EP1655257B1 - Folder - Google Patents

Abstract

A folding element for a printing press, or sheet handler, has the folding guide (03) with a microporous surface to generate an air cushion and thereby prevent mechanical contact between the guide and the sheets. The pore size is less than 500 microns and the pores are evenly distributed over the surface of the guide. Air is blown through the porous surface from inside the hollow guide.

Description

The invention relates to a folding apparatus according to the preamble of claim 1.

By the DE 299 14 420 U1 a glueing device is disclosed which is arranged between knife cylinder and a collecting cylinder. The glueing device is controllable in such a way that sections which come to rest on the collecting cylinder in collecting mode are glued together before they are transversely folded over a folding jaw cylinder and removed.

In the DE 198 54 053 A1 is a guide device for sheets in a printing unit of a sheet-fed printing machine disclosed. It is arranged in addition to two cylinders forming the printing nip and serves to guide the sheets when entering or leaving the printing nip. It has a multiplicity of openings through which air can flow, for example, bores or porous material, inter alia.

The DE 198 29 095 A relates to a sheet guiding device in the gore-shaped input and output region of the printing nip of a sheet-fed printing machine, which is to ensure a concern and thus a smooth running of the sheet in the area pressure point. A housing of the sheet guiding device has at its the sheet-guiding cylinder opposite guide surface of porous, air-permeable material.

In double-circumference offset presses, as well as in gravure rotary presses with folders which enable collective operation, it is sometimes necessary to glue a web section to a previous section. This is usually done by the use of a nozzle, which on the strand path between the Knife cylinder and the collecting cylinder is arranged, which often causes soiling in the folder with correspondingly high cleaning intervals.

The invention has for its object to provide a folder with a low-pollution sizing.

The object is achieved by the features of claim 1.

The arrangement of a sizing device on the circumference of the collecting cylinder following the expiring gusset (but before the place of product intake) is a particularly low-pollution sizing feasible. In an advantageous embodiment, this region has a guide element, advantageously a non-contact, air-blown guide element, in particular with the formation of microapertures. The sizing can then take place, for example, by an interruption or a recess in the guide element.

Embodiments of the invention are illustrated in the drawings and will be described in more detail below.

Fig. 1

einen Ausschnitt eines Falzapparates mit Leitelement;

Fig. 2

eine vergrößerte Querschnittsdarstellung einer ersten Ausführung des Leitelements mit porösem Material;

Fig. 3

eine vergrößerte Querschnittsdarstellung einer zweiten Ausführung des Leitelements mit Mikrobohrungen;

Fig. 4

eine schematische Darstellung eines Falzapparates mit Auftragvorrichtung;

Fig. 5

eine vergrößerte Querschnittsdarstellung der Auftragvorrichtung aus Fig. 4.

Show it:

Fig. 1

a section of a folding apparatus with guide element;

Fig. 2

an enlarged cross-sectional view of a first embodiment of the guide element with porous material;

Fig. 3

an enlarged cross-sectional view of a second embodiment of the guide element with microbores;

Fig. 4

a schematic representation of a folder with applicator;

Fig. 5

an enlarged cross-sectional view of the applicator device of FIG. 4th

The folding apparatus shown in a simplified section in Fig. 1 comprises a first cylinder 01, in particular a folding blade cylinder 01, a second cylinder 02, in particular jaw cylinder 02, and a guide element 03, in particular Produktleitelement 03, in the Ausgangszwickel the product transfer gap between the two cylinders 01 ; 02 is arranged. When the folder is operating, folding blades (not shown) extending from the folding blade cylinder 01 when passing through the product transfer nip (not shown) press a section 04 to be folded, e.g. B. to be folded product section 04 of a printed product, in a jaw (not shown) of the jaw cylinder 02, where it is trapped and forwarded. The further rotation of the two cylinders 01; 02 causes between the surface of the folding blade cylinder 01 and the product section 04, which is deducted from this, a gap 06 is formed, in which the air pressure from the outside must flow to the outside. This negative pressure hinders the removal of the product section 04 resting against the folding blade cylinder 01. The product guiding element 03 is used inter alia. to erfeichtem the removal of this leading part of the product section 04.

The surface of the guide element 03 has openings 10, in particular micro-openings 10, through which in operation from an internal hollow or interior 07, z. B. a chamber 07, in particular pressure chamber 07, under pressure against the environment fluid standing, z. As a liquid, a gas or a mixture, in particular air, flows. In the figures, a corresponding supply of compressed air into the cavity 04 is not shown. A fluid cushion is formed by the fluid flowing through the micro-openings 10, thereby preventing the product section 04 from striking against an otherwise common product guide plate.

The guide element 03 has the micro-openings 10 at least on a side of its surface facing the product section 04. However, it can also have the openings 10 on other sides not facing the product section 04 or else consist entirely of a material comprising the micro-openings 10 on its longitudinal section cooperating with the product section 04 and form the cavity 07.

This simplest embodiment for the arrangement of the openings 10 is made possible by the formation of the openings 10 as micro-openings 10, since hereby a thinner but more homogeneous air cushion created while a required or resulting volume flow and thus a leakage current on the "open" side considerably reduced is. The high resistance of the micro-apertures 10, in contrast to large-cross-section apertures, causes "not capping" a portion of apertures 10 to result in some sort of short-circuit current. In the total resistance of the falling over the openings 10 partial resistance receives an increased weight.

The formation of the wall of the guide element 03 in the region of the micro-openings 10 can be carried out in different ways, which is indicated in Fig. 1 with "detail A, B" and shown in Fig. 2 and 3 as a detail for the two versions.

In a first embodiment (FIG. 2) for the micro-openings 10, these are in the form of open pores on the surface of a porous, in particular microporous, air-permeable material 09, eg. B. of an open-pore sintered material 09, in particular of sintered metal 09, is formed. The pores of the air-permeable porous material 09 have an average diameter (average size) of less than 150 microns. z. B. 5 to 50 microns, in particular 10 to 30 microns. The material 09 is formed with an irregular, amorphous structure.

The cavity 07 of the guide element 03 may, at least on its cooperating with the product section 04 area, essentially alone from a Cavity 07 formed on this side final body of porous solid material (ie without further load-bearing layers of appropriate strength) may be formed. This substantially self-supporting body is then formed with a wall thickness of greater than or equal to 2 mm, in particular greater than or equal to 3 mm.

In order to achieve a uniform distribution of air exiting at the surface of the microporous material 09 without simultaneously requiring high layer thicknesses of the material 09 with a correspondingly increased flow resistance, it is provided in a first advantageous embodiment (FIG. 2) that the guide element 03 a solid, at least partially air-permeable support 08, in particular support body 08, on which the microporous material 09 is applied as a layer 09. Such a carrier body 08 can be acted upon with compressed air, which flows out of the carrier body 08 through the microporous layer 09 and thus forms an air cushion on the surface of the guide element 03. In a preferred embodiment, the porous material 09 is thus not designed as a load-bearing solid body (with or without frame construction), but as a coating 09 on a feedthroughs 15 or through-openings, in particular metallic, carrier material. Under "non-bearing" layer 09 i.V.m. the carrier body 08 is - in contrast to known for example from the prior art "supporting" layers - understood a structure, wherein the layer 09 is supported over its entire layer length and total layer width each on a plurality of support points of the support body 08. The carrier body 08 has z. B. on its co-operating with the layer 09 width and length respectively a plurality of non-contiguous passages 15, z. B. holes 15, on. This embodiment is distinctly different from a design in which a porous material extending over the entire active surface is self-supporting over this distance, is supported on a frame or carrier only in one end region, and therefore must have a corresponding strength.

In the illustrated embodiment, the carrier material takes substantially the Weight, shear, torsional, bending and / or shear forces of the component, which is why a corresponding wall thickness (eg greater than 3 mm, in particular greater than 5 mm) of the support body 08 and / or a corresponding stiffened construction is selected , The carrier body 08 may be a multi-perforated piece of sheet material such as a stamped sheet or a rigid wire mesh; but is also possible a three-dimensional air-permeable body such as an open-cell metal foam, etc. In the embodiment, the openings are shown as the cavity 07 with the layer 09 connecting holes 15.

The porous material 09 outside the bushing 15 has z. B. a layer thickness which is smaller than 1 mm, on. Particularly advantageous is a layer thickness between 0.05 mm and 0.3 mm.

