PROCEDE POUR MESURER LA PRESSION D'IMPRESSION DANS UNE MACHINE IMPRIMANTE

A force or movement sensor is disposed on or proximate to an impression cylinder of a sheet-fed printing machine in order to sense the printing pressure. The sensor is sampled in synchronism with the rotation of the impression cylinder and the feeding of the sheets in order to detect a first pressur...

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Bibliographic Details
Main Author GERD STEINER, WINFRIED HARTUNG ET VALENTIN GENSHEIMER
Format Patent
LanguageFrench
Published 24.11.1989
Edition4
Subjects
LINING MACHINES
MEASURING
MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER,MECHANICAL EFFICIENCY, OR FLUID PRESSURE
PERFORMING OPERATIONS
PHYSICS
PRINTING
PRINTING MACHINES OR PRESSES
STAMPS
TESTING
TRANSPORTING
TYPEWRITERS
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Summary:A force or movement sensor is disposed on or proximate to an impression cylinder of a sheet-fed printing machine in order to sense the printing pressure. The sensor is sampled in synchronism with the rotation of the impression cylinder and the feeding of the sheets in order to detect a first pressure signal when pressure is applied to the fed sheets, and to detect a second pressure signal when the impression cylinder is relieved of the printing pressure. The differential value of the first and second pressure signals is displayed as an output or is evaluated by a pressure control system. As a result, static and quasi-static disturbances are suppressed. The mesurement is not affected by wear of the cylinder bearings or journals, variations in machine speed, and zero-point shift in the sensor and its associated electronics. These disturbances are further suppressed by averaging or accumulating samples over sample intervals and over a number of revolutions of the impression cylinder. Also, by proper synchronization of the sampling intervals with the feeding of sheets to the impression cylinder, the method can be used in a two-color rotary press for separately determining and independently controlling the pressures from the top and bottom ink transfer cylinders in response to a single sensor at the impression cylinder.
Bibliography:Application Number: FR19850009913