EP0268176A1 - Electromotive clamping device for work pieces - Google Patents

Electromotive clamping device for work pieces Download PDF

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Publication number
EP0268176A1
EP0268176A1 EP87116504A EP87116504A EP0268176A1 EP 0268176 A1 EP0268176 A1 EP 0268176A1 EP 87116504 A EP87116504 A EP 87116504A EP 87116504 A EP87116504 A EP 87116504A EP 0268176 A1 EP0268176 A1 EP 0268176A1
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EP
European Patent Office
Prior art keywords
axial
coupling
spindle
threaded spindle
holder
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.)
Granted
Application number
EP87116504A
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German (de)
French (fr)
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EP0268176B1 (en
Inventor
Reinhard Hafeneger
Peter Walther
Michel Buchenau
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DESTACO Europe GmbH
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DE STA CO Metallerzeugnisse GmbH
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Priority to AT87116504T priority Critical patent/ATE64707T1/en
Publication of EP0268176A1 publication Critical patent/EP0268176A1/en
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Publication of EP0268176B1 publication Critical patent/EP0268176B1/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
    • B25B5/12—Arrangements for positively actuating jaws using toggle links

Definitions

  • the invention relates to an electric motor-driven workpiece clamping device according to the preamble of the main claim.
  • Such clamping devices are known according to K. Schreyer, workpiece clamps (devices, 3rd edition, Springer-Verlag, Berlin, Heidelberg, New York 1969, pp. 80, 81; Fig. 246) and in particular for use on lathes for actuating mandrels, determined pliers and chucks, these devices can also be equipped with a spring to allow elastic tensioning.
  • Such an electromotive driven clamping device is not readily suitable for clamping devices of the type of interest here, since elastic clamping is not an option for workpiece clamping devices and such a known clamping device led to wedging of the threaded spindle with the actuator without a spring.
  • Clamping devices of the type of interest here are known, for example, from DE-PS 30 22 376, but also from the following publications: DE-PS 19 50 721, 12 68 074, DE-OS 22 22 686, FR-PS 12 55 515 and finally according to US Pat. No. 31 16 058.
  • Pneumatic or hydraulic drives are provided in all of these known clamping devices, the translatory lifting movement of which is articulated by actuators mounted in the device in the pivoting movement of the clamping lever is implemented.
  • this rotary drive provided for hooks, brackets or the like.
  • Load carrier is also not readily suitable for tensioning devices of the type of interest here, since the elastic buffer, which is intended to prevent wedging of the threads involved is located at the free end of the threaded spindle and can only take effect if the non-adjustable stop inside the actuator sits on this buffer. The same applies to the fully extended position of the actuator.
  • the invention is therefore based on the object to improve a device of the type mentioned in such a way that a wedging in each clamping position, i.e. should be preventable in the bottom, dead center and also over dead center clamping position.
  • the threaded spindle can move to a limited extent due to the "floating" bearing. Since this floating bearing with its axial suspension is arranged on the coupling or drive side according to the invention, the axial suspension preventing thread wedging can come into effect in any clamping position.
  • the axial suspension must of course be designed so that a driving force of the motor is required for a predetermined compression, in which the power consumption of the motor is switched off, in which the maximum clamping force is also generated via the clamping device and in which no self-wedging of the thread has yet taken place . Under this condition, the following occurs on the clamping device according to the invention: The clamping lever is first brought into contact with the workpiece without the axial springing back.
  • the motor Since the motor then still has power reserves, it rotates the spindle further, but with increasing clamping force it dodges axially towards the drive side and compresses the axial suspension until the maximum clamping force is reached, that is, the tensioning force now corresponds to the tensioning force of the compressed suspension and without the threading becoming wedged, which would occur if the spindle could not deflect axially in the opposite direction. Since the motor is designed for a certain current consumption or can be switched off, it is essential for the return of the spindle and the release of the clamping device from its clamping position that the threads have not wedged, which required a correspondingly greater restoring force for the release of the wedging. which the engine is unable to perform.
  • the same principle of axial cushioning can advantageously also be used for this position, so that the tensioning device is also in this position to prevent wedging of the threads.
  • Such an axial suspension can either be arranged between the free end of the spindle and inside the actuator, but preferably and advantageously between the coupling-side end of the actuator and a corresponding support in the device holder, because an arrangement on the free spindle end would require readjustment if the actuator would change in length.
  • the motor is preferably and advantageously arranged coaxially to the threaded spindle on the holder.
  • the tensioning device consists of a tensioning lever 14 which is pivotally mounted in a holder H and which is connected in an articulated manner via an intermediate member 13 to an actuator 7 axially guided in the holder H and axially movable by a drive.
  • This known construction principle of such devices is thus retained in the present device, but the previously conventional pneumatic or hydraulic linear drive is replaced by a reversible rotary drive in its direction of rotation, namely in the form of a reversible motor 1 arranged coaxially with the spindle 3 with an upstream one Planetary gear 1 ⁇ and an axial clutch 2, which, as shown in Fig.
  • the actuator is formed from two parts, namely from the actuator head piece 7 ⁇ and a correspondingly internally threaded spindle sleeve 7 ⁇ , onto which the actuator head piece 7 ⁇ is screwed and fixed in the desired position by means of a lock nut 8.
  • the intermediate member 13 is articulated, which in turn with a Ge Steering extension 14 ⁇ of the clamping lever 14 is articulated in connection, which is in Fig. 1 in the open position and in Fig. 2 in the closed and clamping position.
  • the holder H of the device in which the entire adjustment mechanism is mounted, consists of several parts, all of which are designated by 5.
  • the actuator head piece 7 ⁇ in the exemplary embodiment shown is provided with a thickening 15, specifically for receiving the one joint of the intermediate member 13 and for receiving small guide rollers 16 which are supported on a flat guide 17 of the holder H.
  • This type of design of the actuator head piece is also known.
  • other types of guidance of the actuator head piece 7 ⁇ can also be used.
  • the illustrated embodiment of the actuator 7 ⁇ is advantageously used.
  • the trapezoidal threaded spindle 3 is mounted in the small coupling 2 with its drive-side end 3 fest rotatably but axially displaceably.
  • the trapezoidal threaded spindle 3 is provided with two radial ball bearings 10, which are fixed on the spindle 3 with two lock nuts 12.
  • the two radial ball bearings 10 are in turn mounted in an axial sliding bush 11, which is slightly in one corresponding slide bearing guide 11 ⁇ of the holder H can move and is secured against rotation with a suitable element 18.
  • the reversing motor 1 (electric gear motor) is designed for a specific current consumption and switches off in the event of an overload, which occurs when the axial suspension 19 is compressed to a predetermined load value.
  • the tensioning lever 14 is to be released from its tensioning position, which can also be an over-dead center tensioning position, the motor 1, correspondingly switched over, rotates to the other side, with the existing self-locking of the threads being overcome without problems since there is no wedging between the threads .
  • the floating bearing is provided on the dome side with the axial suspension 19 in the form of a plate spring which is braced against the stop 20 ⁇ in the holder H. This stop can optionally also be made adjustable.
  • the axial suspension 19 is, as mentioned, designed so that in the fully or partially compressed state of the maximum tension force that can be applied to the tensioning lever 14, which ensures that no further forces are introduced into the device when the tensioning position is reached, which would otherwise lead to wedging the thread would lead.
  • a limit switch 21 could of course be provided at a suitable point, which switches off the reversing motor 1 in good time. It is also advantageous, however, as can be seen from FIG. 3, to arrange a corresponding axial suspension 19 ⁇ on the tension side in front of the floating bearing, which makes such a limit switch unnecessary.
  • This axial suspension 19 ⁇ is therefore in a suitable manner between the first radial ball bearing 10 and the stop 4 ⁇ Holder H arranged, whereby the axial suspension 19 ⁇ arranged there, just like the axial suspension 19, comes into effect completely independently of the actually set length of the actuator 7.
  • the axial suspension 19 ⁇ could indeed be applied directly to the stop 4 ⁇ , but advantageously the stop can also be made axially adjustable in a suitable manner for its adjustability, which is not particularly shown.
  • the actuator head piece 7 ⁇ or the part of the actuator 7 ⁇ forming the spindle sleeve 7 ⁇ is provided with an end stop 6 in the form of an annular collar which interacts with the abovementioned stop 4.
  • the stop 4 forms a part with an exchangeable guide bush 9 which comprises the spindle 13 and the actuator 7 and which, as illustrated for example, is suitably integrated in the holder H.
  • This stop 4 now serves to prevent the spindle 3 from being completely unscrewed from the actuator 7 if the clamping lever 14 does not come to the clamping system for some reason on a workpiece, because then the motor 1 would not be loaded, simply continue to rotate and depending on Unscrew the spindle 3 from the actuator 7 according to the structural dimensions. Even if the end stop 6 of the spindle sleeve 7 'comes to rest against the stop 4, there is no thread wedging, since the "floating" bearing 20 then comes into operation again.
  • This described embodiment ensures that the threaded spindle 3 cannot wedge with the actuator 7. If, however, there are unfavorable circumstances, e.g. expansion of the clamped workpiece due to the effects of heat or high stress on the clamping arm when swiveling back due to additional loads on the tension arm (e.g. shape-matched pressure pieces that have to be fastened to the tension arm), it can happen that the nominal current consumption of the motor 1 is not sufficient to move the tension arm or its actuator 7 out of its more heavily loaded end position.
  • the circuit of the reversing motor 1 contains two measuring circuits IC1 and IC2 which are relatively matched with respect to the current consumption of the motor in such a way that the reversing motor 1 receives a higher power supply than it when moving from the two end positions corresponds to the nominal current when moving into the end positions.
  • the two measuring circuits are preferably adjusted in a ratio of 1: 1.5. This circuit is illustrated in Fig.4.
  • This circuit assigned to the motor circuit works as follows: The start signal that sets the 1st and 2nd input S in the IC3 is given via the button S 1. At the same time, the 4th input R in IC3 is reset. The free passage is switched in the "undister” of the IC4 and the motor 1 is switched to open via the optocouplers 3 and K1. At the same time the current is measured via the IC2. As soon as the drawn current exceeds the set value of R 11, the IC2 switches through and the 1st input R in the IC3 is reset, whereby the motor 1 is switched off. The same happens when the tensioner is closed using button S2 and IC1.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gripping On Spindles (AREA)
  • Jigs For Machine Tools (AREA)
  • Earth Drilling (AREA)
  • Massaging Devices (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

