Image forming apparatus for preventing paper jam during continuous paper returning operation
 An improved image forming apparatus is provided for performing a printing operation on a series of paper and having a serial paper feeding device and a single sheet feeding device. The apparatus causes no paper jams of the series of paper while returning the series of paper to switch from a serial paper feeding mode to a single sheet feeding mode. The image forming apparatus includes a tractor wheel for conveying a series of paper to a printing area and for retreating the series of paper, and a tractor shaft for pivoting the tractor wheel. The image forming apparatus for feeding the series of paper by a serial paper feeding device causes a certain backlash in an initial pivotal movement of the tractor wheel and the tractor shaft. The image forming apparatus for preventing a paper jam during a retreating of the series of paper further includes an eject roller for feeding or retreating the paper which is conveyed by the serial paper feeding device by a forward and backward rotation thereof; an eject shaft for providing rotational force to the eject roller; an eject gear for causing a backlash at the eject shaft and the eject roller in the initial pivotal movement thereof, the eject gear for providing the rotational force to the eject shaft; a backlash hole formed in a certain location of the eject gear to race for causing the backlash at the eject gear in an initial pivotal movement; and a shaft pin fixed on the eject shaft after being passed through the backlash hole, for transmitting the rotational force of the eject gear to the eject shaft, thereby driving the eject shaft. 
SamSung Electronics Co., Ltd.
B
B65H
inventional
Young-Do
Jung