Hand-held power tool and method for operating hand-held power tool

Abstract

The invention relates to a hand-held power tool, in particular a wood processing tool, comprising a housing, a handle for positioning the power tool relative to a workpiece, a moving unit for receiving a tool for creating a recess, in particular a hole and / or a groove, in the workpiece, a drive unit for driving the moving unit, and a pressure fluid output device for outputting a gaseous pressure fluid to flush recesses created in the workpiece in order to enable and / or assist in conveying workpiece particles out of the created recesses.

Description

Technical Field

[0001] The present invention relates to a handheld power tool, in particular a woodworking tool, comprising a housing, a handle for positioning the power tool relative to a workpiece, a moving unit for receiving a tool for processing the workpiece, and a driving unit arranged in the housing for driving the moving unit. Background Art

[0002] Handheld power tools are known in the prior art. For example, there are handheld power tools in the form of handheld milling machines for milling recesses in the form of elongated holes in workpieces, as is known from DE 10 2011 103 014 A1.

[0003] When machining workpieces, for example when recesses are produced in plate-like workpieces made of wood and / or composite materials, workpiece particles, in particular dust and chips, often accumulate, which can sometimes contaminate the recess, the work area or the environment, thereby also affecting the functionality or operability of the power tool. The suction device for extracting the workpiece particles produced during machining has a limited depth of action, from which the workpiece particles produced in the recess or located there are captured by the suction flow. As a result, material particles can remain in areas not captured by the suction flow, in particular in the recess. There, these workpiece particles can have a negative impact on the machining result by hindering the movement of the tool and reducing the dimensional accuracy of the recess. The obstruction of the tool movement also carries the risk that the driving force of the drive unit will be transmitted to the user of the power tool, causing injury to the user and / or causing the power tool to move only slowly relative to the workpiece, thereby unnecessarily prolonging the machining time.

[0004] Another problem is that workpiece particles remaining in the recess will continue to be cut by the tool, causing increased tool wear. If someone attempts to remove workpiece particles from the machined workpiece, the remaining material particles may also cause injury. Summary of the Invention

[0005] Based on this, the object of the present invention is to provide an improved handheld power tool of the above-mentioned type, which in particular overcomes at least one of the above-mentioned problems.

[0006] According to the invention, this object is achieved by a handheld power tool having the features specified in claim 1. Preferred and advantageous configurations of the power tool according to the invention are specified in the dependent claims.

[0007] The power tool according to the invention comprises a pressure fluid discharge device having an outlet region for discharging gaseous pressure fluid into a working region of the tool during machining of a workpiece by the tool in order to flush the working region with the gaseous pressure fluid.

[0008] The working area is particularly defined as the area in which the tool performs the movements intended for machining the workpiece, the space between the housing of the power tool and the workpiece during machining, and / or the space between the housing of the power tool and its guide unit. Flushing with gaseous pressure fluid allows workpiece particles to be transported at least partially out of the working area and prevents the function of the power tool from being impaired.

[0009] In this context, an outlet region is to be understood to mean, in particular, at least one outlet opening through which the pressurized fluid can be discharged, wherein the outlet opening preferably has an outlet cross section.

[0010] During workpiece processing, the pressure fluid can be output continuously or intermittently, wherein the start or end of the pressure fluid output can be carried out by the user, for example by operating a corresponding switch or opening / closing a valve, and / or by a controller provided in the power tool.

[0011] The pressure fluid delivery device can be integrated into the power tool or designed as a modular, retrofittable system connectable to the power tool, in that the pressure fluid delivery device has, for example, a frame structure connectable to the power tool housing.

[0012] The drive unit is preferably at least one electric motor, which is powered by a power supply in the form of a power supply port or a battery preferably arranged on or in the housing. It is also possible for the drive unit to have a first electric motor (which can also be referred to as a drive motor) and at least one second electric motor (which can also be referred to as a servomotor).

[0013] Preferably, the handheld power tool further comprises a tool, wherein the tool is configured to create a recess, in particular a hole and / or a groove, in a workpiece, and the pressure fluid delivery device is configured to deliver a gaseous pressure fluid into the recess during the creation of the recess, so as to enable and / or assist in the removal of workpiece particles from the recess. To this end, the outlet region is specifically configured such that the outlet opening is oriented toward the workpiece and / or the created recess. The orientation of the outlet opening is, in particular, the direction of a normal vector of the outlet cross section pointing in the direction of the pressure fluid outlet. The created recess has a bottom surface that is substantially parallel to or oriented at an angle to the workpiece surface, and is connected to the workpiece surface by side surfaces, which may also be composed of multiple surfaces. By delivering the pressure fluid into the created recess, workpiece particles located within the recess can be completely removed therefrom, or at least removed from the region of the recess in which the tool performs cutting processing on the workpiece. This reduces the number of material particles remaining in the recess, or nearly completely removes the material particles from the recess. The tool is preferably a milling cutter, in particular a woodworking milling cutter.

