US 4,619,294 A · Method of and apparatus for controlling motor-driven let-off and take-up system for looms

Abstract

Motor-driven let-off and take-up motions in a loom are controlled by controlling the rotation of a motor for driving warp yarns with a tension control system operating in response to a signal indicative of a target tension and a feedback input signal indicative of an actual tension of the object during a normal operation of the loom, and controlling the rotation of the motor with a feedforward control system during a transient operation of the loom, the feedforward control system storing operation patterns of directions, and speeds of rotation and angular displacement of the motor for respective operation modes and weaving conditions of the loom. At the time of the transient operation, and operating condition of the loom is detected, an appropriate operation pattern is read from the feedforward control system based on the detected operation mode, and the read operation pattern is applied as a control signal to a drive control system for the motor.

Claims5

Dependent claims

A method of controlling motor-driven let-off and take-up motions in a loom, comprising the steps of:

(a) controlling the rotation of a motor for driving an object with a tension control system operating in response to a signal indicative of a target tension and a feedback input signal indicative of an actual tension of the object during a normal operation of the loom;
(b) controlling the rotation of the motor with a feedforward control system during a transient operation of the loom, said feedforward control system storing operation patterns of directions and speeds of rotation and an angular displacement of the motor for respective operation modes and weaving condition of the loom;
(c) detecting an operation mode of the loom at the time of the transient operation;
(d) reading an appropriate operation pattern from the feedforward control system based on the detected operation mode;
and
(e) applying the read operation pattern as a control signal to a drive control system for the motor.

3 more elements

An apparatus for controlling let-off and take-up motions in a loom, comprising:

(a) a first control apparatus of a tension control system for controlling an object;
and
(b) a second control apparatus of a feedforward control system for controlling the object,
(c) said first control apparatus including:
(1) a tension setting unit for generating a signal indicative of a target tension for the object;
(2) a tension detector for detecting an actual tension of the object and generating a feedback signal;
(3) a PI control unit for effecting PI operation on the target tension signal and the feedback signal;
and
(4) a drive amplifier for controlling a motor for driving the object based on a PI output signal from said PI control unit, and
(d) said second control apparatus including:
(1) an input unit for entering operation data items of directions and speeds of rotation and an angular displacement of the motor for respective operation modes and weaving conditions of the loom;
(2) a memory for storing the operation data items from said input unit as a plurality of operation patterns;
(3) a detector for detecting an operating condition of the loom upon a transient operation of the loom;
(4) a central processing unit for reading an appropriate operation pattern dependent on the detected operating condition from said memory and generating a control signal;
and
(5) a drive control unit responsive to the control signal from said central processing unit for driving the motor based on a given speed pattern.

13 more elements

Dependencies are inferred from the claim text.

Method of and apparatus for controlling motor-driven let-off and take-up system for looms

Life of this patent

Method of and apparatus for controlling motor-driven let-off and take-up system for looms

Life of this patent

Abstract

Claims5