Patent ID: 7828239

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 sides of the paper roll; a plurality of notches formed in each of the two side plates and which are 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 groove formed in one of the two side plates and in which the near end sensor is slidably disposed to undergo slidable movement in a radial direction of the paper rolls bearing-supported by the notches of the two side plates, the groove comprising a plurality of first grooves and a second groove connecting the plurality of first grooves, the plurality of first grooves being formed such that distances between rotation centers of the paper rolls and a sensor portion of the near end sensor are the same when the near end sensor is brought closest to the rotation centers of the paper rolls, and the distances between the rotation centers of the paper rolls and the sensor portion of the near end sensor are the same when the near end sensor is furthest away from the rotation centers of the paper rolls, and the second groove being formed such that the near end sensor rotates along the side plate and changes direction as it slides along the second groove.