EP3061568B1 - Clamping device for clamping workpieces of variable thickness - Google Patents

Description

The invention relates to a clamping device for clamping workpieces at different clamping force of the clamping device, comprising a housing, a pivotable about a housing-fixed axis two-armed lever, wherein the lever arm of the lever is pivotally connected to a displaceably mounted in the housing clamping element and the other lever arm of the lever is pivotally connected to a rod in the region of one end of the rod and the rod is pivotally connected in the region of the other end with an actuating part, wherein the actuating part by means of an actuator of the clamping device is movable, wherein the rod and the associated lever arm form a toggle mechanism, which is located in a cocked workpiece in a position in which, without the action of the actuator, an opening of the clamping device is prevented, wherein a spring device is mounted in the housing forms a resilient stop for the actuator during clamping of the workpiece according to its strength.

Such a tensioning device is, for example, a substructure tensioner. In this case, the clamping element protrudes through an opening of a wall of the housing to tension sheets. The clamping serving end of the clamping element is in particular hook-shaped. When the sub-base tensioner is open, the hook-shaped end of the tensioning element is further extended out of the housing, while the tensioning element, for clamping the workpiece, is retracted more strongly into the housing, whereby the hook-shaped area of the tensioning element clamps the workpiece between itself and the housing.

In practice, applications are recorded in which by means of the clamping device different thickness workpieces are to be clamped, which are in particular sheets of different thickness. For example, the clamping device must be able to clamp both a sheet with a thickness of 1 mm, as well as sheets with a thickness of 2 mm, 3 mm or larger sheet thicknesses. It is particularly advantageous if the clamping of workpieces of different thickness can be done without external intervention in the clamping device, thus adjusting the clamping device by an operator.

A tensioning device that meets these requirements and that has the features of the type mentioned, is from the EP 2 626 174 A1 known. In this clamping device, the spring device which forms the resilient stop for the adjusting part during clamping of the workpiece according to its strength, designed as a gas spring. A piston of the gas spring is displaceable stored in a stationary gas spring housing. Here, the piston contacts the end face of a roller which is rotatably mounted in an axis, said axis being mounted in a slot of the adjusting part. Thus, during clamping of the workpiece, according to the thickness of the workpiece, the roller assume a variable position, and also the piston against which the roller, so in this manner according to the respective strength of the workpiece to be clamped a displacement of the stop for the Control can be accomplished.

From the DE 10 2013 009 925 A1 is another clamping device for clamping workpieces at different clamping force of the clamping device, thus known for clamping workpieces of different clamping force. Here, a spring element is arranged directly in the power flow of an actuator to a two-armed lever which receives a clamping element, which is pivotally mounted in the region of both ends. This spring element can expand differently depending on the strength of the workpiece to be clamped and thus introduced into the spring element.

Other clamping devices for clamping workpieces are in the DE 2003 13 040 U1 and EP 1 702 719 A1 described. However, these are not provided for clamping workpieces at different clamping force of the clamping device. It can be clamped with these fixtures at least no workpieces whose thickness is a multiple of an initial strength.

Further, the EP 2 177 320 A1 a tensioning device in which for the purpose of exerting a constant clamping force of a clamping arm on a workpiece to be clamped at different angular positions of a connecting rod of a toggle clamping device, the connecting rod is supported on a curved surface of a guide disc. Preferably, in this clamping device, a spring having an internal stop means is provided, wherein the connecting rod against the spring force
the stop means is movable until it rests against a stop surface, whereby the movement of the connecting rod and thus the movement of the clamping arm is limited.

Object of the present invention is to provide a comparison with the clamping device of the type mentioned modified clamping device, which is structurally particularly simple, but still allows the clamping of workpieces of different thickness.

The problem is solved by a clamping device which is designed according to the features of claim 1.

In the tensioning device according to the invention, it is provided that the spring device has a split spring receptacle with mechanical springs acting on relatively movable receiving parts of the spring receptacle. Here, means for connecting the two receiving parts are provided under the action of the springs. When clamping the workpiece, a receiving part is supported on the housing and it acts on the other receiving part on the control part.

