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
  • B65H29/00—Delivering or advancing articles from machines; Advancing articles to or into piles
  • B65H29/52—Stationary guides or smoothers
• • 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
  • B65H2301/40—Type of handling process
  • B65H2301/44—Moving, forwarding, guiding material
  • B65H2301/446—Assisting moving, forwarding or guiding of material
  • B65H2301/4461—Assisting moving, forwarding or guiding of material by blowing air towards handled material
• • 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
• • 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
• • 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
  • B65H2406/113—Details of the part distributing the air cushion

Definitions

• the invention relates to a device for the floating guiding of web or sheets aterially 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.
• DE 28 02 610 AI shows nozzles, the side surfaces of which run parallel to the oblique guide surface and with a lowered one Tongue are provided. These nozzles are arranged close to each other on the blow box and a guide surface is described which consists of several blow boxes and is arranged above and below the sheet material to be guided. In a further development, the nozzles are assigned a perforation which, as an additional blowing agent, is intended to prevent the processing material from touching the blowing box (guide surface).
• the device has nozzles with a nozzle body, each of which is countersunk in the nozzle body and inclined to the outside of the nozzle body in the direction of the guide surface and has a guide surface for the emerging blast air flow.
• the nozzle body has a conical depression within the guide surface, in which at least one nozzle opening is arranged eccentrically.
• a guide device for freshly printed sheets which should be guided over a sheet guide surface without touching it.
• the sheet guiding surface has blowing openings distributed over the sheet guiding the sheet guiding plate of the sheet guiding surface. These blow openings are by at least two types of
• the nozzles of the first type sweep the sheets by means of an air jet bundle oriented in the direction of sheet travel and the nozzles of the second type sweep the sheets by means of swirl flows generated.
• color deposits on endangered sections of the sheet guiding surface are to be avoided by the nozzles generating the air flow.
• the nozzles generating swirl flows are complex to manufacture and there is a risk of lubrication in the nozzle center due to the negative pressure present there.
• the swirl flow of the nozzle gives rise to a high level of turbulence, which leads to disquieting of the bow. This has a particularly negative effect on sheets with a low basis weight or on slack sheet material.
• 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 the floating guiding of web or sheet material along a guide surface and noticeably reduces the amount of lubrication.
• 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, which operate according to the aerodynamic paradox, after which the web or Bo ⁇ enmaterial ⁇ leichzeiti ⁇ ⁇ etra ⁇ en (over- pressure area) and sucked in (negative pressure area).
• This guide surface is closed per se and, according to a predetermined distribution, has a plurality of incorporated nozzles which are designed as air-loaded (preferably identical) nozzles.
• a first advantage of the invention is based on the fact that - starting from a large number of nozzles in the guide surface - around a blow opening known per se (first blow opening) - in the rear region of each nozzle, a flat depression beneath the guide surface deepens to the level of the guide surface is arranged.
• the planar depression is (in plan view) preferably in the form of a circle or ellipse and has at least one second blowing opening arranged in the rear part. At the second blowing opening or possibly a further (third) blowing opening, blowing flows emerge in the rear area from the nozzle, the blowing force of which is always lower than the blowing force at the first blowing opening.
• the first blowing opening creates the main blowing flow and the second blowing opening arranged in the rear area and, if necessary, the third blowing opening form secondary blowing flows.
• the main and secondary blowing flows of a nozzle are always directed differently in order to achieve the broadest possible support effect of the web or sheet material. With the lowest possible vacuum areas, each nozzle thus has a main and at least one secondary blowing jet component.
• the first and the second and, if applicable, the third blow opening can be arranged symmetrically or asymmetrically below the depression in each nozzle. Each blowing opening itself is additionally lowered from the level of the guide surface.
• each nozzle has a subsequent, diverging guide surface with lateral flanks at each blowing opening, which m directly m the guide surface or m countersink and from this indirectly m the guide surface.
• each guide surface is trapezoidal, trumpet-shaped, or preferably elliptical or trough-shaped.
• each nozzle supports the above-mentioned divergence of the guide surfaces by means of several blowing openings per nozzle.
• a known blow opening and at least one second blow opening are arranged on each nozzle.
• a third blow opening and possibly one or more additional blow openings are assigned to each nozzle.
• the blown air is supplied to the blower openings of each nozzle from a flow channel, preferably a blower box, which is functionally connected to a pneumatic system and is corresponding to the number of blown-off valves. distributed.
• the first blowing opening always creates the main blowing flow.
• support openings are arranged laterally to the flanks of each nozzle in the guide surface of the device. These support openings, for example small bores, can be blown with air (from the flow channel) and cause a direct flow impulse against the underside of the web or sheet material. This provides additional support for web or sheet material, particularly in the area of the side flanks, so that floating guidance can be achieved without greasing at vulnerable points.
• the planar depression is formed with at least one support opening, for example a bore.
• the support opening is preferably arranged centrally in the flat depression. The support opening is fed with blown air via the flow channel and the blown air escaping causes a flow pulse and is against the
• the device according to the invention with the nozzles can be produced by a single forming tool with relatively little effort.
• Show: 1 shows a section (AA) through the device in the region of a nozzle in the longitudinal direction
• FIG. 2 is a plan view of the nozzle of FIG. 1,
• FIG. 3 shows a section (B-B) through the device in the area in front of the blow opening of the nozzle according to FIG. 1,
• Fig. 4 is a three-dimensional representation of the
• Fig. 5 shows a first development of a nozzle
