JPH0718394Y2 - Zigzag sewing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a zigzag sewing machine including a threading device for inserting a thread into a needle hole of a sewing needle.

[Prior Art] In a conventional threading device for a zigzag sewing machine including a horizontal hook, when the threading hook is inserted into the needle hole with the sewing needle stopped at the left and right swing positions, the needle hole Since the sewing needle enters with the needle always facing forward, the angle at which the threading hook enters the needle hole changes, so not only can threading work not be performed reliably, but the threading hook can also be sewn. There is also a risk that both may be damaged by colliding with the needle.

Therefore, by restricting the position of the threading rod having the threading hook with respect to the needle bar, the relative positional relationship between the needle hole and the threading hook can be kept constant, and the sewing needle stops at any swing position. An attempt to surely carry out the threading work without damaging the sewing needle and the threading hook even if it is performed is disclosed in, for example, Japanese Utility Model Publication No. 60-22937.

[Problems to be solved by the invention] However, in the prior art, since the operation lever for performing the lifting operation of the threading rod is installed on the side surface portion of the sewing machine head through the operation member or the like, the threading operation is performed. There is a problem that the workability at time is poor.

That is, at the time of threading, the operation is performed while holding the thread with one hand and pushing down the operation lever for operating the threading hook with the other hand, but it is difficult to do the work because both hands are separated. .

In addition, the mechanism for maintaining the relative positional relationship between the needle hole and the threading hook constant, or the number of parts in the configuration related to the threading rod and its operating lever is increased, and a large space is required in the sewing machine head. However, there is a problem that the cost cost also increases.

[Means for Solving the Problems] The present invention has been made in order to solve the above-mentioned problems, and is a threading device that maintains a relative positional relationship between a threading hook and a needle hole of a sewing needle. In a zigzag sewing machine equipped with a device, the threading device is provided with an operating body at an upper end and a threading hook at a lower end, which is movable up and down, and is connected to a rocking base of a needle bar and driven thereby. And a main body of the threading rod support, the upper end of which is fixed to the actuating body through a slit formed in the main body. A threading operation lever pivotally supported on the lower part, and one end of a rocking plate provided at the upper end of the main body of the threading rod support is pivotally supported on the rocking base and fixed to the other end. Form a through groove that engages the pin and lower it to the appropriate position on the needle bar. By providing a positioning stopper for the locking pin of the threading rod to come into contact with, and by forming an inclined groove on the side wall of the operating body through which the upper end of the threading rod is inserted, the engaging pin of the threading rod is fitted. The present invention provides a zigzag sewing machine which is excellent in threading workability and can realize a reduction in cost and cost with a small number of parts.

[Operation] In the above-mentioned zigzag sewing machine, the main body of the threading bar support oscillates synchronously by drawing a circular arc locus similar to that of the needle bar by the oscillating plate that is driven by the oscillating table of the needle bar. The relative position between the threading rod having the threading hook and the needle bar is always kept constant.

When the threading operation lever is pushed down, the threading rod is lowered and stopped through the actuating body until the locking pin of the threading rod comes into contact with the positioning stopper of the needle bar.

At this point, the threading hook provided at the lower end of the threading rod is located at the same height as the needle hole.

Further, when the threading operation lever is pushed down, the actuating body compresses the biasing spring interposed between the threading rod and the upper end of the threading rod that is stopped and moves down. The mating engagement pin rotates a predetermined amount together with the threading rod at that height position.

Therefore, the threading hook provided at the lower end of the threading rod makes horizontal rotation, and the tip of the threading hook is inserted into the needle hole.

When the thread is engaged with the threading hook protruding from the needle hole and the threading operation lever is released, the threading hook, threading rod, actuator,
The threading operation lever or the like is returned to the original position by the process reverse to the above by the urging force of the urging spring or the like, and the threading operation is completed. [Example of the invention] Based on the drawings, an example of the invention will be described. explain.

1 to 3 are views showing an embodiment of the present invention.

FIG. 1 is a perspective view showing a main part of a threading device for a zigzag sewing machine according to the present application. In FIG. 1, reference numeral 1 has an operating body 2 at an upper end and a threading hook 3 at a lower end, which are vertically movable. The threading rod 5 is reciprocally rotated by the reciprocating movement of the drive plate 5a, and is supported by a vertical shaft 11 fixed to a frame 10 for zigzag sewing by swinging a needle bar 4 and a sewing needle N in a predetermined cycle. The rocking base 6 is a support for the threading rod 1 which is composed of a rocking plate 6b and a main body 6a that is formed integrally with the rocking plate 6b. One end of the oscillating plate 6b is axially supported by the oscillating base 5, and an arcuate through groove 6b1 is formed at the other end and is fitted to a fixed pin P1 fixed to the frame 10. Further, a slit 6a1 is formed in the up-down direction in the body portion 6a as described later.
L is attached to the main body portion 6a of the threading rod support 6, the upper end is fixed to the actuating body 2 through a slit 6a1 formed in the main body portion 6a, and the lower protruding portion is the threading rod 1 A threading operation lever pivotally supported at the lower part of the threading pin, P2 is a locking pin formed at a predetermined position of the threading rod 1, S is abutting against the locking pin P2 when the threading rod 1 is lowered, and S is a threading rod 1 Is fixed to the needle bar 4 by a positioning stopper which holds the threading hook 3 provided at the lower end of the sewing machine at a predetermined height position, that is, a position facing the needle hole O of the sewing needle N.