Abstract

The work-piece clamping device is provided with a clamping lever (14) which is pivotally mounted in a holder and is connected, in articulated manner, via an intermediate member (13) to an actuating member (7) which is secured against rotation and can be moved axially by a drive. The rotary drive consists, in this case, of a threaded spindle (3), rotatably mounted on the holder and driveable by a reversing motor (1), with a self-locking thread pitch which is in engagement with the moveable actuating member (7) provided with an internal thread, and of an axial spring (19) which becomes active in between actuating member and spindle when the clamping end position is reached and prevents wedging of the thread. The reversing motor (1) is connected to the threaded spindle (3) with interposition of an axial coupling (2). The threaded spindle (3) is mounted, on the coupling side, so as to be axially displaceable in a limited manner in a bearing (20) arranged axially displaceably in the holder (H) and provided with the axial spring (19). The coupling-side end of the threaded spindle (3) is arranged so as to be fixed in terms of rotation but axially displaceable in the axial coupling (2). Lastly, the axial spring (19) is arranged between the bearing (20) and a coupling-side support (20') on the holder (H). As a result of this design according to the invention, self-wedging of the thread is prevented, independently of the position in which the lever (14) assumes the actual clamping end position. <IMAGE>

Description

Die Erfindung betrifft eine elektromotorisch antreibbare Werkstückspannvorrichtung gemäß Oberbegriff des Hauptanspruches.The invention relates to an electric motor-driven workpiece clamping device according to the preamble of the main claim.

Derartige Spannvorrichtungen sind bekannt nach K. Schreyer, Werkstückspanner (Vorrichtungen, 3. Auflage, Springer-Verlag, Berlin, Heidelberg, New York 1969, S. 80, 81 ; Bild 246) und insbesondere für die Verwendung an Drehbänken zum Betätigen von Spanndornen, -zangen und -futtern bestimmt, wobei diese Vorrichtungen auch mit einer Feder ausgestattet werden können, um ein elastisches Spannen zu ermöglichen. Für Spannvorrichtungen der hier interessierenden Art ist eine derartige elektromotorisch angetriebene Spannvorrichtung nicht ohne weiteres geeignet, da für Werkstückspannvorrichtungen ein elastisches Festspannen nicht in Frage kommt und ohne Feder eine solche vorbekannte Spannvorrichtung zum Verkeilen der Gewindespindel mit dem Stellglied führte.Such clamping devices are known according to K. Schreyer, workpiece clamps (devices, 3rd edition, Springer-Verlag, Berlin, Heidelberg, New York 1969, pp. 80, 81; Fig. 246) and in particular for use on lathes for actuating mandrels, determined pliers and chucks, these devices can also be equipped with a spring to allow elastic tensioning. Such an electromotive driven clamping device is not readily suitable for clamping devices of the type of interest here, since elastic clamping is not an option for workpiece clamping devices and such a known clamping device led to wedging of the threaded spindle with the actuator without a spring.

