Chuck with electrical line connection via a slip ring

Abstract

The invention relates to a chuck (1) having clamping elements (2) for holding a workpiece, in particular radially movable clamping jaws (3) having at least one electrical component (5), such as an electrical controller (4) and / or an electric motor (6), wherein the chuck (1) can be mounted on a rotatable holder and a transmission of electrical control signals and / or electric power takes place via at least one slip ring (27) interacting with a brush contact (30), with both the slip ring (27) and the brush contact (30) being part of the chuck (1), wherein a support element (24) is rotatably mounted in the chuck (1) itself and either the slip ring (27) or the brush element (30) is attached to the support element (24).

Description

[0001] P20336-EFM

[0002] 09.03.2026 - Ws

[0003] 1

[0004] Description

[0005] Chuck with electrical connection via slip ring

[0006] The invention relates to a chuck, in particular a precision chuck for measuring purposes, according to the preamble of claim 1.

[0007] Chucks are known in the art for use in machine tools, particularly lathes but also milling machines and machining centers, to fix and hold a workpiece during machining. A common embodiment is a chuck resembling a cylinder externally, featuring three or four guided jaws on its end face that are movable concentrically towards the center.

[0008] The chuck can be mounted on a rotatable bearing to allow for workpiece positioning via a rotary motion, for example in a machining center or milling machine. In lathes, the chucks are connected to and mounted on the rotating axis.

[0009] It is further known in the prior art, in order to achieve automated manufacturing or generally to enable faster machining, that the chuck has a clamping device actuated by drives, in particular electric motors. In this case, an electrical connection to the stationary machine part, especially in the case of lathes, must be designed in such a way that free rotation by any number of revolutions is guaranteed and, at the same time, electrical connections for control and power transmission are available.

[0010] It is known in the prior art to use slip rings as electrical connections for this purpose. In this process, slip rings are typically arranged radially on the rotating chuck, and these rings interact with grinders attached to a stationary holder connected to the machine tool.

[0011] From DE 1 287904 B, an electrically operated chuck for lathes or the like for clamping workpieces is known, in which a holder is attached to P20336-EFM

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[0014] a bearing housing for the support of a chuck or main shaft of a lathe and grinders attached to the holder interact with slip rings on the chuck.

[0015] Chucks with the same basic design, but manufactured with much greater precision and designed for lower clamping forces, are used as precision chucks in measuring devices. For example, a manufactured bevel gear for a differential can be clamped in such a precision chuck on a measuring table and checked for compliance with dimensional specifications. For this purpose, after clamping, the precision chuck, which is rotatably mounted, is rotated into a defined measuring position, and the workpiece, in this case the bevel gear, is measured with probes.

[0016] Increasingly, and with rising demands on manufacturing accuracy, there is a desire to inspect very large samples or even all workpieces. Robots are often used for this purpose, inserting the workpieces into the chuck, which is equipped with electrically driven jaws. Even if the force transmission from the electric motors to the jaws can be lower than in manufacturing, it is desirable that the entire chuck can be inserted into a rotatable, preferably machine-rotatable, fixture for positioning.

[0017] The known prior art design consisting of slip rings and wipers with a holder has the disadvantage that the holder requires a connection to a stationary part of the measuring device. Furthermore, a more compact design is desirable. This leaves more room for movement on the measuring device, for example, for robot arms used to position the test workpieces.

[0018] Often, the measuring device already provides an interface that can be positioned by a rotary drive, so there is no convenient mounting position for a holder with grinders.

[0019] The present invention is therefore based on the objective of providing a chuck, in particular a precision chuck for measuring purposes, which the P20336-EFM

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[0022] This avoids the aforementioned disadvantages and allows it to be arranged as a compact unit, particularly on a rotatable interface of the measuring device.

[0023] This problem is solved by a chuck according to the features of independent claim 1. Advantageous embodiments of the invention are specified in the dependent claims.

