JPH07232865A - Yarn winding paper bobbin - Google Patents

Abstract

PURPOSE:To provide a paper bobbin by which a yarn can be accurately caught and cut by providing, in pinching grooves, two kinds to four kinds of pressing pinching parts whose groove width is stepwise narrowed. CONSTITUTION:An introducing groove 2 and pinching grooves 3 are provided on the outer peripheral surface near the end of a paper bobbin body part 1. The introducing groove 2 is composed of a wide opening part 4 and a V-shaped valley part 5 to be narrowed toward the bottom part from the opening part 4. The pinching grooves 3 are zigzag constituted, and its inner wall surface is a rough surface. Accordingly, a yarn easily enters the pinching grooves 3 from the introducing groove 2 in the automatic switching from a full wound paper bobbin to an empty paper bobbin. Since the pinching grooves 3 are formed into a zigzag shape, and since its inner surface is a rough surface and also since its pressing pinching part is formed into steps, the yarn can be impulsively and firmly caught, pinched and cut. Thereby the yarn take-up factor is greatly improved, and waste of yarn caused by poor take-up can be greatly decreased, so as to contribute to productivity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a yarn winding paper tube in a spinning process of synthetic fibers such as polyester and nylon.

[0002]

2. Description of the Related Art When winding a yarn made of high-grade fine count synthetic fiber such as polyester, it is very fast, and because it is a fine count, it is difficult to take up the yarn, and the yarn take-up rate tends to decrease. Further, in the case of synthetic fiber, since it is directly and continuously supplied from the spinning process, it is necessary to automatically switch the yarn from the fully wound paper tube to the empty paper tube. At the time of this switching, the yarn at the beginning of winding is temporarily relaxed, so that a phenomenon in which the yarn is reliably captured, grasped, and not cut occurs, and a yarn take-up failure to the empty paper tube occurs.

When a yarn removal failure occurs recently, the yarn is supplied at a speed of 6000 to 8000 m / min from the spinning process, and therefore a loss of 100 m or more occurs even if it is delayed for 1 second. Normally, when a plurality of paper tubes are fitted on one rotary shaft for winding, if a winding failure occurs in one paper tube, all the paper tubes of the same shaft are taken up from the beginning. , The yarn in the meantime is wasted.

Therefore, it is required that the thread take-up rate be almost 100%.

For this reason, various paper tubes have heretofore been devised to improve the yarn take-up rate. For example, actual fair 1-
No. 33565 and Japanese Utility Model Publication No. 3-30378. This is shown in FIG. A wide introduction groove 12 in the circumferential direction is formed in a part of the outer periphery of the paper tube main body 11 near the end.
In addition, a gripping groove 13 formed in a saw blade shape or a zigzag shape on the extension line thereof, and then a cutting groove 14 is further used.

In this paper tube, since the introduction groove 12 is formed wide, it is easy to introduce, and the gripping groove 13 is zigzag and the inner surface is rough, so that the gripping is relatively reliable. In addition, the yarn is surely cut in the cutting groove 14, so that the yarn take-up rate is relatively excellent.

[0007]

However, even in this conventional paper tube, since the gripping groove and the cutting groove are engraved by the blade, the sharpness of the blade itself to be processed and the deformation due to abrasion cause , Because a uniform processing shape cannot be obtained,
If the shape is different from the desired shape, yarn removal failure may occur.

Further, if the shape of the groove changes after being engraved, it will also hinder the thread catching and cutting. That is,
This means that if the relationship between the groove and the yarn changes, the yarn take-up rate will be affected. The relationship between the groove and the yarn changes
The main causes are the following three items. Variations in processing due to processing tools and paper tube materials Variations with time in the processing area due to temperature and humidity Handling by thread type and denier

Therefore, there has been a demand in the industry for a paper tube which does not have the above-mentioned problems and which can reliably capture and cut a yarn.

[0010]

[Means for Solving the Problems] In view of such a current situation,
The present inventor has completed the paper tube of the present invention as a result of diligent research, and is characterized in that the outer peripheral surface near the end of the paper tube main body has a wide introduction groove and a facing surface in the groove. Is a paper tube in which a gripping groove formed on a rough surface is engraved, and the gripping groove is provided with a pressing narrow portion of 2 to 4 kinds in which the groove width is gradually narrowed.

The introduction groove is a groove for guiding the yarn to a gripping groove, which will be described later, and has a wide surface so that the yarn can be introduced even if the yarn is slightly displaced laterally. The trough, which is the deep groove, is generally configured to be linear in a plan view and substantially V-shaped in a cross section in order to reliably feed the yarn to the next gripping groove. However, the deep groove may be bent in a plan view, like the gripping groove described later. In this case, the width of the bent groove is made larger than the width of the grip groove so that the yarn can be easily inserted.

