Patent ID: 8185038
Filing Date: 2012-05-22
Classification: B65H,G03G

Abstract:
1. A curl correction device that corrects curl, comprising: 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 roll 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 roll with driving force for pressing the curl correction shaft according to a position of the cam, wherein the cam mechanism comprises: a cam shaft that is supported by the first supporting member, that is extended in parallel with the curl correction shaft, that is rotated in response to driving force when the curl correction roll is in the closed state, around a rotation axis along a direction in which the cam shaft is extended, and that has 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 in the closed state, the cam shaft remaining together with the curl correction shaft without being rotated together with the curl correction roll while the curl correction roll is rotated between the closed state and the open state; a connecting member that is pivotally supported by the first supporting member at a position corresponding to the first end of the curl correction roll in the closed state, and that receives, from the first rotation cam, driving force corresponding to rotation angle of the cam shaft around the rotation axis when the curl correction roll is in the closed state, the connecting member remaining together with the curl correction shaft without being rotated together with the curl correction roll while the curl correction roll is rotated between the closed state and the open state; 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 around the rotation axis via the connecting member when the curl correction roll is in the closed state, the first cam receiving member being rotated together with the curl correction roll while the curl correction roll is rotated between the closed state and the open state; 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 around the rotation axis when the curl correction roll is in the closed state, the second cam receiving member being rotated together with the curl correction roll while the curl correction roll is rotated between the closed state and the open state.