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.

公开(公告)号：DE3463473D1

公开(公告)日：1987-06-11

申请号：DE3463473

申请日：1984-08-10

Applicant: IBM

Inventor： BARTLETT JOHN CROCKETT ,  BOHNHOFF ALAN EARL ,  CROLEY DONALD FRED ,  DYER STANLEY ,  EDDS KENNETH EUGENE ,  HORLANDER FRANK JAMES ,  STAFFORD DONALD WAYNE

IPC: B41J2/325 ,  B41J29/36 ,  B41J29/373 ,  B41M5/26 ,  B41J3/20

Abstract: Ribbon (22) in thermal printing has an outer layer which adheres to printed characters at intermediate temperatures, lower than printing temperatures. The printhead (7) has a column of electrodes (9) which sweep across the character area. Lift-off is accomplished by the pattern control (40) controlling the current source (38) to provide rapid, square wave pulses displaced in phase 180 degrees at adjoining electrodes (9). The high level of the pulses is about that of the level at printing, and the pulses are sufficiently rapid so that their net effect is to raise the outer layer ribbon (22) to the intermediate temperature. At areas corresponding to underlines of characters, duration of the up period is longer. Good, long term reliability is achieved by the significant erase level being very close to the print level.