EP2196278B1 - System zur Markierung von Gipsplattenpackungen - Google Patents

System zur Markierung von Gipsplattenpackungen Download PDF

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Publication number
EP2196278B1
EP2196278B1 EP09179005A EP09179005A EP2196278B1 EP 2196278 B1 EP2196278 B1 EP 2196278B1 EP 09179005 A EP09179005 A EP 09179005A EP 09179005 A EP09179005 A EP 09179005A EP 2196278 B1 EP2196278 B1 EP 2196278B1
Authority
EP
European Patent Office
Prior art keywords
slabs
laser
pack
marking
shielding
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
Application number
EP09179005A
Other languages
English (en)
French (fr)
Other versions
EP2196278A1 (de
Inventor
Paride Ridolfi
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.)
Saint Gobain Italia SpA
Original Assignee
Saint Gobain PPC Italia SpA
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 Saint Gobain PPC Italia SpA filed Critical Saint Gobain PPC Italia SpA
Publication of EP2196278A1 publication Critical patent/EP2196278A1/de
Application granted granted Critical
Publication of EP2196278B1 publication Critical patent/EP2196278B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/262—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used recording or marking of inorganic surfaces or materials, e.g. glass, metal, or ceramics

Definitions

  • the present invention refers to an innovative system for marking slab packs, in particular plasterboard slab packs or coated gypsum slab packs.
  • inks are normally used, that are applied, for example, with a pad suitably pressed against the side of the pack.
  • WO-A-02/094570 discloses ink marking obtained by a print head. Such a technique, however, has been found to be unsatisfactory for a series of reasons. The cost of the marking is quite high. A considerable amount of ink is used, also due to the size of the marking. It is also necessary to frequently refill the pads with new ink, thus slowing down the marking process.
  • ink often leaves wipes onto the product, and can even infiltrate between the gaps normally present between the successive adjacent slabs of the pack.
  • Laser techniques are also known for marking products, such as bottles or the like (see for example US 6,603,136 . These techniques however, have never been able to be used for marking slab packs of plasterboard. These systems of laser imprinting indeed foresee low power levels, not suitable for imprinting large markings like those necessary for the discussed products. Moreover, the relative systems for focusing the laser normally use optical type sensors, or similar, that have difficulty in reliably detecting the position of a slabs pack, in which there are more or less wide gaps between the different adjacent slabs.
  • DE-A-10340375 discloses a high-power laser head for coated gypsum slabs. However, this device is used to cut and/or mark the top, smooth and regular surface of a single slab.
  • the general purpose of the present invention is that of avoiding the aforementioned drawbacks by providing a system for marking slab packs of plasterboard which is fast and cost-effective.
  • a further purpose of the invention is to provide a marking system which makes it possible to obtain high quality writings or logos, with well defined outlines.
  • a further purpose of the invention is to provide a marking system which makes it possible to carry out the marking with maximum safety for the users of the system.
  • a system 11 for marking comprising conveying means 13 of slab packs of plasterboard 14 and a laser device 12.
  • the slabs pack 14 is formed by a vertical pile of slabs 24, to be marked on the side edge.
  • the conveying means 13 can comprise, for example, a series of transport rollers adapted to make the slab packs move in sequence along a set path.
  • the laser device 12 is arranged laterally with respect to the conveying path of the packs and comprises a laser head 15 provided with a laser output 30 from which the laser ray for marking comes out.
  • the laser head 15 is of the type adapted to form a focused laser beam and comprises a suitable lens at the output 30.
  • the laser head is of the class IV type, so as to have enough power to make a marking having a certain size over a reasonably short time.
  • the laser device 12 is moveable between an idle position retracted from the conveying path of the packs ( fig. 2 ), and an advanced operative position to carry out the marking ( fig. 4 ).
  • the movement of the device 12 occurs under the action of an actuator 20, 22 provided with a worm screw, schematically represented in the figures. It should be understood that even another type of actuator can be used instead of the worm screw actuator.
