EP0583662B1 - Blasvorrichtung zum Lockern der oberen Bogen eines Bogenstapels - Google Patents

Blasvorrichtung zum Lockern der oberen Bogen eines Bogenstapels Download PDF

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Publication number
EP0583662B1
EP0583662B1 EP93112122A EP93112122A EP0583662B1 EP 0583662 B1 EP0583662 B1 EP 0583662B1 EP 93112122 A EP93112122 A EP 93112122A EP 93112122 A EP93112122 A EP 93112122A EP 0583662 B1 EP0583662 B1 EP 0583662B1
Authority
EP
European Patent Office
Prior art keywords
blowing device
plate
sheet
base body
air
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP93112122A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0583662A1 (de
Inventor
Nikola Pupic
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.)
Manroland AG
Original Assignee
MAN Roland Druckmaschinen AG
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 MAN Roland Druckmaschinen AG filed Critical MAN Roland Druckmaschinen AG
Publication of EP0583662A1 publication Critical patent/EP0583662A1/de
Application granted granted Critical
Publication of EP0583662B1 publication Critical patent/EP0583662B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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, which corresponds to the preamble of claim 1.
  • 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 flow 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
  • Pile Receivers (AREA)
EP93112122A 1992-08-19 1993-07-29 Blasvorrichtung zum Lockern der oberen Bogen eines Bogenstapels Expired - Lifetime EP0583662B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4227409A DE4227409C1 (enrdf_load_stackoverflow) 1992-08-19 1992-08-19
DE4227409 1992-08-19

Publications (2)

Publication Number Publication Date
EP0583662A1 EP0583662A1 (de) 1994-02-23
EP0583662B1 true EP0583662B1 (de) 1994-12-14

Family

ID=6465859

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93112122A Expired - Lifetime EP0583662B1 (de) 1992-08-19 1993-07-29 Blasvorrichtung zum Lockern der oberen Bogen eines Bogenstapels

Country Status (3)

Country Link
EP (1) EP0583662B1 (enrdf_load_stackoverflow)
AT (1) ATE115510T1 (enrdf_load_stackoverflow)
DE (2) DE4227409C1 (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202010003303U1 (de) 2010-03-09 2010-07-01 Manroland Ag Strahldüse, insbesondere zur Unterstützung der Trennung von Bogen von einem Bogenstapel

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2906873A1 (de) * 1979-02-22 1980-09-04 Mabeg Maschinenbau Gmbh Nachf Vorrichtung zum vorlockern der oberen bogen eines bogenstapels
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
DE3834400A1 (de) * 1988-10-10 1990-04-19 Heidelberger Druckmasch Ag Lockerungsblaeser fuer bogenanleger von bogenrotationsdruckmaschinen

Also Published As

Publication number Publication date
EP0583662A1 (de) 1994-02-23
DE59300040D1 (de) 1995-01-26
DE4227409C1 (enrdf_load_stackoverflow) 1993-08-19
ATE115510T1 (de) 1994-12-15

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