Machine tool with pivotable centring sensor

Abstract

A machine tool for machining workpieces (23) with precut teeth comprises a tool carrier (12), on which a tool spindle (15) for rotationally driving a machining tool (16) about a tool spindle axis (B) is arranged, a workpiece carrier (20), on which a workpiece spindle (21) for rotationally driving a workpiece (23) with precut teeth to be machined about a workpiece spindle axis (C1) is arranged, a first contactlessly operating centring sensor (31) which is designed to determine a phase position of teeth of the workpiece (23) when the workpiece rotates about the workpiece spindle axis (B), and a pivoting device, wherein the pivoting device comprises a pivotable sensor carrier (40), to which the first centring sensor (31) is attached, in order to pivot the first centring sensor between a measuring position and a parked position, wherein the pivoting device is arranged on the tool carrier (12), and wherein the pivoting device is designed to pivot the first centring sensor about the tool spindle axis (B).

Description

[0001] TITLE

[0002] MACHINE TOOL WITH SWIVELLING CENTERING SENSOR

[0003] TECHNICAL FIELD

[0004] The present invention relates to a machine tool for machining pre-toothed workpieces, which comprises a centering sensor and a pivoting device for pivoting the centering sensor.

[0005] STATE OF THE ART

[0006] When fine-machining pre-toothed workpieces, the tool and the workpiece to be machined must be aligned before each machining operation so that the tool can plunge into the tooth gap of the workpiece without collision. This procedure is known in the industry as "centering."

[0007] Such centering is particularly necessary for continuously operating generating machining processes. In such processes, the workpiece to be machined is brought into engagement with a worm-shaped tool and machined in rolling coupling with the tool. In modern, NC-controlled gear cutting machines, the workpiece is clamped on an NC-controlled, rotary-driven workpiece spindle. The tool is clamped on a tool spindle, also NC-controlled and rotary-driven. The rolling coupling between the tool spindle and workpiece spindle is then established electronically by the NC control. Even for processes other than generating machining, e.g., profile grinding, precise knowledge of the position of the tooth gaps on the workpiece to be machined is required.

[0008] Typically, non-contact centering sensors are used for centering. These operate on an inductive or capacitive basis and determine the position of the tooth flanks while the workpiece rotates. The rolling coupling angle is determined electronically based on this non-contact measurement. Other tests can also be performed based on the phase position of the signals from all teeth throughout a workpiece rotation. For example, a check for pre-machining errors and radial runout deviations can be performed, a pitch measurement can be performed to determine the tooth pitch, and an estimate of the existing allowance can be made based on the tooth gap width. Furthermore, the helix direction can be determined using the machine axes and / or the helix angle can be measured on the workpiece.

[0009] Typically, the centering sensor is placed in a measuring position close to the workpiece to measure the position of the tooth flanks. During subsequent machining of the workpiece with a machining tool, however, the centering sensor should be protected as much as possible from collisions and contamination.

[0010] It is therefore known to move the centering sensor back and forth between a measuring position and a parking position by means of a movable or pivotable device.

[0011] DE20218352 U1, for example, discloses a device having a measuring probe arranged on a holder designed as a kinematic member of an articulated member parallelogram, in which the member opposite the holder is rigidly connected to the machine stand or the housing of the workpiece spindle.

[0012] DE19928500 A1 discloses a CNC gear grinding machine having a spindle that can be moved parallel to the workpiece axis. The spindle is mounted on the machine bed next to the workpiece spindle and has a spindle axis that runs parallel to the workpiece axis. At the upper end of the spindle is a measuring probe holder that can be pivoted about said spindle axis.

[0013] WO 2017 / 194251 A1 discloses a generating grinding machine in which a centering device can be displaced axially and / or radially to the workpiece axis by means of an adjustment drive arranged on the counter support of the workpiece carrier.

[0014] However, such arrangements, in which the centering device is arranged directly on the workpiece carrier or close to it, can hinder the freedom of movement when clamping / removing the workpiece from the workpiece spindle and, particularly when using automatic workpiece changers, pose a risk of collision.

[0015] PRESENTATION OF THE INVENTION

[0016] It is therefore an object of the present invention to provide a machine tool for machining pre-toothed workpieces with a contactless centering sensor, in which the centering sensor is exposed to low collision risks during workpiece changes and yet an efficient and precise centering operation is enabled.

[0017] The object is achieved by a machine tool having the features of claim 1. Further embodiments are specified in the dependent claims.

[0018] A machine tool for machining pre-toothed workpieces is therefore specified, comprising: a tool carrier on which a tool spindle is arranged for the rotational drive of a machining tool about a tool spindle axis; a workpiece carrier on which a workpiece spindle is arranged for the rotational drive of a pre-toothed workpiece to be machined about a workpiece spindle axis; a first contactless centering sensor which is designed to determine a phase position of teeth of the workpiece when the workpiece rotates about the workpiece spindle axis; and a pivoting device, wherein the pivoting device comprises a pivotable sensor carrier to which the first centering sensor is attached in order to pivot the first centering sensor between a measuring position and a parking position.

[0019] The pivoting device is arranged on the tool carrier and is designed to pivot the first centering sensor about the tool spindle axis.

[0020] By locating the swivel device on the tool carrier, the risk of accidentally damaging the centering sensor when handling the workpiece spindle is reduced. Furthermore, the range of motion around the workpiece spindle is increased compared to arrangements in which the centering device is located on the workpiece carrier, which simplifies the use of an automated workpiece changer, for example. The swivel device's design allows the centering sensor to pivot around the tool spindle axis, enabling a particularly compact arrangement.

[0021] The machine tool can in particular be a generating grinding machine for the continuous generating grinding of the pre-toothed workpieces, wherein the machining tool can in particular be a helically profiled grinding wheel, ie a grinding worm.

[0022] The machine tool can have numerous moving components, such as slides or spindles, which are controlled by corresponding drives. Control is preferably carried out digitally by a computer. These drives are often referred to in the technical world as "NC axes," "machine axes," or simply "axes." This term sometimes also includes the components driven by the drives, such as slides or spindles. In this context, however, the term "axis" is used in a geometric sense and thus includes neither the drives nor the driven components.

