DE8518206U1 - Drive unit for rotating shaft tools - Google Patents

Description

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Lederniann GmbH + Co. A 38 301 / beoa

ätadionstr. 2 - 2a

7240 Horb a.

21.

Drive unit for rotating shaft tools

The invention relates to a drive unit for rotating Shank tools according to the preamble of claim 1.

Drive units of this type are used in numerous machine tools, such as B. Drills, milling machines and the like. Used, they are usually fixed to the machine frame connected and essentially consist of a drive motor with a downstream transmission gear, which transfers the drive power to the machine spindle, which is rotatably mounted in the machine frame. At the A clamping device is attached to the end of the machine spindle, which is used to hold the respective Tool is used.

For clamping shank tools such as B. drills, milling or the like., Various clamping devices are known. In the case of mechanical clamping devices, the clamping force is usually achieved by means of a clamping screw, collet or applied by means of a union nut in the case of taper shank mountings. There are also stretching devices known in which the clamping force is applied by a pressure medium. In the known clamping devices is a prepositioning and locking of the tool shank to be clamped prior to initiation

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- 7 of the actual clamping pressure is not provided. | i

In the clamping devices in which the tool shank 1 is transverse to the axial direction of the by means of a clamping screw Tool is clamped against a corresponding recording, results from the one-sided clamping often an eccentric run of the shaft tool, so that

Clamping devices of this type only for rough machining ρ can be used where there are no high demands on |

Dimensional accuracy are provided. '$

Even when the tool shank is clamped with a collet, the tool has true running accuracy

hundredths of a millimeter range only through extremely clean \

possible, as even the slightest deposits on the inner surfaces of the pliers lead to eccentricities. The <cleaning of the collet before inserting the tool \

but means high temporal and thus also financial f Effort, as this cleaning work usually involves;

Must be carried out by hand and in addition to elevated '■

Personnel costs also lead to long machine downtimes.

The clamping devices that would take on the system of Kegelauf- 'i work with union nut, ensure smooth run-though mostly], but the tool change times are relatively long here since solved the union nut at each tool change and then must be re-tightened. Another disadvantage of the taper seat is that it is not possible to pre-set the tool length exactly, so that the basic setting of the machine has to be readjusted after every tool change.

The mostly hydraulisQh operated, according to the principle of Dehnspannüng working clamping devices have two

a very high concentricity, but they have the Disadvantage that the tool can loosen from the receptacle in the event of a pressure drop, which leads to injuries to the operating personnel and damage to workpieces, tools and machines. There is another disadvantage that when inserting the tool by hand, exact longitudinal positioning is not possible, because the Tool must be held in this position until the clamping pressure is applied.

Based on the last-mentioned prior art, the invention is based on the object of a drive device for rotating shaft tools, especially for precision tools, to be designed so that the tool safely positioned and locked in the tool holder even when the chuck is not clamped and against unintentional damage Loosening is secured, at the same time a quick and easy change of the tool is possible should also be the longitudinal position of the tool "

in relation to the chuck even after repeated work i

tool change be reproducible in a simple manner.

This task is achieved in a generic drive unit with the characterizing features of Claim 1 solved.

By training the drive unit with a The tool to be clamped can be positioned and locked according to the invention quickly and easily can be inserted into the chuck, whereby it is already positioned in the axial direction after insertion and is locked by the locking device, so that an unintentional release of the tool is prevented Will. In this position, the tool can be clamped, with the intended longitudinal positioning through System on an axial stop is predetermined. After a

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Another advantageous embodiment of the invention, the locking device is designed as a locking disc, which is correctly acted upon by spring force on the machine spindle is, whereby the tool is automatically pressed against the axial stop with constant spring force will. This results in a very precise longitudinal positioning and thus a high one in a simple manner Clamping accuracy of the tool in relation to the chuck is achieved, which even after repeated tool § change is reproducible and independent of the manual strength of the operating personnel.