In the tensioning device according to the invention, the spring device is constructed very compact and provided with a small number of exclusively mechanically acting components. The spring device is essentially formed by the two receiving parts and the springs, wherein the means for connecting the two receiving parts ensure that they can be forced apart under the action of mechanical springs to a certain extent. If the tool is not tensioned and the actuator is in a position corresponding to this position of the clamping element, the actuating part is moved out of the effective range of the spring device. In this case, the means for connecting the two receiving parts hold back the other receiving part. When clamping the workpiece, thus when the actuator moves the actuator again, the control part is moved back into the region of the spring means and it is based on the control part on reaching and exceeding the toggle position on the resilient stop, thus on the resilient spring means. The spring device is compressed to different degrees, depending on the strength of the workpiece to be clamped. With a relatively thin workpiece, the mechanical springs are only slightly compressed, while with a workpiece of greater strength, the mechanical springs are compressed more strongly.

The deformation of the mechanical springs is limited or controlled by the dimensions of the respective spring element to ensure irreversibility of the movement, as well as the clamping force of the clamping element, in particular of the hook. The stiffer the mechanical springs, the greater the clamping force of the clamping element or the hook.

In particular, the spring device is arranged within the housing of the tensioning device. The arrangement within the housing can be realized in a particularly simple manner, in particular when relatively small clamping forces are to be controlled by means of the clamping device, for example clamping forces of workpieces which lie in the range from 1 mm to 3 mm. For larger clamping forces of the workpieces, for example, at clamping thicknesses ranging from 1 mm to 7 mm, the spring device will usually have larger dimensions, so that in this case it is considered advantageous if the spring means is arranged outside the housing of the clamping device.

According to a preferred embodiment of the invention it is provided that the mechanical springs are designed as disc springs, in particular form a plate spring package. In this embodiment, the mechanical springs are arranged compact, thus need only a small space when transmitting quite large spring forces. In addition, these springs can be placed particularly favorable within the receiving parts of the spring receiver.

It when the means for connecting the two receiving parts have a screw, wherein the screw passes through a passage in one of the receiving parts and is screwed into a threaded bore of the other receiving part is particularly advantageous. Consequently, the two receiving parts are held by a simple screw connection, which ensures that the two receiving parts can move away from each other by the action of mechanical springs only by a defined amount, on the other hand, the receiving parts can be moved towards each other, when compressing the mechanical springs and relative movement the screw to the receiving part, which has the passage. In this way, the spring device be handled as a unit, thus pre-assembled as a unit and positioned in the housing.

It is provided in particular that the spring device is held in the housing. This can be done by a simple press connection, to the effect that the stationary receiving part of the spring receptacle is pressed into the housing, or by attaching the spring means in the housing by means of fastening means provided for this purpose.

Preferably, in the open position of the tensioning device, the adjusting member is out of action by the springs, wherein the receiving parts of the spring receiving means are held at a distance from each other by means for connecting the two receiving parts, based on the delivery of the two receiving parts to each other. If the tensioning device is in its non-tensioning position, the actuator has moved the actuating part out of the way of the spring device, wherein the means for connecting the two receiving parts ensure that the movable receiving part only moves away from the stationary receiving part by a defined amount can move. If the actuator is actuated again to clamp the workpiece, the actuating part moves into the region of the spring device and interacts with the movable receiving part of the spring device during clamping of the workpiece.

In this aspect, it is particularly provided that in the clamping position of the clamping device, with a tensioned workpiece relatively low thickness, the two receiving parts of the spring means are arranged at a relatively large distance from each other, based on the feed direction. Furthermore, it is provided that in the clamping position of the clamping device, with a tensioned workpiece of relatively large thickness, the two receiving parts of the spring device are delivered to each other maximum. This maximum delivery of the two receiving parts may well lead to contact the two receiving parts.

Structurally particularly simple, the spring device is designed and also very easy to assemble when the screw passes through a passage in the plate spring package. As a result, the individual disc springs are positioned and, moreover, essentially symmetrical forces are introduced into the two receiving parts of the spring device via the screw in cooperation with the disc spring package if the movable receiving part is not acted upon by the setting part.

It is advantageous if the disc spring assembly is guided axially outside by one of the receiving parts of the spring receiving and inside by the other receiving part of the spring receiving.

According to a particular embodiment of the invention it is provided that the actuating part is provided with a rotatable about an axis roller. The axis of this role is arranged parallel to the axis of the joint of the control part and rod. The role contacted during tensioning the spring device. This contacting is preferably recorded already in bringing about the final clamping position and, of course, when the workpiece is stretched.

The rotatable roller is in particular defined in the control part mounted, thus the axis is not displaced relative to a slot in the control part.

