EP3169484A1

EP3169484A1 - Clamping device

Info

Publication number: EP3169484A1
Application number: EP15759363.3A
Authority: EP
Inventors: Andreas NEBEL
Original assignee: DE STA CO Europe GmbH
Current assignee: DESTACO Europe GmbH
Priority date: 2014-07-15
Filing date: 2015-07-08
Publication date: 2017-05-24
Also published as: DE102014109897A1; CN106794571A; US20170259406A1; WO2016008474A1

Abstract

The invention relates to a clamping device, comprising a drive (1) having a linearly movable actuator (2) and a position monitoring device (3) for detecting the position of the actuator (2), a pivot member (4) which is operatively connected to the actuator (2) being rotatably mounted about an axis of rotation (8) which is stationary with respect to the drive (1). According to the invention, the position monitoring device (3) for detecting the position of the actuator (2) is designed to cooperate with the pivot member (4).

Description

jig

The invention relates to a clamping device according to the upper 5 handle of claim 1.

A clamping device of the type mentioned is known from the patent document DE 102 38 815 B3. This Zentrierspannvorrichtung consists of a drive, in particular piston drive 10, with a linearly movable actuator (piston rod) and a position sensing device for detecting the position of the piston rod (shown left in Figure 4 of this document indicated), wherein an operatively connected to the piston rod pivot member is provided is rotatably mounted about a fixed to the drive 15 axis of rotation.

From the patent document EP 2 433 751 A2 a similar tensioning device is also known, in which, however, the said axis of rotation is mounted within narrow limits displaceable to the drive. 20

Another clamping device of the type mentioned above is also known from the patent document EP 1 258 313 A2.

In the two latter solutions according to EP 2 433 751 25 A2 and EP 1 258 313 A2, the pivot member is optionally referred to as a lever element (see reference numeral 3) or as an actuator (see reference numeral 5). Furthermore, in these two solutions, as in the case of the aforementioned DE 102 38 815 B3, the position sensing device, as can be seen from FIG. 4 of EP 0 433 751 A2 or from FIG. 5 of EP 1 258 313 A2, laterally on the housing Clamping arranged and operates directly with a position transmitter arranged at the free, piston-driven end of the piston rod.

The invention has for its object to improve a clamping device 5 tion of the type mentioned. In particular, a clamping device with an improved position detection is to be created.

This object is achieved with a clamping device of the type mentioned at the outset by the features listed in the characterizing part of patent claim 1.

According to the invention, it is thus provided that the position sensing device is designed to cooperate with the pivot member for position detection of the actuator.

In other words, the solution according to the invention is characterized in particular by the fact that the linear movement of the actuator or, in particular, of the piston rod is first transformed or translated into a rotational movement of the pivot member and only then the rotational movement of the pivot member is detected with the position sensing device , This proviso has the advantage that from a relatively small movement of the actuator or in particular the piston rod 25 a relatively large movement of the pivot member can be generated, which in turn leads to an improved position detection at constant measurement accuracy of the position sensing device. Other advantageous developments of the clamping device of the invention will become apparent from the dependent claims.

For the sake of completeness, the patent documents DE 88 11 579 Ul, DE 90 16 781 Ul, DE 198 24 579 C1, DE 199 06 641 A1, US 2004/0061268 A1, DE 10 2006 049 447 A1 and US Pat DE 20 2011 002 820 Ul.

The clamping device according to the invention including its 10 advantageous developments according to the dependent claims will be explained in more detail with reference to the drawing representation of two embodiments.

It shows 15

Figure 1 in side view a first embodiment of the clamping device according to the invention in the fully open position (opening angle 72 °);

FIG. 2 shows a plan view (with the position scanning device 20 open) of the clamping device according to FIG. 1 in the fully opened position (opening angle 72 °);

FIG. 3 shows a plan view of the clamping device according to FIG. 1 in FIG

partly open position (opening angle 30 °); 25

Figure 4 in side view of the clamping device of Figure 1 in the closed position with a clamped double plate;

FIG. 5 shows a plan view (with the position sensing device open) of the tensioning device according to FIG. 4; 30 Figure 6 in side view of the clamping device of Figure 1 in the closed position with a clamped single sheet;

FIG. 7 shows a plan view (with the position sensing device open) of the tensioning device according to FIG. 6; 5

FIG. 8 shows a side view of the clamping device according to FIG. 1 in the closed position without a workpiece;

FIG. 9 shows a top view (with the position sensing device open) of the tensioning device according to FIG. 8;

FIG. 10 shows in perspective the tensioning device according to FIG. 5; 10

FIG. 11 is a bottom view (when the position sensing device is open) of the tensioning device according to FIG. 5;

12 is a perspective view of a second embodiment of the tensioning device according to the invention (the piston drive provided is not shown separately, again with the position sensing device open) in the fully opened position;

FIG. 13 shows in perspective the tensioning device according to FIG. 12

in partially open or partially closed position; and 20

Figure 14 in side view of the clamping device according to FIG

12 in the closed position.

The tensioning device shown in the figures consists in a known manner initially of a drive 1 with a linear actuator 2 movable and from a preferably electrically (in particular inductively, but also pneumatically or electromechanically) operating position sensing device 3 for detecting the position of the actuator 2, wherein a rotatably mounted to the drive 1 and operatively connected to the actuator 2 30 pivot member 4 is provided. As already mentioned, it is particularly preferred that the drive 1 from a in a cylinder movably mounted piston and attached thereto, designed as a piston rod actuator 2 consists. In addition, it is provided that the pivot member 4 is rotatably mounted about a fixed to the drive 1 axis of rotation 8, that is, the position of the axis of rotation 8 to the drive 1 is at 5 each time the same.

With regard to already known features of the mechanism of the embodiment according to FIGS. 1 to 11, reference is made to the aforementioned patent document DE 20 2011 002 820 U1 for the sake of simplicity, from which, however, a solution with a manual drive and not with a piston drive emerges. Moreover, the actuating mechanism is comparable, d. H. the actuator 2 is connected via a curve with a pivot member, which in turn has a clamping element 6, which is associated with a 15 abutment 10. A workpiece to be fixed is thus clamped in this embodiment (see also FIGS. 4, 5, 6, 7, 10 and 11) between the clamping element 6 and the abutment 10.

20

With regard to already known features of the mechanism of the embodiment according to FIGS. 12 to 14, in which the tensioning device is designed as a centering clamping device with a centering mandrel 9 and a tensioning element 6 designed as a tensioning hook, reference is further made to patent document EP 2 433 751 for the sake of simplicity A2, from which it can also be seen at which point the drive (in particular piston drive) not shown in FIGS. 12 to 14 is arranged, namely at the end of the housing receiving the pivot member. 30 Essential for all embodiments of the clamping device according to the invention is now that the position sensing device 3 is designed to cooperate with the pivot member 4 for detecting the position of the actuator 2.

5

It is particularly preferably provided that the actuator 2 and the pivot member 4 are operatively connected to each other via a cam guide 5. This cam guide 5 is formed from a guide track and a guide element 5.3 which engages in a form-fitting manner in the guide track, wherein the guide track on the swivel link 4 and the guide element 5.3 on the actuator 2 are preferably arranged. In addition, the cam guide 5 or its guide track, as can be seen from the figures, has at least two guide sections 5.1, 5.2 which are angled relative to one another, wherein these guide tracks are preferably continuous in one another.

These provisos serve to ensure that a specific adjustment of the actuator 2 in cooperation with the first guide section 5.1 is connected to a smaller and a comparable position of the actuator 2 in cooperation with the second guide section 5.2 with a greater rotational movement of the pivot member 4.

The term "comparable" expresses the fact that ultimately results in a different rotational movement with the same steep path length of the actuator 2, but at a different setting position.

