Lower thread tension adjusting device of sewing machines

Details Lower thread tension adjusting device of sewing machines Lower thread tension adjusting device of sewing machines

1983-06-09

1985-07-23

Reynolds, Wm. Carter

Sewing

Elements

Revolving hooks

112254, D05B 6300

Patent

active

045302960

ABSTRACT:
A sewing machine has a loop taker rotated in horizontal plane and a bobbin carrier contained in the loop taker. The bobbin carrier has an abutment secured thereto and a leaf spring mounted on the abutment and movable to and away from the abutment to adjust a tension applied to a lower thread extending between the abutment and the leaf spring. A plurality of windings are provided on a stationary horizontal plane adjacent the underside of the loop taker. The windings are progressively energized by selective operation of an electric control part to create a revolving magnetic field. A magnet is rotated in accordance with the revolving magnetic field, and the rotation of the magnet is transmitted through a series of gears to a cam which actuates a member influencing the movement of the leaf spring, thereby adjusting the tension applied to the lower thread.

REFERENCES:
patent: 2690726 (1954-10-01), Wener
patent: 2763227 (1956-09-01), Howard
patent: 4331090 (1982-05-01), Hanyu et al.
patent: 4377980 (1983-03-01), Hanyu et al.
patent: 4429649 (1984-02-01), Eguchi et al.

Affiliated with

Also associated with

Rating

Lower thread tension adjusting device of sewing machines does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Lower thread tension adjusting device of sewing machines, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Lower thread tension adjusting device of sewing machines will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-629908