JPH0340850Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a bobbin with a thread stopper used in industrial sewing machines, household sewing machines, and the like.

(Prior art and problems) Conventionally, in order to stop the end of a thread wound on a bobbin, a synthetic resin cap such as polypropylene is placed over the end of the bobbin, and the end of the thread is sandwiched between these caps. This was done using methods such as: Manufacturing a cap to be attached to the end of a bobbin solely for the purpose of stopping the end of the thread has the disadvantage of increasing the number of parts and manufacturing steps, increasing the cost of the bobbin.

Furthermore, there is conventionally a spool in which a notch (thread stopper) is formed by making a cut so as to form a V-shaped groove (Japanese Patent Application Laid-Open No. 48-42135).

However, there is a problem in that forming this notch requires a cutting process to insert the notch after forming the spool.

There is also a thread winder that has a hook groove for holding the thread (Japanese Utility Model Publication No. 35-8248).

However, when attempting to integrally mold a bobbin with a latching groove with a mold, the part that will become the latching groove becomes a thin convex mold, and furthermore, the tip of this convex mold is in contact with the opposing mold. There is a problem in that the bobbin becomes worn out, the thread cannot be stopped, the life of the mold is shortened, the mold has to be repaired and replaced many times, and the price of the bobbin increases.

(Means for Solving the Problems) The present invention provides a bobbin in which a thin-walled cylindrical portion having shape-retaining properties is formed at the end of the bobbin. A cut recess is provided in a substantially perpendicular direction from the top surface of the shaped part, and a thin film that can be cut by the tension of the thread is integrally formed between both side walls of the cut recess. It's a bobbin.

The cut recess is a recess formed in a substantially perpendicular direction from the top surface, and preferably becomes gradually narrower as it goes inward.

The two side walls of the cut recess are the opposing surfaces forming the cut recess.

The term "cutting is possible due to the tension of the thread" means that when you hold the end of a thread wound on a bobbin and press the middle of the thread against a thin film, the thin film can be cut by the tension generated in the thread. say.

The thin film is integrally formed between both side walls of the notch recess, which means that the thin film is formed so as to close the space between the opposing surfaces that make up the notch recess, and is integrally formed. means.

(Function) A cut recess is provided at the end of the bobbin in a direction substantially perpendicular to the top surface of the thin-walled cylindrical portion, and a thin film that can be cut by the tension of the thread is integrally formed between both side walls of the cut recess. Due to this structure, the thread can be stopped by cutting the end of the thread wound around the bobbin into the thin film.

(Example) An embodiment of the present invention will be explained with reference to the drawings.

FIG. 1 is a front view of the bobbin 1, where 1a is a thread winding portion and 1b is a flange. A bobbin is constituted by the thread winding portion 1a and the flange 1b.

The flange 1b has a central portion 24 recessed in the axial direction except for an outer peripheral portion 23, and the outer peripheral portion 23 is formed into a thin-walled cylindrical portion having shape-retaining properties. The thin-walled cylindrical portion is not limited to a cylinder, and may be expanded. The flange 1b has a tapered surface 3 on the inner side of the boundary 4, and a thread stopper is formed on the bobbin end 2 on the outer side of the boundary 4.

A cut recess 5 is formed in the bobbin end portion 2, which is a thin-walled cylindrical portion, in a direction perpendicular to the top surface of the thin-walled cylindrical portion. The cut recess 5 gradually narrows inward from the top surface and appears in a triangular shape on the front of the bobbin 1.

The cut recess 5 is formed between the bobbin end 2 and the tapered surface 3.
2 on the front side with a depth that reaches the boundary 4 with the
Two are placed close to each other on the back side.

When the notch recess 5 is viewed from the end surface of the bobbin 1 (see FIG. 2), it is formed into a substantially trapezoidal shape that expands toward the center.

A thin film 7 is formed integrally with the bobbin 1 between both side walls 9 of the notch recess 5 at a position corresponding to the outer peripheral side 20 of the substantially trapezoidal shape.

