Tractor driven farm machine

A farm machine having tool means to be rotatably driven by a power takeoff shaft of a tractor, comprising:

• a frame connectable to the tractor;
• rotatably drivable tool means mounted relative to said frame;
• and
• means for transmitting rotational drive from said power takeoff to said tool means, comprising:
• (a) a transmission housing mounted to said frame,
• (b) first and second drive shafts journalled to said housing,
• (c) first and second meshing gears positioned in said housing and respectively mounted on said first and second drive shafts, said first and second gears having different diameters and a different number of teeth,
• (d) an input shaft having one end connectable to the power takeoff shaft of the tractor and another end selectively connectable to portions of one of said first and second drive shafts located outside of said transmission housing,
• (e) a third gear rotatably held in said housing by a driven shaft,
• (f) transmission means for drivingly connecting said driven shaft to said tool means, and
• (g) means for selectively meshing said third gear with one of said first and second gears, wherein said means for selectively meshing comprises eccentric means for journalling said driven shaft to said housing and means for rotating said eccentric means such that said third gear moves between said first and second gears when said eccentric means is rotated,
• whereby said tool means may be driven at a desired rotational speed by connecting said input shaft to a selected one of said drive shafts, and whereby said tool means may be rotatable driven in a desired direction by meshing said third gear with one of said first and second gears.