Thread tensioning device for a sewing machine

Details Thread tensioning device for a sewing machine Thread tensioning device for a sewing machine

1980-03-21

1981-01-27

Hunter, H. Hampton

Sewing

Elements

Tensioning

242153, D05B 4704

Patent

active

042468574

ABSTRACT:
A thread tensioning device for a sewing machine, which is capable of automatically imparting, without any manual operation, a thread passing therethrough a suitable tension for the ordinary sewing, in accordance with the kind of thread as well as the thickness thereof. The device includes a pair of plate members closely confronted to each other for forming a narrow gap therebetween, being constantly urged by spring force acting at a concentrated point on one of the two members, and either one is provided with, on the inside surface thereof, a plurality of grooves formed perpendicularly to the direction of the thread running, each groove having a sharpened edge between the side surface of the groove facing the thread advancing direction and the thread engaging surface of the plate member for imparting a resistance independent of the spring force to the thread according to the surface condition thereof peculiar to each kind of threads.

REFERENCES:
patent: 257052 (1882-04-01), Neilly
patent: 3347195 (1967-10-01), Gegauf
patent: 4111140 (1978-09-01), Gonnai et al.

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