Machine tool for machining a workpiece

Abstract

Machine tool (1), in particular a router or drilling machine, for machining a workpiece with a drive unit (2) comprising: a housing (3), a tool shaft (5) rotatable about a rotation axis (4) and a locking unit (6) for rotationally locking the tool shaft (5), which has an actuating element (7), which, when used as intended, can be moved by a user from an initial position to an operating position, characterized by that the drive unit (2) comprises a locking unit (8) for locking the actuating element (7) in the actuating position, which has a locking area (9) and a corresponding locking element (10), wherein the locking element (10) is movable, during intended use, from an unlocked position into a locked position, in which the locking element (10) is operatively connected to the locking region (9) in such a way that the actuating element (7) is locked in its actuating position.

Description

[0001] The present invention relates to a machine tool, in particular a router or drilling machine, for machining a workpiece with a drive unit. The drive unit comprises a housing, a tool shaft rotatable about a rotational axis, and a locking unit for rotationally locking the tool shaft. The locking unit has an actuating element that, during intended use, can be moved by a user from an initial position to an actuating position.

[0002] DE 10 2006 061 242 A1 describes a typical router design. To change the tool on a router, the spindle or tool shaft must be secured against rotation. To do this, the user must secure the spindle or tool shaft with one hand and replace the tool, such as a milling head, with the other hand. This is cumbersome and not user-friendly.

[0003] The object of the present invention is therefore to solve the problems known from the prior art. In particular, the user-friendliness of a tool change on a machine tool is to be increased and / or the risk of injury reduced.

[0004] The problem is solved by a machine tool having the features of the independent claim. Advantageous or preferred embodiments are each the subject of a corresponding dependent claim.

[0005] The invention relates to a machine tool, in particular a router or drilling machine, for machining a workpiece with a drive unit. The drive unit comprises a housing. Furthermore, the drive unit comprises a tool shaft rotatable about a rotational axis. In addition, the drive unit has a locking unit for rotationally locking the tool shaft. The locking unit has an actuating element. This can be moved by a user from an initial position into an actuating position during intended use. By moving the actuating element into the actuating position, the tool shaft is rotationally locked by the locking unit. The actuating element can be designed, for example, as a button that can be actuated by the user. In addition, the drive unit comprises a locking unit for locking the actuating element in the actuating position.This has a locking area and a corresponding locking element. During intended use, the locking element can be moved from an unlocked position to a locked position. In the locked position, the locking element is operatively connected to the locking area in such a way that the actuating element is locked in its actuating position. This eliminates the need for the user to continuously actuate the actuating element in order to securely lock the tool shaft against rotation. This increases user-friendliness. Furthermore, the risk of accidents is minimized, as the user has both hands free once the tool shaft is securely locked against rotation.

[0006] It is advantageous if the drive unit includes a drive motor for driving the tool shaft. The drive motor is preferably located in the housing. This allows the tool shaft to be driven effectively.

[0007] It is also advantageous if the machine tool includes a positioning unit for positioning the machine tool relative to the workpiece. This increases handling and user-friendliness.

[0008] It is also advantageous if the positioning unit includes a support plate for the workpiece. This increases user-friendliness and also increases the precision of machining the workpiece.

[0009] It is advantageous if the support plate includes a through-hole. It is also advantageous if, during intended use, a tool, in particular a drill or milling head, can be inserted through the through-hole. This further increases user-friendliness and precision during workpiece machining.

[0010] It is advantageous if the drive unit and the positioning unit are movable relative to one another, preferably between a first end position and a second end position. In particular, it is advantageous if the drive unit and the positioning unit are movable translationally relative to one another, preferably into the first and second end positions. In the first end position, the drive unit and the positioning unit are at a maximum distance from one another. In the second end position, they are at a maximum approach to one another. A further advantage arises if the drive unit and the positioning unit are continuously movable between the first end position and the second end position. This ensures that the drive unit can be brought closer to the workpiece in a targeted and controlled manner.

[0011] It is also advantageous if the locking unit is designed such that it can lock the actuating element in its actuating position when the drive unit and the positioning unit are located outside the second end position, i.e., when they are not in the second end position. Additionally or alternatively, it is advantageous if the locking unit is designed such that it can lock the actuating element in its actuating position when the drive unit and the positioning unit are in the first end position.

[0012] It also offers advantages if the machine tool includes a guide unit for guiding the translational relative movement between the drive unit and the positioning unit. This can improve the targeted and controlled approach of the drive unit to the workpiece.

[0013] It is also advantageous if the guide unit is designed in such a way that it applies a spring force to the drive unit and the positioning unit toward the first end position. This prevents the drive unit from approaching the workpiece in an uncontrolled manner, which could cause damage to the machine tool.

[0014] It is advantageous if the guide unit comprises at least one guide support that connects the drive unit and the positioning unit to one another, particularly in a translational manner, so that they can move relatively. In particular, it is advantageous if the guide unit comprises a first guide support and a second guide support. This contributes to improved guidance and stability of the machine tool. This allows for more uniform machining of the workpiece and improved work quality.

[0015] It is also advantageous if the at least one guide support is adjustable in length. In particular, it is advantageous if it is designed to be telescopically adjustable in length. This allows for flexible adjustment of the relative movement between the drive unit and the positioning unit.

[0016] It is also advantageous if the guide unit comprises a locking mechanism for locking a relative position between the drive unit and the positioning unit. In particular, it is advantageous if this locking mechanism can lock at least the second end position.

