EP1702730B1 - Cutting assembly for continuously cutting plastics material pipe lenghts - Google Patents

Cutting assembly for continuously cutting plastics material pipe lenghts Download PDF

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Publication number
EP1702730B1
EP1702730B1 EP05015284A EP05015284A EP1702730B1 EP 1702730 B1 EP1702730 B1 EP 1702730B1 EP 05015284 A EP05015284 A EP 05015284A EP 05015284 A EP05015284 A EP 05015284A EP 1702730 B1 EP1702730 B1 EP 1702730B1
Authority
EP
European Patent Office
Prior art keywords
cutting
cutting assembly
tubular element
assembly
gripping
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP05015284A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1702730A1 (en
Inventor
Achille Merlett Tecnoplastic S.p.a. Crugnola
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Merlett Tecnoplastic SpA
Original Assignee
Merlett Tecnoplastic SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Merlett Tecnoplastic SpA filed Critical Merlett Tecnoplastic SpA
Publication of EP1702730A1 publication Critical patent/EP1702730A1/en
Application granted granted Critical
Publication of EP1702730B1 publication Critical patent/EP1702730B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D3/00—Cutting work characterised by the nature of the cut made; Apparatus therefor
    • B26D3/16—Cutting rods or tubes transversely
    • B26D3/164—Cutting rods or tubes transversely characterised by means for supporting the tube from the inside
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/56—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which travels with the work otherwise than in the direction of the cut, i.e. flying cutter
    • B26D1/60—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which travels with the work otherwise than in the direction of the cut, i.e. flying cutter and is mounted on a movable carriage

Definitions

  • the present invention relates to a cutting assembly for continuously cutting plastics material pipe lengths according to the preamble of claim 1, an example of such a cutting assembly is given in US-A-5 868 718 .
  • This operation is performed to hold the tube or pipe in an inflated condition and to assure a constant size and, moreover, to apply outer layers, metal or plastic coils, and the like.
  • the tubes or pipes to be sold in lengths are subjected to a subsequent cutting operation by using very expensive automatic cutters.
  • the tube or pipe which is made in a coil arrangement and successively cut into pipe lengths, is frequently affected by a great ovalization, due to the fact that the tubular material is wound up as it is in a still hot condition.
  • the requirement of providing pressurized air inside said pipe does not allow to perform an exchange between a pipe length and a following pipe length, with a high frequency, since, in conventional methods, the tube would be inflated and a comparatively high amount of defective tubular material would be produced.
  • the aim of the present invention is to overcome the above mentioned problem, by providing a cutting assembly for continuously cutting plastics material tube lengths, which allows to provide preset length tubes, while holding a constant pressure inside the tube, to achieve an optimum production yield.
  • a main object of the present invention is to provide such a cutting assembly allowing to make pipe or tube lengths which can be cut with a high frequency and which are provided in a ready for packaging condition.
  • Another object of the present invention is to provide such a cutting assembly which, owing to its specifically designed characteristics, is very reliable and safe in operation.
  • Another object of the present invention is to provide such a cutting assembly which is very simple construction wise and which, moreover, is very competitive from a mere economic standpoint.
  • a cutting assembly for continuously cutting plastics material tube lengths, comprising the features of claim 1.
  • the cutting assembly for continuously cutting plastics material tube or pipe lengths which has been generally indicated by the reference number 1, comprises a bearing framework 2, which is arranged near an extruding head, therefrom exits a plastics material tubular element, which can be either flexible, half-rigid, or rigid.
  • a main feature of the present invention is that on the cutting framework are provided a first and second cutting units, which are respectively indicated by the reference numbers 3 and 4.
  • Each cutting unit comprises gripping means for gripping a tubular element 5 being extruded, said gripping means comprising a gripper element 10, the jaws of which define a slanted surface 11, thereon operates a clamping element 12, including wedge-like surfaces, which is driven by a first piston 13.
  • a slider 20 is associated or coupled, said slider supporting a cutting blade 21 having a throughgoing hole 22 which is driven by the first piston 13 as a cutting operation is to be performed.
  • a nozzle 30 is supported, said nozzle being arranged at said hole 22 and being driven by a second piston 31 to be engaged inside said tube or pipe 5 after having performed the cutting operation.
  • first and second cutting units which operate alternately to engage with the tubular element, after having cut it, and to be driven therewith to the desired length.
  • a switching element 40 displaces the tubular element 5 to arrange it at the other cutting unit, which is arranged at the start portion.
  • the first piston 13 drives the slider 20, therewith is rigid the blade 21 including the throughgoing hole 22.
  • the cutting blade will present, at the hole of the cut tubular element, the throughgoing hole 22 of said blade.
  • the second piston 31 will operate, with a very high speed, the air inlet nozzle 30 for supplying air inside the cut tubular element.
  • the overall cutting unit can start to slide along an operating track defined on the bearing framework 2 to pass from the operating starting position, where the cutting operation is performed, to an end of cycle position, entraining with it the pipe as evenly inflated by pressurized air.
  • the other cutting unit which is identical to the first cutting unit, will return to the operating cycle starting position, to be set for the following cutting operation.
  • the first cutting unit Upon receiving an electric command, the first cutting unit will be stopped at an end of cycle position and will discharge the tube.
  • the switching element 40 will bring the tube at the second cutting unit.
  • the second cutting unit in particular, will cut through the tube in a precisely identical manner to the above disclosed operation.
  • the first cutting unit causes the gripper to be opened, thereby discharging the tube length which is collected in a collecting region.
  • the operating cycle will start again and the first cutting unit will return to the cycle start position, whereas the second cutting unit will be driven with the cut through pipe or tube.
  • the tubular element will be always held in a pressurized condition, owing to a quick exchanging between the first and second cutting assemblies or units.
  • the invention provides a cutting assembly having a very high production yield, which allows to make tubes and the tube lengths with an accurate size or gauge precision, since pressurized air is always held inside the tubular element.
  • Another important aspect of the invention is that it is possible to continuously control the product and its size, with a further advantage of fully eliminating the ovalization of the made tube lengths and the bending of the tube material deriving from the fact that it is collected into a roll.
  • the used materials, as well as the contingent size and shapes can be any, depending on requirements.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Details Of Cutting Devices (AREA)
EP05015284A 2005-03-18 2005-07-14 Cutting assembly for continuously cutting plastics material pipe lenghts Not-in-force EP1702730B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000453A ITMI20050453A1 (it) 2005-03-18 2005-03-18 Gruppo di taglio in continuo di spezzoni di tubo in materia plastica