[0023] The tool carrier and the workpiece carrier are movable relative to one another. In particular, the tool carrier is preferably displaceable relative to the workpiece carrier in a feed direction perpendicular and in particular radially to the workpiece spindle axis, whereby a radial position of the machining tool and the centering sensor relative to the pre-toothed workpiece can be changed. The machine tool has an axial slide guided on the tool carrier, which is displaceable relative to the workpiece carrier in an axial direction parallel to the workpiece spindle axis, and a shift slide arranged on the axial slide. The tool spindle and the pivoting device are arranged on the shift slide. By displacing the axial slide, an axial position of the machining tool and the centering sensor relative to the pre-toothed workpiece can be changed.The shift slide is movable parallel to the tool spindle axis relative to the workpiece carrier, allowing the tangential position of the machining tool and the centering sensor relative to the pre-toothed workpiece to be changed. The shift slide can also be pivoted about a pivot axis running parallel to the feed direction, allowing the axis intersection angle between the tool spindle axis and the workpiece spindle axis to be changed in order to adapt to the helix angle of the pre-toothed workpiece to be machined. For this purpose, the shift slide can be mounted linearly movable on a pivoting body, which in turn is pivotably mounted on the axial slide.

[0024] A second workpiece spindle can additionally be arranged on the workpiece carrier, wherein the workpiece carrier can be rotatably mounted in order to be able to rotate either the first workpiece spindle or the second workpiece spindle into a machining position, while the machined workpiece can be unloaded or a new workpiece can be clamped on the workpiece spindle that is not in the machining position.

[0025] Because the same slides and drives can be used to position the centering sensor as the ones used to move or pivot the tool spindle with the machining tool clamped on it in the directions mentioned above, there is great flexibility in positioning the centering sensor relative to the workpiece without the need for additional drives. This allows for adaptation to workpieces with different diameters and / or different tooth widths and / or different tooth positions along the workpiece axis, or to workpieces with multiple toothings. The design of the machine tool is also kept compact by using the aforementioned drives and slides.

[0026] Non-contact centering sensors can be based on an inductive, capacitive, or optical measuring principle, for example. The centering sensor defines a sensor axis that corresponds to a measuring direction of the centering sensor. The centering sensor can be designed, in particular, to output a measurement signal, with each centering sensor having a sensor-specific measuring range. If material penetrates the measuring range, the measurement signal changes. Viewed along the sensor axis, the centering sensor can have a maximum measuring distance: Material that is further away than the maximum measuring distance along the sensor axis is not detected by the centering sensor and therefore does not cause any signal change. The measurement signal can be analog or digital.The measurement signal can, in particular, be a binary switching signal that indicates whether material is within the measuring range: If yes, the binary switching signal assumes a first value, preferably a logical one; if no, the binary switching signal assumes a second value, preferably a logical zero. However, the measurement signal can also be a substantially continuous measurement signal, the value of which can be a measure of the distance between the centering sensor and the material or of the amount of material in the measuring range.

[0027] The machine tool can also comprise a second contactless centering sensor configured to determine the phase position of teeth of the workpiece when the workpiece rotates about the workpiece spindle axis. The second centering sensor is also mounted on the sensor carrier. The first centering sensor and the second centering sensor can, in particular, be arranged side by side on the sensor carrier parallel to the tool spindle axis.

[0028] The use of a second centering sensor can be particularly helpful for centering operations on workpieces that have double teeth.

[0029] In particular, the use of a second centering sensor can be useful if the double-toothed workpiece has a first gear with a module that differs from the module of the second gear of the double-toothed workpiece. In this context, the module is defined as the pitch circle diameter of the gear divided by the number of teeth on the gear. To obtain a meaningful measurement, the centering sensor used should have a measuring range that is adapted to the module of the gear to be measured. If the measuring range of the centering sensor is too large compared to the module of the gear, this can lead to an unusable output signal from the centering sensor, since the centering sensor can no longer detect the gear gaps as such (the centering sensor always detects material).However, if the measuring range of the centering sensor is too small compared to the module of the gearing, the output signal of the centering sensor can be distorted because the measuring range does not reach deep enough into the gear gaps and thus unwanted sections of the teeth are detected.

[0030] The first centering sensor preferably has a first measuring range that is specified for a first module range. When the machine tool is in use, the module of the first gear of the double-toothed workpiece should then be located within this first module range.

[0031] If the module of the second toothing of the double-toothed workpiece lies outside this first module range of the first centering sensor, the use of a second centering sensor with a correspondingly larger or smaller second measuring range can be particularly helpful.

[0032] The second centering sensor therefore preferably has a second measuring range specified for a second module range that differs from the first module range. When the machine tool is in use, the module of the second gear of the double-toothed workpiece should then be located within the second module range.

[0033] A centering operation for a double-toothed workpiece can include the following steps:

[0034] Positioning the first centering sensor in a first measuring position for measuring the first gearing with the first centering sensor;

[0035] Determining the phase position of the tooth flanks of the first gear with the first centering sensor;

[0036] Positioning the second centering sensor in a second measuring position for measuring the second gearing with the second centering sensor,

[0037] Determining the phase position of the tooth flanks of the second gearing with the second centering sensor; wherein the shift slide and / or the axial slide are optionally displaced to position the first and / or the second centering sensor;

[0038] Determining a difference angle between a reference tooth flank of the first toothing and a reference tooth flank of the second toothing;

[0039] Determination of the rolling coupling angle for the machining of at least one of the gears of the double-toothed workpiece taking into account the determined differential angle.

[0040] Preferably, the sensor axis is perpendicular to the workpiece spindle axis in the measuring position. Furthermore, the first centering sensor, and optionally also the second centering sensor, are mounted on the sensor carrier in such a way that the sensor axis is perpendicular to the tool spindle axis and preferably intersects it, i.e., runs radially to the tool spindle axis. To move from the measuring position to the parking position and vice versa, the sensor carrier can be pivoted through an angle of between 45° and 150°, preferably between 60° and 120°.

[0041] For even more flexible positioning relative to the workpiece, the first centering sensor and / or, if applicable, the second centering sensor can be mounted on the sensor carrier so that it can be moved parallel to the tool spindle axis.

[0042] The first centering sensor and / or optionally the second centering sensor can be manually displaceable. Alternatively, the sensor carrier can comprise a sensor drive configured to drive the first centering sensor for displacement parallel to the tool spindle axis. The sensor drive can, in particular, comprise a numerically controlled (NC) axis. For example, the sensor drive can comprise an electric motor and a threaded spindle arranged on the sensor carrier. The sensor drive can also be configured to drive the second centering sensor together with the first centering sensor for displacement parallel to the tool spindle axis.

