EP0388649B1 - Machine à plier - Google Patents

Machine à plier Download PDF

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Publication number
EP0388649B1
EP0388649B1 EP90103384A EP90103384A EP0388649B1 EP 0388649 B1 EP0388649 B1 EP 0388649B1 EP 90103384 A EP90103384 A EP 90103384A EP 90103384 A EP90103384 A EP 90103384A EP 0388649 B1 EP0388649 B1 EP 0388649B1
Authority
EP
European Patent Office
Prior art keywords
folding
belt
profile
belts
axes
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.)
Expired - Lifetime
Application number
EP90103384A
Other languages
German (de)
English (en)
Other versions
EP0388649A1 (fr
Inventor
Ernst Grau
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.)
Wilhelm Bahmueller Maschinenbau Praezisionswerkzeuge GmbH
Original Assignee
Wilhelm Bahmueller Maschinenbau Praezisionswerkzeuge GmbH
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.)
Filing date
Publication date
Application filed by Wilhelm Bahmueller Maschinenbau Praezisionswerkzeuge GmbH filed Critical Wilhelm Bahmueller Maschinenbau Praezisionswerkzeuge GmbH
Publication of EP0388649A1 publication Critical patent/EP0388649A1/fr
Application granted granted Critical
Publication of EP0388649B1 publication Critical patent/EP0388649B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • B31B2100/00—Rigid or semi-rigid containers made by folding single-piece sheets, blanks or webs
    • 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
    • B31B2100/00—Rigid or semi-rigid containers made by folding single-piece sheets, blanks or webs
    • B31B2100/002—Rigid or semi-rigid containers made by folding single-piece sheets, blanks or webs characterised by the shape of the blank from which they are formed
    • B31B2100/0022—Rigid or semi-rigid containers made by folding single-piece sheets, blanks or webs characterised by the shape of the blank from which they are formed made from tubular webs or blanks, including by tube or bottom forming operations
    • 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
    • B31B2120/00—Construction of rigid or semi-rigid containers
    • B31B2120/30—Construction of rigid or semi-rigid containers collapsible; temporarily collapsed during manufacturing
    • 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
    • B31B50/58—Folding sheets, blanks or webs by moving endless belts or 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
    • B31B50/62—Uniting opposed surfaces or edges; Taping by adhesives
    • B31B50/622—Applying glue on already formed boxes
    • 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
    • B31B50/68—Uniting opposed surfaces or edges; Taping by stitching, stapling or riveting

Definitions

  • the invention is based on a device with the features of the preamble of claim 1, which is provided for folding folding box blanks.
  • Folding box blanks are flat corrugated cardboard blanks that have the shape of the processing of the finished folding box. These folding box blanks have to be formed into folding box hoses, which have edges connected to one another along a line, so that they can be erected as carton during packaging. For this purpose, the folding box blanks are bent inwards along fold lines which form two edges on the erected box or the cardboard box, which lie diagonally opposite and extend between the bottom and the lid.
  • the parts to be folded inwards are called side flaps and are on the one hand a narrow flat side and on the other hand a wide flat side of the later carton. Large flaps hang from these side flaps, which form parts of the base or lid and with them the middle piece, which remains at rest when folded, is only connected via the later side walls.
  • folding straps were used to fold in or fold in these side flaps to form the folding box hose, which have a screwed course.
  • the side flap which initially lies flat, is grasped synchronously with the forward movement from below and folded over according to the degree of advance by the machine. Because of the arrangement of the folding straps, their surface contacting the side flap forms a straight helical line, which ensures that the leading edge of the folding box blank is already folded inward more than the trailing part.
  • EP-PS 0086153 In order to avoid this "fishtailing", it is known from EP-PS 0086153 to put so-called pressure feeders on the folding straps in order to introduce the force approximately in the middle, based on the folding line, on the side flap.
  • the pressure feeder has a height opposite the back of the folding belt that compensates for the incline of the folded folding belt, so that only the The top of the feeder rests against the side flap and the side flap has no contact with the folding strap.
