Olivetti JP 90, Руководство по обслуживанию

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681640J
1-7
JP 90 - Service Manual
Fig. 1-3c - EXPLODED VIEW
OF THE PRINT HEAD
Fig. 1-3a - INK-JET PRINT
HEAD AND INK CARTRIDGE
Fig.1-3 Ink-Jet Print Head
1.7 INK-JET PRINT HEAD OPERATION
Ink-Jet Print Head:
The ink-jet print head is made up of an interchangeable resin shell containing 50 nozzles and an electrical
circuitry with 50 resistive heating elements (see Fig. 1-3a).
The nozzles are assembled on a nichel and gold compound referred to as electroformatted. They They
have a conical shape as shown in figure 1-3b.
The ink is contained in a disposable cartridge mounted inside the shell hosting the nozzles. The ink flows
to the nozzles from the cartridge through small channels in the print head's resin layer. This layer is electrically
insulated from the resistive heating elements.
Each resistive heating element corresponds to a nozzle and is connected to the head's external electric
contacts.
NOZZLE
HEATING ELEMENT
140-150µm
50µm
HEATING ELEMENT -
NOZZLE PAD
FLEXIBLE ELECTRIC
GRID
SPONGE
OUT OF INK SENSOR
SUPPORT PLATE
COVER
INK PAD
Fig. 1-3b - NOZZLE CROSS
SECTION
OUT OF INK SENSOR
SUPPORT PLATE
SHELL