Paper feeding device

Abstract

A paper feeding device comprises a supporting frame, a pickup roller assembly, a paper blocking unit, a base and a sensor. The paper blocking unit is placed beside the pickup roller assembly, having a paper blocking element connected to the supporting frame, including a connecting portion, the connecting portion extends downwards to form a paper blocking arm. The sensor is located in the base, having an emitting arm and a receiving arm. The lower portion of the paper blocking arm can be located between the emitting arm and the receiving arm or depart from them for turning off/on the sensor. The paper feeding device decides whether the paper is provided on the base by the turn on/off status of the sensor, so an additional obstructer is avoided. Compared with conventional paper feeding device, the structure of the present invention is simple, and it is convenient to assemble.

1 . A paper feeding device, comprising:
 a supporting frame, having
 a pair of opposite supporting boards mounted on the inner surface of the supporting frame; 
 a retaining portion projecting from the inner surface of the supporting frame, the retaining portion including a pair of retaining boards parallel to each other, a retaining hole being opened in the retaining board; 
   a pickup roller assembly mounted between the supporting boards, picking up and then transferring papers into the paper feeding device;   a paper blocking unit placed beside the pickup roller assembly, having a paper blocking element, the paper blocking element including a connecting portion with a pair of positioning pillars protruding from the two sides, the positioning pillar rotatablely connected to the retaining hole of the retaining portion of the supporting frame, the connecting portion extending downwards to form a paper blocking arm;   a base having a paper loading base; and   a sensor located in the base for sensing whether a paper is loaded on the paper loading base, having an emitting arm and a receiving arm;   wherein the lower portion of the paper blocking arm can be located between the emitting arm and the receiving arm or depart from the emitting arm and the receiving arm.   
   
   
       2 . The paper feeding device as claimed in  claim 1 , wherein the front end of the connecting portion of the paper blocking element extends upward to form a restricting arm, a restricting projection is set between the retaining boards, the restricting arm leaning against the restricting projection. 
   
   
       3 . The paper feeding device as claimed in  claim 1 , wherein the back end of the connecting portion of the paper blocking element extends downward to form the paper blocking arm at the left, so an opening is formed at the right of the paper blocking arm, the pickup roller assembly includes a roller frame, the paper blocking unit further comprises a projection protruding from the sidewall of the roller frame, the projection can stop at the connection portion of the paper blocking arm or pass through the opening of the paper blocking arm. 
   
   
       4 . The paper feeding device as claimed in  claim 3 , wherein the lower portion of the paper blocking arm is cut off at the left and thus forms a board-shaped obstructer at the right, the obstructer located between or depart from the emitting arm and the receiving arm. 
   
   
       5 . The paper feeding device as claimed in  claim 1 , wherein the receiving arm is parallel to the emitting arm and is connected by a connecting arm mounted on an electrical circuit board.