JPS62299548A - Method and apparatus for setting engaging pin timing of apparatus for measuring length of weft yarn and storing saidyarn - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention Technique of the Invention The present invention relates to a drum-type weft yarn length measuring and storage device, and particularly to a method and device for appropriately setting the weft locking timing.

BACKGROUND OF THE INVENTION A drum-type weft length measuring and storage device winds a weft around the outer periphery of a length measuring and storing drum, and stops the unwinding of the weft by means of a locking pin provided on the circumference of the drum so as to be able to move forward and backward. The weft yarn in the stored state is unwound by the backward movement of the locking pin. In this way, the length of the weft yarn for one pick is measured, and the weft yarn is inserted into the warp yarn opening by the weft insertion nozzle at the weft insertion timing.

By the way, the locking pin is driven in synchronization with the rotation of the m machine. Therefore, the locking timing is usually constant. Therefore, depending on the physical properties of the weft due to the size of the yarn feeder, the weight of the weft, the state of twist of the weft, etc., the timing at which the wefted weft reaches the side opposite to the yarn feeder (flying speed) per turn may vary. If the weft yarn changes beyond the time required for unwinding, it becomes impossible to measure the correct length of the weft yarn. For example, when the flight speed becomes slow, the weft yarn is stopped on the drum before it is completely unwound, so the length of the weft yarn becomes shorter than the predetermined length, and conversely, when the flight speed increases, the weft yarn Since more turns than the required number of turns are unwound, the length of the weft yarn becomes longer than necessary. If there is an excess or deficiency in the weft yarn as described above, the loom may stop, weaving flaws may occur in the woven fabric, and the weft yarn may be wasted.

Prior Art On the other hand, various techniques have already been proposed for automatically determining locking timing during weaving.

For example, the invention disclosed in Japanese Patent Application Laid-Open No. 57-29640 detects the unwinding state of the weft yarn on the drum by an unwinding sensor, and when a predetermined number of weft yarns are unwound, a locking pin is plunged onto the drum. There is.

Furthermore, the invention of JP-A No. 60-65150 measures the arrival timing of the weft yarn on the opposite yarn feeding side, and measures the arrival timing of the weft yarn from the time of unwinding, which is one turn less than the number of turns required for weft insertion, to the arrival timing during measurement. The locking laming of the locking pin is set.

Furthermore, the invention of JP-A-60-151343 discloses that at least one part of the length measurement storage drum is
A sensor for detecting the weft end is provided at a position on the weft insertion side by a distance corresponding to the length of the winding, and the locking pin is controlled by a detection signal from this sensor.

In all of the above conventional technologies, when weaving starts, the locking timing of the locking pins is automatically determined. This eliminates the need to set specific timings. but,
In the above-mentioned prior art, the locking pin is caused to perform a locking operation in response to a signal from a sensor, such as a yarn unwinding signal or an arrival signal. In other words, in the above-mentioned conventional technology, the locking timing is predictively determined by calculation, taking into account the rotational speed of the loom, the operation delay of the locking pin drive solenoid, etc., based on the generation timing of the output signal of the sensor. There is. Since this calculation process always includes an element of temporal prediction, appropriate timing settings can only be obtained when the system operates exactly as predicted.

OBJECTS OF THE INVENTION Accordingly, an object of the present invention is to enable the locking timing of a locking pin to be appropriately set by actual measurement without including the element of prediction.

Solution to the Invention Therefore, the present invention experimentally executes the weft length measurement storage operation and the weft insertion movement at a stage before starting regular weaving, and in this process, changes the locking timing little by little over time. By doing so, the optimum weft length is compared with the locking timing when the length is one turn more or less on the drum than that, and the appropriate locking timing of the locking pin is determined from the result of this comparison. I'm trying to set it up.

With such a setting means, the locking pin actually operates and the continuous locking timing is set by actual measurement from the continuous locking timing, so there is no element of prediction as in the conventional technology, and the actual measurement value is Since accurate locking timing is set based on the weaving operation, weft insertion in subsequent weaving operations is stabilized.

Outline of Weft Length Measuring and Storage Device FIG. 1 shows an overview of a drum-type weft length measuring and storage device 1, which is the premise of the present invention.

The weft thread 2 is wound around a thread feeder 3, and the hollow winding is guided into the inside of an arm 5 via a balloon guide 4. In this winding, the arm 5 rotates around the center line of the length measurement storage drum 6 in a stationary state, and sequentially wraps the weft thread 2 around the outer periphery of the drum 6. Unwinding and stopping the unwinding is performed by moving the locking pin 7 back and forth. That is, this locking pin 7 is driven by, for example, an electromagnetic actuator 8, unwinds the weft yarn 2 at the unwinding timing, and plunges into a groove or hole on the circumferential surface of the drum 6 at the subsequent locking timing,
The weft thread 2 is locked at that position.

