Clamping device for clamping workpieces

Abstract

The invention relates to a clamping device for clamping a workpiece, comprising a threaded spindle which extends along a spindle longitudinal axis and has a first threaded section with a first threaded pitch and a second threaded section with a second threaded pitch, the second threaded pitch being different from the first threaded pitch, a first spindle nut engaging with the first threaded section, and a second spindle nut engaging with the second threaded section. The second spindle nut is meshed with the second threaded section; a guide rail which extends parallel to the longitudinal axis of the spindle and on which the threaded spindle is rotatably mounted, on which guide rail the first spindle nut is mounted in a linearly movable and rotationally fixed manner; the clamping arm is supported on the second spindle nut in a manner of being capable of pivoting around a second pivot axis; and a connecting device, which is mounted on the first spindle nut so as to be pivotable about a first pivot axis and on the clamping arm so as to be pivotable about a third pivot axis, the first, second and third pivot axes being oriented parallel to each other, and the third pivot axis spool being arranged at a distance from the second pivot axis.

Description

Technical Field

[0001] The present invention relates to a clamping device for clamping a workpiece. Background Art

[0002] It is known from the manufacture of workpieces that a toggle clamp is a clamping device for clamping a workpiece so that the workpiece can be machined reliably. The advantages of a toggle clamp are that it can clamp quickly and has a large angular range. In addition, a relatively high clamping force can be achieved with a toggle clamp. Summary of the Invention

[0003] The object of the present invention is to provide a clamping device with which a workpiece can be clamped reliably during a large number of clamping processes.

[0004] This object is solved by a clamping device for clamping a workpiece having the features listed below:

[0005] The clamping device for clamping a workpiece according to the present invention comprises: a threaded spindle which extends along a spindle longitudinal axis and which has a first thread section with a first thread pitch and a second thread section with a second thread pitch, the second thread pitch being configured differently from the first thread pitch, wherein a first spindle nut meshes with the first thread section and a second spindle nut meshes with the second thread section; a guide rail which extends parallel to the spindle longitudinal axis and on which the threaded spindle is rotatably supported, wherein the first spindle nut is linearly movable and anti-rotationally supported on the guide rail; a clamping arm which is pivotably supported on the second spindle nut about a second pivot axis; and a connecting device which is pivotably supported on the first spindle nut about a first pivot axis and pivotably supported on the clamping arm about a third pivot axis, wherein the first, second and third pivot axes are oriented parallel to each other and the third pivot axis is arranged at a distance from the second pivot axis.

[0006] The first spindle nut and the second spindle nut each have respective thread sections with corresponding internal threads. Since the first thread pitch and the second thread pitch are configured differently from each other, the first spindle nut cannot mesh with the second thread section. In addition, the second spindle nut cannot mesh with the first thread section. Thus, when the first thread section and the second thread section are adjacent to each other, the first spindle nut cannot be rotated onto the second thread section. In addition, the second spindle nut cannot be rotated onto the first thread section.

[0007] The threaded spindle can be directly supported on the guide rail. For this purpose, a rotary bearing can be constructed on the guide rail, which is configured to support the threaded spindle in a rotatable manner about the longitudinal axis of the spindle, also referred to as the axis of rotation. In addition, the rotary bearing ensures a position-fixed coupling between the threaded spindle and the guide rail, such that the threaded spindle has a single rotational degree of freedom relative to the guide rail and no translational degree of freedom. Alternatively, it can be provided that the rotary bearing is constructed on other components of the clamping device, such as the drive device for the clamping device, and that this other component is directly or indirectly coupled to the guide rail. In this case, it is also provided that the first spindle nut has no rotational degree of freedom relative to the guide rail and has only a single translational degree of freedom with linear mobility along the longitudinal axis of the spindle.

[0008] The second spindle nut is also arranged torsion-resistant with respect to the guide rail. This is achieved in particular by means of a connecting device that connects the first spindle nut and the second spindle nut and prevents the second spindle nut from twisting relative to the first spindle nut about the longitudinal axis of the spindle.

[0009] The clamping arm is pivotably supported on the second spindle nut between an open position and a clamping position about a second pivot axis. In the open position, the clamping arm is spaced apart from the workpiece. In this way, the workpiece to be clamped can be positioned below the clamping arm or a previously clamped workpiece can be removed from the clamping device. In the clamping position, the clamping arm presses against the workpiece, thereby clamping the workpiece relative to the base, for example.

