JPH03223070A - Taking-up method - Google Patents

Abstract

PURPOSE:To stably wind a thread on a package so as to prevent generation of thread breakage by increasing a number of windings, when the thread is traversed to both end parts from the center part in the axial direction of a traverse cam, larger than the number of windings when the thread is traversed to the center part from both the end parts. CONSTITUTION:A number of windings is increased by decreasing a traverse angle beta of a cam groove for guiding a thread to a position of both right and left end parts P, Q from the center C in the axial direction of a cam groove 2 and a number of windings is reversely decreased by increasing a traverse angle alpha of the cam groove 2 for guiding a thread to a position of the center 0 from both the end parts P, Q, in a traverse cam 1. That is, the large traverse angle alpha is formed in a cam groove 2-1 for guiding the thread to a side of the center 0 from a side of the end part P, and the small traverse angle beta is formed in a cam groove 2-2 from a point R of a part of the center 0 to the end part Q. A cam groove 2-3 from the end part Q to the point R in a part of the center 0 is provided with the large traverse angle alpha, and a cam groove 2-4 from the point R to the end part P is provided with the small traverse angle beta.

Description

Detailed description of the invention [Industrial field of application
This invention relates to a winding method that reduces yarn tension fluctuations. [Prior art 1] In this type of conventional winding method, as shown in FIG.
When winding the yarn, it was guided by a traverse cam 13 while being wound. In other words, the thread 14 is traversed while being guided by the guide groove 16 provided in the traverse cam 13 while the thread 14 is supplied from the traverse center 15 portion. This guide groove 16 was set at a constant winding angle θ with a uniform number of winds over the entire width so as to always provide constant feed fog. [Problem to be Solved by the Invention] In such a conventional winding method, as shown in FIG. When the yarn 14 moves from the P side to the center O side by traversing, the yarn path length between the traversing center 15 and the guide groove at the position where the traversing yarn is fitted gradually becomes shorter. The tension of the thread decreases, and then when moving from the center O to the end Q, the thread path length increases, so the tension of the thread increases. This means that when returning from traverse, from end Q to end P.
Similarly, when the yarn moves from the end Q to the center O, the tension decreases, and then when it moves from the center O to the # section P, the tension of the yarn increases. As a result, the tension of the yarn 14 wound around the package 12 varies with each traverse, which not only makes the winding unstable, but also causes yarn breakage when traversing in the direction of increasing tension. [Means for Solving Problems] This month describes a winding method in which a winding package that rotates in pressure contact with a drive drum is wound while being traversed by a traverse cam. The number of winds when swinging the thread toward both ends was made larger than the number of winds when swinging the thread from both ends toward the center. [1] In the method of the present invention, when the yarn is traversed from the axial center of the traverse cam toward both ends, the number of winds is large, so the guided yarn gradually approaches the ends. . That is, the closer the end is, the longer the yarn path length becomes, but since this is done gradually, the rate of increase in yarn tension at that time is small. On the other hand, when going from the end to the center, the thread path length becomes shorter accordingly, so the thread tension decreases, and even a steep traverse with a small number of winds is acceptable. Since the above-mentioned round trip of traverse is fast on one side and slow on the other, it is possible to avoid changing the number of traverses within a predetermined time as a whole. [Actual Example 1] An example of the present invention will be described based on FIG. 1. FIG. 1 shows a traverse cam 1 to which the winding method of the present invention is applied, and the traverse cam 1 has a cam 2112 as shown. FIG. 1 is a side view schematically showing a cam groove of a traverse cam 1, and FIG. 2 is a partially developed view of the traverse cam. As is clear from this, the winding angle β of the cam groove that guides the yarn from the axial center O of the cam groove 2 in the traverse cam 1 to the positions of both left and right ends P and Q is made smaller to increase the number of winds, and vice versa. The winding angle α of the cam groove that guides the yarn from both ends P and Q to the center 0 position is increased to reduce the number of winds. That is, as shown in FIG. 1, the cam groove 2-1 that guides the yarn from the end P side to the center O side has a large winding angle α, and the cam groove 2-1 between the point R at the center 0 part and the end Q 2-2 is a small helix angle β
shall be. Cam groove 2- from end Q to point R at center 0 part
3 has a large winding angle α, and the cam groove 2-4 between point R and end P has a small winding angle β. When using a traverse cam equipped with the cam groove formed in this way, when guiding the thread from the end P side to the center O side,
Since the yarn path length becomes shorter as it approaches the center O side from the end P side, yarn breakage does not occur even if the winding angle α is increased to speed up the traverse movement of the yarn. On the other hand, when guiding the yarn from the center 0 side to the end P side, the yarn path length gradually becomes longer as it approaches the end P side from the center side O.
System tension tends to increase. Therefore, the wind angle β
If the traverse movement of the yarn is performed gradually by decreasing the value, the fluctuation rate of the yarn tension as the yarn path length increases is small, and the tension increases gradually, so the system is not strained and yarn breakage does not occur. It becomes difficult. The same applies when the thread is swung from the end Q side to the other end P side. In the above embodiment, the traverse angle of the traverse cam groove that guides the yarn is set to a uniform traverse speed both toward the ends and toward the center. nearby locations, etc.
There is no problem in changing the traverse angle depending on the position. That is, when going from the center to the end, the angle θ can be made larger at a position near the center and smaller as it approaches the end. In the above embodiment, an example was shown in which the yarn was directly traversed by the traverse cam, but the same applies to the case where the traverse cam drives the branching guide via the guide rod. Furthermore, this traverse cam can also be used for conventional creeping purposes. (Effects of the Invention) The winding method of the present invention is a winding method in which a winding package that rotates in pressure contact with a drive drum is wound while being traversed by a traverse cam. Since the number of winds when swinging the thread toward the traverse cam is greater than the number of winds when swinging the thread from both ends toward the center, the W! When swinging, the rate of increase in tension is reduced, and not only can the thread be wound around the package more securely, but also the thread is not strained, which prevents thread breakage.

[Brief explanation of drawings]

1 and 2 show a traverse cam used in the winding method of the present invention, FIG. 1 is a side view schematically showing the cam groove of the traverse cam 1, and FIG. 2 is a part of the traverse cam. FIG. 3 is a side view of a winding equipment using a conventional winding method. 1... Traverse cam, 2... Cam groove.

Claims (1)

[Claims] 1. The winding package rotates in pressure contact with the drive drum,
In a winding method in which a traverse cam is used to wind the thread while traversing, the number of winds when the thread is swung from the axial center of the traverse cam toward both ends is determined by the number of winds when the thread is swung from both ends toward the center. A winding method characterized in that the winding number is smaller than the number of winds.