System for Detecting Offset Printing Using Same
AssigneesCentre National de la Recherche Scientifique (CNRS), Universite De Bordeaux 1
InventorsLaurent Sarger, Lionel Canioni, Stephane Santran, Edouard Girault
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Abstract
The invention concerns a detection system (7) for measuring at least one characteristic of an inked zone (5) comprising at least one sensor adapted to sense a light radiation reflected by said inked zone (5) and to generate a measurement signal representing at least the characteristic of the inked zone (5). Such a system further comprises at least one first optic fiber (10), adapted to convey up to the neighbourhood of the inked zone (5), a light radiation emitted by a light source (11).
Claims14
An assembly of a multiplicity of machines employed to perform a printing operation,
- where the said assembly has a single light source, with each machine including:
- a printing device that creates at least one inked zone (5) on a printing substrate, by means of at least one printing ink,
- a feedback loop (6) to perform the regulation of at least one characteristic of an inked zone (5), where the said feedback loop includes:
- at least one control unit, to control at least one characteristic of the said printing ink, in accordance with a difference between at least one characteristic of a control inked zone (5) and at least one characteristic of a measured inked zone (5);
- at least one detection system (7) to measure at least one characteristic of an inked zone (5), where the detection system (7) includes:
- at least one sensor designed to capture light radiation reflected by the said inked zone (5), and to generate a signal representing at least the characteristic of the inked zone (5), and
- at least one first optical fibre (10), designed to convey, to the vicinity of the inked zone (5), light radiation emitted by the said single light source.
An assembly of machines according any of the previous claims, in which the measured signal representing the characteristic of the inked zone includes a signal representing the brightness of the inked zone (5), where the detection system has at least one second optical fibre (12) designed to convey from the vicinity of the inked zone (5), light radiation reflected by the inked zone (5).
An assembly of machines according to any of the previous claims, in which the sensor also includes at least one camera (12a) and in which the signal representing the brightness is a signal representing the spatial extension and/or the intensity of the reflected light radiation.
Dependencies are inferred from the claim text.