EP4019415B1 - Hoisting gear - Google Patents

Hoisting gear Download PDF

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Publication number
EP4019415B1
EP4019415B1 EP21204898.7A EP21204898A EP4019415B1 EP 4019415 B1 EP4019415 B1 EP 4019415B1 EP 21204898 A EP21204898 A EP 21204898A EP 4019415 B1 EP4019415 B1 EP 4019415B1
Authority
EP
European Patent Office
Prior art keywords
lifting
toggle
pressure part
lifting gear
drive unit
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.)
Active
Application number
EP21204898.7A
Other languages
German (de)
French (fr)
Other versions
EP4019415A1 (en
Inventor
Maximilian Hetz
Stefan OBERSCHACHTSIEK
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.)
Multivac Sepp Haggenmueller GmbH and Co KG
Original Assignee
Multivac Sepp Haggenmueller GmbH and Co KG
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.)
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Publication date
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Publication of EP4019415A1 publication Critical patent/EP4019415A1/en
Application granted granted Critical
Publication of EP4019415B1 publication Critical patent/EP4019415B1/en
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66FHOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F3/00Devices, e.g. jacks, adapted for uninterrupted lifting of loads
    • B66F3/46Combinations of several jacks with means for interrelating lifting or lowering movements
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65BMACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B51/00Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
    • B65B51/10Applying or generating heat or pressure or combinations thereof
    • B65B51/14Applying or generating heat or pressure or combinations thereof by reciprocating or oscillating members
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B30PRESSES
    • B30BPRESSES IN GENERAL
    • B30B1/00Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen
    • B30B1/10Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by toggle mechanism
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B30PRESSES
    • B30BPRESSES IN GENERAL
    • B30B7/00Presses characterised by a particular arrangement of the pressing members
    • B30B7/04Presses characterised by a particular arrangement of the pressing members wherein pressing is effected in different directions simultaneously or in turn
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65BMACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B65/00Details peculiar to packaging machines and not otherwise provided for; Arrangements of such details
    • B65B65/02Driving gear
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65BMACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B9/00Enclosing successive articles, or quantities of material, e.g. liquids or semiliquids, in flat, folded, or tubular webs of flexible sheet material; Subdividing filled flexible tubes to form packages
    • B65B9/02Enclosing successive articles, or quantities of material between opposed webs
    • B65B9/04Enclosing successive articles, or quantities of material between opposed webs one or both webs being formed with pockets for the reception of the articles, or of the quantities of material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66FHOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F3/00Devices, e.g. jacks, adapted for uninterrupted lifting of loads
    • B66F3/24Devices, e.g. jacks, adapted for uninterrupted lifting of loads fluid-pressure operated
    • B66F3/245Devices, e.g. jacks, adapted for uninterrupted lifting of loads fluid-pressure operated comprising toggle levers

