JP2000016703A - Detecting device for winding of yarn on roller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately detect the winding of a yarn on a roller, by providing an optical sensor having a projector element projecting light on the roller also a light receiving element receiving the light from the projector element, and deciding the winding of the yarn on the roller by a condition of the light received to the light receiving element. SOLUTION: A distance sensor 20 formed by an optical sensor having a train of light projecting/receiving elements 22, 23 is provided in such a manner that an irradiation axis thereof is oblique by a prescribed angle relating to an axis at right angles to the center axis of a friction roller 12. A yarn traverses in a ring-shaped point in a prescribed position of the friction roller 12 by generating a twilled winding in a traverse range when the yarn is accidentally wound on the friction roller 12, light from the irradiation axis is irregularly reflected. This light of irregular reflection, even when it is slightly generated, is detected by the distance sensor 20, an irregular reflection object is detected to be provided in a distance L1 by a decision part 40. In this way, the winding of the yarn on the friction roller 12 can be detected in an early stage.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting a yarn erroneously wound around a roller rotating in contact with a winding package in a yarn winding section, and more particularly to a roller capable of detecting the yarn at an initial stage of winding. And a thread winding detection device.

[0002]

2. Description of the Related Art Textile machines, such as a draw false twisting machine and a spinning take-up machine, wind a yarn subjected to a draw false twisting process or a spinning process onto a bobbin or a paper tube to form a winding package. The take-up package is taken out and replaced with an empty bobbin or a paper tube, and provided with a yarn take-up portion that enables continuous take-up.

The yarn winding section supplies the yarn reciprocated by a traverse device to a winding package rotating in contact with a roller to form a winding package having a predetermined twill winding. It has a configuration. The yarn winding section has a yarn hooking device or a yarn transferring device that cuts a yarn reaching a full winding package and hangs the yarn on an empty bobbin or a paper tube.

[0004]

This thread hooking or thread passing is performed on a bobbin or a paper tube which rotates at a high speed in contact with the roller, and thus may fail. One form of this failure is that the yarn may accidentally wind around the roller. When the yarn is wound around the roller, the traverse device traverses the roller to the roller, and the yarn is fed in steadily. Therefore, a state similar to the case where the traversing is normally performed on the winding package occurs. Therefore, simply monitoring the presence or absence of running yarn
Wrong winding of the thread on the roller cannot be detected. If the winding of the yarn around the roller is left unattended, the yarn of the roller becomes thick and thick, causing serious mechanical damage to the winding portion of the yarn.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and it is possible to accurately detect the winding of a thread around a roller, and furthermore, to detect the initial state of the winding of the thread around a roller. An object of the present invention is to provide a winding detection device for a roller that can be detected in stages.

[0006]

According to the first aspect of the present invention, there is provided a roller rotating in contact with a winding package, a light emitting element for emitting light to the roller, and a light from the light emitting element. A light sensor having a light receiving element receiving the light, and a judging unit for judging winding of the yarn around the roller based on a state of light from the light receiving element received by the light receiving element. It is a detection device.
Since the presence or absence of the yarn is directly detected using the optical sensor, the winding of the yarn can be accurately detected. Further, unlike the mechanical method, since the detection is performed by light, the detection can be performed at a stage where the thread winding amount is small.

According to a second aspect of the present invention, there is provided the roller winding detecting device according to the first aspect, wherein the optical sensor is a reflection type sensor having a detection area limited to a predetermined distance range. Since a reflection type sensor having a limited detection area is used, the presence / absence of a yarn at a predetermined position can be detected with high accuracy, the yarn can be detected only by winding the yarn around the roller once, and the winding of the yarn can be detected at an early stage.

According to a third aspect of the present invention, there is provided the roller thread winding detecting device according to the second aspect, wherein the light of the sensor is visible light. This makes it easier to aim at a predetermined position on the roller surface. The visible light is, for example, red.

According to a fourth aspect of the present invention, in the second aspect, the light irradiation axis of the sensor is inclined at a predetermined angle with respect to an axis perpendicular to the center axis of the roller. Device. This makes the predetermined angle appropriate,
Light reflected from the roller surface is avoided, and irregularly reflected light due to yarn erroneously wound on the roller surface can be selectively and efficiently received.

