Apparatus for severing running webs of tipping paper or the like

摘要

Apparatus for severing the running web of tipping paper in a filter tipping machine has a rotary anvil whose cylindrical peripheral surface is contacted by the running web, a rotary carrier which is adjacent to and defines with the anvil a nip for the running web, a knife which is movably mounted in the carrier and has an elongated cutting edge which cooperates with the web-contacting portion of the peripheral surface of the anvil to sever the web once during each revolution of the carrier, and a system of springs which bias the knife axially of the carrier so as to prevent movements of the knife under the action of centrifugal force and/or gravity but to allow the knife to move its cutting edge into a position in which the entire cutting edge contacts the peripheral surface of the anvil upon completion of the first cut. This reduces noise which is generated when the apparatus is in use. The springs can bear directly against the knife and/or carrier, or they may stress suitable slide blocks which frictionally engage the end portions of the knife or the adjacent sections of the carrier. Noise can be reduced still further by the provision of resilient elements and bearings which prevent radial and/or axial wobbling of the shafts for the anvil and knife carrier with respect to the housing of the tipping machine.