EP3930992A2 - Machine de pliage de découpes de boites pliantes et procédé de détection en temps réel de rainures et/ou de fentes d'une découpe de boites pliantes - Google Patents

Machine de pliage de découpes de boites pliantes et procédé de détection en temps réel de rainures et/ou de fentes d'une découpe de boites pliantes

Info

Publication number
EP3930992A2
EP3930992A2 EP20705954.4A EP20705954A EP3930992A2 EP 3930992 A2 EP3930992 A2 EP 3930992A2 EP 20705954 A EP20705954 A EP 20705954A EP 3930992 A2 EP3930992 A2 EP 3930992A2
Authority
EP
European Patent Office
Prior art keywords
folding
folding box
gap
grooves
box blanks
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.)
Pending
Application number
EP20705954.4A
Other languages
German (de)
English (en)
Inventor
Thomas Stober
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 EP3930992A2 publication Critical patent/EP3930992A2/fr
Pending legal-status Critical Current

Links

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
    • B31B50/006—Controlling; Regulating; Measuring; Improving safety
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
    • G01B11/022—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness by means of tv-camera scanning
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
    • G01B11/04—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness specially adapted for measuring length or width of objects while moving
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
    • 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
    • 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
    • B31B2110/00—Shape of rigid or semi-rigid containers
    • B31B2110/30—Shape of rigid or semi-rigid containers having a polygonal cross section
    • B31B2110/35—Shape of rigid or semi-rigid containers having a polygonal cross section rectangular, e.g. square
    • 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
    • B31B2120/302—Construction of rigid or semi-rigid containers collapsible; temporarily collapsed during manufacturing collapsible into a flat condition
    • 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
    • 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
    • B31B50/624—Applying glue on blanks
    • 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
    • B31B50/74—Auxiliary operations
    • B31B50/92—Delivering
    • B31B50/98—Delivering in stacks or bundles
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
    • G01N2021/8909—Scan signal processing specially adapted for inspection of running sheets
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
    • G01N21/8914—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles characterised by the material examined

