EP0582792B1 - Dispositif de réglage de la force de serrage dans un dispositif de serrage en particulier pour un étau de machine-outil - Google Patents

Dispositif de réglage de la force de serrage dans un dispositif de serrage en particulier pour un étau de machine-outil Download PDF

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Publication number
EP0582792B1
EP0582792B1 EP93108265A EP93108265A EP0582792B1 EP 0582792 B1 EP0582792 B1 EP 0582792B1 EP 93108265 A EP93108265 A EP 93108265A EP 93108265 A EP93108265 A EP 93108265A EP 0582792 B1 EP0582792 B1 EP 0582792B1
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EP
European Patent Office
Prior art keywords
abutment
spindle
adjusting sleeve
sleeve
rotation
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
EP93108265A
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German (de)
English (en)
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EP0582792A1 (fr
Inventor
Karl Pesch
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Individual
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Individual
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Publication of EP0582792A1 publication Critical patent/EP0582792A1/fr
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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
    • B25B1/00—Vices
    • B25B1/06—Arrangements for positively actuating jaws
    • B25B1/10—Arrangements for positively actuating jaws using screws
    • B25B1/106—Arrangements for positively actuating jaws using screws with mechanical or hydraulic power amplifiers
    • 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
    • B25B1/00—Vices
    • B25B1/24—Details, e.g. jaws of special shape, slideways

Definitions

  • the invention relates to an adjusting device for the clamping force in a clamping device with two clamping parts that can be moved relative to one another, a force amplifier generating the clamping force and a drive thread spindle that actuates the force amplifier and is guided in an internal thread of a spindle carrier, which, for its own actuation, has a spindle end projecting axially from the spindle carrier and one has a fixed stop, for which a stop device that can be preset depending on the amount of clamping force is provided on the spindle carrier, in particular in the case of a machine vise with a hollow overdrive spindle forming the spindle carrier, which can be rotated in a spindle nut connected to one of the clamping parts and in the direction of rotation via a torque coupling can be coupled with the coaxially arranged drive screw.
  • Such setting devices are known from DE 27 10 424 C2.
  • the workpiece is preloaded between the clamping parts via the overdrive spindle, which is initially carried along when the drive threaded spindle is rotated via the torque coupling, until the torque coupling uncouples the overdrive spindle from the drive threaded spindle as the clamping force increases, so that the final clamping of the workpiece only continues when the drive threaded spindle is turned still done via the booster.
  • the preselectable stop device is used in conjunction with the stop on the drive threaded spindle to preset the clamping force and limit it to the preselected maximum value. In the known case, the stop is located on the end region of the drive threaded spindle protruding from the overdrive spindle.
  • the presettable stop device comprises a stop sleeve arranged on the overdrive spindle, against which the stop comes to rest axially when the drive threaded spindle is rotated, thereby preventing the drive threaded spindle from rotating further in the sense of an even higher clamping force.
  • the stop sleeve is axially adjustable on the overdrive spindle for changing the stop position of the drive threaded spindle and can be fixed in its respective position in such a way that it cannot be moved axially further by the stop of the drive threaded spindle.
  • the stop sleeve depending on its setting on the overdrive spindle, permits adjustment of the drive threaded spindle in the sense of an increase in the clamping force only until the stop the drive threaded spindle hits the stop sleeve.
  • This clamping force limitation is independent of the respective actual position of the overdrive spindle, because the stop device, including the stop sleeve, participates in the movement of the overdrive spindle, that is, both in its rotation and axial adjustment.
  • Each setting of the stop sleeve on the overdrive spindle therefore corresponds to the same value of the clamping force regardless of the position of the overdrive spindle and thus of the size of the workpiece to be clamped.
  • This known adjusting device has proven itself very well in practice, but has the disadvantage that the stop of the drive thread spindle can axially brace against the stop sleeve, which not only has a correspondingly high stability of both the stop sleeve itself and its fixing the overdrive spindle requires, but can also lead to the drive threaded spindle being difficult to release from its tension on the stop sleeve.
  • the invention is based on the object of designing an adjusting device of the type mentioned in such a way that the clamping force limitation cannot lead to tension of the drive threaded spindle on the stop device.
  • the fixed stop is formed by a radial projection on the circumference of the drive screw which, when the drive screw rotates, has a helical adjustment path of the same pitch as the thread pitch of the Passes through the drive screw and is surrounded by a coaxial cage sleeve fixed to the spindle carrier, in the wall of which, over the helical adjustment path of the stop projection, receiving windows are formed in which radially displaceable stop pieces are held and supported on an adjusting sleeve which is adjustable on the outside of the cage sleeve, whereby on of the adjusting sleeve in their adjustment direction are designed for the individual stop pieces such that, depending on the presetting of the adjusting sleeve, at least one of the stop pieces protrudes radially in its helical adjustment path as a stop for the stop projection and all stop pieces lying in front of it on the helical adjustment path in the direction of a smaller clamping force withdrawn from the adjustment path
  • the advantage achieved thereby consists essentially in the fact that, in the setting device according to the invention, the stop projection comes into contact with the stop parts in the direction of rotation of the working threaded spindle, i.e. tensions between the stop projection on the one hand and the stop pieces on the other hand are not possible via the thread of the working threaded spindle.
  • the stop device is therefore not heavily loaded and the drive screw can always be easily released from any of its stop positions.
  • the adjusting sleeve allows the presetting of the clamping force in a simple and clear manner, since it determines solely by its position relative to the spindle carrier which connector on the stop projection Drive threaded spindle comes to rest, so how far the stop projection can run through its helical adjustment path and enables the adjustment of the drive threaded spindle to actuate the power amplifier.
  • a particularly preferred embodiment of the invention is characterized in that the adjusting sleeve on the cage sleeve is axially immovable and can be rotated by a maximum of 360 ° from an initial position in which the drive threaded spindle by engaging the stop projection in order to preset the clamping force against the direction of rotation of the drive threaded spindle leading to higher clamping force is blocked on the first stop piece on its helical adjustment path, the adjusting sleeve being presettable in predetermined rotational positions assigned to the individual stop pieces, which are spaced apart in the direction of rotation by at least the angular dimension of the stop pieces, and in that the control curves extending in the direction of rotation of the adjusting sleeve are formed on the inside of the sleeve ,
  • the complete radial exit of the stop pieces from the helical adjustment path of the stop projection have pockets that are in the in the starting position start the standing adjusting sleeve behind the respectively assigned stop piece after an angle of rotation and extend over an
  • This arrangement is associated with the very important advantage that regardless of the angle of rotation of the drive threaded spindle, which will usually be more than 360 ° for the various presettable clamping force sizes, the maximum angle of rotation of the adjusting sleeve used for presetting is always less or at most 360 °.
  • the rotational positions of the drive threaded spindle which are distributed over several full revolutions, are therefore assigned to the rotational positions of the adjusting sleeve in a clear, clear and unmistakable manner over at most only one full sleeve rotation, the actual maximum angle of rotation of the adjusting sleeve still being freely selectable.
  • a locking device is expediently provided between the adjusting sleeve and the cage sleeve with a spring-loaded locking member on one sleeve and locking receptacles for the locking member on the other sleeve, the locking receptacles being arranged in the direction of rotation of the adjusting sleeve so that the locking member is respectively assigned to the stop pieces, predetermined rotational positions of the adjusting sleeve engages.
  • the rotational positions specified for the adjusting sleeve can be easily found when the adjusting sleeve is rotated, so that the adjusting sleeve can be easily adjusted into these predetermined rotating positions.
  • the axial dimensions of the stop pieces are less than twice the pitch of the helical adjustment path of the stop projection.
  • Successive stop pieces can then lie close together in adjacent turns of this adjustment path without interfering in their effect.
  • the stop pieces are expediently designed as balls and the receiving fixtures as radial cylindrical bores, the stop pieces projecting by at most half the ball diameter into the helical adjustment path of the stop projection, so that they can be easily pushed back from the stop projection out of its adjustment path by the adjusting sleeve if appropriately released.
  • a machine vice generally denoted by 1, only the vice body 2 and a slide 3, which is displaceably guided therein, is shown, which carries a clamping jaw 3 'which is movable with the slide.
  • This movable clamping jaw is opposed as a second clamping part to a fixed clamping jaw connected to vice body 2.
  • a workpiece also not shown in the drawing, is clamped between the two clamping jaws.
  • a hollow overdrive spindle 4 is first used, which is axially immovably mounted in the vice body 2 and can be rotated in a spindle nut which is also not shown in the drawing and is firmly connected to the slide 3.
  • a power amplifier also not shown, and a drive thread spindle 5, which actuates the power amplifier and is guided in an internal thread of the overdrive spindle 4 which forms the spindle carrier and which, for its own actuation, has a spindle end 6 projecting axially from the overdrive spindle 4, is used for the further generation of the clamping force.
  • This spindle end 6 is provided with a hexagon socket 7 for attaching an actuating key.
  • the drive threaded spindle 5 is coupled to the overdrive spindle 4 via a torque coupling 8.
  • This torque clutch consists of a coupling pin 9, which is guided transversely displaceably in the drive threaded spindle 5 and engages in a coupling receptacle 10 in the overdrive spindle 4.
  • the coupling pin 9 In the engaged position, the coupling pin 9 is held by a spring-loaded ball 11, which in turn engages in a locking recess 12 formed on the coupling pin 9.
  • the overdrive spindle 4 is first taken along when the drive threaded spindle 5 is rotated via the torque coupling 8. If the clamping parts then rest on the workpiece and the overdrive spindle 4 is no longer adjustable, the torque clutch 8 disengages, so that only the Drive screw 5 can be rotated further to actuate the power amplifier.
  • a stop 13 ' is provided on the drive threaded spindle 5 and a stop device for this stop is provided on the overdrive spindle, which prevents further rotation of the drive threaded spindle 5 when the preset clamping force is generated.
  • the fixed stop 13 ' is formed by a radial projection 13 on the circumference of the drive threaded spindle 5.
  • This stop projection 13 passes through a screw-shaped adjustment path 14 with the same pitch as the thread pitch of the drive thread spindle 5 when the drive thread spindle 5 is rotated.
  • This adjustment path 14 is also indicated schematically in the developments according to FIGS. 4, 6, 8, 10 and 12.
  • the drive threaded spindle 5 with its stop projection 13 is surrounded by a coaxial cage sleeve 15, which is connected to the overdrive spindle 4 in an axially immovable and rotationally fixed manner by means of dowel pins 16.
  • Receiving windows 17 are formed in the wall of this cage sleeve 15, distributed over the helical adjustment path 14 of the stop projection 13, in which five radially displaceable stop pieces 18.1 to 18.5 are held. These stop pieces 18.1 to 18.5 are designed as balls, the receiving windows 17 as cylindrical bores which enable the balls to move radially.
  • the angle scale shown on the right shows the rotation of the drive threaded spindle 5 in the direction of rotation to a higher clamping force, represented by the arrow 19 the helical adjustment path 14 of the stop projection 13 over four full revolutions of the drive threaded spindle 5.
  • the angle counting begins at 0 ° in the position of the drive threaded spindle 5 in which its decoupling from the overdrive spindle 4 takes place. In this position, the first stop piece 18.1 is provided.
