Tooling and methods

Abstract

The present invention relates to a tool arrangement (10) having a drivable tool (1), which comprises a shaft (2) connected to the tool (1) and one or more brake bodies (3), which are arranged in particular distributed around the shaft (2) in the circumferential direction (4), wherein the tool arrangement (10) is configured to move the brake body (3) from a released state to a braked state within a braking process, wherein the brake body (3) is (is) in contact with the shaft (2), whereby a braking force acts on the shaft (2), thus braking the shaft (2) and thereby the tool (1), and wherein in the released state the brake body (3) is (is) not in contact with the shaft (2).

Description

[Technical field]

[0001] The present invention relates to a tool arrangement with a drivable tool, which comprises a shaft connected to the tool, and expediently, the tool can be driven via the shaft. [Background technology]

[0002] No. 5,399,633 describes a table saw having a braking mechanism comprising at least one catch which is engaged with the rotating saw blade for stopping the saw blade. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] European Patent Specification No. 1 234 285 B1 Summary of the Invention [Problem to be solved by the invention]

[0004] SUMMARY OF THE DISCLOSURE It is an object of the present invention to provide a tool device which can be operated with minimal effort. [Means for solving the problem]

[0005] This problem is solved by a tool arrangement according to claim 1. The tool device comprises at least one braking body, the tool device being configured to move the at least one braking body from a released state to a braked state within a braking stroke. In the braking state, at least one of the brake bodies is in contact with the shaft and thereby a braking force acts on the shaft and thus the tool is braked, whereas in the released state, at least one of the brake bodies is not in contact with the shaft. Effect of the Invention

[0006] In the prior art described at the outset, a catch is engaged with the saw blade in order to stop the saw blade, which usually results in damage to the saw blade and the catch, so that both the saw blade and the catch have to be replaced in order for the table saw to be able to be operated further.

[0007] In contrast to this, in the described tool device, the tool and / or at least one braking body are expediently also undamaged and / or still usable after braking of the tool, and therefore no replacement is necessary for further operation.

[0008] For this reason, the described tool arrangement can be operated with little effort.

[0009] According to an advantageous embodiment, the tool device comprises a number of brake bodies which are arranged distributed around the axis in a circumferential direction, which may also be called a circulation direction, and which is designed to move the brake bodies from a released state to a braked state within the scope of the braking process. In the braking state, the braking elements are in contact with the shaft and thereby a braking force acts on the shaft, thus braking the tool, and in the released state, the braking elements are not in contact with the shaft.

[0010] Advantageous further configurations are the subject of the dependent claims.

[0011] The invention further relates to a method for braking a tool connected to a shaft, the method comprising the following steps: A change from a released state in which at least one brake body is not in contact with the shaft to a braked state in which at least one brake body is in contact with the shaft, and this causes a braking force to act on the shaft and therefore brake the tool. It has steps.

[0012] In an advantageous embodiment of the method, a number of brake bodies are provided, which are arranged in a circumferential direction and distributed around the axis, and during the alternating step the brake bodies are moved from a released state to a braked state. In the released state, the brake elements are not in contact with the shaft, in the braked state, the brake elements are in contact with the shaft and thereby a braking force acts on the shaft, thus braking the tool.

[0013] Further exemplary details as well as exemplary embodiments are described below in conjunction with the figures. [Brief description of the drawings]

[0014] [Figure 1] FIG. [Diagram 2] 4 is a cross-sectional view of the brake device and the shaft of the tool device, the tool device being in a braked state; [Diagram 3] 4 is a cross-sectional view of the brake device and the shaft of the tool device, the tool device being in a released state; [Figure 4] FIG. [Diagram 5] FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] In the following description, reference is made to the directions "x", "y" and "z" indicated in the figures (the x-direction extends perpendicular to the plane of the drawing in Figures 1 to 4). The x-, y- and z-directions are oriented orthogonal to one another. The x- and y-directions may equally be referred to as horizontal directions and the z-direction as vertical direction. The directions “radial” and “axial” referred to below should be understood in particular in relation to the longitudinal axis of shaft 2 .

[0016] 1 shows a tool arrangement 10 with a drivable tool 1. The tool arrangement 10 has a shaft 2 connected to the tool 1, via which the tool 1 can be driven in an expedient manner.

[0017] The tool device 10 further comprises a number of brake bodies 3, which are shown exemplarily in Figures 2 and 3. For better clarity, in Figures 2 and 3, respectively, only three of the fourteen brake bodies shown are provided with the reference "3". These braking bodies 3 are arranged distributed around the shaft 2 in the circumferential direction 4 .

[0018] Alternatively, it is also possible for the tool device 10 to be equipped with only one brake body as well.

[0019] The tool device 10 is configured to move the brake body 3 from a released state to a braked state within a braking stroke.

[0020] 2, the brake bodies 3 are in contact with the shaft 2. By this contact, the brake bodies 3 exert a braking force on the shaft 2, by which the shaft 2 and thus also the tool 1 are braked.

[0021] In the released state, the brake body 3 is not in contact with the shaft 2 .

[0022] Further exemplary details are provided below.

