Paper feeding device and paper skew judging module applied therein

A paper feeding device for feeding paper, comprising:

• a lower cover;
• an upper cover pivotally connected to the lower cover, a paper feeding channel being formed between the upper cover and the lower cover;
• at least one motor mounted to the lower cover;
• a feeding roller assembly pivotally connected to the lower cover and projecting into the paper feeding channel, the feeding roller assembly being connected with the at least one motor, the at least one motor driving the feeding roller assembly to feed the paper into the paper feeding device along a paper feeding direction;
• and
• a paper skew judging module disposed to the lower cover for judging whether the fed paper is skewed or not, the paper skew judging module having an infrared light emitter, an infrared light receiver, a cantilever arm, a sensing roller and a lens, the infrared light emitter being mounted to the lower cover, the infrared light receiver being mounted to the lower cover and being disposed opposite to the infrared light emitter for receiving infrared light emitted from the infrared light emitter, the cantilever arm being rotatably assembled to the lower cover, the sensing roller being pivotally connected with a top end of the cantilever arm, a center axis of the sensing roller extending along a direction perpendicular to the paper feeding direction, a top of the sensing roller projecting into the paper feeding channel, the lens being fastened to the cantilever arm, and disposed between the infrared light emitter and the infrared light receiver, different areas of the lens having different photopermeabilities, the infrared light receiver being used for receiving infrared light emitted from the infrared light emitter and penetrating through the lens.