US 2016/0288487 A1Published application

Ink supply method and ink supply device

AssigneeKomori Corporation

InventorMasahiro Hirano

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Abstract

Correction values (Δθ1-Δθn) according to image area ratios in ranges of a printing plate of a preceding print job corresponding to ink fountain keys (4-1-4-n) are obtained. Opening amounts (θ1b-θnb) of the ink fountain keys (4-1-4-n) corresponding to the image of the printing plate (7′) of a next print job are corrected by correction values (Δθ1-Δθn) to obtain corrected opening amounts (θ1b′-θnb′). In a state in which ink in an ink roller group (6) has been decreased by scraping and removing it by an ink scraper blade (15) and in a state in which the opening amounts of the ink fountain keys (4-1-4-n) have been set to the corrected opening amounts (θ1b′-θnb′), an ink film thickness distribution corresponding to the image of the printing plate of the next print job is formed on the ink roller group (6).

Claims15

Dependent claims

An ink supply method comprising the steps of:

decreasing ink in an ink roller group by scraping and removing the ink by an ink scraping member after an end of a print job including adjusting an amount of ink supplied from an ink fountain to an ink fountain roller by adjusting an opening amount of an ink fountain key and supplying the ink supplied to the ink fountain roller to a printing plate via the ink roller group by a feed operation of an ink ductor roller;
calculating the opening amount of the ink fountain key corresponding to an image of a printing plate of a next print job;
obtaining, as a correction value of the opening amount of the ink fountain key, a correction value according to an index value representing an ink supply amount corresponding to an image in an area of a printing plate of a preceding print job corresponding to the ink fountain key;
correcting the calculated opening amount of the ink fountain key corresponding to the image of the printing plate of the next print job with the obtained correction value of the opening amount of the ink fountain key;
setting the opening amount of the ink fountain key to the corrected opening amount;
and
forming, on the ink roller group, an ink film thickness distribution corresponding to the image of the printing plate of the next print job by performing the feed operation of the ink ductor roller a predetermined number of times in a state in which the ink in the ink roller group has been decreased and in a state in which the opening amount of the ink fountain key has been set to the corrected opening amount.

4 more elements

An ink supply device comprising:

an ink fountain key configured to adjust an amount of ink supplied from an ink fountain to an ink fountain roller;
an ink ductor roller configured to feed the ink supplied to the ink fountain roller;
an ink roller group configured to supply the ink fed by the ink ductor roller to a printing plate;
an ink decreasing processing unit configured to decrease the ink in the ink roller group by scraping and removing the ink by an ink scraping member after an end of a print job;
an ink fountain key opening amount calculation unit configured to calculate an opening amount of the ink fountain key corresponding to an image of a printing plate of a next print job;
an ink fountain key opening amount correction value calculation unit configured to obtain, as a correction value of the opening amount of the ink fountain key, a correction value according to an index value representing an ink supply amount corresponding to an image in an area of a printing plate of a preceding print job corresponding to the ink fountain key;
an ink fountain key opening amount correction unit configured to correct the calculated opening amount of the ink fountain key corresponding to the image of the printing plate of the next print job with the obtained correction value of the opening amount of the ink fountain key;
an ink fountain key opening amount setting unit configured to set the opening amount of the ink fountain key to the corrected opening amount;
and
an ink film thickness distribution formation processing unit configured to form, on the ink roller group, an ink film thickness distribution corresponding to the image of the printing plate of the next print job by performing the feed operation of the ink ductor roller a predetermined number of times in a state in which the ink in the ink roller group has been decreased and in a state in which the opening amount of the ink fountain key has been set to the corrected opening amount.

7 more elements

Dependencies are inferred from the claim text.