By training the locking device as a locking device unintentional loosening of the tool from the chuck is prevented, even if the 'tool is in engagement with the workpiece and is acted upon by force. If there is a pressure drop in the chuck The chuck opens this during machining Transfer the tool to be transmitted torque safely through the form-locking device of the locking device.

The inventive design of the locking and adjusting element is particularly favorable because it requires little construction and manufacturing effort What is to be realized is what is special in view of the numerous tools belonging to a drive unit inexpensive and therefore advantageous.

According to a further advantageous embodiment of the invention, the locking and adjusting element is on the rear screwed to the tool shank, whereby the effective tool length is easily preset can be.

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Further features of the invention emerge from the claims, the description and the drawings Show exemplary embodiments of the invention and are described in more detail below - They show:

^Fi 9 · 1 shows a longitudinal section through a

Positioning and locking device of a drive unit according to the Invention; the representation zexot a tool clamped in the chuck,

^Fi 9 "· 2 the machine-side part of the

Positioning and locking device according to FIG. 1 in the untensioned state and without tools (illustration according to Fig. 1),

^Fi 9 · ³ a partially sectioned shown

Shank tool for inclusion in the positioning and locking unit according to Fig. 2 is provided,

4 to 8 further embodiments of the

Positioning and locking device according to the invention in longitudinal section (Representation according to Fig. 1),

9 to 12 different embodiments of the

tool-side design of the positioning and locking device, the tools are shown partially in section according to FIG. 3,

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13 is a perspective view

a locking disc,

Figure 14 is a top view of the lock

disk according to Fig. 13,

15 shows a section along the line XV-XV

in Fly. 14,

Figure 16 is a side view of the lock

disk according to Fig. 13.

From the drive unit known per se is in the Drawings the tool-side end of the machine spindle 9 with the positioning * and locking device arranged thereon 7, 36, which is described in detail below:

The positioning and locking device shown in the drawings 7, 36 consists essentially of a machine-side part I (Fig. 2) and a tool-side Part II (Fig. 3), which are shown in Figs. 1 and 4 to in connection with one another. On the machine side a locking device marked with 36 in the figures is provided, on the tool side there is a corresponding locking and adjusting element 7 attached, which together the positioning and locking device 7, 36 form.

Fig. 1 shows the machine receptacle 19 of a not shown Drive unit in which the driven machine spindle 9 is seated in a known manner. At the machine ^ Spindle 9 is a clamping device with screws 16 flanged in the form of a chuck 14. That in the Figures shown chuck 14 operates according to the

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Principle of tensile stress, the clamping of the tool 15 by pressurizing the chamber 21 with a Hydraulic medium takes place * The combination of the positioning and locking device with an expansion tensioning device is particularly advantageous, but in principle can be used here other chucks can also be used.

The chuck 14 serves to hold the cylindrical shaft 13 of a rotary tool 15, not shown in detail here. A recess 10 is provided between the chuck 14 and the machine spindle 9, in which a locking disk 1 is axially movable. The locking disk 1 is part of the locking device 36 arranged on the machine side; it is fastened to the chuck 14 by means of three screws 2. The screws 2 are designed as collar bolts, ie they have a head 48 which serves as a stop and which limits the movement play of the annular disk 1 in the direction of the machine spindle 9; they are fixed by means of a thread root 2 "in the chuck. The locking disk 1 is supported in the axial direction of the tool shank 13 movable, it is guided by the shaft 2 ¹ of the bolts 2. The collar bolt 2 are each surrounded by a helical spring 3, which is formed as a compression spring and which presses the locking disc 1 in the direction of the stop head 48. The springs 3 rest with one end on the chuck 14 and with their other end on the locking disc 1. They are through bores 4 in the locking disc 1 and in the chuck 14 outwards and through the shaft of the collar bolts 2 inwards.

