JPH08169637A - Winding method - Google Patents

Abstract

PURPOSE: To check any variation in yarn tension as well as to prevent a density difference in the yarn layer of a roll package from occurring by controlling a winding speed according to the diameter of a yarn feed bobbin at a time when the yarn of this yarn feed bobbin is wound up. CONSTITUTION: A winding unit 11 is equipped with a grooved drum 14, caning into contact with a yarn layer of a roll package 12 and rotating this yarn layer, and a detecting means 17 for detecting the diameter of a yarn feed package 16 erected on a tray 15, respectively. This detecting means 17, consisting of a phototube 20 and a reflector 21, detects a fact that the yarn feed package 16 is decreased up to the specified diameter or a control point at a time when a value of yarn tension to be detected by a tensiometer 24 is largely varied. Then, from the detection of this control point, a grooved drum driving motor 18 is decelerated at the constant deceleration by a controller 19, and thereby a variation in the yarn tension is checked, so such a possibility that a density difference might be produced in the yarn layer of the roll package 12 is preventable in this way.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a yarn winding method.

[0002]

2. Description of the Related Art In the case of dyeing package reforming, a yarn supplying package is used to rewind a yarn feeding package into a predetermined shape such as cheese. That is, the yarn feeding package is unwound at high speed by driving the winding mechanism of the winder,
The yarn is wound and formed into a winding package.

[0003]

However, in the conventional winding method, as shown in FIG. 7, the yarn layer 2 of the winding package 1 has a portion 3 having a high density, and the end face 4 has irregularities. There was something that happened. Such a difference in the density of the yarn layers 2 deteriorates the quality of the winding package 1 and causes uneven dyeing in the subsequent dyeing process. This phenomenon is considered to be caused by fluctuations in the yarn tension (winding tension) during winding. That is, as shown in FIG. 8, when the winding progresses at a constant winding speed (V _O ), and the remaining yarn in the yarn supply package decreases and the unwinding is almost finished (point A), the yarn tension T rapidly increases. It rises and is wound up in high density.

Therefore, the present invention was devised to provide a winding method capable of suppressing the fluctuation of the yarn tension and preventing the difference in the density of the yarn layers of the winding package.

[0005]

According to the present invention, when winding a yarn of a yarn supplying bobbin whose diameter decreases with the unwinding of the yarn,
The winding speed is controlled according to the diameter of the yarn supplying bobbin. Further, the winding speed is reduced when the diameter of the yarn supplying bobbin reaches a predetermined value. The winding speed is controlled according to the diameter of the yarn supplying bobbin, and the position of the balloon regulating member that regulates the balloon formed by the yarn unwound from the yarn supplying bobbin is controlled.

[0006]

By controlling or reducing the winding speed in the above method, it is possible to prevent the yarn tension from rapidly increasing.
And by the method of controlling the balloon regulating member, the balloon becomes an appropriate size and the thread tension decreases,
Minimize the time required to control the winding speed.

[0007]

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

FIG. 1 shows a first embodiment of a winding method according to the present invention. A winding unit 11 of a winder for carrying out this winding method includes a yarn layer 1 of a winding package 12 supported by a holder (not shown).
3 is provided with a grooved drum 14 for contacting and rotating the yarn 3, and a detecting means 17 for detecting the diameter of the yarn supplying package 16 provided upright on the tray 15. The grooved drum 14 includes a motor 18 serving as a rotation drive source,
A controller 19 for variably controlling the rotation is provided and normally rotates at a predetermined high speed. The detection means 17 is connected to the controller 19 and is provided in the vicinity of the yarn supply package 16 for the photoelectric tube 2
0 and a reflection plate 21 provided on the side opposite to the phototube 20 with the yarn supplying package 16 interposed therebetween. As also shown in FIG. 3, the phototube 20 is oriented so that the light hits a position radially separated from the axial center of the yarn supplying package 16 by a predetermined distance. That is, when the yarn supplying package 16 is reduced to a predetermined diameter φ, the reflecting plate 21 installed on the opposite side is provided.
When the light passes through and the reflected light is sensed by the light receiving portion, the fact that the thread tension T has increased is transmitted to the controller 19.

