Multi-needle sewing machine thread cutting - cuts lower thread while needles are at bottom dead centre and upper threads when they are at top dead centre

摘要

To cut the upper and lower thread, in a sewing machine, the lower thread is severed when the needles are held at their lower dead centre position of its movement. The upper threads (1a) are cut together when the needles are held near their upper dead centre position of movement. The upper and lower threads are cut at the cylinder baseplate. The cylinder baseplate, with the needle plate, has an axial movement. A number of needles move vertically through the upper and lower sides of the needle plate, while a looper moves to and fro below the needle plate according to the vertical movement of the needles. A fixed blade is opposite a working end of the looper when it is retracted, and a second fixed blade is opposite the vertical movement path of the needles. ADVANTAGE - The technique gives an effective thread cutting action on an industrial multi-needle sewing machine with a covering chain stitch action, and a cylindrical baseplate, where the cuts threads are held securely