[0023] First of all, regarding the tool device 10:

[0024] The tool arrangement 10 is, by way of example, a saw, in particular a saw with a rotating saw blade as the tool 1. Advantageously, the tool arrangement is a table circular saw. Alternatively, for this purpose, it is also possible for the tool arrangement to be designed as another tool arrangement as well. In particular, it is possible for the tool arrangement 10 to be designed as a stationary or semi-stationary machine. Furthermore, it is also possible for the tool arrangement 10 to be designed as a manually operated machine, in particular as a manually operated tool arrangement. Advantageously, the tool device 10 is configured as a cut-off saw, a plunge saw, a reciprocating rotary saw, a band saw, a jigsaw, a router and / or an angle grinder. The tool device 10 is in particular a power tool.

[0025] The tool arrangement 10 exemplarily comprises a tool 1, a shaft 2, a drive unit 5, an actuator unit 6 and a control unit 7. Furthermore, the tool arrangement 10 expediently comprises a carrying structure 8 and / or a bearing surface 9.

[0026] The carrier structure 8 is, by way of example, configured as a housing, in which the drive unit 5, the actuator unit 6 and / or the control unit 7 are accommodated in a suitable manner.

[0027] A rest surface 9 is exemplarily arranged on the upper side of the carrier structure 8. This rest surface 9 is used for the rest of the workpiece 11 while it is being processed by the tool 1. Exemplarily, this rest surface 9 embodies the xy plane. Exemplarily, the tool 1 protrudes from the rest surface 9 in particular in the z direction.

[0028] The drive unit 5 is illustratively configured as a rotary drive, in particular an electrical rotary drive, which is used to drive the tool 1, in particular to rotate the tool 1, preferably in a clockwise direction. The tool 1 is connected to the drive unit 5 via a shaft 2. The drive unit 5 is configured to drive, in particular to rotate, the shaft 2, so that in turn the tool 1 is also driven. By way of example, the tool 1 is non-rotatably connected to the shaft 2 and therefore rotates together with the rotating shaft 2 .

[0029] The shaft 2 is in particular the shaft of the drive train of the tool device 10. The shaft 2 and the tool 1 are supported in a rotatable manner in a carrying structure 8.

[0030] The shaft 2 is aligned parallel to the x-direction with its longitudinal axis. By way of example, the shaft 2 has a cylindrical basic form. The axis of rotation of the tool 1 is expediently aligned parallel to the x-direction. By way of example, the shaft 2 and the tool 1 are aligned coaxially with respect to one another.

[0031] The actuator unit 6 is expediently used for selectively moving the brake body 3 into a braked or released state, as will be explained in more detail below.

[0032] The control unit 7 is expediently designed to provide the drive unit 5 with a drive unit control signal for causing the drive unit 5 to drive the tool 1 .

[0033] The control unit 7 is furthermore expediently configured to provide the actuator unit 6 with an actuator unit control signal for causing the actuator unit 6 to move the brake body 3 into a braked state and / or a released state.

[0034] The control unit 7 is furthermore expediently configured to detect a dangerous situation and, on the basis of this detected dangerous situation, to trigger a braking process, in particular by providing an actuator unit control signal to the actuator unit 6.

[0035] This dangerous situation is in particular a potentially dangerous situation for a user, in which the user can be injured, for example, by the tool and / or the workpiece.

[0036] The control unit 7 is expediently designed to detect a dangerous situation on the basis of a detected contact between the tool 1 and a human body, for example a finger.

[0037] The control unit 7 is expediently furthermore designed to detect kickback as a dangerous situation.

[0038] By the term "kickback" is meant in particular a situation in which, during machining of a workpiece by a tool device, sudden and unexpected forces arise between the tool device and the workpiece, which forces cause the tool device and / or the workpiece to move.

[0039] Advantageously, the tool arrangement 10, in particular the control unit 7, is designed to supply the tool 1 with an electrical detection signal and to detect a dangerous situation on the basis of a change in this detection signal. Expediently, the tool arrangement 10, in particular the control unit 7, is designed to supply an electrical detection signal by capacitive coupling to the tool 1. Expediently, the tool arrangement 10, in particular the control unit 7, is designed to detect a dangerous state, in particular a contact between the tool 1 and a human body, on the basis of a capacitive change. Further details on how the detection of a dangerous situation can be exemplarily achieved are described in US Pat. No. 5,399,633.

[0040] The braking device 12 is described in detail below in conjunction with FIGS.

[0041] The tool arrangement 10 comprises a braking device 12, which comprises the above-mentioned braking bodies 3, by means of which the shaft 2, and thus also the tool 1, can be braked. The tool arrangement 10 is designed in such a way that a braking process of the tool 1 is carried out with the use of the braking device 12. In particular, the tool device 10 is configured such that, by carrying out this braking process, the tool 1 is stopped from the driven, in particular rotating, state in which the workpiece 11 is or can be processed in an expedient manner within 5 ms or less.

[0042] The brake device 12 is preferably configured as a freewheel brake and is expediently integrated in the tool device 10. The brake device 12 is in particular a brake that is actively switched on (preferably via the control unit 7 and / or the actuator unit 6). The brake device 12 is particularly configured to be reversible, so that it can be moved from a braked state back to a released state (and from there, appropriately, back to the braked state) without the components of the brake device 12 having to be replaced for this purpose.

