EP4088864B1 - Clamping device - Google Patents

Clamping device Download PDF

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Publication number
EP4088864B1
EP4088864B1 EP22171353.0A EP22171353A EP4088864B1 EP 4088864 B1 EP4088864 B1 EP 4088864B1 EP 22171353 A EP22171353 A EP 22171353A EP 4088864 B1 EP4088864 B1 EP 4088864B1
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EP
European Patent Office
Prior art keywords
lower jaw
segment
clamping device
clamp
front edge
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP22171353.0A
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German (de)
French (fr)
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EP4088864A1 (en
Inventor
Franz-Josef Pfeffer
Simon Pfeffer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
F J Pfeffer Formenbau GmbH
Original Assignee
F J Pfeffer Formenbau GmbH
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Publication of EP4088864A1 publication Critical patent/EP4088864A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B5/00—Clamps
    • B25B5/06—Arrangements for positively actuating jaws
    • B25B5/10—Arrangements for positively actuating jaws using screws
    • B25B5/104—Arrangements for positively actuating jaws using screws with one screw and one clamping lever and one fulcrum element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B5/00—Clamps
    • B25B5/04—Clamps with pivoted jaws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B5/00—Clamps
    • B25B5/16—Details, e.g. jaws, jaw attachments

Definitions

  • the invention relates to a clamping device.
  • the invention relates in particular to a clamping device for wire EDM machines.
  • Wire EDM machines of this type work on the principle of spark erosion, with a wire in a liquid dielectric being used to cut specific shapes, contours and the like into workpieces.
  • Clamping devices are used to hold the workpieces in a predetermined machining position during this machining.
  • Known clamping devices used for this purpose are each designed in the form of a vice, in which clamping jaws are fed to one another by means of spindles in order to clamp the workpieces.
  • a first disadvantage of this clamping device is that the spindles become dirty over time and therefore have to be cleaned and serviced at certain time intervals.
  • the spindles arranged inside the clamping device cannot be removed or can only be removed with great effort. The cleaning and maintenance of the spindles therefore involves a great deal of time and money.
  • a further disadvantage of the clamping devices designed as vices is that their designs cannot be easily adapted to the working processes of wire EDM machines.
  • Such vices typically consist of a cuboid base body which has recesses in which clamping jaws driven by spindles can be moved. In general, these recesses open out on a vertical side wall of the cuboid body of the vice. The respective workpieces must be inserted there in order to be able to clamp them. This causes considerable problems, especially in the case of small and flat workpieces, such as are typically machined with wire EDM machines.
  • a clamping device which has a lower jaw, on the front edge of which there is a support surface, which runs at least approximately in a horizontal plane, for a workpiece to be clamped. Furthermore, at least one clamp is arranged above the lower jaw, which is mounted pivotably on the upper side of the lower jaw in the region of its rear end. By actuating a clamping device, the clamp is guided against the upper side of the lower jaw, as a result of which the front edge of the clamp is pressed against the upper side of the workpiece lying on the support surface.
  • the invention is based on the object of providing a tensioning device which has further improved functionality.
  • the invention relates to a clamping device with a lower jaw, on the front edge of which there is a support surface running at least approximately in a horizontal plane for a workpiece to be clamped, and with at least one clamp arranged above the lower jaw, which in the Area of its rear end is pivotally mounted on the top of the lower jaw.
  • a clamping device By actuating a clamping device, the clamp is guided against the upper side of the lower jaw, as a result of which the front edge of the clamp is pressed against the upper side of the workpiece lying on the support surface.
  • a slot runs in the lower jaw, separating an upper segment from a lower segment.
  • the underside of the lower segment forms a contact surface for resting on a base.
  • the front edge with the bearing surface is provided on the upper segment.
  • adjustment means for adjusting the front edge are provided in the upper segment.
  • the clamping device With the clamping device according to the invention, high-precision clamping of workpieces is made possible, with the clamping device being particularly suitable for clamping small workpieces.
  • the lower jaw and the clamp as components of the clamping device for clamping a workpiece are modeled on the shape of two human fingers holding an object. This means that the lower jaws and the clamp run flat towards the workpiece to be clamped. This has the significant advantage that at the location where the workpiece is clamped, the area around the workpiece is not blocked or obstructed by the clamping device, so that means for processing the workpiece can be brought directly to it.
  • the clamping device according to the invention is therefore particularly advantageously suitable for use in wire EDM machines.
  • the wire of the wire EDM machine and the nozzles for the liquid dielectric as further components of the wire EDM machine can thus be brought very close to the clamping device, so that machining of very small workpieces is also easily possible.
  • Another important advantage of the clamping device according to the invention is that it enables workpieces to be clamped with high precision.
  • this is also achieved in that a slot runs in the lower jaw, through which a force-related decoupling between the upper segment and the lower segment of the lower jaw is obtained.
  • the lower segment is used to couple the lower jaw to a base, while the upper segment, with the front edge and its support surface, has the means for clamping the workpiece. Due to the fact that the lower segment and the upper segment are decoupled by the slot, the attachment of the lower jaw to a base does not impair the alignment of the means for clamping the workpiece, namely the front edge with the support surface, which increases the precision of the clamping device becomes.
  • the lower jaw has a slot-shaped receptacle for receiving a fastening screw, by means of which the lower jaw can be fixed to the base.
  • the slot-shaped receptacle has a slot segment in the upper segment, in which a fastening screw is guided with play, and a slot segment in the lower segment, the edges of the lower segment delimiting the slot segment forming screw surfaces for mounting the fastening screws.
  • the slot extends over the entire width of the lower jaw and opens out at the lateral edges thereof.
  • the slot runs essentially in a horizontal plane.
  • the slot has a spiral-shaped end segment in a rear area of the lower jaw that is averted from the front edge.
  • the slot advantageously has an end segment opening out at the front edge of the contact surface.
  • the lower segment is thus dimensioned in such a way that it completely encompasses the contact surface and is delimited with it from the upper segment by the slot.
  • the cross-section line of the end segment is particularly advantageously wavy.
  • the wavy shape of the slot limits movement of the upper segment relative to the lower segment, preventing damage to the lower jaw when forces are applied.
  • the front edge can be precisely aligned with the support surface that is used to clamp the workpiece, which ensures an extremely precise clamping process.
  • the adjustment means are provided in the upper segment of the lower jaw and are thus decoupled from the fastening means for fastening the lower jaw on the base, which are arranged in the lower segment, so that the adjustment with the adjustment means is unaffected by the fastening of the lower jaw on the base.
  • the adjusting means are particularly advantageously formed by adjusting screws, which are guided into the threaded bores forming the receptacles in the upper segment.
  • each adjusting screw has a peg-shaped end piece in its lower end.
  • the pin-shaped end piece protrudes beyond the lower open edge of the threaded hole and presses against the upper segment.
  • two adjustment means are provided.
  • the adjustment means and the associated receptacles are each configured identically.
  • the lower jaw has a slot-shaped receptacle for receiving a fastening screw, by means of which the lower jaw can be fixed to the base.
  • the front edge is aligned with the bearing surface in the direction of the longitudinal axes of the lower jaw by fastening the lower jaw.
  • the lower jaw can then be laterally adjusted in two spatial directions with the adjusting screw lying symmetrically to the longitudinal axis, so that it is exactly aligned in all spatial directions.
  • FIGs 1 to 3 show an exemplary embodiment of the clamping device 1 according to the invention.
  • the clamping device 1 is used for a wire EDM machine.
  • figure 3 shows the clamping device 1 with components of such a wire EDM machine.
  • the clamping device 1 shown comprises a lower jaw 2 and two clamps 3 which are arranged on the upper side of the lower jaw 2 and are pivotably mounted on it.
  • the clamps 3 are of identical design.
  • the clamping device 1 can also be a Have lower jaw 2, on which only one or more than two brackets 3 are arranged.
  • Lower jaw 2 is in Figure 4a shown in a single representation.
  • the lower jaw 2 and the brackets 3 are each made of stainless steel. As in particular from the Figures 3 and 4a As can be seen, the lower jaw 2 forms a flat, solid component whose cross section is constant in the y-direction.
  • the lower jaw 2 On the underside, the lower jaw 2 has a contact surface 4 running in a horizontal plane (that is, in an xy plane), with which the lower jaw 2 can be positioned and fixed on a base, in particular on a clamping table of the wire EDM machine.
  • Another surface 5 running in a horizontal plane is provided on the underside, set off downwards from the contact surface 4 by a step.
  • the lower jaw has a bevel 6 adjoining the surface 5 .
  • the lower jaw 2 has a boundary surface 7 in a horizontal plane on its upper side, which is adjoined by a sloping surface 8 towards the front.
  • a shoulder 9 At the front edge of the inclined surface 8 closes, separated by a shoulder 9, a running in a horizontal plane bearing surface 10 on which a workpiece 11 to be clamped can be placed, as shown in FIGS Figures 1 to 3 is evident.
  • the shoulder 9 does not merge directly into the inclined surface 8, but is separated from it by a narrow surface segment 9a, which runs parallel to the bearing surface 10 in a plane.
  • the bearing surface 10 extends over the entire width of the lower jaw 2, the shape of which is constant over the entire width of the lower jaw 2.
  • the contact surface 10 is hardened and ground and thus forms a reproducible, wear-free support for the workpiece 11.
  • the contact surface 10 lies in the same plane as the contact surface 4 Contact surface 4 defined machine zero point for the support surface 10 and thus receive the workpiece 11 lying there.
  • the clamps 3 form elongated components with longitudinal axes running parallel in the x-direction.
  • the clamps 3 are each mounted pivotably on the lower jaw 2 with a pivoting mount.
  • the lower jaw 2 has a cylindrical recess 12 as a receptacle for cylinder segments 13 provided on the undersides of the clamps 3 .
  • the cylindrical receptacle extends in the y-direction over the entire width of the lower jaw 2 and ends at its side walls.
  • the cylindrical receptacle has a cross section that is constant over its entire length, the cross section forming a segment of a circle that extends over an angular range that is slightly larger than 180°.
  • the contours of the cylinder segments 13 are precisely adapted to the contour of the cylindrical receptacle, ie the cylinder segments 13 also each have a cross section in the form of a circular segment that is constant over their length.
  • the cylinder segments 13 of the clamps 3 can be pushed laterally into the cylindrical receptacle for mounting the clamping device 1 . Since the circular cross section of the cylindrical receptacle extends over an angular range greater than 180°, the cylinder segments 13 cannot be lifted out of the cylindrical receptacle in the z-direction.
  • a slide washer 14a which forms a washer.
  • the contour of the underside of the sliding disk 14a is adapted to the contour of the upper side of the clip 3 in the area of the elongated hole, so that the sliding disk 14a lies flat there, for any position of the screw 14 within the elongated hole 15.
  • a screw 14 is provided on each clamp 3 as clamping means.
  • Each screw 14 passes through a slot 15 in the respective clamp 3 and engages in one at the interface 7 of the lower jaw 2 exiting threaded hole 16.
  • the longitudinal direction of the elongated hole 15 runs in the longitudinal direction of the clamp 3, whereby tilting of the clamp 3 in its longitudinal direction during the clamping process is absorbed and the screw 14 does not jam in the elongated hole 15.
  • the segment of the screw 14 that lies between the clamp 3 and the lower jaw 2 can be surrounded by a spring.
  • a slide washer 14a which forms a washer.
  • the contour of the underside of the sliding disk 14a is adapted to the contour of the upper side of the clamp 3 in the area of the elongated hole 15, so that the sliding disk 14a lies flat there, for any position of the screw 14 within the elongated hole 15.
  • the slot 15 for receiving the screw 14 is, in particular from the Figures 2 and 3 visible, in the area of the center of the clamp 3 between the cylinder segment 13 in the rear area of the clamp 3 and the front edge 17 of the clamp 3, which is used for clamping the workpiece 11.
  • the front edges 17 of the brackets 3 are perpendicular to the longitudinal axes of the brackets 3 and thus parallel to the longitudinal axis of the bearing surface 10 of the lower jaw 2. As in particular from the Figures 2 and 3 As can be seen, the front edge 17 of each clip 3 is rounded, with the respective front edge 17 having a cross section in the shape of a segment of a circle.
  • a workpiece 11 to be clamped is placed on the support surface 10 of the lower jaw 2 and then fixed with the front edge 17 of each clamp 3 .
  • the rounding of the front edge 17 of the clip 3 ensures that no flat but an exact linear support of the front edge 17 of the clamp 3 on the workpiece 11 is obtained and thus a clamping force acting exactly in the z-direction against the supporting surface 10, which enables precise clamping of the workpiece 11.
  • the precision of the clamping process is promoted by the horizontal contact surface 10 of the lower jaw 2. For clamping larger workpieces 11, it can be useful if the bearing surface 10 rises by fractions of a degree towards the front edge of the lower jaw 2.
  • each clip 3 can be seen to match the contour of the lower jaw 2 , in particular to the contour of the upper side of the lower jaw 2 .
  • the front part of a clip 3 is adapted to the underlying inclined surface 8 of the lower jaw 2 in that the front part is delimited by two flat surfaces 18, 19 converging at an acute angle.
  • each clamp 3 has a stop 20 to limit the opening width of the clamp 3 .
  • This stop 20 is provided on the underside of the rear edge area of the clip 3, which protrudes beyond the cylinder segment 13.
  • the lower jaw 2 is divided by a slot 32 into an upper segment 2a and a lower segment 2b.
  • the slot 32 extends over the entire width of the lower jaw 2 and opens out at the opposite side walls.
  • the slot 32 runs essentially in a horizontal plane and runs into the rear area of the lower jaw 2 in the area of the recess 12. There the slot 32 ends in a spiral 32a. The slot 32 extends into the front area of the lower jaw 2 up to the front edge of the contact surface 4. There the slot 32 has a wave-shaped end segment 32b.
  • FIG. 4b shows, in the lower jaw 2 a slot-shaped receptacle 33 is provided, which serves to receive a fastening screw, not shown, with which the lower jaw 2 is fastened to the base.
  • the slot-shaped receptacle 33 consists of a first slot segment 33a in the upper segment 2a and a second slot segment 33b in the lower segment 2b of the lower jaw 2, the cross section of the first slot segment 33a in the upper segment 2a being larger than the cross section of the second slot segment 33b in the lower segment 2 B.
  • the fastening screw is thus guided with play in the first elongated hole segment 33a of the upper segment 2a and fixed by engaging in the screw surfaces formed by the edges of the second elongated hole segment 33b of the lower segment 2b.
  • the lower jaw 2 is attached to the base solely via the lower segment 2b, not via the upper segment 2a.
  • threaded bores 34 are provided in the upper segment 2a symmetrically to the axis of symmetry of the lower jaw 2.
  • the threaded bores 34 each have internal threads in the form of fine threads.
  • Adjusting screws 35 forming adjusting means are guided in the threaded bores 34, the adjusting screws 35 also being of identical design.
  • Each adjusting screw 35 has a pin-shaped end piece 35a at its lower end.
  • the upper segment 2a with the bearing surface 10 can be finely adjusted laterally in two spatial directions.
  • the clamping device 1 is particularly suitable for use in wire EDM machines. How out figure 4 As can be seen, the components required for spark erosion, namely one or more wires 21 and nozzles 22, 23 for a liquid dielectric, can be brought very close to the clamping device 1, so that very flat, small workpieces 11 can also be machined.
  • upper nozzles 22 can be arranged directly in the area of the front parts of the clamps 3.
  • lower nozzles 23 can be arranged directly below the front end of the lower jaw 2 , with the bevel 6 at the front end of the lower jaw 2 enabling the nozzles 23 to be brought very close to the lower jaw 2 .
  • FIG 5 shows the clamping device 1 according to the Figures 1 to 4 with the workpiece 11 removed.
  • the rear clamp 3 is still lifted off the lower jaw 2, while the front clamp 3 can be tightened by tightening the screw 14 is pressed against the lower jaw 2, so that the underside of the clip 3, with the exception of the front edge 17, rests tightly on the upper side of the lower jaw 2.
  • the area of the front edge 17 of the clamp 3 resting on the lower jaw 2 is in figure 6 shown enlarged in a detail view.
  • the shoulder 9 of the lower jaw 2 is adjoined by the narrow surface segment 9a, which is oriented in a horizontal plane and then merges into the inclined surface 8.
  • the edge area of the clip 3 adjoining the rounded front edge 17 rests on the surface segment 9a and the inclined surface 8, while the front edge 17 protrudes over the shoulder 9 and is at a small distance from the support surface 10. This avoids the front edge 17 being pressed against the support surface 10 when the clamp 3 is placed on the upper side of the lower jaw 2, so that damage to or impairment of these components is avoided.
  • the figures 7 and 8th show an extension of the clamping device 1 of Figures 1 to 6 .
  • the clamping device 1 of figures 7 and 8th has an adapter 25 as an additional module, which is arranged between the lower jaw 2 and the clamps 3 .
  • the adapter 25, which is in figure 9 is shown in an individual representation is designed as a solid part, which has a cylinder segment 26 on its underside that corresponds to the cylinder segment 13 of the clamps 3 in terms of its contour.
  • a recess 27 provided, which corresponds to the recess 12 of the lower jaw 2.
  • the adapter 25 has threaded holes 28 opening out on its upper side, which correspond to the threaded holes 16 of the lower jaw 2 .
  • the adapter 25 has a recess 29 which opens out on its front side 30 and closes over the entire width of the adapter 25 .
  • a magnet 31 is inserted into the recess 29 .
  • the magnet 31 is flush with the front side 30 and forms a flat surface with it.
  • the configuration of the jig 1 of figure 1 can in the configuration of figures 7 and 8th can be converted simply by removing the clips 3 from the lower jaw 2 and then attaching the adapter 25 to the lower jaw 2 by inserting the cylinder segment 26 of the adapter 25 into the recess 12 of the lower jaw 2. Then the cylinder segments 13 of the clamps 3 are inserted into the recess 27 of the adapter 25 . In principle, this can in turn be done by laterally pushing in the cylinder segments 13 of the clamps 3 into the recess 27 of the adapter 25 .
  • the contours of the cylinder segments 13 of the clamps 3 are modified compared to the embodiment of FIGS. 1 to 6 in such a way that the cylinder segments 13 can be inserted into the recess 27 from above and are then fixed in position there by turning into their working positions.
  • the clamps 3 are then mounted pivotably on the adapter 25, with the clamping processes again taking place by actuating the screws 14, which now engage in the threaded bores 28 of the adapter 25.