The roller preferably contacts a rolling surface of the associated receiving part of the spring receiver. At constant bearing axis of the roller in the control part is thus ensured that the role can roll due to the curved roller surface optimally on the rolling surface of the receiving part in the process of the actuating part by means of the actuator and then acts with increasing process more on the role of the associated receiving part and thus the spring means ,

It is considered to be particularly advantageous if the rolling surface is arranged parallel to the axis of the roller and substantially parallel to the direction of travel of the actuator.

Further features of the invention are set forth in the subclaims, the description of the figures and in the figures themselves, wherein it is noted that all individual features and all combinations of individual features are essential to the invention.

In the figures, the invention is illustrated with reference to an embodiment of a clamping device, without being limited to the described embodiment.

Fig. 1

eine Seitenansicht der erfindungsgemäßen Spannvorrichtung, die als Unterbauspanner ausgebildet ist, veranschaulicht für den Zustand des Spannens eines Bleches mit einer Stärke von 1 mm,

Fig. 2

einen Schnitt durch die Anordnung gemäß Fig. 1 gemäß der Linie II-II,

Fig. 3

eine Ansicht der Anordnung gemäß Fig. 1, allerdings bei demontiertem Gehäuseteil im Bereich der Spannkinematik, zur Verdeutlichung deren Aufbau,

Fig. 4

den in Fig. 3 umrandete Bereich A, betreffend die Kinematik der Spannvorrichtung in vergrößerter Darstellung,

Fig. 5 und 6

den Darstellungen der Fig. 3 und 4 entsprechende Darstellungen, allerdings für den Zustand des Spannens zweier Bleche mit jeweils einer Blechstärke von 1 mm, somit einer Spannstärke von 2 mm,

Fig. 7 und 8

den Darstellungen der Fig. 3 und 4 entsprechende Darstellungen, allerdings für den Zustand des Spannens dreier Bleche mit jeweils einer Blechstärke von 1 mm, somit einer Spannstärke von 3 mm,

Fig. 9

eine Ansicht der Spannvorrichtung gemäß Fig. 5, allerdings bei geöffneter Spannvorrichtung, somit auch ohne Blech.

It shows:

Fig. 1

a side view of the clamping device according to the invention, which is designed as a sub-base tensioner, illustrates for the state of tensioning a sheet with a thickness of 1 mm,

Fig. 2

a section through the arrangement according to Fig. 1 according to the line II-II,

Fig. 3

a view of the arrangement according to Fig. 1 , but with dismounted housing part in the area of the clamping kinematics, to clarify their structure,

Fig. 4

the in Fig. 3 bordered area A, concerning the kinematics of the clamping device in an enlarged view,

FIGS. 5 and 6

the representations of the 3 and 4 corresponding illustrations, however, for the state of tensioning two sheets, each with a sheet thickness of 1 mm, thus a clamping force of 2 mm,

FIGS. 7 and 8

the representations of the 3 and 4 corresponding illustrations, however, for the state of tensioning three sheets, each with a sheet thickness of 1 mm, thus a clamping force of 3 mm,

Fig. 9

a view of the clamping device according to Fig. 5 , but with open clamping device, thus also without sheet metal.

• Veranschaulicht ist eine Spannvorrichtung 1 zum Spannen von Werkstücken, insbesondere zum Spannen von Blechen. Die Spannvorrichtung 1 ist als Unterbauspanner ausgebildet.

In the following description, the presentation of the Fig. 1 to 3 Referenced:

• Illustrated is a clamping device 1 for clamping workpieces, in particular for clamping metal sheets. The tensioning device 1 is designed as a substructure tensioner.

The tensioning device has a housing 2 and a two-arm lever 4, which is pivotable about a housing-fixed axle 3. The one lever arm 5 of the lever 4 is pivotally connected to a displaceably mounted in the housing 2 clamping element 6. The pivoting takes place about the axis 7, in the region of the lever arm 5 and the clamping element 6 are interconnected. The tensioning element 6 has a guide section 8 arranged within the housing 2 with guide grooves 9, which pass through the bearing bolts 10. Adjacent to the guide section 8 is a clamping hook 11 of the clamping element 6, which is led out through an end opening in the housing 2 and clamping a workpiece 12, which is a sheet, between the clamping hook 11 and the housing 2, specifically one with the housing 2 connected support 13 is used.

