machine tool

Abstract

Machine tool, in particular table saw, with at least one drive unit (12), with at least one workpiece support unit (14) for supporting a workpiece during machining, with at least one linear bearing unit (16) for at least a translationally movable bearing of the drive unit (12) along a linear movement axis (22) of the linear bearing unit (16) extending at least substantially parallel to a workpiece support surface (18) of the workpiece support unit (14), and with at least one extraction fluid guide unit (24) for at least guiding a fluid flow for the extraction of removed workpiece particles, wherein the extraction fluid guide unit (24) comprises at least one extraction fluid guide element (26) that can be fixedly arranged on an edge region of the workpiece support unit (14) which defines at least one tool passage recess (28), characterized in that the extraction fluid guide element (26) has at least one removal inlet opening (40).which extends in a plane that runs at least substantially transversely to the workpiece support surface (18).

Description

State of the art

[0001] Machine tools are already known that comprise a drive unit, a workpiece support unit for supporting a workpiece during machining, a linear bearing unit for a translationally movable bearing of the drive unit along a linear axis of movement of the linear bearing unit that runs at least substantially parallel to a workpiece support surface of the workpiece support unit, and an extraction fluid guide unit for at least guiding a fluid flow for the extraction of workpiece particles. DE 196 05 699 A1 discloses a sawing device in which, for chip disposal, both an extraction device on the protective housing of the saw blade and a further extraction device below the saw cut in the support plate are provided. Furthermore, extraction devices for power tools are known from US 2012 / 0285308 A1, FR 2 947 752 A1 and DE 93 03 813. Disclosure of the invention

[0002] The invention with the features of claim 1 is based on a machine tool, in particular a table saw, with at least one drive unit, with at least one workpiece support unit for supporting a workpiece during machining, with at least one linear bearing unit for at least a translationally movable bearing of the drive unit along a linear axis of movement of the linear bearing unit which runs at least substantially parallel to a workpiece support surface of the workpiece support unit, and with at least one extraction fluid guide unit for at least a guide of a fluid flow for extraction of removed workpiece particles.

[0003] It is proposed that the extraction fluid guide unit comprise at least one extraction fluid guide element that can be fixedly arranged on an edge region of the workpiece support unit, which defines at least one tool passage recess. Preferably, the extraction fluid guide element can be fixedly arranged on the workpiece support unit relative to the workpiece support unit. The machine tool is particularly preferably designed as a benchtop machine tool. In this case, the machine tool is preferably designed as a table saw, an underfloor saw, and / or an underfloor pull saw. However, it is also conceivable that the machine tool has a different configuration that would appear advantageous to a person skilled in the art. The machine tool has, in particular, a mass that is less than 60 kg, preferably less than 40 kg, and most preferably less than 30 kg.Preferably, the machine tool is designed as a stationary machine tool that can be transported by an operator without a transport machine.

[0004] The term "workpiece support unit" here refers in particular to a unit that has at least one workpiece support surface on which a workpiece can be placed for machining. Preferably, the workpiece support unit has at least one stop element, in particular a stop rail, against which the workpiece can be positioned to achieve a precise cut during machining. The workpiece support unit is most preferably formed by a machine tool table, in particular by a machine tool table top. In this case, the workpiece support unit is preferably made of aluminum. However, it is also conceivable that the workpiece support unit is made of another material that would appear suitable to a person skilled in the art.Preferably, the workpiece support unit comprises at least one tool passage recess through which a machining tool device extends, at least in one operating state. The term "extend through" here is intended to define, in particular, an arrangement of a component relative to another component, wherein the component is arranged in a tool passage recess of the other component in at least one operating state and extends beyond at least one edge region of the other component that delimits the tool passage recess. Preferably, the machining tool device extends through the tool passage recess in a direction that is at least substantially perpendicular to the workpiece support surface.

[0005] The machine tool is preferably placed on a suitable surface, such as a worktop and / or a production hall floor, etc., for machining a workpiece, provided the machine tool is handled properly and the base contact surface of the machine tool is placed on a suitable surface.

