Method and device for coupling a cassette supported typewheel to a typewheel positioning shaft in typewriters or similar machines
US4820066A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 2, 1987 |
| Grant date | Apr 11, 1989 |
| Priority date | — |
| Expiry date | Mar 2, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J1/243
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A method for automatically coupling a typewheel rotatably mounted in a cassette to a typewheel positioning shaft. After the insertion of the typewheel supporting cassette into a typewriter or printer, a coupling sequence is initiated under the control of a microprocessor. During the coupling sequence the typewheel positioning motor is driven to turn a clutch part first in one and then in another direction by a certain angle causing coupling projections on the clutch part to engage corresponding coupling slots on the typewheel. During the coupling sequence, the typewheel is prevented from co-rotating unintentionally due to its moment of inertia and due to active frictional forces.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.