DE102022110661B3 - Quick release device and clamping system - Google Patents

Abstract

The invention relates to a quick-action clamping device (16) and a clamping system (15) with a quick-action clamping device (16). The quick-action clamping device (16) is set up to clamp a foot part (18) of a workpiece holding unit (17). The quick-release device (16) has a base unit (21), several clamping elements (32) and a rotary ring (46) for actuating or operating the quick-release device (16). The rotary ring is movably coupled to the tensioning elements (32) via slides (40) which are movably guided radially on the base unit (21). The rotating ring (46) is rotatably mounted on the base unit (21) about a central axis (M). The coupling between the slides (40) and the rotating ring (46) takes place via guide links (48) on the rotating ring (46). A force-generating device (55) can generate a torque on the rotating ring (46), which in turn is due to the coupling with the clamping elements (32) is converted into a clamping force (FS) with which the clamping elements (32) act on the foot part (18) of the workpiece holding unit (17) in their respective clamping position (CP).

Description

The invention relates to a quick-clamping device and a clamping system having a quick-clamping device and a workpiece holding unit with a foot part which can be arranged in the quick-clamping device and releasably clamped or clamped.

Optionally, a reference unit with a reference body and a reference body holder can be present for the clamping system or the quick-clamping device. The reference body holder can be arranged off-centre on the quick-action clamping device and can be arranged detachably thereon.

Lathe chucks, clamping chucks and other workpiece holding devices for receiving workpieces to be machined and/or measured are known in a large number of embodiments. For example describes DE 20 2014 004 713 U1 a clamping system with several radially movable clamping jaws. The clamping jaws can be moved radially to a clamping axis via a gear with a plan spiral.

DE 103 17 339 A1 discloses a clamping system for clamping workpiece pallets that carry a workpiece, in which the workpiece pallets have clamping pins for this purpose, which protrude on the underside and are subjected to a clamping force by a clamping means. The clamping force pulls the pallet against a support surface of the clamping system.

A holder for a workpiece, in particular an optical workpiece, which is set up for clamping in a lathe chuck or chuck is made DE 10 2018 111 368 B3 known.

EP 1 640 094 B1 discloses a three-point support with balls and V-shaped positioning recesses for positioning the workpiece holding unit. Such three-point supports are known per se, for example from U.S. 6,072,569 A .

EP 1 640 094 B1 discloses a clamping system in which there is a workpiece holding unit that can be placed on a table. A positioning arrangement with three positioning indentations distributed around an axis in the circumferential direction is present on the table. A ball, which is arranged on the underside of the workpiece holding unit, can engage in each positioning depression. As a result, the workpiece holding unit can be positioned on the table of a measuring device by its own weight. The disadvantage here is that holding the workpiece holding unit due to its own weight is not suitable for high-precision applications, particularly in measuring machines, for all workpieces, particularly for large or projecting workpieces that can transfer a tilting moment to the workpiece holding unit. Measurements, in particular in the sub-micrometer range, on a workpiece held in the workpiece holding unit cannot easily be carried out with the required accuracy.

DE 20 2014 004 713 U1 describes a clamping system for a workpiece on a measuring machine with a multi-jaw chuck. The clamping jaws are in engagement with a spiral which is rotatably mounted. The multi-jaw chuck can be clamped or released in this way.

The company Retter offers a clamping unit (https://www.retter.de/de/spanneinheit.html). The clamping unit has a clamping ring with three clamping elements each pivotable about a pivot axis extending substantially parallel to a clamping axis (central axis of the clamping ring), the workpiece holding unit being arranged in the clamping unit along the clamping axis. A foot part of the workpiece holding unit is elastically loaded by the clamping elements and held with an axial clamping force. In this known clamping system, a force can be generated in the circumferential direction on the foot part of the workpiece holding unit by the pivoting movement of the clamping elements when the clamping elements are moved from a release position into the clamping position. The peripheral force thereby exerted on the foot part of the workpiece holding unit is regarded as disadvantageous for maintaining the positioning accuracy of the workpiece holding unit in the quick-action clamping device. In addition, the space required for the quick-release device is relatively large. The spring-elastic generation of the clamping force leads to clamping, the accuracy of which depends on the magnitude of the clamping force or the spring characteristics. In addition, holding down and fixing solely by the elastically pressed spring force in the axial direction is particularly disadvantageous for workpieces where a large tilting moment is to be expected, ie for workpieces with a large mass and/or a large length. The rigidity of the fixation of the workpiece is often insufficient in such cases.

Out of DE 3807914 C2 a clamping device with clamping holes in a base plate is known, with the base body of the clamping device being able to be locked without play in the clamping holes by means of a ball lock. A method for configuring a device for positioning components on a machine is in DE 197 08 762 B4 described. In this case, column-like supporting elements are adjusted in height in order to support a body to be measured in a predetermined position.

DE 10 2015 114 212 A1 discloses an arrangement for clamping a rotatable workpiece. A sleeve can be operated with one hand between a clamping position and a release position. For this purpose, the quill is rotatably mounted in a tailstock. The movement of the quill between the release position and the clamping position is specified via a slotted guide.

In the DE 10 2018 007 050 A1 described centering interface of a workpiece change carrier has a table adapter and a workpiece receiving base. The table adapter can be connected to a measuring table of a measuring machine. Three support points are formed for positioning between the table adapter and the measuring table, each of which is configured differently.

DE 60 2004 006 600 T2 discloses a tool changing device with an adapter for attachment to a coordinate measuring machine. A tool holder can be arranged in a statically determined manner using positioning surfaces.

In WO 91/06396 A2 describes a coordinate measuring machine that has a rotary table. The turntable has a base attached to a base. A support plate is rotatably mounted on the base plate. For this purpose, a plurality of balls are arranged in a circle around the axis of rotation. Adjacent balls form V-shaped grooves. Bodies are arranged on the support plate of the turntable, which engage in the V-shaped spaces between the balls, so that a six-point support is achieved.

DE 10 2016 118 572 A1 discloses a reference body arranged on a rotary table outside (decentrally) of a chuck receptacle. The reference body preferably consists of a sphere as the actual reference and a shaft attached to it, which has a threaded section for attachment at the opposite end.

A generic quick-release device and a generic clamping system is in DE 20 2021 104 671 U1 described. The quick-action clamping device has a base unit with a plurality of clamping elements, which are distributed around a central axis in the circumferential direction. The clamping elements are movable between a release position and a clamping position. A foot part of a workpiece holding unit can be positioned exactly in the quick-action clamping device by means of a positioning arrangement.

