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Appendix D
Optional Power Paper Stacker
Control Principles
The power paper stacker contains the control detectors (sensors and
switches) described in the following sections.
Transfer Unit Paper Sensor (Paper Moving Sensor)
(PMS)
The transfer unit paper sensor is a photointerrupter that is composed of a light
emitter and receptor and a lever. This sensor is located partway in the paper
guide at the entrance of the power stacker. When paper output from the
printer passes through the guide and kicks the lever, the light passing
between the light emitter and receptor is blocked, causing paper to be
detected.
Light emitter and receptor
Light
674
Lever
Paper
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