| 摘要 |
<p>A standard printing cylinder is supported by a mandrel assembly in a printing machine having bearings, the cylinder having end heads at either end provided with circular bores and being demountable on the mandrel assembly. The assembly comprises a tube receivable within the cylinder and journals joined to opposing ends of the tube and extending axially therefrom for insertion in the machine bearings. Each journal has an expansible metal sleeve pinned thereon whose normal diameter is such that the sleeve fits into a respective end head bore of the cylinder. The sleeve surrounds an annular hydraulic chamber formed on the journal, which chamber communicates with an axially-extending main internal duct filled with hydraulic fluid and having an inlet section in line therewith whose mouth opens into the free end of the journal. The journal has a leading section which is shrunk fit onto an end of the tube and an intermediate section which is surrounded by the sleeve to define the annular hydraulic chamber. The intermediate section has grooves on either side of the chamber in which "o" rings are received to effect a seal preventing leakage of fluid when the sleeve is expanded. A piston is slidable in the inlet section and has a piston screw which is accessible through the mouth. The screw when turned in advances the piston to produce hydraulic pressure which is transmitted through the chamber to the sleeve to cause expansion thereof whereby the sleeve grips the end head to lock the cylinder to the mandrel.</p> |
