| 摘要 |
In a work station forming part of a clinical analyzer, camming apparatus is provided which allows relative rotational motion between a cam and a cam follower connected to the work station, for example, a liquid dispenser. The cam follower is movable on a carrier which frictionally engages the cam, unless the carrier is restricted. The cam is rotated by a drive gear. However, it is difficult to hold the cam stationary with respect to a carrier for maintenance. Described herein is an improved locking mechanism (200, 202, 210, 212, 220, 220', 240, 240', 242, 242') which locks the carrier (22) against inadvertent rotation. The locking mechanism comprises a gear segment (200, 202) mounted on the carrier (22) and positioned to engage the drive gear (68) during a portion of the engagement by the drive gear (68) of the gear segment carried on the cam itself. <IMAGE> |
