PURPOSE: To have restriction of operating range of a rotary part, which can rotate over 360°, by furnishing a sector-shaped driven gear which is driven at a gear ratio 1:2 to the driving gear mounted on a shaft, and installing a rotation display and a restricting member in contact with this sector-shaped end part.
CONSTITUTION: A driven gear 20 decelerates the revolving angle of a driving gear 10 at a certain ratio and rotates within a range specified by restricting members 31, 32. A rotation display part 22 indicates roughly the revolving angle of the driven gear 20 to facilitate identification of the number of revolutions of the driving gear 10. Therefore, restriction of the operating angle of the rotary part is determined from the ratio of cogs of the driving 10 to driven 20 gear and the center angle of sector-shaped gear, which enables optimum design to suit the service conditions.
HIRAKAWA KENJI
NIKAIDO MITSUHIRO
Next Patent: JPS6357956