EP1974897B1 - Device for embossing a number of crease lines into a layer of material - Google Patents

Description

The invention relates to a device for impressing a number of preliminary breaks in a material layer, in particular in a material web having a predetermined width and layer thickness or in a material blank with a predetermined format.

Such pre-fractures impressed into a material layer form fold lines, for example in the production of envelopes, mailing envelopes or packaging articles of a different kind. The material layer used may consist of paper, plastics or other elastically and plastically deformable materials. Usually, such a material layer is present as a web with a fixed predetermined width and layer thickness, or as a blank with a fixed predetermined format. The embossment of a variable number of pre-breaks in such a material layer usually represents one of several process steps of a processing chain. For example, in the production of envelopes, the height of the envelopes is defined by the distance between adjacent preruns. Further processing steps include in particular cutting and folding processes.

In the impression of pre-fractures in a layer of material, this is usually performed by a longitudinal gap between a Vorbruchwalze with two Vorblast knives and rolling against this Vorwalwalze counter roll with elastic sheath. In the course of the rolling motion, the roughing knives generally impress two breaks per revolution of the roughing roll transversely to the direction of rotation into the layer of material, the distance of which corresponds to the circumferential spacing of the roughing knives on the roughing roll. A Such device with a Vorwalwalze and a counter roll is from the DE 196 400 42 A1 known.

For a variation of the Vorbruchabstandes, for example, in a change in the format height for envelopes or shipping bags, the two Vorbruchmesser must be adjusted to each other. For this purpose, one of the roughing knives is fixedly arranged on the Vorwalwalze, while the other Vorbrechmesser is arranged on an adjustable in the Vorbruchwalze segment shell. In this construction, a segment-shaped gap is formed in the Vorwalwalze whose circumferential extent is determined by the difference between the minimum and the maximum of the adjustable circumferential distance of the Vorbrechmesser. Within this gap, the adjustable segment shell is variably positionable. Disadvantageously, this leaves remaining gaps of variable size. These are each filled with further segment elements, so that the Vorwalwalze, on the outer surface of the material web is transported, has a substantially constant in all directions orthogonal to the longitudinal axis radius, and to compensate for an otherwise caused by an adjustment of the segment shell imbalance of the Vorwalwalze. A format change is very (time) consuming due to these construction-related disadvantages.

The object of the invention is to provide a device for impressing a number of Vorbrüchen in a layer of material, with which a format change of the Vorbruchsabstandes is possible with very little effort.

This object is achieved by the features of claim 1. Thereafter, a device for embossing a number of Vorbrüchen in a material layer is specified, comprising a rotatably mounted on a rotary shaft main roller body and a number of embedded in the main roller body holding elements for positioning and / or fixing a first foil sheet with a first pruning edge on the Peripheral surface of the main roller body, which is characterized in that with respect to the longitudinal axis of the rotary shaft angularly rotatable holding device is provided, which holding device for positioning and / or fixing at least one further, second foil sheet is formed with a second cutting edge.

The invention is based on the idea of substituting the direct mechanical connection of the billet knives to the billet roll, which causes the disadvantages of the construction described above, by means of an indirect mechanical coupling. In this case, the billets are formed as a pruning cut on a respective foil sheet, and at least two such foil sheets are arranged mutually adjustable on the peripheral surface of the Vorbruchwalze. In order to achieve such an adjustable arrangement, a Vorbruchwalze is provided with a central main roller body to which one of the foil sheets is attached surface-fitting, and a relative to the main roller body angle-adjustable holding device for a second foil sheet. Thus, by adjusting this holding device, the second foil sheet to the main roller body and attached thereto first foil sheet to form a variable circumferential distance between the Vorbruchschneiden within a limited angular range adjustable.

The holding device is arranged in such a way to the main roller body, that the local distances of both foil sheets in each case in the region of the Vorbruchschneiden to the central longitudinal and rotational axis of the rotary shaft to which the main roller body is fixed, substantially coincide. As a result, the impressing of a variable number of pre-fractures into a material layer can take place by a rotation of the main roller body, wherein the holding device co-rotates with the main roller body at a constant angular rotation. In this construction, the main roller body has no segment-shaped gap and thus has no imbalance in the rotation. For a format change an adjustment of the circumferential distance of Pruning alone by an angular adjustment of the holding device, so that a costly filling of residual segment gaps deleted.

