JPH073552A - Standard pulse generator - Google Patents

Abstract

PURPOSE:To provide a standard pulse generator capable of generating standard pulses of from a low frequency to a high frequency using an inexpensive apparatus. CONSTITUTION:This standard pulse generator is provided with a detection pulse generation part 50 to generate one detection pulse for each rotation of a winding drum 35, a 1st standard pulse generation part 51 to output the 1st standard pulse by receiving the detection pulse transmitted from the detection pulse generation part and a 2nd standard pulse generation part 39 to equally divide the period of the detection pulse and output the divided pulses as the 2nd standard pulses.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for generating a reference pulse that increases or decreases in accordance with the winding speed for the purpose of increasing the resolution of yarn unevenness detection, and in particular, it is an inexpensive device from low speed to high speed. The present invention relates to a reference pulse generator capable of correspondingly generating a reference pulse.

[0002]

2. Description of the Related Art An automatic winder is provided with a multi-weight winding unit for winding a yarn, and one constant length control device controls the multi-weight winding unit. The winding unit includes a winding drum that rotates in contact with the winding package, and the winding drum rotates to rotate the winding package to wind the yarn around the winding tube. ing. The speed of the yarn traveling from the yarn supplying bobbin to the winding package is proportional to the speed of rotation of the winding drum.

The fixed length control device calculates the winding yarn length from the number of rotations of the winding drum of each winding unit to determine whether the winding package is full or not, and when the winding package is full, the winding is performed. It is designed to stop the drum. To do this, the winding unit is provided with a rotation speed sensor for detecting the rotation speed of the winding drum. The rotation speed sensor outputs a detection pulse according to the rotation of the winding drum.

On the other hand, the winding unit has a function of preventing the defective yarn from being wound. In particular,
The winding unit is equipped with a yarn clearer (hereinafter referred to as clearer), which monitors the thickness of the running thread and detects defects from the size of the thread and the length of the continuous thread. At the same time, when the defect is detected, the thread is cut. This removes the defective portion of the yarn so that the defective package is not wound into the wound package.

The above-mentioned clearer evaluates not only the thickness of the thread but also the length of the thread. The thickness can be detected by the sensor in the clearer, but the information about the length is provided from the outside. Need to get Therefore, a pulse serving as a length reference is given. Since the yarn is running, the length of the run is indicated by the number of reference pulses received during that time. Considering that the traveling speed changes, the frequency of the reference pulse is preferably proportional to the winding speed so that the period of the reference pulse is a unit indicating the length of the yarn. The winding speed can be represented by the frequency of the detection pulse of the rotation speed sensor. Therefore, the detection pulse of the rotation speed sensor is the reference pulse of the clearer.

In recent years, a clearer having an increased frequency of a reference pulse has been used in order to make the clearer detection ability have a high resolution with respect to the length. If the defect of the yarn is evaluated in a short time and the yarn is not cut immediately, the defect portion will be wound into the winding package. Therefore, the frequency of the reference pulse should be high. Therefore, in order to detect the rotation of the take-up drum and give the clearer a high-resolution reference pulse according to the take-up speed, the take-up drum is provided with an impeller that rotates in synchronization. It is composed of a rotating body in which a large number of protruding blades are arranged at a predetermined interval in the circumferential direction. The presence or absence of this blade is detected by a rotation speed sensor such as a proximity sensor, and a detection pulse is output for each detection. Was trying to get a pulse of. For example, if there are 60 blades, 60 pulses can be obtained for one rotation.

[0007]

However, since the impeller having a large number of blades is required as described above, the cost becomes high. The cost of an automatic winder increases considerably if one winder is provided for each winding unit.

Further, the fixed length control device requires a detection pulse corresponding to one rotation of the drum. However, since it is useless to use two types of rotation sensors, the detection pulse by the impeller is divided to generate a detection pulse corresponding to one rotation. For example, if there are 60 detection pulses for each rotation, this is divided by 60 to generate a pulse for the fixed length control device once for each rotation. Conventionally, this frequency division is performed by a sequencer.

