Machine for assembling a cardboard pallet insert

Abstract

The present invention relates to a machine (1) for assembling cardboard inserts (4), the machine comprising three areas. The cardboard sheets (3) to be assembled are introduced in a first area (1.1) and are picked up one by one by means of a suction cup mechanism (6) and placed on a conveyor (5) that moves them to a second area (1.2). The second area has a mechanism with a first and second male half-moulds (8, 8') that each have a curved central area and blades, folding members and a vertical, pivotable press that fold a series of reinforcements and flaps of the sheet (3) to perform the initial operations for assembling the insert (4). The final assembly is carried out in the third area (1.3).

Description

[0001] MACHINE FOR ASSEMBLING CARDBOARD PALLET INSERTS DESCRIPTION OBJECT OF THE INVENTION

[0002] The present invention falls within the technical field of manufacturing cardboard loading platforms. Specifically, it describes a machine for assembling cardboard inserts of the type used to manufacture loading platforms (pallets).

[0003] Additionally, a method for assembling a cardboard insert in the previously described machine is described.

[0004] TECHNICAL PROBLEM TO BE SOLVED AND BACKGROUND OF THE INVENTION

[0005] The significant rise in environmental awareness is generating a high and ever-increasing demand for next-generation cardboard pallets. These pallets comprise a variety of components, making them structurally more complex, but in return, they are far more widely used than the cardboard pallets used until now. Along with this growing demand comes the need to provide state-of-the-art cardboard pallet assembly equipment that allows for optimal assembly.

[0006] Until now, these stronger and more complex pallets have generally been assembled manually. This increases their cost and also results in very low volumes of pallets assembled per unit of time, preventing them from competing on equal terms with plastic or wooden loading platforms.

[0007] A currently known solution for assembling cardboard pallets is described in document ES2260987, which proposes a pallet assembly machine designed to form cardboard pallets. This machine includes storage, feeding, and dosing means for stringers, and for crossbeams, located in designated areas. The stringers are positioned longitudinally on their edges, and the corresponding crossbeams are attached transversely. Both the stringers and crossbeams have complementary notches for interlocking. The stringers move on guides and are positioned in an area where the crossbeams drop in and are pushed vertically by a pusher to perform the upper assembly of the crossbeams onto the stringers, which have been previously and properly positioned in the area.

[0008] Also known is document EP053435, which describes a lightweight corrugated cardboard pallet and an apparatus and method for its assembly. The pallet has longitudinally spaced members that intersect laterally spaced members by means of interlocking notches aligned with the transverse members. These members have cutouts that form channels to receive points for the spikes of a lifting installation. The spike lifting points are completely continuous panels that extend horizontally with additional support panels that increase the width of the lifting point. Each member is slotted on one side only and folded symmetrically inward to form a solid core of corrugated cardboard panels.

[0009] Also known is document FR2672001 which proposes an installation with a first assembly intended to make the upper surface of a pallet and its positioning and fixing on some blocks, and a second assembly intended to make the support base on the ground and for its positioning and fixing to the blocks, both assemblies being separated from each other by a pallet inversion device.

[0010] Therefore, facilities for forming cardboard pallets are currently known. These facilities comprise a plurality of modules on which the different elements that subsequently make up the pallet are assembled.

[0011] DESCRIPTION OF THE INVENTION

[0012] The machine that is the subject of the invention is configured to assemble cardboard inserts from a sheet of cardboard. In one possible embodiment, this machine forms part of a module for forming elements of a cardboard pallet.

[0013] The machine comprises three adjacent zones through which the cardboard sheet to be assembled as an insert moves. Each zone contains various components that perform a series of operations to complete the assembly.

[0014] In the first zone, where the cardboard sheets for assembling the inserts are received, there may be one or more infeed channels. This will primarily depend on the number of rows of inserts to be formed. When the inserts are to be placed on a pallet and the machine is designed to be installed in a forming module and / or a cardboard pallet assembly line, the machine will preferably have as many infeed channels as there are rows of inserts on the pallet to be assembled.

[0015] In this first zone, there is also a suction cup mechanism, preferably positioned beneath the cardboard sheets, to draw the sheet to be worked on from its underside. The suction cup mechanism is configured to pick up the sheet to be assembled and move it to a conveyor belt or chain conveyor, which then transports it to the next zone (the second zone of the machine).

