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    • 41. 发明专利
    • Fixing device and image forming apparatus
    • 固定装置和图像形成装置
    • JP2011133539A
    • 2011-07-07
    • JP2009290483
    • 2009-12-22
    • Ricoh Co Ltd株式会社リコー
    • HASE TAKAMASAEBARA MASANAOISHII KENJIOGAWA SADAFUMIUENO TOMOSHISEO HIROSHIIMADA TAKAHIROYUASA SHUTARO
    • G03G15/20
    • G03G15/2039G03G2215/2048
    • PROBLEM TO BE SOLVED: To provide a fixing device using an electromagnetic induction heat system, which restricts fluctuations in temperature ripples on a fixing roller and stably controlling the temperature of the fixing roller during a standby period without sheet passing operation to maintain a predetermined temperature while heating and rotating the fixing roller, and to provide an image forming apparatus provided with the fixing device. SOLUTION: The fixing device includes: a fixing sleeve having a heating layer; a pressure roller to form a nip while contacting the fixing sleeve and to be driven to rotate the fixing sleeve; a temperature sensor to detect a temperature of the fixing sleeve; and an excitation coil provided near the fixing sleeve and configured to perform induction heating of the heating layer based on the detection result from the temperature detector. The fixing device changes a rotational speed of the fixing sleeve (S104), in a standby time during which the fixing sleeve, while rotating, is controlled to be heated so as to maintain a target temperature (S102), when a periodic temperature difference with a fluctuation amplitude larger than a predetermined value compared to the target temperature occurs on a circumference of the fixing rotary member (S103). COPYRIGHT: (C)2011,JPO&INPIT
    • 要解决的问题:提供一种使用电磁感应加热系统的定影装置,其限制定影辊上的温度波动的波动,并且在待机期间稳定地控制定影辊的温度而不进行片材通过操作以维持定影辊 同时加热和旋转定影辊,并提供一种具有定影装置的图像形成装置。 解决方案:定影装置包括:具有加热层的定影套筒; 压力辊,以在接触所述固定套筒的同时形成辊隙并被驱动以使所述固定套筒旋转; 用于检测定影套筒的温度的温度传感器; 以及励磁线圈,其设置在所述定影套筒附近,并且被配置为基于来自所述温度检测器的检测结果来执行所述加热层的感应加热。 定影装置在定影套筒同时旋转的待机时间内改变定影套筒的旋转速度(S104),在此期间,当定影套筒周期性温度差与 在定影旋转部件的圆周上发生与目标温度相比大于预定值的波动幅度(S103)。 版权所有(C)2011,JPO&INPIT
    • 47. 发明专利
    • Fixing device and image forming apparatus
    • 固定装置和图像形成装置
    • JP2014178520A
    • 2014-09-25
    • JP2013052812
    • 2013-03-15
    • Ricoh Co Ltd株式会社リコー
    • YAMAJI KENSUKEOGAWA SADAFUMIYUASA SHUTARO
    • G03G15/20
    • PROBLEM TO BE SOLVED: To provide a fixing device capable of suppressing a reduction in lubrication function of a slide member over time, and an image forming apparatus including the fixing device.SOLUTION: A fixing device 20 includes a rotatable endless fixing belt 21, heating means 23 for heating the fixing belt, a pressure member 22 that is brought into contact with an outer peripheral surface of the fixing belt, a nip forming member 24 that is arranged on an inner peripheral side of the fixing belt and brought into contact with the pressure member with the fixing belt therebetween to form a nip part N, a slide member 29 that is provided on the surface of the nip forming member to be rubbed onto an inner peripheral surface of the fixing belt and is impregnated with lubricant, and a guide member 40 that is provided to be contactable with the inner peripheral surface at both end parts in a width direction of the fixing belt and guides the rotation of the fixing belt. The fixing device 20 is further provided with lubricant supply means 50 for supplying the lubricant to the slide member.
