| 摘要 |
A seven color, single-pass thermal print engine includes three platen rollers equally spaced over a 180 degree arc, an uninterrupted length of receptor media which is received around the platens, three thermal printheads which make tangential contact with a respective platen, and a pair of output drive rollers for pulling the media around the platen rollers. The print engine further includes a media tensioning system consisting of a media tray, an "S" shaped media guide with an idler roll mounted inside the curve of the "S", a tensioning arm for applying tangential pressure to the receptor media and a pair of input pinch rollers. Color transfer ribbons surround each printhead and are contained in re-loadable cassettes. The platens, pinch rollers and tensioning assembly are mounted on a slide assembly so that the platen rollers, the pinch rollers and the tensioning system can be slidably withdrawn from the print engine for receptor media loading and ribbon cassette replacement.
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