Servoing System for Hammer for Dot Drum Helix
Original Publication Date: 1986-Feb-01
Included in the Prior Art Database: 2005-Mar-08
A technique is described for adjustment of firing time to compensate for drum speed variation and flight-time variations. As a high speed printer, the dot drum helix must have accurate controlled firing of the print hammer relative to the dot on the drum. For example, at a drum speed of 100 inches/second, a firing error of 10 microseconds causes a misplaced print dot on the paper of 0.001 inch.