DE1477348A1 - Machine tool - Google Patents

Description

Dr. A. ^ DipL-lng. W. L'w.u

Patent attorneys

Refrath near Cologne

london 137

Refrath near Cologne, February 17, 1964

Dr. Expl.

Giddings & Lewis Machine! Tool Company, Fond du Iac, Wisconsin, USA

Y / β r k ζ e u g m a a oh in ».

The present application is in the field of "tool machines". In particular, it relates to a new subordinate support mechanism, such as is particularly, but not limited to, horizontal drilling and other uses bark.

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H77348

Machines of this type often have a headstock an extendable, mechanically driven plane spindle with a sliding support element, which is called Unterana. The forearm can be displaced parallel and synchronously to the spindle and acts as an external support for the IT indicator, accessories or the like to be attached to the headstock. Such Machines are, for example, described in the USl .. patent documents No. 2 890 629 and No. 2 984 159 illustrated and described * !.

With other machine feet, the sliding support element can be used as a tool-bearing independent of the spindle Use stab'sael for finishing and planing work. At still the sliding support is actually used for other machines for receiving a spindle which is arranged approximately concentrically to it. The one used in the present description The term "forearm" is intended to mean all possible, sliding support elements, regardless of whether they are kind of a spindle or are arranged under a spindle, cover.

A forearm is usually designed as a relatively stiff, box-like construction with a considerable cross-sectional area. However, when it is extended from the headstock or another support, it behaves as a cantilever and experiences a certain deflection, which affects the accuracy of the IiIBB chine. The deflection increases proportionally with the length with which the lower beam is extended from the headstock. The extended length can be, for example

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BATH ORIGINAL

wise between ο- 1.5 m. The deflection of the lower part is a result of its own weight per unit of length, as well as the external stresses caused by the weight of the tool or the like, which is attached to the outer end of the lower part. Another factor that: ur Duichbi e £ ung des Contributing to the forearm is the distortion of one or more elements of the I.iaschinenr & huens, or of those connecting these Bleoente Guided tours due to the weight, or the position of the weight of the sub-office.

Accordingly, the present invention is intended to create a sub-support mechanism for a machine tool *} which the deflection of the forearm as a result of one Own weight, or the weight «of the work. "Eye", accessories " or the like. which is located on the outside of the "forearms", or as a result of the delay in one or more associated Sletüente des Mas chin narrow parts, fully compensated.

In addition, a forearm retrieval mechanism of the type shown is to be created by the invention, which is suitable for automatic and continuous compensation of the deflection of the forearm when the lower arm is retracted before o do τ , the compensation within the range of motion of the forearm independent of the amount of the overhang should be possible so that the bottom a »remains essentially horizontal.

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ought = to be created in Unteranasurportci ach ani sinus of the type shown, in which the compensation of the lint era imdurclibi 9 £ ung can be adjusted at will in order to accommodate different items , accessories cdgl. which is attached to the lower ax.

In addition, a forearm support mechanism is intended to be the one shown ; .rt to be created, which is a novel arrangement more suitable for generating internal counterbalancing forces Gross 8, which has a sagging of the under-name in prevent its entire range of displacement.

The invention is based on the following specific description and explain the drawing.

Ss shows:

. 1 the perspective view of an example Horizontal drilling and milling with mark i of the present invention,

? ig. Figure 2 is a fragmentary perspective view of the machine tool sub-support mechanism after Pig. 1 on a large scale,

Tig. 21 is a fragmentary, perspective detailed view of an internal cell of the adjusting device arranged in the interconnection;

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Fig. 3 is a piece of cloth, perpendicular to section

you raw the inner part of the forearm and the Headstock, the Te rkzeugaas chine in nooh larger scale,

Fig. 4 A and

Bruehs treacherous, vertical longitudinal cuts you raw

the inner area of the forearm in nooh bigger scale,

Tig. 5 shows a cross section through the lower part 5-5 of Fig. 4 A,

Fig. 6 is a cross section along 6-6 of Fig. 4B,

7 shows the detailed view of a. Cam disk for creation and a scale disk dl ·, as from Fig. 4 B can be seen on the outer bath de « Forearm are attached,

Fig. 3 is a shamatic representation of the forearm in two possible, extended positions * ..