• Fig. 6 shows a second development of a nozzle
• the device for the floating guiding of web or sheet material 3 has a closed guide surface 2, which extends along a conveying path in the conveying direction 11 of the web or sheet material 3. A large number of nozzles 1 are introduced into this guide surface 2 according to a specific distribution.
• An existing nozzle 1 is preferred by means of a forming tool through a straight or curved punch cut (transverse to the planned blowing direction) with a straight or curved first (cut) edge 17 and at least one second (cut) edge 18 in the area a first and a second blowing opening 6, 7 and by deep drawing (lowering the material from the plane of the guide surface 2) per nozzle 1.
• a third (cut) edge 19 for a third blow opening 8 can be realized with the forming tool.
• the blowing openings 6, 7, 8 protrude into a flow channel 5 coupled to a pneumatic system, for example a blow box.
• Such a nozzle 1 has a rear area 12 and a front area 13, the areas 12, 13 being delimited by the edge 17 of the first blowing opening 6 (main blowing opening).
• a flat depression 14 Arranged in the rear area 12 of the nozzle 1 is a flat depression 14, which is recessed parallel to the guide surface 2 and ends at the edge 17.
• the depression 14 delimited by the edge 17 preferably merges in a defined radius into the plane of the elevated guide surface 2.
• planar depression 14 When viewed in plan view, the planar depression 14 is preferably arranged in a circle (FIG. 2) or in an ellipse.
• the first blowing opening 6 is arranged below the edge 17.
• a recessed guide surface 4 begins, which preferably diverges at a defined angle into the plane of the guide surface 2.
• the guide surface 4 is further delimited by a first flank 9 and a second flank 10.
• the flanks 9, 10 are closed side surfaces and extend flat or curved from the guide surface 4 into the plane of the higher guide surface 2.
• the depression 14 has the second edge 18 and preferably the third edge 19, the depression 14 ending at the edges 18, 19.
• the edges 18, 19 in the rear area 12 are arranged facing away from the first edge 17.
• the blowing openings 7, 8 are arranged, at each of which a recessed guide surface 4 begins, which at a defined angle m the plane of the guide surface 2 preferably ends divergently.
• Each guide surface 4 is in turn delimited by a first edge 9 and a second edge 10.
• the flanks 9, 10 are closed side surfaces and run flat or curved from the guide surface 4 into the plane of the higher arranged guide surface 2.
• each nozzle 1 (with two or three blow openings 6-8) includes (Fig. 5).
• Fig. 5 A possible smearing of the web or sheet material 3 can thus also be avoided.
• each nozzle 1 m on the plane of the guide surface 2 has a circumferential rounding 21 and the guide surfaces 4 of the nozzle 1 merge with the rounding 21.
• Blow openings 7, 8 in the rear area 12 are secondary blow openings. All blowing air flows exiting the blowing openings 6, 7, 8 have the same pressure.
• the blowing air flows emerging at the blowing openings 7,8 (secondary blowing openings) have a small air volume.
• the blowing air flow emerging at the blowing opening 6 main blowing opening
• the blowing openings 6, 7, 8 and thus their blowing flows are arranged differently from one another in order to create the largest possible area for the floating guide.
• At least one blowing flow is directed in the conveying direction 11 and another blowing flow is directed against the conveying direction 11.
• the arrangement of the blowing openings 6, 7 and possibly 8 is asymmetrical, but preferably symmetrical, taking into account areas 12, 13.
• the blowing flow (main blowing flow) emerging at the first blowing opening 6 is directed with the largest air volume with one component against the conveying direction 11 and at least one component of the blowing air flow of the second blowing opening 7 (and possibly the blowing air flow of the third blowing opening 8) is in the conveying direction 11 of the web or sheet material 3 directed.
• blowing flows directed transversely to the conveying direction 11 can also be realized.
• a component of the blowing air flow of the first blowing opening 6 is directed transversely to the conveying direction 11 of the web or sheet material 3 and a component of the blowing air flow of at least the second blowing opening 7 is directed transversely to the conveying direction 11 of the sheet or sheet material 3.
• a pressure build-up which acts over a large width is achieved between the guide surface 2 and the underside of the web or sheet material 3.
• Such nozzles 1 can be acted upon, for example, with a pressure of approximately 50 to 500 Pa with a gaseous medium.
• a gaseous medium For example, air can be used as the gaseous medium, which is introduced into this flow channel 5 by a pneumatic system, preferably at least one fan, in a flow channel 5 arranged on the rear side of the guide surface 2.
• the nozzle opening 16 is preferably arranged centrally in the depression 14.
• Each nozzle 1 has in the circular sector between two blowing openings (first and second blowing openings 6, 7 and / or second and third blowing openings 7, 8 and / or first and third blowing openings 6, 8) each has at least one nozzle opening 16 fed with blowing air, which also includes the flow channel is 5 m functional connection.
• At least one support opening 16 m of the guide surface 2 is arranged on each side of the flanks 9, 10 and is supplied with blown air by means of the pneumatic system and flow channel 5.
• These support openings are preferably arranged 16 m near the blow openings 6, 7, 8, since the greatest negative pressure is present in the area of the blow openings 6, 7, 8.
• the outlet area of such a nozzle opening 16 is ⁇ the outlet surfaces of the individual blow openings 7, 8.
• the sum ⁇ of the outlet surfaces of the nozzle bores 16 is ⁇ (smaller) than the sum ⁇ of the outlet openings of the blow openings 6-8.
• a nozzle 1 with at least two blowing openings 6, 7 (according to FIG.
• each nozzle 1 has a recess 20, which is arranged in the guide surface 2 and surrounds each nozzle 1.
• Each recess 20 is arranged recessed to the level of the guide surface 2. A possible smearing of the web or sheet material 3 can thus also be avoided.
• Each nozzle 1 thus has a circumferential recess 20, which is arranged lower than the plane of the guide surface 2, and the guide surfaces 4 of each nozzle 1 merge into the recess 20.
• the guiding surfaces 4 merge into the flanks 9, 10 in a trough-shaped manner.
• the guide surfaces 4 are preferably elliptical (FIG. 4, 5).
• the flanks 9, 10 merge into the plane of the guide surface 2 by means of circumferential rounding 21 (FIG. 5) or circumferential countersink 21 (FIG. 4).
• nozzles 1 with circumferential rounding 21 or circumferential countersink 21 is not limited to the designs according to FIGS. 4 and 5. Rather, this arrangement can also be used in an embodiment of the nozzle 1 according to FIG. 6. [REFERENCE LIST]