In this embodiment (Fig. 1) is the locking disc 1 secured against rotation by means of a transverse pin 5, here a cylindrical pin 5. The straight pin 5 sits with one end in one on the outside

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the locking disc 1 extending in the axial direction of the tool Groove 8, the other end is seated in a corresponding hole in Maöchiner spindle 9.

The recess 10 in which the locking disk 1 is movably mounted / is an essentially cylindrical recess 10 in the machine spindle 9, which is on the same axis as the receiving bore of the chuck 14 for the tool 15. Towards the spindle 9, the recess 10 has a blind hole-like depression 10 'with a smaller diameter than the remaining part of the recess 10 (FIGS. 1 and 2). The diameter of this blind hole-like recess 10 'is significantly smaller than the outer diameter of the locking disk 1, but so large that it receives the ring 50 (FIG. 13) of the locking disk 1. The bottom 11 of the recess 10 'in the machine spindle 9 forms a \ hereinafter described in more detail axial stop 11 for the tool 15 °.

The locking disk 1 is floatingly mounted in the recess 10 and against the pressure of the spring 3 in the direction movable on the chuck 14. As shown in Fig. 2, the locking disc 1 is when the tool is removed 15 on the stop head 48 of the screws 2. The locking disc 1 is shown in FIGS. 13 to 16 in detail. It has essentially the shape of a disk and has a through hole 12 in its center, which on the top of the locking disc 1 (Fig. 13) of a ring collar 50 is surrounded. The outer circumference of the locking disk 1 has one in the axial direction of the disk running groove 8, which serves to hold the cylinder pin 5 as a rotation lock. About a tilt To prevent in the recess 10, the outer circumference of the locking disc is chamfered, each with a upper and lower chamfers 42, which are in the middle in one

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cylindrical bevel 41 converge. The sharpening surfaces 42 (chamfers) have one in this exemplary embodiment Angle of 15 ° to the axial direction of the disc 1, so that, as shown in Fig. 15, an approximately barrel-shaped Outer circumference results, which tapers towards the inside towards the top or bottom. As shown in Fig. 15, the locking washer 1 according to the number of screws 2 provided, in this case there are three, Bores 43 for receiving the collar bolts 2. The bores 4 close on the same axis as the bores 4 3 larger diameter, which are provided for receiving the springs 3. As shown in Figs. 14 and 15, has the locking disk 1 on the inside of the through hole 12 has two diametrically arranged grooves 44, which extend in the axial direction of the locking disk 1 over its entire height. The in Figs. 1, 2, 4 The locking disks 1 shown to 6 and 13 to 16 have two on the top of the annular collar 50 (FIG. 13) diametrically arranged cam tracks 39. The curved paths 39 run when the pane 1 is horizontal in direction A (Fig. 13) from the lowest point, beginning at a groove 44, rising upwards until it is approximately after 45 ° rotation in direction A has reached its highest point ', and then falling again to a point which is about is offset by about 90 ° in the direction of rotation A to the groove 44. From this point the orbits rise very steeply to that raised part of the annular collar 50 and b'lden stop surfaces 40. The locking disk 1 shown here is provided for a clockwise rotating machine spindle 9, with counterclockwise rotating machine spindle the course of the Curved tracks 39 can be designed in a correspondingly reversed manner, opposite to the direction of rotation A. The one shown here Locking disk 1 advantageously has two grooves 44 and correspondingly two cam tracks 39, but the number of grooves 44 and cam tracks 39 can also be greater or be smaller.

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The tool side is on the rear, towards the machine spindle 9 facing end face of the tool shank 13, a locking and adjusting element 7 is provided which, as in the exemplary embodiment according to FIG. 1 (see individual illustration in Fig. 3), consists of a threaded bolt 49 which is inserted into a corresponding threaded hole 17 in the Tool shank 13 is screwed in. At the free end of the A cross member 6 in the form of a cross pin 6 is provided for pin 49. Tool shank 13 and locking and verjj £.