  • the second stop piece 18.2 is further along the helical adjustment path 14 by an angle of 390 °, the third stop piece 18.3 by an angle of 720 °, the fourth stop piece 18.4 by an angle of 1110 ° and the fifth and last stop piece 18.5 by four full revolutions, i.e. an angle of 1440 ° further.
  • the stop pieces 18.1 to 18.5 are supported on an adjusting sleeve 21, which is axially immovable and rotatable on the outside of the cage sleeve 15.
  • control curves for the individual stop pieces 18.1 to 18.5 such that, depending on the presetting of the adjusting sleeve 21, at least one of the stop pieces as a stop for the stop projection 13 radially in its helical adjustment path 14 protrudes and all stop pieces lying in front on the helical adjustment path in the direction of smaller clamping force are pushed back out of the adjustment path 14 by the stop projection 13 when passing the respective stop piece, for which purpose the stop projection 13 on its front and rear end faces in the direction of rotation is equipped with corresponding bevels or fillets is.
  • the adjusting sleeve 21 is for presetting the clamping force against the direction of rotation leading to a higher clamping force, ie in the direction of arrow 20, of the drive screw 5 at most 360 °, in the exemplary embodiment only rotatable by 120 ° from the initial position (scale number 0), in which the drive threaded spindle 5 is blocked by the abutment projection 13 resting on the first stop piece 18.1 on the helical adjustment path 14, as shown in FIGS. 3 and 4 . From this starting position, the adjusting sleeve 21 can be preset in predetermined rotational positions assigned to the individual stop pieces 18.2 to 18.5. In these presettable rotary positions, which in FIGS.
  • the adjusting sleeve 21 snaps onto the cage sleeve 15, for which purpose an axially displaceable and by a Spring-loaded locking member 22, not shown, is provided and engages in locking receptacles 23 provided in the cage sleeve 15.
  • These locking receptacles 23 are arranged on the cage sleeve 15 in the direction of rotation of the adjusting sleeve 21 such that the locking member 22 engages in the predetermined rotational positions of the adjusting sleeve 21 assigned to the stop pieces 18.1 to 18.5.
  • These predeterminable rotational positions of the adjusting sleeve 21 assigned to the individual stop pieces differ from one another in the direction of rotation by 30 °, that is to say by more than the angular dimension 25 of the stop pieces 18.1 to 18.5 related to the spindle axis 24, so that each further rotation of the adjusting sleeve 21 into the respectively predetermined rotational position the stop piece previously blocked by the adjusting sleeve 21 is also really released.
  • the control curves running in the direction of rotation of the adjusting sleeve 21 then contain, on support surfaces 26 on the inside of the sleeve, the complete radial exit of the stop pieces 18.1 to 18.4 from the helical adjustment path 14 of the Stop projection 13 enabling pockets 27.1 to 27.4, the position of which is also shown in the developments according to FIGS. 4, 6, 8 and 10 for better clarity.
  • these pockets 27.1 to 27.4 start behind the respectively assigned stop piece 18.1 to 18.4 each after an angle of rotation ⁇ 1, ⁇ 2, ⁇ 3, ⁇ 4, which is the same is the angle of rotation of the adjusting sleeve 21 between its starting position and its rotational position assigned to the respective stop piece 18.1 to 18.4.
  • the length of the pockets 27.1 to 27.4 in the direction of rotation is in each case equal to an angle of rotation ⁇ 1, ⁇ 2, ⁇ 3, ⁇ 4 which is at least equal to the angle of rotation of the adjusting sleeve 21 between its rotational position assigned to the respective stop piece 18.1 to 18.4 and its last rotational position (scale number 4), which is assigned to the last stop piece 18.5 on the helical adjustment path 14 of the stop projection 13.
  • the pocket 27.4 is now in the direction of rotation of the adjusting sleeve 21 immediately behind the fourth stop piece 18.4, which is thus still blocked, while the first three stop pieces 18.1, 18.2, 13 are released by the pockets 27.1, 27.2, 27.3 and the stop projection 13 on its adjustment path Let 14 pass until it comes to rest on the fourth stop piece 18.4.
  • the last rotation by another 30 ° gives the relationships shown in FIGS. 11 and 12.
  • the pockets 27.1 to 27.4 have released the first four stop pieces 18.1 to 18.4, but the adjusting sleeve 21 still blocks the fifth stop piece 18.5, so that this now limits the stop projection 13 on its adjustment path 14.
  • the axial dimensions of the stop pieces 18.1 to 18.5 are less than twice the pitch of the helical adjustment path 14 of the stop projection 13.
  • the pockets 27.1 to 27.4 assigned to the individual stop pieces 18.1 to 18.4 therefore overlap axially, that is to say they merge axially into one another, but this causes the blocking or release of the stop pieces 18.1 to 18.5 following one another in the course of the helical adjustment path 14 is not impaired, even if the next one in each case Under certain circumstances, the stop piece still protrudes axially into the pocket assigned to the stop piece preceding on the adjustment path 14, as is the case in FIG. 4, for example, at 30.
  • the stop pieces immediately following one another in the course of the adjustment path 14 must, however, be offset from one another in the direction of rotation of the adjusting sleeve 21, in the exemplary embodiment by approximately 30 °. However, this is no longer necessary if the axial dimension of the stop pieces 18.1 to 18.5 is only selected to be at most equal to the simple pitch of the helical adjustment path 14. This is because the stop pieces immediately following one another in the course of the adjustment path 14 can also find space axially next to one another.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jigs For Machine Tools (AREA)
  • Gripping On Spindles (AREA)

