JPH0713341B2 - Horizontal control device - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a drum type weft inserting device for a jet loom, and more particularly to a technique for automatically controlling a locking timing of a weft thread locking pin.

BACKGROUND OF THE INVENTION A drum type weft inserting device of this type draws out a weft yarn from a yarn feeder by a rotary motion of a rotary yarn guide, and sequentially winds the weft yarn around a peripheral surface of a drum for measuring and storing in a stationary state. While storing the weft thread of the length required for weft insertion of one pick while measuring it, the weft thread is locked on the peripheral surface of the drum by the forward / backward movement of the locking pin with respect to the outer peripheral surface of the drum. Unwind the stored weft thread. At the time of this unwinding, the weft insertion nozzle jets a pressure fluid into the warp yarn opening, so that the weft yarn after the length measurement is inserted into the warp yarn opening and intersects with the warp yarn.

By the way, the rotary motion mechanism of the rotary yarn guide and the forward / backward drive mechanism of the locking pin are mechanically connected to the crankshaft of the loom in order to synchronize with the main motion of the loom. However, when the above mechanism is connected to the crankshaft,
When the loom speeds up, there is a limit to the mechanical follow-up speed of the locking pin, and in the case of multicolor weft insertion, it becomes difficult to freely select the weft insertion.

Such inconvenience is caused by driving the rotary yarn guide with a dedicated motor and driving the locking pin with a plunger such as a solenoid without taking the drive source of the rotary yarn guide and the locking pin from the crankshaft of the loom. Can be resolved.

However, in the actual weft insertion, the weft insertion speed changes due to changes in the winding tension of the weft thread stored in the drum, so if the timing of the forward / backward movement of the locking pin is fixed, The above-stored weft yarns are unwound more or less than the length required for one pick weft insertion, resulting in an excess or deficiency in length measurement.

Prior Art For example, the invention of Japanese Patent Laid-Open No. 57-29640 has an optical sensor on the drum to detect the actual unwinding amount in order to solve such an excess or deficiency of the length measurement. The yarn clamp is controlled based on this. Here, if the optical sensor operates accurately, the above invention is very effective. However, when the weft thread passes through the sensor for a short time, and when cotton dust or the like passes through the front surface of the sensor or strong light is incident from the outside, the sensor detects those conditions. , It tends to malfunction. As a result, the weft insertion at that time becomes an incomplete or unstable state, which causes a weft insertion failure and causes the loom to stop.

Therefore, the patent applicant further improved the above-mentioned invention to automatically correct the locking timing of the locking pin in an appropriate direction according to the actual weft insertion state, and In order to determine the possibility of malfunction in the detection process and prevent erroneous correction at that time, Japanese Patent Application No. 60-07115
We have already proposed No. 7 "Horizontal insertion control method and device".

That invention is, at the time of unwinding the weft thread, detecting the number of turns of the weft thread unwound on the drum for measuring and storing, for example, by an optical sensor, and when unwinding the number of windings to be taken, and a preset standard. The locking timing is compared with the locking timing of No. 1, and the time difference between these timings is obtained, and the above-mentioned standard locking timing is corrected by this time difference.

Further, in such a correction process, when a signal having a pulse number that is larger than or smaller than the number of turns required to insert one pick is input as false information from the optical sensor, the above correction is not performed, and It is set as it is.
As a result, erroneous correction can be reliably prevented. In this way, the control device sets the locking timing of the locking pin to an appropriate timing every one rotation of the loom, that is, every one cycle or every several cycles.

The probability of malfunction of the optical sensor is basically the same as that of the conventional optical sensor. However, when the number of pulses of the detection signal becomes excessive or insufficient, the control device does not perform a series of correction operations, so that the frequency of malfunctions can be suppressed to the minimum.

However, in the invention of the above-mentioned Japanese Patent Application No. 60-071157, the correction of the locking timing affects the movement of the locking pin for the first time at the time of inserting the next and subsequent strokes. The locking action of the stop pin cannot follow it. As a result, at that time, a long pick or a show topic occurs, which results in poor picking and is easily stopped.

Here, there are various causes for causing a drastic change in the weft-inserted state, and the following cases can be listed as predictable ones.