[0010] Since the first threaded section and the second threaded section are two parts of the same threaded spindle, as the threaded spindle rotates about the longitudinal axis of the spindle, the first spindle nut moves along the first threaded section and the second spindle nut moves along the second threaded section. Thereby, the connecting device supported on the first spindle nut and the clamping arm pivots simultaneously about the first pivot axis and the third pivot axis. Here, the distance perpendicular to the longitudinal axis of the spindle between the first pivot axis and the third pivot axis changes. If the first spindle nut and the second spindle nut approach each other, the connecting device will become increasingly oriented perpendicular to the longitudinal axis of the spindle. Thereby, the distance perpendicular to the longitudinal axis of the spindle between the first pivot axis and the third pivot axis increases. This in turn causes the clamping arm coupled to the connecting device to pivot about the second pivot axis. If the distance between the first pivot axis and the third pivot axis increases, the clamping arm becomes increasingly oriented perpendicular to the longitudinal axis of the spindle. In this way, the connecting device and the clamping arm become increasingly parallel. Preferably, the first spindle nut is arranged above the second spindle nut. In this way, when the first spindle nut moves downward, an orientation of the connecting device and the clamping arm perpendicular to the longitudinal axis of the spindle is achieved, and when the first spindle nut moves upward, an orientation of the connecting device and the clamping arm along the longitudinal axis of the spindle is achieved.

[0011] By moving the second spindle nut along the second thread section, the clamping arm supported on the second spindle nut moves along the longitudinal axis of the spindle. Thus, when the second spindle nut moves upward, the clamping arm also moves upward, and when the second spindle nut moves downward, the clamping arm also moves downward. Upward is understood here as the direction away from the workpiece to be clamped and downward as the direction towards the workpiece to be clamped.

[0012] Since the first thread section and the second thread section have different pitches, when the threaded spindle rotates, the distances that the first spindle nut and the second spindle nut move along the longitudinal axis of the spindle are also different.

[0013] In addition, the first thread section can be different from the second thread section in terms of the thread direction (right-hand thread, left-hand thread).

[0014] If the first thread section and the second thread section have the same thread direction, the first spindle nut and the second spindle nut move in the same direction, that is, either both move upward simultaneously or both move downward simultaneously. If the first thread section and the second thread section have different thread directions, the first spindle nut and the second spindle nut move in opposite directions, that is, either the first spindle nut moves upward while the second spindle nut moves downward, or the first spindle nut moves downward while the second spindle nut moves upward.

[0015] Further features for developing the present invention are the subject matter of the dependent claims having the features listed below:

[0016] Preferably, a drive device is provided with which the threaded spindle can be driven.

[0017] Preferably, the drive device has an electric motor and a current monitoring device for monitoring the torque applied by the electric motor. The current monitoring device can be, for example, part of the control device assigned to the electric motor, and with this control device, in particular, the motor torque is controlled. The control device can in turn be part of a higher-level control system, and with this control system, the automatic operation of the clamping device can be achieved.

[0018] Preferably, the first thread section has a larger pitch than the second thread section. Thus, when the threaded spindle rotates, the first stroke passed by the first spindle nut is greater than the second stroke passed by the second spindle nut during this rotation. In this way, due to the movement of the first spindle nut and the transmission action of the connecting device, the clamping arm can cover a larger pivoting angle range, while due to the shorter second stroke passed by the second spindle nut, the clamping arm only moves a small stroke length along the longitudinal axis of the spindle.

[0019] Furthermore, it is preferably provided that the first thread section and the second thread section have the same thread direction. By the downward movement of the second spindle nut and thus also the downward movement of the clamping arm, that is to say, in the direction towards the workpiece to be clamped, in particular the clamping force applied to the workpiece is increased. For this purpose, a small pitch is advantageous, since in this case a large clamping force can be generated with a small driving torque applied to the threaded spindle. With regard to the first thread section, a large pitch is advantageous, since this enables the clamping arm to pivot smoothly.

[0020] If the first thread section has a larger pitch than the second thread section, it is preferably provided that the first thread section is longer than the second thread section.

[0021] Preferably, the second thread section is self-locking. In this case, no torque is required to maintain the set position, in particular the clamping position. Therefore, if a drive device is provided, no drive power needs to be supplied any longer when maintaining the position, in particular the clamping position.