In a preferred embodiment of the device, the holding device comprises two additional roller bodies, which are arranged rotatably mounted on both sides of the main roller body on the rotary shaft. The radii of the additional roller body with respect to the central longitudinal and rotational axes of the rotary shaft are substantially coincident with each other and with the radius of the main roller body with respect to the central longitudinal and rotational axis of the rotary shaft, so that the second foil sheet on the inside at least approximately rests against the peripheral surface of the main roller body. Such a configuration is characterized by a particularly compact and symmetrical shape, which is advantageous for a low-wear use of the device even at higher rotational speeds of the roll body.

In a suitable development of the device, two further additional roller bodies are provided as a holding device for a further foil sheet, which are arranged on both sides of the already existing additional roller body rotatably mounted on the rotary shaft.

The addition of each two additional roll body as a holding device for each additional sheet of foil is iteratively weiterzusbar. In this way, the device may be formed with a plurality of Vorbruchschneiden. As an alternative or in addition, it is possible to provide a number of foil sheets each with a plurality of fixedly spaced pruning cutters. The Vorbruchschneiden can be parallel to the axis straight and / or V-shaped and / or zigzag and / or wave-shaped or adapted to another predetermined contour.

Advantageously, a clamping system and / or a number of magnets is provided, by means of which and / or. by means of which one or each additional roller body is fixable relative to the rotary shaft and thus relative to the main roller body. Such a clamping system and / or such a number of magnets is expediently arranged in the region of the respective end faces of the additional roller body and of the main roller body which are opposite one another.

Furthermore, a scale is preferably provided by means of which a predefined angular adjustment of the or each additional roller body to the main roller body can be performed by a number of fixed predetermined angle. Expediently, the clamping system further comprises a latching device, so that engage with a predetermined number of angular positions of the main roller body to or for each additional roller body, the respective roller body to each other. In this way, a deadlock for certain angles can be simplified.

In a favorable development of the device a number of retaining elements for the purpose of fixing the second foil sheet on the peripheral surface of the respective additional roll body is embedded in the or each additional roll body. In such an embodiment, in particular the connection of the second foil sheet with the or each additional roll body can be realized in an analogous manner as the connection of the first foil sheet with the main roll body. Here, the second foil sheet projects beyond the main roller body at least in partial regions with respect to the longitudinal axis of the rotary shaft for fastening the second foil sheet on the peripheral surface of the respective additional roller body.

As a holding element, a magnetic element is preferably provided. A magnetic element has the advantage that no further mechanical connecting elements are required for the performance of the holding function, since the holding function is provided by the magnetic interaction. Furthermore, the holding function can be destabilized and canceled by exerting a supercritical opposing force, which is advantageous in particular when mechanical elements are stably configured with respect to one another should be under a targeted force but to move each other. Thus, for example, a magnetic element integrated directly in the peripheral surface of the main roller body can perform a holding function for the second film sheet in the stationary state without first having to loosen a mechanical element for subsequent angular adjustment of the foil sheet to the main roller body and readjusting it after the adjustment.

As a further holding element, a pin or pin is expediently provided, which is embedded in the main roller body or in an additional roller body. The longitudinal axis of the pin or pins has to achieve maximum holding stability substantially in a direction orthogonal to the peripheral surface of the respective roller body or radial direction. Such a pen is mainly used to form a configuration application, which should be stable in the regular case against targeted forces, in the device thus in particular for connecting the first foil sheet to the main roll body and for connecting the second foil sheet with one or each additional roll body. Conveniently, the pin or pin is almost completely sunk in the respective roller body, so that it does not or only slightly surmounted the outer surface of the respective foil sheet facing away from the roller body.

In a further embodiment, a number of pins or pins form a pin or pin strip, wherein the pins or pins pass through the respective foil sheet for fixing the same to the corresponding roll body in a groove whose length suitably corresponds to the length of the roll body. In an alternative or additional embodiment, a clamping strip can be provided for fixing the foil sheet to the roll body, which is inserted in a correspondingly formed groove. Such a pin, pin or terminal strip is preferably provided when for forming a stable connection between the foil sheet and the roll body a Variety of holding elements is required, for example, with a sufficient length of the roller body.

Preferably, the first and / or the second foil sheet to form a full-surface or locally planar contact with the peripheral surface of the main roller body or the or each additional roller body is formed in each case correspondingly curved. Thus, the respective foil sheet lies on the inside on the peripheral surface of the main roller body. In such a construction, both foil sheets have a substantially identical radius of curvature in the region of their outer surfaces, so that they form a region of a cylinder jacket surface. This is advantageous for the transport of a material layer, since the material layer can roll off directly on the outer surfaces of the foil sheets without being impaired by a locally irregular surface shape. In addition, just when used in a machine in which the transport of the material web is maintained via a tension roller, by such contouring in a particularly favorable manner, a tension and thus stretching of the web are maintained, so that a particularly constant and reproducible distance between the Vorbrüchen can be complied with.

