System with laser scanner and protective contour

Abstract

The present invention relates to a system (1) for securing a protective field (2) against object entry, comprising a laser scanner (3) prepared to scan the protective field (2) by means of laser beams in order to detect object entry; a protective wall (4) with a protective surface (5) facing the protective field (2), wherein a buffer gap (6) is located between the protective wall (4) and the protective field (2); and a protective contour (7) arranged on the protective wall (4) and having an offset (8) relative to the protective surface (5), wherein one dimension of the offset (8) exceeds one dimension of the buffer gap (6) in order to counteract an object entering the buffer gap (6).

Description

Technical area

[0001] The present invention relates to a system for protecting a protective field against object entry. State of the art

[0002] Laser processing systems, especially multi-axis laser processing systems, have become an indispensable technology in many industries in recent years. They can offer high precision and flexibility, enabling efficient processing of workpieces, such as cutting, welding, and / or coating. To increase the safety of laser processing systems, a protective field can be defined that is scanned by a laser scanner. This allows the safeguarding of hazardous points, access points, and / or danger areas. As soon as an object is located in the protective field, for example, the laser scanner can signal the detection by changing the signal at the safety output.

[0003] State-of-the-art systems for safeguarding hazardous areas using a laser scanner are known. The reliability of the laser scanner can be compromised if the protective field extends close to a protective wall. A buffer gap must therefore be provided between the protective field and the protective wall. In practice, a tolerance range of the laser scanner is recommended as the dimension, particularly the depth, for the buffer gap. This is usually several centimeters. If the buffer gap is made smaller, false alarms can be triggered frequently. However, an increased buffer gap reduces the dimension of the protective field, which shrinks the protected danger zone.Even with a buffer gap of the same size as the laser scanner's tolerance range, an object of that size, such as an operator's hand, can be located in the buffer gap without the laser scanner detecting it. This compromises the system's safety. Description of the invention

[0004] Based on the known prior art, it is an object of the present invention to provide an improved system for securing hazardous areas. In particular, the invention aims to increase the safety of a laser processing system. Furthermore, the invention can aim to prevent the triggering of false alarms caused by a protective wall being mistaken for an object entering the system. In particular, the invention aims to prevent the triggering of false alarms while simultaneously increasing the dimensions of the protective field. The protective field should extend in such a way that a hazardous area of ​​the system is optimally covered by the protective field. In particular, the invention can seek to prevent an object with a dimension within the tolerance range of the laser scanner from entering a buffer gap unnoticed by the laser scanner.Thus, the invention can, on the one hand, aim at longer processing times due to shorter false alarm times and, on the other hand, at increased process reliability.

[0005] The problem is solved by a system for protecting a protective field against object entry with the features of claim 1. Advantageous further developments emerge from the subclaims, the description, and the figures.

[0006] Accordingly, a system for protecting a protective field from object ingress is proposed. The system can generally be a machine with hazardous areas or comprise such a machine. For example, the system is a safety system primarily intended to protect the protective field. The system can also be a system for laser welding, laser cutting and / or laser cladding or comprise such a system. An object ingress can be an operator who moves into the protective field, for example, by reaching into it. It can also be a machine part or another object that interacts with the protective field. The protective field can represent the hazardous area to be protected by the laser scanner. It can extend two-dimensionally and have any geometry within the plane. The protective field can be stationary or linked to a process stage of the system.The protective field can be set up to prevent damage to an object that unintentionally interacts with the system.

[0007] The system has a laser scanner configured to scan the protective field using laser beams to detect object entry. The laser scanner can be a non-contact safety device that scans its surroundings, i.e., the protective field, two-dimensionally using laser beams, such as infrared laser beams. As soon as an object is located in the protective field, the laser scanner can signal the detection by a signal change at a safety output. A control unit can safely evaluate this signal change, for example, using a safe controller or a safety relay. The control unit can terminate the dangerous condition by preventing laser radiation and / or shutting down the system. The laser scanner can operate according to the time-of-flight measurement principle. To do this, it emits light pulses at uniform, very short intervals.When the light hits an object, it is reflected, which is detected by the laser scanner. The laser scanner can calculate the distance to the object from the time between the transmission and reception of the light pulse. The laser scanner can contain a rotating mirror that deflects the light pulses so that they scan a flat area.

