High accuracy vacuum belt and pinch roller media transport mecha

Details High accuracy vacuum belt and pinch roller media transport mecha High accuracy vacuum belt and pinch roller media transport mecha

1992-02-14

1993-03-30

Burr, Edgar S.

Typewriting machines

Sheet or web

Including friction-feed means

400645, 400617, 271197, 29DIG78, 198811, B41J 1308

Patent

active

051978121

ABSTRACT:
A media transport mechanism including a high accuracy vacuum belt used in conjunction with a pinch roller assembly. The media transport mechanism includes a vacuum belt supportably wrapped around two sprocket assemblies and a plenum and disposed in facing relation to a print head. The vacuum belt has two pinch roller assemblies disposed in spaced-apart relation across the front surface of the vacuum belt, with each pinch roller assembly including two pinch rollers which, in conjunction with the vacuum belt, grip and advance a sheet of media across the front surface of the vacuum belt during printing. The plenum provides a vacuum hold-down force for holding the media flat against the front surface of the vacuum belt.

REFERENCES:
patent: 3288037 (1966-11-01), Burnett
patent: 4237466 (1980-12-01), Scranton
patent: 4275978 (1981-06-01), Irwin
patent: 4302103 (1981-11-01), Zeunen
patent: 4326656 (1982-04-01), Gregory et al.
patent: 4463361 (1984-07-01), Koamura et al.
patent: 4792249 (1988-12-01), Lahr

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