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    • 1. 发明专利
    • Fixing device and image forming apparatus
    • 固定装置和图像形成装置
    • JP2014174440A
    • 2014-09-22
    • JP2013048951
    • 2013-03-12
    • Ricoh Co Ltd株式会社リコー
    • ARAI YUJISEKI TAKAYUKIMINBU RYUICHIYAMAGUCHI YOSHINORITAMAKI TOSHITAROSHIMOKAWA TOSHIHIKOIKEBUCHI YUTAKAYOSHINAGA HIROSHISAITO KAZUYAYUASA SHUTARO
    • G03G15/20
    • PROBLEM TO BE SOLVED: To provide a fixing device with a simple configuration capable of achieving energy saving and a reduction in first print time, and suppressing an increase in temperature at end parts without reducing productivity.SOLUTION: A fixing device includes a fixing rotating body, a heat source that heats the fixing rotating body, a non-rotatable nip forming member that is brought into contact with the fixing rotating body inside the fixing rotating body, a pressure rotating body that forms a nip with the nip forming member with the fixing rotating body therebetween, and a support member that receives a pressure applied to the nip forming member. The fixing device further includes a shield member that can be moved between an inner surface of the fixing rotating body and the heat source, and the shield member is constantly in contact with the support member.
    • 要解决的问题:提供具有能够实现节能并且缩短第一打印时间的简单配置的定影装置,并且在不降低生产率的情况下抑制端部温度的升高。解决方案:一种定影装置,包括固定旋转体 ,加热固定旋转体的热源,与固定旋转体内的固定旋转体接触的不可旋转的夹持形成部件,与固定旋转体的固定旋转体形成辊隙的压力旋转体 旋转体,以及承受施加到辊隙形成构件的压力的支撑构件。 定影装置还包括能够在固定旋转体的内表面和热源之间移动的屏蔽构件,并且屏蔽构件不断地与支撑构件接触。
    • 4. 发明专利
    • Fixation device and image formation device
    • 固定装置和图像形成装置
    • JP2013195947A
    • 2013-09-30
    • JP2012065798
    • 2012-03-22
    • Ricoh Co Ltd株式会社リコー
    • IMADA TAKAHIROYOSHIKAWA MASAAKIISHII KENJIARAI YUJIOGAWA SADAFUMITAKAGI HIROTADAIWATANI NAOKIYAMAGUCHI YOSHINORIYOSHIURA ARINOBUKAWADA TEPPEIGOTO SOSHIMOKAWA TOSHIHIKOYAMAJI KENSUKESUZUKI AKIRA
    • G03G15/20
    • PROBLEM TO BE SOLVED: To eliminate poor fixation and defective paper conveyance due to bending of a support stay caused by loading, without increasing the number of parts.SOLUTION: The shape of a fixation belt 11 during rotation is restricted by a belt guide 12. A nip formation member 14 makes the fixation belt 11 come in contact with a pressure roller 13 in a prescribed area of a circumferential direction along the axial direction of the pressure roller 13 to form a nip. A support stay 15 supports the nip formation member 14 against a pressure direction by the pressure roller 13. The fixation belt 11 is heated from inside by a heater 16. The support stay 15 is configured by overlapping at least two kinds of metals having different linear expansion coefficients in a pressure direction, a high expansion side metal 151 and a low expansion side metal 152. The side closer to the pressure roller 13 is the high expansion side metal 151.
