Decoding means for use with a typewriter
US3972403A · kind A · utility
Inventors
Key dates
| Filing date | Sep 5, 1974 |
| Grant date | Aug 3, 1976 |
| Priority date | — |
| Expiry date | Sep 5, 1994 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J3/51
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Apparatus for attachment to a standard typewriter for selectively actuating one or more of a plurality of magnetically actuated switches in electrical circuits that are connected to recording means through an electrical matrix circuit. A switch and actuating lever are provided for each of the unique keys of the typewriter so that signals identifying the corresponding character or function can be produced. The apparatus is compact and can be easily installed beneath the keyboard under the typewrter. Pivotable actuating levers having magnets thereon move into close proximity to the magnetically actuated switches in response to striking of the typewriter keys. The apparatus also includes magnetic shielding for preventing a lever from actuating more than one switch, even though the switches can be in extremely close proximity to one another.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.