  • the folding belt in the known machine must be supported and guided so as not to be pushed back too much. Nevertheless, the folding belt dodges between the support rollers, whereby a small oscillating movement is superimposed on the actual folding movement. This causes the side flap to swing at the high speeds of modern folding machines.
  • the vibrations are practically not dampened due to the punctiform loading of the side flap and can lead to the side flap kinking above the pressure feeder in the case of large cuts of poor quality.
  • There is also a risk that the bottom or lid part sitting on the side flap will get too far inward as a result of the vibrations and the air resistance and will be supported on the center piece. The consequence of this is an oblique folding line that can no longer be aligned later.
  • the long, at least line-shaped contact between the side flap and the respective folding strap also considerably reduces the risk of the side flap breaking off because the folding force is introduced over a larger area.
  • a particularly good support is achieved if the vertex of each sawtooth, which the profile forms in longitudinal section, is at a distance from the preceding minimum that is equal to or greater than the distance to that on the vertex in the direction of movement, with respect to the direction of movement of the folding belt following minimum, because then large folding box blanks are supported over an area that is more than half the length of the side flap, viewed in the direction of transport.
  • two different arrangements of the folding straps can be used to fold in the side flaps.
  • the folding straps can either be twisted or twisted run, the folding belt runs around two axes that are at an angle to each other, which corresponds approximately to the amount of the expected folding or the folding belts can run around axes that are aligned substantially parallel to one another, so that the belt runs straight and unimpeded.
  • a somewhat greater force is exerted on the straps, but with this arrangement it can be achieved that the contact surface, in relation to the side flap to be folded, remains at rest.
  • the belt is practically not subjected to torsion, but the side flap must simultaneously perform a movement transversely to the folding belt during the folding movement, as a result of which the surface of the profile is subjected to abrasion.
  • the aforementioned advantages are achieved and in any case the folding belts run relatively evenly around the end axes, which is not the case when using pressure feeders of the known type. Sudden radial accelerations occur with the corresponding bearing load and noise.
  • the contact surface or part of the contact surface is designed such that when the apex of the profile lies above the axis which is the most upstream, a surface is created which is identical to the starting position of the side flap in this position.
  • the resulting flat surface remains up to the next pulley.
  • the folding arrangement requires two folding straps one behind the other on each side of the device.
  • the length can be found with a single folding belt on each side, but a somewhat more complicated course arrangement has to be accepted in order to get around the edge of the blank or around the folding line.
  • a folding belt that is light and easily runs around the end axes is obtained if on the back of the folding belt instead of a full profile only at least one bar designed according to the profile is provided, the narrow side of which points away from the back of the belt forms the contact surface.
  • the bending resistance when deflecting around the end axes can be reduced even more if the bar on the back of the folding belt has a wave-like or meandering course.
  • a particularly stable contact surface can be obtained if two corrugated or meandering strips are provided on the back of the folding belt, which are preferably arranged so that they collide with their convex bulges facing one another over the center of the folding belt.
  • a folding machine 1 is shown in perspective and highly schematic, which is used to convert incoming and initially flat folding box blanks 2 into folding box hoses 3 so that the overlapping edges are permanently connected to one another in a subsequent station, not shown, by means of an adhesive or staples .
  • FIG. 1 only those parts are shown which are necessary for understanding the invention, on the other hand to maintain clarity. Otherwise the important details would be lost in the diversity of the lines.
  • the folding machine 1 contains on the top of a horizontally and straight extending underframe or frame, which is not further illustrated, two parallel guide rails 4, the tops of which are at the same height and form 5 slideways or guideways on which the folding box blanks 2 relate 1 coming from the right are moved to the left by the folding machine 1.
  • a transport device is provided, of which two toothed belts 6 running parallel and at a distance from one another are visible between the guide rails 4.
  • the top or back of the two toothed belts 6 lies in the plane which is defined by the guideways 5 and carries drivers 7, the distance from which, viewed in the longitudinal direction of one of the respective toothed belts 6, corresponds to the center distance of two successive folding box blanks 2.
  • the two toothed belts 6 run around the end around deflection pulleys 8 and 9, which are rotatably mounted on axes 11 and 12 in the base frame (not shown) at the beginning and end of the folding machine. From these deflection rollers 8, 9, the deflection rollers 9 are free running and the deflection rollers 8 are driven in general machine cycle so that the toothed belts 6 are driven synchronously with one another and synchronously with the other movements of the folding machine.
