DE202019101582U1 - folding roller - Google Patents

Abstract

Folding roller (1) for folding paper sheets in a folding unit (2) with a roller core (11) and a coating applied thereto (10), characterized in that the coating (10) is made of a nitrile rubber.

Description

The invention relates to a folding roller for folding paper sheets in a folding unit with a roller core and a coating applied thereto.

A folding roller of this kind is in the DD 274 606 A1 specified. Such folding rollers are used in folding units of folding machines. This known folding roller has, as usual in conventional folding rollers of this type, alternately circumferentially applied corrugated metal strips and strips of elastic material on a metallic core, which slightly project beyond the surface of the metal strip. In order for the user of the folding rollers to be able to restore their full functionality in the event of partial wear, it is provided in this known folding roller that metal rings which are grounded on the ground metallic roller core and are ground inside the inner diameter and on the side surfaces are axially braced against each other to form a rotationally fixed unit. wherein the ground metal rings preferably have on a side surface a shoulder which serves as a seat for a ring of metallic material. Although in this way the user himself can restore the functionality of the folding roller according to the object, however, this is difficult because of the required high precision and time and material, especially since a plurality of folding rollers are installed in folding machines.

The DD 228 519 B5 shows the use of folding rollers in pocket folding machines with a device for adjusting the folding mechanism geometry. No details are given about the structure of the folding rollers per se.

Also the DE 10 2014 007 495 A1 shows a folding roller for use in a folding device, wherein the folding roller has in the region of cooperating with them conveyor belts of a strip line at least one rubber-elastic insert, which are introduced into associated grooves in the Falzwalzenkörper. This is intended to reduce 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.

The DE 10 2013 019 400 A1 shows a Taschenfalzstation a Bogenfalzmaschine with a plurality of folding rollers, wherein at least one folding roller in the region of its lateral surface provided with at least one bearing element, wherein a support member is supported on the bearing element.

Other folding rollers in connection with folding devices show the DE 10 2006 031 983 B3 and the DE 297 22 173 U1 ,

It is known that in conventional folding rollers, either polyurethane rings or spiral polyurethane are glued into already prefabricated recesses of the roller body. Between the glued-in polyurethane are knurled sections of metal, which can repeatedly cause marks (impressions) on the substrate such as paper. These folding rollers can - which must be made by the manufacturer or supplier - only once or twice reground, since the metal core of the roll is always reduced by grinding on the diameter. Thus, the core is eventually too small and the rollers fall out of the range to be adjusted, which is needed for exact guidance of the sheets to be folded. It is also necessary to frequently clean the coating of the folding roller to avoid contamination and to maintain an exact function on its surface, which requires special, cost-intensive cleaning agents in order to minimize the durability of the polyurethane as little as possible.

The present invention has for its object to provide a folding roller of the type mentioned, which or gives an increased wear resistance with the best possible function.

This object is achieved in the folding roller with the features of claim 1.

With these measures, as has been shown in studies of the inventor, a significant extension of the service life of the folding rollers compared to previous folding rollers achieved. Also results in a much improved resistance to damage by cleaning agents in comparison z. B. to previous polyurethane coatings. Therefore, conventional cleaning agents can advantageously be used for the cleaning. In addition, the coating can achieve a consistently high folding accuracy. Also, the costs for the production or renewal of the coating in relation to conventional folding rollers are low.

According to the invention, it has proved to be particularly favorable for achieving the above advantages that a XNBR material is selected as the nitrile rubber.

To achieve an advantageous function with high folding accuracy and favorable production or renewal of the coating, the measures contribute to the fact that the roll core in the coating area is coated over its entire area without interruption in the axial direction. Also, by the full surface coating on the substrate to be processed or paper no marks (impressions) caused by knurled parts of metal. After wear of the coating, this can be renewed as often as desired.

If it is further provided that the coating is provided with a circumferential grooving, color and powder or the like of the printing material can be thrown out of the folding unit by rotation.

In this case, it is furthermore advantageous that the grooving runs obliquely, at least in sections, with respect to a cross-sectional plane perpendicular to the roll axis, in particular in the form of cross-grooving.

Further advantages for the function and cleaning result from the fact that the grooving in cross-section has outwardly steadily opening, in particular trapezoidal or V-shaped with a circular groove bottom formed grooves. By thus introduced, opening outwards in cross-section, in particular trapezoidal or rounded depressions prevents accumulating particles settle in the wells.

For a cost-effective production of the folding roller is advantageously provided that a coating material is made of nitrile rubber and provided and that the coating material is wound in tough consistency on the roll core and then cured.

For the production and function of the measures are advantageous that introduced into the hardened coating material grooving with circumferentially extending grooves, in particular ground.

A further advantageous measure for processing and an exact function is that the hardened coating material is ground to size prior to incorporation of the grooving.

Furthermore, it is advantageously provided for the production and renewal of the coating as well as the function that the coating material is applied to the roll core over its full area without interruption in the direction of the roll axis.

The folding rollers provided with the above-mentioned inventive measures can be installed in any conventional folding machine.

• 1 ein Falzwerk mit mehreren Falzwalzen und Falztaschen in schematischer seitlicher Ansicht,
• 2 einen Abschnitt einer Falzwalze in Seitenansicht,
• 3A einen Abschnitt einer Falzwalze im Längsschnitt,
• 3B ein Detail X der Falzwalze nach 3A im Bereich einer Beschichtung und
• 4 einen Querschnitt einer Falzwalze.

