DE20020499U1 - Tool for slitting plate-like workpieces - Google Patents

Description

TELEPHONE: 0711/7847^1· .TELE EJAX ^"o^ \i\\ 8 »0 9 9 5 / 9 6

KÖHLER SCHMID + P. RUi^PMAWNSTE*.*'2V D-*?05S*5 STUTTGART

KÖHLER SCHMID + PARTNER

PATENT ATTORNEYS

24 303 Sl/te

Trumpf GmbH + Co.
Johann-Maus-Strasse 2 71254 Ditzingen

The invention relates to a tool for slitting plate-like workpieces, in particular sheet metal, with two tool parts which are opposite one another in the transverse direction of the workpiece and can be moved relative to one another in a stroke direction transverse to the workpiece, wherein one tool part has at least two longitudinal slotting cutting edges which run at an angle to the workpiece surface in the slotting direction and are spaced apart from one another transversely to the slotting direction and transversely to the stroke direction, and at the longitudinal end of the longitudinal slotting cutting edges which is located towards the workpiece in the stroke direction, a slotting cross-cutting edge running transversely thereto, and wherein the other tool part has at least two longitudinal slotting cutting edges which run in the slotting direction and transversely thereto

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and longitudinal slot cutting edges spaced apart from one another transversely to the stroke direction, at least one longitudinal end of the longitudinal slot cutting edges having a transverse slot cutting edge running transversely thereto and interacting with the cross slot cutting edge on the other tool part, and a cross cutting edge on a cutting edge carrier which runs between the longitudinal slot cutting edges at a distance from their longitudinal ends and transversely to the longitudinal slot cutting edges, wherein the tool parts can be moved relative to one another in the stroke direction with slot strokes while creating a workpiece strip by means of the longitudinal slot cutting edges or by means of the longitudinal slot cutting edges and the cross slot cutting edges, and with at least one cutting stroke while cutting the created workpiece strip by means of the cutting edge.

When slitting, a workpiece strip is cut free from the workpiece in question, which lengthens as the workpiece processing progresses. If the slit created is of a corresponding length, the cut-free workpiece strip would have a length that could hinder the processing process. For this reason, the workpiece strip is known to be cut from time to time during the processing process. Slitting tools are currently being proposed for this purpose, as described at the beginning and as disclosed in JP 61-154721 A.

The previously known tool comprises two tool parts in the form of a lower tool that supports the workpiece to be machined and an upper tool that can be raised and lowered in the lifting direction relative to the lower tool. A slot-like opening is provided on the lower tool, the longitudinal edges of which run in the direction of the slot serving as slot longitudinal cutting edges. At one of the longitudinal ends of the slot longitudinal cutting edges, a slot cross cutting edge runs transversely to these. From the other longitudinal end of the slot longitudinal cutting edges of the lower tool, a ramp extends between them diagonally downwards into the interior of the slot-like opening. This ramp ends with a step that is spaced in the direction of the slot from the said slot cross cutting edge of the lower tool. The edge area of the step that runs transversely to the direction of the slot forms a cutting edge.

The longitudinal cutting edges on the previously known upper tool are each distributed over two slot cutting edge supports adjacent to each other in the slot direction, which are movable relative to each other in the stroke direction against a restoring force. On the slot cutting edge support at the rear in the slot direction, a slot cross cutting edge runs at the relevant longitudinal end of the slot longitudinal cutting edges, which interacts with the slot cross cutting edge on the lower tool. The parting line between the two slot cutting edge supports of the upper tool runs at the level of the cutting edge on the lower tool transverse to the slot direction.

The slot cutting edge carrier at the rear in the slot direction is designed as a cutting edge on its side facing the slot cutting edge carrier adjacent to it.

When operating the slotting tool according to JP 61-154721 A, the slotting cutting edge carriers of the upper tool are inserted into the slot-like opening on the lower tool. With the interaction of the slot longitudinal and slot transverse cutting edges of the two tool parts, a workpiece strip is cut free on three sides, namely on the two long sides running in the slot direction and on the transverse side at the back in the slot direction. Opposite the cut-free transverse side in the slot direction, the workpiece strip is still connected to the unslotted workpiece. If this connection is to be separated, as is necessary when creating slots that end in the interior of the workpiece, the previously known upper and lower tools must be rotated synchronously by 180° about a tool rotation axis running in the stroke direction before the previously partially cut-free workpiece strip can be completely separated from the workpiece with a final stroke of the previously known tool.

