| 摘要 |
A multiway switching device to be installed at a junction of a plurality of web-threading guideways (32a, 32b, 32c, 32d) in a rotary printing press (1) for selectively switching a web (W) from one to another of the guideways, in threading the web along a predefined path through the press preparatory to printing. The switching device comprises a rotary switch (6) rotatably mounted to frame means (29, 30, 31) at a junction of the web-threading guideways which are of substantially radial arrangement about an axis of rotation of the rotary switch, and switch drive means (9 or 9') for causing angular displacement of the rotary switch relative to the frame means. For simpler driving of the rotary switch (6) to required angular positions, there are formed therein at least two intersecting rectilinear switching guideways (47a, 47b) each for intercommunicating one pair (32a and 32b; or 32c and 32d) of the web-threading guideways which are opposed to each other across the rotary switch, and one or more arcuate switching guideways (48a or 48b) each for intercommunicating two (32a and 32d; 32b and 32c; 32b and 32d; or 32a and 32c) of the web-threading guideways which are adjacent each other peripherally of the rotary switch. Afluid-actuatedcylinder, or two such cylinders in tandem, are employed for swiveling the rotary switch (6) between two or three angular positions. <IMAGE> |