Furthermore, the stated provisos lead to a cooperation of the actuator 2 with the first guide section 5.1 of the cam guide 5 a region of an opening position of or the clamping element 6 and an interaction of the actuator 2 with the second guide section 5.2 of the cam guide

5 is associated with a region of a closed position of a or the clamping element 6.

5

As can be seen, therefore, there is only an indirect connection between the pivot member 4 and the clamping element 6, d. H. the movement translation between pivot member 4 and clamping element

6 deliberately has no consistent proportionality. 10

Furthermore, it is preferably provided that the pivot member 4, which could also be referred to as a pointer or the like, having a cooperating with the position sensing device 3 position transmitter 7, which is optionally formed as a separate component 15 on the pivot member 4 or as an integral part of the pivot member 4. In addition, the position sensing device 3 has a detection range with two sensor elements 3.1, 3.2, which are preferably designed to be adjustable within the detection range, for detecting different positions of the position transmitter 7 (see also FIG. 11). Here, what is explained in more detail below, particularly preferably provided that the detection area has four subregions, wherein in two subregions in each case one sensor element 3.1, 3.2 and between two sensor elements 3.1, 25 3.2 another sub-area, also called intermediate sub-area, is arranged ,

Furthermore, it is particularly preferably provided in this context that the position sensing device 3 is connected to a transmitter which stores a temporal sequence of positions of the pivoting element 4. With the help of this it is what also explained in more detail, in a particularly advantageous manner possible to draw conclusions about the actual position of the actuator 2 and thus ultimately to the clamping position.

5

With regard to the embodiment according to Figures 1 to 11 is further particularly preferably provided that the pivot member 4 has a triangular basic shape, wherein at one corner the axis of rotation 8, at a second corner one or the cam guide 5 and at a third corner or the position transmitter 7 interacting with the position detection device 3 is arranged. In addition, the actuator 2 is formed on both sides protruding from the drive 1, in which case the actuator 2 is on the one hand with one or the clamping element 6 and on the other hand with the pivot member 4 operatively connected 15 forms.

With regard to the embodiment according to FIGS. 12 to 14, it is further particularly preferred for the pivoting member 4 to have an elongate basic shape, wherein the rotary axis 8 is provided at one end, and the position transmitter 7 interacting with the position sensing device 3 at one end and interposed therebetween one or the cam guide 5 is arranged.

The tensioning device according to the invention according to FIGS. 1 to 25 11 thus functions as follows:

Starting from the opening position in Figures 1 and 2, the actuator 2 is in its rightmost position, in which the arranged on the actuator 2 guide element 5.3 is positioned at a 30 outer end of the first guide section 5.1. Will now be used with the preferably pneumatically operated drove 1, the actuator 2 moves to the left, shifts the guide element 5.3 within the first guide section 5.1 to the left, so that the pivot member 4 is caused due to the selected geometry of the cam guide 5, to perform a rotary movement in a clockwise direction. As the comparison of FIGS. 2 and 3 shows, the position transmitter 7 moves out of the detection range of the one sensor element 3.1. In this case, in this section of the cam guide 5, a relatively large movement of the actuator 2 leads to a comparatively small rotational movement of the pivot member 4. 10

If the actuator 2 is moved further to the left by means of the drive 1, this leads (see FIG. 5) to the fact that the guide element 5.3 reaches the continuous transition region between the first and second guide sections 5.1 and 5.2. In addition, the position transmitter 7 arrives in the abovementioned partial area arranged between the two sensor elements 3.1 and 3.2.

FIG. 5 shows a clamping position in which a so-called double plate is positioned between the clamping element 6 and the abutment 10. A double sheet is to be understood as meaning a sheet that has twice the thickness of a so-called single sheet, as shown in FIGS. 6 and 7. 25

If FIGS. 5 and 7 are compared, it becomes clear that a further displacement of the actuator 2 to the left and thus a displacement of the guide element 5.3 into the second guide section 5.2 further, this time significantly greater rotational movement of the pivot member 4 and thus adjustment of the position transmitter 7 from the intermediate part area to the other, the sensor element 3.2 associated portion has the consequence.

