| 摘要 |
PURPOSE:To perform correction so that the edge position of a web is received within a tolerant limit and the hunching generated during the running of the web is set to the min., by determining control quantity R on the basis of the measured value Xn due to a measuring means and the estimated correction quantity C0 from an estimated control quantity setting means and controlling a posture to stabilize the running of the web. CONSTITUTION:In a position measuring part, the edge position of a running web is measured at every pulse (ta) cycle by a line sensor, a buffer memory, a data selector and CPU to calculate the displacement quantity to a set position X0. In an estimated control quantity setting part, each displacement quantity at every (ta) cycle is compared with a threshold value ¦Xs¦ and a displacement vector pattern Vp being the synthetic vector of the displacement quantity from the set position X0 and a time (t). Estimated correction quantity C0 is read from an estimation table memory and Xn-C0 is set to control quantity R to control a posture in the guide roller shaft direction of a web guide apparatus with respect to the advance direction of the running web at every (ta) cycle. The edge position of the web is stabilized toward an objective value X0 by this control and directed to a converging direction. |
