SPRING BIASING LOCKING MECHANISM FOR STEP AND REPEAT MOTORS

摘要

A spring biasing locking mechanism (50) is provided for a step and repeat motor (30). The motor (30) includes a base (32) having a channel (34), an output member (36) in the channel, at least one translator drive element (40) and first and second clamping elements (46 and 48). The spring biasing locking mechanism (50) includes a locking structure (52) joined to the base by a hinge (54). The locking structure (52) spans both clamping elements (46 and 48). A spring (56) biases the locking structure (52) toward the channel (34) so that the spring force is transmitted to the two clamping elements (46 and 48). The spring biased locking mechanism (50) accommodates wear of the device, accommodates thermal expansion of the motor components, provides a limit on clamping force and provides a zero power hold condition.