JPS6414380U - - Google Patents

Description

[Brief explanation of the drawing]

The drawings relate to embodiments of the present invention; Fig. 1 is an explanatory diagram of the operating mechanism of the warp prevention mechanism of the present invention, Fig. 2 is an explanatory diagram of the upper thread pressing action, and Figs. 3 and 4 are illustrations of the upper thread support. FIG. 3 is a top view, FIG. 4 is a view in the direction of arrow A, FIG. 5 is an explanatory diagram of the operating mechanism of the warp prevention mechanism of another embodiment, and FIG. FIG. 7 is a top view of the hook; FIG. 8 is an external view of a sewing machine incorporating the warp prevention device of the present invention; FIG. 9 is an explanatory diagram of the drive mechanism of the sewing machine;
Fig. 10 is an explanatory diagram of a seam, Fig. 11 is an explanatory diagram of a state where cracks occur in the conventional seam forming process, and Fig. 12 is an explanatory diagram of a seam formation process.
The figure is an explanatory view of the seam forming process using the warp prevention device of the present invention, where 32 is a lower thread, 33 is a lower thread winder, 34 is an inner hook, 35 is an elastic body, 36 is an upper thread presser, and 37 is a support. body, 38 is rod, 39 is driven body,
40 is a headed pin, 41 is a cam, 42 is a spring, 4
3 is a magnet, 44 is a flexible member, 45 is a pressing body, 4
6 is a magnet.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) During the seam forming cycle, the needle thread loop captured by the hook is placed and pressed on the needle thread path on the seam side from the hook at a position where it does not always contact the needle thread. an elastic body that provides resistance to the needle thread when the needle thread comes into contact with the needle thread; a first position that is disposed opposite to the elastic body and operates to act on the needle thread and press it against the elastic body; A warp prevention device for a sewing machine comprising an upper thread pressing member movable to a second position for releasing the upper thread, and an actuating means for operating the upper thread pressing member according to a phase. (2) The first position in which the pressing body operates is from the phase in which the hook that has captured the needle thread in the stitch forming cycle pushes the needle thread ring to its maximum extent, to just before the needle thread ring escapes from the pressing member. The warp prevention device for a sewing machine according to claim 1, which is a phase interval up to a phase.