EP2960194B1 - Folding roller with rubber-elastic inserts - Google Patents

Description

The invention relates to a folding roller, which has rubber-elastic inserts on its lateral surface, on which roll the folding rollers at least partially wrapping conveyor belts. Furthermore, the invention relates to a device for forming folds, which has a folding roller according to the invention.

For forming folds of, for example, in offset, gravure or inkjet printing printed sheets or webs, which are separated before the folding in sheets, a so-called Messerfalz- or Schwertfalz device is known from the prior art. Such a device usually consists of a folding table with a recess on which the sheet to be folded comes to rest. To form the fold of the sheet is pressed by a folding blade through the recess of the folding table in the inlet gap of two counter-rotating folding rollers. The folding rollers capture with their lateral surfaces the bow and promote this to form a fold, which runs parallel to the axis of rotation of the folding rollers, in a ribbon cable. This ribbon usually consists of several spaced apart at a certain distance conveyor belts which wrap around the folding rollers at least partially. The basic principle of operation of such a folding device is for example in the DE 574360 or in the DE 28 37 392 C3 described.

The folding rollers used in such folding devices are also known from the prior art. So revealed the DE 38 36 342 A1 a so-called clocked folding roller, which has no continuous cylindrical surface. The DE 199 56 248 A1 discloses folding rollers with partial recesses in the lateral surface of the folding roller, the DE 197 02 252 A1 describes a folding roller with an axially parallel along the folding roller extending folding strip. In the DE 103 04 534 A1 discloses a folding roller having a friction layer on certain parts of the surface.

The EP1 000 894 A2 discloses an apparatus for processing paper sheets in which at least one roller of a pair of folding rollers is coated with an elastic coating in order to increase the friction and thus the grip for the products to be processed.

However, all the folding rollers known from the prior art have on them circulating conveyor belts, which roll directly on the Falzwalzenkörper. These conveyor belts run to ensure a unique position usually in circumferentially extending grooves. The case used for transport belts usually have a higher compared to the surface of the folding roller friction coefficient, since the conveyor belts must ensure the safe and cycled transport of the folded sheets even after the formation of the fold.

For this reason, the grooves in the folding rollers are generally dimensioned such that the conveyor belt protrudes slightly beyond the lateral surface of the folding roller. In principle, it is also possible that the at least one conveyor belt rests on the outer surface of the Falzwalzenkörpers and the Falzwalzenkörper thus has no circumferential groove or grooves, which depends on the substrate and the expected folding quality. Optionally, more conveyor belts are required over the axial extent of the folding roller to ensure a more homogeneous surface in this embodiment.

However, in particular with thin folded products or folded products from a non-slip printing material, the correct setting of the folding roller gap on the product thickness is extremely important. Too large a folding nip can result in either that the seam is not formed cleanly or that the sheet pressed by the folding blade into the folding nip does not catch on the folding rollers and thus not weggefalzt what leads to so-called stoppers. Too narrow Falzwalzenspalt usually leads to creases or other damage to the folded sheets and can also lead to increased wear of folding rollers, conveyor belts and / or the folding blade.

Since the folding process even with the correct setting of the Falzwalzenspaltes particular conveyor belts are subject to wear, the supernatant of the bands to Falzwalzenoberfläche, which on the one hand requires an adjustment of the Falzwalzenspaltes, on the other hand makes the setting of the Falzwalzenspaltes especially sensitive to critical productions.

With regard to the wear but also the transport behavior of the conveyor belts is aggravating that according to the prior art, the system folding rollers - conveyor belt has almost no elasticity, since the thickness is usually only about one to two millimeters and thus very stiff in this orientation Conveyor belts run on the hard, usually metal Falzwalzenkörpern.

The invention is therefore an object of the invention to provide a solution with which on the one hand reduces the wear of the conveyor belts and at the same time the setting of the folding rollers and the Falzwalzenspaltes less sensitive and thus less susceptible to interference can be designed.

