Apparatus for controlling motor-driven let-off motion for looms
US4529012A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 13, 1984 |
| Grant date | Jul 16, 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
An apparatus for controlling a let-off motion in a loom having a let-off motion motor includes a tension detector for detecting a warp tension to produce a tension correction signal, a control unit responsive to the tension correction signal for producing a speed signal, a driving amplifier for controlling the let-off motion motor in response to the speed signal, a warp coil diameter detector for issuing a warp coil diameter correction signal inversely proportional to the diameter of a warp coil on a beam to the driving amplifier, and a normal-reverse rotation control unit responsive to the warp coil diameter correction signal for selectively applying prescribed normal- and reverse-rotation signals dependent on a rotation command to the driving amplifier. With this arrangement, the motor is rotated at a desired constant speed for feeding out or rewinding the warp yarn for a desired length irrespectively of the warp coil diameter. In an inching mode of operation, the motor is rotated in a normal or reverse direction for an interval equivalent to one pick each time a main shaft of the loom turns past a certain rotational angle, so that the warp yarn is kept under a desired tension.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.