WO2020052819A1

WO2020052819A1 - Cutting device

Info

Publication number: WO2020052819A1
Application number: PCT/EP2019/063405
Authority: WO
Inventors: Jan Henrik Weychardt
Original assignee: Fachhochschule Kiel
Priority date: 2018-09-11
Filing date: 2019-05-23
Publication date: 2020-03-19
Also published as: EP3849763A1; DE202018105196U1

Abstract

The invention relates to a cutting device having a housing (28). In this case, a driven disc-shaped cutting tool (10), mounted in the housing (28), for cutting a workpiece (12) is provided. Arranged on a circumferential side of the cutting tool (10) are cutting means (14) that each have an associated cutting edge (14a), said cutting means (14), during cutting, depending on an infeed rate of the cutting tool (10) relative to the workpiece (12), passing into the material to be cut of the workpiece (12) on a cutting-edge entry side of the workpiece (12), passing out on a cutting-edge exit side, remote therefrom, of the workpiece (12), and in the process cutting away material of the workpiece (12). In this case, at least one pressure means is provided, which exerts a pressure (pH) on the surface of the cutting-edge exit side, via a cutting-edge exit face, on the cutting-edge exit side to the side of the cutting tool (10) in the region (18) of the cutting edge (14a), and is mounted in a pivotable manner with respect to the housing (28). According to the invention, the pressure means (24) is mounted in and at one end of at least one swing arm (26). The swing arm (26) is connected to the housing (28) via a first joint (30), wherein the swing arm (26) is mounted so as to be pivotable about a first joint axis of the joint (30). The first joint axis is arranged parallel to the axis of rotation (32) of the cutting tool (10).

Description

Separator

The invention relates to a separating device according to the type specified in the preamble of claim 1.

Separation devices are known in different embodiments, for example as a circular saw or cut-off machine, and are used to cut wood, metal, plastic, building materials or natural stone or individual workpieces. These cutting devices have a drive motor which generates the rotational movement of a disk-shaped cutting tool, such as a circular saw blade, a cutting disk or the like. The area of the cutting tool, which is out of engagement with the workpiece to be machined during operation, can be at least partially covered or surrounded by a protective hood. In this case, a blower driven by the drive motor and a device for dust removal from the interior of the protective hood are provided, which are introduced into the protective hood and with the pressure side of the blower in

Contains related inlet opening and a dust outlet opening.

In the separating devices of the type mentioned at the outset there is also a blower with which dust, dirt, chips or the like which arises during the separating process from the immediate area

Working area of the separation device can be removed. The blower can also serve to cool the drive motor at the same time.

In the known separating devices are surrounded by a protective hood, the inlet opening of which is as close as possible to the chip formation and is oriented such that chips enter it

get in. In the protective cover, the chip flow is deflected, if necessary, or braked by baffle plates and directed towards the outlet opening. The chip flight is supported by a blower or suction and is conveyed outside the protective hood. The aim is that as many chips as possible reach the air jet and the outlet opening due to their tangential throwing away. For this, the highest possible tangential speed of the cutting edge of the cutting tool is necessary.

On the other hand, however, there are tears at the edges of the cutting edge exit of the cutting tool cutting edge and thus an unclean cutting pattern on the surface of the workpiece to be cut. Using a circular saw as a separating device, this problem can be explained as follows: In circular saws, a saw blade cuts a plate, for example, by rotating at the speed n and moving at the relative speed Av to it. A saw tooth of the saw blade, which engages in the material of the plate, passes through the plate with the

Tangential velocity vt. This creates a cutting pressure p _{s which} , on the one hand, generates the shear stress T _S required for cutting due to its large gradient, but sometimes cannot be held by the material of the plate on the surface of the cutting edge exit: In a first approximation, that on the Permissible tensile stress s _z, z _ui Ps is exceeded and the surface consequently tears out in the area of the cutting edge exit, or chips or parts of chips still partially remain connected to the edge in the area of the cutting edge exit. The pulling out results in depressions on the top of the plate in the area of the cut surface and in the cut surface itself. This results in an unclean cut pattern on the edges on both sides of the cutting edge exit.

To avoid such unclean sectional images, it is known to provide pressure means in the form of rollers at the side of the cutting tool on the cutting edge exit side of the workpiece in the area of the cutting edge exit, which rollers generate a compressive stress in the area of the cutting edge exit. Here, compressive stress a _d in the form of Hertzian pressure p _H = a _{d is} applied to the workpiece in the area of the cutting edge exit via the rollers.

The rollers are coupled to the protective hood in such a way that they can be moved tangentially. This results in mechanical sheet guidance. The protective hood catches the chips with maximum kinetic energy and directs the chips efficiently into the extraction system so that it can be operated with reduced energy consumption. A disadvantage of this system, however, is that the suspension of the rollers has proven to be so elastic that the rollers deflected laterally and were removed from the saw blade to such an extent that a gap between the roller and the saw blade became too large to avoid tearing out. Pinch rollers can be found in DE 20 2013 101 927 U1, whereby they serve to guide workpieces under high forces, but not to show a counter pressure to the cutting pressure. The tear on the cut edges of wooden panels or corresponding deformations of

Plastic plates can be prevented by using a scoring saw directly at the cutting edge exit.

Furthermore, pressure rollers at the cutting edge entry and exit are listed in EP 0 036 964 B1 in order to achieve the shortest possible force flow and thus minimal deformation of the workpiece.

A role in the area of the saw blade is also described in DE 10 2006 026 043 B4, but for saw blade manufacture and not for use.

Kinematic guidance of elements depending on the work situation is in

DE 3 933 261 C2, but it is a belt-driven riving knife and no tearing avoidance during a sawing process.

The suction point close to the operating point is mentioned in DE 10 2012 007 344 A1, but no kinematically inevitable connection between the main chip flight direction and the orientation of the channel is disclosed.

DE 3 525 092 A1 describes fixed lines for dust and chip lines

Workpiece thickness placed independently - air jets suggested. Since the kinetic energy of the chips depends quadratically on the tangential speed vt, the additional energy expenditure must be weighed up economically according to the area of application.

The invention is therefore based on the object of developing a separating device in accordance with the type specified in the preamble of claim 1 in such a way that a clean sectional view on the cutting edge exit side is ensured while avoiding the disadvantages mentioned.

This object is achieved by the characterizing features of claim 1 in connection with its preamble features.

The subclaims form advantageous developments of the invention. The invention is based on the finding that a sufficiently rigid kinematic

Connection of the protective hood to the saw unit with the same guidance of the pressure medium on

Cutting edges can easily avoid the disadvantages mentioned.

The invention thus relates to a separating device with a housing. A driven disk-shaped cutting tool for cutting a workpiece is mounted in the housing. In this case, separating means, each with an associated cutting edge, are arranged on a peripheral side of the cutting tool and, when cutting, depending on a feed speed of the cutting tool relative to the workpiece, penetrate into the material of the workpiece to be cut on a cutting edge entry side of the workpiece and exit on a cutting edge exit side of the workpiece that is remote from it and remove material from the workpiece. In addition, at least one pressure medium is provided, which exerts a pressure p _H on the cutting edge exit side to the side of the cutting tool in the area of the cutting edge on the surface of the cutting edge exit side via the cutting edge exit surface and is pivotably mounted relative to the housing. According to the invention that is

Pressure medium stored at one end of at least one rocker in this. The rocker is connected to the housing via a first joint with a first joint axis. The rocker is pivotally mounted about the first hinge axis. The first hinge axis is arranged parallel to the axis of rotation of the cutting tool. The rocker simply results in less elastic deformation of the pressure medium suspension. In addition, the arcuate movability of the pressure medium is retained, which is necessary to compensate for different workpiece thicknesses and thus different engagement depths of the cutting tool.

The pressure medium is preferably designed in the form of at least one roller, the roller having a predetermined radius and the hinge axis being offset from the axis of rotation of the cutting tool at least around the radius of the rollers in the direction of the cutting edge exit side. This reduces the frictional forces during the feed movement and facilitates the separating movement with the separating device.

