EP1184315A2 - Curl-suppressing device for flat printed materials - Google Patents

Abstract

The smoothing device for printed sheets comprises curved guide surfaces (2.9.1, 2.9.2) over which the sheets flow. These have air outlets (11, 11') which connect with throttle channels (15, 16) fed with compressed air. An Independent claim is included for a sheet processing machine fitted with the device.

Description

The invention relates to a smoothing device for flat substrates, which under Forced guidance of a printing material edge leading in one running direction over Guide surface sections are drawn, which form a smoothing notch and at least have a passage communicating with a flow channel, which at operational flow causes pressure conditions on the substrate form a bead protruding into the smoothing notch, and one with the Printing machine equipped with a smoothing device.

A smoothing device of the type mentioned is for example from the publication DE 26 49 051 C2 known. When used as intended Smoothing device whose flow channel is connected to a vacuum generator, the a section of the instantaneous in the area of the smoothing notch Sucks printing material into the smoothing notch to form a bead. There are generally upstream and downstream downstream of the smoothing notch and guide sections as far as possible the guide surface sections forming the smoothing notch in contact with the substrate pulled over it, this contact in the area of Smoothing notch due to there on the substrate in the direction of the corresponding Force acting sections is particularly intimate and these forces are remarkable Cause friction on the substrate, which can lead to marks on the Printing material are generated.

The invention is based, so the smoothing device mentioned to design that substrates can be smoothed in this gentle way.

For this purpose, the smoothing device mentioned at the outset is according to the invention configured that the guide surface sections are provided with openings that with Throttle channels communicate, and that the throttle channels operate with compressed air are acted upon.

A smoothing device designed in this way unfolds the bead in addition to that a suction effect on the substrate that forms a support effect, which prevents contact of the Prevents printing material with guide surface sections that with the throttle channels communicating openings are provided. This supportive effect results from above also advantageous in that it unfolds at low volume flows and thus no flutter of the substrate is stimulated. In addition, the support effect also increases increasing convergence of the printing material to those provided with the openings Guide surface sections due to the decreasing volume flow of the throttled Flow, so that between these guide surface sections and the above pulled printing material forms a print that corresponds approximately to that with which the compressed air is fed into the throttle channels.

Advantageous refinements and developments are the attached drawings and the following detailed explanation of the invention which refers to this removable.

Fig. 1

eine schematische Darstellung eines einen Ausleger umfassenden Abschnittes einer mit der Glättvorrichtung ausgestatteten Bogen verarbeitenden Druckmaschine, wobei die Glättvorrichtung beispielhaft lediglich eine Glättungskerbe aufweist,

Fig. 2

einen in der Laufrichtung geführten Schnitt durch ein Ausführungsbeispiel der Glättvorrichtung, welche mittels Lamellen gebildete Drosselkanäle aufweist,

Fig. 3

einen Ausschnitt eines Drosselkanäle ausbildenden Lamellenpaketes mit einer beispielhaften Ausgestaltung von dessen Lamellen zur Bildung von zusammenhängenden Strömungskanalabschnitten mit vielfach wechselnder Durchströmungsrichtung,

Fig. 4

eine Explosionsdarstellung eines Lamellenpaketes gemäß einem weiteren Ausführungsbeispiel der Lamellen zur Bildung von zusammenhängenden Strömungskanalabschnitten mit vielfach wechselnder Durchströmungsrichtung,

Fig. 5

eine Explosionsdarstellung eines Ausführungsbeispiels, bei welchem ein Drosselkanal gebildet ist aus wenigstens einem mit Ein- und Austrittsöffnungen kommunizierenden Kanal und einem zwischen diesen wirksamen Filter,

Fig. 6

eine Explosionsdarstellung eines Ausführungsbeispieles mit einem zur Bildung des genannten Filters verwendeten textilen Einsatz,