[0017] It is advantageous if the actuating element can be moved from the starting position into the actuating position to activate the locking unit. In particular, it is advantageous if the actuating element can be moved from the starting position, via an intermediate position, into the actuating position. The intermediate position can be spatially located between the starting position and the actuating position. Alternatively, it is also conceivable for the actuating position to be spatially located between the starting position and the intermediate position. In this case, it is advantageous if “overpressing” the actuating element represents the intermediate position. In addition or alternatively, it is advantageous if the actuating element can be moved from the actuating position into the starting position to deactivate the locking unit.A further advantage arises if the actuating element can be moved from the actuating position via the intermediate position to the starting position.

[0018] It is also advantageous if the actuating element comprises a first part and a second part. This allows the parts to be individually adapted to their respective load situations, particularly with regard to their material properties, which in turn can reduce material costs. A further advantage is achieved if these parts are connected in a form-fitting manner. Additionally or alternatively, it is advantageous if they are connected in a force-fitting manner. In particular, it is advantageous if the first part and the second part are permanently connected to one another. This can increase the stability and longevity of the actuating element.

[0019] It is also advantageous if the first part and the second part are made of different materials. The first part is preferably made of plastic to ensure cost-effective production. Furthermore, it is advantageous if the second part is made of metal to ensure greater stability and durability.

[0020] It is also advantageous if the locking unit includes a locking element for locking the tool shaft in a rotationally fixed manner.

[0021] This element is movable between an unlocked position and a locked position. Preferably, the locking element is movable in translation.

[0022] It is advantageous if the locking unit includes a locking spring. This is preferably designed and / or arranged in such a way that it is compressed when the actuating element is moved toward the actuating position. As a result, the locking element is spring-loaded and presses toward the tool shaft.

[0023] It is also advantageous if the locking unit includes a return spring. This is preferably designed and / or arranged in such a way that it pushes the actuating element toward the starting position under spring pressure. This increases user-friendliness, as the user does not have to manually move the actuating element to the starting position.

[0024] It is also advantageous if the locking unit includes a coupling element. The coupling element can, for example, be designed as a sleeve.

[0025] It is also advantageous if the coupling element couples the actuating element and the locking element to one another in a relatively movable manner such that the actuating element and the locking element are decoupled from one another when the actuating element moves into the actuating position. Additionally or alternatively, it is advantageous if the actuating element and the locking element are coupled to one another by means of the coupling element when the actuating element moves back into the unlocked position and / or the locking element is in the locked position.

[0026] It is also advantageous if the coupling element for the actuating element comprises a first driving element. Additionally or alternatively, it is advantageous if the coupling element for the locking element comprises a second driving element.

[0027] It is also advantageous if the actuating element is translationally movable along a locking axis. Additionally or alternatively, it is advantageous if the locking element is translationally movable along the locking axis. Furthermore, it is additionally or alternatively advantageous if the coupling element is translationally movable along the locking axis. In particular, it is advantageous if the actuating element, locking element, and coupling element are jointly translationally movable along the locking axis. In particular, by moving them together along the locking axis, wear on the individual components can be minimized. Furthermore, the structural volume of the locking unit can be reduced.

[0028] It is also advantageous if the actuating element comprises a first guide section for guiding the coupling element, in particular the first driver element, during a translational relative movement between the actuating element and the coupling element. This ensures reliable guidance of the coupling element.

[0029] It is advantageous if the actuating element comprises a first driving stop, which preferably corresponds to the first driving element of the coupling element. Additionally or alternatively, it is advantageous if the first driving stop drives the coupling element when the actuating element is moved back to the starting position.

[0030] It is also advantageous if the actuating element comprises a first return spring contact surface, which the return spring preferably rests against. This ensures that the return spring cannot slip and / or be compressed when the actuating element is actuated.

[0031] It is advantageous if the actuating element comprises a first locking spring contact surface, against which the locking spring preferably rests. This ensures that the locking spring cannot slip and / or be compressed when the actuating element is actuated.

[0032] It is also advantageous if the tool shaft includes a tool chuck for releasably securing the tool. The tool can, as already mentioned above, be, for example, a milling cutter and / or drill.

[0033] It is also advantageous if the tool shaft includes a locking recess for receiving the locking element. The locking recess preferably extends over a, preferably limited, angular sector, in particular of less than 360°. This allows a rotationally fixed connection to be formed with the positively engaging locking element.

[0034] It is also advantageous if the locking element comprises a locking region. The locking region is preferably located at a free end of the locking element. In particular, it is advantageous if, in the locking position, the locking element engages positively with the tool shaft, in particular with the locking recess.

[0035] Furthermore, it is advantageous if the tool shaft can be moved, in particular rotationally, from a neutral position into a locking position. In particular, it is advantageous if, in the locking position, the locking recess is aligned with the locking element in such a way that the locking region of the locking element can penetrate into the locking recess of the tool shaft.

[0036] It is also advantageous if the locking element comprises a second guide section for guiding the coupling element, in particular the second driving element, during a translational relative movement between the locking element and the coupling element.

[0037] It is also advantageous if the locking element comprises a second driving stop. This corresponds to the second driving element of the coupling element. Additionally or alternatively, the second driving stop carries the locking element when the actuating element is moved back to its original position.

[0038] It is also advantageous if the locking element comprises a second locking spring contact surface. It is particularly advantageous if the locking spring rests against this second contact surface.

[0039] It is also advantageous if the first driving element of the coupling element is guided translationally in the first guide section of the actuating element. Additionally or alternatively, it is advantageous if the second driving element of the coupling element is guided translationally in the second guide section of the locking element.

[0040] It is also advantageous if the housing includes a first housing recess for accommodating the actuating element. It is also advantageous if the first housing recess can guide the actuating element. If the first housing recess can additionally guide the actuating element, more precise and controlled actuation is enabled, thereby reducing unwanted movements or operating errors.