[0043] The braking device 12 exemplarily comprises a braking body 3 , a braking portion 14 , a holding portion 15 and an actuating portion 16 .

[0044] The braking device 12 functions in particular as follows: For braking the tool 1, first of all the actuating part 16 is expediently moved, in particular rotated, by the actuator unit. By this movement of the actuating part 16, the brake bodies 3 are expediently moved from the released state into the braked state, in particular by respective pivoting of these brake bodies 3. Expediently, the brake bodies 3 come into contact with the shaft 2 on the way from the released state to the braked state and are assisted in moving them to the braked state by the rotational movement of the shaft 2. In the braked state, the brake bodies 3 are clamped between the shaft 2 and the brake part 14. In particular, due to the support, in particular radial and / or tangential support, of the brake bodies 3 at the brake part 14, these brake bodies 3 exert a braking force on the shaft 2 by which the shaft 2 and thus also the tool 1 are braked, in particular up to the point of the tool 1 coming to a standstill.

[0045] Exemplary embodiments of the individual components of the braking device 12 are described in detail below.

[0046] First of all, with regard to the braking part 14:

[0047] The braking part 14 is, by way of example, a part of the carrying structure 8 or is non-rotatably connected to this carrying structure 8, in particular a carrying structure 8 configured as a casing. In particular, this braking part 14 is a fixed part, in particular relative to the shaft 2. Expediently, this braking part 14 does not rotate with the shaft 2 .

[0048] According to a possible embodiment, the braking part 14 is configured as a braking drum.

[0049] By way of example, the braking portion 14 surrounds the shaft 2, in particular in the circumferential direction 4. In particular, this braking portion 14 grips this shaft 2 from the periphery. Expediently, this braking part 14 further surrounds the braking body 3 and in particular the holding part 15 and / or the actuating part 16 .

[0050] The brake part 14 defines, for example, a particularly cylindrical inner chamber 19, in which the brake body 3 and the shaft 2 are arranged. Expediently, in this cylindrical inner chamber 19, the holding part 15 and / or the actuating part 16 are also arranged.

[0051] The braking part 14 expediently provides a braking surface 21. This braking surface 21 is expediently an inwardly directed surface of the braking part 14, in particular a surface which defines the cylindrical inner chamber 19. This braking surface 21 exemplarily has the shape of a cylinder jacket. Expediently, this braking surface 21 supports the braking body 3 .

[0052] The brake part 14 is expediently configured as an outer ring, the brake body 3 being expediently supported on the inner circumference of this brake part 14.

[0053] Next, the brake 3 will be described.

[0054] By way of example, 14 brake bodies 3 are provided. Expediently, it is also possible to provide more or fewer brake bodies 3. Advantageously, at least 3, 5, 7, 10, 12 or 14 brake bodies 3 are provided.

[0055] The brake bodies 3 are expediently separate from one another, in particular individual parts.

[0056] The brake bodies 3 are distributed around the shaft 2, in particular around the longitudinal axis of the shaft 2. The brake bodies 3 are arranged around the shaft 2, in particular in the circumferential direction 4. The brake bodies 3 are expediently located in a ring-shaped region surrounding the shaft 2 and / or are arranged coaxially with respect to the shaft 2. Advantageously, these braking bodies 3 are located exclusively within this ring-shaped region, which is in particular a radial region in relation to the shaft 2. This ring-shaped region is located in particular between the shaft 2 and the braking part 14.

[0057] The brake bodies 3 are expediently arranged uniformly around the shaft 2, in particular at equal angular intervals. The brake bodies 3 are expediently located on a circular path extending around the shaft 2.

[0058] The brake body 3 is expediently arranged between the shaft 2 and the brake part 14, in particular radially (with respect to the longitudinal axis of this shaft 2). Expediently, the brake bodies 3 are supported radially on this brake part 14. The brake bodies 3 are fixed, in particular in the radial direction, on this brake part 14. The brake bodies 3 are fixed relative to this brake part 14, in particular in the circumferential direction. Expediently, the brake bodies 3 are fixed in the circumferential direction to a holding part 15. The holding part 15 is expediently connected to the brake part 14 in a non-rotatable manner.

[0059] The brake bodies 3 are each mounted in a pivotable manner in relation to the brake part 14 and / or the retaining part 15. Each brake body 3 is mounted in a pivotable manner about its own (virtual) pivot axis. The pivot axes of these brake bodies 3 expediently run parallel to the x direction and / or parallel to the longitudinal axis of the shaft 2 .

[0060] Advantageously, the brake bodies 3 are preloaded and / or spring loaded relative to the brake part 14 and / or the retaining part 15. The preloading and / or spring loading of these brake bodies 3 expediently exerts a rotational torque on the respective brake body 3 relative to the respective pivot axis, in particular in the clockwise direction.

[0061] The brake bodies 3 each comprise a first contact portion 17 with a slope-shaped first contact contour 18 which is in contact with the shaft 2 in the braking state.

[0062] An exemplary embodiment of the brake body 3 will be described in connection with Fig. 4. This description applies expediently to a number of brake bodies 3, in particular to all brake bodies 3, of the brake device 12.

