Detection of defective knitting needles of a knitting machine

Details Detection of defective knitting needles of a knitting machine Detection of defective knitting needles of a knitting machine

1974-09-17

1976-03-30

Feldbaum, Ronald

Textiles: knitting

Stopping

250224, D04B 1508

Patent

active

039465780

ABSTRACT:
A method and apparatus for detecting defective knitting needles in a circular knitting machine wherein the knitting needles are advanced along a circular path between a light source and upper and lower vertically spaced photoelectric detector devices. The direction of the light beams from the source to the two photoelectric devices is inclined at an angle to the tangent of the circular path at the beam intercept with the circular path, such that the advancing needles pass successively through the beams and a shadow of the hook end of each needle is cast on the upper photoelectric device before any shadow of any other part of the needle is cast on the lower photoelectric device, when a nondefective intact needle enters the beams. Needles with broken off hooks or closed needle latches cause a shadow to be cast on the lower photoelectric device before any shadow reaches the upper photoelectric device to activate an alarm and/or stop the knitting machine. A third photoelectric device may be positioned to receive a shadow of a different needle from the one being inspected by the upper and lower photoelectric devices to detect needles broken off too low to cast a shadow on the lower photoelectric device.

REFERENCES:
patent: 3529445 (1970-09-01), Brose
patent: 3577750 (1971-05-01), Venczel
patent: 3646342 (1972-02-01), Anthony
patent: 3659437 (1972-05-01), McArthur et al.
Brose, "Fault Detection on Circular Knitting Machines", Hosiery Trade Journal, Vol. 76, No. 906, June 1969, (pp. 89-92).
Schwade, "Photoelektrische Warenkontrollean Doppelzylindr Automaten, Wirkerei-und Strickerei-Technik," Oct. 1964, Nr. 10, pp. 478-481.

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