Method and apparatus for reproducing a subject to be transferred to a rubber blanket for letterpress and offset printing and the like

Claim 1

A GRAPHIC ARTS ASSEMBLY FOR CORRECTING THE DISTORTION OF PRINTING PLATES CAUSED BY CURVING OF THE PLATE ABOUT A PRINTING CYLINDER COMPRISING A FRAME, A CAMERA AT ONE END OF SAID FRAME HAVING A LENS TILTABLE ABOUT AN AXIS EXTENDING TRANSVERSELY OF SAID INTERSECTING ITS OPTICAL CENTER, MEANS IN THE CAMERA ENGAGEABLE WITH THE FILM FOR ACCURATELY LOCATING THE FILM IN THE FOCAL PLANE OF THE LENS OF THE CAMERA, A COPYBOARD ON SAID FRAME IN SPACED RELATION WITH RESPECT TO SAID LENS AND HAVING MEANS ON ONE SIDE THEREOF FOR HOLDING THE SUBJECT TO BE PHOTOGRAPHED AND MEANS ON THE OPPOSITE SIDE THEREOF ENGAGING A NEGATIVE FOR ACCURATELY LOCATING AND HOLDING THE NEGATIVE OF THE SUBJECT PHOTOGRAPHED IN THE SAME RELATION AS THE SUBJECT, MEANS FOR TILTING SAID COPYBOARD AT AN ANGLE SUFFICIENT TO COMPENSATE FOR THE DISTORTION CAUSED BY CURVING OF THE PLATE ABOUT ITS PRINTING CYLINDER, MEANS FOR TILTING SAID LENS AT THE ANGLE OF TILT OF SAID COPYBOARD, SAID COPYBOARD BEING ROTATABLE ABOUT AN ANGLE OF 180* TO POSITION SAID MEANS AT THE BACK OF SAID COPYBOARD TO FACE THE LENS OF THE CAMERA AND BEING OPEN IN THE CENTER THEREOF TO ACCOMMODATE THE PROJECTION OF LIGHT THROUGH A NEGATIVE ON SAID LOCATING MEANS.