  • the folding machine 1 has two endless folding belts 13 and 14, which in their general extent begin laterally below the guide track 5 and end above the guide track 5.
  • the two folding belts 13, like the two folding belts 14, are arranged in mirror symmetry with respect to the longitudinal axis of the folding machine 1.
  • the folding belt 13 on the left side of the folding machine 1, viewed in the direction of movement of the folding box blanks 2, runs around two pulleys 15 and 16 which are rotatably mounted on axes 17 and 18 of the base frame.
  • One of the pulleys 15 and 16 is coupled to a drive device in order to move the folding belt 13 synchronously with the toothed belt 6.
  • the axes 17 and 18 run parallel to one another and at an angle of 45 ° to the plane defined by the guideways 5.
  • the orientation of the axes 17 and 18 is such that they point downwards towards the plane of symmetry of the folding machine 1, i.e. under the guide rails 4.
  • the folding belt 14 following in the transport direction of the folding box blanks 2, like the folding belt 13, is endless and essentially extends the folding belt 13.
  • the folding belt 14 runs around two end pulleys, of which only one their axes of rotation 21 and 22 are illustrated schematically.
  • the axes of rotation 21 and 22 are parallel to one another and at right angles to the axes of rotation 17 and 18 of the folding belt 13.
  • the two axes of rotation 22 of the two folding belts 14 lie in a common plane and converge towards the top.
  • a working strand 23 or 24 is formed on each of the folding belts 13, 14, which runs in the direction of the transport movement of the folding box blanks 2 or the folding box hose 3 and interacts with the folding box blank 2, while an empty strand 25 , 26 runs empty in the opposite direction without touching the folding box blank 2.
  • the folding box blanks 2 When they get into the folding machine 1, the folding box blanks 2 initially lie completely flat, as shown in FIG. 1 on the right-hand side. They consist of a middle piece 27 and two side flaps 28 and 29 connected to it in one piece. The side flaps 28 and 29 abut the middle piece 27 on fold lines 31 and 32, which may be pre-grooved, and form two diagonally opposite edges in the finished erected carton, from the floor reach to the lid.
  • the folding box blank 2 contains four slots 33 which extend a little way into the folding box blank 2 and which later folds over allow a bottom or lid flap 34.
  • hold-down devices which have a plurality of loosely rotatable wheels with a disk-shaped or conical shape.
  • the loosely rotatable wheels 36 run on axes 37 which are approximately at 45 ° and are oriented such that the outer circumferential surface of the wheels 36, which are seen above the guideways 5, in the immediate vicinity of the folding lines 31, 32 the folding box blank 2 touch.
  • the middle piece 27 is thereby pressed directly next to the fold lines 31, 32 onto the guideway 5 and cannot be lifted upwards when the side flaps are bent from the flat-lying position into the position shown in the middle in FIG. 2 is.
  • the axles 37 of the wheels 36 are mounted in a frame, not shown, which is connected to the base frame of the folding machine 1 via a bridge frame, also not shown, so that the folding box blanks 2 can run freely.
  • the profile 19 on the back of the folding straps 13, 14 is now explained below with reference to FIGS. 2 to 9.
  • the profile is sawtooth-shaped and is located on the back of a toothed belt 49, which ensures the positive and thus slip-free movement of the folding belts 13, 14.
  • the sawtooth-shaped profile 19 consists of a comparatively slightly inclined bearing surface 39 and a strongly inclined rear surface 41. Between the bearing surface 39 and the rear surface 41 there is an apex 42 of the profile, while the rear surface 41 and the bearing surface 39 are delimited by two minima 43 at the other two ends.
  • This profile shape is arranged several times along the folding belt 13, 14, the distance between two minima 43 having the center distance of two successive folding box blanks 2, which, viewed in the direction of transport of the folding box blanks 2, have the maximum dimensions that can be processed on the folding machine 1.
