Image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorYusuke Ishida
Life of this patent
Estimating the term…
Abstract
An image forming apparatus including an exposure device, a development device, an image density detection device, a supply device for supplying a toner to the development device, a cleaning device for cleaning the surface of an image bearing member, a driving torque detection device for detecting a driving torque of the image bearing member, and a controller which drives the image bearing member while providing a predetermined electric potential difference between a region charged in the image bearing member and a developer support in case of non-image formation conducts a driving torque detecting operation with respect to the image bearing member by means of the driving torque detection device, and changes a reference value in response to the value of the driving torque detected.
Claims12
An image forming apparatus, comprising:
- an image bearing member on which an electrostatic image is formed;
- a development device which allows a developer containing a toner and a carrier to be supported on a developer support, whereby the electrostatic image is developed to form a toner image;
- an image density detection device which detects a density of the image formed with the toner;
- a supply device which supplies the toner to the development device based on a result of detection by the image density detection device;
- a cleaning device provided in contact with the image bearing member to clean a surface of the image bearing member;
- a driving device which drives the image bearing member;
- a driving torque detection device which detects a driving torque in a case of driving the image bearing member;
- and
- a controller which controls a toner density of the developer in the development device by the supply device in response to a value of the driving torque so as to suppress a transition of the carrier to the image bearing member.
An image forming apparatus, comprising:
- an image bearing member on which an electrostatic image is formed;
- a development device which allows a developer containing a toner and a carrier to be supported on a developer support, whereby the electrostatic image is developed to form a toner image;
- a toner density detection device which detects a toner density of the developer in the development device;
- a supply device which supplies the toner to the development device based on a result of detection by the toner density detection device;
- a cleaning device provided in contact with the image bearing member to clean a surface of the image bearing member;
- a driving device which drives the image bearing member;
- a driving torque detection device which detects a driving torque in a case of driving the image bearing member;
- and
- a controller which controls the toner density of the developer in the development device by the supply device in response to a value of the driving torque so as to suppress a transition of the carrier to the image bearing member.
An image forming apparatus, comprising:
- a charging device which charges an image bearing member;
- an exposure device which exposes a region charged in the image bearing member being charged by the charging device to form an electrostatic image;
- a development device which allows a developer containing a toner and a carrier to be supported on a developer support, and which provides an electric potential difference between the developer support and the electrostatic image, whereby the electrostatic image is developed to form a toner image;
- a cleaning device provided in contact with the image bearing member to clean a surface of the image bearing member;
- a driving device which drives the image bearing member;
- a driving torque detection device which detects a driving torque in a case of driving the image bearing member;
- and
- a controller which drives the image bearing member while providing a predetermined electric potential difference between the region charged in the image bearing member and the developer support in case of non-image formation, conducts a driving torque detecting operation with respect to the image bearing member by the driving torque detection device, and changes the electric potential difference between the region charged in the image bearing member and the developer support in a case of image formation in response to a value of the driving torque so as to suppress a transition of the carrier to the image bearing member.
Dependencies are inferred from the claim text.