JPS61275444A - Method and apparatus for controlling drum type length measuring storage apparatus - Google Patents

Abstract

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

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a drum-type length measurement and storage device, and more particularly to a method and device for controlling the movement of a locking pin thereof.

BACKGROUND OF THE INVENTION A drum-type length measurement and storage device is used as a weft supply section of a high-speed jet loom. FIG. 1 shows a typical drum-type length measurement and storage device 1. As shown in FIG.

The weft yarn 2 is unwound from the yarn feeder 3, and the winding, which is driven by an independent dedicated motor, passes through the inside of the arm 4.
Due to its rotational movement, the drum 5 for length measurement storage in a stationary state
The weft thread 2 is wound in sequence around the outer circumference of the drum 5. The weft thread 2 is locked and unwound by a locking pin 6. The locking pin 6 protrudes into the circumferential surface of the drum 5 and locks the weft thread 2 on the circumferential surface of the drum 5 during length measurement storage operation. Next, the locking pin 6 is driven in the backward direction by the electromagnetic plunger 7 at the weft insertion timing to unwind the weft thread 2. At this time, the main nozzle 8 for weft insertion moves the weft thread 2 in the unwound state. with the injection fluid,
I'll put it on the road. In addition, during this unwinding, the weft thread 2
is guided to the main nozzle 8 via the balloon breaker 9. On the other hand, the unwinding of the weft thread is detected by a sensor installed above the length measuring drum, and when it reaches a preset number of unwinding turns, the electromagnetic plunger 7 is immediately driven, and the locking pin 6 plunges into the weft thread. Then, the weft thread 12 is locked. However, the rotation speed of the loom lO becomes high, or
When the number of windings of the weft thread 2 increases and the unwinding time per winding of the weft thread on the length measuring drum becomes shorter, the drive signal B is applied to the electromagnetic plunger 7 after the number of windings of the weft thread to be unwound reaches the set number of windings. If the electromagnetic plunger 7 had an operation delay time, the locking would be delayed and the length measurement would be several turns long (
It will be done. Therefore, the drive signal B must be generated early enough to allow for the delay time of the electromagnetic plunger 7.

Prior art and its problems In a device that performs a length measurement operation by moving a locking pin forward and backward in synchronization with the main movement of the loom 10, the timing at which such drive signal B is generated is determined by the rotation angle of the loom 10. This can be determined by setting the position earlier by the delay time with reference to . Conventional solutions include, for example, Japanese Patent Application Laid-Open No. 57/τ296.
As described in No. 40, "Yarn supply device and its operating method," in a device that controls the locking pin and measures the length by counting the number of unwound turns of the weft yarn, the delay time of the electromagnetic plunger 7 is counted. Compensation is made by the number of unwound turns of the weft thread. However, because the unwinding resistance of the weft yarn and the size of the balloon during unwinding change periodically due to changes in the winding diameter of the yarn supplying body 3, the unwinding time for one turn of the weft yarn changes, so the unwinding of the counted weft yarn If the entry timing of the locking pin 6 is set based on the number of turns, accurate weft thread locking operation cannot be expected. Furthermore, during high-speed operation, the plunge timing of the locking pin 6 cannot be uniquely set based on the rotation angle of the loom 10.

OBJECTS OF THE INVENTION Accordingly, an object of the present invention is to enable accurate tracking of forward and backward movements of the locking pin 6 to be controlled, especially the entry timing, even when the resistance of the weft thread 2 during unwinding of the weft thread 2 or the balloon changes. It is to be.

Structure of the Invention Therefore, the present invention measures the time required for unwinding a unit number of turns of the weft thread 2, for example, 1 @, during weft insertion, and calculates the unwinding time at a certain unwinding time based on the measured unwinding time. The timing of generating the drive signal to the electromagnetic plunger 7 is calculated by taking into account the delay time of the electromagnetic plunger 7 from the time when the yarn signal is generated. In this way, the unwinding time required to unwind 201 turns of weft yarn is constantly measured, and the timing is set for each weft insertion in relation to this, so the unwinding time required to unwind 1 turn of weft yarn 2 is measured. Even if the time changes periodically, the plunge timing of the locking pin 6 is set at the most appropriate time, for example, in the time range after the last winding is unwound and before the start of length measurement of the next weft thread 2. It will automatically adjust to the middle of the time range.

Configuration of Embodiment 1 Hereinafter, the configuration according to Embodiment 1 of the present invention will be specifically explained based on the drawings.

First, FIG. 2 shows a digital control device 11. As shown in FIG. This control device 11 includes a counter 12 as a digital circuit element and an amplifier down counter 13 as an arithmetic unit.
, a comparator 14, and a flip-flop 15 as a memory circuit, as well as a winding number setter 16, a delay time setter 17, an AND gate 18, 19, 20, and an OR gate 21.
, and a one-shot multi-by-break 22. The counter 12 has a winding number setting device 1.
6, and with thread signal A as input, n-2, n
-1 and n outputs are generated sequentially.

