JPH083424Y2 - Yarn defect detector - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a yarn defect detecting device for a winding machine such as an automatic winder.

[0002]

2. Description of the Related Art An automatic winder is provided with a device for detecting and removing a yarn defect contained in a yarn drawn from a spinning bobbin and wound into a predetermined shape and a yarn length, which is called a so-called yarn clearer. ing.

The thread defects include nep, slab, thick thread portion, thin thread portion, etc. The nep is generally several ten times thicker than the average thread thickness and the length is several mm, and the slab is the average thread thickness. It is several times thicker and has a length of several cm to several tens of cm.

Such a yarn defect is caused by generating an electric signal according to the thickness of the traveling yarn when passing through the measuring head, that is, the photoelectric slab catcher or the capacitance type slab catcher during traveling. By comparing the signal level with the set level, it is detected as a yarn defect.

In such a yarn clearer, the yarn speed changes between zero and the normal traveling speed when the yarn speed of the traveling yarn is slow, for example, when the winding package driving motor is turned on or off. In such a case, a yarn defect that does not need to be detected may be detected, and unnecessary yarn cutting and yarn splicing operations may be performed.

Therefore, in order to avoid the above-mentioned inconvenience, for example, when the drum drive motor is turned off by the full winding signal, the full winding signal is used as a block signal of the yarn clearer, and the yarn during inertial rotation of the drum is monitored. It is being done not to.

[0007]

Therefore, the yarn defect is not detected during the inertial rotation or during the change of the yarn speed such as the start-up time of the rotation, and the yarn is wound into the winding package. It causes quality deterioration.

An object of the present invention is to solve the above problems.

[0009]

[Means for Solving the Problem] The present invention is directed to a plurality of wines.
In an automatic winder with a
The winding unit is pulled out from the spinning bobbin.
Yarn defect detecting device for detecting the defect of wound yarn and winding package
Drive motor for rotating the traverse drum, and
Input the signal corresponding to the yarn defect emitted from the point detection device
A thread cutting cutter drive device, drum drive motor, etc.
It is equipped with a controller to control each winding unit.
Set a reference value corresponding to the yarn defect length on the
A central controller that controls the
An electric signal corresponding to the yarn speed is generated in the sewing unit.
And the length of the yarn defect based on the electric signal.
Correction means for correcting the above reference value, and the corrected reference value
And the actual detection signal to determine the yarn defect
And the detection signal is corrected to the reference value or corrected.
If it is compared with the standard value and deviates from the standard value, there is a yarn defect.
Presence is detected, and the cutter drive device is driven to cut the yarn.
It is something that is done. "

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 shows a schematic structure of a winding unit in an automatic winder. That is, the yarn (Y) drawn out from the spinning bobbin (1) passes through a tension device and a waxing device (not shown), and a yarn defect detector (2) such as a slab catcher checks the yarn defect portion while checking the traverse drum. It is wound into a rotating package (4) by (3).

During winding, the variation in the thickness of the yarn passing through the slab catcher (2) is constantly input to the clearer controller (5) as an electric signal (6) and compared with a reference value described later to determine a predetermined value. If the value deviates from the reference value by the comparison method, it is considered that the yarn defect has passed, and the controller (5) immediately outputs the operation signal (8) to the cutter driving device (7), and the cutter is operated to perform the yarn cutting. . Along with the yarn cutting, the yarn traveling signal emitted from the slab catcher (2) is turned off, the yarn break is detected, and the controller (5) outputs the drum drive motor (9).
Stop command (10) is output, the contact (11) is opened, the motor (9) is turned off, and the traverse drum (3) is stopped after inertial rotation.

Subsequently, a yarn splicing operation command signal (13) is output from the yarn splicing device (12), and yarn splicing is performed by a known means. At this time, the yarn defect portion is sucked and removed by a suction mouth for guiding the yarn end.

