EP3837200A1 - Device for processing flat elements and transport belt for use in a device of this type - Google Patents

Device for processing flat elements and transport belt for use in a device of this type

Info

Publication number
EP3837200A1
EP3837200A1 EP19753033.0A EP19753033A EP3837200A1 EP 3837200 A1 EP3837200 A1 EP 3837200A1 EP 19753033 A EP19753033 A EP 19753033A EP 3837200 A1 EP3837200 A1 EP 3837200A1
Authority
EP
European Patent Office
Prior art keywords
section
conveyor belt
axes
roller
transport
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.)
Granted
Application number
EP19753033.0A
Other languages
German (de)
French (fr)
Other versions
EP3837200C0 (en
EP3837200B1 (en
Inventor
Jörg SCHEFFLER
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.)
SCHEFFLER, JOERG
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP3837200A1 publication Critical patent/EP3837200A1/en
Application granted granted Critical
Publication of EP3837200C0 publication Critical patent/EP3837200C0/en
Publication of EP3837200B1 publication Critical patent/EP3837200B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H5/00—Feeding articles separated from piles; Feeding articles to machines
    • B65H5/22—Feeding articles separated from piles; Feeding articles to machines by air-blast or suction device
    • B65H5/222—Feeding articles separated from piles; Feeding articles to machines by air-blast or suction device by suction devices
    • B65H5/224—Feeding articles separated from piles; Feeding articles to machines by air-blast or suction device by suction devices by suction belts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H43/00—Use of control, checking, or safety devices, e.g. automatic devices comprising an element for sensing a variable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/50—Auxiliary process performed during handling process
    • B65H2301/53—Auxiliary process performed during handling process for acting on performance of handling machine
    • B65H2301/531—Cleaning parts of handling machine
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2401/00—Materials used for the handling apparatus or parts thereof; Properties thereof
    • B65H2401/10—Materials
    • B65H2401/15—Metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2404/00—Parts for transporting or guiding the handled material
    • B65H2404/10—Rollers
    • B65H2404/11—Details of cross-section or profile
    • B65H2404/115—Details of cross-section or profile other
    • B65H2404/1151—Details of cross-section or profile other brush
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2404/00—Parts for transporting or guiding the handled material
    • B65H2404/20—Belts
    • B65H2404/22—Cross section profile
    • B65H2404/222—Flat belt
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2404/00—Parts for transporting or guiding the handled material
    • B65H2404/20—Belts
    • B65H2404/25—Driving or guiding arrangements
    • B65H2404/253—Relative position of driving and idler rollers
    • B65H2404/2532—Arrangement for selectively changing the relative position of the driving and idler rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2404/00—Parts for transporting or guiding the handled material
    • B65H2404/20—Belts
    • B65H2404/27—Belts material used
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2404/00—Parts for transporting or guiding the handled material
    • B65H2404/20—Belts
    • B65H2404/27—Belts material used
    • B65H2404/271—Belts material used felt or wire mesh
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2404/00—Parts for transporting or guiding the handled material
    • B65H2404/20—Belts
    • B65H2404/28—Other properties of belts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2406/00—Means using fluid
    • B65H2406/30—Suction means
    • B65H2406/36—Means for producing, distributing or controlling suction
    • B65H2406/366—Means for producing, distributing or controlling suction producing vacuum
    • B65H2406/3662—Fans
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/10—Size; Dimensions
    • B65H2511/13—Thickness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2801/00—Application field
    • B65H2801/84—Paper-making machines