[0024] The object of the invention is achieved in that, in a chuck with clamping elements for holding a workpiece, in particular radially movable clamping jaws, with at least one electrical component, such as an electrical control and / or an electric motor, wherein the chuck can be mounted on a rotatable mount and electrical control signals and / or electrical power are transmitted via at least one slip ring cooperating with a wiper, both the slip ring and the wiper are part of the chuck, wherein a support element is rotatably mounted in the chuck itself and either the slip ring or the wiper is attached to the support element.

[0025] Typically, several slip rings and wipers are used to transmit supply voltage, ground, and one or more control signal lines. Because the support element is fully mounted within the chuck itself and can rotate within it, there is no need for an additional mounting point for a wiper holder on the measuring device. This saves installation space and results in a greater range of motion, for example, for robot arms in streamlined manufacturing. The resulting compactness is also advantageous for the measuring device because the distances between mounting points, such as those for the probes, the chuck, and a workpiece position can be reduced.

[0026] During operation, the chuck can be mounted on a rotatable mount, with the clamping elements holding a workpiece.

[0027] The support element is advantageously braced against twisting by a connecting cable and / or an outwardly extending drive element. P20336-EFM

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[0030] Since the torques acting on the support element are relatively small, a small drive element can absorb them. The drive element can be fixed, for example, with a single pin or screw against a bore or receptacle in the measuring device.

[0031] The connecting cable can be stiffened by a protective sheath, e.g. a polyurethane sheath.

[0032] Since the torque exerted on the support element by the driving forces is relatively low, it is conceivable to support it using the connecting cable itself, provided the cable is stiffened by a covering. This could be a standard plastic sheath or, for example, a heat-shrink tube.

[0033] The support element can be rotated 360° and multiple times around its axis.

[0034] As a rule, the supporting element is designed in such a way that any number of rotations are possible.

[0035] This allows for continuous or repeated rotation without limitations caused by cable twisting or mechanical stops. This increases flexibility in positioning and alignment during operation.

[0036] The supporting element can be formed from a ring or a ring segment.

[0037] It is also conceivable that only a movement in a sub-segment is provided, for example if a segment of a ring can be rotated over an angular range on a partial circular path.

[0038] The ring-shaped design facilitates the attachment of the slip ring to the support element and enables precise guidance within the chuck.

[0039] This increases the reliability of the electrical contact and simplifies assembly.

[0040] Advantageously, the ring or ring segment includes a suitably shaped circuit board with at least one wiper or slip ring. P20336-EFM

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[0043] Slip rings in the form of circular conductor tracks can easily be created on such a circuit board. Likewise, such a circular circuit board can be arranged parallel to the slip ring as a slip ring carrier and mating element. Slip rings can then be easily attached to such a circuit board, for example, by soldering.

[0044] In another embodiment, the support element can consist of a cylinder that is mounted in a hollow cylinder housing.

[0045] This results in a very compact element that can be inserted into a bore or recess of the pivot axis in the chuck during the rotatable mounting of the chuck. Any type of bearing arrangement for the support element within the lifting cylinder housing is conceivable, where the support element is supported like a shaft at both ends, or only on one side of the housing.

[0046] In an advantageous embodiment, the support element in the chuck is mounted via a rolling bearing, in particular an angular contact ball bearing.

[0047] This results in lower torsional resistance, and the support provided by the connecting cable and / or a drive mechanism only needs to absorb less force. More reliable operation can also be ensured.

[0048] The slip rings can be arranged on the support element.

[0049] The slip rings can be designed as ring-shaped, electrically conductive elements that are attached to a surface of the support element or integrated into it. The slip rings can be arranged axially or radially on the support element, with the exact orientation depending on the geometry of the chuck.

[0050] The support element can be made of an electrically insulating or conductive material, for example, plastic, ceramic, or metal, with an additional insulating layer possible between the slip ring and the support element. The slip rings can be attached to the support element by positive locking, friction locking, or adhesive bonding. The slip rings can have multiple insulated P20336-EFM

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[0053] Conductive tracks are used to transmit different electrical signals or power separately.

