Thread tensioning device having an electromagnet for applying a

Details Thread tensioning device having an electromagnet for applying a Thread tensioning device having an electromagnet for applying a

1992-12-15

1994-11-15

Crowder, Clifford D.

Sewing

Elements

Tensioning

242150R, D05B 4704

Patent

active

053637860

ABSTRACT:
A thread tensioning device comprising a stationary electromagnet mounted on a sewing machine arm and a tensioning wheel having a relatively low mass. The tensioning wheel is rotatable concentric to a longitudinal axis of the electromagnet and is mounted on the electromagnet so as to be moveable only slightly in the direction of the longitudinal axis. A friction disk is positioned at one end of the electromagnet so as to be between the electromagnet and the tensioning wheel. A current flows through an excitation winding in the electromagnet and its value is varied within given limits by a suitable current control device, thereby causing the electromagnet to pull a flat side of the tensioning wheel with corresponding force against an application side of the friction disk, whereby a corresponding variable thread tensioning force is applied to a sewing thread passing through the tensioning wheel to the sewing machine.

REFERENCES:
patent: 2698590 (1955-01-01), Garbe
patent: 2937605 (1960-05-01), Dunn et al.

Affiliated with

Also associated with

Rating

Thread tensioning device having an electromagnet for applying a does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Thread tensioning device having an electromagnet for applying a , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Thread tensioning device having an electromagnet for applying a will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1090305