The yarn signal A is detected by the sensor 23. That is, as shown in FIG. 1, this sensor 23 is located on the downstream side of the locking bin 6, detects the passing state of the weft thread 2 during unwinding, and detects "H" every time one turn of the weft thread 2 is unwound. ” generates a level pulse signal, that is, a thread signal A.

The output terminal of the counter 12 is the AND gate 1
8.19.20 and one input terminal of the OR gate 21, respectively. Above and gate 18.19
inputs the reference signals f1 and f2 at the other input terminals, respectively, and sends the output terminals to the up input terminal and the down input terminal of the up/down counter 13, respectively. In addition, this up/down counter 13 and delay time setting device 17
are connected to the comparator 14, respectively.

The output terminal of this comparator 14 is connected to the other input terminal of an AND gate 20, and the output terminal of this AND gate 20 is connected to the other output terminal of an OR gate 21, and furthermore, the output terminal of this OR gate 21 is connected to the other input terminal of an AND gate 20. is connected to the set input terminal of the flip-flop 15. Also,
The unwinding timing signal C is input to the reset input terminal of the flip-flop I5. Further, the unwinding timing signal C is connected to the input terminal of the counter 12. The output of this flip-flop 15 is a drive signal B. Note that this drive signal B is also input to the reset input terminal of the up/down counter 13 via the one-shot multi-by-break 22 .

Operation of Embodiment 1 Next, the operation of the control device 11 will be explained with reference to FIG. 3.

In the following explanation, - As an example, the number of turns of the weft thread 2 on the drum 5 required for weft insertion of one pick is "4", that is, n=4.
It will be explained as follows.

Assuming that the flip-flop 15 is currently being centered, the locking pin 6 enters the circumferential surface of the drum 5 and the weft thread 2 is moved because the "H" level drive signal B is input to the electromagnetic plunger 7. It is locked. Therefore, the winding arm 4 sequentially winds the weft thread 2 around the circumferential surface of the drum 5.

On the other hand, since the unwinding timing signal C at the "H" level is input to the reset input terminal of the flip-flop 15 at the wefting timing of the loom 10, the drive signal B changes from the "H" level to the "L" level. . This unwinding timing signal C is detected by the angle detector 24 at the rotation angle of the loom 10, as in the conventional case, and is generated early in consideration of the delay time of the electromagnetic plunger 7. At this time, the counter 12
is reset, and the up/down counter 13 is reset by the one-shot multi-by-break 22, and its count value P returns to the state of rOJ.

At this time, the locking bin 6 is moved back, and the weft yarn 2 in the length measurement storage state is brought into a state in which it can be wefted, that is, in an unwound state. On the other hand, the main nozzle 8 pulls out the unwound weft yarn 2 at the weft insertion timing and inserts it into the weft.

On the other hand, the sensor 23 detects when unwinding each turn of the weft yarn 2.
A thread signal A of "H" level is generated.

The number of turns n of the weft thread 2 required for one stitch is "4" in this example, so the number of turns n of the weft thread 2 required for one stitch is "4", so the weft insertion period T is
The thread signal °A at the H" level appears.

First, when the (n-2)th thread signal A is input, the output n-2 of the counter 12 goes to "H" level, so the reference signal f1 is sent to the unit number of turns, that is, the number of turns of one turn. Over the period To, the amplifier down counter 13
is input to the up input terminal of Here, the knob down counter 13 receives its reference signal f1 during the unwinding time TO.
Count the number of pulses. Next, when the (n-1)th thread signal A is input, the output of the counter 1.2 is n-1.
goes to the "H" level, so that the reference signal f2 is input to the down input terminal of the up/down counter 13 through the anti-game 18 over the next unwinding time TO.

Here, when the count value P of the amplifier down counter 13 matches the set value Ps of the delay time setter 17, the comparator 14 generates a match signal of the 11 HII level, so the AND gate 20 outputs a "H" level signal. The match signal is sent to the set input terminal of the flip-flop 15 through the OR gate 21.

Therefore, the flip-flop 15 goes high after the (n-1)th generation of the thread signal A and when the standby time 'rp has elapsed.
A level drive signal B is generated to drive the electromagnetic plunger 7.

The electromagnetic plunger 7 starts immediately, but as mentioned above, there is a delay time ΔT, so after the delay time ΔT has elapsed, the locking pin 6 is released at an appropriate plunge timing, for example, when the thread signal is generated for the nth time. , at a timing 1/2 after the measured time TO, enters the circumferential surface of the drum 5 and locks the weft yarn 2 on the circumferential surface of the drum 5. Note that the comparator 14 generates an "H" level signal when the count value P matches the set value Ps even in the process of counting the reference signal f1.
The output n-1 of 2 is sent to one input terminal of AND gate 20, inhibiting the coincidence output at that time.

Here, the principle of the above-mentioned time measurement will be explained.

First, the reference signals f1 and f2 are set to have the following relationship in consideration of the rush timing.

fl=1.5 ・ f 2 ・ ・ ・
・ ・ ・ (1) On the other hand, the relationship between the unwinding time To, To “and To” per unwinding is actually ToζT
o'"=-To" This and locking pin 6
The relationship between the delay time ΔT and the standby time 'rp is as follows, assuming that the entry timing is set in the middle of the time TO.
It is expressed by the following formula.

