Device at a sewing machine for applying a tensile stress in a ma

Details Device at a sewing machine for applying a tensile stress in a ma Device at a sewing machine for applying a tensile stress in a ma

1986-07-11

1987-05-05

Hunter, H. Hampton

Sewing

Stitch forming

Feeding work material

112255, D05B 4704

Patent

active

046622942

ABSTRACT:
A device at a sewing machine for applying a tensile stress in a material to be fed for sewing, particularly a thread, a ribbon etc. Several pneumatic cylinders are arranged in parallel for generating a variable force acting upon at least one friction element. Several pneumatic cylinders are combined into groups, which are selectively controllable by compressed air valves and a selector switch. Due to the special construction of the pneumatic cylinders, there is obtained a cost-saving tensioning device for generating a tensile stress in a material.

REFERENCES:
patent: 3476063 (1969-11-01), Bulqatz
patent: 3565027 (1971-02-01), Miller et al.
patent: 3877405 (1975-04-01), Dorosz et al.
patent: 4102280 (1978-07-01), Hannemann
patent: 4300465 (1981-11-01), Tsuboi
patent: 4449463 (1984-05-01), Gilbride et al.

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