The present invention aims to provide a simplification in this regard.

According to the invention, this object is achieved by a tool of the type described at the outset, which has the characterizing features of claim 1. Due to the features according to the claims, the invention requires a rotary drive for one of the tool parts. Before the last slotting stroke, only this one tool part has to be rotated about the tool rotation axis, the other tool part can remain in its previously assumed rotation position.

Preferred embodiments of the invention emerge from the dependent claims 2 to 4.

In the case of the inventive design according to claim 2, the tool part supporting the workpiece and thus continuously in contact with the workpiece maintains its previously assumed rotational position with respect to the tool rotation axis during the last slotting stroke. Accordingly, material stress, in particular scratching of the workpiece, is avoided, as would be feared if the tool part supporting the workpiece were rotated relative to the workpiece.

By means of a tool according to the invention as defined in claim 3, the workpiece strip created during slitting of the workpiece in question can be cut free by shear cutting as well as cut by serration cutting.

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The variant of the invention described in claim 4 is characterized in that the claimed slot cutting edge supports reliably form a unit with correspondingly offset-free slot longitudinal cutting edges during the slotting strokes to be carried out and are nevertheless movable relative to one another in the required manner during the cutting strokes to be carried out. An offset-free course of the slot longitudinal cutting edges on the slot cutting edge supports during the slotting strokes is necessary in the interest of creating smooth cutting surfaces that are free of markings and are therefore suitable as visible surfaces on the longitudinal edges of the slots created that run in the slotting direction.

The invention is explained in more detail below using schematic representations of exemplary embodiments. They show:

Fig. 1 is a perspective overall view of a machine tool with a tool of the first type for slitting sheet metal installed at a processing station of the machine,

Fign. Individual sectional views of the tool according to 2 to 6 Fig. 1 in different phases of sheet metal processing,

Fign. Fign. 4 to 6 corresponding individual sectional views 7 to 9 of a tool of the second type for slitting sheet metal and

Fig. 10 a sectional view of the tool according to the

Figs. 7 to 9 with a cutting plane in Fig. 7 perpendicular to the drawing plane and in the direction of the line X-X.

As shown in Fig. 1, a machine tool 1 has, in a known manner, a substantially C-shaped machine frame 2. The latter has an upper frame leg 3 and a lower frame leg 4.

At the free end of the upper frame leg 3 there is a processing station 5 with a ram 7 that can be hydraulically raised and lowered in a stroke direction indicated by a double arrow 6. This has a tool holder 8 at its lower end, in which a tool part in the form of an upper tool 9 of a tool 10 for slitting sheet metal is installed. The ram 7 with the upper tool 9 can be rotated in a controlled manner in the direction of a double arrow 11 about a tool rotation axis 12 running in the stroke direction 6. In Fig. 1 you can see a front slitting cutting edge carrier 13 and a rear slitting cutting edge carrier 14 of the upper tool 9, which form longitudinal slitting cutting edges 15, 16.

A lower tool 17, which is integrated into a workpiece table 18 on the lower frame leg 4, is assigned to the upper tool 9 on the ram 7 as a further tool part. The lower tool 17 has a slot opening 19, which in turn is delimited by longitudinal edges forming longitudinal cutting edges 20, 21.

As usual, a coordinate guide 22 is mounted on the lower frame leg 4 next to the workpiece table 18. By means of the coordinate guide 22, workpieces to be machined, in the example shown a sheet metal 23, can be moved in a known manner relative to the processing station 5 in a horizontal plane defined by coordinate axes x, y. In addition, the coordinate guide 22 is used - as is also known - for holding and for changing tools at the processing station 5. Like the other functions of the machine tool 1, the movement of the coordinate guide 22 is also controlled by a computer control 24 indicated in Fig. 1.

The structural design of the tool 10 can be seen in detail in Figs. 2 to 6.

Accordingly, the upper tool 9 of the tool 10 has a base body 26, to which the rear slot cutting carrier 14 is firmly connected and which supports the front slot cutting

the carrier 13 of the upper tool 9 in the stroke direction 6. A connection between the front slot cutter carrier 13 and the base body 26 of the upper tool 9 is established by means of a toggle lever 27, one lever 28 of which is hinged externally to the base body 26 and the other lever 29 of which is hinged externally to the front slot cutter carrier 13. A knee joint 30 of the knee lever 27 is arranged inside a joint sleeve 31 which is rotatable relative to the knee joint 30.

