Velocity-position servo with improved gain control
US4551664A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 27, 1983 |
| Grant date | Nov 5, 1985 |
| Priority date | — |
| Expiry date | Sep 27, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B2219/45187
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
In a rotary printer control system, a dual mode servo for controlling the velocity and position of a rotary print wheel and a print wheel carriage is normally operated at a relatively high gain value. When the servo is switched from the velocity mode to the position mode, the length of time the servo remains in the position mode is monitored and, if this exceeds a predetermined maximum time period, the gain of the servo loop is switched to a relatively low value in order to reduce oscillations of the print wheel or carriage about the HOME position. The gain reduction is accomplished by inserting a supplemental R-C network in parallel with the high gain R-C network, and the range or ratios of the relatively high gain to the relatively low gain values is from about 10 to about 30.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.