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
  • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
  • B26D7/26—Means for mounting or adjusting the cutting member; Means for adjusting the stroke of the cutting member
  • B26D7/2628—Means for adjusting the position of the cutting member
• • 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
  • B26D3/08—Making a superficial cut in the surface of the work without removal of material, e.g. scoring, incising
  • B26D3/085—On sheet material
• • 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
  • B26D5/02—Means for moving the cutting member into its operative position for cutting
  • B26D5/04—Means for moving the cutting member into its operative position for cutting by fluid pressure
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
  • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
  • B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
  • B26F1/38—Cutting-out; Stamping-out
  • B26F1/40—Cutting-out; Stamping-out using a press, e.g. of the ram type
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
  • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
  • B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
  • B26F1/38—Cutting-out; Stamping-out
  • B26F1/44—Cutters therefor; Dies therefor
• • 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
  • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
  • B26D7/26—Means for mounting or adjusting the cutting member; Means for adjusting the stroke of the cutting member
  • B26D2007/2607—Means for mounting or adjusting the cutting member; Means for adjusting the stroke of the cutting member for mounting die cutters
• • 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
  • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
  • B26D7/26—Means for mounting or adjusting the cutting member; Means for adjusting the stroke of the cutting member
  • B26D2007/2685—Means for mounting or adjusting the cutting member; Means for adjusting the stroke of the cutting member flexible mounting means
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
  • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
  • B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
  • B26F1/38—Cutting-out; Stamping-out
  • B26F1/44—Cutters therefor; Dies therefor
  • B26F2001/4454—Die heads carrying several moveable tools
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T83/00—Cutting
  • Y10T83/444—Tool engages work during dwell of intermittent workfeed
  • Y10T83/445—With work-moving clamp jaw
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T83/00—Cutting
  • Y10T83/444—Tool engages work during dwell of intermittent workfeed
  • Y10T83/4501—Work feed means controlled by means mounted on tool or tool support
  • Y10T83/4503—Such means drives the work feed means
  • Y10T83/4508—With supplemental work feed means
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T83/00—Cutting
  • Y10T83/647—With means to convey work relative to tool station
  • Y10T83/6572—With additional mans to engage work and orient it relative to tool station
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T83/00—Cutting
  • Y10T83/869—Means to drive or to guide tool
  • Y10T83/8776—Constantly urged tool or tool support [e.g., spring biased]
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T83/00—Cutting
  • Y10T83/869—Means to drive or to guide tool
  • Y10T83/8821—With simple rectilinear reciprocating motion only
  • Y10T83/8858—Fluid pressure actuated
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T83/00—Cutting
  • Y10T83/929—Tool or tool with support
  • Y10T83/9372—Rotatable type
  • Y10T83/9382—Punching plus nonpunching tool
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T83/00—Cutting
  • Y10T83/929—Tool or tool with support
  • Y10T83/9411—Cutting couple type
  • Y10T83/9416—To punch and cut punched article
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T83/00—Cutting
  • Y10T83/929—Tool or tool with support
  • Y10T83/9411—Cutting couple type
  • Y10T83/9418—Punching plus nonpunching tool

Definitions

• the present invention relates to a notch cutting device for cutting packaging materials, as defined in the preamble of independent claim 1.
• the films used here are generally plastic or metal films, for example made of polystyrene, polyethylene, polypropylene or aluminum, and in particular composites thereof.
• Notch cut devices which have a die and a knife part with a large number of knives and stamps, are used for separating packaging, among other things.
• the strand of packaging material in which the individual packages are usually already formed, is inserted between the die and the knife part.
• the die and the knife part are then moved towards one another, as a result of which the packaging material is pinched, punched by the punches and cut by the knives.
• the die and the knife part are moved apart again, ensuring that the packaging material detaches from the knife part and the die, so that the packaging material strand is advanced further can.
• the release of the packaging material is achieved, for example, on the part of the knife by resilient wipers and on the part of the die by pulling the latter away.
• the packaging material can either be cut completely or it can even be notched, i.e. be cut, the latter leading to the formation of predetermined separation points, as are known, for example, from connected yoghurt pots. Whether a knife cuts through the packaging material completely or only cuts it depends on how close the die and the knife are brought to each other. Depending on the packaging material, there are different minimum distances between the die and knife for a complete separation of the same is coming.
