Gears 1 and 2 mesh with each other and rotate about fixed axes B and A. Cranks b and a are rigidly attached to gears 1 and 2 and are connected by turning pairs D and C to connecting rods 3 and 4 which, in turn, are connected by turning pairs F and E to T-shaped slider 5. Slider 5 moves in fixed guide d whose axis is perpendicular to axis x-x. The dimensions of the links comply with the conditions: r₁=r₂=r, where r₁ and r₂ are the pitch radii of gears 1 and 2, A͞C=B͞D, and C͞E=D͞F. The angles of inclination of lines AC and BD to axis x-x are always equal and symmetrical. When gear 1 rotates, slider 5 reciprocates with the motion of the slider of an aligned slider-crank mechanism. If in the-given version the masses of gears 1 and 2 and of connecting rods 3 and 4 are the same there is no pressure exerted by the inertia forces on guide d.
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