In order for a relative arrangement of the roll to be constant over the curve of the roll

To obtain the cutting edge exit area, the first hinge axis is arranged vertically offset upwards relative to the axis of rotation to a support plane of the separating device.

According to one embodiment of the invention, the swing arm is constructed in several parts and forms a swing parallelogram. The parallelogram is a convex square with opposite parallel sides like special trapezoids and also two-dimensional

Parallelepipede. In this respect, different training can form the parallogram.

The rocker parallelogram preferably comprises a first and second partial rocker and a coupling. The first partial rocker is connected to the housing via the first housing joint and the second partial rocker is connected to the housing via a second housing joint. The coupling is articulated on the side of the first and second partial rockers that is remote from the associated housing joint, via a first and second partial rocker link with the first and second partial rockers and at its one free end with the pressure medium. In a simple way it is thereby achieved that the joints of the rocker can be displaced further upwards and thus do not collide with the bearing and the drive of the separating tool. This results in a wider scope of design, it can also simplify the construction and the maximum kinetic energy for the

Maintain chip removal.

In order to enable, in particular, a uniform movement of the pressure medium with the separating tool, the joint axes of the first and second housing joints and of the first and second partial rocker joints are aligned parallel to the axis of rotation of the separating tool.

According to a development of the invention, the joint axis of the first housing joint, the second housing joint and the axis of rotation of the cutting tool are arranged on a first straight line running perpendicular to these axes. In particular, the first straight line runs perpendicular to the support plane of the separating device.

To complete the parallelogram, the joint axes of the first partial rocker joint, the second partial rocker joint and the axis of rotation of the roller are arranged on a second straight line running perpendicular to these axes.

In particular, the second straight line runs perpendicular to the support plane of the separating device. The second straight line preferably runs parallel to the first straight line.

According to one embodiment of the invention, the rocker forms a force introduction element which exerts the force required to generate the pressure required on the area of the cutting edge exit transfers the cutting edge exit surface to the cutting edge exit surface via the pressure medium. The necessary pressure is high enough to prevent the chips from being torn out.

The necessary pressure can be generated in different ways. On the one hand, the swing arm controls the pressure via the pressure medium via a defined dead weight.

Alternatively or in addition to this, a spring can rest on the rocker arm, which acts on the cutting edge exit surface via the rocker arm and the pressure medium and regulates the pressure in a determinable manner.

Again, alternatively or additionally, a motorized, preferably pneumatic,

Drive on the rocker attacks, which on the rocker and the pressure medium on the

Cutting edge exit surface acts and regulates the pressure in a determinable manner.

According to one embodiment of the invention, the pressure p _H generated on the cutting edge exit area by the pressure medium is spatially distributed such that it compensates for the cutting edge pressure p _s generated in the material in the area of the cutting edge exit area, so that the following applies in this area: p _H ^ Ps-

According to one embodiment of the kinematic chain, resistance forces in the pressure medium, such as in the roller or the rollers, which arise due to the advancement of the workpiece relative to the cutting tool, are transmitted to the housing by pressure forces in the rockers, which in turn press the pressure medium against the workpiece and to create a pressure. This can result in a predictable servo effect.

Since the cutting edge pressure p _s generated by the cutting edge can vary due to the speed of advance but also due to the rotational force of the cutting tool, means are provided for adjusting the pressure p _{H of} the pressure medium on the cutting edge exit surface.

According to one embodiment of the invention, the rocker and the orbit made possible by the rocker of the support area of the pressure medium can be formed by a four-bar construction with partial rockers and coupling, or by a cam-controlled gear or by a two-axis linear drive. A circular saw preferably forms the separating device, as has just been described, with a saw blade as a separating tool and saw teeth arranged on the circumference of the saw blade, each with a cutting edge as separating means.

Further advantages, features and possible uses of the present invention result from the following description in connection with the exemplary embodiments shown in the drawings.