Definitions

  • folding box blanks are creased, folded and then in the area of a
  • Folding shaft blanks are later set up by the customer and unfolded so that cardboard boxes are created.
  • Folding box blanks do not run parallel to one another in the area of the adhesive edge.
  • the gaps in the extension of the adhesive edge are therefore not rectangular, but have the shape of a trapezoid or a triangle (so-called fishtailing). This is illustrated in fishtailing in FIG. 1 of US 2017/0348940 A1 and is also explained there in connection with FIG. To explain this term, reference is therefore made to the cited publication.
  • the gap located in front of the adhesive edge in the transport direction is referred to in connection with the invention as the "lead" gap.
  • the gap located on the adhesive edge is called the "trail" gap
  • the lead gap and the trail gap are exactly the same size and the edges of both gaps run parallel to one another.
  • Folding box blanks are not good enough and must therefore be classified as "bad” and rejected.
  • a poor folding box blank can, if it is to be set up and filled at the customer's, become a Operational disruption or interruption of about 15 minutes. This is not acceptable and must therefore be avoided at all costs.
  • a poor folding box blank usually results in a box that is not dimensionally accurate. This non-dimensionally stable carton cannot be filled correctly, which causes considerable problems and a considerable loss of time.
  • the aim is therefore to bundle only good folding box blanks into a package and in any case to prevent bad ones, especially those that are not dimensionally accurate
  • Folding box blanks are delivered to the customer.
  • EP 0937573 A1 or DE 699 15 399 B2 based on it, describes a method and a device for checking the precision of the folding of a cuboid box and the use of such a device.
  • the lead gap and the trail gap are recorded with the aid of a light source and a camera.
  • the camera in turn is connected to image processing software which enables the location of the gap to be recognized and the
  • This system should be able to detect bad / faulty folding box blanks or folding box blanks whose slots do not comply with a standard that is not defined in more detail, and those that do not comply with the standard
  • a device and a method for checking folded and glued folding box blanks are known from US 2017/0348940 A1.
  • a stack of folding box blanks placed on top of one another, which have already been folded and glued, is checked for dimensional accuracy.
  • the disadvantage of this method is that the finished folding box blank is only when it is in a stack with several other folding box blanks.
  • the invention is based on the object of providing a device and a method which the disadvantages of Avoids prior art.
  • Folding box blanks are ejected, so that the productivity of the folding machine and all upstream and downstream
  • this object is achieved in a folding machine for folding box blanks, comprising at least one
  • Control device means for conveying the
  • Folding box blanks and an alignment unit for folded folding box blanks achieved in that the folding machine has at least one device for the optical detection of grooves and / or gaps in the
  • Folding box blanks that a device for the optical detection of grooves in a transport direction of the folding box blanks through the folding machine in front of the Means for folding the folding box blanks is arranged, and / or that a device for optically detecting gaps in the transport direction after the means for folding the folding box blanks and before the
  • Alignment unit are arranged.
  • Folding box blank can be classified as "bad” and it is ejected. This means that for
  • a folding box blank with defective grooves is ejected at the earliest possible point in time, so that further production is only continued with "good" folding box blanks and a reduced reject rate.
  • Folding box blanks arranged so that at least the lead gap and the trail gap are recorded in the area of an adhesive edge and the recorded measured values are evaluated can.
  • a folding box blank classified as "bad” can be ejected from the production process immediately afterwards through an ejection station, so that further production can only take place with good
  • Bundles are tied, resulting problems are minimized or even avoided completely.
  • Strapping machine from which a package is bundled. These bundles of one hundred folding box blanks are delivered to the end customer.
  • the folding box is cut manually and in many cases causes a time delay of around 8 minutes.
  • the folding box blank can be replaced with a good one and the bundle tied again. It is obvious that the resulting effort is considerable and that trouble-free production is hardly possible in this way.
  • Folding box blank recorded over their entire length. A large number of data (measured values) is recorded for each lead gap and for each trail gap. From this multitude of data, which represent the course of the lead gap and the trail gap,
  • a prediction value is determined which provides information on whether the folding box blank at the end of the production process will be within or outside the specified dimensional tolerances. If the evaluation shows that the
  • Folding box blank is ejected and production is continued without this folding box blank.
  • Enabling folding box blanks includes the
  • Folding machine at least one station for discharging individual folding box blanks. This station is preferred after the device according to the invention for the optical detection of grooves and a device for the optical detection of gaps in the
  • the station is in the direction of transport
  • Folding box blanks are arranged as far forward as possible in the folding machine, so that folding box blanks identified as faulty can be ejected at the earliest possible point in time.
  • the discharge station it is also possible to provide a station for marking individual folding box blanks.
  • the folding box blanks classified as bad can then be marked and removed from the process manually or by a gripper or other device at a later time.
  • the devices according to the invention for the optical detection of grooves and / or gaps can use any suitable technology known from the prior art.
  • these devices can be a Be a matrix camera, a line camera or a laser distance sensor. If in a preferred embodiment the
  • Laser distance sensors work on the principle of triangulation or the principle of time of flight. Both
  • Modes of operation are suitable both for recording the shape, contour and position of grooves, as well as for recording the