[0016] Preferably, the machine comprises at least one adhesive applicator for placing adhesive on the specific areas of the sheet that are to be glued together in the second working area of ​​the machine.

[0017] Once the sheet metal reaches the second zone, it undergoes multiple folds to begin assembling the insert. This second zone of the machine contains an assembly mechanism with vertically movable knives and folding mechanisms, also vertically movable but in the opposite direction to the knives. Additionally, this second zone includes vertical presses and folding mechanisms that can be both vertically movable and rotated to complete the folding operations in conjunction with the knives and folding mechanisms.

[0018] The mechanism also includes semi-taps that can be moved vertically and rotated to allow for the correct assembly of the insert. Specifically, each semi-tap can rotate around an axis such that, when the vertical presses and folding mechanisms rotate, they exert force on the semi-taps, moving them from a rest position to a working position. These semi-taps also feature curved central sections designed to receive some of the sheet's reinforcements and / or flaps, enabling its proper folding and joining. Once the corresponding operations have been performed in the second zone, the sheet is moved by means of a conveyor (chain or belt) to the third zone.Preferably, the machine comprises a few glue applicators configured to place adhesive on the corresponding areas of the sheet and / or some of the already semi-assembled parts of the insert.

[0019] In the third zone, the final assembly operations are carried out. This zone contains a final assembly mechanism with a final assembly mandrel, first final forming elements, second final forming elements, and final folding mechanisms. The final assembly mandrel can move vertically, while the first final forming elements, second final forming elements, and folding mechanisms remain fixed. These fixed elements contribute to the forming of the insert as the final assembly mandrel, in its vertical movement, displaces the cardboard sheet with its corresponding flaps, half-sides, and / or reinforcements.

[0020] BRIEF DESCRIPTION OF THE FIGURES

[0021] To complete the description and to aid in a better understanding of the characteristics of the invention, a set of drawings is included with this descriptive document as an integral part thereof, in which, for illustrative and non-limiting purposes, the following has been represented:

[0022] Figure 1 represents an elevation view of a forming module of a pallet assembly installation where the cardboard insert assembly machine of the invention can be observed.

[0023] Figure 2 represents a plan view of the module in Figure 1 with the cardboard insert assembly machine of the invention.

[0024] Figures 3A-C represent a sequence of folding the sheet to form the insert.

[0025] Figures 4A-E represent a sequence of movements of the elements of the second zone of the insert assembly machine. Figures 5A-C represent the final assembly mechanism in a perspective view, in a side view, and part of said final assembly mechanism in an exploded view respectively.

[0026] Figures 6A-F represent a sequence of movements of the elements of the final assembly mechanism.

[0027] The following is a list of the numerical references used:

[0028] 1: Machine

[0029] 1.1: First zone

[0030] 1.2: Second zone

[0031] 1.3: Third zone

[0032] 2: Module

[0033] 3: Sheet

[0034] 3.1: First extreme reinforcement

[0035] 3.2: First flap

[0036] 3.3: First half-side

[0037] 3.4: First central reinforcement

[0038] 3.5: Second extreme reinforcement

[0039] 3.6: Projection

[0040] 4: Insert

[0041] 4.1: First sides

[0042] 4.2: Second sides

[0043] 4.3: Base

[0044] 5: Conveyor

[0045] 6: Suction cup mechanism

[0046] 7: First applicator

[0047] 7': Second applicator

[0048] 8: First semi-male

[0049] 8': Second half-male

[0050] 9: Curved central zone

[0051] 10: Knife

[0052] 11: Folder

[0053] 12: Vertical press and abattoir

[0054] 13: Final assembly male 14a: First short final folding element

[0055] 14b: First long final folding element

[0056] 15: Second element of final folding

[0057] 16: Final folding tool

[0058] 17: Input Channel

[0059] 18: Lane

[0060] 19: Upper servomotor

[0061] 19': Lower servomotor

[0062] 20: Upper bridge

[0063] 20': Lower bridge

[0064] 21: Positioner

[0065] 22.1 : Sliding pressure wheel

[0066] 22.2: Fixed pressure wheel

[0067] 23: Upper tamper

[0068] 24: Pneumatic pusher cylinder

[0069] 25: Guide bar

[0070] LP1: First folding lines

[0071] LP2: Second folding lines

[0072] LP3: Third folding lines

[0073] LP4: Fourth folding line

[0074] LP5: Fifth folding line

[0075] DETAILED DESCRIPTION

[0076] The present invention is not limited to the embodiment described herein. Other configurations may be achieved by those skilled in the art, based on this description.

