Shpf Hpu Transport Drive - Lexmark M52 Series Service Manual

SHPF HPU transport drive

Transport rollers receive the paper entering the finisher, and then move the paper in the positions where hole
punching may be required. The paper is detected by the sensor (HPU leading edge) as it passes between the
two transport rollers. Before the paper is fed out by the exit rollers, it is detected by the sensor (HPU trailing
edge). The sensor (light array) also detects the paper to ensure proper hole punching.
The motor (HPU transport) not only drives the transport rollers, but the auger in the hole punch box as well.
When the hole punch box auger rotates, the chad inside the box is more evenly distributed to maximize the
container capacity.
5 4
6 1
1 Transport roller 1
2 Sensor (light array)
3 Transport roller 2
4 Sensor (HPU leading edge)
5 Sensor (HPU trailing edge)
6 Motor (HPU transport)
7 Hole punch box auger
Theory of operation
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