The sequencer is provided for each winding unit and controls each part of the winding unit. The frequency dividing process is executed in the interrupt process triggered by the detection pulse. However, as the number of revolutions increases, the frequency of interrupts increases, and the processing time allowed for one interrupt processing decreases. For example, the winding speed is 14
At 00 m / min, the detection pulse cycle is 0.2 mse
Since it is c, the time assigned to the frequency division is very short when other processing is taken into consideration, and the processing may not be in time.

If the CPU processing speed of the sequencer is increased, the processing time is shortened, but the price of the sequencer is increased. In order to reduce the cost of the automatic winder, there is a demand to use an inexpensive sequencer because the sequencer may have a low capacity, and thus it is inconsistent to desire the reduction of processing time.

When it is desired to attach the above-mentioned high-resolution clearer to an existing automatic winder equipped with a clearer whose reference pulse is every one revolution, it is necessary to newly install an impeller. This modification is troublesome.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems and to provide a reference pulse generator capable of generating a reference pulse at a low speed to a high speed with an inexpensive device.

[0013]

In order to achieve the above object, the present invention provides a first reference pulse corresponding to a winding speed,
In a reference pulse generator that generates a second reference pulse corresponding to a multiple of the winding speed, a detection pulse generator that generates one detection pulse for each rotation of the winding drum,
A first reference pulse generating section that outputs the detection pulse from the detection pulse generating section as a first reference pulse, and a first reference pulse generating section that equally divides the cycle of the detection pulse to form a divided pulse and outputs the second reference pulse. And two reference pulse generators.

[0014]

With the above structure, the detection pulse generating section generates one detection pulse for each rotation of the winding drum. Since the first reference pulse generator outputs the detection pulse as the first reference pulse, the first reference pulse represents the rotation speed of the winding drum.

On the other hand, the second reference pulse generating section produces an equal pulse obtained by equally dividing the period of the detection pulse and outputs it as the second reference pulse. The number of equal parts may correspond to the number of blades of the impeller described above. The second reference pulse corresponds to the winding speed and is a high resolution reference pulse.
Therefore, the impeller is unnecessary.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

In the automatic winder 41 shown in FIG. 2, a fixed length control device 42 is provided at one end, and multiple winding units 43 are arranged from the side adjacent to the fixed length control device 42 to the other end. The single fixed length control device 42 monitors and controls the multi-weight winding unit 43.

As shown in FIG. 3, the winding unit 43 is constructed so that the yarn supplying bobbin 31 for supplying the yarn is held below and the winding tube 32a for winding the yarn is held above. . The yarn drawn from the yarn supplying bobbin 31 is wound around the winding tube 32a. A clearer (yarn monitoring device) 33, a splicer 34, and a winding drum 35 are provided between the yarn supplying bobbin 31 and the winding package 32.

The take-up drum 35 is a cylindrical drum in which spiral grooves in opposite directions intersect with each other, and guides the yarn in these grooves, and is therefore also called a traverse drum. The winding drum 35 is rotationally driven by a drive device 36 such as an inverter motor. The winding tube 32a is a winding drum 35.
It is installed with the shaft inclined.

The sequencer (controller) 37 controls each part of the winding unit 43. That is, when the yarn supplying bobbin 31 becomes empty, the yarn supplying bobbin 31 is replaced and the yarn is spliced. When the defect in the clearer 33 is detected and the yarn is cut, the splicer 34 performs the yarn splicing.
Furthermore, the number of times of thread cutting is also counted. Further, the rotation speed of the drive device 36 is also controlled.

A rotation speed sensor 38 is attached to the drive shaft 35a of the winding drum 35. Revolution sensor 38
Is composed of a proximity sensor or the like that detects the approach of the magnet 38a provided on one side of the rotating shaft, and one magnet 38a is attached to the winding drum 35, so Outputs one detection pulse for each rotation. The output of the rotation speed sensor 38 is directly input to the fixed length control device 42 and is used to calculate the winding yarn length. The rotation speed sensor 38 and the magnet 38a are the detection pulse generator 50 and the first reference pulse generator 5 according to the present invention.
1 and 1. The output of the rotation speed sensor 38 is input to the second reference pulse generator 39 according to the present invention. The output of the second reference pulse generator 39 is the clearer 3
It has been entered in 3.

