EC-PACK EC-JET 1000Pro, Руководство пользователя, Страница: 109 / 120

Guangzhou EC-PACK Packaging Equipment Co., Ltd.
EC-JET 1000Pro Continuous Inkjet Printer
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The encoder pitch will be multiplied by a whole number to give the actual raster pitch. By selecting a
suitable encoder and gearing, the actual raster pitch can be made close to the required raster pitch.
Actual Raster Pitch (mm) = Encoder Pitch (mm) x Pitch Factor
Where:
Pitch Factor is a whole number.
This will probably require trial and error.
For each encoder pitch you try, the starting point for the pitch factors can be:
Pitch Factor = Required Pitch (mm)
Encoder Pitch (mm)
rounded to the nearest whole number.
Using the example from Step 1, the required raster pitch is 0.373 mm. A standard EC-JET encoder
and wheel will be used to try to achieve this.
No
shaft/shaft wheel Encoder Pitch X pitch factor=Actual Raster Pitch
1 2500ppr/188.2mm 0.075mm 5 0.375
2 5000ppr/188.2mm 0.0375mm 10 0.375
3 10000ppr/188.2mm 0.0188mm 20 0.375
For this example, the actual pitch using EC-JET standard encoder wheel and the resulting
two encoder are close to the desired pitch, taking into account the higher pulse value, the
higher cost encoder, we will start with 5000PPR encoder with EC-JET standard encoder
wheel (diameter 60mm, perimeter 188.2mm) factor 10
(this is covered in later sections).
Step 3: Check the Expected Print Performance
Any difference between the required raster pitch and the actual raster pitch will influence the print
performance. There is also a limitation due to the frequency of the encoder signals. In particular, the
printed message length and the maximum line speed must be checked. If there are any problems with
these, the selection process must be repeated.
Printed Message Length (mm) = Number of Rasters x Actual Raster Pitch (mm)
Where:
Number of Rasters = as calculated in Step 1
Actual Raster Pitch = as calculated in Step 2.
Max. Line Speed (m/s) = Actual Raster Pitch (mm) x Raster Rate (kHz)
Where:
Actual Raster Pitch = as calculated in Step 2