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US 2002/0164172 A1Published application
Toner image fixing device
AssigneeSharp Kabushiki Kaisha
InventorsYoritaka Tsubaki, Atsushi Ide
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AssigneeSharp Kabushiki Kaisha
InventorsYoritaka Tsubaki, Atsushi Ide
Estimating the term…
Disclosed is a toner image fixing device that is capable of changeably setting sheet separating portions in contact with or apart from the cylindrical surfaces of corresponding fixing rollers in accord with the resiliency of recording material to surely prevent a recording material from wrapping round the fixing rollers and being jammed between the rollers and capable of minimizing the frequency of contacting the separating portions with the fixing roller surfaces to obtain an increased quality of a toner image fixed on the recording material and elongate the service life of the fixing rollers. This toner image fixing device is provided with upper and lower fixing rollers, upper and lower separating portions changeably set in positions apart from the cylindrical surfaces of the corresponding fixing rollers and in positions contacting with the surfaces of the corresponding rollers to separate a recording material P from the roller surfaces, upper and lower driving portions for driving the corresponding separating portions into their contacting or detached positions, a humidity sensor for detecting the humidity, a recording material identifying device for identifying the kind of the recording material and a separating portion control portion for controlling the separating portion driving portions based on at least either one of the humidity sensed by the humidity sensor and the kind of the recording material determined by the material identifying device.
A toner image fixing device provided with a sheet separating portion for separating a recording material from a cylindrical surface of a fixing roller, the portion capable of changing its position from a contacting position in which it is in contact with the surface of the fixing roller to a detached position in which it is apart from the surface of the fixing roller and vice versa,
A toner image fixing device for fixing by heating a toner image formed on a recording material passing through a nip between paired fixing rollers, wherein it is provided with paired sheet separating portions, each portion being capable of changing its position from a contacting position in which it is in contact with a cylindrical surface of the corresponding fixing roller for separating the recording material from the roller surface, to a detached position being apart from the surface of the fixing roller and vice verse,
Atoner image fixing device as defined in claim 2, wherein the control means controls the portion driving means to turn the sheet separating portions into the detached positions in which they are apart from the corresponding fixing roller surfaces on condition that the kind of the recording material is discriminated as a paper sheet thicker than a normal paper sheet by the recording material identifying means and the humidity determined by the humidity sensing means is lower than a normal humidity value.
Dependencies are inferred from the claim text.