[0006] The linear bearing unit is preferably designed to positively guide the drive unit along its linear axis during linear movement. For this purpose, the linear bearing unit preferably comprises at least one linear guide element, which is designed to exert a positive force on the drive unit acting transversely to the direction of movement during movement. The linear guide element is particularly preferably designed as a guide rod. However, it is also conceivable that the linear guide element has a different design that would appear advantageous to a person skilled in the art. "Designed" is understood to mean, in particular, specifically designed and / or specially equipped.The phrase "an object and / or unit is intended for a specific function" means, in particular, that the object and / or unit fulfills and / or performs this specific function in at least one application and / or operating state. Preferably, the linear motion axis runs at least substantially parallel to a longitudinal center axis of the tool passage recess. The longitudinal center axis of the tool passage recess runs at least substantially parallel to a boundary edge of the boundary region that delimits the tool passage recess. The tool passage recess has a maximum longitudinal extent along a direction that runs at least substantially parallel to the longitudinal center axis.The term "essentially parallel" here refers in particular to an alignment of a direction relative to a reference direction, especially in a plane, wherein the direction has a deviation from the reference direction of in particular less than 8°, advantageously less than 5° and particularly advantageously less than 2°.

[0007] The term "extraction fluid guide unit" is understood to mean a unit designed to form a fluid channel in which a fluid, in particular extraction air, is guided to remove workpiece particles. Preferably, a fluid flow is generated by means of a fluid flow generation device, in particular a vacuum cleaner, which can be connected to the extraction fluid guide unit. The extraction fluid guide element preferably has a maximum extent when viewed in a plane running at least substantially parallel to the workpiece support surface. Furthermore, the extraction fluid guide element is preferably fixed, in particular immovable, at the edge region of the workpiece support unit that at least defines the tool passage recess. Thus, the drive unit is preferably movable relative to the extraction fluid guide unit by means of the linear bearing unit.The design according to the invention advantageously decouples the extraction fluid unit from the movement of the drive unit, particularly compared to existing table saws. This allows for a low mass that needs to be moved during operation of the drive unit. Furthermore, it advantageously enables a structurally simple and stable connection of the extraction fluid guide element to an external fluid flow generation device, which can be advantageously decoupled from other components, such as a hose connecting the extraction fluid guide element to an extraction port inside the machine tool.

[0008] Furthermore, it is proposed that the extraction fluid guide element has a maximum removal inlet opening extent that corresponds to at least 60% of the maximum longitudinal extent of the tool passage recess, particularly when considered along a direction that runs at least substantially parallel to the linear motion axis. Preferably, the extraction fluid guide element has a maximum removal inlet opening extent that corresponds to at least 80% of the maximum longitudinal extent of the tool passage recess. Particularly preferably, the extraction fluid guide element has a maximum removal inlet opening extent that corresponds to at least 95% of the maximum longitudinal extent of the tool passage recess. A removal inlet opening of the extraction fluid guide element is preferably arranged on a side of the extraction fluid guide element facing the tool passage recess.The material removal inlet opening is preferably bounded along at least three sides by the extraction fluid guide element. The design according to the invention advantageously enables reliable extraction of removed workpiece particles in the area of ​​the tool passage recess. This advantageously results in a low level of contamination in the environment in which the machine tool is operated.

[0009] Furthermore, it is proposed that the extraction fluid guide element, when arranged at the edge region of the workpiece support unit, extends along at least substantially the entire maximum longitudinal extent of the tool passage recess. In particular, when arranged at the edge region of the workpiece support unit, the extraction fluid guide element extends along at least 80% of the total maximum longitudinal extent, preferably along at least 90% of the total maximum longitudinal extent, and most preferably along at least 100% of the total maximum longitudinal extent. Thus, the extraction fluid guide element, especially when viewed along a direction running at least substantially parallel to the longitudinal center axis of the tool passage recess, preferably has a maximum extent that corresponds to at least the entire maximum longitudinal extent of the tool passage recess.However, it is also conceivable that the extraction fluid guide element, particularly when considered along a direction running at least substantially parallel to the longitudinal center axis of the tool passage recess, has a maximum extent that differs from the entire maximum longitudinal extent of the tool passage recess, and in particular is greater than the entire maximum longitudinal extent of the tool passage recess. By means of the embodiment according to the invention, reliable extraction of workpiece particles along the entire longitudinal extent of the tool passage recess can advantageously be achieved.Furthermore, it is advantageous to enable the extraction of removed workpiece particles independently of the position of the drive unit and thus the machining tool device relative to the tool passage recess when the drive unit and thus the machining tool device is moving relative to the tool passage recess.

