| 摘要 |
Axial length of a center roller ( subroller ) 30 is sufficiently shortened than axial length of a main roller 28, and the center roller 30 is placed so that an axial of the center roller 30 is parallel to an axial of the main roller 28 in a base position and so that a nipping pressure is generated in the center position in the axial direction of the main roller 28. Therefore, a film (sheet) 20 is subjected to a tension in the center portion thereof due to the pulling force of the center roller 30, and therefore, the feeding amount of the film 20 at the left and right portions vary with each other. Then, the film 20 displaces in the axial direction of the main roller 28 around the center roller 30. <IMAGE> |
