| 摘要 |
A drive mechanism is provided for converting a rotary input to an oscillatory output. The mechanism includes a housing having axially aligned first and second support members. Input and output shafts are journaled within the first and second support members and are substantially axially aligned one with the other. A drive pinion is mounted on the input shaft within the housing and is rotatable thereby. A bevel gear is mounted within the housing and in driving engagement with the pinion. A coupling is provided which has a first end in journaled association with the bevel gear in a position angularly displaced from the rotational axis thereof. The second end of the coupling is pivotally and drivingly connected to the output member at the intersection of the center lines of the bevel gear and the output member. The center line of the coupling defines a cone as the coupling is rotated with the bevel gear and the coupling is operable for oscillating the output member through an angle corresponding to the included angle of the cone.
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