Method of detecting feeding status and width of paper

A method of detecting feeding status and width of paper is disclosed in this present invention, steps of the method include: step a, using at least one infrared light transmitter to transmit infrared light signals; step b, using a light-gathering element to gather together the infrared light signals transmitted by the infrared light transmitter; step c, using a light receiver to receive the infrared light signals gathered together by the light-gathering element, when paper is fed forward, the paper will be located between the infrared light transmitter and the light-gathering element, and will cover a part of the light-gathering element so as to cut off a part of the infrared light signals, how many infrared light signals the light receiver received will be changed, a feeding status and a width of the paper is determined according to how many infrared light signals the light receiver received.