Type wheel for serial printing apparatus
US4335970A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 24, 1980 |
| Grant date | Jun 22, 1982 |
| Priority date | — |
| Expiry date | Jun 24, 2000 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J1/30
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Each of resilient tongues of a type wheel for use in a serial printing apparatus carries one or more type members. Each of the type members is provided with a curved or concave type face whose center of curvature lies on an axis of a paper supporting platen so that the type face comes into even and tight contact with the platen surface in a printing position. The curved type face is formed on a projection having a forward end which is tapered toward or away from a plane perpendicular to a rotary axis of the type wheel. Further, the each of the type members is provided with a back face which is formed on a back portion of the curved type face. The back face is driven by a hammer which is oriented in a predetermined direction toward the axis of the platen so as to be evenly and entirely engaged with a striking face of the hammer in the printing position. The back portion of the curved type face comprises a projection which is tapered toward or away from a plane perpendicular the rotary axis of the type wheel. The back face is so inclined as to be parallel to a direction perpendicular to the predetermined direction of the hammer in the printing position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.