Out of DE 10 2014 111 576 A1 shows a clamping device for clamping a workpiece. The clamping device has a ring-shaped clamping unit with clamping jaws, which are slidably arranged in radially running grooves. The clamping jaws can be clamped using a respective sliding block. Clamping bolts that are prestressed radially outwards are guided in link tracks and can be moved out of their clamped position along a link track at an angle to the circumferential direction and at an angle to the radial direction.

Proceeding from the prior art, it is an object of the invention to provide an improved quick-action clamping device that can be operated easily for clamping and releasing a workpiece holding unit and requires only little space, in particular has a low overall height. In addition, a high rigidity of the support of the clamped workpiece holding unit should be achieved. Improved referencing of the axis of rotation in the coordinate system of the measuring machine should preferably also be made possible.

This problem is solved by a quick-release device with the features of patent claim 1 or a clamping system with the features of patent claim 13 .

The quick-action clamping device according to the invention has a base unit on which several clamping elements are arranged. The clamping elements are distributed in a circumferential direction around a central axis, preferably along a common circular path. Each clamping element is movable between a release position and a clamping position. In the clamping position, the relevant clamping element applies a clamping force to a workpiece holder to be clamped. The clamping force is the force or force component oriented parallel to the central axis in an axial direction. In the clamping position, force components can possibly also be generated at right angles to the axial direction, but their amounts are significantly lower compared to the amount of the clamping force.

A plurality of slides are movably mounted on the base unit at right angles to the central axis (ie in the radial direction) or at right angles to the axial direction. Each slide is movably coupled to one of the clamping elements and preferably to exactly one of the clamping elements. A movement of the relevant slider towards or away from the central axis causes a relevant movement of the clamping element in the direction of the clamping position or in the direction of the release position. For example, a linear movement of the slide can be transformed by the coupling into a pivoting movement of the clamping element between the release position and the clamping position.

A rotary ring of the quick-action clamping device is mounted so that it can rotate about the central axis. It can be rotated between a home rotation position and a working rotation position. The initial rotational position is the release position of the clamping elements and the working rotational position is assigned to the clamping position of the clamping elements.

A movement coupling is produced between the rotary ring and the slides, so that the slides assume a slide position along their path of movement, which position depends on the rotary position of the rotary ring. There are several guide links on the rotary ring. By means of each of the guide links, an assigned slide is mounted in a guided manner. In one exemplary embodiment, each guide slot is implemented as a cutout or groove on the rotary ring. As an alternative to this, it is also possible to form the guide links by means of a different design of protruding guide projections or guide rails. At least part of each slide is designed as a sliding block which is in engagement with the associated guide link.

The rotary ring can be mounted in a floating manner relative to the base unit, so that it can be moved parallel to a bearing plane, the bearing plane being oriented at right angles to the central axis. In addition or as an alternative, the floating bearing can also allow the rotary ring to tilt or tilt in relation to the bearing plane.

In a first aspect of the quick-release device according to the invention, each guide link has a first link section and a second link section. Each guide link preferably has only two link sections. The first link section and the second link section preferably directly adjoin one another. The direction of progression or direction of extent of the guide link and thus of the link sections can be defined by a center line of the guide link. The first link section has a profile that is aligned obliquely to the circumferential direction. The first link section can extend linearly or non-linearly (e.g. in an arc). Viewed relative to the circumferential direction, the second link section has a slope or an extension that differs from the first link section.

The first link section and/or the second link section do not run exclusively in the radial direction and/or exclusively in the circumferential direction.

When the tensioning elements are in the release position and the rotary ring assumes the initial rotary position, the slides are each coupled to a first gate section. In particular, the slides are in a position at an end of the first link section which is remote from the second link section or opposite the second link section. The rotary ring is then in the initial rotary position.

In the clamped position, the slides are coupled to the second link section of the respective guide link. The rotating ring is then in the working rotating position.

The design of the quick-release device according to the first aspect of the invention requires only little installation space and can be built compactly, in particular in the axial direction parallel to the central axis. The rotary ring serves as a control element for manual operation and/or for automated operation. All clamping elements can be moved quickly and easily between the release position and the clamping position using the rotating ring. Due to the different gradients of the connecting link sections, it is possible to keep the entire rotary position range of the rotary ring between the initial rotary position and the working rotary position small and also to implement a translation that causes self-locking in the clamping position of the clamping elements. Only small forces are required to rotate the rotating ring in the area of the working rotating position of the rotating ring and the respective clamping position of the clamping elements.

In principle, it is preferred if the guide links are identical, in particular with regard to the alignment of the link sections relative to the radial direction and/or the circumferential direction about the central axis. In one exemplary embodiment, at least two of the existing guide links can differ from one another, in particular with regard to the orientation of the link sections relative to the radial direction and/or the circumferential direction about the central axis.

It is preferred if the second link section runs at least partially obliquely to the circumferential direction. The second link section can have a non-linear and, in particular, arcuate course. The course deviates from a course in the circumferential direction. As a result of this non-linear and, in particular, arc-shaped course, the contact or coupling point between the rotating ring and the associated slide also changes depending on the rotational position of the rotating ring. As a result of this, the transmission ratio between a torque acting on the rotary ring and the radial force generated by the slides on the clamping elements and thus also the clamping force generated by the clamping elements changes. By a non-linear, in particular The arcuate course of the second connecting link section, which does not coincide with the circumferential direction, can at least partially compensate for changes in the generation of the clamping force for the individual clamping elements.

In one embodiment, the first link section has a linear course.

In one exemplary embodiment, the slope or the slope angle of a link section relative to the circumferential direction is greater at any point on the first link section than at any point on the second link section. The pitch angle is defined at each point of the guide link between a center line of the guide link and a tangent to the circumferential direction at the point considered in each case. If the center line of the guide slot has an arcuate course, the gradient angle between the tangent to the circumferential direction and the tangent to the center line is determined.

To generate the clamping force, the quick-action clamping device has a force-generating device. To generate the clamping force, the force-generating device is coupled to the clamping elements via the rotating ring and the slides. The force-generating device generates a torque in the circumferential direction on the rotating ring, which, due to the movement coupling, causes a thrust force on the slides and thus in turn a tensioning force exerted by the tensioning elements. The force-generating device can have one, and in particular precisely one, force-generating unit for each tensioning element.

The at least one force-generating unit can, for example, exert a tensile force on the rotary ring.