[0054] It is advantageous for several grinders to work together, each with a slip ring.

[0055] This allows for a symmetrical load distribution, for example, when multiple wipers are arranged diagonally opposite each other on a ring or cylinder. The reliability of the electrical contact can also be increased by the multiple contacts.

[0056] In another embodiment, the grinders themselves can be designed with spring-loaded blades angled downwards in two opposite directions, with grinding points arranged at their ends. This results in identical operating behavior in both directions of movement.

[0057] The radially movable clamping jaws can be clamped by means of a rotatable spiral groove disc, wherein the spiral groove disc is connected to a hollow gear and a motor unit, which can be used as a unit and is arranged in a fixed position in the chuck, is arranged with a drive gear oriented radially outside and inside the toothing of the hollow gear parallel to an axis of the hollow gear, so that the drive gear can rotate it.

[0058] This embodiment with a drive gear can be used completely independently of the features described above, particularly even when no grinders or slip rings are used. This embodiment, as formulated in claim 11, can therefore be used completely independently of the embodiments of claims 1 to 10. When a chuck is used as a precision chuck, clamping forces as high as those required for machining are not necessary. Conversely, rapid clamping with high precision should be possible. The single-stage reduction with a large hollow gear and an engaging drive gear enables rapid movement of the jaws with sufficient clamping force and high precision. A motor unit is used as a separate component, which can be used or mounted as such, and which rotates the drive gear. This motor unit is P20336-EFM.

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[0061] It may have an additional internal reduction gear, for example if a very fast-rotating electric motor is used.

[0062] Further advantages and details of the invention are explained in more detail with reference to the exemplary embodiments shown in the schematic figures. Here,

[0063] Fig. 1 shows a cross-sectional embodiment of a chuck according to the invention.

[0064] Fig. 2 shows the chuck of Fig. 1 in perspective view,

[0065] Fig. 3 shows detail III of Fig. 1 ,

[0066] Fig. 4 shows detail III of Fig. 1 for an embodiment with angular contact ball bearing of the support element or support ring,

[0067] Fig. 5a Slip rings on the support element with ring-shaped circuit board in top view,

[0068] Fig. 5b shows an annular plate of the chuck with sliders, associated with the support element.

[0069] Fig. 6 shows a further embodiment of a chuck according to the invention in section,

[0070] Fig. 7 shows a perspective view of the chuck shown in Fig. 6 and

[0071] Fig. 8 shows a highly schematic representation of the cylindrical support element of the embodiment shown in Fig. 6.

[0072] Fig. 1 shows a cross-sectional example of an embodiment of a chuck according to the invention.

[0073] The chuck 1 comprises several clamping elements 2 arranged in a base body 7, which are designed as clamping jaws 3 and are configured for this purpose, P20336-EFM

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[0076] to hold a workpiece radially. A control unit 4 is shown, which is designed as an electrical component 5 and is configured to regulate and monitor the clamping process. An electric motor 6, as an electrical component 5, is connected via a motor flange 9 to a housing 8, which encloses the internal components and protects them from external influences.

[0077] A pinion 10 is configured to transmit the rotary motion of the electric motor 6 to a ring gear 13. The ring gear 13 has a ring gear toothing 14 that interacts with the pinion 10. A spiral grooved disc 12 is connected to the ring gear 13 and comprises a spiral toothing 15, which serves to convert the rotary motion into a radial motion of the clamping jaws 3. Since only relatively low clamping forces are required when clamping a workpiece for measuring purposes compared to machining, it is not necessary in the example shown here to provide a multi-stage reduction gear, although this would of course still be possible.

[0078] A base plate 11 as part of the housing 8 forms the base of the chuck 1 and serves to mount the device on, for example, a rotatable support on a measuring system.

[0079] An LED foil 16 and an LED ring 17 are shown, the LED ring 17 serving as an optical status indicator for the chuck 1.

