Encoder And Print Width Problems - EC-PACK EC-JET 1000Pro Manual

Guangzhou EC-PACK Packaging Equipment Co., Ltd.
EC-JET 1000Pro Continuous Inkjet Printer
Max. Line Speed (m/s) = 0.375 mm x 5.33 kHz
= 2 m/s.
The Max. Encoder Speed of the 5000ppr encoder/gearing chosen in Step 2 is 3m/s
This will not limit the expected printable maximum line speed.
If we chose 2500ppr or 10000ppr encoder with EC-JET standard wheel, The Max. Encoder Speeds are
only 1.5m/s will 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 10.
Therefore, the Print Width parameter entered at the printer must be 10 - 1 = 9.
This will print one raster for every 9 encoder pulses.
Step 5: Check the Print Performance
Having entered the print width and created a message using the character size and raster from the
calculation, prints must be taken at a variety of normal running speeds to confirm the settings. This must
include the maximum running speed.
Note: If the customer has strict requirement on the message width, necessary to calculate the
drop pitch as requirement and design encoder wheel diameter rather than using EC-JET standard
encoder wheel and choose the right encoder, check if suitable following Step 3

1.7.3 Encoder and Print Width Problems

Important Notes:
1. Never assume that the entered print width value is correct; always go back to the calculations.
2. Never assume that the line speed is known accurately; try to measure it or estimate it as you see it on
the day. (Refer to the "Line Speeds per Product Frequency" section later in the manual).
The encoder will only maintain a fixed print width up to the lower of the maximum line speed and the
maximum encoder speed calculated in Step 3. When this speed is exceeded, the printed message length
can increase dramatically and unpredictably. The same effect can be seen if the print width value is
incorrectly calculated or entered. Very often a printer will be set up on line with a shaft encoder, the pitch
factor poorly calculated (if at all) and print samples taken.
Troubleshooting must follow a logical sequence:
1. If the message length measured on the print samples is larger than that calculated in Step3, then it is
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