EP0268176B1 - Dispositif électromoteur de serrage de pièces - Google Patents

Dispositif électromoteur de serrage de pièces Download PDF

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Publication number
EP0268176B1
EP0268176B1 EP87116504A EP87116504A EP0268176B1 EP 0268176 B1 EP0268176 B1 EP 0268176B1 EP 87116504 A EP87116504 A EP 87116504A EP 87116504 A EP87116504 A EP 87116504A EP 0268176 B1 EP0268176 B1 EP 0268176B1
Authority
EP
European Patent Office
Prior art keywords
threaded spindle
housing
axial
clamping
spindle
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.)
Expired - Lifetime
Application number
EP87116504A
Other languages
German (de)
English (en)
Other versions
EP0268176A1 (fr
Inventor
Reinhard Hafeneger
Peter Walther
Michel Buchenau
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.)
DESTACO Europe GmbH
Original Assignee
DE STA CO Metallerzeugnisse GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by DE STA CO Metallerzeugnisse GmbH filed Critical DE STA CO Metallerzeugnisse GmbH
Priority to AT87116504T priority Critical patent/ATE64707T1/de
Publication of EP0268176A1 publication Critical patent/EP0268176A1/fr
Application granted granted Critical
Publication of EP0268176B1 publication Critical patent/EP0268176B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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 a workpiece clamping device that can be driven by an electric motor according to the preamble of claim 1.
  • Such a tensioning device is known from FR-A-2 036 980.
  • Clamping devices also provided with an electric rotary drive 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 Actuation of mandrels, pliers and chucks determined, these devices can also be equipped with a spring to allow elastic clamping.
  • 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 that are actually of interest here are known, for example, from DE-A-30 22 376, but also from the following publications; DE-A-19 50 721, 12 68 074, DE-A-22 22 686, FR-A-12 55 515 and finally according to US-A-31 16 058. All of these known clamping devices are pneumatic or hydraulic Drives provided, the translatory stroke movement of the actuating elements articulated in the device into the pivoting movement of the clamping lever is implemented.
  • the invention has for its object to improve a device of the type mentioned in such a way that a wedging in each clamping end position, i.e. should be preventable in the bottom, dead center and also over dead center clamping position, even in the case of unfavorable, additional circumstances.
  • FR-A-2 036 980 mentioned at the outset which is the starting point here, is apparently, without taking into account any risk of wedging at all, solely about the motor being brought to the device when the load increases or when the vehicle approaches an obstacle belonging elements, which are integrated in the device (spindle collar, brake or insulating disks and contacts), can be easily switched off.
  • the device known according to FR-A would therefore be conditionally suitable for adjustment processes subject to any loads, but not for tensioning devices of the type present here, for which, on the one hand, there has always been a desire to be able to drive them electrically as well as the known hydraulic or pneumatic drives , on the other hand, this is always divorced from the wedging of the threads involved.
  • 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 .
  • the clamping lever is first brought into contact with the workpiece without axially retracting the axial suspension. 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.
  • the motor 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 lifting drive is replaced by a reversible rotary drive in the direction of rotation, namely in the form of a reversing motor 1 arranged coaxially with the spindle 3 with an upstream planetary gear 1 ⁇ and an axial coupling 2, which, as can be seen from 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 an articular process 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 ′′ ′′ in a torsion-proof but axially displaceable manner.
  • the trapezoidal screw 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 the reversing motor 1 in good time switches off. 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, like the axial suspension 19, comes into effect completely independently of the length of the actuator 7 that is actually set.
  • 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), the case may occur 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 device is designed such 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 current supply when moving from the two end positions than the nominal current when entering 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.

