Curl correction device and image formnig apparatus

An image forming apparatus comprising:

• a sheet carrying unit that carries a sheet;
• an image forming unit that forms an image according to an image signal;
• a sheet heating unit that heats a sheet having an image formed by the image forming unit;
• a curl correction unit that corrects curl of the sheet after the sheet is heated by the sheet heating unit;
• and
• a housing that houses the sheet carrying unit, the image forming unit, the sheet heating unit, and the curl correction unit,
• wherein the curl correction unit has a curl correction assembly that is an integral unit, and the housing has a guiding member to pull out the curl correction assembly from the housing in a manner that the curl correction assembly can be housed,
• wherein the curl correction assembly comprises:
• a curl correction shaft that drives to carry a sheet;
• a first supporting member that supports the curl correction shaft;
• a curl correction roll that operates in closed state where the curl correction is disposed in parallel with the curl correction shaft, holds the sheet between the curl correction shaft and the curl correction roll and presses the sheet against the curl correction shaft;
• a second supporting member that supports the curl correction roll, and rotates the curl correction roll around the vicinity of a first end in the longitudinal direction of the curl correction roll between the closed state and open state in which a second end in the longitudinal direction of the curl correction roll is placed away from the curl correction shaft;
• and
• a cam mechanism that provides, via a cam, the curl correction shaft with driving force for pressing the curl correction roll according to a position of the cam,
• wherein the cam mechanism comprises:
• a cam shaft that is supported by the first supporting member, extended in parallel with the curl correction shaft, and rotated in response to driving force, the cam shaft having a first rotation cam and a second rotation cam fixed thereto at positions respectively corresponding to the first end and the second end of the curl correction roll;
• a connecting member that is pivotally supported by the first supporting member at a position corresponding a the first end of the curl correction roll, and that receives, from the first rotation cam, driving force corresponding to rotation angle of the cam shaft;
• a first cam receiving member that is fixed to the first end of the curl correction roll, and that receives, from the first rotation cam, driving force according to rotation angle of the cam shaft via the connecting member;
• and
• a second cam receiving member that is fixed to the second end of the curl correction roll, extending toward the second rotation cam, and receives from the second rotation cam driving force according to rotation angle of the cam shaft,
• wherein the curl correction assembly is housed in the housing in the direction in which the curl correction assembly is pulled out from the housing with the second end at a top.