Although various modifications and alternative designs are required in the present invention, an example of implementation is shown in the drawing and is described in detail below, but the present invention is not intended to apply to the specific, disclosed i / execution foai be restricted, but in

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H773A8

Opposite of all.? Modifications, alternative versions -nc. Equival arts within the scope of the invention.

The general design of the machine tool).

As from the drawing and especially from Pig. 1 sees Lion, a heavy horizontal boring and preswerking Io has been chosen as the execution example of the present invention, the general design of which is known in specialist circles. In the present case, the machine tool has a bed 12 with three longitudinal guides! 14. On the guides 14, a vertical stand l6, arranged in a straight line with a stand element, is displaceable in the longitudinal direction of the bed. The stand carries a spindle stock ΐδ, which is arranged vertically displaceably on the rails 20 of the stand 16 The headstock 18 carries a horizontal spindle 26 which can be rotated and displaced in an axis parallel to the bed 12 by being moved forwards or backwards from the headstock 18 parts are said is placed tstüokeupport workpiece to be processed next to the spindle on a suitable, not shown We ^ on the ^"n A.rbeitsseite of the machine tool.

909841/0471 ₇

BATH ORIGINAL "" '"

U773A8

The remote tool machine Io has an extendable forearm Jo, which slidable in the locker "! floor 18 below and parallel to, Spindle 26 is mounted. The forearm and the spindle are Simultaneously movable in the axial direction to meet the requirements to be avenged of any operation, νιο a moving support for the spindle in the Unteram and the associated tools, accessories or the like. represents. In the present case there is a on the outer bath of the forearm S pi η del support 32 attached, which is the side of the spindle absorbs and supports. The spindle has a suitable input "

direction for attaching a tool and the lupport is designed so that the spindle and d & e V / generate so that it can be guided through him in the axial direction are that they protrude from its outer bath.

According to the present invention, the machine Io and the Forearm 3o a new & nti- deflection direction, which is capable of fully compensating for the deflection of the forearm over its entire range of motion. J This problem is solved by a mechanism, the corresponding exercises internal forces of sufficient magnitude, about a deflection of the forearm as a result of an or η-3hrarer represent the following factors to counteract: (1) Si ^ sn ^ awicht, (2) weight of the can outer end attached 7 / equipment, accessories or the like and (3) delay of one or several parts of the machine frame. This gives the The spindle in its extended positions provides additional rigidity, which increases the accuracy and precision of the lerkzougcias'jhine iWes. ^ to be improved daily.

90984 1/047 1 _BAD oB \ G »NA ^ - 8 -

The general education of the Unteraxmes.

Before interacting with the Unteramt} o ζ usamu en Jonti- Äürohbiegungsmechanisuus will be described in detail the general constructional features of the forearm, its storage and its drive, representing a example Auqführungsfoun of such a device to umreiosai, it is useful. ¥ ie from the? Ig. 2, 3, 5 and 6, the forearm in the present case bysteams from a hollow, rectangular structure, which is made of an upper plate 34 and a lower plate 35 of a relatively heavy design and opposite, somewhat light-textured on the side 56 is formed, 37 "the side bar" may be connected to the plates, so ^de> S3 forearm is limited to its full Apissenflaehe tone verhältniaaässig smooth walls for example by Sohweissnähte 3, or in any other appropriate manner. Since you are raw, the precise guidance and support of the forearm in the headstock is made easier. The Unteraim slidably supported on bearing surfaces that are provided in the headstock for all his four Seitm, The bearing surfaces are formed ao, is that minimum play for the Bot gives ran. On the outer or circumferential surfaces of the forearm, how? 3, wedge-shaped discs can be seen. 4o provided, which are adjustable to generate a suitable game for a tight sliding seat.

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H77348

In dam headstock l8 an engine is arranged to both the spindle 26 and the Unteraxm} o upstream and zurüokzufahren. In the present case, the drive for the spindle and the drive for the Uhterana are at the same time «! Actuation of the two components is dependent on one another, although drives that are independent of one another can also be provided if this appears advantageous. 3, parallel drive spindles 41 and 43 , which are driven by the headstock gear, are provided for displacing the spindle and the forearm. M.