  • the object mentioned at the beginning is also achieved by a method for online monitoring of grooves in one
  • Process steps include:
  • This process can also be carried out fully automatically with the aid of a closed control loop and without the intervention of the machine operator
  • the object mentioned at the beginning is also achieved by a method for monitoring gaps in real time in a folding machine according to one of the preceding
  • Process steps include:
  • Geometry data of the lead gap and the trail gap a prediction is determined as to whether the folding box blank will be "good” or “bad” after it has been aligned in the alignment unit.
  • Dimensional accuracy can be determined for each box.
  • a prediction value for the lead gap and a prediction value for the trail gap are determined.
  • the predictions can be made in a wide variety of ways. For example, the mean value of all the measured widths of the lead gap and the trail gap can be formed and one or more prediction values for the expected dimensional accuracy of the carton can be formed therefrom. For example, only every hundredth measured value can be used to determine a prediction value
  • the invention is not restricted to a specific method or a specific calculation rule for determining the predicted value. Rather, one will always strive to ensure that the
  • Control unit emits a visual and / or acoustic signal when a folding box blank is classified as "bad"
  • FIG. 1 shows an unfolded folding box blank with gaps and grooves
  • FIG. 2 shows the folding box blank according to FIG. 1 folded and glued in the area of the adhesive edge
  • FIG. 3 shows a diagram of a folding machine according to the invention or the flow chart of a method according to the invention
  • Figure 4 is a measured section through a
  • Figure 5 is a measured section through a
  • Figure 6 shows a measured section through a
  • FIG. 7 measured values from the detection of a gap and the line edges of the gap calculated therefrom
  • FIG. 9 the comparison of measured gap widths and the predicted value of calculated gap widths. Description of the exemplary embodiments
  • Figure 1 shows the top view of a
  • Folding box blank 1 with gaps and grooves and an adhesive edge.
  • the folding box blank 1 is moved in the direction of arrow 3 by a folding machine according to the invention.
  • the direction of arrow 3 corresponds to
  • Folding box blank one front edge 5 and one
  • Trailing edge 7 In the Anglo-American language area, the leading edge is called the "Lead” edge and the trailing edge 7 is called the
  • the gap 9 present at the front edge 5 is referred to as the lead gap and the gap 11 present in the region of the rear edge 7 is referred to as the trail gap.
  • grooves 15.1 to 15.3 running in the direction of transport are embossed in the folding box blank 1. These grooves 15 are indicated by dot-dash lines. They each connect a lead gap 9 with a trail gap 11.
  • the grooves 17 delimit the flaps (without
  • Form folding box blank 1 formed cardboard boxes.
  • a side edge 19 is present on the left-hand side of the folding box blank 1 in FIG.
  • On the right in Figure 1 of the folding box blank 1 is a
  • Adhesive edge 13 formed.
  • the "right" side edge 21 consists of sections 21.1 and 21.2.
  • FIG. 2 the folding box blank 1 from FIG. 1 is shown in the folded and glued state, likewise in a view from above.
  • the transition from the flat folding box blank 1 according to Figure 1 to the folded and glued folding box blank according to Figure 2 takes place in a folding machine in that the folding box blank 1 is folded or turned over by 180 ° along the grooves 15.1 and 15.3, as shown in FIG the right part of the folding box blank 1 with the adhesive edge 13 turned over first.
  • the left-hand part of the folding box blank 1 was then folded over with the side edge 19 along the groove 15.1, so that the middle section 19.3 of the side edge 19 comes to rest on the adhesive edge 13.
  • the sides of the folding box blank 1 are glued.
  • the gluing can be done, for example, by applying glue to the middle section 19.3 of the folding box blank 1 or to the adhesive edge 13 before the left end of the folding box blank 1 is on the Adhesive edge 13 of the folding box blank 1 rests and is pressed there.
  • a trail gap 11 In FIG. 2, the lead gap 9 and the trail gap 11 are perfectly shaped. This means that the edges 19.1 and 21.1 run parallel to one another. The same applies to the edges 19.2. and 21.2 of the trail gap 11.
  • a width B of the lead gap 9 and the trail gap 11 on the top of the folding box blank 1 is equal to the width of the lead gap 9 and the trail gap 11 on the bottom of the folding box blank in of Figure 2.
  • FIG. 2 a "perfectly" folded and glued folding box blank 1 is shown. That is perfect
  • Folding box blank 1 are positioned. Another cause can be that the folding box blank does not bend exactly along the grooves 15.1 and 15.3 when it is folded. This can be the case when the folding box blank 1 is made from corrugated cardboard and the corrugations of the corrugated cardboard do not run exactly parallel to the grooves 15.1 or 15.3.
  • Corrugated cardboard can cause the
  • Fishtailing is the effect that the edges of the lead gap and trail gap are not parallel and the width of the lead gap and trail gap are not the same.
  • the folding box blank fulfills the requirements placed on it
  • FIG. 3 shows the method according to the invention or an embodiment of the method according to the invention in the form of a flowchart.
  • Process step includes a device, so that Figure 3 is also a schematic representation of the
  • a control unit is not shown.
  • the control unit communicates with the devices 21 to 39 by calling up data and / or activating the devices.
  • Folding machine begins in FIG. 3 at the top left and ends at the bottom right (see arrows 3). For reasons of clarity, transport devices that transport the folding box blanks (not shown) through the folding machine or transport them from one device to the next are not shown. As transport facilities, all of the
  • the first block 21 represents a device for
  • At least one groove 15.1, 15.2 and / or 15.3 is detected in a block 23 with a device for optical detection.
  • the block 23 represents a device for the optical detection of Grooves or the process step "optical detection of at least one groove”.
  • the reference numeral 25 thus stands for an adhesive device or the
  • a block 27 represents a first discharge station or the method step “discharge of a defective folding box blank”.
  • the first diverting station 27 is activated when a folding box blank has been recognized as lying outside of the tolerances or "bad" in the device 23 for the optical detection of grooves.
