Apparatus and method for pen-lift system
US4567565A · kind A · utility
14Cited by
11References
25Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 3, 1981 |
| Grant date | Jan 28, 1986 |
| Priority date | — |
| Expiry date | Nov 3, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D15/22
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A pen-lift system is provided which can achieve high speed plotting while maintaining line definition of drafting quality. The system includes a pen-lift mechanism for raising and lowering the pen, a pressure control system in order to provide a constant pen force for different kinds of pens, a velocity controller for varying the vertical velocity of the pen in response to changes in platen height and relative lateral pen position, and a position controller for sensing the present pen height relative to the platen and for actuating the pen-lift mechanism to achieve the desired pen-lift heights for different plotting situations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.