WO1995024980A1

WO1995024980A1 - Device for removing projecting objects inside a pipe

Info

Publication number: WO1995024980A1
Application number: PCT/EP1995/000947
Authority: WO
Inventors: Helmar Haas
Original assignee: Helmar Haas
Priority date: 1994-03-16
Filing date: 1995-03-14
Publication date: 1995-09-21
Also published as: DE29504598U1

Abstract

The invention concerns a device with a driveable tool for removing projections, deposits, peripheral internal weld beads and the like, projecting into the interior of a pipe. This device can be supported centrally against the inner pipe wall by runners, rollers or the like and transported through the pipe (1) by an advance drive system. The tool can be advanced towards the inner pipe wall (7) at least by centrifugal force against the resistance, for example, of a common restoring arrangement, from the interior to the exterior. Each cutting tool (12, 42) is located on a supporting block (23) which is mounted on a holder (11) of the device so as to be pivotable at least to a limited extent about an axis (60) which is approximately parallel to the geometric axis (13) of the pipe.

Description

Title: Device for removing protruding objects inside a tube

DESCRIPTION

The invention relates to a device for removing objects projecting into the interior of a tube, such as deposits, circumferential inner welding beads and the like, according to the preamble of claim 1.

Such a device is known from DE 87 12 494 Ul. The cutting tools that can be moved against the inner wall of the tube are radially oriented circular knives that can be extended in the radial direction against the resistance of a spring. However, the travel distance is quite limited, which is why the pipe inside diameter of the pipe to be cleaned may only slightly deviate from a certain setpoint. In addition, due to the purely radial displacement movement, in most cases it is no longer possible for the circular knives to go back when an obstacle occurs due to self-blocking. As a result, this device is very susceptible to failure.

If plastic tubes are butt-jointed with each other in the mirror welding process, beads are formed on the outside as well as on the inside, the inner bead reducing the cross section at the point in question. In addition, solids tend to be deposited there, which are carried along by the flowing medium. Because the formation of such beads cannot be prevented, and on the other hand, the desire for at least the inside entire length of smooth pipes, there is a great need for a device with which such beads and other objects projecting inwards, such as deposits, incrustations and the like, can be removed.

At the bottom of the landfill there are PE pipes that are perforated on part of their circumference. Through these holes, leachate can get from the landfill into the pipes in which it is collected and through which it is drained. There are no significant currents, which is why the inner ridges mentioned are particularly disadvantageous in this area of application. The liquids transported in the pipe are heavily enriched with solids. The latter are deposited on each inner bulge, causing the pipes to become increasingly clogged.

The same applies to pipes, such as sewage pipes made of concrete or plastic, in which, for example, concrete deposits from connecting the pipe sections are present or have grown into the tree roots and thus at least partially block the free passage.

Thus, the task is to develop a generic device so that protruding objects such as deposits, ingrowths and the like can be removed flush without having to fear a blocking or adjusting movement of the tool when working.

To achieve this object, the features specified in claim 1 are provided in a device of the type mentioned. If this device is rotated, the at least one bearing block and, in the case of a plurality of bearing blocks, all bearing blocks are pivoted outwards simultaneously with their cutting tools due to the action of centrifugal force. The cutting edge of the cutting tool consequently rotates on a flight circle which is larger than an imaginary circle on which this cutting edge is located when the tool is stationary. Appropriate measures can be taken to ensure that the flight circle of the rotating cutting tool is not greater than the inside diameter of the pipe to be cleaned or to be freed of the deposits or the like. If, however, the resistance becomes too great when removing welding beads, protruding projections, deposits, ingrowths and the like, for example because the feed speed of the device is chosen too high, the cutting tool is not sharp enough or is not suitable for removing a deposit for any other reason , these deposits press as soon as they are reached by the cutting edge of the cutting tool, the latter, which leads to a pivoting back movement of the bearing block against the action of centrifugal force. In any case, damage to the device as well as to the pipe, channel or the like is avoided.