The second reference pulse generator 39 is a circuit composed of a gate array. As shown in FIG. 1, the second reference pulse generator 39 mainly includes the period measuring circuit 1, the equally divided pulse generating circuit 2, and the pulse selecting circuit 3. Composed of blocks. Reference numeral 4 is a universal clock circuit that supplies a pulse of a desired frequency to each circuit. The second reference pulse generator 39 is configured to receive the rotation speed sensor 38 as an input and output it to the clearer 33. The input from the rotation speed sensor 38 is
It is a detection pulse that changes in the range of DC to 86 Hz.

The cycle measuring circuit 1 counts the 2 KHz clock from the universal clock circuit 4 and is reset by the detection pulse (trailing edge), and the timing generation for generating a latch trigger in response to the detection pulse (leading edge). It is composed of a circuit 6, a latch circuit 7 that latches the count value of the counter 5 by this latch trigger, and a DA converter 8 that converts the latched data of the latch circuit 7 into an analog value.

The equal-divided-pulse generating circuit 2 comprises an inverting amplifier 9 for inverting the analog output of the DA converter 8 and a VF converter 10 for oscillating at a frequency proportional to the inverted voltage to generate equal-divided pulses. There is. The inverting amplifier 9 has an offset circuit 11.

The pulse selection circuit 3 counts the detection pulses and 500 msec from the universal clock circuit 4.
A counter 12 that is reset by a timing pulse (trailing edge) of an interval, a timing generation circuit 13 that generates a latch trigger according to the same timing pulse (leading edge), and a latch circuit 14 that latches the count value of the counter 12 by this latch trigger. And a setting device 15 that can set any value
And a comparator 16 that compares the set value with the latch data of the latch circuit 14 and outputs "H" when the latch data is small, and a selector 17 that outputs a reference pulse to the clearer 33. There is.

The selection unit 17 receives 10 msec from the universal clock circuit 4 according to the output state of the comparator 16.
The pseudo pulse of the interval or the equally divided pulse from the VF converter 10 is selected and output, and is configured by the combination of the following gates. That is, the first negative logic NOR
The gate 18 always outputs "H" when the output of the comparator 16 is "L", and outputs a pseudo pulse of the universal clock circuit 4 when the output of the comparator 16 is "H". The second negative logic NOR gate 19 always outputs "H" when the output of the first inverter 20 which is the output of the comparator 16 is "L", and the output of the first inverter 20 is "H". ", The VF converter 10 outputs the equally divided pulses. The NAND gate 21 inverts the other input when one input is “H” and outputs it to the second inverter 22.

Next, the operation of the embodiment will be described.

The operation when the winding speed is high will be described. Here, whether the winding speed is fast or slow depends on the set value of the setter 15, which will be described later.

The frequency of the detection pulse from the rotation speed sensor 38 changes in proportion to the winding speed. For example, the winding speed is 42.9 Hz when the winding speed is 700 m / min, and the cycle is 23 msec. At this time, the counter 5
Counts a 2 KHz clock, so 47 is counted within one cycle of the detection pulse. By the latch trigger and reset based on the detection pulse, the latch circuit 14
This 47 is latched as a measured value of the cycle of the detection pulse. Of course, if the detection pulse changes, this value also changes. The analog output voltage of the DA converter 8 is proportional to this value. The VF converter 10 oscillates at a frequency proportional to the voltage inverted by the inverting amplifier 9 to generate equal pulses. Here, the conversion ratio of the VF converter 10 is set so as to divide the cycle of the detection pulse into 60 equal parts. Therefore, at this winding speed, the equal pulse is 2.6 KHz.

