Tokai Kogyo Mishin Kabushiki Kaisha

Yuichiro Suzuki

Ikuo Tajima

Satoru Suzuki

Masayoshi Hirate

Katsuharu Yoshikawa

Hirofumi Takagi

Individual motors in a sewing machine of the invention are provided, for each of a plurality of machine heads, for individually driving respective mechanical components, such as a needle bar driving mechanism, thread take-up lever and presser foot mechanism. A plurality of rotary hooks are driven by a common motor. Even in a case where embroidering workpieces set on the individual machine heads differ in material between the heads and upper threads used for the machine heads differ in characteristic between the heads, the sewing machine can make, in a concurrent, parallel fashion, embroidery products of different texture suited for the respective materials, characteristics, etc., by setting independent stitch formation per machine head.

Multi-head embroidery sewing machine

Looper section provided under a needle plate includes: a plurality of loopers arranged in an array along a curved movement path; and a movement mechanism for moving the plurality of loopers along the curved movement path to selectively position one of the plurality of loopers in a predetermined needle drop position. Chain-stitch sewing is performed by cooperation between the one looper selectively positioned in the needle drop position and a hooked needle. The looper section projects at its one end portion including the predetermined needle drop position, and a cylindrical sewing workpiece can be taken to and from the needle drop position via the one projecting end portion. The curved movement path is, for example, a U-shaped path.

Chain-stitch sewing machine

According to the present invention, in a sewing machine, a cylindrical frame for retaining tubular objects is mounted integrally on a cylindrical drive ring that is reciprocally driven in a rotational direction around a cylinder bed and that is linearly reciprocally driven along an axis of the cylinder bed; the drive ring is rotatably supported by a support member that is arranged to contact the outer periphery of the drive ring at three or more positions. By utilizing this construction, not only the drive ring, but also the frame that is mounted thereon may have a small diameter, and the drive ring can be stably supported by the support member so that it smoothly rotates. As a result, the frame can retain tubular objects having a small diameter, such as golf club covers and wrist bands, and a sewing operation, such as an embroidery operation, can be suitably performed along the periphery of the tubular object.

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Kasugai, Japan

Yuichiro Suzuki