JPS5810116B2 - bobbin case - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bobbin case for a sewing machine, and more particularly to the structure of a receptacle for fitting a bobbin case into an inner bobbin case.

Referring to FIGS. 1 and 2, a bobbin case 1 of a sewing machine stores a bobbin (not shown) wound with bobbin thread, and is fitted onto a stud 3 of an inner hook 2 with the same axis line. Ru.

Referring to FIG. 3 showing an exploded view of the bobbin case 1, a fitting portion 6 that fits into a recess 5 formed at the free end of the stud 3
The latch 7 is mounted so as to be movable along guide grooves 8 and 9 formed opposite to each other on both sides of the radial line of the main body 4.

A knob 11 is pivotally supported by a hinge pin 10 at one end of the latch I in the direction of movement along the guide grooves 8 and 9.

A spring 12 is inserted into the guide groove 9, and the latch 7 is biased by the spring force of the spring 12 in a direction in which the fitting portion 6 is fitted into the recess 5.

The movement of the latch 7 along the guide grooves 8 and 9 is caused by the support portion 11a of the knob 11 coming into contact with the hole 13 formed in the upper part of the main body 4, and the screw 14 screwed into the latch 7 being inserted into the main body 4.
is restricted by abutting the hole 15 of.

When fitting the bobbin case 1 into the inner hook 2, the cylindrical portion 16 formed concentrically on the main body 4 of the bobbin case 1 is inserted into the stud 3 of the inner hook 2 as shown in Fig. 4. .

At this time, the latch 7 is resiliently biased in the direction of the arrow 17 in FIG. 4 by the spring force of the spring 12 shown in FIG. 3 mentioned above.

When the bobbin case 1 is further pushed in from the state shown in FIG. 4, the latch 7 is displaced in the opposite direction of the arrow 17 against the elastic force of the spring 12, returning to the state shown in FIG.

FIG. 5 shows a state immediately before the fitting part 6 of the latch 7 fits into the recess 5 of the stud 3, and the support part 11 of the knob 11 is shown in FIG.
The cam surface 18 formed at a is separated from the main body 4,
The knob 11 is rotatable around the hinge pin 10 from the position shown by the solid line to the position shown upward by the imaginary line.

In this state, the inner hook 2 and the main body 4 of the bobbin case 1 are not in contact with each other.

When the bobbin case 1 is further pushed in from the state shown in FIG. As a result, the fitting part 6 is fitted into the recess 5 of the stud 3 as shown in FIG. 6, and fitting of the bobbin case 1 into the inner hook 2 is achieved. Ru.

Referring to FIG. 6 after the fitting is completed, a gap t is inevitably created between the free end side of the recess 5 of the stud 3 and the fitting portion 6 of the latch 7 due to processing.

Due to the gap t, the bobbin case 1 wobbles along the stud 3 of the inner pot 2.

In particular, in the case of a vertical full-rotation hook used for zigzag stitches as shown in Figures 1 to 6, if such rattling occurs along the axis of the bobbin case 1, it may cause problems when sewing buttonholes. There is a possibility that the standing parts may not be formed in a straight line.

Therefore, an object of the present invention is to provide a bobbin case that can be fitted into an inner hook while suppressing rattling in the axial direction.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

7 is a sectional view corresponding to the above-mentioned FIG. 4 of an embodiment of the present invention, FIG. 8 is a plan view of FIG. 7 with the inner pot 2 omitted, and FIG. It is a sectional view taken along the section line IX-IX in the figure, and parts corresponding to the prior art in FIGS. 1 to 6 are given the same reference numerals.

The spring 12 of the latch 20 is attached to the fitting portion 24 that should fit into the recess 5 of the stud 3 of the latch 20 of the bobbin case 19.
A wedge surface 21 is formed which slopes toward the proximal end of the stud 3 in the resilient biasing direction 17 .

Width d of the guide grooves 22 and 23 along the axis of the bobbin case 19
1 is chosen more than the thickness d2 of the latch 20.

Other parts are constructed in the same manner as the prior art shown in FIGS. 1 to 6.

To fit the bobbin case 19 configured in this way into the inner hook 2, fit the cylindrical portion 16 into the stud 3 of the inner hook 2 as shown in FIG. From this state, push the stud 3 toward the proximal end side.

