| 摘要 |
A power transmission apparatus transmits power from a rotatable cam to an output mechanism. A variable length lever, comprised of first and second lever sections, is pivoted to a lever support by a fulcrum. The lever sections telescopingly or otherwise interconnected to allow the over-all length of the lever to vary. In addition, the first lever section includes a cam following end portion which is drivenly coupled to the cam. Also, the second lever section has an output end portion which is pivoted to the output mechanism. The lever oscillates when the cam following end portion is driven by the cam and drives the output mechanism. A drive adjustment device moves the fulcrum relative to the cam following and output end portions of the first and second lever sections. This varies the throw of the output end portion with the zero drive being possible. The travel of the cam following end portion is restricted to a first line and the travel of the output end portion is restricted to a second line parallel to and spaced from the first line. To increase the compactness of the apparatus, this first line may be parallel to the plane of rotation of the cam with the lever being angled outwardly from such plane of rotation. A biasing mechanism, which may be internal to the lever sections, urges the cam following and output end portions away from one another.
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