Variable drive transmission

A variable drive transmission comprising a main input shaft, a principal element comprising a plurality of planetary gears within an output element engageable by a drive gear on said input shaft, an adjustable camming and drive assembly interconnected to said principal element by a transfer gear, said adjustable camming and drive assembly comprising a pair of oppositely disposed offset circular cams on a cam disk, pins extending from said circular cams registerable in slotted control disks on said main input shaft, a modified form of said principal element interconnected to said adjustable camming drive comprising at least one secondary drive input gear on said main input shaft, a plurality of planetary gears engageable on said secondary drive gear and engageable on a ring gear, a secondary output gear selectively driven by said planetary gears and a multiple transfer gear, a pair of cam engagement arms with one-way clutch drive gears selectively engaged thereon interconnecting said adjustable camming device and said modified form of said principal element, a central transfer gear engageable with a ring gear on said principal element for selectively disengaging said adjustable cam and drive assembly from said main drive shaft.