Method and apparatus for controlling motor-driven let-off motion for looms
US4513790A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 13, 1984 |
| Grant date | Apr 30, 1985 |
| Priority date | — |
| Expiry date | Feb 13, 2004 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD03D49/10
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
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 p…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.