WaxJet 6100, Service Reference Manual

Page: 14 / 131

Product
Detection
(Photocell)
Product detection devices are used to initiate print cycles and
properly locate printing on package. Photocells are more suitable
than mechanical devices (such as switches) because they are less
likely to produce “double pulses” per product. Photocells are usually
mounted directly onto the Printhead housing, however, they can be
mounted directly to the conveyor with its own bracketry. Photocells
must be mounted up line from the Printhead for accurate product
detection. Most photocell assemblies have some adjustment
capabilities for operation in various application designs.
Proximity
The proximity photocell senses its own emitted light reflected back
as an object passes by. The proximity photocell is supplied with all
systems and is effective for most applications.
Reflective
The Retro-Reflective Photocell consists of a sensor and a reflector
with the reflector mounted directly in front of the sensor so that
product passes between the two. When the beam is broken, the
photocell sends the product detect signal.
2-4 Application Design