Noncircular gear segment a is rigidly attached to lever 1 which turns about axis A. Gear segment a meshes with noncircular gear segment 2 which turns about axis C. Links 3 and 4 turn about axes B and D of fixed link 5. When noncircular gear segments a and 2 turn about axes A and C, links 3 and 4 turn about axes B and D, and press workpiece 7 between their jaws. Spring 6 opens the jaws and returns the press to its initial position.
$1768$GL,HP$