(1) When the loom is stopped for a long time, the air from the supply source leaks into the tank from the air pressure adjustment valve, which increases the pressure in the tank and causes the weft thread to be more liable than during start-up and continuous operation. When flying at high pressure.

(2) In multicolor weft insertion, the weft insertion device for a certain weft thread is stopped for a long time depending on the pattern, and the pressure in the piping system and tank of the weft insertion nozzle rises, so that weft thread is selected and weft insertion When flying at a higher pressure than during continuous operation.

(3) When changing the weave pattern, such as changing the warp shedding pattern, the load on the loom changes and the number of revolutions also fluctuates, causing the weft thread flying condition to change.

These phenomena occur during the transitional operation period of the loom and are predictable, so that they can be control targets at the same time.

Therefore, an object of the present invention is to prevent a weft insertion defect due to a shift in the locking timing of the locking pin during a sudden change in the predictable weft insertion state during a transient operation period of the loom,
It is to operate the loom stably.

Therefore, in the present invention, the above-mentioned prior art is incorporated into a first control system, and a second control system is added to the first control system so as to cope with a predictable change by the second control system. I have to. That is, the second control system controls the locking timing at the time of a sudden change of the foreseeable weft insertion state, that is, from the time of occurrence of the abrupt change of the foreseeable wed insertion state to the transition to the stable state. For this reason, the unwinding signal from the unwinding sensor is counted, the value is compared with a preset reference unwinding amount, and locking is performed when they match. In this way, during the transitional operation period, the locking timing is controlled by the second control system, and when the loom moves to stable operation, the locking timing is controlled by the first control system. There is.

In this way, the locking timing of the locking pin is always corrected in an appropriate direction according to the actual weft insertion state.

Configuration of Embodiment FIG. 1 shows a configuration of a weft insertion control device 1 of the present invention and a configuration of a weft insertion device 100 as a control target thereof.

The weft insertion device 100 includes a rotary yarn guide 2, a length measurement storage drum 3, and a locking pin 4 as mechanical components.
And a weft insertion nozzle 5.

The rotary yarn guide 2 is driven by a drive motor 8 and pulls out the weft yarn 7 from the yarn supplying body 6, while the rotary motion thereof sequentially winds the weft yarn around the outer peripheral surface of the drum 3 in a stationary state. Therefore, the locking pin 4 is driven by a solenoid 9 to measure the length of the weft yarn 7 on the circumferential surface of the drum 3 and when the weft yarn 7 is stored, the wetting yarn 4 is thrust into the circumferential surface of the drum 3 to bring the weft yarn 7 into a locked state. . When the locking pin 4 retracts, the weft yarn 7 in the stored state is unwound from the outer peripheral surface of the drum 3 and is wefted into the warp yarn opening by the weft insertion nozzle 5.

And, the weft insertion control device 1 of the present invention is the second control system.
It is divided into 1a and the second control system 1b, and has the following as electrical control elements.

First, the first comparator 10 of the first control system is connected at one input end to the encoder 11 for detecting the rotation angle of the loom, and at the other input end, adjustable timing setting. It is connected to the switch 12 and the switch 1 on the output side.
4. It is connected to the solenoid 9 to be controlled via the driver 13.

On the other hand, the weft insertion control device 1 includes, as a detection end of the feedback correction system, near the drum 3 and closer to the weft insertion nozzle 5 than the locking pin 4, for example, an optical unwinding sensor 16. There is. The unwinding sensor 16 has a pair of light emitting and receiving elements built-in, an unwinding number counter 17, a second comparator 18,
It is connected to the adjustment input terminal of the timing setter 12 via the memory circuit 19, the read judgment circuit 20 and the correction circuit 21, and is branched to also have the unwinding number suitability judgment counter 22.
It is also connected to the reset side input terminal of the memory circuit 19 via.

Next, the unwinding number counter 23 of the second control system 1b is connected to the unwinding sensor 16 at one counting side input end, and is connected to the output end of the first comparator 10 at the other reset side input end. On the output side, it is connected to the solenoid 9 to be controlled via the switch 14 and the driver 13. In addition, the unwinding number setting device 24
Is connected to the input terminal on the count number comparison side of the unwinding number counter 23, and is further branched to count numbers of the unwinding number counter 17 and the unwinding number suitability determination counter 22 of the first control system 1a. It is connected to the input terminal on the comparison side.