[0043] It is also conceivable that the sensor carrier comprises a further sensor drive of the same type or of a different type than the above-mentioned sensor drive, wherein the further sensor drive only drives the second centering sensor to a displacement parallel to the tool spindle axis, so that the first centering sensor and the second centering sensor can be driven independently of one another to a displacement parallel to the tool spindle axis.

[0044] The advantage of controlled displacement of at least one centering sensor lies in particular in the fact that its position along the tool spindle axis can be controlled and adapted to an area of ​​the machining tool that is currently intended for engagement with the workpiece to be machined. Grinding worms in particular can have differently designed areas along the tool spindle axis for different machining operations such as roughing, finishing or polishing. By changing the axial position of the centering sensor along the tool spindle axis relative to the grinding worm, the travel paths of the grinding worm between centering and the subsequent workpiece machining can be minimized. For example, during the centering operation, the grinding worm can already be in a grinding position with regard to the shift direction, in which position the workpiece is subsequently machined.This means that the centering operation and, if necessary, other measurements carried out with the centering sensor (e.g. pitch or concentricity measurements) can be carried out particularly accurately and with minimal downtime.

[0045] It is also conceivable for the first centering sensor and / or, if applicable, the second centering sensor to be manually or drivenly displaceable tangentially to a pivoting circle defined by the pivoting movement of the respective centering sensor. In particular, if the pivoting device is in an angular position in which the sensor axis of the first and / or second centering sensor is perpendicular to the workpiece axis, an intersection point of the sensor axis with the workpiece axis can be displaced in the axial direction along the workpiece axis independently of the position of the axial slide.

[0046] Additionally or alternatively, the sensor carrier can comprise a joint that defines a joint axis that runs offset from the tool spindle axis. The first centering sensor and / or optionally the second centering sensor can be pivoted about the joint axis, whereby the position of the sensor axis of the first centering sensor and / or optionally the second centering sensor can be adjusted independently of the angular position of the pivoting device. The joint axis can run parallel or perpendicular to the tool spindle axis.

[0047] The pivoting device may comprise a first bearing structure, wherein the sensor carrier is pivotably mounted on the first bearing structure about the tool spindle axis. The bearing structure may, in particular, comprise a rolling bearing device, wherein the rolling bearing device may, for example, comprise an angular contact ball bearing, in particular a pair of angular contact ball bearings, or a crossed roller bearing.

[0048] The machining tool preferably comprises: a proximal tool end and a distal tool end which is axially opposite the proximal tool end along the tool spindle axis, wherein the tool spindle can be designed to drive the machining tool from the proximal tool end.

[0049] The first bearing structure can be arranged proximal to the proximal tool end. The tool spindle can, in particular, have a drive motor for rotationally driving the machining tool, wherein the drive motor preferably drives a tool spindle shaft for rotation about the tool spindle axis.

[0050] The tool spindle may comprise a drive motor housing in which the drive motor is arranged.

[0051] The first bearing structure can be arranged axially along the tool spindle axis between the drive motor and the machining tool. In particular, the first bearing structure can be attached to a tool spindle bearing flange of the tool spindle, wherein the tool spindle bearing flange has an opening for receiving the tool spindle shaft and is preferably rigidly attached to the drive motor housing.

[0052] Alternatively, the first bearing structure can be arranged distally from the distal end of the tool. In such a case, the first bearing structure can, for example, be fixedly attached to the shift carriage.

[0053] In certain embodiments, the sensor carrier can comprise a sensor carrier arm that extends radially from the tool spindle axis, preferably beyond a maximum radius of the machining tool. The sensor carrier can, in particular, have a carrier body that is arranged concentrically to the tool spindle axis and from which the sensor carrier arm extends radially outward. The carrier body and the sensor carrier arm can be made from a single piece or detachably connected to one another. The first centering sensor and, optionally, the second centering sensor can be attached to a freestanding end of the sensor carrier arm.

[0054] In certain embodiments, the sensor carrier can comprise a sensor carrier arm that is "L-shaped," i.e., the sensor carrier arm can comprise a first section that extends radially with respect to the tool spindle axis, preferably beyond a maximum radius of the machining tool, and a second section that adjoins the first section and extends parallel to the tool spindle axis, preferably along the machining tool. The first and / or optionally the second centering sensor can be arranged along the second section of the sensor carrier arm.In an embodiment in which the first bearing structure is arranged distally from the distal tool end, the pivoting device can further comprise a second bearing structure, wherein the sensor carrier is additionally also pivotally mounted on the second bearing structure, wherein the second bearing structure is arranged axially along the tool spindle axis between the tool spindle and the machining tool, and wherein the sensor carrier extends from the proximal tool end to the distal tool end.

[0055] In particular, in such an embodiment, the sensor carrier can be U-shaped, i.e., the aforementioned sensor carrier arm can comprise, in addition to the first and second sections, a third section which adjoins the second section and extends parallel to the first section, i.e., radially to the tool spindle axis. The third section of the sensor carrier arm can be pivotably mounted on the second bearing structure, while the first section is pivotably mounted on the first bearing structure, and the second section extends along the machining tool, so that the sensor carrier arm encompasses the machining tool in a bow-like manner.The second section can be connected to the first section and / or the third section in a detachable manner, for example via a hook connection, a snap-in connection, a screw connection or a magnetic connection, whereby the bow-like sensor carrier arm can be opened to facilitate replacement of the processing tool.

[0056] Regardless of the presence of a second bearing structure, the first bearing structure, particularly if it is arranged distally from the distal tool end, may have a protective wall. In such a case, the protective wall is preferably arranged at the distal tool end distally from the sensor carrier and preferably extends in a plane perpendicular to the tool spindle axis.

[0057] To ensure repeatability and accuracy of the measuring position, the swivel device can have a measuring position stop against which the sensor carrier hits in the measuring position.

[0058] The measuring position stop can be arranged between the distal tool end and the protective wall, wherein the protective wall preferably extends radially with respect to the tool spindle axis such that the measuring position stop is concealed by the protective wall when viewed along the tool spindle axis in the direction of the proximal tool end. The measuring position stop is preferably concealed by the sensor carrier, in particular by the carrier body of the sensor carrier, when viewed from the proximal tool end along the tool spindle axis. The measuring position stop can in particular be attached to an inner side of the protective wall facing the sensor carrier.

[0059] This allows the measuring position stop to be protected from contamination, which may arise, for example, during the machining process of the workpiece.

