Image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorsIsao Hayashi, Masaaki Naoi, Ichiro Okumura, Masaya Kobayashi, Hisae Shimizu
Life of this patent
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Abstract
A first position information formed on an conveyance body is read by an information detecting portion, and a second position information formed on a second image carrier is read by the information detecting portion. A control is made such that a position of an image on the second image carrier matches with a position of an image on the conveyance body from information read by the information detecting portion in transferring the image from the second image carrier to the conveyance body. The information detecting portion is held by a hold member and are disposed at a transfer region.
Claims21
An image forming apparatus, comprising:
- a conveyance body configured to carry and convey an image or recording medium;
- first and second image carriers juxtaposed in a conveying direction of the conveyance body and each carrying and conveying an image;
- a first image forming portion configured to form the image on the first image carrier;
- a second image forming portion configured to form the image on the second image carrier;
- a first transfer portion configured to transfer the image from the first image carrier to the conveyance body or to the recording medium conveyed by the conveyance body;
- a second transfer portion disposed downstream the first transfer portion in the conveying direction of the conveyance body and configured to transfer the image from the second image carrier to the conveyance body or to the recording medium conveyed by the conveyance body;
- a first position information forming portion configured to form first position information concerning a position of the image formed on the conveyance body by the first image forming portion;
- a second position information forming portion configured to form second position information concerning a position of the image formed on the second image carrier by the second image forming portion;
- an information detecting portion configured to detect the first position information formed on the conveyance body and the position information formed on the second image carrier;
- a control portion configured to control at least either one of the second image carrier, the second image forming portion, and the conveyance body such that the position of the image carried on the second image carrier matches with the position of the image transferred from the first image carrier to the conveyance body or the position of the image transferred from the first image carrier to the recording medium conveyed by the conveyance body on a basis of the first and second position information detected by the information detecting portion in transferring the image from the second image carrier to the conveyance body or to the recording medium conveyed by the conveyance body;
- and
- a hold member configured to hold and to position the information detecting portion at a transfer region where the image is transferred from the second image carrier to the conveyance body or to the recording medium.
Dependencies are inferred from the claim text.