Slide driving device for use in metal working press

In a slide driving device for use in a metal working press including a main shaft rotatably suspended on the device frame, a rotary member fixedly mounted on the main shaft and adapted to be rotated at a constant angular velocity by a driving power source, an eccentric sheave mounted on the main shaft and adapted to be eccentrically rotated about the main shaft, an oscillating link member oscillatingly mounted on the eccentric sheave to eccentrically rotate the eccentric sheave, the oscillating link member being adapted to oscillate in response to the eccentric rotation of the eccentric sheave, a connecting rod pivotally connected between the oscillating link member and the slide, and an eccentric arm shaft connected between the eccentric sheave and the rotary member at their respective offset positions so that rotation of the rotary member is transmitted to the eccentric sheave, the improvement comprising:

• a fixed gear serving as a bushing fixedly secured to the device frame at one end of said main shaft;
• a planetary or epicyclic gear fixedly secured to one end of said eccentric arm shaft and adapted to mesh with said fixed gear;
• a pin shaft eccentrically and rigidly secured through an arm member to the other end of said eccentric arm shaft wherein said eccentric arm shaft, arm member and pin shaft form an integral crank shaft;
• a slider rotatably mounted on said pin shaft;
• and
• a long slot formed at a disk part of said rotary member in the radial direction thereof within which said slider is slidably housed, wherein when said rotary member is rotated said eccentric arm shaft is rotated about said main shaft while rotating on its own axis by the co-operative action of said fixed and planetary gears, whereby said slider is slidingly moved within said long slot of said rotary member in the radial direction thereof, and said eccentric sheave is eccentrically rotated about said main shaft at different angular velocities.