JPS61170484U - - Google Patents

Description

[Brief explanation of the drawing]

Figures 1 to 6 show an embodiment of this invention. Figure 1 is a plan view of the main parts of a horizontal hook in a zigzag sewing machine, Figure 2 is a plan view of the entire horizontal hook, and Figure 3 is a plan view of the entire horizontal hook. FIG. 4 is an enlarged cross-sectional view taken along the line - in FIG. 1, FIG. 5 is a plan view illustrating the operating state, FIG. It is a top view of the horizontal pot which shows an example. 1...Outer pot, 2...Inner pot, 4...Notch, 5...
...Sword tip, 7... Thread ring engagement protrusion, 9... Engagement surface, N
... Sewing needle, N1 ... Eye hole, Y1 ... Thread ring, A ...
Maximum swing range, L, R... Maximum swing position.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A sewing needle capable of vertically reciprocating movement and horizontally swinging movement, and having a tip for catching a thread ring formed near the eye of the sewing needle, and having a point around a vertically fixed axis. an outer hook that rotates, and an inner hook that is fitted and held in the outer hook and has a notch that allows the sewing needle to fall;
In the zigzag sewing machine in which the tip catches the thread ring of the sewing needle that has fallen into the inside of the outer hook, the rotational direction of the sewing needle is within both edges of the notch formed in a direction that intersects with the rotational direction of the outer hook. A thread ring engaging protrusion is provided on one end edge located on the side opposite to the thread ring engaging protrusion, and the thread ring engaging protrusion is located on the one end edge side in both swing extreme positions of the maximum swing range of the sewing needle. A thread ring engaging protrusion is formed to extend so as to be close to the swinging limit position and to be located directly above the movement locus of the tip, and engages with the thread ring of the sewing needle to move the thread ring of the tip. The thread ring engaging protrusion is characterized in that an engaging surface of the thread ring engaging protrusion extends from the vicinity of one swing limit position of the sewing needle toward the inner circumferential surface of the outer hook in order to hold the thread ring in a state intersecting the movement locus. Skipping stitch prevention device for zigzag sewing machines equipped with a horizontal hook. (2) A skipped stitch prevention device for a zigzag sewing machine equipped with a horizontal hook as set forth in claim (1) of the utility model registration claim, wherein the thread ring engaging protrusion is integrally formed with the inner hook. . (3) A utility model according to claim 1, wherein the engaging surface of the thread ring engaging protrusion is formed to be inclined with respect to the rotating direction of the outer hook. Skipping stitch prevention device for zigzag sewing machines equipped with a horizontal hook.