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
  • B65H23/00—Registering, tensioning, smoothing or guiding webs
  • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
  • B65H23/24—Registering, tensioning, smoothing or guiding webs longitudinally by fluid action, e.g. to retard the running web
• • 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
  • B65H5/228—Feeding articles separated from piles; Feeding articles to machines by air-blast or suction device by air-blast devices
• • 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
  • B65H2406/10—Means using fluid made only for exhausting gaseous medium
  • B65H2406/11—Means using fluid made only for exhausting gaseous medium producing fluidised bed
  • B65H2406/112—Means using fluid made only for exhausting gaseous medium producing fluidised bed for handling material along preferably rectilinear path, e.g. nozzle bed for web

Definitions

• the invention relates to a device for the floating guidance of web or sheet material in a processing machine according to the preamble of claim 1.
• This device is particularly suitable for contactless sheet guidance and sheet conveying in a printing press.
• a known device of this type is described in DE-OS 19 07 083 with a blow box with a guide surface and a plurality of distributed blow openings, each of which has an inclined guide surface which is lowered into the blow box.
• the nozzles have a tongue and the radial edges of the guide surface form an angle between 120 ° and 180 ° ' . This creates a wide beam, not a directed beam, with a flat effect. All blowing nozzles are also arranged in the same direction. As a result, a hardly tightening effect can be achieved in only one direction, which is disadvantageous especially in the case of thin sheet materials, since they tend to flutter.
• DE 28 02 610 AI shows nozzles, the side surfaces of which run parallel to the oblique guide surface and are provided with a tongue. These nozzles are arranged closely next to one another on blow boxes and a guide surface is described which consists of several blow boxes and is arranged above and below the printing material to be guided. In one development, the nozzles are assigned a perforation which, as an additional blowing agent, is intended to prevent the processing material from coming into contact with the blow box (guide surface).
• a device for the suspended guiding of web or sheet material along a conveying path in a conveying direction with a plurality of nozzles incorporated in a guide surface is known.
• the width of the guide surface is divided into at least three zones, a stabilization zone lying symmetrically to the axis of symmetry with nozzles blowing against the conveying direction and two tightening zones adjoining the stabilization zone and delimiting the guide surface.
• the nozzles form rows of nozzles extending longitudinally and transversely to the conveying direction. In the side tightening zones, the nozzles blow against the conveying direction and away from the axis of symmetry, the nozzles alternating with the blowing directions forming an angle of 100 ° to 120 ° and 160 ° to 170 °.
• a device for the contact-free guiding of sheet material has a guide surface with air-blowing nozzles, the common flow pattern of which is formed when the sheet material is guided by a first speed component in the conveying direction of the sheet material and by a second and a third speed component in the direction of the respective side edges.
• nozzle types according to DE 19 07 083, DE 28 02 610 it is disadvantageous that the web or sheet material is strongly sucked in at the nozzle openings in the region of the strongest negative pressure and can touch the edges of the nozzles or the cut edges or the tongue-shaped sections. This danger exists particularly in the case of light or limp web or sheet materials.
• the invention has for its object to provide a device of the type mentioned, which avoids the disadvantages mentioned, which in particular allows an evenly distributed pressure build-up for floating guiding of sheet or web material along a guide surface and noticeably reduces the risk of smearing.
• the device for floating guiding starts from a guiding surface on which the web or sheet material is guided in a conveying direction without contact by means of an air cushion.
• the air cushion is fed by nozzles that work according to the aerodynamic paradox, after which the web or sheet material is carried simultaneously (overpressure area) and sucked in (underpressure area).
• the guide surface is closed per se and, according to a predetermined distribution, has a large number of incorporated nozzles, which as Air-loaded, preferably identical, nozzles are formed.
• a first advantage is based on the fact that - with respect to a single guide surface - the alignment of the nozzles with their blowing openings (blasmaul) is arranged at the beginning of the guide surface with a component against the conveying direction of the web or sheet material and then continuously in the conveying direction to both side edges (the Guide surface) is arranged to be continuous.