Definitions

  • the present invention relates to a lifting mechanism according to claim 1, which is designed on a packaging machine for opening and closing a work station formed thereon.
  • EP 0 895 933 A1 discloses a lifting device that has a lever system that is coupled to the adjustment movement of a lower tool part for lifting a base of the lifting device and a tool upper part that is firmly connected to it.
  • lowering the tool lower part into the open position of the lifting device simultaneously causes the height-adjustable base and thus the entire lifting device to be raised relative to the machine frame via the lever system in order to space the tool upper part from an upper film guided underneath.
  • Several adjustment drives and guides are used to operate this lifting device, which means that the lifting device is associated with high manufacturing costs.
  • EN 10 2006 006 218 A1 discloses a lifting mechanism with a toggle lever mechanism that is connected to a height adjustment of the lifting table in order to raise or lower a lower frame and a tool upper part connected thereto in response to the displacement of the lifting table.
  • the disadvantage of this is that the lifting mechanism, in particular the toggle lever mechanism provided thereon, for lifting the assembly, comprising the lower frame and the tool upper part carried on it, is associated with high manufacturing costs. This is due, among other things, to the fact that several guide units are required due to the high weight to be lifted via the toggle lever mechanism.
  • the toggle lever units used are primarily used to adjust the upper part of the tool. To achieve this, structurally complex drive and guide units are necessary, which leads to high manufacturing costs.
  • EP 3 294 636 B1 discloses a lifting device with a lifting table, which is preferably guided by at least two guide rods when being raised and lowered.
  • the lifting device has two toggle lever devices which are provided outside a machine frame.
  • the toggle lever devices can support a tool base in its raised position, ie minimize a load when the tool base is connected to a tool upper part.
  • the lifting device takes up a large amount of space overall.
  • a work station for a blister packaging machine is disclosed.
  • This work station has a toggle lever device by means of which a tool base can be raised and lowered.
  • the toggle lever device has two toggle lever joints, the operation of which is supported by guide elements.
  • the object of the invention is to provide a lifting mechanism with an adjustment mechanism which can be produced cost-effectively, in particular due to a reduced number of components provided thereon, and which is ideally suited to a packaging machine for a precise height adjustment of a tool lower part of a work station provided thereon.
  • the invention relates to a lifting mechanism for opening and closing a work station of a packaging machine, wherein the lifting mechanism has a stationary base, a lifting table which is mounted so as to be height-adjustable relative to the base along a lifting axis for supporting a tool lower part of the work station, and an adjustment mechanism for the lifting table which comprises a drive unit and a toggle lever device on which the lifting table is mounted.
  • the adjustment mechanism further comprises a pressure part which is adjustable by means of the drive unit, in particular along the lifting axis, and which is coupled to the toggle lever device, by means of the displacement of which the toggle lever device can be actuated to adjust the height of the lifting table along the lifting axis.
  • the adjustment mechanism for the lifting table comprises the drive unit, the pressure part which is adjustable in height with it, and the toggle lever device coupled thereto, wherein the pressure part is provided as a coupling element between the drive unit and the toggle lever device in order to transmit an adjustment force of the drive unit to the lifting table via the toggle lever device so that the latter can be raised or lowered.
  • the toggle lever device is thus present as a coupling gear between the drive unit and the lifting table.
  • the adjustment force of the drive unit therefore does not act directly, but indirectly, i.e. via the associated toggle lever device, on the lifting table for its height adjustment.
  • the toggle lever device can be used in particular as a transmission gear or as a Guide gear between the drive unit and the lifting table.
  • the height adjustment of the lifting table is thus the result of the adjustment movements of the drive unit and the toggle lever device that result along the lifting axis, are sequential or build on each other.
  • the knee lever principle can be used to advantage with the knee lever device, for example for quickly closing and opening the work station, which can increase the throughput rate on the packaging machine.
  • Such an adjustment mechanism is also compact overall, offers precise guidance and is particularly characterized by the possibility of a reduced number of components used to adjust the lifting table, so that the lifting mechanism can be manufactured cost-effectively overall.
  • the toggle lever device in the invention is a coupling gear, in particular a transmission gear and/or a guide gear for the lifting table, i.e. for the lower part of the tool mounted on it, and not for the upper part of the tool.
  • the adjustment movement of the drive unit can thus be translated, for example accelerated, to the lifting table using the toggle lever device in accordance with the toggle lever principle, which makes the lifting mechanism particularly economical to use.
  • the toggle lever device can prevent forces acting on the lower part of the tool and thus also on the lifting table, for example a Siegland force, from acting directly on the drive unit.
  • the invention provides that the toggle lever device has three separate toggle lever joints that can be operated together by moving the pressure part.
  • the respective toggle lever joints can thus be adjusted synchronously with one another in order to raise or lower the lifting table mounted on it evenly along the lifting axis, i.e. without it tipping over to the horizontal.
  • the respective toggle joints can each have three toggle levers. These can be connected to one another in an articulated manner at the ends formed thereon.
  • the toggle levers are attached to the base, the pressure part and the lifting table at the other ends.
  • raising the pressure part can cause two toggle levers to be extended, i.e. raising the lifting table, and lowering the pressure part can cause the two toggle levers to fold together, i.e. lowering the lifting table.
  • the knee lever device alone supports the lifting table.
  • the knee lever device that supports the lifting table is therefore the only direct substructure for the lifting table.
  • the toggle joints are arranged at a predetermined angle to one another in such a way that their joint operation functions as a linear guide for adjusting the lifting table along the lifting axis.
  • the toggle joints are designed and mounted at a certain angle to one another in such a way that together they form a guide gear for the lifting table. This means that simply by pivoting the respective toggle joints together at the same time, a movement along the lifting axis is achieved for the lifting table, i.e. the toggle joints themselves form a linear guide for the lifting table.
  • the toggle lever device has, preferably a total of, four separate toggle lever joints, which are arranged in pairs, crossed over, in a first and a second adjustment plane.
  • the toggle levers of one pair of toggle lever joints can pivot in the first adjustment plane and the toggle levers of the other pair of toggle lever joints can pivot in the second adjustment plane.
  • the toggle lever joints can work together in such a way that the lifting table only has one degree of freedom, namely along the lifting axis.
  • the two adjustment planes can be arranged at a predetermined angle to one another, which is, for example, 10° to 35° or 80° to 100°.
  • the first and second adjustment planes intersect along a drive axis of the drive unit.
  • the drive axis and the lifting axis are aligned with each other, preferably in a vertical direction.
  • the respective toggle joints can also work together in such a way that the lifting table only has one degree of freedom along the lifting axis. Otherwise, this already results in an extremely robust linear guide function for the lifting table along the lifting axis, so that additional, usually expensive linear guides can be dispensed with.
  • the toggle lever device can have three or four separate toggle lever joints, whereby toggle lever joints arranged in pairs next to one another can be adjusted in respective adjustment planes that intersect along a cutting line running parallel to a drive axis of the drive unit. This enables a particularly robust displacement of the lifting table because this automatically creates a stable guide for the lifting table displacement.
  • first pair it would be possible for a first pair to be formed from two toggle joints arranged next to each other and a second pair from the other two toggle joints arranged next to each other, with the respective adjustment planes of the two toggle joint pairs intersecting along intersection lines running parallel to the drive axis of the drive unit.
  • the two intersection lines are preferably the same distance from the drive axis. This ensures even load distribution during the lifting movement.
  • the pressure part is designed in the form of a plate.
  • the pressure part has a high mechanical rigidity.
  • the pressure part is perfectly suited to actuating the toggle lever device in a small installation space.
  • the toggle lever device is attached to the pressure part on the circumference.
  • the pressure part can thus be surrounded by the respective toggle lever joints provided on the toggle lever device.
  • the pressure part can be immersed in a space left free between the toggle lever joints for actuating the toggle lever joints attached to it on the circumference, so that overall a height-reduced structure is created. This also simultaneously results in a stable substructure for the lifting table mounted on it in a height-adjustable manner, so that the lower part of the tool mounted on it can absorb large forces.
  • the pressure part has an X-shaped contour. This allows the pressure part to be manufactured with reduced weight. Furthermore, it can provide advantageous attachment locations for the toggle lever device at its outward-facing ends provided thereby.
  • the pressure part has an O-shaped contour, for example in the form of a disk.
  • the disk could preferably have a diameter between 10cm and 30cm.
  • the toggle lever device i.e. the respective Knee lever joints must be attached to the circumference of the disc so that the knee lever joints are spaced apart from each other to ensure stable mounting of the lifting table.
  • the pressure part can be adjusted by means of the drive unit between a lowered position in which the pressure part is positioned closer to the base and a raised position in which the pressure part is positioned at a distance from the base.
  • the pressure part is positioned vertically below the toggle lever device when it is in the lowered position, and in the raised position it is positioned in the middle of the toggle lever device, i.e. between the toggle lever joints provided thereon. In addition to a compact design, this also results in a particularly uniform actuating force on the surrounding toggle lever joints.
  • One embodiment of the invention provides that the pressure part in the lowered position is positioned below the lower mounting bearings provided on the base for the toggle joints and/or the pressure part in the raised position is positioned above the lower mounting bearings provided on the base for the toggle device. This creates a particularly favorable force-motion transmission ratio that is exerted on the lifting table for its height adjustment by means of the toggle device, depending on the toggle principle generated thereby.
  • the toggle lever device is movable between a folded position and an extended position, in which upper attachment bearings provided on the lifting table for the toggle lever device have a different, in particular a smaller or larger, distance from each other than lower attachment bearings provided on the base for the toggle lever device.
  • the toggle lever device acts here as a centering unit to prevent the lifting table from tipping over.
  • the respective distances between the upper and lower attachment bearings can be selected in such a way that any naturally occurring play in the toggle lever joints has a negligible effect.
  • the centering function can in particular ensure that the lifting table comes to a stop in the same position with each lift.
  • the toggle lever device in particular the toggle lever joints formed thereon, in such a way that the lifting table mounted thereon during a lifting movement remains at least horizontally aligned. This allows the lower part of the tool stored on the lifting table to be brought together more precisely with an upper part of the tool arranged above it in order to carry out a packaging process in between, for example a deep-drawing process or a sealing process.
  • the pressure part is adjustable in a linear manner along the lifting axis. This allows the toggle joints arranged around the pressure part and attached to it to be operated precisely in order to adjust the lifting table mounted on it along the lifting axis.
  • a particularly cost-effective variant can be provided by guiding the pressure part on the drive side along the stroke axis solely by a retractable and extendable piston of the drive unit. This means that no further linear guide is assigned to the drive unit to guide the pressure part that can be adjusted with it.
  • the toggle lever device can be configured in such a way that the toggle lever joints, which are arranged on the circumference of the pressure part, hold it on the lifting axis.
  • the toggle lever joints simultaneously provide support to the pressure part from the outside so that it remains positioned along the lifting axis.
  • the piston rod and the toggle lever joints together thus provide a type of cascade guide for the pressure part and in particular for the lifting table. This means that separate linear guides are not required.
  • the lifting mechanism can have at least one separate linear guide for the pressure part. It would be conceivable to provide at least one linear guide mounted on the base next to the drive unit, which can support a linear extension movement of the piston of the drive unit.
  • the drive unit prefferably, it is practical for the drive unit to be designed as a pneumatic cylinder or electric cylinder. These take up little space on the lifting gear and are inexpensive to manufacture. Preferably, only a single pneumatic cylinder or electric cylinder is used.
  • the lifting mechanism according to the invention is particularly suitable for use on a thermoforming packaging machine or on a tray sealing machine, in particular as a lifting mechanism for a sealing station formed thereon, in order to bring together a sealing tool lower part provided thereon with a sealing tool upper part arranged above it for a sealing process that can be carried out between them.
  • FIG. 1 shows a perspective view of an intermittently operating thermoforming packaging machine 1.
  • This thermoforming packaging machine 1 has a forming station 2, a sealing station 3, a cross-cutting device 4 and a longitudinal cutting device 5, which are arranged in this order in a transport direction R on a machine frame 6.
  • the thermoforming packaging machine 1 also has a transport chain 11, which grips the bottom film 8 and transports it further in the transport direction R per main work cycle, in particular transport chains or clamp chains 11 arranged on both sides.
  • the forming station 2 is designed as a deep-drawing station in which troughs are formed in the bottom film 8 by deep-drawing, for example by means of compressed air and/or vacuum.
  • the forming station 2 can be designed in such a way that several troughs are formed next to one another in the direction perpendicular to the transport direction R.
  • a filling section 12 is provided in which the troughs formed in the bottom film 8 are filled with products.
  • the sealing station 3 has a hermetically sealable chamber 3a in which the atmosphere in the troughs can be evacuated, for example, and/or replaced by gas flushing with a replacement gas or with a gas mixture before sealing with the upper film 10 released from an upper film holder 9.
  • the cross-cutting device 4 can be designed as a punch that cuts the bottom film 8 and the top film 10 in a direction transverse to the transport direction R between adjacent troughs.
  • the cross-cutting device 4 works in such a way that the bottom film 8 is not cut across the entire width, but is not cut at least in one edge area. This enables controlled further transport through the transport chain 11.
  • the longitudinal cutting device 5 can be designed as a knife arrangement with which the lower film 8 and the upper film 10 are severed between adjacent troughs and at the lateral edge of the lower film 8 in the transport direction R, so that individual packages are present behind the longitudinal cutting device 5.
  • These chain guides 13 are each protected on the outside by a side panel 14 of the thermoforming packaging machine 1 and, if necessary, are attached to the side panel 14.
  • the side panel 14 can be a sheet metal part.
  • the thermoforming packaging machine 1 also has a control system 19. Its task is to control and monitor the processes taking place in the thermoforming packaging machine 1.
  • a display device 20a with operating elements 20b is used to visualize or influence the process sequences in the thermoforming packaging machine 1 for or by an operator.
  • FIG. 2 shows a tray sealing machine 15, which is also called a "tray sealer” in technical circles.
  • This tray sealing machine 15 has a feed belt 16, a sealing station 17 and a discharge belt 18, which are arranged in this order in the transport direction R on a machine frame 21.
  • the tray sealing machine 15 also comprises a gripper device 22, by means of which prefabricated trays S can be picked up from the feed belt 16 and transported to the sealing station 17 for a sealing process taking place therein.
  • the gripper device 22 is also designed to grip sealed trays S within the sealing station 17 and to deliver them to the discharge belt 18 for removal thereon.
  • the unsealed trays S positioned within the sealing station 22 can be sealed by means of a top film 23 passed through the sealing station 22.
  • Figure 3A shows a lifting mechanism 24 for opening and closing a work station of a packaging machine.
  • the work station can, for example, be used as a sealing station 3 of the Figure 1 shown thermoforming packaging machine 1 or as sealing station 17 of the in Figure 2 shown tray sealing machine 15.
  • the lifting mechanism 24 is shown in an open position S1.
  • the lifting mechanism 24 has a base 25, a lifting table 26 which is mounted so that it can be adjusted in height relative to the base 25 along a lifting axis H and on which a tool base 27, which is in the form of a shell holder 31, is positioned.
  • the lifting mechanism 24 also comprises an adjustment mechanism 28 which has a drive unit 29 and a toggle lever device 30.
  • the tray holder 31 is designed to receive troughs that are formed along the thermoforming packaging machine 1.
  • the lower tool part 27 can be brought together with an upper tool part 32 arranged above it for a packaging process, for example for a sealing process.
  • the lifting mechanism 24 is attached to a machine frame 33 on both sides.
  • the base 25 of the lifting mechanism 24 is connected to the machine frame 33 by means of support rods 34, i.e. is mounted in a stationary manner relative to the machine frame 33.
  • support rods 34 i.e. is mounted in a stationary manner relative to the machine frame 33.
  • the base 25 remains mounted in a stationary manner.
  • Two supports 35 are attached to the lower ends of the support rods 34 transversely to the transport direction R.
  • a base plate 36 is mounted on the two supports 35.
  • the support rods 34, the two supports 35 and the base plate 36 attached to them form a load-bearing base 25 attached to the machine frame 33.
  • FIG. 3A shows Figure 3A that the drive unit 29 is attached to the base plate 36.
  • the drive unit 29 is designed as a piston-cylinder unit 37.
  • the piston-cylinder unit 37 is, for example, a pneumatic cylinder or an electric cylinder, which is provided for adjusting the lifting table 26 along the lifting axis H.
  • Figure 3A also shows that the adjustment mechanism 28 has a pressure part 38 which is adjustable along the lifting axis H by means of the drive unit 29 and coupled to the toggle lever device 30, by means of whose displacements along the lifting axis H the toggle lever device 30 can be actuated for a height adjustment of the lifting table 26.
  • Figure 3B shows the lifting mechanism 24 in a closed position S2, in which the lower tool part 27 and the upper tool part 32 are brought together.
  • the Figure 3A in a lowered position P1 shown pressure part 38, in which it is positioned close to the base plate 36, in the Figure 3B shown raised position P2, in which the Pressure part 38 is positioned at a distance from the base plate 36.
  • the toggle lever device 30 is compared to a Figure 3A
  • the folded position M1 shown is now adjusted to a stretched position M2.
  • toggle lever joints 39a to 39d are arranged in pairs, crossing each other, in a first and a second adjustment plane E1, E2.
  • the respective toggle levers of the two toggle lever joints 39a and 39c can be pivoted in the adjustment plane E1 and the respective toggle levers of the other two toggle lever joints 39b and 39d can be pivoted in the adjustment plane E2.
  • the two adjustment planes E1, E2 are arranged at a predetermined angle ⁇ to each other.
  • the angle ⁇ is an acute angle and is, for example, 20°.
  • the two adjustment planes E1, E2 intersect along a drive axis A of the drive unit 29.
  • Figure 3B also shows that the piston-cylinder unit 37 has an extendable piston 40 which is adjustable along the drive axis A, which is aligned with the lifting axis H.
  • the pressure part 38 attached to an upper end of the piston 40 causes, by means of its displacement along the drive axis A, that the toggle lever device 30 moves between the folded-in position M1 from Figure 3A and the extended position M2 of the Figure 3B
  • the toggle lever joints 39a to 39d of the toggle lever device 30 can thus be adjusted synchronously in order to move the lifting table 26 mounted thereon along the lifting axis H.
  • Figure 3B also shows that in the extended position M2 of the toggle lever device 30, upper mounting bearings 41a, 41b have a distance a from each other. Furthermore, Figure 3B that lower mounting bearings 42a, 42b provided on the base 25 for the toggle lever device 30 have a distance b from each other. The Figure 3B The distance a shown between the upper mounting bearings 41a, 41b is smaller than the distance b between the lower mounting bearings 42a, 42b.
  • a centering function is provided for the lifting table 26, which can be adjusted thereby, during the lifting of the pressure part 38 via the toggle lever device 30, so that it comes to a stop at a predetermined position with each stroke, ie the lower tool part 27 positioned thereon is brought together precisely with the upper tool part 32 arranged above it with each stroke.
  • a linear guide 43 positioned next to the piston-cylinder unit 37 is provided on the base plate 36.
  • Such a linear guide 43 could also be provided on the base plate 36 in duplicate on opposite sides of the piston 40.
  • the adjustment mechanism 28 also functions without the separate linear guide 43. This results in a guided height adjustment of the lifting table 26 along the lifting axis H solely by the piston 40 of the piston-cylinder unit 37, which can be extended along the drive axis A, and the respective toggle lever joints 39a to 39d.
  • Figure 4 shows the Figure 3B mounted toggle lever device 30 from above.
  • the intersection line formed by the two adjustment planes E1, E2 corresponds here to the drive axis A of the drive unit 29.
  • the two adjustment planes E1, E2 intersect at an angle ⁇ .
  • the angle ⁇ is in particular 80° to 100°.
  • FIG. 5 shows a different arrangement of the four toggle joints 39a to 39d.
  • the toggle joints 39a to 39d are adjustably mounted in the respective adjustment planes Ea, Eb, Ec, Ed.
  • the two adjustment planes Eb, Ec of the toggle joints 39b, 39c intersect in a straight line B.
  • the two adjustment planes Ea, Ed of the toggle joints 39a, 39d intersect in a straight line C.
  • the two straight lines B, C run parallel to the drive axis A of the drive unit 29.
  • Figure 5 that the two intersection lines B, C run equidistant from the drive axis A. This enables a particularly robust displacement of the lifting table 26, because this automatically creates a stable guide for it.
  • the respective pairs of intersection lines Ea, Ed and Eb, Ec intersect in particular at an angle of 80° to 100°.
  • FIG. 6 shows the two toggle joints 39b, 39c from above according to the arrangement of Figure 5 .
  • Figure 6 shows Figure 6 a third knee joint 39e, which connects the two Figure 5 shown toggle joints 39a, 39b.
  • These three toggle joints 39b, 39c, 39e have adjustment planes Eb, Ec, Ee that intersect along a single intersection line D that runs parallel to the drive axis A of the drive unit 29.
  • the toggle joint 39e is mounted in such a way that the drive axis A of the drive unit 29 lies in its adjustment plane Ee. This results in robust, precisely guided adjustability for the lifting table 26, even if only the three toggle joints 39b, 39c, 39e are used.
  • the arrangement of the respective toggle joints 39b, 39c, 39e could be such that their three adjustment planes Eb, Ec, Ee intersect each other at an angle of 120°.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Structural Engineering (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Description

Die vorliegende Erfindung betrifft ein Hubwerk gemäß dem Anspruch 1, das an einer Verpackungsmaschine zum Öffnen und Schließen einer daran ausgebildeten Arbeitsstation ausgebildet ist.The present invention relates to a lifting mechanism according to claim 1, which is designed on a packaging machine for opening and closing a work station formed thereon.

