Rotary electrical printer and method using dot-by-dot synchronization
US4203121A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 22, 1978 |
| Grant date | May 13, 1980 |
| Priority date | — |
| Expiry date | Mar 22, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D15/08
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The printer records images in the form of dots on electrical discharge-sensitive paper. Three groups of five styli are mounted on a rotor. The paper is in strip form and is fed continuously through a curved guide in a direction perpendicular to the plane of rotation of the rotor. Characters are formed from a 5 dot by 7 dot matrix. A disc is mounted on the same shaft and rotates with the rotor. This divisional patent is directed to the feature in which the disc has timing marks located around its edge with a spacing corresponding to the desired spacing between dots. The marks are detected and electronic circuitry produces corresponding timing pulses, one for every desired dot location. The paper feed mechanism is geared to the same drive shaft as the rotor. Thus, the formation of each dot is synchronized with the paper feed so that the printer can operate at a wide variety of speeds, and can start printing relatively soon after starting. Also, means are provided for varying the circumferential spacing of images by varying the dot count between successive images. Means also are included for providing a variable blank margin at the edge of each printed area on the paper.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.