JPH0435334Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention is a paper bobbin for winding a thread (double paper tube) consisting of an outer paper tube and an inner paper tube that is press-fitted into the outer paper tube.
It is related to.

(b) Prior Art A paper bobbin is rotated by a spindle during stretching and twisting, and is used as a core material when winding yarn.

Conventionally, there are various types of paper bobbins, but cylindrical ones are generally used, and by bending both ends, the strength of the opening is increased and the thread can be smoothly separated when taking the thread. The ends are rounded to allow for easy handling.

However, even if the strength of the opening end is ensured, the strength of the cylindrical part itself, which is the main body of the paper bobbin, is weak, and there have been cases where it cannot withstand the tension of the thread when the thread is wound up. For example, considerable strength is required when winding extremely thin stretchable synthetic fibers used in women's stockings. Therefore, paper bobbins have been made thicker to maintain strength, and double paper tubes have been developed in which an inner paper tube is press-fitted into an outer paper tube.

(c) Problems that the invention aims to solve However, with the thick paper that forms the paper bobbin, it is impossible or extremely difficult to bend the ends to form a rounded part. . Therefore, the inner periphery of the end was scraped off to make it thinner and then bent.

In addition, in conventional double paper tubes, the common method was to apply adhesive to the inner paper tube and fix it with adhesive, but the adhesive application process was time-consuming and
Additionally, there were drawbacks such as the adhesive penetrating into unnecessary areas.

Furthermore, there are cases where embossed textured paper is pasted, or rubber rings etc. are fitted and then press-fitted.
However, it lacked hardness, resulting in insufficient friction and was extremely difficult to fit.

In other words, in these methods, in order to securely fix the outer paper tube and the inner paper tube, not only the gap between the outer paper tube and the inner paper tube is made as small as possible, but also the inner paper tube It is necessary that the outermost diameter of the paper tube (in the case of an embossed paper tube, the outer diameter of the convex portion) overlaps with the inner diameter of the outer paper tube. Otherwise, there would be no friction and the fit would not be strong.

If the degree of this overlap is large, it becomes difficult to fit in, and the two become mutually inconsistent.

Therefore, there has been a demand in the industry for a double paper tube that does not require adhesive, is easy to fit, and has a strong fit.

(d) Means for solving the problem The inventor has completed the present invention as a result of intensive research in view of the above points, and its characteristics are It consists of an inner paper tube that is press-fitted into a paper tube, and a thread-like body is spirally protruded from the circumferential surface of the inner paper tube.

The threads mentioned here include not only normal threads but also paper,
This includes all thread-like materials such as rubber, wire, or synthetic resin.

The term "spiral" means excluding a ring shape perpendicular to the longitudinal direction of the paper tube, and does not mean only a spiral shape in mathematical terms. That is, the term also includes a ring in which the ring is protruded obliquely in the longitudinal direction of the paper tube. Although this kind of construction is extremely time-consuming, it is not something that should be eliminated.

Furthermore, the shape of the spiral does not need to be constant, but may vary or may be random.

Protruding means that the outer diameter of the part where the filament is wound is larger than the outer diameter of the other parts, and even if there is no filament in the outermost layer, the outer diameter of that part becomes larger. Bye. That is, it is possible to further wind the roll paper after winding the filament. This protrusion may or may not be made using adhesive.

Furthermore, the filament may be one in which a liquid synthetic resin is extended onto the surface of the inner paper tube and solidified into a filament. In this case, there is an advantage that the thickness and hardness of the filament can be adjusted freely. In this example, the thread does not have to be continuous, but may be extended intermittently.

Further, the thread-like body may be provided with one thread or a plurality of threads, and may be appropriately selected depending on the hardness of the thread-like member and the like.

(e) Effect Due to the structure of the present invention, in which the filamentous body is spirally protruded, the filamentous body is only on one side of the inner paper tube at the initial stage of biting the inner paper tube into the outer paper tube. Since there are only a few, it is extremely easy to get caught. Then, at the stage of complete press-fitting, the filamentous body exists over the entire circumference of the inner paper tube, so that the two can be firmly fixed.