This object is achieved by a device according to claim 1. The device according to the invention comprises a folding roller which has at least one rubber-elastic insert in at least one region in the axial extent, at which in each case at least one conveyor belt at least partially wraps around the folding rollers.

Such an embodiment of the folding rollers has the advantage that the at least one conveyor belt of the strip line does not rest on the rigid and thus unyielding folding roller body or in a mounted on the Falzwalzenkörper circumferential groove, but that by the rubber-elastic insert the conveyor belt in the radial direction of the folding roller a yielding having. As a result, a conveyor belt when dipping the folding blade in the Falzwalzenspalt and thereby taking place impressions of the sheet to be folded in the Falzwalzenspalt to the expression of a fold parallel to the axis of rotation of the folding rollers in the radial direction of the folding roller dodge. This has the advantage that the wear of the respective conveyor belt in comparison with the prior art, in which the conveyor belt rests on the hard, mostly metallic and thus unyielding folding roller body or in a mounted on the Falzwalzenkörper circumferential groove is significantly reduced. On the other hand, the flexibility of the setting of the Falzwalzenspaltes is significantly reduced by the flexibility, d. H. In particular, when folding thin folded products or folded products from poorly textured or suitably coated printing material, the danger of stoppers in case of too small or too large Falzwalzenspalt or folding problems such as creases or damage to the substrate surface can be significantly reduced at too small Falzwalzenspalt.

In this case, there is no difference in terms of the advantages just mentioned, whether the rubber-elastic insert has a width which corresponds at least to the width of the conveyor belt, so that the conveyor belt rests on the rubber-elastic insert over its entire width, or if the rubber-elastic insert has a width which smaller than the width of a conveyor belt, so that the conveyor belt rests only partially on the rubber-elastic insert. For it is essential that in at least one area over the conveyor belt width, in which the conveyor belt rests on the rubber-elastic support, a larger projection in the radial extent of the folding roller is present, as in the areas across the width of the conveyor belt, in which the conveyor belt may not rests on the rubber-elastic pad.

In one embodiment of the invention, the rubber-elastic insert made of a compressible material. The advantage here is that in the dimensioning of the groove for the insert no consideration of the change in shape must be considered and thus the insert does not change, for example, the position of the Falzwalzenkörper. A particular advantage of this expression is the ability to produce the insert is not one or more closed rings made of rubber-elastic material, but this as a strip with finite extent, preferably this extension corresponds to the circumference of the corresponding groove to perform. This embodiment of the invention will be explained later in more detail.

In a further advantageous embodiment of the invention, the rubber-elastic insert of incompressible material. Such an embodiment offers, for example, the advantage that commercially available rings of gummiartigem material such as NBR-70 or polyurethanes, which are available in a large selection and at low cost, what the procurement as well as the availability for both the manufacturer and for the End user designed favorably. For example, rubber rings with a diameter of the cross section of 2 to 10 mm can be used.

Thus, in a further advantageous embodiment of the invention, at least one rubber-elastic ring can be used as a rubber-elastic insert.

This feature has the advantage that the insert has no impact or no seam, so that at all points in the circumferential direction of the folding roller, the insert has the same property. This is particularly necessary when undetected folding rollers, ie folding rollers, where the folding in the form of dipping the folding blade and thus the Wegfalzen the sheets to be folded in the circumferential direction of the folding roller always takes place at different positions. But also with clocked folding rollers, so with folding rollers in which the folding process in the form of immersion of the folding blade and thus the Wegfalzen the sheets to be folded in the circumferential direction of the folding roller always takes place at the same position, this embodiment of the insert is advantageous because during assembly no absolute position of the insert must be considered for Falzwalzenkörper.

Furthermore, for the sake of completeness, it is stated here that these rubber-elastic rings can have any cross-section, such as, for example, a circular, polygonal or otherwise shaped cross-section. Due to the possibly different behavior here only the hardness of the materials are adapted to the respective cross section.