Publications (2)

Publication Number Publication Date
EP1702730A1 EP1702730A1 (en) 2006-09-20
EP1702730B1 true EP1702730B1 (en) 2008-09-10

Family

ID=36480909

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05015284A Not-in-force EP1702730B1 (en) 2005-03-18 2005-07-14 Cutting assembly for continuously cutting plastics material pipe lenghts

Country Status (6)

Country Link
EP (1) EP1702730B1 (it)
AT (1) ATE407774T1 (it)
DE (1) DE602005009655D1 (it)
DK (1) DK1702730T3 (it)
ES (1) ES2314524T3 (it)
IT (1) ITMI20050453A1 (it)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4941378A (en) * 1988-10-24 1990-07-17 General Motors Corporation Method and apparatus for rapid repetitive cutting
US5614136A (en) * 1995-03-02 1997-03-25 Scimed Life Systems, Inc. Process to form dimensionally variable tubular members for use in catheter procedures
DE19520161C1 (de) * 1995-06-01 1996-10-17 Bellaform Extrusionstech Gmbh Vorrichtung zum Ablängen oder Schlitzen von kontinuierlich bewegtem, strangförmigem Material
US5725814A (en) * 1995-06-07 1998-03-10 Harrel, Inc. Extrusion of an article of varying content
DE10229081B4 (de) * 2002-06-28 2007-07-19 Contitech Luftfedersysteme Gmbh Verfahren zum Trennen von Schläuchen und Vorrichtung zur Durchführung des Verfahrens

Also Published As

Publication number Publication date
DE602005009655D1 (de) 2008-10-23
EP1702730A1 (en) 2006-09-20
ATE407774T1 (de) 2008-09-15
ITMI20050453A1 (it) 2006-09-19
ES2314524T3 (es) 2009-03-16
DK1702730T3 (da) 2009-01-19

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