EP0583662A1 - Blowing device for loosening the upper sheets of a sheet pile - Google Patents
Blowing device for loosening the upper sheets of a sheet pile Download PDFInfo
- Publication number
- EP0583662A1 EP0583662A1 EP93112122A EP93112122A EP0583662A1 EP 0583662 A1 EP0583662 A1 EP 0583662A1 EP 93112122 A EP93112122 A EP 93112122A EP 93112122 A EP93112122 A EP 93112122A EP 0583662 A1 EP0583662 A1 EP 0583662A1
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- European Patent Office
- Prior art keywords
- plate
- blowing device
- sheet
- base body
- sheets
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- 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.)
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H3/00—Separating articles from piles
- B65H3/46—Supplementary devices or measures to assist separation or prevent double feed
- B65H3/48—Air blast acting on edges of, or under, articles
Definitions
- the invention relates to a blowing device for loosening the upper sheets of a sheet stack according to the preamble of claim 1.
- the top sheet of a sheet stack is removed in each case and then fed to the processing stage following the sheet stack.
- the uppermost sheet is usually removed using lifting and dragging suction devices, which use vacuum to grasp this uppermost sheet.
- lifting and dragging suction devices which use vacuum to grasp this uppermost sheet.
- blowing devices are often used which have one or a plurality of air outlet nozzles and thus introduce one or more air jets into the edge region of the upper sheets.
- Blowing devices of the type briefly outlined above are known, for example, from EP 0 364 737 A2 and DE 2 906 873 A1.
- the blowing device of EP 0 364 737 A2 has an airflow-generating device in the form of a fan and can be adjusted laterally next to the sheet stack, both in height and in width, and is additionally adjustable in the blowing capacity. In particular, by regulating the blowing power but also by the adjustable attachment, an individual blowing air supply is in accordance with to achieve the present conditions.
- the blowing devices according to DE 2 906 873 A1 provide not only one but a plurality of air outlet openings arranged in one surface, by means of which a large number of individual air jets each act on the upper sheets of a sheet stack. Since several air outlet openings are provided in one area, a larger area in the upper region of the sheet stack can be blown with a corresponding design than is the case, for example, with a device according to the first-mentioned document.
- blowing air capacity must be set for loosening with thinner substrates than with thick substrates.
- a lower blowing air flow is sufficient for thin substrates.
- a disadvantage of the known blowing devices is that one or more air jets, which are bundled relatively sharply and thus have a high flow velocity, act directly on the edge areas of the sheet stack and thus, in particular, cause fluttering and not the intended separation of the sheets in the edge area. If one now tries to counteract such an incomplete loosening of the upper bends by increasing the blown air flow (increasing the blowing power), then usually only an increase in the flutter of the upper bend (s) is achieved.
- the flutter of an arch is generated by the acute-angled or almost parallel flow around the edge of the arch through the blowing air and the formation of eddies. Swinging or fluttering of the uppermost sheet to be removed from a sheet stack can thus lead to a malfunction in sheet detection (incorrect suction).
- the object of the present invention is therefore to expand a blowing device according to the preamble of claim 1 in such a way that, with a structurally simple design, both good loosening can be achieved and, in particular, disturbance-causing oscillation of the top sheet can be avoided.
- the surface having the air outlet openings is designed as a plate with a microporous and thus overall air-permeable structure.
- a plate can be created, for example, by sintering spherical, granular or thread-like particles, these particles consisting of metal, mineral fibers or plastic.
- a starting product which can be used for the production of a plate in the blowing device according to the invention is known under the trade name "Siperm".
- the plurality of air outlet openings are formed by the microporous structure of a plate, through which compressed air is blown out, a turbulent flow in the macroscopic - that is, based on the dimensions of the blowing device - results in an overall laminar flow .
- the compressed air emerges more or less uniformly over the entire surface of the plate.