[0008] The system has a protective wall with a protective surface facing the protective field, with a buffer gap between the protective wall and the protective field. The protective wall can, for example, be a dividing wall in a two-station operation. In two-station operation, there is a first workpiece processing area and a second workpiece processing area, with a movement unit of the system being configured to move the processing head between the first workpiece processing area and the second workpiece processing area. In this way, a workpiece can first be processed in the first workpiece processing area and then the processing head can be moved to the second workpiece processing area in order to process a second workpiece, while, for example, a workpiece is being exchanged in the first workpiece processing area. This guarantees time-efficient processing with high volumes.The protective wall can be provided between the first workpiece processing area and the second workpiece processing area to partially shield an operator from laser radiation. The protective wall can serve to shield a laser beam directed from the first workpiece processing area to the second workpiece processing area. The protective wall can be provided in addition to a protective cabin surrounding the system. The protective surface can be located at least partially within a workpiece processing area. The surface of the protective wall facing a workpiece processing area can represent the protective surface. The buffer gap forms between the protective wall and the protective field. It can have the dimension of a tolerance range of the laser scanner.For example, if the laser scanner can scan a protective field with an accuracy of a few millimeters or a few centimeters, the buffer gap can have a dimension of a few millimeters or a few centimeters. For example, the dimension of the buffer gap is 4 cm to 8 cm, especially 6 cm. The dimension of the buffer gap can be the smallest distance between an outer edge of the protective field and the protective surface of the protective wall.

[0009] The system has a protective contour that is arranged on the protective wall and is offset from the protective surface, wherein one dimension, in particular depth, of the offset exceeds a dimension, in particular depth, of the buffer gap in order to counteract an object staying in the buffer gap. The protective contour can be fixedly attached to the protective wall, in particular to the protective surface of the protective wall. The dimension of the offset can be a distance, in the direction orthogonal to the protective surface, between the protective wall and the point of the offset that is furthest away from the protective wall in the direction orthogonal to the protective surface. If the protective contour is attached to the protective wall in the shape of a triangle, for example, the dimension of the offset is the distance from the tip of the triangle orthogonal to the protective wall. If the protective contour is, for example, a recess in the protective wall, the dimension of the offset is the depth of the recess.If the dimension of the offset exceeds the dimension of the buffer gap, it can be ensured that if an object moves along the protective wall beyond the dimension of the system's tolerance range, object entry is detected, thus increasing safety. Object entry can represent the presence of a moving object. For example, if an operator's hand is guided along the protective wall in such a way that it is temporarily in the buffer gap between the protective field and the protective wall, this represents object entry, which the protective contour according to the disclosure counteracts.

[0010] In this way, if the tolerance range is maintained, which prevents an increased occurrence of false alarms from the laser scanner, an object entry with a dimension equal to the tolerance range can be detected. The geometry of the offset ensures a kind of labyrinth that counteracts and, in particular, prevents undetected interaction between an object and the protective field. The protective field can thus extend into the protective contour, with the distances between the protective field and the protective contour being selected such that the robustness and safety of the system are guaranteed. Intervention by an operator's hand, for example, without interrupting the protective field and thus without triggering a safety output signal can be made difficult or impossible. The geometry of the protective contour can be adapted to the respective requirements of the system and the respective tolerances.In this way, the security of the system can be significantly increased without having to take additional security precautions.

[0011] In one embodiment, the offset is in close proximity to the protective field to prevent an object the size of an operator's hand from staying in the buffer gap. The close proximity can mean that the smallest distance between the protective contour and the protective field is of the order of magnitude of the offset dimension, in particular smaller than the offset dimension. Thus, it can be prevented that an object the size of an operator's hand stays in the buffer gap without being detected by the laser scanner as an object entry. This further contributes to the safety of the system.

[0012] In one embodiment, a course of the protective contour on the protective wall is oriented along a plane of the protective field. The plane of the protective field can describe the orientation of the plane along which the protective field extends relative to the protective wall. For example, the protective field can be inclined so that the protective field extends along a height direction of the protective wall. The course of the protective contour can describe the orientation of the protective contour on the protective wall. If the protective field has a plane inclined relative to the protective wall, the course of the protective contour can be oriented along the corresponding incline.

[0013] In one embodiment, the distance between the protective contour and the protective field is constant along the course of the protective contour. The course of the protective contour can thus follow the plane of the protective field. The proximity of the offset to the protective field thus remains constant along the protective contour, which evenly counteracts the presence of an object in the buffer gap along the protective contour. For example, the protective contour can be formed as at least one projection that extends parallel to the outer edge of the protective field.