[0063] The damping body 3 extends, by way of example, along a body axis 22 which expediently lies in the yz-plane and preferably extends orthogonally to the x-direction and / or to the longitudinal axis of the shaft 2. The extension of the brake body 3 along the body axis 22 is advantageously greater than the extension of the brake body 3 along a transverse axis 23, which extends perpendicular to the body axis 22 and lies in the yz-plane. Exemplarily, the extension of the brake body 3 in the direction of the body axis 22 is at least 1.5 times greater than the extension of the brake body 3 in the direction of the transverse axis 23.

[0064] Alternatively, the extension of the brake body 3 along the body axis 22 is the same as or smaller than the extension of the brake body along the transverse axis 23 .

[0065] The brake body 3 has a first side 31 and a second side 32 , which are respectively located on opposite sides of the body axis 22 .

[0066] The damping body 3 exemplarily comprises a bearing part 24, which is arranged centrally in the direction of the body axis 22. The bearing part 24 advantageously comprises a first convex region 25 and a second convex region 26. The convex regions 25, 26 are illustratively oriented in opposite directions and / or perpendicular to the lateral axis 23. Exemplarily, the first convex region 25 is located on a first side 31 and the second convex region 26 is located on a second side 32. By way of example, these convex regions 25, 26 each have the shape of a segment of a circle.

[0067] The brake body 3 is pivotably supported in the holding part 15, for example by means of a bearing part 24 of the brake body, in particular by means of raised areas 25, 26. The shape of the raised areas 25, 26 determines in an expedient manner the pivoting movements that can be performed by the brake body 3.

[0068] A first contact part 17 is exemplarily connected to the bearing part 24 in a first direction, in particular along the body axis 22. This first contact part 17 is used for contacting the shaft 2 in the braking state.

[0069] The contact portion 17 has a slope-shaped first contact contour 18 which, in the braking state, is in contact with the shaft 2. The contact contour 18 is, by way of example, aligned perpendicularly to the body axis 22. The contact contour 18 by way of example has a curved, in particular convex, course.

[0070] Expediently, the radius of the brake body 3 along the circumference is changed, in particular the radius of the brake body 3 - for example the distance between the pivot axis of the brake body 3 and the contact contour 18 - increases along the circumference direction 33 of the first contact contour. The circumferential direction 33 of this contact profile exemplarily runs from the second side 32 to the first side 31 and / or against the direction of rotation of the shaft 2 .

[0071] A second contact portion 27 is exemplarily connected to the bearing portion 24 in a second direction opposite to the first direction, in particular along the body axis 22. This second contact portion 27 is used to contact the braking portion 14 in a braking state.

[0072] The second contact part 27 is, for example, provided with a second contact contour 28, which in the braking state is in contact with the braking part 14. The contact contour 28 is, for example, aligned perpendicularly to the body axis 22. The contact contour 28, for example, has a curved, in particular convex, course.

[0073] The damping body 3 expediently further comprises a first recessed region 34 and a second recessed region 35. The first recessed region 34 expediently provides a transition from the bearing part 24 to the first contact part 17, which is located on the first side 31. The second recessed region 35 expediently provides a transition from the bearing part 24 to the second contact part 27, which is located on the second side 32.

[0074] As shown in FIG. 3, in the released state, the brake bodies 3 abut expediently by means of their first and second recessed areas 34, 35 against the holding part 15.

[0075] Optionally, the damping body 3 further comprises a third recessed region 44 and a fourth recessed region 45. The third recessed region 44 expediently provides a transition from the bearing part 24 to the first contact part 17, which is located on the second side 32. The fourth recessed region 45 expediently provides a transition from the bearing part 24 to the second contact part 27, which is located on the first side 31.

[0076] Below we explain axis 2 in more detail:

[0077] The shaft 2 expediently has an axial portion 36, with which the brake body 3 comes into contact in the braking state. This axial portion 36 is preferably designed cylindrically. The base surface of this axial portion 36 preferably has a precisely circular shape. In the braking state, the brake body 3 rests expediently against an outer jacket surface 37 of this axial portion 36. This jacket surface 37 of the axial portion 36 expediently has the shape of a cylindrical (outer) jacket surface 37. This jacket surface 37 of the axial portion 36 expediently does not have any protrusions and / or any recesses. The jacket surface of this axial portion 36 is configured in particular to be smooth and / or smooth.

[0078] The holding portion 15 is described in detail below:

[0079] The retaining portion 15 serves in particular to support the brake bodies 3 in the circumferential direction and / or to provide a pivotable bearing for these brake bodies 3 .

[0080] The holding part 15 is, by way of example, configured as a cage, in particular as a freewheel cage, which is in particular configured in the shape of a ring and / or a cylinder and is expediently arranged coaxially to the axis 2.

[0081] The holding part 15 is expediently arranged, in particular in the radial direction, between the shaft 2 and the brake part 14. Expediently, this holding part 15 extends around the shaft 2 or grips it circumferentially. Expediently, this holding part 15 is arranged at a distance from this shaft 2.

