Sewing machine bobbin thread tension control device

Details Sewing machine bobbin thread tension control device Sewing machine bobbin thread tension control device

1989-11-21

1991-09-17

Schroeder, Werner H.

Sewing

Elements

Tensioning

112184, 112242, D05B 4700

Patent

active

050484389

ABSTRACT:
The feed dog (17) for the fabric in a sewing machine is provided with a spring-wire (21) bent and passing through a hole of a support (23). When the feed dog (17) is in its upper position, the support (23) abuts the plate (18), which lowers the end (24) of the wire (21) so as to exert a tension on the lower thread (8) of the seam. When the feed dog is lowered, the wire (21) resumes its normal position, namely its end (24) is displaced upwardly with respect to the dog (17) and the thread (8) is thus relaxed.

REFERENCES:
patent: 3164113 (1965-01-01), Ketterer
patent: 3467039 (1969-09-01), Greenwood, Jr. et al.
patent: 4182250 (1980-01-01), Johnson
patent: 4215639 (1980-08-01), Johnson
patent: 4399761 (1983-08-01), Creed et al.
patent: 4437421 (1984-03-01), Johnson

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