| 摘要 |
<p>Reversing rotary drive transmission means for converting continuous rotation in one direction into rotation alternately in mutually opposite directions comprises a drive bevel gear (35) rotatable by a drive shaft and two driven bevel gears (51, 53) mounted on a driven shaft (49), the drive gear (35) having teeth on only a sector thereof so as to alternately drivingly engage the two driven gears (51, 53) as the drive shaft rotates. The gear teeth on the driven gears (51, 53) have the same tooth pitch and are offset relative to each other by an arc length measured along the pitch circle which is not greater than one quarter of the tooth pitch.</p> |
