Abstract: Paper physical property detecting device includes a first detector that measures a sheet of paper (hereinafter, merely referred to as a paper) made to stop temporarily on a conveyance path and acquires a first value corresponding to a first physical property, a second detector that measures a paper while conveying the paper on the conveyance path and acquires a second value corresponding to a second physical property with regard to a physical property different from the first physical property; and a corrector that corrects the first value on a basis of the second value and creates post correction data.

Abstract: An image forming apparatus includes an image former that forms an image on a sheet of paper, a detector that detects a physical property of a sheet of paper, a receiver that receives paper identification information used in identification of a sheet of paper designated by a user, and a hardware processor. The hardware processor performs: first judgement of judging whether or not there is a correspondence between the paper identification information received by the receiver and a detection result by the detector, second judgement of judging whether or not there is a correspondence between a detection result by the detector of a first sheet of paper conveyed and a detection result by the detector of a second sheet of paper conveyed; and operation control of the image former based on a first judgement result in the first judgement and a second judgement result in the second judgement.

Abstract: A recording material determination device, includes: a conveyor that conveys recording materials along a conveyance path; a detector that is provided at a middle of the conveyance path, and detects a characteristic value of each of the recording materials in conveyance; and a hardware processor that controls driving of the conveyor, stops a first recording material among the recording materials at the detector, and does not stop a second recording material that is conveyed after the first recording material, wherein the hardware processor determines whether the second recording material changes with respect to the first recording material, based on a first characteristics detection result of the first recording material detected by the detector, and on a second characteristics detection result of the second recording material detected by the detector.

Abstract: Provided are an image forming system and a method for detecting glossiness capable of accurately detecting glossiness in various media having different conditions. The image forming system includes a sensor unit including a light source that irradiates a medium being conveyed with light and a gloss sensor that receives light emitted from the light source and specularly reflected on the medium and detects a diffusion distribution of light in the medium, and a detection condition setting unit that identifies a type of the medium being conveyed and sets a light amount of the light source and/or exposure time of the gloss sensor at the time of glossiness detection in accordance with the type of the medium. The image forming system further includes a glossiness detector that detects glossiness of the medium from a diffusion distribution of light detected by the gloss sensor under the detection condition set by the detection condition setting unit.

Abstract: Paper physical property detecting device includes a first detector that measures a sheet of paper (hereinafter, merely referred to as a paper) made to stop temporarily on a conveyance path and acquires a first value corresponding to a first physical property, a second detector that measures a paper while conveying the paper on the conveyance path and acquires a second value corresponding to a second physical property with regard to a physical property different from the first physical property; and a corrector that corrects the first value on a basis of the second value and creates post correction data.

Abstract: A physical property detecting device, includes: an insertion part that includes an insertion port through which a sheet is inserted and removed; a first physical property detector that detects a first physical property of the sheet in a non-nipping state; and a second physical property detector that nips the sheet and detects a second physical property of the sheet in a nipping state, wherein the first physical property detector and the second physical property detector are disposed at different positions in an insertion and removal direction of the sheet.

Abstract: To provide a sheet conveyance device capable of preventing degradation in quality of conveying a sheet and image quality even when a stiffness of the sheet is different between a sheet conveyance direction and a sheet width direction. A sheet conveyance device of an image forming apparatus includes an image forming part that conveys a sheet along a conveyance path; and a stiffness acquisition part that acquires a stiffness of the sheet in a first direction including a component in the sheet conveyance direction by bending the sheet in the first direction, and acquires a stiffness of the sheet in a second direction including a component in the sheet width direction orthogonal to the sheet conveyance direction by bending the sheet in the second direction.

Abstract: Provided are an image forming system and a method for detecting glossiness capable of accurately detecting glossiness in various media having different conditions. The image forming system includes a sensor unit including a light source that irradiates a medium being conveyed with light and a gloss sensor that receives light emitted from the light source and specularly reflected on the medium and detects a diffusion distribution of light in the medium, and a detection condition setting unit that identifies a type of the medium being conveyed and sets a light amount of the light source and/or exposure time of the gloss sensor at the time of glossiness detection in accordance with the type of the medium. The image forming system further includes a glossiness detector that detects glossiness of the medium from a diffusion distribution of light detected by the gloss sensor under the detection condition set by the detection condition setting unit.

Abstract: A glossiness inspection device includes an illumination device that emits irradiation light to a glossiness detection target and a light receiving device that receives reflected light of the irradiation light reflected by the glossiness detection target and outputs a light reception detection signal according to an amount of the received light. A dimmer of the device adjusts an amount of the irradiation light, and a detection signal adjuster of the device adjusts a gain for amplifying the light reception detection signal. An irradiation position controller of the device selectively irradiates a first gloss region and a second gloss region of a correction plate with the irradiation light. A hardware processor of the device adjusts at least one of the amount of the irradiation light, an offset of the detection signal adjuster, a characteristic straight line for calculating a glossiness, or a calculated glossiness.

Abstract: To provide a sheet conveyance device capable of preventing degradation in quality of conveying a sheet and image quality even when a stiffness of the sheet is different between a sheet conveyance direction and a sheet width direction. A sheet conveyance device of an image forming apparatus includes an image forming part that conveys a sheet along a conveyance path; and a stiffness acquisition part that acquires a stiffness of the sheet in a first direction including a component in the sheet conveyance direction by bending the sheet in the first direction, and acquires a stiffness of the sheet in a second direction including a component in the sheet width direction orthogonal to the sheet conveyance direction by bending the sheet in the second direction.

