Canon Kabushiki Kaisha

Yasushi Katsuta

Emi Tosaka

Kazumi Yoshizaki

Kenichi Nakayama

Takeshi Kaburagi

Yushi Mikuriya

Manabu Ohno

Kohei Matsuda

Hiroki Ogino

Keiji Komoto

Kenta Kamikura

Tsutomu Shimano

Shinya Yachi

Koji Inaba

Motoya Fukushima

Junko Hirata

Koji Yamaguchi

Toru Oguma

Akira Kuroda

Hitoshi Itabashi

Yuki Nishizawa

Katsuyuki Nonaka

Taiji Katsura

Norikazu Fujimoto

Yuji Moriki

Kentaro Kawata

Shun Sato

Hiraku Sasaki

Kaori Noguchi

Masaki Yamada

Minoru Nakamura

Takashi Kenmoku

Hiroomi Matsuzaki

Makoto Hayashida

Kenji Okado

Tsuneyoshi Tominaga

Akane Masumoto

Masanori Ito

Masaaki Taya

Fumito Nonaka

Kazuki Matsumoto

Ryoichi Fujita

Yasuhiro Hashimoto

Satoshi Handa

Kunimasa Kawamura

Toshiyuki Ugai

Shohei Urushihara

Hideki Kaneko

Shiro Kuroki

Yasunori Toriyama

Kazunori Hashimoto

Junko Yoshikawa

Tetsuya Nishiguchi

Harumi Takada

Shohei Shibahara

Kohei Mizushima

Ken-ichi Nakayama

Ken-Ichi Nakayama

An image forming apparatus, to which a cartridge including a developer accommodating portion for accommodating a developer is detachably mountable, includes an image bearing member, an exposure unit configured to expose the image bearing member to light to form an electrostatic latent image on the image bearing member, a light receiving sensor provided in the cartridge and configured to receive the light emitted from the exposure unit, and a controller configured to detect vibration of the cartridge from a light reception value of the light received by the light receiving sensor. In a case in which the cartridge is removed from the image forming apparatus, the light receiving sensor is removed from the image forming apparatus together with the cartridge.

Image forming apparatus

An image forming apparatus includes, an image forming portion configured to form a toner image on a sheet using printing toner and apply powder adhesive on the sheet, a fixing portion configured to heat the toner image formed on the sheet and the powder adhesive applied on the sheet by the image forming portion and fix the toner image and the powder adhesive to the sheet, and a bonding portion configured to bond the sheet with the powder adhesive by reheating the sheet having been heated by the fixing portion. The bonding portion is arranged above the image forming portion.

Provided are a cleaning member that removes a developer from the surface of an image bearing member that is attached to an opening of a frame; a transport member that transports developer removed from the surface of the photosensitive member drum by the cleaning member, from an opening side of the frame towards an opposing deep side; and a driving unit for driving the transport member such that the transport member moves relatively to the cleaning member. The transport member is driven by the driving unit such that an absolute value of maximum acceleration at the time of movement of the transport member in a direction from the opening side of the frame towards the deep side is smaller than an absolute value of maximum acceleration at the time of movement in a direction from the deep side towards the opening side.

Cleaning unit, cartridge, image forming apparatus

Provided are a cleaning member that scrapes developer from a photosensitive drum attached to an opening of a cleaning frame, and a transport member that transports scraped developer from an opening side of the frame towards an opposing deep side. The transport member is driven such that an absolute value of maximum acceleration at the time of movement of the transport sheet in a direction from the opening side towards the deep side is smaller than an absolute value of maximum acceleration at the time of movement in a reverse direction of the former direction. In the longitudinal direction of the photosensitive drum, the width of the transport member is smaller than an abutting width of an abutting portion of the cleaning member with the photosensitive drum, and ends of the transport member in the longitudinal direction are positioned inward of ends of the abutting portion.

A toner including a toner particle that contains a binder resin, a polyester resin A and a wax, wherein the polyester resin A contains a specific amount of an isosorbide unit based on a total number of monomer units constituting the polyester resin A, the content of the polyester resin A is a specific amount, and when observing a cross-section of the toner, twenty toner particle cross-sections are selected that have a major axis R (&#x3bc;m) that satisfies a specific relationship with respect to the weight-average diameter D(&#x3bc;m) of the toner, each major axis r that have the largest major axis is measured for those domains composed of wax present in the selected toner particle cross-sections, and the arithmetic mean (r/R)st of the determined r/R satisfies a specific relationship.

Toner

Provided is a toner that has satisfactory chargeability and hardly causes a reduction in image density, fogging, and density unevenness in various environments ranging from a low-temperature and low-humidity environment to a high-temperature and high-humidity environment. The toner includes toner particles obtained by fixing resin particles to toner base particles each containing resins, in which: the resins contain 50.0 mass % or more of a styrene-acrylic resin and 1.0 to 40.0 mass % of a polyester resin A; the polyester resin A contains 0.10 to 30.00 number % of an isosorbide unit; the fixing amount of the resin particles to the toner base particles is from 0.1 to 5.0 parts by mass with respect to 100 parts by mass of the toner base particles; and the glass transition temperature of the resin particles is higher than the glass transition temperature of the toner base particles.

