Method and an apparatus for marking faults on rapidly moving material webs

Claim 1

An apparatus for marking faults on rapidly moving material web, or for sorting out faulty pieces of material, the apparatus comprising: a fault detection scanning device for cyclically scanning a web transverse to its longitudinal direction to detect potential faults and generate potential fault signals; a memory for storing fault signals and corresponding web coordinates; a marking or sorting device provided at a defined distance from the fault detection scanning device for making an appropriate mark on the web, or for sorting out an appropriate part of the web; a fault signal analyzer means connected to the fault detection scanning device for storing the potential fault signals, and for examining the potential fault signals independently of the speed of the web, to establish whether the potential fault signals are true fault signals or structure signals, and for then delivering the true fault signals which are found and the corresponding web coordinates to the fault signal memory, which stores the true fault signals and corresponding web coordinates, likewise independently of the speed of advance of the web; a comparator connected to the fault signal memory; and a longitudinal coordinate counter connected to the comparator; said comparator being operative for checking at short time intervals whether a true fault signal is present in the fault signal memory corresponding to each longitudinal coordinate, which said comparator receives from the longitudinal coordinate counter at the moment the part of the web having the corresponding longitudinal coordinate moves past the marking or sorting device and for transmitting marking or sorting signal to the marking or sorting device when a true fault signal corresponding to the longitudinal coordinate received from the longitudinal coordinate counter is present in the fault signal memory, said marking or sorting device being operatively connected to said comparator for making an appropriate mark on the web, or sorting out an appropriate part of the web, in response to the marking or sorting signal from said comparator.

Claim 2

An apparatus for marking faults on rapidly moving material web, or for sorting out faulty pieces of material, the apparatus comprising: a fault detection scanning device for cyclically scanning a web transverse to its longitudinal direction to detect potential faults and generate potential fault signals; a memory for storing fault signals and corresponding web coordinates; a marking or sorting device provided at a defined distance from the fault detection scanning device for making an appropriate mark on the web, or for sorting out an appropriate part of the web; a fault signal analyzer means connected to the fault detection scanning device for storing the potential fault signals, and for examining the potential fault signals independently of the speed of the web, to establish whether the potential fault signals are true fault signals or structure signals, and for then delivering the true fault signals which are found and the corresponding web coordinates to the fault signal memory, which stores the true fault signals and corresponding web coordinates, likewise independently of the speed of advance of the web; a comparator connected to the fault signal memory; and a longitudinal coordinate counter connected to the comparator; said comparator being operative for checking at short time intervals whether a true fault signal is present in the fault signal memory corresponding to each longitudinal coordinate, which said comparator receives from the longitudinal coordinate counter at the moment the part of the web having the corresponding longitudinal coordinate moves past the marking or sorting device and for transmitting marking or sorting signal to the marking or sorting device when a true fault signal corresponding to the longitudinal coordinate received from the longitudinal coordinate counter is present in the fault signal memory, said marking or sorting device being operatively connected to said comparator for making an appropriate mark on the web, or sorting out an appropriate part of the web, in response to the marking or sorting signal from said comparator.

Claim 6

A method for marking faults on rapidly moving material webs, or for sorting out faulty pieces of material, using a marking or sorting device, comprising the steps of: cyclically scanning a web transverse to its longitudinal direction to about potential faults and generate potential fault signals; storing the potential fault signals and corresponding web coordinates; examining the stored potential fault signals, independently of the speed of the web, to establish whether the potential fault signals are true fault signals or structure signals; storing the true fault signals and the corresponding web coordinates; checking, at short time intervals, to determine whether there is a stored true fault signal having a longitudinal coordinate corresponding to the longitudinal coordinate of the part of the web passing the marking or sorting device; transmitting a marking or sorting signal to the marking or sorting device upon finding a stored true fault signal having a longitudinal coordinate corresponding to the part of the web passing the marking or sorting device; and making an appropriate mark on the web, or sorting out an appropriate part of the web, in response to the marking or sorting signal.

Claim 7

A method for marking faults on rapidly moving material webs, or for sorting out faulty pieces of material, using a marking or sorting device, comprising the steps of: cyclically scanning a web transverse to its longitudinal direction to about potential faults and generate potential fault signals; storing the potential fault signals and corresponding web coordinates; examining the stored potential fault signals, independently of the speed of the web, to establish whether the potential fault signals are true fault signals or structure signals; storing the true fault signals and the corresponding web coordinates; checking, at short time intervals, to determine whether there is a stored true fault signal having a longitudinal coordinate corresponding to the longitudinal coordinate of the part of the web passing the marking or sorting device; transmitting a marking or sorting signal to the marking or sorting device upon finding a stored true fault signal having a longitudinal coordinate corresponding to the part of the web passing the marking or sorting device; and making an appropriate mark on the web, or sorting out an appropriate part of the web, in response to the marking or sorting signal.