公开(公告)号：JPS6328659A

公开(公告)日：1988-02-06

申请号：JP17406387

申请日：1987-07-14

Applicant: IBM

Inventor： APPLEGATE STEVEN LEWIS ,  BARTLETT JOHN CROCKETT ,  DAMON BRIAN WESLEY ,  HOLCOMB DAVID WAYNE ,  RAVITZ CARY PATTERSON

IPC: B41J2/51 ,  B41J2/255 ,  B41J2/325 ,  B41J2/425 ,  G06K15/10

公开(公告)号：DE3772288D1

公开(公告)日：1991-09-26

申请号：DE3772288

申请日：1987-06-30

Applicant: IBM

Inventor： APPLEGATE STEVEN LEWIS ,  BARTLETT JOHN CROCKETT ,  DAMON BRIAN WESLEY ,  HOLCOMB DAVID WAYNE ,  RAVITZ CARY PATTERSON

IPC: B41J2/51 ,  B41J2/255 ,  B41J2/325 ,  B41J2/425 ,  G06K15/10 ,  B41J2/23

Abstract: Wear on the elements (5) of a printhead (3) is spread by shifting the region use of the printhead line by line. Font (13) provides information as to whether any character in a line employs the upper three pels or the bottom three pels of a line. For each line which can be printed from different shift positions of the printhead, selection logic controls paper feed (15) to index platen (9) to the least used of a shifted position of printhead. Only those electrodes over the print line in each shifted position are used for printing. This distributes wear without requiring any special ribbon feed. The three pel height is at least as wide as the serifs on most characters, which avoids some electrodes being used for the serifs of given characters in more than one shift position.