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US 6,480,694 B2Granted
Oil application roller
AssigneeNichias Corporation
InventorsKohichi Kimura, Tatsuo Takagi, Masanori Ono, Munehiko Fukase, Takeshi Kuboyama
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AssigneeNichias Corporation
InventorsKohichi Kimura, Tatsuo Takagi, Masanori Ono, Munehiko Fukase, Takeshi Kuboyama
Estimating the term…
In an oil application roller having an oil retaining member made of a hollow cylindrical porous formed body provided with an oil application layer on the outer periphery and that supplies a fixing roll with lubricant oil retained in the oil retaining member, the porous formed body is made of an inorganic material having micro-diameter voids and pores inside, at least a part of the micro-diameter voids communicates with a surface of the porous formed body and the pores, and at least a part of the pores communicates with a surface of the porous formed body through the micro-diameter voids. Also, if permeability resistance is 100 to 6,000 Pa.s/m2, no oil leak occurs during transportation and storage, the amount of the lubricant oil supplied to the fixing roll can be controlled and a uniform amount of lubricant oil can be supplied despite its compact and simple structure, the utilization rate of the lubricant oil can be enhanced. Further, if a pressure buffer device is provided between the hollow portion and the atmosphere, ill effects from oil leak and thermal expansion can be prevented.
An oil application roller having an oil retaining member made of a hollow cylindrical porous formed body provided with an oil application layer on the outer periphery thereof and that supplies a fixing roll with lubricant oil retained in the oil retaining member, wherein the porous formed body is made of an inorganic material having micro-diameter voids and pores inside, at least a part of the micro-diameter voids communicates with a surface of the porous formed body and the pores, 40% or more of the entire volume of the micro-diameter voids are made up of small holes of a diameter ranging from 30 to 200 μm, at least a part of the pores communicates with a surface of the porous formed body through the micro-diameter voids, the average diameter of pores is greater than 200 and less than or equal to 2000 μm, and the total volume of the pores accounts for 5 to 30% of the porous formed body.
An oil application roller having an oil retaining member made of a hollow cylindrical porous formed body provided with an oil application layer on the outer periphery thereof and that supplies a fixing roll with lubricant oil retained in the oil retaining member, wherein the porous formed body is made of an inorganic material having micro-diameter voids and pores inside, at least a part of the micro-diameter voids communicates with a surface of the porous formed body and the pores, at least a part of the pores communicates with a surface of the porous formed body through the micro-diameter voids, and a differential pressure (P1-P2) between a pressure (P1) of a gaseous phase portion of the hollow portion and the atmospheric pressure (P2) ranges between −0.05 and −2.0 kPa in a state where the lubricant oil is retained in hollow portion.
Dependencies are inferred from the claim text.