[0080] A driver 18 is also shown, which serves as a connecting element for transmitting rotary movements. The connecting cable 19 is designed to transmit electrical energy and control signals and is surrounded by a protective sheath 20, designed as a polyurethane sheath 21, to ensure mechanical stability. A slip ring assembly 22 with slip rings (not visible in section) is shown, which, together with the wiper carrier 23, enables the transmission of electrical power and control signals between stationary and rotating components.

[0081] During operation, the transmission of electrical energy and control signals takes place via the slip rings of the slip ring body 22 and the wiper carrier 23 as well as wipers not shown here, wherein a support element for the slip ring body 22 is rotatable in the P20336-EFM

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[0084] Chuck 1 is mounted.

[0085] The control unit 4 regulates the electric motor 6, which drives the ring gear 13 and the spiral groove disc 12 via the pinion 10, thereby moving the clamping jaws 3 radially. The LED ring 17 visually indicates the operating status of the chuck 1. The connecting cable 19, reinforced by the protective sheath 20 and the polyurethane sleeve 21, ensures a secure electrical connection.

[0086] Alternatively, the support element can be designed as a ring, ring segment, or cylinder, with mounting, for example, via a rolling bearing. The slip rings can be arranged at different positions on the support element, and multiple wipers, each with a slip ring, can interact. The arrangement of the LED film and the LED ring can vary, as can the design of the connecting cable.

[0087] Fig. 2 shows the chuck of Fig. 1 in perspective view.

[0088] The chuck 1 comprises a housing 8 on which several clamping elements 2 or clamping jaws 3 are arranged. The clamping jaws 3 are radially movable so that they can center and fix the workpiece.

[0089] A driver 18 is shown on one side of the housing 8 and projects outwards. The driver 18 is designed to receive a connecting cable 19, which serves to transmit electrical energy or control signals. The connecting cable 19 is surrounded by a protective sheath 20, which is a polyurethane sheath 21, to mechanically stiffen the cable and protect it from external influences.

[0090] The clamping jaws 3 are designed to be radially moved by an internally arranged spiral groove disc, which is not visible. The electrical components inside the chuck 1 are connected via the connecting cable 19, which is routed to the outside through the driver 18. The housing 8 has several mounting holes for mounting the chuck 1 on a rotatable fixture. P20336-EFM

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[0093] Alternatively, the protective cover 20 can be made of other suitable materials. The number and arrangement of the clamping elements 2 and clamping jaws 3 can vary, as can the design of the driver 18 and the connecting cable 19. The housing 8 can be designed in different geometric shapes to be adapted to various rotatable mounts.

[0094] Fig. 3 shows detail III of Fig. 1.

[0095] The figure shows a section through an area of ​​the chuck, in particular showing the bearing and guidance of the support element 24 and the arrangement of the electrical component 5 in connection with the slip ring 27.

[0096] The chuck shown in Fig. 3 comprises the housing 8, which serves as a protective and supporting structure for the other components. Inside the housing 8 is the electrical component 5, which here corresponds to the electric motor 6. The electric motor 6 is configured to drive the clamping elements of the chuck, in particular the jaws. The housing 8 also includes a base plate 11, which serves as a base for mounting the chuck on a rotatable fixture, e.g., a measuring device.

[0097] A driver 18 is shown, which is designed to hold the support element 24 in position during a rotational movement of the chuck. The support element 24 is rotatably mounted in a groove-shaped guide 25 and carries the slip ring body 22 with the slip rings, which are not visible in this section. The slip ring body 22 is designed to transmit electrical control signals and / or electrical power via a cooperating wiper, which is not shown here. A wiper carrier 23 is shown, which holds the wipers and is rigidly connected to the chuck 1.

[0098] Furthermore, a protective sheath 20 is shown, which surrounds a connecting cable and protects it from mechanical and environmental influences. The protective sheath 20 comprises a polyurethane sheath 21, which is designed as a flexible and insulating casing. P20336-EFM

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[0101] The interaction of the elements shown ensures that the support element 24, with the slip ring body 22 and the slip rings arranged on it, is rotatably mounted within the housing 8. The electrical connection to the electric motor 6 is made via the slip rings and the associated wipers, with the driver 18 holding the support element 24 in its position when the chuck 1 is rotated and the guide 25 enabling a precise rotary movement.

