleration time is long is that the current limiting function of the inverter 37 limits the current to a certain value at the time of startup. Therefore, the acceleration torque of the drive motor 35 at the time of start-up is suppressed to a constant value by the current limitation.

The loom is stopped in a short time by the action of the brake 36. Of course, the brake 36 operates even when stopped in the reverse rotation direction, and sets the deceleration time of the loom as short as possible.

〔The invention's effect〕

In the present invention, in the initial stage of start-up, the drive motor is rotated in the reverse rotation direction in advance by the amount necessary to reach the target steady-state rotation speed,
After returning the shedding device, it rotates in the normal direction in the idle state of the reeds, and after a predetermined amount of rotation, the main movements such as weft insertion movement, feeding movement and winding movement of the loom are started. The main motion of the machine and the shedding device coincide with the fabric structure, and the necessary striking force can be obtained from the start of the main motion, and weaving conditions similar to those in the steady state can be set. it can.

In particular, even if the steady-state rotation speed of the drive motor is changed as a new weaving condition, the required amount of reverse rotation from the steady-state rotation speed, the rotation amount at the time of starting in the forward rotation direction, and the transient rise time (normal Since the time from the start of the rolling direction to the reaching of the steady speed is automatically obtained, it is not necessary to adjust the amount of reverse rotation etc. each time the steady speed (speed) is set. It will be possible.

The technique disclosed in JP-A-59-21751 has the following drawbacks. Since there is no reverse operation and the shedding device operates from the start, and after that, the insertion of the weaving machine is started, the rotational phase of the loom and the phase of the fabric structure are deviated. In order to prevent this phase shift, the driving period of only the beating device is limited to one repetitive rotation speed of the fabric structure or a multiple thereof. On the other hand, in the present invention, the opening device is returned by the reverse rotation amount,
When the same amount of rotation in the normal direction is started, a weft insertion motion or the like is started, so that no phase shift occurs.

Further, in the technique disclosed in Japanese Patent Laid-Open No. 59-21751, if the opening device is operated at the same time when the weft insertion is started, the problem of the phase shift disappears, but the load of the driving motor increases rapidly at the time of driving the opening device. Therefore, it becomes impossible to effectively prevent the occurrence of the stop stage. On the other hand, in the present invention, since the opening device is driven by the driving motor during the starting process in the forward rotation direction, there is no sudden change in the load and the occurrence of the stop stage at the start of picking.

[Brief description of drawings]

FIG. 1 is a block diagram of an operating device, FIG. 2 is a time chart during operation, FIG. 3 is a block diagram of a controller, and FIG.
The figure is a sequence circuit diagram, and FIG. 5 is a block diagram of an inverter. 1 ... Driving device, 5 ... Opening device, 8 ... Osa, 14 ...
Sending motor, 17 …… Starting relay, 21 …… Take-up motor, 26 …… Cloth winding motor, 35 …… Driving motor, 37…
… Inverter, 38 …… Speed setter, 39 …… Calculator, 57…
… Run relay, 58 …… Reverse relay, 70 …… Sequence circuit, 73 …… Forward relay.

Claims (3)

[Claims] 1. When the loom is started, by rotating the drive motor in the reverse direction by the reverse rotation amount obtained from the target steady-state rotation speed, the opening device is returned by the reverse rotation amount, and then the forward rotation direction of the drive motor is changed. During the starting process, the opening device is rotated in the forward direction while the comb is idled, and when the drive motor reaches the target steady-state rotation speed by rotating in the forward direction by the same amount as the reverse rotation amount, it is fed out. A method of operating a loom, characterized by starting movement, winding movement and weft insertion movement. 2. A method of operating a loom according to claim 1, wherein when the loom is rotated in the reverse direction and is started in the forward direction, the loom is rotated according to a rising characteristic according to a predetermined soft start speed pattern. . 3. The method for operating a loom according to claim 1, wherein the beating motion is stopped when the drive motor rotates in the reverse direction.