[0060] Alternatively or additionally, an area of ​​the measuring position stop can be pressurized with compressed air to prevent the ingress of contaminants and, preferably, at the same time to free the stop surfaces of the measuring position stop from any contaminants.

[0061] Preferably, the pivoting device comprises a pivoting device drive which is designed to pivot the sensor carrier between the measuring position and the parking position.

[0062] If a protective wall is present as described above, the pivoting device drive can be arranged on a side of the protective wall facing away from the sensor carrier and connected to the sensor carrier through the protective wall, for example, by means of a connecting pin extending through an arcuate slot in the protective wall. Alternatively, the pivoting device drive can also be located on a side of the protective wall facing the sensor carrier.

[0063] The swivel device drive can comprise a linear drive which has a drive element connected to the sensor carrier, wherein the drive element is linearly extendable in a plane perpendicular to the tool spindle axis tangentially to a swivel circle which is concentric to the tool spindle axis, and wherein the linear drive is rotatably mounted about a bearing axis running parallel to the tool spindle axis.

[0064] The parking position can be defined by an end position of the linear drive, in which the drive element is either maximally extended or maximally retracted, i.e. retracted.

[0065] The linear actuator can be, for example, an electric motor drive, a hydraulic drive, or a pneumatic drive. The drive element can be, for example, a piston rod.

[0066] Alternatively, the swivel device drive can comprise a rotary motor (i.e., a motor for generating a rotary movement), wherein the rotary motor has a driven motor shaft that interacts with the sensor carrier and preferably runs parallel to the tool spindle axis. The motor shaft defines a rotation axis of the rotary motor, wherein the rotation axis can either coincide with the tool spindle axis or be arranged offset from the tool spindle axis. The rotary motor can, in particular, be an electric motor, a hydraulic motor, or a pneumatic motor.Particularly in cases where the machine tool includes a balancing device arranged at the distal end of the tool coaxially to the tool spindle axis for balancing the machining tool, it may be advantageous if the rotation axis of the pivot drive is offset from the tool spindle axis to avoid interfering with the balancing device. To still achieve pivoting of the first and / or, if applicable, second centering sensor about the tool spindle axis, a transmission structure such as a spur gear or toothed belt stage can be additionally provided to transmit rotation of the motor shaft to the sensor carrier.

[0067] In a swivel drive with a rotary motor, the parking position can be defined by a predetermined, controlled rotational position of the motor shaft.

[0068] Regardless of the type of swivel drive, the parking position can alternatively be defined by a mechanical parking position stop. It is also conceivable that the measuring position is defined by a predefined, controlled position of the swivel drive, in particular the drive element of the linear drive or the motor shaft of the rotary motor.

[0069] BRIEF DESCRIPTION OF THE DRAWINGS

[0070] Preferred embodiments of the invention are described below with reference to the drawings, which are for illustrative purposes only and are not to be construed as limiting. In the drawings:

[0071] Fig. 1 is a schematic perspective view of a machine tool according to a first embodiment with the centering sensor in measuring position;

[0072] Fig. 2 is an enlarged view of the section E1 marked in Fig. 1;

[0073] Fig. 3 the embodiment shown in Fig. 1 with the centering sensor in

[0074] parking position;

[0075] Fig. 4 is an enlarged view of section E3 marked in Fig. 3;

[0076] Fig. 5 is a perspective view of a section of the machine tool comprising the tool spindle and the pivoting device according to a modification of the first embodiment;

[0077] Fig. 6A is a front view of the components shown in Fig. 5;

[0078] Fig. 6B shows a first sectional view in the central longitudinal section plane VV marked in Fig. 6A;

[0079] Fig. 6C shows a second sectional view in the cross-sectional plane UU marked in Fig. 6A;

[0080] Fig. 7 is a schematic perspective view of a machine tool according to a second embodiment with the centering sensor in measuring position;

[0081] Fig. 8 is an enlarged view of section E4 marked in Fig. 7;

[0082] Fig. 9 is a schematic perspective view of a machine tool according to a third embodiment with the centering sensor in measuring position;

[0083] Fig. 10 is an enlarged view of section E5 marked in Fig. 9;

[0084] Fig. 11 is a perspective view of a section of the machine tool comprising the tool spindle and the pivoting device according to a modification of the third embodiment;

[0085] Fig. 12A is a front view of the components shown in Fig. 11;

[0086] Fig. 12B is a sectional view in the central longitudinal plane WW marked in Fig. 12A;

[0087] Fig. 13 is a schematic perspective view of a machine tool according to a fourth embodiment with the centering sensor in measuring position;

[0088] Fig. 14 is an enlarged view of section E6 marked in Fig. 13;

[0089] Fig. 15 is a schematic perspective view of a machine tool according to a fifth embodiment with the centering sensor in measuring position;

[0090] Fig. 16 is an enlarged view of section E7 marked in Fig. 15;

[0091] Fig. 17 is a schematic perspective view of a machine tool according to a sixth embodiment with the centering sensor in the measuring position; Fig. 18 is an enlarged view of the section E8 marked in Fig. 17;

[0092] Fig. 19 shows a modification of the sixth embodiment in the section E8 marked in Fig. 17 with a sensor carrier in a closed state, and

[0093] Fig. 20 shows the modification of the sixth embodiment of Fig. 19 with a sensor carrier in an open state.

[0094] DESCRIPTION OF PREFERRED EMBODIMENTS

[0095] Figures 1-20 show machine tools 1 according to various embodiments of the invention. The following first explains those features of the machine tool 1 that occur in all the embodiments shown.

[0096] The machine has a machine bed 11 on which a tool carrier 12 is guided so as to be displaceable along a radial feed direction X. A tool spindle 15 is arranged on the tool carrier and defines a tool spindle axis B. The tool spindle comprises a drive motor housing 151 in which a drive motor 1512 is arranged, and a tool spindle shaft 152 which is rotatable in the drive motor housing 151 about the tool spindle axis B and is driven by the drive motor 1512. A machining tool in the form of a helically profiled grinding wheel (grinding worm) 16 is clamped on the tool spindle 15. The grinding worm 16 is driven by the drive motor 1512 to rotate about a tool spindle axis B. The tool spindle 15 with the clamped grinding worm 16 is displaceable along a shift direction Y relative to the tool carrier 12.To move the tool spindle 15 along the shift direction Y, a shift slide 14 is provided on which the tool spindle 15 is arranged. The tool spindle 15 with the clamped grinding worm 16 is also displaceable along a feed direction Z relative to the tool carrier. To move the tool spindle 15 along the feed direction Z, an axial slide 13 is provided on which the shift slide 14 and thus the tool spindle 15 are arranged.

