Thread tension mechanism and sewing machine

Details Thread tension mechanism and sewing machine Thread tension mechanism and sewing machine

2007-06-06

2008-10-07

Izaguirre, Ismael (Department: 3765)

Sewing

Elements

Tensioning

Reexamination Certificate

active

07430973

ABSTRACT:
A thread tension mechanism and a sewing machine includes a thread tension dial, a pair of thread tension discs and a dial shaft secured unrotatably to an element constituting a body of the thread tension mechanism and rotatably supporting the thread tension dial; and first and second coil springs mounted in intimate contact with an outer periphery of the dial shaft. The second coil spring is spaced from the first coil spring and wound in a same direction as the first coil spring; and a pair of non-confronting outer end portions positioned at both ends of the first coil spring and the second coil spring or a pair of inner end portions positioned at confronting ends of the first coil spring and the second coil spring are engaged with the thread tension dial so as to be unrotatable relative to the thread tension dial.

REFERENCES:
patent: 3667414 (1972-06-01), Illes et al.
patent: 4803936 (1989-02-01), Mikuni et al.
patent: 5216970 (1993-06-01), Sakuma
patent: 5711238 (1998-01-01), Matsuo et al.
patent: 6050205 (2000-04-01), Terao
patent: 6145457 (2000-11-01), Imaeda et al.
patent: A 2000-045614 (2000-02-01), None
patent: A 2000-202182 (2000-07-01), None

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