A particularly preferred embodiment of the invention is characterized in that the bearing block is a one-armed lever and the cutting edge of each cutting tool is located at a radial distance from the geometrical swivel pin of the bearing block. As the exemplary embodiments show, the one-armed lever does not necessarily have to run in a straight line, but rather an angled shape, an angular shape and the like are also readily conceivable and usable. It is only important that when pivoting the bearing block around its geometric swivel axis, the cutting edge of the cutting tool describes an arc around the same geometric axis.

A further embodiment of the invention provides that the cutting edge of each cutting tool is located on a cutting steel which can be adjusted and locked on the one-armed lever transversely to the longitudinal extent of the same. In this way, the cutting steel and the cutting edge can be precisely aligned with the one-armed lever. This is particularly important when the outward pivoting movement of the one-armed lever can be limited in a suitable manner.

A particularly advantageous variant of the invention is characterized in that the holder has a plurality of cutting steels or similar cutting tools, the cutting edges of which rotate in the working position on flight circles of different sizes. In this way, protrusions, deposits and the like can be removed step by step, thereby saving drive energy.

At this point it is additionally noted that this device, like the generic device mentioned above, is advanced or advanced in the interior of the tube and the cutting steels are still in their inner transport position in which they do not touch the tube wall. In the prior art, the displacement takes place with the aid of rollers, which can also be used in the device according to the invention. Instead, the use of runners is also possible, as one of the exemplary embodiments shows.

The cutting steels are, in a very advantageous manner, essentially uniform around the circumference arranged rotationally symmetrical holder. The axis of rotation of this device therefore coincides with the geometric axis of the tube. Depending on the size of the tube and the thickness as well as the strength or toughness of the materials to be removed, three or more cutting steels can be provided.

A further particularly preferred embodiment of the invention results from claim 6. It enables a deposit or the like to be removed step by step, the cutting steel at the foremost in the feed direction of the device initially taking effect, but only partially removing the deposit or the like. With the next cutting steel, the bead is further removed and in the case of three cutting steels, the third turns the tube even more inside, in particular flush. The advantage of this variant is that, because of the lower removal rate of each cutting steel, a lower drive power is required in relation to ^" a device that has to remove the bead completely in one operation. This also results in a longer tool life.

In a further development of the invention, the holder has two circular disks arranged at a center distance, between which are located the pivoting bearing blocks, each with a cutting steel. The special design of these bearing blocks depends on the shape of the cutting steel and the other requirements such as space, light weight and the like.

To set the working flight circle of each cutting steel, the device is advantageously equipped with the features of claim 8 or claim 9. The fine toothing mentioned in the latter enables a sensitive adjustment of each Cutting steel opposite its bearing block. By loosening the screws, preferably a grub screw, the teeth can be loosened so that a readjustment or also a removal of the cutting steel is possible.

Another preferred variant of the invention is characterized in that there is a support member on each bearing block, the support surface of which rotates during operation on a flight circle that is equal to or larger than the flight circle of the most swung-out cutting steel. This means that under the action of centrifugal force, the pivoting out of the bearing block ends when the support member bears against the inner tube wall. If the cutting edge or cutting edges or the most protruding cutting edge moves on the same flight circle as the supporting surface or edge of the supporting member, then, for example, in the case of a bead removal, the bead is removed flush down to the inside diameter of the tube. The same applies to the removal of incrustations, dirt, ingrowth and the like.

The support member is expediently displaceable and lockable on the bearing block towards the outside, so that it can be adjusted according to the desired work result.

Another variant of the invention is characterized in that the support member forms a displaceable and lockable unit mounted on the bearing block with the cutting steel. The latter can be locked in a further embodiment of the invention by means of a holding plate which can be adjusted and fixed on the bearing block, both of which can be coupled via a supporting toothing and, as a result, can be finely adjusted. Furthermore, it is very advantageous that a projection or the like rearward facing away from the axis of rotation of the bearing block together with a stop fixed to the housing forms a swiveling limiting device. As a result, the bearing blocks cannot be pivoted further outward than the swiveling limiting device allows, even with the greatest centrifugal force, an adjustment possibility also being provided in this case, of course.