Definitions

  • the invention relates to a device for processing flat elements according to the preamble of claim 1 and a conveyor belt for use in such a device according to claim 21.
  • suction tapes are usually made of rubber or a similar material and have a plurality of holes.
  • the transport device has at least two rollers, over which this suction belt runs, and below the upper section of the suction belt serving as the transport belt (that is, below the transport section of the transport belt) there is a so-called suction box which can be subjected to negative pressure, the upper side of which has a large number of openings, so that the vacuum acting in the suction box on the one hand sucks the transport section onto the suction box, and on the other hand paper that is on the surface of the transport section sucks onto this surface.
  • the conveyor belt also consists of a metal, but not of a fabric, but of an expanded metal.
  • Expanded metal sheets are industrially produced on a large scale.
  • a metal sheet is passed through rollers, at least one of the rollers having a plurality of teeth which penetrate the metal sheet, thereby producing a regular hole pattern.
  • the holes are often diamond-shaped in a subsequent process step, the expanded metal produced in this way can be calendered, which means that it is pressed through between two rolls arranged on a gap.
  • Components made of expanded metal are used for a wide variety of applications, for example as filters or filter carriers or as cladding elements. Almost all of the purposes mentioned so far have in common that the expanded metal components are used purely statically.
  • endless belts made of expanded metal are outstandingly suitable for the above-mentioned purpose in several respects. They show a very good flatness, i.e. hardly any curvature in the transport area, are very durable and also show good scattering behavior with regard to the emerging laser light, which improves the quality of the products produced. Furthermore, these tapes can be cleaned very well. Particularly suitable types of expanded metal are given in claims 2 to 10.
  • the axes of the two deflection rollers of the conveyor belt are usually in one plane. In order to prevent the conveyor belt from “wandering away” to the side, it is preferred to keep the axis of a deflection roller pivotable within this plane so that the angle! between the axes of the pulleys is changeable. Furthermore, an adjusting device for adjusting this axis is preferably provided, which is further preferably part of a control circuit. As a rule, it is sufficient and also preferred to adjust only the non-driven axis.
  • FIG. 1 shows a highly schematic cross section through a laser cutting device in which a transport device improved according to the invention is used
  • FIG. 2 shows a schematic plan view from the direction R of the transport device shown in FIG. 2 without an input and output roller
  • Figure 3 shows the detail D from Figure 2 (but not to scale), that is, a
  • Figure 4 shows a section along the plane A-A in Figure 3 and
  • Figure 5 shows a preferred embodiment of a cleaning station.
  • FIG. 1 shows a schematic cross-sectional view of a device for generating laser cuts in flat paper blanks such as greeting cards or the like.
  • the laser cutting device consists of four elements, namely borrowed from a feed unit 40, a transport device 10, a laser 30 arranged above the transport device and a discharge unit 50.
  • the transport direction of the paper is the direction T and the device can work continuously, that is to say the cutting contours are produced by the laser with a constant transport movement through the transport device 10.
  • FIG. 2 shows a plan view of the transport device 10 of FIG. 1 from the direction R.
  • the feed unit 40 can be constructed conventionally, namely consisting of a table 42 with a smooth surface and a row of transport rollers 44, which feed the paper blanks over the table to the transport device 10.
  • the transport rollers 44 can be rotated slightly from a 90 degree angle with respect to the transport direction T and press the paper blanks against a stop so that a more precise positioning of the paper blanks is achieved.
  • the removal unit 50 can also be constructed conventionally and can consist, for example, of a connecting piece 52 and a conveyor belt 54. However, it would also be possible, for example, to provide a stacker or the like immediately after the transport device 10.
  • the essential elements of the transport device 10 are two rollers 12a, 12b, wherein at least one of the two rollers, here the roller 12b in the paper flow direction, is driven by a motor 13, the conveyor belt 25 and a plurality of axial fans 16, which are below the upper one Section (ie the respective transport section) 25a of the conveyor belt 25 are arranged.
  • a carrier 14 is located in the horizontal plane, which essentially extends from the front roller 12a to the rear roller 12b.
  • This carrier 14 has a plurality of openings;
  • the axial fans 16 are arranged at the positions of the openings, as is shown only very schematically in FIG.
  • the carrier 14 can also be made substantially thinner.
  • the axial fans 16 are preferably located relatively close to the underside of the upper section 25a of the conveyor belt.
  • the axes 12a 'and 12b' of the rollers lie in one plane and the axis 12b 'of the driven roller 12b preferably extends exactly perpendicular to the transport direction T.
  • the angle of the non-driven axis 12a' can easily be changed to the transport direction within the plane by one to prevent the conveyor belt 25 from “running away” to the side. As a rule, a few tenths of a degree around the neutral position (in which the non-driven 12a 'axis is parallel to the driven axis 12b') are sufficient.
  • an adjusting element 80 which acts on a bearing 15 of the non-driven axis 12a '.
  • This control element can be designed, for example, as a linear motor or as a servo motor.
  • the adjusting element 80 can be designed in such a way that it permits a continuous adjustment of the angle of the axis or only a gradual adjustment thereof.
  • the control element is controlled by a controller 82, which in turn receives information from at least one belt position sensor.
  • a controller 82 which receives information from at least one belt position sensor.
  • there are two belt position sensors namely a right belt position sensor 84 and a left belt position sensor 86.
  • These belt position sensors can be designed, for example, as simple light barriers which emit a signal to the control when the belt edge exceeds a predetermined position to the outside. If the control is notified that the position has been exceeded to the right, it controls the actuating element in such a way that the bearing 15 is moved in direction A, as a result of which the belt moves back towards the center. If the control is notified that the position has been exceeded to the left, it controls the actuating element in such a way that the bearing 15 is moved in the direction B.
  • the conveyor belt 25 is designed as an expanded metal belt, for which purpose the end faces of an expanded metal strip of suitable length and width are connected to one another, in particular by means of plasma or laser welding. Before this connection, the expanded metal strip is preferably calendered.
  • FIG. 3 shows a small section of a suitable expanded metal
  • the perforations of the expanded metal are diamonds of the same type with a first axis A1 and a second axis A2.
  • the axes are preferably of unequal length and the shorter axes (here the first axes A1) point in the transport direction T.
  • the length of the first axes A1 is preferably between 1.5 mm and 4 mm and the length of the second axes between 2.5 mm and 6 mm.
  • the free cross section of the conveyor belt is preferably between 50% and 70%.
  • the thickness of the expanded metal in the region of the “nodes”, which are arranged between four openings in each case, is slightly increased on one side, so that an essentially flat first surface 26a and a second surface 26b with slight increases 26b results.
  • This structure arises automatically with many calendered expanded metals.
  • the end faces of the expanded metal strip are connected to the conveyor belt in such a way that the first surface 26a points inwards and the second surface 26b outwards, so that the transported sheets in the transport section 25a rest exclusively on these elevations 26b '. Among other things, this has advantages in terms of the back reflection of the laser beams.
  • the total thickness d g of the expanded metal is preferably between 0.2 mm and 0.5 mm.
  • the expanded metal is preferably made of stainless steel.
  • the transport device 10 can also have the following elements, for example: input rollers 23, an output roller 20 and a lower cleaning brush 22 or a cleaning station. A preferred embodiment of such a cleaning station will be explained later with reference to FIG. 5.
  • the cutting laser 30 is arranged above the transport device 10.
  • the device is operated continuously and preferably at a constant transport speed.
  • the axial fans 16 which suck air through the upper section 25a of the conveyor belt 25, the paper blanks fed by the feed unit 40 are held in position.
  • the air expelled by the axial fans 16 exits through the lower section 25b of the conveyor belt and thus continues to contribute to cleaning the returning section of the conveyor belt 25.
  • the provision of axial fans has, compared to the provision of a suction box, the further great advantages of a significantly reduced energy requirement and a significantly reduced noise level (in conventional suction boxes, radial compressors are generally used as vacuum generators).
  • the laser 30 cuts the paper blanks lying on the upper section of the conveyor belt, which cuts out of the transport device 10 on the rear roller 12b and are removed via the removal unit 50.
  • each side cheek has a slot which extends in the transport direction and through which the axis of a roller extends, so that the distance between the two rollers 12a, 12b can be changed and thus the conveyor belt 25 is tensioned can.
  • the conveyor belt 25 can also finished, so welded to form an endless loop, where it is pushed laterally onto the rollers 12a, 12b, in this case auxiliary units such as the input rollers 23, etc. may have to be removed.
  • FIG. 5 shows a preferred embodiment of a cleaning station 70, which can be arranged below the returning section 25 of the conveyor belt 25, for example at the location of the cleaning brush 22 mentioned above.
  • This cleaning station 70 has a cleaning roller 71 which can be driven about an axis 73 and a container 76 open at the top for receiving cleaning liquid 77 (in the simplest case water).
  • a stripping roller 78 is also provided, which is driven in the opposite direction to the cleaning roller ze.
  • At least the outer jacket layer of the cleaning roller 71 is designed as a sponge (sponge jacket 74 - FIG. 11) or in the form of a brush (brush jacket 75 - FIG. 12).
  • the cleaning roller 71 is preferably driven in the same direction of rotation as the rollers 12a, 12b.
  • the cleaning roller 71 is positioned so that it presses against the returning section 25b of the conveyor belt 25 from below and dips into the cleaning liquid 77 with a lower part.
  • New cleaning liquid 77 is constantly taken up by the rotation of the cleaning roller and conveyed to the returning section 25b of the conveyor belt.
  • the scraper roller which is arranged in the direction of rotation of the cleaning roller between the cleaning liquid and the conveyor belt, the degree of moistening of the returning portion can be adjusted.
  • the radial distance between cleaning roller and stripping roller 78 is preferably adjustable.
  • wet cleaning has several advantages. First of all, a good cleaning of the conveyor belt from burns, ashes and the like can be achieved. Furthermore, the moistening of the conveyor belt as such also has advantages: On the one hand, evaporation boxes are created - additionally favored by the arrangement of the axial fans - that is, the conveyor belt, the upper section 25a of which is exposed to laser energy, is cooled. Humidification can also be set in this way that a certain amount of liquid also adheres to the upper section 25a of the conveyor belt. This adhering liquid improves the adhesion of burn-up, ash and the like so that they do not contaminate the back of the processed paper. The fabric structure of the metal conveyor belt strongly favors the intended adhesion of liquid.
  • processing device described is suitable not only for processing paper but also for processing other flat elements such as cardboard, corrugated cardboard, textiles, leather or plastic films.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)
  • Structure Of Belt Conveyors (AREA)
  • Laser Beam Processing (AREA)

Abstract

The invention relates to a device for processing flat elements, in particular for processing paper blanks, which has: an air-permeable transport belt (25) which is guided via at least two rollers (12a, 12b) and consists of metal and the upper section of which forms the transporting section (25a) and the lower section of which forms the returning section (25b); and a vacuum generator which is situated under the upper section. A laser for cutting the flat elements is arranged above the transporting section (25a). To achieve an improved flat position and a longer service life, the transport belt (25) consists of an expanded metal.