• This orientation of the blowing openings of the nozzles generates blowing air flows which - based on the line of symmetry of the guide surface running in the conveying direction - fanned out symmetrically in a mirror-symmetrical manner starting from an orientation essentially counter to the conveying direction, in an outward direction in the direction of both side edges of the guide surface and transversely (approximately at right angles) to the conveying direction.
• the inclination of the blowing openings of the nozzles increases in the conveying direction until they are directed laterally to the conveying direction.
• the guide surface which extends at least over the maximum format width of the web or sheet material, has three guide zones I to III (per guide surface) in the conveying direction of the web or sheet material.
• a single guide surface can be made in one piece or modularly from several parts.
• Such a guide surface is functionally connected to at least one flow channel coupled to at least one pneumatic system. Blown air is blown from one or more flow channels to each of the blow openings Nozzle fed and distributed through the blow holes to form the air cushion.
• the nozzles are preferably arranged with a different nozzle density (number of nozzles per unit area) on a single guide surface.
• the guide zone I upstream in the conveying direction of the web or sheet material and the downstream guide zone III preferably have a greater nozzle density (number of nozzles per unit area) than the guide zone II arranged between the two guide zones I and III.
• the greater nozzle density is preferably always arranged in the end areas (start area: guide zone I or end area: guide zone III) of a guide surface.
• start area guide zone I or end area: guide zone III
• guide zone III guide zone III
• the respective guide zones I and III are assigned adjacent transfer areas, for example of two sheet holding systems, since a greater air density can be achieved by a greater nozzle density and the risk of smearing is thus noticeably reduced.
• the guide surface in the guide zone I has the greater nozzle density compared to the guide surface III.
• the nozzles oriented in this way with their blowing openings always blow in between (areas free of nozzles) areas (the closed guide surface) of two upstream nozzles with blowing air flows emerging from the blowing openings.
• the air flow is preferred a downstream nozzle directed in the center of the free space of two neighboring upstream nozzles. This means that all areas of the guide surface can be supplied evenly with blown air flows and a uniform pressure build-up is formed for the floating guidance of the web or sheet material over the entire guide surface.
• Fig. 1 a sheet rotary printing machine in
• FIG. 2 shows a device for guiding sheet material in association with a sheet guiding cylinder
• a sheet-fed rotary printing machine consists, for example, of a plurality of printing units 1 and a coating unit 8, which are arranged in series in the direction of conveyance 12 of the sheet material.
• the coating unit 8 is followed in the conveying direction 12 by a cantilever 9 with a circulating conveyor system 14 which transports the sheet material in the gripper closure onto a cantilever stack and deposits it there.
• Each printing unit 1 consists of a plate cylinder 2, a blanket cylinder 3 and a sheet guiding cylinder 4.
• Each plate cylinder 2 is assigned an inking unit and, if necessary, a dampening unit.
• the coating unit 8 has a metering system 7 which is functionally connected to a forme cylinder 6.
• a sheet guiding cylinder 4 is in turn assigned to the forme cylinder 6. Between the printing units 1 and the last printing unit 1 and the coating unit 8, sheet guiding cylinders 5 are arranged, which are designed here as transfer drums and / or reversing drums.
• the sheet guiding cylinders 4, 5 and the conveyor systems 14 have sheet holding systems, preferably gripper systems, arranged on the start side for the sheet transport.
• the sheet guiding cylinders 5, which are designed as transfer cylinders or reversing drums, and the conveyor systems 14 are assigned a plurality of fixed sheet guiding devices 11, forming a continuous guide surface 13, for contactlessly guiding sheet material at a defined distance from the sheet guiding cylinder 5 or the conveyor systems 14.
• a single guide face 13 in the conveying direction 12 is delimited by a first transfer area 10, for example a sheet holding system of the sheet guiding cylinder 4 and a sheet holding system of the conveying system 14, and a sheet braking device arranged in the delivery 9.
• sheet material is shown, which is to be explained in more detail on a sheet guiding cylinder 5, especially a transfer cylinder, each with a preceding and downstream sheet guiding cylinder 4, especially a printing cylinder.