A guide on the inner tube wall and thus also the working flight circle of each cutting edge can be achieved in a very expedient manner by means of the features described in claim 13.

Furthermore, the travel distance of the bearing block is advantageously adjustable and can be limited by means of fixed stops at the end points, as is achieved in accordance with the features of one or more of claims 17 to 19. The result of this is that deformations, pipe offsets, dimensional changes of neighboring pipes of the pipe run to be cleaned can be bridged without problems.

Further refinements and the advantages and effects resulting therefrom result from the remaining subclaims and the following description of exemplary embodiments.

The drawing shows these exemplary embodiments of the invention in a partially simplified illustration. Here represent:

Figure 1 schematically and partially broken with a longitudinal section through a pipe consisting of at least two pipe sections a device according to a first embodiment of the present invention in side view,

FIG. 2 shows, on an enlarged scale, a partially broken front view of the device according to FIG. 1 cut in the radial direction in the area of a cutting steel,

Figure 3 in an enlarged and partially sectioned

Representation of the front part of the device according to Figure 1 in side view,

Figure 4 in an enlarged and partially sectioned

1 shows a top view of the front part of the device according to FIG. 1,

5 shows a representation of the device corresponding to FIG. 2, but according to a second exemplary embodiment of the present invention,

6 shows a representation of the embodiment of FIG. 5 corresponding to FIG. 3, and

7 shows a representation according to FIGS. 2 and 5, but according to a third exemplary embodiment of the present invention.

A pipeline consists of a plurality of individual pipes or pipe sections, wherein in the case of seepage pipes, the pipes are at least partially perforated. If the pipes are made of plastic, for example of PE material, adjacent pipes 1 and 2 can be butt-jointed in the so-called mirror welding process. This then creates an outer bead 3 and an inner bead 4. The latter can be removed with the device according to the invention. It is supported on the inner tube wall 7 with several, for example three, runners 6 or the like, which are evenly distributed over the circumference, and is transported through the tube in the direction of arrow 5, for example. This is achieved either with the aid of a pulling cable connected to the front eyelet 8 and / or by means of a nozzle pressure water drive 9 known per se, to which the pressure water is supplied via a hose 10.

An essential element of the device according to the invention is a holder 11 with at least one cutting steel 12 projecting outwards. In all the exemplary embodiments, however, there are three cutting steels 12 which are uniformly offset on the circumference of the holder 11. The longitudinal axes of the cutting steels 12 do not necessarily run in the radial direction but are only directed outwards and this also applies to the delivery into the working position or the return to the rest or transport position. The holder 11 can be rotated about the geometric axis 13 of the tube 1, 2 by means of a rotary drive 14. In analogy to the nozzle pressure water drive, the rotary drive is also a hydraulic drive which is known per se and which can likewise be fed with pressure water via the hose 10. The drive takes place by recoil, which is why these drives are equipped with nozzles 15 and 16. The holder 11 is mounted in a manner not shown on the remaining device by means of ball bearings.

The central position of the holder 11 in the tube 1, 2 is achieved by appropriate design of the carrier 17 for the runners 6. The carriers 17 can be divided into two and telescopically in a manner only indicated be extendable so that the device can be used within specified limits in pipes of different inner diameters. In Figure 2, a smallest and a largest flight circle of the cutting edge 20 of a cutting steel 12 are shown, that is, with regard to the cutting steels 12, an adaptation to different pipe inner diameters is possible. This will be discussed in more detail later.