EP 0 895 933 A1 offenbart eine Hubeinrichtung, die ein Hebelsystem aufweist, das zum Anheben einer Basis der Hubeinrichtung sowie eines damit fest verbundenen Werkzeugoberteils an die Verstellbewegung eines Werkzeugunterteils gekoppelt ist. Bei dieser Vorrichtung bewirkt ein Absenken des Werkzeugunterteils in die geöffnete Stellung der Hubeinrichtung gleichzeitig über das Hebelsystem ein Anheben der höhenverstellbar gelagerten Basis und damit der gesamten Hubeinrichtung relativ zum Maschinenrahmen, um somit das Werkzeugoberteil von einer darunter geführten Oberfolie zu beabstanden. Für den Betrieb dieser Hubeinrichtung werden mehrere Verstellantriebe und Führungen eingesetzt, wodurch die Hubeinrichtung mit hohen Herstellungskosten verbunden ist. EP 0 895 933 A1 discloses a lifting device that has a lever system that is coupled to the adjustment movement of a lower tool part for lifting a base of the lifting device and a tool upper part that is firmly connected to it. In this device, lowering the tool lower part into the open position of the lifting device simultaneously causes the height-adjustable base and thus the entire lifting device to be raised relative to the machine frame via the lever system in order to space the tool upper part from an upper film guided underneath. Several adjustment drives and guides are used to operate this lifting device, which means that the lifting device is associated with high manufacturing costs.

DE 10 2006 006 218 A1 offenbart ein Hubwerk mit einem Kniehebelmechanismus, der an eine Höhenverstellung des Hubtisches angeschlossen ist, um in Reaktion auf die Verlagerung des Hubtisches einen unteren Rahmen sowie ein damit verbundenes Werkzeugoberteil anzuheben bzw. abzusenken. Nachteilig daran ist, dass das Hubwerk, insbesondere der daran vorgesehene Kniehebelmechanismus, zum Anheben des Zusammenbaus, umfassend den unteren Rahmen und das darauf getragene Werkzeugoberteil, mit hohen Herstellungskosten verbunden ist. Dies liegt unter anderem daran, dass aufgrund des hohen über den Kniehebelmechanismus anzuhebenden Gewichts gleich mehrere Führungseinheiten notwendig sind. EN 10 2006 006 218 A1 discloses a lifting mechanism with a toggle lever mechanism that is connected to a height adjustment of the lifting table in order to raise or lower a lower frame and a tool upper part connected thereto in response to the displacement of the lifting table. The disadvantage of this is that the lifting mechanism, in particular the toggle lever mechanism provided thereon, for lifting the assembly, comprising the lower frame and the tool upper part carried on it, is associated with high manufacturing costs. This is due, among other things, to the fact that several guide units are required due to the high weight to be lifted via the toggle lever mechanism.

Bei den beiden vorangehend beschriebenen Hubeinrichtungen kommen die darin eingesetzten Kniehebeleinheiten primär zum Verstellen des Werkzeugoberteils zum Einsatz. Um dies zu erreichen, sind konstruktiv aufwändige Antriebs- und Führungseinheiten notwendig, was zu hohen Herstellungskosten führt.In the two lifting devices described above, the toggle lever units used are primarily used to adjust the upper part of the tool. To achieve this, structurally complex drive and guide units are necessary, which leads to high manufacturing costs.

EP 3 294 636 B1 offenbart eine Hubeinrichtung mit einem Hubtisch, der beim Anheben und Absenken vorzugsweise durch mindestens zwei Führungsstangen geführt wird. Die Hubeinrichtung weist zwei Kniehebeleinrichtungen auf, die außerhalb eines Maschinenrahmens vorgesehen sind. Die Kniehebeleinrichtungen können ein Werkzeugunterteil in seiner angehobenen Position abstützen, d.h. eine Belastung minimieren, wenn das Werkzeugunterteil mit einem darüber angeordneten Werkzeugoberteil zusammengeführt ist. Dadurch, dass die Kniehebeleinrichtungen außerhalb des Maschinenrahmens befestigt sind, nimmt die Hubeinrichtung allerdings insgesamt einen großen Bauraum ein. EP 3 294 636 B1 discloses a lifting device with a lifting table, which is preferably guided by at least two guide rods when being raised and lowered. The lifting device has two toggle lever devices which are provided outside a machine frame. The toggle lever devices can support a tool base in its raised position, ie minimize a load when the tool base is connected to a tool upper part. However, because the toggle lever devices are attached outside the machine frame, the lifting device takes up a large amount of space overall.

In der DE 10 2012 003 839 A1 ist eine Arbeitsstation für eine Blisterverpackungsmaschine offenbart. Diese Arbeitsstation verfügt über eine Kniehebeleinrichtung, mittels welcher sich ein Werkzeugunterteil anheben und senken lässt. Die Kniehebeleinrichtung verfügt über zwei Kniehebelgelenke, deren Betätigung durch Führungselemente gestützt wird.In the EN 10 2012 003 839 A1 A work station for a blister packaging machine is disclosed. This work station has a toggle lever device by means of which a tool base can be raised and lowered. The toggle lever device has two toggle lever joints, the operation of which is supported by guide elements.

Aufgabe der Erfindung ist es, ein Hubwerk mit einem Verstellmechanismus zur Verfügung zu stellen, der insbesondere aufgrund einer reduzierten Anzahl daran vorgesehener Bauteile kostengünstig herstellbar ist und der sich an einer Verpackungsmaschine für eine präzise Höhenverstellung eines Werkzeugunterteils einer daran vorgesehenen Arbeitsstation bestens eignet.The object of the invention is to provide a lifting mechanism with an adjustment mechanism which can be produced cost-effectively, in particular due to a reduced number of components provided thereon, and which is ideally suited to a packaging machine for a precise height adjustment of a tool lower part of a work station provided thereon.

Diese Aufgabe wird gelöst mittels eines Hubwerks nach Anspruch 1. Vorteilhafte Weiterbildungen der Erfindung sind durch die jeweiligen Gegenstände der Unteransprüche gegeben.This object is achieved by means of a lifting mechanism according to claim 1. Advantageous further developments of the invention are given by the respective subject matters of the subclaims.

Die Erfindung bezieht sich auf ein Hubwerk zum Öffnen und Schließen einer Arbeitsstation einer Verpackungsmaschine, wobei das Hubwerk eine ortsfest gelagerte Basis, einen zur Basis entlang einer Hubachse höhenverstellbar gelagerten Hubtisch zum Tragen eines Werkzeugunterteils der Arbeitsstation, sowie einen Verstellmechanismus für den Hubtisch aufweist, der eine Antriebseinheit und eine Kniehebeleinrichtung umfasst, auf welcher der Hubtisch gelagert ist.The invention relates to a lifting mechanism for opening and closing a work station of a packaging machine, wherein the lifting mechanism has a stationary base, a lifting table which is mounted so as to be height-adjustable relative to the base along a lifting axis for supporting a tool lower part of the work station, and an adjustment mechanism for the lifting table which comprises a drive unit and a toggle lever device on which the lifting table is mounted.

Die Erfindung sieht vor, dass der Verstellmechanismus ferner ein mittels der Antriebseinheit, insbesondere entlang der Hubachse, verstellbares, mit der Kniehebeleinrichtung gekoppeltes Druckteil aufweist, anhand dessen Verlagerung die Kniehebeleinrichtung für eine Höhenverstellung des Hubtisches entlang der Hubachse betätigbar ist. Der Verstellmechanismus für den Hubtisch weist die Antriebseinheit, das damit höhenverstellbare Druckteil sowie die daran gekoppelte Kniehebeleinrichtung auf, wobei das Druckteil als Koppelglied zwischen der Antriebseinheit und der Kniehebeleinrichtung vorgesehen ist, um eine Verstellkraft der Antriebseinheit über die Kniehebeleinrichtung auf den Hubtisch zu übertragen, sodass dieser anhebbar oder absenkbar ist. Bei der Erfindung liegt die Kniehebeleinrichtung somit als Koppelgetriebe zwischen der Antriebseinheit und dem Hubtisch vor.The invention provides that the adjustment mechanism further comprises a pressure part which is adjustable by means of the drive unit, in particular along the lifting axis, and which is coupled to the toggle lever device, by means of the displacement of which the toggle lever device can be actuated to adjust the height of the lifting table along the lifting axis. The adjustment mechanism for the lifting table comprises the drive unit, the pressure part which is adjustable in height with it, and the toggle lever device coupled thereto, wherein the pressure part is provided as a coupling element between the drive unit and the toggle lever device in order to transmit an adjustment force of the drive unit to the lifting table via the toggle lever device so that the latter can be raised or lowered. In the invention, the toggle lever device is thus present as a coupling gear between the drive unit and the lifting table.

Die Verstellkraft der Antriebseinheit wirkt daher nicht unmittelbar, sondern mittelbar, d.h. über die damit verbundene Kniehebeleinrichtung, auf den Hubtisch für dessen Höhenverlagerung. Als Koppelgetriebe kann die Kniehebeleinrichtung insbesondere als Übertragungsgetriebe oder als Führungsgetriebe zwischen der Antriebseinheit und dem Hubtisch vorliegen. Damit ergibt sich die Höhenverstellung des Hubtisches aus den entlang der Hubachse resultierenden, aneinandergereihten bzw. aufeinander aufbauenden Verstellbewegungen der Antriebseinheit und der Kniehebeleinrichtung. Sowohl beim Anheben als auch beim Absenken des Hubtisches, sprich beim Schließen und Öffnen der Arbeitsstation, kann mit der Kniehebeleinrichtung vorteilhaft das Kniehebelprinzip ausgenutzt werden, beispielsweise für ein schnelles Schließen und Öffnen der Arbeitsstation, wodurch sich der Durchsatzrate an der Verpackungsmaschine steigern lässt. Ein solcher Verstellmechanismus baut ferner insgesamt kompakt, bietet eine präzise Führung und zeichnet sich insbesondere durch die Möglichkeit einer reduzierten Anzahl daran eingesetzter Komponenten zum Verstellen des Hubtisches aus, sodass das Hubwerk in Summe kostengünstig herstellbar ist.The adjustment force of the drive unit therefore does not act directly, but indirectly, i.e. via the associated toggle lever device, on the lifting table for its height adjustment. As a coupling gear, the toggle lever device can be used in particular as a transmission gear or as a Guide gear between the drive unit and the lifting table. The height adjustment of the lifting table is thus the result of the adjustment movements of the drive unit and the toggle lever device that result along the lifting axis, are sequential or build on each other. Both when raising and lowering the lifting table, i.e. when Closing and opening the work station, the knee lever principle can be used to advantage with the knee lever device, for example for quickly closing and opening the work station, which can increase the throughput rate on the packaging machine. Such an adjustment mechanism is also compact overall, offers precise guidance and is particularly characterized by the possibility of a reduced number of components used to adjust the lifting table, so that the lifting mechanism can be manufactured cost-effectively overall.

