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You must understand that the shape of gears does not affect the ratio. Ratio is controlled by number of teeth , ie if the driven gear has 10 and the driver has 5 , then you would have a 2:1 ratio and vise versa.
In the case of cone shaped gears of the same shape and number of teeth , the ratio changes with the contact gear or sifter gear .
That is why in the illustration the center shaft called the shifting shaft which is spring resisted , when pressed will move the shifting gear to different positions by such changing the ratio of input to output shafts.
It is like a belt driven pulley system on a centrifugal clutch system , just that it is positive contact and drive .