JPS637193Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a base frame for a bobbin for a sewing machine, and more specifically, the present invention relates to a base frame attached to the lower end of a bobbin wound with thread, which is attached to a spindle protruding from the upper side of the body of a sewing machine. It is related to.

A sewing machine has an upper thread and a lower thread, and the upper thread is wound around a bobbin that is rotatably fitted onto a support shaft that projects above the body of the sewing machine.

When sewing with a sewing machine, the upper thread is unwound from this bobbin and sewing is performed, but when sewing is performed continuously, the thread is unwound from the bobbin at high speed, so the entire bobbin is unwound from the spindle. The result was that I was left standing.

The reason why the bobbin floats up is because the bobbin rotates at high speed. When the bobbin starts rotating at high speed, the inertia force generated by the bobbin may cause it to rotate faster than the thread being pulled out, and in this case, the thread being supplied may become slack. There was a drawback that the threads could get tangled.

The present invention was made in order to eliminate the above-mentioned drawbacks of the conventional method, and it is designed to prevent the bobbin from floating up even when the bobbin rotates at high speed, and to prevent the bobbin from rotating faster than the thread withdrawal speed. The purpose is to supply a base frame for sewing machine bobbins that can be used as a sewing machine.

Hereinafter, the present invention will be explained in detail based on embodiments shown in the drawings.

Figures 1 to 4 illustrate an embodiment of the present invention, and the reference numeral 1 in the figures is a base frame;
This base frame 1 is integrally molded from synthetic resin or the like. That is, the base frame 1 has a flat disk portion 2 and a cylindrical portion 3 protruding from the center thereof, and a ring-shaped weight 4 is integrally embedded in the lower surface of the disk portion 2 by insert molding or the like. ing.

Note that the weight 4 is not necessarily ring-shaped, and may have a structure in which a plurality of small weights formed by dividing into a predetermined shape are embedded at equal angular intervals.

On the other hand, as is clear from FIGS. 1 and 2, the cylindrical portion 3 is tapered so that the diameter becomes smaller toward the upper end.

Next, a method of using the base frame 1 configured as above will be explained.

3 and 4 explain how to use the base frame 1. In the figures, the reference numeral 5 is the body of the sewing machine, and a support shaft 6 is vertically protruded from the upper surface of the body 5. There is. A core member 7 is rotatably fitted onto this support shaft 6. This core material 7
For example, as shown in FIG. 4, it is formed as a cylindrical body with a petal-shaped cross section, and its length is approximately equal to the amount of protrusion of the support shaft 6.

This core material 7 is used to prevent the cylindrical portion 3 of the base frame 1 and the bobbin, which will be described later, from rotating in the transformed state, and has a diameter that creates a slight clearance between it and the cylindrical portion 3. In order to reduce frictional resistance, its cross-sectional shape is petal-shaped, and is designed to have a large area so as not to come into contact with the cylindrical portion 3 or the inner circumferential surface of the bobbin, which will be described later.

On the other hand, the bobbin indicated by the reference numeral 8 is formed into a cylindrical shape, and a wide material 9 is wound around the circumferential surface of the bobbin for a predetermined length. Note that the lower end of the bobbin 8 and the lower end of the wide belt 9 wound thereon are arranged to be on the same plane.

The inner diameter of this bobbin 8 is approximately equal to the outer diameter of the cylindrical portion 3.

As shown in FIG. 3, the cylindrical portion 3 of the base frame 1 is fitted into the lower end of the bobbin 8 having such a structure. At this time, since the cylindrical portion 3 has a tapered shape that becomes smaller in diameter toward the tip, the fitting is performed smoothly. When the bobbin 8 is securely fitted to the base of the cylindrical portion 3, the bobbin 8 is integrated with the base frame 1 so as not to be separated even if the bobbin 8 rotates due to the frictional resistance between the two.

In this state, the bobbin 8 is fitted on the outside of the core material 7 with the weight 4 of the base frame 1 in contact with the upper surface of the body 5 of the sewing machine.

If you start sewing in this state, even if the wide 9 is pulled out, the bottom surface of the base frame 1 is in contact with the top surface of the sewing machine body 5 along with the weight 4, so there will be frictional resistance between them and the weight of the weight 4. Therefore, a large resistance is applied to the entire bobbin 8 during rotation, and even when sewing is performed continuously, the bobbin 8 cannot be rotated at high speed due to the thread being pulled out.

Therefore, the rotation of the bobbin 8 is faster than the speed at which the yarn is drawn out, and there is no possibility of excessive yarn being supplied.Furthermore, even when the bobbin 8 rotates at high speed, the presence of the weight 4 prevents the bobbin 8 from floating. do not have.

In this way, high speed rotation and floating of the bobbin 8 are prevented, and slack due to excessive supply of yarn does not occur, and yarn entanglement and cutting accidents do not occur.

By the way, after all the threads 9 wound around the bobbin 8 have been used, the base frame 1 and the bobbin 8 can be separated and replaced with a new bobbin wound with a new thread.

In the above embodiment, the cylindrical portion 3 of the base frame 1 and the bobbin 8 are connected by fitting, but as shown in FIGS. 5 and 6, the connection is made by screwing. You may do so.

That is, if a male thread 3a is formed on the outer peripheral surface of the cylindrical portion 3 of the base frame 1, and a female thread 8a is formed on the inner peripheral surface of the lower end of the bobbin 8 to be screwed with the male thread 3a, the two can be screwed together. By doing so, the bonding state between the base frame 1 and the bobbin 8 can be made stronger.

As is clear from the above description, the present invention has a structure that includes a cylindrical part that is connected to the bobbin side and a weight that brakes the rotation of the bobbin, so it is extremely easy to attach and detach it from the bobbin. In addition, when the bobbin is rotated, the bobbin does not rotate too much and excessive supply of thread occurs, the thread does not become loose, and there is no occurrence of thread entanglement or cutting accidents. Furthermore, since the weight is embedded, even if the bobbin rotates at high speed, it will not float up at all, unlike in the conventional case.

[Brief explanation of drawings]

Figures 1 to 4 illustrate one embodiment of the present invention. Figure 1 is a perspective view of the base frame, Figure 2 is a vertical side view of the base frame, and Figure 3 is a diagram showing the structure connected to the bobbin. FIG. 4 is a perspective view of the core material, and FIGS. 5 and 6 illustrate other embodiments of the present invention. FIG. FIG. 6 is a vertical side view of the base frame. 1...Base frame, 2...Disc part, 3...Cylindrical part, 3
a...Male thread, 4...Weight, 5...Body, 6...Spindle, 7...Core material, 8...Bobbin, 8
a...Female thread, 9...Upper thread.

Claims (1)

[Claims for Utility Model Registration] (1) It is integrally molded from synthetic resin, and has a disc part 2 and a cylindrical part 3 that is integrally molded on the upper surface of this disc part 2 and is connected to the bobbin 8 side. A base frame for a sewing machine bobbin, characterized in that a weight 4 is embedded in the bottom surface. (2) The base frame for a bobbin of a sewing machine according to claim 1, wherein the cylindrical portion 3 is formed in a tapered shape so that it can be easily fitted onto the bobbin 8. (3) The outer circumferential surface of the cylindrical portion 3 has a male thread 3 that is screwed into the female thread 8a formed on the inner circumferential surface of the lower end of the bobbin 8.
The base frame for a bobbin of a sewing machine according to claim 1 of the claimed utility model registration, characterized in that a.