According to FIGS. 3 and 4, the holder 11 has two parallel disks 21 and 22, which are held at a lateral spacing, which are preferably circular disks. Between them there are, for example, three bearing blocks 23, each with a cutting steel 12. In this case, it is provided that the two disks 21 and 22 are held together by means of three screws 24, spacer bolts being located at the corresponding points. Each bearing block 23 is supported in the sense of the double arrow 26 on a bolt 25 which extends parallel to the connecting screws 24 and can, for example, be pressed into one of the plates. A tension spring 27 holds each bearing block 23 in its inner pivot position, in which the cutting edges 20 are approximately on an imaginary circle which is smaller than the smallest flight circle 18. This imaginary circle is also smaller than the inner tube diameter, so that the device without that the cutting edges touch the pipe wall, can be advanced or advanced to the work site. The inner position of each bearing block 23 is secured with the aid of a stop member, a stop edge or the like of the bearing block, which interacts with a stop surface, edge or the like on one of the disks 21, 22 or a disk-fixed element between the disks. In FIG. 3, the two spring ends are connected to one of the disks, for example disk 22, and the bearing block 23. Instead it is also possible, however, to use a common, for example annular spring, in particular a tension spring, which pivots all holders inwards and which is tensioned or additionally tensioned during operation of the device. It is then guided via a support member on each bearing block.

If the device is rotated, the bearing blocks 23 pivot outwards under the action of the centrifugal force. The cutters 20 then move in each case on the actually provided or set or otherwise defined flight circle or the actual inner contour in the case of non-circular tubes. The cutting steels 12 can be displaced and locked in an approximately radial direction, i.e. adjustable held on their bearing block 23. So that not all cutting edges work at the same time, the flight circle is selected to be different in size for each cutting steel 12. This is achieved in that the three cutting steels 12 are displaced outward to different degrees on their bearing block 23 and then clamped. The diameters of the effective flight circles can differ from each other by a few millimeters.

Of course, if all three effective flight circles were in a common radial plane, this would not have the desired effect; rather, only one cutting steel, namely the most protruding one, would work. So that this is not the case, the three effective flight circles are slightly offset from one another in the direction of the geometrical axis of rotation 29 of the device or in the working feed direction 5. This is illustrated in FIG. 3 by three dash-dotted lines 30, 31 and 32. The dash-dotted line 32 symbolizes the plane of the flight circle, which is the edge that at least projects when working 20. The dash-dotted line 30 symbolizes the plane of the flight circle of the most outwardly protruding cutting edge 20. The cutting edge of the medium-sized flight circle rotates between them, which is symbolized by line 31. This means that with rotating device and feed in the direction of arrow 5, the inner bead 4 or the like is only slightly removed with the aid of the cutting edge 20 on the flight circle of the plane 32. The next following cutting edge 20 on the flight circle of level 31 removes the inner bead 4 somewhat more and the cutting edge 20 of level 30 then removes the inner bead 4 completely or insofar as this is provided.

In order to limit the pivoting out of the bearing blocks 23 by the effect of centrifugal force and thus also to determine the effective flight circles of the cutting edges 20, a support member 33 is attached to each bearing block 23. The support surfaces 34 of all support members, which are designed, for example, as elastic or hardened molded parts or as ball or needle bearings, rotate on a common flight circle, which is determined by the inside diameter of the pipe to be cleaned or machined and is possibly as large as this. This means that none of the cutting edges 20 protrude outward beyond the support surface 34. If a flush processing of an inner bead 4 or of impurities or of projecting tree roots or the like of a pipe 1 is provided, only one of the cutting edges 20 of all cutting steels protrudes up to the flight circle of the support surface 34, while the others by corresponding amounts corresponding to the lines 30 , 31 and 32 are internally displaced.

The associated effective flight circles of the three cutting edges 20 for the smallest pipe diameter are designated in FIG. 2 by 18, 18a and 18b. The same applies to any other pipe diameter. In order to be able to use the device for cleaning or processing pipes of different inner diameters, the support members 33, like the cutting steels 12 in the direction of the arrow 28 (FIG. 2), are mounted on their bearing block 23 so as to be displaceable and lockable. For this purpose, the support members 33 have a shaft 35, indicated in FIG. 2, on which there is an elongated hole through which a clamping screw or the like is penetrated, which after the longitudinal adjustment is firmly screwed into a thread of the bearing block 23. In the adjusting device for the cutting steels 12, indicated on the cylindrical shaft 43, there is a longitudinal groove 36 which is closed at both ends and into which the free end of a locking screw 37 engages and presses against the base of the longitudinal groove 36.

