JPH0317516B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a full rotary hook that can be suitably implemented in lockstitch sewing machines and the like.

Prior Art FIG. 5 shows a typical prior art bobbin case 1.
FIG. In a vertical full-rotation hook provided in a lockstitch sewing machine, an inner hook is fitted into and supported by an outer hook that is driven to rotate around a horizontal axis of rotation. This inner hook has a bobbin case 1
is removably attached, and inside the bobbin case 1,
A bobbin with bobbin thread wound therein is stored.

The bobbin case 1 has a peripheral wall 2 having a substantially right cylindrical shape.
and an end plate 3 that closes one end of the peripheral wall 2. A groove 4 is formed in the end plate 3, and a latch 5 is disposed in the groove 4. A knob piece 7 is connected to the latch 5 by a hinge pin 6. The latch 5 is spring biased by a compression coil spring 9 housed in a spring housing hole 8 formed in the end plate 3.

When the bobbin case 1 is attached to the inner hook, as shown in FIG. By pushing the bobbin case 1 in along the direction, the engaging part 14 of the latch 5 comes into contact with the half-moon part 15 of the stud 13 and is pressed to the left side in the figure, and the latch 5 is pressed against the helical compression spring 9. The bobbin case 1 is fitted into the inner hook while being displaced against the spring force. When the engaging part 14 of the latch 5 passes through the half-moon part 15 of the stud 13 and reaches the state where it faces the engaging groove 16 formed around the entire circumferential direction of the stud 13, as shown in FIG. Since the latch 5 is pressed rightward by the spring force of the compression coil spring 9, the engaging portion 14 fits into the engaging groove 16.
Such movement of the latch 5 to the right side is stopped by the cam portion 17 of the knob piece 7 coming into contact with an abutment portion 18 formed on the end plate 3 of the bobbin case 1.

When the bobbin case 1 is taken out from the inner hook 12, the knob piece 7 is pulled in a direction away from the latch 5 to angularly displace it around the axis of the hinge pin 6, as shown in FIG. At this time, the cam part 17 of the knob piece 7 is in contact with and supported by the abutting part 18, and the latch 5 moves to the left via the hinge pin 6, and the engaging part 14 engages with the half-moon part 15. The bobbin case 1 is configured to be able to be taken out from the inner hook 12 when it is moved away from the matching groove 16 and to the outside of the half-moon portion 15 .

Problems to be Solved by the Invention In such prior art, the structure of the bobbin case 1 is complicated and has a large number of parts, which not only requires time and effort to assemble, but also increases manufacturing costs. Also, when replacing the bobbin,
In the relatively narrow space under the sewing machine bed,
It is necessary to operate the bobbin case 1 to take it out from the inner hook 12, and it is preferable that the work of attaching and detaching the bobbin case 1 in such a narrow space can be performed more easily.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a full-rotation hook that has a simple structure, can be easily attached to and removed from the inner hook of a bobbin, and can be manufactured at low cost by reducing the number of parts. That's true.

Means for Solving the Problems The present invention provides an inner hook 20 in which a bobbin 30 is stored.
A pair of fitting recesses 25a, 25 symmetrical with respect to a plane containing the axis l1 of the inner hook 20 is provided at the open end of the inner hook 20.
b is formed and extends between each of the fitting recesses 25a, 25b, and a holding part 28 that is bent approximately perpendicularly to both ends of the holding part 28 in the longitudinal direction and is connected to each of the fitting recesses 25a, 2.
5b, and has a pair of fitting parts 29a and 29b made of permanent magnets.
There is a full-rotation hook characterized in that the inner hook 20 is removably attached to the inner hook 20.

Effects According to the present invention, since the holding member is detachably attached to the inner hook by magnetic attraction, the bobbin can be replaced quickly and easily. Further, by using the holding member, the conventional bobbin case is not required, the number of parts is reduced, and manufacturing costs can be reduced.

In particular, in the present invention, since a pair of fitting portions made of permanent magnets are provided at both ends in the longitudinal direction of the holding portion of the holding member, the flange on the open end side of the bobbin housed in the inner hook is fitted into the fitting portion. The bobbin can be taken out from the inner pot together with the holding member while being magnetically attracted by the joint, and thereby the bobbin can be replaced quickly and easily.

Embodiment FIG. 1 is a perspective view of an inner hook 20 according to an embodiment of the present invention, and FIG. 2 is a perspective view of the inner hook 20 shown in FIG. 1.
FIG. The inner hook 20 provided in the vertical full-rotation hook includes a generally right cylindrical peripheral wall 21, a bottom portion 22 formed to close one end of the peripheral wall 21, and a side opposite to the bottom portion 22 of the peripheral wall 21. It has a flange 23 formed at the end of the flange. A stud 24 is provided on the bottom portion 22 in an upright manner toward the open end side. Further, the peripheral wall 21 is provided with the inner hook 20 on both sides in the diametrical direction intersecting the axis l1 of the inner hook 20, that is, at the open end of the inner hook 20.
A pair of fitting recesses 25a and 25b are formed symmetrically with respect to a plane including the axis l1 of the.