[0010] Furthermore, it is proposed that the extraction fluid guide unit comprises at least one flow guide element arranged in an extraction chamber bounded by the extraction fluid guide element. Preferably, the flow guide element is formed integrally with the extraction fluid guide element. However, it is also conceivable that the flow guide element is formed separately from the extraction fluid guide element and can be fixed to the extraction fluid guide element by means of at least one fastening element that would appear useful to a person skilled in the art.The term "one-piece" is to be understood in particular as being at least materially bonded, for example by a welding process, an adhesive bonding process, an injection molding process, and / or another process that would appear appropriate to a person skilled in the art, and / or advantageously formed in one piece, such as by being manufactured from a single casting and / or by being manufactured using a single- or multi-component injection molding process, and advantageously from a single blank. The flow guide element is preferably rib-shaped. Here, the flow guide element is preferably designed to direct a fluid flow in a desired direction, which depends on a geometric configuration of the flow guide element. Thus, the flow guide element is preferably designed as a flow guide rib.The design according to the invention advantageously enables uniform extraction of workpiece particles along the entire length of the extraction inlet opening. This allows for a uniform volume flow for the extraction of workpiece particles. Furthermore, it advantageously enables the targeted guidance of a fluid flow to desired sections of the tool passage recess.

[0011] Furthermore, it is proposed that the extraction fluid guide element can be arranged on the workpiece support unit on a side facing away from the workpiece support surface. Preferably, the extraction fluid guide element is arranged on a side of the workpiece support unit facing the base contact surface of the machine tool. The side of the workpiece support unit on which the extraction fluid guide element can be arranged is preferably aligned at least substantially parallel to the workpiece support surface. By means of the design according to the invention, the extraction fluid guide element can advantageously be protected from damage, such as that resulting from improper placement of a workpiece on the workpiece support surface or from chipping of workpiece parts during machining, etc.

[0012] Furthermore, it is proposed that the extraction fluid guide element has at least one removal inlet opening extending in a plane that runs at least substantially transversely to the workpiece support surface. "Substantially transversely" here refers in particular to an orientation of a direction and / or an axis relative to a reference direction and / or a reference axis, wherein the orientation of the direction and / or axis is at least different from an orientation that is at least substantially parallel to the reference direction and / or the reference axis, and in particular is skew or perpendicular to the reference direction and / or the reference axis. Preferably, the removal inlet opening extends in a plane inclined relative to the workpiece support surface. The workpiece support surface and the plane in which the removal inlet opening extends preferably form an angle of less than 90°.By means of the design according to the invention, an unhindered possibility of movement of the drive unit and thus of the machining tool device relative to the workpiece support unit and relative to the extraction fluid guide unit can advantageously be achieved, whereby a reliable extraction of removed workpiece particles can be ensured.

[0013] Furthermore, it is proposed that the extraction fluid guide unit has at least one extraction port for connection to a fluid flow generation device, which is arranged on the extraction fluid guide element. The fluid flow generation device is preferably designed as an external fluid flow generation device, which is particularly separate from the machine tool. Here, the fluid flow generation device is preferably designed as a vacuum cleaner device. Preferably, the extraction port is provided for connection to an extraction hose of the fluid flow generation device by means of a positive-locking and / or a force-locking connection. Using the design according to the invention, a connection between the extraction fluid guide unit and a fluid flow generation device, in particular an external fluid flow generation device, can be achieved in a structurally simple manner.

[0014] Furthermore, it is proposed that the extraction port be formed integrally with the extraction fluid guide element. However, it is also conceivable that the extraction port be formed separately from the extraction fluid guide element and be fixed to the extraction fluid guide element by means of at least one fastening element of the extraction fluid guide unit, which would appear sensible to a person skilled in the art. The design according to the invention advantageously saves assembly costs, assembly time, and installation space.

[0015] Furthermore, it is proposed that the machine tool has at least one pivot bearing unit for a pivotable mounting of the drive unit, at least relative to the extraction fluid guide unit. Preferably, a pivot axis of the pivot bearing unit runs at least substantially parallel to the linear motion axis of the linear bearing unit. Preferably, the pivot bearing unit is designed to pivot the drive unit from a central position in only one direction by an angle greater than 15°, preferably greater than 30°, and particularly preferably greater than 40°. In a preferred embodiment of the invention, the pivot bearing unit is designed to pivot the drive unit from a central position in only one direction by an angle less than 50°.However, it is also conceivable that the swivel bearing unit is designed to pivot the drive unit from a central position in two opposite directions by an angle greater than 15°, preferably greater than 30°, and particularly preferably greater than 40°. This advantageously allows for high flexibility when machining a workpiece using the machine tool according to the invention, particularly with regard to adjusting the position of the drive unit for machining a workpiece, thus minimizing environmental contamination during workpiece material removal.

[0016] Furthermore, a suction fluid guide element of a suction fluid guide unit of a machine tool according to the invention is proposed. This advantageously allows for the convenient retrofitting of existing machine tools with a suction fluid guide element according to the invention.

[0017] Furthermore, a machine tool system is proposed comprising at least one machine tool according to the invention and at least one machining tool device, which includes at least one cutting strand and at least one guide unit. A "cutting strand" is understood here to mean, in particular, a unit designed to locally disrupt the atomic cohesion of a workpiece to be machined, especially by mechanical separation and / or by mechanical removal of material particles from the workpiece. Preferably, the cutting strand is designed to separate the workpiece into at least two physically separate parts and / or to at least partially separate and / or remove material particles from the workpiece starting from a surface of the workpiece.The cutting strand is particularly preferably moved circumferentially in at least one operating state, especially along a circumference of the guide unit. Here, a "guide unit" is understood to be a unit designed to exert a constraint force on the cutting strand at least along one direction perpendicular to a cutting direction, in order to define a movement of the cutting strand along the cutting direction. Preferably, the guide unit has at least one guide element, in particular a guide groove, through which the cutting strand is guided. Preferably, the cutting strand, viewed in a cutting plane, is guided along the entire circumference of the guide unit by means of the guide element, in particular the guide groove.The term "cutting plane" is used here to define, in particular, a plane in which the cutting strand, in at least one operating state, moves along a circumference of the guide unit in at least two mutually opposite cutting directions relative to the guide unit. Preferably, when machining a workpiece, the cutting plane is oriented at least substantially transversely to the workpiece surface being machined. "At least substantially transversely" here refers specifically to an orientation of a plane and / or a direction relative to another plane and / or another direction, which preferably deviates from a parallel orientation of the plane and / or the direction relative to the other plane and / or the other direction.However, it is also conceivable that the cutting plane during the machining of a workpiece is aligned at least essentially parallel to a workpiece surface to be machined, especially when the cutting strand is designed as an abrasive, etc.

[0018] The term "cutting direction" here refers in particular to the direction along which the cutting strand is moved in at least one operating state as a result of a driving force and / or a driving torque, especially in the guide unit, to create a cutting gap and / or to separate and / or to remove material particles from a workpiece to be machined. Preferably, the cutting strand is moved along the cutting direction relative to the guide unit in one operating state. The cutting strand and the guide unit preferably form a closed system.The term "closed system" is used here to define, in particular, a system comprising at least two components that, through interaction, retain functionality in a disassembled state of the system from a higher-level system, such as a machine tool, and / or that are inextricably connected to one another in a state disassembled from the machine tool, especially from a tool holder of the machine tool. Preferably, the at least two components of the closed system are connected to one another in a way that is at least substantially inseparable for an operator. "At least substantially inseparable" here is understood to mean, in particular, a connection of at least two components that can only be separated with the aid of cutting tools, such as a saw, especially a mechanical saw, etc., and / or chemical separating agents, such as solvents, etc., are separable from one another. By means of the inventive design of the machine tool system, a compact machine tool can advantageously be realized which enables a high removal rate of workpiece particles.

[0019] The machine tool, the extraction fluid guide element, and / or the machine tool system according to the invention are not intended to be limited to the application and embodiment described above. In particular, the machine tool, the extraction fluid guide element, and / or the machine tool system according to the invention may, in order to achieve a functionality described herein, comprise a different number of individual elements, components, and units than that specified herein. drawing

[0020] Further advantages will become apparent from the following description of the drawing. The drawing illustrates an embodiment of the invention. The drawing, the description, and the claims contain numerous features in combination. A person skilled in the art will expediently consider the features individually and combine them into meaningful further combinations.

[0021] They show: Fig. 1 a machine tool according to the invention in a schematic representation, Fig. 2 a detailed view of an extraction fluid guide unit of the machine tool according to the invention in a schematic representation, Fig. 3 a detailed view of an extraction fluid guide element of the extraction fluid guide unit according to the invention in a schematic representation and Fig. 4 A detailed view of a machining tool device of a machine tool system according to the invention in a state disassembled from the machine tool according to the invention in a schematic representation. Description of the exemplary embodiment

[0022] Fig. Figure 1 shows a machine tool 10 designed as a table saw, in particular as an underfloor pull saw. The machine tool 10 has at least one drive unit 12, at least one workpiece support unit 14 for supporting a workpiece during machining, at least one linear bearing unit 16 for at least a translationally movable bearing of the drive unit 12 along a linear axis of motion 22 of the linear bearing unit 16 which runs at least substantially parallel to a workpiece support surface 18 of the workpiece support unit 14, and at least one extraction fluid guide unit 24 for at least guiding a fluid flow for the extraction of workpiece particles. The workpiece support unit 14 is designed as a tool table. Furthermore, the workpiece support unit 14 is arranged on a base unit 54 of the machine tool 10.The machine tool 10 is designed for machining workpieces (not shown in detail here) by being placed on a suitable surface, such as a workbench and / or a production hall floor, etc., using a base contact surface 56 of the machine tool 10. For this purpose, the machine tool 10 includes feet 58, 60, 62, 64, which are arranged on the workpiece support unit 14 and / or on the base unit 54. Thus, the base contact surface 56 is formed by at least one foot surface of one of the feet 58, 60, 62, 64. The feet 58, 60, 62, 64 may be extendable. The workpiece support unit 14 is designed to support a workpiece during machining using a machining tool device 48. Fig. 1 and Fig. 4) provided. Furthermore, the workpiece support unit 14 has at least one stop element (not shown in detail here) against which a workpiece to be machined can be placed for guidance. The stop element can be adjusted and / or movably arranged on the workpiece support surface 18 of the workpiece support unit 14 by means of at least one guide groove 66 of the workpiece support unit 14. In addition, the machine tool 10 includes a tool holder 68 by means of which the machining tool device 48 can be fixed to the machine tool 10 on one side by means of a positive-locking and / or a force-locking connection for machining a workpiece.

[0023] The machining tool device 48 extends through the workpiece support surface 18 of the workpiece support unit 14 in at least one operating state, particularly in a state arranged on the tool holder 68 of the machine tool 10. The workpiece support unit 14 has a tool passage recess 28 in the workpiece support surface 18, through which the machining tool device 48 extends at least substantially perpendicular to the workpiece support surface 18 in a state arranged on the tool holder 68. The drive unit 12 and a gear unit 70 of the machine tool 10 are operatively connected to each other in a manner known to those skilled in the art to generate a drive torque that can be transmitted to the machining tool device 48.The drive unit 12 and / or the gear unit 70 are provided to engage the machining tool device 48 with a cutting strand 50 in a state arranged on the tool holder 68 (. Fig. 4) to be coupled to the machining tool device 48. The gear unit 70 is designed as a bevel gear. The drive unit 12 is designed as an electric motor unit. However, it is also conceivable that the drive unit 12 and / or the gear unit 70 have a different configuration that would appear sensible to a person skilled in the art. Furthermore, it is also conceivable that the drive unit 12 can be coupled directly to the machining tool device 48 without being decoupled from the gear unit 70. The machine tool 10 and the machining tool device 48, which comprises at least the cutting strand 50 and at least one guide unit 52 for guiding the cutting strand 50, together form a machine tool system 46.

[0024] The drive unit 12 is movably mounted by means of the linear bearing unit 16 along the linear motion axis 22 of the linear bearing unit 16, which runs at least substantially parallel to the workpiece support surface 18 of the workpiece support unit 14. The linear motion axis 22 also runs at least substantially parallel to a pivot axis 72 of a pivot bearing unit 44 of the machine tool 10. The machining tool device 48 is thus movably mounted, at least together with the drive unit 12 of the machine tool 10, along the linear motion axis 22, which runs at least substantially parallel to the workpiece support surface 18, relative to the workpiece support unit 14. For this purpose, the linear bearing unit 16 comprises at least one linear guide element 74. The linear guide element 74 is designed as a guide rod.The linear bearing unit 16 further comprises at least one housing unit 76 for receiving and / or supporting the drive unit 12 and the gear unit 70. The housing unit 76 is movably mounted on the linear guide element 74. For this purpose, the housing unit 76 comprises at least two bearing bushing elements 78, 80, through which the linear guide element 74 extends, at least in an assembled state of the machine tool 10. However, it is also conceivable that the housing unit 76 has a different number of bearing bushing elements 78, 80 than two. Thus, at least the drive unit 12, together with the housing unit 76, is movably mounted relative to the workpiece support unit 14 by means of an interaction between the bearing bushing elements 78, 80 and the linear guide element 74. Furthermore, the pivot bearing unit 44 is provided for pivoting the drive unit 12, at least relative to the extraction fluid guide unit 24.

