Patent ID: 7225693

Claim:
A slide drive device for a press machine having a slide, comprising: adjusting means for adjusting said slide drive device; said adjusting means to adjust a stroke of said slide and being pivotable about a center position to adjust said stroke; said center position being one of a top and a bottom dead center position of said slide; said adjusting means provided to receive a reciprocating motion; a connecting link coupled to said adjusting means; guiding means for guiding said slide drive device coupled to said connecting link; said connecting link being effective to transfer said reciprocating motion to said guiding means; said guiding means being effective to convert said reciprocating motion to a linearly guided displacement motion; first and second drive branching links separately coupled to said guiding means; first and second toggle means coupled respectively to the first and second drive branching links, and said first and second toggle means coupled separately to the slide; wherein the first and second drive branching links respectively converts the linearly guided displacement motion to a toggling motion of the first and second toggle means, and the first and second toggle means transfer the toggling motion to a linear cyclic motion of the slide.