The force-generating device, and in particular each force-generating unit, has a force-generating element that forces the rotary ring into its initial rotary position in a first rotary position range. The at least one force-generating element can additionally or alternatively act on the rotary ring in a second rotary position range of the rotary ring in such a way that it is pushed into its working rotary position. A bistable quick-action clamping device, so to speak, can thus be achieved.

It is preferred that the slides are coupled to the first link section of the respective guide link when the rotary ring is in the first rotary position range. Additionally or alternatively, the rotating ring is in the second rotational position range when the slides are coupled to the second link section of the respective guide link. At a transitional position of the sliders, the first rotational position range is adjacent to the second rotational position range. The transitional position of the slides can be in the first gate section or at the point at which the first gate section merges into the second gate section.

In a preferred embodiment, the force generating device and preferably each force generating unit has a pivoting lever. Each pivoted lever is pivoted about a lever bearing axis. The lever bearing axis preferably extends in the axial direction. At a distance from the lever bearing axis, each pivoting lever is connected or coupled to an associated force-generating element. In addition, each pivoting lever can be coupled to the rotary ring at a distance from its lever bearing axis in order to transmit the force of the force-generating element to the rotary ring. The coupling between the rotary ring and the pivoting lever can be realized, for example, via an extension which moves about the pivot bearing axis during a pivoting movement of the pivoting lever and at the same time moves relative to the rotary ring. The extension can, for example, be a link element or sliding block of a link guide.

It is preferred if each force-generating element generates an initial force, so that a torque acts on the associated pivoting lever about the lever bearing axis, at least when the initial force has no direction that intersects the lever bearing axis. If the direction vector of the initial force intersects the lever bearing axis, no torque acts on the pivoted lever. This position corresponds to the transition point between the first rotational position range and the second rotational position range of the rotary ring. If the direction of the initial force is offset from the lever bearing axis, a torque acts on the swivel lever, which can have different torque directions and thus forces the rotary ring either in the direction of the initial rotary position or in the direction of the working rotary position, so that the clamping elements either move in the direction of their release position or in the direction of their Clamping position to be pushed.

It is preferred if each clamping element is supported inelastic in the clamping position in an axial direction parallel to the central axis and/or in a radial direction radial to the central axis. An inelastic support is to be understood as meaning a support in which there is no elastic change in position of the clamping element when forces or moments act on the clamping element which occur when the quick-action clamping device is used properly.

In one embodiment, the clamping elements can each be pivoted about a pivot axis which is oriented in a direction which in turn is oriented at right angles to the central axis. The movement of the clamping elements between the release position and the clamping position is effected by a pivoting movement and preferably only a pivoting movement about the respective pivot axis.

In addition or as an alternative to one of the above exemplary embodiments according to the first aspect of the quick-release device according to the invention, the quick-release device can also be designed according to a second aspect of the invention. In this embodiment, analogously to one of the previous exemplary embodiments, the quick-action clamping device has a base unit, a plurality of clamping elements arranged on the base unit and a plurality of slides mounted on the base unit. In addition, according to the second aspect of the present invention, the quick release mechanism has a rotating ring. The configuration and/or arrangement and/or mounting of the rotary ring and/or the tensioning elements and/or the slide can correspond to any exemplary embodiment of the first aspect of the invention.

The quick-release device according to the second aspect of the invention also has a force-generating device that is coupled to the rotating ring and is set up to generate an initial force. Due to the initial force, a torque can be exerted on the rotary ring, which can be converted into the clamping force due to the coupling between the rotary ring and the slides on the one hand and the slides and the clamping elements on the other hand, which acts in the clamping position between each clamping element and a workpiece holder to be clamped. The force-generating device can be implemented according to any exemplary embodiment of the first aspect of the quick-release device according to the invention.

A clamping system has a quick-clamping device according to any exemplary embodiment and a workpiece holding unit. The workpiece holding unit is configured to hold a workpiece. The workpiece holding unit has a foot part, by means of which the workpiece holding unit can be clamped in the quick-action clamping device. The foot part preferably has a plurality of positioning bodies on an underside, which are set up to work together with a positioning arrangement of the quick-action clamping device. On the upper side opposite the underside, the foot part has a clamping surface for each clamping element.

By means of the positioning body and the positioning arrangement, the foot part and thus the workpiece holding unit are positioned relative to the quick-action clamping device and arranged in a desired alignment.

Independently of other aspects of the quick-action clamping device and the clamping system, a reference unit having a reference body for the quick-action clamping device can be provided. The reference unit can be part of the clamping system. The reference body can preferably be positioned or adjusted in the axial direction on a reference body holder. The reference body holder is preferably set up to be detachably arranged on the quick-action clamping device, in particular without tools, for example by means of a magnetic connection.

• 1 eine perspektivische Teildarstellung einer Messmaschine sowie einem Spannsystem aufweisend ein Ausführungsbeispiel einer erfindungsgemäßen Schnellspanneinrichtung sowie eine Werkstückhalteeinheit und eine optionale Referenzeinheit in einer perspektivischen Teildarstellung,
• 2 ein Ausführungsbeispiel einer erfindungsgemäßen Schnellspanneinrichtung in einer perspektivischen Darstellung,
• 3 ein Ausführungsbeispiel eines Fußteils einer Werkstückhalteeinheit in einer perspektivischen Darstellung,
• 4 das Fußteil der Werkstückhalteeinheit aus 2 in einer Seitenansicht,
• 5 einen Schnitt durch ein Spannsystem entlang einer Mittelachse in perspektivischer Darstellung, wobei das Spannsystem eine Werkstückhalteeinheit mit Fußteil gemäß den 3 und 4 sowie eine Schnellspanneinrichtung gemäß 2 aufweist,
• 6 einen anderen Schnitt durch das Spannsystem gemäß 5 versetzt zur Mittelachse in perspektivischer Darstellung,
• 7 eine Explosionsdarstellung eines Ausführungsbeispiels einer erfindungsgemäßen Schnellspanneinrichtung sowie einer optionalen Referenzeinheit,
• 8 einen Drehring, einen Basisring und Spannelemente einer erfindungsgemäßen Schnellspanneinrichtung in einer perspektivischen Ansicht, wobei sich die Spannelemente in einer Freigabeposition befinden,
• 9 die Bestandteile der Schnellspanneinrichtung aus 8 in einer Draufsicht entlang der Mittelachse,
• 10 einen Drehring, einen Basisring und Spannelemente einer erfindungsgemäßen Schnellspanneinrichtung in einer perspektivischen Ansicht, wobei sich die Spannelemente in einer Spannposition befinden,
• 11 die Bestandteile der Schnellspanneinrichtung aus 10 in einer Draufsicht entlang der Mittelachse,
• 12 und 13 jeweils eine Prinzipdarstellung einer Krafterzeugungseinheit in unterschiedlichen Positionen und Zuständen,
• 14 eine Teildarstellung einer erfindungsgemäßen Schnellspanneinrichtung im Bereich eines Spannelements in Draufsicht,
• 15 eine schematische Prinzipdarstellung eines Ausführungsbeispiels eines Spannelements einer erfindungsgemäßen Schnellspanneinrichtung in einer Freigabeposition,
• 17 eine Draufsicht auf ein Ausführungsbeispiel einer Schnellspanneinrichtung aufweisend eine Basiseinheit und einen Drehring,
• 18 eine perspektivische Explosionsdarstellung einer Referenzeinheit, bestehend aus einem Referenzkörper und einer Referenzkörperhalterung, wobei die Referenzkörperhalterung zum Anbringen an der Basiseinheit einer erfindungsgemäßen Schnellspanneinrichtung eingerichtet ist,
• 19 eine schematische Schnittdarstellung durch einen Bereich einer Montageplatte und einer Adapterplatte der Referenzkörperhalterung aus 18 und
• 20 bis 23 jeweils eine perspektivische Darstellung eines Ausführungsbeispiels einer Werkstückhalteeinheit.