Fig. 7

Alternative Ausgestaltungen des genannten Filters unter Verwendung

a) einer luftdurchlässigen kugelförmigen Schuttgutfüllung

b) einer luftdurchlässigen körnigen Schüttgutfüllung,

c) von Fasern

d) einer luftdurchlässigen Schwammstruktur

e) einer luftdurchlässigen Struktur gesinterten Materiales,

Fig. 8

eine der Fig. 2 entsprechende Schnittdarstellung einer alternativen Ausgestaltung von Drosselkanälen mittels eines Schuttgutes,

Fig. 9

eine der Fig. 2 entsprechende Schnittdarstellung einer alternativen Ausgestaltung von Drosselkanälen mittels eines formstabilen, einen der Leitflächenabschnitte und dessen Öffnungen ausbildenden Drosseleinsatzes, der im dargestellten Beispiel mittels einer luftdurchlässigen Struktur eines gesinterten Materiales gebildet ist,

Fig. 10

eine Glättvorrichtung mit zwei in der Laufrichtung des Bedruckstoffes aufeinanderfolgenden Glättungskerben in einer beispielhaften Ausgestaltung,

Fig. 11

einen Schnitt entlang der Linie XI in Fig. 10.

In the drawings:

Fig. 1

1 shows a schematic representation of a section comprising a delivery arm of a printing machine that is equipped with the smoothing device, the smoothing device having only one smoothing notch by way of example,

Fig. 2

3 shows a section in the running direction through an exemplary embodiment of the smoothing device which has throttle channels formed by means of lamellae,

Fig. 3

1 shows a section of a lamella package forming throttle channels with an exemplary configuration of its lamellae for forming coherent flow channel sections with a frequently changing flow direction,

Fig. 4

2 shows an exploded view of a plate pack according to a further exemplary embodiment of the plates to form coherent flow channel sections with a frequently changing flow direction,

Fig. 5

2 shows an exploded view of an exemplary embodiment in which a throttle channel is formed from at least one channel which communicates with inlet and outlet openings and a filter which acts between them.

Fig. 6

2 shows an exploded view of an exemplary embodiment with a textile insert used to form the filter mentioned,

Fig. 7

Alternative configurations of the filter mentioned using

a) an air-permeable spherical bulk filling

b) an air-permeable granular bulk filling,

c) of fibers

d) an air-permeable sponge structure

e) an air-permeable structure of sintered material,

Fig. 8

2 shows a sectional illustration corresponding to FIG. 2 of an alternative embodiment of throttle ducts by means of a bulk material,

Fig. 9

2 shows a sectional illustration corresponding to FIG. 2 of an alternative embodiment of throttle channels by means of a dimensionally stable throttle insert which forms one of the guide surface sections and its openings and which is formed in the example shown by means of an air-permeable structure of a sintered material,

Fig. 10

a smoothing device with two successive smoothing notches in the running direction of the printing material in an exemplary embodiment,

Fig. 11

a section along the line XI in Fig. 10th

The smoothing device is a component of one shown schematically in FIG last processing station 1 of a printing machine of the following delivery 2. The last Processing station can be a printing unit or a finishing unit, such as be a varnishing unit. In the present example it is an offset process working printing unit. The boom 2 adjoining this comprises gripper systems 2, 1, which of an operational circumferential, here with dash-dotted lines indicated chain conveyor 2.2 are worn. During one round of a respective gripper system 2.1, this takes over a printing material in the form of a sheet 3 of this leading printing cylinder 1.1 and transported it via a Sheet guiding device 2.3 to a sheet brake 2.4. This takes over sheet 3 below its release on the part of the gripper system 2.1, brakes it to a storage speed and in turn finally releases it, so that it can move at this speed while simultaneously lowering to the leading edge stops 2.5 and below Alignment with these and with these opposite rear edge stops 2.6 forms a stack 4 together with previous and / or subsequent sheets 3, which is carried by a hoist which lowers the stack 4 to the extent that whose height increases. Of the hoist, only one is the stack 4 in FIG. 1 load-bearing platform 2.7 and this load-bearing platform, indicated by dash-dotted lines Lift chains 2.8 reproduced.

