Inashiki, Japan
Inashiki, Japan

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Patent
Riso Kagaku Corporation | Date: 2016-09-20

An inkjet printer includes plural inkjet heads that are aligned in a head alignment direction to form a head row, a blower that blows air to the head row from one side along the head alignment direction, and an aspirator that is disposed on an extended line of the head row and on the other side along the head alignment direction for aspirating air through its aspirator port. The aspirator includes a tubular duct that extends from the aspirator port toward the head row.


Patent
Riso Kagaku Corporation | Date: 2016-09-20

An inkjet printer includes: a printing unit including an inkjet head and configured to eject an ink from the inkjet head while conveying a sheet in a conveying direction along a printing route to perform printing on the sheet; and a downstream side conveyor arranged downstream of the printing unit in the conveying direction and including a guide defining a downstream conveyance route being a space for the sheet to be conveyed. The downstream side conveyor is configured to convey the sheet along the downstream conveyance route. The downstream side conveyor includes an adjustment member narrowing a flow passage of air in the downstream conveyance route. The guide includes communication holes communicating the downstream conveyance route with a space outside the printing route and outside the downstream conveyance route.


Patent
Riso Kagaku Corporation | Date: 2016-08-18

There are provided: a maintenance unit that performs a maintenance operation simultaneously on the plurality of inkjet heads, a memory that stores, for each of ink types, a settable range of a maintenance cycle of a maintenance operation as maintenance information; and a controller that reads, from the maintenance information stored in the memory, lower limit values and upper limit values settable ranges) corresponding to table numbers stored in the memories of all the ink cartridges all the ink cartridges when a user maintenance cycle having been stored in the memory is set, and that causes the maintenance unit to perform a maintenance operation with the user-set maintenance cycle being the maintenance cycle when the user-set maintenance cycle is within the read-out settable ranges for all the ink types.


Patent
Riso Kagaku Corporation | Date: 2016-06-29

A controller drives a conveyer to start to convey a sheet of continuous paper and accelerates the sheet to a printing conveyance speed, and drives an inkjet head to start to perform a printing while driving the conveyer to convey the sheet at the printing conveyance speed. The controller drives a tension adjuster to adjust a tension of the sheet such that the tension of the sheet during acceleration after start of conveyance of the sheet is smaller than the tension of the sheet during the printing, and drives the head gap adjuster to adjust a head gap between the inkjet head and the sheet such that a first head gap during the acceleration of the sheet is greater than a second head gap during the printing.


An image processing apparatus performs operations including: when a density value of a black component in uncorrected monochrome image data corresponding to each of pure colors including primary colors and secondary colors in color image data is lower than a reference density value, the uncorrected monochrome image data being obtained by a monochrome conversion from the color image data to monochrome image data, determining a correction content for correcting the density value of the black component in the uncorrected monochrome image data corresponding to at least each of the pure colors out of the pure colors and peripheral colors of the pure colors in a color space to a value equal to or higher than the reference density value; and obtaining corrected monochrome image data in which correction based on the determined correction content is reflected in the uncorrected monochrome image data.


Patent
Riso Kagaku Corporation | Date: 2017-04-26

An image processing method comprising: converting an RGB input signal to a CMYK signal; converting the RGB input signal to a common color signal including lightness; generating a first Gray signal including a Gray value substituted for CMY values forming gray in the CMYK signal; generating a second Gray signal including a Gray value corresponding to a K value greater than a threshold in the CMYK signal; generating a Gray output signal in a CMYKGray output signal indicating color material amounts of cyan (C), magenta (M), yellow (Y), black (K), and gray (Gray) for printing by multiplying the generated first Gray signal and the generated second Gray signal respectively by coefficients corresponding to the lightness in the common color signal and then synthesizing the first Gray signal and the second Gray signal.


Patent
Riso Kagaku Corporation | Date: 2016-10-03

An image forming apparatus: upon determining that OR drawing of a first drawing object and a second drawing object included in received drawing data is not possible, drives one of a plurality of arithmetic processors to sequentially execute a first drawing process of the first drawing object and a second drawing process of the second drawing object in an original order of the first drawing object and the second drawing object in commands of the received drawing data; and, upon determining that the OR drawing is possible, distributes and assigns the first drawing process and the second drawing process to two or more of the plurality of arithmetic processors and drives the two or more arithmetic processors to execute the first drawing process and the second drawing process in parallel.


Patent
Riso Kagaku Corporation | Date: 2016-10-14

An image processing method comprising: converting an RGB input signal to a CMYK signal; converting the RGB input signal to a common color signal including lightness; generating a first Gray signal including a Gray value substituted for CMY values forming gray in the CMYK signal; generating a second Gray signal including a Gray value corresponding to a K value greater than a threshold in the CMYK signal; generating a Gray output signal in a CMYKGray output signal indicating color material amounts of cyan (C), magenta (M), yellow (Y), black (K), and gray (Gray) for printing by multiplying the generated first Gray signal and the generated second Gray signal respectively by coefficients corresponding to the lightness in the common color signal and then synthesizing the first Gray signal and the second Gray signal.


Patent
Riso Kagaku Corporation | Date: 2017-01-10

An expendable supply includes a memory that stores a timing of a last warning after a recommended limit. A warning generator of a printer determines whether to generate a warning upon occurrence of certain operations. The warning generator generates a warning when the last warning generation time is not stored in the memory of the expendable supply upon detection by a printer detector, or upon the last warning generation included in a first time period is stored in the expendable supply memory at the detection by the detector and the first time period has elapsed at the detection by the detector. A warning is not generated upon the timing of the last warning generation included in the first time period is already stored in the expendable supply memory upon detection by the detector and the first time period having not elapsed at the detection by the detector.


Patent
Riso Kagaku Corporation | Date: 2017-05-31

An image reading apparatus (1) includes a light emitting element (101), a luminance calculating unit (12), a light amount setting unit (13), and a storing unit (14). The light amount setting unit (13), in each line period, causes the light emitting element (101) to emit a light with gradually changing a reference light amount from a reference light amount set as a default value from among a plurality of reference light amounts stored in the storing unit (14), identifies a reference light amount so that the luminance calculated by the luminance calculating unit (12) is within a predetermined range, sets the identified reference light amount as a default value for the next line period, and causes the storing unit (14) to store that reference light amount.

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