Ryobi Limited

Hideki Ikeda

Hiroshi Sugimoto

Yukio Ejiri

Katsushi Hirokawa

Takashi Kimura

Masaki Shiki

Tsuyoshi Inui

There are provided a printing method for a printing press that includes: printing an image on a sheet of paper fed using an ultraviolet curable paint; and irradiating the ultraviolet curable paint on the printed sheet fed by selectively causing a plurality of light emitting diodes disposed at predetermined intervals across a lateral direction of the sheet to turn on in accordance with the location and size of a predetermined area of the sheet, thereby irradiating the predetermined area with ultraviolet light therefrom and curing the predetermined area.

Printing method for printing press and printing press

An apparatus for controlling ink supply by varying the opening degree of an ink fountain key according to a measured density of a printed matter includes a control means for determining a reference correction value of the opening degree of the ink fountain key according to a density difference between a target density of the printed matter or a reference density and a measured density, and determining a correction value by multiplying the reference correction value by a coefficient having a value of more than 1. The control means controls the ink fountain key according to the correction value of the opening degree of the ink fountain key until the number of sheets printed from the start of the printing exceeds a predetermined number, and controls the ink fountain key according to the reference correction value after the number of sheets printed exceeds the predetermined number.

Ink fountain key adjuster using correction values based on printing conditions and sheet block size

Prior to printing work, the operator of the printing machine selectively inputs a kind of the printing paper (such as one of coated paper, mat-coated paper, and non-coated paper and so on) through a paper-type input portion A CPU controls the supply of ink according to the type of printing paper to be used as a result of controlling one of the operation of ink fountain keys, an ink fountain roller, and an ink ductor roller using an ink fountain key controller an ink fountain roller controller and an ink ductor roller controller

Ink supply control device for printing machines and a method therefor

Solid-patches and each printed with color-inks of cyan, magenta, yellow, and a gray patch included in a color bar are printed on a printed-matter A measuring and calculation device measures actual ink densities at each of the solid-patches and gray patches in the color bars and obtains differential values between the actual ink densities and target ink densities at the gray patch Then, both the amount of the primary-color-component and that of the color-impurity-component at the solid patches and are respectively substituted into equations at every detection of the differential values and that of the gray patches. In this way, ink supply volume is adjusted as a result of converting the differential values into primary-color-component differential amount in each of the color-inks.

Growing community of inventors

Fuchu, Japan

Hideki Ikeda