Image forming apparatus and control method for driving the same

Image forming apparatus and control method for driving the same

  • CN 101,004,573 B
  • Filed: 01/17/2007
  • Issued: 02/22/2012
  • Est. Priority Date: 01/17/2006
  • Status: Active Grant
First Claim
Patent Images

1. imaging device, it comprises:

  • First image carrier and second image carrier, it is arranged in and is used for forming predetermined color images;

    By the transfer belt that driven roller and driven rolls support, transfer belt along the predetermined direction operation to transfer images on the print media, wherein, said image optionally be formed on first image carrier and second image carrier and be transferred and the transfer belt that is added on;

    First primary transfer roller, it is installed in the opposite side of first image carrier, and transfer belt is arranged between said first primary transfer roller and said first image carrier;

    Second primary transfer roller;

    It is installed in the opposite side of second image carrier movably;

    And transfer belt is arranged between said second primary transfer roller and said second image carrier;

    To come optionally to make transfer belt to engage through the orbit that optionally changes transfer belt or to separate with second image carrier with second image carrier;

    And when image be formed on first image carrier and second image carrier and be transferred and the transfer belt that is added on the time, said first primary transfer roller remains transfer belt and contacts with first image carrier;

    Driver element is used to drive second primary transfer roller, makes it optionally engage transfer belt or separates from transfer belt;

    AndThe belt length regulon, it has dancer rools, even be used for when the orbit of transfer belt is changed by second primary transfer roller, also preventing that the length of the transfer belt between first image carrier and the driven roller from changing, wherein through the position change of dancer rools;

    On transfer belt, form first predetermined color images through making first image carrier contact with transfer belt, this step comprises;

    in first of transfer belt is rotated, on transfer belt, form the image of first color;

    In second of transfer belt was rotated, the image of second color that superposes and first color was to form double-colored superimposed image;

    And in the 3rd of transfer belt was rotated, the 3rd color that superposes and double-colored superimposed image to be forming three look superimposed images,When image was formed on second image carrier, the position of said second primary transfer roller changed, and made transfer belt engage with second image carrier, andSaid driver element comprises;

    Swinging mounting is used to support the rotation of second primary transfer roller;

    Elastic component, the direction elasticity that is used for separating along second primary transfer roller from transfer belt spurs said swinging mounting;

    AndCam member is used for working together with swinging mounting, and said cam member engages said belt length regulon,Said driven roller with respect to first and second image carriers more near second image carrier.

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