DE10064531A1 - Device for the floating guiding of web or sheet material in a processing machine - Google Patents

Abstract

The invention relates to a device for the suspended transport of strip or sheet material in a processing machine. The aim of the invention is the production of such a device with, in particular, an equally distributed pressure generation for the suspended transport of strip or sheet material along a guide surface with a significant reduction in the risk of crashing. Said aim is achieved, whereby the device comprises a closed, pneumatically supplied guide surface (13), functionally connected to at least one flow channel, coupled to a pneumatic system, a number of nozzles (23) with outlet openings and, adjacent thereto, guide surfaces set at an angle into the inner side of the flow channel. The guide surface (13) comprises a first guide zone (I) in the transport direction (12), in which the outlet openings for the nozzles (23), at the beginning of the guide surface (13), are directed against the transport direction (12) of the strip or sheet material. A second guide zone (II) is arranged after the first guide zone (I), in which the nozzles change orientation with regard to the outlet direction thereof to point towards the side edges (25) and a third guide zone (III) is arranged after the second guide zone (II) in which the nozzles (23) are arranged with the outlets thereof at right angles to the direction of transport (12), in the direction of both side edges (25).

Description

The invention relates to a device for floating Guiding web or sheet material in a processing machine machine according to the preamble of claim 1.

This device is particularly suitable for non-contact sheet guiding and sheet feeding in a printing press.

State of the art

A known device of this type is described in DE-OS 19 07 083 with a blow box with a guide surface and more ren distributed blowing openings, each one in the oblique guide surface lowered into the blow box sen. However, there the nozzles have a tongue and the radial edges of the guide surface close an angle between between 120 ° and 180 °. This will be a broad one Beam, not a directed beam, with a flat effect testifies. All blowing nozzles are also arranged in the same direction net. As a result, it can only be a hardly tightening in one direction Effect can be achieved, especially with thin sheet material lien is disadvantageous because it makes it easy to flutter tend.

DE 28 02 610 A1 shows nozzles, the side surfaces of which sloping guide surface parallel and with lowered Tongue are provided. These nozzles are close together Blow boxes arranged and there is a guide surface be wrote, which consists of several blow boxes and above and arranged below the substrate to be guided are. In a further development, the nozzles are perforated assigned which as an additional blowing agent the touch of the processing material with the blow box (guide surface che) should prevent.

According to DE 44 06 847 A1 is a device for floating Guide web or sheet material along a conveyor line  in a conveying direction with a plurality of in one Guide surface incorporated nozzles known. About their The guide surface is wide in at least three zones divides, a symmetrical symmetry to the axis of symmetry zone with nozzles blowing against the conveying direction and two adjoining the stabilization zone, the Tightening zones delimiting the guide surface. Thereby form the Nozzles extending longitudinally and transversely to the conveying direction Nozzle rows. The nozzles blow in the side tightening zones against the conveying direction and away from the axis of symmetry, the nozzles alternating with the blowing directions Include angles from 100 ° to 120 ° and 160 ° to 170 °.

EP 0 695 707 A2 describes a device for non-contact en Guide sheet material known. The facility points a guide surface with air-blowing nozzles, which when the Arch material forming, common flow pattern by a first speed component in the conveying direction of the sheet material as well as a second and a third Speed component in the direction of the respective sides edges is formed.

For nozzle types according to DE 19 07 083, DE 28 02 610 it is disadvantageous that the web or sheet material in the area of strongest negative pressure at the nozzle openings and the edges of the nozzles or the cut edges or can touch the tongue-shaped portions. This danger exists especially in the case of light or limp web or sheet materials. As a result, undesirable exits occur lubrication effects on the material and / or the guide surface and / or markings on the material itself. With the before directions according to DE 44 06 847 and EP 0 695 707 exist especially when processing sheet material, especially in the Transfer areas an increased risk of greasing.

Object of the invention

The invention has for its object a device to create the kind mentioned at the beginning Avoids disadvantages, in particular an even one distributed pressure build-up for floating guiding of sheets or Permitted web material along a guide surface and the Lubrication risk noticeably reduced.