[0077] Preferably, the cardboard insert assembly machine (1) comprises three aligned zones through which a cardboard sheet (3) is moved until it is formed into an insert (4) for use on a pallet. The machine (1) comprises at least one infeed channel (17).

[0078] Preferably, when the machine (1) is to be installed in a forming module (2) in a pallet forming plant, the machine (1) comprises an inlet channel (17) corresponding to each row of inserts (4) to be placed in the pallet to be manufactured. Figure 1 shows a forming module (2), and the machine (1) and a first zone (1.1), a second zone (1.2), and a third zone (1.3) of the machine are indicated.

[0079] Figure 2 shows a top view of part of the forming module (2) and the areas (1.1, 1.2, 1.3) of the machine (1) have also been indicated.

[0080] A first zone (1.1) of the machine is intended to receive the cardboard sheets (3) from which the inserts (4) are formed. In this first zone (1.1) there is a suction cup mechanism (6) arranged in the lower section of the machine, such that it is configured to exert a suction force on the cardboard sheets (3), on a lower face of said cardboard sheet (3).

[0081] Furthermore, the first zone (1.1) comprises a conveyor (5) which can be a chain or belt conveyor. This conveyor (5) is configured to receive the cardboard sheets (3), transported individually by the suction cup mechanism (6), and move them to a second zone (1.2).

[0082] Figures 3A-C show the assembly sequence of the insert (4) from the sheet (3).

[0083] The insert (4), once assembled, comprises a base (4.3) and four sides, parallel in pairs, these being the first two sides (4.1) and the second two sides (4.2). Each insert is manufactured from a sheet of cardboard (3) comprising a plurality of foldable flaps that form the corresponding sides (4.1, 4.2).

[0084] The first sides (4.1) are formed by folding first end reinforcements (3.1) over first flaps (3.2), rotating around first fold lines (LP1), the first end reinforcements (3.1) being joined to the corresponding first flap (3.2) by adhesive forming a first half-side (3.3) and, subsequently, said first half-side (3.3) is rotated around second fold lines (LP2) and is joined to a first central reinforcement (3.4). From this first central reinforcement (3.4) extend some second end reinforcements (3.5) that rotate around some third fold lines (LP3), until they are in a position perpendicular to the first sides (4.1) and are joined, by means of adhesive, to some projections (3.6) (which extend from the base (4.3) of the insert and which rotate around some fourth fold lines (LP4) until they are arranged perpendicular to said base (4.3)) to form the second sides (4.2).

[0085] The cardboard sheets (3) that are to be used to assemble the inserts are always arranged on the suction cup mechanism (6).

[0086] Between the first zone (1.1) and the second zone (1.2) (located in any of the zones) are first applicators (7) configured to apply glue to the cardboard sheet (3), at the specific points where the reinforcements and corresponding flaps will come into contact at each step of the insert assembly (5).

[0087] The second zone (1.2) comprises a forming base, designed to receive the corresponding cardboard sheet (3) from the conveyor (5) of the first zone (1.1). The second zone (1.2) also comprises a first mechanism for folding and unfolding the first end reinforcements (3.1) and the first flaps (3.2) that form the first halves (3.3). This mechanism comprises, as can be seen in Figures 4A-E, the following elements:

[0088] - knives (10) configured to press on the first fold lines of the cardboard sheet (3) which determine fold lines around which the first end reinforcements (3.1) rotate until they are positioned on the corresponding first flap (3.2);

[0089] - two semi-males (8, 8') where said semi-males (8, 8') have a curved central zone (9);

[0090] - some folding machines (11); and

[0091] - a vertical and foldable press (12) that moves vertically from the lower section of the forming base (2).

[0092] In the aforementioned figures 4A-E, a sequence of the movements performed by the elements of the forming mechanism of the first halves (3.3) located in the second zone (1.2) of the machine (1) has been represented.

[0093] The two half-taps (8, 8') are moved by an upper servomotor (19) which is configured to move an upper bridge (20) guided by lead screws (preferably two lead screws and preferably ball screws) which may be arranged, for example, at the end of the upper bridge (20). The half-taps (8, 8') are installed on the upper bridge (20). These half-males (8, 8') have displacement between a rest position and a working position in which the central curved zone (9) of the half-males (8, 8') receives the first end reinforcements (3.1) which, at the same time, are raised by means of the folding mechanisms (11), which are attached to a lower bridge (20') which is moved by a lower servomotor (19'), and pushed towards said central curved zone (9) by the vertical and folding press (12) which is also attached to the lower bridge (19') and which rises from the bottom of the forming base.These elements can be clearly seen in figures 4A-E.

