Oce 3121 Technical & Service Manual page 678

The stapler moves away from the paper and returns to the home position.
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The guide bar moves to the escape position.
The bin unit moves down one bin.
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Operations 2 through 5 are repeated for each bin to complete the stapling.
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The guide bar moves to the home position.
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528 TSM Océ 3121 Functional description of the sorter