Stitch forming mechanism of a sewing machine

Details Stitch forming mechanism of a sewing machine Stitch forming mechanism of a sewing machine

1974-08-29

1976-11-23

Schroeder, Werner H.

Sewing

Stitch forming

Revolving-hook type

D05B 5714

Patent

active

039930076

ABSTRACT:
An improved lockstitching mechanism for a sewing machine wherein the cylindrical bobbin case having a bobbin therein for supplying a lower thread has an upper thread guide for slidably guiding a loop of the upper thread across the lower thread and a lower thread guide hole in the side wall below the upper guide for guiding the lower thread being extracted from the bobbin, whereby the lower thread is placed ahead of the needle relative to the rotational direction of the shuttle body supporting the bobbin, such that the upper thread only crosses the lower thread once during each stitching operation to prevent gnarling of the seam commonly referred to as "hitchstitching".

REFERENCES:
patent: 785168 (1905-03-01), Hemleb
patent: 1931456 (1933-10-01), Fleckenstein
patent: 3082722 (1963-03-01), Tateishi
patent: 3693565 (1972-09-01), Ketterer

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