    • 要解决的问题:为了消除由于加载导致的支撑支柱的弯曲而导致的不良固定和纸输送不良,而不增加部件数量。解决方案:旋转期间的定影带11的形状受到带引导件12的限制。 辊隙形成构件14使得定影带11沿着加压辊13的轴向在周向的规定区域中与加压辊13接触以形成辊隙。 支撑支撑件15通过加压辊13支撑压力形成构件14抵抗压力方向。固定带11由加热器16从内部加热。支撑撑条15通过将至少两种具有不同线性的金属 压力方向的膨胀系数,高膨胀侧金属151和低膨胀侧金属152.靠近加压辊13的一侧是高膨胀侧金属151。
    • 6. 发明专利
    • Fixing device, and an image forming apparatus
    • 固定装置和图像形成装置
    • JP2013195858A
    • 2013-09-30
    • JP2012064614
    • 2012-03-22
    • Ricoh Co Ltd株式会社リコー
    • IWATANI NAOKISATO MASAHIKOYOSHIKAWA MASAAKIYOSHINAGA HIROSHIISHII KENJIOGAWA SADAFUMITAKAGI HIROTADAUCHITANI TAKESHISESHIMO TAKUYAIMADA TAKAHIROGOTO SOSUZUKI AKIRAKAWADA TEPPEISHIMOKAWA TOSHIHIKOYOSHIURA ARINOBUHASE TAKAMASAYUASA SHUTAROYAMAJI KENSUKE
    • G03G15/20
    • G03G15/2064G03G15/2053G03G2215/2035
    • PROBLEM TO BE SOLVED: To provide a fixing device and an image forming apparatus in which, when a pressure rotating body is moved to a fixing belt in the separation direction by a pressure reducing mechanism, engagement of a pressure rotating body gear with a counterpart gear engaging with that gear is likely to be maintained without enlarging a moving range of the pressure rotating body so much.SOLUTION: In a fixing device, a pressure rotating body 31 is provided which is rotated and driven by a driving force inputted from a driving source 71, and pressure reducing mechanisms 63, 68, 69 are also provided in which the pressure rotating body 31 is moved against a fixing belt 21 in the separating direction to reduce a pressure contact force of the pressure rotating body 31 to the fixing belt 21. Then, the pressure rotating body 31 is held by a first holding member 43 having a notch 43a whose one end side in the width direction extending to the fixing belt 21 in the direction in the pressure contact direction is formed, and also held by a second holding member 63 having a slot 63b whose other end side in the width direction extending in the direction of intersecting with the pressure contact direction is formed.
    • 要解决的问题:提供一种定影装置和图像形成装置,其中当压力旋转体通过减压机构沿分离方向移动到定影带时,压力旋转体齿轮与对应齿轮的接合 在不增加压力旋转体的移动范围的情况下,可能维持与该齿轮的接合。解决方案:在定影装置中,设置有压力旋转体31,该压力旋转体31由从驱动源输入的驱动力旋转和驱动 71还设有减压机构63,68,69,其中压力旋转体31沿分离方向抵靠定影带21移动,以减小压力旋转体31对定影带21的压力接触力。 然后,压力旋转体31被第一保持构件43保持,该第一保持构件43具有切口43a,该切口43a的宽度方向的一端侧沿着压榨方向延伸至定影带21 形成再接触方向,并且还由具有狭缝63b的第二保持构件63保持,第二保持构件63形成沿与压接方向交叉的方向延伸的宽度方向上的另一端侧。
    • 7. 发明专利
    • Fixing device and image forming apparatus
    • 固定装置和图像形成装置
    • JP2013186352A
    • 2013-09-19
    • JP2012052373
    • 2012-03-08
    • Ricoh Co Ltd株式会社リコー
    • SUZUKI AKIRAYOSHIKAWA MASAAKIISHII KENJIOGAWA SADAFUMIUCHITANI TAKESHITAKAGI HIROTADAIWATANI NAOKISESHIMO TAKUYAYOSHIURA ARINOBUKAWADA TEPPEIIMADA TAKAHIROGOTO SOHASE TAKAMASASHIMOKAWA TOSHIHIKOARAI YUJIYAMAGUCHI YOSHINORIYUASA SHUTAROYAMAJI KENSUKE
    • G03G15/20
    • PROBLEM TO BE SOLVED: To provide a fixing device of simple configuration that restricts an endless belt skew by a method without using a belt skew restricting member.SOLUTION: A fixing device has a pressure member 31 that forms a pressing area 41 disposed in firm contact with a pressure rotor 21 from the inner circumferential side of an endless belt 11. In the pressing area 41, the endless belt 11 and pressure rotor 21 conveys a recording medium P while sandwiching it between them. A pressing member 31 is fixed to a support member 51, and an endless belt 11 slides over the pressing member 31. A fixing area 42 is made narrower than the pressing area 41 formed by the pressing member 31, and an area where the pressure rotor 21 does not sandwich the endless belt 11 is located at the end of the pressing area 41. The rotating speed at which the endless belt 11 is rotated following the pressure rotor 21 at the end of the pressure area 41 is made lower than that in almost all areas other than the pressing area 41. The endless belt 11 obtains from the pressure rotor 21 rotation drive force sufficient for slide friction resistance acting on the pressing member 31 side face of it during the rotation thereof.
