A power supply unit for a fusing roller of an electrophotographic image forming
apparatus, which is electrically connected to a heat-generating portion for generating
heat to raise the temperature of the fusing roller to an appropriate level at which
a toner image is fused and for transmitting electric current from an external power
source to the heat-generating portion, includes: a connecting portion installed
at a center of each of two end caps fit around ends of the fusing roller and electrically
connected to the heat-generating portion; a holder connected to the connecting
portion, the holder installed in a frame, the frame supporting or mounting the
fusing roller, and an elastic unit for providing elastic force to make the holder
elastically contact the connecting portion. The power supply unit provides improved
durability and operating safety under electrical and mechanical stresses caused
by current, residual heat and thermal impacts.