Claims (5)

  1. Ensemble de règlage de la force de serrage dans un dispositif de serrage comportant deux pièces de serrage mobiles l'une vers l'autre, un amplificateur d'effort produisant la force de serrage, et une tige filetée d'entrainement (5) actionnant l'amplificateur d'effort et guidée par le filetage intérieur d'un porte-broche, comportant pour son propre entrainement une tête de broche (6) dépassant axialement du porte-broche et une butée fixe (13'), pour laquelle est prévu un dispositif d'accrochage règlable en fonction de l'effort de serrage, en particulier pour un étau de machines avec une broche creuse à vitesse rapide (4) formant le porte-broche, la broche creuse étant mobile en rotation dans un écrou de broche relié aux éléments de serrage, et pouvant être couplée dans le sens de la rotation par l'intermédiaire d'un embrayage de couple (8,9) avec la tige filetée d'entrainement (5) disposée dans elle de façon coaxiale, caractérisé en ce que la butée fixe (13') est formée à partir d'une saillie radiale (13) à la périphérie de la tige filetée d'entrainement (5) qui lors de la rotation de la tige filetée d'entrainement (5) suit une chemin d'ajustement (14) en forme de vis de même pente que la pente du filet de la tige filetée d'entrainement (5) et se trouve alors entourée d'une douille de cage (15) coaxiale solidaire du support de broche, dans la paroi de laquelle sont formées des fenêtres de réception (17) réparties sur le chemin d'ajustement en forme de vis (14) de la saillie d'arrêt (13), dans lesquelles des éléments de butée (18.1 à 18.5) pouvant être radialement décalés sont maintenus et sont appuyés de façon ajustable à l'extérieur d'une douille de règlage (21), des cames de guidage des éléments de butée individuels (18.1 à 18.5) s'étendant sur la douille de règlage dans la direction de son ajustement, étant formées de façon à ce qu'en fonction du prérèglage de la douille de règlage, au moins un des éléments de butée s'étend radialement comme butée pour la saillie d'arrêt (13) dans son chemin d'ajustement (14) en forme de vis, et que tous les éléments de butée situés en avant sur le chemin d'ajustement (14) en forme de vis en direction de l'effort de serrage le plus faible sont rétractés par rapport au chemin d'ajustement (14) ou sont rétractables lors du passage de l'élément de butée correspondant.
  2. Dispositif selon la revendication 1, caractérisé en ce que la douille de règlage (21) est axialement fixe sur la douille de cage (15) et peut être tournée, pour le prérèglage de l'effort de serrage, d'un angle maximal de 360° à l'opposé du sens de rotation de la tige filetée d'entrainement conduisant à un l'effort de serrage plus élevé, à partir d'une position de repos dans laquelle la tige filetée d'entrainement (5) est bloquée par le contact de la saillie d'arrêt (13) sur le premier élément de butée (18.1) de son chemin d'ajustement en forme de vis (14), la douille de règlage (21) étant prérèglable à des positions en rotation prédéfinies (indices de graduation 0, 1, 2, 3,4) correspondant aux éléments de butée (18.1 à 18.5) individuels, espacées dans le sens de rotation d'une valeur angulaire (25) d'au moins l'espacement entre les éléments de butées (18.1 à 18.5), et en ce que les cames de guidage s'étendant en direction de rotation de la douille de règlage (21) présentent des ouvertures (27.1 à 27.4) aménagées du coté intérieur de la douille, permettant aux éléments de butée (18.1 a 18.5) de complètement sortir radialement du chemin d'ajustement en forme de vis (14) de la saillie d'arrêt, gui en position de sortie (position 0) de la douille de règlage (21) commencent après un certain angle de rotation α derrière l'élément de butée (18.1 à 18.5) respectif correspondant et s'étendent sur un certain angle de rotation β , cet angle de rotation α étant égal à l'angle de rotation de la douille de règlage (21) entre sa position de repos et sa position en rotation correspondant à la position en rotation de l'élément de butée correspondant, et l'angle de rotation β étant au moins égal à l'angle de rotation de la douille de règlage entre les positions en rotation qui sont affectées d'une part à l'élément de butée correspondant et d'autre part au dernier élément de butée (18.5) de la saillie d'arrêt du chemin de règlage en forme de vis (14).
  3. Dispositif selon la revendication 2, caractérisé en ce qu'un dispositif d'appui est prévu entre la douille de règlage (21) et la douille de cage (15), comportant un élément d'appui (22) chargé par un ressort sur une première douille (21), et des ouvertures d'appui (23) pour l'élément d'appui (22) de l'autre douille (21), les ouvertures d'appui (23) étant agencées de telle manière dans la direction de rotation de la douille de règlage, que l'élément d'appui (22) repose dans les positions de rotation prédéterminées de la douille de règlage qui sont (graduations 0 à 4) respectivement associées aux éléments de butée (18.1 à 18.5)
  4. Dispositif selon la revendication 2 ou 3, caractérisé en ce que les dimensions axiales des éléments de butée (18.1 à 18.4) sont inférieures au double de la pente du chemin d'ajustement en forme de vis (14) de la saillie d'arrêt (13).
  5. Dispositif selon l'une des revendications 1 à 4, caractérisé en ce que les éléments de butée (18.1 à 18.4) sont réalisés en forme de billes, et en ce que les ouvertures de réception (17) sont réalisées en forme d'alésages cylindriques, les éléments de butée (18.1 à 18.4) dépassant au maximum de la moitié du diamètre de bille dans le chemin d'ajustement en forme de vis (14) de la saillie d'arrêt (13).
EP93108265A 1992-07-14 1993-05-21 Dispositif de réglage de la force de serrage dans un dispositif de serrage en particulier pour un étau de machine-outil Expired - Lifetime EP0582792B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4223083A DE4223083A1 (de) 1992-07-14 1992-07-14 Einstelleinrichtung für die Spannkraft bei einer Spannvorrichtung, insbesondere Maschinenschraubstock
DE4223083 1992-07-14

