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    • 1. 发明专利
    • 定着装置および画像形成装置
    • 固定装置和图像形成装置
    • JP2015036771A
    • 2015-02-23
    • JP2013168450
    • 2013-08-14
    • 株式会社リコーRicoh Co Ltd
    • SUGANUMA TAKUYAYURA JUNUCHITANI TAKESHISUKESAKO MASAKIISHII HIROKITAKESHITA HIRONOBUKEZUKA SHOGO
    • G03G15/20
    • G03G15/2039G03G15/2042G03G15/2082G03G15/231
    • 【課題】画像領域選択加熱定着方式において、記録媒体にシワが発生することを防止する。【解決手段】定着ニップ部Nを形成する定着ローラ22および加圧ローラ21と、用紙Pの搬送方向と直交する長手方向に複数分割された加熱領域をそれぞれ加熱する発熱体を有し、定着ローラ22を加熱する加熱部材23と、を備え、定着ニップ部Nに搬送される用紙Pの未定着画像が、画像領域と非画像領域とを有する時に、非画像領域に対応する温度T2が画像領域に対応する温度T1よりも低くなるように発熱体への供給電力が制御される定着装置20において、非画像領域に対応する発熱体のうち、画像領域に対応する発熱体と隣接する発熱体については、温度T1と温度T2との差よりも小さい値を&Dgr;Tとして、温度T1−&Dgr;Tとなるように供給電力を制御するとともに、両面印刷時における第1面の印刷時と、片面印刷時では、&Dgr;Tを変化させる。【選択図】図2
    • 要解决的问题:为了防止记录介质在图像区域选择加热定影方法中起皱。解决方案:定影装置20包括:定影辊22和用于形成定影夹持部分N的加压辊21; 以及加热构件23,其具有用于加热区域的加热元件,该加热元件沿与纸张P的输送方向正交的纵向方向分割,以加热定影辊22.当传送到定影夹持部分N的纸张P上的未定影图像包括 图像区域和非图像区域,控制供给到加热元件的电力,使得与非图像区域对应的温度T2低于与图像区域对应的温度T1。 在与对应于图像区域的加热元件相邻的非图像区域的加热元件中,控制供给的电力以满足温度T1-&Dgr; T,&Dgr; T小于差 在温度T1和温度T2之间。 &Dgr; T在单面打印期间和打印第一个表面进行双面打印时是不同的。
    • 2. 发明专利
    • 画像形成装置
    • 图像形成装置
    • JP2014228638A
    • 2014-12-08
    • JP2013107125
    • 2013-05-21
    • 株式会社リコーRicoh Co Ltd
    • ISHII HIROKIYURA JUNUCHITANI TAKESHISUKESAKO MASAKISUGIYAMA HIROYUKISUGANUMA TAKUYATAKESHITA HIRONOBU
    • G03G15/20G03G21/00G03G21/14
    • 【課題】未定着トナーが記録材に付着したまま残らないようにすることができる画像形成装置を提供する。【解決手段】加熱制御手段67は、トナー像を形成するための画像情報から各加熱領域を独立して制御することによって、未定着画像の画像領域に対応する各加熱領域で定着ローラ62を定着温度に加熱し、かつ、未定着画像の非画像領域に対応する各加熱領域で定着ローラ62の定着温度よりも低い温度に加熱し、中間転写ベルト41に担持したトナー像を記録材Pに未定着画像として転写した後の中間転写ベルト41に残トナーtが付着しているか否かを検知する残トナー検知部46を備え、加熱制御手段67は、残トナー検知部46で中間転写ベルト41に残トナーtが付着していることを検知した場合には、その検出結果に基づくトナー付着情報を、サーマルヒータ群63による定着ローラ62への加熱状態を制御する運転制御情報として用いる。【選択図】図3
    • 要解决的问题:提供一种图像形成装置,其被配置为防止未定影的调色剂残留在记录材料上。解决方案:加热控制装置67独立于用于形成调色剂图像的图像信息来控制加热区域,以加热定影辊62 在对应于未定影图像的图像区域的每个加热区域中定影温度,并且在对应于未定影图像的非图像区域的每个加热区域中,在低于定影温度的温度下加热定影辊62。 残留调色剂检测单元46检测在将中间转印带41上承载的调色剂图像转印到作为未定影图像的记录材料P之后,残留调色剂t是否粘附到中间转印带41。 当残留调色剂检测单元46检测到粘附到中间转印带41的残留调色剂t时,加热控制装置67使用基于检测结果的调色剂粘附信息作为用于控制热加热器组的状态的操作控制信息 63加热定影辊62。
    • 3. 发明专利
    • Developing device, process cartridge, and image forming apparatus
    • 开发设备,过程盒和图像形成装置
    • JP2014157321A
    • 2014-08-28
    • JP2013028885
    • 2013-02-18
    • Ricoh Co Ltd株式会社リコー
    • KAMIHARA KAZUAKIYURA JUNUCHITANI TAKESHISUKESAKO MASAKISUGANUMA TAKUYASUGIYAMA HIROYUKITAKESHITA HIRONOBU
    • G03G15/08
