SYSTEM OVERVIEW
77091 Issue 2 November 2003 19
The printer is fixed to the side of a conveyor
along which move the items to be printed.
As an item reaches the print head it is
detected by a built-in photocell mounted just
above the nozzle plate. (The diagram left
shows a C16 print head. The arrangement is
slightly different for some printers, but the
principle remains the same.)
The system then allows a short time delay to enable the item to be carried on past
the print head. This delay depends on the speed of the conveyor and the length
and position of the message and is set by the operator for each message.
When the item is at the correct position in respect to the print head, the desired
text is printed by repeated triggering of the solenoid valves.
Meanwhile a second item may be approaching the print head. Items do not need
to be equally spaced along the conveyor since the printer senses each one
individually as it reaches the photocell.
Photocell
Direction of Travel
Photocell
Direction of Travel
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