The tip of the weft yarn 2 passes through a yarn guide 9 and is guided to a weft insertion nozzle IO. During the unwinding of the weft yarn 2, the weft insertion nozzle 10 takes in high-pressure fluid for weft insertion, and causes the unraveled weft yarn 2 to fly together with the jet fluid into the opening 12 of the warp yarn 1), and the weft yarn 2 is unwound. Perform horizontal insertion.

The arrival of the weft yarn 2 on the opposite yarn feeding side is detected by the first weft yarn detector 13a and the second weft yarn detector 13b as weft yarn detection means. Note that one weft thread detector 13a is located at a position corresponding to the most appropriate weft insertion length, and the other weft thread detector 13b is located at a position corresponding to the most appropriate weft insertion length, for example, at a position that is one turn longer on the drum 6 than the most appropriate weft thread length. It is installed in the position it occupies.

Next, FIG. 2 shows the timing relationship of the locking pin 7.

In the graph of FIG. 2, the horizontal axis shows time T, and the vertical axis shows the arrival position E on the opposite yarn feeding side from the horizontal insertion start position S. The unwinding start time, that is, the weft insertion start timing Ts, is fixedly determined, and the arrival timing Te2 at which the tip of the weft thread 2 reaches the arrival position E on the opposite yarn feeding side is given afterwards, and during this time, the weft thread 2 is kept at a constant level. Assuming that it flies at high speed, its path is represented as a straight line graph like a solid line.

Here, assuming that the length of the weft thread 2 for one big is equivalent to, for example, four turns on the drum 6, the locking timing Tc of the locking pin 7 is after the unwinding of the third turn and after the fifth turn. before the start of unwinding, that is, before the start of the first roll for the next wefting. After all, the temporal range of the locking timing Tc of the locking pin 7 is the timing 'l'el
= [Ts+3 (Tez-Ts)/4] to the arrival timing Te2. FIG. 2 shows this period with diagonal lines. Normally, the most stable operating state can be achieved by setting the locking timing Tc of the locking pin 7 to a position approximately in the middle of the period in the above range.

The third embodiment shows the configuration of the locking timing setting device 14 of the present invention. This locking timing setting device 14 includes, in addition to the weft thread detectors 13a and 13b, a locking timing To changing unit 15, an optimum locking timing T.
c arithmetic unit 16, drive control unit 1 of the actuator 8;
It has 7. The external locking timing setter 18 and unwinding timing setter 19 are connected to the changing section 15 and the drive control section 17, respectively.

Further, the weft thread detectors 13a, 13b and the coefficient setter 20 are connected to the input side of the calculation section 16. Further, the drive control section 17 includes a changing section 15 and a calculating section 1 on the input side.
6 and a rotation angle detector 21 of the loom, and, as already mentioned, is connected to a driving actuator 8 for driving the locking pin 7 on the output side. In addition,
The drive control section 17 stores various programs as described below, and executes necessary control based on the programs in cooperation with internal registers.

FIG. 4 shows the sequence of operations of the control system. In the main program shown in FIG. 1 (1), after its start, the end flag, the register value P1, the most continuous locking timing Tc, etc. are initialized by initialization.

In addition, in the interrupt program for setting the locking timing TO shown in (2) of the same figure, for each revolution of the main shaft of the loom,
This interrupt program is executed every reference timing issued from the rotation angle detector 21 at a predetermined rotation angle.

A certain locking timing T0 is determined by the locking timing setter 18.
It is tentatively determined in advance by , and an appropriate time Δ
It is set smaller for each T. Here, Pm is a value that determines a predetermined pick, and if it is set in advance as Pm=O, for example, the temporarily determined locking timing T0 is changed by a time ΔT for each pick. The above is the interrupt routine for changing the locking timing TO.

Next, as shown in FIG. 3(3), the interrupt program for setting the optimum locking timing Tc by the first and second weft thread detectors 13a and 13b is executed by the second weft thread detector 13b.
is started when a change from the state with thread to the state without thread is detected as shown in FIG. 5(a). When the level of the detection signal from the second weft detector 13b changes, the calculation unit 16 stores the locking timing T0 being changed at that time as the upper limit locking timing Tmax. Next, when the first weft thread detector 13a detects a threadless state as shown in FIG. The locking timing T0 is the lower limit locking timing Tm
i.sub.in, and the optimum locking timing TC is calculated from these timings. This calculation formula is expressed by the following general formula.

Tc=Tmin+K (Tmax-Tmin) Here, the coefficient is set by the coefficient setter 20, and is usually set to 1/2 for simple average value calculation. When such calculations are completed, an end flag is set and the process moves to the next step.

Such timing calculations are performed in the trial weaving stage before starting the regular weaving operation, and are stored in the drive control section 17.

Therefore, during the subsequent regular weaving operation, the drive control unit 17 drives the actuator 8 at the determined optimum locking timing TC.