The task is characterized by the training features of claim 1 solved. Further training results from the dependent Claims.

The device for floating guidance is based on a guide surface on which the web or sheet material in one Direction of conveyance along non-contact by means of an air pole ters is performed. The air cushion is fed by nozzles, who work according to the aerodynamic paradox, according to which Web or sheet material worn at the same time (overpressure offers) and is sucked in (negative pressure area). The management area che is closed in itself and points to a given Distribution of a variety of incorporated nozzles, which as Air-actuated, preferably structurally identical, nozzles formed are. When forming the device with the following Ver division there is a stable flutter-free levitation of the web or sheet material contact-free to the guide surface on.

A first advantage is based on the fact that - related on a single guide surface - the alignment of the nozzles with their blow openings (blasmaul) at the beginning of the guide surface with a component against the conveying direction of the web or sheet material is arranged and then in För the direction continuously to both side edges (the Guide surface) is arranged to be continuous. Through this alignment  of the blowing openings of the nozzles become blowing air flow gene generated, which - based on that in the conveying direction line of symmetry on the guide surface - starting from one Alignment essentially mirrored against the conveying direction figuratively symmetrically fanned out into an orientation outside towards the side edges of the guide surface transversely (approximately at right angles) to the conveying direction are. With such an arrangement, the inclination thus decreases of the blow openings of the nozzles in the conveying direction until these are directed sideways to the conveying direction.

Another advantage is that at least over the maximum format width of the web or sheet material itself extending guide surface in the conveying direction of the web or Three guide zones I to III (per guide surface che). A single guide surface is part of it Lig or modular from several parts. A derar term guide surface is with at least one with at least a pneumatic system coupled flow channel in functi onsverbindung. From one or more flow channels / Flow channels will blow air to the blow openings of everyone Nozzle fed and through the blow holes to form the Air cushion distributed.

It is also advantageous that I to III the nozzles preferably with different nozzle densities (Number of nozzles per unit area) on a single one Guide surface are arranged. The in the conveying direction of the Guiding zone I and the Subordinate leadership zone III preferably have a larger one Nozzle density (number of nozzles per unit area) than the one between the two guide zones I and III Leadership zone II.

The larger nozzle density is preferably always in the ends  Areas (start area: leadership zone I or end area rich: leadership zone III) of a leadership area. Especially when processing sheet material respective management zone I or III transfer areas, at for example of two bow holding systems, adjacent to one another net, because of a higher nozzle density, a stronger air upholstery can be achieved and thus the risk of smearing is noticeable is reduced.

In an advantageous development, the guide surface in guide zone I, compared to guide surface III, the greater nozzle density. Thus, for example, disturbances Avoidance in the guidance of the web or sheet material bar, which by upstream institutions, for example a transfer area.

It is also advantageous that they have such a blow opening with the aligned nozzles emerging from the blow openings the blown air flows always between (free of nozzles) 7 areas (of the closed guide surface) two in front Blow in the nozzles. The air flow is preferred a downstream nozzle in the middle of the free space of two adjacent upstream nozzles directed. That’s all Areas of the guide surface evenly with blown air supply and there is an even pressure build-up construction for the floating guidance of the web or sheet material over the entire management area.

Examples

The invention will be explained in more detail using an exemplary embodiment be tert. The following schematically show:

Fig. 1 is a sheet-fed rotary printing press in series construction with means for the suspended guidance of sheet material,

Fig. 2 shows a device for guiding radians TERIAL in association with a Bogenfüh approximately cylindrical,

FIGS. 3 to 8 are developed a guide surface with various nozzle assemblies,

FIGS. 9 and 10 special nozzle formations.