The thin film 7 is formed to have a thickness of 0.05 mm to 0.1 mm.

A guide slope 8 for guiding the yarn is formed on each side of the cut recess 5 on the top surface 6.

12 is a threading part for threading the thread; threading part 1;
Both circumferential sides of 2 are guide stop surfaces 13 that guide the thread to the thin film.

The bobbin 1 in the example is made of polypropylene.

To stop the end of the thread, while cutting the thin film 7 with the end thread, press the end thread toward the back 21 of the cut recess 5 and pinch it.

Reference numeral 11 in FIG. 6 is a score line cut by the thread 10. In this cut state,
The terminal thread is held by the membrane 7 within the cut recess 5.

When guiding the thread to the cutting recess 5, the thread is slid on the guide slope 8 of the top surface 6 and hits the guide stop surface 13 to cut into the thin film 7, thereby making the thread fixing work easier.

Fig. 8 shows a state in which thread is wound around the bobbin of the present invention, and Fig. 9 is a perspective view of the thread stopper portion as seen diagonally from above. FIG. 10 is a perspective view of the thread stopper portion as seen diagonally from above.
In FIG. 10, the thread on the right side is in a state where cutting into the thin film has started, and the thread on the left side is in a state where cutting has started into the thin film.

According to the experimental results conducted on threads of various thicknesses,
A film thickness in the range of 0.05 mm to 0.1 mm was favorable.

In order to secure the thread, it is sufficient to make only one notch 5, but just to be sure, one terminal thread is sandwiched between two adjacent notches 5.

(Effect of the invention) In the present invention, a cut recess is provided in a substantially perpendicular direction from the top surface of a thin-walled cylindrical portion formed at the end of the bobbin, and a cut is made between both side walls of the cut recess by the tension of the thread. Since the thin film is integrally formed, there are fewer parts and it is possible to securely stop not only thick threads but also thin threads.

That is, at the end of the bobbin, a cut recess is formed in a direction substantially perpendicular to the top surface of the thin-walled cylindrical portion, and a thin film is formed in this cut recess. It can be fastened by pinching it while cutting, and there is no need for a separate cap for thread fastening.Furthermore, since the thin film is formed integrally, there is no need for a separate process for forming thread fastening.

What's more, since the thin film is cut into and fastened, it is possible to fasten both thick and thin threads.

Furthermore, since the molding process leaves a thin film behind, there is almost no wear on the mold, making it possible to mold the mold many times.
The life of the mold can be extended, and maintenance is easy.

[Brief explanation of the drawing]

Figure 1 is a front view showing one embodiment of the present invention;
The figure is the same plan view, Figure 3 is an enlarged view of the main part of Figure 1, Figure 4 is the same plane view, Figure 5 is an enlarged sectional view of the cut recess, and Figure 6 shows the state in which the thread is cut into the thin film. FIG. 3 is an enlarged view of part A, FIG. 7 is a sectional view taken along the - line, FIG. 8 is a perspective view showing the bobbin with thread wound thereon, and FIGS. 9 and 10 are perspective views of the thread stopper. It is. 1... Bobbin, 5... Cut recess, 7... Thin film, 8... Guide slope, 11... Cut line.

Claims (1)

[Claims for Utility Model Registration] (1) In a bobbin in which a thin-walled cylindrical portion having shape retention properties is formed at the end of the bobbin, the thin-walled cylindrical portion A bobbin with a thread stopper, characterized in that a cut recess is provided in a substantially vertical direction from the top surface, and a thin film that can be cut by thread tension is integrally formed between both side walls of the cut recess. (2) The bobbin with a thread stopper according to claim 1, wherein both side walls of the cut recess are formed so as to gradually become narrower in a substantially vertical direction from the top surface of the bobbin end. (3) The bobbin with a thread stopper according to claim 1 or 2 of the utility model registration claim, wherein the thin film has a thickness in the range of 0.05 mm to 0.1 mm.