[0041] It is advantageous if the housing comprises a second housing recess for receiving the locking element. Additionally or alternatively, it is advantageous if the second housing recess can guide the locking element.

[0042] It is also advantageous if the first housing recess and the second housing recess are connected to each other and / or form a common recess.

[0043] It is also advantageous if the housing includes a second return spring contact surface. It is particularly advantageous if the return spring rests against this surface. This could minimize unwanted movement of the return spring.

[0044] It is advantageous if the locking element is arranged on the actuating element. It is also advantageous if the locking region is arranged on the housing. Alternatively, it is advantageous if the locking element is arranged on the housing and the locking region is arranged on the actuating element.

[0045] Furthermore, it is advantageous if the locking element includes an engagement element for engaging the locking area. It is particularly advantageous if this element can engage positively and / or non-positively. This ensures secure and reliable fixation of the moving components. A positive engagement ensures precise positioning, which prevents unintentional displacement and thus increases the precision of the work.

[0046] It is also advantageous if the engagement element includes a sliding surface that allows the locking element to slide on a corresponding surface. The sliding surface is preferably convex. This ensures loss-free sliding.

[0047] It is advantageous if the engagement element comprises an extension that preferably protrudes in the transverse direction of the locking element. This allows a positive connection to be formed.

[0048] It is also advantageous if the locking element can be moved translationally along a locking axis. Alternatively, it can be moved rotationally around a rotation axis.

[0049] It is advantageous if the locking axis or rotation axis is aligned obliquely, in particular vertically, to the locking axis.

[0050] It is also advantageous if the locking element comprises a bearing region. The locking element is preferably mounted in the housing, particularly in a translational or rotational manner, within this bearing region. Alternatively, the bearing region can be arranged in the actuating element, in which the locking element is then mounted in a translational or rotational manner.

[0051] It is also advantageous if the locking unit comprises a spring element. It is advantageous if the spring element is arranged and / or designed such that it applies a spring force to the locking element in the unlocked position in the direction of the locked position. Alternatively, the spring element can be arranged and / or designed such that it applies the spring force to the locking element in the locked position in the direction of the unlocked position. A further advantageous alternative is if the spring element applies the spring force to the locking element as soon as the locking element is moved out of the unlocked position.

[0052] It is also advantageous if the locking element includes a spring receiving area. The spring element rests against the locking element in this area. Additionally or alternatively, the spring element is connected to the spring receiving area, particularly in a tensile and / or compressive direction of the spring element. This can prevent unwanted displacement of the spring element.

[0053] It is also advantageous if the locking area is a locking recess. It is also advantageous if the locking recess is designed to be free of play relative to the engagement element of the locking element. Alternatively, it is advantageous if the locking recess is designed to correspond to the engagement element of the locking element in such a way that the actuating element is immovably locked in the actuating position when the locking element is in the locked position.

[0054] It is advantageous if the locking recess is configured with play and / or corresponds to the engagement element of the locking element in such a way that the actuating element can be moved from the actuating position into the intermediate position when the locking element is in the locked position. In particular, it is advantageous if the locking element can be pushed over from the actuating position into the intermediate position.

[0055] It is also advantageous if the locking area includes an undercut. This is preferably designed to correspond to the extension of the engagement element. This enables a particularly stable and secure locking of the locking element, as it prevents accidental release of the locking mechanism due to axial or lateral forces.

[0056] It is advantageous if the locking area has a V-shape. This ensures precise and self-centering guidance of the locking element.

[0057] It is also advantageous if the locking unit comprises a first guide surface. Preferably, this guide surface can be used to guide the engagement element of the locking element toward or into the locking region when the actuating element is moved in a first direction. The first direction is the direction in which the actuating element moves into the housing.

[0058] It is also advantageous if the first feed surface is aligned at an angle to the locking axis. This allows the locking element to move simultaneously when the actuating element is moved.

[0059] It is also advantageous if the locking unit comprises a second feed surface. Preferably, this can guide the engagement element of the locking element into the locking region when the actuating element is moved in a second direction opposite to the first direction. In particular, it is advantageous if the locking element can be guided from the intermediate position into the locking region by means of the second feed surface. It is advantageous if the second feed surface is aligned parallel to the locking axis.

[0060] It is advantageous if the locking unit comprises a first return surface. By means of this, the engagement element of the locking element can be guided out of the locking region, particularly when the actuating element is moved in the first direction.

[0061] It is also advantageous if the locking unit comprises a second return surface. This allows the engagement element of the locking element to be guided away from the locking area, particularly when the actuating element is moved in the second direction.

[0062] Furthermore, it is advantageous if the second return surface adjoins the first return surface. Additionally or alternatively, the second return surface can be arranged directly adjacent to the first return surface.

[0063] It is also advantageous if the first return surface is aligned at an angle relative to the locking axis. Additionally or alternatively, the second return surface can be aligned at an angle relative to the locking axis.

[0064] It is also advantageous if the actuating element comprises a cavity. In particular, it is advantageous if this cavity has a cavity opening.

[0065] It is also advantageous if the actuating element comprises at least one third part. This is preferably arranged in the cavity. Furthermore, it is advantageous if the first feed surface is formed on the at least one third part. Additionally or alternatively, the second feed surface, the locking recess, the first return surface, and / or the second return surface can be formed on the at least one third part.

[0066] It is also advantageous if the locking element includes an operating area. In particular, it is advantageous if this is designed for the user to manually grasp and move the locking element. It is also advantageous if the operating area is located outside the housing. This makes it easy for the user to operate.

