| 摘要 |
PCT No. PCT/SE85/00491 Sec. 371 Date Jul. 17, 1986 Sec. 102(e) Date Jul. 17, 1986 PCT Filed Nov. 27, 1985 PCT Pub. No. WO86/03233 PCT Pub. Date Jun. 5, 1986.An apparatus for monitoring one or more threads in a sewing machine with a number of sewing heads, the signal emitter including a spring arm (2) which is fixedly anchored at its one end (3) and, at its opposite end, carries a magnet (9), this opposite end being moreover located in the path of movement of the lower thread (12) in order to be influenced by same and thereby change the position of the magnet (9) in relation to an element (10) sensitive to the position of the magnet (9) and generating an electric signal in dependence upon the position of the magnet (9), the signal change being sensed and evaluated. |
