| 摘要 |
The mechanism is designed to vary the speed and couple transmitted from a motor to motor driven part and comprises a lever (4) hinged on an axis (3) fixed to an input shaft (1). The input shaft (1) is linked to a motor drive; - two supports (5,7) situated at the ends of the lever (4); - an output shaft (9) linked to the device to be driven. The lever (4) is L-shaped and is hinged at the corner of the L. The support (5) circulates in the path of a cam (6) which pivots the lever (4) and consequently the support (7) around the axis (3) during rotation of the shaft (1). The path of the cam (6) is a rectangular slot whose trajectory is a closed curve which follows the axis of rotation of the input shaft (1) and whose sections have a helicoidal shape.
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