Abstract: A toner cartridge includes a customer replaceable unit monitoring (CRUM) apparatus to store error information of a toner injection process of the toner cartridge using a toner refill apparatus. Based on the error information not being stored in the CRUM apparatus, an availability of a refill operation of the toner cartridge is identified based on a predetermined first reference value and an amount of toner detected in the toner cartridge, and, based on the error information being stored in the CRUM apparatus, the availability of the refill operation of the toner cartridge is identified based on a predetermined second reference value and the amount of toner detected in the toner cartridge.

Abstract: Disclosed is a toughened polyoxymethylene resin composition, including a polyoxymethylene resin, a polyether-ester block copolymer derived from copolymerization of a hard segment including a dicarboxylic acid component and a glycol component and a soft segment including a poly(tetramethylene oxide)terephthalate unit, and a modified polyethylene polymer, which is advantageous in terms of high mechanical properties with an Izod notch impact strength of 10 kg-cm/cm or more and a tensile strength of 550 kg/cm2 or more, while maintaining a dot impact strength of 5 J or more. Hence, molded articles using the above resin composition are improved in resistance to impact, wear and friction, and thus, can be usefully applied to gears or bearings having low noise.