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79 User Manual
Appendix 1:Installations & Setting Up
The maximum line speed calculated above should be compared with that expected for the production
line - use the section “Line Speeds Per Product Frequency” later in this manual if necessary.
The line speed may also be limited by the encoder signal response:
Max. Encoder Speed (m/s) = Encoder Pitch (mm) x Specified Frequency (kHz)
Where:
Encoder Pitch = value from table in Step 2 for encoder/gearing
Specified Frequency = Limiting Signal Frequency (see the following table).
The specified frequency varies with encoder type:
This gives the following maximum encoder speeds for standard EC-JET encoders and wheels:
The maximum encoder speed must also be higher than the production line maximum speed.
Referring back to the example, the actual raster pitch is 0.360 mm (Step 2) and the number of rasters
is 102 (Step 1).
Printed Message Length (mm) = 102 x 0.360 (mm)
= 36.72 mm
This will fit in the target area of 38 mm.
The message is printed using the Midi 7 GEN STD raster with a raster rate of 5.33 kHz.
Max. Line Speed (m/s) = 0.360 mm x 5.33 kHz
= 1.918 m/s.
This is slightly higher than the quoted maximum line speed for the raster, achieved at the expense of
a small gap between the printed drops.
The encoder/gearing chosen has an encoder pitch of 0.040 mm (Step 2), and a specified frequency of
80 kHz from the table above.
Max. Encoder Speed (m/s) = 0.040 mm x 80 kHz
= 3.200 m/s
This will not limit the expected printable maximum line speed.
Step 4: Enter the Print Width Parameter
The “Print Width” parameter is used by the printer to generate the pitch factor and print rasters at the
actual pitch calculated in Step 2. Print Width is a setting accessed from the SETUP menu. The way it
can be changed is described
in “Changing the System Setup”.
The relationship between Print Width and Pitch Factor is:
Print Width = Pitch Factor - 1
The requirement to subtract 1 arises from the printer software operation.
Referring back to the worked example, the pitch factor calculated at Step 2 is 9.
Therefore, the Print Width parameter entered at the printer must be 9 - 1 = 8.
Encoder Type
Specified Frequency
(kHz)
20.0
20.0
EJ118
2500p.p.r.
5000p.p.r.
Encoder
2500p.p.r.
5000p.p.r.
500 mm circ.
4.0m/s
2.0m/s
333 mm circ.
2.66m/s
1.33m/s
200 mm circ.
1.6m/s
0.8m/s
EJ119
VOD PRESSURE PHASE
00000
000
Jet Off
2006-03-24 14:01:38
SET UP
> Password
> Print Height
> Scale Height
> Print Width
EJ120
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