  • the marking device 12 comprises a support 21 on which the laser head 15 is mounted and that is moveable under the action of the actuator 20, 22.
  • the laser device 12 also comprises a box-shaped shielding 16 which encloses the laser output 30 of the laser head 15, and comprises a front opening 50 intended to be closed by the lateral wall of the slabs pack 14.
  • the laser beam carries out the marking on the area covered by the shielding.
  • the shielding 16 is laser opaque and has the function of avoiding that the laser reflects outside the marking area, with possible damage to things or people.
  • the shielding 16 is made from Plexiglas.
  • the shielding is mounted on the support 21 so as to be moveable with respect to the laser head 15 in the movement direction of the head itself.
  • the shielding 16 is slidingly mounted along four rods 26 integral with the support 21 and arranged at the vertices of a rectangle.
  • the shielding 16 is pushed by a spring 27 towards an end-stop position located out in front, as shown in figures 1 and 2 .
  • the shielding 16 is mounted onto the rods 26 with clearances which allow the opening of the shielding to be oriented parallel to the wall 51 of the pack 14 to be marked, even when this is not perfectly perpendicular to the axis of the rods 26 and of the worm screw 22.
  • the laser device 12 also comprises presence sensor means 17 of the slabs pack in front of the laser head 15.
  • the sensor means 17 are configured so as to ascertain whether the pack 14 has actually closed the front opening 50 of the shielding, to ensure the maximum safety in use of the system.
  • the presence sensor means of the pack comprise at least three switches 17, which are not aligned, arranged in proximity of the edge of the opening 50, adapted to detect a contact with the lateral wall of the pack 14.
  • the electromechanical switches 17 are connected in series, so that it is sufficient for one of these to not be pressed to detect an incorrect positioning of the pack with respect to the shielding.
  • the laser device also comprises sensor means adapted to detect when the focal distance between the laser output 30 and the lateral wall 51 of the pack to be marked has been reached.
  • the focal distance sensor means comprise a sensor 18 adapted to detect a set movement of the shielding 16 with respect to the laser head 15, which corresponds to a desired distance of the laser output 30 from the wall 51 of the pack.
  • the sensor 18 is formed with a reference end-stop, supported by an arm 25 integral with the support 21, as clearly shown in figure 1 . It should be understood that the sensor 18 could alternatively detect a movement of another feeler element moveable with respect to the laser head, different from the shielding 16.
  • the system also comprises control means 23 (schematically represented in figure 2 ), connected to the sensor means 17 and 18 adapted to control the actuation of the actuator 20 and of the laser head 15.
  • control means 23 are such as to actuate the laser marking only when they detect contact through all the presence sensors 17 and they detect a correct focal distance of the pack 14 through the sensor 18.
  • Figure 2 shows the laser device 15 in the idle position retracted from the conveying path of the slab packs, with a slabs pack 14 which is brought in front of the laser head.
  • the control means 23 then control the actuation of the actuator 20, which pushes the laser device 12 forwards.
  • the laser head 15 and the shielding 16 integrally advance until the position of figure 3 is reached, in which the switches 17 come into contact with the lateral wall 51 of the pack 14.
  • the control means 23 then control a further advancement of the laser device 12.
  • the shielding 16 rests against the slabs pack and does not advance, so that the laser head 15 runs inside the shielding until the position of figure 4 is reached, in which the laser output 30 is at the focal distance d from the wall 51 of the slabs pack to be marked.
  • the correct position of the laser head is detected through the sensor 18. In this condition the marking is carried out, after which the laser device 12 is again retracted towards the idle position, ready for marking the subsequent slabs pack.
  • the marking is carried out cost-effectively and quickly, thanks to the use of a class IV laser. It is indeed not necessary to use expensive marking inks.
  • the system also allows a high level of safety to be obtained for the users.
  • the particular structure with mobile shielding with respect to the laser head allows an indication of the correct focal distance of the wall to be marked, to be reliably obtained, without requiring complex sensor systems.
  • the system has a simple structure and does not need a lot of maintenance.

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Cultivation Of Plants (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Protection Of Plants (AREA)
  • Laser Beam Processing (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)
  • Wrapping Of Specific Fragile Articles (AREA)
  • Conveying And Assembling Of Building Elements In Situ (AREA)

Claims (10)

  1. System zur Markierung von Gipsplattenpackungen umfassend Markiermittel zur Markierung von Gipsplattenpackungen (14) an den seitlichen Kanten der einzelnen Platte (24) und Fördermittel (13), die dazu geeignet sind, die Gipsplattenpackungen (14) zu den Markiermitteln zu bewegen, dadurch gekennzeichnet, dass die Markiermittel eine Laservorrichtung (12) umfassen, die mit einem Laserkopf (15) der Klasse IV ausgestattet ist, der dazu geeignet ist, eine Markierung auf die Gipsplattenpackung (14) mittels Laser einzugravieren, wobei die Laservorrichtung (12) beweglich ist zwischen einer losen, von einer Bahn von Gipsplattenpackungen (14) zurückgezogenen Stellung und einer zur Bahn hin vorgeschobenen Arbeitsstellung zum Eingravieren der Markierung auf der Gipsplattenpackung (14), wobei das System ferner Präsenzsensorenmittel (17) umfasst, die dazu geeignet sind, die Präsenz einer Gipsplattenpackung (14) vor dem Laserkopf (15) durch Erfassen eines Kontakts mit einer Seite (51) der Gipsplattenpackung (14) festzustellen, die durch die Seitenkanten der einzelnen Platte (24) definiert wird.
  2. System nach Anspruch 1, dadurch gekennzeichnet, dass der Laserkopf (15) einen Laserauslass (30) zur Laseremittierung aufweist, wobei die Laservorrichtung (12) mit einer laserstrahlenundurchlässigen, kastenförmigen Abschirmung (16) versehen ist, die den Laserauslass (30) enthält und mit einer Öffnung (50) versehen ist, die in der Arbeitsstellung der Laservorrichtung durch die Seite (51) einer Gipsplattenpackung (14) geschlossen werden sollte, die durch die Seitenkanten der einzelnen Platten definiert wird.
  3. System nach Anspruch 2, dadurch gekennzeichnet, dass die Präsenzsensormittel (17) so angeordnet sind, dass eine Positionierung der Gipsplattenpackung (14), in der die Öffnung (50) der Abschirmung (16) durch die Seite (51) der Gipsplattenpackung geschlossen ist, erfasst wird.
  4. System nach Anspruch 1, dadurch gekennzeichnet, dass zum Erfassen des Kontakts mit der Seite (51) der Gipsplattenpackung (14) die Präsenzsensormittel (17) mindestens drei nicht ausgerichtete Schalter umfassen.
  5. System nach Anspruch 2, dadurch gekennzeichnet, dass die Präsenzsensormittel (17) Schalter umfassen, die in der Nähe der Kante der Öffnung (50) der Abschirmung (16) angeordnet und fest in die Abschirmung eingebaut sind.
  6. System nach Anspruch 1, dadurch gekennzeichnet, dass es Brennweitensensormittel (18) zum Abtasten der Brennweite zwischen einem Ausgang (30) des vom Laserkopf (15) erzeugten Laserstrahls und der Seite (51) der zu markierenden Gipsplattenpackung (14) umfasst.
  7. System nach Anspruch 6, dadurch gekennzeichnet, dass die Brennweitensensormittel (18) einen Sensor zum Erfassen einer voreingestellten Bewegung eines Tasters bezogen auf den Laserkopf (15) umfassen, wobei der Taster dazu geeignet ist, die Seite (51) der Gipsplattenpackung während der Bewegung der Laservorrichtung von der Ruhestellung in die Arbeitsstellung zu berühren.
  8. System nach den Ansprüchen 2 und 7, dadurch gekennzeichnet, dass der Taster die laserundurchlässige Abschirmung (16) der Laservorrichtung (12) ist.
  9. System nach Anspruch 6, dadurch gekennzeichnet, dass es Kontrollmittel (23) umfasst, die mit den Präsenzsensormitteln (17) und den Brennweitensensormitteln (18) verbunden und dazu geeignet sind, die Emission eines Laserstrahls nur dann zu betätigen, wenn eine angemessene Positionierung der Gipsplattenpackung (14) bezogen auf den Laserkopf (15) festgestellt wurde.
  10. System nach Anspruch 1, dadurch gekennzeichnet, dass der Laserkopf (15) transversal bezogen auf die Förderrichtung der Gipsplattenpackung (14) beweglich ist, um die durch die Seitenkanten der einzelnen Platten definierte Seite (51) einer Packung zu markieren.
EP09179005A 2008-12-15 2009-12-14 System zur Markierung von Gipsplattenpackungen Not-in-force EP2196278B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITMI2008A002223A IT1392198B1 (it) 2008-12-15 2008-12-15 Impianto per la marchiatura di pacchi di lastre di cartongesso

Publications (2)

Publication Number Publication Date
EP2196278A1 EP2196278A1 (de) 2010-06-16
EP2196278B1 true EP2196278B1 (de) 2012-03-21

Family

ID=40835523

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09179005A Not-in-force EP2196278B1 (de) 2008-12-15 2009-12-14 System zur Markierung von Gipsplattenpackungen

Country Status (3)

Country Link
EP (1) EP2196278B1 (de)
AT (1) ATE550130T1 (de)
IT (1) IT1392198B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015168728A1 (en) * 2014-05-09 2015-11-12 Csr Building Products Limited Stack printing

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2997069C (en) 2018-03-02 2020-04-28 Signode Packaging Group Canada ULC Lumber stack marking machine and methods of applying markings to lumber stacks

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6603136B1 (en) * 1999-10-15 2003-08-05 Videojet Systems International Laser marker focal length setting device
FI20011064A7 (fi) * 2001-05-21 2002-11-22 Metso Paper Inc Menetelmä ja laitteisto kappaleiden, esimerkiksi levyjen, merkitsemiseksi pinossa
DE10340375A1 (de) * 2003-08-30 2005-04-21 Schweistechnische Und Bildungs Verfahren zum Schneiden von Gipskartonplatten

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015168728A1 (en) * 2014-05-09 2015-11-12 Csr Building Products Limited Stack printing

Also Published As

Publication number Publication date
IT1392198B1 (it) 2012-02-22
ATE550130T1 (de) 2012-04-15
ITMI20082223A1 (it) 2010-06-16
EP2196278A1 (de) 2010-06-16

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