Control element 7 are coaxially arranged, the axis |

of the cross pin 6 intersects the axis of the tool shaft §j

13 vertical. To secure against twisting or against | an unintentional length adjustment of the locking> and adjusting element 7 is a lock nut 18 on; Pin 49 is provided, which is countered against the end face of the tool shank 13.

For inserting the tool shank 13 into the chuck

14 and is for joining the tool-side locking and adjustment element 7 into the locking device 36 ^{i [exemplarily} shown in Fig 3, with threaded & spigot 49 and transverse pin 6 (locking and adjusting | 7). Provided the tool into the receiving bore 20 (Fig. 2) f

of the chuck 14 introduced. The ends of the cross pin | 6 pass through the grooves 44 of the locking disc \

1 to over the locking disc and to the beginning of the |

Curved tracks 39. In this position is the locking ^ ^;

washer 1 by spring force on the stop heads 48 '

of screws 2. In this position, the entire tool 15 is in the direction of rotation A (FIG. 13), i. H. opposite the normal working direction of rotation of the spindle 9 rotated by 90 °. The free ends of the cross pin run in the process 6 on the cam tracks 39. The free end of the pin 49 rests on the stop surface 11 of the machine spindle 9, so that when the tool is rotated, the locking disk 1 moves against spring force in the direction of the

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Chuck 14 moves. After about 45 ° rotation after the highest points of the cam paths 39 are reached, the locking disc 1 is again in the direction of the springs 3 on the machine spindle 9 until finally the ends of the cross pin 6 at the ends of the cam tracks 39 have arrived and are in contact with the stops 40. The positioning and locking device 7, 36 is designed in this way and arranged that in this position the locking disc 1, the stop heads 48 of the screws 2 still has not reached, so that the force of the spring elements 3 via the locking disc 1 on the cross pin 6 and thus the tool shank 13 is transferred. As a result, the free end of the pin 49 is against the axial stop 11 pressed, whereby a predeterminable longitudinal position of the tool 15 in relation to the machine spindle 9 is achieved. In this position of the tool 15, referred to below as the positioning position, this is the case Chuck 14 not yet subjected to force. The tool 15, however, positively secured against rotation by the stops 40. By training the Cam tracks 39, the positioning position of the tool is locked, d. H. only by overcoming a certain one Force to solve. It should be noted that the cam tracks 39 are advantageously designed so that when they are reached of the highest point, i.e. after rotating the tool shaft 13 by 45 °, the transverse pin 6 and thus the tool 15 is automatically rotated into its end position in which the transverse pin 6 rests against the stops 40. In this positioning position, the tool 15 is already positioned lengthways. The effective tool length is determined by the engagement of the locking and adjusting element 7 or the pin 49 on the axial stop 11. Since the The locking disk 1 engages behind the transverse pin 6 and because the transverse pin 6 is locked in this position, is an unintentional falling out of the tool 15 effectively prevented. The tool can be used consciously and

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can be deliberately released by turning it against the spring force in the opposite direction of rotation A and out of the mounting hole 20 is pulled out. After the tool change, when a tool is reinserted exactly the same longitudinal positioning is achieved again, provided that the threaded pin 49 is not adjusted took place. After the tool 15 is in the positioning position, the actual clamping process in the chuck 14 can be initiated, which is carried out in this exemplary embodiment by pressurizing the chamber 21. if If a pressure drop occurs in the chuck 14 during normal operation, the tool is still against unintentional Loosening secured, even the torque transmission can via the cross pin 6 and the stop surfaces 40 are maintained. The illustrated positioning and control device 7, 36 offers maximum operational reliability with little construction effort. The tools can be changed quickly and safely, The tool-side effort, which is usually expensive, is very low with this version, since only one threaded hole 17 must be provided in the tool shank 13 and the tools designed for this also on other machines can be tensioned.

The exact longitudinal positioning of the tool enables a tool change without the basic setting of the Having to change the machine. For this purpose, the locking and adjusting element 7 is designed to be adjustable. To The threaded pin 49 can loosen the lock nut 18 corresponding turning can be adjusted, whereby the effective tool length can be adjusted.