[0094] Thus, the curved central section (9) of the half-tabs (8, 8') is configured to guide the folding of the first end reinforcements (3.1) towards the first flaps (3.2) along the first fold line (LP1) and to guide the folding of the assembly of the first flaps (3.2) with the first end reinforcements (3.1) over the first central reinforcements (3.4) around a second fold line (LP2) to form the first half-sides (3.3). Once the folding movement of the first end reinforcements (3.1) has been guided towards the curved central section (9) of the half-tabs (8, 8'), they are held in that position until the vertical and hinged press (12) folds and glues the first flap (3.2).Simultaneously with the movement of the vertical and folding press (12), the vertical movement of the half-tap (8, 8') begins and it is the rotation of the vertical and folding press (12) that causes the rotation of the half-tap (8, 8') to go from the rest position to the working position.

[0095] As described, these elements and their corresponding movements are used to fold and unfold the first end reinforcements (3.1) and the first flaps (3.2) that form the first half-sides (3.3). These first half-sides (3.3) are then joined to the first central reinforcements (3.4). Figure 3B shows these first half-sides (3.3) already formed.

[0096] Once the first half sides (3.3) have been formed and joined to the first central reinforcements (3.4), the conveyor (5) (which extends from the first zone (1.1) through the second zone (1.2) and to the third zone (1.3)), moves the cardboard sheet (3) to the third zone (1.3).

[0097] In this third zone (1.3) is a final assembly mechanism, as shown in Figures 5A and 5B. Figure 5C shows part of this final assembly mechanism in an exploded view, where the positioner (21) is more clearly visible. The movable pressure wheels (22.1) and the fixed pressure wheels (22.2) are also clearly visible.

[0098] Figures 6AF also show an operating sequence of the final assembly mechanism. When the cardboard sheet (3) reaches the third zone (1.3), the sheet is folded by the final assembly mechanism, which is of a type known in the prior art. Preferably, this final assembly mechanism comprises a final assembly mandrel (13), which has lower plates for pressing an upper surface of the first sides (4.1) and the second sides (4.2) of the insert (4), with vertical displacement that pushes the cardboard sheet (3) into a forming station comprising a plurality of folding elements (first final folding elements (14a, 14b) and second final folding elements (15)) in a plane lower than the plane in which the cardboard sheet (3) is disposed. These elements are responsible for rotating the assembly of the first half-sides (3.3) joined to the first central reinforcements (3).4) to form the first sides (4.1) and rotate the second end reinforcements (3.5) which rotate around the third folding lines until they are in a position perpendicular to said first sides (4.1). The final assembly mechanism also comprises final folding elements (16).

[0099] Likewise, the final assembly mechanism comprises first final folding elements (14a, 14b) and second final folding elements (15) on a plane lower than the plane in which the cardboard sheet (3) is arranged, which are responsible for folding the projections (3.6) until they are joined with the corresponding second end reinforcements (3.5) to form the second sides (4.2).

[0100] Figure 6A shows all the elements of the final assembly mechanism in the starting position of the assembly sequence. The sheet (3) is shown already partially folded, as it arrives at the third zone (1.3) of the machine (1).

[0101] In Figure 6B, the final assembly male (13) descends, pushing the sheet (3) into what will be the base (4.3) of the insert (4) once assembled. The second end reinforcements (3.5) begin to make contact with the first final folding elements (14a, 14b) and with the second final folding element (15). The first final folding elements (14a, 14b) preferably have different heights to advance the second reinforcements (3.5) on either side; therefore, one of them is a short first final folding element (14a) and the other is a long second final folding element (14b). Figure 6C represents the next step in the sequence, in which the first final folding elements (14a, 14b) and the second final folding elements (15) continue to act.

[0102] Figure 6D shows a positioner (21) in contact with the second end reinforcement (3.5) to which the projection (3.6) will later be attached. A pressure wheel (22) is also shown applying pressure to a first half (3.3) that forms a first side (4.1) of the insert (4), maintaining the shape of the insert (4) as it is formed. The figure also shows an upper tamper (23) that has been actuated (moving downwards) until it contacts an upper edge of the insert (4), specifically the upper edge of the second side (4.2) of the insert (4) as it is formed.