A significant advantage of the closed rings as a deposit is that they have the same properties in the circumferential direction of the folding roller. However, in this embodiment, a disadvantage that the folding roller must be removed from the Falzwalzenlagerung to mount new deposits on the roller can.

The effort required for this purpose can be reduced in a further advantageous embodiment of the invention, if on the folding roller in at least a limited range of axial extent, which is not covered by conveyor belts, endless, at least one annular insert is stored for storage. Thus, in the event of damage or fatigue of the inserts, the worn annular and thus closed inserts may be cut open and removed from the folding roller, whereas new annular inserts are pushed from the stock forming area into the corresponding groove for the insert without having to disassemble the folding roller ,

To completely avoid this disassembly of a folding roller, a further advantageous embodiment of the invention is that as insert a strip-shaped body with finite extension in the longitudinal direction is used, which is preferably clamped in the groove for the insert in the form that the insert without additional Fixing elements is fixed on the folding roller. This is done, for example in that the groove for the insert has a cross section which in the radial direction of the folding roller has a tapered cross section, for example a trapezoidal cross section.

Such a design has the advantage that for the replacement of the rubber-elastic insert the folding roller does not have to be dismantled, due to the existing impact of the insert such an embodiment is preferably in clocked folding rollers, d. H. in folding rollers, in which the immersion of the folding blade seen in the circumferential direction of the folding roller always takes place in the same place, are used.

A further preferred embodiment of the invention is that the rubber-elastic inserts are mounted in first regions in the axial extension, in which in a first operating state, the conveyor belts at least partially wrap around the folding roller and at the same time in the second regions in the axial extension turn at least one rubber-elastic insert is attached so that in case of wear of the insert of the at least one first region, the conveyor belts are offset in a second operating state to the locations of the second regions. This embodiment is possible both with inserts of endless rings as well as with inserts of strips of finite extent and reduces the maintenance costs and thus the downtime.

Fig. 1

eine schematisierte Falzeinrichtung zur Ausbildung eines Falzes mittels Falzmesser und Falzwalzen;

Fig. 2

eine dreidimensionale Darstellung eines Falzwalzenpaares bestehend aus zwei Falzwalzen mit zugehöriger Bandleitung;

Fig. 3

eine zweidimensionale Darstellung eines Falzwalzenpaares mit dargestelltem Falzwalzenspalt;

Fig. 4

eine erfindungsgemäße Falzwalze ohne Transportbänder, jedoch mit gummielastischen Einlagen;

Fig. 5

mögliche Ausgestaltungen der gummielastischen Einlagen, wobei das Transportband über seine gesamte Breite auf der Einlage aufliegt;

Fig. 6

mögliche Ausgestaltungen der gummielastischen Einlagen, wobei das Transportband über seine Breite nur teilweise auf der Einlage aufliegt;

Fig. 7

mögliche Ausgestaltungen der gummielastischen Einlagen, wobei das Transportband über seine gesamte Breite auf der Einlage aufliegt und im Bereich der Umschlingung eine kalottenförmige Mantelfläche ausbildet;

Fig. 8

eine mögliche Ausführung der erfindungsmäßen Falzwalze mit gummielastischen Einlagen in ersten und zweiten Bereichen.

Preferred embodiments of the invention will become apparent from the dependent claims and the description below. Various embodiments of the invention will be described, without being limited thereto, with reference to the drawings. Showing:

Fig. 1

a schematized folding device for forming a fold by means of folding blade and folding rollers;

Fig. 2

a three-dimensional representation of a pair of folding rollers consisting of two folding rollers with associated ribbon cable;

Fig. 3

a two-dimensional view of a Falzwalzenpaares with illustrated Falzwalzenspalt;

Fig. 4

a folding roller according to the invention without conveyor belts, but with rubber-elastic inserts;

Fig. 5

possible embodiments of the rubber-elastic inserts, wherein the conveyor belt rests over its entire width on the insert;

Fig. 6

possible embodiments of the rubber-elastic inserts, wherein the conveyor belt rests only partially over its width on the insert;

Fig. 7

possible embodiments of the rubber-elastic inserts, wherein the conveyor belt rests on the insert over its entire width and forms a dome-shaped lateral surface in the region of the loop;

Fig. 8

a possible embodiment of erfindungsmäßen folding roller with rubber-elastic inserts in the first and second areas.

