Ink washing device for a printing machine
AssigneeSakurai Graphic Systems Corporation
InventorsFumio Matsuda, Isao Chonan, Hideo Kitagawa, Katsunori Furuta
Life of this patent
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Abstract
An ink washing device is disclosed, for use in a printing machine having a deposit roller with a variable luminance outer surface. The washing device includes a blade disposed adjacent to the deposit roller, for removing excess deposit of ink on the outer surface of the deposit roller, thus causing its luminance to vary. A luminance sensor detects changes in the luminance of the outer surface. The washing operation is interrupted or continued based on the detected luminance changes.
Claims13
An ink washing device, for performing a washing operation in a printing machine, the printing machine including a plurality of ink rollers for supplying ink to a cylinder plate, a deposit roller having an outer surface where excess ink from the ink rollers is deposited, said outer surface having a luminance that varies with the amount of the deposited ink, and a spraying device for spraying washing fluid on at least one ink roller to initiate a washing operation, the ink washing device comprising:
- scraping means, disposed adjacent to said deposit roller, for removing the deposited ink on said outer surface;
- and
- operating detection means for determining the completion of the washing operation, said operating detection means including a luminance detector means responsive to said luminance of said outer surface during removal of the deposited ink, said operating detection means indicating completion of the washing operation when a luminance signal from the luminance detector means exhibits substantially no change.
An ink washing device, for performing a washing operation in a printing machine, the printing machine including a plurality of ink rollers for supplying ink to a cylinder plate, a deposit roller having an outer surface where excess ink from the ink rollers is deposited, said outer surface having a luminance that varies with the amount of the deposited ink, and a spraying device including an air supply and a washing fluid supply for spraying washing fluid on at least one ink roller to initiate a washing operation, the ink washing device comprising:
- scraping means, disposed adjacent to said deposit roller, for removing the deposited ink on said outer surface;
- operating detection means for determining the completion of the washing operation, said operating detection means including a luminance detection means responsive to said luminance of said outer surface during removal of the deposited ink, said operating detection means indicating completion of the washing operation when a luminance signal from the luminance detector remains substantially constant for a predetermined period of time;
- a first solenoid valve means for selectively interrupting the air supply to the spraying device;
- and
- a second solenoid valve means for selectively interrupting the washing fluid supply to the spraying device.
A method for performing a washing operation in a printing machine, the method comprising the steps of:
- spraying washing fluid on at least one roller of the printing machine to initiate a washing operation;
- scraping excess ink deposited on an outer surface of a deposit roller, which causes the luminance of said outer surface to change;
- detecting changes in the luminance of said outer surface during said scraping, and generating a signal indicative of said changes;
- and
- determining the completion of the washing operation responsive to said signal remaining substantially constant.
Dependencies are inferred from the claim text.