The mechanism is based on four-bar linkage ACDG. Point B of connecting rod 5 of the linkage describes connecting-rod curve q-q. Links 1 and 6 are connected by sliding pairs to sliders 7 and 4, which are connected together by turning pair H. Link 2 is connected by turning pair B to connecting rod 5 and by a sliding pair to slider 3 which, in turn, is connected by turning pair H to sliders 4 and 7. When link I turns about fixed axis A, any point of link 2, lying on axis EBH, describes an equidistant curve of connecting-rod curve q-q. The equidistant curves p-p and t-t are described by points E and F of link 2.
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