JPS6112054Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field] This invention relates to a looper body for a chain stitch sewing machine.

[Prior art]

The looper body of a conventional chain stitch sewing machine has a thread guide hole near the tip of its open end, and the insertion of the looper system into this thread guide hole is a delicate task using tweezers, so it takes a short time. The problem was that it was not easy to do.

〔the purpose〕

Therefore, the present invention was devised to eliminate the conventional defects, and includes a notch provided near the tip of the looper body, and a proximal end of the notch attached to the proximal side of the looper body. A thread hook is formed by a wire-like thread hook whose open end extends above the notch,
The looper thread can be easily hooked onto the thread hook through the insertion gap provided between the thread hook and the notch.

〔Example〕

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be explained in detail with reference to the drawings showing an embodiment of the present invention in a looper body of a hem stitch sewing machine. A looper body 1 whose base end is attached to a looper shaft (not shown) of a hemlock sewing machine
is operated in the same manner as the looper body shown in FIG. 6 of Japanese Patent Publication No. 47-2984, and cooperates with a needle (not shown) to form a hem stitch.

The looper body 1 has a tip 2 at the upper part of its open end, and a first notch 3 is formed near the bottom of the tip 2 by cutting it back and forth along the cloth feeding direction of the sewing machine. , a second notch 4 is cut out on the back side of the sewing machine cloth feed side following the notch 3.
is formed. Furthermore, the looper body 1 includes:
A concave groove 5 is provided from the first notch 3 toward the proximal end of the looper body 1, and a deep hole 6 is provided in the concave groove 5 toward the proximal end of the looper body 1.

The wire-like thread hanging body 7 has a hook-shaped base end, and its hook-shaped tip 7a is fitted into the deep hole 6, and the proximal end 7b following it is fitted into the concave groove 5. It is inserted and fixed by brazing. Furthermore, the open end side of the thread hanging body 7 is extended toward the distal end of the looper body 1 so as to straddle the first notch 3, and the distal end is curved toward the proximal end side of the looper body 1. A curved portion 7c is provided. Further, as shown in FIG. 3, the tip of the curved portion 7c is located in the second cutout portion 4 so as to form a back surface that is substantially the same as the back surface of the looper body 1 on the sewing machine cloth feed side, and , and the bottom 4a of the second notch 4, so as to form a gap t large enough for the looper thread LT to pass through. Further, the curved portion 7c is arranged to intersect with the edge 3a of the first notch 3 at a slightly proximal end side of the first notch 3 relative to the open end side of the looper body 1. There is.

Therefore, when inserting the looper thread LT into the thread hooking body 7, after pulling out an appropriate amount of the looper thread LT from the thread supply side to the looper body 1 side, hold the open end of the looper thread LT and insert the looper thread LT. The LT is guided from the front side of the looper body 1 to the intersection of the edge 3a of the first notch 3 and the curved part 7c of the thread hook 7, and the end side of the looper thread LT is guided from the front side of the looper body 1. Move the fabric to the rear on the unwinding side, then thread the looper thread.
By pulling the end of the LT toward the rear of the proximal end of the looper body 1, the looper thread LT is pulled through the gap t between the bottom 4a of the second notch 4 and the curved portion 7c of the thread hook 7. It is guided into the thread hanging body 7. After being inserted into the thread hook 7 in this way, the edge 3a of the first notch 3 and the curved portion 7c of the thread hook 7 prevent the looper thread LT from slipping out from the gap t. Therefore, the looper thread LT will not come off from the thread hanging body 7.

Further, when sewing is started in this state, the base end 7b of the thread hook 7 is located in the concave groove 5, and
Since the back surface of the curved portion 7c substantially coincides with the back surface of the looper body 1, the thread hanging body 7 does not have an adverse effect on seam formation.

〔effect〕

As detailed above, the present invention is based on the looper thread LT.
The looper body 1 can be inserted very easily and has no adverse effect on seam formation.
When assembling, the hook-shaped tip 7a and base end 7b of the wire-like thread hanging body 7 are attached to the looper body 1, respectively.
Since the device is simply inserted and positioned into the deep hole 6 and the concave groove 5, and then fixed by brazing or the like, it is easy to perform and has excellent practical effects.

[Brief explanation of the drawing]

Figure 1 is a front view of the looper body of the present invention with the looper thread inserted through it, Figure 2 is a rear view, Figure 3 is a left side view, and Figure 4 is a state with the wire-like thread hook removed from the looper body. FIG. In the figure, 1 is the looper body, 2 is the tip, 3 is the first notch, 3a is the edge, 4 is the second notch, 4a is the bottom, 5 is the concave groove, 6 is the deep hole, and 7 7a is a hook-shaped tip, 7b is a proximal end, 7c is a curved portion, and LT is a looper thread.

Claims (1)

[Scope of Claim for Utility Model Registration] A looper body whose base end is attached to the end of a looper shaft, a looper thread LT is inserted near the tip 2 of the open end, and forms a chainstitch stitch in cooperation with a sewing machine needle. 1, a first notch 3 is formed by cutting back and forth along the cloth feeding direction of the sewing machine near the tip 2 of the looper body 1; A second notch 4 is formed by cutting out the back surface, and a deep hole 6 is provided toward the proximal end of the looper body 1 from the first notch 3. The concave groove 5 has a proximal end formed in a hook shape, and the hook-shaped tip 7a thereof is fitted into the deep hole 6, and the proximal end 7b following it is inserted into the concave groove 5. The open end side faces the distal end of the looper body 1 and extends across the first notch 3, and the distal end curves toward the proximal end of the looper body 1 to form a second notch. a wire-like thread hanging body 7 located in the second cutout part 4 and arranged to have a gap t between it and the bottom part 4a of the second notch part 4 to a size that allows the looper thread LT to pass therethrough; The curved portion 7c of the thread hanging body 7 is arranged so as to intersect with the edge 3a of the first notch 3 at a position slightly closer to the proximal end than the open end of the looper body 1 of the first notch 3. The looper body is constructed such that the looper thread LT is hung on the wire-like thread hook 7 through the gap t between the wire-like thread hook 7 and the second notch 4.