US 5,524,461 A · Control system for yarn feed gearbox

Abstract

A yarn feed gearbox control system for controlling the let-off speed of a yarn feed gearbox. The control system is adapted for use with a warp knitting machine having a main shaft and a gearbox operative to control the feed rate of yarn delivery from a yarn beam, the gearbox including an adjustment spindle extending therefrom. The control system includes a yarn feed rate detector which measures the rate of yarn delivery from the beam, a computer which receives yarn feed rate signals from the yarn feed rate detector and generates control signals corresponding thereto, and a control device which controls the speed of rotation of the spindle in accordance with the control signals. The control system may be further provided with a main shaft detector to measure the speed of rotation of the main shaft of the knitting machine. The control system may also be provided with a beam revolution detector to generate a revolution signal corresponding to each revolution of the yarn beam. Signals from the beam revolution detector may be utilized to control the actuation of an alarm and/or to stop the knitting machine. The yarn feed rate detector preferably includes a two roller assembly.

Claims20

Dependent claims

A yarn feed gearbox control system for controlling a let-off speed of a yarn feed gearbox, the gearbox operative to control a rate of yarn delivery from a yarn beam and including an adjustment spindle extending therefrom, said control system for use with a warp knitting machine having a main shaft and comprising:

a) a yarn feed rate detector operative to measure the rate of yarn delivery from the beam and generate yarn feed rate signals;
b) a computer operative to receive yarn feed rate signals from said yarn feed rate detector and to generate electrical control signals corresponding to said yarn feed rate signals;
c) a control device operative to control a speed rotation of the adjustment spindle in accordance with said control signals;
and
d) a beam revolution detector operative to generate a revolution signal corresponding to each revolution of the yarn beam.

2 more elements

A yarn feed gearbox control system for controlling a let-off rate of a yarn feed gearbox, the gearbox operative to control a rate of yarn delivery from a yarn beam and including an adjustment spindle extending therefrom, said control system for use with a warp knitting machine having a main shaft and comprising:

a) a yarn feed rate detector operative to measure the rate of yarn delivery from the beam and operative to generate yarn feed rate pulses at a rate proportional to the rate of yarn delivery from the beam;
b) a main shaft detector operative to generate main shaft speed signals at a rate proportional to a speed of rotation of the main shall of the knitting machine;
c) a computer operative to receive said yarn feed rate pulses from said yarn feed rate detector and to receive said main shaft speed pulses from said main shaft detector, said computer including a counter operative to count the number of main shaft speed pulses between respective yarn feed rate pulses, said computer operative to generate control signals corresponding to the value in said counter for each yarn feed rate pulse received from said yarn feed rate detector;
d) a control device operative to control a speed of rotation of the spindle in accordance with said control signals;
and
e) a beam revolution detector operative to generate a revolution signal corresponding to each revolution of the yarn beam.

3 more elements

Dependencies are inferred from the claim text.

Control system for yarn feed gearbox

Life of this patent

Control system for yarn feed gearbox

Life of this patent

Abstract

Claims20