Abstract: In an apparatus having an expandable mandrel die cylinder for electro-plating thereon a thin-walled, hollow, metal cylinder with a closed or perforated wall, the hollow die cylinder is loosely fitted at its ends over support flanges. The clearance space between the cylinder and the flanges is sealed by a soft gasket and electrically bridged. During the plating, the die cylinder is radially expanded practically uniformly along its length by a pressurizing of the hollow space inside it. After completion of the plating, the pressure is released to contract the die cylinder and the metal cylinder which has been plated on the die cylinder is separated from it.

Abstract: A squeege structure for a screen stencil of a printing machine comprises an elongated carrier frame and a squeegee coupled to the carrier frame by a thrust drive for moving the squeegee between operative and nonoperative positions. The thrust drive includes a central first thrust drive unit and a plurality of second thrust drive units mounted on each side of the first thrust drive unit. The movable portion of the first thrust drive unit may only move along its thrust axis which is in a direction perpendicular to the longitudinal axis of the carrier frame and is restrained from moving in a direction perpendicular to the thrust axis. The movable members of the second thrust drive units may move along their thrust axes and may also move in a direction perpendicular to the thrust axis and parallel to the longitudinal axis of the carrier frame, but may not move in a direction perpendicular to both the thrust axis and the carrier frame longitudinal axis.

Abstract: A rotary screen process printing press has a plurality of printing stations, each having a pair of first and second transverse bars and a cylindrical stencil which is movably and adjustably supported between each pair of bars. The drive shafts for rotating the stencils are mounted in the first bars. The ends of each stencil are provided with bearing plates or head bearings. One end of each bearing plate is coupled to a first bar so as to pivot about the longitudinal axis of its drive shaft. The other end of each bearing plate has a mechanism to lift or lower the bearing plate to cause it to pivot about its shaft axis so that a stencil may be moved relative to the material being printed without moving its drive shaft. The lifting mechanisms and the pivotable coupling are adjustably attached to the bars to permit the position of the stencil to be varied.

Abstract: To place a driven shaft in accurate angular alignment with respect to a continuously rotating driving shaft or, selectively, with respect to a fixed reference, the fixed reference is formed as a housing, the driving shaft has a disk with a cam track attached thereto, and the housing likewise has a disk with a cam track. The driven shaft has an engagement pin connected thereto, axially slidable and engageable, respectively, with the cam tracks of the driving shaft, or of the housing,.

Abstract: The ends of rotary stencils are attached to an attachment ring which is coupled to a drive element on the printing press by means of a universal joint, in the form of a gimbal, so that mis-alignment of the attachment ring with respect to the drive axis of the printing press will not cause distortion of the stencil, during rotation, thus stressing the stencil and causing inaccuracies in reproduction of the pattern to be printed from the stencil. The operating elements of the universal joint, or gimbal construction is preferably protected fron ink, and contamination by means of O-rings, or the like; the connection between the universal joint and the stencil end ring is a bayonet-type cam-recess quick-release connection.