The gripping groove is a portion for gripping the yarn and holding the yarn at the start of winding. If the yarn is not securely held here, the yarn is wasted. The shape of the groove is a bent shape in a plan view, and the end opening to the outer peripheral surface of the paper tube body is widened (rounded). The term "bent shape" as used herein refers to a finely bent state such as a saw blade shape or a zigzag shape. The degree of zigzag (number, angle, relationship with groove width, etc.) is arbitrary, but it is naturally limited by the diameter of the yarn. Zigzag is
This is to increase the resistance with the yarn there. Furthermore, the inner wall surfaces facing each other are also roughened. This may be achieved by cutting a part of a sharp blade when making a cut, that is, engraving with a partly rough blade. The roughening is also to increase the resistance to the yarn.

Further, a linear groove in a plan view, which is a so-called close groove, having a very narrow gap may be provided on an extension line of the gripping groove.

The above-mentioned introduction groove, gripping groove, and if necessary, a close groove are usually provided in a part of the outer circumference of the paper tube.
It may be provided over almost the entire circumference.

The pressing narrow portion is a portion that constitutes a holding groove, and this is a characteristic portion of the present invention. That is, the paper tube is pressed from both upper sides of the grip groove to narrow the groove. Any pressing method or pressing tool may be used. The pressing narrow portion is provided so that the groove width is gradually narrowed in two or four kinds. That is, the pressing narrow portions are separated from each other, and the individual pressing narrow portions are formed to have a constant groove width. However, the groove width of each pressing narrow portion is different, and the groove width is gradually narrowed. This allows
The gripping force of the yarn increases stepwise, and it bites more dynamically, that is, shockingly than in the continuous case. The shape of the pressing narrow portion (the shape of the recess seen from the surface of the paper tube) may be any shape, such as a rectangle, a circle, an ellipse, or a trapezoid.

With respect to the number of the narrow portions, one is small and the effect is small, and 2 to 4 are most effective from the economical point of view. Further, the position and size of the pressing narrow portion, that is, the length in the circumferential direction can be freely set. In the case of the same pressing force, if the circumferential length of the pressing tool is shortened stepwise, the pressure increases and the groove width gradually decreases.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail based on the embodiments shown in the drawings. FIG. 1 is a perspective view showing an example of the paper tube of the present invention, in which an introduction groove 2 is formed on the outer peripheral surface near the end of the paper tube body 1.
And a grip groove 3 are provided. As shown in the cross section of FIG. 2, the introduction groove 2 is composed of a wide opening 4 and a V-shaped valley 5 narrowing from the opening 4 toward the bottom. The grip groove 3 is formed in a zigzag shape, and the inner wall surface is a rough surface.

The grip groove 3 is provided with three pressing narrow portions (a pressing narrow portion A, a pressing narrow portion B, and a pressing chest C, respectively). FIG. 3 is a cross section of the grip groove that is not pressed, and since the groove is zigzag, the tip of the bent portion is visible near the center. In addition, the position of the groove most swayed to the left and right is schematically shown by a broken line in this figure.

FIG. 4 is an end view of the grip groove, and when pressed in the direction of arrow A, the state shown by the broken line is obtained.
That is the cross section of the pressing narrow portion A.

FIG. 5 is an end view of the pressing narrow portion B, and FIG.
It can be seen that the groove width is narrower than the broken line part. Also,
Since the groove width is not simply narrowed but the upper portion of the groove is narrowed, it is difficult for the thread to exit once the thread enters the groove. Further, the inner wall is a rough surface 6 (the portion is omitted in FIG. 4). FIG. 6 is an end view of the pressing narrow portion C, which shows a state in which there is almost no groove width and the contact is close.

[0021]

As described above, in the paper tube of the present invention, the introduction groove and the gripping groove are engraved in the circumferential direction on the outer peripheral surface in the vicinity of the end portion of the paper tube body, and the pressing narrow portion has a stepwise width. Since it is provided in a reduced size, when automatically switching from the full paper tube to the empty paper tube, the yarn easily enters the holding groove from the introduction groove. Since the gripping groove is formed in a zigzag shape, the inner surface is a rough surface, and the pressing narrow portion is formed stepwise, it is possible to capture, grip, and cut the yarn firmly and shockably.

Therefore, the yarn take-up rate is greatly improved, the waste of the yarn due to the yarn take-up failure can be greatly reduced, and the productivity is improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a paper tube of the present invention.

FIG. 2 is an end view of an introduction groove of the paper tube shown in FIG.

FIG. 3 is a sectional view of an unpressed holding groove of the paper tube shown in FIG.

FIG. 4 is an end view of an unpressed holding groove of the paper tube shown in FIG.

5 is an end view of the pressing narrow portion of the holding groove of the paper tube shown in FIG.

6 is an end view of another pressing narrow portion of the holding groove of the paper tube shown in FIG.

FIG. 7 is a perspective view of a conventional paper tube.

[Explanation of symbols]

 1 paper tube 2 introduction groove 3 gripping groove 4 opening 5 valley 6 rough surface

Claims (2)

[Claims] 1. A paper tube in which an outer peripheral surface near the end of the paper tube main body is engraved with a wide introduction groove and a holding groove having a bent shape in a plan view in which opposing surfaces in the groove are roughened. Yes, in the grip groove,
A yarn winding paper tube provided with two or four kinds of pressing narrow portions in which the groove width is gradually narrowed. 2. The yarn winding paper tube according to claim 1, wherein the wide groove has a deep groove bent in a plan view.