(f) Embodiment FIG. 1 shows an embodiment of the present invention, in which a filament 3 is spirally wound around an inner paper tube 2 constituting a paper bobbin 1. A filamentous body 3 is provided protruding from the top. The figure shows a cross section of the outer paper tube 6, but not the inner paper tube 2. This can be seen because the filamentous body 3 protrudes and bites into the outer paper tube 6. Due to this bite,
This creates a large amount of resistance and ensures a strong fit.

In addition, the bent portion 7 that forms a rounded portion at the end is
In this embodiment, they are provided at both ends of the outer paper tube 6, but they may be provided at the inner paper tube 2, or at opposite ends of both. Generally, paper tubes are
Roll paper 4 is stacked many times. Each roll paper 4 is adhesively fixed by applying an adhesive 5 to form a paper tube.

Therefore, as shown in FIG. 2, winding the filament 3 can be done in the same way as winding the roll paper 4 in a spiral shape. That is, by interposing the filamentous body 3 between a plurality of roll papers 4 lined up, the filamentous body 3 is automatically wound.

In this case, since the filamentous body 3 is wound around the upper surface of the roll paper 4 coated with the adhesive 5, the filamentous body 3 can be supported. After the filamentous body 3 is wound, another roll paper 4 is further wound from the upper surface thereof, so that the filamentous body 3 can be more firmly fixed.

In order to press-fit the inner paper tube 2 with the filament 3 protruding from the outer circumferential surface into the outer paper tube 6, the thread-like body 3 must be placed on one side at the biting stage as shown in FIG. This makes insertion extremely easy.

Further, the filament 3 is wound around a roll paper 4 coated with an adhesive 5, and further wrapped with a roll paper 4 to cover it, but it may be wound with this exposed. . Of course, in this case, since the adhesive 5 is not applied to the roll paper 4 on which the filamentous body 3 is wound, the adhesive 5 may be applied to the filamentous body 3 itself.

In addition, Fig. 4 shows how liquid synthetic resin is applied to the inner paper tube 2.
This shows an example in which the fibers are extended onto the surface of the fiber and solidified into a filament.

(g) Effect of the invention As described above, the paper bobbin according to the invention has a filament spirally protruding from the surface of the inner paper tube, so it is extremely difficult to press fit into the outer paper tube. Not only is it simple, but the fixing of the outer paper tube and inner paper tube after press-fitting is extremely strong, and has the same strength as a conventional double-walled paper tube or thick-walled paper tube fixed with adhesive, or even more. It has the strength of

Furthermore, compared to conventional methods, there is no process of applying adhesive or scraping off the inner peripheral surface of the opening end, and the filament can be provided at the stage of manufacturing the paper tube, which reduces work efficiency. Moreover, it has extremely beneficial effects such as being able to be manufactured at low cost.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional side view showing an embodiment of a paper bobbin according to the present invention, Fig. 2 is a plan view showing a state in which a filament is provided, and Fig. 3 shows an inner paper tube connected to an outer tube. FIG. 4 is a partially sectional side view showing a state in which the filament is inserted into a paper tube, and FIG. 4 is a side view showing another embodiment of the filament. DESCRIPTION OF SYMBOLS 1... Paper bobbin, 2... Inner paper tube, 3... Thread-like body, 4... Roll paper, 5... Adhesive, 6... Outer paper tube, 7... Bent part.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. Consisting of an outer paper tube and an inner paper tube that is press-fitted into the outer paper tube, the inner paper tube has thread-shaped bodies protruding in a spiral shape on the peripheral surface of the inner paper tube. A paper bobbin characterized in that the surface is covered with rolled paper. 2. The paper bobbin according to claim 1, wherein the outer paper tube has at least one end bent inward to form a bent part. 3. The paper bobbin according to claim 1, wherein the inner paper tube has at least one end bent inward to form a bent part.