Method for monitoring the width of material in strip form

Claim 1

A method for monitoring the width of material in strip form, with an image evaluation device consisting of a television camera which generates analog signals corresponding to a picture of the edges of the material, a digitizing unit which converts the analog video signals into digital signals, and a memory for storing the digital signals comprising the steps of: shifting the picture of a sample edge in two opposite directions to define two tolerance limits; storing the tolerance limits; comparing the images of each of successive recorded actual edges of the material with the tolerance limits; and generating an indication signal indicative of the position of the actual edges with respect to the tolerance limits.

Claim 2

A method for monitoring the width of material in strip form, with an image evaluation device consisting of a television camera which generates analog signals corresponding to a picture of the edges of the material, a digitizing unit which converts the analog video signals into digital signals, and a memory for storing the digital signals comprising the steps of: shifting the picture of a sample edge in two opposite directions to define two tolerance limits; storing the tolerance limits; comparing the images of each of successive recorded actual edges of the material with the tolerance limits; and generating an indication signal indicative of the position of the actual edges with respect to the tolerance limits.

Claim 7

A method for controlling the width of a glass melt used for the manufacture of plate glass with an image evaluator device consisting of a television camera which generates analog signals corresponding to edges of said glass melt, a digitizing unit which converts said analog signals into digital signals and a memory for storing the digital signals comprising the steps of: generating first analog signals corresponding to a sample edge of known width; shifting said first analog signals in a first and second direction to generate first and second corresponding tolerance limits; digitizing and storing said tolerance limits; generating second analog signals corresponding to edges of a glass melt; digitizing said second analog signals to obtain sample digital signals; comparing said sample digital signals to said tolerance limits; generating an indication signal related to the positions of said sample signals to said tolerance limit; and changing the position of said glass melt with respect to said tolerance limits in response to said indication signal.

Claim 8

A method for controlling the width of a glass melt used for the manufacture of plate glass with an image evaluator device consisting of a television camera which generates analog signals corresponding to edges of said glass melt, a digitizing unit which converts said analog signals into digital signals and a memory for storing the digital signals comprising the steps of: generating first analog signals corresponding to a sample edge of known width; shifting said first analog signals in a first and second direction to generate first and second corresponding tolerance limits; digitizing and storing said tolerance limits; generating second analog signals corresponding to edges of a glass melt; digitizing said second analog signals to obtain sample digital signals; comparing said sample digital signals to said tolerance limits; generating an indication signal related to the positions of said sample signals to said tolerance limit; and changing the position of said glass melt with respect to said tolerance limits in response to said indication signal.