Electromagnetic line spacing device
US4255063A · kind A · utility
0Cited by
8References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 28, 1978 |
| Grant date | Mar 10, 1981 |
| Priority date | — |
| Expiry date | Jun 28, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F7/145
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A platen for a typewriter, is rotated intermittently by pulsing a winding to establish flux between poles of a stator and a rotor, which rotates through a fixed angle and then back to a datum position under the action of a spring. The magnetic flux also engages an electro magnetic clutch formed by the rotor and a part rotationally fast with the platen so that the platen is rotated only during the forward rotation of the rotor. The stator, rotor and said part are all coaxial with the platen and may be housed inside the platen.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.