EP1254025A1

EP1254025A1 - Guiding device for metal sheet printing machines and metal sheet painting machines

Info

Publication number: EP1254025A1
Application number: EP01991747A
Authority: EP
Inventors: Hans Beger; Harald Klotz; Otto Kunzi
Original assignee: Bauer and Kunzi Gesellschaft fur Drucktechnik mbH
Current assignee: Bauer and Kunzi Gesellschaft fur Drucktechnik mbH
Priority date: 2000-11-22
Filing date: 2001-11-21
Publication date: 2002-11-06
Anticipated expiration: 2021-11-21
Also published as: CA2428963A1; US6862985B2; US20040065218A1; IL155984A0; DE50115134D1; WO2002042076A1; ATE444169T1; MA25888A1; AU2002231634A1; EP1254025B1; ES2332356T3

Abstract

The invention relates to a guiding device for metal sheet printing machines and metal sheet painting machines, which have at least two printing cylinders and a transfer drum situated therebetween. The guiding device is arranged on said transfer drum and, to be precise, is located close to the imaginary cylindrical outer surface of the transfer drum. The guiding device comprises at least one guiding element with an outwardly turned bearing surface for supporting the rear edge of the metal sheets. The guiding element is pivotally mounted by means of a swivel bearing whose pivotal axis is parallel to the axis of the transfer drum. The guiding element is coupled to a pivot drive by means of which its bearing surface can be adjusted to different pivoting angles (beta) with regard to the tangent to the imaginary cylindrical outer surface of the transfer drum. This pivoting angle (beta) is larger at the rotating position of the transfer drum at which the rear edge of the metal sheets rest against the guiding element, and is smaller at the rotating position at which the rear edge of the metal sheets leave the guiding element.

Description

Guide device for sheet metal printing machines and sheet metal painting machines

Sheet metal printing machines and sheet metal coating machines are used for printing or painting metal sheets, from which, after printing and / or painting, cans for packaging purposes, lids for these cans or for glasses, closures for bottles or similar items made of thin sheet metal are produced , These metal sheets are referred to below as sheet metal sheets. The printing machines and coating machines are also used for printing and / or painting boards made of other materials, e.g. made of plastic, used.

In these machines, a series of printing cylinders and transfer drums follow one another. In some machines, the axes of these cylinders and drums are approximately at the same height. In other machines, the axis of the transfer drums is lower than that of the printing cylinders.

The printing cylinders have a largely closed cylindrical surface. The transfer drums, however, preferably consist of a tubular drum core of smaller diameter, on which some components are arranged, which rotate with the drum core. The outermost cylindrical movement path of these components defines an imaginary cylindrical outer surface of the transfer drums, to which part of the following explanations refer.

Both in the printing cylinders and in the transfer drums, grippers are arranged at a certain circumferential location, which grip the front edge of the metal sheets to be printed or painted and take them with them. Such grippers are not available for the rear edge of the metal sheets. As they pass through the printing press, the metal sheets are transferred from the printing cylinder to the transfer drum and from there to the printing cylinder. They are gripped by the assigned grippers at their front edge section and conveyed on from one transfer point to the next. The metal sheets change their curvature.

When circulating with the printing cylinder, which is actually to be referred to as the impression cylinder, the metal sheets rest on the back of the printing cylinder. The metal sheets are guided by passing them through the narrow gap between the printing cylinder and a rubber cylinder, which transfers the printed image with a specific color to the front of the metal sheets facing it.

When circulating with the transfer drum, the metal sheets are guided on their rear side by guide strips which are arranged at a certain distance from the imaginary surface area, the transfer drum. These guide strips extend over a peripheral region of the transfer drum, which is smaller than the peripheral region between the first and the second transfer point of the transfer drum.

At the transition of the metal sheets from the transfer drum to the next printing cylinder, from a certain distance of the metal sheets, their rear longitudinal section is no longer in contact with the guide strips on the one hand and not yet with the printing cylinder on the other hand. This leads to the fact that the metal sheets become unstable and tend to vibrate outside their clamped front edge area under the action of internal and external forces, such as elasticity and inertial forces. These appearances occur with printing presses whose axes are at the same height.

In order to at least reduce these vibrations, it is known (EP 0 752 310 B1) on the transfer drum

Attach guide elements, which are arranged in the end area of the metal sheet so that the rear edge of the metal sheet can rest on it. For this purpose, these guide elements have a contact surface which has a certain, fixed, inclination angle with respect to the tangent to the lateral surface of the transfer drum.

Since the guide element moves away from the metal sheet in its circular movement path, the angle of inclination changes between its contact surface and the rear end section of the metal sheets. During the transition of the metal sheets from the transfer drum to the next printing cylinder, it can therefore occur due to the vibrations occurring in the metal sheet and due to the instability of its rear longitudinal section that not only the end edge of the metal sheets, but its entire end section and thus the end section of the printed area on the Contact surface of the guide element rests and that the print image is smeared thereby.

This error can occur more intensely on printing machines with a height offset of the axes of the printing cylinders and the transfer drums. This smearing of the printed image may make the metal sheets unusable.

The invention has for its object to provide a guide device for sheet metal printing machines and sheet metal coating machines, in which the smearing of the printed image in the rear end region of the metal sheets at least diminished, if not avoided at all. This object is achieved by a guide device with the features of claim 1.

Because the guide element is pivotably mounted by means of a pivot bearing with a pivot axis aligned parallel to the axis of the transfer drum and the inclination of its contact surface can be changed by means of a pivot drive, the contact surface can be better adjusted to the angular position of the end section of the metal sheets, so that only the The rear edge of the metal sheets lies against the guide surface, but no longer the rear end section thereof. As a result, the risk of smearing of the printed image at the rear end section is at least considerably reduced, if not entirely eliminated.

With the design of the guide device according to claim 2, a particularly favorable angular range for the pivoting movement of the contact surface is specified.

In an embodiment of the guide device according to claim 3, the contact of the metal sheets on the guide element is limited to the ridge edge in the case of a roof-shaped arrangement of the surface sections and to the two outer longitudinal edges of the guide element in the case of a dovetailed arrangement of the surface sections.

Similarly, in an embodiment of the guide device according to claim 4, the contact of the metal sheets on the guide element is limited to the lateral longitudinal edge thereof.

An embodiment of the guide device according to claim 5 ensures that even with wider metal sheets, the rear edge thereof only abuts one side edge of the guide elements, even if the Sheet metal sheets are concave or convex in their transverse direction under the effect of their own weight and / or their inertial forces.

By designing the guide device according to claim 6, the guide elements can be easily adjusted to different widths of the metal sheets.

With an embodiment of the guide device according to claim 7, the pivotable guide elements can be adjusted in the circumferential direction to different lengths of the metal sheets, their adjustment in the circumferential direction generally being related to the circumferential location of the grippers which grip the metal sheets at the front edge section.

By designing the guide device according to claim 8, the swivel drive for the guide element can be made relatively simple. This applies in particular to one of the further developments of the guide devices according to claim 9.

With an embodiment of the guide device according to claim 10, the adjustment of the inclination of the contact surface can be adjusted even better to the movement conditions and elastic deformations of the rear longitudinal section of the metal sheets. This applies in particular to the developments according to claim 11 and / or claim 12. A further optimization of the setting of the contact surface of the guide element can be achieved with a configuration of the guide device according to claim 13.

Is In one embodiment of the guiding device according to Anspruch- 14, wherein the guide element is itself ^{'hergesttellt} of a vibration-damping material or to domestic least provided with a vibration-damping layer, the vibrations of the metal sheets are reduced at least in the area of their rear edge. This has a calming effect on the metal sheet as a whole and also contributes to the fact that the risk of smearing of the printed image at the rear end section is at least considerably reduced, if not completely eliminated.