- a blowing device designed according to the prior art with a plurality of air outlet openings in the form of bores within a surface thus generates a plurality of air jets in which there are very steep speed transitions between the interior and the area outside the individual air jets. Blown air, which is directed in this way and still meets the edge of a sheet at an acute angle or parallel, causes the sheets to vibrate due to turbulence. If two sheets stick together in the area of their blunt or frayed cut edges, a relatively sharply focused air jet often only depresses such a pair, so that these sheets are not separated due to the blowing air.
- blowing device This effect is avoided by the blowing device according to the invention because the blowing air flows through a plate with a microporous structure and thus penetrates uniformly over this surface into the area of the edges of the sheets to be loosened. In the area of an air outlet surface designed in this way there is a "flushing effect" by the escaping compressed air. The air speed is lower overall and acts over a larger area on the edge of each sheet, so that swinging cannot occur.
- the blowing device according to the invention also prevents pressing of arcs connected in the edge region from the flow region of the air.
- the blowing device according to the invention is preferably provided multiple times on the feeder stack of a sheet-processing printing press and is arranged, for example, on the edges of the format length and / or on the edges of the format width of the sheet stack.
- the air outlet plate provided according to the invention can be brought as close as possible to the edges of the sheet stack by means of an adjustable suspension. This results in an optimal loosening effect of the blowing device according to the invention.
- the blowing device according to the invention can additionally cooperate with blowers constructed according to the prior art, so that even large formats can then be separated at lower air jet speeds.
- the blowing device according to the invention can be operated with compressed air which is provided continuously but in a timed manner, in which case a valve which can be controlled in time is accordingly to be arranged between the compressed air supply and the blowing device.
- the blowing device according to the invention essentially consists of two parts, namely a base body 1 and an air-permeable plate 2 having a microporous structure.
- the base body 1 is designed as a cuboid block, for example made of aluminum.
- a recess 3 designed corresponding to its shape and its dimensions is incorporated on a side surface for flush insertion of the plate 2.
- a trough-shaped chamber 4 is additionally milled into the bottom surface of the depression 3 of the base body 1. Via a bore 5 in the base body and a compressed air supply 6 attached above it, the chamber 4 can be acted upon with compressed air when the plate 2 is inserted into the recess 3 of the base body 1 (FIG. 2). Due to the microporous structure of the plate 2, it is permeable to air, so that the compressed air in the chamber 4 can flow out over the entire surface of the plate 2.
- the size of the air outlet openings of the plate 2 (microporous structure) is in the range below 1/10 mm.
- the base body 1 of the blowing device with the plate 2 is mounted in the area of the upper sheet 7 of a sheet stack 8 such that several sheets 7 can be loosened by the compressed air flowing out of the sheet.
- the base body 1 is preferably parallel with its longest side arranged to the edge of the sheet 7.
- the uniform air outlet from the plate 2 results in a very uniform disturbance and thus a trouble-free loosening of the upper sheets 7 of the sheet stack 8.
- the blowing device according to the invention can have a possibly large expansion and in particular the base body 1 can be in the form of a cuboid rod over a longer area of the edges of the arches 7 pass. Because of the resistance mentioned when the air exits through the plate 2, there is therefore no substantial inhomogeneity in the air outlet flow.
- the base body 1 with a correspondingly rectangular plate 2 is only an example, but represents a particularly advantageous embodiment of the blowing device according to the invention.
- the base body 1 can also have a circular or elliptical surface in which a correspondingly designed plate 2 is to be let in.
- the blowing device according to the invention is particularly advantageous when the base body 1 is movably attached to a frame-fixed suspension and, for example, the plate 2 is always kept at a minimum but still contact-free distance from the edges of the sheets 7 of the sheet stack 8 via a controllable actuator.
