| 摘要 |
A pushbutton tuner including a support plate, tuning means mounted on the support so as to be movable to a position which corresponds to a tuning frequency to be established, and a plurality of presettable pushbutton actuators for selectively adjusting the tuning means to individual positions, each of the pushbutton actuators including a pushbutton which is movable between a front inoperative and a rear operative position relative to the support plate and which is normally urged to its inoperative position, a control plate pivotally mounted on the support plate and having lengthwise elongate slots formed in its opposite ends, the control plate assuming a position relative to the support plate which can be adjusted, a preset plate for releasably locking the control plate on the support plate, a first operating lever having its one end pivotally mounted on the pushbutton and carrying a pin on its other end which is fitted into one of the slots in the control plate, and a second operating lever having its one end pivotally mounted on the pushbutton and carrying a pin on its other end which is fitted in the other slot formed in the control plate, the tuning means including a pair of movable plates extending in a direction perpendicular to the direction of movement of the pushbutton, a link bar having its opposite ends connected to the movable plates so that a movement of one of the movable plate in one direction causes a movement of the other movable plate in the opposite direction, and cam edges formed on the pair of movable plates and having an equal angular orientation, said one movable plate moving in one direction upon abutment of one of the pins against the cam edges of said one movable plate as it moves through the elongate slot formed in the control plate, the movement of said one movable plate being transmitted through the link bar to cause the other movable plate to move in the opposite direction until the other pin abuts against the other cam edge, whereupon a further movement of said other movable plate is interrupted.
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