In an embodiment of the guide device according to claim 15, an abrasive effect is at least greatly reduced by the rear edge of the metal sheets on the contact surface of the guide element, which can result from the fact that, due to the geometric conditions and the material properties, the rear edge of the metal plates are located on the contact surface of the guide elements moved along, and in that the metal sheets usually through the

Cutting off a coil has a sharp burr and this can cause severe wear on the contact surface of the guide element. By designing the guide device according to claim 16, this abrasive effect on the contact surface, particularly on those guide elements which are either themselves made of a vibration-damping material or whose guide element is provided with a vibration-damping layer (84), is greatly reduced are.

A particularly good vibration-damping effect is achieved by designing the guide device according to claim 17. The wear of the guide element is particularly greatly reduced by designing the guide device according to claim 18.

The invention is explained in more detail below on the basis of exemplary embodiments illustrated in the drawing. Show it: Figure 1 is a schematically illustrated elevation of part of a sheet metal printing machine with a guide device for the rear edge of the sheet metal. 2 shows a side view, or a front view, and 3 shows a first exemplary embodiment of the guide device with a guide element; Fig. 4 is a side view and a front view of a and 5 second embodiment of the guide device with a guide elements.

Fig. 6 is a side view and a front view of a and 7 second embodiment of the guide device with a guide elements. 8 shows a front view of a fourth exemplary embodiment of the guide device with two

Guide elements. 9 is a side view of a modified guide element; Fig. 10 is a side view of a further modified ^~, guide element;

11 shows an enlarged cross section of the guide element according to FIG. 10.

A part of a sheet metal printing machine 10 can be seen in a highly schematic illustration from FIG. This part of the printing press 10 has two so-called impression cylinders 11 and 12, which function as impression cylinders. The axis 13 of the printing cylinder 11 and the axis 14 of the printing cylinder 12 are aligned parallel to one another and are at the same height. Each of the printing cylinders 11 and 12 works together with a rubber cylinder 15 and 16, respectively, from which the print image is transferred in a specific color to the metal sheets which are between the printing cylinder and the associated rubber cylinders are passed through. For this purpose, the pressure cylinders 11 and 12 have grippers (not shown) which, at a transfer point (also not shown), grip the sheet metal sheets fed in at their front edge and carry them with them to the next transfer point.

Between the two adjacent printing cylinders 11 and 12 there is a transfer drum 17, the axis 18 of which is aligned at least approximately parallel to the axes 13 and 14. The axis 18 of the transfer drum 17 lies a predetermined amount below the axes 13 and 14.

Unlike the pressure cylinders 11 and 12 with a closed cylindrical surface, the transfer drum 17 has only one tubular drum core 19 which is delimited from an imaginary cylindrical lateral surface 21 at a predetermined radial distance. Apart from some components which are arranged on the outside of the drum core 19, the space between the drum core 19 and the imaginary outer surface 21 is empty.

Below the transfer drum 17 there are arranged guide strips 22 which have a predetermined distance from the imaginary surface line 21 of the transfer drum 17, which distance can be set. The guide strips 22 extend over a circumferential area of the transfer drum 17 which is smaller than the circumferential area which extends from the first transfer point 23 to the second transfer point 24 of the metal sheets, of which the first transfer point 23 at the imaginary contact point between the printing cylinder 12 and the transfer drum 17 is located and of which the second transfer point 24 is located at the imaginary contact point between the transfer drum 17 and the second pressure cylinder 11. The transfer drum 17 is equipped with a plurality of grippers 25 which are arranged on a common carrier 26 which is rigidly connected to the drum core 19. The grippers 25 are arranged in the vicinity of the imaginary outer surface 21 of the transfer drum 17 at a circumferential location which is matched to the circumferential location of the grippers on the pressure cylinders 11 and 12.