  • Outward transfer station 27 to arrange a device for marking a faulty folding box blank, for example by means of an imprint or another feature. These marked folding box blanks can then be easily recognized at the end of the folding machine and by the others
  • Reference numeral 29 thus stands for a device for Folding or the process step "folding a folding box blank". At the end of the folding process, the adhesive edge 13 and the section 19.3 of the edge 19 of the folding box blank 1 are glued together. However, the adhesive connection is not immediately final.
  • Folding box blank was recognized as faulty or poor, in particular because the width B of the lead gap 9 and / or the trail gap 11 existing there in the area of the adhesive edge 13 lies outside the specified reference values or the fishtailing is too strong, this folding box blank can be in a second
  • Removal station 33 can be removed.
  • 20 or 50 folding box blanks are aligned in an alignment unit 37.
  • an alignment unit 37 For example, 20 or 50 folding box blanks are aligned.
  • Alignment unit 37 are slides or other movable stops against the stack from all sides
  • Folding box blanks is significantly reduced.
  • the stacked and aligned folding box blanks then arrive at a device 39 for
  • Bundle up i.e. a strap is wrapped around the stack.
  • This strapping band is automatically welded or closed in some other way, so that a bundle of 50 or 20
  • Folding box blanks are created in the manner of a cuboid.
  • Reject station 27 are swapped in the order. It is also possible to use the first reject station 27
  • the removal station namely the second removal station 33, is to be provided. Then the folding box blanks with defective grooves 15, which were recognized by the device 23 for the optical detection of grooves, and
  • Removal station namely the second removal station 33, removed from the production process.
  • Reference number 21 can be checked by a device 23 for optical detection.
  • the device 39 for bundling folding box blanks reaches almost 100%
  • the devices 23 and 31 for the optical detection of grooves and / or gaps can use the same hardware
  • the devices 23, 31 shown in FIG. 12 first detect a lead gap 9, then a groove 15 and then a trail gap 11.
  • the devices 23, 31 shown in FIG. 12 first detect a lead gap 9, then a groove 15 and then a trail gap 11.
  • Devices 23, 31 suitable for the optical detection of grooves and / or gaps.
  • Laser distance sensors are particularly advantageous since these laser distance sensors can be used to record the contour of the grooves and also gaps 9 and 11 very well and with high precision.
  • FIG. 4 the measurement result of a laser distance sensor in the area of a gap 9 or 11 is shown as an example.
  • a thickness of the corrugated board is indicated by D. Where the gap 9, 11 is present, the thickness of the folding box blank is zero.
  • a width of the gap 9, 11 is indicated by B.
  • the position of the gap 9, 11 can be specified, for example, by the position of the two flanks of the gap 9, 11.
  • a section through a gap 9, 11 is shown as an example; it represents, so to speak, a snapshot at a specific location of the gap 9, 11.
  • a large number of measurements are carried out while the folding box blank 1 (see FIG. 1) moved through in the transport direction 3 under a device 31 for the optical detection of gaps.
  • such devices 31 are in the extension of the column 9, 11 and the grooves 15.1, 15.2 and 15.3
  • Device 31 first of all the lead gap 9 with the aid of several measured values.
  • the grooves 15.1, 15.3 then move under the device 31.
  • the device operates as a device 23 for optically detecting grooves.
  • 15 to 20 measured values are recorded per gap. With long columns, more than 30 measured values can be recorded.
  • the groove 15.1 is shown as a depression with a width B and a depth T.
  • Width B corresponds approximately to the width of a scoring wheel, with the aid of which the groove 15.1 is impressed or embossed into the folding box blank.
  • a transition area 43 on both sides of the actual groove 15 connects the undisturbed areas of the folding box blank 1 and the groove 15.1 in the manner of an "embankment".
  • Transition areas 43 is the surface of the
  • Position 41, width B and depth T of the groove 15.1 and other grooves 15 can be determined from the values measured by the device 23, as shown in FIG.
  • the course of a groove 15, 1 can be determined by comparing a large number of successive measurements. If a groove runs parallel to the transport direction 3, the value 41, which describes the position of the groove, remains constant. In the case of an inclined groove 15, the value 41 changes.
  • the position of the groove 15.1 is not correct, then the value 41 deviates from the desired target value. The same applies to the depth T, the width B and the contour of the groove 15.
  • FIG. 6 a groove with a crack 45 is shown as an example.
  • This crack 45 presents itself as a local depression in the area of the groove 15. So if such a crack 45 is recognized, then first of all the associated folding box blank can be ejected. In addition, the depth of the groove 15 can be reduced. This is done, for example, by the fact that the associated scoring wheel is not advanced as far. This process can be done manually from
  • the device 23 according to the invention for the optical detection of grooves can thus determine the depth T of the grooves 15 without the risk of significant rejects
  • Folding box blanks 1 can be significantly improved.
  • Alignment unit 37 lies within the required tolerances or outside the required tolerances.
  • Embodiment of the invention provided, from the straight lines 47 measured and determined in the device 31,
  • the folding box blank remains in the production process, even if it is still outside the required tolerances when passing through the device 31.
  • Folding box blank will in all probability also lie outside the tolerances after the alignment unit 37, then the relevant folding box blank is discharged or marked in the second discharge station 33 and removed from the production process at a later point in time.
  • the figure 8 it is made clear how strong the in the device 31 for optical detection of gaps
  • width B of the column or fishtailing determined values (width B of the column or fishtailing) and the values actually present after the alignment unit 37 differ from one another.
  • a line 55 shows the difference between the values 51 and 53.
  • FIG. 9 shows the comparison of the measured gaps after the alignment unit 37 (see line 57) and the comparison with the calculated prediction values (see line 59). Both lines 57 and 59 are nearly
  • the inventive method is able to