A proportion of open area in the region of the effective outer surface of the porous material 09, here referred to as opening degree, is between 3% and 30%, preferably between 10% and 25%. In order to achieve a uniform air distribution, it is also desirable that the thickness of the layer 09 at least equal to the distance between adjacent openings of the bores 15 of the support body 08.

Choice of material, dimensioning and pressurization are selected such that 1 to 20 standard cubic meters per m ² , in particular 2 to 15 standard cubic meters per m ² , emerge from the air outlet surface of the sintered material 09 per hour. Particularly advantageous is the air outlet of 3 to 7 standard cubic meters per m ² .

Advantageously, the sintered surface from the cavity 07 out with an overpressure of at least 1 bar, in particular more than 4 bar, applied. Particularly advantageous is an application of the sintering surface with an overpressure of 5 to 7 bar.

Air that has passed through one of the holes 15 of the support body 08 tends to distribute in the pores of the microporous layer 09 both to the surface and sideways, parallel to the surface. Assuming that the flow resistance in the microporous layer 09 is isotropic, the air passing through a bore of the support body 08 is also isotropically distributed in the layer 09. In order to provide a homogeneous gapless air cushion on the surface of the layer 09, it must Air leak on the entire surface, even in those areas under which there is an impermeable surface area of the support body 08. For this purpose, the thickness of the microporous layer 09 may be at least as great as an average distance between adjacent bores 15 on the surface of the carrier body 08.

The wall thickness of the support body 08 at least in the layer 09 supporting area is z. B. greater than 3 mm, in particular greater than 5 mm.

However, the support body 08 may in turn also made of porous material, but with a better air permeability -. B. a larger pore size - be designed as that of the microporous material of the layer 09. In this case, the openings of the carrier 08 are formed by open pores in the region of the surface, and the passages 15 by the randomly formed on the porosity inside the channels. However, the carrier body 08 can also be formed from any desired cavity enclosing the cavity 07, provided with passages 15 flat material or molded material. Combinations of these alternatives are also possible.

The inner cross section of a feed line, not shown, for supplying the compressed air to the turning bar is less than 100 mm ² , preferably between 10 and 60 mm ² .

In a second embodiment (FIG. 3), the micro-openings 03 are designed as openings through holes 12, in particular micro-bores 12, which extend by a z. B. formed as a pressure chamber 07 cavity 07 bounding wall 13, z. B. chamber wall 13, extend outward. The holes 12 have z. B. a diameter (at least in the region of the openings 10) of less than or equal to 500 .mu.m, advantageously less than or equal to 300 .mu.m, in particular between 60 and 150 .mu.m. The opening degree is z. B. at 3 to 25%, especially at 5 to 15%. A hole density is at least 1/5 mm ² , in particular at least 1 / mm ² up to 4 / mm ² . The wall 13 thus has, at least in a cooperating with the product section 04 area, a micro-perforation. Advantageously, the micro-perforation extends - as in the first embodiment, the bushings 15 and layer 09 - at least in the effective range between the guide element 03 and product section 04th

One u.a. the flow resistance influencing wall thickness of the holes 12 containing chamber wall 13 is z. B. at 0.2 to 3.0 mm, advantageously at 0.2 to 1.5 mm. in particular from 0.3 to 0.8 mm. In the interior of the guide element 03, in particular in the cavity 07, a reinforcing construction, not shown, for example, in the longitudinal direction of the guide element 03 extending carrier, in particular metal support, be arranged, on which the chamber wall 13 at least partially or selectively supported.

For the execution of the micro-openings 03 as openings of holes 12 z. B. an overpressure in the chamber 07 of 0.5 to 2.0 bar, in particular from 0.5 to 1.0 bar of advantage.

The bores 12 may be cylindrical, funnel-shaped or else of a special shape (for example in the form of a Laval nozzle).

The microperforation, ie the production of the holes 12, is preferably carried out by drilling by means of accelerated particles (eg liquid such as water jet, ions or elementary particles) or by means of electromagnetic radiation higher Energy density (eg light by laser beam). Particularly advantageous is the production by means of electron beam.