- optoelectronic scanning means could be provided which detect the distance between the plate 2 and the edges of the sheet stack 8, and the distance between the plate 2 and the edges of the sheet stack 8 can then be regulated to an intended value by means of a control provided.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sheets, Magazines, And Separation Thereof (AREA)
- Pile Receivers (AREA)
Abstract
Description
Die Erfindung betrifft eine Blasvorrichtung zum Lockern der oberen Bogen eines Bogenstapels gemäß dem Oberbegriff von Anspruch 1.The invention relates to a blowing device for loosening the upper sheets of a sheet stack according to the preamble of
Bei den meisten bogenverarbeitenden Maschinen, insbesondere bei bogenverarbeitenden Druckmaschinen, wird jeweils der oberste Bogen eines Bogenstapels entnommen und dann der dem Bogenstapel folgenden Verarbeitungsstufe zugeführt. Bei Bogendruckmaschinen erfolgt das Abnehmen des obersten Bogens zumeist mit Hub- und Schleppsaugern, die mittels Unterdruck diesen obersten Bogen erfassen. Um jeweils nur den obersten Bogen vom Bogenstapel zu entnehmen, ist es wichtig, daß die oberen Bogen des Bogenstapels vorgelockert sind, in dem Sinne, daß diese gerade in den Kantenbereichen nicht mehr zusammenhängen. Insbesondere nach dem Schneiden der Bogen mittels stumpfem oder schadhaftem Werkzeug kann dies der Fall sein. Zum Lockern der oberen Bogen eines Bogenstapels werden häufig Blasvorrichtungen eingesetzt, die über eine oder eine Mehrzahl von Luftaustrittsdüsen verfügen und somit einen oder mehrere Luftstrahle in den Kantenbereich der oberen Bogen einbringen.In most sheet-processing machines, in particular in sheet-processing printing machines, the top sheet of a sheet stack is removed in each case and then fed to the processing stage following the sheet stack. In sheet-fed printing machines, the uppermost sheet is usually removed using lifting and dragging suction devices, which use vacuum to grasp this uppermost sheet. In order to remove only the top sheet from the sheet stack, it is important that the top sheets of the sheet stack are pre-loosened, in the sense that they are no longer connected precisely in the edge areas. This can be the case, in particular, after cutting the sheets using a blunt or damaged tool. To loosen the upper sheets of a stack of sheets, blowing devices are often used which have one or a plurality of air outlet nozzles and thus introduce one or more air jets into the edge region of the upper sheets.
Blasvorrichtungen der oben kurz umrissenen Art sind beispielsweise aus der EP 0 364 737 A2 sowie der DE 2 906 873 A1 bekannt. Die Blasvorrichtung der EP 0 364 737 A2 weist eine luftstromerzeugende Einrichtung in Form eines Lüfters auf und ist seitlich neben dem Bogenstapel sowohl in der Höhe als auch in der Breite verstellbar und zusätzlich in der Blasleistung regulierbar angeordnet. Durch insbesondere die Regulierung der Blasleistung aber auch durch die verstellbare Anbringung ist eine individuelle Blasluftzufuhr gemäß den vorliegenden Verhältnissen zu erzielen.Blowing devices of the type briefly outlined above are known, for example, from EP 0 364 737 A2 and DE 2 906 873 A1. The blowing device of EP 0 364 737 A2 has an airflow-generating device in the form of a fan and can be adjusted laterally next to the sheet stack, both in height and in width, and is additionally adjustable in the blowing capacity. In particular, by regulating the blowing power but also by the adjustable attachment, an individual blowing air supply is in accordance with to achieve the present conditions.
Die Blasvorrichtungen gemäß der DE 2 906 873 A1 sieht nicht nur eine sondern mehrere in einer Fläche angeordnete Luftaustrittsöffnungen vor, mittels der eine Vielzahl einzelner Luftstrahle jeweils auf die oberen Bogen eines Bogenstapels einwirken. Da in einer Fläche mehrere Luftaustrittsöffnungen vorgesehen sind, kann bei entsprechender Ausbildung eine größere Fläche im oberen Bereich des Bogenstapels angeblasen werden als dies beispielsweise bei einer Einrichtung gemäß der erstgenannten Schrift der Fall ist.The blowing devices according to DE 2 906 873 A1 provide not only one but a plurality of air outlet openings arranged in one surface, by means of which a large number of individual air jets each act on the upper sheets of a sheet stack. Since several air outlet openings are provided in one area, a larger area in the upper region of the sheet stack can be blown with a corresponding design than is the case, for example, with a device according to the first-mentioned document.
