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US 6,778,790 B2Granted
Fixing device capable of preventing excessive increase in temperature
AssigneeRicoh Company, Ltd.
InventorsHiroshi Yoshinaga, Motokazu Yasui, Masanao Ehara, Hideo Furukawa, Yukiko Iwasaki
Life of this patent
Estimating the term…
Abstract
A fixing device including a rotatable fixing member, a first heating device configured to heat the rotatable fixing member, a rotatable pressing member positioned in press-contact with the rotatable fixing member and forming a fixing region through which a sheet-like recording medium having an unfixed image thereon passes to fix the unfixed image by heat and pressure, and a controller configured to turn off the first heating device for a first predetermined time before a trailing edge of a last sheet-like recording medium in a series of a job passes through the fixing region.
Claims26
A fixing device comprising:
- a rotatable fixing member;
- a heating device configured to heat the rotatable fixing member,
- a rotatable pressing member positioned in press-contact with the rotatable fixing member and forming a fixing region through which a sheet-like recording medium passes to fix an unfixed image by heat and pressure;
- and
- a controller configured to turn off the heating device for a predetermined time before a trailing edge of a last sheet-like recording medium in a series of a job passes through the fixing region.
2 more elements
A fixing device comprising:
- a rotatable fixing member;
- a first heating device configured to heat the rotatable fixing member;
- a rotatable pressing member positioned in press-contact with the rotatable fixing member and forming a fixing region through which a sheet-like recording medium passes to fix an unfixed image by heat and pressure;
- a second heating device configured to heat the rotatable pressing member;
- a controller configured to turn off the first heating device for a first predetermined time before a trailing edge of a last sheet-like recording medium in a series of a job passes through the fixing region and turn off the second heating device for a second predetermined time before the trailing edge of the last sheet-like recording medium passes through the fixing region.
2 more elements
An image forming apparatus comprising:
- a photoreceptor configured to form a latent image thereon;
- and
- a fixing device including:
- a rotatable fixing member;
- a heating device configured to heat the rotatable fixing member;
- a rotatable pressing member positioned in press-contact with the rotatable fixing member and forming a fixing region through which a sheet-like recording medium passes to fix an unfixed image by heat and pressure;
- and
- a controller configured to turn off the heating device for a predetermined time before a trailing edge of a last sheet-like recording medium in a series of a job passes through the fixing region.
5 more elements
An image forming apparatus comprising:
- a photoreceptor configured to form a latent image thereon;
- and
- a fixing device including,
- a rotatable fixing member;
- a first heating device configured to heat the rotatable fixing member;
- a rotatable pressing member positioned in press-contact with the rotatable fixing member and forming a fixing region through which a sheet-like recording medium passes to fix an unfixed image by heat and pressure;
- a second heating device configured to heat the rotatable pressing member;
- and
- a controller configured to turn off the first heating device for a first predetermined time before a trailing edge of a last sheet-like recording medium in a series of a job passes through the fixing region and turn off the second heating device for a second predetermined time before the trailing edge of the last sheet-like recording medium passes through the fixing region.
6 more elements
A method of fixing an image, comprising:
- providing a rotatable fixing member and a rotatable pressing member;
- providing a heating device configured to heat the rotatable fixing member;
- press-contacting the rotatable pressing member with the rotatable fixing member to form a fixing region through which a sheet-like recording medium passes to fix an unfixed image by heat and pressure;
- and
- turning off the heating device for a predetermined time before a trailing edge of a last sheet-like recording medium in a series of a job passes through the fixing region.
2 more elements
A method of fixing an image, comprising:
- providing a rotatable fixing member and a rotatable pressing member;
- providing a first heating device configured to heat the rotatable fixing member;
- press-contacting the rotatable pressing member with the rotatable fixing member to form a fixing region through which a sheet-like recording medium passes to fix an unfixed image by heat and pressure;
- providing a second heating device configured to heat the rotatable pressing member;
- turning off the first heating device for a first predetermined time before a trailing edge of a last sheet-like recording medium in a series of a job passes through the fixing region;
- and
- turning off the second heating device for a second predetermined time before the trailing edge of the last sheet-like recording medium passes through the fixing region.
4 more elements
A fixing device comprising:
- a rotatable fixing member;
- heating means for heating the rotatable fixing member;
- and
- pressing means for pressing against the rotatable fixing member to form a fixing region through which a sheet-like recording medium passes to fix an unfixed image by heat and pressure;
- and
- controlling means for controlling the heating means such that the heating means is turned off for a predetermined time before a trailing edge of a last sheet-like recording medium in a series of a job passes through the fixing region.
3 more elements
A fixing device comprising:
- a rotatable fixing member;
- first heating means for heating the rotatable fixing member;
- pressing means for pressing against the rotatable fixing member to form a fixing region through which a sheet-like recording medium passes to fix an unfixed image by heat and pressure;
- second heating means for heating the pressing means;
- and
- controlling means for controlling the first heating means such that the first controlling means is turned off for a first predetermined time before a trailing edge of a last sheet-like recording medium in a series of a job passes through the fixing region and the second heating means such that the second heating means is turned off for a second predetermined time before the trailing edge of the last sheet-like recording medium passes through the fixing region.
3 more elements
Dependencies are inferred from the claim text.