[0082] Advantageously, the holding part 15 is fixed to the brake part 14. In particular, the holding part 15 is mounted such that it cannot rotate relative to the brake part 14. The holding part 15 is mounted in such a way that it cannot rotate together with the shaft 2.

[0083] The retaining portion 15 comprises a number of retaining segments 38. By way of example, the number of these retaining segments 38 is the same as the number of brake bodies 3. For better clarity, in Figures 2 and 3 respectively only three of the fourteen shown retaining segments 38 are provided with the reference "38".

[0084] The holding segments 38 are expediently located on a circular path extending around the shaft 2. Exemplarily, the holding segments 38 are spaced apart from the shaft 2 and / or from the braking part 14.

[0085] The retaining segments 38, by way of example, each have the shape of a ring portion. Each retaining segment 38 is arranged expediently between two brake bodies 3. Each retaining segment 38 extends expediently from the bearing part 24 of the first brake body 3 to the bearing part 24 of the second brake body 3.

[0086] Below, we will explain in detail the actuating portion 16. One exemplary embodiment of this actuating portion 16 is shown in FIG.

[0087] The actuating part 16 is in particular used for bringing about a movement of the brake body 3 from the release position to the braking position and / or from the braking position to the release position.

[0088] The actuating part 16 is expediently arranged, in particular in the radial direction, between the shaft 2 and the brake part 14. Advantageously, this actuating part 16 is arranged, in particular in the radial direction, between the shaft 2 and the holding part 15. Expediently, this actuating part 16 extends around the shaft 2 or circumferentially grips this shaft 2. Expediently, this actuating part 16 is arranged at a distance from the shaft 2.

[0089] Advantageously, the actuating part 16 is mounted so as to be movable, in particular so as to be rotatable, relative to the holding part 15 and / or relative to the brake part 14. Expediently, the actuating part 16 is mounted so as to be rotatable, in particular about an axis of rotation which runs parallel to the x-direction.

[0090] The actuating part 16 is in particular designed in the shape of a ring and / or in the shape of a cylinder and is expediently arranged coaxially to the axis 2. This actuating part 16 is expediently designed as an actuating ring.

[0091] The actuating part 16 expediently comprises a base part 39, which is in particular ring-shaped and is aligned coaxially in the x-direction. The actuating part 16 advantageously comprises a number of actuating projections 41, which expediently extend in the x-direction, in particular starting from the base part 39. By way of example, the number of actuating projections 41 is the same as the number of brake bodies 3. The actuating projections 41 are in particular configured as actuating pins. For better clarity, in FIGS. 2, 3 and 5 only three actuating projections 41 are respectively provided with the reference "41".

[0092] The actuating projection 41 is expediently located on a circular path extending around the shaft 2. By way of example, this actuating projection 41 is spaced apart from the shaft 2 and / or the braking part 14.

[0093] Each actuating projection 41 is expediently arranged between two brake bodies 3. In the released state, each actuating projection 41 expediently bears against the respective brake body 3.

[0094] As already mentioned above, the actuating part 16 is in particular supported for a rotational movement, the movement of which is also to be referred to as the actuating movement. During this actuating movement, the actuating part 16 expediently rotates through an angle of less than 90°, in particular less than 45° or less than 30°.

[0095] The actuating part 16 is subjected to an actuating movement by the actuator unit 6 in a targeted manner.

[0096] To effect an actuating movement of the actuating part 16, the actuator unit 6 expediently comprises an electric actuator. Expediently, to effect an actuating movement of the actuating part 16, the actuator unit 6 comprises a reciprocating magnet and / or a piezo unit. Alternatively or additionally, the actuator unit 6 is provided with a pneumatic cylinder for effecting an actuating movement of the actuating part 16 .

[0097] Furthermore, it is possible for the actuator unit 6 for moving the actuating part 16 into the state of actuating movement to comprise differently formed actuators, in particular piezoelectric actuators, electromagnetic actuators, shape memory alloy actuators (FGL-Aktor), electroactive polymer actuators (EAP-Aktor), magnetic shape memory alloy actuators (MSN-Aktor), pneumatic actuators, hydraulic actuators, pyroactuators (Pyroaktor), mechanical actuators, electrostrictive actuators and / or thermal actuators.

[0098] The braked and released states are explained in detail below.

[0099] First of all, regarding the release state:

[0100] In the released state, there is expediently no contact between the brake body 3 and, in particular, the rotating shaft 2. In this released state, there is expediently a gap, in particular an air gap, between the brake body 3 and the shaft 2, in particular in the radial direction (relative to the longitudinal axis of the shaft 2). In this released state, the brake body 3 does not exert any braking force on the shaft 2 and / or the tool 1 .

[0101] In the example shown, the brake body 3 is in contact with the brake part 14 in the released state. Alternatively to this, the brake device 12 can likewise be configured in such a way that the brake body 3 is not in contact with the brake part 14 in the released state.

[0102] The respective body axes 22 of the brake bodies 3 are expediently oriented in different spatial directions and, in the released state, the respective body axes 22 are pivoted relative to the radial direction (with respect to the axis 2), in particular by the same angle in each case.