Reference numeral 7 denotes an urging spring mounted between the operating body 2 and the rocking plate 6b, which normally urges the threading operation lever L, the operating body 2, and the threading rod 1 to the upper original position. These are supported by the threading rod support 6.

FIG. 2 is a longitudinal sectional view showing the main part of FIG. 1, and as shown in the drawing, the threading operation lever L and the threading rod 1 are arranged with the main body portion 6a of the threading rod support 6 in between. It is lined up. The upper end of the threading operation lever L and the upper end of the threading rod 1 are connected and fixed via an actuating body 2.

That is, the threading rod 1 is axially supported by the lower receiving portion 2a of the actuating body 2, and is supported at a predetermined position by the biasing spring 8 interposed between the upper receiving portion 2b and the upper end portion of the threading rod 1. Has been done.

Then, the upper end of the threading operation lever L is fixed to the projecting portion 2c of the actuating body 2 that fits into the slit 6a1 provided in the main body portion 6a of the threading rod support body 6 with the screw 2d.

FIG. 3 shows the rotation operation of the threading rod 1, in other words, the constituent action of lowering to the needle hole position and rotating the threading hook 3 facing the needle hole to be inserted into the needle hole O. FIG.

In the figure, 2e is a penetrating inclined groove formed in the side wall of the actuating body 2, and an engaging pin P2 formed in the threading rod 1 is fitted in this inclined groove 2e.

The operation of the embodiment will be described under the above configuration.

In FIG. 1, the main body portion 6a of the threading rod support 6 draws an arc locus similar to that of the needle bar 4 by the swing plate 6b that is driven by the swing base 5 of the needle bar 4 by the reciprocating motion of the drive plate 5a. Since they oscillate in synchronism with each other, the relative position between the threading rod 1 having the threading hook 3 at the lower end and the needle bar 4 is always kept constant. That is,
The tip of the threading hook 3 and the needle hole O are at positions facing each other (the height positions thereof are different at this point).

On the other hand, when the sewing machine is stopped and the threading operation lever L is pushed down against the biasing spring 7 for threading work, the threading rod 1 is connected to the threading rod locking pin P2 via the operating body 2. Needle bar 4
The needle threading hook 3 provided at the lower end of the threading rod 1 is located at the same height as the needle hole O at this point.

Further, when the threading operation lever L is pushed down, the operating body 2
Compresses the urging spring 8 interposed between the upper end of the threading rod 1 which is stopped and only the operating body 2 descends. Then, the engaging groove 2e on the side wall of the operating body 2 is engaged. Engagement pin P2
Rotates at the height position together with the threading rod 1 by a predetermined amount.
That is, as shown in FIG. 3 (a), as the actuation body 2 descends, it moves from the lower right end position to the upper left end position in the inclined groove 2e in the figure. (Of course, the height position of the engagement pin P2 does not change.) Therefore, the threading hook 3 provided at the lower end of the threading rod 1 makes horizontal rotation around the threading rod 1 (see FIG. b)) The tip thereof is rotationally moved by a distance corresponding to the horizontal movement distance of the engagement pin P2 in FIG.

When the thread is engaged with the threading hook 3 protruding from the needle hole O as shown in FIG. 3 (c) and the threading lever L is released, the threading hook 3, the threading rod 1, the operating body 2, The threading lever L and the like are returned to their original positions by the urging force of the urging springs 7 and 8 in a process reverse to the above, and the threading operation is completed.

[Effects of the Invention] The present invention is a zigzag sewing machine that is excellent in threading workability and can be compactly configured with a small number of parts due to the above-described configuration operation, and can be assembled easily and reduce cost cost. Can be realized.

[Brief description of drawings]

FIG. 1 is a partially omitted perspective view showing an embodiment of the present invention,
FIG. 2 is a longitudinal sectional view of an essential part in FIG. 1, and FIGS. 3 (a), (b) and (c) show rotation of the threading rod and operation of inserting the threading hook into the needle hole and sewing. It is explanatory drawing which shows the state which engages a thread with the threading hook inserted in the needle hole of a needle. In the figure, 1 ... Threading rod 2 ... Actuator 2e ... Inclined groove 3 ... Threading hook 4 ... Needle bar 5 ... Swing base 6 ... Threading rod support 6a ... Main body 6b …… Swing plate 6b1 …… Through groove L …… Threading operation lever P1 …… Fixing pin P2 …… Locking pin

Claims (1)

[Scope of utility model registration request] 1. A zigzag sewing machine including a threading device configured to keep a relative positional relationship between a threading hook and a needle hole of a sewing needle constant, the threading device having an operating body at an upper end thereof. , A threading rod that has threading hooks at its lower ends and can move up and down, a threading rod support that is connected to and follows the oscillating base of the needle bar, and is attached to the main body of the threading rod support. The upper end is fixed to the actuating body through a slit formed in the main body, and the lower protruding portion is composed of a threading operation lever pivotally supported on the lower portion of the threading rod. One end of an oscillating plate provided on the upper end of the main body of the rod support is pivotally supported on an oscillating table, and a through groove that engages with a fixed pin is formed at the other end to descend to an appropriate position of the needle bar. A positioning stopper is provided to allow the locking pin of the threading rod to come into contact with it. A zigzag sewing machine characterized in that an inclined groove into which an engaging pin of a threading rod is fitted is formed on a side wall of an operating body through which an upper end is inserted.