In the description, in the claims and in the drawing, the terms and associated reference symbols used in the list of reference symbols given below are used. In the drawing means:

Fig. 1 a is a schematic side view of a saw blade when engaged in a workpiece

Illustration of the problem underlying the invention;

1 b is an enlarged detail view of Figure 1 a,

2 is a schematic side view on the area of a roller next to the saw blade,

3 shows a detailed view of a saw tooth of a saw blade in a workpiece with rollers,

Fig. 4 is a schematic view of a first embodiment of the invention;

Fig. 5 is a schematic view of a second embodiment of the invention;

Fig. 6 is a schematic view of a third embodiment of the invention;

Fig. 7 is a schematic view of a fourth embodiment of the invention;

8 shows a side view a of a fifth embodiment of the invention;

Fig. 9 is a sectional view A-A of Fig. 8;

10a shows a side view of a sixth embodiment with a first depth of cut; 10b is a side view of a sixth embodiment with a second depth of cut, and

10c shows a side view of a sixth embodiment with a third depth of cut.

1 a, 1 b, 2 and 3 schematically illustrate in detail the problem of an unclean sectional image that occurs during cutting, in particular when sawing.

During circular sawing, a saw blade 10 separates one that is not shown in detail here

Circular saw 8, for example, a plate 12 as a workpiece to be cut by rotating at speed n and moving at relative speed D v. A saw tooth 14 of the saw blade 10 with a cutting edge 14a, which engages in the material of the plate 12, passes through the plate 12 with the tangential speed vt. This creates a cutting pressure p _{s which} , on the one hand, generates the shear stress T _S required for cutting due to its large gradient , but sometimes cannot be held by the material of the plate 12 on the upper side 16 of the cutting edge _exit : In a first approximation, the tensile stress s _{z, zuΐ} <Ps permissible on the surface of the upper side 16 is exceeded and the surface in the area 18 of the cutting edge _exit consequently tears out, or chips or parts of chips are still partially connected to the edge 22 in the area 18 of the cutting edge exit. The pulling out results in depressions on the top 16 of the plate 12 in the area of the cut surface 20 and in the cut surface 20 itself. This results in an unclean sectional view on the edges 22 on both sides of the cutting edge exit.

To avoid such unclean sectional images, the saw blade 10 must be on the side of the

Cutting edge exit side of the plate 12 in the area 18 of the cutting edge exit rollers 24 are provided which generate a compressive stress in the area 18 of the cutting edge exit. Here, compressive stress a _d in the form of Hertzian pressure p _H = a _{d is} applied to the workpiece in the area 18 of the cutting edge exit via the rollers 24. The rollers 24 are spatially the same on both sides of the saw blade 10, but are only arranged on sides of the saw blade 10 that are at a distance from one another.

In principle, it is possible to provide only one roller in the area 18 of the cutting edge exit.

However, two rollers 24 are preferably provided.

If two rollers 24 surround the saw blade 10 on both sides in such a way that the pressures applied by the rollers 24 to the top 16 of the plate 12 in the region 18 of the cutting edge exit coincide, p _s is overcompensated by p _H and tearing is prevented. An exact alignment of the base line FL of a roller 24 and the cutting edge exit line SL of the sawtooth 14a of the saw blade 14 is not necessary. It is sufficient if the spatially distributed pressures p _H and p _s coincide so that s _{z is} never exceeded anywhere. A small gap SP between the rollers 24 and the saw blade 10 is also permissible as long as the strength condition is met. This gap SP causes additional bending stresses, which must also be compensated for.

4, according to a first embodiment of the invention, the roller 24 is detachably connected to a housing 28, not shown here, via a rocker 26. The attachment point 30 on the housing 28 of the rocker 24 lies with the radius R of the rollers 24 above an axis of rotation 32 of the saw blade 10. The base line FL of both rollers 24 at any cutting height always follows the cutting edge exit line SL exactly and the pressures p _s and p _H ideally fall together.

Tearing is avoided even with limited elastic deformations of the system and / or manufacturing inaccuracies, that is to say an offset of the base line FL and cutting edge exit line SL. The base line FL of the roller 24 and the cutting edge exit line SL of the cutting edge 14a of the sawtooth 14 are preferably congruent. In order to ensure this, the articulation point 30 is, among other things, offset upwards by the radius R of the roller 24 with respect to the axis of rotation 32 of the saw blade 10.

