Image forming apparatus
AssigneeToshiba Tec Kabushiki Kaisha
InventorHiroshi Ota
Life of this patent
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Abstract
According to an embodiment, an image forming apparatus measures a temperature of a pressing member and controls heat generation of a heater such that the measured temperature approaches a control temperature. Further, the image forming apparatus sets, before starting image formation of one job including image formation, one candidate temperature of a plurality of predetermined candidate temperatures different from each other as the control temperature on the basis of the number of sheets to be used and a sheet size to be used in the image formation of the one job.
Claims10
An image forming apparatus, which forms an image on a sheet and fixes the formed image onto the sheet to perform image formation, comprising:
- a heater that generates heat to heat the sheet over an entire region in a direction perpendicular to a conveyance direction of the sheet to fix the image onto the sheet conveyed after the image is formed on the sheet;
- a pressing member that applies a pressure for fixing to the sheet heated by the heater over the entire region in the direction perpendicular to the conveyance direction;
- a temperature sensor that measures a temperature of the pressing member or a temperature near the pressing member;
- a controller that controls heat generation of the heater such that the temperature measured by the temperature sensor approaches a control temperature;
- and
- a processor that
- determines whether or not a sheet to be used in image formation of one job including the image formation is a specified sheet in which a width in the direction perpendicular to the conveyance direction is narrower than a specified width,
- determines whether or not the one job is a large-volume job in which a number of sheets to be used is larger than a specified number of sheets if the sheet to be used is the specified sheet, and
- sets, before starting the image formation of the one job, one candidate temperature of a plurality of predetermined candidate temperatures different from each other as the control temperature and one candidate Copies Per Minute of a plurality of predetermined candidate Copies Per Minute different from each other as Copies Per Minute for an image forming,
- the Copies Per Minute for the image forming being a first candidate Copies Per Minute if the one job is the large-volume job, and a second candidate Copies Per Minute larger than the first candidate Copies Per Minute if the sheet to be used is not the specified sheet and if the one job is not the large-volume job.
An image forming apparatus, which forms an image on a sheet and fixes the formed image onto the sheet to perform image formation, comprising:
- a conveying device that conveys the sheet;
- a heater that generates heat to heat the sheet over an entire region in a direction perpendicular to a conveyance direction of the sheet to fix the image onto the sheet conveyed after the image is formed on the sheet;
- a pressing member that applies a pressure for fixing to the sheet heated by the heater over the entire region in the direction perpendicular to the conveyance direction;
- a temperature sensor that measures a temperature of the pressing member or a temperature near the pressing member;
- a controller that controls heat generation of the heater such that the temperature measured by the temperature sensor approaches a control temperature;
- and
- a processor that
- determines whether or not a sheet to be used in image formation of one job including the image formation is a specified sheet in which a width in the direction perpendicular to the conveyance direction is narrower than a specified width,
- determines whether or not the one job is a large-volume job in which a number of sheets to be used is larger than a specified number of sheets if the sheet to be used is the specified sheet, and
- sets, before starting the image formation of the one job, one candidate temperature of a plurality of predetermined candidate temperatures different from each other as the control temperature and controls the conveying device.
Dependencies are inferred from the claim text.