Gear 1 rotates about fixed axis D and meshes with gear 5 which rotates about fixed axis A. Gear 5 is connected by turning pair E to slider 3 which moves in slot a of slotted link 2. Link 2 rotates about fixed axis B and is connected by turning pair C to connecting rod 6 which, in turn, is connected by turning pair F to slider 4. Slider 4 moves along fixed guides d-d. When driving gear 1 rotates at uniform velocity, slotted member 2 rotates at nonuniform velocity and slider 4 reciprocates with unequal average velocities of its forward and return strokes. The stroke of slider 4 can be varied by adjusting the axis of turning pair C along slot b of link 2 and clamping it in the required position.
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