[0022] It is preferably provided that the first thread section has a pitch in the centimeter range, preferably in the range from 1 to 100 cm, particularly preferably in the range from 2 to 50 cm.

[0023] It is preferably provided that the second thread section has a pitch in the centimeter range, preferably in the range from 1 to 100 cm, particularly preferably in the range from 2 to 50 cm.

[0024] It is preferably provided that the guide rail has a groove, and the guiding section of the first spindle nut is received in the groove in a linearly movable manner. The guiding section is linearly movable with respect to the spindle longitudinal axis here.

[0025] Furthermore, it is preferably provided that the groove has an undercut, and the undercut and the guiding section are configured together in such a way that the guiding section is prevented from slipping out of the guide rail in the spatial direction transverse to the spindle longitudinal axis. Particularly preferably, it is provided that the contour of the guiding section corresponds to the contour of the groove configured in the guide rail in a cross-section oriented orthogonally to the spindle longitudinal axis. By way of pure example, the groove is configured as a T-slot or a dovetail slot.

[0026] It is preferably provided that the first thread section and the second thread section are separated from each other by means of the threadless shoulder of the threaded spindle. In this way, it is possible to prevent the first spindle nut and / or the second spindle nut from reaching into the other thread section at the end of the thread section assigned to it and the corresponding spindle nut from being clamped in the thread section not assigned to it.

[0027] Preferably, the clamping arm further has a first arm section and a second arm section, between which a void is arranged that penetrates the clamping arm, wherein preferably the first arm section and the second arm section at least partially surround the second spindle nut. This can reduce the required structural space and the required material costs.

[0028] Preferably, the connecting device has a first coupling arm and a second coupling arm, wherein preferably the first coupling arm and the second coupling arm are oriented parallel to each other, and wherein preferably the first coupling arm and the second coupling arm surround the clamping arm.

[0029] Preferably, the adjusting device is arranged to adjust the height of the threaded spindle and preferably the guide rail relative to the substrate along the longitudinal axis of the spindle, such that in the clamping position the connecting device and / or the clamping arm is oriented perpendicular to the longitudinal axis of the spindle. This enables the clamping device to be adapted to tools having different heights, i.e., different extension lengths, along the longitudinal axis of the spindle.

[0030] Suitably, the first spindle nut is configured such that the third pivot axis lies in a pivot plane oriented transversely to the longitudinal axis of the spindle, which pivot plane is arranged at a distance from the first spindle nut in the direction of the second spindle nut. Since the first spindle nut meshes with the first thread section not only at one point but along an engagement length extending along the longitudinal axis of the spindle, the aforementioned distance refers to the midpoint of this engagement length. Preferably, the distance between the first end face of the first spindle nut arranged opposite the second spindle nut and the pivot plane is determined such that the pivot plane contains the first pivot axis and the second pivot axis in the clamping position.

[0031] It is also preferably provided that the first pivot axis and / or the third pivot axis is spaced apart from the longitudinal axis of the spindle. Description of the Drawings

[0032] The present invention will be described in detail below with reference to the drawings, wherein:

[0033] Figure 1 The clamping device in the clamping position is shown in an isometric view from diagonally above,

[0034] Figure 2 The clamping device in the Figure 1 shown clamping position is shown in a side view,

[0035] Figure 3 The Figure 1 and Figure 2 shown clamping device in the open position is shown in a side view,

[0036] Figure 4 The clamping device in the semi-open position is shown in a side view, Figures 1 to 3 of the

[0037] Figure 5 shows the clamping device in another clamping position 330, and Figures 1 to 4 the clamping device shown, and

[0038] Figure 6 shows Figures 1 to 5 the details of the clamping device shown. Detailed Description

[0039] Figure 1 The clamping device 100 is shown in an isometric view from obliquely above. The clamping device 100 has a threaded spindle 110 that extends along a spindle longitudinal axis 310. The threaded spindle 110 has a first threaded section 112 and a second threaded section 114. The threaded spindle 110 also has a non-threaded shoulder 116 that is arranged between the first threaded section 112 and the second threaded section 114. The shoulder 116 is covered by a first spindle nut 130 in the Figure 1 view shown. The threaded spindle 110 is configured to be rotatable about the spindle longitudinal axis 310. Preferably, a drive device 120 is provided that is coupled to the threaded spindle 110 and by which the threaded spindle 110 can be driven. The clamping device 100 also has a first spindle nut 130 and a second spindle nut 140. By way of pure example, the first spindle nut 130 is arranged above the second spindle nut 140 with respect to the spindle longitudinal axis 310 and Figure 1 the view shown.

