Patent ID: 6195867
Filing Date: 2001-03-06
Classification: B21D,F16J,Y10T

Abstract:
A method of producing a spiral wound gasket, wherein a tip portion of a hoop material having a chevron or wave shaped section is stopped by connecting it to a core drum for winding the hoop material, comprising the steps of:forming a checking stepped-portion by cutting and raising a chevron portion of the tip portion of the hoop material or a valley portion thereof;rotating the core drum in a state wherein the checking stepped-portion of the hoop material is caught by a checking pawl which makes a tip portion thereof protrude from the outer periphery of the core drum, thereby winding the hoop material around the outer periphery of the core drum at least once;overlapping the filler material onto the hoop material together so that both the hoop material and the filer material are wound in a spiral state; andretracting the checking pawl from the outer periphery of the core drum into the inner periphery of the core drum at a predetermined time after winding the hoop material around the outer periphery of the core drum at least once, thereby separating the checking pawl from the checking stepped-portion.