On the other hand, the switching device 14 constitutes switching means together with the switching command device 15, and is connected to the output end of the switching command device 15 on the input side.

Next, referring to the time chart of FIG. 2 (a),
The operation of the weft insertion control device 1 during stable operation will be described. As described above, the rotary yarn guide 2 pulls out the weft yarn 7 from the yarn feeder 6 while rotating it at a predetermined speed, and sequentially winds the weft yarn 7 around the outer peripheral surface of the drum 3 for length measurement storage. At the beginning of this winding, the locking pin 4 projects into the peripheral surface of the drum 3 and locks the weft thread 7 there. In this way, the weft insertion device 100 measures, on the outer peripheral surface of the drum 3, one or more picks 7 required for weft insertion in a wound state, and stores them for the weft insertion.

In the meantime, in the first control system 1a, the encoder 11 detects the rotation angle Θ of the loom and sends a signal corresponding to that angle. On the other hand, the timing setting device 12 outputs a signal corresponding to the unwinding timing of the locking pin 4, that is, the unwinding rotation angle Θ1 and the locking timing of the locking pin 4, that is, the locking rotation angle Θ2, to the first comparator 10. Is given to. Therefore, the first comparator
10 compares them, in the period of the engagement rotation angle Θ2 from the unwinding rotation angle .theta.1, "H" level to generate driving signals S _1, the driving signals S ₁ by the driver 13 "H" level The solenoid 9 is driven and the locking pin 4 is retracted over the section. At this time, the weft yarn 7 in the stored state is unwound on the outer peripheral surface of the drum 3, and is wefted into the opening together with the weft loading fluid by the weft loading nozzle 5.

During this weft insertion, the optical unwinding sensor 16 generates a pulsed detection signal S ₂ corresponding to the unwinding number of the weft thread 7. If 1 turns of the weft yarn 7 required for weft insertion pick, for example, "3", the detection signal S ₂ will include three pulses to the normal being unwound.

On the other hand, solutions舒数counter 17 in such a solution舒前, solutions舒数suitability judging counter 22, Oobi storage circuit 19 in advance, is set to the state of "0" by the reset signal S _3. Therefore, the unwinding counter 17 counts the three pulses of the detection signal S ₂ during the weft insertion operation, and at the final unwinding time, that is, when the third pulse is received, the comparison command signal S ₄ Is generated and sent to the second comparator 18. This second comparator 18 is
The locking rotation angle Θ2 is compared with the generation time point of the comparison command signal S ₄ , a correction angle signal ΔΘ corresponding to the time point difference is generated, and it is stored in the memory circuit 19.

Since the read signal S ₅ is input to the read determination circuit 20 at the time when the horizontal insertion is completed, the read determination circuit 20
The correction angle signal ΔΘ is read from the storage circuit 19 and sent to the correction circuit 21. The correction circuit 21 averages the correction angles of the correction angle signals ΔΘ for each predetermined cycle of the loom, and based on this, the locking rotation angle Θ of the timing setting device 12.
In order to correct 2 in the direction of eliminating the time difference, a correction signal S ₆ of a digital amount or an analog amount is generated, and the locking rotation angle Θ 2 is corrected in the direction of advancing or retarding. Therefore, the reference locking timing at the initial stage of starting the loom is sequentially corrected as the weaving progresses, and the corrected locking timing is updated according to the subsequent weaving situation. It should be noted that the unwinding rotation angle Θ1 operates at a predetermined unwinding timing in order to carry out lateral insertion at the optimum opening position and is not corrected. Fig. 2 (a)
Indicates cycle A when the locking rotation angle Θ2 is advanced,
On the contrary, the cycle B indicates the case of delaying.

The above operation is a normal state, but when the sensor 16 detects a pulse of "2" or less, or a pulse of "4" or more, the following operation is performed.

First, when, for example, only two pulses are output from the unwinding sensor 16 in one cycle, the unwinding number counter 17 does not output the comparison command signal S ₄ . Therefore, the second comparator 18 does not perform the comparison operation in the one cycle and does not output the correction angle signal ΔΘ to the memory circuit 19. At this time, the correction operation as described above is not performed. After that, the unwinding number counter 17, the unwinding number appropriateness determination counter 22, and the memory circuit 19 are returned to the initial state by the reset signal S ₃ to prepare for the auxiliary operation in the next cycle.

