Synthesis of two positions for the coupler
Two possible solutions for this mechanism. The 1st solution is in the left (Green solution) and the 2nd solution is in the right (Red solution).
You can choose the length of the coupler and modify the positions of the mechanism by clicking on the points A1,B1,A2 or B2. You can also move points O2 or O4 around their straight line to modificate the mechanism. Move the point A to see the positions that the mechanism can take.