Media Handling Components; Main Drive Gearbox; Autocompensator Mechanism (Acm) - Konica Minolta bizhub 4020 Service Manual

bizhub 4020/3320 Service Manual

12.4 Media handling components

12.4.1 Main drive gearbox

The gearbox supplies all mechanical power requirements of the printer. Its motor, through several gears,
transfers power to following paths: photoconductor drum, transfer roll, fuser, paper exit, input, duplex,
and MPF.
Aside from providing rotational motion to rollers and feeders, the gearbox must also ensure that the
print image is not distorted during the whole process. It must also provide easy and effective means to
cut or break the transfer of motion when taking the cartridge unit out of the machine, or when clearing
jammed sheets through its linkage system.

12.4.2 Autocompensator mechanism (ACM)

The fundamental function of the ACM is to pick and feed a single sheet of media and accurately deliver
it to the downstream paper path. The pick arm is counterbalanced to provide a priming force throughout
the entire range of paper levels in the tray. When media is picked, a subsequent sheet is not picked
until the previous sheet's trailing edge is detected by the trailing edge sensor. Once the trailing edge of
the media is detected, and the minimum interpage gap is satisfied, the next sheet will be picked.
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