Patent 7686157 was granted and assigned to Murata Machinery on March, 2010 by the United States Patent and Trademark Office.
A belt conveyor includes right and left detection rollers outside ends in a width direction of a belt. Right and left correction rollers are disposed on right and left sides on a rear face of the belt. When one of the detection rollers is pressed by the belt, the corresponding correction roller is inclined from the pressed detection roller down to a center of the belt, thereby correcting the meandering belt.