Method and apparatus for transferring images from xerographic to metallic plates

Claim 1

THE IMPROVEMENT IN THE PROCESS OF TRANSFERRING FUSIBLE POWDER IMAGES FROM A XEROGRAPHIC PLATE TO A CONDUCTIVE LITHOGRAPHIC PLATE COMPRISING THE STEPS OF FORMING ONE OF SAID PLATES IN AN ARC OF SUBSTANTIALLY UNIFORM RADIUS, CONTACTING THE CONVEX SURFACE OF THE CURVED PLATE IN A ROLLING MOTION AGAINST THE SURFACE OF THE OTHER PLATE WITH THE POWDER IMAGE THEREBETWEEN, THEREBY AFFECTING MOVING LINE CONTACT BETWEEN THE IMAGE BEARING SURFACE OF THE XEROGRAPHIC PLATE AND THE CONDUCTIVE LITHOGRAPHIC PLATE AND, SIMULTANEOUSLY WITH SUCH ROLLING MOTION, APPLYING AN ELECTRICAL POTENTIAL BETWEEN THE XEROGRAPHIC PLATE AND THE CONDUCTIVE LITHOGRAPHIC PLATE, AND FIXING THE IMAGE TRANSFERRED ONTO THE CONDUCTIVE LITHOGRAPHIC PLATE.