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This mechanism allows a laterally traversing printhead to be operated at a fixed distance from the top sheet of varying thicknesses of multiple-copy forms paper rolled about a platen in an impact printer.
English (United States)
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Automatic Paper-Thickness Adjuster for Impact Printhead
This mechanism allows a laterally traversing printhead to be operated at a
fixed distance from the top sheet of varying thicknesses of multiple-copy forms
paper rolled about a platen in an impact printer.
The paper feed includes a pair of feed rolls 1 and 2 which are biased toward
the paper 3. Paper 3, of a thickness depending on the number of sheets and
carbons between the sheets, is wrapped about platen 4. The equal loading on
both feed rolls 1 and 2 is accomplished by guide 5 which is spring-loaded toward,
and contacts, the center of shaft 11 connecting feed rolls 1 and 2. Printhead 8,
mounted on carrier 9, is movable toward or away from paper 3 by the sliding
engagement of printhead 8 and rails 10 and 12 on carrier 9. Rigidly mounted to
printhead 8 is bar 7 which engages roller 6. Bar 7 is in continuous contact with
roller 6 as carrier 9 and printhead 8 traverse laterally across the print line. Since
the diameters of feed rolls 1 and 2 and roller 6 are fixed and the distance
between guide 5 and shaft 11 is fixed, the distance from printhead 8 to the top
sheet of paper 3 remains fixed, regardless of the thickness of the paper stack.
This mechanism provides a significant increase in printer speed by operating
at a fixed minimum print gap rather than at varying print gaps depending upon
the thickness of the stack of paper being printed.
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