APPENDIX A : INSTALLATION
27080 Issue 1 Sept 98 A--19
PRODUCT DETECTOR INSTALLATION
Detailsaregiven inPart10:Optionsofthe followingtypes ofdetector:
D Photocell Assembly Retroreflective
D Photocell Assembly Proximity
D Proximity Switch Assembly.
The printer providesa12V 100mA d.c. output for useby the photocell
or proximity switch, and a 12V NPN open--collector input for product
detection signals back from the detector. The detectors are attached to
a connector on the side of the printer cabinet.
Sometimes the mode of operation and position of the productdetector
may be unique to a particular application. Domino would be pleased
to assist with any problem.
Product Detector Positioning
The product detector should be fitted at a position where it can detect
the product before the product reaches the print head. The product
detectorproducesapulsewhiletheproductispassingit,andeitherthe
leading edge or the trailing edge of this pulse can be selected to
generate the Print Go signal (which triggers printing of the message).
Atimedelay,calledthePrintGodelay,isappliedtothePrintGosignal.
This delay enables the product to reach the exact position where
printing should occur.
Positioningtheprintedmessageontheproductis,therefore,controlled
by two adjustments:
(a) Position of the product detector. The detector should be as
close as possible to the print head, although this may depend
upon the availability of attachment points, etc. The closest
distances may also be affected by the minimum print delay
available with the print format in use (see pg. A--10).
(b) Adjustment of the Print Go delay through the printer control
panel.
The aim should be to position the product detector and select a pulse
edge which will result in the minimum Print Go delay. A highly
unsatisfactorycondition,normallytobeavoided,iswhereoneproduct
triggers printing on the next. This becomes increasingly possible at
highprint repetitionrates,suchas withsmall products passing athigh
speed.
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