| 摘要 |
An apparatus for positioning the tip of a stylus adjacent a rotating scaife while continuously rotating the stylus comprises a base plate connected to a platform by means for sweeping the plate through a sweep arc. A tube is connected to the base plate by means for pivoting the tube about an axis parallel to the surface of the scaife, and is also connected to means for exerting a constant torque about the axis in a direction forcing one end of the tube toward the surface of the scaife. The tube supports a rotating shaft and is positioned to allow one end of the shaft to move adjacent the surface of the scaife, the one end of the shaft being adapted to hold the shank of a stylus. A ramp block is mounted on the platform between the base plate and the scaife. The block has an inclined ramp oriented along a direction which allows the tube to make contact therewith, while the stylus is positioned adjacent the surface of the scaife, and be lifted from the surface of the scaife when the sweeping means moves the plate through a portion of the sweep arc.
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