For each roller 24, a rocker 26 is provided, which is rotatable about a common axis of rotation in the attachment point. The rocker 26 is always directed perpendicular to the tangential speed vt of the saw blade 10 or the saw tooth 14. If a protective hood (not shown here) is installed, it captures the chips with maximum kinetic energy and directs them efficiently into the extraction system. As a result, the suction can be operated with reduced energy consumption.

According to a further exemplary embodiment of the invention, the rocker 26 is designed as a parallelogram guide, see FIG. 5. The parallelogram is a convex square with

opposite parallel sides like special trapezoids and also two-dimensional

Parallelepipede. In this respect, different training courses can form the parallelogram. In the present case, the rocker 26 is constructed in several parts and forms a rocker parallelogram. The rocker arm 26 comprises a first partial rocker arm 34, a second partial rocker arm 36 and a coupling 38. The first partial rocker arm 34 is connected to the housing 28 via a first housing joint 30a and the second partial rocker arm 36 is connected via a second housing joint 30b. The coupling 38 is on the side of the first side which is remote from the associated housing joint 30a, 30b Partial rocker 34 and second partial rocker 36 each articulated via a first and second

Partial rocker joint 40a, 40b connected to the first partial rocker 34 and second partial rocker 36 and at its one free end to the roller 24.

The articulation axes of the first and second housing articulations 30a, 30b and of the first and second partial rocker articulations 40a, 40b are aligned parallel to the axis of rotation of the saw blade 10. The hinge axis of the first housing joint 30a, the second housing joint 30b and the axis of rotation of the saw blade 10 are arranged on a first straight line 42 running perpendicular to these axes. The first straight line 42 runs perpendicular to a support plane 44 of the circular saw 8.

The joint axes of the first partial rocker joint 40a, the second partial rocker joint 40b and the axis of rotation of the roller 24 are arranged on a second straight line 46 running perpendicular to these axes. The second straight line 46 runs perpendicular to the support plane 44 of the circular saw 8.

The circular saw 8 is to be designed structurally with regard to its overall rigidity with regard to permissible gaps SP and offsets of the base line FL and cutting edge exit line SL such that, depending on the material to be processed, the tensile stress s _{Z: zui} permissible on its surface is not exceeded.

The pressure p _H generated by the rollers 24 on the upper side 16 of the workpiece is introduced by a force which acts on the rollers 24 via the rocker arm 26. The rocker 26 forms a force introduction element, which has the required force to generate the necessary pressure, that is to say the pressure p _H on the area 18 of the cutting edge exit via the roller 24 on the

Edge exit area that is large enough to prevent the chips from being torn out. The force can be generated by the weight of the rocker 26, which is large enough to generate the necessary pressure. In addition, the force can also be generated by a spring (not shown here) on the rocker arm 26, which acts on the cutting edge exit surface via the rocker arm 26 and the roller 24 and generates the necessary pressure. A motor drive is also conceivable which engages the rocker 26 and generates a corresponding force which acts on the cutting edge exit surface via the rocker and the roller and generates the necessary pressure. In any case, the pressure p _{H of} the roller 24 generated on the cutting edge exit surface is spatially distributed in such a way that it compensates for the cutting edge pressure p _s generated in the material by the cutting edges 14 a in the area of the cutting edge exit surface, so that the following applies in this area: p _H ^ Ps .

In addition, means for adjusting the pressure of the rollers can also be provided.

6, according to a third embodiment of the invention, the roller 24 is detachably connected to the housing 28 via the rocker 26. In principle, this embodiment corresponds to the first embodiment. However, the roller 24 is not mounted directly on the rocker 26, but via a saw shoe 48, so that the pivot axis 50 of the saw shoe 48 and the associated joint 52 between the free end of the rocker 26 and the saw shoe 48 with that on the

Workpiece 12 overlying base line FL of roller 24 and cutting edge exit line SL are aligned.