[0025] Furthermore, the drive unit 12 is pivotably mounted about the pivot axis 72 of the pivot bearing unit 44 by means of the pivot bearing unit 44, which runs at least substantially parallel to the workpiece support surface 18 of the workpiece support unit 14. Thus, the pivot bearing unit 44 has at least one pivot axis 72 that runs at least substantially parallel to the workpiece support surface 18 of the workpiece support unit 14. The machining tool device 48 is pivotably mounted about the pivot axis 72, which runs at least substantially parallel to the workpiece support surface 18 of the workpiece support unit 14, in a state arranged on the machine tool 10. During a pivoting movement of the machining tool device 48 relative to the workpiece support unit 14, a cutting plane of the cutting strand 50 is tilted relative to the workpiece support surface 18.The machining tool 48 can be pivoted from a central position in one direction relative to the workpiece support unit 14 by means of the pivot bearing unit 44. For this purpose, the drive unit 12 is pivotably mounted in one direction relative to the workpiece support unit 14 by means of the pivot bearing unit 44, starting from a central position. In the central position of the machining tool 48, the cutting plane of the cutting strand 50 extends at least substantially perpendicular to the workpiece support surface 18. The machining tool 48 can be pivoted from the central position by an angle of less than 50° about the pivot axis 72. For this purpose, the housing unit 76 is pivotably mounted relative to the workpiece support unit 14 by means of the pivot bearing unit 44.However, it is also conceivable that the machining tool device 48 can be pivoted from a central position of the machining tool device 48 by an angle of less than 50° in two opposite directions relative to the workpiece support unit 14.

[0026] When the drive unit 12 moves relative to the workpiece support unit 14, the drive unit 12, and thus the machining tool device 48, moves relative to the extraction fluid guide unit 24 in a state arranged at the tool holder 68. In this movement, the drive unit 12 and the machining tool device 48 are movable relative to an extraction fluid guide element 26 of the extraction fluid guide unit 24. The extraction fluid guide element 26 can be arranged at an edge region of the workpiece support unit 14 that at least defines the tool passage recess 28. Thus, the extraction fluid guide unit 24 comprises at least one extraction fluid guide element 26, which can be fixedly arranged at an edge region of the workpiece support unit 14 that at least defines one tool passage recess 28. The extraction fluid guide element 26 has a minimum distance to the edge area limiting the tool passage recess 28, which is less than 10 mm.In a preferred embodiment, the minimum distance between the extraction fluid guide element 26 and the edge region defining the tool passage recess 28 is 0 mm. Thus, in the preferred embodiment, the extraction fluid guide element 26 can be positioned directly adjacent to the edge region and therefore directly adjacent to the tool passage recess 28 on the workpiece support unit 14. The extraction fluid guide element 26 can be positioned on the side of the workpiece support unit 14 facing away from the workpiece support surface 18. In an alternative embodiment of the machine tool 10, not shown in detail here, the extraction fluid guide element 26 is formed integrally with the side of the workpiece support unit 14 facing away from the workpiece support surface 18.

[0027] To enable the extraction of removed workpiece particles, the extraction fluid guide element 26 has at least one removal inlet opening 40 ( Fig. 2) The material removal inlet opening 40 has a maximum material removal inlet opening extent 30 when viewed along a direction that runs at least substantially parallel to the linear motion axis 22. The tool passage recess 28 also has a maximum longitudinal extent when viewed along a direction that runs at least substantially parallel to the linear motion axis 22. The extraction fluid guide element 26, in particular the material removal inlet opening 40 of the extraction fluid guide element 26, has a maximum material removal inlet opening extent 30 that corresponds to at least 60% of the maximum longitudinal extent of the tool passage recess 28. In a state where the extraction fluid guide element 26 is arranged at the edge region of the workpiece support unit 14 that delimits the tool passage recess 28, it extends along at least substantially the entire maximum longitudinal extent of the tool passage recess 28.Thus, the extraction fluid guide element 26 extends along a direction that is at least substantially parallel to the linear motion axis 22, at least from one end of the tool passage recess 28 to another end of the tool passage recess 28. The material removal inlet opening 40 also extends along at least substantially the entire maximum longitudinal extent of the tool passage recess 28. The material removal inlet opening 40 extends in a plane that is at least substantially transverse to the workpiece support surface 18. The plane in which the material removal inlet opening 40 extends forms an angle with the workpiece support surface 18 that deviates from 90°, in particular from an integer multiple of 90°. Thus, the plane in which the material removal inlet opening 40 extends is inclined relative to the workpiece support surface 18, in particular inclined about the linear motion axis 22.