[0014] In another preferred embodiment, the power tool includes a suction device to suck the workpiece particles from the working area. The suction device preferably includes at least one suction pipe and a suction opening, which is designed to be connected to a suction device, in particular in the form of a vacuum cleaner. The suction opening is preferably oriented toward the working area so that the workpiece particles located in the working area can be sucked therefrom. Particularly preferably, the suction opening is arranged opposite the outlet area so that the tool and / or the mobile unit is located between the suction opening and the outlet area. By suction, the workpiece particles flushed from the working area or transported from the generated recess can be further transported, so that the number of workpiece particles in the working area or recess and the number of workpiece particles entering the environment can be further reduced.

[0015] The electric tool preferably also includes a guide unit having a stop surface for contacting the workpiece, wherein the pressure fluid output device is preferably arranged on and / or in the guide unit. The guide unit is preferably connected to the housing via a linear guide, which enables the housing to move relative to the guide unit. In this way, when the stop surface contacts the workpiece surface, the position of the tool relative to the workpiece surface can be adjusted. Alternatively, the linear guide can be rigidly connected to the housing. In this case, the position of the tool relative to the workpiece surface can be adjusted by a mobile unit provided for this purpose, in particular in the form of a CNC mobile unit. The mobile unit can be designed separately or integrated into the mobile unit or connected thereto. In addition, the mobile unit enables the tool to be linearly displaced in any spatial direction relative to the workpiece surface. In this context, it can also refer to a three-axis milling cutter, in particular a handheld one. The stop surface is preferably designed as a plurality of parts, and includes at least a first part and a second part, wherein the second part is connected to the guide unit via an angle adjustment mechanism so that the angle between the first part and the second part can be adjusted. The stop surface can also be designed as a platform or plate.

[0016] The stop surface preferably has a recess through which a tool for machining the workpiece passes, wherein the outlet region of the pressure fluid outlet device is arranged in the region of the recess. The recess has an inlet edge facing the movable unit and an outlet edge connected to the inlet edge by a side surface and facing the workpiece, wherein the outlet region is preferably arranged in the region of the inlet edge, i.e., between the housing and the stop surface. The outlet region is thus protected from damage by the stop surface or the guide unit. In order to effectively discharge the pressure fluid into the resulting recess, the outlet opening or the outlet cross section can be oriented toward the outlet edge and / or the resulting recess, and, for example, the pressure fluid can be discharged into the resulting recess tangentially, in particular relative to the side walls of the recess. In other words, the outlet region of the pressure fluid outlet device is designed so that the pressure fluid is discharged parallel to the central axis of the tool and / or the central axis of the receiving portion.

[0017] In a preferred embodiment of the power tool, the outlet region of the pressure fluid delivery device is arranged in a fixed position relative to the guide unit, in or on the guide unit. This means, in particular, that the outlet region remains fixed even during machining of the workpiece, and the distance between the outlet region and the tool does not change. This fixed arrangement simplifies the design of the pressure fluid delivery device.

[0018] The outlet region of the pressure fluid discharge device is preferably arranged so as to be movable relative to the guide unit, in or on the guide unit. This movable arrangement allows the position of the outlet region to be adjusted depending on the tool being used and / or the geometry of the recess. Thus, for example, it is conceivable that the distance between the outlet region and the tool can be set larger for a recess in the form of a groove than for a recess in the form of a hole. The distance of the outlet region perpendicular to the stop surface can also be adjusted, allowing the outlet region to be positioned closer to or further away from the workpiece surface during machining.

[0019] The drive unit is preferably designed to cause the mobile unit to perform a translation movement in order to move the tool relative to the workpiece. In this context, a translation movement is to be understood in particular as a movement relative to the workpiece or a workpiece surface, wherein the movement includes components parallel to and / or perpendicular to the workpiece surface. For example, the mobile unit comprises a spindle that performs a rotational movement and a mobile unit. The tool is received on the spindle and correspondingly performs a rotational movement for machining the workpiece, wherein the spindle is connected to the mobile unit so as to be displaced relative to the workpiece. A drive motor is provided to drive the spindle, and a servo motor is provided to drive the mobile unit. The rotational movement is understood to be the rotation of the tool about its center axis.

[0020] Advantageously, the outlet region is at least temporarily coupled in motion to the displacement unit, so that the outlet region is moved relative to the guide unit by the displacement movement or a portion of the displacement movement. The kinematic coupling between the outlet region and the tool makes it possible to minimize the distance between the outlet region and the tool in order to achieve the most efficient possible discharge of the pressurized fluid into the generated recess without restricting the displacement movement of the displacement unit, in particular the component parallel to the workpiece surface.