A sheet-fed rotary printing machine according to Fig. 1, at the pitch of a plurality of printing units 1, and a coating unit 8, which are arranged in the conveying direction of the sheet material 12 in series. 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 . An inking unit and possibly a dampening unit are assigned to each plate cylinder 2 . The coating unit 8 has a metering system 7 which is functionally connected to a forme cylinder 6 . The forme cylinder 6 is in turn associated with a sheet guiding cylinder. 4 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 guide cylinders 4 , 5 and the conveyor systems 14 have sheet-holding systems, preferably gripper systems, arranged on the circumference for the sheet transport.

The sheet guiding cylinders 5, designed as transfer cylinders or reversing drums, and the conveyor systems 14 are assigned several stationary sheet guiding devices 11, forming a continuous guide surface 13, for contactlessly guiding sheet material at a defined distance from the sheet guide cylinder 5 or the conveyor systems 14 .

A single guide surface 13 in the conveying direction 12 is limited by a first transfer area 10 and a second transfer area 10 , for example sheet holding systems of the sheet guide cylinders 4 , 5 , when assigned to a sheet guide cylinder 5 . Alternatively, a single guide surface 13 in the conveying direction 12 is limited 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 arm 9 .

According to Fig. 2 a device for suspended guidance of which is shown, for example, sheet material, which at one Bogenfüh approximately cylinder 5, specifically a transfer cylinder, each with upstream and downstream sheet guide cylinder 4, Europe, particularly a printing cylinder, is to be explained in more detail.

Between the sheet guide cylinder 5 and the upstream sheet guide cylinder 4 and between the sheet guide cylinder 5 and the downstream sheet guide cylinder 4 , the transfer area 10 of two sheet holding systems is arranged in the respective tangent point. In such a transfer area 10 , the sheet material is transferred from a sheet holding system to a second sheet holding system. In the conveying direction 12 of the sheet material, 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 .

In the present example, 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 actuated first flow channel and has a part of the guide surface 13 with nozzles 23 for the discharge of blown air according to the blowing, suction or venturi principle (aerodynamic paradox). Each sheet guide device 11 is for this purpose a first pneumatic system 15, preferably associated with at least one fan, which is 11 in Funktionsver connection with the first flow passage of the sheet guide device and realizes the air supply of the sheet guiding device. 11 Each sheet guiding device 11 is arranged below the sheet guide cylinder at a defined distance from its circumference in order to ensure a non-contacting sheet guide.

In a preferred embodiment, 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 .

In a preferred development, a second flow channel 20 is arranged below the arc guide device 11 (first flow channel) and is functionally connected to the second pneumatic system 19 . The second pneumatic system 19 is net angeord on the back of the second flow channel 20 and supplies the flow channel 20 with air through 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 several, over the maximum format width, outflow openings 21 for the blown air, which are directed toward the transition region 10 against the underside of the sheet in the sheet outlet 17 .

Analogous to the arch exit 17 , the arch emergence 18 is also mirror-image to the symmetry axis 22 below the downstream transfer area 10 , 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 generated the underside of the sheet in the direction of the transfer area 10 . 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 disposed at the back of the second Strö mung channel 20 and supplied via an opening to the flow passage 20 with air, so that at a discharge opening 21 current flow of a low blowing pressure and high volume, which is substantially in the direction of the transfer region 10 and thus is directed towards the underside of the sheet. The second flow channel 20 has at least one, preferably more than the maximum format width outflow opening 21 for the blowing air, which are directed towards the transfer area 10 against the underside of the sheet in the sheet passage 18 .

In FIGS. 3 to 8 are shown a closed-end transactions per se guide surface 13 and the nozzles 23 are distributed over the width and over the length of the guide surface 13 in conveying direction (12).

In the conveying direction 12 (along the guide surface 13 ), each guide surface 13 has a first guide zone I in which the blow openings 24 (blasmaul) below the plane of the guide surface 13 of the nozzles 23 at the beginning of the guide surface 13 with 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 . It is particularly advantageous in the first row against the conveying direction 12 or obliquely to the conveying direction 12 arrangement of the blowing openings 24 in order to avoid Renmie.