T P ” 1.5 T o−ΔT ・・・・・・
(2) Furthermore, the count value PO during the unwinding time To is expressed as follows in relation to the reference signal fl.

Po=f 1 ·TO (3) Furthermore, the relationship between the delay time ΔT and the set value Ps at that time is as follows.

Ps・=f2・ΔT (4) Here, by substituting equations (11, (3), and (4) into equation (2) and rearranging it, the following 2 (5) is obtained. .

T p= 1.5・Po/fl~P s/f 2=
(Po-Ps)/f2 (5) Therefore, the waiting time Tp to be obtained is given as the time from when the count value PO starts counting down at the frequency of the reference signal f2 until the value reaches the set value Ps.

For example, reference signal f2=10KHz, f1=15
The frequency is set to KHz, and the delay time Δ of the locking pin 6 is
If T = 6 ms, the setting value PS"10KHzX
6ms=60 pulses. Unwinding time TO is 5 rn
s, then the count value PO" = 15K) Iz
It is determined as p=1/10KHz・(7560)=1.5m.

Structure and operation of the second embodiment Next, FIG. 4 shows an example in which the up/down counter 13, the comparator 14, and the delay time setter 17 are configured by analog circuits. The output terminals n-2 and n-1 of the counter 12 correspond to contacts 2 and 29 of the power supply terminals 26 and 27, respectively. This negative power supply terminal 2
6 is connected to one input terminal of an operational amplifier 31 through a contact 28 and a resistor 30. Further, the positive power supply terminal 27 is connected to the connection point between the contact 28 and the resistor 30 through a contact 29 and a resistor 32 having a resistance value 1/2 that of the resistor 30 described above. These resistors 30, 32 and capacitor 33 together with operational amplifier 31 constitute an integrating circuit. Note that a series-connected discharge resistor 34 and a contact 35 are connected in parallel to the capacitor 33. This contact 35 is driven by the one-shot multi-by-break 22.

On the other hand, the delay time setting device 17 includes a power source 36 and a variable resistor 37. The output terminal of the operational amplifier 31 provides an output voltage Va to an analog comparator 38, and the variable resistor 37 provides a set voltage Vs. In this example, these output voltages V
a and the set voltage Vs correspond to the count value P and the set value Ps. Therefore, this operation is analogous, but as shown in FIG. 5, is almost the same as that in FIG. 3.

Modifications of the Invention Although the above control device 11 has been described for the case where the relationship is 0.5 x unwinding time T o <delay time ΔT, even when such a relationship does not exist, the electromagnetic plunger 7 The control method is automatically switched to the same one. Also, loom 1
The device can be manually switched to a device that drives the locking pin in synchronization with the main movement of 0 and measures the length. Also unwinding time T
o may be measured by observing the unwinding period of several turns and obtaining the average value.

Effects of the Invention In the present invention, the unwinding time for a unit number of turns of weft yarn, that is, the time interval of yarn signals, is measured in advance, and the locking bin plunges into the peripheral surface of the drum at the most appropriate timing based on the unwinding time, so that the weft yarn Even if the pull-out resistance changes or the size of the balloon changes periodically, or even if the rotation speed of the loom fluctuates, the appropriate entry timing can always be set.
Stable control of the locking bottle is possible.

[Brief explanation of drawings]

Figure 1 is a schematic side view of the drum-type length measurement and storage device, Figure 2 is a block diagram of the digital controller, Figure 3 is a time chart of the controller in Figure 2, and Figure 4 is the analog type. FIG. 5 is a block diagram of the control device of FIG. 4, and FIG. 5 is a time chart diagram of the control device of FIG. 1. Drum type length measurement storage device, 2. Weft thread, 4. Arm for winding, 5. Drum for length measurement storage, 6. Locking pin, 7. Electromagnetic plunger, 11.. control device, 1
2... Counter, 13... Up/down counter as calculation section, 14... Comparator, 15... Flip-flop as storage circuit, 17... Delay time setter, 2
3...sensor, 30, 31...resistor, 31...operational amplifier. Figure 1 Figure 2

Claims (2)

[Claims] (1) Measure the time required to unwind a unit number of weft threads,
Based on this unwinding time, calculate the time from the generation of the thread signal during unwinding to the target entry timing of the locking pin, and calculate the waiting time by subtracting the delay time of the electromagnetic plunger from this time. A method for controlling a drum-type length measurement and storage device, characterized in that a drive signal is generated after the waiting time has elapsed from the time when a yarn signal is generated during a certain unwinding. (2) A counter that counts yarn signals during unwinding operation, a gate that distributes two reference signals based on the output of this counter, and an unwinding time required to unwind a certain unit number of weft yarns by integrating the reference signals. a calculation unit that measures and calculates another different reference signal from the integrated value; a delay time setting device that generates a signal corresponding to the delay time of the electromagnetic plunger;
The present invention is characterized by comprising a comparator that compares the output signal of the arithmetic unit and the signal of the delay time setter and generates a drive signal when they match, and a storage circuit that holds this drive signal for a required time. A control device for a drum-type length measurement storage device.