Textiles: weaving – Warp manipulation – Feeding
Patent
1984-02-13
1985-04-30
Jaudon, Henry S.
Textiles: weaving
Warp manipulation
Feeding
242 7544, 242 7551, D03D 4910
Patent
active
045137900
ABSTRACT:
A method of controlling a motor-driven let-off motion in a loom including a system for controlling a let-off motion motor includes the steps of sampling a variation of warp tension during each revolution of a main shaft of the loom, effecting at least proportional and integral control modes on the average of sampled values, adding a proportional and integral output to a basic speed signal at a prescribed ratio, and applying a sum signal to the system for controlling the let-off motion motor. An apparatus for controlling a motor-driven let-off motion in a loom including a system for controlling a let-off motion motor includes an average computing unit for computing the average of warp tension variations detected at a plurality of sampling times while a main shaft of the loom revolves, a control unit for effecting at least a proportional and integral computation on the average to produce a proportional and integral output, a basic speed computing unit responsive to information indicative of the number of RPM of the main shaft of the loom, the diameter of warp coils on beams, and the number of beatings for computing a basic speed, and a speed command computing unit responsive to the proportional and integral output and the basic speed for adding the proportional and integral output to the basic speed at a prescribed ratio to generate a speed command signal and for applying the speed command signal to the system for controlling the let-off motion motor. With this arrangement, there is no time-delay element in the control system and hence any tension variations can be detected quickly. When the loom is stopped in operation, the integral of a warp tension prior to the stoppage of the loom is stored. When the loom is restarted, the stored integral is issued to suppress any unwanted tension variations of the warp yarns. Since a tension compensation gain is not relatively varied when the diameter of a warp coil is changed, the control system can provide ideal control characteristics.
REFERENCES:
patent: 3878872 (1975-04-01), Hintsch
patent: 4151594 (1979-04-01), Stern
patent: 4199118 (1980-04-01), Tetro
patent: 4407331 (1983-10-01), Rehling
patent: 4407462 (1983-10-01), Tajima
Fujita Yoshitaka
Imai Toshiki
Sainen Tsutomu
Sakano Toshiyuki
Jaudon Henry S.
Shongut S.
Tsudakoma Corp.
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