[0103] Figure 6E shows how the final folding mechanisms (16) fold the projection (3.6) and complete the forming of the second sides (4.2) of the insert (4). Figure 6F shows the fully formed insert (4) in the final forming mechanism of the third zone (1.3) of the machine (1).

[0104] Thus, the machine (1) comprises, in the final assembly mechanism of the third zone (1.3), positioners (21) configured to retain the second reinforcements (3.5) in their position once they have been folded, by the third folding lines (LP3), and wherein said positioners (21) are arranged opposite each other and have a wedge-shaped element guided by the first short final folding element (14a) and are actuated by pneumatic cylinders.

[0105] The second set of end-folding elements (15) initiates the folding of the first half-side (3.3). In addition, the movable pressure wheels (22.1) are moved horizontally to position this first half-side (3.3) perpendicular to the base (4.3). The movable pressure wheels (22.1) are pushed by a pneumatic pusher cylinder (24) guided by two guide bars (25). These elements can be seen, for example, in Figure 5C.

[0106] That is, the machine comprises pneumatic cylinders (24) configured to push movable pressure wheels (22.1) that act on halves (3.3) of the sheet (3), placing said halves (3.3) in a vertical position and pressing them against the final assembly mandrel (13).

[0107] The movable pressure wheels (22.1) and the positioner (21) begin to act practically at the same time.

[0108] The final assembly mandrel (13) preferably comprises upper rams (23) which are flat plates, with vertical movement in the same direction of movement as the final assembly mandrel (13), configured to press an upper edge of some second sides (4.2) of the insert (4) being formed.

[0109] Also located between the second zone (1.2) and the third zone (1.3) are second applicators (7') configured to apply glue to the cardboard sheet (3), at the specific points where the reinforcements and corresponding flaps will come into contact at each step of the insert assembly (5).

[0110] The machine may also include rails (18), partially housed in the third zone (1.3), through which the assembled insert (4) is transported out of the machine (1). If the machine (1) is part of a forming module (M), these rails (18) pass through the rest of the forming module (M) and allow the inserts (4) to be sent, for example, to other modules of a pallet forming plant.

Claims

CLAIMS 1 Machine for assembling a cardboard insert (4) from a cardboard sheet (3) comprising a first zone (1.1), a second zone (1.2) and a third zone (1.3), arranged in line and connected to each other by at least one conveyor (5) configured to move the sheet (3) from an input channel (17) of the first zone (1.1), and the machine (1) comprises: - in the first zone (1.1): a suction cup mechanism (6) configured to generate a vacuum such that it exerts a suction force on a lower face of the sheet (3) and displaces it to the conveyor (5); - in the second zone (1.2): a mechanism with a forming base, with knives (10) that move vertically and are configured to fold the sheet (3) along first folding lines (LP1), a first half-taper (8) and a second half-taper (8') each with a curved central zone (9) and configured to move vertically and receive, in the curved central zone (9), part of the cardboard sheet (3) displaced by folders (11) and a vertical and tilting press (12), which are part of the mechanism, and where the folders (11) are arranged in two groups of two, where the folders (11) of each group are facing each other and move vertically from below the forming base upwards, to perform a fold of the sheet (3) along said first folding line (LP1), and the vertical and tilting press (12) is configured to perform a tilting movement through which,When the folders (11) have been moved vertically upwards, the cardboard sheet is folded along a second folding line (LP2) and the tilting movement of the vertical and tilting press (12) is a vertical upward displacement movement and a rotational movement in the direction of the curved central area (9) of the first half-die (8) or the second half-die (8') as appropriate; and, - in the third zone (1.3): a final assembly mechanism with a final assembly male (13) and first and second final folding elements (14, 15) and a final folding bender (16) complementary to the final assembly male (13).

2. A cardboard insert assembly machine according to claim 1, characterized in that it comprises at least one first applicator (7) arranged in the first zone (1.1) or in the second zone (1.2) and configured to apply glue to the sheet (3) when it moves from the first zone (1.1) to the second zone (1.2).

3. A cardboard insert assembly machine according to any one of claims 1 or 2, characterized in that it comprises at least one second applicator (7') arranged in the second zone (1.2) or in the third zone (1.3) and configured to apply glue to the sheet (3) when it moves from the second zone (1.2) to the third zone (1.3).

