Rev. A
Operation Principles 2-9
EU-T532/T542 Technical Manual
Confidential
The
transparent photo
sensor is in a high state (HI) when the paper is present, and in a low
state (LOW) when the paper is not present because the
lever, paper detector
blocks light to
the sensor. When the end of the thermal paper passes through the paper guide, the
lever,
paper detector
operates as shown in Figure 2-11. At this time, the output level from the
transparent photo sensor
varies as shown in Figure 2-12, then the absence of paper is
detected. When the semi-autoloading function is used, the insertion of paper changes the status
from “no paper” to “paper.” Since the output level changes from LOW to HI, the status changes
to “paper”; then the semi-autoloading function is initiated.
Figure 2-11 Paper-end detector mechanism
Figure 2-12 Paper-end detector operation
platen
thermal head
transparent photo
sensor
lever, paper detector
paper guide, straight, front
frame, base
paper
<paper-present condition>
<paper-absent condition>
paper guide, straight, back
paper-end signal
conductive confirmation
paper-end detection
Содержание EU-T532
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