The folding blade cylinder 01 facing side of the holes 12 having wall 13, z. As a stainless steel formed wall 13, in an advantageous embodiment, a dirt and / or color-repellent finish. It has a not shown, the openings 10 and holes 12 not covering coating -. As nickel or advantageous chromium - on which z. B. is additionally processed - z. B. structuring with micro ribs or a lotus flower effect structuring or preferably highly polished).

The holes 12 having the wall 13 is formed in a variant as one or more inserts in a carrier. The insert may be fixed or changeable connected to the carrier. The latter is advantageous with respect to a cleaning or an exchange of inserts of different types of microperforations for adaptation to different product strengths, product weight, etc.

In addition to or instead of the arrangement of the guide element 03 with micro-openings 10 in the described embodiments, a comparable guide element or a plurality of comparable guide elements in the region of the circumference of one or more of the cylinder 01; 02 of advantage.

In a preferred embodiment of the folding apparatus this is designed for a collective production and has an applicator device 23, for. B. Glue device 23 for bonding at least two on the folding blade 01 before transfer to the cylinder 02 on each other collected product sections 04 on (Fig. 4). In contrast to the conventional arrangement, this glueing device 23, z. As a glue applicator nozzle 23, on the periphery of the folding blade 01 between the Ausgangszwickel with the jaw cylinder 02 and the product receiving point of the folding blade 01 arranged. In principle, this advantageous arrangement of the glueing device 23 can be arranged in this area without or together with conventional guiding or guiding devices.

In an advantageous embodiment, however, the folding blade cylinder 01 in its peripheral region provided with the glueing device 23 has a guide element 18 which has air outlet openings at least in this area and forms an air cushion for guiding in order to stabilize and calm the product run. For this purpose, as shown in Fig. 4, the guide element 18 in o. G. Circumferentially arranged and has, as indicated in Fig. 5, a recess 24, for. B. an opening 24 through which of the glue application nozzle 23 glue on the product portion 04 can be applied. However, the glue can also be applied by a different type of interruption of the guide element 18. A fluid under pressure can be supplied to the guide element 18, for example, by a feed 26. The guide element 18 is particularly advantageous embodiment provided with the micro-openings 10 in the manner described for Fig. 1 to 3. This ensures a gentle and quiet product run, which leads to an exact bond and low pollution.

The folder may be described in one or more of said sections guide elements 03; 16 to 19 have. Basically, independently of this, he can have the glueing device 23 at the named location.

The product section 04 represents a by a cross-cutting device 25 after processing, especially after printing, a web, z. B. web, generated section of this web.

LIST OF REFERENCE NUMBERS

01

Cylinder, folding blade cylinder

02

Cylinder, jaw cylinder

03

Guide element, product guide

04

Section, product section

05

-

06

gap

07

Interior, cavity, chamber, pressure chamber

08

Carrier, carrier body

09

Layer microporous; Material, permeable to air, microporous; Sintered material; Sintered metal, coating

10

Opening, micro opening

11

-

12

Bore, micro bore

13

Wall, chamber wall

14

-

15

Bushing, drilling

16

-

17

-

18

vane

19

-

20

-

21

-

22

-

23

Applicator, glue device, glue applicator nozzle

24

Recess, breakthrough

25

Cross-cutting device

26

feed

A

detail

B

detail

Claims (29)

