XJ128 and XJ128 Plus Printhead
XJ128 Guide to Operation
Xaar Document no: D031010302 Version A
Page 56
9.2.8 XJ128 image transformation
The XJ128 printhead is designed to operate at specified mounting angles. This section explains how
the user should incorporate an image-slanting feature to the application software. In order to achieve
a single pixel line with all the printed dots aligned, it is necessary to angle the printhead as the
nozzles are positioned in a single row on the nozzle plate.
Symbol
Definition
hr
Horizontal resolution
vr
Vertical resolution
hru
Horizontal resolution unit (1/hr)
vru
Vertical resolution unit (1/vr)
Natural print direction
The natural print direction is defined as the direction with nozzle 1 as the
foremost nozzle
Mounting angle
The angle between a line through the centre of all nozzle plate holes and a
line parallel with the print direction
Table 9.1
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Definitions for image transformation
9.2.8.1 Printing angle and horizontal / vertical resolution ratios
Figures 9.12 and 9.13 show the relationship between the horizontal resolution (hr) and vertical
resolution (vr) when using the XJ128/200 and XJ128/360 printheads. The corresponding mounting
angles for the respective printheads are derived from these relationships. The nozzle positions are
superimposed on the figures to show the relative positions of the printed dot position to the printhead
nozzles.
Figure 9.12
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XJ128/360 rear view