The toggle lever 27 is part of a locking device 32 of the slotted cutting edge carriers 13, 14, which comprises a locking lever 33 pivotably mounted on the base body 26 of the upper tool 9 as a further locking element. A control slide 34 is used to control the pivoting position of the locking lever 33 and thus to control the switching position of the locking device 32. This control slide 34 is guided on the base body 26 of the upper tool 9 so that it can move in the stroke direction 6 and is acted upon by a return spring 35 supported on one side on the base body 26. The end of the control slide 34 on the workpiece side is formed by a button 36.

Parts of the slot longitudinal cutting edges 15, 16 of the upper tool 9 are provided on the front slot cutting edge carrier 13 and the rear slot cutting edge carrier 14. The slot longitudinal cutting edges 15, 16 run at an angle to the surface of the sheet 23 and thereby with increasing angles in a slot direction 40.

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the distance from the sheet 23. The rear slot cutting edge carrier 14 forms a slot cross cutting edge 41 running transversely to the slot longitudinal cutting edges 15, 16 at its rear end and thus at the longitudinal end of the slot longitudinal cutting edges 15, 16 located in the stroke direction 6 towards the sheet 23. The end face of the rear slot cutting edge carrier 14 facing the front slot cutting edge carrier 13 is provided with a cutting edge 3 7 on its workpiece-side edge. The slot longitudinal cutting edges 15, 16 on the upper tool 9 are offset-free at the start of the machining process.

The parting line between the front slot cutting edge carrier 13 and the rear slot cutting edge carrier 14 and thus also the parting line between the parts of the slot longitudinal cutting edges 15, 16 provided on the slot cutting edge carriers 13, 14 is at the level of a cutting edge 38 which is formed on a cutting edge carrier in the form of a cutting block 39 inside the slot opening 19 of the lower tool 17. The cutting edge 38 is set back from the slot longitudinal cutting edges 20, 21 on the lower tool 17 in the stroke direction 6. Slot cross cutting edges 42, 44 running transversely thereto are provided at the two longitudinal ends of the slot longitudinal cutting edges 20, 21. The cutting block 39 is spaced apart from both slot cross cutting edges 42, 44 in the slot direction 40. On both sides of the cutting block 3 9, free spaces 45, 46 remain between the latter and the slot cross-cutting edges 42, 44.

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Fig. 1 shows the machine tool 1 after creating a slot 25 in the sheet metal 23. The processes preceding this operating state are essentially shown in Figs. 2 to 6.

First, the still unprocessed sheet 23 was moved by means of the coordinate guide 22 into its processing starting position opposite the processing station 5 of the machine tool 1. At this time, the tool 10 for slitting the sheet 23 was already installed at the wet processing station 5. The upper tool 9 was spaced from the sheet 23 in the stroke direction 6.

The upper tool 9 of the tool 10 was then moved in the stroke direction 6 to the sheet metal 23 supported in the direction of gravity by the workpiece table 18 and the lower tool 17. The locking device 32 inside the upper tool 9 was initially in its locking position. The locking lever 33 - acted upon by the return spring 35 via the control slide 34 - assumed its horizontal pivoting position in which it supported the knee joint 30 of the knee lever 27 against deflection. The longitudinal cutting edges 15, 16 of the upper tool 9 ran without offset and with an increasing distance in the slot direction 40 from the surface of the sheet metal 23. In this state, the upper tool 9 initially ran with the

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Slot cross cutting edge 41 on the rear slot cutting edge carrier 14 onto the surface of the sheet 23 (Fig. 2).

As the working stroke continued, the upper tool 9 then plunged with the slot longitudinal cutting edges 15, 16 and the slot cross cutting edge 41 into the slot opening 19 of the lower tool 17, specifically into the free space 45 located there. The slot cross cutting edge 41 and the slot longitudinal cutting edges 15, 16 on the slot cutting edge supports 13, 14 of the upper tool 9, which form a unit due to their locking, worked together with the slot cross cutting edge 42 and the slot longitudinal cutting edges 20, 21 on the lower tool 1.7. In a phase of the working stroke referred to as the "slot stroke", a workpiece strip in the form of a sheet metal strip 4 3 was cut free on three sides. Due to the height offset of the cutting block 3 9 or the cutting edge 38 provided thereon compared to the slot longitudinal cutting edges 20, 21 of the lower tool 17, the sheet metal strip 43 extended in the slot direction 40 beyond the cutting edge 38 of the lower tool 17.

