| 摘要 |
A printing roller for a rotary press consists of a tubular, elastic, thin shell which is rigidly and tightly joined to the ends of the roller, the roller having peripheral chambers which contain a non-compressible fluid, and with means for displacing the fluid in order thus to increase the external diameter of the printing roller. The devices for displacing the fluid consist of a threaded spindle which can be screwed into a line which is operatively connected to chambers taking up the fluid. The threaded spindle is operatively connected to a coaxially arranged piston which can transmit a pressure force to the fluid in the chambers. The outer edges of the enveloping shell have two lateral enlargements to create a receptacle or a seat for the printing plate which is to be mounted thereon. The receptacle has a depth which corresponds to the thickness of the printing plate. In an advantageous manner, the outer edges of the edge enlargements are rounded. The enlargements can be produced by machining the shell, for example by removing material or by applying material; in the latter case, in an advantageous manner, by application of a material of the same type, having properties which are similar to those of the printing plate. For taking up printing plates which consist of plates wound up and fitted together at the ends, the shell has at least one longitudinal slot in which the butt joint of the printing plate is located and fixed.
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