公开(公告)号：US3404766A

公开(公告)日：1968-10-08

申请号：US58027566

申请日：1966-09-19

Applicant: IBM

Inventor： CASTLE WILLIAM H ,  JONES JOHN E ,  RAHENKAMP ROBERT A

IPC: B41J19/58

CPC classification number: B41J19/58

公开(公告)号：US3592313A

公开(公告)日：1971-07-13

申请号：US3592313D

申请日：1968-07-15

Applicant: IBM

Inventor： CASTLE WILLIAM H ,  GREER DONALD L

IPC: B41J5/22 ,  B41J25/08 ,  B41J25/24

CPC classification number: B41J5/22 ,  B41J25/08

Abstract: An encoding keyboard constructed like that disclosed in U.S. Pat. No. 3,086,635, entitled ''''Keylever Storage Mechanism,'''' issued Apr. 23, 1963, to Leon E. Palmer is provided with a novel dual keylever construction that properly time-sequences up and down shift code entries with respect to character entries. The stroke storage provided in the keyboard of U.S. Pat. No. 3,086,635 is expanded to provide storage for two characters, when necessary, to accommodate the characteristically rapid and arhythmic, three-stroke sequence, ''''upshift-print-downshift.