Rev. A
Operation Principles 2-11
EU-T532/T542 Technical Manual
Confidential
Black marks are detected through changes in output level from the reflective photo sensor. The
changes in reflectivity between the pre-printed black marks and blank areas of the thermal
paper cause the amount of light returning to the sensor to vary; then the sensor output level is
also varied as shown in Figure 2-15. These variations are used to detect the black mark. Since the
relationship between the black mark and the print position can be specified in the printer set up,
detecting the black mark permits the correct positioning of the paper.
Figure 2-15 Black mark detecting operation
Autocutter Mechanism
This mechanism consists of the fixed blade mechanism, the movable cutter blade mechanism
and the emergency cutter mechanism.
The basic principle of the autocutter mechanism is an application of the scissors principle, where
the paper is cut by two crossing blades. A configuration which allows the two blades to separate
has been adopted so that the
fixed blade, H
separates from the
movable cutter blade, full, H
when the
platen
is open.
Fixed blade mechanism
This mechanism is mounted on the frame platen unit. This configuration consists of the
fixed
blade, H
which cuts the paper directly, the
spring, fixed blade
which stabilizes the vertical
positioning of the
fixed blade, H
, and the
cover, fixed blade
which covers the
fixed blade,
H
and is a paper guide as well as makes the operation to open the
platen
safe.
Figure 2-16 Fixed blade mechanism
black mark detector signal
conductive confirmation
black mark detection
spring, fixed blade
fixed blade, H
cover, fixed blade
frame, platen unit
Содержание EU-T532
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