Im Gegensatz zu den bekannten Hubeinrichtungen liegt bei der Erfindung die Kniehebeleinrichtung als Koppelgetriebe, insbesondere als Übersetzungsgetriebe und/oder als Führungsgetriebe für den Hubtisch, sprich für das darauf gelagerte Werkzeugunterteil, und nicht für das Werkzeugoberteil vor. Damit kann die Verstellbewegung der Antriebseinheit mittels der Kniehebeleinrichtung gemäß dem Kniehebelprinzip auf den Hubtisch übersetzt, beispielsweise beschleunigt, werden, wodurch das Hubwerk besonders wirtschaftlich einsetzbar ist. Außerdem kann die Kniehebeleinrichtung verhindern, dass auf das Werkzeugunterteil und somit auch auf den Hubtisch wirkende Kräfte, beispielsweise eine Sieglandrückkraft, direkt auf die Antriebseinheit wirken.In contrast to the known lifting devices, the toggle lever device in the invention is a coupling gear, in particular a transmission gear and/or a guide gear for the lifting table, i.e. for the lower part of the tool mounted on it, and not for the upper part of the tool. The adjustment movement of the drive unit can thus be translated, for example accelerated, to the lifting table using the toggle lever device in accordance with the toggle lever principle, which makes the lifting mechanism particularly economical to use. In addition, the toggle lever device can prevent forces acting on the lower part of the tool and thus also on the lifting table, for example a Siegland force, from acting directly on the drive unit.

Die Erfindung sieht vor, dass die Kniehebeleinrichtung drei separate Kniehebelgelenke aufweist, die gemeinsam anhand einer Verlagerung des Druckteils betätigbar sind. Damit können die jeweiligen Kniehebelgelenke synchron zueinander verstellt werden, um den darauf gelagerten Hubtisch entlang der Hubachse gleichmäßig, d.h. ohne dass dieser zur Horizontalen verkippt, nach oben anzuheben bzw. nach unten abzusenken.The invention provides that the toggle lever device has three separate toggle lever joints that can be operated together by moving the pressure part. The respective toggle lever joints can thus be adjusted synchronously with one another in order to raise or lower the lifting table mounted on it evenly along the lifting axis, i.e. without it tipping over to the horizontal.

Die jeweiligen Kniehebelgelenke können jeweils drei Kniehebel aufweisen. Diese können miteinander an daran ausgebildeten Enden gelenkig verbunden sein. Mit den anderen Enden sind die Kniehebel an der Basis, dem Druckteil und dem Hubtisch befestigt. Demzufolge kann ein Anheben des Druckteils ein Durchstrecken zweier Kniehebel, d.h. Anheben des Hubtisches, und ein Absenken des Druckteils ein Zusammenklappen der beiden Kniehebel, d.h. Absenken des Hubtisches, bewirken.The respective toggle joints can each have three toggle levers. These can be connected to one another in an articulated manner at the ends formed thereon. The toggle levers are attached to the base, the pressure part and the lifting table at the other ends. As a result, raising the pressure part can cause two toggle levers to be extended, i.e. raising the lifting table, and lowering the pressure part can cause the two toggle levers to fold together, i.e. lowering the lifting table.

Vorstellbar ist es, dass allein die Kniehebeleinrichtung den Hubtisch trägt. Als direkter Unterbau für den Hubtisch liegt somit ausschließlich die ihn tragende Kniehebeleinrichtung vor. Damit kann das Kniehebelprinzip direkt auf den Hubtisch wirken. Dies bietet auch Vorteile für die Antriebseinheit, die als Aktuator für die Kniehebeleinrichtung vorliegt. Beispielsweise kommt diese zur Betätigung der Kniehebeleinrichtung mit kürzeren Verstellwegen aus, was zur Reduzierung der Herstellungskosten beiträgt.It is conceivable that the knee lever device alone supports the lifting table. The knee lever device that supports the lifting table is therefore the only direct substructure for the lifting table. This means that the knee lever principle can act directly on the lifting table. This also offers advantages for the drive unit, which acts as an actuator for the knee lever device. For example, this requires shorter adjustment paths to operate the knee lever device, which helps reduce manufacturing costs.

Vorzugsweise sind die Kniehebelgelenke derart in einem vorbestimmten Winkel zueinander angeordnet, dass deren gemeinsame Betätigung als eine Linearführung zum Verstellen des Hubtisches entlang der Hubachse funktioniert. Die Kniehebelgelenke sind bei dieser Variante derart konstruiert und in einem bestimmten Winkel zueinander gelagert, dass sie zusammen für den Hubtisch ein Führungsgetriebe ausbilden. Damit ist gemeint, dass allein durch das gemeinsame, zeitgleich durchgeführte Verschwenken der jeweiligen Kniehebelgelenke eine entlang der Hubachse geführte Bewegung für den Hubtisch zustande kommt, d.h. die Kniehebelgelenke selbst eine Linearführung für den Hubtisch ausbilden.Preferably, the toggle joints are arranged at a predetermined angle to one another in such a way that their joint operation functions as a linear guide for adjusting the lifting table along the lifting axis. In this variant, the toggle joints are designed and mounted at a certain angle to one another in such a way that together they form a guide gear for the lifting table. This means that simply by pivoting the respective toggle joints together at the same time, a movement along the lifting axis is achieved for the lifting table, i.e. the toggle joints themselves form a linear guide for the lifting table.

Vorteilhaft ist es, wenn die Kniehebeleinrichtung, vorzugsweise insgesamt, vier separate Kniehebelgelenke aufweist, die paarweise überkreuz in einer ersten und einer zweiten Verstellebene angeordnet sind. Die Kniehebel eines Paars der Kniehebelgelenke können in der ersten Verstellebene verschwenken und die Kniehebel des anderen Paars der Kniehebelgelenke können in der zweiten Verstellebene verschwenken. Damit ist vor allem gemeint, dass die Verstellebenen nicht parallel zueinander angeordnet sind. Folglich ergibt sich für den Hubtisch eine besonders stabile Lagerung auf der Kniehebeleinrichtung. Die Kniehebelgelenke können bei dieser Variante insbesondere derart zusammenwirken, dass der Hubtisch nur noch einen Freiheitsgrad, nämlich entlang der Hubachse, aufweist. Die beiden Verstellebenen können in einem vorbestimmten Winkel zueinander angeordnet sein, der beispielsweise 10° bis 35° oder 80° bis 100° beträgt.It is advantageous if the toggle lever device has, preferably a total of, four separate toggle lever joints, which are arranged in pairs, crossed over, in a first and a second adjustment plane. The toggle levers of one pair of toggle lever joints can pivot in the first adjustment plane and the toggle levers of the other pair of toggle lever joints can pivot in the second adjustment plane. This primarily means that the adjustment planes are not arranged parallel to one another. This results in a particularly stable mounting for the lifting table on the toggle lever device. In this variant, the toggle lever joints can work together in such a way that the lifting table only has one degree of freedom, namely along the lifting axis. The two adjustment planes can be arranged at a predetermined angle to one another, which is, for example, 10° to 35° or 80° to 100°.

Insbesondere kann vorgesehen sein, dass sich die erste und die zweite Verstellebene entlang einer Antriebsachse der Antriebseinheit schneiden. Vorzugsweise fluchten die Antriebsachse und die Hubachse miteinander, bevorzugt in vertikaler Richtung. Dies sorgt zum einen für eine Entlastung der Antriebseinheit. Anhand dieser Anordnung können außerdem die jeweiligen Kniehebelgelenke derart zusammenwirken, dass der Hubtisch nur noch einen Freiheitsgrad entlang der Hubachse aufweist. Ansonsten ergibt sich dadurch bereits eine äußerst robuste Linearführungsfunktion für den Hubtisch entlang der Hubachse, sodass auf zusätzliche, meist kostspielige Linearführungen verzichtet werden kann.In particular, it can be provided that the first and second adjustment planes intersect along a drive axis of the drive unit. Preferably, the drive axis and the lifting axis are aligned with each other, preferably in a vertical direction. On the one hand, this relieves the load on the drive unit. Using this arrangement, the respective toggle joints can also work together in such a way that the lifting table only has one degree of freedom along the lifting axis. Otherwise, this already results in an extremely robust linear guide function for the lifting table along the lifting axis, so that additional, usually expensive linear guides can be dispensed with.

Die Kniehebeleinrichtung kann gemäß einer Ausführungsvariante drei oder vier separate Kniehebelgelenke aufweisen, wobei paarweise nebeneinader angeordnete Kniehebelgelenke in jeweiligen Verstellebenen verstellbar sind, die sich entlang einer parallel zu einer Antriebsachse der Antriebseinheit verlaufenden Schnittgeraden schneiden. Dies ermöglicht eine besonders robuste Verlagerung des Hubtisches, weil dadurch automatisch eine stabile Führung für die Hubtischverlagerung zustande kommt.According to one design variant, the toggle lever device can have three or four separate toggle lever joints, whereby toggle lever joints arranged in pairs next to one another can be adjusted in respective adjustment planes that intersect along a cutting line running parallel to a drive axis of the drive unit. This enables a particularly robust displacement of the lifting table because this automatically creates a stable guide for the lifting table displacement.

Für den Fall, dass vier Kniehebelgelenke eingesetzt werden, wäre es möglich, dass ein erstes Paar aus zwei nebeneneinander angeordneten Kniehebelgelenken und ein zweites Paar aus den anderen beiden, nebeneneinander angeordneten Kniehebelgelenken gebildet wird, wobei sich die jeweiligen Verstellebenen der beiden Kniehebelgelenkpaare entlang parallel zur Antriebsachse der Antriebseinheit verlaufenden Schnittgeraden schneiden. Dadurch ist es insbesondere möglich, schwere Werkzeuge präzise mittels des Hubwerks zu verlagern. Vorzugsweise weisen die beiden Schnittgeraden den gleichen Abstand zur Antriebsachse auf. Dies sorgt für eine gleichmäßige Lastverteilung bei der Hubbewegung.If four toggle joints are used, it would be possible for a first pair to be formed from two toggle joints arranged next to each other and a second pair from the other two toggle joints arranged next to each other, with the respective adjustment planes of the two toggle joint pairs intersecting along intersection lines running parallel to the drive axis of the drive unit. This makes it possible in particular to move heavy tools precisely using the lifting mechanism. The two intersection lines are preferably the same distance from the drive axis. This ensures even load distribution during the lifting movement.

