Abstract: A stencil screen printing machine includes a screen retention frame horizontally reciprocable forwardly and rearwardly in one dimension for retaining and reciprocating a print stencil screen in a plane during a forward print stroke and a rearward return stroke. The stencil screen printing machine includes a rotational print cylinder beneath the frame that has a rotational axis transverse to the one dimension and that has a cylindrical peripheral surface for supporting print stock to be printed. Vertically movable lifting and lowering supports are operably associated with the print cylinder and are shiftable to place the cylinder peripheral surface and the print stock thereon upwardly at the stencil screen plane. A stencil squeegee is operably located above the plane and has a lower edge. Vertically movable lowering and lifting supports are operably associated with the squeegee and are shiftable downwardly to place the squeegee lower edge at the plane.

Abstract: A printing press electronic side guide registry apparatus for sheet stock to be printed on a printing press having a print cylinder, print stock forward motion advancer through the print cylinder, and a forward motion registry stop including a laterally movable side registry stock gripper device comprising a slide anvil positioned to be adjacent one surface of the stock, and a fluid cylinder positioned to be adjacent the opposite surface of the stock, aligned with the slide anvil to grip sheet stock therebetween, the slide anvil and fluid cylinder both mounted on a laterally shiftable support movable transverse to sheet stock forward motion, a nut connected to the support, and a laterally extending screw operably engaging the nut, a rotational servo motor drivingly connected with the screw for rotation of the screw to laterally drive the nut, support, fluid cylinder and slide anvil, and a sheet edge detector electrically associated with the servo motor to controllably actuate and deactuate the servo motor, wh

Abstract: A stencil screen printing apparatus for printing rigid sheets comprising an intermittently rotatable cylinder, a reciprocable stencil screen frame, a power drive for the cylinder and stencil screen frame to move them in synchronism with each other, a vertically reciprocable squeegee above the cylinder, infeed belts for feeding rigid sheets along a path toward the cylinder, a variable speed drive for the infeed belts, and controls to slow the drive for an increment of the belt advancement and then stop the drive, sheet pushers and a variable speed servo screw drive operably connected to the sheet pushers, the sheet pushers being forwardly shiftable toward the cylinder to push the rigid sheet front edge beneath the squeegee and the stencil screen frame, and side registry alignment pusher tabs and a variable speed servo screw drive for laterally aligning the rigid sheet relative to the cylinder, whereby the sheet pushers and the side registry tabs simultaneously align the sheet at 90.degree.

Abstract: A printing press feeder capable of sheet feeding from the rear, sheet feeding from the front, or stream feeding from the rear, using tracks above a stock support for the feeder, the sheet feeder head being movably mounted on these tracks, and a movable drive connection from a power source to the sheet feeder head for driving of the sheet pickup advancers in the different head positions. The sheet feeder has first and second alternate drive mechanisms, on opposite ends of the transverse drive shaft, the first drive mechanism having a variable speed drive for sheet feeding individual sheets and slowing feed of each sheet as the sheet approaches the print cylinder, and the second drive mechanism having a constant speed drive for stream feeding overlapping sheets to the print cylinder. The press has nonprint lift cylinders engaging the squeegee mount and actuable to lift the squeegee out of print position, but still within the stencil screen frame, to allow the stencil screen frame to cycle without printing.

Abstract: A printing press feeder capable of sheet feeding from the rear, sheet feeding from the front, or stream feeding from the rear, using tracks above a stock support for the feeder, the sheet feeder head being movably mounted on these tracks, and a movable drive connection from a power source to the sheet feeder head for driving of the sheet pickup advancers in the different head positions. The sheet feeder has first and second alternate drive mechanisms, on opposite ends of the transverse drive shaft, the first drive mechanism having a variable speed drive for sheet feeding individual sheets and slowing feed of each sheet as the sheet approaches the print cylinder, and the second drive mechanism having a constant speed drive for stream feeding overlapping sheets to the print cylinder. The press has nonprint lift cylinders engaging the squeegee mount and actuable to lift the squeegee out of print position, but still within the stencil screen frame, to allow the stencil screen frame to cycle without printing.

Abstract: This invention relates to a method for forming a colored image on a degradable sheet material. As a result, a negative- or positive-working color proofing sheet can be produced on a variety of printing paper stocks. Upon exposure to an actinic radiation source through a screened image and development, it can accurately reproduce the image on the degradable sheet. The construction is useful as a color proof which can be employed to accurately predict the image quality from a lithographic printing process on a variety of printing surfaces.