a sheet feeding device used for an image forming device which has a print part , such as the laser printer . a control part drives a separation roller installed under the print part and the paper supplying roller and supplies the printing paper to a resist roller individually . when a predetermined time passes afterwards , the control part drives the resist roller and transports the printing paper to the print part . in this case , a curve part enables miniaturization of the entire device as a result of being installed in a vertical part of the sheet guide .