The other lever arm 14 of the lever 4 is pivotally connected to a rod 15 in the region of one end of the rod 15. In this case, an axis 16 passes through the lever arm 14 and the rod 15. In the region of the other end, the rod 15 is pivotally connected to an actuating part 17. An axis 18 connects the rod 15 pivotally connected to the actuating member 17. The actuator 17 is designed as an angled component, wherein a substantially horizontally disposed legs of the actuator 17 end receives the axis 18 and a substantially vertically disposed, downwardly directed portion of the actuator 17 in the region of its lower end an axis 19 receives, in which a in Essentially vertically reciprocable piston rod 20 of an actuator 21 is pivotally mounted. The actuator 21 is in particular an electrically or pneumatically operated actuator, which is housed in a housing 22 which is connected to the housing 2.

The axes 16 and 19 are arranged parallel to each other. Parallel to these, a roller 23 is mounted in the corner region of the actuating part 17. The axis of the roller 23 is designated by the reference numeral 24. The adjusting member 17 is therefore movable by means of the piston rod 20 of the actuator 21.

The rod 15 and associated with this lever arm 14 form a toggle mechanism 25, which is located in a cocked workpiece 12 in a position in which, without the action of the actuator 21, an opening of the clamping device 1 is prevented.

The housing 2 has two housing parts 26, 27. In this, on the side facing away from the rod 15 of the adjusting member 17, a spring device 28 is mounted, which forms a resilient stop for the adjusting member 17 and thus for the roller 23 during clamping of the workpiece 12 according to its strength.

This spring device 28 has a split spring receptacle 29 with on relatively movable receiving parts 30, 31 of the spring retainer 29 acting mechanical springs 32. These mechanical springs 32 are formed as disc springs, which form a plate spring packet 33. There are formed as a screw means 34 for connecting the two receiving parts 30, 31 under the action of the springs 32 are provided. When clamping the workpiece 12, one receiving part 31 is supported on the housing 2 and the other receiving part 30 acts on the roller 23. Specifically, the roller 23 during clamping contacts a rolling surface 35 of the receiving part 30. This rolling surface 35 is arranged parallel to the axis 24 of the roller 23 and substantially parallel to the direction of movement 36 of the piston rod 20 of the actuator 21. Held is that Spring device 28 by the receiving part 31 is pressed into a receptacle 37 of the housing 2.

In detail, the spring device 28 is designed such that the screw 34 passes through a passage 38 in the receiving part 31 and the screw 34 is screwed into a threaded bore 39 of the receiving part 30. The screw 34 passes through the ring-shaped, in each case identical inner and outer diameter having springs 32 of the plate spring package 33. The plate spring packet 33 is guided externally through the receiving part 31, possibly also through the receiving part 30, furthermore, the plate spring packet inside by the receiving part 30, there the approach of the threaded hole 39 has, led. With a relatively relaxed plate spring packet 33, a relatively wide annular gap 40 is formed between the two receiving parts 30 and 31 in the area of their end faces, whereby the thickness of the annular gap 40 reduces with increasing compression of the plate spring packet 33 until the annular gap 40 is closed and thus the receiving part 30 the receiving part 31 contacted the front side.

• Die Fig. 9 zeigt die Spannvorrichtung in deren Nicht-Spannstellung, somit bei maximal ausgefahrenem Spannelement 6, damit maximal vom Gehäuse 2 beabstandet angeordnetem Spannhaken 11. Hierbei ist das Spannelement 6 derart positioniert, dass die gehäusefesten Lagerbolzen 10 die Führungsnuten 9 des Spannelements 6 im Bereich deren unteren Enden kontaktieren. Der Hebel 4 nimmt hierbei eine Schwenkstellung ein, die dazu führt, dass die mit diesem verbundene Stange 15 nahezu gestreckt bezüglich des Hebelarms 14 des Hebels 4 angeordnet ist. Aufgrund dieser kinematischen Beziehung befindet sich das Stellteil 17 in einer maximal entfernten Stellung vom Spannelement 6, die der eingefahrenen Stellung der Kolbenstange 20 des Aktuators 21 entspricht. Durch Einfahren der Kolbenstange 20 des Aktuators 21 wird somit diese Funktionsstellung gemäß Fig. 9 erreicht. In dieser Stellung liegt die Rolle 23 gerade noch im Bereich deren Scheitel an der Abrollfläche 35 des Aufnahmeteils 30 im Bereich dessen unteren Endes an.

The operation of the tensioner will be described below.