Figures 3 and 4 show that a support plate 38 of each support member 33 overlaps one of the disks, in the exemplary embodiment the disk 21. When the device is at rest, its underside lies on the cylinder jacket 39 of the disk 21. In this respect, the working position of the cutting steels 12 is shown in FIG. 3 with the bearing blocks 23 pivoted out. The contact of the underside of the support plates 38 is achieved with the aid of the at least one tension spring. The inner pivoted-in position of the bearing blocks 23 can thus be limited with the aid of the stop device formed from the support plates 38 and the jacket 39 of the disk 21. When the device rotates, the support surface 34 of each cutting steel 12 lies against the inside of the tube.

The connecting screws 24 for holding the two disks 21 and 22 together are located according to FIG. 2 on a relatively small bolt circle diameter. As indicated by the cross 40 (FIG. 2), they can also be set further outwards, for example close to the In this case, they can, together with a rear shoulder 41 of the bearing block 23, form a device for limiting the maximum outward pivoting of the bearing blocks 23, which becomes effective, for example, when a sudden pipe expansion or the like occurs inside the pipe. Durchmeεεerver Magnification is located and thereby the support surfaces 34 are free. When removing the inner bead 4 or the like. Elements protruding into the tube 1, 2, however, an inner support is provided in principle via the support members 33.

The design of the cutting steel 12 according to FIGS. 2 and 3 is such that the cutting head 44 is provided with a cutting tip 42 made of hard metal, for example, and held by means of a screw or the like, so that it can be removed for regrinding or for replacement .

The shaft 43 of the cutting steel 12 consists largely of round material and is slidably mounted in a circular bore 45 of the bearing block 23. It is secured against rotation by the screw 37. The head 44 of the cutting steel 12 can, according to the drawing, have a different shape, in particular also a different cross-sectional shape. It aligns itself. after the cutting plate 42. A prismatic receptacle can be provided for this. The lateral displacement of the cutting edges 20 of the three cutting steels 12 is achieved, for example, by different design of the head 44. This has the advantage that both the shafts 43 of the cutting steels 12 and the receiving bores 45 on all bearing blocks 23 can be designed and arranged identically. It is also conceivable, however, in the case of identical cutting steels 12, to offset the geometric axis 46 of the bore 45 by the amounts which correspond to the lateral spacing of the lines 30, 31, 32. In FIG. 2, the cutting edge 20 of the cutting steel 12, which is furthest in operation, and the support surface 34 of the support member 33 rotate on a common smallest flight circle 18. With this setting, the inner beads 4 or the like are removed flush with the inner tube wall of the smallest tube. For safety reasons, the support member 33 can instead be pushed a little further out so that it rotates on a flight circle which is approximately larger than the flight circle 18 of the cutting edge 20. When the rotary drive 14 is at a standstill, the force of the spring or springs 27 has an effect. so that each bearing block 23 is pivoted clockwise around the bolt 25 until the support plate 38 of the support member 33 hits the cylinder jacket 39 of the disk 21.

5 and 6, the support member 33 is made in one piece with the bearing block 23. It can have two spherical support surfaces 34 lying one behind the other in the circumferential direction. Both are expediently in contact with the inner tube wall at the same time. The cutting steel 12, which is mounted on the bearing block 23 so as to be displaceable and lockable in the direction of the double arrow 28, carries a removable hard metal plate 42, which in this embodiment is truncated cone-shaped, which in this case has a circular cutting edge 20. When worn, it can simply be rotated further by a certain angle and then held tight again by means of a central screw.

