JPS63282061A - Sensitivity adjusting device for yarn clearer - Google Patents

Abstract

PURPOSE:To make it possible to control the sensitivity adjustment without timing pulse by providing an up-down counter and a D/A converter which operate according to the comparison result between the output signal of a detector and an amplifier, which send out an average value of output signals corresponding to the size of yarn, and the voltage of a yarn diameter standard value. CONSTITUTION:In case that there is a yarn running signal, the averaged voltage of outputs from a detector 2 and an amplifier 5 and the standard value PHI of an average diameter of yarn controlled by a yarn run director 7 are compared in a voltage comparator 8 and by its output signal V8 (comparison result), an up-down counter 10 and a D/A converter 11 are actuated and by this output, the output V5 of the amplifier 5 is always coordinated to the standard value PHIof the standard diameter of yarn. And in case that the yarn 1 has gone and a yarn running signal has gone, since the average diameter corresponding to the output V5 is already adjusted to the standard value PHI before that, the output V5 changes from the average diameter to 0v (the condition without yarn), thereafter a semiconductor switch S8 is turned off and the average value of the output V5 is adjusted to 0v.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a sensitivity adjustment device for a yarn clearer (yarn defect removal device) that is attached to a winding machine or other device to detect and remove various defects in yarn. .

[Conventional technology]

Conventionally, various sensitivity adjustment devices have been used in yarn clearers from the viewpoint of multiple parallel operations and long-term stability.

For example, in automatic thread winding machines, a timing pulse is obtained from the machine just before the thread tying operation, and the sensitivity is adjusted to a state where there is no thread for a short time just before the thread is inserted into the detector slot. ing.

[Problem that the invention seeks to solve]

However, in this conventional device, it is necessary to install a device for receiving timing pulses from the machine base on which the yarn clearer is attached, which is difficult in practice.

The present invention was made in view of the current situation, and its purpose is to eliminate the need for timing pulses from the machine base, and to improve the winding speed of several meters to hundreds of meters, as well as conventional automatic thread winding machines. It is an object of the present invention to provide a sensitivity adjustment device for a yarn clearer that can be well adapted to a frame of a spinning frame with a speed of about 500 yen.

(Means for Solving the Problems) For this purpose, the present invention provides a detector 2 and an amplifier 5 that send out an average value of output signals corresponding to the thickness of the thread, and a A voltage comparator 8 to which the output signal and the voltage of the standard yarn diameter value controlled by the yarn travel detector 7 are applied; an up/down counter 10 and a digital-to-analog converter 11 operated by the output signal of the voltage comparator 8; The detector 2 is controlled by the output of the digital-to-analog converter 11, and the average value of the output signal sent from the amplifier 5 is set to a reference value for no yarn when there is no yarn running signal. , when there is a yarn running signal, the yarn is adjusted to the reference value of the average diameter of the yarn.

〔Example〕

Preferred embodiments of the present invention will be described below along with their functions based on the drawings.

The drawing is an electrical configuration diagram showing an example of the present invention. The detector 2 that converts the variation in the diameter of the thread l into an electrical signal is a known one, and a light source 3 and a photovoltaic cell 4 are disposed opposite each other. After the thread 1 is inserted into the photovoltaic region in a stationary state, it starts running.The light source 3 is a light emitting diode, the photovoltaic cell 4 is a solar cell, and a voltage, in this example, a negative voltage Vsc, is generated by attaching a load resistor R3. It looks like this.

Note that although the light emitting diode 3 is lit by DC lighting, the same applies to pulse lighting.

Furthermore, although the detector 2 is of a photoelectric type, it may also be of a capacitance measurement type in which fluctuations in the diameter of the thread 1 are converted into electrical signals as changes in capacitance. Any method that photoelectrically converts the shadow and outputs it as an electrical signal may be used.

The output of the detector 2 is connected to an amplifier 5, and in the amplifier 5, a reference voltage Vref (for example,
Divide the constant voltage diode voltage to create 10.15V) and the voltage ■sa of the photovoltaic cell 4, and amplify the difference between these two voltages with the operational amplifier 6. If Vsc=Vref, then Output V.

= Ov.

When the yarn 1 runs, the yarn travel detector 7 amplifies and rectifies the feather and flame signals and outputs the signal v7.

In other words, when thread 1 runs, rl'' (for example, 12v)
If the thread 1 does not run, "0" (for example, OV) is output.