4. Cardboard insert assembly machine according to any one of the claims, wherein the first half-core (8) and the second half-core (8') are arranged with the curved central zones (9) oriented in opposite directions, and said first and second half-cores (8, 8') have a displacement movement in a vertical direction towards the forming base in which the sheet (3) is located, and a rotational movement between a rest position and a working position, wherein said rotation is performed around rotation axes that are parallel to each other, so that, when rotating towards the working position, some lower ends of the half-cores (8, 8') separate from each other.

5. Cardboard insert assembly machine according to any one of the preceding claims comprising, in the final assembly mechanism of the third zone (1.3), two positioners (21) configured to retain second reinforcements (3.5) of the sheet (3) in their position once they have been folded by third folding lines (LP3), and wherein said positioners (21) are arranged opposite each other and comprise a wedge-shaped element, and are guided by first short final folding elements (14a) that form part of the final mechanism of the third zone (1.3), and are driven by pneumatic cylinders.

6. Cardboard insert assembly machine according to any one of the preceding claims comprising pneumatic cylinders (24) configured to push movable pressure wheels (22.1) acting on halves (3.3) of the sheet (3) placing said halves (3.3) in a vertical position and pressing them against the final assembly mandrel (13). 7.- Cardboard insert assembly machine according to any one of the preceding claims, wherein the final assembly mandrel (13) comprises upper stampers (23) which are flat plates, with vertical movement in the same direction of movement as the final assembly mandrel (13), configured to press an upper edge of some second sides (4.2) of the insert (4) being formed. 8.- Installation for forming cardboard pallets characterized in that it comprises a machine as described in any one of the preceding claims.

9. Method of assembling cardboard inserts (4) from a cardboard sheet (3) in an insert assembly machine (1) as described in any one of claims 1 to 7, comprising the following steps to be performed in the second zone (1.2) of the machine (1): - fold some first end reinforcements (3.1) by vertical displacement of the knives (10) downwards until they come into contact with the sheet (3) and by vertical displacement of the folding mechanisms (11) upwards until they exceed the height at which the forming base is arranged, causing the folding of the first end reinforcements (3.1 ) around a first folding line (LP1 ); - joining the first end reinforcements (3.1) to a first flap (3.2) of the sheet (3), forming a half-side (3.3), by moving the half-taps (8, 8') to the working position and combining vertical upward displacement and rotation of the vertical press and hinge (12) towards the curved central area (9) of the respective half-tap (8, 8') such that, during the rotation movement of the vertical press and hinge (12), it moves the first end reinforcements (3.1) and the first flap (3.2) with it, folding said second flap (3.2) against the corresponding half-tap (8, 8'); - join the half-side (3.3) to a first central reinforcement (3.4) by moving the half-taps (8, 8') to the rest position such that the rotation of the vertical press continues and lower it (12) until the half-side (3.3) is placed on the first central reinforcement (3.4) of the sheet (3).

10. The method according to claim 9 further comprises, in the third zone (1.3) of the machine (1), a step of vertically displacing the final assembly mandrel (13) towards the sheet (3), defining a lower surface of the final assembly mandrel (13), the base (4.3) of the insert (4) such that, during the downward vertical displacement, the first halves (3.3) and the second end reinforcements (3.5) come into contact with first final folding elements (14a, 14b) and second final folding elements (15) and final folding benders (16), such that the first halves (3.3) tilt with respect to the base (4.3) of the insert (4), and the second end reinforcements (3.5) are folded along a third folding line (LP3) with respect to the first halves (3.3). 11.- Method according to any one of claims 9 to 10 wherein, when the halves (3.3) are folded by the second folding line (LP2) and the first central reinforcements (3.5) by the third folding line (LP3), a positioner (21) of the final folding mechanism ensures its position and, when the final folding mandrel (21) moves downwards, and the projections (3.6) come into contact with final folding benders (16) such that they are folded by a fourth folding line (LP4) tilting with respect to the base (4.3) of the insert (4). 12.- Method according to any one of claims 9 to 11 wherein the rotational movement of the vertical presses and abattoirs (12) causes the transition from the rest position to the working position of the half-taps (8, 8') by pressing the curved central area (9) of said half-taps (8, 8') during the folding of the first end reinforcements (3.1) together with the first flaps (3.2) towards the first central reinforcements (3.4) to form the first half-sides (3.3).

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