Apparatus for detecting flaws in an elongated moving strand

Abstract

Abstract APPARATUS FOR DETECTING FLAWS IN AN ELONGATED MOVING STRAND COMPRISING A PLURALITY OF PAIRS OF OPPOSITELY DISPOSED ROLLERS THROUGH WHICH THE STRAND MOVES. A FIRST ROLLER OF EACH PAIR HAS ATTACHED THERETO AND MOVABLE THEREWITH A COIL AND A SECOND ROLLER OF EACH PAIR HAS ATTACHED THERETO AND MOVABLE THEREWITH A PERMANENT MAGNET CORE. THE PERMANENT MAGNET CORE OF THE SECOND ROLLER IS POSITIONED INSIDE THE COIL OF THE FIRST ROLLER. WHEN A FLAW IN THE STRAND IS DETECTED BY EITHER OF THE ROLLERS THE PERMANENT MAGNET CORE MOVES RELATIVE TO THE COIL AND A VOLTAGE IS IN DUCED IN THE COIL. AN ELECTRICAL TACHOMETER MEASURES THE SPEED OF MOVEMENT OF THE STRAND. THE OUTPUT FROM THE TACHOMETER IS A VOLTAGE OUTPUT. THE VOLTAGE OUTPUT FROM THE TOILS ASSOCIATED WITH EACH PAIR OF ROLLERS IS COMPARED WITH THE VOLTAGE OUTPUT FROM THE TACHOMETER IN OPERATIONAL AMPLIFIER MEANS. IF THE VOLTAGE OUTPUT FROM A COIL IS GREATER THAN THE VOLTAGE OUTPUT FROM THE TACHOMETER A SIGNAL FROM THE OPERATIONAL AMPLIFIER MEANS OPERATES A FLIP-FLOP CIRCUIT WHICH IN TURN OPENS A CIRCUIT BREAKER WHICH SHUTS DOWN THE MACHINE WHICH IS MOVING THE STRAND. AFTER THE FLAW IN THE STRAND IS CORRECTED, A SIGNAL IS INJECTED INTO THE FLIP-FLOP TO RESTART NORMAL OPERATION AND THE CIRCUIT BREAKER IS CLOSED AND THE MACHINE AGAIN STARTS THE STRAND MOVING THROUGH THE PAIRS OF ROLLERS.

Inventors

• 👤 James O Seymour Jr
• 👤 Handrick B F Agterhuis

Bibliographic Details