APPARATUS FOR DETECTING PRINTING PLATES AND A PRINTING PLATE MONITORING SYSTEM FOR A PRINTING PRESS
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United States of America Patent
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N/A
Issued Date -
Dec 16, 2010
app pub date -
Sep 8, 2008
filing date -
Oct 4, 2007
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Apparatus for detecting the presence of a partially loaded printing plate in individual printing plate mounting positions on a plate cylinder of a printing press is disclosed. The system includes a discrete vacuum circuit associated with each individual printing plate mounting position. Each vacuum circuit includes suction elements that are positionable spaced from the surface of a plate cylinder so that, when a leading edge of a printing plate has been received in a lock-up slot in a plate cylinder and the plate cylinder is rotated to partially wrap said printing plate around said plate cylinder, a trailing edge portion of a printing plate is deflected away from the surface of the plate cylinder, due to its resilience, against the suction elements. It is thereby possible to generate a negative pressure in the vacuum circuit closed by said trailing edge portion of the printing plate against the suction elements. The existence of a negative pressure can be used to indicate the presence or absence of a partially loaded printing plate in each of the printing plate mounting positions.
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