In the exemplary embodiments in FIGS. 5 and 6 or in FIG. 7, the two disks 21, 22 are connected to one another in a manner analogous to the somewhat shortened illustration in FIG. In this case, the pin 25 with its end 50 in FIG. 6 on the left, reduced in diameter, is in a corresponding hole in the disc 21 is pressed. A corresponding bolt section 51 engages in a bore in the disk 22 with a precise fit. This is followed by a bolt end designed as a threaded bolt 52, which projects beyond the outer surface of the disk 22 and onto which a nut 53 is screwed. It can be secured by a split pin 54. In addition, according to example 6, there are additional bolts 55, the bolt ends of which have a reduced cross section and engage in corresponding bores in the disks 21 and 22, analogously to the bolt 25. They have the function of spacer bolts. In addition, in conjunction with the rear extension 41 according to FIGS. 5 and 7, they have a function as a stop of a swing-out limiting device fixed to the housing. For an adjustable travel distance of the bearing block 23 to the outside, the bolt 55 can be eccentric and rotatable in a manner not shown. FIG. 6 also shows that the entire device is rotatably mounted on a sleeve 63 by means of suitable roller bearings 61, 62. The front eyelet 8 (FIG. 1) can be attached to this. A nut 64 and an inner collar 65 of the sleeve ensure axial securing together with a cover 66.

The cutting steel 12 can be displaced and locked in the approximately radial direction of the disks 21 and 22. The locking screw 37 for locking the set position of the cutting steel 12 is chosen to be relatively small compared to the embodiment of FIG. 2 in the embodiments of FIGS. 5 to 7; In addition, a pressure piece 47 is connected between the inner end of the set screw 37 and the square or rectangular shank 43 of the cutting steel 12 with the cutting plate 42. Both this and the facing surface of the cutting steel 12, which is preferably rectangular in cross section, have a Fine toothing equipped, which are designated in Figure 5 and 7 with 48 and 49. This allows the cutting steel 12 to be adjusted very sensitively in the direction of the arrow 28 and locked securely.

The pressure piece 47 is perpendicular to the image plane and thus parallel to the geometric axis 29 of the device or the two circular disks 20 and 21, and can be displaced and locked. Cross bolts 57 also extend in the same direction on each bearing block 23. A tension spring element, here in the form of a rubber ring 58, is guided over all - in this exemplary embodiment three - cross bolts 57, which consequently takes on a triangular shape (FIGS. 5 and 7). In the initial position, that is to say when the bearing blocks 23 are pivoted back, the rubber ring is preferably slightly pretensioned and the bearing blocks 23 lie against inner stops 56 which are fixed to the housing and serve as fixed points for the application-dependent adjustment of the adjustment length of the shaft 43 of the cutting beam 12. As soon as the bearing blocks are pivoted about the geometric axis 60 in the direction of arrow 59 due to the centrifugal force, the rubber ring 58 is tensioned or tensioned even more. As a result, together with the cross bolts 57, it forms a resilient return device for the bearing blocks 23, which are pivoted back against the arrow 59 into the starting position (against the stops 56) when the centrifugal force ceases.

The variant of FIG. 7 differs from the other two above all in that the support member 33 and the cutting steel 12 form a unit with the cutting or hard metal plate 42 and are provided on the square shaft 43. If so with the aid of the Locking screw 37, the pressure piece 47 and the shaft 43, the position of the support member 33 on the bearing block 23 is adjusted, so an adjustment takes place at the same time or setting the cutting edge 20 with respect to the bearing block 23 instead. The conditions according to FIG. 7 are such that the support surface 34 of the support member 33 and the cutting edge 20 of the cutting steel 12 or, if present, their cutting plate 42 rotate on one and the same circular path, for example 18 or 19. Under no circumstances, however, does the cutting edge 20 rotate on a larger circular path than the support surface 34, but at most on a smaller one.

It goes without saying that, instead of the three bearing blocks described, fewer or more bearing blocks can also be provided, depending on the pipe diameter to be processed.

Claims

P A T E N T A N S P R Ü C H E

Device for removing objects protruding into the inside of a tube (1), such as deposits, circumferential inner welding beads (4) and the like, with a drivable rotating tool, the device being fitted with skids (6), rollers and similar sliding or rolling devices the inner tube wall (7) can be supported centrally and can be transported by means of a feed drive (15) through the tube (1), the tool further being at least one that is centrifugal against the resistance of a common or a resilient resetting device (27; 57, 58) from the inside is outward, against the inner tube wall (7) movable cutting tool (12, 42), and wherein εich the or each cutting edge (20) is at a stationary drive approximately on an imaginary circle that is smaller than the inner tube diameter (7), thereby characterized in that each cutting tool (12, 42) is located on a bearing block (23) which is approximately para All axis to the geometrical axis (13) of the tube (13) is pivotably mounted on a holder (11) of the device at least to a limited extent.

