Separation charger control for electro-photographic apparatus
AssigneeMinolta Camera Kabushiki Kaisha
InventorTakanobu Yamada
Life of this patent
Estimating the term…
Abstract
A separation charger is acts on a transfer sheet after an image is transferred onto the sheet for a predetermined number of times at an ouput corresponding to the number of times the image is transferred onto the transfer sheet of a transfer drum. An image forming apparatus forms a high quality image by correcting the ouput of the transfer charger and seperation charger based on the humidity and type of copy sheet detected.
Claims9
An image forming apparatus, comprising:
- a photoconductor;
- means for forming a toner image on the photoconductor;
- an intermediate transfer member disposed opposite to the photoconductor for holding a sheet on its cicumferential surface;
- a transfer charger disposed opposite to the photoconductor through the intermediate transfer member for transferring a toner image from the photoconductor onto a sheet held on the intermediate transfer member;
- a separation charger disposed at a downstream side of the transfer charger in the rotational direction of the intermediate transfer member for separating the sheet from the intermediate transfer member;
- means for recognizing the number of times the toner image is transferred;
- and
- means for setting an output of the separation charger corresponding to the number of times the toner image is transferred.
A method of forming an image on a sheet by electrostatically transferring a toner image formed on an image holding member onto a sheet held by a transfer member, comprising the steps of:
- a) forming a toner image on the image holding member;
- b) electrostatically transferring the toner image onto a sheet on the transfer member;
- c) repeating steps a) and b) for a predetermined number of times for the same sheet;
- and
- d) removing electric charge on the transfer member by a charger, said charger output being varied based on the number of times steps a) and b) are repeated.
A method of forming a colored image on a sheet by electrostatically transferring a colored toner image formed on an image holding member onto a sheet held by a transfer member, comprising the steps of:
- a) forming a toner image on the image holding member by using a toner selected from yellow toner, magenta toner, cyan toner and black toner;
- b) electrostatically transferring the toner image onto the sheet on the transfer member;
- c) changing the color of the toner in step a);
- d) repeating states a) and b) for a predetermined number of times with respect to the same sheet;
- e) removing electric charge on the transfer member by a charger, said charger being varied based on the number of times steps a) and b) are repeated;
- and
- f) fixing the toner image onto the sheet after steps a)-e) are completed.
Dependencies are inferred from the claim text.