Coupling mechanism 10 includes {HEAD ~ a driving arm} 11 directly coupled to {TAIL ~ output shaft} 5, a driven arm 12 directly coupled to shaft 3, and an elastic coupling member 13 for elastically coupling driving arm 11 to driven arm 12 
directly coupled to
Coupling mechanism 10 includes { HEAD ~ a driving arm } 11 directly coupled to { TAIL ~ output shaft } 5 , a driven arm 12 directly coupled to shaft 3 , and an elastic coupling member 13 for elastically coupling driving arm 11 to driven arm 12
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL 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