[0102] Fig. 4 shows detail III of Fig. 1 for an embodiment with angular contact ball bearing of the support element 24 or a support ring.

[0103] Components functionally corresponding to those of the previous embodiment as well as the following further embodiment are provided with the same reference numerals. The housing 8 encompasses the electrical and mechanical components of the chuck and is designed to shield the components from external influences. The base plate 11 of the housing 8 forms a base on which the chuck can be mounted on a rotatable receptacle. The electrical component 5, in the form of an electric motor 6, is arranged within the housing 8 and is configured to electrically drive the clamping elements, in particular the clamping jaws.

[0104] The driver 18 is designed to hold the support element 24 in position during a rotational movement of the chuck. The slip ring body 22, with slip rings not visible in this section, is arranged on the support element 24 and is configured to transmit electrical signals or power to the chuck via the slip rings and wipers (not shown) and a wiper carrier 23.

[0105] The protective sheath 20 and the polyurethane sheath 21 surround the connecting cable and protect it from mechanical and environmental influences. The guide 25, in the form of a circumferential groove, serves to rotatably support the support element 24 in the housing 8. An angular contact ball bearing 26 is arranged between the support element 24 and the housing 8 and enables low-friction and precise rotation of the support element 24. P20336-EFM

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[0108] The guide 25 ensures the axial and radial positioning of the support element 24. The angular contact ball bearing 26 reduces friction during the rotational movement of the support element 24 and enables precise rotation, thereby reducing the forces acting on the driver 18. The protective sleeve 20 and the polyurethane sheath 21 stiffen and further protect the connecting cable.

[0109] In operation, the arrangement allows the support element 24, with the attached slip ring body 22, to be rotatably mounted, and electrical signals or power to be transmitted via the slip ring carrier 23 to the chuck. The angular contact ball bearing 26 ensures low-friction and jam-free movement of the support element 24 in the guide 25. The protective sleeve 20 and the polyurethane sheath 21 ensure a secure and durable electrical connection by mechanically stiffening the connecting cable and protecting it from external influences. The driver 18 holds the support element 24 in the desired position and prevents unintentional rotation.

[0110] Alternatively, the support element 24 can also be designed as a cylinder mounted in a hollow cylinder housing, as shown in further figures. The mounting can be achieved using an angular contact ball bearing or other rolling bearings. Furthermore, it is possible to provide multiple slip ring bodies 22 and slip ring carriers 23 to transmit a larger number of electrical signals or more power.

[0111] Fig. 5a shows the slip ring body 22 as an annular plate 28 on the support element covered here in top view.

[0112] The support element is designed as a ring-shaped component and comprises a circuit board 28 arranged on its upper surface. The circuit board 28 is ring-shaped and has several concentrically arranged slip rings 27. The slip rings 27 are designed as electrically conductive areas or non-insulated conductor tracks on the circuit board 28 and extend circularly around the central axis of the support element with the driver 18. The slip rings 27 are configured to interact with wipers (not shown) to enable electrical transmission.

[0113] The slip rings 27 are electrically isolated from each other and run parallel to each other. The arrangement of the slip rings 27 on the circuit board 28 enables a P20336-EFM

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[0116] Multiple transmission of electrical power and / or control signals via several separate channels.

[0117] The slip rings 27 enable a continuous electrical connection between an external power or signal source and the electrical components arranged in the chuck, such as an electric motor or a controller. The ring-shaped design of the circuit board 28 and the slip rings 27 ensures that the electrical transmission is maintained regardless of the rotational position of the support element 24.

[0118] Alternatively, the support element 24 can also be designed as a ring segment, with the circuit board 28 adapted accordingly. The number and arrangement of the slip rings 27 can vary to meet different requirements for signal or power transmission. The circuit board 28 can be made of various insulating substrate materials, and the slip rings 27 can be applied using different manufacturing processes, such as printed circuit board manufacturing or film technology.