It follows the first guide zone I in the conveying direction 12, a second guide zone II, are arranged merging into the blow openings 24 of the nozzles 23 of directed substantially counter to the conveying direction 12 of blowing openings 24 in both sides ge to the side edges 25 directed blowing openings 24th With respect to the line of symmetry 26 , the blowing openings 24 are arranged in front of each other as a mirror image. In the guide zone II, the nozzles 23 are preferably arranged on curved paths 27 spaced apart from one another, of which at least one intersection lies on the line of symmetry 26 . The intersection is preferably directed against the conveying direction 12 .

Finally, the second guide zone II in the direction of conveyance 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 .

With the arrangement of the nozzles 23 on the guide surface 13, in particular in the range sondere the guide zones II and III takes for each nozzle row, the inclination of the nozzles 23, starting from an arrangement approximately opposite to the conveying direction 12 towards an arrangement transverse to the conveying direction 12, by a DEFINE amount.

If nozzles 23 are arranged on the line of symmetry 26 , these are predominantly arranged with the blowing openings 24 against the conveying direction 12 .

In a preferred form, the guide surface 13 in the conveying direction 12 in the first and the third guide zone I, III each have a greater nozzle density and in the intermediately located second guide zone II a lower nozzle density. The nozzle density in the conveying direction 12 and transversely to the conveying direction 12 can be made variable. In particular, in one of the guide surface 13 arranged upstream of the transfer region 13 has the guide surface 10 in the first guide zone I at the greatest nozzle density. As a result, a reinforced air cushion can be achieved in the guide zone I, which supports the sheet material during the lubrication-free entry into the sheet outlet 17 .

The arrangement of the nozzles 23 goes continuously from the guidance zone I to the guidance zone III.

Preferably, based on a symmetrical line 26 in the conveying direction 12, all nozzles 23 with blowing openings 24 on the guide surface 13 are arranged in mirror image from the guide zone I to the guide zone III.

Within a guide surface 13 , the guide zone II is preferably of greatest length in the conveying direction 12 of the sheet material.

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 Blasström flow of the downstream nozzle 23 is preferably directed centrally into the free space of the two upstream nozzles 23 .

At least in the guide zone II, the nozzles 23 , which are arranged in a mirror image to the line of symmetry 26 , extend on curved paths 27 spaced apart from one another. At least one intersection of the tracks 27 arranged in mirror image lies on the line of symmetry 26 . The intersection of two webs 27 is preferably directed against the conveying direction 12 .

The design of the device for floating guiding of web or sheet material is not limited to at least one sheet guide device 11 with a guide surface 13 . Rather, a plurality of sheet guiding devices 11 which can be acted upon pneumatically and coupled to a plurality of flow channels can also be carried out in modular form as a guide surface 13 .

Furthermore, the guide surface 13 is not limited to an assignment to at least one sheet guide cylinder 5 . In addition, 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.

In Fig. 9, a nozzle 23 is shown disposed a recessed in the rear region to the guide surface 13, has scale reduction 28 which terminates at an edge 29 and merges into the guide surface 13. Arranged below the edge 29 are a first blowing opening 24.1 and a second blowing opening 24.2 , which are effective as separate blowing openings 24 through a vertical separation point 30 . To the blowing openings 24.1, 24.2 merging into an inclined guide surface 13 guide surface 31, which closed by edges 32, 33 than laterally, che in the Führungsflä 13 via continuous side surfaces are formed to close.

In Fig. 10, a nozzle 23 is shown, which has in the rear region a recessed to the guide surface 13 arranged, planar lowering 28, which terminates 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 . In the present example, the depression 28 has a third edge 35 . Below the first edge 29 there is a blow opening 24 for the front area (greatest blowing force) and below the second and third edges 34 , 35 there is a blow opening 36 (for the edge 34 ) and a blow opening (not visible) for the Edge 35 arranged. To the blowing openings 24, 36 and the blowing opening is not visible on the edge 35 located close to inclined in the guide surface 13 passing over guide surfaces 31, which are bounded by edges 32, 33 as laterally closed lateral surfaces.

