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THREE-BAR SLIDER-CRANK MECHANISM OF A HAND-OPERATED PRESS (TOGGLE-LEVER PRESS)

At point B connecting rod 3 has roller a which slides along slot b whose width equals the diameter of roller a. Workpiece 1 is pressworked by the effort applied to the handle of lever 2 which is the crank of slider-crank linkage ACB.
$1632$SC,HP$