The drum 1 is driven to rotate at a constant speed in the direction indicated by {HEAD ~ the arrow} by {TAIL ~ means} of a main motor 2 through a power transmission mechanism  
The drum 1 is driven to rotate at a constant speed in the direction indicated by { HEAD ~ the arrow } by { TAIL ~ means } of a main motor 2 through a power transmission mechanism
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH