A guide device , fixed to the reference device , enables the apparatus to engage a crankpin, in the course of the orbital motion of the crankpin, and limit the displacements of the first arm and those of the second arm when {HEAD ~ a control device} displaces {TAIL ~ the apparatus} to a rest position 
displaces
A guide device , fixed to the reference device , enables the apparatus to engage a crankpin , in the course of the orbital motion of the crankpin , and limit the displacements of the first arm and those of the second arm when { HEAD ~ a control device } displaces { TAIL ~ the apparatus } to a rest position
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH