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US 2002/0057933 A1Published application
Image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorsShunichi Ebihara, Yoshiro Saito
Life of this patent
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Abstract
An image forming apparatus includes an image bearing body bearing a toner image thereon, transferring blade for transferring the toner image on the image bearing body to a transferring material, and charging roller having a voltage applied thereto to thereby charge the transferring material before the transfer by the transferring blade. The voltage applied to the charging roller is controlled on the basis of a current produced when the leading edge portion of the transferring material is charged by the charging roller.
Claims34
An image forming apparatus comprising:
- an image bearing body bearing a toner image thereon;
- transferring means for transferring the toner image on said image bearing body to a transferring material;
- and
- charging means for charging the transferring material by applying a voltage before said transferring by the transferring means;
- wherein the voltage applied to said charging means is controlled on the basis of a current produced when the leading edge portion of the transferring material is charged by said charging means.
2 more elements
An image forming apparatus comprising:
- an image bearing body bearing a toner image thereon;
- transferring means for transferring the toner image on said image bearing body to a transferring material by applying a voltage in a transferring part;
- charging means for charging the transferring material before the transfer by said transferring means;
- and
- detecting means for detecting a current produced when a voltage is applied to said charging means;
- wherein the voltage applied to said transferring means when the image-formed portion of the transferring material passes said transferring part is controlled on the basis of a current produced by a predetermined voltage being applied to said transferring means when the leading edge portion of the transferring material passes said transferring part, and said predetermined voltage is controlled on the basis of the output from said detecting means.
3 more elements
An image forming apparatus comprising:
- an image bearing body bearing a toner image thereon;
- transferring means for transferring the toner image on said image bearing body to a transfer material by applying a voltage in a transferring part;
- charging means for charging the transferring material before the transfer by said transferring means;
- and
- detecting means for detecting a voltage produced when a current is applied to said charging means;
- wherein the voltage applied to said transferring means when the image-formed portion of the transferring material passes said transferring part is controlled on the basis of a current produced by a predetermined voltage being applied to said transferring means when the leading edge portion of the transferring material passes said transferring part, and said predetermined voltage is controlled on the basis of the output from said detecting means.
3 more elements
An image forming apparatus comprising:
- an image bearing body bearing a toner image thereon;
- a transferring material bearing body bearing a transferring material thereon;
- transferring means for transferring the toner image on said image bearing body to the transferring material borne on said transferring material bearing body;
- charging means having a voltage for charging the transferring material borne on said transferring material bearing body by applying a voltage in a charging part before said transferring by the transferring means;
- and
- detecting means for detecting a current produced when a voltage is applied to said transferring material bearing body on which said transferring material is not borne;
- wherein the voltage applied to said charging means when the transferring material passes said charging means is controlled on the basis of the output from said detecting means.
4 more elements
An image forming apparatus comprising:
- an image bearing body bearing a toner image thereon;
- a transferring material bearing body bearing a transferring material thereon;
- transferring means for transferring the toner image on said image bearing body to the transferring material borne on said transferring material bearing body;
- charging means for charging the transferring material borne on said transferring material bearing body by applying a voltage in a charging part before said transferring by the transferring means;
- and
- detecting means for detecting a voltage produced when a current is applied to said transferring material bearing body on which said transferring material is not borne;
- wherein the voltage applied to said charging means when the transferring material passes said charging part is controlled on the basis of the output from said detecting means.
4 more elements
An image forming apparatus comprising:
- an image bearing body bearing a toner image thereon;
- transferring means, by applying a voltage, for transferring the toner image on said image bearing body to a transferring material being conveyed in a transferring part;
- and
- charging means for charging the transferring material by applying a voltage in a charging part before the transfer by said transferring means;
- wherein when in the conveying direction of the transferring material, the length of the transferring material is greater than the distance from said charging part to said transferring part, the voltage applied to said transferring means is changed over at timing whereat the trailing edge portion of the transferring material passes said charging part.
2 more elements
Dependencies are inferred from the claim text.