Overedge sewing machine
AssigneeMaruzen Sewing Machine Co., Ltd.
InventorsYoshio Mikuni, Osamu Koshinaka
Life of this patent
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Abstract
An overedge sewing machine is adapted to perform three thread overedge stitching (STITCH TYPES 504 and 505) under the cooperating action of one needle (6) and an upper looper (15) and a lower looper (31). In addition to swing movement in the direction crossing the fabric feed direction, reciprocating movement in the fabric feed direction is selectively applied to the lower looper, whereby the front end of the lower looper is revolved around the needle. If the lower looper is revolved around the needle with the upper looper out of action, this operation provides double chain stitching (STITCH TYPE 401). Further, if the lower looper is revolved around the needle with the upper looper in action, this operation provides three thread double chain overedge stitching (STITCH TYPE 601).
Claims16
An overedge sewing machine wherein with movements given from a main shaft which is driven for rotation, a needle is substantially vertically moved and an upper looper is substantially vertically moved in the direction which crosses the fabric feed direction and a lower looper is swung in the direction crossing the fabric feed direction, the cooperating action of said needle and said upper and lower loopers performing three thread overedge stitching, said overedge sewing machine being characterized in that it comprises:
- means for selectively stopping the substantially vertical movement of said upper looper;
- and
- means for applying reciprocating movement in the fabric feed direction to said lower looper with the timing agreeing with the substantially vertical movement of said needle.
Dependencies are inferred from the claim text.