Patent ID: 6990898

Claim:
A mechanical pressing machine, comprising an input shaft rotatably mounted to a housing, a cam mounted concentrically on said input shaft and having a cam surface with a plurality of projections, said cam surface being symmetric with respect to said input shaft and the number of said projections being equal to 2n when n is a natural number, a slider supported by the housing for reciprocal sliding movement in a direction transverse to said input shaft, a first cam follower rotatably carried on said slider to abut against said cam, slider-preloading means for biasing said slider toward said cam to maintain an abutment of said first cam follower against said cam, and a dynamic balancer, said dynamic balancer including a sliding block carried in said housing for reciprocal sliding movement in a direction transverse to said input shaft, said sliding block being arranged at a location opposite from said slider with respect to said cam, a second cam follower rotatably carried on said sliding block to abut against the cam at a location opposite from said first cam follower with respect to said cam, a balance weight connected to said sliding block for movement in unison with said sliding block, and sliding block-preloading means for biasing said sliding block toward said cam to maintain an abutment of said second cam follower against said cam.