This mechanism is based on the four-bar slotted-link ellipse envelopment mechanism ABC. Added to this linkage is a double guiding element consisting of two sliders, 4 and 5, connected together by turning pair P. Point P traces the space centroid of slider 2. Sliders 2 and 4 are connected by sliding pairs to cross- shaped slider 6 which has guides wi th axes perpendicular to each other. When link 1 rotates about fixed axis A, centre D of cross-shaped slider 6 describes an ellipse and, simul taneously, rule t-t, secured rigidly to slider 2, envelops the ellipse. The length of the major axis of the ellipse is twice length A͞B of crank 1. Pivot C is placed at one focus of the ellipse and pivot A at its centre. Ellipses of the required parameters can be obtained by adjust ing pivots B and C along slots e and g.
$1061$LG,Ge$