JP2009031613A5 - - Google Patents

Claims (6)

A belt member that rotates around a plurality of support rotating bodies; and
Cleaning means for cleaning the toner adhering to the belt member by rubbing against the belt member in a region where the length in the axial direction of the support rotating body is shorter than the belt member;
Steering means for moving the rotating belt member in the axial direction;
Detecting means for detecting the position of the belt member in the axial direction;
The belt member that rotates so that the cleaning unit cleans a portion of the belt member in the axial direction by controlling the steering unit based on the detection result of the detection unit during image formation. An image forming apparatus comprising: a first control unit configured to move in the axial direction;
At the time of non-image formation, the steering means is controlled so that the belt member reaches the outer position in the axial direction of the movement range at the time of image formation, and moves between both the outer positions in the axial direction. An image forming apparatus comprising a second control unit.   2. The image according to claim 1, wherein the second control unit controls the steering unit to move the belt member in the axial direction at a faster moving speed in the axial direction than during image formation. Forming equipment. The second control means controls the steering means to rotate the belt member at one or more rounds in a state where the belt member has reached the outer position for both the outer positions. Item 3. The image forming apparatus according to Item 2. The detecting means detects an edge of the belt member at two positions corresponding to a moving range and the outer position during the image formation,
4. The image forming apparatus according to claim 1, wherein the second control unit controls the steering unit based on a detection result of the detection unit corresponding to the outer position. 5.   5. The first control unit according to claim 1, wherein the second control unit interrupts image formation when a predetermined number of images are formed, and moves the belt member between both the outer positions. The image forming apparatus according to Item. The belt member is an intermediate transfer belt that carries a primary transferred toner image and overlaps a recording material at a secondary transfer portion,
6. The second control means according to claim 1, wherein the intermediate transfer belt is moved between both the outer positions in a return operation after jamming of the recording material. Image forming apparatus.