Cloth feeding device for sewing machine and method thereof

Details Cloth feeding device for sewing machine and method thereof Cloth feeding device for sewing machine and method thereof

1975-02-20

1976-07-06

Larkin, George V.

Sewing

Stitch forming

Chain or double chain

112215, D05B 2708

Patent

active

039675653

ABSTRACT:
A cloth feeding device for a sewing machine and a method of adjusting the differential ratio of feeding cloth, in any desired wide range, particularly, in an overlock sewing machine. There is disclosed herein a mechanism wherein a cloth feeding arm is engaged with a vertically feeding cam fixed to a main shaft and is further connected with an eccentric horizontally feeding cam. The feeding cam comprises a flanged cam member frictionally fixed to the main shaft and an internal surface cam externally fitting it through a link mechanism. The link mechanism comprises a horizontally feeding rocker arm and a horizontally feeding rod so that the horizontal feed of the cloth feeding arm may be simply and freely adjusted by varying the phase of the eccentric double cam with an operating piece which can be operated from outside the sewing machine frame. The present invention, also, also contemplates a method of obtaining a differential adjusting ratio of feeding cloth in a wide range by setting two of such adjusting mechanisms within a sewing machine frame so as to be able to be operated independently of each other and making the respective adjusted amounts correspond to each other by utilizing the possibility of the independent adjustment. Also disclosed is a device for achieving the method.

REFERENCES:
patent: 2790331 (1957-04-01), Pinkvoss
patent: 3534696 (1970-10-01), Willenbacher et al.

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