Developer limiting part, developing apparatus, processing cartridge and image forming device
A technology for restricting components and developing devices, which is applied in the directions of developers, electrical recording processes applying charge patterns, equipment for electrical recording processes applying charge patterns, etc. To achieve the effect of increasing the overall rigidity, suppressing the temperature rise, and not easily deforming
Inactive Publication Date: 2007-05-30
RICOH KK
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Problems solved by technology
[0012] In the developing device disclosed in the aforementioned Japanese Patent Laid-Open No. 2001-235942, there is provided a heat sink in contact with the developer restricting member. Due to the thermal resistance of the two contact surfaces, the heat transfer from the developer restricting member to the radiator cannot be effectively performed. , there is a problem that the temperature rise of the developer in the above-mentioned developer restricting member cannot be effectively suppressed
[0013] In addition, in the developing device disclosed in the above-mentioned document, in order to make the temperature of the developer restricting member uniform in the longitudinal direction, a heat pipe is embedded in the above-mentioned heat sink, or a heat pipe is fixed on the developer restricting member, and there is no mechanism for suppressing the developer restricting member. Temperature rise function of the whole part
[0014] In the developing device disclosed in the aforementioned Japanese Patent Laid-Open No. 2001-083799, synthetic resin having a thermal conductivity lower than that of metal is used as the material of the sheet-shaped member constituting the developer restricting member. There is a problem that the temperature rise of the developer in the above-mentioned developer restricting member cannot be effectively suppressed because the sheet-shaped member constituting the developer restricting member is dissipated.
[0015] In addition, in the developing device disclosed in the above-mentioned document, it is disclosed that a thermally conductive layer and a protrusion made of a material having a higher thermal conductivity than synthetic resin are formed on the back surface of the above-mentioned sheet-shaped member. However, even this developer restricting member, Since the developer on the developer carrier is in direct contact with the synthetic resin, it is difficult to effectively suppress the temperature rise of the developer in the above-mentioned developer regulating member.
Method used
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[0131] In a reaction vessel equipped with a cooling tube, a stirrer and a nitrogen introduction tube, add 690 parts of bisphenol A ethylene oxide addition polymer 2 moles, 256 parts of terephthalic acid and polycondense for 8 hours at 230°C under normal pressure . After reacting for 5 hours under a high reduced pressure of 10-15 mmHg, it was cooled to 160° C., 18 parts of phthalic anhydride was added and reacted for 2 hours to obtain unmodified polyester resin (E).
[0132] Examples of prepolymer production:
[0133] In a reaction vessel equipped with a cooling tube, a stirrer and a nitrogen introduction tube, add 800 parts of bisphenol A ethylene oxide addition polymer of 2 moles, 180 parts of isophthalic acid, 60 parts of terephthalic acid, and two 2 parts of butyl tin oxide were reacted at 230°C under normal pressure for 8 hours, then dehydrated under reduced pressure of 10-15mmHg, and reacted for 5 hours. After cooling to 160°C, 32 parts of phthalic anhydride were added t...
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Provided is a developer regulating member which can efficiently suppress the temperature rise of a developer by heat generation in the regulating position of the developer regulating member, and to provide a developing device, a process cartridge, and an image forming apparatus. The developer regulating member 73 for regulating the developer on a developing sleeve 65 is formed of a single member having a hollow extending in a direction orthogonal with the moving direction on the surface of the developing sleeve 65 and consisting of metal. The member 73 is provided with a cooling means for cooling the member 73 from the hollow side in the member. A developer regulating section 73a facing at least the developing sleeve 65 of the member 73 is preferably formed by subjecting a plate member to bending.
Description
technical field [0001] The present invention relates to an image forming apparatus such as a copying machine, a printer, a facsimile machine, and a developer regulating member, a developing device, and a process cartridge used in the image forming apparatus. More specifically, it relates to a developer regulating member for regulating developer on a developer carrier, a developing device equipped with the developer regulating member, a process cartridge, and an image forming apparatus. Background technique [0002] Conventionally, as such a developing device, it is known that the developer is placed on a developer carrier such as a developing roller and conveyed to a developing area facing an image carrier such as a photoreceptor. In this developing device, the developer placed on the developer carrier is regulated by the developer regulating member, and then conveyed to the developing area. [0003] In a developing device using a two-component developer containing toner an...
Claims
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IPC IPC(8): G03G15/095G03G9/083G03G21/18G03G15/08
CPCG03G15/0812G03G2215/06
Inventor 堺清敬杉原和之寺井纯一须藤和久增田克己长岛弘恭木村秀树
Owner RICOH KK