How assembly this parts for DMU Kinematics

It is not possible to simulate this mechanism , because mechanism become over-constraint when joints are applied...

  1. Step 1:

    when the part 6 is rotating

  2. Step 2:

    distance between part1 and part 4.1 increases or decreases,

  3. Step 3:

    so there is some link missing between the parts which can compensate the distance.