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  • Mechanical Engineering (AREA)
  • Jigs For Machine Tools (AREA)

Description

Die Erfindung betrifft eine Spannvorrichtung.The invention relates to a clamping device.

Dabei bezieht sich die Erfindung insbesondere auf eine Spannvorrichtung für Drahterodiermaschinen. Derartige Drahterodiermaschinen arbeiten nach dem Prinzip der Funkenerosion, wobei mit einem Draht in einem flüssigen Dielektrikum in Werkstücke bestimmte Formen, Konturen und dergleichen eingeschnitten werden. Um bei dieser Bearbeitung die Werkstücke in einer vorgegebenen Bearbeitungsposition zu halten, werden Spannvorrichtungen eingesetzt.The invention relates in particular to a clamping device for wire EDM machines. Wire EDM machines of this type work on the principle of spark erosion, with a wire in a liquid dielectric being used to cut specific shapes, contours and the like into workpieces. Clamping devices are used to hold the workpieces in a predetermined machining position during this machining.

Bekannte hierfür eingesetzte Spannvorrichtungen sind jeweils in Form eines Schraubstocks ausgebildet, bei welchen mittels Spindeln Spannbacken aufeinander zugeführt werden, um die Werkstücke zu spannen.Known clamping devices used for this purpose are each designed in the form of a vice, in which clamping jaws are fed to one another by means of spindles in order to clamp the workpieces.