Advantageous configurations of the invention result from the dependent claims, the description and the drawing. Preferred exemplary embodiments of the invention are explained in detail below with reference to the attached drawing. Show in the drawing:

• 1 a perspective partial view of a measuring machine and a clamping system having an embodiment of a quick-action clamping device according to the invention and a workpiece holding unit and an optional reference unit in a perspective partial view,
• 2 an embodiment of a quick release device according to the invention in a perspective view,
• 3 an embodiment of a foot part of a workpiece holding unit in a perspective view,
• 4 the base part of the workpiece holding unit 2 in a side view,
• 5 a section through a clamping system along a central axis in a perspective view, the clamping system having a workpiece holding unit with a foot according to the 3 and 4 and a quick-release device according to 2 having,
• 6 according to another section through the clamping system 5 offset to the central axis in a perspective view,
• 7 an exploded view of an embodiment of a quick-release device according to the invention and an optional reference unit,
• 8th a rotating ring, a base ring and clamping elements of an inventive Quick-release device in a perspective view, with the clamping elements in a release position,
• 9 the components of the quick-release device 8th in a plan view along the central axis,
• 10 a rotary ring, a base ring and clamping elements of a quick-release device according to the invention in a perspective view, with the clamping elements being in a clamping position,
• 11 the components of the quick-release device 10 in a plan view along the central axis,
• 12 and 13 a schematic diagram of a force-generating unit in different positions and states,
• 14 a partial representation of a quick-release device according to the invention in the area of a clamping element in plan view,
• 15 a schematic basic representation of an embodiment of a clamping element of a quick-release device according to the invention in a release position,
• 17 a plan view of an embodiment of a quick-release device having a base unit and a rotary ring,
• 18 a perspective exploded view of a reference unit, consisting of a reference body and a reference body holder, wherein the reference body holder is set up for attachment to the base unit of a quick-release device according to the invention,
• 19 a schematic sectional view through an area of a mounting plate and an adapter plate of the reference body holder 18 and
• 20 until 23 each a perspective view of an embodiment of a workpiece holding unit.

1 shows a measuring machine 10 in a perspective partial representation. The measuring machine 10 has a probe device 11 with a probe element 12. The probe element 12 can be used for tactile and/or non-contact probing of a workpiece, not shown, in order to measure features of the workpiece.

A clamping system 15 is used to clamp the workpiece in the measuring machine 10 . The clamping system 15 has a quick-action clamping device 16 and a workpiece holding unit 17 . The workpiece to be measured is arranged on the workpiece holding unit 17 . The workpiece holding unit 17 thus indirectly establishes the connection between the workpiece and the quick-action clamping device 16 . The workpiece holding unit 17 can have holding means which are adapted to the respective geometry, size and configuration of the workpiece.

The clamping system 15 can have several different exemplary embodiments of the workpiece holding unit 17 ( 1 and 20-23) to be able to hold different workpieces. Each workpiece holding unit 17 has a foot part 18 . The foot parts 18 of each workpiece holding unit 17 can be constructed essentially identically and represent the connection interface to the quick-action clamping device 16. The different workpiece holding units 17 can thus be quickly and easily positioned and clamped in the quick-action clamping device 16 by means of the foot part 18.

The foot part 18 has a plurality of positioning bodies 19 on an underside. In the exemplary embodiment, three positioning bodies 19 are arranged in a circumferential direction around a central axis Z of the foot part 18, preferably arranged evenly distributed. The positioning body 19 of the foot part 18 are particularly in the 3 and 4 to recognize. In the exemplary embodiment, they are formed by cylinder bodies or cylinder pins, the cylinder axes of which extend radially to the central axis Z. The cylinder bodies can be arranged in recesses or grooves on the foot part 18 .

At least one section of each positioning body 19 protrudes from the underside of the foot part 18 and can be positioned with this section in an associated positioning recess 20 ( 6 ) of the quick release device. The quick-action clamping device 16 has an associated positioning depression 20 for each positioning body 19 . The positioning depressions 20 are distributed in a circumferential direction U about a center axis M of the quick-release device 16 and are distributed regularly according to the example. In the exemplary embodiment, the positioning depressions 20 are arranged on a base unit 21 of the quick-action clamping device 16 . The base unit 21 and in particular the positioning recesses define or define the central axis M of the quick-release device 16. The direction parallel to the central axis M is referred to as the axial direction A and a direction of rotation or rotation about the central axis M is referred to as the circumferential direction U (e.g 2 ).

Each positioning recess 20 can be formed between two cylindrical or spherical bodies arranged next to one another in the circumferential direction U. In the embodiment, the Base unit 21 three pairs of balls 22 on. Each pair of balls 22 defines one of the positioning recesses 20 therebetween 2 , 6 and 7 can be seen, the balls 22 are arranged in a base plate 23 of the base unit 21 .

Instead of using balls 22 or other bodies, the positioning depressions 20 can also be realized in a different way in the base plate 23, for example in the form of groove-shaped depressions, which are aligned in particular radially to the central axis M and have groove flanks arranged at an angle to one another in cross section - the grooves can thus be V-shaped.