Für den Fall, dass drei Kniehebelgelenke eingesetzt werden, wäre es möglich, dass sich die jeweiligen Verstellebenen der drei Kniehebelgelenke entlang einer einzigen, parallel zur Antriebsachse der Antriebseinheit verlaufenden Schnittgeraden schneiden. Dies ergibt einen kostengünstigen Aufbau des Hubwerks. Insbesondere wäre es möglich, dass eines der drei Kniehebelgelenke derart gelagert ist, dass in dessen Verstellebene die Antriebsachse der Antriebseinheit liegt. Dadurch ergibt sich, selbst wenn nur drei Kniehebelgelenke eingesetzt werden, eine robuste, präzise geführte Verstellbarkeit des Hubwerks.If three toggle joints are used, it would be possible for the respective adjustment planes of the three toggle joints to intersect along a single intersection line running parallel to the drive axis of the drive unit. This results in a cost-effective construction of the lifting mechanism. In particular, it would be possible for one of the three toggle joints to be mounted in such a way that the drive axis of the drive unit lies in its adjustment plane. This results in robust, precisely guided adjustability of the lifting mechanism, even if only three toggle joints are used.

Vorzugsweise ist das Druckteil in Form einer Platte ausgebildet. In dieser Form weist das Druckteil eine hohe mechanische Steifigkeit auf. Als plattenförmiges Koppelglied ist das Druckteil auf geringem Bauraum, einwandfrei zur Betätigung der Kniehebeleinrichtung geeignet.Preferably, the pressure part is designed in the form of a plate. In this form, the pressure part has a high mechanical rigidity. As a plate-shaped coupling element, the pressure part is perfectly suited to actuating the toggle lever device in a small installation space.

Vorzugsweise ist die Kniehebeleinrichtung am Druckteil umfangsseitig befestigt. Das Druckteil kann damit von den jeweiligen an der Kniehebeleinrichtung vorgesehenen Kniehebelgelenken umgeben sein. Vorzugsweise kann das Druckteil in einen zwischen den Kniehebelgelenken freigelassen Raum zum Betätigen der umfangseitig daran befestigten Kniehebelgelenke eintauchen, sodass insgesamt ein höhenreduzierter Aufbau zustande kommt. Außerdem ergibt sich dadurch gleichzeitig ein stabiler Unterbau für den darauf höhenverstellbar gelagerten Hubtisch, sodass das darauf gelagerte Werkzeugunterteil große Kräfte aufnehmen kann.Preferably, the toggle lever device is attached to the pressure part on the circumference. The pressure part can thus be surrounded by the respective toggle lever joints provided on the toggle lever device. Preferably, the pressure part can be immersed in a space left free between the toggle lever joints for actuating the toggle lever joints attached to it on the circumference, so that overall a height-reduced structure is created. This also simultaneously results in a stable substructure for the lifting table mounted on it in a height-adjustable manner, so that the lower part of the tool mounted on it can absorb large forces.

Vorzugsweise weist das Druckteil eine X-förmige Kontur auf. Dadurch kann das Druckteil gewichtsreduziert hergestellt werden. Ferner kann es an seinen dadurch bereitgestellten, auswärts gerichteten Enden vorteilhafte Anbringungsorte für die Kniehebeleinrichtung zur Verfügung stellen.Preferably, the pressure part has an X-shaped contour. This allows the pressure part to be manufactured with reduced weight. Furthermore, it can provide advantageous attachment locations for the toggle lever device at its outward-facing ends provided thereby.

Eine Variante sieht vor, dass das Druckteil eine O-förmige Kontur aufweist, beispielsweise in Form einer Scheibe vorliegt. Die Scheibe könnte bevorzugt einen Durchmesser zwischen 10cm und 30cm aufweisen. Hier könnte die Kniehebeleinrichtung, sprich die jeweiligen daran vorgesehenen Kniehebelgelenke, umfangseitig an der Scheibe befestigt sein, sodass die Kniehebelgelenke zueinander Abstände aufweisen, die eine stabile Lagerung des Hubtisches begünstigen.One variant provides that the pressure part has an O-shaped contour, for example in the form of a disk. The disk could preferably have a diameter between 10cm and 30cm. Here, the toggle lever device, i.e. the respective Knee lever joints must be attached to the circumference of the disc so that the knee lever joints are spaced apart from each other to ensure stable mounting of the lifting table.

Eine Ausführungsform sieht vor, dass das Druckteil mittels der Antriebseinheit zwischen einer abgesenkten Position, in welcher das Druckteil an die Basis herangerückt positioniert ist, und einer angehobenen Position, in welcher das Druckteil von der Basis beabstandet positioniert ist, verstellbar ist. Insbesondere ist das Druckteil in vertikaler Richtung, wenn es sich in der abgesenkten Position befindet, unterhalb der Kniehebeleinrichtung positioniert, wobei es in der angehobenen Position inmitten der Kniehebeleinrichtung positioniert ist, d.h. zwischen den daran vorgesehenen Kniehebelgelenken. Außer einer kompakten Bauart kommt dadurch auch eine besonders gleichmäßige Betätigungskraft auf die umliegenden Kniehebelgelenke zustande.One embodiment provides that the pressure part can be adjusted by means of the drive unit between a lowered position in which the pressure part is positioned closer to the base and a raised position in which the pressure part is positioned at a distance from the base. In particular, the pressure part is positioned vertically below the toggle lever device when it is in the lowered position, and in the raised position it is positioned in the middle of the toggle lever device, i.e. between the toggle lever joints provided thereon. In addition to a compact design, this also results in a particularly uniform actuating force on the surrounding toggle lever joints.

Eine Ausführungsform der Erfindung sieht vor, dass das Druckteil in der abgesenkten Position unterhalb von an der Basis für die Kniehebelgelenke vorgesehenen unteren Anbringungslagern positioniert ist und/oder das Druckteil in der angehobenen Position oberhalb der an der Basis für die Kniehebeleinrichtung vorgesehenen unteren Anbringungslagern positioniert ist. Dies schafft ein besonders günstiges Kraft-Bewegungs-Übersetzungsverhältnis, das anhand der Kniehebeleinrichtung, in Abhängigkeit des damit erzeugten Kniehebelprinzips, auf den Hubtisch für dessen Höhenverstellung ausgeübt wird.One embodiment of the invention provides that the pressure part in the lowered position is positioned below the lower mounting bearings provided on the base for the toggle joints and/or the pressure part in the raised position is positioned above the lower mounting bearings provided on the base for the toggle device. This creates a particularly favorable force-motion transmission ratio that is exerted on the lifting table for its height adjustment by means of the toggle device, depending on the toggle principle generated thereby.

Vorzugsweise ist die Kniehebeleinrichtung zwischen einer eingeklappten Stellung und einer gestreckten Stellung bewegbar, in welcher obere, am Hubtisch für die Kniehebeleinrichtung vorgesehene Anbringungslager einen anderen, insbesondere einen geringeren oder größeren, Abstand zueinander aufweisen als untere, an der Basis für die Kniehebeleinrichtung vorgesehene Anbringungslager. Dadurch wird der Hubtisch spielfrei entlang der Hubachse geführt. Eine gesonderte Führung ist nicht notwendig. Die Kniehebeleinrichtung wirkt hier als Zentrierungseinheit, um ein Verkippen des Hubtisches zu vermeiden. Vor allen Dingen können die jeweiligen Abstände der oberen und unteren Anbringungslager so ausgewählt werden, dass ein naturgemäß vorliegendes Spiel in den Kniehebelgelenken eine vernachlässigbare Auswirkung hat. Durch die Zentrierungsfunktion kann insbesondere sichergestellt werden, dass der Hubtisch bei jedem Hub an der gleichen Position zum Stehen kommt. Dies kann insbesondere dann von großer Bedeutung sein, wenn das auf dem Hubtisch gelagerte Werkzeugunterteil für einen Siegelvorgang mit dem darüber gelagerten Werkzeugoberteil zusammengeführt wird, weil dabei höchste Präzision gefragt ist, um eine millimetergenaue Siegelnaht herzustellen.Preferably, the toggle lever device is movable between a folded position and an extended position, in which upper attachment bearings provided on the lifting table for the toggle lever device have a different, in particular a smaller or larger, distance from each other than lower attachment bearings provided on the base for the toggle lever device. As a result, the lifting table is guided along the lifting axis without play. A separate guide is not necessary. The toggle lever device acts here as a centering unit to prevent the lifting table from tipping over. Above all, the respective distances between the upper and lower attachment bearings can be selected in such a way that any naturally occurring play in the toggle lever joints has a negligible effect. The centering function can in particular ensure that the lifting table comes to a stop in the same position with each lift. This can be of great importance in particular when the lower part of the tool stored on the lifting table is brought together with the upper part of the tool stored above it for a sealing process, because this requires the utmost precision in order to produce a sealing seam that is accurate to the millimeter.

Es ist möglich, die Kniehebeleinrichtung, insbesondere die daran ausgebildeten Kniehebelgelenke, derart zu dimensionieren, dass der darauf gelagerte Hubtisch während einer Hubbewegung zumindest horizontal ausgerichtet bleibt. Damit lässt sich das auf dem Hubtisch gelagerte Werkzeugunterteil zielgenauer mit einem darüber angeordneten Werkzeugoberteil zusammenführen, um dazwischen einen Verpackungsprozess, beispielsweise einen Tiefziehvorgang oder einen Siegelvorgang, durchzuführen.It is possible to dimension the toggle lever device, in particular the toggle lever joints formed thereon, in such a way that the lifting table mounted thereon during a lifting movement remains at least horizontally aligned. This allows the lower part of the tool stored on the lifting table to be brought together more precisely with an upper part of the tool arranged above it in order to carry out a packaging process in between, for example a deep-drawing process or a sealing process.

Gemäß einer Ausführungsform ist das Druckteil entlang der Hubachse linear geführt verstellbar. Dadurch können die um das Druckteil herum angeordneten, daran befestigten Kniehebelgelenke präzise betätigt werden, um den darauf gelagerten Hubtisch entlang der Hubachse zu verstellen.According to one embodiment, the pressure part is adjustable in a linear manner along the lifting axis. This allows the toggle joints arranged around the pressure part and attached to it to be operated precisely in order to adjust the lifting table mounted on it along the lifting axis.

Eine besonders kostengünstig herstellbare Variante kann dadurch bereitgestellt werden, dass das Druckteil antriebsseitig einzig durch einen ein- und ausfahrbaren Kolben der Antriebseinheit entlang der Hubachse geführt ist. Damit ist gemeint, dass keine weitere Linearführung der Antriebseinheit zugeordnet ist, um das damit verstellbare Druckteil zu führen.A particularly cost-effective variant can be provided by guiding the pressure part on the drive side along the stroke axis solely by a retractable and extendable piston of the drive unit. This means that no further linear guide is assigned to the drive unit to guide the pressure part that can be adjusted with it.

Insbesondere kann die Kniehebeleinrichtung derart konfiguriert sein, dass die Kniehebelgelenke, die umfangseitig am Druckteil angeordnet sind, dasselbe auf der Hubachse halten. Die Kniehebelgelenke geben dabei während einer Verstellbewegung des Druckteils diesem gleichzeitig von außen Halt, damit es entlang der Hubachse positioniert bleibt. Die Kolbenstange und die Kniehebelgelenke bieten damit zusammen eine Art Kaskaden-Führung für das Druckteil und insbesondere für den Hubtisch. Damit kann auf gesonderte Linearführungen verzichtet werden.In particular, the toggle lever device can be configured in such a way that the toggle lever joints, which are arranged on the circumference of the pressure part, hold it on the lifting axis. During an adjustment movement of the pressure part, the toggle lever joints simultaneously provide support to the pressure part from the outside so that it remains positioned along the lifting axis. The piston rod and the toggle lever joints together thus provide a type of cascade guide for the pressure part and in particular for the lifting table. This means that separate linear guides are not required.