[0021] Particularly preferably, the displacement unit comprises a spindle receptacle that performs the displacement movement and a spindle that performs the rotation movement, wherein the spindle is at least partially arranged in the spindle receptacle.

[0022] Furthermore, the pressure fluid output device is preferably kinematically coupled to the spindle support via a coupling unit, in particular a cam disc coupling. During the stroke movement or part-stroke movement, the spindle support comes into contact with a correspondingly designed cam segment of the coupling unit, wherein at least the cam segment connected to the outlet region can be spring-loaded to return the outlet region to its initial position. The initial position can be any position of the outlet region within the recessed area that allows the pressure fluid to be output (in particular, through the recess of the stop surface). The output of the pressure fluid is preferably interrupted if the outlet region is temporarily arranged outside the recessed area due to the movement of the outlet region. The coupling unit also allows kinematic coupling of movement movements with complex path geometries (for example, oscillating movements that oscillate back and forth on a circular path segment).

[0023] In another embodiment of the power tool, the outlet region has an outlet opening leading out of the tool. This outlet opening is preferably arranged on an end face or circumferential side of the tool and is oriented parallel to and / or perpendicular to a channel constructed in the tool and extending in the longitudinal direction of the tool and is fluidically connected thereto. Further preferably, the outlet opening can be arranged in the tool tip segment and / or in an area different from the tool tip segment, in particular in an area adjacent to the tool tip segment and / or on a circumferential side of the tool, in particular in the chip chamber of the tool, wherein the tool tip segment is advantageously made of a material different from the tool base material, in particular made of cemented carbide. By arranging the outlet opening in the tool, the gaseous pressure fluid can be discharged directly into the resulting recess.

[0024] The power tool preferably also includes a pressure fluid source, which is fluidically connected to the pressure fluid output device and is used to supply pressure fluid to the pressure fluid output device. For example, the pressure fluid source can be formed by a first element of a coupling, in particular a quick coupling, which can be connected to a second element of the coupling arranged on the pressure fluid line in order to provide a certain volume flow of pressure fluid from the pressure fluid line of the pressure fluid output device. For example, the pressure fluid source can include an external supply unit, which has a compressor or a pressure fluid container and is fluidically connected to the pressure fluid output device, for example via a pressure fluid line. For this purpose, the pressure fluid output device preferably has a quick connection element. The supply unit can also have a vacuum cleaner that is fluidically connected to the suction device. Advantageously, a pressure fluid volume flow of at least 20 liters / second (preferably at least 35 liters / second) is provided to ensure sufficient rinsing of the working area or to achieve and / or assist the removal of material particles from the resulting recess or working area when the gaseous pressure fluid is output.

[0025] In advantageous designs of the power tool, the pressure fluid source is particularly fixedly arranged in or on the housing or the guide unit. With one of these arrangements, the power tool's mobility is improved, and workpiece processing can be performed independently of an external power supply unit. This can also be referred to as autonomous processing.

[0026] The pressure fluid source preferably comprises a fluid reservoir. The fluid reservoir serves as a pressure fluid reservoir and is capable of providing pressure fluid, for example, when the power tool cannot be supplied via a pressure fluid line (for example due to a temporary failure of the pressure fluid line) or when the power tool is to be used at a location remote from the pressure fluid line. The fluid reservoir can already be filled with pressure fluid or can be filled during operation by introducing a volume flow of a portion of the pressure fluid into the fluid reservoir. The fluid reservoir can also have a valve unit, in particular in the form of a shut-off valve and / or a pressure relief valve, to prevent the pressure fluid from escaping from the fluid reservoir after it has been completely filled, or to prevent it from being filled with pressure fluid again. The pressure can also be released if the pressure of the pressure fluid exceeds a permissible value (for example due to a failure or overheating of the power tool or the fluid reservoir).

[0027] In another design of the power tool, the fluid reservoir is designed as a replaceable cartridge. Using a replaceable cartridge filled with pressurized fluid allows the power tool to be used for extended periods without relying on a pressurized fluid line. This is achieved by replacing the cartridge with a new one after it is empty. The replaceable cartridge also enables the use of various gases as the gaseous pressurized fluid. Thus, for example, shielding gases such as nitrogen or argon can be used if the workpiece material or processing environment so requires.

[0028] Advantageously, the source of pressurized fluid comprises a compressor. The compressor can be arranged in or on the housing, or in or on the guide unit, enabling long-term autonomous workpiece processing. The compressor can be designed as a standalone unit with an independent drive (particularly an electric motor) and an independent power supply. Alternatively, it can be designed as an integrated unit, also driven by the power tool's drive unit.

