| 摘要 |
PROBLEM TO BE SOLVED: To provide a fixing device realizing the improvement of the separability of transfer material and the prolongation of the life of a roller. SOLUTION: In the fixing device, a fixing roller 2 is constituted by providing a silicone rubber layer 22 on a core bar and a PTFE layer 23 on the layer 22, and a pointed separation pawl 51 whose tip is a fine curved surface is disposed at a disposing angle (θ0) being 130 deg. to the roller 2 and its tip abuts on and enters the surface of the roller 2. The entering amountδof the tip of the pawl 51 is set to the size equal to or above the radius R and equal to or under the diameter of the circle of curvature passing on the curved surface of the tip. The crossing angleθ=90 deg. of the entering tip of the pawl 51 to the surface of the roller 2 is the entering amountδ= the radius of curvature R. At such a time, the transfer material 100 collides with the pawl 51 but the extreme edge of the transfer material is not perfectly sharp even in the case of the transfer material having sharp edge surface, so that the transfer material can be separated if the crossing angleθis an obtuse angle of >=90 deg.. |
