Abstract: An apparatus for verifying the integrity of a printing system is provided. The apparatus includes an interpreter for converting an input image data file written in a first page description language into an output image data file written in a second page description language, and a comparator for comparing the output image data file with a reference output image data file.

Abstract: A technique for downloading or activating or deactivating selected machine features from a remote central station that is connected to the remote machine by a communication channel. Also, the invention includes identifying features to be downloaded and then activated at a given site and communicating the data relative to the identified features to the remote machine.

Abstract: A hydraulic fluid pressure energy translating device of the sliding vane type comprising a cartridge including a cam ring including an internal contour, a rotor having a plurality vanes rotatable therewith and slidable relative thereto in slots in the rotor with one end of each vane engaging the internal contour. The cartridge includes a rotor and has an internal contour cooperating to define one or more pumping chambers between the periphery of the rotor and the cam contour through which the vanes pass carrying fluid from an inlet port to an outlet port. Two pressure chambers are formed for each vane and each vane has two surfaces one in each chamber, both being effective under pressure in the respective chambers to urge the vanes into engagement with the cam. The cartridge further includes support plates.

Abstract: A fluid pressure energy translating device of the sliding vane type comprising a cam ring including an internal contour, a rotor having a plurality of vanes rotatable therewith and slidable relative thereto in slots in the rotor with one end of each vane engaging the internal contour. The rotor and internal contour cooperate to define one or more pumping chambers between the periphery of the rotor and the cam contour through which the vanes pass carrying fluid from an inlet port to an outlet port. At least one cheek plate is associated with the body and rotor. Two pressure chambers are formed for each vane and each vane has two surfaces, one in each chamber, both being effective under pressure in the respective chambers to urge the vanes into engagement with the cam. A generally annular internal feed passage is formed entirely within the rotor and communicates with one set of the pressure chambers.