Tufting machine broken yarn detector

Sewing – Elements – Starting or stopping

Patent

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Details

112278, B65N 6300, B65N 6936, D05B 5100

Patent

active

045221391

ABSTRACT:
A tufting machine has a broken yarn detector mounted intermediate the yarn feed mechanism and the needles, the detector having a multiplicity of yarn engaging fingers pivotably mounted in a support housing secured to a frame carried by the tufting machine. Each finger has an eyelet for receiving a strand of yarn which during normal operation of the tufting machine supports the finger in a raised position, but which drops when the yarn is broken. A signal generator and a signal receiver in the form of a light source and a photo-conductive receiver respectively are carried by the frame of the broken yarn detector at a disposition such that when a finger drops it interrupts the transmission of the light beam from the transmitter to the receiver to provide a signal which may be used to stop the tufting machine. The housing of the broken yarn detector supports a lifting member which may be raised to lock all the fingers in a raised position for threading of yarn therethrough and may be lowered during normal operation of the tufting machine and yarn detector. The frame also carries a support member for supporting selective non-threaded fingers in a remote position when such fingers are not being utilized.

REFERENCES:
patent: 3429146 (1969-02-01), Cvach
patent: 3530690 (1970-09-01), Nickell et al.
patent: 3752997 (1973-08-01), MacKenzie et al.
patent: 4100425 (1978-07-01), Ohsawa
patent: 4364247 (1982-12-01), Muns-Magem et al.
patent: 4444132 (1984-04-01), Breitbach

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