Patent application number | Description | Published |
20090080940 | Developer, developer cartridge, image forming unit and image forming apparatus - A developer is produced by a process including mixing at least a binder resin and internal additive particles. The internal additive particles have diameters in a range from 15 μm to 212 μm. The internal additive particles have higher melting point than the binder resin. | 03-26-2009 |
20090185836 | Developer, developer storage unit, developing device, and image forming apparatus - Developer includes toner formed of base particles containing at least a binder resin. The base particles have surfaces coated with an additive agent, and the toner has a volume average particle size between 3.9 μm and 6.1 μm. The developer further includes agglomerates in an amount between 0.01 wt % and 0.10 wt %. The agglomerates have a volume average particle size between 75 μm and 100 μm. | 07-23-2009 |
20090190957 | Image forming apparatus - An image forming apparatus includes a plurality of developing devices. Each developing devices performs an electrophotographic process to form an image. The image forming apparatus comprises a first developing device and a second developing device. The first developing device holds a black developer containing a first black coloring agent. The second developing device holds a gray developer. The gray developer contains a second black coloring agent and a coloring agent of a chromatic color. The chromatic color is a complementary color to the second black coloring agent. | 07-30-2009 |
20090317144 | Image forming unit and image forming apparatus - An image forming unit includes a developer bearing body that supplies a developer to an image bearing body that bears a latent image, and a developer layer forming member that forms a layer of the developer on the developer bearing body. The developer has a mean volume diameter in a range from 3.0 to 5.0 μm, and a bulk density in a range from 0.26 to 0.32 g/cm | 12-24-2009 |
20100232850 | Image forming unit and image forming apparatus - An image forming unit includes an image bearing body on which a latent image is formed, a charging member that charges the image bearing body, a developer bearing body that develops the latent image on the image bearing body using a developer so as to form a developer image, a transfer portion that transfers the developer image to a medium, a cleaning member that removes an adhering matter adhering to part of the image bearing body after the part of the image bearing body passes the transfer portion, a collection roller provided so as to form a contact portion between the collection roller and the image bearing body and is located between the cleaning member and the charging member, and a collection roller power source that applies a voltage to the collection roller. The voltage has the same polarity as a polarity of the developer. | 09-16-2010 |
20110052288 | CLEANING DEVICE AND IMAGE FORMING APPARATUS - A cleaning device includes a developer removal member, a support member and a fixation member. The developer removal member is in contact with an adherend to which developer adheres and removes the developer from the adherend. The support member has a first end where a bent portion is formed and a second end opposite to the first end. The support member also supports the developer removal member in the vicinity of the bent portion. The fixation member holds the second end of the support member. | 03-03-2011 |
20110103841 | Developer, developer cartridge, developing unit, and image forming apparatus - A developer contains a resin, a coloring agent, and an external additive in an amount of 2.5 to 4.5 weight parts added to the resin in an amount of 100 weight parts resin. The developer has an average volume mean particle diameter in the range of 4.5 to 6.5 μm and a BET specific surface in the range of 2.45 to 3.74 m | 05-05-2011 |
20110135360 | IMAGE FORMING UNIT AND IMAGE FORMING DEVICE - An image forming device includes a plurality of image forming units each including a developer carrier that carries developer; an image carrier that forms a developer image on a surface layer with the developer supplied from the developer carrier; and a developer collector that is positioned to contact the surface layer of the image carrier and that removes residual developer after transferring the developer image formed on the surface layer onto a recording sheet. Wherein the developer collector in a first image forming unit has a higher linear contact pressure against the surface layer of the image carrier than that of other image forming units, and a thickness of the surface layer of the image carrier of the first image forming unit is greater than a thickness of the image carrier of the other image forming units. | 06-09-2011 |
20120087697 | IMAGE FORMING APPARATUS THAT INCLUDES A FIRST DEVELOPING DEVICE THAT HOLDS A BLACK DEVELOPER AND A SECOND DEVELOPING DEVICE THAT HOLDS A GRAY DEVELOPER - An image forming apparatus includes a plurality of developing devices. Each developing devices performs an electrophotographic process to form an image. The image forming apparatus comprises a first developing device and a second developing device. The first developing device holds a black developer containing a first black coloring agent. The second developing device holds a gray developer. The gray developer contains a second black coloring agent and a coloring agent of a chromatic color. The chromatic color is a complementary color to the second black coloring agent. | 04-12-2012 |
20130078001 | IMAGE FORMING APPARATUS - An image forming apparatus includes a first image forming unit configured to form a white developer image on a recording medium using a white developer, at least one second image forming unit configured to form at least one single-color developer image on the recording medium using at least one single-color developer other than the white developer, and a fixing unit configured to fix the white developer image and the at least one single-color developer image to the recording medium so as to form a white image and at least one single-color image. A haze value of the white image is higher than a haze value of each of the at least one single-color image. | 03-28-2013 |
