Fuji Xerox Co., Ltd.

Fujifilm Business Innovation Corp.

Shota Oshima

Masataka Kuribayashi

Katsuyuki Kitajima

Takafumi Koide

Teppei Yawada

Yusuke Fukuda

Makoto Kamisaki

Yasuhisa Morooka

Naoki Ota

Tatsuhiro Igarashi

Jun Sekiya

Yuma Kubo

Daisuke Tano

Masahiro Uchida

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 cleaning blade includes a contact part coming into contact with a member to be cleaned, the contact part being constituted by a member containing polyurethane rubber produced by polymerizing at least a polyol component and a polyisocyanate component. The ratio (M100/Re) of 100% modulus (M100 [MPa]) to rebound resilience coefficient (Re [%]) of the member is 0.25 or more. The rebound resilience coefficient (Re [%]) of the member is less than 25%. The tensile stress at 23&#xb0; C. and 200% strain of the member is 15 MPa or more.

Cleaning blade, cleaning device, process cartridge, and 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: a developing section that forms a toner image by developing an electrostatic latent image using toner. The toner satisfies the following relations: (ln&#x3b7;(T1)&#x2212;ln&#x3b7;(T2))/(T1&#x2212;T2)&#x2264;&#x2212;0.14; (ln&#x3b7;(T2)&#x2212;ln&#x3b7;(T3))/(T2&#x2212;T3)&#x2265;&#x2212;0.15; and (ln&#x3b7;(T1)&#x2212;ln&#x3b7;(T2))/(T1&#x2212;T2)&#x3c;(ln&#x3b7;(T2)&#x2212;ln&#x3b7;(T3))/(T2&#x2212;T3), where &#x3b7;(T1) represents a viscosity of the toner at 60&#xb0; C., &#x3b7;(T2) represents a viscosity of the toner at 90&#xb0; C., and &#x3b7;(T3) represents a viscosity of the toner at 130&#xb0; C.).

Image forming apparatus and process cartridge including a toner satisfying relations

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 that includes a toner; a transfer unit; and a fixing unit that fixes the toner image transferred on the surface of the recording medium to the recording medium. The fixing unit includes a fixing belt arranged to contact with the toner image transferred on the surface of the recording medium, a rotatable body arranged to be in contact with an outer peripheral surface of the fixing belt so as to form a contact region between the rotatable body and the fixing belt, the rotatable body transporting the recording medium in the contact region by rotating together with the fixing belt, and a heat source that heats the contact region formed between the fixing belt and the rotatable body. The 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 including a fixing belt for fixing toner including toner particles and silica particles

An image forming apparatus includes an image carrier; a charging section that charges a surface of the image carrier; an electrostatic charge image forming section that forms an electrostatic charge image on the charged surface of the image carrier; a developing section that has a container containing an electrostatic charge image developer and develops the electrostatic charge image formed on the surface of the image carrier into a toner image using the electrostatic charge image developer, the electrostatic charge image developer including toner for electrostatic charge image development, the toner containing toner particles and an external additive; a transfer section that transfers the toner image formed on the surface of the image carrier to a surface of a recording medium; a cleaning section that has a cleaning blade with which the cleaning section cleans the surface of the image carrier; and a lubricant supplying section that has a lubricant supplying member that supplies a lubricant to the contact portion between the cleaning blade and the image carrier. The toner satisfies the following relations: (ln &#x3b7;(T1)&#x2212;ln &#x3b7;(T2))/(T1&#x2212;T2)&#x2264;&#x2212;0.14; (ln &#x3b7;(T2)&#x2212;ln &#x3b7;(T3))/(T2&#x2212;T3)&#x2265;&#x2212;0.15; and (ln &#x3b7;(T1)&#x2212;ln &#x3b7;(T2))/(T1&#x2212;T2)&#x3c;(ln &#x3b7;(T2)&#x2212;ln &#x3b7;(T3))/(T2&#x2212;T3), where &#x3b7;(T1) represents a viscosity of the toner at 60&#xb0; C., &#x3b7;(T2) represents a viscosity of the toner at 90&#xb0; C., and &#x3b7;(T3) represents a viscosity of the toner at 130&#xb0; C.