The present invention relates to a folding roller with a cylindrical folding roller body with one or more areas in the axial extent, in each of which at least one conveyor belt is guided and where at least one conveyor belt at least partially wraps around the folding roller, at least one rubber-elastic insert.

Moreover, the invention relates to a device for forming a fold, which has at least one folding roller according to the invention.

Fig. 1 schematically shows a folding device 1 for folding sheets of a substrate, as used for example in offset, gravure or printing presses with druckvariablem printing method such as inkjet printing. The sheet to be folded comes on the folding table. 4 above the folding rollers 10 to lie and is pressed by the folding blade 3 in the nip 15 of the folding rollers 10. As an exemplary embodiment of such a knife folding or Schwertfalz device, a design with folding drum 2 is shown. The folding drum 2 rotates about its longitudinal axis and has a gear which also sets the folding blade 3 in rotation about its longitudinal axis. By appropriate coordination of the geometries of folding drum 2 and folding blade 3, the tip of the folding blade 3 moves on a vertical plane, which preferably extends centrally through the Falzwalzenspalt. As an alternative forms of the folding blade 3, the prior art also discloses rockers which perform a rotary movement in a plane parallel to the axis of rotation of the folding rollers 11. Alternatively, a rocker with oscillating movement of a folding blade 2 can also be used, which pushes the sheet to be folded between the folding rollers with their rocking motion.

When the sheet to be folded or the stack of sheets to be folded is pressed into the folding roller gap 15, this is detected by the lateral surface of the folding rollers 10 and the folding rollers 10 partially wrapping at least one conveyor belt 21 and pulled through the nip 15, wherein a fold in parallel is formed to the axis of rotation of the folding rollers 11. The folded product is transported further with the seam back with the ribbon cable 20 and laid out, for example via a paddle wheel 30 on a delivery belt 31.

Fig. 2 shows the folding roller pair consisting of two counter-rotating about the respective axis of rotation 11 rotating folding rollers 10. Further, in Fig. 2 the ribbon 20 is shown, which ensures the transport of the product to be folded. The strip line 20 consists of at least one conveyor belt 21, which is driven by the rotation of the folding roller 10, which is to be folded or the folded product between the two conveyor belts 21 clamped and transported by frictional engagement. Therefore, a conveyor belt usually has a higher coefficient of friction than the lateral surface of the Falzwalzenkörpers 12. Preferably, over the length of the folding roller 10 and thus over the maximum width of the product to be folded a plurality of conveyor belts 21 are used, these conveyor belts 21 are in the axial extension of the folding roller 21 at both folding rollers 10 at the same position, so that the respective opposite conveyor belts 21 can clamp the product to be folded. On the example shown, three conveyor belts 21 are used across the width of a folding roller 10.

Fig. 3 shows the Falzwalzenkörper 12 of the folding rollers 10 in side and front view; In this case, it can be seen that at the regions of axial extension, on which the conveyor belts 21 are positioned and wrap around the folding roller 10 at least partially, each having a groove 13. From the prior art, the grooves are pronounced in the form that a conveyor belt each having a supernatant of about 0.05 to 0.5 mm relative to the outer surface of the Falzwalzenkörpers, so that the product to be folded safely detected by the conveyor belts 21 can be. In the prior art, the grooves 13 are so pronounced that the conveyor belts rest directly on the roller body 12 and roll on this accordingly.