In an expedient embodiment, the first foil sheet and the second foil sheet have an edge shape designed for reciprocal engagement, mutually corresponding. As a result, the second foil sheet for the first foil sheet with respect to the direction of rotation of the rotary shaft can be variably positioned, at the same time reciprocal engagement of the foil sheets. The interlocking of the foil sheets ensures that, for each adjustment angle between the minimum and maximum circumferential spacing of the scrapers, the outer radius of the roll bodies with the foil sheets resting on the longitudinal axis of the rotary shaft in the area in which the foil sheets abut each other along a line parallel to the longitudinal axis is not consistently reduced by the thickness of the foil sheets. As a result, the material layer transported on the outer surfaces of the foil sheets is in the range held between the Vorbruchschneiden of a constant maximum outer radius, which is reduced at most in localized areas. As a result, an advantageously smooth contact of the material layer is achieved, while avoiding unwanted deformations.

In a suitable development, the first foil sheet and the second foil sheet have an interlocking toothing. Such a design is easy to manufacture and is characterized by its regularity.

In a further preferred embodiment variant of the apparatus, the main roller body and / or one or each additional roller body each have suction air zones with a number of suction air openings opening into the respective peripheral surface, which are designed for coupling to a system for drawing in air.

Such a suction air zone serves, in particular, for an adhesion of a material blank uniformly distributed over a partial area of the peripheral surface of the or each roller body, in order to keep the material blank stably in the course of impressing preliminary breaks, and for defined transport of the material blank in the machine. In the case of a material web, on the other hand, the holding function on the or each roll body is eliminated, since the holding function is exerted externally and / or over the material web itself. The suction air zone is arranged, in particular, in a region of the or each roll body which lies in a region leading with respect to the direction of rotation of the rotary shaft to the region in which the film sheets are arranged circumferentially adjacent. An overlapping of both areas is possible, in which case the film sheet arranged in each case in a region of the suction air zone has a number of passage openings for the suction air openings located on the underside of the sheet.

For example, in the manufacture of an envelope, an end portion of the blank forming the bottom flap of the envelope is held in the region of the suction air zone by a negative pressure in the suction air openings created by the suction of air. During a rotation of the roller bodies, the region of the blank trailing with respect to the direction of rotation of the rotary shaft is thereby pulled over the outer surfaces of the foil sheets. In the course of the rotation of the roller body against an elastically sheathed counter roller, the Vorbruchmesser shape two pre-fractures in the blank. The pre-breaks define the so-called format level of the future envelope, since its height is determined by the distance of the pre-breaks.

In an expedient embodiment of the device, the main roller body and / or the or each additional roller body has a diameter in a range of about 60 mm to about 300 mm. Such an embodiment of the device is used in particular in the processing of material webs application, for example in paper webs.

In a further preferred embodiment of the device, the main roll body and / or the or each additional roll body has a diameter in a range of about 100 mm to about 300 mm. Such an embodiment of the device is used, in particular, in the processing of material blanks, for example in the case of paper blanks in the course of the production of envelopes, mailing envelopes or the like.

Fig. 1

die in einer Längsaufsicht dargestellte Vorrichtung,

Fig. 2

die Vorrichtung gemäß Fig. 1 in einer Querschnittsdarstellung mit Materialbahn und elastischer Gegenwalze,

Fig. 3

einen Querschnitt der Hauptwalze einer weiteren erfindungsgemäßen Vorrichtung mit Saugluftöffnungen, und

Fig. 4

einen Querschnitt einer weiteren Hauptwalze mit Saugluftöffnungen.

In the following, an embodiment of a device according to the invention for impressing a number of pre-fractures into a material layer is explained with reference to a drawing. Show

Fig. 1

the apparatus shown in a longitudinal view,

Fig. 2

the device according to Fig. 1 in a cross-sectional view with Web and elastic counter roll,

Fig. 3

a cross section of the main roll of another device according to the invention with Saugluftöffnungen, and

Fig. 4

a cross section of another main roll with Saugluftöffnungen.

Corresponding parts in different figures are provided with the same reference numerals.

