Tokai Kogyo Mishin Kabushiki Kaisha

Nsd Corporation

Tism Co., Ltd

Isao Ohashi

Ikuo Tajima

Satoru Suzuki

Yoshichika Takizawa

Hirotsugu Uenishi

Masayoshi Ono

Aisuke Murase

Takuya Okamoto

Koichi Nakamura

Disclosed is a sewing machine which evaluates sewing quality using a stitch tightness index. During sewing operation, a used length of an upper thread per stitch is detected, and a stitch tightness index per sewn stitch is calculated on the basis of a stitch length per stitch defined by sewing pattern data, a fabric thickness of a sewing workpiece, and detected data of the used length of the upper thread. Then, notification is made which corresponds to the calculated stitch tightness index per sewn stitch (such as a visual display of the stitch tightness index). After that, acceptability/non-acceptability of the thread tightness per sewn stitch can be determined by comparing the calculated stitch tightness index per sewn stitch against a reference value, and a result of the determination can be notified.

Sewing quality control in sewing machine

Bobbin case containing a lower thread bobbin mounted in a rotary hook of a sewing machine is exchanged for a new bobbin case by the bobbin case being transferred between the rotary hook and a bobbin stock section provided apart from the rotary hook. Transfer mechanism reciprocatively transfers a bobbin grasping device, grasping a bobbin case at a distal end portion of a chuck section, between the rotary hook and the bobbin stock section. In a predetermined position of a transfer stroke of the bobbin grasping device, an orientation change mechanism changes the orientation of the chuck section, being transferred toward the rotary hook, so that the chuck section faces toward the rotary hook, and changes the orientation of the chuck section of the bobbin grasping device, being transferred toward the bobbin stock section, so that the chuck section faces toward the bobbin stock section.

Bobbin changer apparatus for sewing machine

Provided is an embroidery frame clip which can effectively prevent itself, without marring operability of fitting it to an embroidery frame, from slipping off the frame, when the tension of an embroidering cloth is increased as stitching goes on. The embroidery frame clip is designed to hold an embroidering cloth a in tension over a rectangular embroidery frameby clipping the cloth a between a railformed on an upper surface of the embroidery frame circumferentially along the inner rim thereof and the clip fitted on the rail. The clip has a clip main bodyto be fitted on the railand auxiliary membersattached to the clip main body, for preventing the clip main bodyfrom deforming to open as stitching of the embroidering cloth goes on.

Clip for embroidery frame

A multineedle embroidering sewing machine comprising at least one sewing machine head provided with a plurality of needle bars and a plurality of thread take-up levers corresponding to the needle bars, needle thread deflecting sections, respectively, arranged upstream of the respective thread take-up levers existing in needle thread paths, and thread take-up members provided correspondingly on the respective needle thread deflecting sections.

Sewing machine having roller thread guide upstream of take-up lever

Multineedle embroidering sewing machine

Growing community of inventors

Komaki, Japan

Isao Ohashi