Provided are a developing unit alleviating fogging occurrence and an electrophotographic image forming apparatus providing images over long periods. The developing unit includes at least a toner of () and a developing roller of (). () When a displacement amount when a load is applied at Y&#xb0; C. and 9.8&#xd7;10N/sec to 2.94&#xd7;10N is X, a displacement amount when the toner is left to stand for 0.1 second is X, a displacement amount when the load is reduced at 9.8&#xd7;10N/sec to 0N is X, and percentage of (X&#x2212;X) to Xis Z(Y), 40&#x2266;Z(25)&#x2266;80 and 10&#x2266;Z(50)&#x2266;55 are satisfied; when a gradient from the origin to the maximum load in the load-displacement curve at 25&#xb0; C. is R(25), 0.49&#xd7;10&#x2266;R(25)&#x2266;1.70&#xd7;10is satisfied; the toner has glass transition temperature TgA (40&#xb0; C.-60&#xb0; C.) and maximum endothermic peak temperature P1 (70&#xb0; C.-110&#xb0; C.), 15&#xb0; C.&#x2266;(P1&#x2212;TgA)&#x2266;70&#xb0; C. is satisfied. () The developing roller includes a surface layer containing a urethane resin having structure (a), and one or both structures (b)-(c). 

Developing unit and electrophotographic image forming apparatus

The present invention provides a toner showing an excellent fixing property even in high-speed image formation and inhibiting contamination of the inside of an apparatus and thereby being capable of stably forming high-quality images not having unevenness of gloss over a long period of time. In the toner including toner particles containing a binder resin, an ester wax, and a coloring agent, the ester wax is prescribed by, in GC/MS analysis of components volatilized by heating the wax at 200&#xb0; C. for 10 minutes, a relationship in the components having carbon atoms in specific ranges.

A toner is provided which has toner particles and an inorganic fine powder; the toner particles being obtained by suspension polymerization using a specific polar resin. The toner is a toner in which; where, in displacement levels found in a micro-compression test in which a force is applied to a toner single particle at a loading rate of 9.8&#xd7;10N/sec to measure a displacement level (&#x3bc;m) at a point of time where the force has reached a maximum force of 4.90&#xd7;10N, the displacement level of the toner at a measurement temperature of 25&#xb0; C. is represented by X(25) and the displacement level of the toner at a measurement temperature of 50&#xb0; C. by X(50), and the number average particle diameter of the toner is represented by D (&#x3bc;m), the X(25), X(50) and D satisfies the relations:0.10&#x2266;(25)/&#x2266;0.35&#x2003;&#x2003;(1)30&#x2266;[(50)&#x2212;(25)]/(25)&#xd7;100&#x2266;150&#x2003;&#x2003;(2).

Toner and process for producing toner

The invention provides a toner that is capable of low-temperature fixing even in high-speed electrophotographic processes while keeping the cleaning performance when used at high temperatures and the high-temperature storage stability. This toner having toner particles, each of which contains a binder resin and a colorant is characterized in that the temperature of Tp [&#xb0; C.] when the loss elastic modulus obtained by dynamic viscoelastic measurements on the toner exhibits a maximum value in the temperature range from at least 30&#xb0; C. to not more than 200&#xb0; C., is from at least 40&#xb0; C. to not more than 55&#xb0; C., and in that, with G&#x2033;(Tp) [Pa] being this maximum value, G&#x2033;(Tp+15) [Pa] being the loss elastic modulus at the temperature of Tp+15 [&#xb0; C.], and G&#x2033;(Tp+30) [Pa] being the loss elastic modulus at the temperature of Tp+30 [&#xb0; C.], G&#x2033;(Tp), G&#x2033;(Tp+15), and G&#x2033;(Tp+30) satisfy prescribed relationships.

A toner includes a toner particle, which contains at least a binding resin, a colorant, and two types of polar resins, i.e., a polar resin H and a polar resin L, and which is obtained with granulation in a water-based medium, wherein solubility parameters, glass transition points, and weight-average molecular weights of the binding resin, the polar resin H, and the polar resin L, as well as amounts of the added resins satisfy respective specific relationships.

Toner and toner particle producing method

Provided is a toner including toner particles each containing at least a binder resin, a colorant, and a wax component, and an inorganic fine powder, the toner being wherein: in a microscopic compression test on the toner, a recovery ratio Z(25) and the gradient of a load-displacement curve R(25) each satisfy a specific range; and the toner has a glass transition temperature (TgA) measured with a differential scanning calorimeter (DSC) in a specific range and a temperature (P) of the highest endothermic peak measured with the DSC in a specific range, and the temperature (P) of the highest endothermic peak and the glass transition temperature (TgA) satisfy a specific relationship.

Provided is anon-magnetic toner including toner particles each containing at least a binder resin, a colorant, and a wax component, and an inorganic fine powder, in which: (1) when a temperature in a temperature range of 50 to 80&#xb0; C. at which a loss tangent (tan &#x3b4;) shows a maximum is represented by T1, a storage elastic modulus of the toner at the temperature T1 (G'(T1)) satisfies a relationship of 5.00&#xd7;10&#x2266;G&#x2032;(T1)&#x2266;1.00&#xd7;10(dN/m); (2) a continuous temperature range with a width of 15&#xb0; C. or more in which the loss tangent (tan &#x3b4;) is 0.80 to 2.00 is present in the temperature range of 50 to 80&#xb0; C.; and (3) the loss tangent (tan &#x3b4;) is 1.00 or more in a temperature range of 120 to 160&#xb0; C.

Non-magnetic toner

To achieve improvements in developing performance, transferring performance, and fixing performance, a toner has a glass transition temperature (TgA) of 40 to 60&#xb0; C. and a temperature (P1) of the highest peak of 70 to 120&#xb0; C.; cyclohexane (CHX) insoluble matter in the tetrahydrofuran (THF) soluble matter of the toner has a glass transition temperature (TgB) of 80 to 120&#xb0; C.; TgA and TgB satisfy a specific formula; the toner has a viscosity at 100&#xb0; C. of 5,000 to 30,000 Pa&#xb7;s; and the cyclohexane (CHX) insoluble matter has an acid value of 5 to 40 mgKOH/g.

Growing community of inventors

Susono, Japan

Yasushi Katsuta