In Fig. 1 the device 1 is shown in a longitudinal view. One of the device 1 associated mating roll with elastic sheath has been omitted in this illustration. The main roller body 2 is rotatably positioned on a driven rotary shaft 3. On the circumferential surface 4 of the main roller body 2, a first foil sheet 5 is fixed with a first pruning blade 6 arranged thereon. The scoring blade 6 is aligned parallel to the central longitudinal axis 7 of the rotary shaft 3. The positioning and fixing of the first foil sheet 5 by means of a number of embedded in the peripheral surface 4 magnetic elements 8 and 9 by means of pins which engage through a parallel to the central longitudinal axis 7 groove 10. In a further development of the embodiment, a plurality of pins 9 may be provided which form a pin bar in the groove 10. As an alternative to the pins 9, a terminal strip can also be used, which can be inserted into the groove 10.

Furthermore, a second foil sheet 11 is formed, which is designed to be slightly wider than the first foil sheet 5 with respect to the direction of the longitudinal axis 7 and which thus projects beyond the main roll body 2 on both sides by the same length amount 12. The second film sheet 11 is by means of a respective further pin 9a on each one additional roller body 13, which is arranged rotatably mounted in each case with respect to the longitudinal axis 7 end side of the main roller body 2 on the rotary shaft 3, fixedly positioned. On the second foil sheet 11th a arranged parallel to the longitudinal axis 7 second cutting edge 14 is arranged, the circumferential distance 15 is seen to the first scorching edge 6 here in the projection on the plane of the drawing. In the circumferential surfaces 16 of the two additional roller body 13 more magnetic elements 8a are embedded, which hold the second foil sheet 11 in addition to the pins 9a. Since the second foil sheet 11 also concentrically surrounds the circumferential surface 4 of the main roller body 2, it is additionally held by the magnetic elements 8, but an angular rotation of the second foil sheet 11 about the longitudinal axis 7 relative to the main roller body 2, caused by a similar angular rotation of the additional roller body 13th with respect to the rotary shaft 3, not prevent. By such an angular rotation of the circumferential distance 15 between the first pruning edge 6 and the second pruning blade 14 between the minimum distance position shown here, in which the two end edges 17 and 18 of the first and second foil sheet 5 and 11 face the front side, and a maximum distance position varies. The shapes of the two end edges 17 and 18 form a formed for mutual engagement of the two foil sheets 5 and 11, rectangular teeth. The maximum distance position is characterized in that just no continuous gap between the foil sheets 5 and 11 is cleared parallel to the longitudinal axis 7 on the peripheral surface of the main roll body. As a result, a material layer is continuously transported on the surfaces of the two sheets 5 and 11, without the material layer would be affected by a continuous gap.

Fig. 2 shows the device 1 according to Fig. 1 in a cross-sectional view in the region of the main roller body 2. In this illustration, an elastic coated counter-roller 19 is shown, which rotates in the direction of rotation 20 of the rotary shaft 3 inverse direction of rotation 21, whereby between the main roller body 2 and the counter-roller 19, a material layer 22 is transported. Visible are the first and the second foil sheet 5 and 11 and respectively arranged thereon Vorbruchschneiden 6 and 14. The illustration shows a snapshot temporally Immediately before the impressing of a first advance into the material layer 22 by the first pruning cutter 6. Furthermore, a relative to the plane of representation vertically offset, to the main roller body 2 radially aligned and almost completely sunk in this pin 8 is shown. With the help of the pin 8, the first foil sheet 5 is fixed to the main roller body 2. Another pin 8a fixes in a similar manner, the second film sheet 11 to one of the additional roller body, which is arranged with respect to the vertical plane to the representation plane end to the main roller body 2 and not visible here. Further visible are the two frontally opposite end edges 17 and 18 of the first and the second foil sheet 5 and 11, and with respect to the direction of rotation 20 leading end edge 23 of the first foil sheet 5 and the trailing edge 24 of the second foil sheet 11 with respect to the direction of rotation 20 ,

Fig. 3 shows a cross section of the main roll 2 of a further device 1 according to the invention with Saugluftöffnungen 25, which are embedded in a suction air zone 26 in the leading with respect to the direction of rotation 20 to the first foil sheet 5 on the peripheral surface of the main roller body 2. By sucking in air from the respective side channels 27 connected to the suction air openings 25, a negative pressure is generated in the area of the suction air zone 26, by means of which a material blank is held on the main roll body 2 while the main roll body 2 rotates. Further details of the representation correspond to those in Fig. 2 and are Fig. 2 removable.

Fig. 4 shows a cross section of the main roll 2 of another device 1 according to the invention with Saugluftöffnungen 25 analogous to Fig. 3 Here, the suction air zone 26 is completely surrounded by the first foil sheet 5. The first film sheet 5 has passage openings 28 designed as elongated holes for the suction air openings 25. Further details of the representation correspond to those in Fig. 3 and are Fig. 3 removable.

