Printing & Copying Industries
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 | | The printing and copying
industries have in large part embraced the electronic age from a history of
manual typesetting and transfer printing, from chemical photography in the case
of copying, to digital printing and photocopying or digital document scanning
and reproduction. | |
Machines operating in printing and copying often transfer a powder like
toner onto paper using electrostatically charged drums which is later fixed via
a heat process.
This powdered toner is moved within the machinery from its container to the
drum and thence onto paper. Levels of toner are critical to the operation of
the machine. Capacitive sensing is a very suitable low cost solution for toner
detection.
Paper is transferred around machines from storage trays to drums, perhaps
via more storage trays to second side print operations, again some detection of
paper presence is often needed and capacitive sensors can make a contribution
to this sensing requirement with the potential added value over optical
techniques which is that capacitive sensors can be used to for "double sheet
detection", to detect if more than one sheet is being conveyed where perhaps
only one was intended.
See also:
Applications -
Powder or granule level detection
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