[0067] Further advantages of the invention are described in the following exemplary embodiments. They show, schematically: Fig. 1 a perspective view of a machine tool, in particular a router, Fig. 2 to 4 a sectional side view of a drive unit according to a first embodiment in different states, Fig. 5 a sectional side view of a drive unit according to a second embodiment, Fig. 6 a sectional side view of a drive unit according to a third embodiment and Fig. 7 to 8 a sectional side view of a drive unit according to a fourth embodiment in different states.

[0068] Fig. 1 shows a perspective view of a machine tool 1 for machining a workpiece (not shown here). In the present example, the machine tool 1 is designed as a router. However, the machine tool 1 can also be designed, for example, as a drilling machine (not shown here). The machine tool 1 comprises a drive unit 2. This has a housing 3. A drive motor (not shown) is arranged in the housing 3. Furthermore, the drive unit 2 comprises a tool shaft 5, which is rotatable about a rotational axis 4. This can be driven by the drive motor. The tool shaft 5 comprises a tool chuck 31. This is arranged at the free end of the tool shaft 5. The tool chuck 31 serves to releasably fasten a tool (not shown here), for example a milling cutter or drill. In the Fig. For the router shown in Figure 1, a milling cutter would be a suitable tool for detachable fastening in the tool chuck 31.

[0069] Furthermore, the drive unit 2 has a locking unit 6 for rotationally locking the tool shaft 5. In the present example, this is positioned in the area of ​​the tool shaft 5. The locking unit 6 comprises an actuating element 7. In the Fig. In the perspective view shown in Figure 1, only the actuating element 7 of the locking unit 6 is visible. During normal use, this element can be moved by a user from an initial position to an actuating position.

[0070] Furthermore, the drive unit 2 comprises a Fig. 1 not visible locking unit 8 for locking the actuating element 7 in the actuating position, which can be designed differently and is described below in the description of the Fig. 2 to 8. A user can move the actuating element 7 from the starting position to the actuating position, thereby locking the tool shaft 5 in a rotationally fixed manner. The locking unit 8 locks the actuating element 7 in the actuating position. This eliminates the need for the user to hold it down continuously. This has the advantage that the user has both hands free to attach, release, or replace the tool in the tool chuck 31. This facilitates handling and reduces the risk of injury.

[0071] The machine tool 1 comprises according to Fig. 1 a positioning unit 11 for positioning the machine tool 1 relative to the workpiece (not shown here). The positioning unit 11 has a support plate 12. The machine tool 1 is placed on the workpiece on this plate. Furthermore, the support plate 12 comprises a through-hole 13. In the present example, this is circular and / or is located in the center of the support plate 12. The through-hole 13 is designed such that a tool located in the tool chuck 31 can be passed through. The drive unit 2 and the positioning unit 11 are translationally connected to one another between a Fig. 1 and a second end position (not shown). In the first end position, these are at their maximum distance from each other, and in the second end position, they are at their maximum proximity to each other. During the movement to the second end position, the tool located in the tool chuck 31 is guided through the through-hole 13.

[0072] As from Fig. As can be seen from Figure 1, the machine tool 1 comprises a guide unit 14 for guiding the translational relative movement between the drive unit 2 and the positioning unit 11. This guide unit is designed such that it applies a spring force to the drive unit 2 and the positioning unit 11, wherein the spring force is directed toward the first end position. As a result, the drive unit 2 and the positioning unit 11 are pushed away from each other by the spring. The guide unit 14 has a first guide support 15 and a second guide support 16. These connect the drive unit 2 and the positioning unit 11 to one another.

[0073] Furthermore, the guide unit 14 includes a locking mechanism 17. This serves to establish a relative position between the drive unit 2 and the positioning unit 11. This has the advantage that the machine tool 1 can be fixed, for example, in the second end position. This eliminates the need for the user to continuously press the drive unit 2 against the workpiece when machining, thus increasing the manageability and precision of the work.

[0074] The Fig. 2-4 show a sectional detailed view of the machine tool 1 in different states in the area of ​​the actuating element 7 with the locking unit 8 according to a first embodiment. The housing 3 of the drive unit 2 comprises a first housing recess 37. The actuating element 7 has a cavity 55. The cavity 55 comprises a cavity opening 56. The actuating element 7 is arranged between the Fig. 2 shown starting position and the one in Fig. 3 shown operating position.

[0075] The actuating element 7 is positioned in the first housing recess 37, which serves to receive and / or guide the actuating element 7. The actuating element 7 has a first part 18 and a second part 19. These can be made of different materials. It is advantageous if the first part 18 is made of a plastic and / or the second part 19 is made of a metal.

[0076] In addition, the locking unit 6 comprises a return spring 22, which applies a spring force to the actuating element 7 in the direction of the initial position. The actuating element 7 comprises a first return spring contact surface 29. Furthermore, the housing 3 has a second return spring contact surface 39. The return spring 22 is positioned between the first return spring contact surface 29 and the second return spring contact surface 39 and rests against them.

[0077] The locking unit 6 of the drive unit 2 comprises according to Fig. 2 a coupling element 23. This is arranged within the return spring 22. The coupling element 23 comprises a first driving element 24 for the actuating element 7. The actuating element 7 has a first guide section 27. This interacts with the first driving element 24 when the actuating element 7 is transferred from the starting position into the actuating position. Furthermore, the coupling element 23 has a second driving element 25. Furthermore, the actuating element 7 comprises a first driving stop 28. This corresponds to the first driving element 24 of the coupling element 23. The first driving stop 28 takes the coupling element 23 with it when the actuating element 7 is moved into the starting position. In the present example, the first driving stop 28 therefore rests against the first driving element 24 of the coupling element 23.

