An electroconductive grease-filled bearing is a rolling bearing comprising an
inner race 11 and an outer race 12, both of the races being coaxially
provided, a plurality of steel balls 13 radially being retained between
track surfaces of the races, the bearing rotatably supporting the edge of heating
roll 6a in the fixing section of an electrostatic transfer copying
machine, fixed to the inner periphery of inner race 11, an electroconductive
grease to be filled between the track surfaces comprising a fluorocarbon oil as
a base oil and graphite (or together with polytetrafluoroethylene) as a thickening
agent. The electroconductive grease has a distinguished electroconductance so as
to effectively discharge the static electricity, and has a distinguished heat-resistant
durability even at elevated temperatures, and also prevents revolution failure
due to the increased torque caused by an excessive lowering in the grease consistency,
while maintaining the good electroconductance. The bearing is most suitable for
rotatably supporting a photosensitive drum or a heating roll or a pressing-heating
roll in the fixing section in an electrostatic transfer copying machine, and is
also effective for stabilization of printed images.