Spannvorrichtungen der hier interessierenden Art sind bspw. nach der DE-PS 30 22 376 bekannt, aber auch nach den folgenden Druckschriften: DE-PS 19 50 721, 12 68 074, der DE-OS 22 22 686, der FR-PS 12 55 515 und schließlich nach der US-PS 31 16 058. Bei allen diesen bekannten Spannvorrichtungen sind pneumatische oder hydraulische Antriebe vorgesehen, deren translatorische Hubbewegung durch gelenkig in der Vorrichtung gelagerte Stellglieder in die Schwenkbewegung des Spannhebels umgesetzt wird. Bezüglich dieser Antriebsart für derartige Spannvorrichtungen hat es nicht an Versuchen gefehlt, solche Spannvorrichtungen mit Drehantrieben zu versehen, also insbesondere mit elektrischen Antrieben, deren Drehbewegung allerdings nicht ohne weiteres in eine translatorische und nachfolgende Schwenkbewegung der Stellglieder umgesetzt werden kann, da dies im Bereich des Halters für den Spannhebel und dessen Verstellmechanik zu einer größeren Raumbeanspruchung und damit entsprechender Baugröße derartiger Vorrichtungen führt, die in den meisten Anwendungsfällen nicht akzeptabel ist, weil in der Regel mehrere solcher Spannvorrichtungen in möglichst dichter Zuordnung am betreffenden Werkstück (bspw. Autokarrosserie) angesetzt werden müssen.Clamping devices of the type of interest here are known, for example, from DE-PS 30 22 376, but also from the following publications: DE-PS 19 50 721, 12 68 074, DE-OS 22 22 686, FR-PS 12 55 515 and finally according to US Pat. No. 31 16 058. Pneumatic or hydraulic drives are provided in all of these known clamping devices, the translatory lifting movement of which is articulated by actuators mounted in the device in the pivoting movement of the clamping lever is implemented. With regard to this type of drive for such tensioning devices, there has been no shortage of attempts to provide such tensioning devices with rotary drives, in particular with electric drives, the rotary movement of which, however, cannot readily be converted into a translatory and subsequent pivoting movement of the actuators, since this is in the area of the holder for the clamping lever and its adjustment mechanism leads to a larger space requirement and thus the corresponding size of such devices, which is not acceptable in most applications, because several such clamping devices usually have to be attached as closely as possible to the workpiece in question (e.g. car bodywork).

Nach der US-PS 41 37 784 ist ein weiterer elektromotorischer Drehantrieb um Umkehr-Motor bekannt.According to US-PS 41 37 784 another electromotive rotary drive for reversing motor is known.

Abgesehen davon, daß bei diesem elektromechanischen Drehantrieb der Antriebsmotor raumbeanspruchend achsparallel zum Spindelantrieb des Stellgliedes angeordnet ist, ist dieser für Haken, Bügel od. dgl. Lastenträger vorgesehene Drehantrieb für Spannvorrichtungen der hier interessierenden Art ebenfalls nicht ohne weiteres geeignet, da sich der elastische Puffer, der eine Verkeilung der beteiligten Gewinde verhindern soll am freien Ende der Gewindespindel befindet und nur dann wirksam werden kann, wenn sich der nicht einstellbare Anschlag im Innern des Stellgliedes auf diesen Puffer aufsetzt. Gleiches gilt für die voll ausgefahrene Stellung des Stellgliedes. Wenn sich also - vorausgesetzt dieser Drehantrieb wäre mit einer Spannvorrichtung gekoppelt - der Spannhebel an eine festzuspannende Werkstückoberfläche festgespannt angelegt hat und wäre dabei der Puffer der Spindel noch nicht am inneren antriebsseitigen Anschlag des Stellgliedes zur Anlage gekommen, so würden sich die Gewinde verkeilen, d.h., der vorbekannte Drehantrieb müßte konstruktiv exakt auf jede Spannstellung abgestellt werden. Eine Verände rung und damit Einstellbarkeit der Anschlagsverhältnisse wäre aber nur im Inneren des als Hülse ausgebildeten Stellgliedes möglich und damit kompliziert.Apart from the fact that in this electromechanical rotary drive the drive motor is arranged axially parallel to the spindle drive of the actuator to take up space, this rotary drive provided for hooks, brackets or the like. Load carrier is also not readily suitable for tensioning devices of the type of interest here, since the elastic buffer, which is intended to prevent wedging of the threads involved is located at the free end of the threaded spindle and can only take effect if the non-adjustable stop inside the actuator sits on this buffer. The same applies to the fully extended position of the actuator. So if - provided that this rotary drive were coupled with a clamping device - the clamping lever was firmly clamped to a workpiece surface to be clamped and the buffer of the spindle had not yet come into contact with the inner drive-side stop of the actuator, the threads would wedge, ie the previously known rotary drive would have to be structurally exactly adjusted to each clamping position. A change tion and thus adjustability of the stop conditions would only be possible inside the actuator designed as a sleeve and thus complicated.

Der Erfindung liegt demgemäß die Aufgabe zugrunde, eine Vorrichtung der eingangs genannten Art dahingehend zu verbessern, daß eine Gewindeverkeilung in jeder Spannstellung, d.h. in Unter-, Totpunkt- und auch Übertotpunkt-Spannstellung verhinderbar sein soll.The invention is therefore based on the object to improve a device of the type mentioned in such a way that a wedging in each clamping position, i.e. should be preventable in the bottom, dead center and also over dead center clamping position.

Diese Aufgabe ist mit einer Werkstückspannvorrichtung der ein gangs genannten Art nach der Erfindung durch die im Kennzeichen angeführten Merkmale gelöst. Vorteilhafte Weiterbildungen und praktische Ausführungsformen ergeben sich nach den Unteransprüchen.This object is achieved with a workpiece clamping device of the type mentioned at the outset according to the invention by the features stated in the characterizing part. Advantageous further developments and practical embodiments result from the subclaims.

Für diese erfindungsgemäße Ausbildung der Vorrichtung ist also wesentlich, daß sich die Gewindespindel durch die "schwimmende" Lagerung begrenzt bewegen kann. Da diese schwimmende Lagerung mit ihrer Axialfederung erfindungsgemäß kupplungs- bzw. antriebsseitig angeordnet ist, kann also die eine Gewindeverkeilung verhindernde Axialfederung in jeder Spannstellung zur Wirkung kommen. Die Axialfederung muß dabei natürlich so ausgelegt sein, daß für eine vorbestimmte Zusammendrückung eine Antriebskraft des Motors erforderlich ist, bei der die Stromaufnahme des Motors abgeschaltet, bei der ferner die maximale Klemmkraft via Spannvorrichtung erzeugt wird und bei der ferner noch keine Selbstverkeilung der Gewinde erfolgt ist. Unter dieser Voraussetzung geschieht an der erfindungsgemäßen Spannvorrichtung folgendes: Der Spannhebel wird ohne axiales Zurückweichen der Axialfederung zunächst am Werkstück zur Anlage gebracht. Da der Motor dann noch über Kraftreserven verfügt, dreht dieser die Spindel weiter, die jedoch mit zunehmender Spannkraft axial zur Antriebsseite hin und unter Zusammendrückung der Axialfederung ausweicht, bis die maximale Spannkraft erreicht ist, d.h., die Spannkraft entspricht jetzt der Spannkraft der zusammengedrückten Federung und zwar ohne daß es dabei zu einer Verkeilung der Gewinde gekommen ist, die eintreten würde, wenn die Spindel axial nicht in entgegengesetzter Richtung ausweichen könnte. Da der Motor für eine bestimmte Stromaufnahme ausgelegt bzw. abschaltbar ist, ist es für die Rückstellung der Spindel und die Lösung der Spannvorrichtung aus ihrer Spannstellung wesentlich, daß sich die Gewinde nicht verkeilt haben, was eine für die Lösung der Verkeilung entsprechend größere Rückstellkraft erforderte, die aber der Motor nicht zu leisten vermag.For this embodiment of the device according to the invention it is essential that the threaded spindle can move to a limited extent due to the "floating" bearing. Since this floating bearing with its axial suspension is arranged on the coupling or drive side according to the invention, the axial suspension preventing thread wedging can come into effect in any clamping position. The axial suspension must of course be designed so that a driving force of the motor is required for a predetermined compression, in which the power consumption of the motor is switched off, in which the maximum clamping force is also generated via the clamping device and in which no self-wedging of the thread has yet taken place . Under this condition, the following occurs on the clamping device according to the invention: The clamping lever is first brought into contact with the workpiece without the axial springing back. Since the motor then still has power reserves, it rotates the spindle further, but with increasing clamping force it dodges axially towards the drive side and compresses the axial suspension until the maximum clamping force is reached, that is, the tensioning force now corresponds to the tensioning force of the compressed suspension and without the threading becoming wedged, which would occur if the spindle could not deflect axially in the opposite direction. Since the motor is designed for a certain current consumption or can be switched off, it is essential for the return of the spindle and the release of the clamping device from its clamping position that the threads have not wedged, which required a correspondingly greater restoring force for the release of the wedging. which the engine is unable to perform.