A drive nut 45 is attached to the spindle 26, which sits on the screw shaft 41, so that a rotation of the screw spindle 41 feeds the nut 4 $ causes the work spindle, depending on the direction of rotation the screw spindle 41, as indicated in panel 5, to the left or to the right. Sitting in a corresponding manner on the screw spindle 43 a dead drive nut 47, which en the upper plate 34 of the lower army 5o is attached, see that a rotation of the screw spindle 43, as shown in Fig. 3 * - visibly, a shift of the ünteraaaes to the left or right causes. The thread pitch of the screw spindles 41 and 43 is chosen so that the Vereohiebuag of the work spindle and Unterana, if the spindles are driven by the drive device not shown; «is coordinated and takes place at the same time, whereby a continuous support of the work spindle, regardless of their relative position development ζφη headstock geschaf tm "

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The anti-deflection mechanism.

In accordance with the present invention, so is the Unteraim designed and executed that it has the deflection or sag in its entire displacement range as a result of this Eijangewijhtas, or the one that acts on the new external code Weight of tools, accessories or the like. or as a result of the delay in one or more parts of the LIa sch in en rahm gps fully compensated. This is achieved by a device that has the corresponding internal forces in the sub & in the ent winds, we counteract the deflection caused by One or more of the factors shown can be brought about would. In the present case, this means “facility aut an antidirectional mechanism, which, like JMg. 2, 4 A, 4 B and & can be seen within the sub-area 50 is arranged and is functionally coupled with dl * s «m.

The iinti-deflection mechanism consists of a Lompensatorbalkeii, which by a pair in lateral distance. arranged to one another, standing on edge «. Webs 55 _t 56 formed v / i rd, within the sub-Annes, in Längsiichtang thereof extend, are arranged *. The upright flanges 55, 56 are connected to the side * by means of transverse webs 57, which are fastened with the help of screws 59 for games. Kept distance *

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BATH ORIGINAL

- Xjl -

After the present 3 rf in the training becomes the lLompmsatorbar tense within the forearm and relative to it, creating compensating reaction forces of a certain size to be established in the sub-office. The regulated tension of the beam 53, in the present case, a novel arrangement of the ball is achieved within the forearm, whereby a lever curvature is generated between the beam and the lower body, with the contact between the two 3a. ut-i lan in three spaced, vertical ab es he follows. This jJbanen sina in Figs. 4 A, 4 B and 8 duroh *

the je rad en I, II and III indicated, with the touch between the two components is such that all forces and reaction forces occurring between the beam and forearm occur roughly in these perpendicular planes. In the present If satisfactory results are obtained by B ^ ührunjpunkte between the beam and forearm near the Ends of the lower it and at, or near the ends of the beam can be provided with a pivot point between the two points mentioned above is provided, but j

is arranged ausseien.ttig to achieve a mechanical advantage.

For the connection of the extended dead weight of the forearm in its said displacement range, continuous readjustment of the tension of the beam 53 depending on the extension or retraction process of the Unteraxmes taken care of. For this reason there is a guide cam device 58 arranged in the longitudinal direction

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H77348

(see 7 * ig. 2,3,4A and ^) provided, di-i at the inner endö Untert * riii «# fc5 '-ju una ujü Ei.jKv.ris> j ti el -cen i; 3t. In the present case from * st -Jit the guideBkurveneini'iohtuni; from a steering wheel attached to the underside «! ement and one with the beam 53 connected! on guide curve.

Uis in particular from fig. 2 and 4 A, the inner or, in the drawings, the right bide dee lower part is equipped with a storage frame for a control panel following the guide curve, which has parallel side plates, the windy on the sides 36 and 37 den Unteraxmee m are fitted. The plates 60 are connected to one another by a flanged base plate 62 which is fastened to the end of the plate 35 by means of screws 64. Lxaamr this is the bearing frame by means of its L-shaped head plate 66 with the help of screw! 68 rigidly connected to component J4 of the forearm. The side plate 60 serve to an upper verschwsnkbaron storage, FtUilungsfcurv »W following control element 70, which is supported on a horizontal bearing pin 72 extending between the side plate. The control relay 70 is formed by an angle lever 74 which carries a roller 76 at its protruding end on a pin 78. At the other end, the angle lever has a pair of downwardly pointing fingers 80.The latter are located in the 3-level marked III in printed arrangement with the corresponding pair of flat contact surfaces 83, which are at the right end of the bar 53 in the sense of the drawing. The V. ^r inkelh? Bel 74 has at its charging, right

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End of a lever arm or a radial length, ie β by a multiple is greater than that of the fingers 83, whereby the force which is transferred from the roller 76 to the fingers 83, itself multiplied.

