The lengths of the links comply with the conditions: D͞E=E͞B=E͞O=l/2 and A͞C=O͞C=C͞B=m/2. The mechanism is based on two lambda-shaped Chebyshev groups, consisting of links 1 and 3, and 2 and 4, connected by turning pairs B and O. If point A is traced along any curve having a polar equation of the form ρ_A=ρ_A(ϕ), (where ρ_A=O͞A and ϕ is the polar angle made by line DOA and the polar axis, then point D describes a curve with an equation ρ_D=ρ_D(ϕ). Quantities ρ_A and ρ_D are related by the condition ρ²_D=ρ²_A±k² , where k²=l²-m²=const.
$770$LW,Ge$