Landscapes

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

Claims (8)

  1. Dispositif de serrage de pièces actionné par moteur électrique, constitué d'une broche filetée (3) entraînée par un moteur électrique réversible (1) et présentant un pas de filetage à blocage automatique, cette broche engrenant avec un organe de manoeuvre (7) muni d'un filetage intérieur, mobile en direction axiale et garanti contre la rotation, la broche étant en outre munie d'une suspension élastique intervenant lorsque l'organe de manoeuvre (7) atteint la position de serrage et s'appuyant sur le carter (H) du dispositif, le moteur (1) pouvant être coupé en cas de surcharge et étant relié a la broche filetée (3) par l'intermédiaire d'un accouplement axial (2) avec possibilité de coulissement axial mais solidairement en rotation, un palier de broche filetée (10) étant disposé dans le carter (H) du dispositif entre l'accouplement axial (2) et la broche filetée (3),
       caractérisé en ce que l'organe de manoeuvre (7) est relié, au moyen d'un organe intermédiaire (13) le garantissant contre la rotation, à un levier de serrage (14) monté a pivot a l'extrémité du carter (H) du dispositif éloigné de la commande d'entraînement,
       que le palier de broche filetée (10) fixé sur la broche filetée (3) est monté pour coulisser en direction axiale dans le carter (H) du dispositif et s'appuie sur le carter (H) du dispositif avec interposition d'un côté et de l'autre de ressorts axiaux (19, 19') constituant la suspension élastique et que le circuit du moteur réversible (1), qui peut être coupé en fonction du courant nécessaire pour la force de serrage maximale, contient deux circuits de mesure (IC1 et IC2) accordés l'un par rapport à l'autre de manière que le moteur réversible (1) absorbe, lors du démarrage à partir des deux positions d'extrémité, un courant plus élevé que le courant nominal lors du déplacement dans ces positions d'extrémité.
  2. Dispositif selon la revendication 1, caractérisé en ce que le palier de broche filetée (10) est monté dans une douille de glissement axial (11) mobile dans le carter (H) du dispositif.
  3. Dispositif selon la revendication 1 ou 2, caractérisé en ce que les ressorts axiaux (19, 19') sont constitués sous forme de ressorts Belleville.
  4. Dispositif selon l'une des revendications 1 à 3, caractérisé en ce qu'un interrupteur de fin de course de sécurité (21) est disposé, du côté de l'accouplement ou de l'entraînement, sur la course du palier de broche filetée (10) ou de la douille de glissement axial (11).
  5. Dispositif selon l'une des revendications 1 à 4, caractérisé en ce que l'organe de manoeuvre (7) est constitué d'une pièce de tête (7') et d'un manchon (7"), la pièce de tête (7') se vissant sur le manchon de broche (7") et pouvant être fixée par un contre-écrou (8).
  6. Dispositif selon l'une des revendications 1 à 5, caractérisé en ce qu'on moins l'un (19) des ressorts axiaux est appliqué sur un appui de butée (20') réglable dans le carter (H) du dispositif.
  7. Dispositif selon l'une des revendications 1 à 6, caractérisé en ce qu'une butée d'extrémité (4) éloignée de la commande est disposée dans le carter (H) du dispositif, cette butée étant constituée en tant que partie d'une douille (9) disposée dans le carter (H) du dispositif et entourant la broche filetée (3) ainsi que l'organe de manoeuvre (7).
  8. Dispositif selon l'une des revendications 1 à 7, caractérisé en ce que les deux circuits de mesure (IC1 et IC2) sont accordés dans le rapport 1 : 1,5
EP87116504A 1986-11-11 1987-11-09 Dispositif électromoteur de serrage de pièces Expired - Lifetime EP0268176B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87116504T ATE64707T1 (de) 1986-11-11 1987-11-09 Elektromotorisch antreibbare werkstueckspannvorrichtung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3638526 1986-11-11
DE3638526A DE3638526C1 (de) 1986-11-11 1986-11-11 Elektromotorisch antreibbare Werkstueckspannvorrichtung

Publications (2)

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

Family

ID=6313707

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87116504A Expired - Lifetime EP0268176B1 (fr) 1986-11-11 1987-11-09 Dispositif électromoteur de serrage de pièces

Country Status (4)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6739587B2 (en) 2001-04-19 2004-05-25 Luciano Migliori Toggle lever clamping device

