Fuji Xerox Co., Ltd.

Kabushiki Kaisha Toshiba

Fujifilm Business Innovation Corp.

Naoki Ota

Katsuyuki Kitajima

Yasuhisa Morooka

Masataka Kuribayashi

Yusuke Fukuda

Tatsuhiro Igarashi

Takafumi Koide

Makoto Kamisaki

Teppei Yawada

Jun Sekiya

Shota Oshima

Nagahito Ichijo

Manabu Furuki

Yuma Kubo

Nobuyuki Hirose

An image forming apparatus includes: an electrophotographic photoreceptor; a charging device that charges a surface of the electrophotographic photoreceptor; an electrostatic charge image-forming device that forms an electrostatic charge image on the charged surface of the electrophotographic photoreceptor; a developing device that stores a developer containing a toner, and supplies the developer to develop the electrostatic charge image on the surface of the electrophotographic photoreceptor into a toner image, wherein the developing device has: a first developing member that is disposed to face the electrophotographic photoreceptor, holds the developer, and transports the developer to a development region; a second developing member that is disposed downstream of the first developing member in a rotation direction of the electrophotographic photoreceptor so as to face the electrophotographic photoreceptor, holds the developer, and transports the developer to a development region; a first power source that applies, to the first developing member, a developing voltage obtained by superimposing an AC voltage on a DC voltage; and a second power source that applies, to the second developing member, a developing voltage obtained by superimposing an AC voltage on a DC voltage; a transfer device that transfers the toner image on the surface of the electrophotographic photoreceptor to a surface of a recording medium; a fixing device that fixes the toner image to the surface of the recording medium; and a control device that acquires image information regarding the toner image, and controls at least one of the first power source and the second power source according to the image information such that the AC voltage of the developing voltage applied to the second developing member has a lower frequency than the AC voltage of the developing voltage applied to the first developing member.

Image forming apparatus

A conveying device includes a conveying member that conveys a spray-receiving medium to be sprayed with pressure sensitive adhesive particles having a pressure-induced phase transition property, containing at least a binder resin, and having a sulfur content of 0.1 mass % or more and 0.5 mass % or less relative to an entirety of the pressure sensitive adhesive particles as measured by X-ray fluorescence; and a removing member that contacts the conveying member and removes the pressure sensitive adhesive particles remaining on the conveying member.

Conveying device and image forming apparatus

A particle conveying device includes a storage portion that stores pressure sensitive adhesive particles that contain at least a binder resin, have a pressure-induced phase transition property, and have a sulfur content in a range of 0.1 mass % or more and 0.5 mass % or less relative to the entire pressure sensitive adhesive particles as measured by X-ray fluorescence; and a conveying member that is disposed in the storage portion and rotates about a shaft that extends in one direction inside the storage portion to thereby convey the pressure sensitive adhesive particles in a direction along the shaft inside the storage portion.

Particle conveying device and image forming apparatus

An image forming apparatus includes an image holding member, a charging unit, an electrostatic image forming unit, a developing unit that includes an electrostatic image developer and develops the electrostatic image with the electrostatic image developer, a transfer unit, a fixing unit, a replenishment toner container that includes a replenishment toner that is to be supplied into the developing unit and discharges the replenishment toner by rotation of the replenishment toner container, a replenishment toner container mounting unit that holds the replenishment toner container and rotates the replenishment toner container, and a toner supply pass that connects the replenishment toner container mounting unit to the developing unit. The replenishment toner includes toner particles and silica particles having a number average particle size of 110 nm to 130 nm, a large-diameter-side number particle size distribution index (upper GSDp) of less than 1.080, and an average circularity of 0.94 to 0.98, wherein 80 number % or more of the silica particles have a circularity of 0.92 or more.

Image forming apparatus and toner cartridge

An image forming apparatus includes an image holding member, a charging unit that charges a surface of the image holding member, an electrostatic charge image forming unit that forms an electrostatic charge image on the charged surface of the image holding member, a developing unit that includes an electrostatic charge image developing toner and that develops the electrostatic charge image on the surface of the image holding member with the electrostatic chare image developing toner to form a toner image, an intermediate transfer body having a circumferential surface of which micro rubber hardness is in a range of 45 to 65, a first transfer unit that first transfers the toner image formed on the surface of the image holding member to a surface of the intermediate transfer body, and a second transfer unit that second transfers the toner image transferred to the surface of the intermediate transfer body to a recording medium, wherein the electrostatic charge image developing toner satisfies the following formulae(ln &#x3b7;(1)&#x2212;ln &#x3b7;(2))/(1&#x2212;2)&#x2264;&#x2212;0.14,(ln &#x3b7;(2)&#x2212;ln &#x3b7;(3))/(2&#x2212;3)&#x2265;&#x2212;0.15, and(ln &#x3b7;(1)&#x2212;ln &#x3b7;(2))/(1&#x2212;2)&#x3c;(ln &#x3b7;(2)&#x2212;ln &#x3b7;(3))/(2&#x2212;3)wherein &#x3b7;(T1) represents a viscosity of the electrostatic charge image developing toner at 60&#xb0; C., &#x3b7;(T2) represents a viscosity of the electrostatic charge image developing toner at 90&#xb0; C., and &#x3b7;(T3) represents a viscosity of the electrostatic charge image developing toner at 130&#xb0; C.

