Automatic web threading apparatus & method

Details Automatic web threading apparatus & method Automatic web threading apparatus & method

B - Operations, Transporting

65

H

271/52

B65H 20/02 (2006.01) B65H 23/04 (2006.01) D21G 9/00 (2006.01)

Patent

CA 2011010

ABSTRACT OF THE DISCLOSURE A method and apparatus for automatically threading a traveling web strip, such as a so-called paper tail in a papermaking machine, utilizes a doctor for doctoring the web strip from the surface of a roll. A stream of compressed air is projected against the oncoming web strip in the vicinity of the point where the doctor blade contacts the web on the roll and urges the oncoming web off the roll surface upstream of the doctor. A foil is brought into proximity with the outer surface of the web spaced over the roll to urge the strip outwardly and against a serrated knife to sever the web strip against the force of its momentum. The severed end of the web strip is then guided onto a plate for conveyance into a downstream section of the machine for further processing.

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