    • 要解决的问题:提供一种简单结构的定影装置,其通过不使用带歪斜限制构件的方法限制环形带歪斜。解决方案:定影装置具有压力构件31,压力构件31形成紧密配合的按压区域41 具有来自环形带11的内周侧的压力转子21.在按压区域41中,环形带11和压力转子21将记录介质P夹在它们之间。 按压部件31固定在支撑部件51上,环形带11在按压部件31上滑动。固定区域42比由按压部件31形成的按压区域41窄, 21不夹住环形带11位于按压区域41的端部。环形带11在压力区域41的端部处的压力转子21之后旋转的转速比几乎 除了按压区域41之外的所有区域。环形带11在其旋转期间从压力转子21获得足够的作用于其按压构件31侧面上的滑动摩擦阻力的旋转驱动力。
    • 8. 发明专利
    • Fixing device and image forming apparatus
    • 固定装置和图像形成装置
    • JP2013186197A
    • 2013-09-19
    • JP2012049633
    • 2012-03-06
    • Ricoh Co Ltd株式会社リコー
    • SUZUKI AKIRATAKAGI HIROTADAYOSHIKAWA MASAAKIISHII KENJIOGAWA SADAFUMIKAWADA TEPPEIYOSHIURA ARINOBUIWATANI NAOKIYAMAGUCHI YOSHINORIIMADA TAKAHIROGOTO SOSHIMOKAWA TOSHIHIKOYAMAJI KENSUKEARAI YUJI
    • G03G15/20
    • PROBLEM TO BE SOLVED: To provide a fixing device improving separability of a recording medium without reducing a radius of curvature of an endless belt.SOLUTION: A fixing device includes an endless belt 11, a pressure rotation body 21 and a pressure member 31 in pressure contact with the pressure rotation body 21 from an inner peripheral side of the endless belt 11 to form a fixing nip 41 and conveys a paper sheet P by holding the paper sheet P by the endless belt 11 and the pressure rotation body 21 at the fixing nip 41. A portion 31a projecting to the pressure rotation body 21 side from a conveyance position of the paper sheet P at the fixing nip 41 is provided at a portion away from a rear end of the fixing nip 41 of the endless belt 11 to a downstream side in a conveyance direction of the paper sheet P. The magnitude of restoring force of the paper sheet P for separating the paper sheet P becomes larger than restoring force acting on paper sheets P which are continuously conveyed without being separated from the endless belt 11 when a distance from a near belt center of the endless belt 11 is constant in the longitudinal direction by the portion 31a. Accordingly, separability of the paper sheet P from the endless belt 11 is improved.
    • 要解决的问题:提供一种改善记录介质的分离性而不减小环形带的曲率半径的定影装置。解决方案:一种定影装置包括环形带11,压力旋转体21和压力压力构件31 与环形带11的内周侧与压力旋转体21接触以形成定影辊隙41,并且通过在定影辊隙处通过环形带11和压力旋转体21保持纸张P来输送纸张P. 在环形带11的定影辊隙41的后端远离下游侧的部分设置有从定影辊隙41处的纸张P的输送位置向压力旋转体21侧突出的部分31a 在纸张P的输送方向的一侧。用于分离纸张P的纸张P的恢复力的大小变得大于作用在连续传送的纸张P上的恢复力w 当距环形带11的近皮带中心的距离在纵向方向上由部分31a保持一定距离时,不会与环形带11分离。 因此,纸张P与环形带11的分离性提高。