Ssmc Inc.

The Singer Company N.v.

Koji Kitai

Tatsuo Kikuchi

Takanori Nakayama

A thread trimming device for a sewing machine in which a movable knife coupled to a thread trimmer lever by way of a link mechanism is turned to cut sewing threads in cooperation with a fixed knife, the first projection of the thread trimmer lever engaging in the cam groove of a thread trimmer cam, comprises a thread trimmer positive motion bracket having a second projection capable of engaging in the positive motion cam groove of a thread trimmer positive motion cam so as to keep the engagement of the first projection with the cam groove after the second projection thereof engages the positive motion cam groove until it is disengaged therefrom. Since the time of completing the thread trimming can be set by the positive motion cam groove of the thread trimmer positive motion cam, the timing of the thread trimming can be adjusted with certainty. Furthermore, the operating time of the driving means can be remarkably reduced.

Thread trimming device for a sewing machine

There is disclosed an overlock sewing machine. The overlock sewing machine includes a looper switching unit for selecting an overlocking operative state or overlocking inoperative state, a needle clamp member having a first needle holding hole in which two needles are mounted separately in the manner that the two needles are positioned in parallel and a second needle holding hole positioned slightly eccentrically at the front side of the cloth feeding direction and perpendicular to the cloth feeding direction, whereby eight types of overlocking operations and one type of double-loop stitching operation can be effected.

Overlock sewing machine

The present invention relates to a looper shifting device in an overlock sewing machine having an upper looper and a lower looper and capable of looping the end of the cloth by one needle with use of three threads composed of an upper thread (first thread) in a needle, a second thread in the upper looper, and a third thread in the lower looper. A tip end of a guide passage provided at the upper looper is open to a tip end rear portion of a brade of the upper looper and positioned adjacent to a pore. A horn is retractably inserted in the guide passage. A spreader is defined by the tip end of the horn protruded from the opening and tip end rear portion of the upper looper. There is provided at the side of the upper looper a holding device for holding the base portion of the horn.

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Tochigi, Japan

Koji Kitai