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    WRAPAROUND RIBBON PRINTHEAD ASSEMBLY FOR A PRINTING MECHANISM
    13.
    发明专利
    WRAPAROUND RIBBON PRINTHEAD ASSEMBLY FOR A PRINTING MECHANISM 未知

    公开(公告)号：DE3167032D1

    公开(公告)日：1984-12-13

    申请号：DE3167032

    申请日：1981-04-10

    Applicant: IBM

    Inventor： APPLEGATE STEVEN LEWIS ,  MOLLOY JAMES JOHN

    IPC: B41J2/24 ,  B41J2/325 ,  B41J2/335 ,  B41J25/304 ,  B41J33/02 ,  B41J33/38 ,  B41J35/04 ,  B41J35/06 ,  B41J33/00

    Abstract: Printhead assembly for a printing mechanism of the kind that swipes a printhead (109) along a ribbon (116) in producing marks on a receiving medium (106) mounted to pivot and includes a ribbon guide (36) that serves to wrap the ribbon around the trailing side of the printhead (10). The assembly is positioned to permit the printhead (10) to be rotated to a normal printing position at a printing line. By so arranging the ribbon path that the ribbon directions for arrival and departure of the assembly intersect the pivot axis, essentially zero resultant torque may be applied to the assembly by ribbon tension forces and the printing pressure at the receiving medium is, accordingly, unaffected by ribbon tension variations.

    14.
    发明专利
    未知

    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.

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