Ein erster Nachteil dieser Spannvorrichtung besteht darin, dass die Spindeln im Laufe der Zeit verschmutzen und daher in bestimmten Zeitintervallen gereinigt und gewartet werden müssen. Die im Innern der Spannvorrichtung angeordneten Spindeln sind nicht oder nur mit großem Aufwand ausbaubar. Das Reinigen und Warten der Spindeln bringt daher einen großen Zeit- und Kostenaufwand mit sich.A first disadvantage of this clamping device is that the spindles become dirty over time and therefore have to be cleaned and serviced at certain time intervals. The spindles arranged inside the clamping device cannot be removed or can only be removed with great effort. The cleaning and maintenance of the spindles therefore involves a great deal of time and money.

Ein weiterer Nachteil der als Schraubstöcke ausgebildeten Spannvorrichtungen besteht darin, dass deren Bauformen mangelhaft an die Arbeitsprozesse von Drahterodiermaschinen anpassbar sind. Derartige Schraubstöcke bestehen typischerweise aus einem quaderförmigen Grundkörper, der Aussparungen aufweist, in welchen mit Spindeln getriebene Spannbacken bewegbar sind. Generell münden diese Aussparungen an einer senkrechten Seitenwand des quaderförmigen Grundkörpers des Schraubstocks aus. Dort müssen die jeweiligen Werkstücke eingeschoben werden, um sie spannen zu können. Dies bereitet insbesondere bei kleinen und flachen Werkstücken, wie sie mit Drahterodiermaschinen typischerweise bearbeitet werden, erhebliche Probleme. Ein weiteres Problem besteht darin, dass die Komponenten der Drahterodiermaschinen zur Bearbeitung der Werkstücke, insbesondere Düsen, über welche das flüssige Dielektrikum ausgeleitet wird, bei kleinen Werkstücken sehr dicht an die Spannvorrichtung herangeführt werden müssen. Bei als Schraubstöcken ausgebildeten Spannvorrichtungen ist dies jedoch aufgrund des sperrigen, quaderförmigen Grundkörpers nicht oder nur unzureichend möglich.A further disadvantage of the clamping devices designed as vices is that their designs cannot be easily adapted to the working processes of wire EDM machines. Such vices typically consist of a cuboid base body which has recesses in which clamping jaws driven by spindles can be moved. In general, these recesses open out on a vertical side wall of the cuboid body of the vice. The respective workpieces must be inserted there in order to be able to clamp them. This causes considerable problems, especially in the case of small and flat workpieces, such as are typically machined with wire EDM machines. Another problem is that the components of the wire EDM machines for machining the workpieces, in particular nozzles through which the liquid dielectric is discharged, have to be brought very close to the clamping device for small workpieces. In the case of clamping devices designed as vices, however, this is not possible or only insufficiently possible due to the bulky, cuboid base body.

Aus der EP 2 226 145 ist eine Spannvorrichtung bekannt, die eine Unterbacke aufweist, an deren Vorderkante eine zumindest näherungsweise in einer horizontalen Ebene verlaufende Auflagefläche für ein zu spannendes Werkstück vorgesehen ist. Weiter ist oberhalb der Unterbacke wenigstens eine Klammer angeordnet, die im Bereich ihres hinteren Endes schwenkbar an der Oberseite der Unterbacke gelagert ist. Durch Betätigen eines Spannmittels ist die Klammer gegen die Oberseite der Unterbacke geführt, wodurch die Vorderkante der Klammer gegen die Oberseite des auf der Auflagefläche liegenden Werkstücks gepresst ist.From the EP 2 226 145 a clamping device is known which has a lower jaw, on the front edge of which there is a support surface, which runs at least approximately in a horizontal plane, for a workpiece to be clamped. Furthermore, at least one clamp is arranged above the lower jaw, which is mounted pivotably on the upper side of the lower jaw in the region of its rear end. By actuating a clamping device, the clamp is guided against the upper side of the lower jaw, as a result of which the front edge of the clamp is pressed against the upper side of the workpiece lying on the support surface.

Der Erfindung liegt die Aufgabe zugrunde, eine Spannvorrichtung bereitzustellen, die eine weiter verbesserte Funktionalität aufweist.The invention is based on the object of providing a tensioning device which has further improved functionality.

Zur Lösung dieser Aufgabe sind die Merkmale des Anspruchs 1 vorgesehen. Vorteilhafte Ausführungsformen und zweckmäßige Weiterbildungen der Erfindung sind in den abhängigen Ansprüche beschrieben.To solve this problem, the features of claim 1 are provided. Advantageous embodiments and expedient developments of the invention are described in the dependent claims.

Die Erfindung betrifft eine Spannvorrichtung mit einer Unterbacke, an deren Vorderkante eine zumindest näherungsweise in einer horizontalen Ebene verlaufende Auflagefläche für ein zu spannendes Werkstück vorgesehen ist, und mit wenigstens einer oberhalb der Unterbacke angeordneten Klammer, die im Bereich ihres hinteren Endes schwenkbar an der Oberseite der Unterbacke gelagert ist. Durch Betätigen eines Spannmittels ist die Klammer gegen die Oberseite der Unterbacke geführt, wodurch die Vorderkante der Klammer gegen die Oberseite des auf der Auflagefläche liegenden Werkstücks gepresst ist. In der Unterbacke verläuft ein Schlitz, welcher ein oberes Segment von einem unteren Segment trennt. Die Unterseite des unteren Segments bildet eine Anlegfläche zur Auflage auf einer Unterlage aus. Am oberen Segment ist die Vorderkante mit der Auflagefläche vorgesehen. Weiterhin sind im oberen Segment Justagemittel zur Justage der Vorderkante vorgesehen.The invention relates to a clamping device with a lower jaw, on the front edge of which there is a support surface running at least approximately in a horizontal plane for a workpiece to be clamped, and with at least one clamp arranged above the lower jaw, which in the Area of its rear end is pivotally mounted on the top of the lower jaw. By actuating a clamping device, the clamp is guided against the upper side of the lower jaw, as a result of which the front edge of the clamp is pressed against the upper side of the workpiece lying on the support surface. A slot runs in the lower jaw, separating an upper segment from a lower segment. The underside of the lower segment forms a contact surface for resting on a base. The front edge with the bearing surface is provided on the upper segment. Furthermore, adjustment means for adjusting the front edge are provided in the upper segment.

Mit der erfindungsgemäßen Spannvorrichtung wird ein hochpräzises Spannen von Werkstücken ermöglicht, wobei sich die Spannvorrichtung insbesondere zum Spannen kleiner Werkstücke eignet. Die Unterbacke und die Klammer als Komponenten der Spannvorrichtung zum Spannen eines Werkstücks sind der Form zweier menschlicher Finger nachempfunden, die einen Gegenstand halten. Dies bedeutet, dass die Unterbacken und die Klammer flach auf das zu spannende Werkstück zulaufen. Dies bringt als wesentlichen Vorteil mit sich, dass am Ort der Einspannung des Werkstücks die Werkstückumgebung nicht durch die Spannvorrichtung versperrt oder verbaut ist, so dass Mittel zur Bearbeitung des Werkstücks unmittelbar an dieses herangeführt werden können.With the clamping device according to the invention, high-precision clamping of workpieces is made possible, with the clamping device being particularly suitable for clamping small workpieces. The lower jaw and the clamp as components of the clamping device for clamping a workpiece are modeled on the shape of two human fingers holding an object. This means that the lower jaws and the clamp run flat towards the workpiece to be clamped. This has the significant advantage that at the location where the workpiece is clamped, the area around the workpiece is not blocked or obstructed by the clamping device, so that means for processing the workpiece can be brought directly to it.

Die erfindungsgemäße Spannvorrichtung eignet sich somit besonders vorteilhaft für den Einsatz in Drahterodiermaschinen. Der Draht der Drahterodiermaschine sowie die Düsen für das flüssige Dielektrikum als weitere Komponenten der Drahterodiermaschine können somit sehr dicht an die Spannvorrichtung herangeführt werden, so dass auch eine Bearbeitung sehr kleiner Werkstücke ohne weiteres möglich ist.The clamping device according to the invention is therefore particularly advantageously suitable for use in wire EDM machines. The wire of the wire EDM machine and the nozzles for the liquid dielectric as further components of the wire EDM machine can thus be brought very close to the clamping device, so that machining of very small workpieces is also easily possible.

Ein weiterer wesentlicher Vorteil der erfindungsgemäßen Spannvorrichtung besteht darin, dass mit dieser ein hochpräzises Spannen von Werkstücken ermöglicht wird.Another important advantage of the clamping device according to the invention is that it enables workpieces to be clamped with high precision.

Dies wird erfindungsgemäß auch dadurch erreicht, dass in der Unterbacke ein Schlitz verläuft, durch welchen eine kräftemäßige Entkopplung zwischen dem oberen Segment und dem unteren Segment der Unterbacke erhalten wird.According to the invention, this is also achieved in that a slot runs in the lower jaw, through which a force-related decoupling between the upper segment and the lower segment of the lower jaw is obtained.

Das untere Segment dient zur Ankopplung der Unterbacke an eine Unterlage, während das obere Segment mit der Vorderkante und seiner Auflagefläche das Mittel zum Spannen des Werkstücks aufweist. Dadurch, dass das untere Segment und das obere Segment durch den Schlitz entkoppelt sind, wird durch die Befestigung der Unterbacke an einer Unterlage eine Ausrichtung des Mittels zum Spannen des Werkstücks, nämlich die Vorderkante mit der Auflagefläche, nicht beeinträchtigt, wodurch die Präzision der Spannvorrichtung erhöht wird.The lower segment is used to couple the lower jaw to a base, while the upper segment, with the front edge and its support surface, has the means for clamping the workpiece. Due to the fact that the lower segment and the upper segment are decoupled by the slot, the attachment of the lower jaw to a base does not impair the alignment of the means for clamping the workpiece, namely the front edge with the support surface, which increases the precision of the clamping device becomes.

Gemäß einer vorteilhaften Ausführungsform weist die Unterbacke eine langlochförmige Aufnahme zur Aufnahme einer Befestigungsschraube auf, mittels derer die Unterbacke an der Unterlage fixierbar ist.According to an advantageous embodiment, the lower jaw has a slot-shaped receptacle for receiving a fastening screw, by means of which the lower jaw can be fixed to the base.

