JP2750751B2 - Switching method of yarn feeder - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for electrically detecting a switching state of a yarn feeder during weaving.

[Conventional technology]

In order to omit the frequent replenishment operation of the yarn feeder, a plurality of yarn feeders are previously set on the loom in a knotted state.

The invention of Japanese Patent Application Laid-Open No. 63-42940 changes the fluid pressure of the weft insertion main nozzle, the fluid ejection period, etc., in order to respond to the change in the yarn winding when the yarn feeder is switched. We realize horizontal insertion state. In such optimal control, the detection of the switching state of the yarn supplying body is premised.

Conventionally, the switching state of the yarn feeder is set between two yarn feeders.
The yarn is sandwiched between two clampers, the yarn and a limit switch or a proximity switch are interlocked between the clampers, and the switching state is detected by the output of this switch.

[Problems of the prior art]

In this conventional detecting means, the yarn is frictionally held by a clamper or the like, and an appropriate tension is applied therebetween.

For this reason, depending on the type of yarn, excessive tension is applied to the yarn at the time of switching of the yarn supplying body, and there is a possibility that the yarn may be damaged or broken.

[Object of the invention]

Accordingly, an object of the present invention is to prevent the yarn from being damaged or the yarn being broken, and to be able to electrically and reliably detect the switching state of the yarn supplying body in a non-contact state.

[Solution of the Invention]

Based on the above object, the present invention provides a ballooning speed of a yarn unwound from a yarn supplying body in a winding axis direction, in other words, a peripheral speed of a yarn unwound, a voltage, a time per unit unwinding winding number,
Alternatively, it is detected as the number of unwinding windings per unit time, and based on the comparison between the detected ballooning speed and the threshold value, the rapid change rate of the ballooning speed, or the comparison result between the ballooning speed change amount and the standard change amount, The switching state of the thread is detected.

As described above, in the present invention, the ballooning speed of the yarn unwound from the yarn supplying body is detected as a voltage, a time, or the like, and is electrically determined based on a magnitude comparison between the detected value and the threshold value or a sudden change, and the like. Since the switching state is detected under the non-contact state, excessive tension is not applied to the yarn in the detection process, and yarn breakage and yarn damage are eliminated.

[Embodiment 1] This embodiment 1 is shown in FIGS. 1, 2, 3 and 4.
The figure shows an example in which ballooning speed is detected as a voltage and this voltage is directly compared with a threshold value.

As can be seen in FIG. 1, the thread 1 for weft insertion is
For example, the yarn is tied between two yarn supply bodies 21 and 22, unwound from one yarn supply body 21 in the winding axis direction, passes through a ring-shaped detector 3 also serving as a yarn guide, and is used as a length measurement storage device 4. , Where the length is measured only for the length required for weft insertion of one pick, and stored until the weft insertion timing. At the weft insertion timing, the length is withdrawn from the length measuring and storing device 4, and the weft is inserted into the warp opening by the weft insertion nozzle 5. It is put in.

As shown in FIG. 2, the detector 3 is of a photoelectric type, and the light emitter 6 and the light receiver 7 are optically opposed to each other on the diameter line of a guide hole 31 such as a transparent ring. The guide hole 31 is determined by the ballooning speed N (rpm), that is, the rotational speed in the circumferential direction when the yarn 1 is unwound from the yarn supplying body 21 in the winding axis direction.
In the process of being pulled out while rotating and moving along the inner circumference of the light source, the light from the light projector 6 is shielded twice each time it makes one round. Therefore, the light projector 7 generates a pulse signal P having a pulse frequency proportional to the ballooning speed N according to the light blocking state, and sends the pulse signal P to the signal processing unit 20.

The electric pulse signal P is, as shown in FIG.
Inside the signal processing unit 20, the signal is amplified by an amplifier 8 having a waveform shaping function, and is converted by an F / V converter 9 into a voltage V proportional to the pulse frequency, that is, a voltage V corresponding to the ballooning speed N. As the yarn 1 is consumed, the winding diameter of the yarn supplying body 21 decreases. Therefore, as shown in FIG. 4, the voltage V of the ballooning speed N is the minimum value at the time of the maximum winding diameter on the time t axis. To the maximum value at the time of the minimum winding diameter, and gradually increases, and at the time of the yarn feeding change, the minimum value again corresponds to the maximum winding diameter, so that a triangular wave is formed. This voltage V is sent to one input terminal of the comparator 10 and compared with the threshold value Vs of the other input terminal.

Here, the threshold value Vs is given by the calculator 12. Calculator 12, the minimum winding diameter D _o (mm) ballooning speed N _o by voltage V _o when the, as the fluctuation value [Delta] V, weaving data defined by the setter 11, the value is input at all times by the predetermined or measured Of the loom n (rp
m] and the length measurement amount L [mm] per pick and the pi are obtained by the following formula.