During the initial working stroke of the tool 10, the control slide 34 had initially moved synchronously with the upper tool 9 in stroke direction 6. During the slotting stroke, the control slide 34 then hit the top of an unprocessed area of the sheet 23 with the probe 36. During the rest of the slotting stroke, the control slide

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34 is then displaced upwards relative to the upper tool 9 in the stroke direction 6. The relative movement carried out by the control slide 34 with respect to the upper tool 9 until the end of the slotting stroke had not yet led to a change in the pivot position of the locking lever 33 inside the upper tool 9. The reason for this was the play in movement between the control slide 34 and the locking lever 33 in the stroke direction 6. Accordingly, the front slotting cutter carrier 13 and the rear slotting cutter carrier 14 of the upper tool 9 were connected to form a rigid unit with offset-free slotting longitudinal cutters 15, 16 via the locking device 32 until the end of the slotting stroke. Overall, the conditions shown in Fig. 3 resulted immediately before the end of the first slotting stroke carried out by the tool 10.

Due to the continuation of the working stroke carried out by the tool 10 or the upper tool 9, the control slide 34 then moved further upwards in the stroke direction 6 relative to the upper tool 9 against the effect of the return spring 35. In doing so, the control slide 34 took the locking lever 33 with it, which initially assumed its locking position. The knee joint 30 of the knee lever 27 was free to deflect as a result of the change in position of the locking lever 33 caused by the control slide 34 and could move to the left starting from its position according to Fig. 3. The joint sleeve 31 of the knee joint 30 rolled

It rests with little friction on the partially rounded end of the locking lever 33 facing it.

At the same time, the front slot cutting carrier 13 was supported by the cutting block 3 9 in the direction of the working stroke of the upper tool 9 via the sheet metal strip 43 and was thus blocked from moving further in the working stroke direction. By switching the locking lever 33 to the release position, i.e. by switching the locking device 32 to the unlocking position, the front slot cutting carrier 13 was enabled to move in the stroke direction 6 relative to the base body 26 of the upper tool 9 and thus relative to the rear slot cutting carrier 14. The rear slot cutting carrier 14 therefore penetrated deeper into the free space 45 on the lower tool 17 when the front slot cutting carrier 13 was supported on the cutting block 3 9. The cutting edge 37 on the rear slot cutting edge carrier 14 was thereby freed and could cut the previously produced sheet metal strip 43 in conjunction with the cutting edge 38 on the cutting block 39. The operating situation at the end of the cutting stroke, i.e. at the end of that phase of the working stroke of the tool 10 in which the previously produced sheet metal strip 43 was severed, is illustrated in Fig. 4.

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Fig. 4 shows the upper tool 9 in its lower end position. Starting from this position, the upper tool 9 was raised in the stroke direction 6 opposite to the direction of the previously executed working stroke. Under the effect of the return spring 3 5, the control slide 34 initially moved relative to the upper tool 9. This was accompanied by a return of the locking lever 3 3 from its release position according to Fig. 4 into its locking position according to Figs. 2 and 3 and thus a transfer of the locking device 32 into the locking position.

After the upper tool 9 was raised so far that the slot cross-cutting edge 41 of the rear slot cutting edge carrier 14 was positioned a short distance above the sheet 23, the sheet 23 was moved relative to the processing station 5 and thus relative to the tool 10 in the direction of the x-axis using the coordinate guide 22 of the machine tool 1. As a result, the sheet 23 came to lie between the upper tool 9 and the lower tool 17 of the tool 10 with an area extending in extension of the slot created during the initial working stroke. Further working strokes of the tool 10 then followed with the processes described in detail above.