  • the support surface 39 which runs obliquely with respect to the front side 38 of the folding belt, which supports the teeth
  • the oblique angle at which the working strand 23 passes relative to the side flap 28 or 29 in the starting position or end position is compensated, the starting position being understood as that position , in which the side flap 28 or 29 passes through the axis 18, while the end position is the position which the side flap 28, 29 assumes when it is moved past the axis 17.
  • This avoids that the leading floor or lid flap 34 is prematurely bent inwards in the region of the slot 33 by the obliquely rising working strand 23 and is supported on the middle piece 23.
  • the left folding belt 13 is shown in a view from the center of the machine.
  • the length is chosen so that the working strand 23 contains two "saw teeth”.
  • the bearing surface 39 is divided into two partial bearing surfaces 44, 45, which merge into one another on a comb 46 running in the longitudinal direction of the folding belt 13, which at the selected position of the axes 17, 18 extends over the center of the folding belt 13.
  • This comb 46 extends from the minimum 43 to the apex 42, while for reasons of material savings and because of the stability the profile 19 on the rear surface 41 is flattened, as shown.
  • a flat-lying folding box blank 2 is pulled off a stack and pushed onto the guideways 5 from the right, based on FIG. 1.
  • the timing between the folding belt 13 and the folding box blank 2 to be advanced is chosen such that when its leading edge passes through the plane defined by the axes 18, a minimum 43 of the two folding belts 13 has already passed this plane so that the The front edge of the folding box blank 2 does not abut a rear side 41.
  • the working strand 23 of both folding belts 13 moves horizontally at the same speed as the folding box blank 2, which, as soon as it has completely reached the guideways 5, from the transport belts 6 and their drivers are taken over and advanced at a constant speed.
  • the apex is so high with respect to the toothed front of the folding belt 13 that the partial contact surface 44 running at an angle of 45 ° to the front of the folding belt 13 does not intersect the flank of the folding belt 13 even in the region of the minimum 43.
  • the folding belt 13 therefore has the same width throughout its entire length.
  • the downstream deflection roller 15 lies above the plane defined by the guideways 5.
  • the height of the deflection roller 15 above the guideway 5 corresponds to the distance that the deflection roller 16 has from the folding line 31 of the incoming folding box blank 2.
  • the roll 15 has moved closer to the fold line 31, so that when the folding box blank 2 with its side flap 28 passes the deflection roll 15, the side flap 38 is bent so as to project vertically upward.
  • the folding box blank 2 is pushed forward at a constant speed, the working strand 23 rising obliquely to the folding line 31 gradually pushes the side flap 28 upwards to the extent that the folding box blank 2 is pushed forward.
  • the wheels 36 which are omitted from FIG. 2 for the sake of clarity, hold the center piece 27 on the Guideways 5 down.
  • the second partial bearing surface 45 is designed such that it runs around the deflecting roller 15 with its respective outer or underside of the side flap 28 abuts the entire area. This is achieved in a fairly good approximation if it is mirror-symmetrical with respect to the longitudinal axis of the folding belt 13 with respect to the partial support surface 44 and includes an angle along the straight comb 46 with the partial support surface 44 which corresponds to the angle by which the side flap 28 is set up, when she passes the pulley.
  • the deflection roller 15 In order to avoid excessive inward bending, the deflection roller 15 must of course be offset with its outer circumferential surface with respect to the fold line 31 to the outside by an amount which corresponds to the height of the apex from the front of the folding belt 13.
  • the subsequent folding belt 14 serves to bend the vertically projecting side flaps 28, 29 inwards so that their free edges overlap and the desired folding box hose 3 is created.
  • the folding straps 14 therefore have the same structure as the folding straps 13, which is why the same reference numerals are used in FIG. 3 for the designation.
  • Only the deflection rollers are arranged somewhat differently so that on the one hand the side flaps 28, 29 initially do not experience any change in position when passing through the axis 21 and are pressed down by the partial contact surface 45 on the center piece 27 when passing the axes 22.
  • the outlet-side deflection roller 22, which has the axis 22, is therefore seated above the adjacent guideway 5 at a distance from the folding line 31 which corresponds to the desired point of attack on the side flap 28, 29.
  • the height of this deflection roller above the guideway 5 is equal to the thickness of the folding belt 14 at the apex 42.
