In order to improve the permeance and strengthen the magnetic flux density, there exists a method of narrowing {HEAD ~ the breadth} of {TAIL ~ a magnet} across the circumference of the roller from a distance extending toward the center thereof 
of
In order to improve the permeance and strengthen the magnetic flux density , there exists a method of narrowing { HEAD ~ the breadth } of { TAIL ~ a magnet } across the circumference of the roller from a distance extending toward the center thereof
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 REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH