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REV.-A
2.4.2.7 Print Head
This printer employs the on-demand method for the print head. With the on-demand method, ink is
injected on demand. This means ink is usually charged inside the print head, ready for injection, in
coordination with print timing. After an injection of ink, ink is recharged for the next injection.
Another method, called the continuous method, keeps a steady supply of ink on the print head and
attempts to eliminate the problem of ink drying on the head.
A print had that uses the continuous method of ink supply requires a more complicated mechanism.
The on-demand type mechanism increases the injection force at the nozzle for printing. The continuous
type printer, on the other hand, shuts off unnecessary nozzles. The continuous type printer has a higher
running cost because a steady flow is ink is required. Some printers try solve this problem by re-cycling
unused ink.
Printer Head Specifications
Print method:
Nozzles:
Nozzle
config uration:
Drive conditions:
On-demand ink jet
24 nozzles
Arranged alternately
Ink temperature driving voltage follow control (See Table 2-6)
Table 2-6. Drive Voltage
Temperature ('q
5
25
40
Voltage (V)
150-160
1 15-1 2 1
93-100
Applied pulse width:
Discharging pulse width:
Interval:
Charging pulse width:
Response frequency:
Ink dot weight:
Platen gap:
Remarks:
70±5 f-Lsec. (discharging pulse width
+
interval)
62±5 f-Lsec.
8 f-Lsec.
47.5±7.5 f-Lsec.
2.97 kHz
approx. 0.5 f-Lg/dot (room temperature)
1.2 mm ± 0.1 mm (distance between head nozzle and platen).
The platen gap can be manually adjusted up to 1.8mm for printing
on thicker paper (such as envelopes). However, printing quality is not
guaranteed when the platen gap exceeds 1.3mm.
2-53
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