Description

Vorrichtung zur Bearbeitung flächiger Elemente und Transportband zum Einsatz in einer solchen Vorrichtung  Device for processing flat elements and conveyor belt for use in such a device
Beschreibung description
Die Erfindung betrifft eine Vorrichtung zur Bearbeitung flächiger Elemente nach dem Oberbegriff des Anspruchs 1 sowie ein Transportband zum Einsatz in einer solchen Vorrichtung nach Anspruch 21. The invention relates to a device for processing flat elements according to the preamble of claim 1 and a conveyor belt for use in such a device according to claim 21.
Wenn Elemente aus Papier oder andere flächige Elemente positionsgenau bewegt werden müssen, so ist es in der Technik bekannt, hierfür sogenannte Saug bänder einzusetzen. Solche Saugbänder bestehen in der Regel aus Gummi oder einem ähnlichen Material und weisen eine Vielzahl von Löchern auf. Die Transportvorrichtung weist wenigstens zwei Walzen auf, über welche dieses Saugband läuft und unterhalb des oberen Abschnittes des als Transportband dienenden Saugbandes (also unterhalb des Transportabschnittes des Transportbandes) ist ein mit Unterdrück beaufschlagbarer sogenannter Saugkasten vorgesehen, des- sen Oberseite eine Vielzahl von Öffnungen aufweist, so dass im Saugkasten wirkender Unterdrück zum einen den Transportabschnitt auf den Saugkasten ansaugt, und zum anderen Papier, welches sich auf der Oberfläche des Transport abschnittes befindet, auf diese Oberfläche ansaugt. If elements made of paper or other flat elements have to be moved precisely, it is known in the art to use so-called suction tapes for this. Such suction tapes are usually made of rubber or a similar material and have a plurality of holes. The transport device has at least two rollers, over which this suction belt runs, and below the upper section of the suction belt serving as the transport belt (that is, below the transport section of the transport belt) there is a so-called suction box which can be subjected to negative pressure, the upper side of which has a large number of openings, so that the vacuum acting in the suction box on the one hand sucks the transport section onto the suction box, and on the other hand paper that is on the surface of the transport section sucks onto this surface.
In der Technik sind weiterhin Laserschnittvorrichtungen bekannt geworden, mit deren Hilfe man sehr präzise Konturen aus Papier ausschneiden kann, um somit beispielsweise Buchstaben, Zahlen oder andere Zeichen in Form von Durchbrechungen zu erzeugen. Auch hier ist es natürlich notwendig, das Papier präzise hinsichtlich des Lasers zu positionieren bzw. zu transportieren, so dass auch hier der Einsatz entsprechender Saugbänder sinnvoll ist. Auf Grund der hohen thermi schen Belastung durch den Laser ist jedoch der Einsatz konventioneller Saugbänder, insbesondere aus einem Gummi oder einem gummiähnlichen Material, nicht möglich, bzw. würde zu einem extrem hohen Verschleiß führen. Zur Lösung dieses Problems ist es aus der gattungsbildenden WO 2014/121939 A1 bekannt, bei derartigen Laserschnittvorrichtungen ein Transportband aus ei- nem Metallgewebe einzusetzen. Hiervon ausgehend stellt sich die vorliegende Erfindung die Aufgabe, eine gattungsgemäße Vorrichtung weiter zu verbessern. Laser cutting devices have also become known in the art, with the aid of which very precise contours can be cut out of paper, in order to produce, for example, letters, numbers or other characters in the form of openings. Here, too, it is of course necessary to position or transport the paper precisely with respect to the laser, so that the use of appropriate suction belts also makes sense here. Due to the high thermal load by the laser, however, the use of conventional suction belts, in particular made of a rubber or a rubber-like material, is not possible or would lead to extremely high wear. To solve this problem, it is known from the generic WO 2014/121939 A1 to use a conveyor belt made of a metal mesh in such laser cutting devices. Proceeding from this, the object of the present invention is to further improve a generic device.
Diese Aufgabe wird durch eine Vorrichtung mit den Merkmalen des Anspruchs 1 gelöst. Ein Transportband zum Einsatz in einer solchen Vorrichtung ist in An- spruch 21 angegeben. This object is achieved by a device with the features of claim 1. A conveyor belt for use in such a device is specified in claim 21.
Erfindungsgemäß besteht das Transportband ebenfalls aus einem Metali, jedoch nicht aus einem Gewebe, sondern aus einem Streckmetall. Bahnen aus Streck- metall werden industriell in großem Maßstab hergestellt. Hierbei wird ein Metall- blech durch Walzen geführt, wobei wenigstens eine der Walzen eine Vielzahl von Zähnen aufweist, welche das Metallblech durchdringen, wodurch ein regelmäßi ges Lochmuster erzeugt wird. Die Löcher sind häufig rautenförmig in einem nachfolgenden Verfahrensschritt kann das so erzeugte Streckmetall kalandriert werden, dies bedeutet, dass es zwischen zwei auf Spalt angeordnete Walzen hindurchgepresst wird. Aus Streckmetall gefertigte Bauteile werden für die unter- schiedlichsten Anwendungen eingesetzt, beispielsweise als Filter oder Filterträger oder als Verkleidungselemente. Nahezu allen bisher genannten Einsatzzwecken ist gemeinsam, dass die Bauteile aus Streckmetall rein statisch verwendet wer den. According to the invention, the conveyor belt also consists of a metal, but not of a fabric, but of an expanded metal. Expanded metal sheets are industrially produced on a large scale. Here, a metal sheet is passed through rollers, at least one of the rollers having a plurality of teeth which penetrate the metal sheet, thereby producing a regular hole pattern. The holes are often diamond-shaped in a subsequent process step, the expanded metal produced in this way can be calendered, which means that it is pressed through between two rolls arranged on a gap. Components made of expanded metal are used for a wide variety of applications, for example as filters or filter carriers or as cladding elements. Almost all of the purposes mentioned so far have in common that the expanded metal components are used purely statically.
Es hat sich herausgestelit, dass aus Streckmetall hergestellte Endlosbänder für den oben genannten Zweck unter mehreren Gesichtspunkten hervorragend geeignet sind. Sie zeigen eine sehr gute Planlage, also kaum Wölbung im Transportbereich, sind sehr haltbar und zeigen auch ein gutes Streuverhalten bezüglich des aufkommenden Laserlichts, was die Qualität der erzeugten Produkte verbessert. Weiterhin lassen sich diese Bänder sehr gut reinigen. Besonders geeignete Arten von Streckmetall sind in den Ansprüchen 2 bis 10 an gegeben. It has been found that endless belts made of expanded metal are outstandingly suitable for the above-mentioned purpose in several respects. They show a very good flatness, i.e. hardly any curvature in the transport area, are very durable and also show good scattering behavior with regard to the emerging laser light, which improves the quality of the products produced. Furthermore, these tapes can be cleaned very well. Particularly suitable types of expanded metal are given in claims 2 to 10.
Die Achsen der beiden Umlenkrollen des Transportbandes liegen in der Regel in einer Ebene. Um ein seitliches„Wegwandern“ des Transportbandes zu verhindern, ist es bevorzugt, die Achse einer Umlenkrolle innerhalb dieser Ebene ver- schwenkbar zu halten, so dass der Winke! zwischen den Achsen der Umlenkrol- len veränderbar ist. Es ist weiter vorzugsweise eine Stelleinrichtung zur Verstellung dieser Achse vorgesehen, welche weiter vorzugsweise Teil eines Regelkrei- ses ist. In der Regel ist es ausreichend und auch bevorzugt, nur die nicht ange- triebene Achse zur verstellen. The axes of the two deflection rollers of the conveyor belt are usually in one plane. In order to prevent the conveyor belt from “wandering away” to the side, it is preferred to keep the axis of a deflection roller pivotable within this plane so that the angle! between the axes of the pulleys is changeable. Furthermore, an adjusting device for adjusting this axis is preferably provided, which is further preferably part of a control circuit. As a rule, it is sufficient and also preferred to adjust only the non-driven axis.