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Advancing Webs (AREA)
• Treatment Of Fiber Materials (AREA)
• Nozzles (AREA)
• Delivering By Means Of Belts And Rollers (AREA)
• Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
• Cleaning In General (AREA)
• Pressure Welding/Diffusion-Bonding (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=7668677

Family Applications (1)

Country Status (7)

Families Citing this family (2)

Family Cites Families (8)

• 2000
  • 2000-12-22 DE DE10064588A patent/DE10064588B4/de not_active Expired - Fee Related
• 2001
  • 2001-12-06 JP JP2002552838A patent/JP3739748B2/ja not_active Expired - Fee Related
  • 2001-12-06 CN CNB01821195XA patent/CN1267329C/zh not_active Expired - Fee Related
  • 2001-12-06 DE DE50105860T patent/DE50105860D1/de not_active Expired - Lifetime
  • 2001-12-06 EP EP01271995A patent/EP1345834B1/fr not_active Expired - Lifetime
  • 2001-12-06 CZ CZ20031724A patent/CZ20031724A3/cs unknown
  • 2001-12-06 WO PCT/EP2001/014310 patent/WO2002051731A1/fr active IP Right Grant
  • 2001-12-06 AT AT01271995T patent/ATE292592T1/de active

Non-Patent Citations (1)

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