The increase in the yarn tension T is caused by the unwound yarn y wound around the outer peripheral end of the yarn layer 22 of the yarn supplying package 16 or the core tube 23 for preventing uneven dyeing or paper (not shown). No)
It is caused by rubbing. Therefore, it is necessary to reduce the winding speed V so that the balloon shape does not become an excessively long shape so that the balloon diameter becomes larger than that of the yarn supplying package 16 whose diameter decreases as the yarn y unwinds. . In other words, the diameter of the yarn supplying package 16 is
When it becomes larger than the balloon diameter under a constant speed, it becomes the control point P at which the control of the winding speed V should be started. As the control point P, it is preferable to continuously measure the yarn tension T by the tension meter 24 provided in the winding unit 11 and obtain the diameter φ when the value is greatly changed. The predetermined diameter φ is, for example, around 30% of the full winding diameter. However, if the balloon diameter becomes excessively large, centrifugal force acts on the balloon B, and the thread tension T also increases. Therefore, the size of the balloon B can be said to be the most appropriate diameter when the unwound yarn y is slightly floating from the surface of the yarn layer 22. The winding speed V after the control point P is set so as to maintain such a state.

In this embodiment, as indicated by the solid line V _{1 in} FIG. 2, the control point P is uniformly decelerated with a constant deceleration. For example, the winding speed V is decreased so as to be about 80% of the steady speed V _O when the unwinding of the yarn supplying package 16 is completed. With this, the thread tension T
Is reduced by directly reducing the yarn speed, and the balloon B has an appropriate size without rubbing the yarn layer 22, and the yarn tension is increased until the unwinding of the yarn supplying package 16 is completed. Since T is kept substantially constant, it can be wound into a uniform density. That is, it is possible to obtain a high-quality winding package 12 having no step winding, and it is possible to prevent uneven dyeing in a dyeing process which is a post process. Further, since the thread tension T does not rise, thread breakage due to abnormal tension can be prevented.

The detection means 1 for the control point P
The distance sensor 31 shown in FIG. 4 is not limited to the photoelectric tube 20 and may be used. This distance sensor 31
Is installed so as to face the axis of the yarn supplying package 16 so as to measure the distance to the surface of the yarn supplying package 16, and detects a change in the diameter of the yarn supplying package 16 as a change in the measuring distance. Then, the control point P is detected. In addition, the weight of the yarn supplying package 16 may be continuously measured by a weight sensor, and the winding speed reduction may be started when the weight reaches a preset weight. The control point P may be detected by the winding time (unwinding time).

Further, in the above-mentioned embodiment, the winding is carried out at a constant speed (V _O ) until reaching the control point P, but as shown by the broken line V _{2 in} FIG. Alternatively, the winding speed may be changed. This control keeps the winding speed V determined by the rotation speed of the grooved drum 14 and the diameter φ of the yarn supplying package 16 in a predetermined relationship. For example, a simple proportional relationship (V
= A × φ) or a function (V = f (φ) + b)
The control program of the controller 19 is set so as to establish the relationship according to. By changing the winding speed V in this manner, the diameter of the balloon B that is being unwound is always larger than the diameter of the yarn supplying package 16 and smaller than the diameter on which excessive centrifugal force acts. Can be one.

Further, instead of decreasing the winding speed V in a preset manner, feedback control may be performed such that the winding speed V is increased or decreased so that the yarn tension T becomes constant. In this case, the tension meter 24 is connected to the controller 19, the detected value and the set value (optimal tension) are compared, and if there is a difference between these values, the rotation speed of the motor 18 is adjusted so as to eliminate this difference. Shall be changed. By so doing, it is possible to ensure a constant thread tension T. The tension meter 24 may be of any type as long as it can measure the thread tension T in addition to the contact type using a load cell as shown in the figure.

Next, a second embodiment of the present invention will be described with reference to FIG. In this embodiment, the winding unit 41 includes, in addition to the grooved drum 14, the tension meter 24 and the detecting means 42, a yarn guide 43 which is a balloon regulating member for controlling the balloon B of the yarn unwound from the yarn supplying package 16. The winding speed V is controlled according to the diameter of the yarn supplying package 16, and the position of the yarn guide 43 is controlled.

The yarn guide 43 is used for the yarn supplying package 16
It comprises a tubular member 44 for guiding the yarn y unwound from the to the grooved drum 14, and a support member 45 for positioning the tubular member 44 coaxially with the yarn feeding package 16. Therefore, the balloon B at the time of unwinding is formed between the yarn layer 22 of the yarn supplying package 16 with the position of the lower end inlet 46 of the tubular member 44 as the apex. The support member 45 is held by a moving mechanism 47 so as to be movable up and down. Moving mechanism 47
Is provided in parallel with the air cylinder 49, a bracket 48 attached to a fixed system such as a frame (not shown) of the winding unit 41, an air cylinder 49 having a base end attached to the bracket 48 and hanging down. It is composed of a guide bar 50. The piston rod 51 of the air cylinder 49 is connected to the other end of the support member 45, and the yarn guide 43 is moved up and down along the guide bar 50 by advancing and retracting the piston rod 51. An electromagnetic valve 53 is provided on the air supply pipe 52 of the air cylinder 49, and is opened / closed by an operation command from the controller 54. In the present embodiment, the yarn guide 43 is fixed at a predetermined height such that a single balloon B is formed from the start of unwinding of the yarn supplying package 16, and as shown in FIG. The distance sensor 31 detects the first control point P _{1 at} which the yarn tension T rapidly increases in the state where the winding speed is constant (V _O ), and at this time, the air cylinder 49 is operated to move the yarn guide 43 downward. To be appropriately moved (shown by a solid line H in FIG. 6). Ie yarn guide 4
By lowering 3, the balloon diameter is made larger than that of the yarn supplying package 16 and the excessive centrifugal force does not work.
This descent is performed continuously at a preset constant speed,
It may be lowered stepwise. Alternatively, it may be continuously lowered so as to be gradually faster.

If the yarn tension T rises again even after the height control of the yarn guide 43 is performed in this way, the winding speed V is decreased to suppress the yarn tension T (V ₃ ). At this time, the second control point P ₂ is detected by detecting the thread tension of the tension meter 24, for example. That is, between the yarn guide 43 and the grooved drum 14, the tension T of the traveling yarn y is constantly detected as a change in contact load, and if the detected value becomes larger than the normal minute fluctuation range, the winding is performed. The speed control shall be started. It should be noted that this control start (P ₂ ) may be performed when a predetermined time has elapsed from the first control point P ₁ . Further, similarly to the first control point P ₁ , it may be detected by the diameter of the yarn supplying package 16. Further, based on the yarn tension detection value by the tension meter 24, feedback control may be performed such that the yarn guide 43 is moved up and down and the winding speed V is increased or decreased so that the yarn tension T does not deviate from a predetermined allowable range.

By performing such a two-step control, the period for reducing the winding speed V can be shortened to the minimum necessary period, and the production efficiency can be prevented from decreasing. The winding speed V may be gently reduced at the first control point P ₁ , and then the yarn guide 43 may be lowered. Even in this case, the winding time can be prevented from becoming long.

Although the yarn guide 43 is shown as the balloon regulating member in the present embodiment, the yarn guide fixedly provided immediately above the yarn supplying package 16 and serving as the fulcrum of the balloon B and the bulging portion of the balloon B are directly connected to each other. It may be provided with an opening / closing type restriction guide for suppressing. This regulation guide is provided, for example, by providing a cylindrical plate that has been split into pieces above the yarn supplying package 16, and by sliding or opening and closing the pair of plates appropriately in the direction toward and away from each other, the inner surface of the regulation guide becomes the balloon B. The balloon diameter is expanded or contracted by making contact.
Even if the balloon diameter is directly controlled in this way, the thread tension T can be adjusted similarly to the height control of the yarn guide 43.

[0019]

In summary, according to the present invention, it is possible to suppress the abnormal fluctuation of the tension of the unwound yarn and to prevent the difference in the density of the yarn layers of the winding package. Demonstrate.

[Brief description of drawings]

FIG. 1 is a perspective view of a winder for explaining a first embodiment of a winding method according to the present invention.

FIG. 2 is a diagram showing changes over time in yarn tension and winding speed for explaining the function and effect of FIG.

FIG. 3 is a plan view showing the detection means of FIG.

FIG. 4 is a plan view showing another embodiment of the detecting means shown in FIG.

FIG. 5 is a perspective view showing a second embodiment of the present invention.

6 is a time-dependent change diagram of the yarn tension, the winding speed, and the height of the yarn guide for explaining the operation of FIG.

FIG. 7 is a partial cross-sectional view of a winding package for explaining the problems of the conventional technique.

FIG. 8 is a diagram showing a change in yarn tension with time according to a conventional winding method.

[Explanation of symbols]

 12 winding package 14 grooved drum 16 yarn feeding package (yarn feeding bobbin) 17 detecting means 19, 54 controller 24 tension meter 43 yarn guide (balloon regulating member) V winding speed y yarn φ predetermined diameter of yarn feeding package

Claims (3)

[Claims] 1. A winding method, wherein when winding a yarn of a yarn supplying bobbin whose diameter decreases as the yarn is unwound, a winding speed is controlled according to the diameter of the yarn supplying bobbin. 2. When winding the yarn of the yarn supplying bobbin whose diameter decreases with the unwinding of the yarn, the winding speed is reduced when the diameter of the yarn supplying bobbin reaches a predetermined value. Winding method. 3. When winding a yarn of a yarn supplying bobbin whose diameter decreases with the unwinding of the yarn, the winding speed is controlled according to the diameter of the yarn supplying bobbin, and the yarn is unwound from the yarn supplying bobbin. A winding method comprising controlling the position of a balloon regulating member that regulates a balloon formed by a yarn.