At the sheet guiding device 2.3, one of the webs is guided over it Gripper systems 2.1 formed the following sheet guide surface 2.9, which is preferred for guiding sheet printed on both sides with nozzles not shown here for producing a Air cushions between the sheet guide surface 2.9 and the sheet 3 guided over it is equipped, wherein the nozzles are fed by an air supply system which in Fig. 1 is indicated by the nozzle 2.10.

In the sheet printed on both sides for guiding, it is preferably essentially continuous running sheet guiding surface 2.9 is a gap 2.11 in to use a smoothing device the sheet guide device 2.3 is provided, which can be closed by means of the smoothing device.

A respective sheet 3 guided by the printing cylinder 1.1 is by means of a gripper system 2.1 recorded in a gripping edge area that conforms to a direction of travel in accordance with Directional arrow 6 leading edge of the respective sheet 3 connects, and passes thus the boom 2 under positive guidance of this leading edge along a Smoothing device 5 including conveyor line, at the end of which the transfer of the sheet 3 to the sheet brake 2.4.

As can be seen from FIG. 2, the smoothing device comprises 5 guide surface sections 2.9.1 and 2.9.2, which form a smoothing notch 7, and at least one air passage opening 8, which communicates with a flow channel 9, which with a suction air connection 10 a vacuum generator, not shown, is connected. In the case of one Air passage opening 8 is preferably in the middle of the transverse to the direction of travel Direction arrow 6 present extent of the smoothing notch 7 is provided. Is preferred a plurality of air passage openings 8 are provided along the smoothing notch 7, that is to say in succession transversely to the running direction according to direction arrow 6 and one Form a row of openings, the extent of which is at least transverse to the direction of travel the present extent corresponds to the smallest processed sheet, while the In addition, a row of openings according to a further development explained later has corresponding extension, which is adapted to that of the largest processed sheets is.

The operationally flowed through at least one air passage direction 8 or from one A plurality of the same row of openings creates pressure conditions which exist on one respective arc 3 drawn over the guide surface sections 2.9.1 and 2.9.2 Form a bead protruding into the smoothing notch 7 (see FIG. 1).

The guide surface sections 2.9.1 and 2.9.2 are provided with openings 11 which are in the explained further course, pressurized with compressed air during operation Throttle channels communicate.

In the embodiment shown in FIG. 2, each with a compressed air connection 12 provided chambers 13, 14 provided with chamber wall sections 13 ', 14', which form a respective one of the guide surface sections 2.9.1 and 2.9.2. Within the Chambers 13 and 14 each lie on one of the openings 11 forming Chamber wall section 13 ', 14' a throttle insert 15 and the throttle channels 16, which in each case between the respective openings 11 and the respective Compressed air connection 12 is effective so that the throttle inserts 15 and 16 Throttle channels formed are operationally pressurized with compressed air, which then throttled flows out through the openings 11. To form the throttle channels are here slats combined to form a respective package are used, whereby a each of the packets forms one of the throttle inserts 15 and 16.

Fig. 3 shows an advantageous embodiment of throttle channels by means of a Lamella pack, which, however, is preferred for later use on others Location of the smoothing device, d. H. not assigned to the openings 11 is provided. This plate pack comprises first plates 17 which are at a distance from one another which lie opposite the thickness of a respective one between the first fins 17 arranged second lamella 18 corresponds. The first slats 17 form in Substantially full-surface joining surfaces, with which they are attached to between two of the first slats arranged second slat 18 abut. The respective second lamella 18 is broken through in such a way that it can be joined by means of the joining surfaces of the adjacent first Lamella 17 forms laterally closed continuous flow channel sections, that follow each other in a similar way to a meander. A respective end of the meander communicates with an edge section 17 'of one of the respective first slats 17, see above that overall throttle channels in the form of flow channel sections with multiple result in changing flow direction. That from the first and second slats 17 and 18 composite plate pack is operationally from first end faces of the slats starting in the direction of their opposite end faces flows through. Number and geometry of the fins 17 and 18 are given Adjusted requirements.

