Image forming apparatus
AssigneeKYOCERA Document Solutions Inc.
InventorAkihiro WATANABE
Life of this patent
Estimating the term…
Abstract
An image forming apparatus can perform a toner collection mode that includes a first positive rotation step in which at the time of no image formation, in a state where the second bias applied to a toner carrying member is set at a higher voltage on the same polarity side as a toner than a first bias, a developer carrying member and the toner carrying member are rotated in the same direction as a direction at the time of image formation and a reverse rotation step in which after the first positive rotation step is performed, in a state where the first bias is set at a higher voltage on the same polarity side as the toner than the second bias, the developer carrying member and the toner carrying member are rotated in a reverse direction to the direction at the time of image formation.
Claims7
An image forming apparatus comprising:
- an image carrying member on which an electrostatic latent image is formed;
- a development device which includes,
- a developer carrying member that carries, with a magnet incorporated, as a magnetic brush, on a surface, a two-component developer containing a toner and a magnetic carrier and that transports the carried magnetic brush by rotation,
- a toner carrying member that is arranged opposite the image carrying member and the developer carrying member, that carries, on a surface, the toner in the magnetic brush transported by the rotation of the developer carrying member and that supplies the carried toner to the image carrying member and
- a restriction member that is arranged a predetermined distance apart from the developer carrying member below the toner carrying member and that restricts a thickness of a layer of the developer on the surface of the developer carrying member and
- the electrostatic latent image formed on the surface of the image carrying member is developed into a toner image;
- a first voltage application portion which applies a first bias to the developer carrying member;
- a second voltage application portion which applies a second bias to the toner carrying member;
- and
- a control portion which controls voltages of the first voltage application portion and the second voltage application portion and drive and rotation of the developer carrying member and the toner carrying member,
- wherein the control portion can perform, at a time of no image formation, a toner collection mode that includes
- a first positive rotation step in which in a state where the second bias is set at a higher voltage on a same polarity side as the toner than the first bias, the developer carrying member and the toner carrying member are rotated in a same direction as a direction at a time of image formation and
- a reverse rotation step in which after the first positive rotation step is performed, in a state where the first bias is set at a higher voltage on the same polarity side as the toner than the second bias, the developer carrying member and the toner carrying member are rotated in a reverse direction to the direction at the time of image formation.
Dependencies are inferred from the claim text.