[0014] In an alternative embodiment, the distance between the protective contour and the protective field varies along the course of the protective contour, in particular in a step-like manner. The orientation of the course of the protective contour to the plane of the protective field thus ensures that the protective contour follows a higher-level course of the protective field without running beyond the protective contour parallel to the outer edge of the protective field. This allows the distance between the protective contour and the protective field to be adapted to the respective process conditions. This also enables increased flexibility in the design of the protective contour. With a step-like variation, the protective contour can have different sections, each of which runs in a horizontal direction. A section of the protective contour in the horizontal direction can run at an angle to the plane of the protective field.Before the respective section and the plane of the protective field intersect, the next, stepped section follows. This further contributes to increased flexibility in the design of the protective contour.

[0015] In one embodiment, the protective field has an orientation that is inclined in a vertical direction of the protective wall, so that a plane in which the protective wall runs is inclined to a plane in which the protective field runs. The plane in which the protective wall runs can extend along the vertical. The plane in which the protective field runs can extend at an angle to the horizontal. In this way, an angle other than 90° can span the two planes in order to ensure the inclined course of the plane in which the protective wall runs to the plane in which the protective field runs. The fact that the protective field has an inclined orientation in the vertical direction of the protective wall further contributes to the increased flexibility.

[0016] In one embodiment, the protective contour has a first projection mounted on the protective wall. In particular, the protective contour can consist of the first projection. The first projection can be screwed onto the protective surface of the protective wall. The height of the projection can correspond to the depth of the offset. The projection can be shaped like a polygon in cross-section. The projection can be mounted on the protective surface and protrude in the direction of the protective field. It can be offset in the height direction of the protective wall from the plane in which the protective field extends. The projection can therefore be designed such that it does not interact with the protective contour.

[0017] In one embodiment, the protective contour has a second projection attached to the protective wall, wherein the protective field extends at least partially within the first projection and the second projection. The second projection can substantially correspond to the contour of the first projection. In particular, the protective contour can consist of the first projection and the second projection. The second projection can also be screwed onto the protective surface of the protective wall. The height of the second projection can correspond to the height of the first projection. Alternatively, the second projection is higher or lower than the first projection. The second projection can be aligned correspondingly to the first projection and protrude in the direction of the protective field.The protective field can extend at least partially between the first and second projections, such that a connection between an outer point of the first projection and an outer point of the second projection intersects the protective field. If an object is moved along the protective wall over the first projection and the second projection, an interaction between the object and the protective field can be triggered, which contributes to the safety of the system.

[0018] In one embodiment, the at least one projection is attached to the protective surface as a folding sheet, in particular by screwing. The folding sheet can be a sheet metal strip having at least one folding contour along which the sheet metal strip can be folded. The folding sheet can be folded such that the height of the at least one projection adapts individually to the dimension of the buffer gap. The folding sheet can have at least one opening through which a screw can fasten the folding sheet to the protective surface. The protective contour can be formed by a plurality of folding sheets extending on the protective wall according to the orientation of the protective field.

[0019] In one embodiment, the protective contour is a recess, i.e. a depression, or a step that is let into the protective surface. The outer edge of the protective field can run in the recess. The recess can be placed on the protective wall or machined into it. The recess can form a first inner surface and a second inner surface that are intended to accommodate the outer edge of the protective field. The recess can have a polygonal, in particular rectangular, cross-section. The dimension of the recess corresponds to the depth of the offset. The width of the recess can be less than the depth of the recess to further counteract the object remaining in the buffer gap. The protective contour can be shaped as a step that extends into the protective wall. The step can separate an upper protective surface of the protective wall from a lower protective surface.The depth of the step corresponds to the dimension of the offset. Designing the protective contour as a step is particularly suitable when an object is more likely to enter from the direction of the upper protective surface than from the direction of the lower protective surface.

[0020] In one embodiment, the protective surface runs essentially flat in a plane diagonal to the protective field. The flatness is also achieved by the upper protective surface and the lower protective surface, which are separated by the step. Because the protective surface is essentially flat, the dimension of the buffer gap can be constant. The protective contour can be precisely shaped to match this dimension.

