John Lysaght (australia) Limited

Bhp Steel (jla) Pty. Ltd.

Bruce R Morrison

Chris Baharis

James Arthur O'Neill

Peter James Ellis

Raymond Charles Osterberg

Damien Jinks

Richard Payling

John S Lake

Electro-magnetic plugging means for hot dip coating pot

A high resolution CCD video camera (6) is positioned and aligned with respect to an illuminated article (7) so that a straight edge of the article, or a straight line junction between a bright zone and a dark zone of its surface, crosses the field of view of the camera in a direction substantially parallel to the rows of the camera's orthogonal array of rows and columns of light responsive elements, to divide that field of view into bright and dark zones. A frame store and digitizer (9) converts the individual signals generated by the elements into digital grey values. The grey values derived from the elements of each row are summed by a computer (10) to produce a linear array of summation values positionally related to the respective columns, and the computer then determines the position of the edge or junction to a sub-column spacing accuracy by determining the mean value of two of the summation values selected respectively from a row receiving energy from the bright zone and one receiving energy from the dark zone and establishing a position in the array for the mean value, and thus for the feature, by interpolating the mean value between the two summation values immediately above and below it in magnitude.

Non-contact determination of the position of a rectilinear feature of an

An electromagnetic drag pad, particularly for providing all the drag force needed where slit ferrous strip is to be coiled at a coiling station, comprises a panel of drag friction material covering pole faces of an electromagnet which magnetically attracts the moving ferrous strip into frictional engagement with the panel of drag friction material thereby establishing a back tension to permit satisfactory formation of a stable coil of each strip at a coiling station; the electromagnet has a core comprising a multiplicity of elongated spaced apart substantially parallel pole elements defining therebetween gaps which accommodate an electric winding which is connected to a power supply (such as a low voltage DC high amperage supply) for energizing the electromagnet, the pole elements having respective pole faces which provide an alternating array of north and south poles. Typically, the pole elements extend transversely to the strip and these are of the order of 100 pole elements arranged in the array which extends of the order of 1 meter along the direction in which the strips move. The new form of electromagnet disclosed may have other applications.

Electromagnetic drag mechanisms for ferrous strip

Growing community of inventors

Jamberoo, Australia

Bruce R Morrison