Sewing machine with thread tensioning and take up levers

Details Sewing machine with thread tensioning and take up levers Sewing machine with thread tensioning and take up levers

1998-09-24

1999-11-16

Izaguirre, Ismael

Sewing

Elements

Take-ups

11247517, 112255, D05B 4900

Patent

active

059838183

ABSTRACT:
A sewing machine that has at least one needle which moves with alternating motion, taking the upper thread through the piece to the sewn, a shuttle to hook an upper thread to form a loop below the piece to be sewn, a bobbin housing in a bobbin-case located internally in the shuttle, the bobbin containing a lower thread which overlaps the upper thread through the loop, two mutually independent levers which act on the upper thread and are mobile with periodic motion between a position where the upper thread is allowed to be fed to the shuttle and a position of complete recovery of the upper thread in which the loop is closed to form a stitch, the upper thread being synchronized with movement of the levers by periodic tension.

REFERENCES:
patent: 827652 (1906-07-01), Onderdonk
patent: 860546 (1907-07-01), Ives
patent: 4215641 (1980-08-01), Dobrjansky et al.
patent: 4907517 (1990-03-01), Hanyu et al.
patent: 5495816 (1996-03-01), Sanvito et al.

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