Plate cams 1 and 2 rotate about fixed axes A and P independently of each other. Followers 3 and 4 oscillate about fixed axis C and carry rollers 7 and 8 which roll along the contours a and b of cams 1 and 2. Links 5 and 6 are connected by turning pairs D and B to followers 3 and 4, and by turning pair A to each other. The lengths of the links comply with the conditions: C͞B=C͞D and D͞A=B͞A. Rollers 7 and 8 are held in contact with cams 1 and 2 by a flat spring. By proper design of contours a and b of cams 1 and 2, and by suitable selection of the angular velocities of the cams, point A can be made to trace various paths, for example, to draw the figure 5 as shown.
$3197$CmL,Ge$