| 摘要 |
A self-balancing imaging drum (300) for supporting print media (32) comprises an external surface (303) having a plurality of vacuum holes (306) extending from the hollowed-out interior portion (304) of the self-balancing imaging drum (300). A first vacuum supply (450) is formed in the hollowed-out interior portion (304) thereby communicating vacuum through the plurality of vacuum holes (306) for holding print media (32) onto the external surface (303) of the self-balancing imaging drum (300). At least one balance corrector (490) consists of a vacuum cylinder (480) for housing a vacuum piston (470) with a return spring (460) mounted in the wall of the self-balancing imaging drum (300) such that when the self-balancing imaging drum (300) is rotated it generates a second vacuum supply (440) to the external surface (303) of the self-balancing imaging drum (300) for holding the print media (32). If no print media (32) is present the vacuum piston (470) moves outwardly to correct the balance of the self-balancing imaging drum (300). The self-balancing imaging drum (300) has a large number of balance correctors (490) disposed in the wall of the self-balancing imaging drum (300).
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