Spring-Loaded Round Platen
Original Publication Date: 1983-Sep-01
Included in the Prior Art Database: 2005-Feb-07
The illustrated impact printing assembly contains a spring-loaded platen and stationary backing plate which establish precise spacing between forms and an impact print head over a range of document thicknesses. The platen is driven by a belt linked to tractor feed mechanisms, allowing for combined sprocket and friction feeding of continuous forms documents, and also offering the option of handling cut forms documents with only friction feed (and without displacement of the tractors). Referring to Fig. 1, impact print head element 1 - typically, a wire matrix element - prints on documents 2 backed by round platen 3, by impelling an inked ribbon (not shown) against the document. Platen 3, loaded by action of spring 4, clamps various thicknesses of documents (from .003" to .025") against stationary guide plate 5 detailed in Fig.