Printing – Planographic – Lithographic plate making – and processes of making or using...
Reexamination Certificate
2005-08-30
2005-08-30
Funk, Stephen R. (Department: 2854)
Printing
Planographic
Lithographic plate making, and processes of making or using...
C101S484000, C101S477000
Reexamination Certificate
active
06935237
ABSTRACT:
A plate-making system, in which a light-sensitive lithographic printing plate carrying an interleaf paper superimposed thereon and/or an original plate for making a dummy plate carrying an interleaf paper superimposed thereon are processed in a plate-setter provided with an automatic interleaf paper-removing mechanism and an automatic developing machine, is characterized in that it comprises a means for detecting the presence of any interleaf paper on the lithographic printing plate and/or the original plate or a means for discriminating the interleaf paper, the light-sensitive lithographic printing plate and the original plate. A plate-making method of the invention is characterized by irradiating the interleaf paper, the lithographic printing plate and the original plate for making a dummy plate with sensor light rays after they are passed through the automatic interleaf paper-removing mechanism and determining the intensity of the light to thus detect any interleaf paper possibly present on the plates or discriminate the interleaf paper, the light-sensitive lithographic printing plate and the original plate for making a dummy plate from one another. The plate-making method permits the reliable detection of the presence of interleaf papers on light-sensitive lithographic printing plates and/or original plates for dummy plates and the plate-making operations can thus stably be carried out using a plate-setter and an automatic developing machine.
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Database WPI Week 199919; Derwent Publications Ltd., London, GB; AN 1999-225577; XP 002290189.
Fuji Photo Film Co. , Ltd.
Funk Stephen R.
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