According to a fifth aspect of the present invention, the sensor includes a light projecting element, two or more light receiving elements, a light projecting lens for projecting light from the light projecting element onto the roller surface by focusing, and a thread. A light receiving lens that moves the diffusely reflected light from the light receiving element on the light receiving element according to the distance to the roller surface to determine a focal point,
3. A triangulation distance sensor comprising:
A yarn winding detection device for a roller according to any one of claims 1 to 4.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of a main portion of a yarn winding section to which the yarn winding detection device for a roller according to the present invention is applied.
FIG. 2 is a top view of a main part of a yarn winding section to which the yarn winding detection device for a roller according to the present invention is applied.

The yarn winding section 1 shown in FIGS. 1 and 2 is an example of a yarn winding section 1 provided in, for example, a draw false twister and suitable for arranging a plurality of weight winding sections 1 in a horizontal line. The winding unit 1 includes a cradle 11 that supports the winding package P, a friction roller (roller) 12, a traverse device 13, and a yarn winding detection device 14.

The cradle 11 holds an empty bobbin and a take-up package, and is swingable in a direction indicated by an arrow B and in a direction opposite thereto with a point A shown in FIG. This fulcrum A is formed on a frame 16 fixed behind the square angle 15.

The two-dot chain line cradle 11 is at a position where the winding package P is brought into rolling contact with the positively driven friction roller 12 and rotated. As the winding package P becomes thicker, the cradle 11 swings in the direction of arrow B. At the base of the cradle 11, a contact pressure adjusting mechanism 17 for keeping the contact pressure between the winding package P, which becomes heavier as the winding becomes thicker, and the friction roller 12 within a predetermined range.
Is attached.

When the winding package P is fully wound, the cradle 11 is in an inverted position indicated by a solid line.
Is separated from the friction roller 12 and stopped. The inverted posture of the cradle 11 is detected by a limit switch 18. In this inverted posture, one of the pair of arms constituting the cradle 11 can be freely opened and closed in the thickness direction of the drawing, so that the full winding package P can be removed and an empty bobbin can be mounted. .

The friction roller 12 is made of, for example, Bakelite and has a smooth surface. The friction roller 12 is supported on a square angle 15 by a bearing (not shown), and is rotated in the direction of arrow C by a common drive shaft extending in the thickness direction of the paper. Driven. The winding package P that comes into contact with the friction roller 12 rotates in the direction of arrow D. The traverse device 13 hangs the yarn Y on a yarn guide 13a that reciprocates in the thickness direction of the paper surface, and traverses the yarn Y reaching the winding package P via the surface of the friction roller 12, and traverses the square angle 15 in front of the square angle 15. It is attached.

The yarn winding detecting device 14 includes a distance sensor 20 disposed toward the friction roller 12 and a judging section 40 for judging the presence or absence of the yarn winding of the friction roller 12 based on a detection signal from the distance sensor 20. And The distance sensor 20 is housed together with the limit switch 18 in a container-shaped dark room 21 fixed on the frame 16. An opening 21a is provided in the dark room 21 on the side of the friction roller 12, and the upper surface of the dark room 21 can be opened and closed by a cover 21b. The distance sensor 20 is an optical sensor, and its irradiation axis 20a is
Toward the central axis 12a. However, as shown in FIG. 2, it is inclined by a predetermined angle θ with respect to an axis 12b perpendicular to the central axis 12a of the friction roller 12.

Distance sensor 20 selected as optical sensor
The structure and principle of detection will be described with reference to FIG. Distance sensor 2
0 denotes a light projecting element 22 such as an LED, a light receiving element array 23 composed of two or more light receiving elements such as a PSD, and projects light from the light projecting element 22 at a predetermined position on the surface of the friction roller 12. The light projecting lens 24 that emits light and the irregularly reflected light from the yarn are transferred to the surface of the friction roller 12 at distances L1 to L2.
And a light-receiving lens 25 that can move on the light-receiving element array 23 to determine a focal point in response to the above. The illustrated example shows a case where light is irradiated perpendicularly to the surface of the friction roller 12 in order to clearly show the principle of distance detection.

From the distance sensor 20 to the friction roller 1
When the distance to the surface of the light receiving element 2 is L1, the light receiving element row 2
Focusing is made at the point A1 from the lower end of No. 3, and the light receiving element row 23 can identify the position of A1. Distance sensor 20
When the distance from to the surface of the friction roller 12 is L2, the focus is at A2 from the lower end of the light receiving element array 23, and the light receiving element array 23 can identify the position of A2. It is to be noted that a type in which a switch between the distance L1 and the distance L2 is detected by using a two-division photodiode for the light receiving element array 23 and changing the photodiode to be sensed at the distance L1 and the distance L2 can also be used.