[0028] Furthermore, the extraction fluid guide unit 24 comprises at least one flow guide element 32, which is arranged in an extraction chamber 38 bounded by the extraction fluid guide element 26 ( Fig. 3) In a state where the extraction fluid guide element 26 is arranged on the workpiece support unit 14, the extraction chamber 38 is bounded by the extraction fluid guide element 26 and a surface of the side of the workpiece support unit 14 facing away from the workpiece support surface 18. The flow guide element 32 is designed as a flow guide rib. However, it is also conceivable that the flow guide element 32 has a different design that would appear advantageous to a person skilled in the art. The flow guide element 32 is formed integrally with the extraction fluid guide element 26. In this case, the flow guide element 32 extends at least substantially transversely to the plane in which the removal inlet opening 40 extends. Thus, the flow guide element 32 runs at least substantially transversely to the removal inlet opening 40. Overall, the extraction fluid guide element 26 has at least three flow guide elements 32, 34, 36.The three flow guide elements 32, 34, 36 have a design that is at least substantially analogous to each other. However, it is also conceivable that the extraction fluid guide unit 24 has a different number of flow guide elements 32, 34, 36 than three. The flow guide elements 32, 34, 36 each extend from an edge region of the extraction fluid guide element 26, which defines the removal inlet opening 40 and runs at least substantially parallel to the linear axis of motion 22, to an extraction connection nozzle 42 of the extraction fluid guide unit 24. The extraction connection nozzle 42 is provided for connection to a fluid flow generation device. For this purpose, the extraction connection nozzle 42 is arranged on the extraction fluid guide element 26. The extraction connection nozzle 42 is formed integrally with the extraction fluid guide element 26.The extraction port 42 is arranged on the extraction fluid guide element 26 in such a way that a user-friendly connection of the extraction port 42 to the fluid flow generation device, in particular to an extraction hose end piece of the fluid flow generation device, is achieved. For this purpose, the extraction port 42 is arranged on a side of the extraction fluid guide element 26 facing away from the material removal inlet opening 40. Thus, the extraction port 42 is arranged on a side of the machine tool 10 that runs at least substantially parallel to the tool passage recess 28.

[0029] The extraction fluid guide element 26 has a triangular shape extending from the tool passage recess 28 towards the extraction port 42, viewed in a plane running at least substantially parallel to the workpiece support surface 18. This allows for the advantageous generation of a fluid-technically beneficial extraction pressure. To generate an extraction fluid flow, the extraction port 42 can be connected to an extraction port of the external fluid flow generation device, which is preferably designed as a vacuum cleaner. The extraction fluid flow is directed to the desired extraction areas of the material removal inlet opening 40 by means of the flow guide elements 32, 34, 36. This advantageously ensures uniform extraction in all areas of the material removal inlet opening 40.

[0030] Fig.Figure 4 shows the machining tool device 48 in a state decoupled from the tool holder 68. The cutting strand 50 and the guide unit 52 together form a closed system. The guide unit 52 is designed as a guide rail. The cutting strand 50 is guided by the guide unit 52 during a rotational movement around the guide unit 52. For this purpose, the guide unit 52 has at least one guide element. The guide element of the guide unit 52 is designed as a guide groove that extends in a cutting plane of the cutting strand 50 along a circumference of the guide unit 52. The cutting strand 50 is guided by means of the edge regions of the guide unit 52 that define the guide groove.However, it is also conceivable that the guide element of the guide unit 52 is designed in a different manner, which would appear sensible to a person skilled in the art, such as a rib-like projection on the guide unit 52 that engages in a recess on the cutting strand 50. Viewed in a plane perpendicular to the cutting plane, the cutting strand 50 is surrounded on three sides by the edge regions that define the guide groove. During operation, the cutting strand 50 is moved circumferentially along its circumference in the guide groove relative to the guide unit 52.