The small thickness of the conveyor belts 21 and the resulting high rigidity in the radial direction of the folding roller 10 has the consequence that no or only a low flexibility or elasticity is present, so that the nip 15 exactly to the respective thickness of the product to be folded must be adjusted. The measure of the nip 15 corresponds approximately to the thickness of the finished folded product, which results from the number of Bedruckstofflagen and the thickness of the printing material.

However, the setting of the nip 15 also depends on the surface finish of the folding roller 10, the conveyor belts 21 but also on the surface and the friction behavior of the printing material. Thus, when adjusting the nip 15 appropriate care is required, because too narrow a set nip leads to damage of the product to be folded as markings, abrasion or even creases. In an extreme case, the product to be folded is not pulled through the folding roller gap, remains lying on the folding table 4 of the folding device 1 and leads to so-called stoppers. Furthermore, too narrow adjustment of the nip 15 leads to increased wear of the conveyor belts 21, the folding blade 3 or even the folding rollers 10. If the folding roller gap 15 is set too high, the product to be folded will not be picked up by the folding rollers 10 or the conveyor belts 21 and likewise not or not reliably pulled through the roller gap 15, which also becomes a stopper and thus can lead to production disruptions.

In the known according to the prior art folding rollers 10, the conveyor belts 21 are subject to wear, which on the one hand, the coefficient of friction of the conveyor belts 21 and the other Wegfalzverhalten changes, since the wear of the conveyor belt 21 to a lesser projection of a conveyor belt 21 to the outer surface of the Falzwalzenkörpers 12 leads.

Fig. 4 shows an embodiment of a folding roller 10 according to the invention, which in the regions in the axial extent, at which the conveyor belts 21 at least partially wrap the folding roller 10, at least one rubber-elastic insert 16 is mounted on the folding roller 10. Here, the circumferential grooves 13 are matched in the Falzwalzenkörper 12 in the manner of the thickness of the insert 16 and the conveyor belt 21 that the conveyor belt has a supernatant of about 0.05 to 0.5 mm - depending for example on the elasticity of the insert 16 and For example, the friction coefficient of the conveyor belt 21 used - with respect to the outer surface of the folding roller 10 has. The conveyor belts 21 run in the folding roller 10 according to the invention no longer directly on the Falzwalzenkörper 12, but on the rubber-elastic insert 16. This results in a compliance of the conveyor belt 21 in the radial direction of the folding roller 10, which reduces the wear of the conveyor belts 21 and at the same time due the existing elasticity, the adjustment of Falzwalzenspaltes 15 no longer must be so sensitive. This can both reduce the risk of damage to the printed products and increase production reliability by avoiding stoppers.

A not shown by a figure embodiment of the invention is also that the folding roller 10 according to the invention not at each area where a conveyor belt 21, the folding roller 10 at least partially wraps around, a rubber-elastic Insert 16 has, but a rubber elastic insert 16 only in at least one area in which a conveyor belt 21, the folding roller 10 at least partially wraps, is attached. This may be advantageous, for example, in the case of inhomogeneous products to be folded in the axial extent of the folding roller 10.

At the in Fig. 4 illustrated exemplary embodiment of a folding roller 10 according to the invention in the areas of axial extent in which a conveyor belt 21, the folding roller 10 at least partially wraps around, a circumferential groove 13 running. This groove 13 circulating in the folding roller body 12 can either be embodied only as a peripheral insert groove 17, in which the rubber-elastic insert 16 is positioned.

However, it is also possible to perform the circumferential groove 13 in the form that the circumferential insert groove 17 is only part of the circumferential groove 13, and the circumferential groove 13 in addition to the circumferential insert groove 17 has a circumferential conveyor belt groove 14 , In such a stepped running groove 13 is in the radially inner region of the groove, d. H. in the insert groove 17, the rubber-elastic insert positioned, whereas the radially outer conveyor belt groove 14 serves to guide a conveyor belt 21 in the axial direction. In this embodiment, the outer circumferential surface of the folding roller body 12 projects beyond the outer enveloping lateral surface of the rubber-elastic insert 16 and the respective conveyor belt 21 projects into the circumferential groove 13.

