JP2774247B2 - Method for detecting the processing position of bobbin wrapped yarn - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting the cutting position of a lap wound yarn formed when a transfer tail is formed at the end of a bobbin (paper tube), and particularly to a bobbin for a synthetic fiber yarn package such as polyamide and polyester. The present invention relates to a method for detecting a specific position for cutting a lap wound yarn at an end.

[0002]

2. Description of the Related Art When a synthetic fiber yarn such as polyester or polyamide fiber is processed by a draw twisting machine or a draw false twisting machine, the yarn end at the beginning of winding and the yarn end at the end of winding between the original bobbins are considered. And the continuous processing is performed. Therefore, a so-called transfer tail is formed at the end of the bobbin outside the traverse area at the start of winding.

[0003] In the yarn package wound in this manner, a bunch winding portion formed at the end of the bobbin is peeled off leaving a transfer tail of a fixed length so that transfer tail processing can be easily performed. At the start of the subsequent yarn winding, the transfer tail portion formed between the bunch winding portion and the yarn package is fixed to the bobbin end with a tape, a label, a seal (paper) or the like.

[0004]

Heretofore, such a bunch winding process has been performed manually. However, in recent years, mechanization and automation have been attempted, and a method of attaching a tail tape to a tail winding portion and removing by suction has been proposed. However, since the thread has entered the slit provided on the bobbin,
The yarn in this portion is difficult to remove, has problems such as breakage and remains, and has the disadvantage of damaging the bobbin. For this reason, there has been a problem that the product cannot be reused because the product quality is not sufficient.

[0005] In order to solve this problem, a bunch winding thread at a position where a slit groove at the end of a bobbin is not cut is cut, and one end of the cut thread is sucked and held. While rotating the gripper in the direction that burns the strip,
A method for removing the yarn has been proposed. There has also been proposed a method of measuring a yarn position using a binarized image and detecting a position obtained by adding a predetermined margin to a true value of the yarn position as a yarn cutting position.

By the way, when introducing this method, a position where a slit groove is not formed at the end of the bobbin is detected, and
It is necessary to perform positioning. As a method for detecting a slit position for gripping a winding start yarn, in a method proposed so far, a light source such as a halogen lamp is applied to the overlapping winding portion, and the width of the overlapping winding yarn for one round of the bobbin is illuminated by a solid-state camera. In addition, there is a problem that it takes a long time to detect the thread, and cannot be detected unless the lap wound yarn at the end of the bobbin sufficiently enters the slit.

As a method for detecting the slit position,
Using a first distance sensor for detecting the slit on the bobbin surface and a second distance sensor for detecting the reference plane of the inner part of the slit, the two packages are rotated while the yarn package is rotated by a motor provided with a rotation angle detector. Detect level difference,
There has been proposed a method of calculating a rotation angle from a rotation amount corresponding to the level difference, detecting a slit position, and determining a slit position. However, in this method, two sensors are required for detection, and the depth of the slit cannot be recognized depending on the amount of the overlapping wound yarn wound on the bobbin,
There has been a problem that reflected light from an optical sensor used as a distance sensor is irregularly reflected on a yarn and is erroneously detected.

[0008] The present invention solves the above-mentioned problems, and reduces the processing surface or a specific position of a bobbin having a dent or the like having a slit for catching a yarn, such as a lap winding yarn cutting, by one.
It is an object of the present invention to quickly and surely determine the number of lap-wound yarns by using individual sensors, mechanically process a yarn package or the like without manual operation, and automate a bobbin processing process.

[0009]

SUMMARY OF THE INVENTION According to the method of detecting the processing position of a bobbin wrapped yarn, the yarn is captured by a slit formed at the end of the bobbin, and then a transfer tail is formed and wound. When processing a wrapped yarn at the end of a bobbin in a wrapped package, a rotation angle detector is provided by using a bobbin provided with a recess at an end surface position that is separated from the slit position by a predetermined distance and is not hidden by the wrapped yarn. By rotating the yarn package by rotating means having
By measuring the distance between the distance detecting means and the hobbin end face by the distance detecting means arranged at a position facing the bobbin end face provided with the dent, the bobbin end face provided with the dent is scanned, and the obtained distance signal is After performing filter processing based on signal frequency components, only signals whose distance level is equal to or greater than a predetermined threshold are extracted, and the portion where the distance level is continuously equal to or greater than the threshold is regarded as a block, and the signal waveform of each block is Is calculated, the rotation angle corresponding to the position of the block having the largest area is determined as the position of the depression, and the processing position of the yarn is determined based on the position of the depression.

[0010]

FIG. 1 shows an apparatus for detecting a processing position of a bobbin wrapped yarn according to an embodiment of the present invention. In the figure, P is a yarn package, B is a bobbin, S is a slit on the end surface of the bobbin B, and H is a position provided at a fixed distance from the end of the slit S to the side without the slit S at the end surface ridge of the bobbin B. It is a hollow.

Reference numeral 1 in the drawing denotes a tray for conveying a yarn package. The tray 1 includes a substrate 2, a support column 3 having a channel-shaped cross-section protruding upright on the substrate 2, a pedestal 4 attached to the support column 3, and a yarn package holder disposed via the pedestal 4. 5 and the like.

Further, the holder 5 of the yarn package has a bobbin holder 6 rotatably held by a bearing fixed to the pedestal 4. The bobbin holder 6 is provided with a chuck claw supported so as to be able to enter and exit by expansion and contraction of a spring or the like, so as to grip the thread package P from the inner surface.