Allgemein bekannt ist, daß zum Lockern bei dünneren Bedruckstoffen eine andere Blasluftleistung einzustellen ist als bei stärkeren Bedruckstoffen. Im allgemeinen reicht bei dünnen Bedruckstoffen ein geringerer Blasluftstrom aus. Nachteilig bei den bekannten Blasvorrichtungen ist aber, daß ein oder mehrere relativ scharf gebündelte und somit eine hohe Strömungsgeschwindigkeit aufweisende Luftstrahle direkt auf die Kantenbereiche des Bogenstapels einwirken und somit insbesondere ein Flattern und nicht das eigentlich beabsichtigte Trennen der Bogen in dem Kantenbereich verursachen. Versucht man nun eine derartig unvollständige Lockerung der oberen Bogen mit einem Verstärken des Blasluftstromes (Steigerung der Blasleistung) entgegen zu wirken, so wird meist nur ein Verstärken des Flatterns des oder der oberen Bogen bewirkt. Das Flattern eines Bogens wird dabei durch die spitzwinkelige bzw. nahezu parallele Umströmung der Bogenkante durch die Blasluft sowie Wirbelbildung erzeugt. Gerade ein Schwingen oder Flattern des obersten abzunehmenden Bogens eines Bogenstapels kann somit zu einer Störung der Bogenerfassung (fehlerhaftes Ansaugen) führen.It is generally known that a different blowing air capacity must be set for loosening with thinner substrates than with thick substrates. In general, a lower blowing air flow is sufficient for thin substrates. A disadvantage of the known blowing devices, however, is that one or more air jets, which are bundled relatively sharply and thus have a high flow velocity, act directly on the edge areas of the sheet stack and thus, in particular, cause fluttering and not the intended separation of the sheets in the edge area. If one now tries to counteract such an incomplete loosening of the upper bends by increasing the blown air flow (increasing the blowing power), then usually only an increase in the flutter of the upper bend (s) is achieved. The flutter of an arch is generated by the acute-angled or almost parallel flow around the edge of the arch through the blowing air and the formation of eddies. Swinging or fluttering of the uppermost sheet to be removed from a sheet stack can thus lead to a malfunction in sheet detection (incorrect suction).
Aufgabe der vorliegenden Erfindung ist es somit eine Blasvorrichtung gemäß dem Oberbegriff von Anspruch 1 derartig zu erweitern, daß bei bautechnisch einfacher Ausführung sowohl eine gute Lockerung erzielbar ist und insbesondere ein Störungen verursachendes Schwingen des obersten Bogens vermieden werden kann.The object of the present invention is therefore to expand a blowing device according to the preamble of
Gelöst wird diese Aufgabe durch die kennzeichnenden Merkmale von Anspruch 1. Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen.This object is achieved by the characterizing features of
Nach der Erfindung ist es vorgesehen, daß die die Luftaustrittsöffnungen aufweisende Fläche als eine Platte mit einer mikroporösen und somit insgesamt luftdurchlässigen Struktur ausgebildet ist. Eine derartige Platte kann beispielsweise durch Versintern von kugelförmigen, körnigen oder fadenförmigen Partikeln entstanden sein, wobei diese Partikel aus Metall, Mineralfasern oder Kunststoff bestehen. Ein Ausgangsprodukt, welches für die Herstellung einer Platte bei der erfindungsgemäßen Blasvorrichtung verwendet werden kann, ist unter dem Handelsnamen "Siperm" bekannt.According to the invention, it is provided that the surface having the air outlet openings is designed as a plate with a microporous and thus overall air-permeable structure. Such a plate can be created, for example, by sintering spherical, granular or thread-like particles, these particles consisting of metal, mineral fibers or plastic. A starting product which can be used for the production of a plate in the blowing device according to the invention is known under the trade name "Siperm".
