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
  • B26D5/00—Arrangements for operating and controlling machines or devices for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
  • B26D5/20—Arrangements for operating and controlling machines or devices for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting with interrelated action between the cutting member and work feed
• • 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
• • 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

Definitions

• the present invention relates to a method of cutting a tube in line, this tube being driven by a rotational movement on itself and by a movement of advance by axial translation, this method using at least one knife disposed in a cutting plane predetermined, this knife being driven simultaneously by a translation perpendicular to the advance of said tube in said cutting plane and by an axial translation synchronized with the advance of said tube to cut at least one section of tube.
• the present invention also relates to a cutting device implementing this method and comprising at least one knife arranged in a predetermined cutting plane, first means for driving the knife in radial translation perpendicular to the advance of said tube and second means knife drive in axial translation synchronized with the advance of said tube to cut at least one section of tube.
• the tubes concerned by this invention are mainly cardboard tubes, of all sizes, used as a winding support for example in the fields of stationery, textiles, metallurgy, etc. These tubes are generally manufactured continuously on a machine for winding paper strips commonly called a spiraling machine or mandrel. At the outlet of this machine, a cutting device is placed allowing the tube obtained to be cut into sections of predefined length.
• This cutting device usually comprises, and as described in the publications DE-U-8805316 and US-A- 4,591,405, two knives arranged on either side of the tube driven simultaneously by an advance movement in axial translation and by a rotational movement on itself, these knives comprising a rotary cutting blade.
• the present invention aims to overcome these drawbacks by proposing a method of cutting a tube in line which takes account of the thickness and hardness of the tube and which makes it possible to achieve a clean, quality cut, without affecting the cost of production, as well as a corresponding cutting device, reliable and suitable for all types of tubes.
• the invention relates to a cutting method of the kind indicated in the preamble, characterized in that the tube is cut in several successive stages by moving the knife in the direction of the tube, in a discontinuous manner, in steps of cutting, until at least the total thickness of the tube is reached, each cutting stage corresponding to a predetermined cutting depth.
• the number of cutting steps is determined as a function of at least one parameter characterizing the tube to be cut chosen from the group comprising at least its thickness, its hardness, its density, its diameter, and the control is controlled. cutting edge of the knife according to this parameter.
• each cutting stage is made in a half turn of the tube.
• At least two knives arranged in different cutting planes can be used to cut at least two sections of tube.
• the knife can be moved to a depth of cut less than the thickness of the tube to make a grooving or partial cutting of the tube.
• the invention relates to a cutting device of the kind indicated in the preamble, characterized in that the first drive means are arranged to move said knife in the direction of said tube in a discontinuous manner, by cutting steps until reaching at least the total thickness of the tube, each cutting stage corresponding to a predetermined cutting depth so as to cut the tube in several successive stages.
• this device includes servo means arranged to control the first drive means as a function of at least one parameter characterizing said tube to be cut chosen from the group comprising at least its thickness, its hardness, its density, its diameter, and for controlling the second drive means as a function at least of the speed of advance of the tube.
• control means can comprise at least one programmable control unit and the drive means can be chosen from the group comprising at least motors, stepper motors, servomotors, jacks, cam systems.
• this device comprises two knives arranged in the same cutting plane, in opposition on either side of the tube, and the first and second drive means are common to the two knives.
• It can comprise at least two knives arranged in different cutting planes for cutting at least two sections of tube or at least two pairs of knives, the knives of each pair being arranged in the same cutting plane, in opposition from both other from the tube.
• each knife is mounted on a carriage coupled to the first drive means, the whole being mounted on a mobile support coupled to the second drive means.
• the first drive means can be coupled to the carriages of the same pair of knives by a double nut - worm screw connection, the winding of the worms being opposite.
• the knife or knives are coupled to rotation drive means.
• FIG. 1 is a side view of a cutting device according to invention
• Figure 2 is an end view of the cutting device of Figure 1
• Figures 3A-D are detail views of the tube and knives illustrating the cutting progress.
• the cutting device 1 is generally positioned at the outlet of a machine for manufacturing tubes in line by winding strips of paper, commonly called a spiraling machine or mandrel, and allows the cutting of the tube 2 obtained in sections of predetermined length. It also allows grooving or partial cutting of the tube in addition to cutting as required.
• This cutting device 1 can also be supplied with tubes to be cut or grooved outside any production line or by any other machine.
• This cutting device 1 is fed by the tube 2 driven simultaneously by a rotational movement on itself and a forward movement by axial translation, these movements being generally generated by the tube manufacturing machine.
• the tube 2 is guided in translation in the cutting device 1 to the cutting zone. After the cutting zone, the sections of tube 2 are evacuated from the cutting device 1 by any known means of evacuation (not shown), such as a conveyor belt, a chute, etc. to a storage (not shown) or palletizing area.
• the tube 2 is guided in translation by external guides: top 20, bottom 21 and side 22, adjustable in position as a function of the diameter of the tube 2 by any known means. This guidance can be further supplemented by an internal mandrel (not shown).
• the tube 2 is represented by the smallest diameter and the largest admissible diameter on this cutting device 1.
• the forward movement of the tube 2 follows an axis coincident with the median plane A of the cutting device 1.
