OKIDATA ML320 Turbo Service Manual page 46

(4) Top line print mechanism (See Figure 2-16.)
The top edge of the sheet is protected by the ribbon protector so that it can stop at a position very close to
the printhead (0 tear-off position) to start printing at the top of the sheet without causing it to crumple or
curl up.
Printing starts at the top of the sheet, and continues uni-directionally until the top edge of the sheet gets to
the inside of the pull-up roller cover.
After that, printing continues bi-directionally.
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