Pinion 1 rotates about fixed axis A and meshes with two gear racks, 2 and 3, which slide along fixed guides a-a and b-b. Axes B-B and C-C of the racks form constant angle α. When pinion 1 is rotated, racks 2 and 3 have translatory motion at equal velocities and, consequently, have equal displacements along axes B-B and C-C.
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