Thermocode 2 Printer manual Version 2.04 January 2011 17
17
Encoder Description
Incremental encoders are commonly used as feedback devices for motor controllers. They also serve as
operator interfaces and are sometimes called rotary pulse generators.
An incremental encoder is made up of 2 major parts: the internal disk and the sensor. The disk of an
incremental encoder is patterned with a single track of repeating identical lines near the outside edge of the
disk. The number of line pairs on the disk determines the encoder resolution.
Our standard encoder wheel has a circumference of 200mm and runs on the surface of the substrate.
Thermocode Series 2 requires 2400 pulses per revolution.
Since the resolution of the Printhead is 12 dots per mm, we also require 12 pulses per mm down the web.
Therefore one revolution of the encoding wheel is 200mm X 12, equals 2400 pulses.
Principles of an Incremental Encoder
The Open Date Equipment standard encoder assembly is fitted with a measuring wheel on the output shaft,
you will have to provide specific sprung loaded designed brackets to mount the unit on the parent machine.
(Open Date Equipment Ltd can supply standard mounting brackets. Contact your local supplier)
You must ensure that no slipping happens between the substrate and the measuring wheel, otherwise
printing quality, print registration or printer errors could occur.
If you need to fit an encoder inside a parent machine, not just running against the substrate I suggest you
contact Open Date Equipment Ltd for technical assistance.
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