Synthesis of two positions for the coupler
Two boundary positions for this mechanism. The 1st solution is in the left (Green solution) and the 2nd solution is in the right (Red solution).
-Choose the length of the coupler with the slider
-Change the inital positions for the coupler moving the points A1,B1,A2 or B2
-Change the position for the fixed points moving the points O_2 and O_4
-Move the point A to see the positions that the mechanism can take