[0030]

[Table 1]

Table 1 shows the frequency and period of the detection pulse, and the second reference pulse generator 39, corresponding to the winding speed.
The count number and the frequency and period of the equally divided pulse obtained in (1) are shown. The frequency of the equally divided pulse in each column is proportional to the winding speed and has a frequency 60 times that of the detection pulse. By outputting the equally divided pulse corresponding to the winding speed to the clearer 33 as a reference pulse, the clearer 33 can evaluate the yarn with a constant yarn length even if the winding speed changes. Moreover, high resolution is guaranteed.

Next, the operation when the winding speed is slow will be described.

When the winding speed becomes slow, the cycle of the detection pulse becomes long, and the cycle measurement or the voltage of the cycle measuring circuit 1 is saturated, so that proper equal pulses cannot be obtained.
Therefore, in this embodiment, the pulse selection circuit 3 measures the frequency of the detection pulse and clears the equally divided pulse only when the frequency is higher than a predetermined frequency, that is, when the winding speed is fast and the equally divided pulse is appropriate. To output to. When the winding speed is slow, the halving pulse is not used and instead a fixed period pseudo-pulse is used for the second reference pulse.

In the pulse selection circuit 3, the counter 1
The detection pulses are counted in 2 and are latched and reset at every timing pulse at 500 msec intervals, so that the latch circuit 14 latches the number of detection pulses included within 500 msec, that is, the measured value of the frequency of the detection pulses. Become. A set value is set in the setter 15 to distinguish whether the winding speed is fast or slow, and the set value corresponds to a winding speed slower than the winding speed shown in Table 1. . Also, the interval of the pseudo pulse is set to be suitable for the slow winding speed. When the measured value of the frequency of the detection pulse is smaller than the set value, the output of the comparator 16 becomes "H", and therefore the input of the equally divided pulse of the NAND gate 21 in the selection section 17 becomes "H" and 10 msec.
Pass the pseudo pulse of the interval. On the contrary, when the measured value is large, the output of the comparator 16 becomes "L", so that the NAN
The pseudo pulse side input of the D gate 21 becomes "H", and the equally divided pulse is passed. By the above operation, the equal pulse is output to the clearer only when the winding speed is fast and the equal pulse is appropriate, and the equal pulse is cut off when the winding speed is slow,
Instead, a fixed period pseudo-pulse is used for the reference pulse.

Since the cycle measuring circuit 1 counts the number of clocks within one cycle of the detection pulse, the number of digits may be small if the cycle of the detection pulse is short. On the other hand, since the pulse selection circuit 3 counts the number of detection pulses within one cycle of the timing pulse, the number of digits may be small if the frequency of the detection pulse is low. Therefore, both the cycle measuring circuit 1 and the pulse selecting circuit 3 can be configured by a circuit having a small number of digits. Since the cycle is measured at high speed and the frequency is measured at low speed, the circuit is simplified.

[0036]

The present invention exhibits the following excellent effects.

(1) Since the sequencer is not used, a cheap sequencer is sufficient. Further, since an expensive impeller is not required and only the electronic circuit is used, the cost can be reduced.

(2) Since it is not necessary to attach the impeller to the winding drum, it is easy to replace the high-resolution clearer on the existing automatic winder.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a second reference pulse generation section showing an embodiment of the present invention.

FIG. 2 is a side view of the automatic winder.

FIG. 3 is a schematic configuration diagram showing a configuration of a winding unit.

[Explanation of symbols]

 35 Winding drum 38 Rotation speed sensor 39 Second reference pulse generator 50 Detection pulse generator 51 First reference pulse generator

Claims (1)

[Claims] 1. A reference pulse generator for generating a first reference pulse corresponding to a winding speed and a second reference pulse corresponding to a multiple of the winding speed, one for each rotation of the winding drum. A detection pulse generation unit that generates a detection pulse, a first reference pulse generation unit that outputs the detection pulse from this detection pulse generation unit as a first reference pulse, and a pulse that is equally divided by dividing the cycle of the detection pulse. And a second reference pulse generator that produces a second reference pulse and outputs the second reference pulse.