Abstract: A device that is useable to clamp a rotatable shaft or spindle and which is provided with cams or pressure pieces, to retain or to tension packings on a cylinder, is provided. The shaft or spindle can be both rotated about an axis of rotation, as well as clamped against rotation by the device. The device can be pivoted with respect to the shaft or spindle about a pivot axis which is essentially perpendicular to the axis of rotation of the shaft or spindle. The pivotable device can be provided as a pawl or lever that interacts with a pair of stops to hold it in a shaft or spindle locking position.

Abstract: Rotatable shafts that are configured as profiled shafts or as spindles provided with cams or pressure pieces are used to actuate devices for retaining and/or tensioning in cylinders, especially in cylinders or printing machines. Such shafts require in addition to a device for actuating the clamping and/or tensioning device also a locking device for securing them against unintentionally twisting or releasing them and for the defined adjustment of their position. The aim of the invention is therefor to provide a single means for clamping or tensioning as well as locking the shaft. To this end, the device can be swiveled in the peripheral direction of the shaft for tensioning/clamping it, and about an axis that is substantially perpendicular to the swivel axis of the shaft for locking the shaft. For adjusting and fixing a defined position of the shaft (04) and for locking it with respect to its direction of swiveling a pawl (21) interacts with a pair of stops (24,26) in the locking position (A).