    • 要解决的问题:提供一种能够抑制滑动构件随时间的润滑功能的降低的定影装置和包括该定影装置的图像形成装置。解决方案:定影装置20包括可旋转环形定影带21,加热 用于加热定影带的装置23,与定影带的外周表面接触的压力构件22,配置在定影带的内周侧并与定影带接触的夹持形成构件24 压力构件,其间具有定影带以形成咬合部分N;滑动构件29,设置在辊隙形成构件的表面上以摩擦到定影带的内周表面上并浸渍有润滑剂;导向件 构件40,其设置成能够在定影带的宽度方向上的两个端部处与内周面接触,并引导定影带的旋转。 定影装置20还设置有用于将润滑剂供给到滑动构件的润滑剂供给装置50。
    • 48. 发明专利
    • Fixing device and image forming apparatus
    • 固定装置和图像形成装置
    • JP2014178487A
    • 2014-09-25
    • JP2013052395
    • 2013-03-14
    • Ricoh Co Ltd株式会社リコー
    • YAMAGUCHI YOSHINORISEKI TAKAYUKIYOSHINAGA HIROSHIARAI YUJIIWATANI NAOKIIKEFUCHI YUTAKATAMAKI SHUNTAROSAITO KAZUYASHIMOKAWA TOSHIHIKOYUASA SHUTARO
    • G03G15/20
    • PROBLEM TO BE SOLVED: To provide a fixing device in which the top end of a separation conveyance guide can be positioned to a pressure roller with high accuracy, while holding the separation conveyance guide in a rotatable manner, with a simple configuration.SOLUTION: The fixing device includes an endless belt having flexibility and a pressure roller 21 facing and pressing the fixing belt, to form a nip. The fixing device includes a separation conveyance guide 41 comprising a plurality of components. The separation conveyance guide 41 includes a separation conveyance guide body 42 held by the pin 43 of the fixing device and a separation conveyance guide top end 44 which is held by the separation conveyance guide body 42 and movable with respect to the separation conveyance guide body 42 and whose position is determined by contact with the pressure roller 21, and which can be opened and closed around the pin 43 together with the separation conveyance guide body 42.
    • 要解决的问题:为了提供一种固定装置,其中分离输送引导件的顶端可以以可以以可旋转的方式保持分离输送引导件以高精度定位在压力辊上。结构简单: 定影装置包括具有柔性的环形带和面向并按压定影带的加压辊21,以形成辊隙。 定影装置包括包括多个部件的分离输送引导件41。 分离输送引导件41包括由定影装置的销43保持的分离输送引导体42和由分离输送引导体42保持并相对于分离输送引导体42移动的分离输送引导件顶端44 并且其位置通过与加压辊21接触而确定,并且可以与分离输送引导体42一起围绕销43打开和关闭。
    • 49. 发明专利
    • Fixing device and image forming apparatus
    • 固定装置和图像形成装置
    • JP2014170225A
    • 2014-09-18
    • JP2014021239
    • 2014-02-06
    • Ricoh Co Ltd株式会社リコー
    • YAMAMOTO TAKESHIKISHI KAZUTOWAIDA TAKUMISAMEI MASAHIROONO HIROSHIFUJIMOTO IPPEISEO HIROSHIYAMASHINA RYOTAISHIGAYA YASUNORIYOSHINAGA HIROSHIARAI YUJIMINBU RYUICHIYAMAGUCHI YOSHINORIIKEFUCHI YUTAKANAKAJIMA YUKIKOYUASA SHUTAROKAWABATA KEISUKEHATTORI YOSHIOSAITO KAZUYASHIMOKAWA TOSHIHIKO
    • G03G15/20
    • G03G15/2042G03G2215/2035
    • PROBLEM TO BE SOLVED: To provide a fixing device which is capable of saving power by reducing the amount of heat radiated from the surface of a fixing belt and to provide an image forming apparatus.SOLUTION: A fixing device 12 includes an endless fixing belt 38 rotatably provided, a contact member 30 rotatably provided and brought into contact with the outer peripheral surface of the fixing belt, to form a nip part SN between the contact member 30 and the fixing belt, and heating means 56 provided in contact with the inner peripheral surface of the fixing belt and heating the fixing belt. The heating means includes a plurality of heat sources 55 in the width direction of a recording material orthogonal to the conveyance direction of the recording material, and changes a heating region by each heat source, to heat the fixing belt, according to an unfixed image on the recording material, based on image data, so that the unfixed image on the recording material passed through the nip part is fixed to the recording material by at least the heat. In the fixing device 12, the heating means is provided in a part excluding the part of the fixing belt forming the nip part.