Dabei weist die langlochförmige Aufnahme ein Langlochsegment im oberen Segment, in welchem eine Befestigungsschraube mit Spiel geführt ist, und ein Langlochsegment im unteren Segment auf, wobei die das Langlochsegment begrenzenden Ränder des unteren Segments Schraubflächen zur Lagerung der Befestigungsschrauben bilden.The slot-shaped receptacle has a slot segment in the upper segment, in which a fastening screw is guided with play, and a slot segment in the lower segment, the edges of the lower segment delimiting the slot segment forming screw surfaces for mounting the fastening screws.

Da somit die Befestigungsschraube nur in Eingriff mit dem unteren Segment der Unterbacke ist, ist das obere Segment von der Befestigung an der Unterlage völlig entkoppelt, so dass die Präzision des Spannens des Werkstücks durch das Befestigen der Unterbacke auf der Unterlage nicht beeinträchtigt ist.Since the fastening screw is only in engagement with the lower segment of the lower jaw, the upper segment is completely decoupled from the attachment to the base, so that the precision of the clamping of the workpiece is not affected by the attachment of the lower jaw to the base.

Um eine vollständige Entkopplung des unteren Segments von dem oberen Segment zu erhalten, erstreckt sich der Schlitz über die gesamte Breite der Unterbacke und mündet an deren seitlichen Rändern aus.In order to obtain a complete decoupling of the lower segment from the upper segment, the slot extends over the entire width of the lower jaw and opens out at the lateral edges thereof.

Vorteilhaft verläuft der Schlitz im Wesentlichen in einer horizontalen Ebene.Advantageously, the slot runs essentially in a horizontal plane.

Dabei weist der Schlitz in einem hinteren, der Vorderkante abgewendeten Bereich der Unterbacke ein spiralförmiges Endsegment auf.In this case, the slot has a spiral-shaped end segment in a rear area of the lower jaw that is averted from the front edge.

Durch das spiralförmige Auslaufen des Schlitzes werden einwirkende Kräfte so aufgenommen, dass ein Aufreißen des Schlitzes bei Krafteinwirkungen vermieden wird.Due to the spiral shape of the slit, acting forces are absorbed in such a way that the slit is prevented from tearing open when force is applied.

Vorteilhaft weist der Schlitz in einem vorderen, der Vorderkante zugewandten Bereich ein am vorderen Rand der Anlegfläche ausmündendes Endsegment auf.In a front area facing the front edge, the slot advantageously has an end segment opening out at the front edge of the contact surface.

Damit ist das untere Segment so dimensioniert, dass es die Anlegfläche vollständig umfasst und mit dieser vom oberen Segment durch den Schlitz abgegrenzt ist.The lower segment is thus dimensioned in such a way that it completely encompasses the contact surface and is delimited with it from the upper segment by the slot.

Besonders vorteilhaft ist die Querschnittslinie des Endsegments wellenförmig.The cross-section line of the end segment is particularly advantageously wavy.

Durch die Wellenform des Schlitzes werden Bewegungen des oberen Segments relativ zum unteren Segment begrenzt, wodurch bei einwirkenden Kräften Beschädigungen der Unterbacke vermieden werden.The wavy shape of the slot limits movement of the upper segment relative to the lower segment, preventing damage to the lower jaw when forces are applied.

Mit den erfindungsgemäßen Justagemitteln kann die Vorderkante mit der Auflagefläche, die zum Spannen des Werkstücks dient, genau ausgerichtet werden, wodurch ein äußerst präziser Spannvorgang gewährleistet ist. Erfindungsgemäß sind die Justagemittel im oberen Segment der Unterbacke vorgesehen und damit von den Befestigungsmitteln zur Befestigung der Unterbacke auf der Unterlage, die im unteren Segment angeordnet sind, entkoppelt, so dass die Justage mit am Justagemittel unbeeinträchtigt von der Befestigung der Unterbacke auf der Unterlage ist.With the adjustment means according to the invention, the front edge can be precisely aligned with the support surface that is used to clamp the workpiece, which ensures an extremely precise clamping process. According to the invention, the adjustment means are provided in the upper segment of the lower jaw and are thus decoupled from the fastening means for fastening the lower jaw on the base, which are arranged in the lower segment, so that the adjustment with the adjustment means is unaffected by the fastening of the lower jaw on the base.

Besonders vorteilhaft sind die Justagemittel von Justierschrauben gebildet, die in die Aufnahmen bildenden Gewindebohrungen im oberen Segment geführt sind.The adjusting means are particularly advantageously formed by adjusting screws, which are guided into the threaded bores forming the receptacles in the upper segment.

Durch das Einschrauben der Justierschrauben in die vorzugsweise als Feingewinde ausgebildeten Gewindebohrungen ist eine hochgenaue Justage der Lage der Auflagefläche möglich.By screwing the adjusting screws into the threaded bores, which are preferably designed as fine threads, a highly precise adjustment of the position of the bearing surface is possible.

Vorteilhaft weist jede Justierschraube in ihrem unteren Ende ein zapfenförmiges Endstück auf. Bei in der Gewindebohrung gelagerte Justierschraube steht das zapfenförmige Endstück über den unteren offenen Rand der Gewindebohrung hervor und drückt gegen das obere Segment.Advantageously, each adjusting screw has a peg-shaped end piece in its lower end. When the adjusting screw is mounted in the threaded hole, the pin-shaped end piece protrudes beyond the lower open edge of the threaded hole and presses against the upper segment.

Damit wird ein definierter Anpressdruck der Justierschraube gegen das untere Segment erzielt.This achieves a defined contact pressure of the adjusting screw against the lower segment.

Gemäß einer vorteilhaften Ausführungsform sind zwei Justagemittel vorgesehen.According to an advantageous embodiment, two adjustment means are provided.

Dabei sind die Justagemittel und die zugeordneten Aufnahmen jeweils identisch ausgebildet.In this case, the adjustment means and the associated receptacles are each configured identically.

Weiterhin weist die Unterbacke eine langlochförmige Aufnahme zur Aufnahme einer Befestigungsschraube auf, mittels derer die Unterbacke an der Unterlage fixierbar ist.Furthermore, the lower jaw has a slot-shaped receptacle for receiving a fastening screw, by means of which the lower jaw can be fixed to the base.

Bei der Montage der Spannvorrichtung wird durch die Befestigung der Unterbacke die Vorderkante mit der Auflagefläche in Richtung der Längsachsen der Unterbacke ausgerichtet. Mit den symmetrisch zur Längsachse liegenden Justierschraube kann dann in zwei Raumrichtungen eine laterale Justage der Unterbacke erfolgen, so dass diese in allen Raumrichtungen exakt ausgerichtet ist.When assembling the clamping device, the front edge is aligned with the bearing surface in the direction of the longitudinal axes of the lower jaw by fastening the lower jaw. The lower jaw can then be laterally adjusted in two spatial directions with the adjusting screw lying symmetrically to the longitudinal axis, so that it is exactly aligned in all spatial directions.

Die Erfindung wird im Folgenden anhand der Zeichnungen erläutert. Es zeigen:

Figur 1:
Perspektivische Darstellung eines Ausführungsbeispiels der erfindungsgemäßen Spannvorrichtung mit einer Unterbacke und zwei darauf angeordneten Klammern.
Figur 2:
Seitenansicht der Spannvorrichtung gemäß Figur 1.
Figur 3:
Seitenansicht der Spannvorrichtung gemäß Figur 1 mit zugeordneten Komponenten einer Drahterodiermaschine.
Figur 4:
Einzeldarstellung der Unterbacke der Spannvorrichtung gemäß den Figuren 1 bis 3.
  1. a) Perspektivische Darstellung
  2. b) In einer Draufsicht von oben
  3. c) In einer Seitenansicht
Figur 5:
Seitenansicht der Spannvorrichtung gemäß Figur 1 ohne Werkstück.
Figur 6:
Vergrößerte Detaildarstellung der Anordnung gemäß Figur 5.
Figur 7:
Perspektivische Darstellung der Spannvorrichtung gemäß den Figuren 1 bis 6 mit einem zwischen der Unterbacke und den Klammern liegenden Adapter.
Figur 8:
Seitenansicht der Anordnung gemäß Figur 7.
Figur 9:
Einzeldarstellung des Adapters gemäß den Figuren 7 und 8.
The invention is explained below with reference to the drawings. Show it:
Figure 1:
Perspective view of an embodiment of the clamping device according to the invention with a lower jaw and two clamps arranged on it.
Figure 2:
Side view of the clamping device according to figure 1 .
Figure 3:
Side view of the clamping device according to figure 1 with associated components of a wire EDM machine.
Figure 4:
Individual representation of the lower jaw of the clamping device according to Figures 1 to 3 .
  1. a) Perspective view
  2. b) In a plan view from above
  3. c) In a side view
Figure 5:
Side view of the clamping device according to figure 1 without workpiece.
Figure 6:
Enlarged detail view of the arrangement according to figure 5 .
Figure 7:
Perspective view of the clamping device according to FIGS. 1 to 6 with an adapter located between the lower jaw and the clamps.
Figure 8:
Side view according to the arrangement figure 7 .
Figure 9:
Individual representation of the adapter according to figures 7 and 8th .

Die Figuren 1 bis 3 zeigen ein Ausführungsbeispiel der erfindungsgemäßen Spannvorrichtung 1. Im vorliegenden Fall wird die Spannvorrichtung 1 für eine Drahterodiermaschine eingesetzt. Figur 3 zeigt die Spannvorrichtung 1 mit Komponenten einer solchen Drahterodiermaschine.The Figures 1 to 3 show an exemplary embodiment of the clamping device 1 according to the invention. In the present case, the clamping device 1 is used for a wire EDM machine. figure 3 shows the clamping device 1 with components of such a wire EDM machine.

