| 摘要 |
A shaft for gripping the inside diameter of the cores for winding webs such as of paper, plastic films, metal foils, fabric, and the like, which shaft has integrally therein a longitudinal fluid pressure manifold duct connecting spaced radially projectable core gripping rams or pistons. The fluid may be a gas such as air for smaller shafts, but preferably the fluid is a dimensional stable hydraulic liquid which may contain colloidally suspended metallic solids. Preferably the gripping rams or pistons are controlled from an hydraulic master cylinder mounted near one end of the shaft to form an integral unit. Preferably also the master cylinder and rams are statically sealed by rolling type diaphragm means. The piston in the master cylinder may be operated by a circumferential sleeve threaded to said cylinder and locked in position by a lock ring or nut. The radially expandable rams may contact directly the inside diameter of the cores they are to hold, or may operate through cylindrical segments, shells or leaves with friction engaging outer circumferential surfaces that grip the inside of the cores. These leaves may be provided with radially movable guide pistons mounted in the outer circumference of the shaft. Either or both of the radially extendable guide pistons and rams are normally urged in their retracted positions by spring means associated therewith. A pressure regulator or accumulator may be provided in the opposite end of the shaft connected to the manifold duct for limiting the pressure which can be applied to the rams.
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