A change gear system 3, wherein {HEAD ~ the rotating frame} is attached to the stationary member by {TAIL ~ means} of a one way engagement clutch so that it is rotated only in one direction 
A change gear system 3 , wherein { HEAD ~ the rotating frame } is attached to the stationary member by { TAIL ~ means } of a one way engagement clutch so that it is rotated only in one direction
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH