JP2937352B2 - Winding diameter calculation method and its device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a process for drawing a yarn from a yarn feeder in an axial direction of a yarn feeder in a textile machine such as a warp warping machine, a warp sizing machine and a loom. Accordingly, the present invention relates to a technique for calculating the winding diameter of a yarn supplying body by calculation.

[Conventional technology]

In the process of pulling out the yarn from the yarn supplying body, the winding diameter of the yarn supplying body is
It gradually decreases. When this winding diameter decreases, the size of ballooning also changes, so that even with the same type of yarn, the yarn pull-out resistance gradually increases. Therefore, in order to keep the tension constant, it is necessary to control the tension of the yarn, the position of the yarn guide, and the like. However, these controls are all based on the measurement of the winding diameter.

For example, in the invention of Japanese Utility Model Laid-Open No. 60-67386, a plurality of photoelectric sensors are provided in the radial direction of the yarn feeder, and the outer diameter of the yarn feeder is measured by a signal from the photoelectric sensor. However, according to this measuring means, the measurement accuracy of the winding diameter is limited by the number of photoelectric sensors installed, the measured value is coarse, and the measurement accuracy required for tension control cannot be obtained.

Further, in the invention of Japanese Utility Model Application Laid-Open No. 64-570, a distance sensor is installed facing the outer surface of the yarn supplying body, and the winding diameter is indirectly measured by the output of the distance sensor. However, also in such a measurement, as in the above-described conventional example, the measurement becomes inaccurate and cannot be used for predetermined control as it is.

[Object of the invention]

Therefore, an object of the present invention is to make it possible to accurately measure the winding diameter of a yarn feeder by utilizing the phenomenon that when the yarn is pulled out from the yarn feeder in the axial direction of the yarn feeder, the yarn is unwound while rotating. It is to be.

[Solution of the Invention]

With the above object, the present invention is directed to a yarn feeder that draws a yarn from a fixed yarn feeder in the axial direction of the yarn feeder,
The length of the yarn drawn from the yarn supplying body and the number of unwinding windings corresponding thereto are obtained, and the winding diameter of the yarn supplying body is calculated from these values. Further, the present invention relates to a yarn feeder for drawing a yarn from a yarn feeder in the axial direction of the yarn feeder, detects a pull-out speed and a ballooning rotation speed of the yarn drawn from the yarn feeder, and detects the yarn feeder from these values. Is calculated.

[Configuration of the invention]

FIG. 1 shows a winding diameter calculating device 1 according to the present invention in relation to a yarn feeding device 2.

The yarn feeder 2 is installed in a textile machine such as a warp warper, a warp sizing machine and a loom, and includes a plurality of yarn feeders 3. The yarn supplying body 3 is fixed so as not to rotate around the axis. The yarn 4 is fixed to the thread supply body 3
From the yarn feeder 3 in the axial direction, and is supplied through the yarn guide 5 while ballooning.

The winding diameter calculation method of the present invention uses the yarn feeder 3
In the axial direction of the yarn supplying body 3, the length of the yarn 4 pulled out from the yarn supplying body 3 and the number of unwinding windings corresponding thereto are determined, and the winding diameter of the yarn supplying body 3 is determined from these values. Is calculated. The winding diameter calculation device 1 of the present invention is assembled by a pull-out speed detector 6, a ballooning rotation speed detector 7, and a winding diameter calculator 8.

The withdrawal speed detector 6 directly detects the withdrawal speed V of the yarn 4, that is, the withdrawal length L per unit time T, or indirectly detects the withdrawal speed from the operating speed of a warp warper, a warp sizing machine and a loom. I do. In the process of pulling out the yarn 4 from the yarn supplying body 3, the ballooning rotation speed detector 7 sets the ballooning rotation speed to the number of unwindings N per unit time T or the unwinding of a unit number of turns, for example, one winding unwinding. Measure from time t.

The winding diameter calculator 8 is connected to the pull-out speed detector 6 and the ballooning rotation speed detector 7, and obtains the winding diameter D of the yarn supplying body 3 based on a predetermined arithmetic expression.

In the process of pulling out the yarn 4 from the yarn supplying body 3, the pull-out speed detector 6 detects the pull-out speed V = L / T indirectly or directly from the pull-out length L per unit time T. On the other hand, the ballooning rotation speed detector 7 observes the ballooning phenomenon (movement) of the yarn 4 near the yarn guide 5 and detects the number of rotations (rotation speed) of the yarn 4 per unit time T, that is, unwinding. The number of turns N is detected.

Here, the pull-out length L of the yarn 4 during a certain unit time T
And the unwinding length are equal, the following equation holds.

L = VT = NπD Accordingly, the winding diameter D of the yarn supplying body 3 can be calculated from the following equation.

D = L / (Nπ) (1) Then, the winding diameter calculator 8 obtains the winding diameter D from the above formula every time the unit time T elapses.

In this manner, the winding diameter D of the yarn supplying body 3 can be accurately measured from the correlation between the drawn length L and the number of unwinding windings N.

Embodiment 1 In Embodiment 1, as shown in FIG. 2, the winding diameter D of the yarn supplying body 3 is measured, and the position of the yarn guide 5 is controlled based on the measured value, so that the ballooning movement is performed. Is positively changed, and the pull-out resistance of the yarn 4, that is, the tension of the yarn 4 is controlled to be substantially constant regardless of the change in the winding diameter D.

In the process of pulling out the yarn 4, the unwinding number N is determined by the unwinding number detector 9 serving as the ballooning rotation speed detector 7, that is, a ballooning sensor, for example, a pair of a light emitter 11a and a light receiver 11b.
In addition, it is detected by the waveform shaping circuit 12 and the counter 13 as the number of pulses. Here, since the light receiver 11b detects the yarn 4 in the ballooning motion twice during unwinding of one winding, the unwinding winding number N is 1/2 of the pulse number. The output pulse of the light receiver 11b passes through the waveform shaping circuit 12 and is input to the counter 13 as a value representing twice the number of unwindings N.

On the other hand, the pull-out speed detector 6 is constituted by an encoder 14 and a counter 15 attached to the rotating shaft of the textile machine rotating in proportion to the yarn speed. Is indirectly determined as the yarn drawing speed V.

Then, the setter 21 for the unit time T, for each unit time T,
The counters 13 and 15 are reset by a reset signal, and a calculation command is given to the winding diameter calculator 8.

Therefore, the winding diameter calculator 8 sets each counter 13 before reset,
From the output value of 15, ie, the value 2N twice the number of unwinding windings N, and the drawing speed V, the winding diameter D is obtained based on the above formula and sent to the motor controller 16.

As a result, the motor controller 16 drives the driver 17 and controls the rotation amount of the feed motor 18 according to the change in the winding diameter D. The feed motor 18 rotates the feed screw 19 and moves the feed nut 20 and the bracket 25 in the direction in which the yarn 4 is pulled out, thereby moving the yarn guide 5 and the unwinding winding number detector 9. Usually, when the winding diameter D of the yarn supplying body 3 decreases, ballooning becomes small. Therefore, the feed motor 18 moves the yarn guide 5 in a direction approaching the yarn supplying body 3 to reduce the pull-out resistance generated by ballooning. It is controlled so that it is almost constant.

Example 2 Example 2 is an example in which the winding diameter D is measured from the time t required for unwinding one turn, as shown in FIG.

When the single yarn 4 is unwound from the yarn supplying body 3 with a ballooning motion, the light emitting and receiving device 11 as a ballooning sensor generates two pulse signals. 2 at this time
The time width of one pulse signal is the time required for unwinding one turn. At the time of measuring the winding diameter D, for example, an “H” level command signal is input to one input terminal of the AND gate 22. Therefore, the AND gate 22 sends a pulse signal to the time measuring device 10 such as a timer at the measurement timing.
Here, the time measuring device 10 measures the time t required for unwinding one turn, and sequentially outputs the time t. Therefore, the winding diameter calculator 8 calculates
In addition to inputting some measured times t and obtaining the time required for unwinding one roll as an average value, for example, 1
[Second] The winding diameter D is calculated from the following formula using the drawing length per interval, that is, the drawing speed V as an input.

D = V / π Here, the above equation is obtained by N = 1, L = ·
It is equivalent to V substituted.

When the yarn supplying body 3 is wound with a constant twill angle θ, the winding diameter D is approximately expressed by the following equation in consideration of the winding diameter D.

D = (V / π) cos θ This trigonometric function can also be input to the winding diameter calculator 8 by the setting unit 23 as a constant in advance. The reason for correction of cos θ is as follows. The fact that the yarn feeder 3 is wound with the twill angle θ means that the yarn 4 is spirally wound on the sheet feeder 3 at the same lead angle as the twill angle θ. Accordingly, when one thread of the yarn 4 is unwound from the yarn supplying body 3 having the winding diameter D, the length of the unwound yarn is πD / co of the spiral length.
s θ, which is 1 / cos θ times that when the twill angle θ is 0 degree. If the calculation is performed in such a manner, more accurate measurement can be performed. Here, the winding diameter D is determined by the average value (time) of the time t required for unwinding one roll, but it may be simply determined by one measurement value (time t).

