Digital control system
US3973174A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 26, 1974 |
| Grant date | Aug 3, 1976 |
| Priority date | — |
| Expiry date | Dec 26, 1994 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65H23/06
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A digital control system for regulating the speed of a running web roll so as to maintain uniform tension in the web measures the speed of the running roll with a first tachometer and measures the speed of a fixed diameter roll in control with the web with a second tachometer. A resettable counter is incremented by the pulses from the second tachometer and is reset by the pulses from the first tachometer so that the contents of the counter are indicative of the amount of web having traveled over the fixed diameter roll during the time in which the running roll has rotated through a selected angle. The contents of the counter are then used to control the torque applied to the running roll.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.