_{Vs = V o -ΔV V o =} nL / πD o ∴Vs = nL / πD o -ΔV comparator 10 intermittently, compares the magnitude relationship between the voltage V and the threshold value Vs, when the V ≧ Vs For example, an "L" level output is generated, but when V <Vs, an "H" level yarn feed change signal S is generated and sent to one input terminal of the AND gate 13. Here, the AND gate 13 receives the "H" level operation signal W from the loom control system as an input, passes the yarn supply change signal S only during operation, and sends it to the weft insertion control system and the like.

In this way, the switching state of the yarn supplying bodies 21 and 22 is
It can be detected electrically by comparing the voltage V of the ballooning speed N with the threshold Vs.

In the above formula, instead of the product of the rotation speed n of the loom and the length measurement amount L per pick, the length measurement storage device 4 is used.
The rotation speed on the outlet side of the rotating yarn guide that constitutes the above may be used.

In the above embodiment, for example, the yarn feeder 21 first moves the yarn 1
Is pulled out, the yarn feed change signal S is output even though the yarn feeder 21 is not switched at first.

For this reason, as shown in FIG. 5, the output of the comparator 10 is branched and connected to the set input side of a flip-flop 102 via a one-shot multivibrator 101 which outputs a one-shot at the falling edge of the signal. The output is output to the AND gate 13 on the output side of the loop 102. Further, a push button switch 103 is connected to a reset input side of the flip-flop 102. According to such a configuration, when the first yarn feeder 21 is consumed to some extent and the yarn feed change signal S changes to the "L" level, the flip-flop 102 is set for the first time. Can be output from the AND gate 13, so that the above-mentioned problem is solved.

Embodiment 2 This embodiment 2 is shown in FIGS. 6 and 7, and is an example in which yarn feed change is detected from ballooning speed, that is, a rapid change rate of voltage.

The pulse signal P from the detector 3 is amplified by an amplifier 8, converted to a voltage V at a ballooning speed N by an F / V converter 9, and input to a differentiating circuit 14. Here, the differentiating circuit 14 outputs a differentiated signal d by differentiating the voltage V with respect to time, and sends it to a timer 15 comprising a one-shot circuit. This differentiated signal d hardly changes after the yarn feed change, but at the time of the yarn feed change, it corresponds to the sudden drop of the voltage V of the ballooning speed N, becomes a large spike voltage, and operates the timer 15 for a certain period of time. A width timer output is output and sent to the AND gate 13 as a yarn feed change signal S.

Therefore, similarly to the first embodiment, the AND gate 13
Outputs a yarn feed change signal S at the time of yarn feed change using the operation signal W as an input condition.

Third Embodiment As shown in FIGS. 8 and 9, the third embodiment is an example in which the yarn feed change is detected from the amount of change in the voltage V of the ballooning speed N over time.

That is, the voltage V is sent to one input terminal of the sampling comparator 16. The sampling comparator 16 stores the voltage V at a predetermined sampling period, calculates the difference between the voltage V at the previous sampling and the voltage V at the current sampling, and calculates the difference and the fluctuation input from the setting unit 11. A magnitude comparison with the value ΔV is performed, and when (current voltage V−previous voltage)> fluctuation value ΔV, an “H” level yarn feed change signal S is generated and sent to the AND gate 13.

On the other hand, a differentiating circuit 17 generates a spike (differential) signal by differentiating the pulse signal P, and a timer circuit 18
Has been sent to. The timer circuit 18 is constituted by, for example, a one-shot circuit, and inputs a spike (differential) signal during the unwinding operation and continues a signal having a pulse width larger than its output period as shown in FIG. In this way, the "H" level unwinding signal R is continuously generated while the yarn 1 is unwound from the yarn supplying body 21 or 22 and is sent to the AND gate 13. . Therefore, the AND gate 13 passes the yarn feed change signal S on condition that a normal unwinding operation such as during the operation of the loom is performed.

Embodiment 4 As shown in FIG. 10, this embodiment 4 shows a detection method in the case of multi-color filling.

That is, in the case of multi-color, the signal processing unit 20 of the first, second, or third embodiment is attached to each thread 1.
The selection device 19 outputs a weft yarn selection signal C in accordance with a predetermined weft insertion pattern in synchronization with the rotation of the loom. And each output side AND gate 13
Is configured to output a yarn feed change signal S using a selection signal C as an input condition in addition to the operation signal W or the unwinding signal R. Therefore, the yarn feed change signal S of each yarn 1 is output only during the selection of the yarn 1, in other words, the “H” level selection signal C, the operation signal W or the unwind signal R from the selection device 19.
Is output only when is input.

Fifth Embodiment A fifth embodiment is an example in which the ballooning speed N is detected as the time T as shown in FIG. 11, and corresponds to the first embodiment, but can be applied to the second and third embodiments. .