[0097] To enable adaptation to the helix angle of the gear to be machined, the shift slide and thus the tool spindle 15 mounted thereon can be pivoted about a pivot axis running parallel to the X-axis (the so-called A-axis). This is achieved by a pivoting body 141, which can be pivoted about the A-axis relative to the axial slide and on which the shift slide 14 is arranged for linear displacement.

[0098] The machine bed 11 further supports a workpiece carrier 20, which can be designed as a turret that can be pivoted about an axis C3 between two or more positions. A workpiece spindle 21 is arranged on the workpiece carrier. A workpiece 23 can be clamped on the workpiece spindle 21 and driven to rotate about a workpiece spindle axis C1. The workpiece spindle 21 visible in Figures 1, 3, 7, 9, 13, 15 and 17 is located in a machining position in which the workpiece 23 can be machined with the grinding worm 16. In order to clamp a still unmachined workpiece (blank), preferably by an automatic workpiece changer (not shown), the workpiece carrier 20 can be pivoted about the axis C3 into a workpiece change position.

[0099] Once the new workpiece to be machined is clamped, a centering operation is performed. For this purpose, the workpiece spindle 21 is rotated, and the position of the tooth gaps of the workpiece 23 is measured using a non-contact centering sensor 31. The rolling coupling angle is determined based on this measurement.

[0100] The machine tool 1 has a pivoting device arranged on the tool carrier 12. The pivoting device comprises a sensor carrier 40, to which the centering sensor 31 is attached. The pivoting device is designed to pivot the centering sensor 31 about the tool spindle axis B between a measuring position in which the centering operation is performed and a parking position in which the centering sensor 31 is located during the machining of the workpiece 23.

[0101] If the workpiece spindle 21, which carries the workpiece 23 to be machined, is in the machining position, the workpiece 23 is brought into collision-free engagement with the grinding worm 16 by moving the tool carrier 12 along the X-axis. The workpiece 23 is now machined by the grinding worm 16 in rolling engagement. This is achieved through one or more machining strokes, for example one or more roughing strokes followed by one or more finishing strokes. Optionally, one or more polishing strokes can follow. During each machining stroke, the grinding worm 16 is continuously advanced along the Z-axis relative to the workpiece 23 with a constant or variable radial X-feed (so-called axial stroke). At the same time, the tool spindle 15 is moved continuously or stepwise along the shift axis Y in order to allow unused areas of the grinding worm 16 to be used in the machining process (so-called shift movement).

[0102] First

[0103] Figures 1-4 schematically show a machine tool 1 for machining the tooth flanks of pre-toothed workpieces according to a first embodiment of the invention. Figures 1 and 3 each show a simplified perspective view of the machine tool 1. Figures 2 and 4 each show enlarged views of the sections marked in Figures 1 and 3. Figure 5 shows a perspective view of a section of the machine tool 1 comprising the shift carriage 14, the tool spindle 15 and the pivoting device with the sensor carrier 40 and the centering sensor 31 according to a modification of the first embodiment. Fig. 6A shows a front view of the components shown in Fig. 5, Fig. 6B shows a first sectional view in the central longitudinal section plane VV marked in Fig. 6A, and Fig. 6C shows a second sectional view in the cross-sectional plane UU marked in Fig. 6A.

[0104] Fig. 2 shows an enlarged view of the section E1 marked in Fig. 1, in which the centering sensor 31 can be seen in the measuring position. The centering sensor 31 has a sensor axis S that defines a measuring direction. In the measuring position, the sensor axis S is preferably perpendicular to the workpiece spindle axis C1.

[0105] The machining tool, in the example shown the grinding worm 16, has a proximal tool end facing the tool spindle 15 and a distal tool end axially opposite the proximal tool end along the tool spindle axis B. The pivoting device has a bearing structure which is fastened to the shift carriage 14 and on which the sensor carrier 40 is pivotably mounted.

[0106] In this first embodiment, the bearing structure is arranged distally from the distal tool end and comprises a protective wall 50 extending in a plane perpendicular to the tool spindle axis B. The sensor carrier 40 and the centering sensor 31 are located axially between the distal tool end and the protective wall 50. The protective wall 50 is attached to the shift carriage 14. To enable replacement of the grinding worm 16, the protective wall 50 is preferably pivotably or removably attached to the shift carriage 14.

[0107] In the first embodiment shown here, the sensor carrier 40 has a sensor carrier arm 41 which extends radially away from the tool spindle axis B, wherein the centering sensor 31 is located at the freestanding end of the sensor carrier arm 41 and protrudes radially beyond a maximum radius of the grinding worm 16 so that the centering sensor 31 can be positioned close enough to the workpiece 23 for the centering measurement without the grinding worm 16 colliding with the workpiece 23. As shown in Fig. 5, in a modification of the first embodiment, the sensor carrier arm 41 can be angled at its freestanding end.

[0108] The pivoting device drive, which is designed to pivot the sensor carrier 40 from the measuring position to the parking position and vice versa, comprises in this first embodiment a linear drive 60, which is arranged on a side of the protective wall 50 facing away from the sensor carrier 40. The linear drive 60 comprises a drive element 61 in the form of a piston rod, which can be extended linearly in a plane parallel to the protective wall 50. The drive element 61 is connected to the sensor carrier 40 via a connecting pin 63, which extends parallel to the tool spindle axis B through a slot 51 in the protective wall 50. The slot 51 is arc-shaped and corresponds to an arc segment of a circle arranged concentrically to the tool spindle axis B.

[0109] The linear drive 60 has a pivot bearing 62 at an end opposite the drive element 61, which defines a bearing axis D about which the linear drive 60 is rotatably mounted. The bearing axis D runs parallel to, but offset from, the tool spindle axis. To pivot the sensor carrier 40, the drive element 61 is retracted or extended. The drive element performs a movement with a movement component in the tangential direction, where the term "tangential direction" in this context refers to a pivoting circle defined by the pivoting movement of the sensor carrier. The connecting pin 63, which is connected to the drive element, is guided along the arcuate slot 51, which leads to a pivoting of the linear drive 60 about the bearing axis D and, simultaneously, to a pivoting of the sensor carrier 40 about the tool spindle axis B.The connecting pin 63 can be rotatably connected to the drive element and rigidly connected to the sensor carrier, or rigidly connected to the drive element and rotatably connected to the sensor carrier.

