Automatic upper thread tension control for a sewing machine

Details Automatic upper thread tension control for a sewing machine Automatic upper thread tension control for a sewing machine

1985-11-12

1987-09-01

Schroeder, Werner H.

Sewing

Elements

Tensioning

D05B 4704

Patent

active

046900837

ABSTRACT:
An automatic thread tension adjusting device for a sewing machine designed to automatically adjust the tension of upper thread to produce desired stitches each formed with the upper and lower threads interlocked with each other within the thickness of a fabric to be sewn, the interlocking position of the threads depending upon the types of stitches such as the straight stitches and zigzag stitches. The thread is held and drawn-out at predetermined angular positions of an upper drive shaft, which are detected by sensors to thereby draw out a required amount of upper thread depending upon the thickness of the fabric and the type of stitches. The required amount of the upper thread is supplied to a thread take-up lever to determine the upper thread tension during the formation process of each stitch.

REFERENCES:
patent: 4166423 (1979-09-01), Brienza et al.
patent: 4215641 (1980-08-01), Dobrjanskyj et al.
patent: 4289087 (1981-09-01), Takenoya et al.
patent: 4301757 (1981-11-01), Tonomura
patent: 4377980 (1983-03-01), Hanyo et al.
patent: 4611547 (1986-09-01), Kuramoto
patent: 4616583 (1986-10-01), Takano et al.

Affiliated with

Also associated with

Rating

Automatic upper thread tension control for a sewing machine does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Automatic upper thread tension control for a sewing machine, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Automatic upper thread tension control for a sewing machine will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1257913