DROP-ON-DEMAND PRINTING APPARATUS AND METHOD OF MANUFACTURE THEREOF

摘要

The invention describes a method of forming a drop-on-demand printingapparatus having a body formed with a high den-sity array of parallel channels (13) extending normal to the array direction,nozzles (27) connected respectively with the channels,printing liquid supply means with which said channels each communicate andpressure pulse applying means provided with eachchannel to apply pressure pulses to the channel liquid to effect dropletejection, in which the body is formed by a plurality of likemodules (2) serially butted together at facing end surfaces (49, 51) which arenormal to the array direction, the arrangement en-abling ejection of droplets from the channels so that said droplets aredeposited on a printing surface at a predetermined spacingtransversely to the direction of relative movement between the appratus andsaid surface.