[0029] In addition, the power tool may also include a barrier device designed to output a gaseous pressure fluid to provide a barrier fluid flow. The barrier device includes an output opening with an output cross-section, and the arrangement of the output opening makes the main direction of the barrier fluid flow substantially parallel to the workpiece surface. The barrier fluid flow can assist in transporting workpiece particles in the working area, thereby preventing the workpiece particles from leaving the working area in an uncontrolled manner. "Uncontrolled" refers in particular to leaving the working area in the direction of the housing or in the direction of the user operating the power tool. The output opening is preferably oriented towards the suction opening to further improve the transport of workpiece particles from the working area.

[0030] The above-mentioned object is also achieved by a method for operating a handheld power tool according to the present invention. The method comprises the following steps: machining a workpiece in a working area with a tool; and discharging gaseous pressure fluid into the working area of ​​the tool during machining of the workpiece with the tool, so as to flush the working area with the gaseous pressure fluid.

[0031] Furthermore, the above-mentioned object is achieved by a tool for machining wood, in particular a woodworking milling cutter, which has a channel extending along a central axis and an outlet opening fluidically connected to the channel for outputting a gaseous pressure fluid into a working area. The tool for machining wood has, in particular, a first tool segment, a second tool segment with a tool tip segment, and a pressure fluid inlet chamber connected to the outlet opening via the channel.

[0032] The tool tip segment forms the end segment of the second tool segment opposite the first tool segment. The second tool segment is designed, at least in part, for cutting wood workpieces. In particular, the second tool segment has cutting edges arranged on the circumference and extending in the longitudinal direction of the central axis. The tool tip segment is designed for cutting wood workpieces and extends from the end side of the tool for wood processing along the central axis of the tool for wood processing. The tool tip segment may have a radially extending end-side cutting edge on its end side.

[0033] The cutting edge extending in the longitudinal direction preferably extends helically, wherein the angle between the cutting edge and the central axis of the tool for machining wood, which is generated by the helical shape of the cutting edge (also referred to as the helix angle), is preferably 10° to 15°, particularly preferably 11° to 12°, wherein the helix angle in the region of the tool tip section is greater than the helix angle in the remaining region of the second tool segment, in particular 0.5° to 1° greater. A correspondingly designed tool for machining wood can also be referred to as a helical milling cutter.

[0034] Advantageously, the tool tip section is made of a material different from the base material of the tool for machining wood, in particular, of cemented carbide. The tool for machining wood preferably has two, more preferably three, cutting edges, which are distributed at even angular intervals around the circumference of the tool for machining wood. The end face can consist of a surface oriented substantially perpendicular to the central axis of the tool for machining wood and / or can consist of a plurality of cutting edges, wherein all or some of the plurality of cutting edges may not be perpendicular to the central axis of the tool for machining wood.

[0035] The outlet opening is arranged on the end side and / or on the circumferential side of the tool for working wood and is oriented parallel and / or perpendicular to the channel provided in the tool for working wood.

[0036] The outlet opening is preferably provided in a region of the second tool segment that is different from the tool tip segment, wherein in particular the tool tip segment is made of a material that is different from the base material of the tool for wood processing, in particular, of cemented carbide. Providing the outlet opening in the tool for wood processing allows the gaseous pressure fluid to be discharged directly into the resulting recess. Furthermore, during manufacturing, the channel can be introduced into the easily processed region of the tool for wood processing, while the highly stressed cutting edge region in the tool tip segment is made of a corrosion-resistant material.

[0037] Alternatively, it can be provided that the channel is arranged in the region of the cutter for processing wood, which is made of hard metal. In particular, the cutter for processing wood can be made completely of hard metal. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The preferred embodiments of the present invention will be described in more detail below with the aid of the accompanying drawings. In the accompanying drawings:

[0039] Figure 1 A rear perspective view of a first design of a handheld power tool according to the present invention;

[0040] Figure 2 A front perspective view of a first design of a handheld power tool according to the present invention;

[0041] Figure 3 A side view of a movable unit of a power tool with a tool, a suction device, and a side sectional view of a first embodiment of a pressure fluid output device;

[0042] Figure 4 A side sectional view of a second design of the mobile unit, the suction device and the pressure fluid output device;

[0043] Figure 5a A side sectional view of a third design of an alternative movement unit (in a first position), a suction device, and a pressure fluid output device to the second embodiment of the handheld power tool;

[0044] Figure 5b for Figure 5a The mobile unit in the second position, the suction device and Figure 5a A side sectional view of the design of the medium pressure fluid output device;

[0045] Figure 5c for Figure 5a The mobile unit, the suction device and the Figure 5a A side sectional view of the design of the medium pressure fluid output device;

[0046] Figure 6a for Figure 5a A side view of the medium pressure fluid output device;

[0047] Figure 6b for Figure 6a a side sectional view of a medium pressure fluid output device;

[0048] Figure 7 A side sectional view of a fourth design of a partial and pressure fluid output device of a third embodiment of a handheld power tool;

[0049] Figure 8a is a side sectional view of a first embodiment of a tool for woodworking with an extended outlet area;

[0050] Figure 8b is a side sectional view of a second embodiment of a tool for woodworking with an extended outlet area;

[0051] Figure 8c is a side sectional view of a third embodiment of a tool for woodworking with an extended outlet area;

[0052] Figure 9a is a side view of a fourth embodiment of a tool for woodworking with an extended outlet area;

[0053] Figure 9b For the Figure 9a A top sectional view of section AA of an embodiment of the tool in FIG. DETAILED DESCRIPTION

[0054] Figure 1 and Figure 2 The power tool 1 comprises a housing 3 , a guide handle 4 and a handle 5 for positioning the power tool 1 relative to a workpiece (not shown), a drive unit 7 and a guide unit 9 arranged in the housing 3 .

[0055] In the region of the handle 5 , a start button 6 is provided on the top side of the housing 3 , with which the power tool 1 can be switched on and off.

[0056] Furthermore, an adjustment element 8 is provided on the top side of the housing 3 in the region between the start button 6 and the guide unit 9. The guide unit 9 has a stop surface 11, via which the guide unit 9 can come into contact with the surface of the workpiece to be machined.

[0057] The stop surface 11 of the illustrated guide unit 9 is designed in multiple sections, including a first section 15 and a second section 17. The second section 17 is connected to the guide unit 9 via an angle adjustment mechanism 19 to adjust the angle between the first section 15 and the second section 17. The guide handle 4 is located at the end of the second section 17 facing away from the first section 15. The figure shows a setting of 180° between the first section 15 and the second section 17. This angle is preferably set within a range of 90° to 180°. To secure the set angle, the angle adjustment mechanism 19 includes a first locking element 20. Adjacent to the lower edge 16 of the first section 15 (i.e., the edge of the first section 15 facing away from the second section 17) is a bottom stop surface 12, which is oriented substantially perpendicular to the first section 15 of the stop surface 11. A vertical guide mechanism 22 allows the distance of the edge 18 of the second section 17 facing the first section 15 in a direction perpendicular to the bottom stop surface 12 (also referred to as the vertical direction). This is particularly advantageous when the angle between the first portion 15 and the second portion 17 is 90° and the second portion 17 is in contact with the surface of the workpiece to be machined (for example, to machine an end face of the workpiece). In order to fix the set distance between the edge 18 and the bottom stop surface 12, a second locking element 24 is provided.

[0058] The guide unit 9 is connected to the housing 3 via a linear guide 13, which enables a movement of the housing 3 relative to the guide unit 9. This movement can also be referred to as a longitudinal movement.

[0059] A tool 21 for producing a recess in a workpiece is inserted through a recess 23 formed in the first portion 15 of the stop surface 11. The distance between the workpiece-facing end of the tool 21 (which can also be referred to as a milling cutter tip, for example) and the first portion 15 of the stop surface 11 can be varied, at least during machining of the workpiece, by moving the tool 21 perpendicularly to the first portion 15 while the stop surface 11 is at least partially in contact with the workpiece. For example, this can be accomplished by moving the housing 3 along the linear guide 13 of the guide unit 9 toward or away from the stop surface 11. The maximum distance between the workpiece-facing end of the tool 21 and the first portion 15 of the stop surface 11 can be specified by a depth adjustment device 14, which limits the maximum displacement along the linear guide 13.

[0060] Furthermore, a pressure fluid outlet 25 and a suction device 27 are provided on the guide unit 9. The pressure fluid outlet 25 with the outlet area 29 is designed to discharge gaseous pressure fluid into the working area of ​​the tool 21 in order to flush the working area with gaseous pressure fluid during workpiece processing or to discharge pressure fluid into the recesses produced. Figure 1As can be seen in the figure, a pressure fluid source 41 is provided at the end of the pressure fluid outlet 25 facing away from the outlet region 29. This pressure fluid source is fluidically connected to the pressure fluid outlet 25 and is designed, for example, in the form of a cylindrical cartridge. The working area is defined as the area in which the tool 21 performs the movements intended for machining the workpiece, the space between the housing 3 of the power tool 1 and the workpiece during machining, and the space between the housing 3 of the power tool 1 and the guide unit 9. Flushing with gaseous pressure fluid removes at least some of the work area from the working area and prevents the function of the power tool 1 from being impaired. The workpiece particles are further transported via the suction device 27. The suction device 27 has a suction connection 43 for connecting the suction device 27 to a suction unit (not shown) and a suction opening 45. In this example, the suction opening 45 is located opposite the outlet region 29. The suction connection 43 is located at the end of the suction device 27 opposite the dust extraction opening 45 and has a circumferentially arranged locking element 44 for connection to a suction unit (not shown). For example, a connection piece of a suction device can then be locked to the suction piece 43 .

