Thread chain sewing method and device for use in the two-needle overlock sewing machine

摘要

A thread chain sewing method and device for use in the two-needle overlock sewing machine comprising an inner chaining-off finger arranged to be retractable from an advanced position in which it is positioned alongside an outer chaining-off finger. The inner chaining-off finger is retractable in a direction opposite the fabric material feeding direction. The inner chaining-off finger is held in its advanced position during sewing over the fabric as well as during a thread chain forming period after the trailing edge is stitched. Thread chains formed before the start of sewing are wrapped only over the outer chaining-off finger, while thread chains formed after the trailing edge of the material passes are bridged over the inner and outer chaining-off fingers.