The invention will be explained in more detail by means of embodiments with reference to the drawings. Show it:

• 1 a folding unit with several folding rollers and folding pockets in a schematic side view,
• 2 a section of a folding roller in side view,
• 3A a section of a folding roller in longitudinal section,
• 3B a detail X of the folding roller after 3A in the area of a coating and
• 4 a cross section of a folding roller.

1 schematically shows a folding unit 2 with six folding rollers 1 ( 1a . 1b . 1c . 1d . 1e . 1f ) with in between in the passage way of a sheet inlet e up to an arch discharge ( A ) arranged on alternate sides folding pockets 21 as known from the prior art in pocket folders. The folding pockets have a shaft 210 and a stop 211 for the substrate or paper during the folding operations on.

2 shows a section of a folding roller according to the invention 1 with a grooving 101 in a coating surface 100 , Like the others 3A . 3B and 4 show, points the folding roller 1 a usually metallic roll core 11 with a coating applied thereto 10 on, in their coating surface 100 the grooving 101 is incorporated. For example, the thickness a of the coating is 10 in the range between 3 and 6 mm, such as between 4 and 5 mm. In this case, the roll core 11 z. B. a diameter d1 between 30 and 40 mm, such as. B. 35 mm, so that z. B. an overall diameter d2 the folding roller between 38 and 50 mm at a thickness t of the coating 10 between 4 and 5 mm.

The grooving 101 consists of in the circumferential direction of the folding roller 1 in the coating surface 100 introduced grooves which are preferably (but not necessarily) to a cross-sectional plane perpendicular to the roll axis oblique and formed, for example, as Kreuzrillierung, as shown 2 seen. The grooves are in their cross section (in side view of the folding roller 1 ) widening towards the outside, as shown in the enlarged view of 3B seen. In this case, the groove shape may be trapezoidal, V-shaped with a rounded base or trough-shaped, wherein the opening angle α of the grooves z. B. in the range between 30 ° and 70 °, such. B. 45 ° and 65 °, in particular between 50 ° and 60 °. The depth t is preferably between 1 and 3 mm, in particular between 1.2 and 2 mm, preferably between 1.4 and 1.6 mm. Through this training of grooving 101 deposited dirt particles are advantageously discharged or the folding roller 1 can be easily cleaned, as stated at the beginning.

The coating 10 is over the entire axial extent of the entire surface of the roll core 11 applied, with lateral, beyond the coating area extending portions, as usual, with bearing parts for insertion into a respective folding unit 2 is designed. The full-surface formation of the coating 10 gives advantages for the production and a possible reworking or renewal of the coating 10 ,

According to the invention as a material for the coating 10 a nitrile rubber, especially an XNBR material used as a subspecies of NBR material, which has a tough consistency. It is preferably on the roll core 11 the folding roller 1 wound and then cured, especially in an oven or convector. After cooling, the coating is still ground to size and with the grooving 101 preferably provided by grinding. Due to this design of the folding roller 1 with the coating 10 , which is formed in particular all over the surface and grooved in the above manner, a high mechanical and chemical resistance, in particular against damage caused by cleaning agents. In addition, the coating can 10 be renewed as often as desired and results in a high folding accuracy. Markings by knurled parts between portions of the coating as in conventional folding rollers are avoided. By incorporated in accordance with the invention grooving is prevented in contrast to conventional folding rollers with paraxial grooving that accumulate particles such as paint and powder of the substrate set in the grooving because dirt particles are ejected by the rotation.

The material used for the coating 10 has z. B. a hardness between 50 and 90, in particular between 60 and 80 Shore A and a high tensile strength of z. B. between 10 and 25 N / mm ² , in particular between 15 and 20 N / mm ² , and an elongation at break, in particular in the range between 500 and 550% (both properties measured according to DIN 53504). Further properties of a coating tested according to the invention 10 of this material are an elasticity between 30 and 50% (according to DIN 53512) and an abrasion in the range between 50 and 80 mm ³ , in particular between 60 and 70 mm ³ (according to DIN ISO 4649).

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DD 274606 A1 [0002]
• DD 228519 B5 [0003]
• DE 102014007495 A1 [0004]
• DE 102013019400 A1 [0005]
• DE 102006031983 B3 [0006]
• DE 29722173 U1 [0006]

Claims (6)

Folding roller (1) for folding paper sheets in a folding unit (2) with a roller core (11) and a coating applied thereto (10), characterized in that the coating (10) is made of a nitrile rubber. Folding roller after Claim 1 , characterized in that as Nitrilkautschuk an XNBR material is selected. Folding roller after Claim 1 or 2 , characterized in that the roller core (11) in the coating area over the entire surface is coated without interruption in the axial direction. Folding roller according to one of the preceding claims, characterized in that the coating (10) is provided with a circumferentially extending grooving (101). Folding roller after Claim 4 , characterized in that the grooving (10) extends at least partially obliquely with respect to a plane perpendicular to the roll axis cross-sectional plane, in particular in training as Kreuzrillierung. Folding roller after Claim 4 or 5 , characterized in that the grooving (10) has in cross-section outwardly steadily opening, in particular trapezoidal or V-shaped with a circular groove bottom formed grooves.

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