Abstract: An image forming apparatus includes an image former that forms an image on a sheet of paper, a detector that detects a physical property of a sheet of paper, a receiver that receives paper identification information used in identification of a sheet of paper designated by a user, and a hardware processor. The hardware processor performs: first judgement of judging whether or not there is a correspondence between the paper identification information received by the receiver and a detection result by the detector, second judgement of judging whether or not there is a correspondence between a detection result by the detector of a first sheet of paper conveyed and a detection result by the detector of a second sheet of paper conveyed; and operation control of the image former based on a first judgement result in the first judgement and a second judgement result in the second judgement.

Abstract: A parameter determination apparatus includes: a first hardware processor that acquires a value related to a plurality of types of sheet physical properties; a second hardware processor that specifies at least any of a sheet type or a basis weight based on an acquired value related to a sheet physical property; and a third hardware processor that specifies a parameter related to sheet processing without specifying at least any of the sheet type or the basis weight, based on an acquired value related to a sheet physical property.

Abstract: An image forming apparatus includes a sensor that acquires first and second data groups of paper characteristics by measuring a recording medium; a processor that determines a parameter for controlling at least one of image formation and conveyance of a recording medium on a conveyance path based on the first and second data groups acquired by the sensor; an image former that forms an image on a recording medium conveyed on the conveyance path based on the parameter. The processor compares the first and second paper characteristic data groups, the first paper characteristic data group has been measured at a first time period and the second paper characteristic data group has been measured at a second time period nearer to a present time than the first time period, and the processor controls the image formation based on a the comparison result.

Abstract: A measuring device, includes a physical property value detector and a push contact member that pushes to bring a sheet material in contact with the physical property value detector; and further includes a first processor that stops conveyance of the sheet material, pushes to bring the sheet material in contact with the physical property value detector, and detects a physical property value of the sheet material; a second processor that, after having detected the physical property value, cancels the pushing by the push contact member, separates the sheet material from the physical property value detector, and starts conveyance of the sheet material; and a physical property value specifier that specifies the physical property value on a basis of physical property values of a plurality of positions within a surface of the sheet material detected by executing the first processing and the second processing repeatedly.

Abstract: A glossiness inspection device includes: an illumination device that emits irradiation light; a light receiving device that receives reflected light of the irradiation light reflected by a glossiness detection target and outputs a light reception detection signal according to an amount of the received light; a correction plate that includes at least a first gloss region and a second gloss region; a dimmer that adjusts an amount of the irradiation light; a detection signal adjuster that adjusts a gain for amplifying the light reception detection signal; an irradiation position controller that selectively irradiates the first gloss region and the second gloss region with the irradiation light; and a hardware processor that adjusts at least one of the amount of the irradiation light, an offset of the detection signal adjuster, a characteristic straight line for calculating a glossiness, or a calculated glossiness.

Abstract: The present invention is directed to detect gloss of a toner image from which the influence of heat applied to a sheet by a fixing unit is eliminated. An image forming device according to an aspect of the invention includes: a gloss sensor irradiating a recording medium on which a toner image is formed and fixed with light, measuring reflectance of reflection light from the recording medium, and measuring gloss of the toner image on the basis of the reflectance; and a gloss correcting unit correcting the gloss of the toner image measured by the gloss sensor in a situation that the temperature of the toner image fixed on the recording medium is assumed to be higher than a predetermined threshold temperature or in the case where it is determined that the temperature of the toner image is higher than the predetermined threshold temperature.

Abstract: Provided is a recording medium detection device which prevents a recording medium from jamming. The device comprises: a first roller and a second roller which nip and transport a recording medium; a roller shaft which rotatably supports the second roller; a shaft support; and a displacement detector. The shaft support supports the roller shaft movably in the thickness direction of the recording medium. The displacement detector detects displacement of the second roller in the thickness direction. The shaft support further supports the second roller movably in the transportation direction of the recording medium through the roller shaft.

Abstract: Provided is a recording medium detection device which prevents the decline in productivity. The recording medium detection device comprises a first detecting section and a second detecting section. The first detecting section performs a first adjustment process and makes a detection of a recording medium being transported. The second detecting section is located more downstream than the first detecting section in the transportation direction of the recording medium, performs a second adjustment process which takes a longer time than the first adjustment process, and makes a detection of the recording medium being transported.

Abstract: A sheet distinction device includes a measurer, a housing, a shutter, a calibration plate, and a controller. The measurer emits light to a sheet, receives light reflected from the sheet, and acquires detection information for determining physical properties of the sheet. The housing houses the measurer and is provided with an opening through which the emitted light and the reflected light pass. The shutter switches between a closed state in which the opening is closed and an open state in which the opening is open. The calibration plate is provided on a surface of the shutter which is on an inner side in the closed state. In the closed state, the measurer emits light to a calibration plate and receives reflected light to acquire acquisition information. The controller calibrates the measurer based on the acquisition information.

Abstract: A sheet distinction device includes a slot, a detector, a presser, a measurer, a calculator, and an operation controller. A sheet is inserted into the slot. The detector detects that the sheet has reached a detection position of the slot. The presser moves the sheet in a direction perpendicular to an insertion direction of the sheet to press a surface of the sheet against a measurement surface of the measurer. The measurer measures physical properties of the sheet. The calculator calculates an information value indicating time taken to insert the sheet. The operation controller controls operation start time and operation speed of the presser in accordance with the information value calculated by the calculator.