In the plan CHPL at ze 62 is a second, the "Pührungakurve following element in the form of a blind 85, v / AlChE in the '7 ei se on a pin 87 is arranged so that the axes of the rollers 76 and 85 only in a The second element in the form of the roller 85 only represents a running diden support for the guide curve 9o arranged in the longitudinal direction, which actuates the control element 70.

The longitudinal FÜferungdturve 9o is on one End attached to the headstock. It is traversed by the control element 70 when the forearm is displaced. The slope of the guide curve 9o is mathematical Calculated in a little way, that there are counter-voltages across the beam 53 in the lower.im which the deflection as a result the weight of the subartia related to the unit of length compensatory when this is extended. Because the weight of the extended tuiles of the forearm is linearly proportional to the extended length, the slope becomes the guiding £ fcurve 9o et v / a constant or linear.

- 14 -909841/0471

To compensate for the deflection of the lower part as a result from delay of one or more parts of the machine frame, welcfa · carry the forearm, the guide curve 9 ° is equipped with a device that allows the adjustment of its incline "Such a setting is permitted" on U & schine zu Machine, as a result of small fluctuations in the size of the debris, e.g. the machine bearing and the guide play, may be different. As a result of such an attitude or Compensation of the »guide curve running in the longitudinal direction one receives in the forearm over the compensator beam 53 one entgee narrowly considered deflection.

As shown in FIGS. 2, 4 A and 4 B, b "stands 11" in Longitudinal guide β chi tue 90 made of two get resin components that can be adjusted relative to one another. One serves both components, a Ortin del em ent 91 is on one fixed wall 95 attached. A-Is fixed can zv / ekdsmäßig prove the back wall of the housing of the headstock it l8 can be chosen. The örundaLaaent 91 is articulated at 95 stored so that it can experience a distortion of a few repentant degrees. The floor area 97 of the a-round em good is finely machined and hardened and lies on the Bolle 85 on. D & 3 o-round 3u.ent 91 has, as in particular from Fig. 2, 2 A and 5 can be seen, at 99 a channel in the sense of the drawings from the left end of the O-round element to is led to a point near the right end of the same. The channel 99 is made up of several, in the present case

Trap 5 hardened pins crossed between legs

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SAD ORIQiNAL

H77348

Io2, which flank the canal in the longitudinal direction. The second, or upper component Io4 of the one extending in the longitudinal direction Guide curve 9o is a relatively long one Curve bar, which the reason! anent 91 and relatively to demselbai is adjustable.

Di 2 curve τ. stange Io4 is right on the * i Ü5ide a «V first eil very au !.

loo, di - on her as Ko ^ .f Io7 v-rdrsht v / can ground. The robbery Ιού canoe can be used to follow the curve 31 rod Io4

to shift right or left *, vrobai the screw itself, *

as with loS, because movement is prevented axially. On the Grundelonent 9I is located near the end of the Curve bar Io4 and the screw I06 to facilitate the Settings on a scale of I09. The curve range Io4 has several Nuton, di e from right to lefta with Ho, 111, 112, 113 and 114 are numbered, each groove takes a trapezoidal shape Klotz lic, 117, 118, 119 and 12o on. Every block is in its groove in a suitable T7eisa, for example aLsweis e with the help of

3 egg; rob 121 in the ".7eise attached that part of each j

The block protrudes from the curve of the rod Io4. Everyone who The areas protrude from the Io4 curve bar and form “ine” inclined guide surfaces that have a fink.il of less than 9o ° with the horizontal. Each of these watch surfaces Ii ggt, ν.'β ^ η the two parts of the "Paha * urve 9o Assembled aLnd, a pen loo geeenüber, on weloh «m it slides when the two parts are displaced relative to each other will. The angles of the inclined filler surfaces that begin with

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H77348

123, 124 ₁ 125, 126 and 127 numbered, are of right, "so that therefore the slope of the surface in comparison to that of the surface * verhältnismiLesig gently to the left large 127th

It can thus be seen that the inclined surfaces 123 slide one after the other on their associated pins loo arranged in the channel 99 of the base element when the guide rod Io4 is displaced relative to the base element 99. This makes spreading of the guide rod Io4 relative to Qrundeleraent 91 caused, the amount of

in

Spreading progressively in the direction of the outer fei de the longitudinal direction running guide * urv «9o zuimat. This gets a predetermined slope of the guide rod * Io4 and its upper surface on which the guide roller 76 dee Control lever rolls. The control lever 7o let ao. arranged ,, da ·· he Yöränaarungen the height of the guide curve 9o in the Sbene of Bd 11 en 76, 85 perception, with the amount by previous Adjustment of the upper part of the guide curve relative to the lower part is changeable.

