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Control Algorithm for Improved Print Registration

IP.com Disclosure Number: IPCOM000060211D
Original Publication Date: 1986-Mar-01
Included in the Prior Art Database: 2005-Mar-08

Publishing Venue

IBM

Related People

Authors:
Akers, AL Cronch, DD Fisher, RT Graham, PA Komplin, SR Passafiume, JE [+details]

Abstract

Print registration is improved through controlling the effect on character placement of variations in selection, ribbon, and hammer timing with respect to escapement by use of a control algorithm. In some daisywheel print mechanisms, the ribbon move time, as well as the selection move time, may be greater or lesser than the escapement move time. The print hammer time also may vary according to impression force with this being significant if the impression forces required for correction and printing are different. A control algorithm accounts for all these variations by fixing the time from the "end point" of each of the moves to the "hammer impact point" at a constant value.