[0110] In Fig. 3, the machine tool 1 is shown in a state in which the centering sensor 31 is in a parked position. Fig. 4 shows an enlarged view of the section E3 marked in Fig. 3, in which the parked position can be seen enlarged. In the first embodiment shown here, the parked position is defined by an end position of the linear drive 60, in which the drive element 61 is maximally retracted (retracted). In this parked position, the centering sensor 31 is directed downward, i.e., toward the machine bed 11.

[0111] The linear drive can be formed, for example, by an electric, hydraulic or pneumatic cylinder.

[0112] Fig. 5 shows a more detailed and enlarged perspective view of the pivoting device and the tool spindle 15, wherein the tool spindle 15 has a balancing device which is not visible in Figures 1-4. The balancing device has a balancing head 153, visible in Figures 6A and 6C, which is located substantially within the tool spindle shaft 152, as well as a communication module 154 for sending and / or receiving signals to or from the balancing head 153. In the embodiment shown here, the communication module 154 is attached to the protective wall 50, wherein the protective wall 50 has a through-hole for connections 155 of the communication module. As indicated in Fig. 5 by a dashed arrow, the protective wall can be folded down to facilitate replacement of the grinding worm 16.

[0113] Fig. 6B shows a sectional view of the pivoting device, which has a mechanical measuring position stop 52 arranged on a side of the protective wall 50 facing the grinding worm 16 and is fastened to the protective wall 50 by screws 521 (see Fig. 5) projecting through the protective wall 50. The sensor carrier

[0114] 40 comprises a hollow cylindrical support body 42, from which the sensor support arm

[0115] 41 protrudes radially outwards. The sensor carrier arm 41 can be manufactured in one piece with the carrier body. A bearing bush 53 is arranged concentrically inside the carrier body 42 and is fastened to the protective wall 50. An annular rolling bearing device is arranged between the bearing bush 53 and the carrier body 42, wherein the rolling bearing device, as shown in Fig. 6C, can in particular comprise two axially adjacent, annular angular contact ball bearings 54. The carrier body 42 has, on its side facing the protective wall 50, an arcuate groove 43 arranged concentrically with respect to the tool spindle axis, in which the measuring position stop 52 is arranged. A stop screw 44 can be screwed into the carrier body 42 tangentially to the tool spindle axis, with which stop screw 44 the measuring position can be adjusted with regard to its angular position, preferably such that the sensor axis S is perpendicular to the workpiece spindle axis C1.The stop screw 44 is fixed after its adjustment. In the measuring position, the stop screw 44 strikes the measuring position stop 52 along a first pivoting direction, resulting in a defined and repeatable angular position of the centering sensor 31 mounted on the sensor carrier 40.

[0116] To ensure precision, the measuring position stop 52 and the stop screw 44 should be protected from contamination, which can arise primarily during machining of the workpiece 23. The protective wall 50 therefore advantageously extends radially with respect to the tool spindle axis B in such a way that the measuring position stop 52, viewed along the tool spindle axis B in the direction of the tool spindle 15, is concealed by the protective wall 50. In the embodiment shown here, the measuring position stop 52 is concealed from the other side, i.e. viewed from the tool spindle along the tool spindle axis, by the carrier body 42 of the sensor carrier 40. In addition, the area of ​​the measuring position stop 52 can be pressurized with compressed air to prevent the ingress of contamination and, in a preferred embodiment, to simultaneously clean the stop surfaces of any contamination.

[0117] Second

[0118] Figures 7 and 8 schematically show a machine tool 1 for machining the tooth flanks of pre-toothed workpieces according to a second embodiment of the invention, wherein Fig. 8 shows an enlarged view of the section E4 marked in Fig. 7.

[0119] This second embodiment differs from the first embodiment described above only in that the pivot drive comprises a rotary motor 70 instead of a linear drive. Descriptions of features given in the context of the first embodiment, which have the same reference numerals in Figures 7 and 8 as in Figures 1 and 2, respectively, apply analogously to the second embodiment. The rotary motor 70 has a motor shaft which interacts with the sensor carrier 40 through the protective wall 50 and runs parallel to the tool spindle axis B. In the second embodiment shown here, the rotation axis R of the motor shaft is offset from the tool spindle axis B. Such an offset may be necessary if a balancing device for the grinding worm 16 is additionally attached concentrically to the tool spindle axis B at the distal end of the grinding worm 16, as shown in Figures 5-6C.In order to still generate a pivoting of the sensor carrier about the tool spindle axis B when the rotary motor 70 is arranged offset to the tool spindle axis B, a transmission structure, such as a spur gear or toothed belt stage (not visible in Figures 7 and 8), is located on the side of the protective wall 50 facing away from the rotary motor 70 for transmitting the rotation of the motor shaft to the sensor carrier 40. In a variant (not shown), however, it would also be conceivable to arrange the rotary motor in such a way that the axis of rotation of the motor shaft coincides with the tool spindle axis B, whereby a transmission structure can be dispensed with.

[0120] In this second embodiment, a mechanical measuring position stop can also be provided for defining the measuring position as described above, while the parking position can be given by a predefined, controlled rotational position of the motor shaft.

[0121] Third embodiment

[0122] Figures 9 and 10 schematically show a machine tool 1 for machining the tooth flanks of pre-toothed workpieces according to a third embodiment of the invention, wherein Fig. 10 shows an enlarged view of the section E5 marked in Fig. 9.

[0123] The third embodiment differs from the first embodiment described above in that the bearing structure on which the sensor carrier 40 with the centering sensor 31 is pivotally mounted is located proximal to the proximal end of the grinding worm 16, between the grinding worm 16 and the drive motor housing 151. In particular, the bearing structure can be attached directly to the drive motor housing 151 or to a tool spindle bearing flange 1511 of the tool spindle 15.

[0124] Analogous to the first embodiment, the pivoting device of the embodiment shown in Figures 9 and 10 also has a linear drive 60 connected to the sensor carrier 40. However, in this third embodiment, the pivot bearing 62 of the linear drive 60 is attached directly to the drive motor housing 151, as shown in Figures 9 and 10.

[0125] Figures 11-12B show a modification of the third embodiment in which a rotary motor 70 is used instead of a linear drive, and in which the tool spindle 15, as described above in connection with the second embodiment, has a balancing device.