Da nach der Erfindung vorgesehen ist, daß die Vielzahl von Luftaustrittsöffnungen durch die mikroporöse Struktur einer Platte gebildet sind, durch welche Druckluft ausgeblasen wird, entsteht zwar im mikroskopischen eine turbulente im makroskopischen - bezogen auf die Abmessungen der Blasvorrichtung also - eine insgesamt laminare Eigenschaften aufweisende Strömung. Die Druckluft tritt mehr oder weniger gleichförmig über die gesamte Fläche der Platte aus.Since it is provided according to the invention that the plurality of air outlet openings are formed by the microporous structure of a plate, through which compressed air is blown out, a turbulent flow in the macroscopic - that is, based on the dimensions of the blowing device - results in an overall laminar flow . The compressed air emerges more or less uniformly over the entire surface of the plate.
Eine nach dem Stand der Technik ausgebildete Blasvorrichtung mit einer mehrere in Form von Bohrungen ausgeführten Luftaustrittsöffnungen innerhalb einer Fläche erzeugt somit mehrere Luftstrahle, bei den sehr steile Geschwindigkeitsübergänge zwischen den Inneren und dem Bereich außerhalb der einzelnen Luftstrahle existieren. Blasluft, die derartig gerichtet und zu dem noch im spitzen Winkel oder parallel auf die Kante eines Bogens trifft, erzeugt aufgrund von Verwirbelungen ein Schwingen der Bogen. Haften zwei Bogen im Bereich ihrer stumpf oder ausgefranst geschnitten Kanten zusammen, so erzeugt ein relativ scharf gebündelter Luftstrahl oft nur ein Niederdrücken eines derartigen Paares, so daß ein Trennen dieser Bogen aufgrund der Blasluft nicht erfolgt.A blowing device designed according to the prior art with a plurality of air outlet openings in the form of bores within a surface thus generates a plurality of air jets in which there are very steep speed transitions between the interior and the area outside the individual air jets. Blown air, which is directed in this way and still meets the edge of a sheet at an acute angle or parallel, causes the sheets to vibrate due to turbulence. If two sheets stick together in the area of their blunt or frayed cut edges, a relatively sharply focused air jet often only depresses such a pair, so that these sheets are not separated due to the blowing air.
Dieser Effekt wird durch die erfindungsgemäße Blasvorrichtung dadurch vermieden, da die Blasluft durch eine Platte mit mikroporöser Struktur strömt und somit über diese Fläche gleichmäßig in den Bereich der Kanten der zu lockerenden Bogen eindringt. Im Bereich einer derartig gestalteten Luftaustrittsfläche ergibt sich eine "Spülwirkung" durch die austretende Druckluft. Die Luftgeschwindigkeit ist insgesamt geringer und wirkt über einen größeren Bereich auf die Kante jeweils eines Bogens ein, so daß ein Schwingen nicht entstehen kann. Auch ein Niederdrücken von im Kantenbereich zusammenhängender Bogen aus dem Strömungsbereich der Luft wird durch die erfindungsgemäße Blasvorrichtung vermieden.This effect is avoided by the blowing device according to the invention because the blowing air flows through a plate with a microporous structure and thus penetrates uniformly over this surface into the area of the edges of the sheets to be loosened. In the area of an air outlet surface designed in this way there is a "flushing effect" by the escaping compressed air. The air speed is lower overall and acts over a larger area on the edge of each sheet, so that swinging cannot occur. The blowing device according to the invention also prevents pressing of arcs connected in the edge region from the flow region of the air.
Die erfindungsgemäße Blasvorrichtung ist vorzugsweise an dem Anlegerstapel einer bogenverarbeitenden Druckmaschine mehrfach vorgesehen und beispielsweise den Kanten der Formatlänge und/oder an den Kanten der Formatbreite des Bogenstapels angeordnet. Durch eine einstellbare Aufhängung kann die erfindungsgemäß vorgesehene Luftaustrittsplatte in einen möglichst geringen Abstand zu den Kanten des Bogenstapels gebracht werden. Dabei ergibt sich eine optimale Lockerungswirkung der erfindungsgemäßen Blasvorrichtung.The blowing device according to the invention is preferably provided multiple times on the feeder stack of a sheet-processing printing press and is arranged, for example, on the edges of the format length and / or on the edges of the format width of the sheet stack. The air outlet plate provided according to the invention can be brought as close as possible to the edges of the sheet stack by means of an adjustable suspension. This results in an optimal loosening effect of the blowing device according to the invention.