2 (14) is a traverse drum (3).
Of the electric signal corresponding to the yarn speed by detecting the rotation of the
A pulse generator which is a means for generating, for example, a magnet (15) on the end face of the drum, a proximity sensor (16), etc., and a constant length mechanism (which calculates the length of the wound yarn from the rotation speed of the drum (3) ( The pulse signal (18) is input to 17). In the present invention, the pulse signal (18) is also used to calculate the yarn speed during winding.

The yarn clearer controller (5) having the correction means and the discrimination means has a circuit configuration as shown in FIG. 3, for example.

Although there are various states of the yarn defect described above, the detection range mainly depends on the yarn speed. As shown in FIG. 3, the outer diameter (D1) is large and the length (L1) is large. ) Is somewhat large (A), or the outer diameter (D2) is smaller than the outer diameter (D1) of the above-mentioned defect (A), but the length (L2) is large (B).

For example, if the yarn defect (A) has passed through the slab catcher (2), the thickness (D) of the yarn defect (A).
The electric signal (voltage) corresponding to 1) is input to the comparison circuit (20) and compared with the reference voltage (V11) corresponding to the allowable thickness. If it is larger than the reference voltage (V11), the rectangular wave signal ( 21) is output, the rectangular wave (21) is output for a length (L1) that the defect (A) passes through, that is, a time corresponding to the length (L1), and the length is increased by the integration circuit (22). (L1) electrical signal (voltage) corresponding to the judgment means
It is input to a certain comparator (23) and compared with a preset reference value (V12). If the reference value is deviated, the presence of a yarn defect (A) is detected, and immediately the cutter drive circuit (2) is detected.
4) is driven and thread cutting is performed.

Similarly for the yarn defect (B), the thickness (D
The electric signal corresponding to 2) is input to the comparison circuit (25) and compared with the reference voltage (V21). When the electric signal is out of the reference value, a rectangular signal (26) is output and the length ( For a time corresponding to L2), the electric signal integrated by the integrating circuit (27) is input to a comparator (28) which is a judging means and compared with a preset reference value (V22),
When the value deviates from the reference value, the presence of the yarn defect (B) is detected, and the cutter drive circuit (24) is driven.

When the yarn speed is constant, the length of the yarn (L1)
Since the time for passing through the slab catcher (2) is constant, there is no problem if the reference value (V12) is set constant. For example, if the yarn speed is 1000 m / min, that is, 16.7 m / sec, the time required for a defect of L1 = 1 cm to pass is 0.6 ms, and the reference value (() is calculated based on the integral of the rectangular wave (21) corresponding to the time. All you have to do is set V12).

However, if the yarn speed changes, the passing time also changes, and if the yarn speed reaches 2000 m / min, the same defect (A) as described above takes 0.3 ms to pass.
It becomes smaller than the reference value (V12) set based on 6 ms, and the above-mentioned defects may not be detected.

In the present invention, the length (L1) or (L
The reference values (V12) and (V22) for 2) are changed following the change in yarn speed, and the relative length (re
ference length) is made constant.

In FIG. 1, the pulse signal (18) generated by the rotation of the drum (3) passes through an isolator (30) to remove noise, and then a digital-analog converter (31).
Is input to the clearer controller (5).

In the clearer controller (5), the reference value (V12) set by the central controller (32) for setting the reference length for all the winding units is corrected by the analog voltage to obtain the reference value (V12). ) Is said.

For example, in FIG. 4, the yarn speed is a diagram (F).
(F1) (F that changes depending on the winding time (t)
3) In (F4), the reference voltage of the reference length is changed in proportion to the yarn speed as shown by the line (G). Therefore, the part where the yarn speed changes (F1) is the rise time of the drum at the beginning of rewinding from one spinning bobbin, and the part where the yarn speed changes (F3) when rewinding one bobbin, the bobbin thread layer As the yarn release resistance increases with decreasing, the yarn speed changes (decreases) when the winding yarn speed of the package is slightly reduced. In the case of a full-winding package, the drum coasts despite the drum motor stopping, and the yarn is wound during this period, but this is the yarn speed change portion (F4).