[0061] Figure 3 , shows a first embodiment of a pressure fluid discharge device 25, a tool 21, and a suction device 27. An outlet region 29 of the suction device 27 is fixedly arranged on the guide unit 9 in the region of an inlet edge 33 of the recess 23. An outlet opening 35 of the outlet region 29 is oriented toward an outlet edge 39 of the recess 23 and is connected to the inlet edge 33 via a side surface 37. To fluidically connect the pressure fluid discharge device 25 to a pressure fluid source 41, the pressure fluid discharge device 25 has an inlet region 30 at its end opposite the outlet region 29. The inlet region 30 is fluidically connected to the outlet region 29 via a pressure fluid channel 32. To discharge or further transport workpiece particles captured or stirred up by the pressure fluid flow, a suction opening 45 of the suction device 27 is oriented toward the working area, and therefore, for example, perpendicularly to the central axis 26 of the tool 21. This orientation is understood to be the direction of the normal vector of the suction opening cross section defined by the suction opening 45.

[0062] The tool 21 is received in the mobile unit 31, wherein the mobile unit 31 is at least rotationally driven by the drive unit 7. In order to supply power to the motor of the drive unit 7, a power supply port 47 is arranged at the rear end of the housing 3 (i.e. the end opposite to the guide unit 9) (see Figure 1 ).

[0063] Figure 4The design of the pressure fluid output device 25 shown in the figure—its outlet region 29 is oriented as described above and further comprises a blocking device 49. The blocking device 49 is designed for outputting a gaseous pressure fluid to provide a blocking fluid flow and comprises an output opening 51 facing in the direction of the suction opening 45, wherein the direction is to be understood as the direction of the normal vector of the output opening cross section defined by the output opening 51. In the embodiment shown, the blocking device 49 is connected via a further inlet region 50 to a pressure fluid source 41 for supplying pressure fluid to the blocking device 49, wherein the output opening 51 and the further inlet region are fluidically connected via a blocking fluid channel 52. For example, the blocking device 49 is integrated in the pressure fluid output device 25, wherein the inlet region 30 and the further inlet region 50 open at a common outer surface 28 of the pressure fluid output device 25, and the pressure fluid channel 32 and the blocking fluid channel 52 extend essentially parallel to each other.

[0064] Figure 5a 、 5b 5c show an alternative displacement unit 31 of the second embodiment of the electric tool 1 and a third design of the pressure fluid output device 25, wherein the third design of the pressure fluid output device 25 is Figure 6a and 6b . The pressure fluid output device 25 has an outlet region 29 and an inlet region 30, which are fluidically connected via a pressure fluid channel 32. In this design, the inlet region 30 is designed as a plug connector that can be connected to a pressure fluid hose (not shown) to connect the pressure fluid output device 25 to an external pressure fluid source (not shown) (for example, in the form of a compressor) for supplying pressure fluid to the pressure fluid output device 25. The design of the suction device 27 is as described above.

[0065] In this embodiment of the power tool 1, the drive unit 7 is designed to cause the moving unit 31 to perform a moving motion so as to move the tool 21 relative to the workpiece. The moving unit 31 includes a spindle seat 53 that performs the moving motion and a spindle 55 that is partially received in the spindle seat 53 and performs a rotational motion. In this embodiment, the moving motion occurs periodically. Figure 5a The first position of the mobile unit 31 is shown and Figure 5c The third position of the mobile unit 31 is shown, wherein the mobile unit 31 passes through Figure 5b The second position of the displacement unit 31 is shown. A displacement movement is a movement relative to the workpiece or the workpiece surface, wherein the movement comprises components parallel and / or perpendicular to the workpiece surface, wherein the amplitude of the movement parallel to the workpiece surface can be varied by the adjusting element 8 .

[0066] In order to minimize the distance between the outlet area 29 and the tool 21 oriented parallel to the workpiece surface and to achieve the most effective possible output of the pressurized fluid into the produced recess, the outlet area 29 is coupled to the movement of the displacement unit 31 so that the outlet area 29 performs an outlet area movement relative to the guide unit 9 by a displacement movement.

[0067] For the kinematic coupling between the outlet region 29 and the displacement unit 31, the pressure fluid output device 25 has a coupling unit 57 having a curved section 59, wherein the spindle seat 53 is in contact with the curved section 59 of the coupling unit 57. The curved section 59 is designed to be flat, for example, but can have another shape that is consistent with the displacement movement of the displacement unit 31.