Then, the fitting part 24 of the latch 20 is pushed in while contacting the spherical head 25 formed at the free end of the stud 3, so that the latch 20 resists the spring force of the spring 12 and is pushed into the arrow position. 17 and is displaced in the opposite direction.

FIG. 10 is a sectional view showing a state immediately before the wedge surface 21 comes into contact with the free end side of the recess 5 while the bobbin case 19 is being pushed in from the state shown in FIG.

In this state, the cam surface 18 of the knob 11 is separated from the main body 4, and the knob 11 moves between the position shown by the solid line in FIG.
It can be rotated freely around.

When the bobbin case 19 is further pushed in from the state shown in FIG. The fitting part 24 is in the recess 5 of the stud 3
Get stuck in.

This state is shown in FIG.

In the state shown in FIG. 11, the cam surface 18 of the knob 11 comes into contact with the main body 4, and the latch 20
is spring biased in the direction of arrow 17, so latch 2
The end 20a of the hinge pin 10 is pushed up in the direction of the arrow 26.

Thereby, the wedge surface 21 is elastically pressed against the free end side of the recess 5 of the stud 3 along the axis of the stud 3.

In the state shown in FIG. 11, the hinge pin 10 of the latch 20
When the side end 20a is pushed up in the direction of the arrow 25,
By the time the wedge surface 21 comes into contact with the free end side of the recess 5, the end 20a of the latch 20 on the hinge pin 10 side is in the guide groove 22,
23 upper surface 22a.

23a (see FIG. 9) must be avoided.

That is, referring to FIG. 9, the difference d3 between the width d1 of the guide grooves 22 and 23 and the thickness d2 of the latch 20 is determined by the difference d3 between the width d1 of the guide grooves 22 and 23 and the thickness d2 of the latch 20. It is selected to such an extent that the cam surface 18 and the main body 4 can be brought into contact at the same time.

With this configuration, when the bobbin case 19 is fitted into the inner hook 2, the wedge surface 2 is formed as shown in FIG.
1 is elastically pressed against the free end side of the recess 5 of the stud 3q, so that the bobbin case 19 does not wobble in the axial direction.

As another embodiment of the present invention, instead of forming the wedge surface 21 on the fitting part 24 of the latch 20, a wedge surface 27 is formed on the free end side of the recess 5 of the stud 3 as shown in FIG. It's okay.

As described above, according to the present invention, when the bobbin case is fitted into the inner case, the fitting portion of the latch of the bobbin case and the free end side of the recess of the stud are elastically connected to each other in the axial direction of the stud. In addition, a wedge surface was formed on either the fitting part of the latch or the free end side of the recess of the stud, so that when the bobbin case was fitted into the inner case, the axis of the bobbin case It can prevent shaking in the direction.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing a conventional bobbin case 1 and inner hook 2, Figure 2 is a front view showing the bobbin case 1 fitted into the inner hook 2, and Figure 3 is a bobbin case 1. 4, 5, and 6 are sectional views showing the process of fitting the bobbin case 1 into the inner hook 2, and FIG. 7 is a sectional view of an embodiment of the present invention, Figure 8 is the inner pot 2 of Figure 7.
Figure 9 is a plan view with the area omitted, taken along the cutting plane line IX-IX in Figure 8.
10 and 11 are sectional views showing the process of fitting the bobbin case 19 into the inner hook 2, and FIG. 12 is a front view of the vicinity of the stud 3 of another embodiment of the present invention. It is a diagram. 2...Inner pot, 3...Stud, 4...Body, 5
... recess, 10.. pin, 11.. knob,
12...Spring, 19...Bobbin case, 20...
Latch, 21°27...Wedge surface, 22.23...
Guide groove, 24... fitting part.

Claims (1)

[Claims] 1 The latch is elastically biased along the guide groove formed in the bobbin case body, and the fitting part of the latch fits into the recess formed in the free end of the stud of the inner case, and the latch In the bobbin case, a cam surface of a knob pivotally supported at an end in a direction opposite to the resilient biasing direction contacts the main body so that the knob is pressed against the latch. A wedge surface is formed on either one of the free end sides of the recess of the stud, and the fitting portion of the latch and the free end side of the recess of the stud resiliently abut each other in the axial direction of the stud. A bobbin case characterized by: