| 摘要 |
PURPOSE:To achieve rotary operation with a small torque, by providing two movable cams relatively with a given angle, extending one cam surface with another cam to make easy the sliding of the slide plate, in the channel selector applied to radio receivers. CONSTITUTION:The selector has the channel selection axis 10 of rotary-free constitution, tuning element 25 sprung to one direction, and operation lever 41 tentatively moving against the energizing force the element 25 when the axis 10 is turned, and provides the gear 21 of small diameter corresponding to the number of channels selected with a given distance, and memory drum 14 of rotary-free construction having the displacement memory member regulating the amount of shift of the element 25 due to spring force for the selected one when the axis 10 is turned by a given amount and adjustable for the amount of regulation externally. Further, it provides the first cam 13 turned accompanied with the revolution of the shaft 10 for the lever 41, second cam 15 turned after the cam 13 is turned at a given angle, and the rotor 40 of rotary-free construction moving the element 25 driven with the cams 13 and 15 against the spring force. |