Zum Höhenverstellen großer, schwerer Werkzeugunterteile kann das Hubwerk mindestens eine gesonderte Linearführung für das Druckteil aufweisen. Vorstellbar wäre es, mindestens eine neben der Antriebseinheit auf der Basis montierte Linearführung vorzusehen, wodurch eine lineare Ausfahrbewegung des Kolbens der Antriebseinheit unterstützt werden kann.To adjust the height of large, heavy tool bases, the lifting mechanism can have at least one separate linear guide for the pressure part. It would be conceivable to provide at least one linear guide mounted on the base next to the drive unit, which can support a linear extension movement of the piston of the drive unit.

Zweckmäßig ist es, dass die Antriebseinheit als Pneumatikzylinder oder Elektrozylinder ausgebildet ist. Diese nehmen am Hubwerk wenig Platz ein und sind kostengünstig herstellbar. Bevorzugt kommt lediglich ein einziger Pneumatikzylinder oder Elektrozylinder zum Einsatz.It is practical for the drive unit to be designed as a pneumatic cylinder or electric cylinder. These take up little space on the lifting gear and are inexpensive to manufacture. Preferably, only a single pneumatic cylinder or electric cylinder is used.

Besonders eignet sich das erfindungsgemäße Hubwerk zum Einsatz an einer Tiefziehverpackungsmaschine oder an einer Schalenverschließmaschine, insbesondere als Hubwerk für eine daran ausgebildete Siegelstation, um ein daran vorgesehenes Siegelwerkzeugunterteil mit einem darüber angeordneten Siegelwerkzeugoberteil für einen dazwischen durchführbaren Siegelvorgang zusammenzuführen.The lifting mechanism according to the invention is particularly suitable for use on a thermoforming packaging machine or on a tray sealing machine, in particular as a lifting mechanism for a sealing station formed thereon, in order to bring together a sealing tool lower part provided thereon with a sealing tool upper part arranged above it for a sealing process that can be carried out between them.

Im Folgenden wird die Erfindung anhand von in den Figuren dargestellten Ausführungsbeispielen genauer erläutert. Im Einzelnen zeigen:

Fig. 1
eine perspektivische Ansicht einer Tiefziehverpackungsmaschine,
Fig. 2
eine perspektivische Ansicht einer Schalenverschließmaschine,
Fig. 3A
ein erfindungsgemäßes Hubwerk in geöffneter Stellung,
Fig. 3B
das erfindungsgemäßes Hubwerk in einer geschlossenen Stellung,
Fig. 4
eine Draufsichtdarstellung der Kniehebelgelenke gemäß einer ausführungsgemäßen Anordnung,
Fig. 5
eine Draufsichtdarstellung der Kniehebelgelenke gemäß einer weiteren ausführungsgemäßen Anordnung, und
Fig. 6
eine Draufsichtdarstellung der Kniehebelgelenke gemäß einer weiteren ausführungsgemäßen Anordnung.
The invention is explained in more detail below using exemplary embodiments shown in the figures. In detail:
Fig.1
a perspective view of a thermoforming packaging machine,
Fig.2
a perspective view of a tray sealing machine,
Fig. 3A
a lifting mechanism according to the invention in the open position,
Fig. 3B
the lifting mechanism according to the invention in a closed position,
Fig.4
a top view of the toggle joints according to an embodiment,
Fig.5
a top view of the toggle joints according to a further embodiment, and
Fig.6
a top view of the toggle joints according to another embodiment.

Gleiche Komponenten sind in den Figuren durchgängig mit gleichen Bezugszeichen versehen.Identical components are provided with the same reference numerals throughout the figures.

Figur 1 zeigt in einer perspektivischen Ansicht eine intermittierend arbeitende Tiefziehverpackungsmaschine 1. Diese Tiefziehverpackungsmaschine 1 weist eine Formstation 2, eine Siegelstation 3, eine Querschneideeinrichtung 4 und Längsschneideeinrichtung 5 auf, die in dieser Reihenfolge in einer Transportrichtung R an einem Maschinengestell 6 angeordnet sind. Eingangsseitig befindet sich an dem Maschinengestell 6 eine Zufuhrrolle 7, von der eine Unterfolie 8 abgezogen wird. Ferner weist die Tiefziehverpackungsmaschine 1 eine Transportkette 11 auf, die die Unterfolie 8 ergreift, und diese pro Hauptarbeitstakt in der Transportrichtung R weitertransportiert, insbesondere beidseitig angeordnete Transportketten bzw. Klammerketten 11. Figure 1 shows a perspective view of an intermittently operating thermoforming packaging machine 1. This thermoforming packaging machine 1 has a forming station 2, a sealing station 3, a cross-cutting device 4 and a longitudinal cutting device 5, which are arranged in this order in a transport direction R on a machine frame 6. On the input side, there is a feed roller 7 on the machine frame 6, from which a bottom film 8 is pulled off. The thermoforming packaging machine 1 also has a transport chain 11, which grips the bottom film 8 and transports it further in the transport direction R per main work cycle, in particular transport chains or clamp chains 11 arranged on both sides.

In der dargestellten Ausführungsform ist die Formstation 2 als eine Tiefziehstation ausgebildet, bei der in die Unterfolie 8 durch Tiefziehen, beispielsweise mittels Druckluft und/oder Vakuum, Mulden geformt werden. Dabei kann die Formstation 2 derart ausgebildet sein, dass in der Richtung senkrecht zur Transportrichtung R mehrere Mulden nebeneinander gebildet werden. In Transportrichtung R hinter der Formstation 2 ist eine Einfüllstrecke 12 vorgesehen, in der die in der Unterfolie 8 geformten Mulden mit Produkten befüllt werden.In the embodiment shown, the forming station 2 is designed as a deep-drawing station in which troughs are formed in the bottom film 8 by deep-drawing, for example by means of compressed air and/or vacuum. The forming station 2 can be designed in such a way that several troughs are formed next to one another in the direction perpendicular to the transport direction R. In the transport direction R behind the forming station 2, a filling section 12 is provided in which the troughs formed in the bottom film 8 are filled with products.

Die Siegelstation 3 verfügt über eine hermetisch verschließbare Kammer 3a, in der die Atmosphäre in den Mulden vor dem Versiegeln mit der von einer Oberfolienaufnahme 9 abgegebenen Oberfolie 10 z.B. evakuiert und/oder durch Gasspülen mit einem Austauschgas oder mit einem Gasgemisch ersetzt werden kann.The sealing station 3 has a hermetically sealable chamber 3a in which the atmosphere in the troughs can be evacuated, for example, and/or replaced by gas flushing with a replacement gas or with a gas mixture before sealing with the upper film 10 released from an upper film holder 9.

Die Querschneideinrichtung 4 kann als Stanze ausgebildet sein, die die Unterfolie 8 und die Oberfolie 10 in einer Richtung quer zur Transportrichtung R zwischen benachbarten Mulden durchtrennt. Dabei arbeitet die Querschneideeinrichtung 4 derart, dass die Unterfolie 8 nicht über die gesamte Breite aufgetrennt wird, sondern zumindest in einem Randbereich nicht durchtrennt wird. Dies ermöglicht einen kontrollierten Weitertransport durch die Transportkette 11.The cross-cutting device 4 can be designed as a punch that cuts the bottom film 8 and the top film 10 in a direction transverse to the transport direction R between adjacent troughs. The cross-cutting device 4 works in such a way that the bottom film 8 is not cut across the entire width, but is not cut at least in one edge area. This enables controlled further transport through the transport chain 11.

Die Längsschneideeinrichtung 5 kann als eine Messeranordnung ausgebildet sein, mit der die Unterfolie 8 und die Oberfolie 10 zwischen benachbarten Mulden und am seitlichen Rand der Unterfolie 8 in der Transportrichtung R durchtrennt werden, sodass hinter der Längsschneideeinrichtung 5 vereinzelte Verpackungen vorliegen.The longitudinal cutting device 5 can be designed as a knife arrangement with which the lower film 8 and the upper film 10 are severed between adjacent troughs and at the lateral edge of the lower film 8 in the transport direction R, so that individual packages are present behind the longitudinal cutting device 5.

Die rechten und linken Transportketten 11 der Tiefziehverpackungsmaschine 1, die die Unterfolie 8 beidseitig ergreifen, werden jeweils in einer Kettenführung 13 geführt. Diese Kettenführungen 13 sind nach außen hin jeweils von einer Seitenverkleidung 14 der Tiefziehverpackungsmaschine 1 geschützt und ggf. an der Seitenverkleidung 14 befestigt. Die Seitenverkleidung 14 kann ein Blechteil sein.The right and left transport chains 11 of the thermoforming packaging machine 1, which grip the bottom film 8 on both sides, are each guided in a chain guide 13. These chain guides 13 are each protected on the outside by a side panel 14 of the thermoforming packaging machine 1 and, if necessary, are attached to the side panel 14. The side panel 14 can be a sheet metal part.

Die Tiefziehverpackungsmaschine 1 verfügt ferner über eine Steuerung 19. Sie hat die Aufgabe, die in der Tiefziehverpackungsmaschine 1 ablaufenden Prozesse zu steuern und zu überwachen. Eine Anzeigevorrichtung 20a mit Bedienelementen 20b dient zum Visualisieren bzw. Beeinflussen der Prozessabläufe in der Tiefziehverpackungsmaschine 1 für bzw. durch einen Bediener.The thermoforming packaging machine 1 also has a control system 19. Its task is to control and monitor the processes taking place in the thermoforming packaging machine 1. A display device 20a with operating elements 20b is used to visualize or influence the process sequences in the thermoforming packaging machine 1 for or by an operator.

Figur 2 zeigt eine Schalenverschließmaschine 15, die in Fachkreisen auch "Traysealer" genannt wird. Diese Schalenverschließmaschine 15 weist ein Zuführband 16, eine Siegelstation 17 und ein Abführband 18 auf, die in dieser Reihenfolge in der Transportrichtung R an einem Maschinengestell 21 angeordnet sind. Ferner umfasst die Schalenverschließmaschine 15 eine Greifereinrichtung 22, mittels welcher vorgefertigte Schalen S vom Zuführband 16 abgeholt und die Siegelstation 17 für einen darin stattfindenden Siegelprozess transportiert werden können. Ferner ist die Greifereinrichtung 22 dazu ausgebildet, innerhalb der Siegelstation 17 versiegelte Schalen S zu ergreifen und ans Abführband 18 für einen darauf stattfindenden Abtransport abzugeben. Die innerhalb der Siegelstation 22 positionierten unversiegelten Schalen S können mittels einer durch die Siegelstation 22 durchgeführten Oberfolie 23 versiegelt werden. Figure 2 shows a tray sealing machine 15, which is also called a "tray sealer" in technical circles. This tray sealing machine 15 has a feed belt 16, a sealing station 17 and a discharge belt 18, which are arranged in this order in the transport direction R on a machine frame 21. The tray sealing machine 15 also comprises a gripper device 22, by means of which prefabricated trays S can be picked up from the feed belt 16 and transported to the sealing station 17 for a sealing process taking place therein. The gripper device 22 is also designed to grip sealed trays S within the sealing station 17 and to deliver them to the discharge belt 18 for removal thereon. The unsealed trays S positioned within the sealing station 22 can be sealed by means of a top film 23 passed through the sealing station 22.

Figur 3A zeigt ein Hubwerk 24 zum Öffnen und Schließen einer Arbeitsstation einer Verpackungsmaschine. Die Arbeitsstation kann beispielsweise als Siegelstation 3 der in Figur 1 gezeigten Tiefziehverpackungsmaschine 1 oder als Siegelstation 17 der in Figur 2 gezeigten Schalenverschließmaschine 15 vorliegen. Figure 3A shows a lifting mechanism 24 for opening and closing a work station of a packaging machine. The work station can, for example, be used as a sealing station 3 of the Figure 1 shown thermoforming packaging machine 1 or as sealing station 17 of the in Figure 2 shown tray sealing machine 15.