• the transfer area 10 of two sheet holding systems is arranged in the respective tangent point.
• the sheet material is transferred from a sheet holding system to a second sheet holding system.
• the first transfer area 10 is followed by a sheet outlet 17 and in the conveying direction 12, the sheet exit 17 is followed by a sheet riser 18 with the subsequent second transfer area 10.
• two sheet guiding devices 11, based on an axis of symmetry 22, are arranged below the sheet-guiding cylinder 5 in a modular manner (mirror-to-butt assembly) and together form the uniform guide surface 13.
• Each sheet guiding device 11 is box-shaped as a pneumatically actuatable first flow channel and has a part of the guide surface 13 with nozzles 23 for the discharge of blown air according to the blown suction or venturi principle (aerodynamic paradox).
• each sheet guide device 11 is assigned a first pneumatic system 15, preferably at least one fan, which is functionally connected to the first flow channel of the sheet guide device 11 and which provides the air supply to the sheet guide device 11.
• Each sheet guide 11 is below the sheet guide cylinder at a defined distance from it Arranged circumferentially to ensure contact-free floating sheet guidance.
• the sheet guiding device 11 adjacent to the sheet outlet 17 has an upstream, first comb plate 16 pointing in the direction of the transfer area 10.
• the comb plate 16 mechanically or pneumatically supports the sheet guidance in the sheet outlet 17.
• a second flow channel 20 is arranged below the sheet guiding device 11 (first flow channel) and is functionally connected to the second pneumatic system 19.
• the second pneumatic system 19 is arranged on the rear side of the second flow channel 20 and supplies the flow channel 20 with air via an opening, so that a flow of lower blowing pressure and high volume flow emerges at an outflow opening 21.
• the second flow channel 20 has at least one, preferably a plurality of outflow openings 21 for the blown air which extend over the maximum format width and which are directed in the direction of the transfer region 10 against the underside of the sheet into the sheet outlet 17.
• a second, separately controllable pneumatic system 19 is also fixed to the frame, which is preferably formed by several fans and, analogous to the arch exit 17, a blowing air flow with low blowing pressure and high volume flow against the Bottom of the sheet in the direction of transfer area 10 generated.
• a second flow channel 20, which is functionally connected to the second pneumatic system 19, is arranged in the arch rise 18, analogously to the arch exit 17, below the arch guide 11.
• the second Pneumatic system 19 is arranged on the back of the second flow channel 20 and supplies the flow channel 20 with air via an opening, so that at an outflow opening 21 a flow of low blowing pressure and high volume flow, which is directed essentially towards the transfer area 10 and thus towards the underside of the sheet is leaving.
• the second flow channel 20 has at least one, preferably a plurality of outflow openings 21 for the blown air which extend over the maximum format width and which are directed in the direction of the transfer region 10 against the underside of the sheet and into the sheet emergence 18.
• 3 to 8 show developments of a guide surface 13 which is closed per se and the nozzles 23 are arranged distributed over the width and the length of the guide surface 13 (in the conveying direction 12).
• each guiding surface 13 has a first guiding zone I, in which the blowing openings 24 (blasmaul) of the nozzles 23 lying below the plane of the guiding surface 13 at the beginning of the guiding surface 13 have a component against the conveying direction 12 of the Sheet material are directed.
• the guide zone I is preferably formed by at least two rows of nozzles 23.
• An arrangement of the blowing openings 24 directed against the conveying direction 12 or obliquely to the conveying direction 12 is advantageous in particular in the first row in order to avoid lubrication.
• a second guide zone II in which the blowing openings 24 of the nozzles 23 are arranged from blowing openings 24 which are directed essentially against the conveying direction 12 into blowing openings 24 directed on both sides towards the side edges 25.
• the blowing openings 24 are preferably arranged in mirror image.
• the nozzles 23 are preferably arranged on curved, spaced-apart tracks 27, at least one intersection of which lies on the line of symmetry 26. The intersection is preferably directed against the conveying direction 12.
• the second guide zone II in the conveying direction 12 is followed by a third guide zone III in which the blowing openings 24 of the nozzles 23 are directed essentially at right angles (transversely) to the conveying direction 12 in the direction of both side edges 25 of the guide surface 13.
• This guide zone III is formed by at least two rows of nozzles 23.
