Method and apparatus for effecting a clipped tail in a traveling paper web

Claim 1

A method for automatically producing a clipped tail in a traveling tail of a web as the tail is supported on a co-traveling roll support surface, and to lift and deflect the traveling tail from the roll surface, the tail having spaced, parallel outer edges, comprising the steps of: 1) positioning a doctor over the traveling roll surface from a at a doctor ready position at a location outside of one of the edges of the tail, the doctor having a blade with a leading edge; 2) positioning the nozzle of a water jet in a nozzle ready position at a predetermined location upstream of the doctor blade, relative to the direction of tail travel, and outside of the said one edge of the tail over the roll surface, said doctor and said water jet nozzle both being mounted and fixedly located relative to one another on a platform, said platform being mounted on a transport apparatus for reciprocal traversing movement in a direction parallel with the axis of rotation of the roll between ready and threading positions relative to the roll support surface; 3) engaging the traveling roll surface with the leading edge of the doctor blade, at its ready position outside of the said one of the edges of the tail; 4) impinging a web-severing water stream against the roll support surface at a location on the tail or laterally outside the said one edge of the tail and upstream of the leading edge of the doctor blade; 5) traversing the water jet and doctor blade together on the platform in the predetermined locations relative to each other over the width of the tail transversely of the direction of tail travel to intercept the tail, so as to automatically sever the tail with the water stream to produce a clipped tail, and to simultaneously lift and deflect the traveling clipped tail with the doctor blade away from the supporting roll surface; 6) deactivating the water jet to stop the water stream from being emitted from the water jet nozzle; and 7) disengaging the doctor from web tail deflection engagement.

Claim 2

A method for automatically producing a clipped tail in a traveling tail of a web as the tail is supported on a co-traveling roll support surface, and to lift and deflect the traveling tail from the roll surface, the tail having spaced, parallel outer edges, comprising the steps of: 1) positioning a doctor over the traveling roll surface from a at a doctor ready position at a location outside of one of the edges of the tail, the doctor having a blade with a leading edge; 2) positioning the nozzle of a water jet in a nozzle ready position at a predetermined location upstream of the doctor blade, relative to the direction of tail travel, and outside of the said one edge of the tail over the roll surface, said doctor and said water jet nozzle both being mounted and fixedly located relative to one another on a platform, said platform being mounted on a transport apparatus for reciprocal traversing movement in a direction parallel with the axis of rotation of the roll between ready and threading positions relative to the roll support surface; 3) engaging the traveling roll surface with the leading edge of the doctor blade, at its ready position outside of the said one of the edges of the tail; 4) impinging a web-severing water stream against the roll support surface at a location on the tail or laterally outside the said one edge of the tail and upstream of the leading edge of the doctor blade; 5) traversing the water jet and doctor blade together on the platform in the predetermined locations relative to each other over the width of the tail transversely of the direction of tail travel to intercept the tail, so as to automatically sever the tail with the water stream to produce a clipped tail, and to simultaneously lift and deflect the traveling clipped tail with the doctor blade away from the supporting roll surface; 6) deactivating the water jet to stop the water stream from being emitted from the water jet nozzle; and 7) disengaging the doctor from web tail deflection engagement.