[0013] At the rear end of the retainer 5, a drive connecting portion formed of a conical hollow body is formed. This is connected to a conical drive transmission member provided at the distal end of the drive motor 7, which will be described later, and is driven. The transmission of the driving force is not limited, and a spline system or other connecting means can be used.

First, a yarn package (in this example, cheese) P
Is a bobbin holder 6 by a transfer device (not shown).
And is transported while being held. Then, the tray 1 for transferring the package P is positioned and stopped by a stopper provided at a predetermined position.

At this stop position, a step motor 7 as driving means for the package P is provided. When the tray 1 stops, the base 8 supporting the motor 7
The motor 7 is advanced by a hydraulic cylinder as a forward / backward moving means, and a drive transmission body provided at a front end of the motor 7 is connected to the holder 5 of the tray 1. Thereby, the package P held by the bobbin holder 6 becomes rotatable.

A rotary angle detector (rotary encoder) 9 is provided at the front of the step motor 7. This rotation angle detector is configured to include a gear-shaped rotating disk with a notch on the outer periphery and a light-emitting body that shines light on the disk (a magnetic or other method may be used).

At a position facing the end of the bobbin B, a distance sensor 10 is fixed at a corresponding position for detecting a depression H provided at the end of the bobbin B. The distance sensor 10 is supported via a bracket 11.

When a command is given from the operation sequencer 12 to the motor driver 13, the step motor 7
Drives the package P to rotate (usually one rotation). While the rotation amount at that time is measured by the rotation angle detector 9, the depression H is provided on the end face at a position separated from the end of the slit S on the end face of the bobbin B by a distance from the end of the slit S to the non-slit part by the distance sensor 10. The distance is measured by rotating and scanning the position.

The signal waveform obtained from the sensor 10 includes a constant bias corresponding to the distance from the sensor 10 to the end face of the bobbin B, a surface irregularity signal of the end face of the bobbin B, a low-frequency bias generated by eccentricity during rotation. High frequency noise is included. In order to accurately detect the depression H from this signal,
By passing the signal corresponding to the angle through a band-pass filter, it is possible to extract a signal waveform having only the surface unevenness of the bobbin end face.

Further, for this signal waveform, the average value L of the signal
P is calculated, and only the signal having the average value LP or more is extracted, and the signal having the average value LP is set to 0. An average value AV of the area of the signal portion is calculated for the signal waveform thus obtained. Then, a predetermined ratio of the average value AV (20
0%) is set as the threshold value TH, and only signals that are equal to or greater than the threshold value TH are extracted, and signals less than the threshold value TH are set to 0. As a result, only a few large portions of the signal can be extracted as a peak of such a number of blocks. That is,
A signal waveform as shown in FIG. 2 is obtained. In FIG. 2, the horizontal axis represents the rotation angle of the package P, and the vertical axis represents the level of the distance signal. FIG. 2 shows a raw signal waveform before processing (lower part in the figure) and a signal waveform after threshold processing (central part in the figure).

The area of each lump portion of the signal waveform obtained in this manner is calculated, and the peak having the maximum area is determined as the depression H. Then, the center of the mountain is determined as the depression H position (rotation angle).

Thereafter, the predetermined angle calculated based on the positional relationship between the slit position and the depression position so that the predetermined bobbin surface to be processed next, for example, the upper bobbin surface has no slit. Only the motor rotates and stops. The upper surface of the end of the bobbin is the next process, which is the surface where the slit is not formed, for example, the cutting position of the overlapped yarn.

[0023]

As described above, according to the present invention, a processing surface or a specific position for cutting a bobbin having a depression or the like having a dent formed with a slit for catching a yarn, such as overlapping winding yarn, is reduced by one. The sensor can quickly and reliably determine the amount of wrapped yarn regardless of the amount of yarn, making it possible to mechanically process yarn packages and the like without manual operation, which is extremely important in automating the bobbin processing process. Has a remarkable effect.

[Brief description of the drawings]

FIG. 1 is an apparatus for detecting the processing position of a bobbin superimposed yarn

FIG. 2 is a signal waveform obtained from a distance sensor.

[Explanation of symbols]

 P Thread package B Bobbin S Slit H Depression 1 Tray 6 Bobbin holder 7 Step motor 9 Rotation angle detector 10 Distance sensor 12 Operation sequencer

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-78013 (JP, A) JP-A-5-270734 (JP, A) JP-A-5-278940 (JP, A) JP-A 64-64 14337 (JP, A) Japanese Utility Model 5-3270 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) B65H 54/00-54/34 B65H 67/08

Claims (1)

(57) [Claims] After a yarn is captured by a slit engraved at an end of a bobbin, a transfer tail is formed to process a wrapped yarn at the bobbin end in a wound yarn package. A bobbin provided with a dent at a predetermined distance and provided with a dent at an end face position which is not hidden by the overlapping wound yarn, and the yarn package is rotated by a rotation means provided with a rotation angle detector to provide a dent. By measuring the distance between the distance detecting means and the hobbin end face by the distance detecting means arranged at the position facing the end face, the bobbin end face provided with the depression is scanned, and the obtained distance signal is determined by the signal frequency component. After performing the filter processing, only signals whose distance level is equal to or more than a predetermined threshold are extracted, and a portion where the distance level is continuously equal to or more than the threshold is collectively blocked. Calculate the area of the signal waveform for each block, judge the rotation angle corresponding to the position of the block with the largest area as the position of the depression, and determine the processing position of the yarn based on the position of the depression. A method for detecting a processing position of a bobbin wrapped yarn.