JPH0214269B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a method for manufacturing a yarn winding tip used for winding yarn such as filament or spun yarn.

(Technical background of the invention) This type of winding tip is as shown in FIG.
A cylindrical core bar 1 made of aluminum, Bakelite, etc., a rubber layer 2 with a uniform thickness provided on the core bar 1, and a ring-shaped slit provided at one end of the rubber layer 2. It is equipped with 3 and
In use, the starting end of a yarn, such as a spun yarn, is sandwiched between the slits 3 and wound while being held therebetween, whereby the yarn is wound continuously.

Conventionally, a winding rod having such a structure is made by directly applying unvulcanized rubber by extrusion or the like onto the core metal 1 coated with adhesive, and then vulcanizing the unvulcanized rubber. It is manufactured by creating a rubber layer 2 and making an annular cut in the rubber layer 2 to form a slit 3.

(Problems in the background art) However, if the unvulcanized rubber is simply provided on the core bar 1 and then vulcanized to create the rubber layer 2, the rubber layer 2 vulcanized at high temperature will be Since it contracts at the bottom, distortion occurs in the direction of the arrow, as shown in FIG. 6A. That is, the linear expansion coefficient of the core bar 1 made of aluminum or Bakelite is 0.25×10 ^-4 and 0.3×10 ^-4 to 0.4×10 ^-4 , respectively, whereas that of the rubber layer 2 is 1.5×10 ^-4 ~ 3.0×
10 ^-4 , so the shrinkage rate of rubber layer 2 is that of core metal 1 for Kotsuto.
The shrinkage rate is approximately 4 to 10 times that of Therefore, large distortion occurs in the rubber layer 2 at room temperature. On the other hand, since the inner circumferential surface side of the rubber layer 2 is bonded to the core metal 1, shrinkage is suppressed, whereas the surface side of the rubber layer 2 gradually shrinks at room temperature due to the distortion. Therefore, as shown in FIG. 6B, when an annular slit 3 is provided in the rubber layer 2, only the surface side of the rubber layer 2 gradually contracts, so the gap between the slits 3 gradually increases, It becomes impossible to hold the winding start end of the yarn. For this reason, there was a problem in that the conventional winding method could only hold relatively thick yarns, which meant that it could only be used for very special purposes.

(Object of the Invention) An object of the present invention is to provide a method for manufacturing a yarn winding tip in which the gap between the slits does not become large.

(Summary of the Invention) The present invention provides a rubber layer by reducing the diameter of one end of the core metal in a tapered shape, and then returning the reduced diameter end of the core metal to at least the original outer diameter, and polishing the rubber layer. At the same time, a slit is formed in a portion of the rubber layer located on the reduced diameter end side.

(Embodiments of the Invention) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

First, as shown in Fig. 1, a cylindrical core bar 4 made of aluminum with an inner diameter of 94 mm and a wall thickness of 2.5 mm is prepared, and the outer peripheral surface of this core bar 4 is degreased and rough-finished. did. Then, one end side of the core bar 4 was gradually reduced in diameter by about 10 mm to form a tapered reduced diameter end 4a having an inner diameter of 92 mm.

On the other hand, a cylindrical rubber member 5 shown in FIG. 2 was prepared. This rubber member 5 is formed by vulcanizing acrylonitrile butadiene rubber, and has an inner diameter of about 99 mm. A thick protrusion 5A is provided on one end of the rubber member 5 and protrudes inward along the tapered surface of the reduced diameter end 4a of the core bar 4.

Next, the rubber member 5 is placed on the core bar 4 for the tip.
A rubber layer was provided by fitting as shown in the figure. That is,
The rubber member 5 was fitted so that the protrusion 5A was located on the reduced diameter end 4a. Then, this rubber member 5 was baked and adhered to the circumferential surface of the core bar 4.

Next, as shown in FIG.
The diameter of the reduced diameter end 4a was expanded, and one end of the core bar 4 was returned to its original inner diameter (94 mm). Therefore, as a result, the rubber end 5a of the rubber member 5 where the protrusion 5A was provided has a direction toward the other end (see arrow).
stress is occurring.

In this way, after returning one end of the core bar 4 to its original inner diameter dimension, the peripheral surface of the rubber member 5 is polished.
Form to a uniform wall thickness (outer diameter dimension) of 5 mm.

