Paper-feeding mechanism

Abstract

The paper-feeding mechanism includes a duplex drive roller disposed on a terminal end of a feeding path of an image-forming device for feeding paper and on a side of an output tray, a first idle roller for conveying the paper back to the output tray with the duplex drive roller after a single side of the paper is printed, a second idle roller for conveying the paper back to the output tray with the duplex drive roller after double sides of the paper are printed, and a stop means installed between the terminal end of the feeding path and the output tray for switching to a shut position to stop the paper when the paper is driven back to the feeding path and for switching to an open position when the paper is driven to the output tray after the double sides of the paper are printed.

1 . The paper-feeding mechanism utilized for an image-forming device comprising:
 a duplex drive roller disposed on a terminal end of a feeding path of the image-forming device and disposed on a side of an output tray for feeding paper;   a first idle roller for conveying the paper to the output tray with the duplex drive roller after a single side of the paper is printed;   a second idle roller for conveying the paper to the output tray with the duplex drive roller after double sides of the paper are printed; and   a stop means installed between the terminal end of the feeding path and the output tray for switching to a shut position to stop the paper when the paper is driven back to the feeding path and for switching to an open position not to stop the paper when the paper is driven to the output tray after the double sides of the paper are printed.   
     
     
         2 . The paper-feeding mechanism of  claim 1  wherein the stop means is pivoted on the terminal end of the feeding path. 
     
     
         3 . The paper-feeding mechanism of  claim 1  further comprising a restoring means connected to the stop means for turning the stop means from the open position to the shut position. 
     
     
         4 . The paper-feeding mechanism of  claim 2  further comprising a shaft connected to the stop means and pivoted to the image-forming device for driving the stop means to rotate. 
     
     
         5 . The paper-feeding mechanism of  claim 3  wherein the restoring means is a torsional spring. 
     
     
         6 . The paper-feeding mechanism of  claim 5  wherein the torsional spring comprises:
 a pushing part contacting against the stop means; and   a fixing part fixed on the image-forming device.   
     
     
         7 . The paper-feeding mechanism of  claim 3  wherein the restoring means is a weight stack. 
     
     
         8 . The paper-feeding mechanism of  claim 7  further comprising a shaft connected to the stop means and pivoted to the image-forming device for driving the stop means to rotate wherein the weight stack is connected to an end of the shaft. 
     
     
         9 . The paper-feeding mechanism of  claim 1  wherein the stop means comprises an arched part and an arched cavity of the arched part is disposed opposite to an exit direction of the paper.