Die erfindungsgemäße Blasvorrichtung kann zusätzlich mit nach dem Stand der Technik aufgebauten Bläsern zusammenwirken, so daß dann bei geringeren Luftstrahlgeschwindigkeiten auch große Formate getrennt werden können.
Die erfindungsgemäße Blasvorrichtung kann mit kontinuierlich aber auch zeitlich getaktet bereitgestellter Druckluft betrieben werden, wobei dann dementsprechend zwischen Druckluftversorgung und Blasvorrichtung ein zeitlich steuerbares Ventil anzuordnen ist.The blowing device according to the invention can additionally cooperate with blowers constructed according to the prior art, so that even large formats can then be separated at lower air jet speeds.
The blowing device according to the invention can be operated with compressed air which is provided continuously but in a timed manner, in which case a valve which can be controlled in time is accordingly to be arranged between the compressed air supply and the blowing device.
Des weiteren erfolgt die Erläuterung eines Ausführungsbeispiels der Erfindung anhand der Zeichnungen.Furthermore, an embodiment of the invention is explained with reference to the drawings.
Es zeigt:
- Fig. 1
- eine zerlegte Blasvorrichtung nach der Erfindung in perspektivischer Ansicht,
- Fig. 2
- einen Schnitt durch eine erfindungsgemäße Blasvorrichtung im Bereich der oberen Bogen eines Bogenstapels.
- Fig. 1
- a disassembled blowing device according to the invention in perspective view,
- Fig. 2
- a section through a blowing device according to the invention in the region of the upper sheet of a sheet stack.
Gemäß Fig. 1 besteht die erfindungsgemäße Blasvorrichtung im wesentlichen aus zwei Teilen, nämlich einem Grundkörper 1 und einer luftdurchlässigen, eine mikroporöse Struktur aufweisenden Platte 2. In diesem Ausführungsbeispiel ist der Grundkörper 1 als ein quaderförmiger Block beispielsweise aus Aluminium ausgeführt. In diesen quaderförmigen Grundkörper 1 ist an einer Seitenfläche zum bündigen Einlassen der Platte 2 eine entspechend deren Form und deren Abmessungen gestaltete Vertiefung 3 eingearbeitet.1, the blowing device according to the invention essentially consists of two parts, namely a
In die Bodenfläche der Vertiefung 3 des Grundkörpers 1 ist zusätzlich eine wannenförmige Kammer 4 eingefräst. Über eine Bohrung 5 im Grundkörper sowie eine darüber angebrachte Druckluftversorgung 6 ist die Kammer 4 bei in die Vertiefung 3 des Grundkörpers 1 eingelegter Platte 2 mit Druckluft beaufschlagbar (Fig. 2). Aufgrund der mikroporösen Struktur der Platte 2 ist diese luftdurchlässig, so daß die Druckluft in der Kammer 4 über die gesamte Fläche der Platte 2 ausströmen kann. Die Größe der Luftaustrittsöffnungen der Platte 2 (mikroporöse Struktur) liegt im Bereich unter 1/10 mm.A trough-
Gemäß Fig. 2 ist der Grundkörper 1 der Blasvorrichtung mit der Platte 2 im Bereich der oberen Bogen 7 eines Bogenstapels 8 derartig angebracht, so daß durch die aus der Platte ausströmende Druckluft mehrere Bogen 7 vorgelockert werden können. Bei der Ausbildung des Grundkörpers 1 als quaderförmiger Block ist dazu vorzugsweise der Grundkörper 1 mit seiner längsten Seite parallel zur Kante der Bogen 7 angeordnet.2, the
Wie durch die Pfeile in Fig. 2 angedeutet, ergibt der gleichmäßige Luftaustritt aus der Platte 2 eine sehr gleichmäßige Störmung und somit eine störungsfreie Lockerung der oberen Bogen 7 des Bogenstapels 8.As indicated by the arrows in FIG. 2, the uniform air outlet from the