[0040] Also by way of pure example, the first threaded section 112 is arranged above the second threaded section 114 with respect to the spindle longitudinal axis 310 and Figure 1 the view shown. The first spindle nut 130 meshes with the first threaded section 112. The second spindle nut 140 meshes with the second threaded section 114. The clamping device 100 also has a clamping arm 150. The clamping device 100 also has a connecting device. Preferably, the connecting device has a first coupling arm 172 and a second coupling arm 174. The second coupling arm 174 is covered in the Figure 1 view shown, but is visible in Figures 2 to 4 . The first coupling arm 172 and the second coupling arm 174 abut against the clamping arm from the outside on opposite sides of the clamping arm and thus surround the clamping arm.

[0041] The clamping arm 150 is pivotally connected to the connecting device about a first pivot axis 301 and is thus preferably pivotally connected to the first coupling arm 172 and the second coupling arm 174 about the first pivot axis 301. Preferably, the clamping arm 150 has a first arm section 154 and a second arm section 156. Preferably, a void 158 is provided between the first arm section 154 and the second arm section 156. Preferably, the second spindle nut 140 is at least partially disposed in the void 158 such that the first arm section 154 and the second arm section 156 at least partially surround the second spindle nut 140.

[0042] The clamping arm 150 is pivotally connected to the second spindle nut 140 about a second pivot axis 302. Preferably, the second pivot axis 302 intersects the spindle longitudinal axis 310. Thus, in particular, it is possible to prevent the clamping force transmitted to the second spindle nut 140 by the clamping arm 150 from causing the second spindle nut 140 to tilt or skew relative to the second thread section 114 in the clamping position 330. Preferably, the first spindle nut 130 is pivotally connected to the connecting device about a third pivot axis 303. Preferably, the first coupling arm 172 and the second coupling arm 174 are pivotally connected to the first spindle nut 130 about the third pivot axis 303. Preferably, the first pivot axis 301 and the third pivot axis 303 are arranged on opposite sides with respect to the spindle longitudinal axis 310. The first pivot axis 301, the second pivot axis 302, and the third pivot axis 303 are pure geometric axes. In order to ensure the corresponding pivotability, corresponding physical axes are provided, but they are not provided with reference numerals.

[0043] In Figure 1In the configuration shown, the clamping device 100 is in the clamping position 330. In the clamping position 330, the clamping arm 150 presses against the workpiece 200. Preferably, the clamping arm 150 presses against the workpiece 200 from above, that is to say, against the upper side of the workpiece 200. The workpiece 200 preferably abuts against the substrate 190 with its lower side, and the workpiece 200 is clamped towards the substrate by means of the clamping arm 150. It is preferably arranged that the distance between the first end face of the first spindle nut 130, which is arranged opposite the second spindle nut 140, and the pivot plane oriented transversely to the spindle longitudinal axis 310 is determined such that the pivot plane contains the first pivot axis 301, the second pivot axis 302 and the third pivot axis 303 in the clamping position 330. For this purpose, it is preferably arranged that the pivot plane and thus the third pivot axis 303 are spaced apart from the first spindle nut 130 in the direction of the second spindle nut 140. Since the first spindle nut 130 meshes with the first thread section 112 not only at one point but over an engagement length extending along the spindle longitudinal axis 310, the distance 340 relates to the midpoint of this engagement length, which distance quantifies the spacing between the pivot plane and the second spindle nut 140). Preferably, the first spindle nut 130 and the second spindle nut 140 are constructed such that the first spindle nut 130 can move behind the second spindle nut 140 as Figure 2 shown.

