Hitachi IJ RX2 Technical Manual page 46

4.3.2-3 Method of calculating the conditions which allow product speed
matching
Calculate to find whether the Ink drop use and division factor are the conditions which allow product speed
matching, based on the following.
Print quality improves as the calculation shown below is performed and the Ink drop use becomes smaller.
In addition, when changing Ink drop use, check the print quality.
(1) Set the Character width on the "Print specifications" as below depending on the Ink drop use.
Large
Small
(2) The maximum print scan frequency is found from the following equation by means of the printed character
width and highest conveyer speed. Substitute the value according to the nozzle diameter of the type used at d.
Max. number of print scans [kHz] =
(3) Next, use (Eq. 3) to check if the maximum print scan frequency found from (Eq. 2) can be matched at IJ
printer set print speed.
(Number of vertical dots + character width set value +1) × (Denominator of ink drop use (*1))
● When the result of (Eq. 3) is smaller than the maximum print scan frequency (Eq. 2), product speed
matching is not performed normally and the character width becomes large.
Normal
●In addition, when "Product speed matching error" warning is set, a warning is generated.
In this case, (1) lower the conveyer speed, (2) widen the print character width, or (3) set Ink drop use
larger, so that the maximum print scan frequency becomes smaller than the calculated value of (Eq. 3).
(Makes the IJ printer set print speed faster than the highest conveyer speed.)
(4) The excitation frequency (f) in (Eq. 3) depends on the type of ink used. The excitation frequency by
typical nozzle diameter and ink is shown below. For other inks, refer to the handling guidance of each ink.
Nozzle diameter
4-15 ●Input/output (I/O) specifications
Ink drop use
1/1
1/2
1/3 to 1/16
Highest conveyer speed [m/min]×
Excitation frequency (f)
Character width large
65μm
65μm
65μm
Character width set value
002
001
000
Number of horizontal dots -1
1
×
60
Print length [mm]-d[mm]
Nozzle diameter
65μm
>
(*1) The value is 3 when the ink drop use
Type of ink Excitation frequency (f)
JP-K67
JP-K33
JP-K69
d
0.33
Max. number of print scans [kHz]
is 1/3.
68.9kHz
74.0kHz
68.9kHz
------
(Eq. 2)
[kHz] (Eq. 3)