In Figur 3A ist das Hubwerk 24 in einer geöffneten Stellung S1 dargestellt. Das Hubwerk 24 verfügt über eine Basis 25, einen zur Basis 25 entlang einer Hubachse H höhenverstellbar gelagerten Hubtisch 26, auf welchem ein Werkzeugunterteil 27, das in Form einer Schalenaufnahme 31 vorliegt, positioniert ist. Weiter umfasst das Hubwerk 24 einen Verstellmechanismus 28, der eine Antriebseinheit 29 und eine Kniehebeleinrichtung 30 aufweist. In Figur 3A ist die Schalenaufnahme 31 zur Aufnahme von Mulden ausgebildet, die entlang der Tiefziehverpackungsmaschine 1 geformt werden.In Figure 3A the lifting mechanism 24 is shown in an open position S1. The lifting mechanism 24 has a base 25, a lifting table 26 which is mounted so that it can be adjusted in height relative to the base 25 along a lifting axis H and on which a tool base 27, which is in the form of a shell holder 31, is positioned. The lifting mechanism 24 also comprises an adjustment mechanism 28 which has a drive unit 29 and a toggle lever device 30. In Figure 3A the tray holder 31 is designed to receive troughs that are formed along the thermoforming packaging machine 1.

Mittels des Hubwerks 24 kann das Werkzeugunterteil 27 mit einem darüber angeordneten Werkzeugoberteil 32 für einen Verpackungsprozess zusammengeführt werden, beispielsweise für einen Siegelvorgang. Das Hubwerk 24 ist beidseitig an einem Maschinenrahmen 33 befestigt. Die Basis 25 des Hubwerks 24 ist anhand von Tragstangen 34 mit dem Maschinenrahmen 33 verbunden, d.h. relativ zum Maschinenrahmen 33 ortsfest gelagert. Während des Betriebs des Hubwerks 24, sprich beim abwechselnden Anheben und Absenken des Hubtisches 26, bleibt die Basis 25 ortsfest gelagert.By means of the lifting mechanism 24, the lower tool part 27 can be brought together with an upper tool part 32 arranged above it for a packaging process, for example for a sealing process. The lifting mechanism 24 is attached to a machine frame 33 on both sides. The base 25 of the lifting mechanism 24 is connected to the machine frame 33 by means of support rods 34, i.e. is mounted in a stationary manner relative to the machine frame 33. During operation of the lifting mechanism 24, i.e. when the lifting table 26 is alternately raised and lowered, the base 25 remains mounted in a stationary manner.

An unteren Enden der Tragstangen 34 sind quer zur Transportrichtung R zwei Träger 35 befestigt. Auf den beiden Trägern 35 ist eine Basisplatte 36 montiert. Die Tragstangen 34, die beiden Träger 35 sowie die daran befestigte Basisplatte 36 bilden am Maschinenrahmen 33 befestigt eine tragfähige Basis 25 aus.Two supports 35 are attached to the lower ends of the support rods 34 transversely to the transport direction R. A base plate 36 is mounted on the two supports 35. The support rods 34, the two supports 35 and the base plate 36 attached to them form a load-bearing base 25 attached to the machine frame 33.

Weiter zeigt Figur 3A, dass die Antriebseinheit 29 an der Basisplatte 36 befestigt ist. In Figur 3A ist die Antriebseinheit 29 als Kolbenzylindereinheit 37 ausgebildet. Die Kolbenzylindereinheit 37 ist beispielsweise ein Pneumatikzylinder oder ein Elektrozylinder, der für eine Verstellung des Hubtisches 26 entlang der Hubachse H vorgesehen ist.Next shows Figure 3A that the drive unit 29 is attached to the base plate 36. In Figure 3A the drive unit 29 is designed as a piston-cylinder unit 37. The piston-cylinder unit 37 is, for example, a pneumatic cylinder or an electric cylinder, which is provided for adjusting the lifting table 26 along the lifting axis H.

Figur 3A zeigt auch, dass der Verstellmechanismus 28 ein mittels der Antriebseinheit 29 entlang der Hubachse H verstellbares, mit der Kniehebeleinrichtung 30 gekoppeltes Druckteil 38 aufweist, anhand dessen Verlagerungen entlang der Hubachse H die Kniehebeleinrichtung 30 für eine Höhenverstellung des Hubtisches 26 betätigbar ist. Figure 3A also shows that the adjustment mechanism 28 has a pressure part 38 which is adjustable along the lifting axis H by means of the drive unit 29 and coupled to the toggle lever device 30, by means of whose displacements along the lifting axis H the toggle lever device 30 can be actuated for a height adjustment of the lifting table 26.

Figur 3B zeigt das Hubwerk 24 in einer geschlossenen Stellung S2, in welcher das Werkzeugunterteil 27 und das Werkzeugoberteil 32 zusammengeführt sind. Dafür wurde das in Figur 3A in einer abgesenkten Position P1 dargestellte Druckteil 38, in welcher es an die Basisplatte 36 herangerückt positioniert ist, in die in Figur 3B dargestellte angehobene Position P2, in welcher das Druckteil 38 von der Basisplatte 36 beabstandet positioniert ist, verstellt. In Figur 3B ist die Kniehebeleinrichtung 30 im Vergleich zu einer in Figur 3A gezeigten eingeklappten Stellung M1 nun in eine gestreckte Stellung M2 verstellt. Figure 3B shows the lifting mechanism 24 in a closed position S2, in which the lower tool part 27 and the upper tool part 32 are brought together. For this purpose, the Figure 3A in a lowered position P1 shown pressure part 38, in which it is positioned close to the base plate 36, in the Figure 3B shown raised position P2, in which the Pressure part 38 is positioned at a distance from the base plate 36. In Figure 3B The toggle lever device 30 is compared to a Figure 3A The folded position M1 shown is now adjusted to a stretched position M2.

In Figur 3B ist gut zu sehen, dass die Kniehebeleinrichtung 30 vier separate Kniehebelgelenke 39a, 39b, 39c und 39d (im Folgenden: Kniehebelgelenke 39a bis 39d) aufweist. Die Kniehebelgelenke 39a bis 39d sind paarweise überkreuz in einer ersten und in einer zweiten Verstellebene E1, E2 angeordnet. Insbesondere lassen sich die jeweiligen Kniehebel der beiden Kniehebelgelenke 39a und 39c in der Verstellebene E1 und die jeweiligen Kniehebel der anderen beiden Kniehebelgelenke 39b und 39d in der Verstellebene E2 verschwenken. Die beiden Verstellebenen E1, E2 sind zueinander in einem vorbestimmten Winkel α angeordnet. Der Winkel α liegt als spitzer Winkel vor und beträgt beispielsweise 20°. Gemäß Figur 3B schneiden sich die beiden Verstellebenen E1, E2 entlang einer Antriebsachse A der Antriebseinheit 29.In Figure 3B it is clearly visible that the toggle lever device 30 has four separate toggle lever joints 39a, 39b, 39c and 39d (hereinafter: toggle lever joints 39a to 39d). The toggle lever joints 39a to 39d are arranged in pairs, crossing each other, in a first and a second adjustment plane E1, E2. In particular, the respective toggle levers of the two toggle lever joints 39a and 39c can be pivoted in the adjustment plane E1 and the respective toggle levers of the other two toggle lever joints 39b and 39d can be pivoted in the adjustment plane E2. The two adjustment planes E1, E2 are arranged at a predetermined angle α to each other. The angle α is an acute angle and is, for example, 20°. According to Figure 3B the two adjustment planes E1, E2 intersect along a drive axis A of the drive unit 29.

Figur 3B zeigt auch, dass die Kolbenzylindereinheit 37 einen ausfahrbaren Kolben 40 aufweist, der entlang der Antriebsachse A verstellbar ist, welche mit der Hubachse H fluchtet. Das an einem oberen Ende des Kolbens 40 befestigte Druckteil 38 bewirkt anhand seiner Verlagerung entlang der Antriebsachse A, dass sich die Kniehebeleinrichtung 30 zwischen der eingeklappten Stellung M1 aus Figur 3A und der gestreckten Stellung M2 der Figur 3B bewegt. Die Kniehebelgelenke 39a bis 39d der Kniehebeleinrichtung 30 können damit synchron verstellt werden, um den darauf gelagerten Hubtisch 26 entlang der Hubachse H zu bewegen. Figure 3B also shows that the piston-cylinder unit 37 has an extendable piston 40 which is adjustable along the drive axis A, which is aligned with the lifting axis H. The pressure part 38 attached to an upper end of the piston 40 causes, by means of its displacement along the drive axis A, that the toggle lever device 30 moves between the folded-in position M1 from Figure 3A and the extended position M2 of the Figure 3B The toggle lever joints 39a to 39d of the toggle lever device 30 can thus be adjusted synchronously in order to move the lifting table 26 mounted thereon along the lifting axis H.

Figur 3B zeigt auch, dass in der gestreckten Stellung M2 der Kniehebeleinrichtung 30 obere Anbringungslager 41a, 41b einen Abstand a zueinander aufweisen. Ferner zeigt Figur 3B, dass untere, an der Basis 25 für die Kniehebeleinrichtung 30 vorgesehene Anbringungslager 42a, 42b einen Abstand b zueinander aufweisen. Der in Figur 3B gezeigte Abstand a der oberen Anbringungslager 41a, 41b ist kleiner als der zwischen den unteren Anbringungslagern 42a, 42b vorliegende Abstand b. Anhand dieser Konfiguration, d.h. anhand der unterschiedlichen Abstände a, b, ergibt sich während des Anhebens des Druckteils 38 über die Kniehebeleinrichtung 30 eine Zentrierungsfunktion für den damit verstellbaren Hubtisch 26, sodass dieser bei jedem Hub an einer vorbestimmten Position zum Stehen kommt, d.h. das darauf positionierte Werkzeugunterteil 27 bei jedem Hub präzise mit dem darüber angeordneten Werkzeugoberteil 32 zusammenführt. Figure 3B also shows that in the extended position M2 of the toggle lever device 30, upper mounting bearings 41a, 41b have a distance a from each other. Furthermore, Figure 3B that lower mounting bearings 42a, 42b provided on the base 25 for the toggle lever device 30 have a distance b from each other. The Figure 3B The distance a shown between the upper mounting bearings 41a, 41b is smaller than the distance b between the lower mounting bearings 42a, 42b. Based on this configuration, ie based on the different distances a, b, a centering function is provided for the lifting table 26, which can be adjusted thereby, during the lifting of the pressure part 38 via the toggle lever device 30, so that it comes to a stop at a predetermined position with each stroke, ie the lower tool part 27 positioned thereon is brought together precisely with the upper tool part 32 arranged above it with each stroke.

In den Figuren 3A und 3B ist auf der Basisplatte 36 eine neben der Kolbenzylindereinheit 37 positionierte Linearführung 43 vorgesehen. Eine solche Linearführung 43 könnte auf der Basisplatte 36 auch in doppelter Ausführung auf gegenüberliegenden Seiten des Kolbens 40 vorgesehen sein. Nichtsdestotrotz funktioniert der Verstellmechanismus 28 auch ohne die gesonderte Linearführung 43. Dabei ergibt sich eine geführte Höhenverstellung des Hubtisches 26 entlang der Hubachse H alleinig durch den entlang der Antriebsachse A ausfahrbaren Kolben 40 der Kolbenzylindereinheit 37 und die jeweiligen Kniehebelgelenke 39a bis 39d.In the Figures 3A and 3B a linear guide 43 positioned next to the piston-cylinder unit 37 is provided on the base plate 36. Such a linear guide 43 could also be provided on the base plate 36 in duplicate on opposite sides of the piston 40. Nevertheless, the adjustment mechanism 28 also functions without the separate linear guide 43. This results in a guided height adjustment of the lifting table 26 along the lifting axis H solely by the piston 40 of the piston-cylinder unit 37, which can be extended along the drive axis A, and the respective toggle lever joints 39a to 39d.

