| 摘要 |
An image processing apparatus (10) comprises an imaging drum (300) for holding print media (32) and donor material (36) in registration on the imaging drum (300). A print head (500), driven by a lead screw (250) and stepper motor, moves along a line parallel to a longitudinal axis (X) of the imaging drum (300) as the imaging drum (300) rotates. The print head (500) is brought repeatably to a mechanical registration position using sensors. For coarse positioning, the print head (500) is moved to a first linear sensor position, with the drive motor operated in full-step mode. For fine positioning, the drive motor is then operated in microstepping mode, during which a second sensor detects rotational orientation by detecting a rotational indicator mounted on the lead screw (250). The rotational indicator permits straightforward adjustment for fine-tuning, being adjustable to any one of a number of fixed positions relative to lead screw rotation. <IMAGE> |
