| 摘要 |
PROBLEM TO BE SOLVED: To provide a system for conveying a sheet with a plurality of rollers, having a mechanism for controlling speed and tension of the sheet with high accuracy.SOLUTION: In a system for conveying a sheet by rotating first and second rollers arranged along a sheet conveyance path, an operation variable Us for a first motor which rotates the first roller and an operation variable Ud for a second motor which rotates the second roller are determined by: determining a speed Va of the sheet from rotation speeds V1 and V2 of the first and second rollers to calculate an operation variable Uv based on a deviation Ev between the sheet speed and a target speed Vr; determining tension Ra of the sheet Q from reactions R1 and R2 to be applied to the first and second rollers to calculate an operation variable Ur based on a deviation Er between the tension of the sheet and a target tension Rr; and calculating the operation variable Us as a sum (Uv+Ur) of the operation variable Uv and the operation variable Ur, and calculating the operation variable Ud as a difference (Uv-Ur) between the operation variable Uv and the operation variable Ur. |