A corresponding adaptation also applies to that in FIG. 4 in an exploded view reproduced section of a plate pack, which is an alternative embodiment of flow channel sections with frequently changing flow directions and in a preferred embodiment for forming the throttle inserts 15, 16 according to FIG. 2 serves. Here again delimitation lamellae 19 and 19 'alternate and together with these connected flow channel sections with frequently changing Intermediate fins 20 forming the flow direction. The intermediate plates 20 are perforated in such a way that coherent, in the manner of a spiral with in This example shows rectilinear sections arranged column. In the Limiting slats 19 and 19 'recesses 21 and 21' are provided with communicate an outer or inner end of the "spiral".

The outer ends of the "spirals" communicate in the present example with aligned arranged recesses 21 - here in the form of holes - so that The lamella pack is operationally flowed through in the direction of its stratification. The Cutouts of the slats 19, 19 ', 20 are shown here as flat, for adaptation to a respective chamber wall section 13 ', 14', however, they are nestled against them.

With slight modifications of the configuration according to FIG. 4, one is also in the case 3 present flow direction for use elsewhere Smoothing device achievable, which will be discussed in the further course. This Changes include an alternating opposite training "spiral" and with a respective outer end communicating edge recesses of the Limiting slats 19 instead of the recesses 21 provided according to FIG. 4.

In order to achieve a sufficient throttling effect, the flow channel sections have in the embodiments according to FIGS. 3 and 4, a relatively small cross section relatively large total length of a "meander" or a "spiral" and the changes in the The flow direction of the same is as abrupt as possible.

In a further embodiment, throttle channels are made of at least one with inlet and Exits communicating channel and a between the exits and Effective filter inlet openings formed.

Fig. 5 shows an advantageous embodiment of such an embodiment, in the form of a Exploded view of a section of a plate pack, which in turn consists of Boundary fins 22 and 22 'and intermediate fins 23 inserted between them is composed. The limiting lamellae 22 and 22 'have the inputs and Exit openings 24 and 25. These communicate with channels in the form of Intermediate fins 23 provided and from the joining surfaces of the limiting fins 22 and 22 'covered, elongated openings 26 in the present example.

An effective between the outlet and inlet openings 25 and 24 is in the present example of an air permeable filling the opening 26 Insert 32 shown.

It goes without saying that the embodiment according to FIG. 5 already without the ones provided there Form filter throttle channels.

With the geometry of the limiting lamellae 22 and 22 '( and outlet openings 24 and 25 in the form of bores) is a corresponding one Lamella pack in the direction of its stratification flow so that at appropriate geometry and conforming to a chamber wall section 13 ', 14' Outflow openings of the upper limiting lamella 22 in FIG. 5 with the openings 11 these chamber wall sections 13 ', 14' communicate directly.

As can be seen from FIG. 6, those lying within the scope of the invention are limited Embodiments using packaged lamellas not to that extent set out. 6 are again Limiting lamellae 27 and intermediate lamellae 28 inserted between them. The intermediate plate 28, however, has one together with the limiting plates 27 a channel forming breakthrough 29, which in its geometry of the Configurations according to Figures 3-5 deviates and with a plurality of inputs and Exit openings 30 and 31 communicates, which are also here in each other opposite end faces of the intermediate plate 28 are incorporated.

A filter already mentioned with reference to FIG. 5, which in the case of the design according to Fig. 6 between the communicating with the said channel and Entry openings 30 and 31 is effective, is here, for example, as a textile insert 33 in the form of a textile web section, which is in the opening 29 in Zigzag fold extends between the inlet and outlet openings.

As shown by way of example in FIG. 7, the mentioned ones have inlet and outlet openings communicating channels in an alternative embodiment in the form of bores 34 realized, which in the illustrated embodiment is composed of several layers, Throttle inserts forming blocks, which are shown here in fragments, are provided and these holes 34 penetrate the layers.