• a notch cutting device of the type mentioned at the outset is to be created which, with the least possible wear on the knives, enables a clean cut to be carried out with high process reliability, in particular also with tough packaging materials.
• the essence of the invention is that in a notch cutting device for cutting packaging materials, with a die and a knife part, which has at least two knives, the die and the knife part being movable relative to one another to make a cut, at least one of the knives is arranged in a force-dependent manner in the knife part in such a way that its position relative to a tool plate changes in a defined manner as a function of the force arising from contact with a packaging material or the die, one being in the case of contact between the knife and the die Force acts on the knife that does not exceed a predetermined maximum force.
• the knife part is arranged as a function of force, differences between individual knives with regard to the minimum distance between the knife and the die can be compensated for when making a cut. Since the knife, which is arranged depending on the force, changes its position depending on the force exerted on the knife by the packaging material or by the die, this means e.g. can retreat, and since a predetermined maximum force is not exceeded even in the event of a contact between the knife and the die, unnecessarily high forces on the knife and thus unnecessary material stress and wear, in particular material fatigue and deformation of the knife edge can be avoided or minimized become. In addition, it is not necessary to immediately replace a knife that is more worn than the other, since the shortening of individual knives caused by wear is compensated for by less retraction of these knives.
• the die can then be brought all the way to all these knives or all these knives can be brought all the way to the die.
• the predetermined maximum force is advantageously adjustable. This setting can be used, for example, to adapt to a specific packaging material.
• the notch cutting device is advantageously designed and controlled in such a way that when a cut is made by moving the knife part and the die onto the knife, a force of at most 1000 N per mm knife length, preferably 10-100 N per mm knife length and per mm thickness of the packaging material to be cut. With these forces, the knives are not worn out unnecessarily quickly. In order to make a good cut, on the other hand, depending on the packaging material, a separation force of at least 10 N per mm knife length and per mm material thickness is generally required.
• the arrangements of the individual knives in the knife part are advantageously between a cutting position and one Notch position changeable, a knife in the cutting position when making a cut completely cuts through the packaging material arranged between the knife and the die, while a knife in the notch position only cuts the packaging material arranged between the knife and the die. This enables the cutting configuration to be changed in a simple manner.
• the latter is mounted on the tool plate via a gas cushion, preferably means for supplying and discharging gas into or out of the gas cushion, which enable the position of the Knife against the tool plate from the force acting on the knife.
• a gas cushion preferably means for supplying and discharging gas into or out of the gas cushion, which enable the position of the Knife against the tool plate from the force acting on the knife.
• This setting can be used, for example, to adapt to a specific packaging material.
• a liquid medium is used instead of a gas.
• a knife for the force-dependent arrangement of a knife, it is mounted on a tool plate via at least one elastic part, preferably one or more compression springs or a rubber cushion.
• at least one direct or indirect stop for the knife which limits the compression of the elastic part by the knife, for example by absorbing the active forces together with the knife when the knife retreats strongly.
• the elastic part is protected against impermissibly high de- Formations and stresses protected.
• At least one of the knives in the knife part is arranged so that it retracts in a force-dependent manner so that it retains its position under a load that is less than a limit force and at a load that is greater than this limit force. As soon as the die exerts a force on the knife that is higher than the limit force, the knife withdraws. In this way, unnecessary wear or damage to the knife, for example in the case of a foreign body present on the packaging material at the interface, can be avoided.
• each knife in the knife part against which the knife is supported directly or indirectly in the notch position when making a cut.
• the stop is preferably adjustable so that the depth of cut can be changed.
• a stop preferably adjustable, in the knife part, against which the knife is supported, directly or indirectly, when making a part of a cut that requires a comparatively greater cutting force, while the rest is following the cut, which requires a comparatively smaller cutting force, is spaced from it.
• the force acting on the knife unites reached a certain value, the knife is supported directly or indirectly on the stop. If the force acting on the knife falls below this certain value again, for example at the end of the cutting process, the force-dependent arrangement moves the knife into a position closer to the die or it is moved completely to the die and the packaging material is completely separated.
