JPH019506Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to the shaft hole of the shaft pin attachment part of a cloth presser foot that is detachably attached to the lower end of the presser bar of a sewing machine, and the shaft pin that is inserted into the shaft hole. It's an improvement.

(Prior art) Conventionally, when attaching a metal shaft pin to the shaft pin attachment part of a synthetic resin presser foot, the diameter of the shaft pin was made slightly larger than the diameter of the shaft hole a provided in the shaft pin attachment part. It was attached by inserting a shaft pin. (Fig. 5) Alternatively, if the diameter of the shaft pin is smaller than the diameter of shaft hole a, the shaft pin will fall out, so the
As described in Japanese Patent No. 11372, the opening end of the shaft hole was closed by heat-pressing.

(Problem that the invention attempts to solve) However, if the diameter of the shaft pin is slightly larger than the diameter of the shaft hole a provided in the shaft pin mounting part, the metal shaft pin may be pressed into the shaft hole a of the synthetic resin presser foot. If it opens and penetrates, there is a risk that the shoulder part b of the shaft pin attachment part of the presser foot will crack. When the presser foot is molded from synthetic resin, the shoulder part b of the attachment part is the point where the synthetic resin flows and joins, as shown by the arrow in Figure 5, and is also thin, so it will break if force is applied. This is because it is easy.

In addition, if the diameter of the shaft pin is smaller than the diameter of shaft hole a, the opening end of the shaft hole is heat-pressed to prevent the shaft pin from falling out, but in addition to the process of inserting the shaft into the shaft hole, the shaft hole is heat-pressed. The drawback is that it requires a process and is technically difficult to heat and press into a small shaft hole.

The present invention is designed to eliminate the above-mentioned drawbacks.

(Means for Solving the Problems) and (Operation) A head 2 enlarged into a truncated conical shape is provided at one end of the metal shaft pin 1.

A U-shaped cutout 5, which is slightly smaller than the end surface of the enlarged head 2 of the pivot pin 1, is provided at the outer end of one of the shaft pin attachment parts 4, which is opposed to the presser foot 3 made of synthetic resin. A cut groove 6 is formed on the inside, and a through hole 7 into which the shaft pin 1 can be easily inserted is provided inside the cut groove 6 and on the other shaft pin mounting portion 4, respectively.

Then, the U-shaped notch 5 is pushed open by the enlarged head 2 of the shaft pin 1, and the shaft pin 1 is inserted into the through holes 7, 7 of the shaft pin mounting portions 4, 4 provided oppositely.
The head 2 of the head 2 is fitted into the kerf 6.

(Example) The presser foot 3 is molded from synthetic resin.

The shaft pin 1 is made of metal.

The diameter of the through hole 7 is made equal to or slightly larger than the diameter m of the shaft pin 1, so that the shaft pin 1 can be easily inserted.

Note that the symbol M in FIG. 4 is the end surface of the truncated conical head 2 of the shaft pin 1.

(Effect of the invention) According to the presser foot 3 of the present invention, since the presser foot is made of synthetic resin, the U-shaped notch 5, which is slightly smaller than the end surface of the truncated conical head 2 of the shaft pin, is inserted into the metal shaft. The truncated conical head 2 of the pin 1 allows the pin 1 to be pushed open and inserted, and since it is a U-shaped notch, the shaft pin can be inserted easily without the risk of the right and left sides of the notch opening and cracking when inserted.

If the head 2 of the shaft pin 1 is fitted into the notch 6, the truncated conical head 2 will not come off because it is larger than the diameter of the U-shaped notch, and the shaft pin will not come out like in the conventional example. There is no need to heat and press the open end of the shaft hole to prevent it from falling out, and the effect is that it can be easily inserted.

[Brief explanation of the drawing]

Figure 1 is a perspective view of an embodiment of the invention, Figures 2 and 3.
The figures are an enlarged plan view and a front view of an embodiment in which a shaft pin is inserted into a presser foot, and the presser foot is shown in cross section. Fourth
The figure is a perspective view of the shaft pin, and FIG. 5 is a side view of a conventional example. 1 is a shaft pin, 2 is a truncated conical head, 3 is a presser foot, 4 is a shaft pin mounting portion, 5 is a U-shaped notch, and 6 is a cut groove.

Claims (1)

[Scope of Claim for Utility Model Registration] One end of a metal shaft pin is provided with a head enlarged in the shape of a truncated cone, and the outer end of one shaft pin mounting portion opposite to a synthetic resin presser foot, A U-shaped notch is provided that is slightly smaller than the end surface of the enlarged head of the shaft pin, a notch is formed inside the U-shaped notch, and the shaft pin is inserted into the inside of the notch and into the other shaft pin mounting portion, respectively. Then, push open the U-shaped notch with the enlarged head of the shaft pin, insert the shaft pin into the through hole of the opposing shaft pin mounting part, and insert the head of the shaft pin into the notch. Sewing machine presser foot fitted with.