Optical scanning apparatus for xerographic printers

Claim 1

AN OPTICAL SCANNING APPARATUS FOR PROJECTING AN IMAGE OF COPY TO BE REPRODUCED ONTO A MOVING LIGHTRECEIVING SURFACE SAID OPTICAL SCANNING APPARATUS INCLUDING A FRAME MEANS, A COPY CARRIAGE ASSEMBLY MOVABLY MOUNTED ON SAID FRAME MEANS SAID CARRIAGE ASSEMBLY INCLUDING A GUIDE MEANS, A COPY HOLDER FOR SUPPORTING COPY TO BE REPRODUCED RELEASABLY MOUNTED ON SAID CARRIAGE ASSEMBLY BY SAID GUIDE MEANS, ILLUMINATING MEANS POSITIONED ON SAID FRAME MEANS TO ILLUMINATE COPY SUPPORTED BY SAID COPY HOLDER ON SAID COPY CARRIAGE ASSEMBLY, A ROTATABLE MEMBER ADAPTED TO SUPPORT A LIGHT-RECEIVING SURFACE FOR MOVEMENT THROUGH A PREDETERMINED PATH CONTIGUOUS TO SAID ROTATABLE MEMBER, DRIVE MEANS CONNECTED TO SAID ROTATABLE MEMBER FOR MOVING A LIGHT-RECEIVING SURFACE CARRIED BY SAID ROTATABLE MEMBER AT A PREDETERMINED SPEED, A LIGHT SHIELD INTERPOSED IN THE OPTICAL PATH BETWEEN SAID COPY CARRIAGE ASSEMBLY AND SAID ROTATABLE MEMBER, A SLOT APERTURE IN SAID SHIELD EXTENDING TRANSVERSELY TO THE PATH OF MOVEMENT OF SAID ROTATABLE MEMBER, LENS MEANS POSITIONED TO DIRECT A RADIATION IMAGE FROM COPY SUPPORTED BY SAID COPY HOLDER THROUGH SAID SLOT APERTURE ONTO A LIGHT-RECEIVING SURFACE, CARRIAGE DRIVE MEANS OPERATIVELY CONNECTED TO SAID DRIVE MEANS AND SAID COPY CARRIAGE ASSEMBLY FOR MOVING SAID COPY CARRIAGE ASSEMBLY AT A PREDETERMINED SPEED RELATIVE TO SAID ROTATABLE MEMBER FROM A START-OF-SCAN POSITION TO AN END-OF-SCAN POSITION, AND A LENTGH OF SCAN CONTROL MEANS MOVABLE WITH RESPECT TO SAID COPY CARRIAGE ASSEMBLY FOR CONTROLLING THE START-OF-SCAN POSITION AND THE END-OF-SCAN POSITION OF SAID COPY CARRIAGE ASSEMBLY.