    • PROBLEM TO BE SOLVED: To provide a developing device that maintains dispersibility of a supplied toner to a developer even after a long-term use to prevent the occurrence of toner scattering and scumming.SOLUTION: A developing device uses a two-component developer comprising a toner and a carrier, and comprises: a developing roller; a conveyance path and a conveying member of the developer; a toner supply port; and a magnetic field generator capable of varying output magnetic flux density. The magnetic field generator is provided above the conveyance path and downstream in a developer conveyance direction of the toner supply port, and attracts the developer in the conveyance path to form a wall of the developer. The developing device further includes a magnetism control device varying the magnetic flux density of the magnetic field generator, so as to vary the magnetic flux density of the magnetic field generator on the basis of at least two pieces of information on the cumulative number of prints and toner consumption per unit number of prints (image area ratio) of the developing device.
    • 要解决的问题:提供一种显影装置,其即使在长期使用后也将供应的调色剂的分散性维持在显影剂上,以防止调色剂飞散和浮渣的发生。解决方案:显影装置使用双组分显影剂,其包含 调色剂和载体,并且包括:显影辊; 显影剂的输送路径和输送构件; 调色剂供应口; 以及能够改变输出磁通密度的磁场发生器。 磁场发生器设置在传送路径的上方并且在调色剂供给口的显影剂输送方向的下游,并且吸引显影剂在输送路径中以形成显影剂的壁。 显影装置还包括磁控制装置,其改变磁场发生器的磁通密度,以便根据关于累积打印数量的至少两条信息来改变磁场发生器的磁通密度;以及 显影装置的每单位打印数量(图像面积比)的调色剂消耗量。
    • 4. 发明专利
    • Carrier supply device, process cartridge and image forming apparatus
    • 载体供应装置,工艺盒和图像形成装置
    • JP2014157319A
    • 2014-08-28
    • JP2013028881
    • 2013-02-18
    • Ricoh Co Ltd株式会社リコー
    • KAMIHARA KAZUAKIYURA JUNIWASAKI YUKIKOYOTSUORI ATSUSHISUKESAKO MASAKISUGANUMA TAKUYASUGIYAMA HIROYUKITAKESHITA HIRONOBU
    • G03G15/08
    • PROBLEM TO BE SOLVED: To provide a carrier supply device which suppresses variation of charging capability of carrier while refreshing the carrier.SOLUTION: A carrier supply device comprises a sub-hopper 82 which makes a mixture 83 by mixing powder 75 having inorganic fine particles, etc. externally attached thereto with supply carrier 74. The carrier supply device also comprises branched two carrier supply paths 78, 80 for supplying the carrier 74 to the sub-hopper 82 and a developing unit 7. The two carrier supply paths shaped in Y have their inlet in the direction of a carrier storage container, and their outlets in the two directions of the sub-hopper and the developing unit 7. The carrier supply device further comprises a supply path 81 for supplying the powder 75 to the sub-hopper 82 and a supply path 84 for supplying the mixture 83 to the developing unit 7. A control is operated for switching whether or not the supply carrier 74 is directly supplied to the developing unit 7 or to the sub-hopper 82 after the supply carrier 74 being made into the mixture 83, on the basis of accumulation printing number information and image area rate information which is toner consumption per printing number unit.