Finally, as shown in FIG. 4, an annular cut was made in the end 5a of the rubber member 5 to form a slit 3.

The obtained winding tip was attached to the rotating shaft of the winding mechanism, and the winding end of the 50 denier nylon phyllant was held between the slits 3 for 7000 to 8000 r.
pm, thereby winding up the nylon filament. Even when this winding operation was repeated, the gap between the slits 3 of the winding tip did not become large, and the slits 3 could reliably hold the winding start end of the nylon filament.

This is because stress is generated in the direction (see arrow) toward the other end at the end 5a of the rubber member 5 where the slit 3 is provided, and this stress causes the slit 3 to
This is because the gap between the two is prevented from increasing.

Note that the rubber member 5 may be formed using urethane rubber or other various rubber members, or the rubber member 5 may be formed using urethane rubber or other various rubber members.
may be fixed to the core bar 4 using an epoxy resin or urethane-based liquid adhesive.

By the way, in the above embodiment, the diameter-reduced end 4a of the core bar 4 is returned to the original inner diameter dimension, but the diameter may be expanded to a dimension larger than the original inner diameter dimension of 94 mm. In this case, it is possible to more reliably prevent the gap between the slits 3 from increasing.

In the above-mentioned embodiment, an unvulcanized rubber layer is provided on the core bar 4 for inserting via an epoxy resin, and after this rubber layer is vulcanized, the diameter-reduced end 4 of the core bar 4 for inserting
It is also possible to return a to its original inner diameter dimension, thereby generating stress in the direction of the arrow above at the end of the rubber layer.

In addition, a semi-vulcanized rubber member 5 having a protruding portion 5A is fitted onto the core bar 4 for a comb, or is baked and bonded via an epoxy resin, and then this rubber member 5 is vulcanized to form a core bar for a cotto. The reduced diameter end 4a of No. 4 may be returned to its original inner diameter dimension. In this case as well, stress is generated in the end portion 5a of the rubber member 5 in the direction of the arrow.

(Effects of the Invention) According to the present invention, one end of the core metal for combing is reduced in diameter in a tapered shape, a rubber layer having a thick wall portion is provided on the reduced diameter part, and then the reduced diameter end of the core metal for combing is provided. By returning at least the original inner diameter dimension and polishing the rubber layer to a uniform outer diameter dimension, stress is generated in the direction toward one end of the rubber layer. Therefore, even if a slit is formed on one end side of this rubber layer, the gap between the slits does not become large, and therefore, even when used repeatedly, the slit can securely hold the winding start end of the yarn. It is possible to obtain a thread winding tip that can wind even thin threads.

[Brief explanation of drawings]

Figures 1 to 4 are cross-sectional views showing each manufacturing process of the manufacturing method according to the present invention, Figure 5 is a cross-sectional view of a conventional winding tip, and Figures 6 A and B are sectional views of a cylindrical rubber layer. FIG. 3 is a cross-sectional view for explaining the distortion that occurs and the relationship between the slit gap and the distortion. 1, 4...Core metal, 3...Slit, 4a...Reduced diameter end, 5...Rubber member.

Claims (1)

[Scope of Claims] 1. A rubber having a diameter reduced at one end of a cylindrical core metal in a tapered shape, and having a thick wall portion formed on the core metal for a cylinder with a large wall thickness at the reduced diameter end. After that, the reduced diameter end of the cored bar is returned to at least the original inner diameter dimension, and the thick part is polished to make the outer diameter of the rubber layer uniform, and the reduced diameter end of the rubber layer is A method for manufacturing a yarn winding tip, characterized in that an annular cut is provided in the upper portion. 2. A patent claim characterized in that a cylindrical rubber member having a thick wall portion protruding inwardly along the diameter-reduced end is fitted on one end to provide a rubber layer on the core bar. A method for manufacturing a yarn winding cloth according to item 1. 3. An unvulcanized rubber layer is provided on the cored bar with the thick part positioned on the reduced diameter end, and the unvulcanized rubber layer is vulcanized to form a rubber layer. A method for manufacturing a yarn winding cloth according to claim 1. 4. A patent characterized in that a semi-vulcanized rubber layer is fitted onto the cored bar with the thick part positioned on the reduced diameter end, and the semi-vulcanized rubber layer is vulcanized. A method for manufacturing a yarn winding cloth according to claim 1.