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Printhead Spacing Adjustment for Paper Thickness

IP.com Disclosure Number: IPCOM000046812D
Original Publication Date: 1983-Aug-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Rex, DK: AUTHOR

Abstract

In impact printers the spacing of the print element relative to the ribbon and paper is important for producing uniform print quality and avoiding damage to the ribbon and/or print element (particularly in wire-matrix-type printers). In many printers a manual adjustment is required to adapt the spacing for different thicknesses of paper. This is subject to operator error, either failure to set the adjustment or improper adjustment due to faulty judgment. The arrangement described here provides automatic and accurate spacing adjustment. In the illustrated arrangement, printhead carrier 1, carried on rod 2 relative to paper 3 and a ribbon (not shown) (for establishing character printing positions), positions printhead/element 4 for printing characters serially on the paper. The paper is backed by platen 5.

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Printhead Spacing Adjustment for Paper Thickness

In impact printers the spacing of the print element relative to the ribbon and paper is important for producing uniform print quality and avoiding damage to the ribbon and/or print element (particularly in wire-matrix-type printers). In many printers a manual adjustment is required to adapt the spacing for different thicknesses of paper. This is subject to operator error, either failure to set the adjustment or improper adjustment due to faulty judgment. The arrangement described here provides automatic and accurate spacing adjustment. In the illustrated arrangement, printhead carrier 1, carried on rod 2 relative to paper 3 and a ribbon (not shown) (for establishing character printing positions), positions printhead/element 4 for printing characters serially on the paper. The paper is backed by platen 5. The upper part 6 of the carrier is slidably supported on the lower part 7 and urged by spring 8 towards the paper. Eccentric 9 is rotatable by means (not shown) to tilt the lower part of the carrier, around the axis coinciding with the center of rod 2, for causing the "stop" projection 10 to move towards and away from the paper. When the stop projection is moved away from the paper, it contacts the part 6 and displaces it away from the paper. When the stop projection is moved towards the paper, the motion of part 6 is halted when roller 11 contacts the paper at an area backed by the platen. Roller 11 establishes th...