Paper-End Detection Mechanism - OKIDATA ML172 Series Service Manual

Page: 19
Service Guide ML172/ML182 Series
Chapter 2 Principles of Operation

2.2.6 Paper-end Detection Mechanism

REAR PAPER FEED
When paper is installed in the printer, it prevents the near-end lever from falling into the groove of the
paper chute and platen, the paper-end sensor is on.
When the printer runs out of paper, the near-end lever falls into the groove of the paper chute and the rear
part of the near-end lever turns off the paper-end sensor, paper-end is detected.
Paper-end is detected when the end of the remaining paper is about 1 inch (25.4 mm) from the printhead
position.
BOTTOM PAPER FEED
When paper is installed in the printer, it prevents the bottom near-end lever from falling into the hole in the
bottom paper guide. That is, the wedge on the bottom near-end lever pushes down the projection of the
near-end lever, and the paper-end sensor is on.
When the printer runs out of paper, the tip of the bottom near-end lever falls into the hole in the bottom
paper guide so that the rear part of the near-end lever turns off the paper-end sensor, and thus paper-end
is detected.
Also in this case, paper-end is detected when the end of the remaining paper is about 1 inch (25.4 mm)
from the printhead position.