[0078] The locking unit 6 comprises a locking element 20. This is arranged between a Fig. 2 shown unlocking position and one in Fig. 4. The locking element 20 has a second guide section 34 in which the coupling element 23 is guided. Furthermore, the locking element 20 comprises a second driving stop 35. This corresponds to the second driving element 25 of the coupling element 23. The second driving stop 35 serves to drive the locking element 20 through the coupling element 23 when the actuating element 7 is moved into the starting position.

[0079] The housing 3 has a second housing recess 38 for receiving and / or guiding the locking element 20. Furthermore, the locking element 20 comprises a locking region 33.

[0080] The locking unit 6 has a locking spring 21. In the present example, this is arranged within the coupling element 23. The actuating element 7 has a first locking spring contact surface 30. Furthermore, the locking element 20 has a second locking spring contact surface 36. The locking spring 21 is arranged between the first locking spring contact surface 30 and the second locking spring contact surface 36 and rests against them.

[0081] The tool shaft 5 has a locking recess 32 for receiving the locking element 20. The tool shaft 5 is arranged between a Fig. 3 shown neutral position and one in Fig. 4. In the fixing position, the tool shaft 5 is aligned such that the locking region 33 of the locking element 20 can penetrate into the locking recess 32 of the tool shaft 5.

[0082] The locking unit 8 comprises a locking element 10. This is arranged between a Fig. 2 shown unlocked position and one in Fig. 3 and Fig. 4. The locking element 10 is partially arranged in the housing 3. Furthermore, the latter comprises an engagement element 40. This is located at one end of the locking element 10 and / or has a convex sliding surface 41.

[0083] Furthermore, the locking element 10 comprises in the Fig. The first exemplary embodiment shown in Figures 2 to 4 includes an operating area 58 for manually gripping and moving the locking element 10 by the user. This operating area is arranged outside the housing 3. This allows it to be easily gripped by the user. Furthermore, the locking element 10 has a bearing area 45. In this area, the locking element 10 is mounted in the housing 3 for translational movement. The locking element 10 can be moved translationally along a locking axis 43.

[0084] The locking unit 8 has a spring element 46. Furthermore, the locking element 10 comprises a spring receiving area 47 for this spring element 46, which is arranged between the housing 3 and the spring receiving area 47. The spring element 46 applies a spring force to the locking element 10, which pushes the locking element 10 from the unlocked position into the locked position.

[0085] The locking unit 8 comprises a locking area 9 corresponding to the locking element 10. In the Fig. 2, the locking element 10 is not engaged with the locking area 9. In the unlocked position shown in the Fig. 3 and Fig. 4, the locking element 10 and the locking area 9 are operatively connected in such a way that the actuating element 7 is locked in its actuating position. In the position shown in the Fig. In the first embodiment shown in Figures 2 to 4, the locking area 9 is positioned in the actuating element 7.

[0086] Furthermore, the locking unit 8 comprises a first feed surface 49, which is designed in particular as a run-on slope. The first feed surface 49 guides the engagement element 40 of the locking element 10 towards the locking area 9, in particular when the actuating element 7 is pressed into the housing 3 and / or moved into its actuating position. In the present Fig. In the first exemplary embodiment shown in Figures 2 to 4, the first feed surface 49 is arranged on the actuating element 7. The first feed surface 49 is designed such that, upon actuation of the actuating element 7, the locking element 10 slides along the first feed surface 49 and is deflected by means of the sliding surface 41 of the engagement element 40, whereby the spring element 46 is subjected to a spring force. As soon as the actuating element 7 is in the actuating position, the engagement element 40 of the locking element 10 is also aligned with the locking region 9 such that the locking element 10 is moved, in particular pushed or pulled, into the blocking position and / or into the locking region 9 by the spring force of the spring element 46. As a result, the actuating element 7 is locked in the actuating position by the locking element 10.

[0087] The actuating element 7, the locking element 20 and the coupling element 23 are translationally movable along a common locking axis 26. The actuating element 7 can be actuated by the user. This moves it from the initial position ( Fig. 2) in a first direction 50, i.e. into the housing 3, into the actuating position ( Fig. 3-4). The second part 19 transmits the force to the locking element 20 via the locking spring 21, whereby the latter is moved and / or pressed in the direction of the tool shaft 5. If the tool shaft 5 is in its neutral position ( Fig. 3), the locking element 20 cannot penetrate into the locking recess 32 and is blocked by the tool shaft 5. This compresses the locking spring 21 ( Fig. 3). This has the advantage that the actuating element 7 can be moved into the actuating position, even if the locking element 20 cannot be moved into its locking position. By moving the actuating element 7 in the first direction 50, i.e., in particular, into the housing 3, the return spring 22 is subjected to a spring force. In addition, the spring element 46, which is coupled to the locking element 10, is also subjected to a spring force. If the actuating element 7 is in the actuating position, the engagement element 40 of the locking element 10 penetrates into the locking area 9 and locks the actuating element 7. As a result, the locking element 10 is in the locked position ( Fig. 3-4).

[0088] By moving the tool shaft 5, for example by the user, from the neutral position ( Fig. 3), preferably rotationally, into the fixing position ( Fig. 4), the locking area 33 of the locking element 20 penetrates into the locking recess 32 of the tool shaft 5. As in Fig. 3, the locking spring 21, which is loaded with a spring force, transmits the spring force to the locking element 20, whereby the latter is pressed into the locking recess 32 of the tool shaft 5 ( Fig. 4).

