# US 5,217,724 A · Apparatus for the in-line cropping and/or chamfering of a plastic tube > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,217,724 A - Document ID: US5217724A - Status: Granted - Kind: A - Application number: 07/851,249 - Filed: 1992-03-13 - Granted: 1993-06-08 - Earliest claimed: 1989-11-01 - Assignees: Wavin B.V. - Inventors: Egbert Lenters - Web page: https://patentgrep.com/patent/US5217724A ## CPC - B26D 3/16: Cutting rods or tubes transversely {(cutting tubes longitudinally B26D3/001)} - B23D 21/04: Tube-severing machines with rotating tool-carrier - Y10T 82/16262: Infeed cam disk rotation geared to tool holder rotation - Y10T 82/16311: Scroll plate infeed cam - B26D: CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING (for growing crops or plants A01D, A01G; for fodder or straw A01F; for bulk butter A01J; for dough A21C; slaughtering A22B; for tobacco, cigars or cigarettes A24; marking-out, perforating or making buttonholes A41H25/00; manufacturing footwear A43D; brushmaking A46D; surgery A61B; disintegrating, mincing or shredding in general B02C; cutting wire, making pins or nails B21F, B21G; of the kind used formetal B23; cutting by abrasive fluid jets B24C5/02; hand-held cutting tools B26B; perforating, cutting-out, stamping-out or punching, or severing by means other than cutting B26F; for wood B27; for stone B28D; working of plastics or substances in a plastic state B29; making boxes, cartons, envelopes or bags, of paper or similarly worked materials, e.g. metal foil, B31B; article or web delivery apparatus incorporating cutting or line-perforating devices B65H35/00; for leather or upholstery B68, C14B; for glass C03B; making matches C06F; for peat C10F; for sugar C13B45/00; for textile materials D06H; civil engineering, building, mining, see Section E; for light guides G02B6/25; cutting processed photographic material G03D15/04) - B23D: PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR (making toothed gears or the like B23F; cutting metal by applying heat locally B23K; arrangements for copying or controlling B23Q) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract An apparatus for in-line cropping and/or chamfering of a plastic tube. The apparatus includes pressure rollers for deforming a tube section and cutting devices to perform the cropping and/or chamfering operation. The control of movement of the pressure rollers and cutting devices is carried out by a combination of a face cam and a rotor disc; the face cam and rotor disc have the same diameter and may be given rotary speeds which are related to each other in any desired way. Control is carried out preferably by use of an interference box. ## Claims ### Claim 1 Apparatus for in-line cropping and chamfering operations using at least one cutting device, of a plastic tube moulded by extrusion, which apparatus is adapted to be sited in an extrusion line for the continuous moulding of said plastic tube, said apparatus comprising means for positioning a tube section with respect to said at least one cutting device, at least one deforming roller associated with each cutting device on either side thereof for deforming the tube section on which the cropping and chamfering operations are to be carried out, and a rotatable combination of a coaxially mounted rotor disc and a face cam, said face cam having a groove comprised of a plurality of levels and said rotor disc having a plurality of cam-follower rollers engaged in the face cam groove levels, wherein movement of the cam-follower rollers in the face cam groove levels controls movement of the deforming rollers and the at least one cutting device in carrying out the cropping and chamfering operations, and wherein the rotor disc and the face cam have the same circumferential dimension, the apparatus further comprising a planetary gear box for varying the rotary speed of one of the rotor disc and the face cam, said planetary gear box having the capacity to match the rotary speed of said rotor disc and said face cam to each other. ### Claim 2 (depends on 1) Apparatus according to claim 1, in which said planetary gear box acts on the rotary speed of the face cam. ### Claim 3 (depends on 1) Apparatus according to claim 1, in which the face cam groove is subdivided into a number of identical separate groove segments. ### Claim 4 (depends on 2) Apparatus according to claim 2, in which the face cam groove is subdivided into a number of identical separate groove segments. ### Claim 5 (depends on 3) Apparatus according to claim 3, in which the number of identical segments equals the number of cutting devices. ### Claim 6 (depends on 1) Apparatus according to claim 1, which further comprises a reset device which in the event of stoppage of the extrusion line or of a section thereof, provides for the return, at least prior to restarting the extrusion line, of said at least one cutting device and the deforming rollers to an initial position.