Da bei dem Durchtritt von Druckluft durch die mikroporöse Struktur der Platte 2 ein bestimmter Strömungswiderstand zu überwinden ist, kann die erfindungsgemäße Blasvorrichtung eine evtl. große Ausdehnung aufweisen und insbesondere kann der Grundkörper 1 in Form eines quaderförmigen Stabes über einen längeren Bereich der Kanten der Bogen 7 reichen. Wegen des erwähnten Widerstandes beim Luftaustritt durch die Platte 2 ergibt sich somit keine wesentliche Inhomogenität der Luftaustrittsströmung.Since a certain flow resistance has to be overcome when compressed air passes through the microporous structure of the
Die bisher beschriebene rechteckige- bzw. quaderförmige Ausbildung des Grundkörpers 1 mit einer entsprechend rechteckig gestalteten Platte 2 sei nur beispielhaft, stellt aber eine besonders vorteilhafte Ausgestaltung der erfindungsgemäße Blasvorrichtung dar. Selbstverständlich kann der Grundkörper 1 auch eine kreis- oder ellipsenförmige Fläche aufweisen, in welche eine entsprechend gestaltete Platte 2 einzulassen ist.The previously described rectangular or cuboid design of the
Besonders vorteilhaft gestaltet sich die erfindungsgemäße Blasvorrichtung dann, wenn der Grundkörper 1 beweglich an einer gestellfesten Aufhängung angebracht ist und beispielsweise über einen steuerbaren Stellantrieb die Platte 2 immer in einem geringstmöglichen aber noch berührungsfreien Abstand zu den Kanten der Bogen 7 des Bogenstapels 8 gehalten wird. Es könnten beispielsweise optoelektronische Abtastmittel vorgesehen sein, die den Abstand der Platte 2 zu den Kanten des Bogenstapels 8 erfassen und über eine vorgesehene Steuerung kann sodann der Abstand der Platte 2 zu den Kanten des Bogenstapels 8 auf einen vorgesehenen Wert geregelt werden.The blowing device according to the invention is particularly advantageous when the
- 11
- GrundkörperBasic body
- 22nd
- Platteplate
- 33rd
- Vertiefungdeepening
- 44th
- Kammerchamber
- 55
- Bohrungdrilling
- 66
- DruckluftversorgungCompressed air supply
- 77
- Bogenarc
- 88th
- BogenstapelSheet stack
Claims (6)
dadurch gekennzeichnet,
daß die eine Vielzahl von Öffnungen aufweisende Fläche durch eine aufgrund einer mikroporösen Struktur luftdurchlässigen Platte (2) gebildet ist.Blowing device for loosening the upper sheets of a sheet stack, in particular for the feeder stack of a sheet-processing printing machine, with a surface facing the sheet edges of the stack and having a plurality of openings for the discharge of compressed air,
characterized by
that the surface having a plurality of openings is formed by a plate (2) which is air-permeable due to a microporous structure.
dadurch gekennzeichnet,
daß ein Grundkörper (1) vorgesehen ist, der eine durch die Platte (2) abgeschlossene Kammer (4) aufweist, die über wenigstens eine Bohrung (5) im Grundkörper (1) mit Druckluft beaufschlagbar ist.Blower device according to claim 1,
characterized by
that a base body (1) is provided which has a chamber (4) which is closed off by the plate (2) and can be acted upon by compressed air via at least one bore (5) in the base body (1).
dadurch gekennzeichnet,
daß der Grundkörper (1) als ein quaderförmiger Block ausgebildet ist.Blower device according to claim 2,
characterized by
that the base body (1) is designed as a cuboid block.
dadurch gekennzeichnet,
daß eine rechteckig gestaltete Platte (2) in eine Vertiefung (3) einer Seitenfläche des Grundkörpers (1) eingelassen ist.Blower device according to claim 3,
characterized by
that a rectangular plate (2) is embedded in a recess (3) in a side face of the base body (1).
