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.
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.
Key components
Sensors
Bin full sensor
Input sensor
Pass through
sensor
Index sensor
Trailing edge
sensor
Media present
sensor
Trailing edge
sensor
Media present
sensor
Duplex sensor
Fuser exit
sensor
Index sensor
MPF paper present
sensor
Trailing edge sensor
Detects the media’s trailing edge as it passes the pick tires. Among other capabilities, this sensor can be used to
determine the paper size sensor and the media stack height.
MPF sensor
Detects the presence of media in the MPF tray.
Media present sensor
Detects the presence of media in the tray.
7015
Appendix C: Theory of operation
388
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