[0119] Fig. 5b shows a slider carrier 23 with sliders 30 associated with the support ring or the slip ring body in top view.

[0120] A wiper board 29 is designed as a ring-shaped element, forms the wiper carrier 23 and comprises several conductor tracks 31, which are arranged concentrically on the wiper board 29. The wipers 30 are mounted on the wiper board 29 and electrically connected to the conductor tracks.

[0121] The conductive traces 31 are applied to the top surface of the wiper board 29 and run in a circle around the center of the assembly. The arrangement of the conductive traces 31 allows for multiple contacts by several wipers 30.

[0122] The wipers 30 are arranged such that, during a rotational movement of the support ring 23, they maintain continuous contact with the slip rings 27 of the associated support element and the circuit board 28 in Fig. 5a via a spring-loaded section. This ensures uninterrupted transmission of electrical power and / or the control signals P20336-EFM

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[0125] made possible.

[0126] Fig. 6 shows a further embodiment of a chuck according to the invention in section.

[0127] The chuck 1 comprises a housing 8, which is composed of a lower housing part 8,32, a middle housing part 8,33 and a upper housing part 8,34. Inside the housing 8 is an electrical component 5, which is designed as an electric motor 6 and is configured to move the clamping jaws.

[0128] Furthermore, a wiper-slip ring unit 35 is shown, which is configured to establish an electrical connection between a rotatable chuck and, for example, a stationary measuring device. The wiper-slip ring unit 35 is arranged in the lower region of the housing 8 and comprises at least one slip ring and an associated wiper. A driver 18 holds a support element in place during rotation of the chuck 1. A connecting cable 19 is shown, which is configured to transmit electrical energy or control signals. In the present embodiment, the wiper-slip ring unit 35 is arranged concentrically in an axis of rotation of the chuck 1.

[0129] The chuck 1 is designed to be mounted on a rotatable mount and to enable the transmission of electrical control signals and / or electrical power via at least one slip ring interacting with a grinder.

[0130] Fig. 7 shows a perspective view of the chuck 1 of Fig. 6. The chuck 1 comprises a housing 8 and several clamping elements 2, in particular clamping jaws 3, are arranged on its upper surface, which are designed to hold a workpiece. A driver 18 is designed to hold the support element during rotation of the chuck 1 and simultaneously accommodate a connecting cable 19 for transmitting electrical energy or control signals.

[0131] Fig. 8 shows, in a highly schematic way, the cylindrical support element of the embodiment shown in Fig. 6.P20336-EFM

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[0133] 15

[0134] The slip ring assembly is arranged in the housing 8 and comprises slip rings 27 and associated wipers 30. The slip rings 27 are arranged on a cylindrical support element 24, which is mounted in a hollow cylindrical housing 37. The connecting leads 38 connect the wipers 30 to electrical components, such as an electric motor or a controller.

[0135] Fig. 8 shows, in a highly schematic way, the support element designed as a cylinder in the embodiment of Fig. 6.

[0136] In Fig. 8, the support element 24 is designed as a cylinder 36, which is received in a hollow cylinder housing 37 and simultaneously serves as a slip ring carrier 23. Several slip rings 27 are arranged concentrically on the cylinder 36. The slip rings 30 are radially aligned and each interacts with a slip ring 27 to establish an electrical connection between connecting leads 38 for the electric motor and other electrical components and the slip rings 27.

[0137] The driver 18 and the connecting cable 19 are arranged at one end of the support element 24 and serve for the mechanical and electrical connection to the outside.

[0138] The interaction of the elements shown enables the transmission of electrical energy and / or control signals from a stationary connection line 19 via the slip rings 27 and wipers 30 to the rotatable chuck 1. The support element 24 is designed to rotate within the hollow cylinder housing 37, with the slip rings 27 and wipers 30 ensuring a continuous electrical connection. The wiper-slip ring assembly 35 is designed as a modular unit, allowing for easy assembly and maintenance. The arrangement is designed to allow continuous rotation of the chuck 1 without interrupting the electrical connection.

