Patent ID: 8240593

Claim:
A paper feeding device that feeds a sheet of a paper roll to a printing device, comprising: two side plates vertically arranged along both side surfaces of the paper roll; a plurality of notches formed in each of the side plates, the plurality of notches being capable of bearing-supporting paper rolls having different diameters in an unused state; a near end sensor for detecting a remaining amount of the paper roll; and a linear groove formed in one of the side plates and in which the near end sensor is slidably disposed to undergo sliding movement in two directions to move close to and away from the paper roll bearing-supported by each of the notches, the groove being formed so that a longitudinal axis of the groove passes through a midpoint of a straight line connecting a rotation center of a paper roll bearing-supported by one notch of the plurality of notches and a rotation center of a paper roll bearing-supported by another notch of the plurality of notches and overlies another straight line which is vertical to the straight line connecting the rotation centers of the paper rolls.