Belt skew correcting device, belt device, and image forming apparatus

An image forming apparatus comprising a belt skew correcting device that corrects a skew of an endless belt which is supported by a plurality of rollers and which is driven to rotate around the plurality of rollers, the device including:

• a following member that follows a movement of the endless belt along a rotational shaft of one of the plurality of rollers and also follows a rotational movement of the endless belt around the rotational shaft;
• a dislocating member that is configured integrally with the following member in order to follow the movement of the endless belt along the rotational shaft and not to follow the rotational movement of the endless belt around the rotational shaft;
• and
• a guide member that guides the dislocating member, wherein
• the dislocating member has a cylindrical shape, a part of which is cut off diagonally so that the dislocating member has an inclined sectional surface,
• the guide member has a cylindrical shape, a part of which is cut off diagonally so that the guide member has an inclined sectional surface to abut slidably on the inclined sectional surface of the dislocating member,
• an angle of the inclined sectional surface of the dislocating member with respect to the rotational shaft is the same as an angle of the inclined sectional surface of the guide member with respect to the rotational shaft, and
• the inclined sectional surface of the dislocating member is guided by the inclined sectional surface of the guide member in accordance with a following movement of the following member, so that the rotational shaft is given a tilt corresponding to an amount of the movement of the endless belt along the rotational shaft, and thereby the one roller can be tiled.