JP2000327225A - Traverse abnormality detecting device for winder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To certainly detect traverse abnormality by detecting, as a vibration component, tension variation based on a traverse of a thread, restricting the vibration component to a component existing in a prescribed threshold when there is no traverse of the thread, and determining traverse abnormality based on the restricted component. SOLUTION: This traverse abnormality detecting device 30 is provided with a sensor 31 as a detecting means that is provided near a traverse furculum and outputs variation of a tension value responsive to the right and left traverses. Of output signals of this sensor 31, a peak of a vibration waveform deflected up or down in a one-traverse state where the traverse is deflected right or left is cut by a limiter circuit 32 based on upper and lower thresholds. Thus, amplitude difference of waveform between during normal time and during one-traverse time is cleared. The difference between the both is classified by a discriminating means 33 comprising an alternating current component extracting circuit 34, a full wave rectifying circuit 37, a smoothing circuit 38, and a comparing circuit 36, and a traverse abnormality is discriminated and outputted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traverse abnormality detecting device for a winder, and more particularly to a device capable of distinguishing between a normal traverse state and a traverse state deviated right or left.

[0002]

2. Description of the Related Art Textile machines for handling yarns are equipped with a winding machine for winding unwound yarns, processed yarns, or supplied yarns into packages. This winder is provided with a yarn traverse mechanism for traversing the yarn heading for the package rolling on the drum.

However, if the yarn has a weak part,
When the portion reaches the contact portion between the package and the drum, the portion may be worn away, and the cut yarn may wind around the drum.
When such a traverse abnormality occurs, the yarn is traversed, but the yarn is wound not on the package side but on the drum, and the yarn wound on the drum becomes thicker, causing serious trouble such as mechanical damage. Cause cause.

Therefore, a piezoelectric element is provided in the vicinity of the traverse support point P to detect the impact force of the yarn at the time of folding, and to detect an abnormal change in the tension fluctuation before and after the yarn is cut and wound on the drum, and the yarn is moved to the drum. A device that detects a traverse abnormality such that the traverse of the traverse occurs.

[0005]

However, among the traverse abnormalities, there is a traverse abnormality in a one-sided state in which the traverse proceeds in a state where the traverse proceeds to one of the right and left sides of the drum, although the yarn does not break. In this case, a large tension fluctuation such as that at the time of thread breakage does not occur, and a tension fluctuation accompanying traversing also normally occurs. For this reason, there is a problem that even if a piezoelectric element is provided near the traverse fulcrum P to monitor the tension variation due to the traverse, it cannot be detected as a traverse abnormality.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and has as its object to provide a traverse abnormality of a winding machine capable of reliably detecting a traverse abnormality including a skewed state deviated rightward or leftward. A detection device is provided.

[0007]

According to a first aspect of the present invention, there is provided a detecting means for detecting a fluctuation in tension based on a traverse of a yarn as a vibration component, and detecting the vibration component in a case where there is no traverse of the yarn. A traverse abnormality detecting device for a winder, comprising: limiting means for limiting components present within a predetermined threshold value set above and below an output; and determining means for determining traverse abnormality based on the limited components. It is.

It has been found that, when a traverse abnormality occurs in the oscillating state, vibration similar to tension fluctuation in a normal case occurs, but the center of the vibration shifts to a higher or lower side. Therefore, according to the first aspect of the present invention, the vibration component is limited to a component within a predetermined upper and lower threshold value of the output when there is no yarn traversal. The vibration component is greatly limited by the shift of the center of the traverse, and an output state in which the traverse in the one-sided state and the traverse in the normal state can be clearly distinguished is obtained.

According to a second aspect of the present invention, the determining means includes:
Extraction means for extracting an AC component from the restricted component, rectification means for rectifying and smoothing and outputting the AC component, and comparing the output of the rectification means with a predetermined reference value to determine a traverse abnormality. The traverse abnormality detecting device for a winder according to claim 1, further comprising:

According to the second aspect of the present invention, since an AC component is extracted and then rectified and smoothed, a certain output is secured even in an average value, and a normal traverse and no traverse state can be distinguished. Can be.

According to a third aspect of the present invention, the detecting means includes:
The traverse abnormality detecting device for a winder according to claim 2, further comprising a detector that sandwiches the yarn from both sides in the traverse direction.

According to the third aspect of the invention, since the detecting means outputs the left and right traverses as vibration components, the vibration components do not disappear even when the traverse is deviated to the left or right, so that it is detected as a traverse abnormality. it can.