  • the profile 19 described above is not solid in a preferred embodiment, for example formed from a closed-cell foam, but, as shown in FIG. 5 shows, it consists of two strips 51 and 52 applied to a flat rear side 48 of a toothed belt 49, which run in a meandering shape in the longitudinal direction of the toothed belt 49 and are firmly attached, for example by welding. Their free edges 53 and 54 form the actual contact surfaces against which the side flaps 28, 29 rest.
  • the meandering strips 51 and 52 are therefore cut according to the profile described above.
  • 6 to 9 show perspective sections of the belt 49, which is cut in accordance with the previously described description of the profile. 6 shows a section as it occurs in the vicinity of the minimum 43.
  • the comb 46 is located above the center of the toothed belt 49, where the inwardly convex loops of the two strips 53 and 54 collide with their apices 55 and 56.
  • the strips 53, 54 are not connected to one another at these points in order not to impair the elasticity of the folding belt 13. Starting from this comb 46, which is at the greatest distance from the rear side 48, both strips 53, 54 are beveled towards the edges of the toothed belt 49 corresponding to the two partial contact surfaces 44, 45.
  • FIG. 9 finally shows a section of one of the folding belts 13, 14 from the area of the rear surface 41, in which, for reasons of strength and wear, a plateau surface 57 is formed which separates the extensions of the partial bearing surfaces 44, 45 from one another.
  • the new folding belt profile can not only be used on folding machines 1 in which, as the previous explanations show, the two folding belts 13, 14 run straight without restriction, but, as can be seen in the following FIGS. 10 and 11, a restricted arrangement of the Folding straps 13, find use.
  • the construction of the folding machine is fundamentally exactly the same as that of the folding machine 1 according to FIG. 1, which is why no further overview is shown and only the changed arrangement of the folding belts 13 , 14 in Figs. 10 and 11.
  • This representation corresponds in the consideration of the representation in FIGS. 3 and 4. Since to implement the embodiment according to 10 and 11 the same parts are used, these are also provided with the same reference numerals as above.
  • the folding belt 13 runs, i.e. the upstream folding belt, at the entrance of the folding machine, around two deflection rollers 15, 16, the axes 17 and 18 of which are perpendicular to one another.
  • the axis 18 lies in a horizontal plane below the guideway 5 and at such a distance that the apex 42 of the profile 19 lies in the plane defined by the guideways 5 when it intersects the plane containing the axes 18 and on the guideway 5 is vertical.
  • the support surface 39 which is undivided here, forms a flat surface which lies in the reference plane defined by the guideways 5.
  • a side flap 28 resting on this bearing surface 39 is therefore supported without the front edge being raised more than the rear edge.
  • the other deflecting roller 16 is located laterally next to and above the adjacent guideway 5 on the vertically extending axis 17.
  • the axis 17 has a lateral position which is selected so that when the folding box blank 2 passes, the apex 42 running over the deflecting roller 15 has a vertical plane touched, which goes through the fold line 31.
  • the same profile is used in the subsequent folding belt 14 according to FIG. 11, only the axes 21, 22 are oriented differently.
  • the position of the axis 21 is, with the exception of the fact that it is somewhat further downstream, the same as the position of the axis 17.
  • the axis 22, however, is above the guide track 5 and the associated deflection roller 22 'is, based on the folding line 31, for Center of the folding machine 1 shifted so that the compressive force can be introduced to the left folding belt 14 to the right of the folding line 31.
  • the height of the axis 22 above the guideway 5 corresponds to the radius of the deflection roller 22 plus the height of the apex 42 above the front side 38 of the toothed belt 49.
  • the first folding belt 13 sets the side flap vertically because each point of the support surface 39 moves upwards along an ascending helix.
  • the second folding belt 14 then bends a side flap 28 onto the middle piece 27.
  • FIGS. 12 to 14 show sections of the folding belts 13 and 14, which are constructed in the same way as the folding belt from FIG. 5 or the following FIGS. 6 to 9, the strips being cut differently only according to the changed profile .
  • 12 shows a section near the minimum 43.
