Patent ID: 7360760

Claim:
A method for using a paper tray comprising a sidewall, a rotating member and a resilient element, the sidewall comprising a through hole, the door plate pivotally connected on the sidewall, the rotating member disposed in the through hole and comprising an engagement portion, the engagement portion comprising a first curved surface and a second curved surface, the resilient element disposed between the rotating member and the sidewall, comprising the steps of: inserting the paper tray into a printer, wherein the rotating member rotates around a Y-axis by abutment with the printer, and the first curved surface of the engagement portion contacts the door plate; rotating the door plate toward the exterior of the paper tray and around an X-axis, such that the door plate slides on the first curved surface of the engagement portion and the rotating member rotates around the Y-axis to allow the door plate to slide across the edge of the second curved surface and separate from the rotating member, wherein a predetermined included angle exists between the X-axis and the Y-axis; and rotating the door plate toward the interior of the paper tray and around the X-axis, such that the rotating member rotates around the Y-axis to allow the door plate to sequentially slide across the edge of the second curved surface and across the first curved surface.