Weitere bevorzugte Ausführungsbeispiele ergeben sich aus den weiteren Unter- ansprüchen sowie aus dem nun mit Bezug auf die Figuren näher dargesteiiten Ausführungsbeispiel. Hierbei zeigen: Further preferred exemplary embodiments result from the further subclaims and from the exemplary embodiment now shown in more detail with reference to the figures. Here show:
Figur 1 einen stark schematisierten Querschnitt durch eine Laserschnitt- Vorrichtung, in welcher eine erfindungsgemäß verbesserte Transportvorrichtung eingesetzt ist, FIG. 1 shows a highly schematic cross section through a laser cutting device in which a transport device improved according to the invention is used,
Figur 2 eine schematische Draufsicht aus Richtung R auf die in Figur 2 gezeigte Transportvorrichtung ohne Eingangs- und Ausgangsrolle, FIG. 2 shows a schematic plan view from the direction R of the transport device shown in FIG. 2 without an input and output roller,
Figur 3 das Detail D aus Figur 2 (jedoch nicht maßstäblich), das heißt, ein Figure 3 shows the detail D from Figure 2 (but not to scale), that is, a
Stück Streckmetall, welches als Transportband dient,  Piece of expanded metal, which serves as a conveyor belt,
Figur 4 einen Schnitt entlang der Ebene A-A in Figur 3 und Figure 4 shows a section along the plane A-A in Figure 3 and
Figur 5 eine bevorzugte Ausführungsform einer Reinigungsstation. Figure 5 shows a preferred embodiment of a cleaning station.
Die Figur 1 zeigt in einer schematischen Querschnittsdarstellung eine Vorrichtung zur Erzeugung von Laserschnitten in flachen Papierzuschnitten wie Grußkarten oder dergleichen. Die Laserschnitt-Vorrichtung besteht aus vier Elementen, näm- lieh aus einer Zuführeinheit 40, einer Transportvorrichtung 10, einem oberhalb der Transportvorrichtung angeordneten Laser 30 und einer Abfuhreinheit 50. Die Transportrichtung des Papiers ist die Richtung T und die Vorrichtung kann kontinuierlich arbeiten, das heißt das Erzeugen der Schnittkonturen durch den Laser erfolgt bei gleichbleibender Transportbewegung durch die Transportvorrichtung 10. Die Figur 2 zeigt eine Draufsicht auf die Transportvorrichtung 10 der Figur 1 aus Richtung R. Figure 1 shows a schematic cross-sectional view of a device for generating laser cuts in flat paper blanks such as greeting cards or the like. The laser cutting device consists of four elements, namely borrowed from a feed unit 40, a transport device 10, a laser 30 arranged above the transport device and a discharge unit 50. The transport direction of the paper is the direction T and the device can work continuously, that is to say the cutting contours are produced by the laser with a constant transport movement through the transport device 10. FIG. 2 shows a plan view of the transport device 10 of FIG. 1 from the direction R.
Die Zuführeinheit 40 kann konventionell aufgebaut sein, nämlich bestehend aus einem Tisch 42 mit glatter Oberfläche und einer Reihe von Transportrollen 44, welche die Papierzuschnitte über dem Tisch gleitend der Transportvorrichtung 10 zuführen. Die Transportrollen 44 können gegenüber der Transportrichtung T leicht aus einem 90-Grad -Winkel herausgedreht sein und die Papierzuschnitte so an einen Anschlag drücken, sodass eine genauere Positionierung der Papierzu schnitte erreicht wird. Die Abfuhreinheit 50 kann ebenfalls konventionell aufgebaut sein und kann beispielsweise aus einem Anschlussstück 52 und einem Förder- band 54 bestehen. Es wäre jedoch beispielsweise genauso möglich, unmittelbar nach der Transportvorrichtung 10 einen Stapler oder dergleichen vorzusehen. The feed unit 40 can be constructed conventionally, namely consisting of a table 42 with a smooth surface and a row of transport rollers 44, which feed the paper blanks over the table to the transport device 10. The transport rollers 44 can be rotated slightly from a 90 degree angle with respect to the transport direction T and press the paper blanks against a stop so that a more precise positioning of the paper blanks is achieved. The removal unit 50 can also be constructed conventionally and can consist, for example, of a connecting piece 52 and a conveyor belt 54. However, it would also be possible, for example, to provide a stacker or the like immediately after the transport device 10.
Die wesentlichen Elemente der erfindungsgemäßen Transportvorrichtung 10 sind zwei Walzen 12a, 12b, wobei wenigstens eine der beiden Walzen, hier die in Papierflussrichtung hintere Walze 12b, mittels eines Motors 13 angetrieben ist, das Transportband 25 und eine Mehrzahl von Axiallüftern 16, welche unterhalb des oberen Abschnittes (also des jeweiligen Transportabschnitts) 25a des Transportbandes 25 angeordnet sind. Zur Positionierung dieser Axiallüfter 16 (diese Axiallüfter 16 können grundsätzlich aufgebaut sein wie konventionelle Lüfter für Com putergehäuse) dient ein in der Horizontalebene liegender Träger 14, welcher sich im Wesentlichen von der vorderen Walze 12a zur hinteren Walze 12b erstreckt. Dieser Träger 14 weist eine Vielzahl von Durchbrechungen auf; an den Positionen der Durchbrechungen sind die Axiallüfter 16 angeordnet, wie dies in Figur 1 nur sehr schematisch dargestefit ist. Der Träger 14 kann in Praxis auch wesentlich dünner ausgestaltet sein. Die Axiallüfter 16 befinden sich bevorzugt relativ nahe an der Unterseite des oberen Abschnittes 25a des Transportbandes. Die Achsen 12a‘ und 12b‘ der Walzen liegen in einer Ebene und die Achse 12b‘ der angetriebenen Walze 12b erstreckt sich vorzugsweise genau senkrecht zur Transportrichtung T. Der Winkel der nicht angetriebenen Achse 12a‘ ist zur Transportrichtung innerhalb der Ebene leicht veränderbar, um ein seitliches„Weg- laufen“ des Transportbandes 25 zu verhindern. In der Regel reichen wenige zehn- tel Grad um die neutrale Position (in welcher die nicht angetriebene 12a‘ Achse parallel zur angetriebenen Achse 12b‘ ist) herum aus. Es hat sich nämlich her- ausgestellt, dass ein erfindungsgemäßes, aus einem Streckmetall bestehendes Transportband 5 ohne geeignete Gegenmaßnahmen hierzu neigen würde. Um diesen Winkel verändern zu können, ist ein Stellelement 80 vorgesehen, welches auf ein Lager 15 der nicht angetriebenen Achse 12a' wirkt. Dieses Stellelement kann beispielsweise als Linearmotor oder als Servomotor ausgeführt sein. Das Stellelement 80 kann so ausgestaltet sein, dass es eine kontinuierliche Verstel- lung des Winkels der Achse oder nur eine schrittweise Verstellung desselben er- laubt. The essential elements of the transport device 10 according to the invention are two rollers 12a, 12b, wherein at least one of the two rollers, here the roller 12b in the paper flow direction, is driven by a motor 13, the conveyor belt 25 and a plurality of axial fans 16, which are below the upper one Section (ie the respective transport section) 25a of the conveyor belt 25 are arranged. To position these axial fans 16 (these axial fans 16 can basically be constructed like conventional fans for computer housings), a carrier 14 is located in the horizontal plane, which essentially extends from the front roller 12a to the rear roller 12b. This carrier 14 has a plurality of openings; The axial fans 16 are arranged at the positions of the openings, as is shown only very schematically in FIG. In practice, the carrier 14 can also be made substantially thinner. The axial fans 16 are preferably located relatively close to the underside of the upper section 25a of the conveyor belt. The axes 12a 'and 12b' of the rollers lie in one plane and the axis 12b 'of the driven roller 12b preferably extends exactly perpendicular to the transport direction T. The angle of the non-driven axis 12a' can easily be changed to the transport direction within the plane by one to prevent the conveyor belt 25 from “running away” to the side. As a rule, a few tenths of a degree around the neutral position (in which the non-driven 12a 'axis is parallel to the driven axis 12b') are sufficient. It has been found that a conveyor belt 5 according to the invention consisting of an expanded metal would tend to do so without suitable countermeasures. In order to be able to change this angle, an adjusting element 80 is provided which acts on a bearing 15 of the non-driven axis 12a '. This control element can be designed, for example, as a linear motor or as a servo motor. The adjusting element 80 can be designed in such a way that it permits a continuous adjustment of the angle of the axis or only a gradual adjustment thereof.