2. Apparatus according to claim 1, characterized in that the bearing block (23) is a one-armed lever and the cutting edge (20) of each cutting tool (12, 42) is located at a radial distance from the geometric Schwenkachεe (60) deε bearing block (23) .

3. Apparatus according to claim 2, characterized in that the cutting edge (20) of each cutting tool is located on a cutting steel (12) which can be set and locked transversely to the longitudinal extension of the one-armed lever (23).

4. Apparatus according to claim 3, characterized in that the holder (11) has a plurality of cutting steels (12) or similar cutting tools, the cutting edges (20) of which rotate in working position on flight circles of different sizes (e.g. 18, 18a, 18b).

5. Apparatus according to claim 4, characterized in that the cutting steels (12) or cutting tools are arranged uniformly on the circumference of a substantially rotationally symmetrical holder (11).

6. The device according to claim 5, characterized in that the different sized effective circles (eg 18, 18a, 18b) of the cutting edges (20) Cutting tools (12, 42) in the axial direction (13) of the tube (1) are offset from one another (30, 31, 32), the smallest effective flight circle (eg 18b) in front of the middle one (18a) seen in the feed direction (5) of the device ) and this is located in front of the largest flight circle (e.g. 18).

Device according to at least one of claims 1 to 6, characterized in that the holder (11) has two spaced, in particular circular disks (20, 21) between which there are the pivotably mounted bearing blocks (23).

Device according to at least one of Claims 1 to 7, characterized in that it has a longitudinal groove (36), which is preferably closed at both ends and into which an actuatable clamping member (37) of the bearing block (23) engages.

Device according to one of claims 1 to 7, characterized in that for setting the working flight circle (18, 19) of each cutting steel (12), its shank (43) has fine toothing (49) into which a counter toothing (49) of a pressure piece (47) intervenes.

10. The device according to claim 9, characterized in that the shaft (43) of the cutting steel (12) also forms an anti-rotation device for the latter.

11. The device according to at least one of claims 1 to 10, characterized in that a tension spring (27), in particular a screw tension spring, is inserted between the bearing block (23) and a holding element on one of the disks (20, 21).

12. The device according to at least one of claims 1 to 10, characterized by a common resilient resetting device consisting of a rubber ring (58) or the like consisting of at least one transverse bolt (57) of each bearing block (23) or deε cutting steel (12). is led.

13. The device according to at least one of claims 1 to 12, characterized in that there is a support member (33) on each bearing block (23), whose support surface (34) rotates in operation on a flight circle which is equal to or larger than the flight circle (e.g. 18) of the most swung out cutting steel (12).

14. The device according to at least one of claims 1 to 3, characterized in that the support member (33) on the bearing block (23) is displaceable and lockable to the outside.

15. The device according to at least one of claims 1 to 14, characterized in that the support member (33) with the cutting steel (12) forms a displaceable and lockable unit on the bearing block (23).

16. The apparatus according to claim 15, characterized in that the unit made of support member (33) and cutting steel (12) means εε on the bearing block (23) verεtell- and fixable holding plate (47) lockable iεt, both of which can be coupled via a serration (48) are.

17. The device according to at least one of claims 1 to 16, characterized in that a projection (41) pointing away from the rotary axis (25 or 60) of the bearing block (23) or similar rear projection (41) together with a stop (40, 55) fixed to the housing. forms a swing-out limiting device.

18. The apparatus according to claim 17, characterized in that the stop fixed to the housing (55) is formed by a rotatable eccentric bolt.

19. The device according to at least one of claims 1 to 18, characterized in that an inner housing-fixed stop (56) is provided as a pivoting-in limitation device.