Abstract:
A rotary ink valve assembly with a plurality of rotary ink valves contained in a housing (10), having a stationary outer portion (16) with first and seconds ends (50, 52) connected by a cylindrical body (54) having at least one bypass aperture (42) adjacent the first end (50) and at least one ink output aperture (40) adjacent the second end (52). A substantially tubular inner portion (18) rotates within the cylindrical interior area (56) of the outer portion (16) with at least one bypass aperture (66) in the side wall (64) adjacent a first closed end (60) and at least one ink output aperture (68) in the side wall (64) adjacent a second open end (62). Ink is supplied to at least the open second end (62) for supplying ink to the inner portion (18) while the inner portion (18) is rotated by means (28, 32, 34) between an open position, a closed position and an intermediate position. In the open position only the ink outupt aperture (68) in the inner portion (18) aligns with the ink output apertures (40) in the outer portion (16). In the closed position only the bypass aperture (66) in the inner portion aligns with the bypass aperture (42) in the outer portion (16). In the intermediate position none of the apertures (40 adn 68 or 42 and 66) are in alignment.