EC-PACK EC-JET 2000, Manual

Page: 97 / 107

User Manual The1.1 version of 2018 Guangzhou EC-PACK CO.LTD
97
The character width varies with the size of character chosen. The figures in the table include the
gaps between characters; this will introduce a small error as the gap after the last character is not
printed.
For example: Consider printing “Sell By 19 Nov 0000” in 7 High Full using a Midi print head and
the 7 GEN STD raster onto a print area 38mm long.
From the table above, the width of each character is 6 rasters. The message is 17 characters long
including spaces. Therefore, the required raster pitch is given by:
Required raster pitch
（
mm
）
= 38mm = 0.373mm
17 Character×6 Raster
This will be the maximum pitch possible; any larger and the message will not fit in the print target
area (38mm).
Note: the ideal drop pitch for the 60 micron printhead of EC-JET is 0.4mm. If the actual
drop pitch is bigger than 0.4mm, the raster distance will be wider, the line speed will
increase.
Step 2: Select the Encoder, Gearing, and Pitch Factor
A particular combination of encoder and encoder drive (gearing or wheel) will give a particular
encoder pitch; that is, the distance the product will travel for each cycle of the encoder output
signal. The encoder pitch will be multiplied by the pitch factor (a whole number) to give the actual
raster pitch. This should be as close as possible to the required raster pitch.
The table below gives the encoder pitches for standard EC-JET encoders and wheels. The encoder
pitch for other gearing or drives can be calculated using:
Encoder Pitch
（
mm
）
= Wheel Circumference
（
mm
）
Encoder Pulses Per Revolution
Where: