EP2018264B1 - Machine for forming packing boxes - Google Patents
Machine for forming packing boxes Download PDFInfo
- Publication number
- EP2018264B1 EP2018264B1 EP07734485.1A EP07734485A EP2018264B1 EP 2018264 B1 EP2018264 B1 EP 2018264B1 EP 07734485 A EP07734485 A EP 07734485A EP 2018264 B1 EP2018264 B1 EP 2018264B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- box
- turret
- machine according
- sealing
- relative
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Not-in-force
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
- B31B50/26—Folding sheets, blanks or webs
- B31B50/44—Folding sheets, blanks or webs by plungers moving through folding dies
- B31B50/46—Folding sheets, blanks or webs by plungers moving through folding dies and interconnecting side walls
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D5/00—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper
- B65D5/20—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper by folding-up portions connected to a central panel from all sides to form a container body, e.g. of tray-like form
- B65D5/2014—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper by folding-up portions connected to a central panel from all sides to form a container body, e.g. of tray-like form the central panel having a non rectangular shape
- B65D5/2033—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper by folding-up portions connected to a central panel from all sides to form a container body, e.g. of tray-like form the central panel having a non rectangular shape polygonal having more than four sides, e.g. hexagonal, octogonal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
- B31B50/60—Uniting opposed surfaces or edges; Taping
- B31B50/72—Uniting opposed surfaces or edges; Taping by applying and securing strips or sheets
- B31B50/722—Uniting opposed surfaces or edges; Taping by applying and securing strips or sheets on already formed boxes
- B31B50/724—Applying tapes on the corners of set-up boxes, e.g. involving setting-up
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
- B31B50/26—Folding sheets, blanks or webs
- B31B50/44—Folding sheets, blanks or webs by plungers moving through folding dies
- B31B50/442—Folding sheets, blanks or webs by plungers moving through folding dies having several cooperating plungers and dies fitted on a rotating table or on moving chains
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
- B31B50/60—Uniting opposed surfaces or edges; Taping
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
- B31B50/60—Uniting opposed surfaces or edges; Taping
- B31B50/64—Uniting opposed surfaces or edges; Taping by applying heat or pressure, e.g. by welding
Definitions
- the present invention relates to a machine for forming boxes, of the type now known as a "quadrangular" machine, in particular for producing packing boxes from paper or cardboard blanks.
- Prior art box production devices substantially consist of machines which fold a blank to form the lateral walls of a box and of sealing heads which seal together the corners formed between the initially open lateral walls of the box.
- the box corners are usually sealed by sealing heads with "V"-shaped pressers extending parallel with the lateral walls of the box. Said pressers are fed along the bisecting lines of the base of the box until they make contact with the end portions of the lateral walls, so that they are placed over the corner of the box.
- the sealing heads then apply heat-sealing strips or tapes to the corners in contact and, by means of the pressers, join said strips to the corners, making the lateral walls of the box integral with one another.
- GB 325741 describes a quadrangular machine in which the opposite sealing heads can be rotated about a shared axis, so that it is easy to change the size, that is to say, vary the dimensions of the box, and/or pass from a square shape to a rectangular shape and vice versa.
- EP 1609585 describes a machine with sealing heads able to oscillate relative to an axis in order to vary the approach direction.
- the sealing heads are mounted in pairs on opposite parallel sliding cross-members, angled according to a first direction and able to move relative to one another in a perpendicular direction.
- US 2641973 describes a machine with sealing heads arranged in pairs, in such a way that each pair of heads can be slided in perpendicular directions.
- the sealing heads are adjusted by moving the cross-members and therefore the sealing heads along the cross-members to position the pressers at the corners of the boxes, then making the heads oscillate until the desired approach angle is found.
- the technical purpose of the present invention is to propose a quadrangular machine which is free of the above-mentioned disadvantages.
- the present invention has for an aim to provide a machine for producing boxes which allows the production of boxes with any plan extension and preferably boxes with more than four sides.
- the machine 1 comprises a base frame 2 and at least one turret 3, but usually a plurality of turrets, associated with the frame 2.
- Each turret 3 comprises a sealing head 4, or presser, designed to stably join the corners of a box being formed by applying a heat-sealed or glued material tape to the corner.
- Each sealing head 4 preferably has an angular profile with an amplitude that differs according to the angle of the corner formed by the lateral walls of the box.
- the head 4 opening will be 90°, whilst for boxes with a regular hexagonal plan the opening will be 120°.
- the sealing heads 4 may be removably associated with the turret 3, so that, depending on the angle formed by the corner of the box to be formed, the most suitable sealing heads 4 can be mounted on the turrets 3.
- the machine 1 also comprises means 5 for feeding a blank (schematically illustrated in Figure 2 ) acting on the base frame 2 to feed a blank to a start of forming table 30 in a position between the sealing heads 4.
- a blank (schematically illustrated in Figure 2 ) acting on the base frame 2 to feed a blank to a start of forming table 30 in a position between the sealing heads 4.
- blank in the context of this invention, refers to a sheet of paper or plastic material 31 comprising a plurality of pre-creasing lines 32 along which the blank is folded to create the box being formed.
- the means 5 preferably comprise a stepping elevator 50 with a pick up mechanism (of the known type) which picks up blanks 31 one after another from the elevator 50 and feeds them to a conveyor belt 51 which in turn places the blanks on the table 30.
- a pick up mechanism of the known type
- the machine also comprises a counter-mould 10 having the same shape and size as the base wall 34 of the box to be produced and vertically movable driven by an actuator 33.
- the counter-mould 10 performs a downstroke until it is positioned over a base section 34 of the blank on the table 30, and drags down the blank until it is positioned on a box forming table 6 below the table 30 and around which the various turrets 3 are located.
- the blanks are folded by the combined action of the counter-mould 10 and folder elements 7, schematically illustrated in Figure 4 , positioned at and outside the sides of the base section of the box so as to intercept the downstroke of the sides 35 and fold them against the mould 10.
- the box closing or sealing step begins, carried out in the known way as the turret 3 sealing heads 4 place strips 52 of heat-sealed or glued material along the open corners 49.
- the machine 1 also comprises a turret holder unit 13 associated with each turret 3 and comprising a "cross carriage” type mechanism consisting of two slides 38, 39 which can slide relative to one another.
- Each turret holder unit 13 can therefore slide in an adjustable way along two directions B, C perpendicular to one another (respectively horizontal/vertical with reference to Figure 5a ) relative to the base frame 2 and the position of the mould 10, so that they adapt to the dimensions of the box to be formed and to the positions occupied by the vertices of the corners 49 of the box to be sealed.
- each turret holder unit 13 is mounted on a cross-member 53 moved by screws 75 and in a direction C along guides 54 fixed on the frame 2.
- each unit 13 slides in the direction C together with the respective cross-member 53 (first controlled movement), and can also be moved independently in directions B, C (second controlled movement) relative to the position of the cross-member 53, thanks to the slides 38, 39.
- first guide means 14 for example worm screws angled in the direction B and acting on the slide 38 and associated with the cross-member 53 so that the first slide 38 can slide in an adjustable way on linear prismatic guides located on the cross-member 53.
- said means consist of a movable adjusting screw 14' integral with the screw 14 and engaging in a bushing 77 integral with the slide 38 (movement B).
- the movement in direction C is adjusted by second guide means 15, for example a worm screw angled in the direction C, associated with the slide 38 and engaging with the slide 39 in such a way that the second slide 39 can slide in an adjustable way on linear prismatic guides 40 located on the slide 38, for movement of the slides 38 and 39 relative to one another in direction C.
- second guide means for example a worm screw angled in the direction C, associated with the slide 38 and engaging with the slide 39 in such a way that the second slide 39 can slide in an adjustable way on linear prismatic guides 40 located on the slide 38, for movement of the slides 38 and 39 relative to one another in direction C.
- the rotation of the screws 14, 15, 75 and the movement of the cross-members 53 can be adjusted and controlled automatically or manually with each size change-over for the boxes being produced, depending on the selected machine operating mode.
- each unit 13 is therefore capable of two movements in direction B, one approach movement controlled by the screw 14 and one adjusting movement controlled by the screw 14', and two movements in direction C, one approach movement controlled by movement of the cross-members 53 and one additional adjusting movement controlled by the screw 15.
- a turret 3 is rotatably connected on the unit 13 relative to the position of the counter-mould 10 and therefore of the box 36, so that it can define a plurality of directions A1 - An for the sealing head 4 to approach the box being formed, as is schematically illustrated in Figure 3 .
- the turrets 3 have pins 41 which engage with circular slots 42 made in the upper surface of the slide 39 and positioned in a circle preferably with a centre R coinciding with the vertex of the sealing head 4 profile.
- each rotary turret may be adjusted and angled according to one of the approach directions A, guaranteeing that the machine 1 can produce boxes with corners having different amplitudes and orientation, depending on the shape of the box base wall.
- the sealing head 4 may also be able to slide relative to the turret 3 along each approach direction A to perform the operating stroke.
- each turret 3 comprises an actuator cylinder 12 on which the sealing head 4 is removably connected.
- Said actuator 12 therefore allows the sealing head 4 to slide along the approach direction relative to which the turret 3 is angled, to guarantee that the sealing head 4 makes contact with the corner to be sealed, applying the necessary pressure on the heat-sealing tape.
- Each turret 3 also comprises means 18 for feeding sealing tapes to each sealing head 4.
- the feed means 18 are of the known type consisting for example of wheels 60 positioned on each turret 3 and continuously feeding a measured length of sealing tape 43 between the sealing head 4 and the corner of the box to be sealed in combination with a pressure wheel 61.
- each sealing head may have independent feed means, allowing them to feed different lengths of sealing tape for corners of different heights on the same box.
- said tape is applied by heat-sealing the tape on the corner of the box by heating the sealing head 4.
- a tape comprising a surface on which there is a layer of adhesive material which is activated by the heat produced by the sealing head 4.
- the machine 1 also comprises means 20 for extracting the formed box, that is to say the box with the sealed corners, acting on the box to move it away from the forming table 6.
- the extracting means 20 comprise an extractor element which intercepts the box to move it away from the forming table 6.
- the element 20 advantageously comprises a suction cup 21 at one end of a rod 22 guided by vertical guides 47 and moved vertically by a drive unit 46.
- the box being formed has its base 36 on the operating table 6, and the open corners 49 positioned at a distance from the centre O of the base 36 equal to a generic value b, c, respectively in directions B and C.
- FIGS 5a and 5b show this step from above.
- this movement occurs with an approach motion consisting of a first movement of the cross-members 53 in direction C, then independent adjustment in directions C, B of each turret 3 by the adjusting means 14, 40 acting on the slides 38, 39.
- Figure 5b shows the advantage gained from independent adjustment of all of the units 13, allowing sealing of boxes with any irregular plan (for example without axes of symmetry), in which the amplitude of the coordinates (b, c) of the corners 49 to be sealed may be significantly different from one another, both for quadrangular and generically polygonal boxes.
- the head 4 actuators 12 can perform the operating stroke in direction A and seal the open corners with the heat-sealing tapes.
- the angular orientation of the heads 4 is given not by an adjustment, but by the preset position of one or more heads, angled without the possibility of oscillating so as to make the direction A of the operating stroke coincide with the best bisecting line of the corner 49 for sealing a predetermined corner of the box.
- a set of one or more heads 4 may be installed, set up to have operating directions with different angles and corresponding to the geometry of the box to be formed.
- the suction cup 21 makes contact with the base wall of the box 36 and stably connects with it to allow the formed box to be moved from the forming table 6 to an extraction table 45, so that another blank 31 can be fed and a new box formed.
- Each blank 31 consists of a single body comprising a polygonal base 34 and a number of individual walls 35/35' overall equal to the number of sides of the base 34.
- each wall 35 of the blank 31 is joined to the base 34 by a fold line 32 in such a way that once the blank has been folded in the quadrangular machine, the sealing heads can seal the four open corners 49 to obtain a box closed at all its corners, on the base and lateral.
- the blanks of the invention illustrated by way of example in Figures 7a - 7c , have at least one side 55 of the base 34 free, and at least one wall 35' joined both to the base 34 by a first fold line 32 and to at least a second wall 35 by a second fold line 56 converging with and at a right angle to the line 32, so as to constitute at least one multiple part 57.
- the blank 31 has a pentagonal base 34 joined by two fold lines 32 to two multiple walls 57 consisting respectively of two and three adjacent walls 35/35'.
- the blank has a hexagonal base 34, joined by two fold lines 32 to two symmetrically opposite multiple walls 57, both consisting of three adjacent walls 35/35'.
- the blank has an octagonal base 34, joined by two fold lines 32 to two multiple walls 57 joined to two opposite sides of the base 34 and each consisting of three adjacent walls 35/35'.
- the blank is completed by two single walls 35 joined to the opposite sides of the base 34 at right angles to the sides joined to the multiple walls.
- the number of multiple walls 57 is determined in such a way that folding the blank 31 on the counter-mould 10 results in the formation of a box with a number of open corners 49 less than or equal to four and therefore suitable for sealing in a quadrangular machine.
- the independence of the sealing head movements makes it easy for the sealing heads to approach the open corners 49, whatever the polygonal geometry of the box.
- Figure 8 is a schematic illustration of the folding step immediately before sealing of the corners of an octagonal blank with a machine in accordance with the invention.
- the folding means comprise a contact profile 7 at a first wall 35' for folding the wall 35' on a side 70 of the counter-mould 10 during its downstroke, and additional contact profiles 72 acting at the walls 35 which are open at an angle.
- the contact 7 preferably consists of a bar positioned above folding profiles 72 in turn consisting of curved tubular elements with a stretch 73 acting in the vertical direction on the wall 35 and a second stretch 74 acting in a direction at a right angle to the angled side 71 of the mould 10.
- Figure 8 illustrates the case of an octagonal box, but it shall be understood that the same solution may be applied to boxes with more than four sides, in which the sides of the base form included angles a with different amplitude.
- Figures 10 - 12 illustrate a polygonal blank in accordance with the invention, in detail an octagonal blank 81, and a polygonal box 88 obtained from the blank.
- the blank 81 comprises a base 80 and peripheral sections 82 positioned at corresponding sides 83 of the base 80 intended to constitute the walls of the box 88 when lifted.
- each lateral section 82 is joined to sides 83 which are adjacent to the same included side 86, and each lateral section 82 consists of a central portion 84 joined to the side 83 and lateral portions 85 which can be opened by turning relative to the central section 84 and are smaller than the included side 86, preferably half the size of it.
- Figure 11 provides a schematic illustration of the blank folding step, in which the folders 7 lift the sections 82, folding them relative to the sides 83, to form the box 88.
- the lateral portions 85 are folded relative to the portion 84 so as to drawn near one another along intermediate lines M of the wall of the box 88, that is to say, not coinciding with the corner of the box, and preferably coinciding with the median line of the wall.
- a seal S is applied, for example a heat-sealed strip of the type already described, using sealing heads 4 with a 180° flat pressure profile, that is to say, suitable for appropriately pressing the sealing strip S on the walls of the box rather than at the corners.
- the blank is a regular octagon, therefore the heads 4 can have a shared approach direction L passing through a centre C of the base so as to apply a balanced stress on the structure of the machine which supports it during the sealing step.
- the lines L may also not pass through the geometric centre C of the box.
- a method according to the invention for producing packing boxes with a polygonal plan having a base and lateral sections which can be folded relative to the base comprises:
- the method preferably involves making at least two seals positioned at the ends of one or more shared lines (L), at right angles to one another if necessary.
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Description
- The present invention relates to a machine for forming boxes, of the type now known as a "quadrangular" machine, in particular for producing packing boxes from paper or cardboard blanks.
- Prior art box production devices substantially consist of machines which fold a blank to form the lateral walls of a box and of sealing heads which seal together the corners formed between the initially open lateral walls of the box.
- The box corners are usually sealed by sealing heads with "V"-shaped pressers extending parallel with the lateral walls of the box. Said pressers are fed along the bisecting lines of the base of the box until they make contact with the end portions of the lateral walls, so that they are placed over the corner of the box.
- The sealing heads then apply heat-sealing strips or tapes to the corners in contact and, by means of the pressers, join said strips to the corners, making the lateral walls of the box integral with one another.
- The prior art devices briefly described above can automatically produce quadrangular boxes for which the bisecting line of the basic corners, and therefore the approach direction, is always at 45°.
- However, if the lateral walls of the box form different angles, these machines cannot apply the sealing tape correctly without radically changing sealing head assembly on the worktable so that the sealing head operating direction coincides with the bisecting line of the corner of the box to be formed.
-
GB 325741 -
EP 1609585 describes a machine with sealing heads able to oscillate relative to an axis in order to vary the approach direction. In this solution, the sealing heads are mounted in pairs on opposite parallel sliding cross-members, angled according to a first direction and able to move relative to one another in a perpendicular direction. -
US 2641973 describes a machine with sealing heads arranged in pairs, in such a way that each pair of heads can be slided in perpendicular directions. - The sealing heads are adjusted by moving the cross-members and therefore the sealing heads along the cross-members to position the pressers at the corners of the boxes, then making the heads oscillate until the desired approach angle is found.
- However, this solution is relatively complex due to the adjustments involved, and at the same time rigid, since the pairs of sealing heads are constrained to move in a dependent way along the shared cross-members.
- Consequently, with this solution it is, for example, impossible to form the box if the box plan extension does not have at least one pair of parallel sides, that is to say, if the pressers must be positioned independently of one another along the cross-members.
- In this context, the technical purpose of the present invention is to propose a quadrangular machine which is free of the above-mentioned disadvantages.
- In particular, the present invention has for an aim to provide a machine for producing boxes which allows the production of boxes with any plan extension and preferably boxes with more than four sides.
- The technical purpose indicated and the aims specified are substantially achieved by a machine for producing boxes comprising the technical features described in one or more of the claims 1 - 14 herein.
- Further features and advantages of the present invention are more apparent in the detailed description below, with reference to a preferred, non-limiting, embodiment of the invention, illustrated in the accompanying drawings, in which:
-
Figure 1 is a plan view of a machine for producing boxes in accordance with the present invention, with some parts cut away to better illustrate others; -
Figure 2 is a side view of the machine ofFigure 1 ; -
Figures 3a and3b are plan views of two different embodiments of a detail of a machine in accordance with the invention; -
Figure 4 is a side view of the machine ofFigure 3a ; -
Figures 5a and 5b are schematic plan views of machines for forming boxes respectively having an octagonal and irregular quadrilateral shape; -
Figure 6 is a detail of formed box extracting means; -
Figures 7a - 7c illustrate blanks for automatically forming boxes with a plan that respectively has a pentagonal, hexagonal and octagonal shape; -
Figure 8 is a schematic illustration of the step of folding an octagonal blank with a machine in accordance with the invention; -
Figure 9 illustrates an octagonal box produced with the machine in accordance with the invention; -
Figure 10 illustrates a blank in accordance with the invention for automatically forming boxes with an octagonal plan; -
Figure 11 is a schematic illustration of the step of folding the octagonal blank ofFigure 10 ; -
Figure 12 illustrates an octagonal box produced starting with the blank ofFigure 10 . - With reference to the accompany
Figures 1 - 9 , amachine 1 is described, in particular designed for producing boxes which are not quadrangular. - The
machine 1 comprises abase frame 2 and at least oneturret 3, but usually a plurality of turrets, associated with theframe 2. - Each
turret 3 comprises a sealinghead 4, or presser, designed to stably join the corners of a box being formed by applying a heat-sealed or glued material tape to the corner. - Each sealing
head 4 preferably has an angular profile with an amplitude that differs according to the angle of the corner formed by the lateral walls of the box. - For example, to form quadrangular boxes the
head 4 opening will be 90°, whilst for boxes with a regular hexagonal plan the opening will be 120°. - For this reason, the
sealing heads 4 may be removably associated with theturret 3, so that, depending on the angle formed by the corner of the box to be formed, the mostsuitable sealing heads 4 can be mounted on theturrets 3. - An example of this advantage is given in
Figures 5a, 5b , in which the amplitude of the different corners to be sealed varies noticeably, so that theturrets 3 can be equipped with pressers having a different angle, if necessary contained in a change-over magazine accessible manually or of the automatic type. - The
machine 1 also comprises means 5 for feeding a blank (schematically illustrated inFigure 2 ) acting on thebase frame 2 to feed a blank to a start of forming table 30 in a position between thesealing heads 4. - It should be noticed that the term blank, in the context of this invention, refers to a sheet of paper or
plastic material 31 comprising a plurality ofpre-creasing lines 32 along which the blank is folded to create the box being formed. - The
means 5 preferably comprise astepping elevator 50 with a pick up mechanism (of the known type) which picks upblanks 31 one after another from theelevator 50 and feeds them to aconveyor belt 51 which in turn places the blanks on the table 30. - As is schematically indicated in
Figure 2 , the machine also comprises acounter-mould 10 having the same shape and size as thebase wall 34 of the box to be produced and vertically movable driven by anactuator 33. - During the box folding step, performed in the conventional way, the
counter-mould 10 performs a downstroke until it is positioned over abase section 34 of the blank on the table 30, and drags down the blank until it is positioned on a box forming table 6 below the table 30 and around which thevarious turrets 3 are located. - During this step, the blanks are folded by the combined action of the
counter-mould 10 andfolder elements 7, schematically illustrated inFigure 4 , positioned at and outside the sides of the base section of the box so as to intercept the downstroke of thesides 35 and fold them against themould 10. - Once the
box 36 is on the forming table 6, with the sides drawn near the counter-mould 10 (Figure 4 ), the box closing or sealing step begins, carried out in the known way as theturret 3 sealingheads 4 place strips 52 of heat-sealed or glued material along theopen corners 49. - In accordance with the invention, and in particular with reference to
Figures 3a ,3b ,4 ,5a and 5b , themachine 1 also comprises aturret holder unit 13 associated with eachturret 3 and comprising a "cross carriage" type mechanism consisting of twoslides - Each
turret holder unit 13 can therefore slide in an adjustable way along two directions B, C perpendicular to one another (respectively horizontal/vertical with reference toFigure 5a ) relative to thebase frame 2 and the position of themould 10, so that they adapt to the dimensions of the box to be formed and to the positions occupied by the vertices of thecorners 49 of the box to be sealed. - In the preferred embodiment described, each
turret holder unit 13 is mounted on across-member 53 moved byscrews 75 and in a direction C alongguides 54 fixed on theframe 2. - With this solution each
unit 13 slides in the direction C together with the respective cross-member 53 (first controlled movement), and can also be moved independently in directions B, C (second controlled movement) relative to the position of thecross-member 53, thanks to theslides - In the example described there is a shared cross-member for pairs of two
units 13 positioned on the same side of theframe 2, butindependent cross-members 53 may also be used for eachunit 13. - In more detail, the second independent movement of the
units 13 is controlled by respective first guide means 14, for example worm screws angled in the direction B and acting on theslide 38 and associated with thecross-member 53 so that thefirst slide 38 can slide in an adjustable way on linear prismatic guides located on thecross-member 53. - Again in direction B there are means for adjusting the position of the
slide 38 relative to thecross-member 53. - In the case described (for example,
Figure 5a ) said means consist of a movable adjusting screw 14' integral with thescrew 14 and engaging in a bushing 77 integral with the slide 38 (movement B). - The movement in direction C is adjusted by second guide means 15, for example a worm screw angled in the direction C, associated with the
slide 38 and engaging with theslide 39 in such a way that thesecond slide 39 can slide in an adjustable way on linearprismatic guides 40 located on theslide 38, for movement of theslides - The rotation of the
screws cross-members 53 can be adjusted and controlled automatically or manually with each size change-over for the boxes being produced, depending on the selected machine operating mode. - On the whole, each
unit 13 is therefore capable of two movements in direction B, one approach movement controlled by thescrew 14 and one adjusting movement controlled by the screw 14', and two movements in direction C, one approach movement controlled by movement of thecross-members 53 and one additional adjusting movement controlled by thescrew 15. - According to the invention there is also the possibility of adjusting not just the position in directions B and C, but also the angular position of one or more of the
turrets 3. - For this purpose, with reference to
Figure 3b , aturret 3 is rotatably connected on theunit 13 relative to the position of thecounter-mould 10 and therefore of thebox 36, so that it can define a plurality of directions A1 - An for the sealinghead 4 to approach the box being formed, as is schematically illustrated inFigure 3 . - In the example embodiment described, the
turrets 3 havepins 41 which engage withcircular slots 42 made in the upper surface of theslide 39 and positioned in a circle preferably with a centre R coinciding with the vertex of the sealinghead 4 profile. - In this way, the sealing
head 4 of each rotary turret may be adjusted and angled according to one of the approach directions A, guaranteeing that themachine 1 can produce boxes with corners having different amplitudes and orientation, depending on the shape of the box base wall. - The sealing
head 4 may also be able to slide relative to theturret 3 along each approach direction A to perform the operating stroke. - More particularly, each
turret 3 comprises anactuator cylinder 12 on which the sealinghead 4 is removably connected. Saidactuator 12 therefore allows the sealinghead 4 to slide along the approach direction relative to which theturret 3 is angled, to guarantee that the sealinghead 4 makes contact with the corner to be sealed, applying the necessary pressure on the heat-sealing tape. - Each
turret 3 also comprises means 18 for feeding sealing tapes to each sealinghead 4. - The feed means 18 are of the known type consisting for example of
wheels 60 positioned on eachturret 3 and continuously feeding a measured length of sealingtape 43 between the sealinghead 4 and the corner of the box to be sealed in combination with apressure wheel 61. - Advantageously, each sealing head may have independent feed means, allowing them to feed different lengths of sealing tape for corners of different heights on the same box.
- In the preferred embodiment, said tape is applied by heat-sealing the tape on the corner of the box by heating the sealing
head 4. - However, other embodiments are possible, for example a tape comprising a surface on which there is a layer of adhesive material which is activated by the heat produced by the sealing
head 4. - With reference to
Figure 6 , themachine 1 also comprises means 20 for extracting the formed box, that is to say the box with the sealed corners, acting on the box to move it away from the forming table 6. - The extracting means 20 comprise an extractor element which intercepts the box to move it away from the forming table 6.
- More particularly, the
element 20 advantageously comprises asuction cup 21 at one end of arod 22 guided byvertical guides 47 and moved vertically by adrive unit 46. - In operation, once the
walls 35 of the blank 31 have been lifted by thecontact elements 7 against themould 10, the box being formed has itsbase 36 on the operating table 6, and theopen corners 49 positioned at a distance from the centre O of the base 36 equal to a generic value b, c, respectively in directions B and C. -
Figures 5a and 5b show this step from above. - Therefore, to seal the
open corners 49 theheads 4 must be moved immediately next to the coordinates (b, c) point. - According to the invention, this movement occurs with an approach motion consisting of a first movement of the cross-members 53 in direction C, then independent adjustment in directions C, B of each
turret 3 by the adjusting means 14, 40 acting on theslides -
Figure 5b shows the advantage gained from independent adjustment of all of theunits 13, allowing sealing of boxes with any irregular plan (for example without axes of symmetry), in which the amplitude of the coordinates (b, c) of thecorners 49 to be sealed may be significantly different from one another, both for quadrangular and generically polygonal boxes. - Once the
heads 4 have been drawn near the corners to be sealed 49, thehead 4actuators 12 can perform the operating stroke in direction A and seal the open corners with the heat-sealing tapes. - Advantageously, in the embodiment in
Figure 3b , it is also possible to adjust the angular orientation of thehead 4, so that the direction A of the operating stroke coincides with the bisecting line of thecorner 49 and improve the uniformity of the pressure applied by thehead 4 on the sides adjacent to thecorner 49. - In a different embodiment, the angular orientation of the
heads 4 is given not by an adjustment, but by the preset position of one or more heads, angled without the possibility of oscillating so as to make the direction A of the operating stroke coincide with the best bisecting line of thecorner 49 for sealing a predetermined corner of the box. In this case, for sealing polygonal boxes a set of one ormore heads 4 may be installed, set up to have operating directions with different angles and corresponding to the geometry of the box to be formed. - Finally, once the box has been sealed, the
suction cup 21 makes contact with the base wall of thebox 36 and stably connects with it to allow the formed box to be moved from the forming table 6 to an extraction table 45, so that another blank 31 can be fed and a new box formed. - With reference to
Figures 7a - 7c ,blanks 31 are described for the production in quadrangular automatic machines of boxes with more than four sides. - Each blank 31 consists of a single body comprising a
polygonal base 34 and a number ofindividual walls 35/35' overall equal to the number of sides of thebase 34. - In conventional quadrilateral geometry, each
wall 35 of the blank 31 is joined to thebase 34 by afold line 32 in such a way that once the blank has been folded in the quadrangular machine, the sealing heads can seal the fouropen corners 49 to obtain a box closed at all its corners, on the base and lateral. - The blanks of the invention, illustrated by way of example in
Figures 7a - 7c , have at least oneside 55 of the base 34 free, and at least one wall 35' joined both to thebase 34 by afirst fold line 32 and to at least asecond wall 35 by asecond fold line 56 converging with and at a right angle to theline 32, so as to constitute at least onemultiple part 57. - In the example in
Figure 7a , the blank 31 has apentagonal base 34 joined by twofold lines 32 to twomultiple walls 57 consisting respectively of two and threeadjacent walls 35/35'. - In the example in
Figure 7b , the blank has ahexagonal base 34, joined by twofold lines 32 to two symmetrically oppositemultiple walls 57, both consisting of threeadjacent walls 35/35'. - In the example in
Figure 7c , the blank has anoctagonal base 34, joined by twofold lines 32 to twomultiple walls 57 joined to two opposite sides of thebase 34 and each consisting of threeadjacent walls 35/35'. In this case the blank is completed by twosingle walls 35 joined to the opposite sides of the base 34 at right angles to the sides joined to the multiple walls. - In all of the cases described, and in the other configurations possible, the number of
multiple walls 57 is determined in such a way that folding the blank 31 on the counter-mould 10 results in the formation of a box with a number ofopen corners 49 less than or equal to four and therefore suitable for sealing in a quadrangular machine. - Advantageously, using a machine in accordance with the invention the independence of the sealing head movements makes it easy for the sealing heads to approach the
open corners 49, whatever the polygonal geometry of the box. -
Figure 8 is a schematic illustration of the folding step immediately before sealing of the corners of an octagonal blank with a machine in accordance with the invention. - In this case, the folding means comprise a
contact profile 7 at a first wall 35' for folding the wall 35' on aside 70 of the counter-mould 10 during its downstroke, andadditional contact profiles 72 acting at thewalls 35 which are open at an angle. - The
contact 7 preferably consists of a bar positioned above folding profiles 72 in turn consisting of curved tubular elements with astretch 73 acting in the vertical direction on thewall 35 and asecond stretch 74 acting in a direction at a right angle to theangled side 71 of themould 10. - In operation, during the
mould 10 downstroke the walls 35' encounter thebar 7, beginning to fold towards theside 70, until thewalls 35 encounter thestretch 73 and then thestretch 74 of theprofile 72 and are drawn near theangled sides 71 of the mould. - As the box downstroke continues, the walls 35' on axes at a right angle to the walls 35' already folded by the
bars 7 encounter second bars 7' positioned at a lower level and which, in a known way, fold the remaining walls 35' against corresponding sides 70' of themould 10, completing box closure so that theheads 4 can seal the open corners of the box. -
Figure 8 illustrates the case of an octagonal box, but it shall be understood that the same solution may be applied to boxes with more than four sides, in which the sides of the base form included angles a with different amplitude. -
Figures 10 - 12 illustrate a polygonal blank in accordance with the invention, in detail an octagonal blank 81, and apolygonal box 88 obtained from the blank. - The blank 81 comprises a
base 80 andperipheral sections 82 positioned at correspondingsides 83 of the base 80 intended to constitute the walls of thebox 88 when lifted. - In particular, at least two
sections 82 are joined tosides 83 which are adjacent to the same includedside 86, and eachlateral section 82 consists of acentral portion 84 joined to theside 83 andlateral portions 85 which can be opened by turning relative to thecentral section 84 and are smaller than the includedside 86, preferably half the size of it. -
Figure 11 provides a schematic illustration of the blank folding step, in which thefolders 7 lift thesections 82, folding them relative to thesides 83, to form thebox 88. - During this step, the
lateral portions 85 are folded relative to theportion 84 so as to drawn near one another along intermediate lines M of the wall of thebox 88, that is to say, not coinciding with the corner of the box, and preferably coinciding with the median line of the wall. - During box formation, along the line M a seal S is applied, for example a heat-sealed strip of the type already described, using sealing
heads 4 with a 180° flat pressure profile, that is to say, suitable for appropriately pressing the sealing strip S on the walls of the box rather than at the corners. - Advantageously, in the example described, the blank is a regular octagon, therefore the
heads 4 can have a shared approach direction L passing through a centre C of the base so as to apply a balanced stress on the structure of the machine which supports it during the sealing step. - However, in the case of different geometries, octagonal, hexagonal or other, the lines L may also not pass through the geometric centre C of the box.
- In the example described there are also four seals S on corresponding opposite walls of an octagonal box and positioned along two approach directions L at a right angle to one another.
- A method according to the invention for producing packing boxes with a polygonal plan having a base and lateral sections which can be folded relative to the base, comprises:
- a step of folding the lateral sections to constitute the walls of the box when lifted,
- a step of sealing the lateral walls to one another, in which at least one seal is made along a lifted intermediate line of at least one wall.
- The method preferably involves making at least two seals positioned at the ends of one or more shared lines (L), at right angles to one another if necessary.
- It must be emphasised that production of the octagonal box formed in this way may advantageously be carried out using a conventional quadrangular machine equipped with
flat profile pressers 4. - The invention is described above with reference to a preferred embodiment, although it shall be understood that equivalent modifications may be made without it thereby departing from the scope of the inventive concept.
Claims (14)
- A machine for forming boxes (36) starting from hat blanks (31) consisting of a base with multiple sides (34) and the same number of lateral faces (35) joined to the base by creasing lines (32), the machine comprising a counter-mould (10) having the same shape in plan view as the base (34) and folder elements (7, 7') for folding the lateral faces (35) on the counter-mould (10) forming one or more box (36) open corners (49), and also comprising a plurality of turrets (3) movable relative to the counter-mould (10), each turret having a sealing head (4) for applying a sealing tape on said open corner, wherein each turret (3) can move independently of the movement of at least one other turret (3) relative to the counter-mould (10) along at least two directions (B, C) perpendicular to one another, the machine being characterised in that
each turret (3) is mounted on a cross-member (53) which can slide relative to the counter-mould in a direction (C), independent cross-members (53) being provided for each turret (3), so that each turret (3) can move independently of the movement of every other turret (3) relative to the counter-mould (10) along at least two directions (B, C) perpendicular to one another. - The machine according to claim 1 wherein one or more of the turrets (3) can rotate about its vertical axis of rotation relative to the counter-mould (10) so that it can define a plurality of sealing head (4) approach directions (A) to the corner (49) of the box being formed (36).
- The machine according to claim 2 wherein each turret (3) is supported by a turret holder unit (13) movable in a first direction (B) by first adjusting means (14') along a cross-member (53) in turn comprising second guide means (54) and adjusting means (75) acting in a second direction (C) perpendicular to the direction (B) for moving the turret holder unit (13) in an adjustable way along the two directions (B, C).
- The machine according to claim 3 wherein each turret holder unit (13) constitutes a cross carriage structure comprising a first slide (38) movable in the first direction (B) relative to the cross-member (53) and a second slide (39) able to slide relative to the first in the direction at a right angle to it (C).
- The machine according to claim 4 wherein the second slide (39) has additional guide means (40) and adjusting means (15) for the position relative to the first slide (38) in at least one direction (B, C).
- The machine according to any of the foregoing claims wherein at least one turret (3) can rotate relative to the counter-mould (10) by means of pins (41) engaging with circular slots (42) made in the upper surface of the slide (39).
- The machine according to any of the foregoing claims wherein each sealing head (4) is slidably connected to the respective turret (3) along the approach direction (A) to the box being formed.
- The machine according to any of the foregoing claims, comprising means (18) for feeding a blank, acting on the base frame (2) for feeding a blank between the sealing heads (4).
- The machine according to any of the foregoing claims, comprising a box forming table (6) integral with the base frame (2) and controlled by the blank feed means (5).
- The machine according to any of the foregoing claims wherein the blank folding means (7) operate on the box forming table (6).
- The machine according to any of the foregoing claims wherein the sealing heads (4) are removably associated with the respective turrets (3).
- The machine according to any of the foregoing claims wherein each turret (3) comprises independent means (18) for feeding sealing tapes to the sealing head (4), for sealing and closing the corners (49) of the box being formed.
- The machine according to any of the foregoing claims, comprising means (20) for extracting the formed box, operating on the box to move the formed box away from the forming table (6), wherein the extracting means (20) comprise a suction cup extractor element for intercepting the formed box and moving it away from the forming table (6).
- The machine according to any of the foregoing claims wherein there is a magazine for sealing heads (4) having different angles relative to the vertical, for closing erect box corners (49) having walls at an angle to a horizontal axis.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITBO20060337 ITBO20060337A1 (en) | 2006-05-08 | 2006-05-08 | MACHINE FOR FORMATION OF BOXES |
ITBO20060785 ITBO20060785A1 (en) | 2006-11-20 | 2006-11-20 | LOCKED FOR THE FORMATION OF PACKAGING BOXES, BOX AND ITS FORMATION METHOD. |
PCT/IB2007/001169 WO2007129201A2 (en) | 2006-05-08 | 2007-05-07 | Machine for forming packing boxes, blank and packing box |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2018264A2 EP2018264A2 (en) | 2009-01-28 |
EP2018264B1 true EP2018264B1 (en) | 2014-07-09 |
Family
ID=38578695
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07734485.1A Not-in-force EP2018264B1 (en) | 2006-05-08 | 2007-05-07 | Machine for forming packing boxes |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP2018264B1 (en) |
WO (1) | WO2007129201A2 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITBO20060338A1 (en) | 2006-05-08 | 2007-11-09 | Emmeci Srl | COVER FOR PACKAGING BOXES |
IT1398601B1 (en) * | 2009-02-19 | 2013-03-08 | Emmeci Spa | APPARATUS AND PROCEDURE TO COVER A BOX WITH A NUMBER OF SIDES MORE THAN FOUR. |
IT1392865B1 (en) * | 2009-02-19 | 2012-04-02 | Emmeci Spa | APPARATUS AND PROCEDURE TO COVER A BOX WITH A BOTTOM WALL WITH A NUMBER OF SIDES MORE THAN FOUR. |
ITBO20120029A1 (en) | 2012-01-25 | 2013-07-26 | Emmeci Spa | GLUING DEVICE FOR A BOX FORMING MACHINE AND ITS GLUING METHOD |
CN102700769B (en) * | 2012-05-29 | 2014-04-23 | 东华大学 | Packaging machine for green and environment-friendly crease paper box |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3010639A (en) * | 1958-07-30 | 1961-11-28 | Charles A Govatsos | Beaded box blank and bead-sealed box |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB325741A (en) * | 1929-04-15 | 1930-02-27 | Gregory Brodsky | Improvements in four corner box staying machines |
US2641973A (en) * | 1945-09-15 | 1953-06-16 | Henry Russell Davis Jr | Machine for making paper boxes |
ITBO20040388A1 (en) * | 2004-06-21 | 2004-09-21 | Europrogetti Srl | DEVICE FOR THE FORMING OF BOXES |
-
2007
- 2007-05-07 WO PCT/IB2007/001169 patent/WO2007129201A2/en active Application Filing
- 2007-05-07 EP EP07734485.1A patent/EP2018264B1/en not_active Not-in-force
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3010639A (en) * | 1958-07-30 | 1961-11-28 | Charles A Govatsos | Beaded box blank and bead-sealed box |
Also Published As
Publication number | Publication date |
---|---|
EP2018264A2 (en) | 2009-01-28 |
WO2007129201A2 (en) | 2007-11-15 |
WO2007129201A3 (en) | 2008-05-08 |
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