JPS58127689A - Yarn eyelet apparatus of looper in sewing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a looper threading device for a sewing machine.

Traditionally, the looper mechanism of overlock sewing machines, for example, is installed in a relatively narrow area below the bed surface, making it difficult to get your fingertips close to the tip of the looper. The disadvantage was that it required a long time for unskilled workers.

This invention was made in view of these drawbacks, and its purpose is to provide a looper threading device for a sewing machine that allows even an unskilled person to easily insert looper thread into the thread hole of the looper. is to provide.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a partial perspective view of a looper threading device disposed below the bed of an overlock sewing machine.

In the figure, l is a hollow moving shaft supported on the machine frame 3 so as to be slidable along the centerline direction Y of a thread hole 2A provided at the tip of a well-known looper 2 stopped at a predetermined position, and 4 is a hollow moving shaft of the looper 2.
It is a movable plate fixed to the moving shaft 1 in parallel with the longitudinal direction of the plate, and moves in the direction of the arrow Y as the moving shaft 1 moves in the direction of the arrow Y.

6 inserts the thread into the two holes of the looper 2 by moving the moving shaft 1 in one direction along the direction of the arrow Y, and removes the thread from the two holes of the looper 2 by moving the thread in the opposite direction along the direction of the arrow Y. The proximal end is fixedly connected to the movable plate l as shown in FIG.
In the embodiment shown in FIG. 1, the movable plate 4G is fixedly supported by a screw 7, but as shown in FIG. A horizontal rod 8 is fixed in the middle, the proximal end of the movable plate IG is fixed, and the horizontal rod 8 is inserted into the hole 9A of the locking rod 9 having a hole 9A at the tip. The looper 2 may be configured so that the thread passes through the two thread holes and exits when the thread is removed.

Reference numeral 10 denotes an operating shaft supported in the hollow of the hollow moving shaft 1 so as to be able to swing around its central axis (see FIGS. 8 and 4).The base end is fixed to the operating lever 11, and the operating shaft is Lever 1
It rotates by the clockwise rotation of step 1.

12 is swingably supported by the movable plate 4, and has a shaft pin 12 at the tip.
A guide arm 18 is a link mechanism connecting the guide arm 12 and the operating shaft 10 so that the guide arm 12 rotates about the rotation axis 12B.The guide arm 18 is rotatably supported on the guide arm 12. It is composed of a first link 18A, a crank arm 18B fixed to the operating shaft 10, and a second link 18c rotatably supported by the first link 18 and the crank arm 18B.

Reference numeral 14 denotes a guide hole 14 that fits into the shaft pin 12A of the guide arm 12.
A hooking part 14B that has a shape A and hooks the looper thread at the tip.
It is a thread hook upper arm whose other end is rotatably supported by a connecting rod 15 rotatably supported by the guide arm 12, and the hook portion 14B is opened in a direction intersecting with the moving direction of the hook 6. ing.

16 is fixed to a first link 18A constituting a link mechanism 18 that moves with the rotation of the operation shaft 10, and as the link mechanism 18 moves, the hook 14B of the upper arm 14 is connected to the hook 6A of the hook 6. Preparation position away from (see Figure 5)
It is a cam body having a cam surface 16A that rotates the connecting rod 15 by contacting with a bottle 15A fixed to the connecting rod 15 so as to guide the movement of the i-phrase needle 6 from above the hook 6A (see Fig. 7). be.

Although the thread hooking upper arm 14 is operated as described above through these operations via the cam body 16 and the connecting rod 15, it is also possible to integrate the guide arm 12 and the thread hooking upper arm 14 so that only the guide arm 12 rotates. to actuate the thread hooking upper arm 14 as described above,
7. It may be configured as follows.

Reference numeral 17 denotes a thread handling body, whose base end is fixed to the thread hooking upper arm 14, and is always positioned behind the opening of the hooking portion 14B of the thread hooking upper arm 14 due to its own elastic force (FIG. 5).

(See Fig. 6) The thread hooking upper arm 14 is connected to the shaft pin 12A of the guide arm 12.
The shaft pin 12A rotates while being guided by the shaft pin 12A.
The hook 14. B Move the upper arm 14 forward
The guide hole 14A is disposed across the guide hole 14A.

In addition, S is a spring interposed between the thread hook body 14 and the guide arm 12 and always acts to return the thread hook body 14 to its original position, and 20 is a guide rod fixed to the machine frame 3 extending along the Y direction. , 21 is a tension body loosely fitted to the guide rod 20 via a spring 19, and 22 is a plate fixed to the machine frame 3G.

Next, this invention will be explained in detail.

FIG. 3 shows the state of the operating lever 11 and other mechanisms when the hooking portion 14B of the upper arm 14 is in the ready position. In this state, the hook 6 is separated from the looper 2 as shown in FIG.

First, as shown in FIG.
Hook it to 4B.

