Riso Kagaku Corporation

Inashiki, Japan

Riso Kagaku Corporation

Inashiki, Japan
SEARCH FILTERS
Time filter
Source Type

Patent
Riso Kagaku Corporation | Date: 2017-01-04

A drive control device includes a processor and a memory including instructions that, when executed by the processor, cause the processor to perform operations. The operations include: comparing a rotation speed of a motor driven by a PWM control of a synchronous rectification type and a target value of the rotation speed and calculating an error speed; calculating a torque required in the motor based on the calculated error speed; calculating a drive voltage of the motor in the synchronous rectification type based on the calculated torque, the rotation speed of the motor, and an electrical specification of the motor; and setting a duty ratio of a PWM signal in the synchronous rectification type based on the calculated drive voltage.


Patent
Riso Kagaku Corporation | Date: 2017-02-01

An image scanning apparatus performs operations including: upon detection of a first angle, causing light to be emitted to an original and recording a distribution of reflected light of the emitted light as first read data; upon elapse of a predetermined time from detection of a second angle, causing light to be emitted to the original and recording a distribution of reflected light of the emitted light as second read data; detecting a closed state of a pressure plate based on the second read data; and upon determination of an angle of the pressure plate with respect to the platen being equal to or smaller than a third angle smaller than the second angle in the detection of the closed state, detecting a width of the original in an opening-closing direction of the pressure plate based on a difference between the first and second read data.


Patent
Riso Kagaku Corporation | Date: 2017-01-04

A drive control device includes: a driver including a circuit and configured to drive a motor; and a controller configured to control the driver. The controller is configured to: in a period other than a stop period during driving of the motor, control the driver by a PWM control of a synchronous rectification type, the stop period lasting for a specified time or longer during the driving of the motor; and in the stop period during the driving of the motor, suspend the PWM control of the synchronous rectification type and control the driver such that the motor is set to a short-circuit brake state or a disconnected state.


Patent
Riso Kagaku Corporation | Date: 2017-02-01

A controller drives a conveyer (37) 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 (27, 28) 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.


Patent
Riso Kagaku Corporation | Date: 2017-01-18

An inkjet ink is provided which preferably having a small particle size and excellent intermittent dischargeability. Moreover, the inkjet ink is provided which preferably improving the storage stability of the inkjet ink, and printing a printed item having excellent rub fastness. Specifically, an inkjet ink comprising colored resin particles, a basic dispersant and a non-aqueous solvent, wherein the colored resin particles comprise a pigment, a solid resin and a pigmentary synergist is provided.


Patent
Riso Kagaku Corporation | Date: 2017-03-29

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: 2017-01-18

A colored resin particle dispersion and an inkjet ink are provided which preferably exhibit excellent rub fastness and alcohol resistance, and yield printed items having high image density. Specifically, a colored resin particle dispersion comprising colored resin particles, a basic dispersant and a non-aqueous solvent, wherein the colored resin particles comprise a colorant, a thermoplastic solid resin and a liquid organic compound having an acidic group, and the thermoplastic solid resin has a polar parameter p and a hydrogen bonding parameter h from the Hansen solubility parameters that satisfy p = 2.5 to 11.0 and h = 5.0 to 12.0 respectively is provided.


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: 2017-04-05

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: 2017-09-20

A controller, upon remaining sheets existing in both a print conveyer (26) and a lower conveyer (43) and a sheet size of the sheets being equal to or larger than a specified size upon occurrence of a sheet jam: control an elevator (32) to maintain the print conveyer at a print position, determine to position the print conveyer at a lower limit position in response to removal of the remaining sheet from the lower conveyer, and then drive the elevator to move the print conveyer to the lower limit position; or drive the elevator to move the print conveyer to the lower limit position, determine to position the print conveyer at the print position in response to removal of the remaining sheet from the lower conveyer, and then drive the elevator to move the print conveyer to the print position.

Loading Riso Kagaku Corporation collaborators
Loading Riso Kagaku Corporation collaborators