[0021] In one embodiment, the system comprises a control unit that is provided and configured to process the object entry and issue an alarm. The control unit can detect the interaction between an object and the protective field detected by the laser scanner based on a signal change at the laser scanner's safety output. It can evaluate this signal accordingly to determine and process the object entry. The control unit is further configured to issue an alarm. As soon as this happens, a system can be shut down to end a hazardous condition. For example, if the system is a laser processing system, the laser processing can be interrupted. Limit values ​​above which the control unit issues an alarm can be defined in the control unit.

[0022] In one embodiment, the system additionally comprises a processing head for aligning a laser beam onto a workpiece and a motion unit for changing the position of the processing head. By aligning the laser beam onto the workpiece, the workpiece can be processed, for example, by welding or cutting. The corresponding processing trajectory can be provided to the processing head by the control unit. The motion unit is adapted to move the processing head according to the processing trajectory and a processing state. The system thus enables customized and flexible processing of workpieces.

[0023] In one embodiment, the system has a first workpiece processing area and a second workpiece processing area, which is at least partially shielded from the first workpiece processing area by the protective wall. This allows the system to implement two-station operation. For example, a workpiece can first be machined in the first workpiece processing area, and then the machining head can be moved to the second workpiece processing area to machine a second workpiece, while, for example, a workpiece is being exchanged in the first workpiece processing area. This guarantees time-efficient processing for high volumes.The movement unit of the system is configured to move the machining head between the first workpiece machining area and the second workpiece machining area, wherein a laser scanner is arranged in each of the first workpiece machining area and the second workpiece machining area, which is prepared to scan a protective field. The system can thus include two laser scanners, each scanning a protective field. If, for example, a workpiece is exchanged in the first workpiece machining area while a workpiece is being machined in the second workpiece machining area, the protective field of the first workpiece machining area can ensure that an operator does not interact with the movement unit of the system, thus increasing the safety of the system. Short description of the characters

[0024] Preferred further embodiments of the invention are explained in more detail in the following description of the figures. In the figures: Fig. 1 shows a first embodiment of a system with a protective contour, in which the protective field extends at least partially within the protective contour, in a schematic view; Fig. 2 shows a second embodiment of the system with a protective contour having a first projection, in a schematic view; Fig. 3 shows a third embodiment of the system with a protective contour having a recess, in a schematic view; Fig. 4 shows a fourth embodiment of the system with a protective contour having a step, in a schematic view; and Fig. 5 a system as a two-station operation with a protective contour as disclosed. Detailed description of preferred embodiments

[0025] Preferred embodiments are described below with reference to the figures. Identical, similar, or equivalent elements in the different figures are provided with identical reference numerals, and a repeated description of these elements is partially omitted to avoid redundancies.

[0026] Fig. 1 shows a system 1 for protecting a protective field 2 from object entry. A laser scanner 3 is configured to scan the protective field 2 using laser beams to detect object entry. The protective field 2 extends as far as a protective wall 4, which extends transversely, in this case orthogonally, to the protective field 2. The protective wall 4 has a protective surface 5 facing the protective field 2. The protective field 2 extends in such a way that a buffer gap 6 is formed between the protective field 2 and the protective wall 4. The buffer gap 6 has a dimension, in this case a depth. This represents the smallest distance between an outer edge of the protective field 2 and the protective wall 4. The depth of the buffer gap 6 is represented in the figures by a curved bracket between the protective field 2 and the protective wall 4.

[0027] The system 1 has a protective contour 7 arranged on the protective wall 4. The protective contour 7 has an offset 8 relative to the protective surface 5. The offset 8 has a depth. This represents the distance, in the direction orthogonal to the protective surface 5, between the protective wall 5 and the point of the offset 8 that is furthest away from the protective wall 4 in the direction orthogonal to the protective surface 5. The dimension, in this case the depth, of the offset 8 is represented in the figures by a double arrow. The depth of the offset 8 exceeds the depth of the buffer gap 6 in order to counteract an object remaining in the buffer gap 6. This can be illustrated as follows: if an object is moved, for example, from bottom to top along the protective surface 5, this object, provided it is smaller than the depth of the buffer gap 6, can remain in the buffer gap 6 without the provision of the protective contour 7.However, because the protective contour 7 is arranged with the offset 8 and its depth, which exceeds the depth of the buffer gap 6, the movement of the object along the protective surface 5 leads to a detection of the object entering the protective field 2 due to the protective contour 7. Because the offset 8 is in the immediate vicinity of the protective field 2, for example, an object the size of an operator's hand is prevented from staying in the buffer gap 6. The immediate proximity can be characterized in that the smallest distance between the protective contour 7 and the protective field 2 is smaller than the depth of the offset 8. The protective contour 7 can have a course along the protective wall 4. The course of the protective contour 7 corresponds to an orientation of the protective field 2. In the exemplary embodiment from . Fig. 1, the protective field 2 extends orthogonally into the plane of the drawing. Accordingly, the protective contour 7 also extends orthogonally into the plane of the drawing. The distance between the protective contour 7 and the protective field 2 is constant along the course of the protective contour. It can also vary, as in the embodiment in Fig. 5 shown.