Publications (2)

Publication Number Publication Date
EP0582792A1 EP0582792A1 (fr) 1994-02-16
EP0582792B1 true EP0582792B1 (fr) 1995-07-12

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EP93108265A Expired - Lifetime EP0582792B1 (fr) 1992-07-14 1993-05-21 Dispositif de réglage de la force de serrage dans un dispositif de serrage en particulier pour un étau de machine-outil

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DE (2) DE4223083A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100463860B1 (ko) * 2003-02-26 2005-01-03 주식회사 삼천리기계 바이스의 파악력 설정장치
KR100722957B1 (ko) 2006-06-27 2007-05-31 주식회사 에스엠씨 바이스용 다단 증력 조절장치
US8690138B2 (en) * 2010-12-29 2014-04-08 Tseh-Pei LIN Coaxial concentric double-jaw vice

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2710424A1 (de) * 1977-03-10 1978-09-14 Roehm Guenter H Spanneinrichtung, insbesondere maschinenschraubstock
DE2916179A1 (de) * 1979-04-21 1980-10-30 Roehm Guenter H Spanneinrichtung, insbesondere maschinenschraubstock

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DE59300347D1 (de) 1995-08-17
DE4223083A1 (de) 1994-01-20
EP0582792A1 (fr) 1994-02-16

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