[0044] Preferably, the clamping arm 150 is constructed to introduce the clamping force into the workpiece 200 substantially pointwise in the clamping position 330. For this purpose, the clamping arm 150 preferably has clamping fingers 152, with which the clamping arm 150 contacts the workpiece 200 in the clamping position 330. Preferably, the clamping fingers 152 are constructed in an L-shape. Substantially pointwise in this context means that the clamping force is introduced only through a single contact surface which is small compared to the surface of the workpiece 200 facing the clamping arm 150. In this way, the clamping force can be reliably introduced into the workpiece 200, independently of the orientation of the clamping arm 150 relative to the relevant surface of the workpiece 200. Preferably, the workpiece 200 to be clamped is oriented such that the surface of the clamping arm 150 contacting the workpiece 200 is oriented parallel to the relevant surface of the workpiece 200. If the workpiece 200 to be clamped has an uneven, for example circular profile, on the part of this surface facing the clamping arm 150 and / or on the part of this surface facing the base on which the workpiece 150 is clamped, then corresponding mating parts are introduced between the part of this surface facing the clamping arm 150 and / or the part of this surface facing the base and the workpiece 150, which have a flat surface on the outside.

[0045] Preferably, in order to ensure the pivotability of the clamping arm 150 about the first pivot axis 301, the first arm section 154 is pivotally connected to the first coupling arm 172 by a first axis (not labeled) and the second arm section 156 is pivotally connected to the second coupling arm 174 by a second axis (not labeled). Alternatively, the first arm section 154 and the second arm section 156 are pivotally connected to the first coupling arm 172 and the second coupling arm 174 by a common axis. Preferably, the individual axes do not extend through the void 158. In this way, the first pivot axis 301 can be arranged near the second main spindle nut 140 and thus near the second pivot axis 302, and when the clamping arm 150 pivots about the second pivot axis relative to the second main spindle nut 140, the individual axes will not collide with the second main spindle nut 140.

[0046] In addition, the clamping device 100 has a guide rail 160, and the first main spindle nut 130 is guided along the main spindle longitudinal axis 310 by means of the guide rail. The first main spindle nut 130 can move linearly and is rotationally supported in the guide rail 160. Preferably, the guide rail 160 has a groove 162, and the guiding section 132 of the first main spindle nut 130 is received in the groove. Preferably, the groove 162 has an undercut, and the guiding section 132 extends into it. In this way, it is possible to prevent the guiding section 132 from slipping out of the guide rail 160 in a spatial direction transverse to the main spindle longitudinal axis 310. Particularly preferably, it is arranged that the profile of the guiding section 132 corresponds to the profile of the groove 162 formed in the guide rail 160 in a cross-section oriented orthogonally to the main spindle longitudinal axis 310. Purely by way of example, in Figure 1 the groove 162 is shown as a T-shaped groove.

[0047] Preferably, the clamping device 100 has an adjusting device 180, on which the drive device 120 and the guide rail 160 are supported. The adjusting device 180 is arranged to set the drive device 120 and the guide rail 160 and thus the thread spindle 110 and the components directly or indirectly arranged on the thread spindle, in particular the clamping arm 150, with respect to the main spindle longitudinal axis 310 according to the extension length of the workpiece 200 along the main spindle longitudinal axis 310. Preferably, the adjusting device 180 is set on the workpiece 200 to be clamped such that in Figure 1 and Figure 2 the clamping position 330 of the clamping arm 150 and the first coupling arm 172 and the second clamping arm 174 shown is oriented perpendicular to the main spindle longitudinal axis 310 (see also Figure 2 ).

[0048] Preferably, the adjusting device 180 is supported on the base plate 190.

[0049] Figure 2 The clamping device 100 shown is illustrated in a side view. As Figure 1 shown in Figure 1As shown, in Figure 2 the clamping device 100 is also in the clamping position 330 in the view shown in Figure 2 As can be seen in Figures 2 to 4 it is preferably provided that the adjusting device 180 has an upper plate 184, a lower plate 186 and a plurality of adjusting cylinders 182 arranged between the upper plate 184 and the lower plate 186.

[0050] Figure 3 The Figure 1 and Figure 2 shown in the open position 320 of the clamping device 100 shown in

[0051] Figure 4 The Figure 1 and Figure 2 shown in the exemplary semi-open position 322 of the clamping device 100 shown in Figure 4 In the semi-open position 322 shown in

[0052] If, for example, no adjusting device 180 is provided and a workpiece 200 is provided that extends along the main spindle longitudinal axis 310 longer thanFigures 1 to 4 the workpiece 200 shown is further away, then Figure 4 the semi-open position 322 shown can be used as the clamping position 330. As Figure 5 shown, in such a clamping position 330, the connecting device and the clamping arm 150 - as described in Figure 4 - are not oriented perpendicular to the spindle longitudinal axis 310, which is different from the Figure 1 and Figure 2 shown clamping position 330. To ensure that the clamping finger 152 can still fit on the workpiece 200 at the pivoting position of the clamping arm 150 without colliding with the rest of the clamping arm 150, the workpiece 200 must be further away from the clamping device 100 than in the Figures 1 to 4 shown configuration. In summary, compared with the Figure 1 and Figure 2 shown configurations, the reliability of clamping the workpiece 200 in this way is lower.

