Sewing machine and synchronizing attachment therefor

Details Sewing machine and synchronizing attachment therefor Sewing machine and synchronizing attachment therefor

1990-12-19

1991-12-24

Nerbun, Peter

Sewing

Stitch forming

Feeding work material

112320, D05B 2706

Patent

active

050742310

ABSTRACT:
A sewing machine includes, and can have attached thereto, a synchronizing apparatus by which a presser foot bar and a feed foot bar, and the respectively connected presser foot and feed foot, are lifted and lowered in synchronization with the vertical reciprocation of a needle bar to which a stitching needle is connected. A lift body is pivoted to both the presser foot bar and the feed foot bar. The lift body has an arcuate surface against which a roller connected to the needle bar acts to pivot the lift body alternately about the two connections. This provides appropriate lifting and lowering of the presser foot bar and the lift foot bar during a stitching cycle.

REFERENCES:
patent: 3952675 (1976-04-01), Thompson
patent: 4296703 (1981-10-01), Thompson
patent: 4323020 (1982-04-01), Thompson
patent: 4341172 (1982-07-01), Thompson
patent: 4449464 (1984-05-01), Porter
patent: 4611548 (1986-09-01), Holl
patent: 4616586 (1986-10-01), Scholl

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