The lengths of the links comply with the conditions: A͞B=C͞B=B͞M=1, E͞A=0.54, C͞E=1.3, β=80°, M͞D=1.603, F͞D=0.695, C͞F=1.8 and E͞F=2.78. Point M of connecting rod 2 in four-bar linkage EABC describes connecting-rod curve a-a which is self-intersecting at point C. The portion of this curve shown by a heavy continuous line approximates a circular arc of radius D͞M with its centre at point D. When point M is on this portion of path a-a, link 4 is almost stationary, i.e. it practically has a dwell at a certain intermediate position. The return stroke of link 4 has no dwell.
$758$LW,D$