Abstract: A linear-rotary translator includes a pair of parallel, planar plates spaced apart and held by bolts having eccentric bodies. A drive shaft parallel to the bolts is journalled in the plates and is adapted to engage an operated device related to the plates. A pair of drive forks on the drive shaft straddle a drive rod between the plates and engage rollers extending from a block on the drive piston rod and disposed between the drive forks and reciprocable in rectilinear slots in the plates. The drive rod extends from a piston-cylinder arrangement pivoted to and located in part between the plates. If desired, a spring rod also engages the block, extends through a spacer pivoted between the plates and cooperates with spring discs arranged on the spring rod.