• The Fig. 9 shows the clamping device in its non-clamping position, thus at maximum extended clamping element 6, thus maximally spaced from the housing 2 arranged clamping hook 11. Here, the clamping element 6 is positioned such that the housing-fixed bearing pin 10, the guide grooves 9 of the clamping element 6 in the region of the lower ends to contact. The lever 4 in this case assumes a pivoting position, which results in that the rod 15 connected thereto is arranged almost stretched with respect to the lever arm 14 of the lever 4. Due to this kinematic relationship, the adjusting member 17 is in a maximum remote position of the clamping element 6, which corresponds to the retracted position of the piston rod 20 of the actuator 21. By retracting the piston rod 20 of the actuator 21 is thus this functional position according to Fig. 9 reached. In this position, the roller 23 is straight still in the region of the vertex of the rolling surface 35 of the receiving part 30 in the region of the lower end.

Starting from this position, for the clamping of the workpiece or sheet 12, the actuator 21 is actuated and the piston rod 20 is extended. Accordingly, the roller 23 rolls on the rolling surface 35, until in the in the 3 and 4 illustrated end position. In this case, thus during the clamping of the workpiece 12, the lever 4 is pivoted due to its connection via the rod 15 with the adjusting member 17 in the clockwise direction, in the over-center position. In this position, the toggle mechanism 25 remains even when no force is actively exerted on the actuator 17 via the actuator 21. This Übertotpunktstellung is thus canceled only when the piston rod 20 is retracted by the activation of the actuator 21.

The 3 and 4 illustrate that in the clamping of a workpiece or sheet 12, for example, has a thickness of 1 mm, the clamping element 6 assumes such a position that their guide grooves 9 contact the housing-fixed bearing pin 10 in its upper end. When clamping this thin workpiece takes place little or no compression of the plate spring package 33 due to the action of the roller 23 on the receiving part 30th

If, on the other hand, a workpiece of greater thickness is to be clamped, illustrated in FIG FIGS. 5 and 6 by clamping two sheets of 1 mm thickness, this leads to the over-center position of the toggle mechanism 25 is already reached before the upper ends of the guide grooves 9 of the clamping element 6 contact the housing-fixed bearing pin 10. This deviating position causes the setting member 17, based on the arrangement according to the FIGS. 5 and 6 is shifted slightly horizontally in the direction of the spring means 28, and consequently the roller 23 via the receiving part 30, the plate spring packet 33 compresses slightly more. There is thus a bearing displacement This state when clamping a total workpiece thickness of 2 mm is clearly the Fig. 6 refer to. There it is shown that the annular gap 40 has a correspondingly lower thickness and the screw 34 no longer bears axially on the receiving part 31 in the region of its head.

Is how the representation of FIGS. 7 and 8 it can be seen to stretch an even stronger workpiece, in this case three sheets 12 with a thickness of 1 mm, therefore to stretch a total thickness of 3 mm, this will cause the toggle mechanism 25 is still in its over-center position, however the adjusting member 17 is further displaced against the resilient stop, with the consequence that the cup spring package 33 is further compressed. In particular, the representation of Fig. 8 It can be seen that the annular gap 40 between the two receiving parts 30, 31 is closed and the screw 34 is further displaced axially with respect to the receiving part 31.

To release the clamping hook 11, the clamping device, starting from the respective clamping position according to Fig. 4 . Fig. 6 or Fig. 8 , in the non-tension position according to Fig. 9 transferred. Thus, the piston rod 20 is retracted by actuation of the actuator 21 and it rolls off the roller 23 on the rolling surface 35, wherein, due to the transfer of the toggle mechanism 25 from the over-center position, now the spring means 28 can relax.

LIST OF REFERENCE NUMBERS

1

jig

2

casing

3

axis

4

lever

5

lever arm

6

clamping element

7

axis

8th

guide section

9

guide

10

bearing bolt

11

tenterhook

12

Workpiece / plate

13

edition

14

lever arm

15

pole

16

axis

17

adjusting part

18

axis

19

axis

20

piston rod

21

actuator

22

casing

23

role

24

axis

25

Toggle mechanism

26

housing part

27

housing part

28

spring means

29

spring mount

30

receiving part

31

receiving part

32

feather

33

Belleville spring assembly

34

Medium / screw

35

rolling surface

36

traversing

37

admission

38

passage

39

threaded hole

40

annular gap

Claims (14)

