Shaft 6 rotates about fixed axis A and, through bevel gears 7 and 8, rotates shaft 9 about fixed axis B. Shaft 9 carries pinion 2 which slides freely along the shaft on key a. Pinion 2 meshes with gear rack 3 which slides in housing 10. Pin b of rack 3 slides along slot c of link 4 which turns about fixed axis D. Quantity x is set up by turning shaft 6. Quantity y is set up by turning screw 1 about fixed axis E. Screw 1 is connected by a screw pair to housing 10. Angle ϕ of rotation of link 5 is proportional to the linear displacements x and y of rack 3: ϕ=arctan(x/y).
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