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3613644A1 (de) * 1986-04-23 1987-10-29 Josef Gerhard Tuenkers Kraftangetriebene kniehebelspannvorrichtung
US4723767A (en) * 1986-08-08 1988-02-09 De-Sta-Co Division, Dover Resources, Inc. Rotary powered linear actuated clamp
DE3911073C1 (fr) * 1989-04-06 1990-07-26 Kontec Gmbh, 6710 Frankenthal, De
DE4019936A1 (de) * 1990-06-22 1992-02-13 Airbus Gmbh Vorrichtung zur hoehenverstellung einer spanneinrichtung
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 (fr) * 1991-06-13 1992-12-18 Badart Jacques Dispositif de serrage d'un corps par rapport a un referentiel.
US5643613A (en) * 1994-06-06 1997-07-01 Incoe Corporation Apparatus for clamping molds in injection molding machines
DE9412722U1 (de) * 1994-08-06 1994-09-29 Sta Co Mettallerzeugnisse Gmbh Kniehebelspannvorrichtung
FR2755049A1 (fr) * 1996-10-25 1998-04-30 Ragonot Serrage pilote compact
US6199846B1 (en) * 1998-04-28 2001-03-13 Isi Norgren, Inc. Electric power operated clamp with spring lock
DE20018114U1 (de) * 2000-10-23 2002-02-28 Sta Co Mettallerzeugnisse Gmbh Elektrisch betätigbare Werkstück-Spannvorrichtung
DE10052857A1 (de) * 2000-10-24 2002-05-02 Sta Co Mettallerzeugnisse Gmbh Elektromotorisch betätigbare Werkstückspannvorrichtung
ITMI20020683A1 (it) * 2002-04-02 2003-10-02 Luciano Migliori Dispositivo di pinzatura per saldature laser
DE102005055966A1 (de) * 2005-11-22 2007-05-24 Schunk Gmbh & Co. Kg Spann- Und Greiftechnik Blechgreif- oder Blechspannvorrichtung
DE102011113765A1 (de) * 2011-09-19 2013-03-21 Ludwig Ehrhardt Gmbh Spannvorrichtung mit einem Elektromotor
DE202012102578U1 (de) * 2012-07-12 2013-10-14 Röhm Gmbh Magnetspannvorrichtung
CN113977994A (zh) * 2021-11-19 2022-01-28 南京航空航天大学 一种碳纤维增强复合材料增材制造快速修复用夹持装置

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1255515A (fr) * 1960-01-29 1961-03-10 Forges Stephanoises Sa Des Serre-joint
US3116058A (en) * 1961-03-31 1963-12-31 Leland F Blatt Cylinder operated power clamp
FR2036980B1 (fr) * 1969-04-25 1974-06-14 Croizer Jean
DE2222686B2 (de) * 1972-05-09 1980-06-12 Tuenkers Maschinenbau Gmbh, 4030 Ratingen Druckmittelbetatigte Kniehebelspannvorrichtung, insbesondere für Karosserieteile
US4137784A (en) * 1977-11-14 1979-02-06 Industrial Device Corporation Electromechanical equivalent of fluid powered cylinder
DE3022376C2 (de) * 1980-06-14 1985-08-01 De-Sta-Co Metallerzeugnisse Gmbh, 6000 Frankfurt Kniehebelspannvorrichtung zum Festspannen von Werkstücken
CH665119A5 (de) * 1984-04-30 1988-04-29 Wiederkehr Hans Elektrische spannvorrichtung fuer orthopaedische justiervorrichtungen.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6739587B2 (en) 2001-04-19 2004-05-25 Luciano Migliori Toggle lever clamping device

Also Published As

Publication number Publication date
ES2023172B3 (es) 1992-01-01
DE3638526C1 (de) 1987-07-30
DE3771035D1 (de) 1991-08-01
ATE64707T1 (de) 1991-07-15
EP0268176A1 (fr) 1988-05-25

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