The roller 24 is rotatably mounted in the saw shoe 48. The saw shoe 48 is connected to the rocker 26 in the area of the foot of the roller 24 via the joint 52. In the saw shoe 48, the roller 24 is guided perpendicularly to a support surface of the saw shoe 48 and is tensioned against a stop 54 by means of a spring 56. The roller 24 protrudes slightly from the bottom of the saw shoe 48 and is raised by the workpiece 12 so that it can roll freely and compensate for the cutting pressure.

In real designs, the pivot point of the saw shoe 48 is usually further forward than the circular saw 8. Here, too, coupling can be achieved by means of a much more complex kinematics in such a way that the base line FL of the roller 24 and the cutting edge exit line SL are aligned. Pressing the roller 24 onto the workpiece 12 can e.g. are applied and metered by forces from their own weight and / or pneumatic cylinders.

An alternative parallelogram guide to the second embodiment is shown in FIG. 7. In addition, a saw shoe 58 is provided, which is guided over the workpiece with the sawing. The

Saw shoe 58 is coupled to saw 8 with a geometrically identical, but mechanically independent four-link chain kinematics 60. The advantage of this coupling is that the roller 24 comes to rest on the saw shoe 58 on cams 62 arranged at the front and behind the roller 24 and thus lies in a defined manner when the circular saw 8 is lifted off. 8 and 9, in which a conical roller 64 on one side of the saw blade 10 also enables miter cuts. On the other side of the saw blade 10 there is a cylindrical roller 66 with a recess 68, which brings about a concentrated application of pressure at the cutting edge exit. Both rollers 64 and 66 are guided on adjustment axes 70 by means of bearings 72. The adjustment to compensate for abrasion by the saw blade 10 is done by a thread in a roller holder 74. The adjusting axis 70 is secured against rotation by means of a clamping screw 76 in the roller holder 74.

For the specific embodiment, FIGS. 10a, 10b and 10c show the dipping of the saw blade 10 into the workpiece 12 using three different depths. A total of three hoods 78 can be moved relative to one another in such a way that both the chips are caught and transported away, and the saw blade 10 always is encapsulated.

Reference list

8 circular saw

10 saw blade

12 plate as workpiece to be cut

14 sawtooth

14a sawtooth cutting edge 14

16 Top of the workpiece

18 Area of the cutting edge exit

20 cut surface

22 edges in the area of the cut surface 20

24 roll

26 swingarm

28 housing

30 anchor point

30a first housing joint, below

30b second housing joint, above

32 axis of rotation of the saw blade 10

34 first swing arm, below

36 second swing arm, above

38 paddock, aligned vertically

40a first partial swing joint, below

40b second partial swing joint, above 42 first straight line

44 support level of the circular saw 8

46 second straight line

48 saw shoe

50 swivel axis of the saw shoe

52 joint

54 stop

56 spring

58 saw shoe

60 four-link chain kinematics

62 cams

64 tapered roller

66 cylindrical roller

68 Recess

70 adjustment axes

72 bearings

74 roll holder

76 clamping screw

78 hood

FL foot line

SL cutting edge exit line

SP gap

R radius of the roller 24

Claims

Patent claims

1. Separating device with a housing (28), a driven disc-shaped cutting tool (10) mounted in the housing (28) for cutting a workpiece (12), with on a peripheral side of the cutting tool (10) separating means (14), each with an associated cutting edge (14a) are arranged, which during the separation depending on a

Feed speed of the cutting tool (10) relative to the workpiece (12) penetrate into the material of the workpiece (12) to be cut on a cutting edge entry side of the workpiece (12), exit on a cutting edge exit side of the workpiece (12) remote from it and thereby material of the workpiece ( 12) remove by machining, at least one pressure medium being provided, which is located on the side of the cutting edge exit

Cutting tool (10) in the area (18) of the cutting edge (14a) on the surface of the

Cutting edge exit side exerts a pressure (p _H ) via a cutting edge exit surface and is pivotably mounted relative to the housing (28), characterized in that the pressure medium (24) is mounted in this at one end of at least one rocker arm (26), the rocker arm (26) is connected to the housing (28) via a first joint (30), the rocker (26) being mounted so as to be pivotable about a first joint axis of the joint (30), the first joint axis being parallel to the axis of rotation (32) of the separating tool (10) is arranged.