As they pass through the printing press, the metal sheets 30 are transferred from the printing cylinder 12 to the transfer drum 17 and from there to the printing cylinder 11. They are gripped by the assigned grippers at their front edge section and conveyed on from one transfer point to the next. The metal sheets 30 change their curvature in sections. As a result, the metal sheets 30 outside their clamped initial area under the action of internal and external forces, e.g. elasticity and inertial forces tend to perform their own movements. In order to at least partially absorb these self-motions, guide elements 31 are arranged on the transfer drum 17. These have a contact surface 32 on which the rear edge 33 of the metal sheets 30 can rest and are guided thereby. The guide elements 31 are each arranged on a holder 34. They are pivoted thereon by means of a pivot bearing 35 about a pivot axis which is aligned parallel to the axis 18 of the transfer drum 17. The guide elements 31 are coupled to a swivel drive, not shown in FIG. 1, by means of which the angle of inclination β of the contact surface 32 relative to the

Tangent 36 of the lateral surface 21 of the transfer drum 17 can be changed.

The size range of the swivel angle ß is between 75 ° and 5 °. As can be seen from Fig. 1, the swivel angle ß a larger angular value in the area of that point of the circular movement of the guide element 31 at which the rear edge 33 of the metal sheets 30 bears against the guide element 31 when its curvature changes, and a smaller angle value in the area of that point of the circular movement of the guide element 31 at which the rear edge 33 of the metal sheets 30 releases from the guide element 31 again. At the former point, the guide element 31 and the parts connected to it are shown in solid lines. At the latter point, the guide element 31 and the parts connected to it are shown in broken lines. The grippers 25 and the parts connected to them are shown in the same way.

The holder 34 for the guide element 31 is on one

Carrier 37 is arranged, which is connected to the drum core 19 in such a way that the holder 34 can be pivoted on an arc-shaped movement path about the axis 18 of the transfer drum 17 and can be adjusted to a specific circumferential position by means of an adjusting device. This circumferential point depends on the length of the metal sheets 30 and is related to a fixed circumferential point on the transfer drum 17, which is predetermined by the grippers of the transfer drum 17.

2 and 3, the holder 34 can be seen in more detail, on which the guide element 31 is pivotably mounted by means of the pivot bearing 35. The guide element 31 is designed in the form of a strip. It has a given length. It is dimensioned so large that the rear edge 33 of the metal sheets 30 can also rest against it when the metal sheets are of different lengths and / or different elasticities.

The pivot bearing 35 is arranged in the vicinity of one end of the guide element 31. Near the other At the end, a swivel drive 38 is coupled. A swivel drive is shown in the form of a pneumatic or hydraulic piston drive, the cylinder of which is accommodated in the holder 34 and connected to it in an articulated manner and the piston rod 39 is articulated to the guide element 31.

The swivel drive 38 has two end positions, of which the one swivel position with the larger swivel angle β is shown in solid lines and the swivel position with the smaller swivel angle β is shown in broken lines. Instead of a hydraulic or pneumatic piston drive, an electromagnet can also be used as the drive, which then also has two end positions.

The setting of the guide element 31 to the larger swivel angle β takes place in a region of the circulating movement of the transfer drum 17 which is located a sufficient distance in front of the circumferential point at which the rear edge 33 of the metal sheets 30 bears against the 'guide element 31'. The position of this circumferential location depends on several circumstances, in particular on the length of the metal sheets 30, by which the change in curvature in the rear longitudinal section of the metal sheets 30 is determined. As a result of this change in the curvature of the metal sheets 30, the rear edge 33 of the metal sheets 30 is lifted off from the guide strips 22 and placed on the guide element 31.

The setting of the guide element 31 to the smaller swivel angle β takes place in a region of the circulating movement of the transfer drum 17, which is located between the two circumferential points at which the rear edge 33 of the metal sheets 30 lies against the guide element 31 and on which the rear edge 33 of the Metal sheets 30 differ from the guide ment 31 solves again. Since the last-mentioned circumferential location depends very much on the length and the physical properties of the metal sheets, it must be determined empirically.

In the following exemplary embodiments, it can be assumed that components and assemblies that are not explained separately are the same or at least similar to those of the components and assemblies described above.

