Apparatus for severing paper webs or the like

Cutting – Cutting motion of tool has component in direction of moving... – Orbital motion of cutting blade

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83345, A24C 558

Patent

active

043344496

ABSTRACT:
An apparatus which subdivides an adhesive-coated web of paper or imitation cork into a succession of uniting bands which are draped around groups of coaxial cigarettes and filter plugs to form filter cigarettes has two drums rotating in opposite directions about parallel axes. One of the drums is a suction drum and serves to advance the leader of the web toward the nip of the two drums where the leader is severed to yield successive uniting bands. The suction drum has a number of equidistant axially parallel peripheral grooves each disposed in front of a cutting edge. The other drum carries detachable knives with cutting edges extending beyond the periphery of the other drum so that they can penetrate into the oncoming grooves during travel past the nip. The drums are rotated by mating gears and the radius of the cylinder which is formed by the cutting edges of the knives exceeds the radius of the pitch circle of the gear which drives the other drum. The cutting edges of the suction drum form a cylinder with a radius which is equal to or somewhat smaller than the radius of the pitch circle of the gear serving to drive the suction drum. The cutting edges of the knives define epicycloidal paths during travel toward, during penetration into and during withdrawal from the corresponding grooves. Those portions of the paths which are disposed in the respective grooves resemble loops with zeniths located in the interior of the grooves or at the entrances to such grooves. This ensures that expansion or contraction of the drums cannot result in clashing of the cooperating cutting edges.

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