The output V of the amplifier 5 and the output v7 of the yarn running detector 7 are applied to a voltage comparator 8.

The voltage comparator 8 compares the output V from the amplifier 5, the voltage averaged by the signal doubler capacitor C9 and the resistor R1, and the voltage generated by the semiconductor switch S.

The semiconductor switch S has a yarn running detector 7 connected to its control terminal C.
When a signal of "1" is applied, the resistance between lN and 0UT becomes low, and the voltage of the standard yarn diameter value Φ is input to the operational amplifier 9. Also, when the control terminal C is "0", lN -0UT becomes a high resistance, and Ov is input through resistor R81.

Note that the same operation can be obtained by using a relay circuit instead of the semiconductor switch S8.

The output V of the voltage comparator 8 is applied to a binary up/down counter 10, at which the counter 10 counters up (or down), and the resistor network 7R, connected to the output terminal. The output voltage is converted to analog by a digital-to-analog converter 11 (R-2R system in this example) connected through the resistor R1□, and the light intensity of the light source 3 of the detector 2 is controlled by the output voltage of the amplifier 5. Output V,
is always the reference value without thread (0) or the reference value of the average diameter of thread (
Φ).

The oscillator 12 has a variable oscillation period, and the oscillation stopper T1□
The oscillator 12 is connected to the clock terminal GK of the up/down counter 10, and the control terminal C of the semiconductor switch S12 in the oscillator 12 is connected to the power supply O.
During the period until the device is electrically and thermally stabilized at the time of N (the time is determined by a constant 13, capacitor C13, and resistor R13), the output V x 3 (r I J signal) is added.

Next, to explain the operation, when the gold thread 1 is not in the photoelectric region of the detector 2, the output ■ of the amplifier 5 generates a signal Ov, and when the thread 1 is inserted into the photoelectric region, Φ, It is assumed that a signal of

The unit of each weight is adjusted, for example, with a semi-fixed resistor R21 so that the signal Φ has the same value for each weight, and the average of Φ5 of each unit or the voltage of Φ5 of the sample unit is adjusted by the central controller I ( (not shown), the control device determines this Φ, and sends the voltage of the standard yarn diameter value Φ to each unit.

Initially, Φ of this unit is Φ, =Φ, but it drifts in the direction of Φ, ≠Φ mainly due to the drift of the detector 2, etc.

Normally, when there is a voltage of Φ5 (not OV), the thread 1 is inserted into the photoelectric region of the detector 2, and the thread 1 is running.

Therefore, since the output v7 of the yarn running detector 7 is "1", a signal of "1" is applied to the control terminal C of the semiconductor switch S in the voltage comparator 8, and the voltage of Φ is changed to the operational amplifier 9. A voltage obtained by averaging the output vi (that is, Φ,) applied to one input and the other input is compared with Φ.

When Φ5>Φ, the light source 3 is in the direction darker than the reference value, so the output V of the voltage comparator 8 is r
lJ, the up/down counter 10 counts up, increases the current flowing to the light source 3 (light emitting diode) with the output voltage via the digital-to-analog converter 11, and controls it in the direction of Φ → Φ. do.

Also, when Φ5<Φ, the output v8 of the comparator voltage generator 8 is "
0'', the up/down counter 10 counts down, and the output voltage from the digital-to-analog converter 11 decreases the current flowing through the light source 3, thereby controlling it in the direction of Φ, →Φ.

In this way, when there is a yarn running signal, the output V of the amplifier
, is compared with the reference value Φ of the average diameter of the thread via the voltage comparator 8, and the output signal of the voltage comparator 8 operates the up/down counter 10 and the digital-to-analog converter 11, Depending on the output, the output of the amplifier ■,
is always controlled to match the reference value Φ of the average diameter of the thread.

Next time, when yarn 1 disappears and the yarn running signal disappears, Φ5 has been adjusted to Φ before that, so the only change is the voltage value with respect to the yarn thickness signal Φ, so ■, becomes Φ , →Ov.

After that, ■? becomes O, and the semiconductor switch S, becomes OF
Since the e input of the voltage comparator 8 is connected to Ov through the resistor R11, the average value of ■ is connected to Ov, so the average value of ■ is adjusted to Ov.

In this way, even without obtaining a timing pulse, characteristics similar to those of DC amplification can be obtained, and the output V of the amplifier 5 is always adjusted to either Φ or O.