At the in Fig. 4 illustrated folding roller 10 are shown as an insert 16 for a conveyor belt 21 exemplified four closed rings made of elastomeric material with a circular cross-section, but this corresponds to only one embodiment, because as insert 16 only one annular structure or any number of annular structures can be used.

Further, in the choice of the materials of the inserts 16 there are various possibilities: for example, inserts 16 of compressible material can be used or incompressible materials are used for this purpose. The choice of suitable material depends here on the one hand on the combination of the materials for conveyor belts 21, insert 16 and the substrate to be folded as well as on the geometry such as the cross section of Insert 16 and the groove 13. Furthermore, the choice of the design of the insert 16 is dependent.

In the example shown the Fig. 4 For example, several closed as insert rings of rubber-elastic material such as NBR-70 or polyurethane are used. Depending on the dimensions of the groove 13 and the conveyor belt 21 used, however, only a single ring of rubber-elastic material can be used as an insert 16. This ring or these rings are pushed from the front side in the axial direction on the folding roller 10. Here, the folding roller 10 from the in Fig. 4 not shown storage removed. However, since also the inserts 16 are subject to some wear, is on the folding roller 10 in a region of limited axial extent, which preferably does not come during the folding process in contact with the product to be folded, as storage 19 of at least one insert 16 or preferably of several Inserts 16 formed. This stocking 19 of deposits 16 has the advantage that when wear of the inserts 16 and thus for the exchange of these, the folding roller 10 does not have to be removed from the storage, not shown, because to exchange an insert 16, this is cut - if this is still required - so that the worn insert 16 can be removed, a new insert 16 is pushed from the region of the storage 19 of deposits 16 in the axial direction of the folding roller 10 at the corresponding location in a groove 13.

In a further advantageous embodiment of the invention, not shown, a plurality of regions formed as a storage 19 can also be embodied in the axial extent of the folding roller 10.

Fig. 5 shows in an embodiment in which the conveyor belt 21 rests on an insert 16 over the entire width. For clean positioning or guidance of insert 16 and conveyor belt 21, the groove 13 is advantageously designed in the form that it is executed discontinued. Thus, the groove 13 consists of a seen in the radial direction outer conveyor belt groove 14 and seen in the radial direction further inside insert groove 17. However, is a such embodiment is not mandatory, provided that the conveyor belt 21 is otherwise guided at the correct axial position.

While Fig. 5a ) Inserts 16 of circular cross section is in Fig. 5b ) shows an example of inserts 16 of polygonal cross-section. This example illustrates that 16 rings with different cross-sections can be used as inserts. This increases the choice of commercially available rings made of rubber-elastic material, which preferably have a hardness of about 25 to about 100 Shore.

While in Fig. 5a) and 5b ) Deposits 16 from closed, thus endless rings are shown in Fig. 5c ) exemplified an embodiment of a liner 16, which can also be made of a strip of rubber-elastic material with finite extent. For such a configuration of an insert 16 has the advantage that for the exchange of the insert 16, the folding roller 10 does not have to be removed from the storage, not shown, since such insert 16 can be applied in the radial direction from the outside to the folding roller 10. Preferably, the strip-shaped insert 16 of the Fig. 5c ) has a length which corresponds to the circumference of the neutral fiber in the mounted state on the folding roller 10. Thus, the insert 16 in this embodiment, although seen in the circumferential direction to a shock, but this is not a disadvantage in clocked folding rollers 10.