In * lg. 8 the compensation effect of the present sub-span structure can be seen more clearly. Let it be assumed that the initial setting of the belative position of the guide rod Io4 to the arundel anent 91 has taken place by turning the adjusting screw I06, so that the upper surface has a predetermined slope. If now the Unteram after is extended to the left, the bolts 76 and 85 move

909841/0471

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U77348

along the other side of the guide curve mechanism. As a result of the preselected slope, which leads to an increasing spreading of the surfaces 97 and 129, the studs are also spread or moved apart 7o transferred, which tries to rotate around the bearing pin and thereby presses the fingers 8o against the contact surfaces 85 of the compensator bar 55. The force exerted on the contact surface 85 which, as mentioned, is located at the end of the beam 55, tries to twist the beam around its central articulation point, numbered 155 in FIG. 4B, which acts as a fulcrum. In the present case, the laking 155 consists of two aligned transverse pins 157 and corresponding bearings in which the bar 55 can rotate sioh. The downward-acting force exerted on the surface tries to twist the Balkan 55 i ^ clockwise around the pins 157, τ / ο through the left end of the bar 551, which is connected to the forearm from the end of the forearm Above £ 3 directed force is exerted.

The Kom ^ 3nsatorbe.lken 55 acts as a result of its arrangement inside the forearm as a force multiplier lever that in dsrNähvi de3 outer south of the forearm an enlarged, also exerts a force directed above, which the no times mentioned as a result of the weight of the forearm,

909841/0471 - 18 -

or the yo iz uges wear aider parts of the hash in frame baim Jyuefahren the Unterames occurring sagging odor Counteracts deflection.

When the forearm is extended, the roller 76 is pushed upwards by the incline of the surface 129, as a result of which the lever 70 is rotated about the pin 72, so that the force directed towards the bottom on the contact surface 85 of the beam is enlarged. 7cjin the forearm is extended, the inside grows, at the end of the forearm itnti-duroh bending force is generated proportionally, so that a stable horizontal position is maintained in the forearm. If the compensation turns out to be too large or too small when the lower ascension is extended to eliminate a deflection due to the deformation of the frame parts of the machine, a correction can be carried out by adjusting the screw Io7, which P. relative position of the Tühruxgsstange Io4 to the basic element and thus the slope of the surface 129 and the size of the resulting force transmitted to the compensator beam and the lower part is changed.

According to the present invention, there is also a device for compensating for extraordinary loads as a result of T / ariizeuggn, Zub-iLOr or the like. which at the Untem-im attached v / ird and additional bending or sagging Causes lowering, provided. In the present case ^. approx the iiompgnsation is achieved by a manually adjustable compensation device, the outer end of the beam 53 is gelggen and serves to establish the position; who has the power

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transmitting connection and thus the amount of the deflection undo "oh s aid counterforce, which is on the Bn de dea forearm tibet contract m to varändöin.

In FIGS. 4, _1, 6 and 7, for example, a related loiapÄization device 145 is shown. Urn sufficient space for mounting the Kampensati device ons 145 in the form of a cam to be created en, the left bath of E & lkons from ^^ p rt, rodurch a flat surface 147 on ζ Èðèíà of the webs 55 and 56 zv for recording / »ier racks for guide rollers that are attached to the webs by screws 150. Each frame carries a guide roller 152, the. is mounted on a pin 154 and each guide roller acts on a polygonal fouled guide which is in one piece with an actuating element 156, the actuating elements being mounted in the sides of the lower axis. The 2 Stell-ianente have a suitable pin, for a Sciiraubanachlüssal or another corresponding Stellweikzäug. In the front. on the trap are two identical ones, in axial I.

Direction spaced apart adjusting elements provided with five guide surfaces. However, BB may be any suitable ά ne. β rs el 1 unifying number 7 * ühruncsf laughing be provided without the Srf inuungsgedanke verlass m. Each of the pairs of ringing surfaces numbered 1 ^ 8, 159, loo, 161 and 102 has a different, radial, vtstxind from the l'i, central point 164 of the adjusting elements l £ b. Each? Uh tion sf lkch at some or the like is specifically designed to compensate for the weight of a particular V / erkzeuges, accessories. which can be attached to the forearm,

909841/0471

g ef ο red.

