76
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76 User Manual
Appendix 1:Installations & Setting Up
Character Set
Character Width
EJ112
5 HighCaps
7 HighFull
7 Chinese
9 HighCaps
12 HighCaps
12 Chinese
16 HighFull
16 HighCaps
16 Chinese
24 HighCaps
24 Chinese
6
6
-
-
10
13
11
11
17
14
25
The screened conductor should be connected to the shell of the D - Type connector and to the printer
chassis at the printer end of the cable (it must not be connected to 0 volts).
CAUTION:
EMC performance may be compromised by the use of unsuitable shaft encoders. Use
only EC-JET approved accessories.
Selecting the Encoder, Gearing, and Print Width
When using a shaft encoder it is vitally important that the calculations are followed and the print width
is computed based on the geometry of the set up. If guessed at, messages will not be printed at the
required size; rasters will be printed too close together or too far apart.
The calculations take you through a series of steps as shown below. There is also a worked example
and a problem solving section afterwards.
Step 1
Define the required raster pitch for the application.
Step 2
Select the encoder, gearing and pitch factor that gives an actual raster pitch close to that
required.
Step 3
Check that the calculated print performance (size and speed) is adequate.
Step 4
Calculate the print width from the pitch factor and enter it.
Step 5
Check print samples for performance.
Step 1:
Define the Required Raster Pitch for the Application
For each raster type on each printhead type there is a drop pitch which gives the best quality print, i.
e. 1:1 aspect ratio at the default printer settings. This value is known as the ideal pitch; a table later in
the section lists them. For a particular application you may want to chose a different pitch, bearing in
mind that the aspect ratio can be adjusted using the Print Height setting (see “Changing the System
Setup”).
The required raster pitch is calculated by:
Required raster pitch (mm)
Printed Length (mm)
Number of Characters x Character Width (rasters)
Printed Length (mm)
Number of Rasters in Message
Where:
Printed length = length of message on product. This must be less than the length of any area left clear
for printing.
Number of characters = number of characters in the longest line of the message.
Character width = number of rasters in each character; see the following table.
(Alternatively, obtain the number of rasters in the message by creating the message on the printer and
noting the x-position of the cursor just after the end of the message.)
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.