[Other embodiments]

In the above-described embodiment, the pull-out speed V is indirectly measured by the encoder 14 or the like. However, the pull-out speed detector 6 is configured using, for example, a laser Doppler velocimeter that directly detects the yarn pull-out speed. Can also.
In the case where the yarn 4 of the yarn supplying body 3 is pulled out by the length measuring and storing device, the rotation amount per unit time of the rotating yarn guide that winds the yarn 4 around a length measuring roller or a fixed drum as a component thereof is determined. It is also possible to determine the drawing speed V of the yarn 4 from the relationship between the measured value and the preset radius of rotation.

Further, as another method, the winding diameter D may be calculated by detecting the number of unwinding windings N per unit drawing length Lo. That is, as shown in FIG. 4, when the output of the counter 150 becomes equal to the set value set in the setter 90, the comparator 100 outputs a calculation command to the winding diameter calculator 18 and each counter 130, 150 may be reset, and based on this, the winding diameter calculator 18 may calculate the winding diameter D from the count value 2N of the counter 130 before reset and the unit draw-out length Lo.

The signal of the winding diameter D can be used not only as a signal for controlling the tension but also as a command for replacing the yarn supplying body 3. That is, the determined winding diameter D of the yarn supplying body 3
Can be used as a signal for issuing a yarn feeder replacement command when becomes smaller than the value corresponding to the winding diameter D of the yarn feeder 3 immediately before the completion of consumption.

Note that the withdrawal speed V is not limited to actually detected by the speed detector 6, and if the withdrawal speed V is fixed, a speed setting device is provided in place of the speed detector 6 to set the speed in advance. You may leave. For example, in the case of a loom,
If the measured length of the weft yarn per pick is L and the rotation speed of the loom main shaft is N, the drawing speed V may be set as L = N.

〔The invention's effect〕

In the present invention, in the process of pulling out the yarn from the fixed yarn feeder, the winding diameter is calculated from the relational expression between the yarn pull-out length and the number of unwinding windings on the yarn feeder side. As a result, the reliability of the measured value is improved.

In particular, in the process of pulling out the yarn from the yarn supplying body in the axial direction of the yarn supplying body, in the state where the ballooning phenomenon occurs, the unwinding winding number or the ballooning rotation speed directly related to the phenomenon is detected in a non-contact state. Therefore, it can be effectively used as information such as tension control directly related to pull-out resistance generated by ballooning motion and other yarn feed change detection control.

[Brief description of the drawings]

FIG. 1 is a block diagram of a winding diameter calculating device according to the present invention, FIG. 2 is a block diagram of a first embodiment, FIG. 3 is a block diagram of a second embodiment, and FIG. 4 is a block of another embodiment. FIG. 1 ... winding diameter calculating device, 2 ... yarn feeding device, 3 ... yarn feeding body,
4 Thread, 5 Thread guide, 6 Draw-out speed detector, 7 Ballooning rotation speed detector, 8 Thread diameter calculator, 9 Thread unwinding number detector, 10 Time measurement Container, 11…
... Emitter and receiver.

Claims (4)

(57) [Claims] In a yarn feeding device for drawing a yarn from a fixed yarn feeder in an axial direction of the yarn feeder, a length of the yarn drawn from the yarn feeder and a corresponding number of unwinding windings are determined. And calculating a winding diameter of the yarn supplying body from the value of the diameter winding. 2. A yarn supplying device for extracting a yarn from a fixed yarn supplying body in an axial direction of the yarn supplying body, wherein a yarn pulling speed detector for detecting a yarn pulling speed, and a ballooning around the yarn supplying body. A ballooning rotation speed detector that detects the ballooning rotation speed of the yarn to be drawn, and a calculator that calculates the winding diameter of the yarn supply body from a winding diameter calculation formula using the pulling speed and the ballooning rotation speed from these speed detectors as inputs. And a winding diameter calculating device. 3. The winding diameter calculating device according to claim 2, wherein the ballooning rotation speed detector is constituted by an unwinding winding number detector and a unit for setting a unit time T. 4. The winding diameter calculating device according to claim 2, wherein the ballooning rotation speed detector is constituted by a time measuring device required for unwinding one turn.