NEEDLE MONITORING DEVICE FOR CIRCULAR KNITTING MACHINES
1350512 Knitting machines E SICK [trading as ERWIN SICK] 24 Feb 1972 8597/72 Heading D1C A needle monitoring device for circular knitting machines comprises a needle counting device which produces a different signal according to whether a preset number has been reached or not and a feeler 2 for detecting the start and finish of a machine revolution, which signal, combined with the signal indicating that the preset number has not been reached, produces a warning signal. Feeler 2 delivers a signal 'O' during each revolution interrupted by a signal 'L' at the moment between revolutions. Photoelectric leads 3, 4 detect the rib and cylinder needles and the impulses resulting are counted by counter 5 which emit a signal 'L' until it reaches a total corresponding to the total number of needles which should be present in the machine when it emits a signal 'O'. The signals are combined by an AND-gate.