[0126] Fig. 11 shows a perspective view of a section of the machine tool comprising the tool spindle 15 and the pivoting device with the sensor carrier 40 and the centering sensor 31. Fig. 12A shows a front view of the components shown in Fig. 11 and Fig. 12B shows a sectional view in the central longitudinal section plane WW marked in Fig. 12A.

[0127] Figures 11-12B show a support wall 80, which is arranged distally from the distal end of the grinding worm 16. In the present embodiment, this support wall 80 serves as a holding structure for the communication module 154 of the balancing device and, unlike the protective wall 50 in Figures 5-6C, is not part of the pivoting device for the centering sensor. In the embodiment shown in Figures 11-12B, the bearing structure of the pivoting device is arranged on the tool spindle bearing flange 1511, wherein the tool spindle bearing flange 1511 is fixedly attached to the drive motor housing 151 and has an opening for receiving the rotating tool spindle shaft 152. The sensor carrier 40 comprises a carrier body 42, from which the sensor carrier arm 41 projects radially outward.The bearing structure comprises an annular rolling bearing device, wherein the rolling bearing device in particular comprises a crossed roller bearing 55, which is arranged radially between the tool spindle bearing flange 1511 and the carrier body 42, such that the carrier body 42 with the sensor carrier arm 41 is pivotable relative to the stationary tool spindle bearing flange 1511. A rotary motor 70 is provided to drive the pivoting movement, which has a motor shaft 71 connected to the carrier body 42 of the sensor carrier 40 via a transmission structure 72, in particular a gear stage.

[0128] Fourth embodiment

[0129] Figures 13 and 14 schematically show a machine tool 1 for machining the tooth flanks of pre-toothed workpieces according to a fourth embodiment of the invention, wherein Fig. 14 shows an enlarged view of the section E6 marked in Fig. 13.

[0130] The fourth embodiment differs from the first embodiment described above in that the sensor support arm 41 is "L-shaped," i.e., it has a first section 411 extending radially with respect to the tool spindle axis B, and a second section 412 extending axially parallel to the tool spindle axis B, and in that a second centering sensor 32 is arranged on the sensor support arm 41. The first centering sensor 31 and the second centering sensor 32 are arranged side by side on the second section 412 of the sensor support arm 41, wherein the first centering sensor 31 and / or the second centering sensor 32 can be manually moved along the tool spindle axis B.

[0131] The use of a second centering sensor 32 offers advantages for workpieces 23 that have double toothing, i.e., a first toothing 231 and a second toothing 232, which, as shown in Fig. 13, are arranged concentrically one above the other along the workpiece spindle axis C1. The use of a second centering sensor is particularly advantageous when the first toothing 231 has a module that differs from the module of the second toothing 232.

[0132] Fifth

[0133] Figures 15 and 16 schematically show a machine tool 1 for machining the tooth flanks of pre-toothed workpieces according to a fifth embodiment of the invention, wherein Fig. 16 shows an enlarged view of the section E7 marked in Fig. 15. The fifth embodiment differs from the first embodiment described above in that the sensor carrier arm 41 is "U-shaped", ie, it has a first section extending radially with respect to the tool spindle axis B

[0134] 411 , a second section extending axially parallel to the tool spindle axis B

[0135] 412, as well as a third section 413 extending radially with respect to the tool spindle axis B, and that a second centering sensor 32 is arranged on the sensor support arm 41. The first centering sensor 31 and the second centering sensor 32 are arranged next to one another on the second section 412 of the sensor support arm 41, wherein the first centering sensor 31 and / or the second centering sensor 32 can be manually moved along the tool spindle axis B. In this fifth embodiment, the sensor support arm 41 forms a bracket which spans the grinding worm 16, since the second section 412 extends from the proximal end to the distal end of the grinding worm 16. The pivoting device has a first bearing structure with a protective wall 50, which is arranged distally from the distal end of the grinding worm 16, analogous to the first, second and fourth embodiments described above.Furthermore, in this fifth embodiment, the pivoting device has a second bearing structure on which the third section of the sensor carrier arm 413 is rotatably mounted, and which is located between the proximal end of the grinding worm 16 and the drive motor housing 151. The second bearing structure can, for example, be designed analogously to the bearing structure shown in Fig. 12B, i.e., in particular, be arranged on the tool spindle bearing flange 1511 and have a rolling bearing extending annularly around the tool spindle bearing flange 1511. In this fifth embodiment, the pivoting device drive is arranged distally from the protective wall 50, as described for the first embodiment, and is connected to the sensor carrier 40 through the protective wall 50.

[0136] Sixth

[0137] Figures 17 and 118 schematically show a machine tool 1 for machining the tooth flanks of pre-toothed workpieces according to a sixth embodiment of the invention, wherein Fig. 18 shows an enlarged view of the section E8 marked in Fig. 17.

[0138] The sixth embodiment differs from the fifth embodiment described above only in that a sensor drive 33 is arranged on the sensor support arm 41, specifically on the third section 413 of the sensor support arm 41, which drives the first centering sensor 31 to a displacement parallel to the tool spindle axis B along the second section 412 of the sensor support arm 41 (instead of a manual displacement).

[0139] Figures 19 and 20 show a modification of the sixth embodiment, in which the second section 412 of the sensor support arm 41 can be detached from the first section 411 in order to open the bracket and thus, for example, facilitate replacing the grinding worm. In particular, the second section 412, as shown in Fig. 20, can be pivoted about an axis running parallel to the third section 413 and can be hooked onto the first section 411 via a hook connection. Alternatively, the first section 411 and the second section 412 can be detachably connected to one another, for example via a snap-in connection, a plug-in connection, a screw connection, or a magnetic connection. Furthermore, a detachable connection can also be present between the second section 412 and the third section 413 (not shown).

[0140] Further variations

[0141] Of course, many modifications of the embodiments shown are possible, and the invention is not limited to these embodiments.

[0142] In particular, the machining tool can also be a profile grinding wheel, a hob or a side milling cutter.