Sofern nicht in anderer Weise bei Erreichen der öffnungsstellung der Spannvorrichtung (Drehantrieb und Stellglied sind dabei zusammengefahren) für eine Abschaltung des Drehantriebes gesorgt wird, kann vorteilhaft das gleiche Prinzip einer axialen Abfederung für diese Stellung ebenfalls zur Anwendung kommen, um auch bei dieser Stellung der Spannvorrichtung eine Verkeilung der Gewinde zu verhindern. Eine solche Axialfederung kann dafür entweder zwischen dem freien Ende der Spindel und im Inneren des Stellgliedes angeordnet werden, bevorzugt und vorteilhaft aber zwischen dem kupplungsseitigen Ende des Stellgliedes und einem entsprechenden Auflager im Vorrichtungshalter, denn eine Anordnung am freien Spindelende bedürfte einer Neueinstellung, wenn das Stellglied in sich bezüglich seiner Länge verändert würde.Unless the rotary drive is switched off when the opening position of the tensioning device is reached (rotary drive and actuator are moved together), the same principle of axial cushioning can advantageously also be used for this position, so that the tensioning device is also in this position to prevent wedging of the threads. Such an axial suspension can either be arranged between the free end of the spindle and inside the actuator, but preferably and advantageously between the coupling-side end of the actuator and a corresponding support in the device holder, because an arrangement on the free spindle end would require readjustment if the actuator would change in length.

In Rücksicht auf eine möglichst schlanke Bauweise der ganzen Vorrichtung wird der Motor bevorzugt und vorteilhaft koaxial zur Gewindespindel am Halter angeordnet.In view of the slim design of the entire device, the motor is preferably and advantageously arranged coaxially to the threaded spindle on the holder.

Die erfindungsgemäße Werkstückspannvorrichtung wird nachfolgend anhand der zeichnerischen Darstellung eines Ausführungsbeispieles näher erläutert.The workpiece clamping device according to the invention is explained in more detail below with reference to the drawing of an exemplary embodiment.

Es zeigt schematisch

  • Fig. 1 die Spannvorrichtung teilweise in Schnitt und Ansich in geöffneter Stellung;
  • Fig. 2 die gleiche Spannvorrichtung in geschlossener Stellung;
  • Fig. 3 einen vergrößerten Schnitt durch die schwimmende Lagerung und
  • Fig. 4 die Schaltung des Umkehr-Motors in besonderer Ausführungsform.
It shows schematically
  • Figure 1 shows the clamping device partially in section and Ansich in the open position.
  • Figure 2 shows the same clamping device in the closed position.
  • Fig. 3 is an enlarged section through the floating storage and
  • Fig. 4 shows the circuit of the reversing motor in a special embodiment.

Wie aus den Fig. 1, 2 erkennbar, besteht die Spannvorrichtung aus einem in einem Halter H schwenkbar gelagerten Spannhebel 14, der über ein Zwischenglied 13 mit einem axial im Halter H geführten, von einem Antrieb axial bewegbaren Stellglied 7 gelenkig verbunden ist. Dieses bekannte Bauprinzip derartiger Vorrichtungen ist also bei der vorliegenden Vorrichtung beibehalten, wobei jedoch der biser übliche Pneumatik- oder Hydraulik-Hubantrieb ersetzt ist durch einen in seiner Drehrichtung umk ehrbaren Drehantrieb und zwar in Form eines zur Spindel 3 koaxial angeordneten Umkehr-Motors 1 mit vorgeschaltetem Planetengetriebe 1ʹ und einer Axialkupplung 2, die, wie aus Fig. 2 ersichtlich, eine geringe axiale Verschiebung der Trapezgewindespindel 3 zuläßt, mit der die Axialkupplung 2 drehfest verbunden ist. Die Gewindespindel 3 ist mit einem Trapezgewinde 3ʹ mit geringer Steigung versehen, um eine Selbsthemmung zwischen der Spindel 3 und dem mit entsprechendem Innengewinde 3ʺ versehenen Stellglied 7 zu gewährleisten. Im dargestellten Ausführungsbeispiel ist das Stellglied aus zwei Teilen gebildet und zwar aus dem Stellglied-Kopfstück 7ʹ und einer mit entsprechendem Innengewinde versehenen Spindelhülse 7ʺ, auf die das Stellglied-Kopfstück 7ʹ aufgeschraubt und in gewünschter Stellung mittels einer Kontermutter 8 fixiert ist. Am Stellglied-Kopfstück 7ʹ ist das Zwischenglied 13 angelenkt, das seinerseits mit einem Ge lenkfortsatz 14ʹ des Spannhebels 14 gelenkig in Verbindung steht, welcher sich in Fig. 1 in Öffnungsstellung und in Fig. 2 in Schließ- und Spannstellung befindet. Der Halter H der Vorrichtung, in dem die gesamte Verstellmechanik gelagert ist, besteht, wie ersichtlich, aus mehreren Teilen, die alle mit 5 bezeichnet sind. Auf der spannhebelabgewandeten Seite ist das Stellglied-Kopfstück 7ʹ im gezeigten Ausführungsbeispiel mit einer Verdickung 15 versehen und zwar zur Aufnahme des einen Gelenkes des Zwischengliedes 13 und zur Aufnahme von kleinen Führungsrollen 16, die an einer Flachführung 17 des Halters H abgestützt geführt sind. Diese Art der Ausbildung des Stellglied-Kopfstückes ist ebenfalls bekannt. Andere Arten der Führung des Stellglied-Kopfstückes 7ʹ können allerdings ebenfalls zur Anwendung kommen. In Rücksicht auf eine Übertotpunktverriegelung des Spannhebels kommt jedoch die dargestellte Ausführungsform des Stellgliedes 7ʹ vorteilhaft zur Anwendung.As can be seen from FIGS. 1, 2, the tensioning device consists of a tensioning lever 14 which is pivotally mounted in a holder H and which is connected in an articulated manner via an intermediate member 13 to an actuator 7 axially guided in the holder H and axially movable by a drive. This known construction principle of such devices is thus retained in the present device, but the previously conventional pneumatic or hydraulic linear drive is replaced by a reversible rotary drive in its direction of rotation, namely in the form of a reversible motor 1 arranged coaxially with the spindle 3 with an upstream one Planetary gear 1ʹ and an axial clutch 2, which, as shown in Fig. 2, allows a small axial displacement of the trapezoidal screw 3, with which the axial clutch 2 is rotatably connected. The threaded spindle 3 is provided with a trapezoidal thread 3ʹ with a small pitch in order to ensure self-locking between the spindle 3 and the actuator 7 provided with a corresponding internal thread 3ʺ. In the illustrated embodiment, the actuator is formed from two parts, namely from the actuator head piece 7ʹ and a correspondingly internally threaded spindle sleeve 7ʺ, onto which the actuator head piece 7ʹ is screwed and fixed in the desired position by means of a lock nut 8. At the actuator head 7ʹ, the intermediate member 13 is articulated, which in turn with a Ge Steering extension 14ʹ of the clamping lever 14 is articulated in connection, which is in Fig. 1 in the open position and in Fig. 2 in the closed and clamping position. As can be seen, the holder H of the device, in which the entire adjustment mechanism is mounted, consists of several parts, all of which are designated by 5. On the side facing away from the tensioning lever, the actuator head piece 7ʹ in the exemplary embodiment shown is provided with a thickening 15, specifically for receiving the one joint of the intermediate member 13 and for receiving small guide rollers 16 which are supported on a flat guide 17 of the holder H. This type of design of the actuator head piece is also known. However, other types of guidance of the actuator head piece 7ʹ can also be used. In view of an over-center locking of the tensioning lever, however, the illustrated embodiment of the actuator 7ʹ is advantageously used.

