| 摘要 |
<p>A two-speed stepper actuator unit (10) for use in paper machine headbox (9) slice lip (80) control has a spindle (16) driven by a power nut (24). A lever clamp (32) has legs (34 and 36) selectively clamped together around nut (24) by means of a cam action locking plate (40) driven by solenoid (48). The longer leg (36) of clamp (32) has a cam follower which rotationally drives nut (24) through the lever (36) in response to the shape of a cam plate (50) which translates in the housing (12) on antifriction rollers (66) when drive solenoid (54) is actuated. The cam surface (60) guides the lever (36) in either of two speed modes depending on whether spring biased roller follower (52) is on cam surface portion (62 or 64).</p> |
