Browse Prior Art Database

Automatic Paper-Thickness Adjuster for Impact Printhead

IP.com Disclosure Number: IPCOM000046345D
Original Publication Date: 1983-Jul-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Floyd, RK: AUTHOR [+2]

Abstract

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.

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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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