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