Needle bar disengaging device for sewing machines

Details Needle bar disengaging device for sewing machines Needle bar disengaging device for sewing machines

1977-04-04

1978-12-12

Nerbun, Peter

Sewing

Elements

Driving mechanisms

D05B 5516

Patent

active

041290844

ABSTRACT:
The mechanism for driving a sewing machine needle bar and the needle carried thereby in reciprocating motion continues to operate without interruption while the needle bar is selectively disengaged from the driving mechanism to skip stitches. A spring biased latch mechanism has a spring mounted within the needle bar and a catch finger that can be extended from and withdrawn within a slot in the needle bar. A spring under tension urges the needle bar towards its upper position where the needle is out of contact with the work. In one embodiment the spring is attached at one end to the sewing machine frame, and in another embodiment the spring is attached to part of the latch release member. Two forms of latch release member are disclosed, one having a generally straight contact surface for causing retraction of the catch finger, the other form having a slanted contact surface.

REFERENCES:
patent: 1048203 (1912-12-01), Oliver
patent: 3460499 (1969-08-01), Gaines
patent: 3815529 (1974-06-01), Adams et al.
patent: 3872809 (1975-03-01), Adams et al.

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