Two roll web cutter and method
AssigneeElsner Engineering Works, Inc.
InventorsBertram F. Elsner, Robert E. Molison
Life of this patent
Estimating the term…
Abstract
A web cutter includes a knife roll located above an anvil roll, a web infeed conveyor for moving a continuous web to be severed to the nip between the rolls and a segment discharge conveyor for removing segments cut from the web. The roll includes a plurality of fixed cutting knives and the anvil roll includes a plurality of fixed anvils such that rotation of the rolls brings each knife into engagement with an anvil to sever the web. Lift plates on the anvil roll are located immediately upstream from each anvil to raise the severed lead end of the web above the anvil in order to assure proper feeding to the discharge conveyor.
Claims23
A web cutter including a knife roll having a cutting knife, an anvil roll including a rotary the body, a lift plate on the body upstream from the anvil, a plurality of grooves extending across a top of the lift plate in the direction of rotation, and lifting means for moving the plate from a retracted position located to one side of the anvil to an elevated position located radially above the anvil, the anvil roll being located adjacent the knife roll to define a nip between the rolls, a drive for rotating the knife roll and the anvil roll and moving the knife and anvil downstream so that said knife and anvil come into engagement at the nip to sever a web extending between the rolls, and a discharge guideplate located adjacent and immediately downstream from the nip, said guideplate including a plurality of fingers extending toward the nip and into said grooves as the elevated lift plate is rotated past the guideplate.
A method of severing a lead end of a continuously moving sticky web into a plurality of web segments comprising the steps of:
- a) moving a web through a nip between rotating anvil and knife rolls of a web cutter to cut successive segments from an end of the web and adhere ends of the segments and each successive lead end of web to the anvil roll;
- b) breaking each segment away from the anvil roll and moving each segment away from the nip;
- c) moving a plate on the anvil roll radially above the anvil roll immediately after forming each cut to strip each successive lead end of the web from the anvil roll and thereby lift each such end above the anvil roll;
- d) moving a lead edge of the plate on the anvil roll adjacent to a guideplate located downstream from the nip to define a web support surface extending away from the nip;
- and
- e) moving each of said elevated lead ends of the web along such surface and away from the web cutter.
A web cutter for severing segments from a lead end of a continuous web fed downstream through the cutter, the cutter comprising:
- a) a knife roll including a cutting knife;
- b) an anvil roll located adjacent the knife roll to define a nip between the rolls, an anvil on the anvil roll cooperable with the knife to sever a web extending through the nip between the rolls;
- c) a drive for rotating the rolls to bring the knife and anvil together at the nip and sever a web;
- d) a discharge guideplate located between the rolls downstream from the nip;
- e) a lift plate mounted on the anvil roll upstream from the anvil, the lift plate having a downstream edge, said plate being movable between a depressed position where said edge is located immediately upstream of the anvil and an elevated position where said edge is located radially above the anvil and immediately adjacent the discharge guideplate;
- and
- f) first means for locating the lift plate in the depressed position when the anvil is moved through the nip and the knife and anvil sever a web and for moving the lift plate from the depressed position to the elevated position immediately after the anvil is moved through the nip thereby stripping a newly severed lead end of a web from the anvil.
Dependencies are inferred from the claim text.