JP2009025473A5 - - Google Patents

Claims (5)

An image carrier for carrying a charged toner image;
Toner image forming means for forming a toner image to be carried on the image carrier;
Transfer rotation in which an elastic layer is disposed around a rotating shaft supported at both ends, the center is formed thicker than both ends, and a transfer medium is sandwiched between the image carrier and a toner image transfer portion is formed. An image forming apparatus comprising: a body;
An adjustment mechanism capable of adjusting the contact length of the transfer portion in the rotation direction of the transfer rotator at the both ends and the center by changing the height of the both ends with respect to the image carrier;
An image comprising : control means capable of controlling the adjustment mechanism to adjust a density difference between the toner image transferred at both ends and the toner image transferred at the center. Forming equipment. Density detecting means for detecting the density of the toner image transferred at both ends and the density of the toner image transferred at the center;
The control unit controls the toner image forming unit under a predetermined condition to form a measurement toner image on the image carrier, and the density detection unit detects the measurement toner image and the adjustment mechanism. 2. The image forming apparatus according to claim 1, wherein after the operation is performed, the toner image forming unit is controlled again to form the measurement toner image on the image carrier . The adjustment mechanism can set the height in a plurality of stages,
When the start of adjustment of the density difference between the toner image transferred at both ends and the toner image transferred at the center is commanded, the measurement toner image is formed and recorded in all of the plurality of stages. 3. The image forming apparatus according to claim 2, wherein an image transferred and fixed on the material is output. A first transfer rotator as the transfer rotator for transferring a toner image to an intermediate transfer member as the transfer medium;
A first adjustment mechanism as the adjustment mechanism for adjusting the contact length of the first transfer rotator;
A second transfer rotator as the transfer rotator for transferring a toner image from the intermediate transfer member to a recording material as the transfer medium;
A second adjustment mechanism as the adjustment mechanism for adjusting the contact length of the second transfer rotator,
The density detection means detects the measurement toner image transferred to a recording material,
When the density difference is not reduced by the first adjustment mechanism, the first adjustment mechanism is returned to the initial state, and the second adjustment mechanism is operated to form the measurement toner image. The image forming apparatus according to claim 2 or 3. The adjustment mechanism is
A first support member that biases one end of the rotating shaft toward the image carrier through a spring member;
A second support member for urging the other end of the rotating shaft toward the image carrier through a spring member;
5. The image according to claim 1, further comprising: a cam mechanism that moves the first support member and the second support member in a linked state to a side in pressure contact with the image carrier. Forming equipment.