1. A folder with a folding-blade cylinder (01), which has a product-receiving station for receiving a product portion (04) produced by a transverse slitter (25) after the printing of a web and which co-operates with a folding-jaw cylinder (02) in order to form a transverse fold, wherein the folder has an application apparatus (23) for the application of adhesive, characterized in that, as viewed in the direction of rotation, the application apparatus (23) is arranged on the periphery of the folding-blade cylinder (01) between its run-out cleft with the folding-jaw cylinder (02) and the product-receiving station of the folding-blade cylinder (01).
2. A folder according to Claim 1, characterized in that a guide element (18) for guiding a product portion (04) is arranged on the periphery of the folding-blade cylinder (01) in the surrounding region of the application apparatus (23), the external face of the said guide element (18) having a plurality of openings (10) for the discharge of a fluid under pressure.
3. A folder according to Claim 2, characterized in that the openings (10) are designed in the form of micro-openings (10) with a diameter of less than 500 µm.
4. A folder according to Claim 3, characterized in that the micro-openings (10) are designed in the form of open pores of a porous material (09) through which the fluid flows.
5. A folder according to Claim 4, characterized in that the porous material (09) through which fluid can flow has pores of a size of from 5 to 50 µm, and in particular from 10 to 30 µm.
6. A folder according to Claim 4, characterized in that the porous material (09) is designed in the form of an open-pored sintered material (09), in particular in the form of a sintered metal (09).
7. A folder according to Claim 4, characterized in that the micro-porous material (09) is designed in the form of a substantially self-supporting hollow body which, by means of its internal boundary face, forms at least one cavity (07) which is effective as a pressure chamber (07).
8. A folder according to Claim 7, characterized in that the hollow body formed by the porous material (09) has a wall thickness of at least 2 mm.
9. A folder according to Claim 4, characterized in that the micro-porous material (09) is designed in the form of a layer (09) on a support (08) which is load-bearing but through which fluid can pass at least locally.
10. A folder according to Claim 9, characterized in that on its side facing the layer (09) the support (08) has at least one support face connected to the layer (09) as well as a plurality of openings for the supply of the fluid into the layer (09).
11. A folder according to Claim 9, characterized in that in the region of the support face the layer (09) has a thickness of less than 1 mm, and in particular from 0.05 mm to 0·3 mm.
12. A folder according to Claim 9, characterized in that on its width and length cooperating with the layer (09) the support (08) has in each case a plurality of passages (15), in particular which are not continuous.
13. A folder according to Claim 9, characterized in that the support (08) is formed from a flat material or shaped material enclosing the cavity (07) and provided with passages (15).
14. A folder according to Claim 9, characterized in that a wall of the support (08) carrying the layer (09) has, in profile, essentially a curvature which is based upon the product running.
15. A folder according to Claim 9, characterized in that a wall of the support (08) carrying the layer (09) is constructed in the form of a curved wall with a profile essentially in the shape of a segment of a circle.
16. A folder according to Claim 9, 14 or 15, characterized in that a wall thickness of the support (08) or at least the wall carrying the layer (09) is greater than 3 mm, and in particular greater than 5 mm.
17. A folder according to Claim 4, characterized in that a degree of opening on the outwardly directed surface of the porous material (09) is between 3% and 30%, and preferably between 10% and 25%.
18. A folder according to Claim 3, characterized in that the micro-openings (10) are designed in the form of outwardly directed openings (10) of micro-bores (15) in a wall (13) which bounds the guide element (03; 16; 17; 18; 19) towards the outside.
19. A folder according to Claim 18, characterized in that a diameter of the openings (10) is smaller than or equal to 300 µm, and in particular between 60 and 150 µm.
20. A folder according to Claim 18, characterized in that a wall thickness of the wall (13) containing the openings (10) is from 0.2 to 3.0 mm.
21. A folder according to Claim 18, characterized in that a hole density, i.e. a number of openings (10) per unit of area, for the face provided with the micro-openings (10) amounts to at least 0.2 / mm².
22. A folder according to Claim 2, characterized in that from 1 to 20 standard cubic metres of air issue per hour onto a square metre of the external face comprising the openings (10).
23. A folder according to Claim 2, characterized in that from 2 to 15, in particular from 3 to 7, standard cubic metres of air issue per hour onto a square metre of the external face comprising the openings (03).
24. A folder according to Claim 4, characterized in that the porous material (09) is acted upon with at least 1 bar of over-pressure from the inside.
25. A folder according to Claim 4, characterized in that the porous material (09) is acted upon with more than 4 bar, and in particular with from 5 to 7 bar, of over-pressure by the fluid from the inside.
26. A folder according to Claim 2, characterized in that a supply line for supplying the fluid to the guide element (03; 16; 17; 18; 19) has an internal cross-section of less than 100 mm², and in particular between 10 and 60 mm².
27. A folder according to Claim 2, characterized in that the fluid under pressure is in the form of compressed air.
28. A folder according to Claim 3, characterized in that the part of the guide element (03; 16; 17; 18; 19) having the micro-openings (10) is constructed in the form of a releasable insert (14) on a support.
29. A folder according to Claim 2, characterized in that the guide element (18) has a recess (24) through which adhesive is capable of being applied to the product portion (04) by means of an application apparatus (23).

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