Vorrichtung und Verfahren zur ueberwachten Fadenfuehrung in einer Strickmaschine

Abstract

DE 102005050126 B3 UPAB: 20070517 NOVELTY - In a monitored thread guiding device in a knitting machine, in which a thread is guided under tension along a free thread transport zone, having thread supply unit(s), a receiving unit and an optical sensor unit for contact-free detection of thread in the transport zone, sideways oscillation of the thread from its path is caused along the transport zone. DETAILED DESCRIPTION - A monitored thread guiding device in a knitting machine, in which at least one thread is guided under predetermined tension along a free thread transport zone, has unit(s) for supplying the thread along the zone and a unit for receiving and/or further guiding the tensioned thread. An optical sensor unit, for contact-free detection of thread in the transport zone, generates a control or regulation signal for the thread supply and/or receiving unit(s). The novel feature is that a device for causing sideways oscillation of the thread from its path is provided along the transport zone. An INDEPENDENT CLAIM is included for a corresponding monitored thread guiding process, in which controlled transverse oscillations are induced in the thread in the transport zone, optical detection of a consequent dynamic sensor signal is used to indicate an undamaged thread and lack of detection of such a signal is used to detect a broken thread, in which case operation of the knitting machine is halted. USE - For monitored guiding of thread in a knitting machine, especially a circular knitting machine. ADVANTAGE - Guiding of the threads is effectively monitored (especially as regards thread tension) while avoiding additional wear on the knitting machine side components (including the thread itself), so that the need for expensive and time-consuming maintenance operations is eliminated. Constant thread quality is ensured, especially so that threads of low (specifically non-optically resolvable) roughness are obtained. Yarn guiding within several thread guides can be individually monitored, so that a higher quality knitted product is obtained. The thread tension can be regulated in individual thread guides