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Before the last working stroke, i.e. before the working stroke for cutting free the transverse boundary of the slot 25 located in the cutting direction 40, the upper tool 9 in its upper end position was rotated by 180° about the tool rotation axis by means of a corresponding drive with the ram 7 integrated in the upper frame leg 3 of the machine frame 2. The lower tool 17 retained its original rotational position with respect to the tool rotation axis 12. The rotated upper tool 9 was then moved to the lower tool 17 by moving the ram in the stroke direction 6. The upper tool 9 initially came to rest on the upper side of the sheet 23 with the slot cross cutting edge 41 of the rear slot cutting edge carrier 14 (Fig. 5). Due to the inclination of the slot longitudinal cutting edges 15, 16 of the upper tool 9 and due to the recessed arrangement of the cutting block 3 9 and its distance from the boundary of the lower tool 17 in the slot direction 40, the upper tool 9 could then, during continued working stroke, penetrate with its slot longitudinal cutting edges 15, 16 and with its slot cross cutting edge 41 so far into the slot opening 19, specifically into the free space 46 of the lower tool 17, that the slot 25 in the sheet 23 was completely cut free starting from its cross boundary in the slot direction 40. During this last working stroke of the tool 10, the slot longitudinal cutting edges 15, 16 of the upper tool 9 interacted with the slot longitudinal cutting edges 20, 21 of the lower tool 17 and the slot cross cutting edge 41 of the upper tool 9.

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tool 9 with the slot cross cutting edge 44 of the lower tool 17 (Fig. 6).

After completion of the slot 2 5 , the upper tool 9 was then raised again to a position above the sheet 2 3 and finally rotated about the tool rotation axis 12 into its original position. The sheet 23 itself was moved by means of the coordinate guide 22 in the direction of the y-axis into its position shown in Fig. 1.

A tool 110 for slitting sheet metal, as shown in Figures 7 to 10, differs from the previously described tool 10 in that its upper tool 109 has a one-piece slitting blade carrier 113. The upper tool 10 9 can be installed in place of the upper tool 9 of the tool 10 in the tool holder 8 on the ram 7 of the machine tool 1. The lower tool that interacts with the upper tool 109 is identical in construction to the lower tool 17 according to Figures 1 to 6. Corresponding components are assigned identical reference numerals in Figures 1 to 10.

In order to enable a sheet 23 to be machined in the desired manner, regardless of the one-piece design of the slot cutting edge carrier 113 on the upper tool 109 in cooperation with the lower tool 17, slot longitudinal cutting edges

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115, 116 on the upper tool 109 are inclined more strongly towards the surface of the sheet 23 than the slot longitudinal cutting edges 15, 16 on the upper tool 9 of the tool 10. Corresponding to the conditions in the case of the upper tool 9, a slot transverse cutting edge 141 (in particular Fig. 10) extends transversely to the longitudinal end of the slot longitudinal cutting edges 115, 116 lying towards the sheet 23 in the stroke direction 6.

The workflow when using the tool 110 is essentially the same as the workflow previously described for Figures 1 to 6. A deviation occurs when cutting the previously created sheet metal strip 43. While the sheet metal strip 43 is cut using the tool 10 by shear cutting (Fig. 4), the sheet metal strip 43 is cut on the tool 110 by biting cutting (Fig. 7). There is agreement in the functioning of the tools 10, 110, in particular with regard to the rotation of the upper tools 9, 109 relative to the lower tool 17 before the last working stroke (Figs. 5, 6; Figs. 8, 9).

Claims (4)

