Sewing machine with sequin sewing device

Abstract

In a first shifting operation for shifting a sequin sewing device from an operative position to an evacuated position or in a second shifting operation for shifting the sequin sewing device from the operative position to the evacuated position, descending movement of a needle bar is inhibited by jumping the needle bar with a sewing machine maintained in an operating condition. Also, a jump code is inserted into embroidery data at a position where a shift is to be made from sequin sewing to ordinary sewing or from ordinary sewing to sequin sewing. Alternatively, the descending movement of the needle bar may be inhibited by reducing a rotation speed of the main machine shift with the machine maintained in the operating condition.

Description

BACKGROUND OF THE INVENTION[0001]The present invention relates generally to sewing machines equipped with a sequin sewing device for sewing a sequin onto a sewing workpiece, and more particularly an improved sewing machine capable of moving a sequin sewing device between an operative position where the sewing device can sew a sequin and an evacuated position where the sewing device can not sew a sequin.[0002]Heretofore, there have been known sewing machines which are provided with a sequin sewing device to sew sequins (spangles) onto a sewing workpiece. Japanese Patent Application Laid-open Publication No. 2004-167097 (hereinafter referred to as “Patent Literature 1”) discloses a multi-head embroidery sewing machine equipped with a sequin sewing device and capable of performing sequin sewing and embroidery sewing in combination. According to the disclosure of Patent Literature 1, the sequin sewing device is provided on the left side surface of a needle bar case having a plurality of...

AI Technical Summary

Benefits of technology

"The present invention provides an improved sewing machine that can prevent abutment between a needle clamp and a movable blade when using a sequin needle bar, and can also reduce the necessary working time by allowing the sequin sewing device to move between an operative position and an evacuated position without deactivating the machine. This is achieved by providing a needle bar control section that inhibits or delays the descending movement of the needle bar while maintaining the machine in an operating condition. The needle bar control section can be a needle jump mechanism or a main machine shaft speed control device. The movement mechanism can move the sequin sewing device while the needle bar is in a jump state or while the operating speed of the main machine shaft is reduced. This prevents hitting or abutment between the needle clamp and the movable blade while also allowing the sequin sewing device to move between the operative and evacuated positions without deactivating the machine."

Problems solved by technology

When the sequin sewing device is to be vertically moved as well, the sewing machine is deactivated, because there is a possibility of the movable blade, moving together with the sequin sewing device, being damaged if the blade abuts against the needle clamp of the sequin needle bar.

Although the sewing machine disclosed in Patent Literature 1 can reduce the necessary working time by performing ordinary embroidery sewing, which uses with the same colored thread as in sequin sewing, by means of the sequin needle bar with the sequin sewing device kept in the lowered position, the needle clamp would undesirably abut against the sequin needle bar as the sequin needle bar descends because the embroidery sewing with the sequin needle bar is performed with the sequin sewing device kept in the lowered position.

Namely, the movable blade would be unnecessarily hit by the needle clamp and thus tends to be broken easily.

In addition, the unnecessary abutment between the needle clamp and the movable blade would result in greater noise sound of the sewing machine.

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