    • 要解决的问题:提供一种定影装置,其能够通过减少从定影带的表面辐射的热量来节省电力并提供图像形成装置。解决方案:定影装置12包括环形定影带38 可旋转地设置有可旋转地设置并与定影带的外周面接触的接触构件30,以在接触构件30和定影带之间形成咬合部SN,以及与内周面接触的加热装置56 定影带的表面并加热定影带。 加热装置包括在与记录材料的传送方向正交的记录材料的宽度方向上的多个热源55,并且根据每个热源改变加热区域,以根据未定影的图像加热定影带 记录材料基于图像数据,使得通过夹持部分的记录材料上的未定影图像至少被热固定到记录材料上。 在定影装置12中,加热装置设置在除了形成压区部分的定影带的部分之外的部分中。
    • 50. 发明专利
    • Fixing device and image forming apparatus
    • 固定装置和图像形成装置
    • JP2014170137A
    • 2014-09-18
    • JP2013042393
    • 2013-03-04
    • Ricoh Co Ltd株式会社リコー
    • YOSHINAGA HIROSHISEKI TAKAYUKIARAI YUJIMINBU RYUICHIIKEFUCHI YUTAKAYAMAGUCHI YOSHINORITAMAKI SHUNTAROSAITO KAZUYAYUASA SHUTAROSHIMOKAWA TOSHIHIKO
    • G03G15/20
    • G03G15/2053G03G2215/2035
    • PROBLEM TO BE SOLVED: To provide an image forming apparatus and a fixing device capable of suppressing deflection and twist of a nip forming member that can occur at the start of rotation of a fixing belt.SOLUTION: A fixing device includes a fixing belt, a pressure roller that rotationally drives while pressing an outer peripheral surface of the fixing belt to cause the fixing belt to be driven to rotate, a nip forming member that is arranged on an inner peripheral side of the fixing belt and is brought into contact with the pressure roller with the fixing belt therebetween to form a nip part, a support member that is arranged on the inner peripheral side of the fixing belt to support the nip forming member, and heating means for heating the fixing belt. The support member includes at least a parallel part that supports the nip forming member and is parallel to a paper conveyance direction at a nip part, and a rising part that rises from the parallel part in a direction separated from the nip part; and the rising part is parallel to a virtual straight line connecting a rotation center of the fixing belt and an entrance of the nip part, or is inclined with respect to the parallel part within a rotation angle range in which the virtual straight line is rotated ±15° with the rotation center as a fulcrum.
    • 要解决的问题:提供一种能够抑制在定影带的旋转开始时可能发生的夹持形成构件的偏转和扭曲的图像形成装置和定影装置。解决方案:定影装置包括定影带, 压力辊,其在按压定影带的外周面的同时旋转驱动以使定影带被驱动旋转;辊隙形成构件,其布置在定影带的内周侧并与压力接触 辊之间具有定影带以形成咬合部,布置在定影带的内周侧以支撑辊隙形成部件的支撑部件,以及用于加热定影带的加热装置。 所述支撑构件至少包括支撑所述辊隙形成构件的平行部分,并且在夹持部分处平行于纸张输送方向,并且在与所述夹持部分分离的方向上从所述平行部分上升的上升部分; 并且上升部分平行于连接定影带的旋转中心和夹持部的入口的虚拟直线,或者在虚拟直线旋转±的旋转角度范围内相对于平行部倾斜 15°以旋转中心为支点。