The adjustment of the position lament θ 156 can be facilitated by a concentric scale disk 103, which surrounds and is attached to the end of an actuating element provided with pins every tool or accessory used on the machine for grazing is baechriftet. If, for example, a Trüsgang with a 225 kp heavy F ms device is to be carried out on the forearm, the Stell el ein «nt 156 by hand around its axis 164 from the only with; ^M Uhteraim "b as ch ri it et en position be rotated until abuts roll the füh approximately" in corresponding fühiungsflächenpaar, eg 158, the Führungeflüohenpaar ". Thereby, the position of the force between Kompensatoxto & lk 's 53 and the tuseeren 3 £ db * Thus the amount of corrosion force transmitted from the bar to the end of the forearm is increased sufficiently to account for the additional deflection due to the weight of the milling device to cancel.

The deflection-compensated forearm disclosed in the present description can also be used in other machines uit and without headstock or spindle and regardless of whether the Untaraim offset from the spindle or coaxially to the same is arranged to be used.

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Claims (1)

T4773A8 Patent claims 1) Machine tool with an em at wa rigid machine frame and einaa in Langsrich, un ^; between a retracted and extended position movably mounted in the machine frame, depending on the degree of extension, forearm protruding from the machine frame, at the cantilevered outer end of the forearm provided * El pensions to support a cutting device with a with the lower for the purpose of its longitudinal displacement from s a ar retracted into its extended, cantilevered position, as well as in the reverse Alchtujaa ^ iusaanmeinffektaaden feed device, characterized g «that it counteracts the force of gravity, interacts with the Un tararm (} o) and this near its outer, when extending after, a On the protruding end, a vertical «lifting force» giving device (5o) t is open, the lifting force increasing or decreasing depending on the lengthwise extension or retraction of the forearm, which results in a vertical movement of the figure 3 en lindes of the forearm at Zun ehme or decrease the force of gravity acting on the protruding part of the forearm when extending and retracting the lower arm is avoided. - 22 -909841/0471 BATH - Ο ") - 2. «Terkzeugtiaschin *? according to claim 1, characterized in that that the device counteracting gravity (5o) a relative to the Unteraun (3o) movable, and when applying the upward lifting force on the out sere end of the sub-name under a boetiuute tension Element (53) for generating the lifting force and an actuation device (.58) includes that when extending. and moving the forearm (3o) back to enlarge it or reduction of the hoisting craft generating voltage in the element (53) and for serving Movements of the element (53) which correspond to an application 0C8 # n and Reduction of the tension in the SLement (53) * le J sequence «in ·« Increase and decrease in the amount given to the owner (53) counteract the tension generating the lifting force the element (53) acts. 3. '. Machine tool according to claim 2, characterized in that Ia ^ s the element (53) is a lever that moves when the forearm (3c) moves up and down, extends approximately parallel to the forearm and extends outwards outer end of the forearm (3o) the lifting force in the 'Jeise results that the ax construction of 3p3nrrang <= n in the larger part of the protruding part of the lower arm than owing to the effect of the device counteracting the force of gravity (5o), which the outer end of the lower area gives the lifting force, is avoided 909841/0471 -23- - BATH U77348 4 »7erkzeugmaachine after. 4oispruab. 2 or 5 «characterized in that the actuating device (58) for the Bltrnent (53) a guide cam (90) and a control lever (74, 76), which are when driving and driving back of the forearm (3o) for the purpose of enlarging or reducing the tension in the dementia causing the lifting force (55) move relative to each other. according to claim. 4, characterized in that some adjustment device (I00-I27) for adjustment ™ the leadership*. Urve (9c) provided is which the Auamaas of the increase or decrease in those producing the lift truck power Voltage in BL em ent (53) when * extending and retracting of the forearm changed » 6. Machine tool according to claims 2-5, characterized in that an adjustable device (145) is ▼ digestion, which the element (55) is an adjustable Preload granted, whereby the preload becomes that the tension causing the lifting force is added, wi ohe the element (55) by the actuating device (58) is granted. 7. Machine tool according to claims 1-6, characterized in that the outer Aide dee Unt-eraxmee (3o) below an extendable working spindle (26) which is a part the tool machine is. »09841/0471 BATH