According to the example, the base unit 21 includes a base ring 24 which extends coaxially around the central axis M. The base ring 24 is fixed to the base plate 23, for example by a screw connection ( 7 ). The base ring 24 encloses an inner region 25 in the circumferential direction U, in which the foot part 18 of the workpiece holding unit 17 can be arranged. In the axial direction A, the inner region 25 is open on one side for the insertion of the foot part 18 and is delimited by the base plate 23 on the other side. The positioning depressions 20 are accessible from the interior 25 .

The base ring 24 and base plate 23 may be separate components or may be monolithically formed as a single component.

The quick-action clamping device 16 also has a means or a device to define the relative rotational position between the workpiece holding unit 17 and the quick-action clamping device 16 . For this purpose, a projection 26 is present on the base unit 21 in the exemplary embodiment, which protrudes laterally and, according to the example, radially into the inner region 25 . In the exemplary embodiment, the projection 26 has a part-cylindrical and, for example, semi-cylindrical shape. Its cylinder axis is aligned in the axial direction A. The projection 26 of the base unit 21 could also have any other contour.

On the foot part 18 there is an edge recess 27 adapted to the cross-sectional contour of the projection 26 . The edge recess 27 completely penetrates the foot part 18 parallel to the central axis Z and is open radially to the central axis Z to the outside in the exemplary embodiment. The edge recess 27 has a cross-sectional contour which is the same as or slightly larger than the cross-sectional contour of the projection 26.

To position and align the workpiece holding unit 17 on the quick-action clamping device 16, the foot part 18 is inserted into the inner area 25. The positioning bodies 19 reach the respective associated positioning recess 20 of the base unit 21, so that the foot part 18 is aligned in a statically determined manner with respect to the base unit 21. The positioning bodies 19 are assigned to the respective positioning recess 20 by the projection 26 and the edge recess 27. The exact rotational position of the foot part 18 about the central axis M of the quick-release device 16 is defined, for example, by the interaction of the positioning bodies 19 with the positioning recesses 20.

When the connection between the foot part 18 and the base unit 21 is established, a free space can remain between the projection 26 and the foot part 18 in the area of the projection 26 or the edge recess 27 . In a modification to this, it is also possible for the projection 26 to bear against the foot part 18 at one or more points. In all embodiments, there is the possibility that a torque about the central axis M between the workpiece holding unit 17 and the quick-action clamping device 16 can be supported on the projection 26 in order to avoid relative rotation.

In modified exemplary embodiments, the projection 26 can also be present on the foot part 18 and the edge recess 27 on the base unit 21 and in particular the base ring 24 .

In the exemplary embodiment, the quick-action clamping device 16 also has clamping elements 32 distributed (in particular regularly distributed) around the central axis M, for example three clamping elements 32. Each clamping element 32 can be moved between a release position RP and a clamping position CP. In the release position RP, the clamping elements 32 can completely release access from above to the inner area 25--they are then arranged in particular offset radially outwards from the inner area 25. As an alternative to this, in the release position RP they can also engage in the inner area 25 and/or be positioned above the inner area. In any case, a sufficiently large free space between the clamping elements 32 for inserting and removing the foot part 18 in or from the inner area 25 is ensured when the clamping elements 32 are in the respective release position RP of FIG.

In the exemplary embodiment, the movement between the release position RP and the clamping position CP is a pivoting movement about a pivot axis S. In the exemplary embodiment, the pivot axis S of each clamping element 32 extends at right angles to the central axis M and offset from the central axis M. The pivot axes S are in a common radial plane to the central axis M ange arranges. For example, they extend tangentially to the circumferential direction U.

In the 15 and 16 a schematic representation of the mode of operation of the clamping elements 32 is shown in each case. 15 shows a clamping element 32 in the release position RP and 16 shows the clamping element 32 in the clamping position CP.

In the exemplary embodiment, each tensioning element 32 is formed by two legs connected to one another at an angle or at right angles. A first leg 33 is mounted pivotably about the pivot axis S at one end. At its end opposite the pivot bearing, the first leg 33 is connected to a second leg 34 . The two legs 33, 34 can be monolithic. The second leg 34 carries a clamping body 35. The clamping body 35 is designed to rest against an associated clamping surface 36 of the foot part 18 in the clamping position CP and to generate a clamping force F on the foot part 18, with which the foot part 18 is placed between the clamping element 32 and the base unit 21 (example according to the base plate 23) is clamped.

The clamping body 35 preferably has a convex-shaped outer surface, for example a spherical outer surface. The clamping body 35 can be formed by a portion of a ball which projects away from the second leg 34, the ball being fixed to the second leg 34.

The clamping elements 32 are distributed uniformly around the central axis M in the circumferential direction U. In order to pivot each tensioning element 32 about the pivot axis S, each tensioning element 32 is movement-coupled to a slide 40 . The slide 40 is mounted on the base unit 21 and, for example, on the base ring 24 so that it can be displaced linearly in a radial direction R radially to the center axis M. For this purpose, the slide 40 in the exemplary embodiment has a component designed as a sliding block 41 which is slidably arranged in a groove of the base ring 24 .

The slide 40 also has a link element 42 which is arranged on the sliding block 41 . In the exemplary embodiment, the gate element 42 has a circular cross section perpendicular to the axial direction A, at least in one area or section. At an end opposite the sliding block 41, the link element 42 is connected to the associated clamping element 32 via at least one connecting element 43 and, for example, two connecting elements 43 in each case. Each connecting element 43 is pivotably mounted both on the tensioning element 32 and on the link element 42 . As a result, a linear movement of the slide 40 can be transformed into a pivoting movement of the tensioning element 32 . For this purpose, the connecting element 43 is pivotably mounted on the clamping element 32 at a distance from the pivot axis S, for example on the first leg 33 and in particular on the end of the first leg 33 opposite the pivot axis S.

The quick-release device 16 has a rotary ring 46 for moving and/or positioning the slide 40. The rotary ring 46 is rotatably mounted on the base unit 21. In the axial direction A, the rotary ring 46 is arranged between the base ring 24 and a cover plate 47 of the quick-action clamping device 16 in the exemplary embodiment. The cover plate 47 is immovably attached to the base unit 21, for example by means of a screw connection, as is particularly the case in 7 can be seen.

