Selective rotary print member

Claim 1

IN A PRINTING MECHANISM: A PRINTING WHEEL INCLUDING AN ARCUATE PRINT SECTOR COMPRISING A GROUP OF PRINTING TYPES DISPOSED CIRCUMFERENTIALLY RELATIVE TO THE LONGITUDINAL AXIS OF SAID WHEEL, ANY ONE OF SAID TYPES BEING ADAPTED TO BE SELECTED FOR PRINTING ON A RECORD MEMBER AT A PRINTING POINT; MOVEMENT CONTROL MEANS FOR CONSTRAINING SAID PRINTING WHEEL TO ROLL ALONG AN INVARIABLE PATH SUCH THAT THE PATH ALONG WHICH SAID GROUP OF PRINTING TYPES ROLLS IS SUBSTANTIALLY TANGENT TO SAID RECORD MEMBER AT SAID PRINTING POINT, SAID MOVEMENT CONTROL MEANS INCLUDING MEANS FOR CAUSING SAID WHEEL TO ROLL BODILY ALONG SAID PATH INCLUDING SAID PRINTING POINT WHILE ROTATING ABOUT ITS LONGITUDINAL AXIS, SO THAT SAID WHEEL AS A WHOLE, INCLUDING ITS LONGITUDINAL AXIS, MOVES IN THE COURSE OF SUCH ROLLING MOVEMENT; AND SELECTION MEANS FOR CAUSING ANY SELECTED ONE OF SAID PRINTING TYPES TO ROLL ON SAID RECORD MEMBER AT SAID PRINTING POINT; SAID PATH BEING UNCHANGED IRRESPECTIVE OF THE CONTROL EXERCISED BY SAID SELECTION MEANS.