Simplified control mechanisms for sewing machines

Sewing – Work manipulating – Guides

Patent

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Details

112221, 112158D, D05b 302

Patent

active

039570037

ABSTRACT:
A control mechanism for the synchronized operation of the hook, the fabric feeding latch and the needle bar of a sewing machine comprising a main drive shaft driving two juxtaposed eccentrics, one connected through a drive mechanism to the hook for imparting oscillatory movement thereto, the second being drivingly connected through a second mechanism to the fabric feeding latch for imparting oscillatory movement thereto which is synchronized with the oscillatory movement of the hook. The mechanism connecting the second eccentric to the fabric feeding latch includes an adjustable arrangement for adjusting both the stroke of the feeding latch and the direction of its oscillation. The main drive shaft also drives the needle bar through an adjustable mechanism by which the amplitude of zig-zag stitches can be adjusted as well as the centered position of the needle bar. The needle bar is driven in up and down movement from the main shaft through a mechanism with an eccentric which slidably and guidably supports the thread tensioning lever. The needle bar is so constructed that the needle can be inserted in a singular position thereinto, and the needle plate is mounted on the frame of the machine, through the intermediary of studs which cooperate with sloping faces of a slot formed in the frame and resilient tongues which engage beneath the faces of the slot.

REFERENCES:
patent: 3353509 (1967-11-01), Reeber et al.
patent: 3426709 (1969-02-01), Jindrich et al.
patent: 3460496 (1969-08-01), Meier
patent: 3696768 (1972-10-01), Torii

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