The example of FIG. 7 furthermore shows alternative configurations of the above Filters in connection with the channels 34, alternatively in the form of bores shown, the bores 34 forming the aforementioned inlet and outlet openings, between which the filter is effective. In Fig. 7 there is a filter at a) and b) Use of an air-permeable bulk material filling introduced into the bore 34 formed, in a) essentially spherical and in b) granular bulk material is used, while in c) fibers, in d) an air-permeable sponge structure and in e) an air-permeable structure of sintered material is used.

If bulk material or fibers are used, these are the materials receiving holes 34 at a respective end portion thereof with a Air-permeable closure provided, for example in the example shown textile intermediate layers 35 is formed.

In the case of using the sponge structure or the named the intermediate layers 35 and the upper layer in FIG. 7 become sintered material with a corresponding gradation of the inlet and outlet openings End portions of the holes 34 are unnecessary.

In the example in FIG. 8, one of the chambers 13 in FIG. 2 corresponds to the Further alternative to the guide surface section 2.9.1 forming chamber 40 Forming a throttle set 15 'is one with a bulk material - here with plate 36- filled cushion 36 'is provided, which under its nestling to the Chamber wall section 40 'forming openings 11 is inserted into chamber 40.

A cushion cover 36 "surrounding the platelets 36" is on one of the Chamber wall section 40 'facing away from the cushion 36' with air inlet openings 36 '' 'and at least in the part of the chamber wall 40' Section flexible and breathable.

Instead of filling the cushion 36 'with a clippings, there is an alternative Configurations of a textile material, an air-permeable structure of sintered material, an air-permeable sponge structure or a fiber structure is provided.

According to a development shown in FIG. 9, the throttle channels are formed dimensionally stable throttle insert 15 "of a special kind provided that this one the guide surface sections 2.9.1 and 2.9.2 provided to form the smoothing notch 7 and forms openings 11 'provided therein. As indicated in Fig. 9, there is Throttle insert 15 "from an air-permeable structure of sintered material and it forms a closure of a housing 41 provided with a compressed air connection 12, which forms a chamber 42 together with the throttle insert 15 ".

In connection with FIG. 10, it is now also used several times mentioned use of a throttle insert at a location other than the openings 11 received assigned.

In the development shown in FIG. 10, the one from FIG visible bead in an essentially the configuration according to FIG. 2 corresponding first smoothing section 5.1 a plurality of air passage openings 8 are provided along the smoothing notch 7, which form air passage openings 8 with respect to the extent of the smoothing notch 7 transverse to the direction of travel Direction arrow 6 a middle group 8.1 and a respective marginal group 8.2, the middle group 8.1 communicates directly with the flow channel 9, while the Edge groups 8.2 communicate indirectly with flow channel 9 via throttle channels.

The middle group 8.1 extends along the smoothing notch 7 preferably in this way far that the air passage openings 8 of this group within the same Direction of the smallest format of the processed sheets.

With the smoothing device designed in this way is not only a gentle smoothing the sheet 3 but also optimized processing of both sheets with the smallest as well as those with the largest processable format possible. at Processing the largest format will exceed the smallest format Edge areas of the sheets are sufficiently smoothed and when processing the smallest format Excessive incorrect air flow is prevented by means of the throttle ducts, so that the pressure conditions required to form the bead are not excessive deteriorate.

For the formation of the throttle channels, particular reference is made to those already related with the alternatives 3, 6, 7, 8 and 9 presented. However, it is also a training corresponding to FIG. 4 can be used in particular if the in In connection with Fig. 4 mentioned modifications can be provided.

In the embodiment according to FIG. 10, the throttle channels which form dimensionally stable throttle inserts 15 '' 'provided, the throttle channels on the one hand with the Edge groups 8.2 of the air passage openings 8 in the smoothing notch 7 and on the other hand with the flow channel 9 corresponding to the configuration according to FIG. 2 communicate, which also with a suction air connection 10, not shown in FIG. 10 is provided.

As can also be seen from FIG. 10, this closes after an advantageous further development of the invention to the first smoothing section 5.1 in terms of the direction of travel Direction arrow 6 upstream with respect to the first located second smoothing section 5.2, which corresponds externally to the first smoothing section 5.1 and again Faucet sections 2.9.1 'and 2.9.2' and air passage openings 8 ', which the latter cause pressure ratios when operating through flow, which on a Printing material into one provided in the second smoothing section 5.2 Smoothing notch 7 ', projecting bead.