Durch die Anordnung der "schwimmenden" Lagerung (Fig. 3) zwischen Spindel 3 und Kupplung 2 ist dafür gesorgt, daß sich in Spannstellung die Gewinde nicht schwer lösbar verkeilen können. Sofern überhaupt Endanschläge 4 zur Verhinderung des völligen Ausschraubens der Spindel 3 aus dem Stellglied 7 vorgesehen sind, so tritt auch diesbezüglich die Axialfederung 19 in Funktion, und es kann keine Selbstverkeilung der Gewinde erfolgen.The arrangement of the "floating" bearing (Fig. 3) between the spindle 3 and coupling 2 ensures that the threads can not wedge easily in the tensioned position. If any end stops 4 are provided to prevent the spindle 3 from being completely unscrewed from the actuator 7, the axial suspension 19 also functions in this regard, and the threads cannot self-wedge.

Wie insbesondere aus Fig. 2, 3 ersichtlich, ist die Trapezgewindespindel 3 mit ihrem antriebsseitigen Ende 3‴ verdrehfest aber axial verschieblich in der kleinen Kupplung 2 gelagert. Unmittelbar vor dieser Kupplung 2 ist die Trapezgewindespindel 3 mit zwei Radialkugellagern 10 versehen, die auf der Spindel 3 mit zwei Kontermuttern 12 festgelegt sind.As can be seen in particular from FIGS. 2, 3, the trapezoidal threaded spindle 3 is mounted in the small coupling 2 with its drive-side end 3 fest rotatably but axially displaceably. Immediately before this coupling 2, the trapezoidal threaded spindle 3 is provided with two radial ball bearings 10, which are fixed on the spindle 3 with two lock nuts 12.

Die beiden Radialkugellager 10 sind ihrerseits in einer Axialgleitbüchse 11 gelagert, die sich geringfügig in einer entsprechenden Gleitlagerführung 11ʹ des Halters H verschieben kann und die mit einem geeigneten Element 18 gegen Verdrehung gesichert ist. Der Umkehr-Motor 1 (Elektrogetriebemotor) ist für eine bestimmte Stromstärkenaufnahme ausgelegt und schltet bei Überlast ab, die dann vorliegt, wenn die Axialfederung 19 auf einen vorbestimmten Belastungswert zusammengedrückt ist.The two radial ball bearings 10 are in turn mounted in an axial sliding bush 11, which is slightly in one corresponding slide bearing guide 11ʹ of the holder H can move and is secured against rotation with a suitable element 18. The reversing motor 1 (electric gear motor) is designed for a specific current consumption and switches off in the event of an overload, which occurs when the axial suspension 19 is compressed to a predetermined load value.

Soll der Spannhebel 14 aus seiner Spannstellung, die auch eine Übertotpunktspannstellung sein kann, gelöst werden, so dreht sich der Motor 1, entsprechend umgeschaltet, nach der anderen Seite, wobei problemlos die bestehende Selbsthemmung der Gewinde überwunden wird, da keine Verkeilung zwischen den Gewinden vorliegt. Um eine solche Verkeilung zu verhindern, ist kuppelseitig die schwimmende Lagerung mit der Axialfederung 19 in Form einer Tellerfeder versehen, die gegen den Anschlag 20ʹ im Halter H verspannt ist. Dieser Anschlag kann ggf. auch einstellbar ausgebildet sein. Die Axialfederung 19 ist dabei, wie erwähnt, so ausgelegt, daß sie im ganz oder teilweise zusammengedrückten Zustand der maximal aufbringbaren Spannkraft am Spannhebel 14, wodurch gewährleistet wird aß bei Erreichen der Spannstellung keine weiteren Kräfte mehr in die Vorrichtung eingeleitet werden, die sonst zur Verkeilung der Gewinde führen würden.If the tensioning lever 14 is to be released from its tensioning position, which can also be an over-dead center tensioning position, the motor 1, correspondingly switched over, rotates to the other side, with the existing self-locking of the threads being overcome without problems since there is no wedging between the threads . In order to prevent such wedging, the floating bearing is provided on the dome side with the axial suspension 19 in the form of a plate spring which is braced against the stop 20ʹ in the holder H. This stop can optionally also be made adjustable. The axial suspension 19 is, as mentioned, designed so that in the fully or partially compressed state of the maximum tension force that can be applied to the tensioning lever 14, which ensures that no further forces are introduced into the device when the tensioning position is reached, which would otherwise lead to wedging the thread would lead.