  • the flat bearing surface 39 touches the upper side 48 of the toothed belt 49 on the flank of the toothed belt 49 lying away from the center of the folding machine 1. Starting from here, the bearing surface 39 rises correspondingly to the flank lying towards the center of the machine the twist of the working strand 23.
  • Fig. 13 is a piece closer to the apex 42 the folding belt 13, 14 shown.
  • the contact surface 39 is a little further away from the rear surface 48 and, moreover, has a somewhat more acute angle to the rear side 48 compared to the piece from FIG. 12.
  • the cutout of the belt 13, 14, which 14 is shown, is finally almost at the apex 42, which is why the bearing surface 39 has only a very slight inclination with respect to the rear 48.
  • the support surface runs parallel to the rear side 48, as shown in FIG. 15. From FIG. 12 to FIG. 15, the distance that the center of the contact surface 39 has from the rear side 48 has continuously increased to the maximum value.
  • the folding belt 13, 14 according to FIGS. 12 to 15 has the same cross-sectional shape as shown in FIG. 4.
  • each of the two side flaps 28, 29 it is also possible to bend each of the two side flaps 28, 29 by 180 ° with a single folding belt, if the folding belt is chosen to be long enough and the axes around which the respective folding belt runs are almost parallel to one another. In such a case, the work strand rotates in space by 180 ° when it moves from one axis to the other. The side flap is taken accordingly.

Landscapes

  • Making Paper Articles (AREA)
  • Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)
  • Seal Device For Vehicle (AREA)
  • Air Bags (AREA)

Claims (15)

1. Dispositif (1) pour le pliage de découpes de boîtes pliantes (2) plates à l'état d'origine, qui présentent une partie centrale (27) ainsi que des panneaux de côté (28, 29) liés à la partie centrale (27) devant être pliés le long d'une ligne de pliage (31) en direction de la partie centrale (27), comportant un bâti qui sert à l'articulation et au support de moyens de guidage et d'entraînement (4, 6) à l'aide desquels les découpes de boîtes pliantes sont déplacées de manière régulière, dans la même position, avec un certain intervalle entre elles, à travers le dispositif (1), ainsi qu'au moins deux courroies de pliage (13, 14) sans fin souples, qui s'étendent essentiellement dans la direction de transport des découpes et qui circulent chacune sur deux axes (17, 18, 21, 22) éloignés l'un de l'autre, sensiblement perpendiculaires aux lignes de pliage (31), les courroies de pliage (13, 14) qui circulent de manière synchrone avec le déplacement des découpes (2) faisant pivoter les panneaux de côté (28, 29), à partir du plan de la partie centrale (27), autour de la ligne de pliage (31) servant d'axe de pivotement dans la proportion du déplacement de la découpe concernée dans la direction de transport des découpes (2) en relation avec les courroies de pliage (13, 14), caractérisé en ce que chaque courroie de pliage (13, 14) est munie, sur sa face arrière (48) orientée radialement vers l'extérieur par rapport aux axes (17, 18, 21, 22) autour desquels tourne la courroie de pliage (13, 14) concernée, d'un profil (19) formant une surface d'appui (39) pour un panneau de côté (28, 29) concerné, lequel profil a, dans la direction longitudinale de la courroie de pliage (13, 14), en coupe longitudinale, une forme de dent de scie et comporte au moins un sommet (42) qui, dans le profil (19) coupé axialement, présente la plus grande distance par rapport à la face avant (38) opposée à la face arrière (48), ainsi qu'un minimum (43) qui, dans le profil (19) coupé axialement, présente la plus faible distance par rapport à la face avant (38), et en ce que la surface d'appui (39) est située entre le minimum précédent (43) et le sommet suivant (42).
2. Dispositif selon la revendication 1, caractérisé en ce que le profil (19) forme, en vue en coupe longitudinale, entre le sommet (42) et le minimum suivant (43) une contre-surface (41) inclinée.
3. Dispositif selon la revendication 1, caractérisé en ce que chaque courroie de pliage (13, 14) présente, dans la direction longitudinale, plusieurs sommets (42) et des minima (43) correspondants, chaque portion du profil (19) qui commence par un minimum (43), englobe un sommet (42) et se termine avec le minimum (43) suivant formant une dent de scie, et en ce que la distance entre deux minima (43) voisins est supérieure ou égale aux dimensions des découpes de boîtes pliantes (2) mesurées dans la direction parallèle aux lignes de pliage (31).