Image forming apparatus and toner with temperature-viscosity relationship

An image forming apparatus includes an image holding member, a charging unit that charges the surface of the image holding member, an electrostatic charge image forming unit that forms an electrostatic charge image on the charged surface of the image holding member, a developing unit that includes a developer containing toner particles containing a release agent having a melting temperature ranging from 60&#xb0; C. to 100&#xb0; C. and that develops the electrostatic charge image on the surface of the image holding member with the developer to form a toner image, a transferring unit that transfers the toner image formed on the surface of the image holding member to the surface of a recording medium, and a fixing unit that fixes the toner image transferred to the surface of the recording medium, wherein the fixing unit includes an endless member to be heated, the endless member contacts with the toner image transferred to the surface of the recording medium; a pressure member that presses the endless member to form a nipping region between the pressure member and the endless member; a first heater that is in contact with the inner surface of the endless member in the nipping region to heat the endless member; a second heater that is disposed in contact with the endless member and downstream of the first heater in the operational direction of the endless member to heat the endless member; and a collection member that is disposed in the vicinity of the second heater so as to face the outer surface of the endless member and that collects particles.

An image forming apparatus includes: an image holding member; a charging unit that charges a surface of the image holding member; an electrostatic image forming unit that forms an electrostatic image on the charged surface of the image holding member; a developing unit that houses an electrostatic image developer including a toner containing an external additive and develops the electrostatic image formed on the surface of the image holding member with the electrostatic image developer to thereby form a toner image; a transfer unit that transfers the toner image formed on the surface of the image holding member onto a surface of a recording medium directly or through an intermediate transfer body; and a fixing unit that fixes the toner image transferred onto the surface of the recording medium. The transfer unit includes a contact portion-forming member that comes into contact with the image holding member or the intermediate transfer body to form a contact portion and a transfer bias application unit that applies a transfer bias including a superimposed voltage to the contact portion. The superimposed voltage has two peak values and is composed of an AC voltage and a DC voltage. The AC voltage has a duty ratio D of less than 50% on a peak value side opposite to a peak value that causes the toner in the contact portion to move from the image holding member or the intermediate transfer body toward the contact portion-forming member. The DC voltage causes the electric potential of the contact portion-forming member to be shifted to the side opposite to the charge polarity of the toner such that the absolute value of the electric potential of the contact portion-forming member is larger than the absolute value of the electric potential of the image holding member or the intermediate transfer body. The toner satisfies the following formulas:(ln &#x3b7;(1)&#x2212;ln &#x3b7;(2))/(1&#x2212;2)&#x2264;&#x2212;0.14;(ln &#x3b7;(2)&#x2212;ln &#x3b7;(3))/(2&#x2212;3)&#x2265;&#x2212;0.15; and(ln &#x3b7;(1)&#x2212;ln &#x3b7;(2))/(1&#x2212;2)&#x3c;(ln &#x3b7;(2)&#x2212;ln &#x3b7;(3))/(2&#x2212;3),

Image forming apparatus including an electrostatic image developer including a toner

An image forming apparatus includes an image holding member, a charging unit that charges a surface of the image holding member, an electrostatic charge image forming unit that forms an electrostatic charge image on the charged surface of the image holding member, a developing unit that includes an electrostatic charge image developing toner and that develops the electrostatic charge image on the surface of the image holding member with the electrostatic chare image developing toner to form a toner image, an intermediate transfer body that has a circumferential surface having a plurality of grooves and an average in-plane roughness ranging from 10 nm to 30 nm, a first transfer unit that first transfers the toner image formed on the surface of the image holding member to a surface of the intermediate transfer body, and a second transfer unit that second transfers the toner image transferred to the surface of the intermediate transfer body to a recording medium, wherein the electrostatic charge image developing toner satisfies the following formulae(ln &#x3b7;(1)&#x2212;ln &#x3b7;(2))/(1&#x2212;2)&#x2264;&#x2212;0.14,(ln &#x3b7;(2)&#x2212;ln &#x3b7;(3))/(2&#x2212;3)&#x2265;&#x2212;0.15, and(ln &#x3b7;(1)&#x2212;ln &#x3b7;(2))/(1&#x2212;2)&#x3c;(ln &#x3b7;(2)&#x2212;ln &#x3b7;(3))/(2&#x2212;3),wherein &#x3b7;(T1) represents a viscosity of the electrostatic charge image developing toner at 60&#xb0; C., &#x3b7;(T2) represents a viscosity of the electrostatic charge image developing toner at 90&#xb0; C., and &#x3b7;(T3) represents a viscosity of the electrostatic charge image developing toner at 130&#xb0; C.