Advantageously, in this embodiment of the insert 16, the insert groove 17 is designed such that it is possible to dispense with additional fixing elements for clamping the rubber-elastic insert 16. This is achieved, for example, by virtue of the fact that the circumferential insert groove 17 for receiving the insert 16 has a cross section which has a cross-section which reduces in size outwardly in the radial direction and which may, for example, have a trapezoidal shape. Preferably, but not necessarily, come in such a configuration of the insert 16 compressible materials such as foamed polyurethanes for use.

Alternatively, to ensure the fixed position of the insert 16 on the folding roller 10, an additional fixing element such as an adhesive substance can be used.

The Fig. 6a), 6b) and 6c ) show an embodiment of the invention in which a conveyor belt 21 rests only partially over its width on a respective insert 16. Such a configuration has the advantage that an optimal guidance of the conveyor belt 21 is ensured by clean delimitation of the conveyor belt groove 14 and the insert groove 17.

Fig. 7a), 7b) and 7c ) show an embodiment in which a conveyor belt 21 rests over its width only to a relatively small proportion on a rubber-elastic insert 16. By this variation of the width of the insert 16, the spring stiffness and thus the elasticity of the insert 16 can be changed in the same material or in the same commercial rings used. Thus, it is either possible to use for different products to be folded, ie, for example, for folded products made of different materials or, for example, for different thicknesses to be folded products different folding rollers 10 with different widths deposits 16 with different elasticity or provide without as wear parts different rings to stockpile.

A particular embodiment of the folding roller 10 according to the invention is to use 10 different widths inserts 16 in the axial extent of the folding roller, which is particularly advantageous when viewed in the axial extent of the folding roller asymmetric folding products advantage.

Like that Fig. 5 to 7 can be seen, is also a combination of different folding rollers 10 with different deposits 16 or even the combination of folding rollers 10 with deposits 16 and folding rollers 10 without deposits possible and depending on the frame parameters in particular of the product to be folded advantageous.

Fig. 8 shows a further advantageous embodiment of a folding roller 10 according to the invention, in which, in addition to the or the deposits 16 in first areas 16 'in axial extent, on which or the conveyor belts 21 at least partially wrap around the folding roller 10 and which have a circumferential groove 13 and an insert 16 inserted therein, a second region 16 "is mounted on the folding roller 10, which also has a circumferential groove 13 with a Advantageously, but not necessarily, the inserts of the second regions 16 "are disposed in relative proximity adjacent to the inserts of the first regions 16 '. However, the distance should at least be designed such that conveyor belts 21 can run simultaneously in the first area 16 'and in the second area 16 "in order to ensure a sufficient distance of the first areas 16' from the second areas 16". This refinement has the advantage that when a deposit is worn in a first area 16 ', the corresponding conveyor belt 21 only has to be displaced laterally into the corresponding second area 16 ", thereby additionally minimizing maintenance costs and thus additionally increasing availability, in particular when this embodiment is carried out in combination with the stocking 19 of inserts 16. A requirement of this embodiment is that the two axially corresponding conveyor belts 21 of both folding rollers 10 are displaced from a first region 16 'into a second region 16 "or vice versa and In addition, the strip line 20 to avoid the lateral bleeding in the region downstream of the folding rollers 10 in addition to guide elements in alignment with the first areas 16 'additional guide elements in alignment with the second areas 16 "have.

A particularly advantageous embodiment of the invention is that the width and / or the elasticity of the insert of the first regions 16 'differ from the width and / or elasticity of the insert of the second regions 16 ", since by this embodiment of the folding roller 10 according to the invention Elasticity and thus the folding or conveying behavior of the folding rollers 10 exclusively by lateral displacement of the conveyor belts 21 and thus without exchange of the folding roller 10 or the inserts 16 can be adapted to the respective substrate or the product to be folded.

