Dual segment continuous motion ribbon feed mechanism
US4131374A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 18, 1977 |
| Grant date | Dec 26, 1978 |
| Priority date | — |
| Expiry date | Aug 18, 1997 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J33/28
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A ribbon feed mechanism for typewriters operable to incrementally feed a ribbon with a dual segment continuous motion ribbon feed. The ribbon is advanced an initial segment by a power actuated linkage and advanced a final segment by a spring urged arm acting on a multi-toothed cam. The initial segment feed occurs when a bellcrank is pivoted, and through a linkage, urges a ribbon metering shaft to rotate which, in turn, feeds the ribbon. Simultaneously, a spring biased cam follower is gradually displaced by the multi-toothed cam which is supported on the metering shaft. The final segment feed occurs as the spring biased cam follower is rapidly displaced down a cam surface of a tooth on the multi-toothed cam.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.