Charging and/or printing unit for electrophotographic processes

Claim 1

AN IMPROVED CHARGING AND PRINTING UNIT FOR ELECTROPHOTOGRAPHIC PROCESSES COMPRISING A MAIN FRAME, A BACKING PLATE OF ELECTRICALLY CONDUCTIVE MATERIAL CARRIED BY THE SAID FRAME, MEANS ON SAID FRAME TO HOLD A PHOTOCONDUCTOR SHEET AND NEGATIVE ON SAID BACKING PLATE, A PAIR OF TRACKS ON SAID FRAME EXTENDING ALONG TWO OPPOSITE SIDES OF SAID BACKING PLATE, A CARRIER MOVABLE ON SAID TRACKS, MEANS TO MOVE SAID CARRIER ACROSS SAID BACKING PLATE FROM END TO END, CHARGING MEANS ON SAID CARRIER EXTENDING ACROSS SAID PLATE BUT INSULATED FROM SAID CARRIER, MEANS TO APPLY ELECTRICAL POTENTIAL BETWEEN SAID CHARGING MEANS AND THE SAID PLATE, A HOUSING AND LIGHT SOURCE ON SAID CARRIER ALSO SPACED FROM SAID PLATE AND EXTENDING ACROSS SAID PLATE, A SLOT IN SAID HOUSING FACING SAID PLATE, AND A PAIR OF RESILIENT PRESSURE ROLLERS MOUNTED ON SAID CARRIER TO CONTACT SAID PLATE ON EACH SIDE OF SAID LIGHT SOURCE AND PRESS SAID NEGATIVE AND PHOTOCONDUCTOR SHEET ON TO SAID PLATE.