After that, the middle of the looper thread is passed through the tension body 20 to the machine frame 8.
Therefore, tension is always applied to the looper thread. Incidentally, instead of applying tension to the looper thread using the tension body zO, tension may be applied to the looper thread manually.

Next, when the operating lever 11 is pulled forward in the direction of arrow Y from the state shown in FIGS. 4 and 5, the moving shaft 1 and the operating shaft 10 are also moved, and the movable plate 4 is also moved accordingly.

As the movable plate 4 moves, the hook 6 fixed thereto also moves toward the surplus water 2A at the tip of the looper 2, and as shown in FIG.
This will happen.

Then, while holding the operating lever 11 in the above-mentioned state, when the operating lever 11 is rotated clockwise as shown by the solid line in Figure 1 and the solid line in Figure 4, only the operating shaft 10 is rotated clockwise. As a result, the link mechanism 13 moves to the left as shown in FIG.

As the link mechanism 18 moves, the guide arm 12 rotates clockwise, and the cam body 16 also moves to the left.

As the cam body 16 moves, its cam surface 16A comes into contact with the pin 15A of the connecting rod 15, causing the connecting rod 15 to rotate clockwise. Then, in conjunction with the rotation of the connecting rod 15, the thread hooking upper arm 14 is guided by the shaft pin 12A, and its hooking portion 14B approaches the direction of the two thread holes of the looper 2. Along with this, the shaft pin IZA moves from the upper end to the lower end of the guide elongated hole 14A, comes into contact with the yarn handling body 17, and
is gradually moved from the rear of the hooking portion 14B of the upper arm 14 to the front of the hooking portion 14B against the elastic force of the thread handling body 17 itself, and is hooked onto the hooking portion 14E as shown in FIG. The looper thread that had been stopped is removed from the surplus water 2A of the looper 2 and dropped onto the hook 6 that has come out.

Then, when the operating lever 11 is now turned counterclockwise G and returned from the front to the front in the figure along the direction in which the two thread holes of the looper 2 are punched, the thread hooking upper arm 14 moves the looper thread. It returns to its original position while remaining on the hook needle 6, and moves back to the original position of the movable plate. The hook 6, which is returned to its original position by the movement of the movable plate 4, is attached to the hook 6A by the looper y.
In order to return to the original position through the surplus water 2A of the looper 2 while keeping f and L hooked, the looper thread spool is inserted into the two thread holes as shown in FIG.

After passing the looper thread through the surplus water 2A of the looper 2 in this way, use a bottle set or the like to pull the tip of the looper thread out of the thread hole, and the looper thread will be completely removed from the surplus water of the looper 2. It will be inserted into water 2A.

As described above, according to the present invention, the looper thread is positioned on the hook protruding from the residual water of the looper by the movement of the threader's upper arm, and the looper thread is separated from the hooking part of the threader's upper arm by the thread handling body. The looper thread hooked on the hook of the crochet hook is guided by the looper's residual water G when the crochet needle is returned to the crochet hook. This has the effect that the looper thread can be passed through the excess water at the tip of the O-thick looper very easily, and the time required for one sewing operation can be greatly shortened.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an apparatus according to one embodiment of the invention, FIG. 2 is a perspective view of main parts of another embodiment, FIGS. 3 and 4 are explanatory diagrams of the operation of the apparatus shown in FIG. Figures 5 to 8 are explanatory views of the operation of the main parts of the device shown in Figure 1. 1 z... Guide Arm 14... Threading upper arm 17... Name of thread handling body agent Patent attorney Nagoya - Yu (11)

Claims (1)

[Scope of Claims] A hollow moving shaft supported on the machine frame for reciprocating motion parallel to the center line of the looper stopped at a specific position; and a movable shaft fixed to the moving shaft parallel to the longitudinal direction of the looper. The base end is fixed to the movable plate, and the free end is equipped with an upward hook that moves forward and backward through the thread size of the looper at a specific position in conjunction with the reciprocation of the movable plate, and a hook on the moving axis. An operating shaft is supported in a hollow space so that it can swing around its central axis, a guide arm is supported on a movable plate so that it can swing in conjunction with the rotation of the operating shaft, and the middle of the looper thread is locked at the tip. and has a releasably latching portion that opens in a direction perpendicular to the direction of movement of the crochet hook, such that the latching portion moves away from the hook of the crochet needle in a direction perpendicular to the direction of movement of the crochet hook in association with the swinging of the guide arm. The thread hooking arm is movable between a remote position and a position above the hook of the crochet hook, and the thread hooking arm is always located behind the opening of the hooking portion of the thread hooking arm and the hooking portion of the thread hooking arm is located above the hook of the crochet hook. The thread that moves forward of the hook across the opening of the hook so that the middle of the looper thread that is hooked to the hook is released from the hook onto the hook in connection with the upward movement of the hook of the hook. A threading device for the looper in a sewing machine, which is connected to a handling body.