The distance sensor 20 is configured to be able to detect the absolute value of the distance by a triangulation method instead of the magnitude of the amount of received light. Therefore, it is hard to be affected by the contamination of the lenses 24 and 25 and the difference in the surface property of the friction roller 12, and stable distance measurement can be performed. In the present invention, instead of using the distance sensor for measuring a specific distance, an object is located at a known distance with the highest sensitivity by using the characteristic of focusing on a predetermined position of the light receiving element array 2 by a predetermined distance. Used to detect whether or not there is. Therefore, a two-division photodiode is sufficient for the light receiving element array 23,
In some cases, even a single light receiving element can be used.
However, since a distance sensor capable of detecting the absolute value of the distance exists as a standard sensor, it is advantageous to use a distance sensor having two or more light receiving elements for detecting whether or not an object exists at a certain distance. This distance sensor 20
This is a reflection-type sensor in which the detection region is limited to a range of a predetermined distance from the sensor 20. Since the detection region is limited, the detection accuracy in the detection region is good, and the difference in the distance of the thickness of one thread is good. Can also be identified.

Next, the operation of the distance sensor 20 arranged toward the friction roller 12 will be described with reference to FIG. The irradiation axis 20a of the distance sensor 20 is inclined at a predetermined angle θ with respect to an axis 12b perpendicular to the center axis 12a of the friction roller 12. Therefore, irradiation axis 2
The light along 0a is reflected by the stable surface of the friction roller 12 formed by polishing the bakelite, and is not reflected by the distance sensor 20 as reflected light 20b. Therefore, the distance sensor 20 determines that there is no object within the set distance L1.

If the yarn is wound around the friction roller 12 by mistake, the twill winding is performed in the traverse range as shown in the figure. Since the friction roller 12 is rotating in the direction of the arrow C, the yarn crosses at the points at the ring-shaped predetermined position W of the friction roller 12. Then, light from the irradiation axis 20a is irregularly reflected by the yarns of the points. Even if the light that is irregularly reflected is slight, the distance sensor 20 that determines the focal point at the distance L1 detects the irregularly reflected light 20c from the yarn, and outputs a detection signal to the determination unit 40. Detects the presence of an object. This allows
The winding of the yarn around the friction roller 12 can be detected from an early stage.

In FIG. 2, visible light such as red is selected as the irradiation light 20a from the distance sensor 20. Then
Adjustment to separate a predetermined distance L1 toward a predetermined position W having a narrow width at the center of the friction roller 12 is performed by the irradiation shaft 2.
0a can be easily confirmed. Also, the center axis 12a
The adjustment to incline by a predetermined angle θ from the axis 12b perpendicular to the axis can be easily performed while checking the irradiation axis 20a. This predetermined angle θ is desirably small enough not to receive the reflected light from the surface of the friction roller 12. This is because the smaller the predetermined angle θ, the more irregularly reflected light 20c from the yarn can be received. Also, the distance sensor 2
0 is installed in a dark room 21 (see FIG. 1), and the irradiation axis 20a
And the light other than the irregularly reflected light from the thread is blocked as much as possible. Therefore, the error movement of the distance sensor 20 is small.

Returning to FIG. 1, the above-described yarn winding detection device 14
The doffing operation of the yarn winding section 1 having the following will be described. For doffing, the yarn winding section 1 further includes a yarn cutting mechanism 31, a yarn end suction mechanism 32, and a yarn hooking mechanism 33.

When the full length of the winding package P is detected by a constant length detecting mechanism (not shown), the yarn cutting mechanism 31 cuts the yarn reaching the yarn guide 13a, and the traverse device 13
Is continuously sucked by the yarn end suction mechanism 32. The winding package P from which the thread has been cut is discharged by setting the cradle 11 in the inverted position of the solid line and opening the cradle 11 in the thickness direction of the drawing. An empty bobbin is supplied to the cradle 11 opened at the inverted position, and the cradle 11 is closed. Then, the cradle 11 is moved to the friction roller 1
2 and the empty bobbin is
To transfer. Next, the yarn hooking mechanism 33 performs an operation of hooking the yarn sucked by the yarn end suctioning mechanism 32 into the notches of the bobbin holder (not shown) at both ends of the empty bobbin. The bobbin holder rotates together with the bobbin, and the yarn hooked on the bobbin holder is hung on the yarn guide 13a of the traverse device 13 on the way to the bobbin, starts traversing, and the winding package P starts to be formed on the bobbin. .

In such a doffing operation, if, for example, the yarn hooking on the notch portion of the bobbin holder fails, the yarn is wound around the friction roller 12 and is hung on the yarn guide 13a of the traverse device 13 to be wound on the friction roller 12. The state shown in FIG. Then, the traverse on the friction roller 12 takes about several reciprocations, and the distance sensor 20 detects irregularly reflected light from the yarn. This detection signal is output to the determination unit 40, and in response to a command from the determination unit 40, the yarn cutting mechanism 31 cuts the yarn reaching the yarn guide 13a, stops the rotation of the friction roller 12,
The yarn continuously supplied to the traverse device 13 is sucked by the yarn end suction mechanism 32, and an alarm is sent to the operator indicating that the yarn needs to be checked. The operator removes the wrong traversing yarn on the friction roller 12, but since the amount of wrapped yarn is small, it can be removed easily and quickly, and the yarn winding operation can be performed again to return to the normal winding operation. become.

In the above-described embodiment, the yarn winding section used in the draw false twisting machine has been described as an example. But,
The winding section of the yarn is not limited to the draw false twisting machine but also exists in the spinning winder. For example, in a spinning winder, a roller in contact with a winding package is called a touch roller. Even when such a yarn winding machine is used, when the yarn is automatically switched from a full winding package to an empty bobbin, winding of the yarn around the touch roller may occur. Can be applied to detect the thread winding.

[0028]

As described above, according to the first aspect of the present invention, the presence / absence of a yarn is directly detected by using an optical sensor, so that the winding of the yarn can be accurately detected. Since the detection is performed, the detection can be performed at a stage where the yarn winding amount is small, so that the yarn winding on the roller can be detected as early as possible without damaging the machine.

According to the second aspect of the invention, in addition to the effect of the first aspect, since the winding of the yarn around the roller can be detected at an early stage, the winding yarn can be quickly removed from the roller.

According to the third aspect of the present invention, it is possible to determine where the light is emitted by using the visible light as the light of the sensor and to easily aim at the predetermined position on the roller surface. Can easily be set for the sensor.

According to the fourth aspect of the present invention, since the irradiation axis is set obliquely toward the center axis of the roller, reflected light from the roller surface is avoided, and irregularly reflected light due to yarn erroneously wound on the roller surface is reduced. Light can be selectively and efficiently received.

According to the fifth aspect of the present invention, the focus of the distance sensor of the triangular distance measuring method is determined so that diffusely reflected light from a yarn erroneously wound at a predetermined position on the roller surface can be detected at a predetermined distance. Since the distance sensor is diverted, it is possible to reliably and quickly detect the winding of the thread around the roller by using a highly accurate and inexpensive distance sensor.

[Brief description of the drawings]

FIG. 1 is a side view of a main part of a yarn winding unit to which a yarn winding detection device for a roller according to the present invention is applied.

FIG. 2 is a top view of a main part of a yarn winding section to which the apparatus for detecting winding of a yarn around a roller according to the present invention is applied.

FIG. 3 is a diagram illustrating a measurement principle of a distance sensor.

FIG. 4 is a diagram showing the operation of the apparatus for detecting the winding of a thread around a roller according to the present invention.

[Explanation of symbols]

 Reference Signs List 1 yarn winding section 12 friction roller (roller) 12a central axis 12b axis perpendicular to central axis 14 thread winding detecting device 20 optical sensor (sensor, distance sensor) 20a irradiation axis 22 light emitting element 23 light receiving element array 24 light emitting Lens 25 Light receiving lens 40 Judgment section P Winding package W Predetermined position L1 Predetermined distance θ Predetermined angle

Claims (5)

[Claims] An optical sensor having a roller rotating in contact with a winding package, a light emitting element for emitting light to the roller, and a light receiving element for receiving light from the light emitting element, and the light receiving light received by the light receiving element A determination unit for determining winding of the thread around the roller based on a state of light from the element. 2. The apparatus according to claim 1, wherein the optical sensor is a reflection-type sensor whose detection area is limited to a range of a predetermined distance. 3. The light of the sensor is visible light.
A yarn winding detection device for the roller as described in the above. 4. The apparatus according to claim 2, wherein an irradiation axis of the light emitted from the sensor is inclined at a predetermined angle with respect to an axis perpendicular to a center axis of the roller. 5. The sensor according to claim 1, wherein the sensor is a light-emitting element, two or more light-receiving elements, a light-emitting lens that focuses light from the light-emitting element on the roller surface and emits the light, and the irregularly reflected light from the yarn. And a light receiving lens that moves on the light receiving element in accordance with the distance to the roller surface to determine a focal point. A device for detecting the winding of a roller.