| 摘要 |
<p>A document scanning apparatus (2) provides a scan and rescan motion to a scan carriage (30) using only mechanical drive components. Motion of a rotary photoreceptor (6) is transferred, via drive pulley components, to a main drive shaft (72) having, in a first embodiment, (Fig. 2) a pair of pulleys - (90, 90') fixedly mounted at the ends. The pulleys drive cables (92) which, in turn, drive the scan carriage of the disclosed system in a scan or rescan direction, dependent upon the drive pulley rotation. The drive pulley rotation is controlled by a movable hub assembly (70) on a drive shaft, and by a linkage mechanism (100) which is periodically engaged by the scan carriage at a start-or end-of-scan position. Mechanical engagement of the scan carriage with the linkage mechanism causes a reversal of the drive pulley rotation, and hence a reversal of the scan carriage direction of travel. In a second embodiment (Fig. 4), a rack and gear arrangement (112) is used to drive the scan carriage.</p> |