[0068] The coupling unit 57 shown is designed in multiple parts, including: a bearing element 61, which is fixedly arranged in or on the guide unit 9; and a displacement element 63, which is connected to the bearing element 61 via guide rods 65, which enable the displacement element 63 to be displaced relative to the bearing element 61. The guide rods 65 are arranged in bearing sleeves 66 in the displacement element 63. In order for the outlet area 29 to perform an outlet area movement relative to the guide unit 9 by a displacement movement, the outlet area 29 is firmly connected to the displacement element 63. Springs 67 are provided between the bearing element 61 and the displacement element 63, which springs 67 can reset the displacement element 63 to its initial position. If the spindle seat 53 is displaced in the direction of the bearing element 61 until it reaches Figure 5a The first position shown in FIG. 1 is the position in which the displacement element 63 moves along the guide rod 65 toward the bearing element 61. If the spindle seat 53 moves toward the second position ( Figure 5b ) or third position ( Figure 5c ) performs a reverse movement, the displacement element 63 will move away from the bearing element 61 along the guide rod 65 through the spring 67.

[0069] For example, limit switches (not shown) are present in the coupling unit 57, which are connected to a controller (not shown) provided in the power tool 1 for signaling purposes. Figure 5a ), that is, when the limit switch responds, the controller can cause the output pressure fluid to be terminated. When the spindle seat 53 leaves the first position again, the output pressure fluid is restarted, so that the limit switch no longer responds.

[0070] exist Figure 7In the third embodiment of the power tool 1, shown partially, the outlet region 29 has an outlet opening 35 leading from the tool 21, so that the pressurized fluid can be discharged from the tool 21 directly into the recess produced in the workpiece to be machined. To connect the outlet opening 35 to the pressurized fluid source 41 or to a pressurized fluid line 69 connected to the pressurized fluid source 41, channels 71, 73 are formed in the spindle 55 and the tool 21, respectively, wherein the channels 71, 73 extend along the axial extent of the spindle 55 or the tool 21.

[0071] exist Figure 8a 、 8b 8c and 8c show various embodiments of a tool 21 designed as a woodworking tool (more precisely a woodworking milling cutter) in cross-section for use with Figure 7 The embodiment of the woodworking tool 1 shown in FIG. The embodiment of the woodworking tool shown in FIG. has two cutting edges 70 with corresponding chip cavities 79, wherein Figure 8a 、 8b In 8 and 8c only one cutting edge 70 is visible.

[0072] Figure 8a The tool 21 shown has a first tool segment 74 of essentially cylindrical design and a second tool segment 75 of smaller diameter, which adjoins the first tool segment 74 and is, for example, partially cylindrical in design. A tool tip segment 76 is formed on the region of the second tool segment 75 opposite the first tool segment 74 and extends to an end face 77 of the tool 21. The channel 73 of the tool 21 connects a pressure fluid inlet chamber 78 of the tool 21 to the outlet opening 35. To connect the tool 21 to the spindle 55, the pressure fluid inlet chamber 78 has, for example, an internal thread on its inner side, wherein the spindle 55 has an external thread corresponding to this internal thread.

[0073] exist Figure 8a In the embodiment shown, the outlet opening 35 is arranged on the end face 77 of the tool 21. The channel 73 then extends from the pressure fluid inlet chamber 78 to the outlet opening 35 along a straight line.

[0074] exist Figure 8b In the illustrated embodiment of the tool 21, the outlet opening 35 opens outwardly from the tool 21 on the circumference. The channel 73 includes a first channel section 80 and a second channel section 81. The first channel section 80 is arranged parallel to the central axis 26 of the tool 21, and the second channel section 81 is perpendicular to the first channel section 80. The second channel section fluidically connects the first channel section 80 to the outlet opening 35. In this embodiment, the pressurized fluid is delivered perpendicularly to the central axis 26 of the tool 21 into the chip chambers 79 of the tool 21. In this embodiment, an outlet opening 35 is provided in each chip chamber 79.

[0075] Figure 8c Another embodiment of a tool 21 is shown, in which the tool 21 has outlet openings 35 arranged in chip pockets 79 of the tool 21. In this embodiment, an outlet opening 35 projects into each chip pocket 79, wherein the outlet openings 35 are connected to one another and to the first channel portion 80 via a channel portion 82. The outlet openings 35 are oriented such that the respective normal vector of the outlet opening cross section defined by the respective outlet 35 has a component perpendicular to the center axis 26 of the tool 21 and a component parallel to the center axis 26 of the tool 21.