• the inclination of the nozzles 23 for each row of nozzles increases by a defined amount, starting from an arrangement approximately against the conveying direction 12 to an arrangement transverse to the conveying direction 12 to.
• nozzles 23 are arranged on the line of symmetry 26, these are predominantly arranged with the blowing openings 24 against the conveying direction 12.
• the guide surface 13 has a greater nozzle density in the conveying direction 12 in the first and third guide zones I, III and a lower nozzle density in the second guide zone II arranged therebetween.
• the nozzle density in the conveying direction 12 and transversely to the conveying direction 12 can be made variable.
• the guide surface 13 has the greatest nozzle density in the first guide zone I. This is a Reinforced air cushion can be achieved in the guide zone I, which supports the sheet material in the smear-free entry into the sheet outlet 17.
• the arrangement of the nozzles 23 continues continuously from the guide zone I to the guide zone III.
• all nozzles 23 with blowing openings 24 on the guide surface 13 are preferably arranged in mirror image from the guide zone I to the guide zone III.
• the length of the guide zone II in the conveying direction 12 of the sheet material is preferably greatest within a guide surface 13.
• the nozzles 23 are preferably arranged in the guide zones I-III of a guide surface 13 such that the blowing flow of a downstream nozzle 23 is always directed into the free space (part of the closed guide surface 13) of two upstream neighboring nozzles 23.
• the blowing flow of the downstream nozzle 23 is preferably directed centrally into the free space of the two upstream nozzles 23.
• the nozzles 23 arranged in mirror image to the line of symmetry 26 extend on curved paths 27 spaced apart from one another. At least one intersection of the lines 27 arranged in mirror image lies on the line of symmetry 26. The intersection of two paths 27 against the conveying direction 12 is preferred directed.
• the design of the device for the floating guiding of web or sheet material is not limited to at least one sheet guiding device 11 with a guide surface 13. Rather, there are also several pneumatically actuated A plurality of flow channels coupled sheet guiding devices 11 in a modular design can be implemented as a guide surface 13.
• the guide surface 13 is not limited to an assignment to at least one sheet guide cylinder 5.
• a guide surface 13 can also be arranged in the delivery arm of a machine that processes sheet material. Such a guide surface 13 can also be used in machines processing web material, for example in a dryer section of a web printing machine.
• the nozzles 23 arranged on the guide surface 13 are preferably configurations according to FIGS. 9 and 10.
• FIG. 9 shows a nozzle 23 which, in the rear area, has a planar depression 28, which is recessed in relation to the guide surface 13 and ends at an edge 29 and merges into the guide surface 13.
• the blowing openings 24.1, 24.2 are adjoined by a guide surface 31 which slopes into the guide surface 13 and which are formed by flanks 32, 33 as laterally closed side surfaces which transition into the guide surface 13.
• FIG. 10 shows a nozzle 23 which, in the rear area, has a planar depression 28, which is recessed in relation to the guide surface 13 and ends at an edge 29 and merges into the guide surface 13.
• the depression 28 furthermore has at least one second edge 34 facing away from the first edge 29 and delimiting the depression 28.
• the depression 28 has a third edge 35.
• the blowing openings 24, 36 and the non-visible blowing opening on the edge 35 are adjoined at an angle by guiding surfaces 31, which are delimited by flanks 32, 33 as laterally closed side surfaces.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
• Advancing Webs (AREA)
• Delivering By Means Of Belts And Rollers (AREA)
• Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
• Chain Conveyers (AREA)
• Pressure Welding/Diffusion-Bonding (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=7668632

Family Applications (1)

Country Status (8)

Families Citing this family (10)

Family Cites Families (6)

• 2000
  • 2000-12-22 DE DE10064531A patent/DE10064531C2/de not_active Expired - Fee Related
• 2001
  • 2001-12-11 CZ CZ20031726A patent/CZ20031726A3/cs unknown
  • 2001-12-11 AU AU2002238417A patent/AU2002238417A1/en not_active Abandoned
  • 2001-12-11 AT AT01986860T patent/ATE320999T1/de active
  • 2001-12-11 DE DE50109322T patent/DE50109322D1/de not_active Expired - Lifetime
  • 2001-12-11 WO PCT/EP2001/014504 patent/WO2002051732A2/fr not_active Ceased
  • 2001-12-11 JP JP2002552839A patent/JP3703803B2/ja not_active Expired - Fee Related
  • 2001-12-11 CN CN01821193.3A patent/CN1258472C/zh not_active Expired - Fee Related
  • 2001-12-11 EP EP01986860A patent/EP1345835B1/fr not_active Expired - Lifetime

Non-Patent Citations (1)

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