In the embodiment shown as an example in FIG Throttle ducts from one between the further air passage openings 8 'and one at Flow channel 9 'provided suction air connection 10 (see Fig. 11) effective dimensionally stable throttle insert 15 '' '' formed.

The second smoothing section 5.2 described so far unfolds the above Pressure conditions to form a bead protruding into the smoothing notch 7 ' Substrate due to the throttled flow through the air passage openings 8 ' only after the downstream smoothing section 5.1 a appropriate bead is formed. Incidentally, the second smoothing section 5.2 is in With regard to a contactless smoothing process in the first smoothing section 5.1 constructed analogously, d. that is, to form the further smoothing notch 7 ' provided guide surface sections 2.9.1 'and 2.9.2' are with openings 11 and 11 'in If these guide surface sections are formed by means of a structure, for example sintered material, from which throttled compressed air in the direction of the Printing material flows out and its contact with the mentioned guide surface sections prevented.

LIST OF REFERENCE NUMBERS

1

processing station

1.1

pressure cylinder

2

boom

2.1

gripper system

2.2

chain conveyors

2.3

sheet guide

2.4

sheet brake

2.5

Leading-edge stop

2.6

Rear edge stop

2.7

platform

2.8

lifting chain

2.9

sheet guide surface

2.9.1, 2.9.1 '

Leitflächenabschnitt

2.9.2, 2.9.2

Leitflächenabschnitt

2.10

Support

2.11

Gap in the sheet guiding device 2.3

3

arc

4

stack

5

smoothing device

5.1

first smoothing section

5.2

second smoothing section

6

arrow

7, 7 '

smoothing notch

8, 8 '

Air passage opening

8.1

middle group of air openings 8

8.2

Edge group of the air passage openings 8

9, 9 '

flow channel

10

suction air

11, 11 '

opening

12

Compressed air connection

13

chamber

13 '

Chamber wall section

14

chamber

14 '

Chamber wall section

15, 15 ', 15 ", 15' '', 15 '' ''

throttle insert

16

throttle insert

17

first slat

17 '

edge cutting

18

second slat

19, 19 '

boundary lamella

20

intermediate plate

21, 21 '

Recess of the limiting lamella 19 or 19 '

22, 22 '

boundary lamella

23

intermediate plate

24

inlet opening

25

outlet opening

26

Breakthrough of the intermediate lamella 23

27

boundary lamella

28

intermediate plate

29

Breakthrough of the intermediate lamella 28

30

inlet opening

31

outlet opening

32

breathable insert

33

textile use

34

drilling

35

interlayer

36

Tile

36 '

pillow

36 "

cushion cover

36 '' '

Air inlet opening

37

chamber

38

pressure chamber

39

current chamber

40

chamber

40 '

Chamber wall section

41

casing

42

chamber

Claims (27)

