Multicolor perfecting press having an offset blanket with electromagnetic support means

Claim 1

OFFSET PRINTING APPARATUS COMPRISING: FIRST AND SECOND ROLLER MEANS HAVING ROTATIONAL AXES IN PARALLEL SPACED RELATION; A FIRST ENDLESS BELT RECEIVED ON SAID ROLLER MEANS AND MOVED CONTINUOUSLY THEREON, SAID FIRST BELT HAVING AN EXTERIOR SURFACE ADAPTED TO RECEIVE IMAGES THEREON AND THEREBY FORMING AN ENDLESS OFFSET PRINTING BLANKET, AND SAID FIRST BELT HAVING FERROMAGNETIC MEANS THEREIN THROUGHOUT THE LENGTH THEREOF; OFFSET PRINTING PLATE MEANS ENGAGING SAID ENDLESS BLANKET AND TRANSFERRING IMAGES THERETO; SUPPLY MEANS FOR A PRINT BASE MATERIAL; PRINT BASE SUPPORT MEANS COOOPERATING WITH MEANS SUPPORTING SAID FIRST BELT TO SANDWICH THE PRINT BASE MATERIAL BETWEEN SAID PRINT BASE SUPPORT MEANS AND THE OUTER SURFACE OF SAID FIRST BELT AS THE PRINT BASE IS MOVED FROM SAID SUPPLY MEANS, WHEREBY IMAGES OBTAINED FROM SAID PRINTING PLATE MEANS ARE TRANSFERRED FROM SAID FIRST BELT TO SAID PRINT BASE AS SAID FIRST BELT AND PRINT BASE PASS BETWEEN SAID BELT SUPPORTING MEANS AND SAID PRINT BASE SUPPORT MEANS; POSITIVE DRIVE MEANS CONNECTING SAID FIRST ROLLER MEANS TO A DRIVE MOTOR; A FIRST SERIES OF ELECTRO-MAGNETS MOUNTED ON A FRAME EXTENDING ACROSS THE INTERIOR OF SAID FIRST ROLLER MEANS IN A DIRECTION GENERALLY PARALLEL TO THE AXES OF SAID FIRST ROLLER MEANS, SAID MAGNETS HAVING POLES PROXIMATE THE ROLLER ENGAGING FACE OF SAID FIRST ENDLESS BELT, AND SAID FRAME BEING MOUNTED FOR ROTATION ABOUT THE ROTATIONAL AXES OF SAID FIRST ROLLER MEANS AND HAVING MEANS THEREON EXTENDING TO THE EXTERIOR OF SAID FIRST ROLLER MEANS FOR SELECTIVELY POSITIONING SAID FIRST FRAME AND THEREBY SAID MAGNETS OF SAID FIRST SERIES INSIDE SAID FIRST ROLLER MEANS; A SECOND SERIES OF ELECTRO-MAGNETS DISPOSED ON A SECOND FRAME INSIDE SAID FIRST ROLLER MEANS, SAID SECOND FRAME EXTENDING ACROSS SAID FIRST ROLLER MEANS IN A DIRECTION GENERALLY PARALLEL TO THE ROTATIONAL AXES OF SAID FIRST ROLLER MEANS, SAID SECOND FRAME BEING ROTATABLE WITH RESPECT TO THE ROTATIONAL AXES OF SAID FIRST ROLLER MEANS AND SAID SECOND FRAME HAVING MEANS THEREON EXTENDING TO THE EXTERIOR OF SAID FIRST ROLLER MEANS AND ACCMMODATING THE SELECTIVE POSITIONING OF SAID SECOND FRAME ROTATIONALLY IN SAID FIRST ROLLER MEANS; A SOURCE OF ELECTRICAL ENERGY COUPLED THROUGH MANUALLY OPERATED CONTROLLER MEANS AND THROUGH INDICATOR MEANS TO SAID ELECTRO-MAGNETS AND SUPPLYING ELECTRICAL ENERGY THERETO, SAID ELECTRO-MAGNETS THEREBY ESTABLISHING COMPLETE MAGNETIC FLUX PATHS BETWEEN THEIR POLES AND THROUGH SAID FERROMAGNETIC MEANS IN SAID ENDLESS BLANKET, THEREBY FORCING SAID BLANKET INTO TIGHT NON-SLIP CONTACT WITH SAID FIRST ROLLER MEANS, SAID CONTROLLER BEING MANUALLY ADJUSTABLE TO CONTROL THE AMOUNT OF MAGNETIC FORCE PULLING SAID ENDLESS BLANKET AGAINST SAID FIRST ROLLER MEANS SAID BEING ADJUSTABLE TO LOWER THE AMOUNT OF MAGNETIC FORCE; THE EXTENDING MEANS OF SAID FIRST AND SECOND FRAMES ACCOMMODATING THE PROVISIONING OF VARIOUS ANGULAR RELATIONSHIPS OF SAID FLUX PATHS.