Electrophotographic image forming apparatus

An image forming apparatus includes an image carrier that includes a conductive substrate, and a photosensitive layer and a surface protection layer; a developing device that includes an electrostatic image developer containing a toner, and develops the electrostatic image to form a toner image. The toner contains an amorphous polyester resin and has a weight average molecular weight Mw in a range of from 25,000 to 60,000, and a ratio of the weight average molecular weight Mw to a number average molecular weight Mn (Mw/Mn) is in a range of from 5 to 10. In the toner, a ratio of an absorbance for a wavelength of 1500 cmto an absorbance for a wavelength of 720 cmis 0.6 or less, and a ratio of an absorbance for a wavelength of 820 cmto the absorbance for a wavelength of 720 cmis 0.4 or less.

An image forming apparatus includes an image holding member; a charging unit; an electrostatic image forming unit; a developing unit; a transfer unit; and a fixing unit that fixes the toner image on the recording medium. The toner has an amorphous polyester resin and has a weight-average molecular weight Mw in a range of 25,000 to 60,000, a ratio Mw/Mn is within a range of 5 to 10, a ratio of an absorbance at a wavenumber of 1500 cmto an absorbance at a wavenumber of 720 cmis 0.6 or less, and a ratio of an absorbance at a wavenumber of 820 cmto the absorbance at a wavenumber of 720 cmis 0.4 or less. The fixing unit includes a heat roll having an elastic component, an endless belt and a pressure pad that is disposed on an inner side of the endless belt.

An image forming apparatus includes an image holding member, a charging device, an electrostatic charge image forming device, a developing device having a toner, a transfer device, and a fixing device, wherein the fixing device includes a fixing belt, a rotational member, and a heater; the toner contains an amorphous polyester resin as a binder resin; and the toner has a weight average molecular weight Mw and a number average molecular weight Mn, Mw is from 25000 to 60000, and Mw/Mn is from 5 to 10, and has an infrared absorption spectrometry, the ratio of absorbance for a wavelength of 1500 cmto absorbance for a wavelength of 720 cmis 0.6 or less, and the ratio of absorbance for a wavelength of 820 cmto absorbance for a wavelength of 720 cmis 0.4 or less.

An image forming apparatus includes an image forming unit including an image carrier, a developing device that includes a developer containing a toner, and a cleaning device including a blade; and a transfer device. The toner contains toner particles having a volume-average particle size of 3 &#x3bc;m or more and 5 &#x3bc;m or less, a spherical inorganic external additive having a number-average particle size of 80 nm to 200 nm, and an organic component. In the cleaning device, an external additive residue in or near a contact region between the image carrier and the blade contains the organic component and an inorganic component, the area ratio of the organic component to the inorganic component is 3/7 or more and 7/3 or less, and the area ratio of the inorganic component that is spherical to the external additive residue is 30% or more.

An image forming apparatus includes a fixing unit that includes a heating and pressurizing member, and fixes the toner image by performing the operation of heating and pressurizing on the toner image on a recording medium twice or more times with the heating and pressurizing member, wherein the toner contains a toner particle which contains a binder resin containing a crystalline polyester resin, a colorant, and a release agent, and an external additive, and satisfies Expression: 2&#x2264;tan &#x3b4;&#x2264;2.5, wherein tan &#x3b4;represents a maximum value of a mechanical loss tangent existing in a range where a complex elastic modulus is from 1&#xd7;10Pa to 1&#xd7;10Pa, which is measured at an angular frequency of 6.28 rad/sec and a distortion amount of 0.3%.

An image forming apparatus includes an electrophotographic photoreceptor having an overcoat layer and a cleaning unit that includes a cleaning blade, a tip of which contacts with the electrophotographic photoreceptor, wherein the toner contains a toner particle which contains a binder resin containing a crystalline polyester resin, a colorant and a release agent, and an external additive, and the toner satisfies the following Expression: 2&#x2264;tan &#x3b4;&#x2264;2.5, wherein tan &#x3b4;represents a maximum value of a mechanical loss tangent existing in a range where a complex elastic modulus is from 1&#xd7;10Pa to 1&#xd7;10Pa, which is measured at an angular frequency of 6.28 rad/sec and a strain amount of 0.3%.

An image forming apparatus includes a guide unit that guides at least one of an image holding member and an intermediate transfer member to a primary transfer position provided by a primary transfer unit such that a portion of the surface of the image holding member and a portion of the surface of the intermediate transfer member are disposed along with each other, wherein a toner contains a toner particle which contains a binder resin containing a crystalline polyester resin, a coloring agent and a releasing agent, and an external additive, and satisfies Expression: 2&#x2264;tan &#x3b4;&#x2264;2.5, wherein tan &#x3b4;represents a maximum value of a mechanical loss tangent existing in a range where a complex elastic modulus is from 1&#xd7;10Pa to 1&#xd7;10Pa, which is measured at an angular frequency of 6.28 rad/sec and a strain amount of 0.3%.

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Kanagawa, Japan

Naoki Ota