| 摘要 |
A pair of orthogonally oriented linear member are slidingly linked to a base at their respective ends. A stage, having a pair of orthogonally oriented bores, receives the pair of linear members, thereby permitting the stage to move in any horizontal direction. The stage further has two parallel, vertically oriented bores to receive a pair of parallel, vertically oriented linear members. The adjacent ends of the vertically oriented linear members are connected by upper and lower platforms, each having a cable guide thereat. A motor is mounted to the base and is coupled to a drive shaft. A hangar, fixedly mounted to one of the horizontal linear members, rotationally hold a first drive pulley which is slidably mounted on the drive shaft. Located opposite the drive pulley and also fixedly mounted to the horizontal linear member is a cable hangar. A cable frictionally engages the drive pulley to translate rotational movement of the drive pulley into vertical movement of the platforms. This is accomplished by placing first, second, third, and fourth lateral cable guides at the stage with the first and fourth being proximate to one another and the second and third being proximate of one another. The cable extends from the hangar, in order, to the first lateral guide, the upper platform guide, the second lateral guide, the drive pulley, the third lateral guide, the lower platform guide, and the fourth lateral guide where after it again terminates at the fixed hangar. Each horizontal linear member may also be linked to a motor to supply motive forces to the stage for horizontal movement.
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