• Each knife 3 consists of a circular cutting blade 30, driven in rotation by a motor 31 and a transmission by sprockets 32 and chain 33. Other drive means are also possible and can be directly coupled to the circular blade 30 or by other means of transmission. In other embodiments not shown, the cutting blades are not motorized and are driven in rotation by the only rotation of the tube 2.
• the two knives 3 are diametrically opposed, one serving as a support for the other , to avoid offsetting the tube 2. If a single knife 3 is provided, it is then necessary to provide a counter support opposite, for example by means of a rotating roller.
• This cutting device 1 can also include several knives 3 or pairs of knives 3 arranged in separate cutting planes for cutting or not simultaneously several sections of tube 2, but also marking or grooving said tube 2.
• Each knife 3 is mounted on a carriage 34 movable in translation in said cutting plane B by first drive means 4.
• these first drive means 4 comprise a motor 40 coupled to a worm 41, for example with balls, by means of a transmission by pulleys 42 and belt 43, the worm 41 meshing a nut 44 secured to the carriage 34.
• These first drive means 4 are common to the two knives 3 since they cause a double worm screw 41 with reverse winding.
• Each carriage 34 is guided in translation by a raceway 35 provided on either side of the endless screw 41, between the carriage 34 and a support 50.
• other drive, transmission and guide may be suitable.
• the knife 3 of left is shown in two positions corresponding respectively to the two extreme sizes of the tube 2.
• the knife 3 on the right is only partially shown.
• the carriages 34 are mounted on a support 50 movable in axial translation by second drive means 5 synchronized with the advance of the tube 2.
• These second drive means 5 comprise a motor 51 provided with a motor pinion 52 meshing a toothed belt 53 secured to said support 50.
• This toothed belt 53 extends parallel to the median plane A and forms a closed loop which circulates between a receiving pinion 54 and the driving pinion 52.
• the support 50 is guided in translation by two parallel rails 55 integral with a chassis 6 and stopped in translation by two flexible stops 56 provided on this chassis.
• other drive, transmission and guidance means may be suitable. In FIG. 1, the extreme positions of the support 50 are shown on the left in a strong line and on the right in a thin line and partially.
• the chassis 6 is for example made of an assembly of mechanically welded sections and sheets and houses in particular the motors 40 and 51 of the first and second drive means 4, 5.
• This chassis 6 is covered with a cover 7, produced for example in an assembly of translucent sheets and plates, and in particular houses the tube 2, the knives 3, the carriages 34 and the support 50.
• This cutting device 1 also includes a programmable control unit (not shown) enabling the various motors 31, 40 and 51 to be controlled as a function of parameters such as the diameter, thickness and speed of travel of the tube 2, these motors being for example servomotors.
• This cutting device 1 allows great flexibility and great flexibility of use. It can be used to carry out only cutting operations but also combined operations partial cutting, grooving and cutting by the same knife 3 or the same pair of knives 3. If the cutting device 1 is equipped with several knives 3 or pairs of knives 3 arranged in separate cutting planes, the stroke of each knife 3 or pair of knives 3 can be programmed in the control unit so as to adapt it to the operation to be performed.
• this cutting device 1 can be suitable for a wide range of dimensions of tube 2 and can make quality cuts whatever the thickness of the tube 2.
• the cut is carried out in a known manner in a single step.
• the knives 3 are moved in radial translation in their cutting plane in the direction of the tube 2 over a cutting stroke equal at least to the thickness of the tube 2 to be cut.
• the section is cut in less than one turn of tube 2, or about half a turn.
• FIGS. 3A to 3D For tubes 2 of greater thickness E, for example greater than or equal to 20 mm and / or having high hardnesses or densities, the cutting is carried out in several successive stages as illustrated by FIGS. 3A to 3D.
• FIG. 3A the knives 3 are approached from the tube 2.
• FIG. 3B the knives 3 are moved by a first cutting stroke C1 less than the thickness E of the tube 2, so that after a first half turn, the tube 2 is partially cut to a depth PI.
• FIG. 3C the knives 3 are displaced by a second cutting stroke C2, the sum of the strokes Cl and C2 being still less than the thickness E of the tube 2, so that after a second half turn, that is to say a complete revolution, the tube 2 is partially cut to a depth P2.
• the knives 3 are displaced by a third cutting stroke C3, the sum of the strokes C1 to C3 now being equal to the thickness of the tube 2, so that after a third half turn, that is to say a turn and half, the tube 2 is cut completely over its entire thickness E.
• the next step is to move the knives 3 in the opposite direction and in a single step to be able to restart a cutting cycle.
• the number of cutting steps can vary depending on the parameters of the tube 2 which determine its ability to be cut, such as its thickness, density, hardness, material, etc.
• This step cutting process has the advantage of making a quality cut, without crushing or deforming the tube 2, without burrs, or false cutting and without deformation or deflection of the cutting blades 30
• each cutting stage will be made on at least one full turn of the tube 2.

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• Life Sciences & Earth Sciences (AREA)
• Forests & Forestry (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Making Paper Articles (AREA)
• Sawing (AREA)
• Nonmetal Cutting Devices (AREA)
• Turning (AREA)
• Accessories And Tools For Shearing Machines (AREA)

Applications Claiming Priority (2)

Publications (2)

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Family Applications (1)

Country Status (6)

Cited By (1)

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Family Cites Families (8)

• 2003
  • 2003-10-06 FR FR0311652A patent/FR2860447B1/fr not_active Expired - Fee Related
• 2004
  • 2004-10-05 WO PCT/IB2004/003230 patent/WO2005032774A1/fr active IP Right Grant
  • 2004-10-05 ES ES04791668T patent/ES2297508T3/es not_active Expired - Lifetime
  • 2004-10-05 AT AT04791668T patent/ATE380098T1/de not_active IP Right Cessation
  • 2004-10-05 DE DE602004010537T patent/DE602004010537T2/de not_active Expired - Lifetime
  • 2004-10-05 EP EP04791668A patent/EP1670621B1/de not_active Expired - Lifetime

Non-Patent Citations (1)

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