A holding member 26 is attached to such an inner pot 20. The holding member 26 includes a cylindrical portion 27 into which the stud 24 is inserted, a holder 28 to which one end of the cylindrical portion 27 is fixed, and a pair of bobbins 30 erected at the longitudinal center of the holder 28. flange 50
a, 50b (see Figure 3)
The cylindrical portion 27 is inserted into the cylindrical portion 27, and a pair of fitting portions 29a, 2 which are bent approximately vertically at both longitudinal ends of the holding portion 28 and protrude in a row in the direction in which the cylindrical portion 27 extends.
9b. Each fitting portion 29a, 29b is made of a permanent magnet, and the fitting recess 25 of the inner hook 20
It fits into a and 25b and is magnetically attracted. Further, a stud 24 is fitted into the cylindrical portion 27 to position the holding member 26 with respect to the inner hook 20. When the holding member 26 is attached to the inner hook 20 in which the bobbin 30 is housed in this manner, the fitting portion 29
a, 29b magnetically attracts the flange 50a of the bobbin 30 disposed on the open end side of the inner hook, and from the state in which the holding member 26 is attached, hold the holding member 26 with your fingers or the like to remove the inner hook 20. When removed upward in the direction of axis l1, that is, upward in Fig. 3,
The open end flange 50a of the bobbin 30, which is magnetically attracted by the fitting portions 29a and 29b, is pulled out from the inner pot 20 while being magnetically attracted to the fitting portions 29a and 29b. By pulling out the holding member 26 from the inner hook 20, the bobbin 30 can be taken out from the inner hook 20 together with the holding member 26.

FIG. 3 is a sectional view showing a state in which the bobbin 30 is held within the inner hook 20 by the holding member 26. When attaching the bobbin 30 to the inner hook 20, first attach the cylindrical portion 27 of the holding member 26 to the bobbin 30.
Insert the stud 24 of the inner hook 20 into the cylindrical portion 27 in a state in which the holding member 26 is inserted into the winding trunk 31 of the inner hook 20, and in this state, the holding member 26 is is pressed toward the bottom 22 side. In this way, the fitting parts 29a and 29b are connected to the fitting recess 2.
The bobbin 30 is held in the inner hook 20 by being magnetically attracted to the inner hook 5a and 25b. Therefore, unlike the prior art, there is no need to use a bobbin case with a relatively complicated structure, and the bobbin 30 can be reliably held within the inner hook 20 by the holding member 26.

Further, when removing the bobbin 30 of the inner hook 20, it is only necessary to pull out the holding member with a force slightly greater than the magnetic attraction force of the fitting parts 29a and 29b, and therefore the bobbin 30 can be removed easily. . Therefore, it becomes easy to replace the bobbin 30, and the bobbin can be replaced quickly without taking an undesirably long time.

FIG. 4 shows a holding member 40 according to another embodiment of the present invention.
FIG. In the embodiment described above, the holding part 28
Although the cylindrical portion 27 through which the stud 24 is inserted is provided in the holding portion 28, in this embodiment, an insertion hole 41 through which the stud 24 is inserted is provided in the holding portion 28. By using such a holding member 40, the diameter of the winding trunk 31 of the bobbin 30 can be reduced, thereby increasing the amount of winding of the bobbin thread around the bobbin 30. Can be done.

Effects of the Invention According to the present invention, since the bobbin is held in the inner hook by the holding member, the bobbin can be replaced quickly and easily. Further, by using the holding member, a conventional bobbin case is not required, the number of parts is reduced, and manufacturing costs can be reduced.

In particular, in the present invention, a pair of fitting parts made of permanent magnets are provided at both longitudinal ends of the holding part of the holding member, so that when the bobbin is housed in the inner hook, the holding member is When installed in the hook, each of the fitting portions is in close proximity to the flange on the open end side of the bobbin in the inner hook, and therefore magnetically attracts the flange on the open end side. Can be done. In this state, by pulling out the holding member from the inner hook, the bobbin can be taken out from inside the inner hook together with the holding member, and the work of attaching and removing the bobbin to and from the inner hook can be done easily and quickly. can.

[Brief explanation of the drawing]

1 is a perspective view of an inner hook 20 according to an embodiment of the present invention, FIG. 2 is a perspective view of a holding member 26, and FIG. 3 is a perspective view of a bobbin 30 held in the inner hook 20 by the holding member 26. 4 is a perspective view of a holding member 40 according to another embodiment of the present invention; FIG. 5 is an exploded perspective view of a typical prior art bobbin case 1;
FIG. 6 is a diagram for explaining the mounting operation of the bobbin case 1. 20... Inner hook, 21... Peripheral wall, 22... Bottom, 23... Flange, 24... Stud, 25a,
25b... Fitting recess, 26, 40... Holding member,
29a, 29b...fitting portions.

Claims (1)

[Scope of Claims] 1. A pair of fitting recesses 25a and 25b are formed at the open end of the inner hook 20 in which the bobbin 30 is housed, which are symmetrical with respect to a plane containing the axis l1 of the inner hook 20, A holding part 28 extends between the fitting recesses 25a and 25b, and a holding part 28 extends approximately perpendicularly to both longitudinal ends of the holding part 28, and each fitting recess 25a and 2
5b, and has a pair of fitting parts 29a and 29b made of permanent magnets.
A full-rotation hook, characterized in that the inner hook 20 is removably provided with the following.