JPH05769A - Method of adjusting tension in winding filament - Google Patents

Abstract

(57) [Summary] [Purpose] Adjusting both the long-cycle and short-cycle tension fluctuations that occur in the filament during the coiling operation of the filament, A method for adjusting tension in winding is provided. [Structure] After passing the linear body 1 through a dancer pulley device 3 including a fixed pulley 31 and a movable pulley 32,
The winding direction is changed by 90 degrees or more by winding it around the direction changing pulley 41, which has a rotating surface in one plane including the running line of the linear body 1, and is wound on the winding bobbin 2.
The direction change pulley 41 of the slight fluctuation absorbing device 4 is movably supported on the bisector of the angle formed by the traveling line before and after the direction change by the direction change pulley 41, and is constantly pressed in the direction in which the linear body is stretched. Since the direction change angle of the direction change pulley 41 exceeds 90 degrees, the amount of movement of the direction change pulley 41 with respect to the tension change of the filament 1 is large, and sensitive and precise adjustment is possible.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tension adjusting method for winding a filament.

[0002]

2. Description of the Related Art Considering the process of feeding various filaments and winding them on a take-up bobbin, the take-up tension of the filaments constantly fluctuates due to some cause on the feeding side or the take-up side. Is normal. In order to absorb such a fluctuation in tension and wind it with a tension as constant as possible, it has been widely practiced to provide a dancer pulley device between the feeding side and the winding side.

[0003]

When the filament is aligned and wound on the winding bobbin, the reason why the filament rides on the previous winding layer or, conversely, falls from one layer For some or other accidental reasons, minute and very short-period vibrational tension fluctuations often occur. Moreover, such tension fluctuations occur frequently when the filament is a rectangular wire, and this is one of the factors that hinder the constant tension winding on the winding bobbin. The dancer pulley device arranged between the sending side and the winding side is generally capable of absorbing tension fluctuations that continue for a relatively long time period, but short period, specifically Has a drawback that it cannot cope with short cycle fluctuations of approximately 5 Hz or less.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a linear body is provided with a fixed pulley and a movable pulley that is movable in a direction of approaching or separating from the fixed pulley. And a step of changing the traveling direction by 90 degrees or more by hanging it around a direction changing pulley that places a rotation surface in one plane including the traveling line of the linear body. The line-changing pulley is movably supported on the bisector of the angle formed by the running line before and after the direction change, and is constantly pressed in the direction in which the line body is stretched. It is a method of adjusting the tension in winding the body.

[0005]

The tension pulley fluctuations that occur during the winding process of the filament are absorbed by the dancer pulley device, and the tension fluctuations that cannot be absorbed by the dancer pulley device are comparatively short. The fluctuation absorbing device adjusts, and thus the work of winding the filaments at a constant tension can be reliably performed.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 shows an example of an apparatus used to carry out this method, which will now be described in detail with reference to this FIG. The linear body 1 is a linear body having various cross sections such as a circular shape and a rectangular shape, and the linear body 1 is a fixed pulley 31.
And a fine fluctuation absorbing device 4 which is an indispensable device for carrying out the method of the present invention, passing downstream through a dancer pulley device 3 composed of a movable pulley 32 which is movable in a direction toward or away from it. Direction change pulley 41
It is wound around a winding bobbin 2 after being turned around by an angle θ.

The minute fluctuation absorbing device 4 rotatably supports a very light direction-changing pulley 41 at the tip of a supporting rod 42, and this supporting rod 42 is elastic in a direction in which the filament 1 is always stretched by a weak compression spring 43. Is configured to press. Note that the direction change pulley 4
Reference numeral 1 designates a plane of rotation of the linear body 1 in one plane, and the supporting rod 42 bisects the angle formed by the traveling lines before and after the direction change of the linear body 1 by the direction change pulley 41 in that plane. To extend the line position. It is preferable that the actual direction change pulley 41 has a weight of 50 grams or less and the spring constant k of the compression spring 43 is 50 g / mm or less.

In the present invention, since the traveling direction of the linear body 1 is changed by the direction change pulley 41 by θ> 90 degrees or more, the linear body 1 at the point P with reference to FIG.
The angle formed by the running lines before and after the direction change pulley 41 is naturally smaller than 90 degrees. Assuming that the tension T of the filamentous body 1 has a minute increase of ΔT, the increased tension pushes the direction change pulley 41 in the extending direction of the support rod 42 to displace it by Δx to balance. At this time, the balance equation is such that the spring constant of the compression spring 43 is k
Is represented by kΔx = 2ΔTsin (θ / 2).
Since θ is greater than 90 degrees, the sine value of this equation is sin45
The value is larger than ° ≈ 0.71, and this value is considerably larger than the maximum value 1 of the sine. Therefore, it can be seen that the value on the right side of the above equation is considerably large even when the fluctuation ΔT in tension is small. Therefore, if the spring constant k of the compression spring 43 is smaller than the value on the right side to some extent, a considerably large displacement occurs as Δx, that is, the direction change pulley 41.
It can be seen that is sensitive to minute tension fluctuations of the filament 1 and enables precise tension adjustment.

[0009]

According to the present invention, the long-period tension fluctuation caused by any cause during the winding operation of the filamentous body can be adjusted by the dancer pulley device, and similarly, depending on the dancer pulley device caused by some cause. Since short-term tension fluctuations that cannot be adjusted can be precisely adjusted by the fine fluctuation absorbing device, the work of winding the filaments at a constant tension is always guaranteed, and the filaments are aligned and wound onto the winding bobbin. There are advantages that can be implemented.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an example of an apparatus used for carrying out the method of the present invention.

FIG. 2 is a diagram for explaining the accuracy of tension variation detection by a direction change pulley.

[Explanation of symbols]

 1 linear body 2 winding bobbin 3 dancer pulley device 31 fixed pulley 32 movable pulley 4 slight fluctuation absorbing device 41 direction change pulley 43 compression spring

Claims (1)

[Claims] [Claim 1] The linear body (1) is fixed to a fixed pulley (31).
And a step of passing through a dancer pulley device (3) consisting of a movable pulley (32) that is movable in a direction toward or away from it, and in a plane including the traveling line of the linear body (1). The step of changing the traveling direction by 90 degrees or more by hanging it around the direction changing pulley (41) on which the rotating surface is placed, and the direction changing pulley (41) has an angle formed by the traveling lines before and after the direction change. A tension adjusting method for winding a filament, which is movably supported on a bisector and is constantly pressed in a direction in which the filament (1) is stretched.