[0143] LIST OF REFERENCE SYMBOLS

[0144] 1 machine tool 44 stop screw

[0145] 11 Machine bed 50 Protective wall

[0146] 12 tool holder 51 slot

[0147] 13 Axial slide 52 Measuring position stop

[0148] 14 shift slides 521 screws

[0149] 141 Swivel body 53 Bearing bush

[0150] 15 tool spindle 54 angular contact ball bearings

[0151] 151 Drive motor housing 55 Cross roller bearing

[0152] 1511 Tool spindle bearing flange 60 linear drive

[0153] 1512 Drive motor 61 Drive element

[0154] 152 Tool spindle shaft 62 Pivot bearing

[0155] 153 Balancing head 63 Connecting pin

[0156] 154 communication module 70 rotary motor

[0157] 155 Connections 71 Motor shaft

[0158] 16 Grinding worm 72 Transmission structure

[0159] 20 workpiece carriers 80 retaining wall

[0160] 21 Workpiece spindle A swivel axis

[0161] 23 Workpiece B Tool spindle axis

[0162] 31 first centering sensor C1 workpiece spindle axis

[0163] 32 second centering sensor D bearing axis

[0164] 33 Sensor drive S sensor axis

[0165] 40 Sensor carrier R rotation axis

[0166] 41 Sensor carrier arm

[0167] 411 first section X delivery direction

[0168] 412 second section Y shift direction

[0169] 413 third section Z axial direction

[0170] 42 carrier bodies

[0171] 43 groove

Claims

PATENT CLAIMS 1. A machine tool for machining pre-toothed workpieces (23), comprising: a tool carrier (12) on which a tool spindle (15) is arranged for the rotational drive of a machining tool (16) about a tool spindle axis (B); a workpiece carrier (20) on which a workpiece spindle (21) is arranged for the rotational drive of a pre-toothed workpiece (23) to be machined about a workpiece spindle axis (C1); an axial slide (13) guided on the tool carrier (12) which is displaceable relative to the workpiece carrier (20) in an axial direction (Z) parallel to the workpiece spindle axis (C1), a shift slide (14) which is arranged on the axial slide (13) and displaceable parallel to the tool spindle axis (B) relative to the workpiece carrier (20), a first contactless centering sensor (31) which is designed to determine a phase position of teeth of the workpiece (23),when the workpiece rotates about the workpiece spindle axis (B), wherein the centering sensor (31) defines a sensor axis (S) which corresponds to a measuring direction of the centering sensor (31), and a pivoting device, wherein the pivoting device comprises a pivotable sensor carrier (40) to which the first centering sensor (31) is attached in order to pivot the first centering sensor (31) between a measuring position and a parking position, wherein the first centering sensor (31) is fastened to the sensor carrier (40) such that the sensor axis (S) is perpendicular to the tool spindle axis (B), wherein the tool spindle (15) and the pivoting device are arranged on the shift carriage (14), and wherein the pivoting device is designed to pivot the first centering sensor (31) about the tool spindle axis (B).

2. Machine tool according to claim 1, wherein the first centering sensor (31) is mounted on the sensor carrier (40) so as to be displaceable parallel to the tool spindle axis (B).

3. Machine tool according to claim 2, wherein the sensor carrier (40) comprises a sensor drive (33) which is designed to drive the first centering sensor (31) for displacement parallel to the tool spindle axis (B).

4. Machine tool according to one of the preceding claims, further comprising: a second contactless centering sensor (32) which is designed to determine a phase position of teeth of the workpiece (23) when the workpiece (23) rotates about the workpiece spindle axis (C1), wherein the second centering sensor (32) is attached to the sensor carrier (40), optionally displaceable parallel to the tool spindle axis (B), and wherein the first centering sensor (31) and the second centering sensor (32) are preferably arranged next to one another parallel to the tool spindle axis (B).

5. Machine tool according to one of the preceding claims, wherein the pivoting device comprises a first bearing structure, and wherein the sensor carrier (40) is pivotable on the first bearing structure about the Tool spindle axis (B) is pivotably mounted.

6. Machine tool according to claim 5, further comprising a Machining tool (16), wherein the machining tool (16) comprises: a proximal tool end and a distal tool end which is axially opposite the proximal tool end along the tool spindle axis (B), wherein the tool spindle (15) is designed to drive the machining tool (16) from the proximal tool end, and wherein the first bearing structure is arranged proximally of the proximal tool end.

7. Machine tool according to claim 5, further comprising a machining tool (16), wherein the machining tool (16) comprises: a proximal tool end and a distal tool end which is axially opposite the proximal tool end along the tool spindle axis (B), wherein the tool spindle (15) is designed to drive the machining tool (16) from the proximal tool end, and wherein the first bearing structure is arranged distally from the distal tool end.

8. Machine tool according to claim 7, wherein the pivoting device comprises a second bearing structure, wherein the sensor carrier (40) is pivotally mounted on the second of the bearing structures, wherein the second bearing structure is arranged proximally of the proximal tool end, and wherein the sensor carrier (40) extends from the proximal tool end to the distal tool end.

9. Machine tool according to claim 7 or 8, wherein the first bearing structure has a protective wall (50) which is arranged at the distal tool end distal from the sensor carrier (40) and which preferably extends in a plane perpendicular to the tool spindle axis (B).

10. Machine tool according to one of the preceding claims, wherein the pivoting device further comprises: a measuring position stop (52) against which the sensor carrier (40) abuts in the measuring position.

11. Machine tool according to claim 10 in combination with claim 9, wherein the measuring position stop (52) is arranged between the distal tool end and the protective wall (50), wherein the protective wall (50) preferably extends radially with respect to the tool spindle axis (B) such that the measuring position stop (52) is covered by the protective wall when viewed along the tool spindle axis (B) in the direction of the proximal tool end, and wherein the measuring position stop (52), when viewed from the proximal tool end along the tool spindle axis (B), is preferably covered by the sensor carrier (40).

12. Machine tool according to one of the preceding claims, wherein the pivoting device comprises a pivoting device drive which is designed to pivot the sensor carrier (40) between the measuring position and the parking position.

13. Machine tool according to claim 12 in combination with claim 9, wherein the pivoting device drive is arranged on a side of the protective wall (50) facing away from the sensor carrier (40) and is connected to the sensor carrier (40) through the protective wall (50).

14. Machine tool according to claim 12 or 13, wherein the swivel device drive comprises a linear drive (60) which has a drive element (61) connected to the sensor carrier (40), wherein the drive element (61) is linearly extendable in a plane perpendicular to the tool spindle axis (B) tangentially to a swivel circle which is concentric to the tool spindle axis, and wherein the linear drive (60) is rotatably mounted about a bearing axis (D) running parallel to the tool spindle axis (B).

15. Machine tool according to claim 12 or 13, wherein the swivel device drive comprises a rotary motor (70), wherein the rotary motor (70) has a motor shaft (71) which cooperates with the sensor carrier (40) and runs parallel to the tool spindle axis (B).

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