    • 要解决的问题:提供一种在刷新载体时抑制载体的充电能力变化的载体供给装置。解决方案:载体供给装置包括通过混合具有无机细颗粒的粉末75制成混合物83的副料斗82, 载体供给装置还包括用于将载体74供给到副料斗82的分支的两个载体供给路径78,80和显影单元7.成形为Y的两个载体供给路径具有 它们在载体储存容器的方向上的入口,以及它们在副料斗和显影单元7的两个方向上的出口。载体供给装置还包括用于将粉末75供给到副料斗82的供给路径81 以及用于将混合物83供给到显影单元7的供给路径84.操作控制器,切换供应托架74是否直接供应到显影单元7或t o在供应托架74制成混合物83之后,基于累积打印数量信息和作为​​每打印数量单位的调色剂消耗的图像区域速率信息的副料斗82。
    • 6. 发明专利
    • Image forming apparatus
    • 图像形成装置
    • JP2012242752A
    • 2012-12-10
    • JP2011114978
    • 2011-05-23
    • Ricoh Co Ltd株式会社リコー
    • SUKESAKO MASAKIYURA JUNSUGIYAMA HIROYUKIIWASAKI YUKIKOYOTSUORI ATSUSHIKAMIHARA KAZUAKITAKESHITA HIRONOBUKIDERA RYOTA
    • G03G15/20G03G15/00G03G15/01
    • PROBLEM TO BE SOLVED: To provide an image forming apparatus capable of setting a target fixing temperature to an optimum temperature for every one page and satisfactorily performing fixing processing without reducing productivity.SOLUTION: The image forming apparatus according to the present invention is configured to be able to change a target fixing temperature of a specific recording medium by a target fixing temperature variable means 46 based on the target fixing temperature of the specific recording medium set by target fixing temperature setting means 37, the target fixing temperature of the recording medium subsequently subjected to fixing processing, and moreover, a target fixing temperature variable means 46 based on the time from a prescribed timing at the fixing processing of the specific recording medium to the fixing processing starting time of the recording medium subsequently subjected to the fixing processing.