20130230342 | IMAGE FORMING UNIT AND IMAGE FORMING APPARATUS - An image forming unit includes a developer bearing body that bears a developer, and a supplying member provided so as to face the developer bearing body. The supplying member rotates to thereby collect the developer from the developer bearing body and supply the developer to the developer bearing body. The image forming unit further includes a developer storage portion that stores the developer to be supplied to the supplying member, and a charge providing member that charges the developer held on the supplying member. In a rotating direction of the supplying member, the charge providing member is disposed on a downstream side of an opposing portion between the developer bearing body and the supplying member and on an upstream side of a region where the developer storage portion supplies the developer to the supplying member. | 09-05-2013 |
20150185681 | IMAGE FORMATION APPARATUS - An image formation apparatus includes an image carrier, a charge device configured to charge the surface of the image carrier, a development device configured to pass a developer to an electrostatic latent image on the image carrier formed by exposure, a transfer device configured to transfer a developer image formed on the image carrier onto a medium, a remover device configured to remove the developer on the image carrier, and a controller configured to control a cleaning mode for removing extraneous matter adhered to the surface of the charge device at a time other than the time for the process of exposing the image carrier, and to change the execution frequency of the cleaning mode in accordance with an environmental condition. | 07-02-2015 |
Patent application number | Description | Published |
20090016767 | Developer storing container, developing unit, developing device and image forming apparatus - A developer storing container includes a developer storing body having a first opening, and a shutter member capable of taking a closing position and an opening position to close and open the first opening. The shutter member includes a first seal member including a seal portion provided along the first opening and an extending portion extending from the seal portion in the opening direction of the shutter member. A distance from an end portion of the first opening in the opening direction to an end of the extending portion when the shutter member is in the closing position is longer than a distance of an end portion of an exposable portion of the first seal member (exposed via the first opening when the shutter member is in the closing position) when the shutter member moves from the closing position to the opening position. | 01-15-2009 |
20090238609 | Powder developer holding apparatus, developing apparatus, and image forming apparatus - A powder developer holding apparatus prevents developer leakage. A housing holds powder developer, and includes a discharging opening through which the powder developer is discharged. A shutter is mounted to the housing and is rotatable relative to the housing to an opening position where the discharging opening is opened or to a closing position where the discharging opening is closed. A locking member is slidably mounted to the shutter. When the powder developer holding apparatus is oriented such that the discharging opening faces upward in a gravitational direction, the locking member prevents the shutter from rotating relative to the chamber. | 09-24-2009 |
20090245883 | Developer material holding apparatus, process cartridge to which the developer material holding apparatus is attached,and image forming apparatus to which the process cartridge is a attached - A developer material holding apparatus holds a developer. A body holds a developer material and includes a first opening through which the developer material is discharged. A shutter is assembled to the body, and is movable either to an opening position where the developer material is discharged from the body or to a closing position where the developer material is not discharged from the body. The shutter includes a second opening such that when the shutter is at the opening position, the second opening is in alignment with the first opening. At least one of the first opening and the second opening is in the form a mesh including a plurality of openings. | 10-01-2009 |
20100111571 | Developer storing container, developing device and image forming apparatus - A developer storing container includes a developer storing chamber storing a developer therein and having a side wall, and an agitating member having a shaft portion rotatably supported by the side wall. The side wall has a hollow portion surrounding the shaft portion of the agitating member. A seal member having an annular shape is provided between the hollow portion and the shaft portion. The seal member has an outer circumferential surface contacting the hollow portion, and an inner circumferential surface contacting the shaft portion. A contact pressure between the outer circumferential surface of the seal member and the hollow portion is larger than a contact pressure between the inner circumferential surface of the seal member and the shaft portion of the agitating member. | 05-06-2010 |
20150212481 | IMAGE FORMATION UNIT AND IMAGE FORMATION APPARATUS - A housing for an electrostatic latent image carrier is formed with a groove in which a light emitting section of the exposure device is positioned at the usage position. The groove extends in an insertion direction of the light emitting section of the exposure device to the groove. A flexible light-shielding member includes one side fixed to a peripheral part of the groove. The light-shielding member covers the groove when the exposure device is detached from the housing. When the exposure device is attached to the housing, the light-shielding member is bent by the exposure device into the groove. A guide is provided at the upstream end portion of the light-shielding member in the insertion direction. The guide guides the light-shielding member from the closing state to the bent state upon inserting the light emitting section of the exposure device into the groove. | 07-30-2015 |