刺繍ミシンにおける縫糸切断機構

概要

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The mechanism of needle thread breakage during machine embroidering was investigated using a lotus pattern. Polyester embroidery thread with a higher twist is more difficult to break. Embroidery threads such as acrylics which break easier are made stronger through processing by which paraffin is added. When compared to lighter colored threads such as beige and white, darker colored threads such as black and purple showed a tendency to break more easily. The cause of thread breakage was investigated through analysis of needle thread tension wave profiles. There are two scenarios whereby a thread becomes broken. The first is estimated from the disorder of the needle thread tension wave profile. It is thought that first the thread becomes untwisted, allowing a portion of the needle thread to get caught and broken by the hook of the hook race which ultimately results in the entire thread becoming severed. The other thread breakage scenario is implicated by the disappearance of the peak tension from the needle thread tension wave profile. As the tip of the needle passes through fabric that has already been embroidered with multiple layers of thread, the needle thread is pulled taut and prevented from entering the fabric to cause the thread to break. In such cases, only a short amount of thread is left remaining on the underside of the fabric.
実践女子大学の論文
2007-03-29