    • 要解决的问题:提供能够将目标定影温度设定为每一页的最佳温度并且令人满意地执行定影处理而不降低生产率的图像形成装置。 解决方案:根据本发明的图像形成装置被配置为能够基于特定记录介质组的目标定影温度,由目标定影温度可变装置46改变特定记录介质的目标定影温度 通过目标固定温度设定装置37,随后进行定影处理的记录介质的目标定影温度,以及目标定影温度可变装置46,基于从特定记录介质的定影处理的规定定时开始的时间 接着进行定影处理的记录介质的定影处理开始时间。 版权所有(C)2013,JPO&INPIT
    • 7. 发明专利
    • Image forming apparatus
    • 图像形成装置
    • JP2011170215A
    • 2011-09-01
    • JP2010035562
    • 2010-02-22
    • Ricoh Co Ltd株式会社リコー
    • YOTSUORI ATSUSHIMIURA TETSUOIWASAKI YUKIKOOJIMI ATSUYAYURA JUNTAKAHASHI HIROAKISUKESAKO MASAKISUGIYAMA HIROYUKIKAMIHARA KAZUAKI
    • G03G15/01G03G15/08G03G15/16G03G21/00G03G21/14
    • PROBLEM TO BE SOLVED: To provide an image forming apparatus capable of preventing an abnormal image and consumption of a great amount of toner due to developer dropping from a developer carrier or developer pumping up failure in image formation, while suppressing increase in the cost and enlargement of the apparatus. SOLUTION: The developer existing in a developing nip formed by a photoreceptor 3 and a developing sleeve 15 is removed, by having the developing sleeve 15 of a developing unit 7, which is not used for image formation, when forming a color image rotated once in the reverse direction as in a normal image formation, before starting of the image formation after the color image forming request is inputted. Afterwards, the developing sleeve 15 of the developing unit 7 that is not use for that image formation is stopped without being driven. The failure due to contact between the developer on the developing sleeve 15, which has its driving stopped and the photoreceptor 3 can be prevented, since the developer in the developing nip is removed, when the developing sleeve 15 is stopped. COPYRIGHT: (C)2011,JPO&INPIT
    • 要解决的问题:提供一种图像形成装置,能够防止由于显影剂从显影剂载体或显影剂下降而引起的大量调色剂的图像形成,同时抑制图像形成中的增加, 成本和放大的装置。 解决方案:当形成彩色图像时,通过具有不用于图像形成的显影单元7的显影套筒15,去除存在于由感光体3和显影套筒15形成的显影辊隙中的显影剂 在正常图像形成之后,在输入彩色图像形成请求之后的图像形成开始之前沿相反方向旋转一次。 之后,显影单元7的不用于该图像形成的显影套筒15停止而不被驱动。 当显影套筒15停止时,由于显影辊隙中的显影剂被去除,所以可以防止由于显影套筒15上的显影剂与驱动器之间的接触导致的故障。 版权所有(C)2011,JPO&INPIT
    • 9. 发明专利
    • Belt fixing device and image forming apparatus
    • 带固定装置和图像形成装置
    • JP2011090340A
    • 2011-05-06
    • JP2011014347
    • 2011-01-26
    • Ricoh Co Ltd株式会社リコー
    • KUROTAKA SHIGEOBABA SATOHIKOFUJITA TAKASHIIKEGAMI HIROKAZUKIKUCHI HISASHINAKATO ATSUSHIOSHIMA KIYOSHIYURA JUN
    • G03G15/20G03G9/08
    • PROBLEM TO BE SOLVED: To provide a belt fixing device in which separation performance is improved by reducing the radius of curvature of a separating part, and self-separation, that is, self-stripping of a recording sheet after a single-face or double-face fixing can be carried out without application of oil or use of a separating means such as separation pawls and a separation guide plate.
      SOLUTION: The belt fixing device includes a fixing roller 104, a heating roller 106, a fixing belt 103 stretched over both rollers, and a pressurizing roller 105 in contact with the outer circumference face of the belt 103 to form a nip with the fixing belt 103. The device also includes a fixing member 108 having an exit separation face shaped into a large curvature, disposed inside the fixing belt 103 at a position corresponding to the exit separation part of the nip formed by the fixing roller 104 and the pressurizing roller 106 via the fixing belt 103.
      COPYRIGHT: (C)2011,JPO&INPIT
    • 要解决的问题:提供一种带式定影装置,其中通过减小分离部分的曲率半径来提高分离性能,并且自分离,即在单次打印之后自动剥离记录片材, 面或双面固定可以在不施加油或使用诸如分离爪和分离导向板的分离装置的情况下进行。 解决方案:带固定装置包括定影辊104,加热辊106,在两个辊上拉伸的定影带103和与带103的外周面接触的加压辊105,以形成带 该装置还包括具有形成大曲率的出口分离面的固定构件108,其设置在定影带103内部的与由定影辊104形成的辊隙的出口分离部分相对应的位置处, 加压辊106经由定影带103。版权所有(C)2011,JPO&INPIT