Das Stellelement wird von einer Steuerung 82 angesteuert, welche wiederum In- formationen von wenigstens einem Bandpositionssensor erhält. Im dargestellten Ausführungsbeispiel sind zwei Bandpositionssensoren vorhanden, nämlich ein rechter Bandpositionssensor 84 und ein linker Bandpositionssensor 86. Diese Bandpositionssensoren können beispielsweise als einfache Lichtschranken ausgebildet sein, welche ein Signal an die Steuerung abgeben, wenn die Bandkante eine vorgegebene Position nach außen überschreitet. Wird der Steuerung eine Positionsüberschreitung nach rechts gemeldet, so steuert diese das Stellelement so an, dass das Lager 15 in Richtung A bewegt wird, wodurch sich das Band zu rück zur Mitte bewegt. Wird der Steuerung eine Positionsüberschreitung nach links gemeldet, so steuert diese das Stellelement so an, dass das Lager 15 in Richtung B bewegt wird. Es ist also ein einfacher Regelkreis zur Zentrierung des Transportbandes gebildet. Natürlich könnte auch ein aufwendigerer (gegebenen- falls einziger) Bandpositionssensor eingesetzt werden. In der Regel ist eine solche Zentrierung an einem Bandende (vorzugsweise am nicht angetriebenen Ende des Transportbandes) ausreichend. Die Stelleinrichtung kann so ausgebildet sein, dass sie beide Bewegungen aktiv ausführt, oder das Lager 15 kann in einer Richtung (beispielsweise mittels einer Feder) vorgespannt sein. Das Transportband 25 ist erfindungsgemäß als Streckmetaliband ausgeführt, wozu die Stirnseiten eines Streckmetall-Streifens passender Länge und Breite miteinander verbunden sind, insbesondere mittels Plasma- oder Laserschweißen. Vor diesem Verbinden wird der Streckmetall-Streifen vorzugsweise kalandriert. Die Figur 3 zeigt einen kleinen Ausschnitt eines geeigneten Streckmetalls, die Figur 4 zeigt einen Schnitt entlang der Ebene A-A in Figur 3. Die Durchbrechungen des Streckmetalls sind zueinander gleichartige Rauten mit einer ersten Achse A1 und einer zweiten Achse A2. Vorzugsweise sind die Achsen ungleich lang und die kürzeren Achsen (hier die ersten Achsen A1) zeigen in Transportrichtung T. Hierdurch ist das Transportband zwischen den Walzen sehr eben und passt sich dennoch den Radien der Walzen an. Vorzugsweise beträgt die Länge der ersten Achsen A1 zwischen 1 ,5 mm und 4 mm und die Länge der zweiten Achsen zwi- schen 2,5 mm und 6 mm. Der freie Querschnitt des Transportbandes beträgt vor zugsweise zwischen 50% und 70%. The control element is controlled by a controller 82, which in turn receives information from at least one belt position sensor. In the exemplary embodiment shown, there are two belt position sensors, namely a right belt position sensor 84 and a left belt position sensor 86. These belt position sensors can be designed, for example, as simple light barriers which emit a signal to the control when the belt edge exceeds a predetermined position to the outside. If the control is notified that the position has been exceeded to the right, it controls the actuating element in such a way that the bearing 15 is moved in direction A, as a result of which the belt moves back towards the center. If the control is notified that the position has been exceeded to the left, it controls the actuating element in such a way that the bearing 15 is moved in the direction B. A simple control loop for centering the conveyor belt is thus formed. Of course, a more complex (possibly only) belt position sensor could also be used. As a rule, such centering at one end of the belt (preferably at the non-driven end of the conveyor belt) is sufficient. The actuating device can be designed such that it actively carries out both movements, or the bearing 15 can be preloaded in one direction (for example by means of a spring). According to the invention, the conveyor belt 25 is designed as an expanded metal belt, for which purpose the end faces of an expanded metal strip of suitable length and width are connected to one another, in particular by means of plasma or laser welding. Before this connection, the expanded metal strip is preferably calendered. FIG. 3 shows a small section of a suitable expanded metal, FIG. 4 shows a section along the plane AA in FIG. 3. The perforations of the expanded metal are diamonds of the same type with a first axis A1 and a second axis A2. The axes are preferably of unequal length and the shorter axes (here the first axes A1) point in the transport direction T. As a result, the conveyor belt between the rollers is very flat and nevertheless adapts to the radii of the rollers. The length of the first axes A1 is preferably between 1.5 mm and 4 mm and the length of the second axes between 2.5 mm and 6 mm. The free cross section of the conveyor belt is preferably between 50% and 70%.
Wie man der Figur 4 entnimmt, ist die Dicke des Streckmetalls im Bereich der „Knoten“, welche zwischen jeweils vier Durchbrechungen angeordnet sind, nach einer Seite etwas erhöht, sodass sich eine im Wesentlichen ebene erste Oberfläche 26a und eine zweite Oberfläche 26b mit leichten Erhöhungen 26b ergibt. Diese Struktur ergibt sich bei vielen kalandrierten Streckmetallen automatisch. Die Stirnseiten des Streckmetalistreifens sind so zum Transportband verbunden, dass die erste Oberfläche 26a nach innen und die zweite Oberfläche 26b nach außen zeigt, sodass die transportierten Bögen im Transportabschnitt 25a ausschließlich auf diesen Erhöhungen 26b' aufliegen. Dies hat unter anderem Vorteile hinsicht- lieh der Rückreflexion der Laserstrahlen. Die Gesamtdicke dg des Streckmetalls beträgt vorzugsweise zwischen 0,2 mm und 0,5 mm. Das Streckmetall besteht vorzugsweise aus Edelstahl. As can be seen from FIG. 4, the thickness of the expanded metal in the region of the “nodes”, which are arranged between four openings in each case, is slightly increased on one side, so that an essentially flat first surface 26a and a second surface 26b with slight increases 26b results. This structure arises automatically with many calendered expanded metals. The end faces of the expanded metal strip are connected to the conveyor belt in such a way that the first surface 26a points inwards and the second surface 26b outwards, so that the transported sheets in the transport section 25a rest exclusively on these elevations 26b '. Among other things, this has advantages in terms of the back reflection of the laser beams. The total thickness d g of the expanded metal is preferably between 0.2 mm and 0.5 mm. The expanded metal is preferably made of stainless steel.
Optional kann die Transportvorrichtung 10 noch beispielsweise folgende darge- stellte Elemente aufweisen: Eingangsrollen 23, eine Ausgangsrolle 20 und eine untere Reinigungsbürste 22 oder eine Reinigungsstation. Eine bevorzugte Aus führungsform einer solchen Reinigungsstation wird später mit Bezug auf die Figur 5 erläutert. Oberhalb der Transportvorrichtung 10 ist der Schnittlaser 30 angeordnet. Optionally, the transport device 10 can also have the following elements, for example: input rollers 23, an output roller 20 and a lower cleaning brush 22 or a cleaning station. A preferred embodiment of such a cleaning station will be explained later with reference to FIG. 5. The cutting laser 30 is arranged above the transport device 10.