[0028] The protective contour 7 here has a first projection 9 and a second projection 10. The first projection 9 has a triangular cross-section. In particular, the first projection 9 can be shaped like an isosceles triangle. The first projection can be a folding sheet that is screwed onto the protective wall 4 and folded along a fold to obtain the triangular cross-section. The second projection 10 can have a geometry identical to the first projection 9. The protective field 2 runs at least along the edge facing the protective surface 5 within the first projection 9 and the second projection 10. The protective contour 7 thus encloses the buffer gap 6, which further increases the process reliability guaranteed by the protective contour 7.

[0029] Fig. 2 shows a second embodiment. The protective contour 7 in this case has a first projection 9, which forms the final part of the protective contour 7. The protective contour 7 thus runs on one side along the protective field 2. When an object moves from top to bottom along the protective wall 4, the protective contour 7 causes the object to move in the direction of the protective field 2, which facilitates the detection of an object entry. Because the protective contour is arranged on one side of the protective field 2, this embodiment is characterized by an efficient contribution to increasing process reliability. The depth of the offset 8 in the embodiment according to Fig. 2, the depth of the offset 8 in the embodiment according to Fig. 1 in order to counteract the aspect of lower process reliability due to the one-sided design of the protective contour 7 by increasing the offset 8.

[0030] Fig. 3 shows a third embodiment. The protective contour 7 is implemented here as a recess 11 in the protective surface 5 of the protective wall 4. The recess 11 has a first inner surface 12 and a second inner surface 13. The first inner surface 12 and the second inner surface 13 can each run orthogonally to the protective surface 5. They can also run plane-parallel to the plane along which the protective field 2 extends. The depth of the recess 11 corresponds to the depth of the offset 8. This exceeds the depth of the buffer gap 6. When the protective contour 7 is designed as a recess 11, it is possible to form the protective field 2 beyond a plane along which the protective surface 5 extends. The edge of the protective field 2 thus runs within the protective wall 4. The recess 11 can, for example, be machined into the protective wall 4.

[0031] Fig. 4 shows a fourth embodiment. The protective contour 7 is here implemented as a step 14 in the protective surface 5 of the protective wall 4. The step 14 can form the protective surface 5 of the protective wall 4 along two planes, which are offset by the step 14 by the offset 8 of the protective contour 9. An upper protective surface 15 runs plane-parallel to a lower protective surface 16. The distance between the upper protective surface 15 and the lower protective surface 16 corresponds to the offset 8 of the protective contour 9. This exceeds the depth of the buffer gap 6. The protective field 2 can extend beyond a plane along which the upper protective surface 15 extends. The edge of the protective field 2 thus runs closer to the lower protective surface 16 than the upper protective surface 15.

[0032] Fig.5 shows a system 1 in two-station operation. In two-station operation, the system 1 has a first workpiece processing area 17 and a second workpiece processing area 18. In each workpiece processing area 17, 18, at least one workpiece can be machined. The protective wall 4 is provided between the first workpiece processing area 17 and the second workpiece processing area 18. A processing head of the system 1 can be moved between the first workpiece processing area 17 and the second workpiece processing area 18. When the processing head is in the second workpiece processing area 18, the protective field 2 in the first workpiece processing area 17 is scanned by the laser scanner 3. In this case, the protective field 2 is in a plane that runs obliquely to the protective wall 4.

[0033] The protective contour 7 is attached to the protective wall 4. In this case, it is composed of the first projection 9, the second projection 10, and a third projection 19. The first projection 9 is arranged below the protective field 2. The second projection 10 and the third projection 19 are arranged above the protective field 2. If an operator is in the first workpiece processing area 17 and, for example, moves his hand upwards along the contour of the protective wall 4, the protective contour 7 ensures that the hand is detected as an object entering the protective field 2, even if the buffer gap 6 is between the protective field 2 and the protective wall 4.

