XJ128 and XJ128 Plus Printhead
XJ128 Guide to Operation
Xaar Document no: D031010302 Version A
Page 15
4 Mechanical Guide
Before beginning a design phase with Xaar printheads, please ensure that you have obtained the
latest printhead drawings from Xaar Sales Engineering. See section 11 of this document for further
information.
4.1 Channel numbering and side definition
Looking directly at the nozzle plate on the printhead, with the nozzles pointing towards you and the
ink inlet pointing away from you, nozzle 1 is on the right side of the printhead.
“
Top
”
means position closest to cover side.
“
Bottom
”
means position closest to chassis side.
Figure 4.1 - Printhead side definition
There are a total of 134 nozzles viewable on the nozzle plate. The active nozzles are numbered 1 to
128. Nozzle 1 is referenced to the datum features on the printhead. Adjacent to nozzle 1 are 4
“
guard
”
or
“
dummy
”
nozzles
. These are shown in figure 4.3. Adjacent to nozzle 128 are 2
“
dummy
”
nozzles. All dummy nozzles are non functional and cannot be activated. When looking towards the
nozzle plate, on the printhead, the nozzles are numbered from right to left, as shown in figure 4.1.
Left side
Right side
Back side
Front
Top side
Dummy
nozzles
Dummy
nozzles
Print nozzle #128 (last)
Print nozzle #1 (first)