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Abstract

L'invention concerne un dispositif et un procédé pour plier des découpes de boîtes pliantes, dans lesquels une détection de rainures et de fentes est effectuée le plus tôt possible dans le processus de production, et si l'une de ces rainures ou fentes se situe en dehors d'une limite de tolérance prédéterminée, celles-ci sont immédiatement éjectées.
EP20705954.4A 2019-03-01 2020-02-17 Machine de pliage de découpes de boites pliantes et procédé de détection en temps réel de rainures et/ou de fentes d'une découpe de boites pliantes Pending EP3930992A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019105217.3A DE102019105217A1 (de) 2019-03-01 2019-03-01 Faltmaschine für Faltschachtelzuschnitte und Verfahren zur Erfassung von Rillen und/oder Spalten eines Faltschachtelzuschnitts in Echtzeit
PCT/EP2020/054120 WO2020178015A2 (fr) 2019-03-01 2020-02-17 Machine de pliage de découpes de boites pliantes et procédé de détection en temps réel de rainures et/ou de fentes d'une découpe de boites pliantes

Publications (1)

Publication Number Publication Date
EP3930992A2 true EP3930992A2 (fr) 2022-01-05

Family

ID=69630315

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20705954.4A Pending EP3930992A2 (fr) 2019-03-01 2020-02-17 Machine de pliage de découpes de boites pliantes et procédé de détection en temps réel de rainures et/ou de fentes d'une découpe de boites pliantes

Country Status (3)

Country Link
EP (1) EP3930992A2 (fr)
DE (1) DE102019105217A1 (fr)
WO (1) WO2020178015A2 (fr)

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