In the embodiment shown in FIGS. 4 and 5, a guide element 41 is pivotally mounted on the holder 34 by means of the pivot bearing 35, the contact surface 42 of which is formed by two surface sections 42.1 and 42.2 which are arranged in a roof shape and on the ridge - Connect edge 43 to each other. The two surface sections 42.1 and 42.2 have an opposite inclination in the axial direction with respect to a parallel to the axis of the pivot bearing 35 which is preferably greater than that axial inclination ₍ which the sheet metal panels 30 / on both sides of the ridge edge 43 assume if they are due to this system on the Ridge elastically convex in the transverse direction 43. In the event that two guide elements 41 are arranged next to one another at a mutual axial distance, depending on the width of the

Metal sheets 30 and their elasticity their warping can also be concave. The axial inclination of the two surface sections 42.1 and 42.2 can be greater than that of the metal sheets 30 in the region of their contact point on the ridge edge 43 of the two guide elements 41. However, it can also be smaller than that of the metal sheets 30. Then the rear edge 33 bears on the outer edge of the assigned surface section 42.1 or 42.2. In the embodiment shown in FIGS. 6 and 7, the contact surface 52 on the guide element 51 is inclined as a whole in the axial direction. This means that the rear edge of the metal sheets does not cover the entire contact surface 52 _| abuts, but only on the protruding longitudinal edge 53 of the guide element 51.

8 shows a pair of guide elements 61, which are referred to as guide elements 61.1 and 61.2 for better differentiation. These two guide elements 61.2 and 61.2 are arranged together on a carrier part, not shown, at a predetermined mutual axial distance. They are connected to the carrier part in such a way that they can be shifted in the axial direction and can be fixed at a certain point.

The guide elements 61.1 and 61.2 differ from one another in so far as their contact surfaces 62.1 and 62.2 are inclined in opposite directions in the axial direction. The inclination of the contact surfaces 62.1 and 62.2 in the axial direction is expediently chosen to be smaller or larger than the axial inclination of the surface sections of the metal sheets 30 which bear against the guide elements 61.1 and 61.2. It is thereby achieved that the rear edge of the metal sheets lies either only on the higher longitudinal edges 63.1 and 63.2 or only on the lower longitudinal edges 63.1 and 63.2.

Instead of the described swivel drives with two end positions, it can be expedient to use swivel drives that enable a constant change in the swivel angle β of the contact surface 32 of the guide elements 31. Rotary drives with a crank drive, a cam drive or a spindle drive are suitable for this. This swivel drive can open a controllable electric motor. point ^'in order to be able to better adapt the pivoting movement to the requirements of different metal sheets. A stepper motor, a servo motor or [a linear motor. In addition to being used as an indirect drive, these motors can also be used for direct driving of the guide elements 32, with or without an intermediate gear.

When using a continuously adjustable swivel drive, for example with a stepper motor, the swivel angle ß of the guide element can largely be set as a function of its circumferential path, especially in the region of the circumferential path between the point at which the rear edge of the metal plates is at Guide element creates, and the point at which the rear edge of the metal sheets detaches from the guide element.

Already by the repeated changes in the curvature of the metal sheets 30 during the passage through the printing press 30 vibrations are excited in the metal sheets. In addition, during the transition from the transfer drum 17 to the pressure cylinder 11, the metal sheets 30 detach from the guide strips 22 and their rear edge 33 strikes the contact surface 32 of the guide elements 31 with a certain impact speed, which likewise excites or vibrates in the metal sheets 30 can amplify existing vibrations. Since these vibrations are unfavorable for a trouble-free passage of the metal sheets 30 through the printing press, it is expedient to produce the guide elements 31 as a whole from a vibration-damping material. Various plastics are particularly suitable for this.

Since the metal sheets 30 are generally separated from a coil, one forms at the front edge and the rear edge Burr. The cutting edge of the rear edge has an abrasive effect on the contact surface of the guide elements. Therefore, in the guide element 71 shown in FIG. 9, the material of which does not itself have the desired wear resistance, a wear-resistant layer 73 is arranged in the area of the contact surface 72.

