公开(公告)号：CA1200431A

公开(公告)日：1986-02-11

申请号：CA425601

申请日：1983-04-11

Applicant: IBM

Inventor： LEAN ERIC G-H ,  PENNINGTON KEITH S ,  TSENG SAMUEL C-C ,  WANG HAN C

IPC: B41J2/495 ,  B41J2/31 ,  B41J2/485 ,  B41J2/50 ,  B41J3/10

Abstract: The present invention relates to a dot matrix printer which makes use of multiple dot patterns distributed on the cylinder, belt, hand or drum of a line printer to provide an improved printing throughput for an all addressable line printer. In a dothelix matrix printer, different arrangements of the dots are used which can be varied in position and spacing to increase printing speed. On a belt, band or drum line printer, multiple dot patterns are given a predetermined distribution. More specifically, arrangements of dots are used which provide enhanced performance due to the fact that they are determined by an analysis of the statistical occurrence of a particular dot pattern in a character set. The higher statistical probability dot patterns are used more often on the belt, band or drum.

公开(公告)号：CA1148101A

公开(公告)日：1983-06-14

申请号：CA361865

申请日：1980-09-10

Applicant: IBM

Inventor： CUOMO JEROME J ,  LANDON ALFRED J ,  WANG HAN C

IPC: B41J9/40 ,  H02N13/00 ,  F16D13/10

Abstract: An electrostatic clutch operable by the Johnsen-Rahbek effect, which may be used to operate, e.g., a print hammer device, is described, said clutch comprising a rotatable drum and a band engagable therewith, wherein the engagable surface of the drum is a semiconductive surface prepared by sputtering or vapor depositing a layer of substantially pure silicon carbide onto a conductive substrate. YO979-038