Image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorKoji Suzuki
Life of this patent
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Abstract
An image forming apparatus includes an image forming portion, a heating portion, a discharging portion, a cooling portion, and a controller. A toner amount per predetermined sheet area of a toner image formed on a sheet is a toner image density. When a first toner image in which a region where the toner image density is a predetermined first density or more is absent is formed on the sheet, the controller executes an operation in a first mode. When a second toner image in which the region is present is formed on the sheet, the controller executes an operation in a second mode higher in cooling power than the first mode irrespective of a toner amount of the second toner image over entirety of the sheet.
Claims13
An image forming apparatus comprising:
- an image forming portion configured to form a toner image on a sheet;
- a heating portion configured to heat the toner image formed by said image forming portion;
- a discharging portion configured to discharge the sheet passed through said heating portion;
- a cooling portion configured to cool the sheet heated by said heating portion;
- and
- a controller capable of causing said cooling portion to operate in either of a plurality of modes including a first mode and a second mode higher in cooling power than the first mode,
- wherein when a first toner image in which a region where a toner image density is a predetermined first density or more is absent is formed on the sheet, said controller executes an operation in the first mode, wherein the toner image density is a toner amount per predetermined sheet area of the toner image formed on the sheet by said image forming portion, and
- wherein when a second toner image in which the region is present is formed on the sheet, said controller executes an operation in the second mode irrespective of a toner amount of the second toner image over entirety of the sheet.
An image forming apparatus comprising:
- an image forming portion configured to form a toner image on a sheet;
- a heating portion configured to heat the toner image formed by said image forming portion;
- a discharging portion configured to discharge the sheet passed through said heating portion;
- a cooling portion configured to cool the sheet heated by said heating portion;
- and
- a controller capable of causing said cooling portion to operate in either of a plurality of modes including a first mode and a second mode higher in cooling power than the first mode,
- wherein a region in which said image forming portion is capable of forming the toner image on the sheet is constituted by a plurality of regions, and
- wherein on the basis of image data corresponding to the toner image to be formed on the sheet by said image forming portion, said controller executes the operation in the first mode when said controller discriminates that a toner image density in each of all the regions is lower than the first density and executes the operation in the second mode when the controller discriminates that the toner image density in either one of the regions is the first density or more, and
- wherein the toner image density is a toner amount per unit area.
An image forming apparatus comprising:
- an image forming portion configured to form a toner image on a sheet;
- a heating portion configured to heat the toner image formed by said image forming portion;
- a discharging portion configured to discharge the sheet passed through said heating portion;
- a cooling portion configured to cool the sheet heated by said heating portion;
- an acquiring portion configured to acquire information on the toner image formed on the sheet;
- and
- a controller configured to control said cooling portion on the basis of the information acquired by said acquiring portion,
- wherein said controller executes an operation in a first mode when a first sheet on which a first toner image is formed is cooled by said cooling portion, and executes an operation in a second mode higher in cooling power than the first mode when a second sheet on which a second toner image is formed is cooled by said cooling portion,
- wherein an entire toner amount of the first toner image is more than an entire toner amount of the second toner image,
- wherein in the first toner image, a region where the toner image density is a first density or more is absent, and
- wherein in the second toner image, a region where the toner image density is the first density or more is present.
Dependencies are inferred from the claim text.