[0139] Alternatively, the support element 24 can also be designed as a ring or ring segment, with the slip rings 27 and wipers 30 arranged accordingly. The support element 24 can be mounted on a rolling bearing, in particular an angular contact ball bearing. The number of slip rings 27 and wipers 30 can be specified in P20336-EFM.

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[0142] The dimensions can be varied to meet different electrical transmission requirements. The connecting cable 19 can be stiffened by a protective sheath, for example a polyurethane sheath, to ensure additional mechanical stability. P20336-EFM

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[0145] List of reference signs

[0146] 1 chuck

[0147] 2 clamping elements

[0148] 3 clamping jaws

[0149] 4 Control

[0150] 5 electrical components

[0151] 6 electric motor

[0152] 7 Basic shapes

[0153] 8 cases

[0154] 9 Motor flange

[0155] 10 sprockets

[0156] 11 Base plate

[0157] 12 spiral groove disc

[0158] 13 Ring gear

[0159] 14 Ring gear teeth

[0160] 15 spiral teeth

[0161] 16 LED film

[0162] 17 LED ring

[0163] 18 drivers

[0164] 19 Connection line

[0165] 20 protective cases

[0166] 21 Polyurethane shell

[0167] 22 slip ring bodies

[0168] 23 slider carriers

[0169] 24 Supporting element

[0170] 25 Leadership

[0171] 26 angular contact ball bearings

[0172] 27 Slip ring

[0173] 28 circuit boards

[0174] 29 wiper board

Claims

P20336-EFM 09.03.2026 - Ws 18 Patent claims 1. Chuck (1) with clamping elements (2) for holding a workpiece, in particular radially movable clamping jaws (3), with at least one electrical component (5), such as an electrical control (4) and / or an electric motor (6), wherein the chuck (1) can be mounted on a rotatable mount and electrical control signals and / or electrical power are transmitted via at least one slip ring (27) cooperating with a grinder (30), characterized by that both the slip ring (27) and the grinder (30) are part of the chuck (1), wherein a support element (24) is rotatably mounted in the chuck (1) itself and either the slip ring (27) or the grinder (30) is attached to the support element (24).

2. Chuck (1) according to claim 1 , characterized by that the support element (24) is supported against twisting by a connecting line (19) and / or an outwardly directed driver (18).

3. Chuck (1) according to claim 2, characterized by that the connecting cable (19) is stiffened by a protective sheath (20), e.g. a polyurethane sheath (21).

4. Chuck (1) according to one of the preceding claims, characterized by that the support element (24) can be rotated 360° and multiple times around its axis.

5. Chuck (1) according to one of the preceding claims, characterized by that the supporting element (24) is formed from a ring (17) or a ring segment. P20336-EFM 09.03.2026 - Ws 19 6. Chuck (1) according to claim 5, characterized by that the ring (17) or ring segment comprises a suitably shaped plate (28) with the at least one wiper (30) or the at least one slip ring (27).

7. Chuck (1) according to one of claims 1 to 4, characterized by that the support element (24) consists of a cylinder (36) which is mounted in a hollow cylinder housing.

8. Chuck (1) according to one of the preceding claims, characterized by that the support element (24) is mounted in the chuck (1) via a rolling bearing, in particular an angular contact ball bearing (26).

9. Chuck (1) according to one of the preceding claims, characterized by that at least one slip ring (27) is arranged on the support element (24).

10. Chuck (1) according to one of the preceding claims, characterized by that a plurality of grinders (30) interact with each of a slip ring (27).

11. Chuck (1) according to one of the preceding claims, characterized by that the radially movable clamping jaws (3) can be clamped by means of a rotatable spiral groove disc, wherein the spiral groove disc (12) is connected to a hollow gear and a motor unit which can be used as a unit and is arranged in a fixed position in the chuck (1) with a drive gear is arranged radially outside parallel to an axis of the hollow gear, so that the drive gear engages in the hollow gear and can rotate it.

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