| 摘要 |
PCT No. PCT/EP87/00336 Sec. 371 Date Feb. 26, 1988 Sec. 102(e) Date Feb. 26, 1988 PCT Filed Jun. 25, 1987 PCT Pub. No. WO88/00257 PCT Pub. Date Jan. 14, 1988.A monitoring circuit for a knitting machine with at least one yarn feeding arrangement comprises two yarn monitoring devices which are provided with switches and connected via a first rectifier circuit and an indicating lamp to a supply line. The supply line is coupled to a supply voltage source in such a way that when one of the two yarn monitoring devices is operated, the indicating lamp is only activated by one half-wave which is associated with the yarn monitoring devices and belongs to an a.c. voltage signal generated by the supply voltage source. To improve the recognizability of an indication by the indicating lamp, the a.c. voltage signal generated by the supply voltage source has a first interval during which the signal has exclusively positive half-waves and a second interval during which the signal has exclusively negative a.c. voltage half-waves.
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