4. Dispositif selon la revendication 1, caractérisé en ce que, par rapport à la direction de déplacement de la courroie de pliage (13, 14), le sommet (42) de chaque dent de scie est situé à une distance du minimum (43) précédent égale ou supérieure à la distance le séparant du minimum (43) venant après dans la direction de déplacement.
5. Dispositif selon la revendication 1, caractérisé en ce que les deux axes (17, 18, 21, 22) autour desquels tourne la courroie de pliage (13, 14) concernée forment un angle entre eux de manière telle que la face avant (38) des sections de courroies situées entre les axes (17, 18, 21, 22) forme une hélice rectiligne et en ce que la face d'appui (39) du profil (19) est située dans le même plan que le panneau de côté (28, 29) correspondant de la découpe (2) concernée, lorsque le sommet (42) se trouve sur l'un des axes (18, 21).
6. Dispositif selon la revendication 5, caractérisé en ce que la surface d'appui (39) de chaque dent de scie est située dans le plan de la découpe de boîte pliante (2) lorsque le sommet (42) du profil (19) se trouve sur l'axe (16) d'une courroie de pliage (13) le plus éloigné par rapport à la direction de transport de la découpe de boîte pliante (2).
7. Dispositif selon la revendication 5, caractérisé en ce que les deux axes (17, 18, 21, 22) autour desquels circule la courroie de pliage (13, 14) forment entre eux un angle supérieur à 90° tel qu'un panneau de côté (28, 29) est plié à 180° autour de la ligne de pliage (31) à l'aide d'une courroie de pliage (13, 14) seulement.
8. Dispositif selon la revendication 5, caractérisé en ce que les deux axes (17, 18, 21, 22) d'une courroie de pliage (13, 14) forment entre eux un angle de 90° environ et en ce que chaque panneau de côté (28, 29) est plié à 180° autour de la ligne de pliage (31) à partir de la position initiale au moyen de deux courroies de pliage (13, 14) disposées l'une derrière l'autre dans la direction de transport.
9. Dispositif selon la revendication 1, caractérisé en ce que les axes (17, 18, 21, 22) sont parallèles entre eux et en ce que la surface d'appui (39) est formée de deux surfaces d'appui partielles (44, 45) qui se raccordent sur la face arrière (48) de la courroie de pliage (13, 14) en formant une arête (46) qui s'étend dans la direction longitudinale de la courroie de pliage (13, 14), en ce que, le sommet (42) du profil (19) se trouvant sur un axe (16), l'une des surfaces d'appui partielles (44) est située dans le plan de la position de départ du panneau de côté (28, 29) lorsque la découpe se trouve au-dessus de l'axe (16) et en ce que l'autre surface d'appui partielle (45) est située dans le plan de la position finale du panneau de côté (28, 29) lorsque la découpe de boîte pliante (2) arrive sur l'autre axe (17) autour duquel tourne la courroie de pliage (13, 14).
10. Dispositif selon la revendication 9, caractérisé en ce qu'au moins deux courroies de pliage (13, 14) sont disposées l'une derrière l'autre de chaque côté du dispositif (1) dans la direction de transport des découpes de boîte pliante (2).
11. Dispositif selon la revendication 1, caractérisé en ce que l'une au moins des courroies de pliage (13, 14) est une courroie plate (49) qui porte sur sa face arrière (48) au moins une barrette (53, 54) en matériau souple placée sur chant, dont le petit côté libre, opposé à la courroie de pliage, forme la surface d'appui (39).
12. Dispositif selon la revendication 11, caractérisé en ce que les barrettes (53, 54) forment des ondes ou des méandres dans la direction longitudinale de la courroie de pliage (13, 14).
13. Dispositif selon la revendication 12, caractérisé en ce que la courroie de pliage (13, 14) porte sur sa face arrière (48) deux barrettes (53, 54) formant des ondes qui occupent chacune la moitié de la face arrière (48) et en ce que les barrettes (53, 54) sont en contact mutuel par leurs indentations en forme d'ondes (55, 56) convexes en direction du milieu de la courroie de pliage (13, 14) concernée.