[0089] In the Fig. 2 to 4, in order to release the fixed tool shaft 5, the locking element 10 must be moved by the user via the operating area 58 from the locking position ( Fig. 4) into the unlocked position ( Fig. 2). The operating area 58 can be designed such that it can be grasped by the user. As soon as the locking element 10 is released by the user, the actuating element 7 is moved from the actuating position in a second direction 52 into the starting position, since the compressed return spring 22 ( Fig. 4) transmits the spring force to the actuating element 7. When the actuating element 7 is moved towards its initial position, the first driving stop 28 interacts with the first driving element 24 of the coupling element 23, whereby the coupling element 23 is driven in the second direction 52. The second driving element 25 of the coupling element 23 also comes into operative connection with the second driving stop 35 of the locking element 20 and drives the locking element 20 along. This moves the latter from the locking position ( Fig. 4) into the unlocking position ( Fig. 2), whereby the tool shaft 5 can again rotate freely around its axis of rotation 4.

[0090] Fig. 5 shows a detailed view of the machine tool 1 with a second embodiment of the locking unit 8. In the following description of the Fig. 5, for features that are different from the embodiment shown in Fig. 2-4 are identical in their design and / or mode of operation, the same reference numerals are used. Unless otherwise stated, their design and / or mode of operation corresponds to the design and / or mode of operation of the features already described above.

[0091] In contrast to the first embodiment, the locking element 10 in the present second embodiment is arranged on, at least partially in, the actuating element 7. The locking element 10 is arranged in the first part 18 of the actuating element 7. The locking region 9 corresponding to the locking element 10 is arranged in the housing 3. The locking element 10 also has the operating region 58 in the case of the second embodiment. This is arranged outside the actuating element 7 and is therefore accessible to the user. In contrast to the first embodiment, the bearing region 45 in the present second embodiment is arranged in the actuating element 7, in particular in the first part 18 of the actuating element 7. The second embodiment is in Fig. 5 is only visualized in one operating state. In this state, the actuating element 7 is in the actuating position and the locking element 10 is in the blocking position. The return spring 22 applies a spring force to the actuating element 7 and presses it in the second direction 52. As a result, the locking element 10 is pressed against the locking area 9 in the blocking position, whereby it is held in the locking area 9 by friction. Furthermore, the actuating element 7 is locked in the actuating position via the positive connection formed by the locking unit 8. In the Fig. 5, the locking area 9 has a first section 59 and a second section 60. In the Fig. 5 visualized operating state, the locking element 10 is located in the first section 59 of the locking area 9. By transferring the actuating element 7 into the intermediate position, the locking element 10 can be transferred into the second section 60 of the locking area 9.

[0092] To release the actuating element 7, it is moved into an intermediate position not shown here. For this purpose, the actuating element 7 is pressed in the first direction 50, i.e. further into the housing 3. As can be seen from Fig. 5, the locking area 9 and the corresponding engagement element 40 of the locking element 10 have a certain amount of play with respect to one another.

[0093] As a result, the locking element 10 can be moved by the user in the intermediate position of the actuating element 7 from the locked position to the unlocked position. If the locking element 10 is in the unlocked position, the actuating element 7 can be moved from the intermediate position in the second direction 52 to the starting position. Alternatively, the displacement of the locking element 10 into the unlocked position can also occur automatically due to gravity, in particular if the locking element 10 has a correspondingly large mass and / or as in Fig. 5, during intended use, it is movable in the direction of gravity into its unlocked position. In an embodiment not shown here, the locking element 10 could also be designed and / or arranged such that it is movable in the direction of gravity into its locked position. In this case, the actuating element 7 would be automatically locked in its locked position.

[0094] The locking of the actuating element 7 occurs in the reverse order, i.e., from the initial position, through the intermediate position, to the actuating position. Consequently, when the actuating element 7 is in the intermediate position, the locking element 10 is guided into the locking area 9.

[0095] In contrast to the first embodiment, the present second embodiment does not have a spring element 46. In an embodiment not shown, the spring element 46 could be arranged on the locking element 10, in particular in the bearing area 45. It would be advantageous if the spring element 46 could apply a spring force to the locking element 10. Furthermore, it would be advantageous if the spring force of the spring element 46 could move the locking element 10 toward and / or away from the locking area 9. This can further increase user-friendliness.

[0096] Fig. 6 shows a detailed view of the machine tool 1 in section with a third embodiment of the locking unit 8. In the following description of the Fig. 6, for features which are different from the embodiment shown in the Fig. 2 to 4 and to the first embodiment shown in Fig. 5 are identical in their design and / or mode of operation, the same reference numerals are used. Unless otherwise stated, their design and / or mode of operation corresponds to the design and / or mode of operation of the features already described above.

[0097] Fig. Figure 6 shows a sectional side view of the drive unit 2 according to the third embodiment. In this case, the drive unit 2 comprises, as in the case of the Fig. 2 to 4, a spring element 46. However, this is arranged in the actuating element 7. Furthermore, the locking element 10 has the spring receiving area 47. In the locked position of the locking element 10, the spring element 46 is subjected to a spring force and is compressed. In contrast to the first embodiment, the spring force tends to push the locking element 10 from the locked position into the unlocked position.

[0098] Furthermore, the locking unit 8 comprises a first return surface 53. According to the present third exemplary embodiment, this guides the engagement element 40 of the locking element 10 away from the locking region 9 when the actuating element 7 is moved in the first direction 50—i.e., into the housing 3. Furthermore, the locking region 9 comprises an undercut 48. The engagement element 40 of the locking element 10 has an extension 42. This corresponds to the undercut 48 of the locking region 9, so that the locking element 10 is held in its locked position in a form-fitting and / or frictional manner, although the spring element 46 exerts a spring force on the locking element 10 oriented in the direction of the unlocked position.

