| 摘要 |
PCT No. PCT/US97/09915 Sec. 371 Date Jan. 20, 1998 Sec. 102(e) Date Jan. 20, 1998 PCT Filed Jun. 9, 1997 PCT Pub. No. WO98/00655 PCT Pub. Date Jan. 8, 1998In a rotary stage, driven by a conventional multi-tooth rotary worm wheel, interacting with a rotationally powered worm gear, a housing functions as a base mount for the worm wheel. The housing has a bore disposed within a cylinder positioned perpendicular to the worm wheel axis. A rotational power source, such as a motor, is mounted on an elongate support which is mounted along an elongate edge to a base of the housing. The support extends parallel to the motor axis and, along with a biasing spring, biases the motor and worm gear toward the worm wheel. Adjustable screw are provided to vary the pressure load of the bias of the worm gear against the worm wheel, or providing a selectable anti-backlash pressure between the worm wheel and the worm gear.
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