According to the example, the rotary ring 46 is arranged in a floating manner and can move at right angles to the axial direction A and/or incline or tilt relative to the axial direction A. In order to enable this movement of the rotating ring 46, the inside diameter of the rotating ring 46 is, for example, larger than the minimum inside diameter of the base ring 24 (radius difference b; 17 ). This makes it possible to compensate for deviations in the dimensions of the foot parts 18 and/or in the orientation and/or positioning of a foot part 18 to be clamped relative to the base unit 21 . As a result, the clamping bodies 35 of the clamping elements 32 can be located at different levels or different heights in the axial direction A. Therefore, the clamping body 35 can be positioned according to the deviations of the foot part 18 and thus enable a secure fixation of the foot part 18, at least within a tolerance range. In particular, height deviations in the axial direction A of the respective clamping surfaces 36 relative to one another, on which the respective clamping bodies 35 rest, can be compensated for in this way.

The slides 40 are drivingly or movement-coupled to the rotary ring 46 . For this purpose, the rotary ring 46 has a guide link 48 for each slide 40. In the exemplary embodiment, the guide link 48 is formed as a groove or recess in the rotary ring 46, into which the slide 40 protrudes or protrudes, for example with the link element 42. On the opposite side to the base ring 24 The ends of the link elements 42 to which the connecting elements 43 are fastened are arranged on the side of the rotating ring 46 (cf 8th and 10 ).

The rotary ring 46 is between an initial rotary position IP ( 8th and 9 ) and at dest to a working rotary position WP ( 10 and 11 ) rotatable around the central axis M. The working rotational position WP is predetermined by the design and arrangement of the foot part 18 and can therefore vary if the foot parts 18 deviate from the ideal target shape or if the inner area 25 is misaligned. A first rotational position range follows the initial rotational position IP. The first rotary position range is followed by a second rotary position range, which has the working rotary position WP.

• erster Drehpositionsbereich: δ_IP ≤ δ ≤ δ_U
• zweiter Drehpositionsbereich: δ_U < δ ≤ δ_WP

If the rotary position of rotary ring 46 about central axis M is described by a rotary angle δ, a rotary angle δ=δ _IP can define the initial rotary position IP. A rotation angle δ=δ _WP can define the working rotation position WP. Then the following can be defined:

• first rotational position range: δ _IP ≤ δ ≤ δ _U
• second rotational position range: δ _U < δ ≤ δ _WP

In this case, δ=δ _U is the angle of rotation that describes the transition between the first and the second range of rotational positions.

The guide link 48 has a first link section 49 and an adjoining second link section 50. In the initial rotational position IP, the link element 42 is in the first link section 49 ( 8th and 9 ) and in the working rotary position WP the link element 42 is in the second link section 50 of the associated guide link 48 ( 10 and 11 ). The initial rotational position IP is assigned to the release positions RP of the clamping elements 32, while the working rotational position WP is assigned to the clamping positions CP of the clamping elements 32.

All clamping elements 32 can be moved between the release position RP and the clamping position CP and pivoted according to the example by means of the rotary ring 46 via the coupling to the slides 40 . The rotating ring 46 is thus an operating element of the quick-action clamping device 46 and can be operated manually or by motor.

In the exemplary embodiment, the first link section 49 extends linearly and obliquely to the circumferential direction U. It does not run radially to the central axis M, but also obliquely to the radial direction R.

In the exemplary embodiment, the second link section 50 of each guide link 48 does not extend linearly, but in a curved manner and, starting from the first link section 49 , approaches the central axis M along its direction of extension. The course of the guide link or the first link section 49 and the second link section 50 is defined by a center line L ( 14 ). The center line L describes the movement path along which the gate element 42 or a center of the gate element 42 and the rotary ring 46 move relative to one another when a relative rotation of the rotary ring 46 relative to the slide 40 takes place. During this relative rotation, the slide 40 moves in the radial direction R by a distance Δr, so that the pivoting movement between the release position RP and the clamping position CP can take place due to the coupling with the clamping elements 32 . The slides 40 can be moved in the radial direction R by the maximum path length Δr _max , which results from the distance between the opposite ends of the guide link 48 and the central axis M ( 14 ).

A force-generating device 55 with at least one force-generating unit 56 is assigned to the rotary ring 46 . In the exemplary embodiment, three force-generating units 56 are present. The force-generating units 56 are distributed in the circumferential direction U around the central axis M ( 9 and 11 ). Each force-generating unit 56 has a force-generating element 57, for example a spring 58 and in particular a helical spring. In addition, each force-generating unit 56 has a pivoted lever 59 which is mounted pivotably about a lever bearing axis H. In the exemplary embodiment, the lever bearing axes H extend parallel to the axial direction A 12 and 13 illustrated. The power generation units 56 are also based on the 9 and 11 apparent.

An initial force FI is generated via the force-generating element 57 or the spring 58, which in the exemplary embodiment is a tensile force and acts on the pivoting lever 59 at a distance from the lever bearing axis H. The initial force FI acts along a straight line between the two attachment points of the spring 58, for example a first attachment point 60 on the pivot lever 59 and a second attachment point 61 on the base unit 21, which is in the 12 and 13 is only illustrated in a highly schematic manner.

If a straight line G runs between the first attachment point 60 and the second attachment point 61 offset to the lever bearing axis H, the initial force FI exerts a torque on the pivoted lever 59 . In the first rotational position range (δ _IP ≤ δ ≤ δ _U ), the straight line G is arranged between the two attachment points 60, 61 on one side of the lever bearing axis H ( 12 ) while in the second rotational position range (δ _U <δ ≤ δ _WP ) of the rotary ring 46, the straight line G between the two Attachment points 60, 61 are located on the opposite side of the lever bearing axis H ( 13 ). At the transition point between the two rotational position ranges (δ=δ _U ), the straight line G extends through the lever bearing axis H.

Thus, in the first rotational position range of the rotary ring 46, a torque is exerted on the pivoted lever 59 which is directed in one direction (here clockwise) around the lever bearing axis H, whereas in the second rotational position range of the rotary ring 46 a torque is exerted on the pivoted lever 59 which in is directed around the lever bearing axis H in the other direction (here counterclockwise). If the rotating ring 46 is located at the transition point between the first rotational position range and the second rotational position range (δ=δ _U ), the gate elements 42 of the slide 40 are arranged either in the first gate section 49 or in the transition between the first gate section 49 and the second gate section 50 .

