The lenghts of the links comply with the conditions: A͞D=0.8A͞B, A͞B=D͞C, C͞E=E͞B=0.2A͞B, E͞F=B͞G=A͞H and F͞G=E͞B. The mechanism is based on four-bar linkage ABCD. When link 1 turns about fixed axis A, point E of connecting rod 2 describes a path of which a certain portion approximates straight line q-q which is parallel to line AD. For the specified dimensions, figures EBGF and ABGH form parallel-crank linkages and link 4 has translational motion. During the period of time that point E travels along the approximately rectilinear portion of its path, all points of link 4 travel approximately rectilinearly and its axis EF is perpendicular to straight line q-q. Links 3 and 7 turn about fixed axes D and H.
$718$LW,GI$