Um bei der Rückstellung des Spannhebels 14 bzw. der ganzen Spannvorrichtung in die öffnungsstellung gemäß Fig. 1 zu gewährleisten, daß dann nicht ebenfalls eine Verkeilung der Gewinde eintritt, könnte selbstverständlich an geeigneter Stelle ein Endschalter 21 vorgesehen werden, der dem UmkehrMotor 1 rechtzeitig abschaltet. Es ist vorteilhaft aber auch möglich, wie aus Fig. 3 ersichtlich, eine entsprechende Axialfederung 19ʹ spannseitig vor der schwimmenden Lagerung anzuordnen, was einen solchen Endschalter entbehrlich macht. Diese Axialfederung 19ʹ wird deshalb in geeigneter Weise zwischen dem ersten Radialkugellager 10 und dem Anschlag 4ʹ des Halters H angeordnet, wodurch dann die dort angeordnete Axialfederung 19ʹ genau wie die Axialfederung 19 völlig unabhängig von der tatsächlich eingestellten Länge des Stellgliedes 7 zur Wirkung kommt. Die Axialfederung 19ʹ könnte zwar direkt am Anschlag 4ʹ angelegt werden, vorteilhaft kann aber auch für deren Einstellbarkeit der Anschlag in geeigneter Weise axial verstellbar ausgebildet sein, was nicht besonders dargestellt ist.In order to ensure that when the tensioning lever 14 or the entire tensioning device is reset to the open position according to FIG. 1 that the threads do not wedge, a limit switch 21 could of course be provided at a suitable point, which switches off the reversing motor 1 in good time. It is also advantageous, however, as can be seen from FIG. 3, to arrange a corresponding axial suspension 19ʹ on the tension side in front of the floating bearing, which makes such a limit switch unnecessary. This axial suspension 19ʹ is therefore in a suitable manner between the first radial ball bearing 10 and the stop 4ʹ Holder H arranged, whereby the axial suspension 19ʹ arranged there, just like the axial suspension 19, comes into effect completely independently of the actually set length of the actuator 7. The axial suspension 19ʹ could indeed be applied directly to the stop 4ʹ, but advantageously the stop can also be made axially adjustable in a suitable manner for its adjustability, which is not particularly shown.

Das Stellglied-Kopfstück 7ʹ bzw die einen Teil des Stellgliedes 7ʺ bildende Spindelhülse 7ʺ ist mit einem Endanschlag 6 in Form eines Ringbundes versehen, der mit dem vorerwähnten Anschlag 4 zusammenwirkt. Im dargestellten Ausführungsbeispiel bildet der Anschlag 4 einen Teil mit einer auswechselbaren, die Spindel 13 und das Stellglied 7 umfassenden Führungsbüchse 9, die, wie bspw. dargestellt, in geeigneter Weise in den Halter H integriert ist.The actuator head piece 7ʹ or the part of the actuator 7ʺ forming the spindle sleeve 7ʺ is provided with an end stop 6 in the form of an annular collar which interacts with the abovementioned stop 4. In the exemplary embodiment shown, the stop 4 forms a part with an exchangeable guide bush 9 which comprises the spindle 13 and the actuator 7 and which, as illustrated for example, is suitably integrated in the holder H.

Dieser Anschlag 4 dient nun dazu, ein völliges Ausschrauben der Spindel 3 aus dem Stellglied 7 dann zu verhindern, wenn der Spannhebel 14 aus irgendwelchen Gründen an einem Werkstück nicht zur Spannanlage käme, denn dann würde der Motor 1 nicht belastet, einfach weiterdrehen und je nach den konstruktiven Maßverhältnissen die Spindel 3 aus dem Stellglied 7 herausschrauben. Selbst wenn der Endanschlag 6 der Spindelhülse 7ʺ am Anschlag 4 zur Anlage kommt, ergibt sich keine Gewindeverkeilung, da dann wieder die "Schwimmende" Lagerung 20 in Funktion tritt.This stop 4 now serves to prevent the spindle 3 from being completely unscrewed from the actuator 7 if the clamping lever 14 does not come to the clamping system for some reason on a workpiece, because then the motor 1 would not be loaded, simply continue to rotate and depending on Unscrew the spindle 3 from the actuator 7 according to the structural dimensions. Even if the end stop 6 of the spindle sleeve 7 'comes to rest against the stop 4, there is no thread wedging, since the "floating" bearing 20 then comes into operation again.

Durch diese beschriebene Ausführungsform ist sichergestellt, daß keine Verkeilung der Gewindespindel 3 mit dem Stellglied 7 erfolgen kann. Wenn allerdings ungünstige Umstände hinzukommen, bspw. Ausdehnung des festgespannten Werkstückes auf Grund von Wärmeeinwirkung oder hohe Belastung des Spannarmes beim Zurückschwenken durch Zusatzlasten am Spannarm( bspw. formangepaßte Druckstücke, die am Spannarm befestigt werden müssen), kann der Fall eintreten, daß die Nennstromaufnahme des Motors 1 nicht ausreicht, um den Spannarm bzw. deesen Stellglied 7 aus seiner höher belasteten Endstellung herauszufahren. Aus diesem Grunde besteht eine vorteilhafte Weiterbildung der Vorrichtung darin, daß in der Schaltung des Umkehrmotors 1 zwei bezüglich der Stromaufnahme des Motors verhältnismäßig abgestimmte Meßkreise IC1 und IC2 derart enthalten sind, daß der Umkehrmotor 1 beim Anfahren aus den beiden Endstellungen eine höhere Stromzufuhr erhält als sie dem Nennstrom beim Einfahren in die Endstellungen entspricht. Die beiden Meßkreise sind dabei bevorzugt im Verhältnis 1 : 1,5 abgestimmt. Diese Schaltung ist in Fig.4 verdeutlicht.
Durch diese Schaltung wird solchen "Überlastfällen " dadurch Rechnung getragen, daß der Umkehrmotor 1 für den Moment des "Losbrechens" aus den Endstellungen extrem kurz eine über dem Nennstrom, für den er an sich ausgelegt ist, liegende Stromzufuhr erhält, die es ihm ermöglicht, die von außen in die Spannvorrichtung gelangte Überlast zu überwinden und "sanft" aus seinen Endstellungen herausfahren zu können. In der dargestellten Schaltung gemäß Fig.4 sind bezeichnet mit D 1 u. D 2 Zehner-Dioden, R 1 - R22 Widerstände, R 4 u.R 11 Trimmpotentiometer und mit IC3 u.IC4 Logikelemente. Bei den Optok 1-4 handelt es sich um optisch wirkende Schalter, und S1 und S2 sind die Taster bzw. Schalter für die Einleitung des Schließ- bzw. Öffnungsvorganges der Spannvorrichtung. Diese der Motorschaltung zugeordnete Schaltung erbeitet wie folgt:
Über den Taster S 1 wird das Startsignal gegeben, das den 1. und 2. Eingang S im IC3 setzt. Gleichzeitig wird der 4. Eingang R im IC3 zurückgesetzt. Im "Undglied" des IC4 wird der freie Durchgang geschaltet und über den Optokoppler 3 und K1 wird der Motor 1 zum Auffahren geschaltet. Gleichzeitig wird der Strom über den IC2 gemessen. Sobald der gezogens Strom den eingestellten Wert von R 11 überschreitet, schaltet der IC2 durch und der 1. Eingang R im IC3 wird zurückgesetzt, womit der Motor 1 abgeschaltet wird. Das Gleiche geschieht beim Zufahren des Spanners über den Taster S2 und den IC1. This described embodiment ensures that the threaded spindle 3 cannot wedge with the actuator 7. If, however, there are unfavorable circumstances, e.g. expansion of the clamped workpiece due to the effects of heat or high stress on the clamping arm when swiveling back due to additional loads on the tension arm (e.g. shape-matched pressure pieces that have to be fastened to the tension arm), it can happen that the nominal current consumption of the motor 1 is not sufficient to move the tension arm or its actuator 7 out of its more heavily loaded end position. For this reason, an advantageous further development of the device consists in the fact that the circuit of the reversing motor 1 contains two measuring circuits IC1 and IC2 which are relatively matched with respect to the current consumption of the motor in such a way that the reversing motor 1 receives a higher power supply than it when moving from the two end positions corresponds to the nominal current when moving into the end positions. The two measuring circuits are preferably adjusted in a ratio of 1: 1.5. This circuit is illustrated in Fig.4.
By means of this circuit, such "overload cases" are taken into account in that the reversing motor 1 receives an extremely short current from the end positions for the moment of "breakaway" from the end positions, which enables it to to overcome the overload that entered the clamping device from the outside and to be able to "gently" move out of its end positions. In the circuit shown in Figure 4 are denoted by D 1 u. D 2 Zener diodes, R 1 - R22 resistors, R 4 uR 11 trimming potentiometers and with IC3 and IC4 logic elements. The Optok 1-4 are optically acting switches, and S1 and S2 are the buttons or switches for initiating the closing or opening process of the clamping device. This circuit assigned to the motor circuit works as follows:
The start signal that sets the 1st and 2nd input S in the IC3 is given via the button S 1. At the same time, the 4th input R in IC3 is reset. The free passage is switched in the "undister" of the IC4 and the motor 1 is switched to open via the optocouplers 3 and K1. At the same time the current is measured via the IC2. As soon as the drawn current exceeds the set value of R 11, the IC2 switches through and the 1st input R in the IC3 is reset, whereby the motor 1 is switched off. The same happens when the tensioner is closed using button S2 and IC1.