LIST OF REFERENCE NUMBERS

1

folding device

2

folding drum

3

folding blade

4

folding table

10

folding roller

11

axis of rotation

12

Falzwalzenkörper

13

groove

14

Conveyor groove

15

nip

16

inlay

16 '

first area

16 "

second area

17

Insert groove

18

Supernatant conveyor belt

19

stocking

20

stripline

21

conveyor belt

30

paddle wheel

31

delivery belt

Claims (15)

1. A folding roller (1) comprising a cylindrical folding roller body (12), on which at least one conveyor belt (21) is guided in at least one axial region, characterized in that the folding roller (10) comprises at least one rubber-elastic insert (16) in the in or each region in axial extension, in which the respective conveyor belt (21) wraps at least partially around the folding roller (10).
2. The folding roller according to claim 1, characterized in that the respective rubber-elastic inert (16) has a width, so that the conveyor belt (21), which rolls on the insert (16), at least partially bears on the rubber-elastic insert (16) .
3. The folding roller according to one of claims 1 to 2, characterized in that the folding roller body (12) has a circumferential insert groove (17), in which the insert (16) is positioned.
4. The folding roller according to claim 3, characterized in that the circumferential insert groove (17) is part of a circumferential groove (13), which, in addition to the circumferential insert groove (17), has a circumferential conveyor belt groove (14).
5. The folding roller according to one of claims 1 to 4, characterized in that the outer jacket surface of the folding roller body (12) protrudes over the outer enveloping jacket surface of the rubber-elastic insert (16) and the respective conveyor belt projects into the circumferential groove (13).
6. The folding roller according to claim 1 or 2, characterized in that the or each rubber-elastic insert (16) consists of a compressible material.
7. The folding roller according to one of claims 1 to 5, characterized in that the or each rubber-elastic inset (16) consists of an incompressible material.
8. The folding roller according to one of the preceding claims, characterized in that at least one endless ring of rubber-elastic material is used as rubber-elastic insert (16) .
9. The folding roller according to claim 8, characterized in that at least one rubber-elastic ring comprising circular, polygonal or any cross section is used as insert (16).
10. The folding roller according to one of the preceding claims, characterized in that the folding roller (10) has at least one region in limited axial extension, which is not covered by conveyor belts (21), wherein said at least one region serves for stocking (19) at least one insert (16) on the folding roller (10) in each case.
11. The folding roller according to one of claims 1 to 7, characterized in that at least one strip of finite length, which preferably corresponds to the length of the circumference of the neutral fiber of the strip in the assembled state on the folding roller (10), of rubber-elastic material is used.
12. The folding roller according to claim 11, characterized in that the circumferential insert groove (17) has a cross section, so that additional fixing elements can be omitted for clamping the insert (16) in circumferential direction of the folding roller (10).
13. The folding roller according to claim 12, characterized in that, for receiving the insert (16), the circumferential insert groove (17) has a cross section, which, viewed in radial direction, has a cross section, which decreases towards the outside in axial direction, preferably a trapezoidal cross section.
14. The folding roller according to one of the preceding claims, characterized in that, in axial extension, in addition to a first region (16') comprising a circumferential groove (13) and an insert (16) introduced therein, wherein the conveyor belt or the conveyor belts (21) at least partially wrap around the folding roller (10) in the respective first region (16'), a second region (16") comprising a circumferential groove (13) and a rubber-elastic insert (16) is arranged, so that, in the case the or every insert (16) is worn, for example, the respective conveyor belt (21) can be displaced from the respective first region (16') into the respective second region (16") for minimizing the maintenance efforts.
15. A folding device (1) for formig a fold on a printing material to be folded, wherein, in the case of the folding device (1), a printing material to be folded is pressed by means of a folding knife (3) into an incoming folding roller gap (15) of folding rollers (10) rotating in opposite directions for forming a fold and wherein the printing material folded away is transferred by the folding rollers (10) to a belt line (20), which at least partially wraps around the folding rollers (10), for the purpose of transporting the folded product onward, characterized in that said folding device has at least one folding roller (10) according to one of claims 1 to 14.

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