Image forming apparatus and process cartridge

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 the surface of the image holding member, an electrostatic latent image forming unit that forms an electrostatic latent image on the charged surface of the image holding member, a developing unit that develops the electrostatic latent image to form a toner image, a transferring unit that transfers the toner image to a first side of a recording medium, a fixing unit that allows the recording medium having the transferred toner image to pass through a nipping region to fix the toner image, a first charging unit that faces the first side of the recording medium and that charges particles, and a second charging unit that charges a second side of the recording medium to the opposite polarity to the charged particles after the recording medium passes through the nipping region.

Electrophotographic image forming apparatus

An image forming apparatus includes an image holding member, a charging unit that charges the surface of the image holding member, an electrostatic latent image forming unit that forms an electrostatic latent 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 latent 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 to a recording medium, a fixing unit that includes two members of which the outer surfaces are in contact with each other to form a nipping region and of which at least one member is a belt member and that allows the recording medium having the transferred toner image to pass through the nipping region to fix the toner image to the recording medium, a particle charging unit that is disposed in the vicinity of the nipping region and upstream of the nipping region in the transport direction of the recording medium so as to face the toner-image-formed side of the recording medium and that charges particles, and a particle collecting unit that is disposed near the particle charging unit and that is charged to the opposite polarity to the charged particles.

An image forming apparatus includes an image holding member, a developing device, and a supplying device including a storage unit and a transport unit, wherein the storage unit stores toner and includes a bag having a flexible material, the transport unit uses suction pressure to transport the toner from the storage unit and supplies to the developing device, the toner contains an amorphous polyester resin, toner particles of the toner have a weight average molecular weight Mw and a number average molecular weight Mn, the weight average molecular weight Mw is in a range of 25,000 to 60,000, a ratio Mw/Mn is in a range the range of 5 to 10, a ratio (P2/P1) of a peak height of an absorption peak of the toner particles at a wavenumber of 820 cm(P2) to a peak height of the absorption peak at a wavenumber of 720 cm(P1) is 0.4 or less, and a ratio (P3/P1) of a peak height of the absorption peak of the toner particles at a wavenumber of 1500 cm(P3) to the peak height of the absorption peak at the wavenumber of 720 cm(P1) is 0.6 or less.

Image forming apparatus comprising a supplying device including a storage and a transport unit

An image forming apparatus includes an image holding member, a charging device that charges a surface of the image holding member, an electrostatic charge image forming device that forms an electrostatic charge image on the charged surface of the image holding member, a developing device that has an electrostatic charge image developer containing an electrostatic charge image developing toner and that develops the electrostatic charge image to form a toner image on the surface of the image holding member, and a transfer device that transfers the toner image onto a recording medium, wherein the transfer device includes a belt member and a transfer member, the belt member has an outer surface that contacts the image holding member, and the belt member is winding around the image holding member and the transfer member; and the toner has a binder resin containing an amorphous polyester resin.

An image forming apparatus includes an image holding member, a charging unit, an electrostatic charge image forming unit, a developing unit, a transfer unit, and a cleaning unit having a cleaning blade that is in contact with the surface of the image holding member to clean the surface of the image holding member, wherein in the cleaning device, a variation in a load applied by the cleaning blade to the image holding member in a slide test is 1.5 gf/mm or less, wherein in the slide test, an image holding member which has a diameter of 30 mm and with which the cleaning blade is in contact at a contact angle of 23&#xb0; and a pressing pressure of 4.0 gf/mm is rotated 100,000 times at a rotational speed of 175 mm/sec to slide the cleaning blade.

Growing community of inventors

Kanagawa, Japan

Shota Oshima