Xerographic reproducing apparatus

Claim 1

IN A XEROGRAPHIC PRINTER FOR REPRODUCING COPY, A PROJECTION APPARATUS TO PROJECT OPAQUE ORIGINAL IMAGES TO BE REPRODUCED AT VARIABLE PRE-SELECTIVE MAGNIFICATION RATIOS ONTO A XEROGRAPHIC PLATE MOVING NORMAL TO AN EXPOSURE SLIT AT CONSTANT RATE, WHEREIN SAID XEROGRAPHIC PRINTER INCLUDES A XEROGRAPHIC PLATE MOVING AT CONSTANT RATE; SAID PROJECTION APPARATUS INCLUDING IN COMBINATION A FIRST SUPPORT MEANS FOR SUPPORTING OPAQUE ORIGINAL COPY TO BE REPRODUCED, A SECOND SUPPORT MEANS FOR SUPPORTING OPAQUE ORIGINALS RECEIVED FROM SAID FIRST SUPPORT MEANS, AN ENCLOSURE HAVING A VARIABLE PRE-SETTABLE WIDTH EXPOSURE SLIT WHICH SPANS AT LEAST A PARTIAL WIDTH OF THE PLATE AND ITS OPENING EXTENDS NORMAL TO THE SURFACE THEREOF, VARIABLE RATE TRANSPORT MEANS FOR MOVING OPAQUE ORIGINALS AT A PREDETERMINED RATE FROM SAID FIRST SUPPORT MEANS TOWARD SAID SECOND SUPPORT MEANS, SAID TRANSPORT MEANS INCLUDING A PLURALITY OF PARALLEL BELTS MOTOR DRIVEN THROUGH A PRESETTABLE VARIABLE SPEED TRANSMISSION; OPTICAL MEANS TO EFFECT PROJECTION OF ORIGINAL IMAGES IN AN OPTICAL PATH FROM A PROJECTION POSITION IN TRANSPORT THROUGH SAID SLIT ONTO THE PLATE SURFACE, SAID OPTICAL MEANS INCLUDING A FIRST MIRROR SUPPORTED IN SPACED RELATION FROM AND HAVING ITS REFLECTING SURFACE INCLINED TOWARD AND SPANNING SAID PROJECTION POSITION, A SECOND MIRROR OPTICALLY ALIGNED WITH SAID FIRST MIRROR AND SUPPORTED IN SPACED RELATION FROM THE PLATE HAVING ITS REFLECTING SURFACE INCLINED TOWARD AND SPANNING AT LEAST A PORTION OF SAID EXPOSURE SLIT, A PRE-SETTABLE VARIABLE FOCUS OBJECTIVE LENS SUPPORTED WITH ITS PRINCIPAL AXIS IN THE OPTICAL PATH BETWEEN SAID FIRST AND SECOND MIRRORS, PRESETTABLE MEANS TO VARY THE LENGTH OF OPTICAL PATH BETWEEN SAID PROJECTION POSITION AND THE SURFACE OF THE XEROGRAPHIC PLATE, MEANS TO ILLUMINATE AN OPAQUE ORIGINAL IMAGE IN SAID PROJECTION POSITION, AND CORRELATING MEANS TO INDEXINGLY GUIDE IN ACCORDANCE WITH A SELECTED MAGNIFICATION RATIO AT WHICH OPAQUE ORIGINALS ARE TO BE REPRODUCED THE APPROPRIATE SETTINGS FOR TRANSPORT RATE, OPTICAL PATH LENGTH, AND FOCUS OF SAID LENS.