Linx 7900 - Page 20

Page 11 of 25 FA69372–2 English
Jun 2013
25
How To Install and Set Up the 5900 &
7900 Printer
Linx 5900 & 7900
To calculate the required Raster Pitch
Use the formula:
where:
Printed length
= the
length of the printed message on the product. This length must
not be greater than the length of the area that is left clear for printing.
Number of Rasters in Message: Where all the characters in the font have the same
width, this value = Number of characters x Character width (rasters). If the
characters have different widths, you can use the Cursor Position value in the
Message Editor page to measure the printed length.
In this example, the length of the area that is available for the message is 50 mm and the
message contains 132 rasters. The calculation is as follows:
If the pitch is greater than this value, the message does not fit into the 50 mm print area.
The ideal raster pitch for the 16 Linear Quality Message Type and Ultima 62 µm is
0.353 mm (see the table on page 20). In this example, the space between the drops, in the
horizontal direction, is greater than the ideal raster pitch. This difference causes small
spaces between the drops.
NOTE: Before you purchase any components, consider other products that you plan to put
on the same line. Repeat the raster pitch calculations for other products as
necessary.
Step 2: Select the encoder, encoder wheel, and pitch factor
Each combination of encoder and encoder drive (gears or wheels) gives a different ‘encoder
pitch’. The encoder pitch is the distance that the product moves for each encoder output
pulse. The encoder pitch and the pitch factor (a whole number) are multiplied together to
give the actual raster pitch. This value must be as close as possible to the required raster
pitch.
The table below gives the encoder pitch for standard Linx encoders and wheels.
To calculate the encoder pitch for other gearing or drives, use the following:
Required Raster Pitch (mm) =
Printed Length (mm)
Number of Rasters in Message
Required Raster Pitch (mm) =
50 mm
= 0.378 mm
132
Encoder Pitch =
Encoder wheel circumference
Encoder pulses per revolution