Patent ID: 8226081

Claim:
A paper tray of a printer, comprising: a paper tray body; a slide shaft, connected to the paper tray body; a first pick arm, having a first pick roller, pivotally connected to the slide shaft, and the first pick roller in the first pick arm being rotated along with the slide shaft; a second pick arm, having a second paper roller, slidely and pivotally disposed on the slide shaft, and the second pick roller in the second pick arm being rotated along with the slide shaft; and a paper width guide, disposed on the paper tray body, and connected to the second pick arm through a linkage device to drive the second pick arm, wherein the linkage device comprises: a plurality of position sensors, disposed on the paper tray body for sensing a position of the paper width guide; a linkage lever, disposed on the paper tray body, and the second pick arm being pivotally connected to the linkage lever; a motor, driving the linkage lever to drive the second pick arm to slide along the slide shaft; and a controller, coupled between the position sensors and the motor, and driving the motor according to a position of the paper width guide, so as to drive the second pick arm.