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Observation system on textile machines, for detection of interruptions in moving slivers

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  • Title:
    Observation system on textile machines, for detection of interruptions in moving slivers
  • Subjects: CONVEYING ; HANDLING THIN OR FILAMENTARY MATERIAL ; HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS,CABLES ; MEASURING ; MEASURING ELECTRIC VARIABLES ; MEASURING MAGNETIC VARIABLES ; NATURAL OR ARTIFICIAL THREADS OR FIBRES ; PACKING ; PERFORMING OPERATIONS ; PHYSICS ; SPINNING ; SPINNING OR TWISTING ; STORING ; TESTING ; TEXTILES ; TRANSPORTING
  • Description: 1,131,008. Capacitive sensors. LUWA A. G. June 2, 1967 [June 2, 1966], No.25656/67. Heading G1N. [Also in Division D1] Discontinuities such as breaks or fragmented pieces in a fibre strand (30, Fig. 2, not shown) are detected by a capacitance transducer 21, Fig. 1, the value of which is varied by making the strand form part of the dielectric, or by making its discontinuities strike one of the plates of the capacitor to deflect it, the capacitance variations being used to vary the bias on the gate G of a F.E.T. 10 the output 22 of which is amplified and indicated by means not shown. The F. E, T. circuit, which may be connected to a plurality of measuring capacitors, includes a feedback capacitor C19; and also an input capacitor C17 which with a bias resistor R15 constitutes a time constant rendering the circuit responsive only to signals above a certain frequency and magnitude. The circuit thus responds to series of pulses due to breaks or other discontinuities of substantial size in the strand, but not to occasional or slow capacitance variations due to minor causes such as suspended fibre particles and fluffy lumps. Breakage of a strand (30) approaching a rotating flyer (34) is detected by placing the sensing capacitor (44) in a suction channel (41) which through a pipe (40) sucks in the broken ends or fragmented pieces of the strand until they affect the capacitor. Breakage near the outlet of a container (31) feeding the strand (30) is detected by placing a further capacitor transducer (21a) where it will be contacted by a sag (30') in the strand if it breaks. Accumulation of fluff (52, Fig. 3, not shown) at the flyer (54) is detected by another transducer (21b).
  • Creation Date: 1968
  • Language: English
  • Source: esp@cenet
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