1. Clamping apparatus (1) for clamping workpieces (12) with different clamping strength of the clamping apparatus (1), having a housing (2), a two-arm lever (4) that is pivotable about a pin (3) secured to the housing, wherein one lever arm (5) of the lever (4) is connected in a pivotable manner to a clamping element (6) mounted in a displaceable manner in the housing (2) and the other lever arm (14) of the lever (4) is connected in a pivotable manner to a rod (15) in the region of one end of the rod (15) and the rod (15) is connected in a pivotable manner to an actuating part (17) in the region of the other end, wherein the actuating part (17) is movable by means of an actuator (21) of the clamping apparatus (1), wherein the rod (15) and the lever arm (14) connected thereto form a toggle-lever mechanism (25) which, with a workpiece (12) clamped in place, is in a position in which the clamping apparatus (1) is prevented from opening without any action by the actuator (21), wherein a spring device (28) is mounted in the housing (2), said spring device (28) forming a resilient stop for the actuating part (17) when the workpiece (12) is clamped, depending on the thickness thereof, characterized in that the spring device (28) has a divided spring receptacle (29) with mechanical springs (32) that act on receptacle parts (30, 31), movable relative to one another, of the spring receptacle (29), wherein means (34) for connecting the two receptacle parts (30, 31) are provided, wherein, when the workpiece (12) is clamped, one receptacle part (31) is supported on the housing (2) and the other receptacle part (30) acts on the actuating part (17).
2. Clamping apparatus according to Claim 1, characterized in that the mechanical springs (32) are in the form of disc springs, and in particular form a disc spring assembly (33).
3. Clamping apparatus according to Claim 1 or 2, characterized in that the means (34) for connecting the two receptacle parts (30, 31) have a screw (34), wherein the screw (34) passes through a passage (38) in one receptacle part (31) of the receptacle parts (30, 31) and is screwed into a threaded bore (39) in the other receptacle part (30).
4. Clamping apparatus according to one of Claims 1 to 3, characterized in that, in the open position of the clamping apparatus (1), the actuating part (17) is not acted upon by the springs (32), wherein the receptacle parts (30, 31) of the spring receptacle (29) are kept spaced apart from one another by means of the means (34) for connecting the two receptacle parts (30, 31), with respect to the advancing direction of the two receptacle parts (30, 31) with respect to one another.
5. Clamping apparatus according to Claim 4, characterized in that, in the clamping position of the clamping apparatus (1), with a workpiece (12) with a relatively small thickness clamped in place, the two receptacle parts (30, 31) of the spring device (28) are arranged at a relatively large spacing apart from one another, with respect to the advancing direction thereof.
6. Clamping apparatus according to Claim 5, characterized in that, in the clamping position of the clamping apparatus (1), with a workpiece (12) with a relatively large thickness clamped in place, the two receptacle parts (30, 31) of the spring device (28) are in a state advanced towards one another to the maximum and are in contact with one another.
7. Clamping apparatus according to one of Claims 3 to 6, characterized in that the screw (34) passes through a passage in the disc spring assembly (33).
8. Clamping apparatus according to one of Claims 3 to 7, characterized in that the disc spring assembly (33) is axially guided on the outside by at least one of the receptacle parts (30, 31), in particular by the stationary receptacle part (31), and on the inside by the movable receptacle part (30).
9. Clamping apparatus according to one of Claims 1 to 8, characterized in that the receptacle part (31) supported on the housing (2) is held in the housing (2).
10. Clamping apparatus according to one of Claims 1 to 9, characterized in that the actuating part (17) is provided a roller (23) that is rotatable about a pin (24), wherein the pin (24) of said roller (23) is arranged parallel to the pin (18) of the articulated joint of the actuating part (17) and rod (15), and the roller (23) comes into contact with the spring device (28) during clamping.
11. Clamping apparatus according to Claim 10, characterized in that the roller (23) comes into contact with a rolling surface (35) of the receptacle part (30), assigned thereto, of the spring device (28).
12. Clamping apparatus according to Claim 11, characterized in that the rolling surface (35) is arranged parallel to the pin (24) of the roller (23) and substantially parallel to the direction of movement of an actuating means (20) of the actuator (21).
13. Clamping apparatus according to one of Claims 1 to 12, characterized in that the spring device (28) is arranged inside the housing (2) of the clamping apparatus (1).
14. Clamping apparatus according to one of Claims 1 to 12, characterized in that the spring device is arranged outside the housing (2) of the clamping apparatus (1).

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