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10.2.2 Encoder
Usage and InfiniteDPI
Using an external positional encoder allows the print head to determine the precise
speed and location of target materials. This allows precise printing on the substrate,
creating high quality prints. The encoder positional accuracy is the most important
aspect of printing outside of the physical attributes of the ink and substrate. Without
precise positional information high quality printing is difficult to achieve.
The pulses per inch on the positional encoder is the resolution of the encoder that
is attached to the system. The nominal value of the encoder Markem-Imaje supplies is
300 pulses per inch. For best quality printing, this value must be adjusted to match the
actual pulses per inch generated by the encoder. See “Setting up a Printer” for
information on configuring this value.
Alternatively, if the transport for the print medium is relatively stable, the internal
encoder can be used. This value is the actual speed of the transport in inches/second or
cm/second. For best print quality using the internal encoder use a vertical DPI of 300.
This will eliminate blur in the image and speed variations will only cause the printed
image to stretch or shrink.
The “Disable InfiniteDPI” check box causes the printer to print at a small subset of
allowable DPIs. This must be checked if a set of linked pens spans two or more heads to
ensure proper alignment of printed images. If this box is checked, only horizontal
resolutions of 600, 300, 200, and 150 DPI may be used in the job. In addition, the same
DPI must be used for all pens on all heads. Different sets of linked pens may still have
varying widths for their layouts with InfiniteDPI disabled.
The internal edge generator creates a simulated edge sense at the specified
interval after “Start Print” is selected. Although this feature is tied to the positional
encoder some drift may occur and is used primarily for troubleshooting and installation
purposes.
Normally, the Edge Sensor signals an edge when the input value falls from logic
high to logic low. Inverting the edge sensor causes an edge to be signaled when the
input goes from logic low to logic high.
For
information
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