Next, when the unwinding sensor 16 generates, for example, four pulses, the unwinding number counter 17 will generate the comparison command signal S ₄ to the second comparator 18 at the wrong timing. At this time, the storage circuit 19 has a result of storing the incorrect information. However, since the unwinding number suitability determination counter 22 is set to “4” as the count value, when four pulses are input from the unwinding sensor 16 by the detection signal S ₂ , the unwinding number suitability determination is performed. The counter 22 generates a supplementary reset signal S ₇ in the memory circuit 19, thereby erasing the stored contents of the memory circuit 19. For this reason, the read determination circuit 20 cannot read the signal from the storage circuit 19, so that malfunction can be reliably prevented. Of course, the same operation is performed even when the number of pulses more than this is input. When a pulse of "8" or more is input to the unwinding number suitability determination counter 22 during one cycle, the memory circuit 19 causes 2
It will be reset more than once, but there is no problem in operation. This situation is illustrated by cycle C in Figure 2 (a).

On the other hand, if there is a sudden change in the weft insertion state,
Signals such as a selection signal at the initial stage of operation, a multicolored weft insertion, and a change of the opening pattern structure, which cause them, are sent from the switching command device 15 to the switching device 14 in advance. Therefore, the switch 14 switches so as to send the control signal from the second control system 1b to the solenoid 9, instead of the control signal from the first control system 1a up to now. As a result, the solenoid 9 is placed under the control of the unwinding number counter 23.

The control is shown in FIG. 2 (b). First, the reset signal S ₃ ′ corresponding to the unwinding rotation angle θ ₁ sent from the first comparator 10
In solution舒数counter 23 is reset, simultaneously solutions舒数counter 23 from the "H" level driving signal S ₁ 'is generated. The drive signal S ₁ ′ causes the driver 13 to drive the solenoid and retract the locking pin 4 over the “H” level section. At this time, the weft yarn 7 in the stored state is unwound on the outer peripheral surface of the drum 3, and is wefted into the warp yarn opening together with the weft loading fluid by the weft loading nozzle 5.

During this weft insertion, the unwinding sensor 16 produces a pulsed detection signal S ₂ ′ corresponding to the unwinding number of the weft thread 7. At this time, the unwinding number counter 23 counts this detection signal S ₂ ′, compares the count number with a set value preset by the unwinding number setting device 24, and when they match, the drive signal S ₁ ′ Is set to “L” level, the locking pin 4 is advanced, and the weft thread 7 is locked. Here, if the number of weft threads required for weft insertion for one pick is, for example, "3", the set value of the unwinding number setting device 24 is set to "3".

On the other hand, as a method of giving a switching command to the switching device 14, there are the following methods for each cause.

(1) When a driving signal is input, a color selection signal, or a tissue change signal is input, the first control system 1a is switched to the second control system 1b until the weft insertion is stabilized. After a certain period of time has elapsed, the control system is switched to the first control system 1a again. Alternatively, after switching to the second control system 1b, the number of picks is counted, and when it reaches a constant value, it is switched to the first control system 1a.

(2) Detecting the weft insertion air pressure and outputting a signal for switching to the second control system 1b when it is outside the stable operation range.

(3) The loom rotational speed is detected, and when it is outside the stable operation range, a signal for switching to the second control system 1b is output.

In this embodiment, the detection signal S ₂ ′ from the unwinding sensor 16 is output to the unwinding number counter 17 of the first control system 1a even while switching to the second control system 1b. However, if the second control system is switched to for a while even after returning to the stable state from the sudden change in the weft insertion state, the locking timing of the first control system 1a during that time is the normal reference locking. The timing is corrected.

Modification of the Invention In the above embodiment, the correction circuit 21 performs averaging in order to avoid a sudden change in the control state.
It may be omitted at the time of correction for each cycle. Since the unwinding number counters 17 and 23 are not used at the same time, one of them can be omitted if the other one is also used.