At a distance from the lever bearing axis H and, for example, at or in the area of the first attachment point 60, each pivoted lever 59 is coupled for movement to the rotating ring 46, for example by means of an extension 62 which engages in a groove-shaped recess 63 on the rotating ring 46. The extension 62 can be designed, for example, as a pin, in particular a cylindrical pin, and extend into the recess 63 in the axial direction A, starting from the pivoted lever 59 . The recess 63 can have a rectilinear course in all of the exemplary embodiments, as is shown in FIGS 12 and 13 is shown schematically. It can extend obliquely to the circumferential direction U and obliquely to the radial direction. As a modification to this, the recess 63 can also have an angled and/or curved course, as is the case with the exemplary embodiments according to FIG 8th until 11 is illustrated. Both possible configurations can be used in all of the embodiments.

The procedure for clamping a workpiece holding unit 17 is as follows: The rotating ring 46 of the quick-action clamping device 16 is rotated into the initial rotational position IP if it is not in this position. The force generating device 55 ensures that the rotary ring 46 is held in the initial rotary position IP. The foot part 18 can then be inserted into the inner area 25 . The positioning bodies 19 and the positioning depressions 20 ensure the exact relative position and relative alignment between the foot part 18 and the base unit 21. The rotating ring is then rotated from the initial rotational position IP into the second rotational position range. In this second rotational position range, the force-generating device 55 ensures that the rotating ring 46 is brought into the working rotational position WP and held there. The clamping elements 32 are pivoted by the rotation of the rotating ring 46 from the initial rotational position IP into the working rotational position WP from the release position RP into the clamping position CP. The workpiece holding unit 17 is clamped on the quick-action clamping device 16 .

In order to remove the workpiece holding unit 17 from the quick-action clamping device 16, the rotating ring 46 is rotated from the working rotating position WP into the first rotating position range. In this first rotational position range, the force generating device 55 ensures that the rotary ring 46 is brought into the initial rotational position IP and held there. The clamping elements 32 are pivoted from the working rotational position WP to the starting rotational position IP from the clamping position CP to the release position RP by the rotation of the rotating ring 46 . The workpiece holding unit 17 is no longer clamped to the quick-action clamping device 16 and can be removed.

Like it in the 1 , 7 and 18 is illustrated, the quick-action clamping device 16 can be set up to have a reference unit 69, having a reference body 70, for example a reference sphere, and a reference body holder 71 in order to hold and position the reference body 70. The reference body holder 71 can be fastened to the quick-release device 16, for example to the base unit 21 or, as in the exemplary embodiment, to the cover plate 47 or another component connected to the base unit 21. In the exemplary embodiment, the reference body 70 is arranged on a cylindrical base 72 of the reference body holder 71 . The reference body holder 71 has a hollow-cylindrical receiving part 73 into which the base 72 can be inserted and tightened or clamped in a non-positive manner. A stopper 74 can be fixed to the base 72 at a desired position in the axial direction A to adjust the position of the reference body 70 in the axial direction A. The stop part 74 defines the depth of insertion of the base 72 into the receiving part 73 and rests against an end face of the receiving part 73 when it is fully or correctly inserted ( 1 and 7 ).

The reference body holder 71 also has an adapter plate 75 to which the receiving part 73 is attached, for example by means of a screw connection. The adapter plate 75 can be detachably connected to a mounting plate 77 of the reference body holder 71 via a connecting device 76 . The mounting plate 77 is in turn attached to the quick-release device 16 and, for example, to the cover plate 47 at for example by means of a screw connection. Alternatively, the mounting plate 77 can also be formed by a section of the cover plate 47 or another component of the quick-action clamping device 16 .

In the exemplary embodiment, the connecting device 76 is set up in particular to produce a magnetic connection between the adapter plate 75 and the mounting plate 77 ( 19 ). For this purpose, for example, the adapter plate 75 has at least one magnet 78 on its underside facing the mounting plate 77 . The mounting plate 77 is made of a ferromagnetic material such as a steel alloy. A connection force in the axial direction A can thereby be generated.

In order to achieve an exact positioning and alignment of the adapter plate 75 relative to the mounting plate 77, the connecting device 76 has positioning bodies 19 that protrude from the underside of the adapter plate 75, analogous to the quick-action clamping device 16, which engage in a positioning recess 20 of the mounting plate 77 when the connection is established (or vice versa ). the positioning recess 20 may be formed by a pair of bodies such as balls 22.

Different design options for workpiece holding units 17 are exemplary 1 and 20-23. The clamping system 15 can have a plurality of differently designed workpiece holding units 17 so that a suitable workpiece holding unit 17 can be selected and clamped in the quick-action clamping device 16 in the manner of a modular system depending on the workpiece to be measured. For example, the workpiece holding unit 17 can have a plurality of clamping jaws 80 that can be moved toward the central axis Z or away from the central axis Z. A rod-shaped or cylindrical workpiece, for example, can be clamped by means of the clamping jaws 80 ( 22 ). In an embodiment with two clamping jaws 80 ( 23 ) workpieces with two parallel outer sides can be clamped, for example. The workpiece holding units 17 with clamping jaws 80 are preferably set up to clamp workpieces centered in relation to the central axis Z, with all clamping jaws 80 each having the same distance from the central axis Z.

The workpiece holding unit 17 according to 20 has, for example, a perforated plate 81 on which workpieces can be arranged with the aid of fastening means. This perforated plate 81 has a plate recess 82 for the reference unit 69 because of its diameter, which is approximately as large as the diameter of the base unit 21 of the quick-action clamping device 16 . The rotational position of the plate recess 82 of the perforated plate 81 in the circumferential direction about the central axis M is determined by the rotational position of the foot part 18 of the workpiece holding unit 17 about the central axis M. The rotational position of the foot part 18 about the central axis M is in turn defined by the interaction of the edge recess 27 of the foot part 18 and the projection 26 of the base unit 21 . This ensures that the plate recess 82 and the location on the quick-action clamping device 16 provided for attaching the reference unit 69 match in the circumferential direction about the central axis M.

The type and number of workpiece holding units 17 present in a clamping system 15 can vary.

The exemplary embodiments described above combine several aspects of the invention. The first aspect of the invention relates to the movement coupling or drive coupling between the rotary ring 46 and the clamping elements 32 by means of the slide 40 and the guide links 48. Another independent aspect of the invention is the design of the force generating device 55 for generating the initial force FI on the rotary ring 46, which then in turn can be transformed into the clamping force FS of the clamping elements 32 when the rotary ring 46 is in a second rotary position range in its working rotary position WP. These two aspects can be used separately or in combination.

