System and apparatus for controlling the unwinding of coiled material

Claim 1

A method for controlling the unwinding of a coil of coiled material in a rolling line or in a process line, when coiled material loaded on a mandrel is to be unwound comprising the steps of: (a) continuously measuring the number of turns of the coil to derive a first signal indicating the remaining number of turns of coil wound on said mandrel as said mandrel is unwinding; (b) continuously producing a second signal indicating the speed of said material; (c) continuously producing a third signal by calculating the number of turns of the material wound on said coil at the moment when deceleration is to be initiated based on said second signal; (d) continuously comparing said first and third signals; and (e) producing a deceleration instruction when said third signal is less than or equal to said first signal.

Claim 2

A method for controlling the unwinding of a coil of coiled material in a rolling line or in a process line, when coiled material loaded on a mandrel is to be unwound comprising the steps of: (a) continuously measuring the number of turns of the coil to derive a first signal indicating the remaining number of turns of coil wound on said mandrel as said mandrel is unwinding; (b) continuously producing a second signal indicating the speed of said material; (c) continuously producing a third signal by calculating the number of turns of the material wound on said coil at the moment when deceleration is to be initiated based on said second signal; (d) continuously comparing said first and third signals; and (e) producing a deceleration instruction when said third signal is less than or equal to said first signal.

Claim 4

An apparatus for controlling the unwinding of coiled material comprising: (a) a mandrel on which a web-like material is wound in the form of a coil; (b) a counter for presetting an initial number of turns of a coil and subtracting the number of turns from said initial number of turns in accordance with the rotation of said mandrel when said coil is unwound; (c) a first calculation circuit for calculating the desired remaining amount of coil LR at a moment when the deceleration is to be initiated from the actual speed V of the web-like material unwound from said mandrel, the set deceleration factor α, the desired speed Vo of the web-like material when the deceleration is finished and the desired remaining amount Ld of coil when the deceleration is finished; (d) a second calculation circuit for calculating the number of revolutions Ns of said mandrel corresponding to the output LR derived from said first calculation circuit; and (e) a comparator for comparing the output of said counter with the output of said second calculation circuit, and releasing deceleration instructions at the deceleration factor α to said mandrel when said both outputs are in coincidence with each other.

Claim 5

An apparatus for controlling the unwinding of coiled material comprising: (a) a mandrel on which a web-like material is wound in the form of a coil; (b) a counter for presetting an initial number of turns of a coil and subtracting the number of turns from said initial number of turns in accordance with the rotation of said mandrel when said coil is unwound; (c) a first calculation circuit for calculating the desired remaining amount of coil LR at a moment when the deceleration is to be initiated from the actual speed V of the web-like material unwound from said mandrel, the set deceleration factor α, the desired speed Vo of the web-like material when the deceleration is finished and the desired remaining amount Ld of coil when the deceleration is finished; (d) a second calculation circuit for calculating the number of revolutions Ns of said mandrel corresponding to the output LR derived from said first calculation circuit; and (e) a comparator for comparing the output of said counter with the output of said second calculation circuit, and releasing deceleration instructions at the deceleration factor α to said mandrel when said both outputs are in coincidence with each other.