Recording apparatus having a tapered roller platen for exerting a uniform pressing force against recording elements
US4728967A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 20, 1985 |
| Grant date | Mar 1, 1988 |
| Priority date | — |
| Expiry date | Nov 20, 2005 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J11/04
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A recording apparatus and, more particularly, a so-called thermal printer employs a thermal head as a recording head. A platen roller is in pressing engagement with the recording head and recording elements pass between the two. Biasing forces exerted on opposite ends of the recording head cause it to deform slightly. To accommodate for this deformation, the diameter of the platen roller is greater in the middle than at its opposite ends. This construction assures that both the recording head and the platen roller are pressed against each other under a uniform force, so that ink density irregularity on the recording paper, creasing of the recording paper and the ink sheet, and recording density irregularity resulting therefrom can be prevented, and thus stable recording performance can be assured.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.