[0103] By way of example, the brake bodies 3 are held in the released state by the actuating part 16. By way of example, an actuating projection 41 rests on each brake body 3, which holds the respective brake body 3 in the pivoted position. The respective actuating projection 41 rests expediently on the bearing part 24 and / or on the first contact part 17 of the respective brake body 3.

[0104] Expediently, in the released state, there is no contact between the rotating and stationary members and therefore, in particular, no loss torque.

[0105] The braking state is described below.

[0106] Exemplarily, the brake body 3 is in contact with the brake portion 14 in the braking state.

[0107] In this braking state, the brake bodies 3 are clamped, in particular in the radial direction (with respect to the longitudinal axis of the shaft 2) between the brake part 14 and the shaft 2. For the sake of simplicity, the brake bodies 3 can also be referred to as clamping bodies. In the braking state, the brake bodies 3 expediently connect the shaft 2 and the brake part 14 in a frictional engagement. In particular, in this braking state, the brake bodies 3 are connected in a frictional engagement with the shaft 2 and the brake part 14, respectively.

[0108] In the braked state, the brake bodies 3 are respectively pivoted about their own pivot axis in the released state. The body axes 22 of the brake bodies 3 are expediently oriented in different spatial directions. Expediently, the body axes 22 of the brake bodies 3 are radially aligned (with respect to the axis 2).

[0109] In the following it will be explained in detail how the brake body 3 is moved from the release position to the brake position.

[0110] The tool device 10 is designed to move the brake bodies 3 from a released state to a braked state by pivoting the brake bodies 3. Expediently, the brake bodies 3 are all pivoted in the same direction of rotation, in particular opposite to the direction of rotation of the shaft 2. Expediently, the pivoting takes place inwards, in particular about an axis parallel to the axis of rotation of the shaft, the change in effective diameter of these brake bodies being provided by a slope-shaped contour. Expediently, the tool device 10 is furthermore designed in such a way that the brake bodies 3 are moved from a braked state to a released state by pivoting the brake bodies 3. Expediently, the tool device 10 is designed in such a way that by pivoting the individual brake bodies 3, a braking force connection between the shaft 2 and the brake part 14 is selectively formed or released.

[0111] The actuating part 16 is expediently in contact with the brake bodies 3. The tool device 10 is advantageously designed to subject the actuating part 16 to an actuating movement, in particular a rotational movement of the actuating part 16, in order to bring about the transition of the brake bodies 3 from a released state into a braked state.

[0112] Expediently, the tool device 10 is designed in such a way that it brings about an actuating movement of the actuating part 16 as a result of a detected dangerous situation.

[0113] The pivoting of the brake body 3 from the released state is expediently brought about by an actuating movement of an actuating part, in particular a movement of the actuating part 16 relative to the holding part 15 and / or relative to the brake part 14.

[0114] According to the exemplary embodiment, the brake bodies 3 are preloaded. The preloading of the brake bodies 3 is expediently achieved in that the brake bodies 3 are spring loaded, in particular by means of one or more spring elements (not shown in the figures). In the released state, the actuating parts 16 prevent preloading, in particular by means of a positive engagement, and therefore prevent or block a pivoting movement of these brake bodies 3. In particular, the actuating parts 16, for example actuating projections, are arranged in the respective pivot paths of these brake bodies 3, so that these brake bodies 3 cannot be pivoted in the direction towards the braking state. By the actuating movement of the actuating part 16, the blocking of the pivoting movement by the actuating part 16 is released; and, by way of example, the actuating projections 41 are respectively moved out of the pivoting path of the brake bodies. The pivoting path required for the pivoting of the brake bodies 3 is released. By way of the preloading of the brake bodies 3, the pivoting of the brake bodies 3 takes place. In particular, the first contact part 17 is pivoted towards the axis 2. By way of example, this pivoting takes place in the clockwise direction.

[0115] According to an alternative embodiment, the actuating part 16 is used for pushing the brake bodies 3 into a pivoting movement and thus for moving them from the released state into the braked state. Expediently, the brake bodies 3 are actively pivoted by the actuating part 16. In this alternative embodiment, the brake body 3 is expediently not preloaded and / or not spring loaded.

[0116] The brake device 12 is expediently designed in a self-supporting manner, so that the movement of the axle 2 is utilized to increase the braking action of the brake body 3 on the axle 2 and / or to shorten the braking time.

[0117] The tool device 10 is designed to move the brake bodies 3 from a release state to a dragging state and from this dragging state to a braking state within the scope of the braking process, which is provided in particular in a pivot position of the brake bodies 3 between the release state and the braking state, in which the brake bodies 3 are dragged by the movement of the shaft 2, so that the transition to the braking state is assisted by this movement of the shaft 2.

[0118] Starting from the released state, the brake bodies 3 are therefore moved into an entrained state in which there is a state of contact between the brake bodies 3 and the shaft 2, in particular between the first contact portion 17 and the shaft 2. Due to this contact, the brake bodies 3 are entrained by the rotational movement of this shaft 2. Expediently, in the entrained state, the brake bodies 3 are entrained by this shaft 2 in the same direction in which they moved before the entrained state.