[0034] For example, if a workpiece is being machined in the second workpiece processing area 18, a changeover can take place in the first processing area 17 to prepare the system 1 for machining a workpiece in the first workpiece processing area 17. During this changeover, a movement unit in an upper region of the first workpiece processing area can perform a movement. To prevent an operator located in the first workpiece processing area 17 from colliding with the movement unit during such a movement, the laser scanner 3 scans the protective field 2. The protective field 2 has the buffer gap 6 opposite the protective wall 4, which is due to tolerance dimensions of the laser scanner 3.The fact that the laser scanner 3 also detects an operator's movement along the protective wall 4 is due to the protective contour 7, which in this case consists of the first projection 9, the second projection 10, and the third projection 19. In this respect, the protective contour according to the disclosure increases process reliability, particularly in two-station operation.

[0035] Where applicable, all individual features presented in the embodiments may be combined and / or exchanged without departing from the scope of the invention. List of reference symbols 1 system 2 protective field 3 laser scanners 4 protective wall 5 Protective area 6 Buffer gap 7 Protective contour 8 Offset 9 first lead 10 second lead 11 Statement 12 first inner surface 13 second inner surface 14th level 15 upper protective surface 16 lower protective surface 17 first workpiece processing area 18 second workpiece processing area 19 third lead

Claims

[1] System (1) for protecting a protective field (2) against an object entry, with - a laser scanner (3) which is prepared to scan the protective field (2) by means of laser beams in order to detect the entry of the object; - a protective wall (4) with a protective surface (5) facing the protective field (2), wherein there is a buffer gap (6) between the protective wall (4) and the protective field (2); and with - a protective contour (7) which is arranged on the protective wall (4) and which has an offset (8) relative to the protective surface (5), wherein a dimension of the offset (8) exceeds a dimension of the buffer gap (6) in order to counteract an object staying in the buffer gap (6). [2] System (1) according to claim 1, wherein the offset (8) is in close proximity to the protective field (2) in order to counteract an object having the dimension of an operator's hand staying in the buffer gap (6). [3] System (1) according to one of the preceding claims, wherein a course of the protective contour (7) on the protective wall (4) is oriented on a plane of the protective field (2). [4] System (1) according to claim 3, wherein a distance between the protective contour (7) and the protective field (2) is constant along the course of the protective contour (7). [5] System (1) according to claim 3, wherein a distance between the protective contour (7) and the protective field (2) varies along the course of the protective contour (7), in particular varies in a step-like manner. [6] System (1) according to one of claims 3 to 5, wherein the protective field (2) has an orientation inclined in a height direction of the protective wall (4) so ​​that a plane in which the protective wall (4) runs is inclined to a plane in which the protective field (2) runs. [7] System (1) according to one of the preceding claims, wherein the protective contour (7) has a first projection (9) which is mounted on the protective wall (4). [8] System (1) according to claim 7, wherein the protective contour (7) has a second projection (10) mounted on the protective wall (4), wherein the protective field (2) extends at least partially within the first projection (9) and the second projection (10). [9] System (1) according to one of the preceding claims 7 or 8, wherein the at least one projection (9, 10) is attached, in particular screwed, to the protective surface (5) as a folding plate. [10] System (1) according to one of claims 1 to 6, wherein the protective contour (7) is a recess (11) or a step (14) which is recessed into the protective surface (5). [11] System (1) according to one of the preceding claims, wherein the protective surface (5) extends substantially flat in a plane oblique to the protective field (2). [12] System (1) according to one of the preceding claims, further comprising a control unit arranged and configured to process the object entry and to issue an alarm. [13] The system (1) according to claim 12, further comprising a machining head for directing a laser beam onto a workpiece; and a moving unit for changing a position of the machining head. [14] System (1) according to claim 13, with a first workpiece machining area (17) and a second workpiece machining area (18) which is at least partially shielded from the first workpiece machining area (17) by means of the protective wall (4), wherein the movement unit is configured to move the machining head between the first workpiece machining area (17) and the second workpiece machining area (18); wherein a laser scanner (3) is arranged in each of the first workpiece processing area (17) and the second workpiece processing area (18), which laser scanner is prepared to scan a protective field (2).

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