Pinion 1 rotates about fixed axis A and meshes with composite rack a of slider 2 which moves in guides b-b of slider 4. Slider 4 moves in fixed guides c-c. Slider 2 carries pin k which slides in slot d of slider 3. Slider 3 moves in fixed guide e. Composite rack a is made up of two straight and two semicircular portions. When driving pinion 1 rotates continuously at uniform velocity, slider 2 and slider 3 have uniform translational motion while pinion 1 meshes with the straight portions of rack a. During these periods, slider 4 has long dwells. When pinion 1 meshes with the semicircular portions of rack a, slider 3 has nonuniform motion and slider 4 has translational motion in guides c-c.
$2510$LrG,D$