2. Separating device according to claim 1, characterized in that the pressure medium is in the form of at least one roller (24), the roller (24) having a predetermined radius (R) and the hinge axis to the axis of rotation (32) of the separating tool (10 ) is offset at least by the radius (R) of the roller (24) in the direction of the cutting edge exit side.

3 separating device according to claim 1 or 2, characterized in that the first

Hinge axis relative to the axis of rotation (32) vertically to a support plane (44) Separating device is arranged offset from this.

4. Separating device according to one of the preceding claims, characterized in that the rocker (26) is constructed in several parts and forms a rocker parallelogram, which in particular comprises a first and second partial rocker (34, 36) and a coupling (38), the the first partial rocker arm (34) is connected to the housing (28) via a first housing joint (30a) and the second partial rocker arm (36) via a second housing joint (30b), the coupler (38) on the associated housing joint (30a, 30b) remote side of the first and second partial rockers (34, 36) each articulated via a first and second partial rocker joint (40a, 40b) with the first and second

Part rocker (34, 36) and at its one free end is connected to the pressure medium (24).

5. Separating device according to claim 4, characterized in that the hinge axes of the first and second housing joints (30a, 30b) and the first and second

Partial rocker joint (40a, 40b) are aligned parallel to the axis of rotation (32) of the cutting tool (10).

6. Separating device according to claim 4 or 5, characterized in that the joint axis of the first housing joint (30a), the second housing joint (30b) and the axis of rotation (32) of the separating tool (10) on a first straight line (42 ) are arranged.

7. Separating device according to claim 6, characterized in that the first straight line (42) extends perpendicular to the support plane (44) of the separating device.

8. Separating device according to one of claims 4 to 7, characterized in that the joint axes of the first partial rocker joint (40a), the second partial rocker joint (40b) and the axis of rotation of the roller (24) on a second straight line (46) running perpendicular to these axes. are arranged.

9. Separating device according to claim 8, characterized in that the second straight line (46) extends perpendicular to the support plane (44) of the separating device.

10. Separating device according to one of the preceding claims, characterized in that the rocker (26) forms a force introduction element which generates the force required to generate the necessary pressure (p _H ) on the area (18) of the cutting edge exit on the cutting edge exit surface via the pressure medium ( 24) which is large enough to prevent the chips from being torn out.

11. Separating device according to claim 10, characterized in that the rocker (26) regulates the pressure (p _H ) via the pressure medium (24) in a definable own weight.

12. Separating device according to claim 10 or 1 1, characterized in that a defined spring rests on the rocker (26), which acts on the rocker exit surface via the rocker (26) and the pressure medium (24) and the pressure (p _H ) can be determined regulates.

13. Separating device according to claim 10, characterized in that a motor,

in particular pneumatic drive acts on the rocker (26), which acts on the rocker exit surface via the rocker (26) and the pressure medium (24) and regulates the pressure (p _H ) in a determinable manner.

14. Separating device according to one of claims 10 to 13, characterized in that the pressure generated on the cutting exit surface (P _H) are spatially distributed so that this compensates for the cutting pressure (p _s) produced by the cutting edges in each case in the material in the region of the cutting exit surface , so that in this area applies: p _H ^ Ps.

15. Separating device according to one of the preceding claims, characterized in that means are provided for adjusting the pressure of the pressure medium or the pressure medium (24) on the cutting edge exit surface.

16. Separating device according to one of the preceding claims, characterized in that the rocker and the circular path of the bearing area of the pressure medium made possible by the rocker is formed by a four-bar construction with partial rockers and coupling, or by a cam-controlled transmission or by a two-axis linear drive.

17. Separating device according to one of the preceding claims, characterized in that a circular saw (8) forms the separating device with a saw blade (10) as Cutting tool and saw teeth (14) arranged on the circumference of the saw blade (10), each with a cutting edge (14a) as a separating agent.