Sewing – Stitch forming – Chain or double chain
Patent
1980-06-24
1982-11-02
Nerbun, Peter P.
Sewing
Stitch forming
Chain or double chain
1122691, D05B 120, D05B 110
Patent
active
043567827
ABSTRACT:
A thread chain sewing method and device for use in a two-needle overlock sewing machine. An inner chaining-off finger is held in an advanced position during sewing directly on fabric material. The inner finger is also advanced during the period at which thread chains are formed right after the sewing process passes the trailing edge of fabric material. The inner chaining-off finger is retracted from its advanced position alongside an outer chaining-off finger, in a direction opposite to a fabric material feeding direction, during other periods. The thread chains formed are wrapped only around the outer chaining-off finger before the leading edge of fabric but bridge over the inner and outer chaining-off fingers right after the trailing edge. The needle threads are automatically tightly tensioned during the sewing of fabric, the tension of the needle threads being automatically changed over to slightly tensioned for production of extensible thread chains.
REFERENCES:
patent: 3100469 (1963-08-01), Washburn
patent: 4175499 (1979-11-01), Navlyt
patent: 4186676 (1980-02-01), Villa et al.
patent: 4250824 (1981-02-01), Meier et al.
Matsushita Hideo
Mori Kikuo
Ueyama Yoshinari
Nerbun Peter P.
Pegasus Sewing Machine Mfg. Co. Ltd.
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