Thread tension adjusting apparatus for a sewing machine

Details Thread tension adjusting apparatus for a sewing machine Thread tension adjusting apparatus for a sewing machine

1992-11-03

1994-04-05

Crowder, Clifford J.

Sewing

Elements

Tensioning

242149, 310314, D05B 4700

Patent

active

052995178

ABSTRACT:
A thread tension adjusting apparatus, used in a sewing machine, adjusts tension of a supplied thread by adjusting a thread holding force. The apparatus is provided on a thread supply path running from a thread source to a thread processing section such as a needle and a looper. The thread tension adjusting apparatus comprises a pair of members respectively having portions opposed to each other. At least one of the members is a piezoelectric actuator for changing a distance between the portions when being driven, whereby to adjust a thread holding force.

REFERENCES:
patent: 1682796 (1928-09-01), Olson
patent: 4984749 (1991-01-01), Matsui et al.
patent: 5033400 (1991-07-01), Fischer
patent: 5056734 (1991-10-01), Uchida et al.
patent: 5186114 (1993-02-01), Ikawa

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