[0013]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an equipment block diagram of the traverse abnormality detecting device of the present invention. FIG. 2 is a diagram showing output waveforms from each block.

In FIG. 1, a traverse abnormality detecting device 3
0 comprises a sensor 31 as a detecting means, a limiter circuit 32 as a limiting means, and a determining means 33. The determination unit 33 includes an AC component extraction circuit 34, a rectification unit 35, and a comparison circuit 36 as a comparison unit. The rectifier 35 includes a full-wave rectifier circuit 37 and a smoothing circuit 3.
8 is provided.

The sensor 31, which is a detecting means, is provided near the traverse fulcrum P and can use either a strain gauge or a piezoelectric element as long as it can output a change in the tension value according to the right and left traverse. May be used.

As shown in FIG. 2A, the output a of the sensor 31 has a waveform that oscillates up and down around a level of, for example, 2 volts. Here, the 2 volts is the output g when there is no traverse of the yarn. In the normal traverse state shown on the left side of FIG. 3A, a substantially uniform vibration waveform a in the upper and lower directions of the output g is generated. In the single traverse state in which the traverse is deviated to the left or right side as shown on the right side of FIG. 10A, a waveform a ′ is generated in which the output g is deviated either up or down. In the illustrated example, the waveform a 'is located above the output g.

The limiter circuit 32, which is a limiting means, cuts the upper and lower peaks of the vibration waveform at the upper and lower thresholds (± h) set around the output g when there is no traverse of the yarn. Sensor 3 by traversing yarn
The peak value of the output of No. 1 changes due to winding thickening even in a normal traverse state. Therefore, it is preferable to set the threshold value (± h) to the smallest output peak value in a normal traverse state.

In the normal traverse state on the left side of FIG. 2B, a waveform b is obtained in which the upper and lower peaks of the vibration component are slightly cut. In the single traverse state in which the traverse on the right side of FIG. 3B is deviated to the left or right side, the waveform b ′ has a waveform in which the upper peak of the vibration component is largely cut. For this reason, when looking at the vibration components, in FIG. 10A, the only difference is that the vibration components are shifted up and down. In FIG. 10B, however, the shapes of the vibration components themselves are greatly different. It can be seen that the difference between the two can be easily determined. That is, the limiter circuit 32 is used to make the difference between the amplitudes of the waveform between the normal state and the single traverse remarkable.

An AC component extraction circuit 34, a full-wave rectification circuit 37,
It is preferable to include a smoothing circuit 38 and a comparison circuit 36.

The AC component extraction circuit 34 extracts the amount of change in the force applied to the sensor 31 during traversing (how much force is applied to the right and left), and extracts the vibration component in the upshifted state. It is extracted as an AC component that vibrates above and below the reference (GND). FIG.
(C) In the normal traverse state on the left side, the waveform c is substantially symmetrical above and below GND. In the single traverse state in which the right traverse is deviated to the left or right side in the same figure (C), a long mountain in the time direction above the reference (GND) and a short mountain in the time direction below the reference (GND) alternately. Is a waveform c 'appearing in FIG.

The full-wave rectifier circuit 37 changes an alternating current component that vibrates above and below the reference (GND) into a waveform that fluctuates above the reference (GND), which is the vertical center of the waveform. In the normal traverse state on the left side of FIG.
The waveform is a regular high mountain waveform d above ND. In the single traverse state in which the right traverse is deviated to the left or right, the long and low mountain in the time direction and the short and low mountain in the time direction are alternately continuous above the reference (GND). The waveform d 'appears.

The smoothing circuit 38 smoothes the waveform from the full-wave rectifier circuit 37. In the normal traverse state on the left side of FIG. 2E, the waveform e is relatively high and smooth. In a single traverse state in which the traverse is deviated to the left or right side as shown on the right side of FIG. 10E, the waveform is relatively low and smooth.

The comparison circuit 36 compares the output waveform e or e 'from the smoothing circuit 38 with a reference value (i), and
, An alarm signal f is output. In the normal traverse state on the left side of FIG. 2E, the relatively large and smooth waveform e exceeds the reference value i, and the alarm signal f is not transmitted. In the single traverse state where the traverse is deviated to the left or right side as shown on the right side of FIG. 10E, the relatively small and smooth waveform e ′ falls below the reference value i, and the alarm signal f is transmitted.

