Image forming apparatus
AssigneesKabushiki Kaisha Toshiba, Toshiba Tec Kabushiki Kaisha
InventorEmiko Matsuoka
Life of this patent
Estimating the term…
Abstract
It is an object of the present invention to provide an image forming apparatus that enables effective utilization of a sheet. The image forming apparatus includes a sheet conveying path that conveys a sheet from a paper feeding tray to a secondary transfer position, an image transfer unit that transfers an image onto the sheet conveyed to the secondary transfer position via the sheet conveying path, a detection sensor that optically acquires information concerning a dirty spot on the sheet in a detection position located further on an upstream side than the secondary transfer position in the sheet conveying path, and a CPU that determines, on the basis of the information acquired by the detection sensor, whether a dirty spot is present in a predetermined region of the sheet.
Claims9
An image forming apparatus comprising:
- a sheet conveying path configured to convey a sheet from a paper feeding tray to a transfer position;
- an image transfer unit configured to transfer an image onto the sheet conveyed to the transfer position via the sheet conveying path;
- a dirty-spot-information acquiring unit configured to optically acquire information concerning a dirty spot on the sheet in a detection position located further on an upstream side in a conveying direction than the transfer position in the sheet conveying path;
- and
- a determining unit configured to determine, on the basis of the information acquired by the dirty-spot-information acquiring unit, whether a dirty spot is present in a predetermine region of the sheet.
An image forming apparatus comprising:
- a sheet conveying path configured to convey a sheet between a paper feeding tray and a transfer position;
- an image transfer unit configured to transfer an image onto the sheet conveyed to the transfer position via the sheet conveying path;
- a density-information acquiring unit configured to optically acquire information concerning density of the sheet in a detection position located further on an upstream side in a conveying direction than the transfer position in the sheet conveying path;
- and
- a determining unit configured to determine, on the basis of the information acquired by the density-information acquiring unit, whether the density of the sheet exceeds a predetermined value.
A sheet determining method in an image forming apparatus including a sheet conveying path configured to convey a sheet between a paper feeding tray and a transfer position, and an image transfer unit configured to transfer an image onto the sheet conveyed to the transfer position via the sheet conveying path, the sheet determining method comprising:
- optically acquiring information concerning density of the sheet in a detection position located further on an upstream side in a conveying direction than the transfer position in the sheet conveying path;
- and
- determining, on the basis of the acquired information, whether the density of the sheet exceeds a predetermined value.
Dependencies are inferred from the claim text.