A further modified guide element 81 can be seen from FIGS. 10 and 11. A layer 83 made of a wear-resistant material is arranged in the region of its contact surface 82. Underneath is a second layer 84 made of a vibration-damping material. The remaining part 85 of the guide element 81 is made of a conventional material, for example of metal.

In the case of the guide elements 71 and 81, the type of connection between the guide elements and the layer or layers arranged thereon and, if appropriate, the layers with one another depends on the materials of the parts combined with one another. This also applies to additives that may be used.

LIST OF REFERENCE NUMBERS

10 sheet metal printing machine

11 printing cylinders

12 printing cylinders

13 axis

14 axis

15 rubber cylinders

16 rubber cylinders

17 transfer drum

18 axis

19 drum core

21 lateral surface

22 guide rails

23 transfer point

24 transfer point

25 grippers

26 carriers

30 metal sheets

31 guide element

32 contact surface

33 trailing edge

34 holder

35 swivel bearings

36 tangent

37 carriers

38 rotary actuator

39 piston rod

41 guide element

42 contact surface

42.1 surface section

42.2 surface section

43 ridge edge

51 guide element

52 contact surface

53 longitudinal edge

61 guide element

62 contact surface

63 long edge

64 long edge

71 guide element

72 contact surface

73 layer (wear-resistant) 81 guide element

82 contact surface

73 layer (wear-resistant)

84 layer (vibration damping)

85 remaining part

Claims

claims

1. Guide device for sheet metal printing machines and sheet metal painting machines, with the features:

- There are at least two pressure cylinders (11; 12), - - which are arranged next to each other at a distance and

- whose axes (13; 14) are aligned parallel to one another,

a transfer drum (17) is provided between each two adjacent printing cylinders (11; 12), the axis (18) of which is at least approximately parallel to the axis (13; 14) of the printing cylinder (11; 12),

- below the transfer drum (17) there are guide rails (22),

- Which have an adjustable distance from the imaginary lateral surface (21) of the transfer drum (17), and - and which extend over a peripheral region of the transfer drum (17) which is smaller than the peripheral region which extends from the first transfer - Place (23) of the metal sheets (30) between the first printing cylinder (12) and the transfer drum (17) to the second transfer point (24) of the metal sheets (30) between the transfer drum (17) and the second printing cylinder (11) .

- At least one guide element (31) is provided on the transfer drum (17) at a specific circumferential point,

- - Which has an outwardly facing contact surface (32) for the metal sheets (30) opposite the Tangent (36) of the imaginary outer surface (21) of the transfer drum (17) has a predetermined angle of inclination (β), characterized by the features: - The guide element (31) is by means of a pivot bearing (35) parallel to the axis (18) of the transfer drum (17) aligned pivot axis pivotally mounted,

- There is a swivel drive (38), by means of which the angle of inclination (β) of the contact surface (32) of the guide element (31) with respect to the tangent (36) of the imaginary outer surface (21) of the transfer drum (17) can be changed.

2. Guide device according to claim 1 g e k e n n z e i c h n e t by the features:

- The angle of inclination (β) between the contact surface (32) and the tangent (36) of the imaginary outer surface (21) of the transfer drum (17) is at least approximately (in a range from 75 ° to 5 °,

- - being at that point of the orbital movement of the

Guide element (31), in which the rear edge (33) of the metal sheets (30) lies against the guide element (31), the larger angular value is present and - - being at that point of the orbital movement of the

Guide element (31), in which the rear edge (33) of the metal sheets (30) detaches from the guide element (31), the smaller angular value is present.

3. A guiding device according to claim 1 or 2, gekennzei ^* chnet by the features:

- The contact surface (42) of the guide element (41) is n two surface sections (42.1; 42.2). divided

- - which are arranged side by side in the axial direction and connect to each other and - - which are inclined in opposite directions in the axial direction,

- Preferably, the axial inclination of the two. Surface sections (42.1; 42.2) larger or smaller than that which the sheet metal panels (30) on the contact

Take 5 place opposite the surface line of the imaginary cylindrical surface (21).