dadurch gekennzeichnet,
daß die Platte (2) eine poröse Struktur aufgrund von miteinander versinterten Partikeln aufweist.Blowing device according to one of the preceding claims,
characterized by
that the plate (2) has a porous structure due to sintered particles.
dadurch gekennzeichnet,
daß die Platte (2) mit dem Grundkörper (1) der Blasvorrichtung über einen Stellantrieb beweglich gegenüber den Kanten der Bögen (7) des Bogenstapels (8) aufgehängt ist und daß eine Abtastvorrichtung vorgesehen ist, vermittels der der Abstand der Platte (2) zu den Kanten der Bogen (7) erfaßbar ist, woraufhin über eine Steuereinrichtung dieser Abstand auf einen vorgesehenen Wert regelbar ist.Blowing device according to one of the preceding claims,
characterized by
that the plate (2) with the base body (1) of the blowing device is movably suspended with respect to the edges of the sheets (7) of the sheet stack (8) by means of an actuator and that a scanning device is provided by means of which the distance of the plate (2) increases the edges of the sheets (7) can be detected, whereupon this distance can be regulated to a predetermined value via a control device.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4227409 | 1992-08-19 | ||
| DE4227409A DE4227409C1 (en) | 1992-08-19 | 1992-08-19 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0583662A1 true EP0583662A1 (en) | 1994-02-23 |
| EP0583662B1 EP0583662B1 (en) | 1994-12-14 |
Family
ID=6465859
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP93112122A Expired - Lifetime EP0583662B1 (en) | 1992-08-19 | 1993-07-29 | Blowing device for loosening the upper sheets of a sheet pile |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0583662B1 (en) |
| AT (1) | ATE115510T1 (en) |
| DE (2) | DE4227409C1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE202010003303U1 (en) | 2010-03-09 | 2010-07-01 | Manroland Ag | Blasting nozzle, in particular for assisting the separation of sheets from a stack of sheets |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2906873A1 (en) * | 1979-02-22 | 1980-09-04 | Mabeg Maschinenbau Gmbh Nachf | Sheet stack loosening device - includes blower head fitted with several blowers swivelling into operating position and directed towards top of sheet stack |
| US4306684A (en) * | 1979-12-04 | 1981-12-22 | American Can Company | Low noise air nozzle |
| US4570918A (en) * | 1984-11-19 | 1986-02-18 | Xerox Corporation | Feeder and bottom stacker |
| EP0364737A2 (en) * | 1988-10-10 | 1990-04-25 | Heidelberger Druckmaschinen Aktiengesellschaft | Blowing device for loosening sheets in the feeders of rotary printing machines |
-
1992
- 1992-08-19 DE DE4227409A patent/DE4227409C1/de not_active Expired - Fee Related
-
1993
- 1993-07-29 DE DE59300040T patent/DE59300040D1/en not_active Expired - Fee Related
- 1993-07-29 AT AT93112122T patent/ATE115510T1/en not_active IP Right Cessation
- 1993-07-29 EP EP93112122A patent/EP0583662B1/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2906873A1 (en) * | 1979-02-22 | 1980-09-04 | Mabeg Maschinenbau Gmbh Nachf | Sheet stack loosening device - includes blower head fitted with several blowers swivelling into operating position and directed towards top of sheet stack |
| US4306684A (en) * | 1979-12-04 | 1981-12-22 | American Can Company | Low noise air nozzle |
| US4570918A (en) * | 1984-11-19 | 1986-02-18 | Xerox Corporation | Feeder and bottom stacker |
| EP0364737A2 (en) * | 1988-10-10 | 1990-04-25 | Heidelberger Druckmaschinen Aktiengesellschaft | Blowing device for loosening sheets in the feeders of rotary printing machines |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0583662B1 (en) | 1994-12-14 |
| DE4227409C1 (en) | 1993-08-19 |
| ATE115510T1 (en) | 1994-12-15 |
| DE59300040D1 (en) | 1995-01-26 |
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