• FIG. 1 shows a sectional view of a first exemplary embodiment of the notch cutting device according to the invention with knives and stops for the notch position arranged in a force-dependent manner by means of gas cushions;
• FIG. 2 shows a bottom view of the knife part of the notch cutting device from FIG. 1;
• FIG. 3 shows a detail of the notch cutting device from FIG. 1 in the cutting and punching position
• Fig. 4 - a sectional view of part of the notch cutting device along the line II in Fig. 1 with a strand of packaging material before cutting;
• Fig. 6 - a sectional view of part of a second
• FIG. 7 the notch cutting device according to FIG. 6 in the cutting and punching position
• Fig. 8 - a sectional view of part of a third
• FIG. 9 the notch cutting device according to FIG. 8 in the cutting and punching position
• FIG. 10 shows a sectional view of part of a fourth exemplary embodiment of the notch cutting device according to the invention with knives and stops arranged to be force-dependent by means of compression springs for supporting the knives;
• FIG. 11 the notch cutting device according to FIG. 10 in a first cutting and punching position
• Fig. 12 the notch cutting device according to FIG. 10 in a second cutting and punching position.
• the illustrated first exemplary embodiment of a notch cutting device comprises, as a framework, a table top 7 and a head board 70, which are connected to one another by a total of four connecting columns 71, two of which are visible in FIG. 1.
• a tool plate 4 is fastened to the head plate 70, on which in turn a stamp holding plate 31 is attached.
• a total of four knives 2, which together form approximately a square, four stops 25, four punches 3, eight wipers 5 and two guide columns 41 are arranged on the tool plate 4 and the punch holding plate 31.
• the elements arranged directly and indirectly on the tool plate 4 are also referred to collectively as a knife part in the context of the present description.
• the two guide columns 41 each protrude into a guide column channel 14 which is formed in a die base 13 and a die plate 11 mounted thereon.
• the die plate 11 carries a die 1 and, together with it, has four punch channels 12, into which the four punches 3 penetrate when a cut is made.
• the die base 13, the die plate 11 and the die 1 are moved vertically upwards by means of a piston 61 of a hydraulic drive with a hydraulic cylinder 6, so that the packaging material 9 is clamped and cut between the die 1 and the knife part becomes .
• the knives 2 are each connected to a piston 22 by means of two knife holders 21, each of which is vertically displaceably mounted in a gas chamber 23 formed in the tool plate 4.
• the gas chamber 23 On the piston side facing away from the plunger holding plate 31, the gas chamber 23 is filled with a gas, for example N 2 or compressed air, which is under a pressure of up to 300 bar.
• An annular seal 26 prevents gas from escaping from the gas chamber 23 between the chamber wall and the piston 22.
• the gas cushion present in the gas chamber 23 forms a compressible mass which, when the pressure on the knife 2 is sufficiently great and thus on the knife holder 21 is compressed onto the piston 22, so that the piston 22 and the knife 2 move upward can dodge.
• Gas can be withdrawn or supplied to the gas chamber 23 via a gas channel 24, as a result of which the pressure or a limiting force can be set. If a smaller force than the limit force acts on the knife 2, it maintains its position relative to the tool plate 4; if a force acts greater than the magnitude, it will recede.
• the pressure is preferably set such that a force of typically 10-100 N per mm knife length and per mm thickness of the packaging material, but at most 1000 N per mm knife length, acts on the knife 2 during the cutting.
• the stop 25 serves as an indirect support for the knife 2 in the so-called notch position. If the packaging material 9 is not to be completely cut through, but only to be cut or notched, then the knife 2 has to be cut Surrender of a cut even at the lowest pressure, which can be achieved by lowering the gas pressure in the gas chamber 23 by removing gas via the gas channel 24. When making a cut, the knife 2 deflects upwards until the piston 22 abuts the stop 25.
• the notch cut depth in the packaging material 9 can be adjusted by vertically adjusting the stop 25, here by screwing it in or out.
• the stamps 3 are screwed tightly to the tool plate 4 and held by the stamp holding plate 31. When making a cut, they punch star-shaped holes in the packaging material 9 and penetrate into the stamp channels 12 in the die 1.
• the wipers 5 are mounted in the tool plate 4 via compression springs 51.
• the wipers 5 are first pressed into the tool plate 4 by the die 1, the compression springs 51 being compressed. If the die 1 is then pulled down again, the compression springs 51 relax and push the wipers 5 and the latter push the packaging material 9 downwards.