Die in den Figuren 1 bis 3 dargestellte Spannvorrichtung 1 umfasst eine Unterbacke 2 und zwei auf der Oberseite der Unterbacke 2 angeordnete, an dieser schwenkbar gelagerte Klammern 3. Die Klammern 3 sind im vorliegenden Fall identisch ausgebildet. Generell kann die Spannvorrichtung 1 auch eine Unterbacke 2, an welcher nur eine oder mehr als zwei Klammern 3 angeordnet sind, aufweisen. Die Unterbacke 2 ist in Figur 4a in einer Einzeldarstellung dargestellt.The in the Figures 1 to 3 The clamping device 1 shown comprises a lower jaw 2 and two clamps 3 which are arranged on the upper side of the lower jaw 2 and are pivotably mounted on it. In the present case, the clamps 3 are of identical design. In general, the clamping device 1 can also be a Have lower jaw 2, on which only one or more than two brackets 3 are arranged. Lower jaw 2 is in Figure 4a shown in a single representation.

Die Unterbacke 2 und die Klammern 3 bestehen jeweils aus nicht rostendem Stahl. Wie insbesondere aus den Figuren 3 und 4a ersichtlich ist, bildet die Unterbacke 2 ein flaches, massives Bauteil, dessen Querschnitt in y-Richtung konstant ist. An der Unterseite weist die Unterbacke 2 eine in einer horizontalen Ebene (das heißt in einer x-y-Ebene) verlaufende Anlegfläche 4 auf, mit welcher die Unterbacke 2 auf einer Unterlage, insbesondere auf einem Aufspanntisch der Drahterodiermaschine positionierbar und fixierbar ist. An der Unterseite ist, durch einen Absatz von der Anlegfläche 4 nach unten abgesetzt, eine weitere, in einer horizontalen Ebene verlaufende Fläche 5 vorgesehen. Am vorderen Ende der Unterbacke 2 weist diese eine an die Fläche 5 angrenzende Abschrägung 6 auf.The lower jaw 2 and the brackets 3 are each made of stainless steel. As in particular from the Figures 3 and 4a As can be seen, the lower jaw 2 forms a flat, solid component whose cross section is constant in the y-direction. On the underside, the lower jaw 2 has a contact surface 4 running in a horizontal plane (that is, in an xy plane), with which the lower jaw 2 can be positioned and fixed on a base, in particular on a clamping table of the wire EDM machine. Another surface 5 running in a horizontal plane is provided on the underside, set off downwards from the contact surface 4 by a step. At the front end of the lower jaw 2 , the lower jaw has a bevel 6 adjoining the surface 5 .

Im Bereich der Anlegfläche 4 weist die Unterbacke 2 an ihrer Oberseite eine, in einer horizontalen Ebene, Grenzfläche 7 auf, an welche zur Vorderseite hin eine Schrägfläche 8 anschließt. An die vordere Kante der Schrägfläche 8 schließt, durch einen Absatz 9 getrennt, eine in einer horizontalen Ebene verlaufende Auflagefläche 10 an, auf welche ein zu spannendes Werkstück 11 aufgelegt werden kann, wie aus den Figuren 1 bis 3 ersichtlich ist. Dabei geht der Absatz 9 nicht direkt in die Schrägfläche 8 über, sondern ist von dieser durch ein schmales Flächensegment 9a getrennt, das in einer Ebene parallel zur Auflagefläche 10 verläuft.In the area of the contact surface 4, the lower jaw 2 has a boundary surface 7 in a horizontal plane on its upper side, which is adjoined by a sloping surface 8 towards the front. At the front edge of the inclined surface 8 closes, separated by a shoulder 9, a running in a horizontal plane bearing surface 10 on which a workpiece 11 to be clamped can be placed, as shown in FIGS Figures 1 to 3 is evident. The shoulder 9 does not merge directly into the inclined surface 8, but is separated from it by a narrow surface segment 9a, which runs parallel to the bearing surface 10 in a plane.

Die Auflagefläche 10 erstreckt sich über die gesamte Breite der Unterbacke 2, wobei deren Form über die gesamte Breite der Unterbacke 2 konstant ist. Die Auflagefläche 10 ist gehärtet und geschliffen und bildet so eine reproduzierbare, verschleißfreie Auflage für das Werkstück 11. Dabei liegt die Auflagefläche 10 in derselben Ebene wie die Anlegefläche 4. Damit bleibt der durch die Anlegefläche 4 definierte Maschinennullpunkt für die Auflagefläche 10 und damit das dort aufliegende Werkstück 11 erhalten.The bearing surface 10 extends over the entire width of the lower jaw 2, the shape of which is constant over the entire width of the lower jaw 2. The contact surface 10 is hardened and ground and thus forms a reproducible, wear-free support for the workpiece 11. The contact surface 10 lies in the same plane as the contact surface 4 Contact surface 4 defined machine zero point for the support surface 10 and thus receive the workpiece 11 lying there.

Die Klammern 3 bilden langgestreckte Bauteile mit parallel in x-Richtung verlaufende Längsachsen. Die Klammern 3 sind jeweils mit einer Schwenkhalterung an der Unterbacke 2 schwenkbar gelagert. Zur Ausbildung der Schwenkhalterungen weist die Unterbacke 2 eine zylindrische Ausnehmung 12 als Aufnahme für an den Unterseiten der Klammern 3 vorgesehene Zylindersegmente 13 auf. Die zylindrische Aufnahme erstreckt sich in y-Richtung über die gesamte Breite der Unterbacke 2 und mündet an deren Seitenwänden aus. Die zylindrische Aufnahme weist einen über ihre gesamte Länge konstanten Querschnitt auf, wobei der Querschnitt ein Kreissegment bildet, welches sich über einen Winkelbereich erstreckt, der geringfügig größer ist als 180°. Die Konturen der Zylindersegmente 13 sind exakt an die Kontur der zylindrischen Aufnahme angepasst, das heißt auch die Zylindersegmente 13 weisen jeweils einen über ihre Länge konstanten Querschnitt in Form eines Kreissegments auf. Die Zylindersegmente 13 der Klammern 3 können zur Montage der Spannvorrichtung 1 seitlich in die zylindrische Aufnahme eingeschoben werden. Da sich der kreisförmige Querschnitt der zylindrischen Aufnahme über einen Winkelbereich größer als 180° erstreckt, können die Zylindersegmente 13 nicht in z-Richtung aus der zylindrischen Aufnahme herausgehoben werden.The clamps 3 form elongated components with longitudinal axes running parallel in the x-direction. The clamps 3 are each mounted pivotably on the lower jaw 2 with a pivoting mount. In order to form the swivel mounts, the lower jaw 2 has a cylindrical recess 12 as a receptacle for cylinder segments 13 provided on the undersides of the clamps 3 . The cylindrical receptacle extends in the y-direction over the entire width of the lower jaw 2 and ends at its side walls. The cylindrical receptacle has a cross section that is constant over its entire length, the cross section forming a segment of a circle that extends over an angular range that is slightly larger than 180°. The contours of the cylinder segments 13 are precisely adapted to the contour of the cylindrical receptacle, ie the cylinder segments 13 also each have a cross section in the form of a circular segment that is constant over their length. The cylinder segments 13 of the clamps 3 can be pushed laterally into the cylindrical receptacle for mounting the clamping device 1 . Since the circular cross section of the cylindrical receptacle extends over an angular range greater than 180°, the cylinder segments 13 cannot be lifted out of the cylindrical receptacle in the z-direction.

Zwischen dem Kopf der Schraube 14 und dem deren Rand des Langlochs 15 ist eine Gleitscheibe 14a vorgesehen, die eine Unterlagscheibe bildet. Dabei ist die Kontur der Unterseite der Gleitscheibe 14a an die Kontur der Oberseite der Klammer 3 im Bereich des Langlochs angepasst, so dass die Gleitscheibe 14a dort flächig aufliegt, und zwar für beliebige Positionen der Schraube 14 innerhalb des Langlochs 15.Between the head of the screw 14 and the edge of the slot 15 there is a slide washer 14a which forms a washer. The contour of the underside of the sliding disk 14a is adapted to the contour of the upper side of the clip 3 in the area of the elongated hole, so that the sliding disk 14a lies flat there, for any position of the screw 14 within the elongated hole 15.

Zur Betätigung der Spannvorrichtung 1 ist an jeder Klammer 3 als Spannmittel eine Schraube 14 vorgesehen. Jede Schraube 14 durchsetzt ein Langloch 15 in der jeweiligen Klammer 3 und greift in eine an der Grenzfläche 7 der Unterbacke 2 ausmündende Gewindebohrung 16. Durch Betätigen des an der Oberseite der Klammer 3 beiliegenden Kopfs der Schraube 14 kann die jeweilige Klammer 3 gegen die Unterbacke 2 geführt werden, um das Werkstück 11 zu spannen. Die Längsrichtung des Langlochs 15 verläuft in Längsrichtung der Klammer 3, wodurch Verkippungen der Klammer 3 in deren Längsrichtung beim Spannvorgang aufgenommen werden und die Schraube 14 nicht im Langloch 15 verklemmt. Zur Generierung einer Rückstellkraft bei Betätigen der Schraube 14 kann das Segment der Schraube 14, das zwischen Klammer 3 und Unterbacke 2 liegt, von einer Feder umgeben sein.To actuate the clamping device 1, a screw 14 is provided on each clamp 3 as clamping means. Each screw 14 passes through a slot 15 in the respective clamp 3 and engages in one at the interface 7 of the lower jaw 2 exiting threaded hole 16. By actuating the head of the screw 14 attached to the upper side of the clamp 3, the respective clamp 3 can be guided against the lower jaw 2 in order to clamp the workpiece 11. The longitudinal direction of the elongated hole 15 runs in the longitudinal direction of the clamp 3, whereby tilting of the clamp 3 in its longitudinal direction during the clamping process is absorbed and the screw 14 does not jam in the elongated hole 15. To generate a restoring force when the screw 14 is actuated, the segment of the screw 14 that lies between the clamp 3 and the lower jaw 2 can be surrounded by a spring.