[0119] By way of example, the brake bodies 3 are moved from the released state first of all in a first direction, by way of example in a clockwise direction, and during this movement the brake bodies 3, in particular the first contact portion 17, are guided towards the shaft 2 until they come into contact with this shaft 2 and an entrainment state is established. In this entrained state, the brake bodies 3 are moved further in the first direction by rotation of the shaft 2 until the brake bodies 3 are in the braked state. The shaft 2 rotates, by way of example, counterclockwise.

[0120] Advantageously, in the braking state, the braking force exerted by the brake body 3 on the shaft 2 is greater than in the entraining state.

[0121] As already mentioned above, the contact contour 18 is designed in the form of a slope. During the pivoting movement of the brake bodies 3, this contact contour 18 rolls expediently on the shaft 2. Due to the increasing radius of this contact contour, the brake bodies 3 are pressed more and more firmly against this shaft 2. In particular, these brake bodies 3 are clamped or compressed more and more firmly between the shaft 2 and the brake part 14 during the pivoting movement, so that the braking force is expediently increased more and more.

[0122] An exemplary operation of the tooling apparatus 10 is described below.

[0123] Expediently, the tool 1 is driven by a drive unit 5. A workpiece 11 is machined by means of the driven tool 1. During this machining, contact between the tool 1 and the human body of the user can occur. The control unit 7 detects this contact as a dangerous situation and, on the basis of this, initiates the brake device 12. The actuator unit 6 moves the actuating part 16, whereby the brake body 3 is moved into the braking state, whereby in turn the shaft 2 and the tool 1 are braked up to a standstill. This braking takes place in particular within a time period of less than 5 ms.

[0124] Expediently, the brake body 3 is moved back into the released state, in particular by means of the actuator unit 6 and / or by manual actuation, and the tool 1 is again driven by the drive unit 5. A workpiece 11 or another workpiece is then machined by means of this tool 1. Expediently, no change of the tool 1 and / or the brake body 3 takes place between braking of the tool 1 and / or the shaft 2 and further machining.

[0125] According to an advantageous embodiment, the tool device 10 is configured to move the brake body 3 back into the released state, in particular by means of the actuator unit 6 and / or further actuator units (not shown in the figures). Advantageously, the tool 10 is designed to move the brakes 3 back into the released state upon a reset command, which is expediently entered by a user into the tool 10, for example via an input device, in particular a push button.

[0126] Alternatively or additionally, the tool device 10 is configured in such a way that the brake body 3 can be moved back to the released state via manual operation of the tool 1 and / or the shaft 2 and / or an operating element, e.g. a lever, mechanically connected to this shaft 2. In addition, the present application relates to the invention described in the claims, but may also include the following as other aspects. 1. A tool device (10) having a drivable tool (1), the tool device comprising: The tool (1) includes a shaft (2) connected to the tool (1) and further includes at least one brake body (3), The tool device (10) is configured to move at least one of the brake bodies (3) from a released state to a braked state within a braking process, In this braking state, at least one of the brake bodies (3) is in contact with a shaft and thus a braking force acts on this shaft (2), thus braking this shaft (2) and thus also the tool (1); and In this released state, at least one of the brake bodies (3) is not in contact with the shaft (2). A tool device (10) characterized in that 2. The tool device (10) is provided with a plurality of braking bodies (3), These damping bodies are distributed around the shaft (2) in a circumferential direction (4), The tool device (10) is configured to move the plurality of braking bodies (3) from the released state to the braking state within the braking process range, In this braking state, the braking bodies (3) are in contact with the shaft and thus a braking force acts on this shaft (2), thus braking this shaft (2) and thus also the tool (1); and The tool device (10) described in the above item 1, characterized in that in this released state, the multiple braking bodies (3) are not in contact with the shaft (2). 3. The tool device (10) is configured to move one or more of the braking bodies (3) from the released state to the braking state by pivoting; 3. The tool device (10) according to claim 1 or 2. 4. The tool device (10) is configured to move one or more of the braking bodies (3) from the release state to the entrained state and from the entrained state to the braking state within the braking process, the brake body or bodies (3) are entrained in this entrained state by the movement of the shaft (2), so that the movement of the brake body or bodies (3) into the braking state is assisted by the movement of the shaft (2), 4. The tool device (10) according to any one of claims 1 to 3. 5. The one or more braking bodies (3) each have a first contact portion (17) having a slope-shaped first contact contour (18); This contact contour is in contact with the shaft (2) in the braking state, 5. The tool device (10) according to any one of claims 1 to 4. 6. The tool device (10) according to any one of 1 to 5 above, further comprising a braking portion (14), the braking portion surrounding the shaft (2). 7. The tool device (10) described in item 5 above, characterized in that, in the braking state, one or more of the braking bodies (3) are sandwiched between the braking portion (14) and the shaft (2). 8. The tool device (10) is - comprising an actuating part (16) which is in and / or can be in contact with said braking body or bodies (3), and configured to perform an actuation movement by means of said actuating part (16) to cause one or more of said brake bodies (3) to be moved from said release state to said braked state, 8. The tool device (10) according to any one of claims 1 to 7. 9. The tool device (10) is configured to detect a dangerous state and to initiate the braking process on the basis of the detected dangerous state. 9. A tool device (10) according to any one of claims 1 to 8. 10. The tool device (10) is configured to detect contact between the tool (1) and a human body as the dangerous condition. 10. The tool device (10) according to claim 9, 11. The tool device (10) is configured to detect kickback as the dangerous condition. 11. The tool device (10) according to claim 9 or 10. 12. The tool device (10) is designed in such a way that, when the braking process is carried out, the tool (1) comes to a stop in 10 ms or less, expediently in 5 ms or less. 12. A tool device (10) according to any one of claims 1 to 11. 13. The tool device (10) is configured to move one or more of the brake bodies (3) from the braked state back to the released state. 13. A tool device (10) as described in any one of 1 to 12 above. 14. The tool device (10) is adapted such that the brake body or bodies (3) are actuated, in particular by manual actuation of the tool (1), the shaft (2) and / or an actuating element connected to this shaft (2), configured to be moved from said braked state back to said released state; 14. The tool device (10) according to any one of claims 1 to 13. 15. A method for braking a tool (1) connected to a shaft (2), the method comprising the steps of: moving one or more brake bodies (3) from a released state in which the one or more brake bodies (3) are not in contact with the shaft (2) to a braked state in which the one or more brake bodies (3) are in contact with the shaft (2); and, as a result, a braking force acts on the shaft (2), Thus, the shaft (2) and the tool (1) are braked. A method comprising the steps of: 16. The method according to claim 15, characterized in that the method is carried out by a tool device (10) according to any one of claims 1 to 14.