Other Embodiments In this embodiment, instead of the first weft thread detector 13a and the second weft thread detector 13b arranged on the reaching side of the weft thread 2, the weft thread is unwound from the drum 6 at the time of weft insertion as a weft thread detection means. an unwinding sensor 22 that detects the weft yarn 2 near the drum 6, and a first counter 23 and a second counter 24 that count the unwinding signal from the unwinding sensor 22.
It consists of.

For example, assuming that four rolls on the drum 6 correspond to one pick length, and the first counter 23 counts four unwinding signals, it outputs an "H" level signal, and the second counter 24 outputs an "H" level signal. It is assumed that when five unwinding signals are counted, an "H" level signal is output.

Then, as in the above embodiment, when the locking timing To is changed so that the length of the weft thread 2 becomes short from long, the weft insertion state is changed from a weft insertion state that is one turn longer than one pick length to a weft insertion state that is one pick length longer. In the process of changing the state, the second counter 24
The signal changes from the “H” level to the “L” level, and furthermore, from the horizontal insertion state of 1 pick length to the 1 pick length
In the process of changing to the short winding weft insertion state, the signal of the first counter 23 changes from the "H" level to the "L" level. Therefore, the calculation unit 16 stores the locking timing To at the time when the output signals of the first and second counters 23 and 24 change as the lower limit and upper limit locking timings, respectively. The subsequent operation is similar to that of the previous embodiment.

As understood from this example, the weft thread detection means is
It may be arranged either on the arrival side of the weft thread 2 or on the unwinding side.

Modifications of the Invention Although each of the above embodiments is shown using functional blocks as an example, the functions of these parts can be realized using the functions of a microcomputer. Further, the length of the weft thread 2 may be changed from short to long.

Effects of the Invention In the present invention, in the process of actually changing the locking timing of the locking pin and changing the length of the weft thread, the most appropriate and optimal locking timing is determined by actual measurement, and also based on the flying condition of the weft thread. Since it is determined by taking into account the influence, there is no need to predict the locking timing in the process of setting the locking timing, as in the prior art, and the weaving becomes more stable.

[Brief explanation of the drawing]

Fig. 1 is a schematic side view of the weft thread length measuring and storage device, Fig. 2 is a graph showing the arrival timing of the weft thread and the position of the weft thread tip, Fig. 3 is a block diagram of the locking timing setting device,
Figure 4 is a flowchart diagram of (1), (2), and (3).
The figure is a plan view of the positional relationship between the weft thread tip and the first and second weft thread detectors, and FIG. 6 is a block diagram of another embodiment of the locking timing setting device. 1. Weft length measurement storage device, 2. Weft, 5. Arm for winding, 6. Drum, 7. Locking bottle, 8. Actuator, 10. Nozzle, 13a, 13b... Weft thread detector, 14...Lock timing setting device, 15.
- Changing unit, 16... Calculating unit, 17... Drive control unit, 1
8: Locking timing setter, 19: Unwinding timing setter, 20: Coefficient setter, 21: Rotation angle detector, 22: Unwinding sensor, 23: First counter, 2
4...Second counter. Figure 3 Figure 4 r7
r2-Figure 4 t3-Figure 5 13a 13b Figure 6 1eJ 79

Claims (2)

[Claims] (1) Wrap a weft thread around the outer circumference of the drum for length measurement storage,
In the weft yarn length measuring and storage device of the type in which unwinding of the weft yarn at the start of weft insertion and unwinding of the weft yarn at the end of weft insertion are performed by advancing and retreating movement of a locking pin that plunges into the circumferential surface of the drum, the locking pin When setting the optimal locking timing of the locking pin, the locking timing of the locking pin is temporarily changed little by little, and in this process, the number of turns of the inserted weft yarn that corresponds to the appropriate length of one pick is determined. 1 from the locking timing when changing to 1 pick and the appropriate length of 1 pick.
The process of memorizing the locking timing when the number of turns changes to a longer or shorter winding length, and calculating the time difference between the above two locking timings, and finally determining the optimal locking timing from this time difference. A locking pin timing setting method comprising the steps of: (2) Wrap a weft thread around the outer circumference of the drum for length measurement storage,
In the weft yarn length measuring and storage device of the type in which unwinding of the weft yarn at the start of weft insertion and unwinding of the weft yarn at the end of weft insertion are performed by advancing and retreating movement of a locking pin that plunges into the circumferential surface of the drum, the locking pin A changing part that temporarily changes the locking timing little by little, and a change part that temporarily changes the locking timing of a weft detecting means for detecting a locking timing when the number of turns changes to a length corresponding to one turn longer or shorter; and a weft yarn detecting means that stores both of the locking timings and calculates a time difference between the locking timings, A calculation section that ultimately sets the optimal locking timing from this time difference, and a fixed unwinding timing, provisional locking timing from the changing section, and optimal locking timing from the calculation section as inputs. A locking pin timing setting device comprising a drive control section that controls the locking pin driving actuator while checking the rotation angle of the loom.