[0053] Figure 6 shows Figures 1 to 5 the details of the clamping device 100 shown. The preferred drive device 120 has an electric motor 122, which is coupled to the threaded spindle 110. In this way, the threaded spindle 110 can be driven to rotate by the electric motor 122. The drive device 120 also has a current monitoring device 124, which monitors the torque applied by the electric motor 122.

Claims

1. A clamping device (100) for clamping a workpiece (200), comprising: A thread spindle (110) extending along a spindle longitudinal axis (310) and having a first thread section (112) with a first thread pitch and a second thread section (114) with a second thread pitch, the second thread pitch being configured differently than the first thread pitch, wherein: A first spindle nut (130) is engaged with the first threaded section (112), and a second spindle nut (140) is engaged with the second threaded section (114); a guide rail (160) extending parallel to the spindle longitudinal axis (310) and on which the threaded spindle (110) is rotatably mounted, wherein the first spindle nut (130) is linearly movable and rotationally fixedly mounted on the guide rail (160); a clamping arm (150) which is supported on the second spindle nut (140) so as to be pivotable about a second pivot axis (302); and A connecting device, which is supported on the first spindle nut (130) so as to be pivotable about a first pivot axis (301) and is supported on the clamping arm (150) so as to be pivotable about a third pivot axis (303), wherein the first, the second and the third pivot axes (301; 302; 303) are oriented parallel to each other and the third pivot axis (303) is arranged spaced apart from the second pivot axis (302).

2. The clamping device (100) according to claim 1, characterized in that A drive device (120) is provided, by means of which the threaded spindle (110) can be driven.

3. The clamping device (100) according to claim 2, characterized in that The drive device (120) has an electric motor (122) and a current monitoring device (124) for monitoring a torque applied by the electric motor (122).

4. The clamping device (100) according to one of the preceding claims, characterized in that The first thread section (112) has a greater pitch than the second thread section (114).

5. The clamping device (100) according to one of the preceding claims, characterized in that The first thread section (112) and the second thread section (114) have the same thread direction.

6. The clamping device (100) according to one of the preceding claims, characterized in that The guide rail (160) has a groove (162) in which a guide section (132) of the first spindle nut (130) is received in a linearly movable manner.

7. The clamping device (100) according to one of the preceding claims, characterized in that The first thread section (112) and the second thread section (114) are separated from one another by means of a non-threaded shoulder (116) of the thread spindle (110).

8. The clamping device (100) according to one of the preceding claims, characterized in that The clamping arm (150) further comprises a first arm section (154) and a second arm section (156), between which a recess (158) penetrating the clamping arm (150) is arranged, wherein the first arm section (154) and the second arm section (156) preferably at least partially surround the second spindle nut (140).

9. The clamping device (100) according to one of the preceding claims, characterized in that The connecting device has a first coupling arm (172) and a second coupling arm (174), wherein the first coupling arm (172) and the second coupling arm (174) are preferably oriented parallel to each other, wherein the first coupling arm (172) and the second coupling arm (174) preferably surround the clamping arm (150).

10. The clamping device (100) according to one of the preceding claims, characterized in that An adjusting device (180) is provided, by means of which the height of the threaded spindle (110) and preferably the guide rail (160) relative to a base plate (190) along the spindle longitudinal axis (310) can be adjusted so that in the clamping position (330) the connecting device and / or the clamping arm (150) are oriented perpendicular to the spindle longitudinal axis (310).

11. The clamping device (100) according to one of the preceding claims, characterized in that The first spindle nut (130) is designed so that the third pivot axis (303) lies in a pivot plane oriented transversely to the spindle longitudinal axis (310), which is arranged spaced apart from the first spindle nut (130) in the direction of the second spindle nut (140).

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