When the loom is rotating at a high speed and there is an operation delay in the operation unit such as the solenoid 9, the locking timing is set earlier than the appropriate timing on the time axis by taking into account the delay time in advance. To be done.

EFFECTS OF THE INVENTION In the present invention, the following unique effects are obtained.

First of all, in the first control system, the locking timing of the locking pin is automatically corrected according to the actual weft insertion speed, so that stable length measurement storage operation and weft insertion can be performed, The excess and deficiency of can be reliably prevented.

Second, when a foreseeable sudden change in the weft insertion state occurs, the set unwinding amount and the actual unwinding amount are set until the stable operation is switched from the first control system to the second control system. Since the unlocking amount is compared and the locking pin is controlled, a stable insertion pin control can be realized without causing misalignment even during excessive operation.

[Brief description of drawings]

FIG. 1 is a block diagram of a weft insertion control device of the present invention, FIG. 2 (a) is a time chart diagram during operation by the first control system, and FIG. 2 (b) is operation by the second control system. It is a time chart figure of time. 1 ... Weft insertion control device, 2 ... Rotating yarn guide, 3
…… Length measurement storage drum, 4 …… Locking pin, 5 …… Weft insertion nozzle, 6 …… Thread feeder, 7 …… Weft thread, 8 …… Drive motor, 9 …… Solenoid, 10 …… 1 comparator, 11 ……
Encoder, 12 ... Timing setting device, 13 ... Driver, 14 ... Switching device, 15 ... Switching command device, 16 ... Unlocking sensor, 17 ... Unlocking counter, 18 ... Second comparator, 19 ...
… Memory circuit, 20 …… Reading judgment circuit, 21 …… Correction circuit, 22 …… Counter for judging unsuitability of unwinding number, 23 …… Unwinding number counter, 24 …… Unwinding number setting device, 100 …… Horizontal apparatus.

Claims (3)

[Claims] Claim: What is claimed is: 1. An outer peripheral surface of a measuring storage drum in a stationary state,
The weft thread is wound by the rotating yarn guide to store it while measuring the length, and the unwinding and locking of the weft thread is controlled by the forward / backward movement of the locking pin, and the weft thread is inserted into the warp opening by the weft insertion nozzle. In the weft insertion device (100), an unwinding sensor (16) for detecting the number of turns of the weft thread unwound on the drum when unwinding the weft thread,
The rotation angle of the loom is compared with the set unwinding timing and the standard locking timing, the locking pin is retracted from the outer peripheral surface of the drum at the unwinding timing, and the locking pin is moved at the locking timing. Of the final winding number of the weft yarn detected by the unwinding sensor and the set reference locking timing, and the locking timing is set in the direction to eliminate the time difference. The first control system (1a) to be corrected is compared with the actual number of unwinding windings of the weft and the preset number of unwinding windings is compared, and at the time when they match, the locking pin is thrust into the outer peripheral surface of the drum. ,
A second control system (1b) for retracting the locking pin from the outer peripheral surface of the drum at the unwinding timing, and for controlling the locking pin by the first control system during stable operation of the loom, Locking characterized by including switching means (14, 15) for controlling the locking pin by the second control system during a period from a sudden change of the weft insertion state to the start of stable operation. Pin control device. 2. An adjustable timing setting device (12) for setting an unwinding timing and a reference locking timing of the first control system (1a), and an unwinding timing and a reference of the unwinding timing from the timing setting device. The number of pulses from the first comparator (10) that generates the drive signal for the locking pin and the unwinding sensor is counted by comparing the locking timing with the rotation angle of the loom, and at the time of unwinding the final number of windings. An unwinding number counter (17) for outputting a comparison command signal, comparing a comparison command signal from the unwinding number counter with the reference locking timing, and generating a correction angle signal corresponding to the time difference. 2 comparator (1
8), a storage circuit (19) for storing the correction angle signal from the second comparator, a read determination circuit (20) for reading the contents of the storage circuit and correcting the timing setter so as to eliminate the time difference. The weft-insertion control device according to claim 1, characterized in that 3. An auxiliary unwinding winding number for invalidating the output signal from the second comparator when the first control system (1a) counts more pulses than the winding number required for weft insertion. The weft insertion control device according to claim 2, further comprising a suitability determination counter (22).