When there is no traverse, the vibration component of the output of the sensor 31 becomes substantially zero, and the output of the smoothing circuit 38 becomes smaller than the reference value i. Can be detected.

Next, a preferred embodiment of the sensor 31 as detecting means provided near the traverse support point P will be described with reference to FIG. The sensor 31 includes a contact 20, an elastic body 21, a measuring plate 23, and a strain gauge 22.

The contact 20 is provided with a U
It has a U-shaped groove. Further, the contact 20 is supported by an elastic body 21 and has a structure including a measurement plate 23 that performs a bending movement by receiving deformation of the elastic body 21 and a strain gauge 22 for measuring the bending. The signal from the controller 22 includes the controller 2 containing the circuit described in FIG.
9 is transmitted.

The contact 20 is slightly above the traverse fulcrum P, and can strongly receive the impact due to the turn of both yarns. Therefore, it is possible to detect a case where the traverse is biased to one of the left and right sides as compared with the one that receives an impact due to the return (turn) of one of the yarns.

The contact 20 has a smooth surface made of a material such as ceramic so that the yarn is not damaged by friction and the yarn guide itself is not worn or has high heat by friction with the yarn.

The elastic body 21 sandwiches the measuring plate 23 at the center,
A circular hole 24 and a long hole 25 are provided at the ends, and pins 26 and 27 are inserted into each of the circular holes 24 and the elongated holes 25 so that the pin 26 can vibrate around the pins 26. The measuring plate 23 moves in the traverse direction of the yarn (FIG. 3).
(Vertical direction in FIG. 3), and is bent while swinging left and right (vertical direction in FIG. 3) by the vibration of the elastic body 21. A strain gauge 22 is attached to the side surface. When the yarn is normally traversed with tension, the yarn collides with the right and left sides (in the direction of the arrow) of the contact 20 at regular intervals, and the elastic body 2
The measuring plate 23 is shaken through the device 1, and the expansion and contraction of the side surface of the measuring plate 23 is converted into an electric signal by the strain gauge 22 and output to the controller 29.

In addition to the strain gauge, a piezoelectric element (not shown) may be used. In that case, a piezoelectric element can be appropriately provided on the root side of the elastic body 21 on which the U-shaped contact 20 is supported so that a compressive stress can be received by the fine movement of the contact 20. Further, as the elastic body, as described above, besides the one that vibrates around the pin 26, one that changes the volume such as rubber, a spring, or the like can be used.

Referring to FIG. 4, the structure and operation of an automatic winder as a preferred example of a winder equipped with the traverse abnormality detecting device 31 will be described below.

The automatic winder 1 has a configuration in which a balloon breaker 3, a tension device 4, a yarn defect detection head 5, and a traverse drum 6 are sequentially arranged along a yarn path from a yarn supplying bobbin 2 to a package 7. A sensor 31 is provided near the traverse support point P. A piecing unit 9, a suction mouth 10, and a relay pipe 11 are on standby beside the yarn path, and automatically perform piecing after removing a yarn defect and piecing after replacing the yarn supplying bobbin 2. It is a configuration that can be used.

The tension device 4 includes an openable gate 4a.
And an appropriate tension is applied to the yarn by the balance with the traverse drum 6. Examples of such a device include an automatic opening / closing type friction-type fluff suppressing device (friction twister) and an automatic opening / closing type tension applying device (gate tensor).

The traverse drum 6 rotates in contact with the package 7, and traverses the yarn by a yarn groove provided on the outer peripheral surface. In the vicinity of the traverse drum 6, end face drop prevention guides 15 and 16 for preventing the end face of the yarn from dropping are provided.

The splicing unit 9 is provided at a position away from the yarn path. The suction mouth 10 and the relay pipe 11 are provided so as to be pivotable about shafts 12 and 13, respectively, and the suction pipe 1 is provided near the yarn path below the cutter 8.
4 are provided. When cutting the yarn by the cutter 8, the yarn end on the bobbin 2 side is held by the suction tube 14, and the shaft 12,
13 and suction mouth 10 and relay pipe 1
1 to prevent the yarn end on the package 7 side from being
The suction mouth 10 is picked up from between the points 5 and 16, the yarn end on the bobbin 2 side is received by the relay pipe 11 from the suction pipe 14, and further turned to return the suction mouth 10 and the relay pipe 11 to their original positions. By passing the yarn ends through the piecing unit 9, piecing is performed. At the same time, the yarn is also passed through the yarn defect detection head 5 and the gate 4a of the tension device 4, and after the yarn splicing is completed, the traverse drum 6 is first reversed, and the seam is dropped to the yarn defect detection head 5, and the yarn at the seam is Check for defects,
After that, the operation returns to the normal operation. Although the yarn splicing unit 9 is provided on the package 7 side of the yarn defect detection head 5, it may be provided on the yarn supplying bobbin 2 side.