14. Dispositif selon la revendication 1, caractérisé en ce que l'une au moins des courroies de pliage (13, 14) est une courroie plate (49) qui porte sur sa face arrière (48) le profil (19) formé d'un matériau élastique.
15. Dispositif selon la revendication 11 ou 14, caractérisé en ce que la courroie plate est une courroie crantée (49).
EP90103384A 1989-03-18 1990-02-22 Machine à plier Expired - Lifetime EP0388649B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3908981A DE3908981A1 (de) 1989-03-18 1989-03-18 Faltmaschine
DE3908981 1989-03-18

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EP0388649A1 EP0388649A1 (fr) 1990-09-26
EP0388649B1 true EP0388649B1 (fr) 1992-01-22

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EP90103384A Expired - Lifetime EP0388649B1 (fr) 1989-03-18 1990-02-22 Machine à plier

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EP (1) EP0388649B1 (fr)
AT (1) ATE71878T1 (fr)
DE (2) DE3908981A1 (fr)
DK (1) DK0388649T3 (fr)
ES (1) ES2028482T3 (fr)
GR (1) GR3003649T3 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4028635C1 (fr) * 1990-09-08 1991-12-12 Wilhelm Bahmueller, Maschinenbau Praezisionswerkzeuge Gmbh, 7067 Pluederhausen, De
SE503478C2 (sv) * 1994-02-04 1996-06-24 Sund Emba Ab Anordning för att vika förpackningsämnen med hjälp av transportörer försedda med tryckorgan
DE4439198A1 (de) * 1994-11-06 1996-05-09 Klett Alfred Vorrichtung zur Bearbeitung eines entlang eines Förderwegs mit vorgegebener Fördergeschwindigkeit geförderten Zuschnitts
DE10241448A1 (de) * 2002-09-06 2004-03-18 Bahmüller Maschinenbau und Präzisionswerkzeug GmbH Faltmaschine mit erhöhtem Durchsatz
JP4671742B2 (ja) * 2005-04-14 2011-04-20 ニッタ株式会社 平ベルト
CN102673017A (zh) * 2011-03-07 2012-09-19 上海艾录纸包装有限公司 制袋内膜防摩擦成型机构的装置
CN104528066B (zh) * 2014-12-31 2016-08-24 云南云派包装有限公司 一种手提纸箱垫板的自动折叠装置
DE102015219238A1 (de) 2015-10-06 2017-04-06 Wilhelm B a h m ü l l e r Maschinenbau Präzisionswerkzeuge GmbH Faltriemen für eine Vorrichtung zum Falten von Faltschachtelzuschnitten
CN105835408B (zh) * 2016-05-24 2018-06-12 浙江嘉德欣包装装备有限公司 瓦楞纸扁管内衬成型机
CN105835407B (zh) * 2016-05-24 2018-07-27 浙江嘉德欣包装装备有限公司 瓦楞纸扁管内衬导向成型结构
CN108656624A (zh) * 2018-02-14 2018-10-16 温州高晟机械有限公司 一种型腔单元及其构成的型腔成型装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3122070A (en) * 1962-03-08 1964-02-25 Ex Cell O Corp Method and apparatus for side seaming carton blanks by application of heat
DE2911969A1 (de) * 1979-03-27 1980-10-16 Bahmueller Masch W Verfahren und vorrichtung zum falten von faltschachtelzuschnitten, insbesondere aus schwerer wellpappe
FR2520665B1 (fr) * 1982-02-04 1987-12-24 Martin Sa Machine de pliage de plaques

Also Published As

Publication number Publication date
GR3003649T3 (fr) 1993-03-16
ES2028482T3 (es) 1992-07-01
ATE71878T1 (de) 1992-02-15
DE59000034D1 (de) 1992-03-05
DE3908981C2 (fr) 1991-01-31
DK0388649T3 (da) 1992-03-23
DE3908981A1 (de) 1990-09-27
EP0388649A1 (fr) 1990-09-26

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