• FIG. 5 shows the notch cutting device when cutting packaging material 9 in the form of yoghurt cups at the point in time at which the die 1 and the knife part are at the smallest distance from one another.
• the left knife 2 in the cutting position has completely cut through the packaging material 9 and touches the Die 1, while the right knife 2 in the notch position has only cut or notched the packaging material 9.
• the cutting position of the left knife 2 results from the fact that from a compressed gas supply 8 via a pressure reducer 81, a left switching valve 82 and the left gas channel 24, the gas chamber 23 is acted upon by compressed gas, which exerts a force on the left piston 22 is greater than the separating force used for cutting.
• the separating force required depends on the packaging material 9 to be cut, but is normally at least 10 N per mm of knife length and per mm of thickness of the packaging material. It can be seen that the left piston 22 has shifted a little upwards in the position shown in FIG. 5 with respect to the basic position shown in FIG. 4, the knife 2 has therefore been pushed upwards by the die 1, with compression of the Compressed gas present in the gas chamber 23.
• This second exemplary embodiment of a notch cutting device according to the invention largely corresponds to the first.
• the gas channels 124 are each arranged centrally above the gas chambers 123.
• a notch cutting device designed in this way is particularly advantageous when a knife 2 sometimes has to be disconnected so that it no longer cuts at all.
• the force-dependent arrangement of the knives 2 does not take place via gas cushions, but rather via two mechanical compression springs 222, which are arranged in the tool plate 204.
• a counter or limit force generated by the compression springs 222 can be set by means of adjusting screws 223.
• the knife 2 begins to recede after the counter or limit force has been reached, the force at the knife edge having to increase further with the distance that the knife is to recede.
• the counter or limit force can also be set to the value 0. In this case, the knife 2 begins to retreat when the packaging material 9 is touched.
• the structure of the notch cutting device corresponds to that of the first two exemplary embodiments.
• This fourth embodiment of a notch cutting device according to the invention largely corresponds to the third.
• the stamp holding plate 331 is provided with stops 332 for the knife holder 321 having shoulders 322.
• an intermediate plate 333 is arranged between the knife holders 321 and the compression springs 222.
• the knives 2 which are arranged in a force-dependent manner, are supported on the stops 332 via the shoulders 322 of the knife holders 321 as soon as the forces acting on the knives 2 are caused by the
• Compression springs 222 reach certain values, similar to that described in the first exemplary embodiment for the knives 2 in the so-called notch position. If the forces acting on the knives 2 fall below the forces defined by the compression springs 222, e.g. towards the end of the cutting process, the knives 2 are pressed down against the die 1 with the forces defined by the compression springs 222, as shown in FIG. 12.
• the defined forces can also, as in the first two exemplary embodiments, len, by gas pillows or by pillows, which are formed by a liquid medium, are applied.
• the stops 332 also fulfill the function of protecting the mechanical compression springs 222 against impermissibly high deformations or stresses by limiting the retraction of the knives 2.
• the knife part can have a large number of knives 2 and stamps 3, which can be arranged in a wide variety of configurations.
• the knife part can also be moved towards the die 1 conversely.
• any other drives with which sufficiently large forces can be generated such as e.g. Eccentric or toggle lever drives.

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• Life Sciences & Earth Sciences (AREA)
• Forests & Forestry (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Physics & Mathematics (AREA)
• Fluid Mechanics (AREA)
• Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
• Nonmetal Cutting Devices (AREA)
• Control And Other Processes For Unpacking Of Materials (AREA)

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• 2000
  • 2000-12-06 AT AT00977338T patent/ATE260740T1/de not_active IP Right Cessation
  • 2000-12-06 DE DE50005552T patent/DE50005552D1/de not_active Expired - Lifetime
  • 2000-12-06 WO PCT/CH2000/000646 patent/WO2001041984A1/fr active IP Right Grant
  • 2000-12-06 EP EP00977338A patent/EP1235668B1/fr not_active Expired - Lifetime
  • 2000-12-06 ES ES00977338T patent/ES2215082T3/es not_active Expired - Lifetime
  • 2000-12-06 US US10/148,470 patent/US7047858B2/en not_active Expired - Fee Related

Non-Patent Citations (1)

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