Smoothing device for flat printing materials, which are forced over guide surface sections under the guidance of a printing material edge leading in one running direction, which form a smoothing notch and which have at least one air passage opening which communicates with a flow channel and which, in the course of operational flow, causes pressure conditions which on the printing material project into the smoothing notch .
characterized in that the guide surface sections (2.9.1, 2.9.2; 2.9.1 ', 2.9.2') are provided with openings (11; 11 ') which communicate with throttle channels, and in that the throttle channels are pressurized with compressed air during operation , Smoothing device according to claim 1,
characterized in that the throttle ducts are formed by means of lamellae (17, 18; 19, 19 ', 20; 22, 22', 23) which form flow channel sections with a frequently changing flow direction between two mutually opposite lamellae of the lamellae. Smoothing device according to claim 1,
characterized in that the throttle channels are formed from at least one channel communicating with inlet and outlet openings (24, 25; 30, 31) (opening 26, fins 22, 22 '; opening 29, fins 27; bore 34) and one between the Outlets and inlets (24, 25; 30, 31) effective filter. Smoothing device according to claim 3,
characterized in that the filter is formed using a textile insert. Smoothing device according to claim 3,
characterized in that the filter is formed using an air-permeable bulk filling. Smoothing device according to claim 3,
characterized in that filter is formed using fibers. Smoothing device according to claim 3,
characterized in that the filter is formed using a material sintered into an air-permeable structure. Smoothing device according to claim 3,
characterized in that the filter is formed using an insert having an air permeable sponge structure. Smoothing device according to claim 1,
characterized in that the throttle channels are formed by means of a cushion 36 'filled with plate (36) with an air-permeable cushion cover 36 ". Smoothing device according to claim 1,
marked by
a chamber (13; 14; 40; 42) provided with a compressed air connection (12), which forms one of the guide surface sections (2.9.1, 2.9.2; 2.9,1 ', 2.9.2') and one between the openings ( 11; 11 ') and the compressed air connection (12) effective throttle insert (15; 15'; 15 "; 16) connecting to the openings (11; 11 ') and forming the throttle channels. Smoothing device according to claim 10,
characterized in that the throttle insert is formed using an air-permeable bulk material filling. Smoothing device according to claim 10,
characterized in that the throttle insert is formed using textile material. Smoothing device according to claim 10,
characterized in that the throttle insert is formed using fibers. Smoothing device according to claim 10,
characterized in that the throttle insert is formed using a material sintered into an air-permeable structure. Smoothing device according to claim 10,
characterized in that the throttle insert is formed using an air permeable sponge structure. Smoothing device according to claim 10,
marked by
a dimensionally stable throttle insert (15 ") forming the throttle channels, which forms one of the guide surface sections (2.9.1, 2.9.2) provided for forming the smoothing notch (7) and openings (11 ') provided therein. Smoothing device according to claim 1,
characterized in that a plurality of air passage openings (8) is provided along the smoothing notch (7) to form the bead, the air passage openings (8) with respect to the extent of the smoothing notch (7) transverse to the running direction, a middle group (8.1) and a respective edge group (8.2), the middle group (8.1) communicate directly with the flow channel (9) and the marginal groups (8.2) indirectly via throttle channels with the flow channel (9). Smoothing device according to claim 17,
marked by
a formation of the throttle channels assigned to the marginal groups (8.2) according to the characterizing part of one of claims 2-9. Smoothing device according to claim 17,
characterized,
the throttle inserts (15 ''') forming the air passage openings (8) of the edge groups (8.2) via throttle channels communicate with the flow channel (9). Smoothing device according to claim 19,
marked by
a design of the throttle inserts (15 ''') assigned to the edge groups (8.2) according to the characterizing part of one of claims 11-15. Smoothing device according to claim 19,
marked by
a dimensionally stable design of the throttle inserts (15 ''') assigned to the edge groups (8.2). Smoothing device according to claim 1,
characterized in that further guide surface sections (2.9.1 ', 2.9.2') form a further smoothing notch (7 ') upstream of the smoothing notch (7) with respect to the direction of travel (direction arrow 6) and further air passage openings (8') are provided which in the case of operational flow, cause pressure conditions which form a bead protruding into the further smoothing notch (7 ') on the printing material and that the further air passage openings (8') communicate with a further flow duct (9 ') via throttle ducts. Smoothing device according to claim 22,
marked by
a formation of the throttle ducts assigned to the further air passage openings (8 ') in accordance with the characteristic of one of claims 2-9. Smoothing device according to claim 22,
marked by
a throttle insert (15 '''') which acts between the further air passage openings (8 ') and a suction air connection (10) provided on the further flow duct (9') and which forms throttle ducts which communicate with the further air passage openings (8 '). Smoothing device according to claim 24,
marked by
a design of the throttle insert (15 '''') according to the characterizing part of one of claims 11-15. Smoothing device according to claim 24,
characterized in that the throttle insert (15 '''') is dimensionally stable. Sheet-processing printing machine with a smoothing device according to one of the Claims 1-26.

Images