Here, between the defect of gradually becoming thicker or thinner and the drift of the device, the former usually changes faster, so the clock corresponding to the drift of the device, for example, once every 10 seconds (determined by the capacitor C12 and the resistor R12) It is necessary to perform a slow correction of

Furthermore, by increasing the discrimination ability of the up/down counter 10, the magnitude of the signal that changes with one clock can be made smaller than the yarn diameter signal.

In this embodiment, the up/down counter 10, the digital-to-analog converter 11, and the oscillator 12 are digitally processed to perform digital-to-analog conversion to control the light source 3 (light-emitting diode) of the detector 2. It is also possible to use an analog type that uses the accumulated charge of a capacitor, but in this case, the key is to use a capacitor with low leakage current.

In addition, since the present invention is based on the assumption that drift is usually small,
After the power is turned on, the clock is accelerated through the circuit 13 for, for example, 10 minutes until the device becomes thermally and electrically stable, so as to cope with early drift.

In addition, in the present invention, the machine may be stopped while the yarn 1 is still in the photoelectric range of the detector 2. In this case, when the yarn 1 enters the detector 2, the yarn running signal 7 becomes O, and there is no yarn. If an attempt is made to adjust to the state (Ov), a malfunction will occur because the values will be different when the yarn 1 runs again.

Therefore, in order to prevent this problem, a voltage level is applied to the oscillation stop terminal T1□ of the oscillator 12 from the central controller (not shown), and when the machine is stopped, the voltage level is applied to the oscillation stop terminal T1□ of the oscillator 12.
The oscillator 12 is stopped by setting □ to rOJ, and at this time, the clock oscillation is stopped and the drift is not corrected.The voltage that can be used for such an oscillation stop terminal T1□ is the voltage applied to the cutter (not shown). Voltage is available.

That is, the machine may normally be stopped while the yarn clearer is energized, and during inertia rotation until the machine stops, a short length of the machine may be equivalently long and detected by the detector, resulting in malfunction. Therefore, in order to prevent this, the voltage applied only to the cutter device section may be cut off when a signal is obtained from such a timing device or when rotation is detected and the rotation speed falls below a certain limit value. , the voltage applied to this cutter can be used.

〔Effect of the invention〕

According to the present invention, not only is no timing pulse required for sensitivity adjustment, but the sensitivity is controlled in a manner similar to direct current amplification, which eliminates the characteristic of conventional AC amplification, which is susceptible to gradual changes. can also be covered.

In addition, because it is close to DC width increase, it is possible to
The industrial value of the present invention is remarkable because it can be applied not only to spinning machines (200 m/min) but also to machines with speeds of the order of several meters to several hundred m/min.

[Brief explanation of drawings]

The drawing is an electrical configuration diagram of an example of a sensitivity adjustment device for a yarn clearer according to the present invention. 1... Thread 2... Detector 5... Multiplier 7... Yarn traveling detector 8... Voltage comparator 10... Up/down counter 11... Digital-to-analog converter 12 ...oscillator

Claims (1)

[Claims] 1. A detector and an amplifier that send out an average value of an output signal corresponding to the thickness of the yarn, and a yarn diameter standard that is controlled by the output signal of the amplifier and a yarn running detector. a voltage comparator to which a voltage of a value is applied, an up/down counter operated by an output signal of the voltage comparator, and a digital-to-analog converter, and the detector is controlled by the output of the digital-to-analog converter. The average value of the output signal sent from the amplifier is adjusted to the reference value for no thread when there is no thread running signal, and to the reference value for the average diameter of the thread when there is a thread running signal. Yarn clearer sensitivity adjustment device featuring: 2. The clock from the oscillator connected to the clock terminal of the up/down counter is controlled by an output signal from a signal generation circuit for accelerating the cycle of the oscillator until the device is electrically and thermally stabilized when the power is turned on. The average value of the output signal of the amplifier is immediately adjusted to the reference value without thread when the power is turned on, and this state is continued until the device reaches an electrically and thermally stable state. Range 1
Sensitivity adjustment device for yarn clearer as described in section. 3. If a signal from the machine is applied to the oscillation stop terminal of the oscillator to stop clock oscillation, and the machine stops operating with the thread still in the detector, the output signal of the amplifier The yarn clearer sensitivity adjustment device according to claim 1, wherein the average value of is not corrected to the reference value without yarn.