Claims (13)

1. Elektromotorisch antreibbare Werkstückspannvorrichtung, bestehend aus einer von einem elektrischen Umkehrmotor antreibbaren und selbsthemmenden Gewindesteigung aufweisenden Gewindespindel, die mit einem mit Innengewinde versehenen, axial bewegbaren und gegen Verdrehung gesicherten Stellglied in Eingriff steht und ferner mit einer beim Erreichen der Spannstellung zwischen dem Stellglied und der Gewindespindel wirksam werdende Axialfeder versehen ist,
dadurch gekennzeichnet,
daß das Stellglied (7) über ein Zwischenglied (13) mit einem schwenkbar am Vorrichtungsgehäuse (H) gelagerten Spannhebel (14) verbunden ist,
daß der Umkehr-Motor (1) in Abhängigkeitä von der für die maximale Spannkraft erforderlichen Stromaufnahme abschaltbar ist,
daß der Umkehr-Motor über eine Axialkupplung (2) mit der Gewindespindel (3) gekuppelt ist, wobei das kupplungsseitige Ende der Gewindespindel drehfest und axial verschieblich mit der Axialkupplung verbunden ist,
daß ein schwimmend im Vorrichtungsgehäuse (H) gelagertes Gewindespindellager (20) zwischen der Axialkupplung (2) und dem Gewindeteil der Gewindespindel (3) vorgesehen ist und
daß mindestens eine Axialfeder (19) zwischen dem schwimmend gelagerten Gewindespindellager (20) und einer kupplungsseitigen Schulter (20ʹ) des Vorrichtungsgehäuses (H) angeordnet ist.1. Electromotively drivable workpiece clamping device, consisting of a threaded spindle that can be driven by an electric reversing motor and has a self-locking thread pitch, which engages with an axially movable, axially movable and secured against rotation actuator and also with one when the clamping position between the actuator and the actuator is reached Threaded spindle is effective axial spring is provided,
characterized,
that the actuator (7) is connected via an intermediate member (13) to a tension lever (14) pivotally mounted on the device housing (H),
that the reversing motor (1) can be switched off depending on the current consumption required for the maximum clamping force,
that the reversing motor is coupled to the threaded spindle (3) via an axial coupling (2), the end of the threaded spindle on the coupling side being connected to the axial coupling in a rotationally fixed and axially displaceable manner,
that a floating in the device housing (H) threaded spindle bearing (20) is provided between the axial coupling (2) and the threaded part of the threaded spindle (3) and
that at least one axial spring (19) is arranged between the floating threaded spindle bearing (20) and a coupling-side shoulder (20ʹ) of the device housing (H). 2. Vorrichtung nach Anspruch 1,
dadurch gekennzeichnet,
daß der Umkehr-Motor (1) koaxial zur Gewindespindel (3) angeordnet ist.2. Device according to claim 1,
characterized,
that the reversing motor (1) is arranged coaxially to the threaded spindle (3). 3. Vorrichtung nach Anspruch 1,
dadurch gekennzeichnet,
daß die kupplungsseitig angeordnete schwimmende Lagerung (20) der begrenzt axial beweglichen Gewindespindel (3) aus mindestens einem an der Spindel (3) festgelegten Radialkugellager (10) gebildet und dieses seinerseits unter kupplungsseitiger Zwischenschaltung der Axialfederung (19) in einer im Halter (H) beweglichen Axial-Gleitbüchse (11) gelagert ist.3. Device according to claim 1,
characterized,
that the coupling-side floating bearing (20) of the axially movable threaded spindle (3) consists of at least one radial ball bearing (10) fixed to the spindle (3) and this in turn with the coupling-side interposition of the axial suspension (19) in a holder (H) movable axial sliding bush (11) is mounted. 4. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet,
daß am Halter (H) spindelseitig vor der Lagerung (20) ebenfalls eine Axialfederung (19ʹ) angeordnet ist.4. Device according to one of claims 1 to 3, characterized in
that an axial suspension (19ʹ) is also arranged on the holder (H) on the spindle side in front of the bearing (20). 5. Vorrichtung nach einem der Ansprüche 1 bis 4,
dadurch gekennzeichnet,
daß die Axialfederungen (19, 19ʹ) als Tellerfedern ausgebildet sind.5. Device according to one of claims 1 to 4,
characterized,
that the axial springs (19, 19ʹ) are designed as disc springs. 6. Vorrichtung nach einem der Ansprüche 2 bis 4,
dadurch gekennzeichnet,
daß kupplungs- bzw. antriebsseitig im Stellweg der Axial-Gleitbüchse (11) oder des Radialkugellagers (10) ein Sicherheitsendschalter (21) angeordnet ist.6. Device according to one of claims 2 to 4,
characterized,
that a safety limit switch (21) is arranged on the coupling or drive side in the travel of the axial sliding bush (11) or the radial ball bearing (10). 7. Vorrichtung nach einem der Ansprüche 1 bis 6,
dadurch gekennzeichnet,
daß das Stellglied-Kopfstück (7ʹ) auf die Spindelhülse (7ʺ) aufschraubbar ausgebildet und an der Spindelhülse (7ʺ) mit einer Kontermutter (8) fixierbar angeordnet ist.7. Device according to one of claims 1 to 6,
characterized,
that the actuator head piece (7ʹ) is designed to be screwed onto the spindle sleeve (7ʺ) and can be fixed on the spindle sleeve (7ierbar) with a lock nut (8). 8. Vorrichtung nach einem der Ansprüche 1 bis 7,
dadurch gekennzeichnet,
daß das Widerlager (20ʹ) der Axialfeder (19) am Halter (H) ein stellbar ausgebildet ist.8. Device according to one of claims 1 to 7,
characterized,
that the abutment (20ʹ) of the axial spring (19) on the holder (H) is an adjustable. 9. Vorrichtung nach einem der Ansprüche 3 bis 8,
dadurch gekennzeichnet,
daß auch das Widerlager (20ʹ) der Axialfederung (19ʹ) am Halter (H) einstellbar ausgebildet ist.9. Device according to one of claims 3 to 8,
characterized,
that the abutment (20ʹ) of the axial suspension (19ʹ) on the holder (H) is adjustable. 10. Vorrichtung nach einem der Ansprüche 1 bis 9,
dadurch gekennzeichnet,
daß im Halter (H) ein antriebsferner Endanschlag (4) angeordnet ist.10. The device according to one of claims 1 to 9,
characterized,
that an end stop (4) remote from the drive is arranged in the holder (H). 11. Vorrichtung nach Anspruch 10,
dadurch gekennzeichnet,
daß der antriebsferne Endanschlag (4) als Teil einer im Halter (H) angeordneten, auswechselbaren, die Spindel (3) und das Stellglied (7) umfassenden Führungsbüchse (9) ausgebildet ist.11. The device according to claim 10,
characterized,
that the drive stop (4) remote from the drive is designed as part of an interchangeable guide bush (9) which is arranged in the holder (H) and comprises the spindle (3) and the actuator (7). 12. Vorrichtung insbesondere nach einem der Ansprüche 1 bis 11,
dadurch gekennzeichnet,
daß in der Schaltung des Umkehrmotors (1) zwei bezüglich der Stromaufnahme des Motors verhältnismäßig abgestimmte Meßkreise(IC1 u. IC2) derart enthalten sind, daß der Umkehrmotor(1) beim Anfahren aus den beiden Endstellungen eine höhere Stromaufnahme hat als sie dem Nennstrom beim Einfahren in die Endstellungen entspricht.12. The device in particular according to one of claims 1 to 11,
characterized,
that in the circuit of the reversing motor (1) two relatively coordinated with respect to the current consumption of the motor Measuring circuits (IC1 and IC2) are contained in such a way that the reversing motor (1) has a higher current consumption when moving from the two end positions than it corresponds to the nominal current when moving into the end positions. 13. Vorrichtung nach Anspruch 12,
dadurch gekennzeichnet,
daß die beiden Meßkreise(IC1 u. IC2) im Verhältnis 1:1,5 abgestimmt sind.13. The apparatus according to claim 12,
characterized,
that the two measuring circuits (IC1 and IC2) are matched in a ratio of 1: 1.5.
EP87116504A 1986-11-11 1987-11-09 Electromotive clamping device for work pieces Expired - Lifetime EP0268176B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87116504T ATE64707T1 (en) 1986-11-11 1987-11-09 WORKPIECE CLAMPING DEVICE DRIVEN BY ELECTROMOTORS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3638526 1986-11-11
DE3638526A DE3638526C1 (en) 1986-11-11 1986-11-11 Workpiece clamping device that can be driven by an electric motor