LIST OF REFERENCE NUMBERS

1

contraption

2

Main roller body

3

rotary shaft

4

Peripheral surface of the main roller body

5

first foil sheet

6

first pruning edge

7

central longitudinal axis of the rotary shaft

8th

magnetic element

8a

another magnetic element

9

Pin code

9a

another pin

10

groove

11

second foil sheet

12

length amount

13

Additional roll body

14

second pruning edge

15

circumferential distance

16

Peripheral surface of an additional roller body

17

End edge of the first foil sheet

18

End edge of the second foil sheet

19

backing roll

20

Direction of rotation of the rotary shaft

21

inverse direction of rotation

22

material layer

23

leading end edge of the first foil sheet

24

Trailing end edge of the second foil sheet

25

suction air

26

Saugluftzone

27

side channel

28

Port

Claims (12)

1. A device (1) for stamping a plurality of pre-folds into a material layer (22), comprising a main roll body (2) arranged on a rotary shaft (3) in a torque-proof manner and a plurality of holding elements (8, 9) embedded in the main roll body (2) for positioning and/or fixing a first foil metal sheet (5) having a first pre-fold edge (6) on the peripheral surface (4) of the main roll body (2),
   characterized in that
   a holding device (13) is provided which is angularly rotatable about the longitudinal axis (7) of the rotary shaft (3) and which is designed for positioning and/or fixing at least one additional second foil metal sheet (11) having a second pre-fold edge (14).
2. The device (1) of claim 1,
   characterized in that
   the holding device (13) comprises two supplementary roll bodies (13) which are arranged on both end sides of the main roll body (2) and are carried in a rotarily adjustable manner on the rotary shaft (3).
3. The device (1) of claim 2,
   characterized in that
   a or each supplementary roll body (13) can be fixed relative to the rotary shaft (3) by means of a clamping system and/or by means of a plurality of magnets in the region of the covering surfaces of the supplementary roll body (13) and the main roll body (2), which are in each case located opposite one another on the end faces.
4. The device (1) of claim 2 or 3,
   characterized in that
   a plurality of holding elements (8a, 9a) are embedded in the or each supplementary roll body (13) for fixing the second foil metal sheet (11) on the peripheral surface (16) of the or each supplementary roll body (13).
5. The device (1) of any of claims 1 to 4,
   characterized in that
   a magnet element (8, 8a) is provided as holding element (8, 8a, 9, 9a).
6. The device (1) of any of claims 1 to 5,
   characterized in that
   a pin (9, 9a) is provided as holding element (8, 8a, 9, 9a), the longitudinal axis of said pin (9, 9a) being oriented substantially radially to the zur peripheral surface (4) of the main roll body (2) or of a supplementary roll body (13).
7. The device (1) of claim 2 and according to any of the preceding claims,
   characterized in that
   a clamping strip is provided for positioning and/or fixing the first foil metal sheet (5) or the second foil metal sheet (11) on the main roll body (2) or on a or each supplementary roll body (13).
8. The device (1) of claim 2 and according to any of the preceding claims,
   characterized in that
   the first and/or the second foil metal sheet (5, 11) are in each case curved in correspondence with the main roll body (2) or the or each supplementary roll body (13), in order to form a contact over the entire surface or over a local surface with the peripheral surface (4, 16) of said main roll body (2) or the or each supplementary roll body (13).
9. The device (1) of any of claims 1 to 8,
   characterized in that
   the first foil metal sheet (5) and the second foil metal sheet (11) have end-edge shapes (17, 18) which are in each case in correspondence with each other, whereby the second foil metal sheet (11) can variably be positioned relative to the first foil metal sheet (5) with regard to the direction of rotation (20) of the rotary shaft (3), the foil metal sheets (5, 11) mutually engaging at the same time.
10. The device (1) of claim 9,
    characterized in that
    the first foil metal sheet (5) and the second foil metal sheet (11) have a tooth system designed for engagement.
11. The device (1) of any of claims 1 to 10,
    characterized in that
    the main roll body (2) and/or a or each supplementary roll body (13) have in each case a plurality of suction-air openings (25) which open into the respective peripheral surface (4, 16) and which are designed for being coupled to an air-sucking system.
12. The device (1) of any of claims 1 to 11,
    characterized in that
    the main roll body (2) and/or the or each supplementary roll body (13) have a diameter in the range from 60 mm to 300 mm.

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