| 摘要 |
A method for controlling the on-the-fly splicing of a web wound on a first roll to a web wound on a second roll, wherein the first roll is being unwound and the second roll is set in rotation. The method comprises the steps of: transferring a roll carrier supporting the first and second roll from the unwind position to the pasting position, when the first roll reaches one of a first diameter and first circumference value; accelerating the second roll until its peripheral velocity is equal to the velocity of the unwinding web on the first roll, when the first roll reaches one of a second diameter and second circumference value; and operating a pasting and cutting means for pasting the web of the second roll beginning at the pasting tip of the web of the second roll, to the web running off the first roll and for cutting the web running off the first roll at the end of the pasting tab formed by the pasted section of the first and second rolls when the first roll reaches one of a third diameter and third circumference value. In accordance with the invention, the method further comprises the step of continuously calculating the aforesaid diameter or circumference values from a predetermined value for the end diameter of the first roll, a predetermined value for the length of the pasting tab, from one of predetermined and measured time constants of the mechanical members carrying out the method, and from the actual values for the velocity of the web of the first roll and for the rotation of the first roll. |