Figur 4 zeigt die in Figur 3B gelagerte Kniehebeleinrichtung 30 aus der Draufsicht. Die durch die beiden Verstellebenen E1, E2 gebildete Schnittgerade entspricht hier der Antriebsachse A der Antriebseinheit 29. Die beiden Verstellebenen E1, E2 schneiden sich im Winkel α. Der Winkel α beträgt insbesondere 80° bis 100°. Figure 4 shows the Figure 3B mounted toggle lever device 30 from above. The intersection line formed by the two adjustment planes E1, E2 corresponds here to the drive axis A of the drive unit 29. The two adjustment planes E1, E2 intersect at an angle α. The angle α is in particular 80° to 100°.

Figur 5 zeigt eine andere Anordnung der vier Kniehebelgelenke 39a bis 39d. Die Kniehebelgelenke 39a bis 39d sind in jeweiligen Verstellebenen Ea, Eb, Ec, Ed verstellbar gelagert. Die beiden Verstellebenen Eb, Ec der Kniehebelgelenke 39b, 39c schneiden sich in einer Schnittgeraden B. Die beiden Verstellebenen Ea, Ed der Kniehebelgelenke 39a, 39d schneiden sich in einer Schnittgeraden C. Die beiden Schnittgeraden B, C verlaufen parallel zur Antriebsachse A der Antriebseinheit 29. Ferner zeigt Figur 5, dass die beiden Schnittgeraden B, C äquidistant zur Antriebsachse A verlaufen. Dies ermöglicht eine besonders robuste Verlagerung des Hubtisches 26, weil für diesen dadurch automatisch eine stabile Führung zustande kommt. Die jeweiligen Schnittgeradenpaare Ea, Ed und Eb, Ec schneiden sich insbesondere jeweils in einem Winkel, der 80° bis 100° beträgt. Figure 5 shows a different arrangement of the four toggle joints 39a to 39d. The toggle joints 39a to 39d are adjustably mounted in the respective adjustment planes Ea, Eb, Ec, Ed. The two adjustment planes Eb, Ec of the toggle joints 39b, 39c intersect in a straight line B. The two adjustment planes Ea, Ed of the toggle joints 39a, 39d intersect in a straight line C. The two straight lines B, C run parallel to the drive axis A of the drive unit 29. Furthermore, Figure 5 that the two intersection lines B, C run equidistant from the drive axis A. This enables a particularly robust displacement of the lifting table 26, because this automatically creates a stable guide for it. The respective pairs of intersection lines Ea, Ed and Eb, Ec intersect in particular at an angle of 80° to 100°.

Figur 6 zeigt aus der Draufsicht die beiden Kniehebelgelenke 39b, 39c gemäß der Anordnung aus Figur 5. Weiter zeigt Figur 6 ein drittes Kniehebelgelenk 39e, das die beiden in Figur 5 gezeigten Kniehebelgelenke 39a, 39b ersetzt. Diese drei Kniehebelgelenke 39b, 39c, 39e weisen Verstellebenen Eb, Ec, Ee auf, die sich entlang einer einzigen, parallel zur Antriebsachse A der Antriebseinheit 29 verlaufenden Schnittgeraden D schneiden. Dabei ist das Kniehebelgelenk 39e derart gelagert, dass in dessen Verstellebene Ee die Antriebsachse A der Antriebseinheit 29 liegt. Dadurch ergibt sich, selbst wenn nur die drei Kniehebelgelenke 39b, 39c, 39e eingesetzt werden, eine robuste, präzise geführte Verstellbarkeit für Hubtisch 26. Die Anordnung der jeweiligen Kniehebelgelenke 39b, 39c, 39e könnte derart sein, dass sich deren drei Verstellebenen Eb, Ec, Ee zueinander jeweils in einem 120°-Winkel schneiden. Figure 6 shows the two toggle joints 39b, 39c from above according to the arrangement of Figure 5 . Next shows Figure 6 a third knee joint 39e, which connects the two Figure 5 shown toggle joints 39a, 39b. These three toggle joints 39b, 39c, 39e have adjustment planes Eb, Ec, Ee that intersect along a single intersection line D that runs parallel to the drive axis A of the drive unit 29. The toggle joint 39e is mounted in such a way that the drive axis A of the drive unit 29 lies in its adjustment plane Ee. This results in robust, precisely guided adjustability for the lifting table 26, even if only the three toggle joints 39b, 39c, 39e are used. The arrangement of the respective toggle joints 39b, 39c, 39e could be such that their three adjustment planes Eb, Ec, Ee intersect each other at an angle of 120°.

Claims (14)

  1. Lifting gear (24) for opening and closing a workstation of a packaging machine, wherein the lifting gear (24) includes a stationarily mounted base (25), a lifting platform (26) mounted to be height adjustable with respect to the base (25) along a lifting axis (H) for supporting a lower tool part (27) of the workstation, and an adjusting mechanism (28) comprising a drive unit (29) and a toggle means (30) on which the lifting platform (26) is mounted, wherein the adjusting mechanism (28) furthermore includes a pressure part (38) coupled with the toggle means (30) and adjustable by means of the drive unit (29), wherein by the displacement of said pressure part (38), the toggle means (30) is actuatable for a height adjustment of the lifting platform (26) along the lifting axis (H), characterized in that the toggle means (30) includes at least three separate toggle joints (39a to 39d) which are actuatable together by means of a displacement of the pressure part (38).
  2. Lifting gear according to claim 1, characterized in that the toggle joints (39a to 39d) are arranged at a predetermined angle (α) with respect to each other such that their common actuation functions as a linear guide for adjusting the lifting platform (26) along the lifting axis (H).
  3. Lifting gear according to one of the preceding claims, characterized in that the toggle means (30) includes four separate toggle joints (39a to 39d) which are arranged in pairs cross-over in a first and a second adjusting planes (E1, E2).
  4. Lifting gear according to claim 3, characterized in that the first and the second adjusting planes (E1, E2) intersect along a drive axis (A) of the drive unit (29).
  5. Lifting gear according to one of the preceding claims, characterized in that the toggle means (30) includes three or four separate toggle joints (39a to 39e), wherein toggle joints (39a to 39e) arranged in pairs next to each other are adjustable in respective adjusting planes (Ea, Eb, Ec, Ed, Ee) which intersect along an intersection line (B, C, D) extending in parallel to a drive axis (A) of the drive unit (29).
  6. Lifting gear according to one of the preceding claims, characterized in that the pressure part (38) is present in the form of a plate and/or has an X-shaped or O-shaped contour.
  7. Lifting gear according to claim 6, characterized in that the toggle means (30) is circumferentially fixed to the plate.
  8. Lifting gear according to one of the preceding claims, characterized in that the pressure part (38) is adjustable, by means of the drive unit (29), between a lowered position (P1) in which the pressure part (38) is positioned approached to the base (25) and a lifted position (P2) in which the pressure part (38) is positioned to be spaced apart from the base (25).
  9. Lifting gear according to claim 8, characterized in that the pressure part (38) is positioned in the lowered position (P1) underneath lower attachment bearings (42a, 42b) provided at the base (25) for the toggle means (30), and/or the pressure part (38) is positioned in the lifted position (P2) above the lower attachment bearings (42a, 42b) provided at the base (25) for the toggle means (30).
  10. Lifting gear according to one of the preceding claims, characterized in that the toggle means (30) is movable between a retracted position (M1) and an extended position (M2) in which upper attachment bearings (41a, 41b) provided at the lifting platform (26) for the toggle means (30) have a different distance with respect to each other than lower attachment bearings (42a, 42b) provided at the base (25) for the toggle means (30).
  11. Lifting gear according to one of the preceding claims, characterized in that the pressure part (38) is adjustable along the lifting axis (H) in a linearly guided manner.
  12. Lifting gear according to claim 11, characterized in that the pressure part (38) is guided along the lifting axis (H) on the drive side only by a retractable and extendable piston (40) of the drive unit (29), or the lifting gear (24) has at least one separate linear guidance (43) for the pressure part (38).
  13. Lifting gear according to one of the preceding claims, characterized in that the drive unit (29) is embodied as a pneumatic cylinder or as an electric cylinder.
  14. Deep-drawing packaging machine (1) or tray sealing machine (15) with at least one lifting gear (24) according to one of the preceding claims.
EP21204898.7A 2020-12-23 2021-10-27 Hoisting gear Active EP4019415B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102020134816.9A DE102020134816A1 (en) 2020-12-23 2020-12-23 hoist

Publications (2)

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EP4019415A1 EP4019415A1 (en) 2022-06-29
EP4019415B1 true EP4019415B1 (en) 2024-05-29

Family

ID=78621667

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21204898.7A Active EP4019415B1 (en) 2020-12-23 2021-10-27 Hoisting gear

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Country Link
US (1) US20220194761A1 (en)
EP (1) EP4019415B1 (en)
CN (1) CN217706619U (en)
DE (1) DE102020134816A1 (en)

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US364995A (en) * 1887-06-14 John melvin drew
DE7305441U (en) 1973-09-27 Bosch R Gmbh Device for opening and closing processing stations
DE3638730A1 (en) 1986-11-13 1988-05-26 Georg Roeck Device for transferring, intensifying and transmitting a pressure
DE19702889C2 (en) * 1996-01-26 2001-09-06 Engel Gmbh Maschbau Drive device for a locking mechanism and / or an injection unit of an injection molding machine
DE29621761U1 (en) * 1996-12-14 1998-04-09 Dixie-Union GmbH & Co. KG, 87437 Kempten Packaging machine with a chamber consisting of an upper part and a lower part
DE59709858D1 (en) * 1997-08-08 2003-05-22 Multivac Haggenmueller Kg Lifting device for a work station of a packaging machine
DE19960084A1 (en) * 1999-12-13 2001-06-21 Kraemer & Grebe Kg Packing machine has work stations with tools mounted on vertically sliding plates moving in guides, crankshaft being attached at one end to bar fixed to each plate and at other end to drive which moves it clockwise and anti-clockwise
DE10327092A1 (en) 2003-06-13 2004-12-30 Cfs Germany Gmbh Work station and packaging machine
DE102006006218A1 (en) 2006-02-09 2007-08-16 Cfs Germany Gmbh Lifting device for a packaging machine
DE102012003839A1 (en) * 2012-02-29 2013-08-29 Zahoransky Ag Blister packaging system, has control computer monitoring force absorption of lifting unit and calculating tolerance value, where toggle lever movement is influenced during excess of cut-off threshold
EP2666727B1 (en) * 2012-05-24 2016-09-07 MULTIVAC Sepp Haggenmüller SE & Co. KG Lifting device for a packing machine
EP3294636B1 (en) 2015-05-13 2019-02-27 GEA Food Solutions Germany GmbH Packaging machine having a lifting device
DE102019219833A1 (en) * 2019-12-17 2021-06-17 Multivac Sepp Haggenmüller Se & Co. Kg Work station for a packaging machine with a lifting mechanism with a toggle mechanism

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DE102020134816A1 (en) 2022-06-23
CN217706619U (en) 2022-11-01
EP4019415A1 (en) 2022-06-29
US20220194761A1 (en) 2022-06-23

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