Zwischen dem Kopf der Schraube 14 und dem oberen Rand des Langlochs 15 ist eine Gleitscheibe 14a vorgesehen, die eine Unterlagscheibe bildet. Dabei ist die Kontur der Unterseite der Gleitscheibe 14a an die Kontur der Oberseite der Klammer 3 im Bereich des Langlochs 15 angepasst, so dass die Gleitscheibe 14a dort flächig aufliegt, und zwar für beliebige Positionen der Schraube 14 innerhalb des Langlochs 15.Between the head of the screw 14 and the upper edge of the elongated hole 15 there is a slide washer 14a which forms a washer. The contour of the underside of the sliding disk 14a is adapted to the contour of the upper side of the clamp 3 in the area of the elongated hole 15, so that the sliding disk 14a lies flat there, for any position of the screw 14 within the elongated hole 15.

Das Langloch 15 zur Aufnahme der Schraube 14 liegt, wie insbesondere aus den Figuren 2 und 3 ersichtlich, im Bereich der Mitte der Klammer 3 zwischen dem Zylindersegment 13 im hinteren Bereich der Klammer 3 und der Vorderkante 17 der Klammer 3, die zum Spannen des Werkstücks 11 verwendet wird.The slot 15 for receiving the screw 14 is, in particular from the Figures 2 and 3 visible, in the area of the center of the clamp 3 between the cylinder segment 13 in the rear area of the clamp 3 and the front edge 17 of the clamp 3, which is used for clamping the workpiece 11.

Die Vorderkanten 17 der Klammern 3 verlaufen senkrecht zu den Längsachsen der Klammern 3 und damit parallel zur Längsachse der Auflagefläche 10 der Unterbacke 2. Wie insbesondere aus den Figuren 2 und 3 ersichtlich, ist die Vorderkante 17 jeder Klammer 3 abgerundet, wobei die jeweilige Vorderkante 17 einen kreissegmentförmigen Querschnitt aufweist.The front edges 17 of the brackets 3 are perpendicular to the longitudinal axes of the brackets 3 and thus parallel to the longitudinal axis of the bearing surface 10 of the lower jaw 2. As in particular from the Figures 2 and 3 As can be seen, the front edge 17 of each clip 3 is rounded, with the respective front edge 17 having a cross section in the shape of a segment of a circle.

Wie aus den Figuren 1 bis 3 ersichtlich, wird ein zu spannendes Werkstück 11 auf die Auflagefläche 10 der Unterbacke 2 aufgelegt und dann mit der Vorderkante 17 jeder Klammer 3 fixiert. Durch die Abrundung der Vorderkante 17 der Klammer 3 ist gewährleistet, dass keine flächige sondern eine exakt linienförmige Auflage der Vorderkante 17 der Klammer 3 auf dem Werkstück 11 erhalten wird und damit eine exakt in z-Richtung gegen die Auflagefläche 10 wirkende Spannkraft, was ein präzises Spannen des Werkstücks 11 ermöglicht. Die Präzision des Spannvorgangs wird durch die horizontale Auflagefläche 10 der Unterbacke 2 gefördert. Zum Spannen größerer Werkstücke 11 kann es sinnvoll sein, wenn die Auflagefläche 10 zum vorderen Rand der Unterbacke 2 hin um Bruchteile eines Grads ansteigt.How from the Figures 1 to 3 As can be seen, a workpiece 11 to be clamped is placed on the support surface 10 of the lower jaw 2 and then fixed with the front edge 17 of each clamp 3 . The rounding of the front edge 17 of the clip 3 ensures that no flat but an exact linear support of the front edge 17 of the clamp 3 on the workpiece 11 is obtained and thus a clamping force acting exactly in the z-direction against the supporting surface 10, which enables precise clamping of the workpiece 11. The precision of the clamping process is promoted by the horizontal contact surface 10 of the lower jaw 2. For clamping larger workpieces 11, it can be useful if the bearing surface 10 rises by fractions of a degree towards the front edge of the lower jaw 2.

Wie aus den Figuren 1 bis 3 ersichtlich ist die Kontur jeder Klammer 3 an die Kontur der Unterbacke 2, insbesondere an die Kontur der Oberseite der Unterbacke 2 angepasst. Insbesondere ist das Vorderteil einer Klammer 3 an die darunterliegende Schrägfläche 8 der Unterbacke 2 dadurch angepasst, dass das Vorderteil von zwei in spitzem Winkel aufeinander zulaufenden ebenen Flächen 18, 19 begrenzt ist.How from the Figures 1 to 3 the contour of each clip 3 can be seen to match the contour of the lower jaw 2 , in particular to the contour of the upper side of the lower jaw 2 . In particular, the front part of a clip 3 is adapted to the underlying inclined surface 8 of the lower jaw 2 in that the front part is delimited by two flat surfaces 18, 19 converging at an acute angle.

Schließlich weist jede Klammer 3 einen Anschlag 20 zur Begrenzung der Aufspannweite der Klammer 3 auf. Dieser Anschlag 20 ist an der Unterseite des hinteren Randbereichs der Klammer 3, der über das Zylindersegment 13 hervorsteht, vorgesehen.Finally, each clamp 3 has a stop 20 to limit the opening width of the clamp 3 . This stop 20 is provided on the underside of the rear edge area of the clip 3, which protrudes beyond the cylinder segment 13.

Wie aus den Figuren 1 bis 3 und insbesondere aus den Figuren 4a bis 4c ersichtlich, ist die Unterbacke 2 durch einen Schlitz 32 in ein oberes Segment 2a und ein unteres Segment 2b unterteilt.How from the Figures 1 to 3 and in particular from the Figures 4a to 4c As can be seen, the lower jaw 2 is divided by a slot 32 into an upper segment 2a and a lower segment 2b.

Der Schlitz 32 erstreckt sich über die gesamte Breite der Unterbacke 2 und mündet an deren gegenüberliegenden Seitenwänden aus.The slot 32 extends over the entire width of the lower jaw 2 and opens out at the opposite side walls.

Der Schlitz 32 verläuft im Wesentlichen in einer horizontalen Ebene und verläuft bis in den hinteren Bereich der Unterbacke 2 im Bereich der Ausnehmung 12. Dort endet der Schlitz 32 in einer Spirale 32a. Der Schlitz 32 erstreckt sich in den vorderen Bereich der Unterbacke 2 bis zum vorderen Rand der Anlegfläche 4. Dort weist der Schlitz 32 ein wellenförmiges Endsegment 32b auf.The slot 32 runs essentially in a horizontal plane and runs into the rear area of the lower jaw 2 in the area of the recess 12. There the slot 32 ends in a spiral 32a. The slot 32 extends into the front area of the lower jaw 2 up to the front edge of the contact surface 4. There the slot 32 has a wave-shaped end segment 32b.

Mit dem Schlitz 32 wird das untere Segment 2b der Unterbacke 2, das zur Befestigung auf der Unterlage vorgesehen ist, von dem oberen Segment 2a, an welches die Vorderkante der Unterbacke 2 mit der Auflagefläche 10 anschließt, entkoppelt.With the slot 32, the lower segment 2b of the lower jaw 2, which is intended for attachment to the base, is decoupled from the upper segment 2a, to which the front edge of the lower jaw 2 adjoins the bearing surface 10.

Wie insbesondere Figur 4b zeigt, ist in der Unterbacke 2 eine langlochförmige Aufnahme 33 vorgesehen, die zur Aufnahme einer nicht dargestellten Befestigungsschraube dient, mit der die Unterbacke 2 an der Unterlage befestigt wird.How in particular Figure 4b shows, in the lower jaw 2 a slot-shaped receptacle 33 is provided, which serves to receive a fastening screw, not shown, with which the lower jaw 2 is fastened to the base.

Die langlochförmige Aufnahme 33 besteht aus einem ersten Langlochsegment 33a im oberen Segment 2a und einem zweiten Langlochsegment 33b im unteren Segment 2b der Unterbacke 2, wobei der Querschnitt des ersten Langlochsegments 33a im oberen Segment 2a größer ist als der Querschnitt des zweiten Langlochsegments 33b im unteren Segment 2b. Die Befestigungsschraube ist damit mit Spiel im ersten Langlochsegment 33a des oberen Segments 2a geführt und durch Eingriff in die von den das zweite Langlochsegment 33b begrenzenden Rändern des unteren Segments 2b gebildeten Schraubflächen fixiert. Damit erfolgt die Befestigung der Unterbacke 2 an der Unterlage allein über das untere Segment 2b, nicht über das obere Segment 2a.The slot-shaped receptacle 33 consists of a first slot segment 33a in the upper segment 2a and a second slot segment 33b in the lower segment 2b of the lower jaw 2, the cross section of the first slot segment 33a in the upper segment 2a being larger than the cross section of the second slot segment 33b in the lower segment 2 B. The fastening screw is thus guided with play in the first elongated hole segment 33a of the upper segment 2a and fixed by engaging in the screw surfaces formed by the edges of the second elongated hole segment 33b of the lower segment 2b. Thus, the lower jaw 2 is attached to the base solely via the lower segment 2b, not via the upper segment 2a.

Wie insbesondere aus Figur 4b ersichtlich, sind symmetrisch zu der Symmetrieachse der Unterbacke 2 zwei identisch ausgebildete Gewindebohrungen 34 im oberen Segment 2a vorgesehen. Die Gewindebohrungen 34 weisen jeweils Innengewinde in Form von Feingewinden auf.Like in particular Figure 4b As can be seen, two identically designed threaded bores 34 are provided in the upper segment 2a symmetrically to the axis of symmetry of the lower jaw 2. The threaded bores 34 each have internal threads in the form of fine threads.

In den Gewindebohrungen 34 sind Justagemittel bildende Justierschrauben 35 geführt, wobei auch die Justierschrauben 35 identisch ausgebildet sind. Jede Justierschraube 35 weist an ihrem unteren Ende ein zapfenförmiges Endstück 35a auf.Adjusting screws 35 forming adjusting means are guided in the threaded bores 34, the adjusting screws 35 also being of identical design. Each adjusting screw 35 has a pin-shaped end piece 35a at its lower end.

