From Bridge Unit Assembly To Punch - Lexmark X850e Service Manual

From bridge unit assembly to punch

The media fed from the bridge unit assembly is fed into the finisher by the media entrance roll assembly located
on the entrance section of the finisher which is driven by the drive motor (entrance/paddle).
The media route inside the finisher is determined by the finisher diverter gate.
The finisher diverter gate is activated by the finisher diverter gate solenoid controlled by the printer.
The media is further fed in the finisher by the two upper media transport roll assemblies, or the buffer roll
assemblies that are driven by the motor (buffer/transport), and passes through the punch unit.
The sensor (finisher media entrance) becomes low upon detecting media. After a certain amount of time has
passed and the level has transitioned to high, the motor (buffer/transport) that drives the upper media transport
roll assembly or the buffer roll assembly starts reverse rotation.
The media is returned to the punch unit by the upper media transport roll assembly or the buffer roll assembly,
and is stopped with its end gently pressed against the three punch media stopper assemblies.
The three punch media stopper assemblies in the punch unit drop to let media pass through when media is fed
to the exit (while the motor (buffer/transport) is rotating forward), but rise when media is returned (while the
motor (buffer/transport) is rotating reversely) to stop the media.
Thus, punch hole positions in the media feed direction are determined.
Drive motor (buffer/transport)
Punch unit
Finisher diverter
gate solenoid
Drive motor
(entrance paddle)
Upper media transport roll assembly—driven by
drive motor (buffer/transport)
Punch unit
Sensor (finisher
media entrance)
Media
From bridge unit assembly
Finisher media entrance
roll assembly—driven by
drive motor (entrance/paddle)
Sensor (finisher
Finisher media
media entrance)
entrance roll
assembly
Buffer roll assembly—
driven by drive motor (buffer/transport)
Upper media transport
roll assembly
Punch unit
Finisher diverter gate
Buffer roll assembly
Finisher diverter gate
General information
7500-XXX
1-27