Claims

1. A tool device (10) having a drivable tool (1), the tool device comprising: The tool (1) comprises a shaft (2) connected to the tool (1) and further comprises a number of braking bodies (3) distributed around the shaft (2) in a circumferential direction (4), The tool device (10) is configured to move the brake bodies (3) from a released state to a braked state within a braking process range, In this braking state, the braking bodies (3) are in contact with the shaft and thus a braking force acts on this shaft (2), thus braking this shaft (2) and thus also the tool (1); and In the tool device, in this released state, the braking bodies (3) are not in contact with the shaft (2), The tool device is configured to move the braking bodies (3) from the release state to the entrained state and from the entrained state to the braking state within the braking process, the braking bodies (3) are entrained in this entrained state by the movement of the shaft (2), and thus the movement of the braking bodies (3) into the braking state is assisted by the movement of the shaft (2); and The tool device (10) a brake means for braking a vehicle comprising: an actuating portion (16) which is in contact with and / or can be in contact with a plurality of said braking bodies (3); a plurality of said brake bodies (3) are configured to perform an actuating movement by means of said actuating part (16) in order to cause said brake bodies (3) to be moved from said release state to said braked state, and said actuating movement of said actuating part (16) is performed by an actuator unit (6); A tool device (10) comprising:

2. The tool device (10) is configured to move the braking bodies (3) from the released state to the braking state by pivoting. Tool device (10) according to claim 1 .

3. Each of the braking bodies (3) has a first contact portion (17) having a first contact contour (18) having a sloped shape; This contact contour is in contact with the shaft (2) in the braking state, Tool device (10) according to claim 1 or 2.

4. The tool device (10) according to any one of claims 1 to 3, further comprising a braking part (14) surrounding the shaft (2).

5. 5. The tool device (10) according to claim 4, characterized in that the braking bodies (3) are sandwiched between the braking portion (14) and the shaft (2) in the braking state.

6. the tool device (10) is configured to detect a dangerous situation and to initiate the braking process on the basis of the detected dangerous situation. Tool device (10) according to any one of the preceding claims.

7. the tool device (10) is configured to detect contact between the tool (1) and a human body as the dangerous condition, Tool device (10) according to claim 6.

8. The tool device (10) is configured to detect kickback as the dangerous condition. Tool device (10) according to claim 6 or 7.

9. the tool device (10) is designed in such a way that, when the braking process is carried out, the tool (1) comes to a stop within 10 ms or less, expediently within 5 ms or less; Tool device (10) according to any one of the preceding claims.

10. The tool device (10) is configured to move the brake bodies (3) from the braked state back to the released state. Tool device (10) according to any one of the preceding claims.

11. The tool device (10) is arranged such that the braking bodies (3) are actuated, in particular by manual actuation of the tool (1), the shaft (2) and / or an actuating element connected to said shaft (2), configured to be moved from said braked state back to said released state; Tool device (10) according to any one of the preceding claims.

12. A method for braking a tool (1) connected to a shaft (2), which is carried out by a tool device (10) according to any one of claims 1 to 11, said method comprising the following steps: a plurality of braking bodies (3) arranged in a circumferential direction (4) and distributed around the shaft (2) move from a release state to an entrained state and from the entrained state to a braking state, It has steps, In the released state, the braking bodies (3) are not in contact with the shaft, and in the braking state, the braking bodies (3) are in contact with the shaft (2); and This causes a braking force to act on the shaft (2), Thus, the shaft (2) and the tool (1) are braked, and In this entrained state, the braking bodies (3) are entrained by the movement of the shaft (2), and thus the movement of the braking bodies (3) into the braking state is assisted by the movement of the shaft (2). A method comprising:

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