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Unformatted text preview: sto Didactic GmbH & Co. KG • FP 1110 15. Special designs and variants of proximity sensors 15.2.5 Printing mark sensors
Printing mark sensors are used for the detection of printed contrast markings, e.g. of
printed black-white or coloured marks on packaging materials, identification codes
on storage containers. Other examples include positioning with printing, for
applying glue or for cutting material widths according to patterns, or for cutting
labels or bags.
Printing mark sensors are also described as marking readers/scanners.
Printing mark sensors operate similarly to diffuse sensors, except for one difference
in that the emitting beam is focussed on a specific sensing distance. Printing mark
sensors are able to detect very slight contrast differences, whereby differences in
colour can also be interpreted as contrast differences.
The object must be within certain tolerances of the switching distance of the
proximity sensor. The strength of radiation reflected by the object is compared in...
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This note was uploaded on 11/01/2012 for the course CHEMICAL 102 taught by Professor Jamesrodriguez during the Spring '12 term at Universidad Politécnica de Cartagena.
- Spring '12