An emergency power shutdown management system comprises a programmable logic controller, relays coupled to the outputs of the PLC for shutting down electrically operated equipment, and indicators for indicating the status of the EPSMS and the controlled equipment. This information indicates a printing-completion notification function possessed by the image forming apparatus. Differently polarized waves which are reflected back from the person are collected and measured. rollers, that extend between the rotary gear and respective tong covers. The topmost sheet material is fed by the rotation of the sheet feed roller in the counter-clockwise direction and supplied beyond the tilt member by friction with the sheet feed roller, whereas the next sheet material is blocked by the tilt member due to less friction between the sheet materials, thereby preventing multiple sheet feeding. At temperatures below the LCST, the functional groups are hydrophobic.