[0031] Furthermore, the machining tool device 48 has a coupling recess 82 into which, in a state of the machining tool device 48 arranged at the tool holder 68, a drive gear of the tool holder 68 and / or the gear unit 70 engages, which can be connected to the cutting line 50 for drive purposes. However, it is also conceivable that the machining tool device 48 has a torque transmission element mounted in the guide unit 52, into which a shaft of the tool holder 68 and / or the gear unit 70 engages, etc. The cutting line 50 comprises a plurality of interconnected cutting element carriers 84, 86, each of which is connected to the other by means of a connecting element (not shown in detail here) of the cutting line 50. Depending on the application, a person skilled in the art will select a suitable number of cutting element carriers 84, 86 for the cutting line 50.The cutting element carriers 84, 86 of the cutting strand 50 each have a recess which, in an assembled state, is located on the side of the respective cutting element carrier 84, 86 facing the drive gear. The drive gear of the tool holder 68 and / or the gear unit 70 engages in the recesses to drive the cutting strand 50 in at least one operating state.

[0032] Furthermore, the cutting strand comprises 50 cutting elements 88, 90. The cutting elements 88, 90 are each formed integrally with one of the cutting element carriers 84, 86. However, it is also conceivable that the cutting elements 88, 90 are formed separately from the cutting element carriers 84, 86. The number of cutting elements 88, 90 depends on the number of cutting element carriers 84, 86. A person skilled in the art will select a suitable number of cutting elements 88, 90 depending on the number of cutting element carriers 84, 86. The cutting elements 88, 90 are designed to enable the separation and / or removal of material particles from a workpiece to be machined. The cutting elements 88, 90 can, for example, be designed as full chisels, semi-chisels or other cutting types that appear useful to a person skilled in the art, which are intended to enable the separation and / or removal of material particles from a workpiece to be machined.The cutting strand 50 is designed as an endless chain. Thus, the cutting strand 50 is designed as a cutting chain. The cutting support elements 84, 86 are designed as chain links, which are connected to each other by means of the connecting elements. However, it is also conceivable that the cutting strand 50, the cutting support elements 84, 86 and / or the connecting elements are designed in a different manner that would appear sensible to a person skilled in the art.

Claims

[1] Machine tool, in particular table saw, with at least one drive unit (12), with at least one workpiece support unit (14) for supporting a workpiece during machining, with at least one linear bearing unit (16) for at least a translationally movable bearing of the drive unit (12) along a linear axis of motion (22) of the linear bearing unit (16) extending at least substantially parallel to a workpiece support surface (18) of the workpiece support unit (14), and with at least one extraction fluid guide unit (24) for at least a guide of a fluid flow for the extraction of removed workpiece particles, wherein the extraction fluid guide unit (24) comprises at least one extraction fluid guide element (26) which can be fixedly arranged on an edge region of the workpiece support unit (14) which defines at least one tool passage recess (28), characterized by, that the extraction fluid guide element (26) has at least one removal inlet opening (40) which extends in a plane that is at least substantially transverse to the workpiece support surface (18). [2] Machine tool according to claim 1, characterized by , that the extraction fluid guide element (26) has a maximum removal inlet opening extent (30) which corresponds to at least 60% of a maximum longitudinal extent of the tool passage recess (28). [3] Machine tool according to one of the preceding claims, characterized by , that the extraction fluid guide element (26) extends in a state arranged at the edge region of the workpiece support unit (14) along at least an essentially entire maximum longitudinal extent of the tool passage recess (28). [4] Machine tool according to one of the preceding claims, characterized by, that the extraction fluid guide unit (24) comprises at least one flow guide element (32, 34, 36) which is arranged in an extraction chamber (38) bounded by the extraction fluid guide element (26). [5] Machine tool according to any one of the preceding claims, characterized by , that the extraction fluid guide element (26) can be arranged on the workpiece support unit (14) on a side of the workpiece support unit (14) facing away from the workpiece support surface (18). [6] Machine tool according to one of the preceding claims, characterized by , that the extraction fluid guide unit (24) has at least one extraction connection nozzle (42) for connection with a fluid flow generating device, which is arranged on the extraction fluid guide element (26). [7] Machine tool according to claim 7, characterized by , that the extraction port (42) is formed in one piece with the extraction fluid guide element (26). [8] Machine tool according to one of the preceding claims, characterized by at least one pivot bearing unit (44) to a pivotable bearing of the drive unit (12) at least relative to the extraction fluid guide unit (24). [9] Extraction fluid guide element (26) of an extraction fluid guide unit (24) of a machine tool according to one of the preceding claims. [10] Machine tool system comprising at least one machine tool according to one of claims 1 to 9 and comprising at least one machining tool device (48) comprising at least one cutting strand (50) and at least one guide unit (52).

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