4. Guide device according to claim 1 or 2, g e k e n n z e i c h n e t by the features:

10 - the contact surface (52) of the guide element (51) is oriented inclined in the axial direction,

- Preferably, the axial inclination of the contact surface (52) is greater or less than that which the metal sheets (30) at the point of contact with respect to

15 Take the surface line of the imaginary cylindrical surface (21).

5. Guide device according to claim 1 or 2, g e k e n n z e i c h n e t by the features:

, 20, - the presence of two guide elements (61.1; 61.2), which are arranged next to one another in the axial direction at a mutual distance, their contact surface (62.1; 62.2) is also inclined in the axial direction,

25 - the axial inclination of the two contact surfaces (62.1; 62.2) is oriented in opposite directions,

- The axial inclination of the two contact surfaces (62.1; 62.2) is preferably greater or smaller than that which the metal sheets (30) on the contact

30 take opposite the surface line of the imaginary cylindrical surface (21).

6. ^' Guide device according to one of claims 1 to 3 characterized by the features:

- In the case of two or more guide elements (61.1; 61.2), at least some of them are in the axial direction

5 adjustable.

7. Guide device according to one of claims 1 to 5, characterized by the features:

- The existing guide elements (31.1; 31.2) and their 10 associated swivel drive (38) are arranged on a common carrier (37),

- - The on a circular arc around the

Axis (18) of the transfer drum (17) is movably guided and 15 - - which is adjustable by means of an adjusting device to a certain circumferential position with respect to a predetermined fixed point on the transfer drum (17).

: 20

8. Guide device according to one of claims 1 to 5, g e k e n n z e i c h n e t by the features:

- The swivel drive (38) can be adjusted to two end positions.

25 9. Guide device according to claim 6, g e k e n n z e i c h n e t by the features:

- The swivel drive (38) has a pneumatic or hydraulic piston drive or an electromagnet.

30

10. Guide device according to one of claims 1 to 5, characterized by the features: - The swivel drive is continuously adjustable within a given swivel range.

11. Guiding device according to claim 8, g e k e n n z e i c h n e t by the features:

- The swivel drive has a crank drive or a cam drive or a spindle drive.

12. Guide device according to claim 10 or 11, g e k e nn z e i c h n e t by the features:

the swivel drive is formed by a controllable electric motor or has such a motor,

- This motor is preferably designed

- - as a stepper motor,

- - as a servo motor or - - as a linear motor.

13. Guiding device according to claim 8, g e k e n n z e i c h n e t by the features:

- The swivel angle (β) of the guide element (31) is dependent on at least part of it

Circulation path between the two circumferential parts an adjustable, in which the rear edge (33) of the metal sheets (30) lies against the guide element (31) or in which the rear edge (33) of the metal sheets (30) detaches from the guide element (31).

14. Guide device according to claim 1, g e k e nn z e i c h n e t by the features:

- The guide element (31) is either itself made of a vibration-damping material or that

Guide element (81) is provided with a vibration damping layer (84).

15. Guide device according to claim 1, g e k e n n z e i c h n e t by the feature:

- The guide element (71) is provided in the region of its contact surface (72) with a wear-resistant layer (73).

16. Guide device according to claim 14, g e k e n n z e i c h n e t by the features:

- The guide element (81) is in the area of its contact surface (82) with a wear-resistant

Layer (83) provided.

17. The guide device according to claim 14 or 16, which is characterized by the features: - The vibration-damping part of the guide element (31) or the vibration-damping layer (84) of the guide element (81)

- - made of plastic or

- - made of solid rubber or - - made of cellular rubber with open and / or closed pores.

18. The guide device according to claim 15, 16 or 17 is characterized by the features: - the wear-resistant layer (73; 83) consists

- - made of a hard metal or

- - Made of an oxide ceramic material or

- - from a silicate glass.