The pulse signal P is supplied to a differentiating circuit 23 and a one-shot circuit
24, the flip-flop 25 at the rising edge of the signal
Is set to the ON state, the counter 22 is set to the ON state, and the pulses from the reference pulse train generator 26 are counted. On the other hand, this pulse signal P is input to the counter 21 via the amplifier 8. When the count value of the counter 21 reaches a preset value, the counter 22 is set to an off state, the flip-flop 25 is reset,
The counter 21 itself is also set to the reset state.
In this way, the counter 22 counts the reference pulse over a period corresponding to the generation state of the pulse signal P, and sends the output to the comparator 27 as the time T. Where the comparator
27, calculator 29 set a standard time T _o and the magnitude comparison by, will generate a weft feed switching signal S. In addition,
The reference time T _o is given is calculated by calculator 29 based on the time set by the setter 28 [Delta] T.

[Other embodiments]

By calculating the outer diameter D of the yarn feeders 21 and 22 from the ballooning speed N and the pull-out speed of the yarn 1 (the rotation number of the loom × the length measurement amount in the embodiment), and detecting the fluctuation of the outer diameter D , It is also possible to detect a yarn feed change. Further, the withdrawal speed may be used as information for calculation using a directly measured value.

[Effects of the Invention] In the present invention, the ballooning speed is converted into a voltage, the magnitude of the voltage and the threshold value are compared, and the yarn feed change state is detected by electrical signal processing from the rate of change or the amount of change in the voltage. Therefore, a complicated mechanical device such as a clamper or a limit switch is not required, and the detection becomes easy.

In particular, in the detection process, it is not necessary for the yarn to be passed between the clampers with a predetermined tension, and there is no need to contact a limit switch or the like with the yarn. Damage of the yarn at the clamper portion, breakage of the yarn, and the like can be prevented.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a yarn feeding process, FIG. 2 is a front view of a detector,
FIG. 3 is a block diagram of the first embodiment, FIG. 4 is an explanatory diagram of signals of the first embodiment, FIG. 5 is another block diagram of the first embodiment,
6 is a block diagram of the second embodiment, FIG. 7 is an explanatory diagram of signals of the second embodiment, FIG. 8 is a block diagram of the third embodiment, and FIG.
FIG. 10 is an explanatory diagram of signals in the third embodiment, FIG. 10 is a block diagram of the fourth embodiment, and FIG. 11 is a block diagram of the fifth embodiment. DESCRIPTION OF SYMBOLS 1 ... Thread, 21, 22 ... Thread supply body, 3 ... Detector, 4 ... Dimension measuring storage device, 5 ... Weft insertion nozzle, 6 ... Floodlight, 7
…… Receiver, 8 …… Amplifier with waveform shaping function, 9… F /
V converter, 10… Comparator, 11… Setter, 12… Calculator, 13… And gate, 14… Differentiation circuit, 15… Timer, 16… Sampling comparator, 17… Differential Circuit, 18 ...
... Timer circuit, 19 ... Selection device, 20 ... Signal processing unit.

 ──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Kensuke Wakamatsu 593-1, Aiki-cho, Matsuto City, Ishikawa Prefecture (56) References JP-A-3-119146 (JP, A) JP-A-2-104747 (JP, A) JP-A-64-52848 (JP, A) JP-A-63-126945 (JP, A) JP-A-58-191248 (JP, A) Japanese Utility Model Laid-Open No. 59-95179 (JP, U)

Claims (5)

(57) [Claims] A yarn feeding change signal is detected by detecting a ballooning speed of a yarn unwound from a yarn supplying body in a winding axis direction and comparing the detected ballooning speed with a threshold value corresponding to yarn supply switching. A method for detecting a change of a yarn supplying body, characterized by detecting 2. A feeding method comprising detecting a ballooning speed of a yarn unwound from a yarn supplying body in a winding axis direction, and detecting a yarn supply change signal from a sudden change rate of the detected ballooning speed. Thread body switching detection method. 3. A ballooning speed of a yarn unwound from a yarn supplying body in a winding axis direction is detected, and a difference between the detected ballooning speed and a previously detected ballooning speed is obtained at a predetermined sampling cycle. Is compared with a threshold value of the amount of change, and a yarn feed change signal is detected from the change in the magnitude relationship. 4. A switching state of a yarn feeder is detected only during operation of a loom from two AND conditions of a yarn feed change signal and an operation signal of a loom.
Item 4. The method for detecting a yarn feeder switching according to Item 2, Item 3 or Item 3. 5. A method for detecting a yarn feeder switching state for a selected yarn during operation of a loom from three AND conditions of a yarn feed change signal, an operation signal of a loom, and a selection signal. 4. The method according to claim 1, wherein the yarn feeder is switched.