JPS6268B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for manufacturing a bobbin for thread winding, and particularly to a method for manufacturing a bobbin that can reliably thread and wind a fine denier thread.

[Prior art]

Conventionally, bobbins have been known in which a thread trap consisting of a plurality of recesses is provided directly in the thread engagement groove in order to reliably hook and wind high denier thread (for example, 150 denier) (Japanese Patent Publication No. 1973- Publication No. 14972)
However, test results show that because both walls of the groove are pressed and deformed, the pressed part becomes dense and hard, and the V-shape of the groove collapses and the opening is closed. , the thread will not be inserted into the groove but will be wrapped over the trap. High denier threads can be forcibly interlocked, but thin threads of medium denier or less will break.

In this way, fine denier threads have been actively developed in recent years and are expected to be used for a variety of purposes.
With conventional bobbins, it is difficult to thread the thread reliably.

In other words, with fine denier thread (for example, 70, 50, 30 denier), even if you use a conventional bobbin for high denier as well as medium denier, the groove width is too wide and the thread will fall out. Unable to hold thread securely.

[Purpose of the invention]

The purpose of the present invention is to overcome the limitations of such conventional bobbins and to
An object of the present invention is to provide an improved method for manufacturing a bobbin for thread winding, which is capable of reliably gripping threads of fine denier as well as threads of fine denier.

[Structure of the invention]

To achieve this object, the method for manufacturing a bobbin for thread winding of the present invention has a structure in which a gently inclined thread guide groove and a narrow V-shaped thread holding groove are provided along the circumferential direction of the end of the bobbin. and a step of pressing the outside of the retaining groove to form a recess so that the surface portion of the retaining groove locally bulges into the retaining groove and comes into contact with the opposing side wall. It is.

〔Example〕

Hereinafter, the present invention will be explained by way of an example in contrast with FIGS. 1 to 3. That is, in Figure 1,
FIG. 2 is a developed plan view of a thread winding bobbin manufactured by the method of the present example, and FIG. 2 shows a cross-sectional view taken along the line A-A, and FIG. 3 shows a cross-sectional view taken along the line B-B.

As shown in FIG. 1, the bobbin 1 has a groove 2 bored in the circumferential direction at its end for guiding and holding the thread, and has a plurality of recesses 3 along both sides of the groove 2. are doing.

The groove 2 has a cross-sectional structure as shown in Fig. 2, with a yarn guide groove 2a gently inclined toward the center for guiding the yarn, and a deep slit-shaped yarn for gripping or holding the yarn. It consists of a holding groove 2b.

FIG. 3 is a sectional view showing the bulge 4 made according to this embodiment, and the bulge 4 is provided on the surface of the thread holding groove 2b. This bulge 4 is formed by the recess 3 on the outside of the groove 2 .

To create the bulge 4 in contact with the groove 2,
First, a groove 2 as shown in FIG. 2 is cut. Next, a recess 3 is formed near the groove 2 with a gap corresponding to the width of the bulge 4 using a punch or the like. Then, the surface portion on the groove side is pushed out toward the yarn holding groove 2b side, and the surface slants toward the yarn holding groove 2b as shown in the figure and bulges out, opposite to the yarn holding groove on the opposite wall. It comes into contact with the side wall. In other words, it is sufficient to simply drill the recess 3 so as to make contact with the wall surface of the slit groove 2b of the bulge 4.

Therefore, the yarn guided into the groove 2 is pulled into the yarn holding groove by the tension applied to the yarn along the slope of the bulge 4, so that the bulges 4 that are in contact with each other are drawn into the yarn holding groove. The thread can pass through the gap and enter the groove 2b, and once it is inside, it will not come out again, so it can be gripped reliably.

Moreover, in the bobbin 1 of this embodiment, the part where the bulging part 4 is provided and the thread guiding groove 2a are provided separately, so the thread guiding function is lost by forming the bulging part 4. Never.

In this way, you can use medium denier thread as well as
Even fine denier threads can be reliably held within the deep slit 2b by the bulge 4. Furthermore, since a plurality of recesses 3 are provided, the effect is even greater. Furthermore, by arbitrarily selecting the shape (circular, rectangular, triangular, etc.), size, number, etc. of the recesses depending on the thinness, strength, elongation, etc. of the thread to be wound, even greater effects can be achieved. is obtained.

4 and 5 show another embodiment,
The bulges 4 face each other and are in contact with each other at the bulges 4. The manufacturing method for this product may be the same as that described above, except that the arrangement of the bulging portion 4 is simply changed.

As described above, the recesses 3 are preferably arranged in a staggered arrangement (FIG. 1) or symmetrically arranged (FIG. 4) with respect to the grooves 2 in order to equalize stress, but they may also be arranged on one side. When providing the recess 3, it is important to note that it must be separated from the thread holding groove 2b by a wall. This is because if the recess 3 is formed directly in the thread holding groove 2b, single thread cracking, single thread breakage, and thread breakage will occur.

〔Effect of the invention〕

The method for manufacturing a bobbin for thread winding according to the present invention involves forming a concave portion on the outside of one or more portions of the thread holding groove in order to bulge the surface portion of the thread holding groove. It is possible to prevent the held thread from escaping again due to tension, and it is now possible to reliably wind up threads as thin as 30 denier onto the bobbin, which was previously difficult to grip. Summer.

[Brief explanation of the drawing]

FIG. 1 is a plan development view of a bobbin for thread winding according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line A-A,
3 is a sectional view taken along the line B-B, and FIG. 4 is a plan development view of a bobbin for thread winding according to another embodiment, and a fifth
The figure is a sectional view taken along the line C-C. 1... bobbin for thread winding, 2... groove for thread guidance and thread holding, 3... recessed portion, 4... bulged portion.

Claims (1)

[Claims] 1. A step of providing a gently sloped thread guide groove and a narrow V-shaped thread holding groove along the circumferential direction of the end of the bobbin, and a step in which a surface portion of the holding groove locally expands into the holding groove. A method for manufacturing a bobbin for thread winding, comprising the step of pressing the outside of the holding groove so as to form a recess so as to come into contact with the opposing side wall.