Automatic Document Feeder (Adf) - OKIDATA OF1000 Service Manual

Page: 29
Service Guide OF1000
Chapter 2 Principles of Operation

2.2.03 Automatic Document Feeder (ADF)

The automatic document feeder transfers document sheets to the scan unit automatically, one at
a time. The following diagram shows the mechanism used for detecting the leading and trailing
edges of a document.
When a document is placed on the feeder, it is sensed by PC1. This causes the feed rollers to
activate, feeding the document. The document is fed to the PC2 lever, where the leading edge of
the document is detected. When transmit (or copy) begins, the document is fed by the transmit
stepper motor to the start scan position where reading start. The documents trailing edge is
detected when the PC2 lever is released. If another document is on the feeder, the process is
repeated.
The separation rubber holds back the top originals and allows only one document to be fed into
the scanner area. The separation rubber and ADF rollers should be cleaned or replaced according
to the cleaning schedule (in Section 3 of this manual) to assure proper operation.
The ADF capacity is 30 pages of 20 lb. bond. Documents are placed on the feeder image face
side down. When feeding multiple pages, the bottom page is fed first, working toward the top.
Document Leading/Trailing Edge Detection Diagram
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