The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 02, 1982
Filed:
Jun. 24, 1980
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.