摘要:
A recording medium having a toner image formed thereon is moved to pass through a press contact portion between an endless belt being heated and an pressure roller pressed against the endless belt. When passing through the press contact portion, the toner image is fused and permanently affixed onto the recording medium. An oil application width O of an oil application roller is shorter than belt width B of the endless belt, and a maximum passing width P of a recording medium that may be supplied for the image formation, but is longer than a maximum image-forming width I within which an image may be formed on the recording medium.
摘要:
A heating device suitable for use as a fixing means for fixing a toner image onto a recording medium in, e.g., an electrophotographic image forming apparatus is provided so as to provide images free from image blurring or fixing failure while improving the anti-offset performance. The heating device includes a heating member, and a heat-resistant film having a first surface to be moved relative to and in contact with the heating member and a second surface to be in contact with a member to be heated, so that the member to be heated and the heat-resistant film are moved together over the heating member to heat the member to be heated. The heat-resistant film comprises at least a base layer and an elastic layer, wherein the elastic layer contains a filler exhibiting a thermal conductivity of at least 0.04 cal/cm.sec.°C.
摘要:
In a seamless film belt comprising a lamination of at least two layers, a modulus of elasticity of the outermost layer is established to be larger than that of the innermost layer. With this constitution, the seamless film belt which scarcely expands and scarcely develops cracks can be provided. When this is used in an electrophotography apparatus as an intermediate transfer belt, a high precision and uniform image can be obtained stably for a long period of time.
摘要:
A toner image fixing apparatus has a fixing roller, a pressing roller normally urged toward said fixing roller for pressing a sheet with an unfixed toner image carried on a surface thereof against said fixing roller to fix the unfixed toner image to said sheet when said sheet passes in one direction through a rolling contact region between said fixing roller and said pressing roller, a heating roller disposed on one side of said fixing roller opposite to said pressing roller, said heating roller having heating means disposed therein for heating said heating roller, an endless heat transfer belt trained around said heating roller and said fixing roller for transferring heat from said heating means to heat the unfixed toner image on said sheet when said sheet passes through said rolling contact region, and a standby mode temperature control circuit for maintaining temperatures of said fixing roller and said pressing roller in a predetermined temperature range in a standby mode.
摘要:
The present invention provides an image heating apparatus comprising a heater, a film sliding, and a back-up member. The heater includes a first heat-generating member for generating heat by electric power supply thereto, and a second heat-generating member, provided at the downstream side of the first heat-generating member with respect to the moving direction of the recording material, for generating heat by electric power supply thereto, and the first and second heat-generating members are so controlled that the ratio of the amounts of heat generation thereof varies depending on the presence or absence of the recording material in the nip.