Importance

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Abstract

A device (10) and a method for positioning a rotatable printing cylinder (16) for a printing press (12). A drive (24) can rotate the cylinder (16) about a cylinder axis (52) at relatively high and low speeds. A sensor (68) is positioned adjacent to the cylinder (16) for detecting rotational positions of the cylinder (16) and providing a signal which varies in response to detected rotational positions of the cylinder (16). A sensor exciting target (66) has first and second edges (74 and 76) at first and second ends, respectively, of a sector of the cylinder (16). The sensor (68) is aligned with the first edge (74) at a first rotational position of the cylinder (16) and is aligned with the second edge (76) at a second rotational position of the cylinder (16). A controller (56) controls the drive (24) in response to the signal from the sensor (68) to rotate the cylinder (16 ) at the relatively high speed when the sensor (68) is not aligned with a point on the sector and until the cylinder (16) reaches the first rotational position, to rotate the cylinder (16) at the relatively low speed when the sensor (68) is aligned with a point on the sector and until the cylinder (16) is at the second rotational position, and to cease rotation of the cylinder (16) when the cylinder (16) is at the second rotational position.

First Claim