Ist eine Justierschraube 35 vollständig in die Gewindebohrung 34 eingeschraubt, steht das zapfenförmige Endstück 35a über das untere Ende der Gewindebohrung 34 hervor und drückt gegen das untere Segment 2b. Um ein Festfräsen der Justierschrauben 35 zu verhindern, kann diese, insbesondere das zapfenförmige Endstück 35a eingefettet sein.If an adjusting screw 35 is fully screwed into the threaded bore 34, the pin-shaped end piece 35a is above the lower end of the Threaded hole 34 and presses against the lower segment 2b. In order to prevent the adjustment screws 35 from being milled tight, these, in particular the peg-shaped end piece 35a, can be greased.

Durch betätigen der Justierschrauben 35 kann das obere Segment 2a mit der Auflagefläche 10 in zwei Raumrichtungen lateral feinjustiert werden.By actuating the adjusting screws 35, the upper segment 2a with the bearing surface 10 can be finely adjusted laterally in two spatial directions.

Mit der Spannvorrichtung 1 gemäß den Figuren 1 bis 4 können Werkstücke 11 innerhalb eines großen Spannbereichs gespannt werden, das heißt es können Werkstücke 11 unterschiedlicher Höhen gespannt werden. Zum Spannen der Werkstücke 11 werden diese auf die Auflagefläche 10 aufgelegt, dann werden durch Betätigen der Schrauben 14 die Klammern 3 nach unten gegen die Unterbacke 2 geschwenkt und dadurch die Vorderkanten 17 der Klammern 3 gegen die Oberseite des Werkstücks 11 geführt.With the clamping device 1 according to the Figures 1 to 4 Workpieces 11 can be clamped within a large clamping range, that is, workpieces 11 of different heights can be clamped. To clamp the workpieces 11, they are placed on the support surface 10, then the clamps 3 are pivoted downwards against the lower jaw 2 by actuating the screws 14 and the front edges 17 of the clamps 3 are thereby guided against the upper side of the workpiece 11.

Die Spannvorrichtung 1 eignet sich insbesondere zum Einsatz in Drahterodiermaschinen. Wie aus Figur 4 ersichtlich können die für die Funkenerosion benötigten Komponenten, nämlich ein oder mehrere Drähte 21 sowie Düsen 22, 23 für ein flüssiges Dielektrikum, sehr dicht an die Spannvorrichtung 1 herangeführt werden, so dass auch eine Bearbeitung sehr flacher, kleiner Werkstücke 11 möglich ist.The clamping device 1 is particularly suitable for use in wire EDM machines. How out figure 4 As can be seen, the components required for spark erosion, namely one or more wires 21 and nozzles 22, 23 for a liquid dielectric, can be brought very close to the clamping device 1, so that very flat, small workpieces 11 can also be machined.

Durch die flache Konstruktion der Klammern 3, insbesondere deren Vorderteile, können obere Düsen 22 unmittelbar in dem Bereich der Vorderteile der Klammern 3 angeordnet werden. Entsprechend können untere Düsen 23 direkt unterhalb des vorderen Endes der Unterbacke 2 angeordnet werden, wobei die Abschrägung 6 am vorderen Ende der Unterbacke 2 ein sehr dichtes Heranführen der Düsen 23 an die Unterbacke 2 ermöglicht.Due to the flat construction of the clamps 3, in particular their front parts, upper nozzles 22 can be arranged directly in the area of the front parts of the clamps 3. Correspondingly, lower nozzles 23 can be arranged directly below the front end of the lower jaw 2 , with the bevel 6 at the front end of the lower jaw 2 enabling the nozzles 23 to be brought very close to the lower jaw 2 .

Figur 5 zeigt die Spannvorrichtung 1 gemäß den Figuren 1 bis 4 bei entferntem Werkstück 11. Dabei ist die hintere Klammer 3 noch von der Unterbacke 2 abgehoben, während die vordere Klammer 3 durch Anziehen der Schraube 14 gegen die Unterbacke 2 gedrückt ist, so dass die Unterseite der Klammer 3 mit Ausnahme der Vorderkante 17 dicht auf der Oberseite der Unterbacke 2 anliegt. figure 5 shows the clamping device 1 according to the Figures 1 to 4 with the workpiece 11 removed. The rear clamp 3 is still lifted off the lower jaw 2, while the front clamp 3 can be tightened by tightening the screw 14 is pressed against the lower jaw 2, so that the underside of the clip 3, with the exception of the front edge 17, rests tightly on the upper side of the lower jaw 2.

Der Bereich der Vorderkante 17 der auf der Unterbacke 2 aufliegenden Klammer 3 ist in Figur 6 in einer Detaildarstellung vergrößert dargestellt. Wie aus Figur 6 ersichtlich, schließt an den Absatz 9 der Unterbacke 2 das in einer horizontalen Ebene orientierte, schmale Flächensegment 9a an, das dann in die Schrägfläche 8 übergeht. Wie aus Figur 6 weiter ersichtlich, liegt der an die abgerundete Vorderkante 17 anschließende Randbereich der Klammer 3 auf dem Flächensegment 9a und der Schrägfläche 8 auf, während die Vorderkante 17 über den Absatz 9 hervorsteht und in geringem Abstand zur Auflagefläche 10 liegt. Damit wird vermieden, dass bei Aufsetzen der Klammer 3 auf die Oberseite der Unterbacke 2 die Vorderkante 17 gegen die Auflagefläche 10 gepresst wird, so dass Beschädigungen oder Beeinträchtigungen dieser Komponenten vermieden werden.The area of the front edge 17 of the clamp 3 resting on the lower jaw 2 is in figure 6 shown enlarged in a detail view. How out figure 6 As can be seen, the shoulder 9 of the lower jaw 2 is adjoined by the narrow surface segment 9a, which is oriented in a horizontal plane and then merges into the inclined surface 8. How out figure 6 It can also be seen that the edge area of the clip 3 adjoining the rounded front edge 17 rests on the surface segment 9a and the inclined surface 8, while the front edge 17 protrudes over the shoulder 9 and is at a small distance from the support surface 10. This avoids the front edge 17 being pressed against the support surface 10 when the clamp 3 is placed on the upper side of the lower jaw 2, so that damage to or impairment of these components is avoided.

Wie aus Figur 6 ersichtlich, ist die Grenze zwischen Absatz 9 und Auflagefläche 10 nicht als eine exakte Kante ausgebildet. Vielmehr ist dort ein Freischnitt 24 vorgesehen. Dadurch wird erreicht, dass Werkstücke 11, die ihrerseits exakt linienförmige Kanten aufweisen, dicht und spielfrei an den Absatz 9 und die Auflagefläche 10 angelegt werden können, so dass ein exaktes Positionieren des Werkstücks 11 möglich ist.How out figure 6 seen, the boundary between paragraph 9 and support surface 10 is not formed as an exact edge. Rather, a free cut 24 is provided there. This ensures that workpieces 11, which in turn have exactly linear edges, can be placed tightly and without play on shoulder 9 and support surface 10, so that exact positioning of workpiece 11 is possible.

Die Figuren 7 und 8 zeigen eine Erweiterung der Spannvorrichtung 1 der Figuren 1 bis 6. Die Spannvorrichtung 1 der Figuren 7 und 8 weist als zusätzliches Modul einen Adapter 25 auf, der zwischen der Unterbacke 2 und den Klammern 3 angeordnet ist.The figures 7 and 8th show an extension of the clamping device 1 of Figures 1 to 6 . The clamping device 1 of figures 7 and 8th has an adapter 25 as an additional module, which is arranged between the lower jaw 2 and the clamps 3 .

Der Adapter 25, der in Figur 9 in einer Einzeldarstellung dargestellt ist, ist als Massivteil ausgebildet, das an seiner Unterseite ein Zylindersegment 26 aufweist, dass hinsichtlich seiner Kontur dem Zylindersegment 13 der Klammern 3 entspricht. An der Oberseite des Adapters 25 ist eine Ausnehmung 27 vorgesehen, die der Ausnehmung 12 der Unterbacke 2 entspricht. Weiterhin weist der Adapter 25 an seiner Oberseite ausmündende Gewindebohrungen 28 auf, welche den Gewindebohrungen 16 der Unterbacke 2 entsprechen. Schließlich weist der Adapter 25 eine Aussparung 29 auf, die an dessen Frontseite 30 ausmündet und sich über die gesamte Breite des Adapters 25 abschließt. In die Aussparung 29 ist ein Magnet 31 eingesetzt. Der Magnet 31 schließt bündig mit der Frontseite 30 ab und bildet mit dieser eine ebene Fläche.The adapter 25, which is in figure 9 is shown in an individual representation is designed as a solid part, which has a cylinder segment 26 on its underside that corresponds to the cylinder segment 13 of the clamps 3 in terms of its contour. At the top of the adapter 25 is a recess 27 provided, which corresponds to the recess 12 of the lower jaw 2. Furthermore, the adapter 25 has threaded holes 28 opening out on its upper side, which correspond to the threaded holes 16 of the lower jaw 2 . Finally, the adapter 25 has a recess 29 which opens out on its front side 30 and closes over the entire width of the adapter 25 . A magnet 31 is inserted into the recess 29 . The magnet 31 is flush with the front side 30 and forms a flat surface with it.

Die Konfiguration der Spannvorrichtung 1 von Figur 1 kann in die Konfiguration der Figuren 7 und 8 einfach dadurch umgewandelt werden, dass die Klammern 3 von der Unterbacke 2 abgenommen werden und dann der Adapter 25 auf der Unterbacke 2 befestigt wird, indem das Zylindersegment 26 des Adapters 25 in die Ausnehmung 12 der Unterbacke 2 eingeführt wird. Anschließend werden die Zylindersegmente 13 der Klammern 3 in die Ausnehmung 27 des Adapters 25 eingeführt. Prinzipiell kann dies wiederum durch seitliches Einschieben der Zylindersegmente 13 der Klammern 3 in die Ausnehmung 27 des Adapters 25 erfolgen. Bei der Ausführungsform der Figuren 7 und 8 sind die Konturen der Zylindersegmente 13 der Klammern 3 gegenüber der Ausführungsform der Figuren 1 bis 6 dahin abgeändert, dass die Zylindersegmente 13 von oben in die Ausnehmung 27 eingeführt werden können und dann durch Drehen in ihre Arbeitspositionen dort lagefixiert werden.The configuration of the jig 1 of figure 1 can in the configuration of figures 7 and 8th can be converted simply by removing the clips 3 from the lower jaw 2 and then attaching the adapter 25 to the lower jaw 2 by inserting the cylinder segment 26 of the adapter 25 into the recess 12 of the lower jaw 2. Then the cylinder segments 13 of the clamps 3 are inserted into the recess 27 of the adapter 25 . In principle, this can in turn be done by laterally pushing in the cylinder segments 13 of the clamps 3 into the recess 27 of the adapter 25 . In the embodiment of figures 7 and 8th the contours of the cylinder segments 13 of the clamps 3 are modified compared to the embodiment of FIGS. 1 to 6 in such a way that the cylinder segments 13 can be inserted into the recess 27 from above and are then fixed in position there by turning into their working positions.