LIST OF REFERENCE NUMBERS

1

printing unit

2

plate cylinder

3

Blanket cylinder

4

Sheet guiding cylinder

5

Sheet guiding cylinder

6

form cylinder

7

dosing

8th

coating unit

9

boom

10

Transfer area

11

Sheet guiding device (first flow channel)

12

conveying direction

13

guide surface

14

conveyor system

15

first pneumatic system

16

comb plate

17

arch finish

18

sheet ascent

19

second pneumatic system

20

second flow channel

22

axis of symmetry

23

jet

24

blowing opening

25

margin

26

line of symmetry

27

train

28

lowering

29

edge

30

separation point

31

baffle

32

flank

33

flank

34

edge

35

edge

36

blowing opening
I first management zone
II second management zone
III third management zone

Claims (10)

1. Device for the floating guiding of web or sheet material in a processing machine, in particular a printing press in the conveying direction along a closed guide surface, the guide surface being functionally connected to at least one flow channel coupled to a pneumatic system and the guide surface being a plurality of nozzles with at least blowing openings and adjacent guiding surfaces which are inclined obliquely into the inner side of the flow duct, characterized in that
that the nozzles ( 23 ) are distributed over the width of the guide surface ( 13 ) and longitudinally in the conveying direction ( 12 ), that the guide surface ( 13 ) in the conveying direction ( 12 ) has a first guide zone (I) in which the blowing openings ( 24 ) the nozzles ( 23 ) at the start of the guide surface ( 13 ) are directed with a component against the conveying direction ( 12 ) of the web or sheet material,
that the first guide zone (I) in the conveying direction ( 12 ) is followed by a second guide zone (II) in which the nozzles ( 23 ) with blowing openings ( 24 ) - starting from an arrangement directed essentially against the conveying direction ( 12 ) - in a ge on the side edges ( 25 ) directed arrangement and
that the second guide zone (II) in the conveying direction ( 12 ) is followed by a third guide zone (III) in which the nozzles ( 23 ) with blowing openings ( 24 ) are essentially perpendicular to the conveying direction ( 12 ) in the direction of the side edges ( 25 ) of the guide surface ( 13 ) are arranged. 2. Device according to claim 1, characterized in that the nozzles (23) on the guide surface (13) at each nozzle row a, starting from an arrangement approximately opposite the conveying direction (12) towards an arrangement transverse to the conveying direction (12) have a defined inclination to be taken. 3. Device according to at least claim 1, characterized in that the nozzles ( 23 ) in the guide zones (I-III) are arranged such that the blowing flow of a nachgeordne th nozzle ( 23 ) in the free space of two upstream, adjacent nozzles ( 23rd ) is directed. 4. The device according to at least claim 1, characterized in that in the conveying direction ( 12 ), the guide surface ( 13 ) in the first and the third guide zone (I, III) each has a greater nozzle density and in the intermediate lying arranged second guide zone (II ) has a lower nozzle density. 5. The device according to at least claim 1, characterized in that the guide surface ( 13 ) in the first guide zone (I) has the greatest nozzle density. 6. The device according to at least claim 1, characterized in that the arrangement of the nozzles ( 23 ) from the guide zone (I) to the guide zone (III) merges continuously. 7. The device according to at least claim 1, characterized in that - with respect to a symmetry line ( 26 ) extending in the conveying direction ( 12 ) - the nozzles ( 23 ) with blowing openings ( 24 ) on the guide surface ( 13 ) mirror image of the guide zone (I ) are arranged up to the guiding zone (III). 8. The device according to at least claim 1, characterized in that the guide zone (II) is largest within the guide surface ( 13 ) in the conveying direction ( 12 ). 9. The device according to at least claim 1, characterized in that at least in the guide zone (II) the nozzles ( 23 ) are preferably arranged on curved tracks ( 27 ), where at least one respective intersection of the tracks ( 27 ) on the line of symmetry ( 26 ) lies. 10. The device according to at least claims 1 and 9, characterized in that the intersections of the tracks ( 27 ) are directed against the conveying direction ( 12 ).