Image recording apparatus with belt-type transfer device

An image recording apparatus comprising:

• (a) a rotating photoreceptor drum on which a toner image is formed;
• (b) a transfer belt charged by a corona charger disposed on a rear side of said transfer belt, said transfer belt transferring said toner image onto a recording sheet and conveying said recording sheet;
• (c) a driving roller for driving said transfer belt, said driving roller having first and second end portions and rotational shaft portions positioned at said first and second end portions thereof, one of said rotational shaft portions being connected with a driving source for driving said driving roller;
• (d) a driven roller having first and second end portions, said driven roller being driven by said driving roller as said driving roller drives said transfer belt, said driven roller having rotational shaft portions provided at said first end second end portions thereof;
• (e) a frame for supporting said rotational shaft portions of both said driving roller and said driven roller, such that said transfer belt is stretched in a loop around both said driving roller and said driven roller;
• and
• (f) a stationary housing for rotatably supporting said frame about a plurality of bearings and for supporting said rotational shaft portions of said driving roller, wherein a first one of said plurality of bearings is fixedly provided to said stationary housing to support that one of said rotational shaft portions of said driving roller which is connected with said driving source, a second one of said plurality of bearings is movably provided relative to said stationary housing, said second one of said plurality of bearing supporting the other one of said rotational shaft portions of said driving roller.