1. Tool for slitting plate-like workpieces, in particular metal sheets ( 23 ), with two tool parts ( 9 , 17 ; 109 , 17 ) which are opposite one another in the transverse direction of the workpiece and can be moved relative to one another in a stroke direction ( 6 ) transverse to the workpiece, wherein the one tool part ( 9 , 109 ) has at least two slot longitudinal cutting edges (15, 16; 115, 116) which run at an angle to the workpiece surface in the slot direction ( 40 ) and are spaced apart from one another transversely to the slot direction ( 40 ) and transversely to the stroke direction ( 6 ), and at the longitudinal end of the slot longitudinal cutting edges ( 15 , 16 ; 115 , 116 ) which is located towards the workpiece in the stroke direction (6), a slot transverse cutting edge (41, 141 ) which runs transversely thereto . and wherein the other tool part ( 17 ) has at least two slot longitudinal cutting edges ( 20 , 21 ) running in the slot direction ( 40 ) and spaced apart from one another transversely thereto and transversely to the stroke direction ( 6 ), at at least one longitudinal end of the slot longitudinal cutting edges ( 20 , 21 ) a slot transverse cutting edge ( 42 , 44 ) running transversely thereto and interacting with the slot transverse cutting edge ( 41 , 141 ) on the other tool part ( 9 , 109 ), and a capping edge ( 38 ) on a capping edge carrier ( 39 ) which runs between the slot longitudinal cutting edges ( 20 , 21 ) at a distance from their longitudinal ends and transversely to the slot longitudinal cutting edges ( 20 , 21 ), wherein the tool parts ( 9 , 17 ; 109 , 17 ) with slot strokes while creating a workpiece strip ( 43 ) by means of the slot longitudinal ( 15 , 16 , 20 , 21 ; 115 , 116 , 20 , 21 ) or by means of the slot longitudinal ( 15 , 16 , 20 , 21 ; 115 , 116 , 20 , 21 ) and the slot cross cutting edges ( 41 , 42 , 44 ; 141 , 42 , 44 ) and with at least one cutting stroke while cutting the created workpiece strip ( 43 ) by means of the cutting edge ( 38 ) in the stroke direction ( 6 ), characterized in that the tool parts ( 9 , 17 ; 109 , 17 ) can be rotated by 180° relative to one another about a tool rotation axis ( 12 ) running in the stroke direction ( 6 ), and that on the tool part ( 17 ) provided with the cutting edge carrier ( 39 ), at both longitudinal ends of the slot longitudinal cutting edges ( 20 , 21 ), slot cross cutting edges ( 42 , 44 ) are provided which run transversely thereto and interact with the slot cross cutting edge ( 41 , 141 ) on the other tool part ( 9 , 109 ), wherein the cutting edge carrier ( 39 ) is spaced from both slot cross cutting edges ( 42 , 44 ) in the slot direction ( 40 ), with a free space ( 45 , 46 ) being formed on both sides in the slot direction ( 40 ) for the immersion of the slot longitudinal cutting edges ( 15 , 16 ; 115 , 116 ) and the slot cross cutting edge ( 41 , 141 ) on the other tool part ( 9 , 109 ). 2. Tool according to claim 1, characterized in that one ( 9 , 109 ) of the tool parts ( 9 , 17 ; 109 , 17 ) is provided as an upper tool and the other ( 17 ) of the tool parts ( 9 , 17 ; 109 , 17 ) is provided as a lower tool supporting the workpiece ( 23 ) and the upper tool ( 9 , 109 ) is rotatable relative to the lower tool ( 17 ) by 180° about the tool rotation axis ( 12 ). 3. Tool according to one of the preceding claims, characterized in that at the level of the cutting edge ( 38 ) on the cutting edge carrier ( 39 ) of one tool part ( 17 ), the slot longitudinal cutting edges ( 15 , 16 ) on the other tool part ( 9 ) are divided and that adjacent slot cutting edge carriers ( 13 , 14 ) are provided in the slot direction ( 40 ), of which one slot cutting edge carrier ( 14 ) has the slot transverse cutting edge ( 41 ) of the relevant tool part ( 9 ), a part of the slot longitudinal cutting edges ( 15 , 16 ) and, on its side facing the other slot cutting edge carrier ( 13 ), a cutting edge ( 37 ) running transversely to the slot longitudinal cutting edges ( 15 , 16 ), and of which the other slot cutting edge carrier ( 13 ) is connected to the remaining slot longitudinal cutting edges ( 15 , 16 ) of the relevant tool part ( 9 ), wherein the slotted cutting edge carriers ( 13 , 14 ) are movable relative to one another in the stroke direction ( 6 ) during a cutting stroke while supporting the slotted cutting edge carrier ( 13 ) provided with the remaining slotted longitudinal cutting edges ( 15 , 16 ) on the cutting edge carrier ( 39 ) of the other tool part ( 17 ) while cutting the previously produced workpiece strip ( 43 ) by means of the cutting edge ( 37 ) on the relevant slotted cutting edge carrier ( 14 ) of the one tool part ( 9 ) and the cooperating cutting edge ( 38 ) on the cutting edge carrier ( 39 ) of the other tool part ( 17 ). 4. Tool according to one of the preceding claims, characterized in that the slot cutting carriers ( 13 , 14 ) are provided with a locking device ( 32 ) which can be switched in a controlled manner into a locking or an unlocking position, wherein the slot cutting carriers ( 13 , 14 ) are connected to one another by means of the locking device ( 32 ) switched into the locking position during the slotting strokes and, when the locking device ( 32 ) is switched into the unlocking position, are movable relative to one another in the stroke direction ( 6 ) during the at least one cutting stroke.