Lockstitch sewing by needle looper

Sewing – Stitch forming – Revolving-hook type

Patent

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Details

112223, D05B 5708, D05B 8510

Patent

active

042816092

ABSTRACT:
A lockstitch sewing machine utilizing a needle looper to extend upwardly through a work material to grasp an upper thread and pull it downwardly through the work material to a looptaker which casts the upper thread about a lower thread in order to form a lockstitch. When the needle looper is in an upper position to catch an upper thread, a hook needle is exposed and thread is deflected into the hook thereof. As the needle looper is retracted to a depressed position the hook needle is moved to a guard position so as to retain the upper thread therein during transit. When the needle looper is at its lower position, the hook is again exposed to release its thread to a looptaker for concatenation with a lower thread.

REFERENCES:
patent: 544723 (1895-08-01), Cornely
patent: 2242528 (1941-05-01), Kozibroda
patent: 2426636 (1947-09-01), Monroe
patent: 2887966 (1959-05-01), Felton

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