Apparatus for measuring and controlling the amount of yarn withd

Details Apparatus for measuring and controlling the amount of yarn withd Apparatus for measuring and controlling the amount of yarn withd

1991-05-15

1992-10-06

Schroeder, Werner H.

Textiles: knitting

United needle machines

Straight

33734, 33778, D04B 2710

Patent

active

051521580

ABSTRACT:
An apparatus for measuring and controlling the amount of yarn withdrawn from the warp beam of a warp knitting machine is disclosed. A pressure roll engages the yarn wound on the warp beam. The pressure roll drives a second drive roll connected to a signal generator for generating signals representative of the speed of yarn withdrawn from the warp beam. The signals preferably are evenly spaced yarn length pulses representing a measure of the length of yarn withdrawn from the warp beam. The pulses are transmitted to a controller circuit which compares the generated pulses with a predetermined knitting machine operating standard and generates a control signal to the warp beam drive mechanism for controlling rotation of the warp beam. The drive roll preferably is manufactured with a wear-resistant surface and the diameter of the drive roll is dimensioned so that the evenly distributed yarn length pulses represent a yarn length corresponding to a fraction of a minimal racking movement of the yarn laying bars in the warp knitting machine.

REFERENCES:
patent: 2400525 (1946-05-01), Amidon
patent: 2674109 (1954-04-01), Bassist
patent: 2871685 (1959-02-01), Bassist
patent: 3539782 (1970-11-01), Upshur
patent: 3727033 (1973-04-01), Bassist
patent: 3781532 (1973-12-01), Dorsman et al.
patent: 3930523 (1976-01-01), Garcia

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