The lengths of the links comply with the conditions: A͞B=P͞C, B͞C=A͞P and D͞B:B͞Q=D͞A:A͞P= P͞C:C͞Q. Figure ABCP is a parallel-crank linkage and points D, P and Q lie on a single straight line. Line QF of link 6 should be parallel to line PE. Links 4 and 5 turn about fixed axis P and are connected by turning pairs A and C to links 2 and 3. Link 1 turns about fixed axis E and is connected by turning pairs D and F to links 2 and 6. Link 3 is connected by turning pairs B and Q to links 2 and 6. When link 5 turns about fixed axis P, link 6 has translational motion and all of its points describe circles of radius E͞F.
$727$LW,GI$