Der Betrieb der Vorrichtung erfolgt, wie dies bereits erwähnt wurde, kontinuierlich und bei vorzugsweise konstanter Transportgeschwindigkeit. Durch die Axiallüfter 16, welche Luft durch den oberen Abschnitt 25a des Transportbandes 25 saugen, werden die von der Zuführeinheit 40 positionsgenau zugeführten Papierzuschnitte in Position gehalten. Die von den Axiallüftern 16 ausgestoßene Luft tritt durch den unteren Abschnitt 25b des Transportbandes wieder aus und trägt somit weiterhin zu einer Reinigung des rücklaufenden Abschnittes des Transportbandes 25 bei. Das Vorsehen von Axiallüftern hat gegenüber dem Vorsehen eines Saugkastens noch die weiteren großen Vorteile eines deutlich verringerten Energiebedarfes und einer deutlich verringerten Geräuschentwicklung (bei herkömmlichen Saug- kästen werden in der Regel Radialverdichter als Unterdruckerzeuger eingesetzt). As already mentioned, the device is operated continuously and preferably at a constant transport speed. By means of the axial fans 16, which suck air through the upper section 25a of the conveyor belt 25, the paper blanks fed by the feed unit 40 are held in position. The air expelled by the axial fans 16 exits through the lower section 25b of the conveyor belt and thus continues to contribute to cleaning the returning section of the conveyor belt 25. The provision of axial fans has, compared to the provision of a suction box, the further great advantages of a significantly reduced energy requirement and a significantly reduced noise level (in conventional suction boxes, radial compressors are generally used as vacuum generators).
Der Laser 30 schneidet die auf dem oberen Abschnitt des Transportbandes lie- genden Papierzuschnitte, welche die Transportvorrichtung 10 an der hinteren Walze 12b verlassen und über die Abfuhreinheit 50 abgeführt werden. The laser 30 cuts the paper blanks lying on the upper section of the conveyor belt, which cuts out of the transport device 10 on the rear roller 12b and are removed via the removal unit 50.
Um das Transportband 25 spannen zu können, weist zumindest ein Ende jeder Seitenwange einen sich in Transportrichtung erstreckenden Schlitz auf, durch welchen sich die Achse einer Walze erstreckt, sodass der Abstand der beiden Walzen 12a, 12b veränderbar ist und somit das Transportband 25 gespannt wer den kann. Dies ist hier nicht im Detail beschrieben, jedoch aus der gattungsbildenden WO 2014/121939 A1 bekannt. Somit kann das Transportband 25 auch im fertigen, also zu einer Endlosschlaufe geschweißten Zustand, montiert werden, wobei es seitlich auf die Walzen 12a, 12b aufgeschoben wird, hierbei müssen gegebenenfalls Nebenaggregate wie die Eingangsrollen 23 usw. abmontiert sein. Die Figur 5 zeigt eine bevorzugte Ausgestaltung einer Reinigungsstation 70, wel- che unterhalb des rücklaufenden Abschnitts 25 des Transportbandes 25, beispielsweise an der Stelle der oben erwähnten Reinigungsbürste 22, angeordnet werden kann. Diese Reinigungsstation 70 weist eine um eine Achse 73 antreibba- re Reinigungswalze 71 und einen oben offenen Behälter 76 zur Aufnahme von Reinigungsflüssigkeit 77 (im einfachsten Fall Wasser) auf. Vorzugsweise ist weiterhin eine Abstreifwalze 78 vorgesehen, welche gegenläufig zur Reinigungswal ze angetrieben wird. Zumindest die äußere Mantelschicht der Reinigungswalze 71 ist als Schwamm (Schwamm-Mantel 74 - Figur 11) oder in Form einer Bürste (Bürsten-Mantel 75 - Figur 12) ausgebildet. Die Reinigungswalze 71 wird vor- zugsweise in der selben Drehrichtung wie die Walzen 12a, 12b angetrieben. In order to be able to tension the conveyor belt 25, at least one end of each side cheek has a slot which extends in the transport direction and through which the axis of a roller extends, so that the distance between the two rollers 12a, 12b can be changed and thus the conveyor belt 25 is tensioned can. This is not described in detail here, but is known from the generic WO 2014/121939 A1. Thus, the conveyor belt 25 can also finished, so welded to form an endless loop, where it is pushed laterally onto the rollers 12a, 12b, in this case auxiliary units such as the input rollers 23, etc. may have to be removed. FIG. 5 shows a preferred embodiment of a cleaning station 70, which can be arranged below the returning section 25 of the conveyor belt 25, for example at the location of the cleaning brush 22 mentioned above. This cleaning station 70 has a cleaning roller 71 which can be driven about an axis 73 and a container 76 open at the top for receiving cleaning liquid 77 (in the simplest case water). Preferably, a stripping roller 78 is also provided, which is driven in the opposite direction to the cleaning roller ze. At least the outer jacket layer of the cleaning roller 71 is designed as a sponge (sponge jacket 74 - FIG. 11) or in the form of a brush (brush jacket 75 - FIG. 12). The cleaning roller 71 is preferably driven in the same direction of rotation as the rollers 12a, 12b.
Die Reinigungswalze 71 ist so positioniert, dass sie von unten gegen den rücklau- fenden Abschnitt 25b des Transportbandes 25 drückt und mit einem unteren Teil in die Reinigungsflüssigkeit 77 eintaucht. Durch die Drehung der Reinigungswalze wird ständig neue Reinigungsflüssigkeit 77 aufgenommen und zum rücklaufenden Abschnitt 25b des Transportbandes gefördert. Durch die Abstreifrolle, welche in Drehrichtung der Reinigungswalze zwischen der Reinigungsflüssigkeit und dem Transportband angeordnet ist, lässt sich das Maß der Befeuchtung des rücklau fenden Abschnitts einstellen. Hierzu ist der radiale Abstand zwischen Reini- gungswalze und Abstreifwalze 78 vorzugsweise einstellbar. The cleaning roller 71 is positioned so that it presses against the returning section 25b of the conveyor belt 25 from below and dips into the cleaning liquid 77 with a lower part. New cleaning liquid 77 is constantly taken up by the rotation of the cleaning roller and conveyed to the returning section 25b of the conveyor belt. By the scraper roller, which is arranged in the direction of rotation of the cleaning roller between the cleaning liquid and the conveyor belt, the degree of moistening of the returning portion can be adjusted. For this purpose, the radial distance between cleaning roller and stripping roller 78 is preferably adjustable.
Die feuchte Reinigung (insbesondere mithilfe der eben beschriebenen Reini gungsstation) hat mehrere Vorteile. Zunächst lässt sich eine gute Reinigung des Transportbandes von Abbrand, Asche und dergleichen erzielen. Weiterhin hat auch die Befeuchtung des Transportbandes als solche Vorteile: Zum einen ent steht - zusätzlich begünstigt durch die Anordnung der Axiallüfter - Verdunstungs- käite, das heißt, das Transportband, dessen oberer Abschnitt 25a mit Laserenergie beaufschlagt wird, wird gekühlt. Weiterhin kann die Befeuchtung so eingestellt werden, dass dem Transportband auch noch an seinem oberen Abschnitt 25a eine gewisse Menge an Flüssigkeit anhaftet. Diese anhaftende Flüssigkeit ver- bessert die Adhäsion von Abbrand, Asche und dergleichen, sodass diese die Rückseite des bearbeiteten Papiers nicht verschmutzen. Die Gewebestruktur des metallenen Transportbandes begünstigt stark das gewollte Anhaften von Flüssigkeit. Wet cleaning (especially using the cleaning station just described) has several advantages. First of all, a good cleaning of the conveyor belt from burns, ashes and the like can be achieved. Furthermore, the moistening of the conveyor belt as such also has advantages: On the one hand, evaporation boxes are created - additionally favored by the arrangement of the axial fans - that is, the conveyor belt, the upper section 25a of which is exposed to laser energy, is cooled. Humidification can also be set in this way that a certain amount of liquid also adheres to the upper section 25a of the conveyor belt. This adhering liquid improves the adhesion of burn-up, ash and the like so that they do not contaminate the back of the processed paper. The fabric structure of the metal conveyor belt strongly favors the intended adhesion of liquid.
Abschließend sei noch zu erwähnen, dass sich die beschriebene Bearbeitungs- Vorrichtung außer für die Bearbeitung von Papier auch für die Bearbeitung ande- rer flächiger Elemente wie beispielsweise Pappe, Wellpappe, Textilien, Leder o- der Kunststofffolien eignet. Finally, it should also be mentioned that the processing device described is suitable not only for processing paper but also for processing other flat elements such as cardboard, corrugated cardboard, textiles, leather or plastic films.