The invention relates to a quick-clamping device 16 and a clamping system 15 with a quick-clamping device 16. The quick-clamping device 16 is set up to clamp a foot part 18 of a workpiece holding unit 17 and optionally to be able to accommodate a reference unit 69 off-center. The quick-action clamping device 16 has a base unit 21, several clamping elements 32 and a rotary ring 46 for actuating or operating the quick-action clamping device 16. The rotating ring 46 is rotatably mounted on the base unit 21 about a central axis M. FIG. The coupling between the slides 40 and the rotating ring 46 takes place via guide links 48 on the rotating ring 46. In a first embodiment according to the invention, the guide links 48 have two link sections 49, 50 aligned differently from the circumferential direction U about the central axis M. In a second aspect according to the invention, a force-generating device 55 is present, which can generate a torque on the rotating ring 46, which in turn is converted into a clamping force FS due to the coupling with the clamping elements 32 is, with which the clamping elements 32 act on the foot part 18 of the workpiece holding unit 17 in their respective clamping position CP.

Reference list:

10

measuring machine

11

tactile device

12

tactile element

15

clamping system

16

quick release device

17

workpiece holding unit

18

footboard

19

positioning body

20

positioning indentation

21

base unit

22

Bullet

23

base plate

24

base ring

25

interior

26

head Start

27

edge recess

32

clamping element

33

first leg

34

second leg

35

clamping body

36

clamping surface

40

slider

41

slot nut

42

scenery element

43

fastener

46

rotating ring

47

cover plate

48

leadership backdrop

49

first scenery section

50

second scenery section

55

power generation device

56

power generation unit

57

force generating element

58

Feather

59

swing lever

60

first attachment point

61

second attachment point

62

extension

63

recess

69

reference unit

70

reference body

71

reference body mount

72

base

73

recording part

74

stop part

75

adapter plate

76

connecting device

77

mounting plate

78

magnet

80

clamping jaw

81

perforated plate

82

panel recess

δ

Angle of rotation of the rotating ring around the central axis

δIP

Rotation angle of the initial rotation position

δWP

Rotation angle of the working rotation position

δU

Rotational angle of the transition between the first and second rotational position range

Δr

path length

Δrmax

maximum path length

A

axial direction

b

radius difference

CP

clamping position

FS

resilience

FI

initial power

H

lever bearing axle

IP

initial rotation position

L

centerline

M

central axis

RP

release position

S

pivot axis

u

circumferential direction

WP

working turning position

Z

central axis of the foot part

Claims (13)

Quick-release device (16) having: - a base unit (21), - a plurality of clamping elements (32) distributed on the base unit (21) in a circumferential direction (U) around a central axis (M), each clamping element (32) being movable between a release position (RP) and a clamping position (CP) and being in the clamping position (CP) is set up to apply a clamping force (FS) acting in the axial direction (A) parallel to the central axis (M) to a workpiece holding unit (17), - a plurality of slides (40) mounted on the base unit (21) so as to be movable at right angles to the central axis (M), each slide (40) being coupled to one of the clamping elements (32), - a rotary ring (46) which is arranged to be rotatable about the central axis (M) relative to the base unit (21) and which can be rotated between an initial rotary position (IP) assigned to the release position (RP) and a working rotary position (WP) assigned to the clamping position (SP), - a plurality of guide links (48) arranged on the rotary ring (46), each of the guide links (48) being coupled to one of the slides (40), and each of the guide links (48) having a first link section (49) and a second link section (50 ), and wherein at least the first link section (49) extends obliquely to the circumferential direction (U) about the central axis (M) and each slide (40) in the initial rotational position (IP) with the first link section (49) and in the working rotational position ( WP) is coupled to the second link section (50) of the associated guide link (48), - a force-generating device (55) which generates the clamping force (FS), the force-generating device (55) being coupled to the clamping elements (32) via the rotary ring (46) and the slide (40) in such a way that a torque is generated in the circumferential direction (U ) is generated on the rotary ring (46), which, due to the coupled movement, causes a thrust force on the slide (40) and thereby in turn causes the clamping force (FS) exerted by the clamping elements (32). quick release device claim 1 , wherein the second link section (50) runs at least partially obliquely to the circumferential direction (U). quick release device claim 1 or 2 , wherein the first link section (49) has a linear course. Quick-release device according to one of the preceding claims, wherein the second link section (50) has a non-linear and in particular arcuate course. Quick-release device according to one of the preceding claims, wherein a slope angle of a center line (L) of the guide link (48) relative to the circumferential direction (U) in the first link section (49) is greater at every point than in the second link section (50). Quick-action clamping device according to one of the preceding claims, wherein the force-generating device (55) has at least one force-generating element (57) which forces the rotary ring (46) into its initial rotary position (IP) in a first rotary position range of the rotary ring (46) and/or the rotary ring (46 ) in a second rotary position range of the rotary ring (46) in its working rotary position (WP) urges. quick release device claim 6 , The slides (40) being coupled to the first link section (49) of the respectively associated guide link (48) when the rotary ring (46) is in the first rotary position range. quick release device claim 6 or 7 , wherein the rotating ring (46) is in the second rotational position range when the slides (40) are coupled to the second link section (50) of the respectively assigned guide link (48). Quick release device according to one of Claims 6 until 8th , wherein the force-generating device (55) has at least one pivoting lever (59) which is pivotably mounted about a lever bearing axis (H) and is coupled to the force-generating element (57) or at least one of the force-generating elements (57) at a distance from the lever bearing axis (H). is. quick release device claim 9 , each force-generating element (57) generating an initial force (FI), and the initial force (FI) acts on the pivoted lever (59) with a torque when the direction of the initial force (FI) does not pass through the lever bearing axis (H). Quick-release device according to one of the preceding claims, wherein each clamping element (32) in the clamping position (CP) is supported inelastic in an axial direction (A) parallel to the central axis (M) and/or in a radial direction (R) radial to the central axis (M). Quick-action clamping device according to one of the preceding claims, in which the clamping elements (32) can be pivoted about a pivot axis (S) running at right angles to the central axis (M). Clamping system (15) having: - a quick-action clamping device (16) according to one of the preceding claims and - at least one workpiece holding unit (17) which is designed to hold a workpiece and which has a foot part (18) which can be positioned and clamped in the quick-action clamping device (16). which has a plurality of positioning bodies (19) on an underside which are set up to work together with a positioning recess (20) of the quick-action clamping device (16) for positioning and aligning the workpiece holding unit (17) in the quick-action clamping device (16), the foot part (18 ) has a clamping surface (36) on an upper side opposite the underside for each clamping element (32).

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