Additionally, so-called drum controller transmissions are known, where the end output mechanisms of the gear ratio steps are actuated through a rotating drum controller. In the drum controller, e.g. shifting gate-like grooves are incorporated, which extend on the surface of the cylindrical drum controller both in circumferential direction and in axial direction so that upon rotation of the drum controller around its longitudinal axis shifting forks, which are connected with the drum controller kinematically through elements traveling in the grooves, move in the axial direction of the drum controller; the shifting sequence of the gear ratio steps in relation to the rotation of the control shaft is set by the course of the grooves. With an appropriate design of the grooves, such drum controller transmissions allow the disengagement of an old and the engagement of a new gear ratio step to overlap, which offers a certain time advantage during the shifting process and thus reduces the duration of the tractive force interruption, however only sequential shifting is possible, e.g. shifting from gear I into gear III is just as impossible as a direct shifting back from e.g. gear V into gear I.

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Note added at 1 day7 hrs (2006-05-13 19:28:11 GMT)
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