Claims

Patentansprüche claims
1. Vorrichtung zur Bearbeitung flächiger Elemente, insbesondere zur Bearbei tung von Papierzuschnitten, mit 1. Device for processing flat elements, in particular for processing paper blanks, with
einer Transportvorrichtung und einem Laser (30) zum Schneiden der flächigen Elemente,  a transport device and a laser (30) for cutting the flat elements,
wobei die Transportvorrichtung (10)  wherein the transport device (10)
ein über eine erste Umlenkrolle (12a) und eine zweite Umlenkrolle (12b) geführtes, aus Metall bestehendes, luftdurchlässiges Transportband (25), dessen oberer Abschnitt den Transportabschnitt (25a) und dessen unterer an air-permeable conveyor belt (25) made of metal and guided over a first deflection roller (12a) and a second deflection roller (12b), the upper section of which is the transport section (25a) and the lower section
Abschnitt den rücklaufenden Abschnitt (25b) bildet, aufweist, und Section forms the return section (25b), and
wobei der Laser (30) oberhalb des Transportabschnitts (25a) angeordnet ist,  the laser (30) being arranged above the transport section (25a),
dadurch gekennzeichnet, dass das Transportband (25) aus einem Streck- metall besteht.  characterized in that the conveyor belt (25) consists of an expanded metal.
2. Vorrichtung nach Anspruch 1 , dadurch gekennzeichnet, dass das Trans portband (25) aus einem insbesondere aus Stahl bestehenden Streckmetall-Streifen hergestellt ist. 2. Device according to claim 1, characterized in that the trans port belt (25) is made of an expanded metal strip, in particular made of steel.
3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass der Streck- metall-Streifen kalandriert ist. 3. Device according to claim 2, characterized in that the expanded metal strip is calendered.
4. Vorrichtung nach Anspruch 2 oder Anspruch 3, dadurch gekennzeichnet, dass die Stirnseiten des Streckmetall-Streifens plasma- oder laserverschweißt sind. 4. The device according to claim 2 or claim 3, characterized in that the end faces of the expanded metal strip are plasma or laser welded.
5. Vorrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der freie Querschnitt des Streckmetalls zwischen 50% und 70% beträgt. 5. Device according to one of the preceding claims, characterized in that the free cross section of the expanded metal is between 50% and 70%.
6. Vorrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Durchbrechungen (27) des Streckmetalls gleichartige und gleichartig orientierte Rauten sind, sodass jede Raute eine erste Achse (A1) und eine zweite Achse (A2) aufweist, wobei die ersten Achsen (A1) in Transportrichtung (T) und die zweiten Achsen (A2) senkrecht zur Transportrichtung (T) orientiert sind. 6. Device according to one of the preceding claims, characterized in that the openings (27) of the expanded metal of the same type and are similarly oriented diamonds, so that each diamond has a first axis (A1) and a second axis (A2), the first axes (A1) being oriented in the transport direction (T) and the second axes (A2) perpendicular to the transport direction (T) are.
7. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, dass zumindest die äußere Oberfläche (26b) des Transportbands, vorzugsweise ausschließlich die äußere Oberfläche (26b), an den Knotenpunkten, an wel- chen jeweils vier Rauten Zusammentreffen, jeweils eine Erhöhung (26b‘) aufweist. 7. The device according to claim 6, characterized in that at least the outer surface (26b) of the conveyor belt, preferably exclusively the outer surface (26b), has an elevation (26b ') at the nodes at which four diamonds meet. having.
8. Vorrichtung nach Anspruch 6 oder Anspruch 7, dadurch gekennzeichnet, dass die ersten Achsen (A1) kürzer als die zweiten Achsen (A2) sind. 8. The device according to claim 6 or claim 7, characterized in that the first axes (A1) are shorter than the second axes (A2).
9. Vorrichtung nach einem der Ansprüche 6 bis 8, dadurch gekennzeichnet, dass die ersten Achsen (A1) eine Länge zwischen 1 ,5 mm und 9. Device according to one of claims 6 to 8, characterized in that the first axes (A1) have a length between 1.5 mm and
4 mm und die zweiten Achsen (A2) eine Länge zwischen 2,5 mm und 6 mm aufweisen.  4 mm and the second axes (A2) have a length between 2.5 mm and 6 mm.
10. Vorrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass das Transportband eine Dicke (dg) zwischen 0,2 mm und 0,5 mm aufweist. 10. Device according to one of the preceding claims, characterized in that the conveyor belt has a thickness (d g ) between 0.2 mm and 0.5 mm.
11. Vorrichtung nach einem der vorangehenden Ansprüche, dadurch gekenn- zeichnet, dass die Achsen (12a‘, 1 b ) der beiden Umlenkrollen (12a, 12b) in einer Ebene liegen und dass zumindest die Achse (12a‘) der ersten Umlenkrolle (12a) innerhalb dieser Ebene verschwenkbar ist, sodass der Winkel zwischen den Achsen (12a\ 12b‘) der Umlenkrollen (12a, 12b) verän- derbar ist. 11. Device according to one of the preceding claims, characterized in that the axes (12a ', 1b) of the two deflection rollers (12a, 12b) lie in one plane and that at least the axis (12a') of the first deflection roller (12a ) can be pivoted within this plane, so that the angle between the axes (12a \ 12b ') of the deflection rollers (12a, 12b) can be changed.
12. Vorrichtung nach Anspruch 11 , dadurch gekennzeichnet, dass die erste Umlenkrolle (12a) nicht angetrieben ist und die zweite Umlenkrolle (12b) angetrieben ist. 12. The apparatus according to claim 11, characterized in that the first deflection roller (12a) is not driven and the second deflection roller (12b) is driven.
13. Vorrichtung nach Anspruch 11 oder Anspruch 12, dadurch gekennzeichnet, dass wenigsten ein Sensor (84, 86) zur Bestimmung der Querposition des Transportbandes (25) an wenigstens einer Stelle vorgesehen ist, und dass ein auf die Achse (12a‘) der ersten Umlenkrolle (12a) wirkendes Stellmittel (80) vorgesehen ist, welches den Winkel der Achse (12a') bezüglich der13. The apparatus of claim 11 or claim 12, characterized in that at least one sensor (84, 86) for determining the transverse position of the conveyor belt (25) is provided at at least one point, and that one on the axis (12a ') of the first Deflection roller (12a) acting adjusting means (80) is provided, which the angle of the axis (12a ') with respect to
Transportrichtung (T) in Abhängigkeit der vom wenigstens einen Sensor (84, 86) bestimmten Bandposition verändert. Transport direction (T) changes depending on the belt position determined by the at least one sensor (84, 86).
14. Vorrichtung nach einem der vorangehenden Ansprüchen, dadurch gekenn- zeichnet, dass zwischen Transportabschnitt (25a) und rücklaufendem Ab- schnitt (25b) wenigstens ein Unterdruckerzeuger, vorzugsweise in Form wenigstens eines Axiallüfters (16) angeordnet ist. 14. Device according to one of the preceding claims, characterized in that at least one vacuum generator, preferably in the form of at least one axial fan (16), is arranged between the transport section (25a) and the returning section (25b).
15. Vorrichtung nach einem der vorangehenden Ansprüche, dadurch gekenn- zeichnet, dass wenigstens eine Reinigungsvorrichtung vorgesehen ist, wel che auf den rücklaufenden Abschnitt (25b) wirkt. 15. Device according to one of the preceding claims, characterized in that at least one cleaning device is provided which acts on the returning section (25b).
16. Vorrichtung nach Anspruch 15, dadurch gekennzeichnet, dass die Reini gungsvorrichtung das Transportband (25) befeuchtet. 16. The apparatus according to claim 15, characterized in that the cleaning device moistens the conveyor belt (25).
17. Vorrichtung nach Anspruch 16, dadurch gekennzeichnet, dass die Reini- gungsvorrichtung als Reinigungsstation (70) mit einer antreibbaren Reini- gungswalze (71) und einem mit Flüssigkeit befüllbaren, oben offenen Be- hälter (76) ausgebildet ist, wobei die Reinigungswalze (71) derart positio- niert ist, dass ein oberer Abschnitt ihrer Oberfläche den rücklaufenden Ab- schnitt (25b) des Transportbandes (25) berührt und dass sich ein unterer Teil der Reinigungswalze innerhalb des Behälters (76) befindet. 17. The device according to claim 16, characterized in that the cleaning device is designed as a cleaning station (70) with a drivable cleaning roller (71) and a container (76) which can be filled with liquid and is open at the top, the cleaning roller ( 71) is positioned such that an upper section of its surface touches the returning section (25b) of the conveyor belt (25) and that a lower part of the cleaning roller is located inside the container (76).
18. Vorrichtung nach Anspruch 17, dadurch gekennzeichnet, dass sich die Achse (73) der Reinigungswalze (71) parallel zu den Achsen der Walzen (12a, 12b) erstreckt. 18. The apparatus according to claim 17, characterized in that the axis (73) of the cleaning roller (71) extends parallel to the axes of the rollers (12a, 12b).
19. Vorrichtung nach Anspruch 18, dadurch gekennzeichnet, dass die Reini- gungswalze (71 ) in derselben Drehrächtung wie die Walzen (12a, 12b) an- getrieben wird. 19. The device according to claim 18, characterized in that the cleaning roller (71) is driven in the same rotational direction as the rollers (12a, 12b).
20. Vorrichtung nach einem der Ansprüche 17 bis 19, dadurch gekennzeichnet, dass weiterhin eine sich parallel zur Reinigungswalze (71) erstreckende, vorzugsweise gegenläufig zur Reinigungswalze antreibbare Abstreifwalze (78) vorgesehen ist, welche einen Abschnitt der Oberfläche der Reinigungswalze (71 ) berührt 20. Device according to one of claims 17 to 19, characterized in that a stripping roller (78), which extends parallel to the cleaning roller (71) and is preferably drivable in the opposite direction to the cleaning roller, is provided, which touches a section of the surface of the cleaning roller (71)
21. Transportband (25) zur Verwendung in einer Vorrichtung nach einem der Ansprüche 1 bis 20. 21. Conveyor belt (25) for use in a device according to one of claims 1 to 20.
EP19753033.0A 2018-08-16 2019-08-08 Device for processing flat elements and transport belt for use in a device of this type Active EP3837200B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018119971.6A DE102018119971B4 (en) 2018-08-16 2018-08-16 Device for processing flat elements
PCT/EP2019/071355 WO2020035396A1 (en) 2018-08-16 2019-08-08 Device for processing flat elements and transport belt for use in a device of this type

Publications (3)

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EP3837200A1 true EP3837200A1 (en) 2021-06-23
EP3837200C0 EP3837200C0 (en) 2024-03-13
EP3837200B1 EP3837200B1 (en) 2024-03-13

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EP19753033.0A Active EP3837200B1 (en) 2018-08-16 2019-08-08 Device for processing flat elements and transport belt for use in a device of this type

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US (1) US11584600B2 (en)
EP (1) EP3837200B1 (en)
DE (1) DE102018119971B4 (en)
WO (1) WO2020035396A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PL438271A1 (en) * 2021-06-25 2022-12-27 Grafotronic Spółka Z Ograniczoną Odpowiedzialnością Vacuum conveyor, method for cleaning a vacuum conveyor, and a laser cutting apparatus comprising a vacuum conveyor

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US2109079A (en) * 1935-08-10 1938-02-22 Kenneth O Zeigler Broiling apparatus
US2347430A (en) * 1940-10-18 1944-04-25 James J O'brien Article holding means for cleaning machines
US2917768A (en) * 1957-05-08 1959-12-22 Fearn Foods Inc Air cleaning machine for containers
US6095218A (en) * 1997-07-16 2000-08-01 New Jersey Machine, Inc. Transfer system for transporting articles cut from a blank of material
US7544384B2 (en) * 2003-11-24 2009-06-09 The Gillette Company Methods of making coated battery components
JP4086310B2 (en) * 2005-01-25 2008-05-14 日東電工株式会社 Manufacturing method of optical film
DE102013002122A1 (en) 2013-02-08 2014-08-14 Jörg Scheffler Transport device for paper and paper processing device
US9688474B2 (en) * 2014-01-24 2017-06-27 Lasx Industries, Inc. Metal belt for laser materials processing
JP2017013041A (en) * 2014-12-22 2017-01-19 三星電子株式会社Ｓａｍｓｕｎｇ Ｅｌｅｃｔｒｏｎｉｃｓ Ｃｏ．，Ｌｔｄ． Electrostatic precipitator
EP3196036B1 (en) 2016-01-25 2018-11-21 OCE Holding B.V. Method for controlling a lateral position of an endless belt of a belt conveyor system

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EP3837200C0 (en) 2024-03-13
DE102018119971B4 (en) 2022-03-24
DE102018119971A1 (en) 2020-02-20
US11584600B2 (en) 2023-02-21
EP3837200B1 (en) 2024-03-13
WO2020035396A1 (en) 2020-02-20
US20210300699A1 (en) 2021-09-30

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