The yarn clearer having the yarn defect detection head 5 includes an electrostatic type, an optical type, and the like. The yarn clearer includes a yarn slab, a thick yarn, and a weak yarn by measuring a change in the cross section of the yarn (change in outer diameter). Detects defects such as fine yarn, and yarn breakage. The yarn defect detection head 5 has a built-in cutter 8, and upon detecting a defect contained in the yarn, operates the cutter 8, immediately cuts the yarn, stops the drum, and automatically performs the operation of joining the yarn.

In the automatic winder 1 having the above-described structure and operation, if a yarn is wound around the traverse drum 6 for some reason, the traverse groove of the yarn is closed by the wound yarn. In some cases, a one-sided traverse B is started at one of the left and right sides of the wound portion.

In this case, the controller 29 in which the circuit of FIG. 1 is incorporated determines the traverse abnormality in the one-sided skew state, which is deviated leftward or rightward, from the normal traverse, and outputs the alarm signal f of FIG. Based on this alarm signal f, the cutter 8 of the winding unit 1 is operated to stop winding, and the operator is caused to perform inspection by displaying a lamp or the like.

When the yarn is not inserted into the gate 4a of the tensioning device 4 which is on the yarn supplying bobbin 2 side with respect to the yarn defect detecting head 5 and applies tension to the yarn, there is no yarn tension. There is almost no output, and it can be determined as a traverse abnormality as in the case of no traverse.

The sensor 3 suitable for the automatic winder 1
Although the description has been made mainly on the case where the U-shaped contact 20 is provided in the vicinity of the traverse fulcrum P, the present invention is not limited to this. 6 can be appropriately provided. However, the sensor 31
Is provided in the vicinity of the traverse support point P, the size of the contact 20 can be reduced, a large vibration output can be obtained, and more reliable traverse abnormality detection can be performed. In addition, the sensor may be disassembled into two parts, and a pair of contacts that slightly move by tension of the thread at both turn portions may be provided.

[0041]

According to the first aspect of the present invention, a traverse abnormality can be detected by clearly distinguishing a normal traverse state and a traverse state deviated left and right.

According to the second aspect of the present invention, not only a traverse state deviated left and right but also a no traverse state can be detected separately from a normal traverse state.

According to the third aspect of the present invention, a traverse abnormality can be detected even if the traverse is deviated to the left or right.

[Brief description of the drawings]

FIG. 1 is an equipment block diagram of a traverse abnormality detection device according to the present invention.

FIG. 2 is a diagram showing output waveforms from each block of the traverse abnormality detection device.

FIG. 3 is a top view showing a specific example of a sensor.

FIG. 4 is a diagram illustrating a device configuration of an automatic winder that is an example of a winder equipped with a traverse abnormality detection device.

[Explanation of symbols]

 Reference Signs List 30 traverse abnormality detecting device 31 sensor (detecting means) 32 limiter circuit (limiting means) 33 determining means 34 AC component extracting circuit (extracting means) 35 rectifying means 36 comparing circuit (comparing means) 37 full-wave rectifying circuit 38 smoothing circuit 1 automatic Winder (winding machine) 6 traverse drum 7 package P traverse fulcrum A traverse area

Claims (3)

[Claims] 1. A detecting means for detecting a fluctuation in tension based on a traverse of a yarn as a vibration component, and detecting the vibration component as a component existing within a predetermined threshold set above and below an output when there is no traverse of the yarn. A traverse abnormality detecting device for a winder, comprising: limiting means for restricting; and determining means for determining a traverse abnormality based on the restricted component. 2. The method according to claim 1, wherein the determining unit includes an extracting unit configured to extract an AC component from the limited component, a rectifying unit configured to rectify and smooth the AC component, and output the rectified unit. The traverse abnormality detecting device for a winder according to claim 1, further comprising a comparing unit that compares the value with a value to determine a traverse abnormality. 3. The traverse abnormality detecting device for a winder according to claim 2, wherein said detecting means has a detector for sandwiching the yarn from both sides in the traverse direction.