The changed portions (F3) and (F4) are schematically shown for the sake of explanation, and actually, the changed portions (F3)
3) Since (F4) does not continue and there is no yarn following the changing part (F3), the yarn speed immediately becomes zero, and when the full winding signal appears at the normal winding yarn speed, the constant speed portion The changed portion (F4) immediately appears from (F2), that is, coasting is performed.

In any case, the reference value for comparison is changed as the yarn speed changes, and the absolute value of the yarn defect length (L1) that occurs at each yarn speed does not change. The relative length to speed is constant.

The yarn defect (B) in FIG. 3 has a thickness D2,
In the case where the length is L2, the reference voltage (V22) corresponding to the defect length (L2) is naturally corrected by the analog voltage corresponding to the yarn speed in accordance with the change in the yarn speed as described above.

To further explain the above description in detail, as shown in FIG. 5, when the detected voltage value for the defect of the length (L1) changes as shown by the line (H) as the yarn speed increases. The set reference value supplied from the central controller (32) to each winding unit is also corrected as shown by the line (I), and the difference (S) between the detected value (H) and the reference value (I) at each yarn speed (S). Is to control so that is constant.

Although FIG. 5 shows the case where the detected voltage value decreases as the yarn speed increases, when the electric signal is processed so that the voltage value increases as the yarn speed increases,
Similarly, the reference value is also corrected so as to increase.

[0030]

As described above, according to the present invention, the set reference for comparing with the detected value of the yarn defect length corresponding to the change of the yarn speed is corrected to correspond to any yarn speed and the yarn defect is corrected. Since the judgment is made, the reference value and the detected value according to the yarn speed are detected even at the start of winding, during inertial rotation when the full winding signal is generated, and when the yarn speed changes during other winding. Since the yarn defect length can be reliably detected, unnecessary yarn cutting is not performed, and the clearer function does not need to be blocked during inertial rotation, the winding starts from the beginning. The yarn defect can be detected during all the yarn running, and a good quality package can be obtained. Also, each
The standard value of the winding unit is Central Control
Can be set collectively by the
The correction of the standard value for each knit is applied to each winding unit.
Since it is performed by the controller provided, it is possible to
In an automatic winder composed of a winding unit
Defect detection can be done by checking the yarn speed for each winding unit.
Even if there is a change, it can be done accurately.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the device of the present invention.

FIG. 2 is a schematic diagram showing a configuration of a winding unit.

FIG. 3 is a diagram showing an example of a type of yarn defect and a circuit for detecting the defect.

FIG. 4 is a diagram showing the relationship between yarn speed and reference voltage.

FIG. 5 is a diagram showing a relationship between a detected value and a reference value.

[Explanation of symbols]

 2 Thread defect detector 5 Clearer controller 18 Pulse signal 31 Digital-to-analog converter V Reference voltage F Thread speed diagram H Detected value I Reference value S Difference between detected value (H) and reference value (I) at each yarn speed

Claims (1)

[Scope of utility model registration request] 1. A plurality of winding units are provided.
For each winding unit in the automatic winder
Is a yarn that detects defects in yarn drawn from a spinning bobbin.
Defect detection device and traverse drive that rotates the winding package
From the yarn drive motor and the yarn defect detection device
Drives a cutter for thread cutting by inputting a signal corresponding to the thread defect
A controller that controls the device, drum drive motor, etc.
It is equipped with a thread deficiency in the controller of each winding unit.
Central control to set reference value corresponding to point length
And the winding speed is set in each winding unit.
Means for generating an electric signal corresponding to
Compensation for correcting the above reference value corresponding to the yarn defect length based on
Comparing the correct reference value with the corrected reference value and the actual detection signal
And a detection means for determining a yarn defect,
Is compared with the above reference value or corrected reference value, and the reference value
If there is a yarn defect, the presence of a yarn defect is detected and the cutter
-A yarn defect detecting device characterized in that a drive device is driven to cut the yarn.