[0076] Figure 9a and 9b Another embodiment of the tool 21 is shown. Figure 7 The embodiment of the power tool 1 shown is used together with the embodiment of the power tool 1 shown. In this embodiment, two cutting edges 70 are constructed, which extend over most of the area of ​​the second tool segment 75. In this embodiment, the first tool segment 74 and the second tool segment 75 are made of a metal base material, while the tool tip segment 76 is made of a hard metal. The outlet openings 35 opened in the area of ​​the second tool segment 75 formed by the base material respectively lead into one of the chip cavities 79. In the shown design of the tool 21, the helix angle α formed between the cutting edge 70 and the center axis 26 remains constant over the entire extension range of the cutting edge 70, for example 11.5°. The chip cavity 79 is formed on the second tool segment 75, corresponds to the cutting edge 70, and can efficiently discharge chips from the workpiece to be machined.

Claims

1. A handheld electric tool (1), in particular a woodworking tool, comprising: - housing (3); - a handle (5) for positioning the power tool relative to a workpiece; - a mobile unit (31) for receiving a tool (21) for machining a workpiece; - a driving unit (7) disposed in the housing (3) for driving the moving unit (31); and A pressure fluid discharge device (25) having an outlet region (29) for discharging gaseous pressure fluid into a working region of the tool (21) during machining of the workpiece by means of the tool (21) in order to flush the working region with the gaseous pressure fluid.

2. The handheld power tool according to claim 1, further comprising: A tool (21), wherein the tool (21) is used to produce a recess, in particular a hole and / or a groove, on the workpiece; and the pressure fluid output device (25) is used to output the gaseous pressure fluid into the produced recess when the recess is produced, so as to realize and / or assist in transporting workpiece particles out of the produced recess.

3. The electric tool according to claim 1 or 2, further comprising: A suction device (27) is provided for sucking workpiece particles from the working area.

4. The electric tool according to claim 1 or 2, further comprising: A guide unit (9) having a stop surface (11) for contacting the workpiece, wherein the pressure fluid output device (25) is arranged on the guide unit (9) and / or in the guide unit (9).

5. The electric tool according to claim 4, wherein: The stop surface (11) has a recess (23) through which the tool (21) for machining the workpiece passes, wherein an outlet region (29) of the pressure fluid output device (25) is arranged in the region of the recess (23).

6. The electric power tool according to claim 5, wherein: An outlet region (29) of the pressure fluid outlet device (25) is arranged in or on the guide unit (9) in a fixed position relative to the guide unit.

7. The electric tool according to claim 5, wherein: An outlet region (29) of the pressure fluid outlet device (25) is arranged in or on the guide unit (9) so as to be displaceable relative to the guide unit.

8. The electric power tool according to claim 7, wherein: The drive unit (7) is designed to cause the moving unit (31) to perform a moving motion so as to move the tool (21) relative to the workpiece.

9. The electric tool according to claim 7 or 8, wherein: The outlet region (29) is at least temporarily coupled in motion to the displacement unit (31), so that the outlet region (29) performs an outlet region movement relative to the guide unit by the displacement movement.

10. A power tool according to any one of the preceding claims, wherein The moving unit (31) includes a spindle seat (53) for performing the moving movement and a spindle (55) for performing the rotating movement, wherein the spindle (55) is at least partially arranged in the spindle seat (53).

11. The electric tool according to any one of claims 7 to 10, wherein: The pressure fluid output device (25) is coupled in motion to the spindle seat (53) via a coupling unit (57), in particular a cam coupling.

12. The electric tool according to any one of claims 1 to 3, wherein: The outlet region (29) has an outlet opening (35) which leads out of the tool (21), in particular out of a tool tip section (76).

13. The electric power tool according to claim 12, wherein: The tool (21) is a tool for processing wood, in particular a woodworking milling cutter.

14. The power tool according to any one of the preceding claims, further comprising: A pressure fluid source (41) is fluidically connected to the pressure fluid output device (25) and is used to provide the pressure fluid to the pressure fluid output device.

15. The electric power tool according to claim 14, wherein The pressure fluid source (41) is arranged in particular in a stationary manner in or on the housing (3) or the guide unit (9).

16. The electric tool according to claim 14 or 15, wherein: The source of pressurized fluid (41) includes a fluid reservoir.

17. The electric power tool according to claim 16, wherein: The fluid reservoir is designed as a replaceable cartridge.

18. The electric tool according to any one of claims 14 to 17, wherein: The source of pressurized fluid (41) comprises a compressor.

19. A power tool according to any one of the preceding claims, wherein The outlet region (29) is arranged such that the outlet opening (35) is oriented in the direction of the workpiece and / or the produced recess.

20. A method for operating a handheld power tool (1) according to any one of the preceding claims, comprising the following steps: - machining a workpiece in the working area with the aid of a tool (21); During machining of the workpiece by means of the tool (21), gaseous pressure fluid is discharged into the working area in order to flush the working area with the gaseous pressure fluid.

21. A tool (21) for machining wood, in particular a woodworking milling cutter, comprising a channel (73) extending along a central axis (26) and an outlet opening (35) fluidically connected to the channel (73) for outputting a gaseous pressure fluid into a working area.

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