Die Klammern 3 sind dann schwenkbar am Adapter 25 gelagert, wobei die Spannvorgänge wieder durch Betätigen der Schrauben 14 erfolgt, wobei diese nun in die Gewindebohrungen 28 des Adapters 25 greifen.The clamps 3 are then mounted pivotably on the adapter 25, with the clamping processes again taking place by actuating the screws 14, which now engage in the threaded bores 28 of the adapter 25.

Wie aus dem Vergleich der Figuren 7 und 1 deutlich ersichtlich ist, wird durch den Adapter 25 der Abstand zwischen den Klammern 3 und der Unterbacke 2 erhöht, so dass nun Werkstücke 11 mit deutlich größeren Bauhöhen gespannt werden können.As from the comparison of figures 7 and 1 is clearly visible, the distance between the clamps 3 and the lower jaw 2 is increased by the adapter 25, so that workpieces 11 with significantly greater overall heights can now be clamped.

Wie aus Figur 8 ersichtlich, schließt bei auf der Unterbacke 2 befestigtem Adapter 25 dessen Frontseite 30 bündig mit dem Absatz 9 der Unterbacke 2 ab. Damit bildet die Frontseite 30 eine Anschlagfläche für das Werkstück, dessen ebene Vorderseite bei Anlegen an die Frontseite 30 bereits korrekt am Anschlag 9 anliegt. Durch den Magneten 31 an der Frontseite 30 des Adapters 25 wird das Werkstück 11 sicher in dieser Sollposition gehalten, so dass dann der Spannvorgang mit den Klammern 3 durchgeführt werden kann.How out figure 8 As can be seen, when the adapter 25 is fastened to the lower jaw 2, its front side 30 is flush with the paragraph 9 of the lower jaw 2. The front side 30 thus forms a stop surface for the workpiece, the flat front side of which already lies correctly against the stop 9 when it is placed against the front side 30 . The workpiece 11 is held securely in this desired position by the magnet 31 on the front side 30 of the adapter 25, so that the clamping process with the clamps 3 can then be carried out.

BezugszeichenlisteReference List

(1)(1)
Spannvorrichtungclamping device
(2)(2)
Unterbackelower cheek
(2a)(2a)
Oberes Segmentupper segment
(2b)(2 B)
Unteres Segmentlower segment
(3)(3)
Klammerbracket
(4)(4)
Anlegflächeberth
(5)(5)
FlächeArea
(6)(6)
Abschrägungbevel
(7)(7)
Grenzflächeinterface
(8)(8th)
Schrägflächebevel
(9)(9)
AbsatzParagraph
(9a)(9a)
Flächensegmentsurface segment
(10)(10)
Auflageflächebearing surface
(11)(11)
Werkstückworkpiece
(12)(12)
Ausnehmungrecess
(13)(13)
Zylindersegmentcylinder segment
(14)(14)
Schraubescrew
(14a)(14a)
Gleitscheibesliding disc
(15)(15)
LanglochLong hole
(16)(16)
Gewindebohrungthreaded hole
(16a)(16a)
Langlochsegmentslot segment
(16b)(16b)
Langlochsegmentslot segment
(17)(17)
Vorderkanteleading edge
(18)(18)
FlächeArea
(19)(19)
FlächeArea
(20)(20)
Anschlagattack
(21)(21)
Drahtwire
(22)(22)
Düsejet
(23)(23)
Düsejet
(24)(24)
Freischnittfree cut
(25)(25)
Adapteradapter
(26)(26)
Zylindersegmentcylinder segment
(27)(27)
Ausnehmungrecess
(28)(28)
Gewindebohrungthreaded hole
(29)(29)
Aussparungrecess
(30)(30)
Frontseitefront
(31)(31)
Magnetmagnet
(32)(32)
Schlitzslot
(32a)(32a)
Spiralespiral
(32b)(32b)
Wellenförmiges EndsegmentWavy end segment
(33)(33)
Langlochförmige AufnahmeSlotted mount
(33a)(33a)
Erstes LanglochsegmentFirst slot segment
(33b)(33b)
Zweites LanglochsegmentSecond slot segment
(34)(34)
Gewindebohrungthreaded hole
(35)(35)
Justierschraubeadjustment screw
(35a)(35a)
Zapfenförmiges EndstückCone-shaped end piece

Claims (14)

  1. Clamping device (1) with a lower jaw (2), at the front edge of which a support surface (10), which extends at least approximately in a horizontal plane, for a workpiece (11) to be clamped is provided, and with at least one clamp (3) which is arranged above the lower jaw (2) and which in the region of its back end is pivotably mounted on the upper side of the lower jaw (2) so that through actuation of a clamping means the clamp (3) is led against the upper side of the lower jaw (2), whereby the front edge (17) of the clamp (3) is pressed against the upper side of the workpiece (11) lying on the support surface (10), characterised in that a slit (32) separating an upper segment (2a) from a lower segment (2b) extends in the lower jaw (2), wherein the lower side of the lower segment (2b) forms a rest surface (4) for support on a substrate and at the upper segment (2a) the front edge is provided with the support surface (10), and wherein adjusting means for adjusting the front edge (17) are provided in the upper segment (2a).
  2. Clamping device (1) according to claim 1, characterised in that the slit (32) extends substantially in a horizontal plane.
  3. Clamping device (1) according to one of claims 1 and 2, characterised in that the slit (32) has a spiral end segment in a rear region, which faces away from the front edge (17), of the lower jaw (2).
  4. Clamping device (1) according to any one of claims 1 to 3, characterised in that the slit (32) has in a front region facing the front edge (17) an end segment opening at the front edge of the rest surface (4).
  5. Clamping device (1) according to claim 4, characterised in that the cross-sectional line of the end segment is wave-shaped.
  6. Clamping device (1) according to any one of claims 1 to 5, characterised in that the adjusting means are formed by adjusting screws (35) which are guided in threaded bores (34), which form receptacles, in the upper segment.
  7. Clamping device (1) according to claim 6, characterised in that each adjusting screw (35) has in the lower end thereof a pin-shaped end member (35a), wherein when the adjusting screw (35) is mounted in the threaded bore (34) the pin-shaped end member (35a) protrudes beyond the lower open edge of the threaded bore (34) and presses against the upper segment (2a).
  8. Clamping device (1) according to any one of claims 1 to 7, characterised in that two adjusting means are provided.
  9. Clamping device (1) according to claim 8, characterised in that the receptacles for the adjusting means are symmetrical with respect to a plane of symmetry extending through the longitudinal axis of the lower jaw (2).
  10. Clamping device (1) according to any one of claims 1 to 9, characterised in that the adjusting means and the associated receptacles are respectively of identical construction.
  11. Clamping device (1) according to any one of claims 1 to 10, characterised in that the lower jaw (2) has a slot-shaped receptacle (33) for reception of a fastening screw by means of which the lower jaw (2) is fixable to the substrate.
  12. Clamping device (1) according to claim 11, characterised in that the slot-shaped receptacle (33) consists of a slot segment (16a), in which a fastening screw is guided with play, in the upper segment (2a) and a slot segment (16b) in the lower segment (2b), wherein the edges, which bound the slot segment (16b), of the lower segment (2b) form screw surfaces for mounting of the fasting screws.
  13. Clamping device (1) according to any one of claims 1 to 12, characterised in that the clamping means is formed by a screw (14), which penetrates a slot (15) in the clamp (3) and the front end of which is mounted in a threaded bore (16) of the lower jaw (2) so that through actuation of the head, which is exposed at the upper side of the clamp (3), of the screw (14) the clamp (3) can be led against the lower jaw (2).
  14. Clamping device (1) according to any one of claims 1 to 13, characterised in that the lower jaw (2) has at its upper side an inclined surface (8), which adjoins the support surface (10), as well as a boundary surface (7), which adjoins the inclined surface (8) and extends in a horizontal plane, and that for formation of a pivot mount for at least one clamp (3) the lower jaw (2) has a cylindrical recess (12), which extends parallel to the front edge (17) of the lower jaw and opens at the boundary surface (7) of the lower jaw (2) and which forms a receptacle for a cylinder segment (13) of at least one clamp (3).
EP22171353.0A 2021-05-10 2022-05-03 Clamping device Active EP4088864B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102021112157.4A DE102021112157B3 (en) 2021-05-10 2021-05-10 clamping device

Publications (2)

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EP4088864A1 EP4088864A1 (en) 2022-11-16
EP4088864B1 true EP4088864B1 (en) 2023-08-30

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP22171353.0A Active EP4088864B1 (en) 2021-05-10 2022-05-03 Clamping device

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Country Link
EP (1) EP4088864B1 (en)
DE (1) DE102021112157B3 (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009011612B3 (en) 2009-03-04 2010-10-28 F.J. Pfeffer Formenbau Gmbh jig
AU2009201283B1 (en) * 2009-04-02 2010-09-09 Brownbill, Danielle Tiffany A Clamp for a Panel
CN107263348B (en) * 2016-04-06 2019-01-25 哈尔滨飞机工业集团有限责任公司 A kind of two-way positioning clamping device of machining
DE102016114428B3 (en) 2016-08-04 2017-08-10 M. Jürgensen GmbH & Co. KG Clamping jaw and chuck with a plurality of jaws

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