Media Feed Principles - Intermec EasyCoder PF2i Service Manual

7.9 Media Feed Principles

Intermec EasyCoder PF2i, PF4i, and PF4i Compact Industrial—Service Manual
Fingerprint only
The Start and Stop Adjust parameters in the Fingerprint Setup Mode
control how the media will be positioned in relation to the printhead when
the printing starts and after the printing is completed, respectively. By
default, the Start and Stop Adjust parameters are both set to 0, which is
suitable for tearing off the media against the tear bar, for example between
labels or at the perforation in a pre-perforated continuous stock. However,
because the dot line on the printhead is situated 14.4 mm (0.57 inches)
back from the tear bar, the printing will not start at the top of the label but
further back along the media path.
14.4 mm
Tear Bar
Note: Due to several factors, media feed measurements are not exact and
may vary somewhat between applications and individual printers. There
is inevitably a small amount of slippage between media and platen roller,
which in its turn is affected by printhead pressure, type of media or liner,
thickness of the media, roll size, type of media supply device, etc. The
platen roller may be worn, giving it a slightly smaller diameter and/or less
friction. There is also a certain amount of inexactness in the media feed
mechanics and belts and so on. Therefore, the operator cannot expect to
reach exact Start and Stop Adjust values simply by calculation. Use the
measurements given in this chapter to calculate rough starting points and
use the trial-and-error method to fi nd values that give the desired result.
Note: All calculations and feed adjust values in this chapter (7.9) refer to 8
dots/mm (202.3 dpi) printheads.
Chapter 7—Print Mechanism
Default (tear-off)
Start Adjust: 0
Stop Adjust: 0
Dot Line on Printhead
Label Stop
Sensor
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