Publications (2)

Publication Number Publication Date
EP0268176A1 true EP0268176A1 (en) 1988-05-25
EP0268176B1 EP0268176B1 (en) 1991-06-26

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Country Link
EP (1) EP0268176B1 (en)
AT (1) ATE64707T1 (en)
DE (2) DE3638526C1 (en)
ES (1) ES2023172B3 (en)

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US9281775B2 (en) 2011-09-19 2016-03-08 Ludwig Ehrhardt Gmbh Clamping device with an electric motor
CN113977994A (en) * 2021-11-19 2022-01-28 南京航空航天大学 Clamping device for quick repair of additive manufacturing of carbon fiber reinforced composite material

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US4723767A (en) * 1986-08-08 1988-02-09 De-Sta-Co Division, Dover Resources, Inc. Rotary powered linear actuated clamp
DE3911073C1 (en) * 1989-04-06 1990-07-26 Kontec Gmbh, 6710 Frankenthal, De
DE4019936A1 (en) * 1990-06-22 1992-02-13 Airbus Gmbh DEVICE FOR ADJUSTING THE HEIGHT OF A TENSIONER
DE4104089C1 (en) * 1991-02-11 1992-08-13 Rinke Druckluft Gmbh Entwicklung-Montage-Technik, 3513 Staufenberg, De Power gripping tool with spindle drive in housing - has spindle with non-rotatable threaded sleeve, axially movable by link
FR2677570A1 (en) * 1991-06-13 1992-12-18 Badart Jacques Device for clamping a body with respect to a reference frame
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DE20018114U1 (en) * 2000-10-23 2002-02-28 Sta Co Mettallerzeugnisse Gmbh Electrically actuated workpiece clamping device
ES2227344T3 (en) 2001-04-19 2005-04-01 Univer S.P.A. FIXING DEVICE WITH BISTABLE LEVER.
DE102005055966A1 (en) * 2005-11-22 2007-05-24 Schunk Gmbh & Co. Kg Spann- Und Greiftechnik Sheet metal pickup or clamp assembly for automated manufacturing e.g. industrial robot with pneumatic drive
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EP0764076A1 (en) * 1994-06-06 1997-03-26 Incoe Corporation Electric mold clamp
EP0764076A4 (en) * 1994-06-06 1998-04-15 Incoe Corp Electric mold clamp
EP0919338A2 (en) * 1994-06-06 1999-06-02 Incoe Corporation Electric mold clamp
EP0919338A3 (en) * 1994-06-06 1999-06-09 Incoe Corporation Electric mold clamp
EP0982099A2 (en) * 1998-08-26 2000-03-01 ISI Norgren Inc. Power operated clamp
EP0982099A3 (en) * 1998-08-26 2002-05-02 Norgren Automotive Inc. Power operated clamp
WO2002034473A1 (en) * 2000-10-24 2002-05-02 De-Sta-Co Metallerzeugnisse Gmbh Electromotively actuatable clamping device
DE10052857A1 (en) * 2000-10-24 2002-05-02 Sta Co Mettallerzeugnisse Gmbh Workpiece clamping device which can be actuated by an electric motor
EP1350591A1 (en) * 2002-04-02 2003-10-08 Luciano Migliori clamping device for laser welding
US6812428B2 (en) 2002-04-02 2004-11-02 Luciano Migliori Clamping device for laser welding
US9281775B2 (en) 2011-09-19 2016-03-08 Ludwig Ehrhardt Gmbh Clamping device with an electric motor
CN113977994A (en) * 2021-11-19 2022-01-28 南京航空航天大学 Clamping device for quick repair of additive manufacturing of carbon fiber reinforced composite material

Also Published As

Publication number Publication date
DE3638526C1 (en) 1987-07-30
ATE64707T1 (en) 1991-07-15
ES2023172B3 (en) 1992-01-01
EP0268176B1 (en) 1991-06-26
DE3771035D1 (en) 1991-08-01

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