Finally, in FIG. 9, the pivoting member 4 is pivoted into the remaining, fourth subarea, wherein the sensor element 3.2 is arranged between the aforementioned intermediate subarea and this fourth subarea.

From the above explanations it follows that it is possible with the aforementioned evaluation to determine the respective 10 position of the actuator 2 and the clamping element very accurately, even so accurate that the transmitter easily between a single sheet (see the position of Position transmitter 7 in Figure 7) and a double plate (see the position of the position sensor 7 in Figure 5) under 15 can divorce. The solution according to the invention thus ultimately leads to an improvement in the measuring accuracy in the opening angle range relevant to the clamping device.

The tensioning device according to the invention according to FIGS. 12 to 20 14 finally works as follows:

The clamping device according to this embodiment ultimately works in the same way, with the actuator (not shown separately) moving actuator 2 causes a pivoting 25 of the pivot member 4. Also in this case, the curve guide 5 provided with this solution also has a first and a second guide section 5.1 and 5.2 that the pivot member 4 rotates differently in different movement sections of the actuator 2, d. 30 h. even with this solution, a special sensitive detection tion of the position of the clamping element or clamping hook in the particularly relevant area shortly before the closed position possible.

LIST OF REFERENCE NUMBERS

1 drive

2 actuator

3 position sensing device

3. 1 sensor element

3. 2 sensor element

4 swivel link

5 curve guide

5. 1 guide section

5. 2 guide section

5. 3 guide element

6 clamping element

7 position transmitter

8 axis of rotation

9 centering pin

10 abutments

Claims

claims

A tensioner comprising a drive (1) having a linearly movable actuator (2) and a position sensing means (3) for detecting the position of the actuator (2), one pivoting member (4) operatively connected to the actuator (2) being rotatable is mounted about a rotational axis (8) fixed to the drive (1),

characterized,

in that the position sensing device (3) for position detection of the actuator (2) is designed to cooperate with the pivoting member (4).

2. Clamping device according to claim 1,

characterized,

that the actuator (2) and the pivot member (4) via a cam guide (5) are operatively connected to each other.

3. Clamping device according to claim 2,

characterized,

in that the cam guide (5) has at least two guide sections (5.1, 5.2) angled away from one another.

4. Clamping device according to claim 3,

characterized,

that the guide sections (5.1, 5.2) are formed continuously merging into one another.

Clamping device according to claim 3 or 4,

characterized,

a specific adjustment of the actuator (2) in cooperation with the first guide section (5.1) is associated with a smaller and a comparable adjustment of the actuator (2) in cooperation with the second guide section (5.2) with a greater rotational movement of the pivot member (4) ,

Tensioning device according to one of claims 3 to 5,

characterized,

that an interaction of the actuator (2) with the first guide portion (5.1) of the cam guide (5) a region of an opening position of a clamping element (6) and an interaction of the actuator (2) with the second guide portion (5.2) of the cam guide (5) Area is associated with a closed position of a clamping element (6).

Tensioning device according to one of claims 1 to 6,

characterized,

the pivoting member (4) has a position transmitter (7) which interacts with the position sensing device (3).

Clamping device according to claim 7,

characterized,

in that the position sensing device (3) has a detection area with two sensor elements (3.1, 3.2) for detecting different positions of the position transmitter (7).

9. Clamping device according to claim 8,

characterized,

the detection area has four partial areas, wherein in each case one sensor element (3.1, 3.2) is arranged in two partial areas and a further partial area is arranged between two sensor elements (3.1, 3.2).

10. Clamping device according to one of claims 1 to 9,

characterized,

in that the position sensing device (3) is connected to evaluation electronics which store a chronological sequence of positions of the pivoting element (4).