[0099] To lock the actuating element 7, this is done at the Fig. 6, in its intended use, the locking element 10 is moved by the user from the initial position into the intermediate position, in particular the over-pressed intermediate position. In this position, the locking element 10 is displaced by the user via the operating region 58 into the second section 60 of the locking region 9, whereby the spring element 46 is preferably compressed. By transferring the actuating element 7 from the intermediate position into the actuating position, the locking element 10 is transferred into the first section 59 of the locking region 9, whereby the extension 42 of the locking element 10 comes into operative connection with the undercut 48 of the locking region 9. As a result, the actuating element 7 is locked in the actuating position.

[0100] To release the actuating element 7, it is pulled out of the position shown in the Fig. 6, the locking element 10 is moved in the first direction 50 into the intermediate position. The extension 42 of the locking element 10, which preferably has a ramp as shown, slides along the first return surface 53. In the intermediate position of the actuating element 7, the locking element 10 is automatically moved from the locked position to the unlocked position by the compressed spring element 46. The actuating element 7 can then be moved from the intermediate position in the second direction 52 into the starting position.

[0101] The Fig. The third embodiment shown in Figure 6 has the advantage that the locking element 10 does not have to be manually moved from the locked position to the unlocked position, since this occurs automatically via the spring element 46 acting in the direction of the unlocked position when the actuating element 7 is pushed into its intermediate position. This increases user-friendliness.

[0102] In the Fig. 7 and Fig. 8 shows a detailed view of the machine tool 1 in section with a fourth embodiment of the locking unit 8. In the following description of the Fig. 7 and Fig. 8, for features which, in comparison to the embodiment shown in Fig. 2 to 4 shown first embodiment, to which in Fig. 5 and to the second embodiment shown in Fig. 6 are identical in their design and / or mode of operation, the same reference numerals are used. Unless otherwise stated, their design and / or mode of operation corresponds to the design and / or mode of operation of the features already described above.

[0103] Fig. 7 shows a sectional side view of the drive unit 2 according to the fourth embodiment, in which the actuating element 7 is in the starting position. Fig. 8 shows the actuating element 7 in the actuating position. In the present fourth exemplary embodiment, the actuating element 7 comprises at least one third part 57. This third part 57 is arranged in the cavity 55 of the actuating element 7. The locking region 9 is arranged on the at least one third part 57. In the present exemplary embodiment, the third part 57 is constructed from two components, but it could also be constructed in one piece or from additional components. The third part 57 comprises the first feed surface 49 and the first return surface 53. Furthermore, the locking unit 8 comprises a second feed surface 51. By means of this, the engagement element 40 of the locking element 10 is guided towards the locking region 9 when the actuating element 7 is moved from the intermediate position into the actuating position. The locking unit 8 preferably comprises a second return surface 54.This guides the engagement element 40 of the locking element 10 away from the locking region 9 when the actuating element 7 moves from the intermediate position to the starting position. The second feed surface 51 and the second return surface 54 are arranged on the third part 57.

[0104] The locking element 10 is arranged on the housing 3. Preferably, the locking element 10 extends into the cavity 55 of the actuating element 7. The locking element 10 is mounted for rotational movement in the bearing area 45 on the housing 3. The spring element 46 rests against the spring receiving area 47 of the locking element 10 and is connected thereto.

[0105] To lock the actuating element 7, the user moves it from the initial position ( Fig. 7) is moved in the first direction 50 into the intermediate position not shown here. When the actuating element 7 is moved, the engagement element 40 of the locking element 10 comes into operative connection with the first feed surface 49 and slides along it. In the process, the spring element 46 is compressed. In the intermediate position, the engagement element 40 is pressed onto the second feed surface 51 by a portion of the spring force of the spring element 46.

[0106] When the actuating element 7 is moved from the intermediate position in the second direction 52 into the actuating position, the engagement element 40 slides along the second feed surface 51 in the direction of the locking area 9 and comes into the Fig. 8 shown locking position in the locking area 9. In the locking position, the spring element 46 is at least partially subjected to a spring force.

[0107] To release the locking of the actuating element 7, it is moved from the actuating position in the first direction 50 into the intermediate position. As a result, the engagement element 40 slides along the first return surface 53 out of the locking area 9. When the actuating element 7 is moved from the intermediate position in the second direction 52 into the starting position, the engagement element 40 transitions to the second return surface 54 and slides along it. In the process, the spring element 46 is stretched. When the actuating element 7 is in the starting position, the locking element 10 is moved back into the unlocked position by the spring element 46. In the unlocked position, the spring element 46 is not subjected to any spring force. List of reference symbols 1 machine tool 2 drive unit 3 housings 4 axis of rotation 5 Tool shaft 6 Locking unit 7 Actuating element 8 locking unit 9 Locking area 10 locking element 11 Positioning unit 12 support plate 13 Passage recess 14 Management unit 15 first guide post 16 second guide support 17 Locking mechanism 18 first part 19 second part 20 locking element 21 Locking spring 22 Return spring 23 Coupling element 24 first driving element 25 second driving element 26 Locking axis 27 first guide section 28 first take-away stop 29 first return spring contact surface 30 first locking spring contact surface 31 tool chucks 32 locking recess 33 Locking area 34 second guide section 35 second driving stop 36 second locking spring contact surface 37 first housing recess 38 second housing recess 39 second return spring contact surface 40 engagement element 41 Sliding surface 42 extension 43 Locking axle 45 Storage area 46 spring element 47 Spring receiving area 48 undercut 49 first feed area 50 first direction 51 second feed area 52 second direction 53 first return area 54 second return area 55 cavity 56 Cavity opening 57 third part 58 Operating area 59 First Section 60 Second Section QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2006 061 242 A1

[0002]

