Linx 7900 - Page 21

Page 12 of 25 FA69372–2 English
Jun 2013
25
How To Install and Set Up the 5900 &
7900 Printer
Linx 5900 & 7900
where:
Encoder wheel circumference = the distance that the product moves for one rotation
of the encoder. This value depends on the application. For example, the wheel
circumference can be 3.14 x roller diameter, or 3.14 x star-wheel diameter.
Figure 9. Encoder Pitch for standard Linx encoders and wheels
The encoder pitch is multiplied by a whole number (or pitch factor) to give the actual raster
pitch. Select an encoder and gearing to make the actual raster pitch close to the required
raster pitch.
Actual Raster Pitch (mm) = Encoder Pitch (mm) x Pitch Factor
where the Pitch Factor is a whole number.
Select a combination of an encoder and gearing, calculate the encoder pitch, then multiply
this value by whole numbers to get the actual raster pitch. Repeat this process until you get
a value that is close to the required raster pitch.
Figure 10. Calculate the Pitch Factor
For each encoder pitch that you try, use the following formula to find the starting point for
the pitch factor calculation:
* This value is calculated to the nearest whole number.
Pitch Factor* =
Required Pitch (mm)
Encoder Pitch (mm)
68542
Wheel Circumference/Encoder Pitch (mm)
Encoder p.p.r. Your Application 500 mm 333 mm 304.8 mm 200 mm 50 mm
2500 0.200 0.133 0.121 0.080 0.020
5000 0.100 0.066 0.060 0.040 0.010
10000 0.050 0.033 0.030 0.020 0.005
68574
Encoder/Gearing
Encoder Pitch x Pitch Factor = Actual Raster Pitch
Try 1
Try 2
Try 3