Claims

[1] Machine tool (1), in particular a router or drilling machine, for machining a workpiece with a drive unit (2) comprising: a housing (3), a tool shaft (5) rotatable about a rotation axis (4) and a locking unit (6) for rotationally locking the tool shaft (5), which has an actuating element (7), which, when used as intended, can be moved by a user from an initial position to an operating position, characterized by , that the drive unit (2) comprises a locking unit (8) for locking the actuating element (7) in the actuating position, which has a locking area (9) and a corresponding locking element (10), wherein the locking element (10) is movable, during intended use, from an unlocked position into a locked position, in which the locking element (10) is operatively connected to the locking region (9) in such a way that the actuating element (7) is locked in its actuating position. [2] Machine tool according to the previous claim, characterized by that the machine tool (1) comprises a positioning unit (11) for positioning the machine tool (1) relative to the workpiece and / or that the drive unit (2) and the positioning unit (11) are movable relative to one another, in particular translationally, between a first end position in which they are maximally spaced from one another, and a second end position in which they are maximally close to one another. [3] Machine tool according to one of the preceding claims, characterized bythat the locking unit (8) is designed such that it can lock the actuating element (7) in its actuating position when the drive unit (2) and the positioning unit (11) are located outside the second end position, in particular when the drive unit (2) and the positioning unit (11) are located in the first end position. [4] Machine tool according to one of the preceding claims, characterized by that the actuating element (7) for activating the locking unit (6) is movable from the starting position, in particular via an intermediate position, into the actuating position and / or that the actuating element (7) for deactivating the locking unit (6) is movable from the actuating position, in particular via the intermediate position, into the starting position. [5] Machine tool according to one of the preceding claims, characterized bythat the actuating element (7) comprises a first part (18) and a second part (19), which are preferably connected to one another in a form-fitting and / or force-fitting and / or non-detachably manner. [6] Machine tool according to one of the preceding claims, characterized by that the locking unit (6) comprises a locking element (20) for rotationally locking the tool shaft (5), which is movable, in particular translationally, between an unlocking position and a locking position. [7] Machine tool according to one of the preceding claims, characterized by that the locking element (10) is arranged on the actuating element (7) and the locking region (9) is arranged on the housing (3) or that the locking element (10) is arranged on the housing (3) and the locking region (9) is arranged on the actuating element (7). [8] Machine tool according to one of the preceding claims, characterized bythat the locking element (10) comprises an engagement element (40) for engaging, in particular positively and / or non-positively, in the locking region (9) and / or that the engagement element (40) comprises an extension (42) which preferably projects in the transverse direction of the locking element (10). [9] Machine tool according to one of the preceding claims, characterized by that the locking element (10) is movable translationally along a locking axis (43) or rotationally about a rotation axis. [10] Machine tool according to one of the preceding claims, characterized by that the locking element (10) comprises a bearing region (45) in which the locking element (10) is movably mounted, preferably in the housing (3) or in the actuating element (7), in particular translationally or rotationally. [11] Machine tool according to one of the preceding claims, characterized bythat the locking unit (8) comprises a spring element (46) and that this is arranged and / or designed in such a way that it applies a spring force to the locking element (10) in the unlocked position in the direction of the locked position or that it applies the spring force to the locking element (10) in the locked position in the direction of the unlocked position or that it applies the spring force to the locking element (10) as soon as the locking element (10) is moved out of the unlocked position. [12] Machine tool according to one of the preceding claims, characterized by that the locking element (10) comprises a spring receiving area (47) in which the spring element (46) rests against the locking element (10) and / or is connected thereto, in particular in a tensile and / or compressive direction of the spring element (46). [13] Machine tool according to one of the preceding claims, characterized bythat the locking area (9) is a locking recess and that this is designed to be free of play and / or to correspond to the engagement element (40) of the locking element (10) in such a way that the actuating element (7) is immovably locked in the actuating position when the locking element (10) is in the blocking position. [14] Machine tool according to one of the preceding claims, characterized by that the locking recess is designed with play and / or corresponding to the engagement element (40) of the locking element (10) in such a way that the actuating element (7) can be moved, in particular overpressed, from the actuating position into the intermediate position when the locking element (10) is in the blocking position. [15] Machine tool according to one of the preceding claims, characterized by that the locking area (9) comprises an undercut (48) which is preferably designed to correspond to the extension (42) of the engagement element (40). [16] Machine tool according to one of the preceding claims, characterized by that the locking unit (8) comprises a first feed surface (49) by means of which the engagement element (40) of the locking element (10) can be guided to or into the locking region (9) when the actuating element (7) is moved in a first direction (50) in which the actuating element (7) moves into the housing (3) and / or that the locking unit (8) comprises a second feed surface (51) by means of which the engagement element (40) of the locking element (10) can be guided into the locking region (9) when the actuating element (7) is moved in a second direction (52) opposite to the first direction (50), in particular from the intermediate position. [17] Machine tool according to one of the preceding claims, characterized bythat the locking unit (8) comprises a first return surface (53) by means of which the engagement element (40) of the locking element (10) can be guided out of the locking region (9) when the actuating element (7) is moved in the first direction (50) and / or that the locking unit (8) comprises a second return surface (54) by means of which the engagement element (40) of the locking element (10) can be guided away from the locking region (9) when the actuating element (7) is moved in the second direction (52). [18] Machine tool according to one of the preceding claims, characterized by that the actuating element (7) comprises at least one third part (57), which is preferably arranged in a cavity (55) of the actuating element (7), and / or that the first feed surface (49), the second feed surface (51), the locking recess, the first return surface (53) and / or the second return surface (54) are formed on the at least one third part (57). [19] Machine tool according to one of the preceding claims, characterized by that the locking element (10) comprises an operating area (58) for manual gripping and moving of the locking element (10) by a user and / or that the operating area (58) is arranged outside the housing (3).

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