Fig. 4 shows a further embodiment of a positioning and locking device, on the tool side is here a locking and adjusting element 7 is provided, which corresponds in its function to that described above. at

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this version is at the lower end of the tool shaft

, 13 an external thread 23 is provided on which an adjusting nut 22 seated. The axial stop on the machine side, marked 47 here, is on the face of the chuck 14 arranged, the setting of the effective tool length is achieved by adjusting the nut 22. The shaft shoulder, identified by 24 in FIG. 4 and arranged near the upper end of the tool shank 13 24 serves to facilitate the introduction of the work ::; ug-

■ II the shaft 13 in the feed 14.

ι The embodiment shown in Fig. 5 corresponds

in its function the embodiment shown in Fig. 1, the structural change consists in the differently designed locking disc 1a and the screws 2a and the recess 10a correspondingly adapted to the locking disk 1a. As in the drawing (Fig. 5) As can be clearly seen, the stop against which the spring 3 presses the locking disk 1a is not as in FIG

j Fig. 1 by the stop heads 48, but by a

circumferential collar 46 of the locking disc 1a is formed. at With the tool 15 removed, the collar 46 comes to rest on the face of the machine spindle 9. The screws 2a are designed as stud bolts and close approximately flush with the top of the locking disc 1a.

The embodiment according to FIG. 6 is similar to that shown in FIG. 5 Execution, but here instead of coil springs 3 spring elements 3b are used, which are made of elastic, resilient material, e.g. B. rubber or plastic, exist and as a closed ring, single cylinder , or the like. Can be formed. As with the

Guide in Fig. 5 is the locking disc 1b with a ; ' circumferential collar 46 provided by the spring elements 3b against the outermost end face when the tool 15 is removed the Masrthinenspihdel 9 is pressed * The exit

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recesses 25 in the Arietierscheibe 1b and the chuck 14b are designed according to the shape of the spring elements 3b and serve to guide them,

Fig. 7 shows an embodiment in which the machine side Locking device 36c is formed integrally with the machine spindle 9c. The machine spindle 9c has a recess 10c on its end face which corresponds to the through hole 12 in FIG. On the outer circumference of this recess 10c, two diametrically arranged grooves 26 are provided, which correspond to the grooves 44 in 14 correspond. At the end of the grooves 26 there is a circumferential annular groove in the interior of the machine spindle 9c 45 provided, each of the groove 26 opposite to the normal direction of rotation of the tool on the to the tool next page so that when you turn the Tool shank 13 opposite to the working direction of rotation the end face of the adjusting and locking element is pressed against the stop surface 11 and in this Position is locked by frictional connection. The rising path in the groove 45 makes the transverse pin 6 when rotating counter to the normal working direction of rotation moves upwards, whereby the pin 49 against the axial stop 11 is pressed.

In the embodiment according to FIG. 8, too, the locking device 36d and the machine spindle 9d are formed in one piece. The recess 10d in the machine spindle 9d is essentially cylindrical, close to its interior End is a circumferential, z. B. wedge-shaped groove 29 is provided. On the tool side, there are two instead of the cross pin 6 Balls acted upon by force by a compression spring 28 are provided, which are pressed outward by the spring 28 will. The balls 27 are mounted in the head of the locking and adjusting element 7 "in a known manner so that although they can be pushed inwards, a complete

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the balls are prevented from entering the outside world. The shaft 13 of the tool 15 can be inserted here in a simple manner until the balls 27 engage in the groove 29 and the locking and adjusting element T together with the tool 15 are pressed against the axial stop 11 by the spring force of the spring 28. The transverse force exerted by the spring 28 via the balls 27 is deflected into a longitudinal force by the groove 29, as a result of which the locking and adjusting element 7 ′ is pressed against the stop surface 11.

9 to 12 show further versions of the factory |

zeugseit.igen design of the positioning and locking unit 7, 36. In the case of those shown in FIGS In embodiments, the tool shank 13a runs out on its rear side to form a pin 30 firmly connected to it, which is provided with an external thread on which two nuts 31 and 32 or 31 and 37 sit. When executing According to FIG. 9, a lock nut 31 and an adjusting nut 32 are provided, the adjusting nut 32 has two lugs 6 a near its top, which correspond to the ends of the transverse pin 6. The free end of the pin 30 is provided with a scale 33 on which the length adjustment which can be made by means of the adjusting nut 32 can be read. In this embodiment, adjusting nuts are used to fix the adjusting nut 32 32 and lock nut 31 tightened against each other. With this version, a hole must be made on the spindle side be provided in the stop surface 11, the scale pin 33 of the tool shaft 13 receives.

In the embodiment of Fig. 11 sits on the thread provided pin 30 of the tool shaft 13b an adjusting sleeve 37 with lock nut 31, near its upper end the adjusting sleeve 37 is provided with a transverse pin 6. The effective tool length is set here

I. Turning the - 21 - 37 on the thread of the _ ... ..,. ia j also through Rifle 22nd I Supplement S 30. 12 show Executions of the in • I Figs. 10 and Further

Fig. 3 shown locking and adjusting element The threaded pin 49 can, as shown in FIG. 3, also be designed as a head screw, the transverse pin 6 sits in a hole in the screw head. Fig. 10 shows an arrangement in which the cross pin 6 directly seated in the threaded pin 49. In the embodiment according to FIG. 12, the threaded pin 49 has an elongated one Head 38, near the upper end of the cross pin 6 is seated.

13 to 16 show the locking disk 1 already described with reference to FIGS. 1, 2 and 4. The one shown here and locking disks 1 described with reference to the exemplary embodiments are advantageous in plan view (Fig. 14) circular, but any other shapes are also conceivable, z. B. square or triangular. With an appropriate design of the recess 10 in the Mcschinenspindel 9 could, then z. B. on a Anti-rotation device 5 can be dispensed with. The circular locking disc shown in FIGS. 13-16 1 is particularly advantageous because its design effectively prevents tilting.

The embodiment shown with reference to FIG. 7, with the locking device 36c and machine spindle 9c are made in one piece, is only one of many embodiments, so is z. B. also one Dovetail-like counter-guide in the machine spindle 9 possible, in which the approach 7 with a cross pin is added like a bayonet.

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According to the invention is a drive unit with the Features of the preamble of claim 1 conceivable, in which a locking device 36 in the chuck is used to position and lock the shaft tool 14 is provided, in which the arranged on the shaft 13 of the tool 15 locking and adjustment ^ element 7 can be positioned and locked in a self-locking manner and against a device 7, 36 attached Axiälänschläg 11; 47 can be pressed.

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Claims (7)

..Pateat Lawyer · Ing.iVv Menzel « _{r. 4 sheets r} Ledermann GmbH + Co. A 38 301 / beoa Stadionstrasse 2 - 2a Horb a. N. 21, J. Expectations . Drive unit for rotating sheep tools with a positioning and locking device, with one attached to a machine spindle or the like Chuck and a locking and adjusting element arranged on the tool shank, characterized in that for positioning and locking the shaft tool (15) in the Machine spindle (9) a locking device (36) is provided in which the shaft (13) of the tool (15) arranged locking and adjusting element (7) can be positioned and locked in a self-locking manner and can be pressed against an axial stop (11; 47) attached to the device (7, 36). 2. Drive unit according to claim 1, characterized in that the locking device (36) has a form-locking device (40) to prevent rotation of the tool shank (13) opposite to the working direction of rotation of the machine spindle (9). 3. Drive unit according to claim 1 or 2, characterized in that the locking and adjusting element (7) on the side of the tool shank (13) and facing ^{towards the 1 machine spindle (9)} tr · · · ■ et « t · ■ · lit is arranged on the same axis as this and has a cross member (6) near its end. > 4. Drive unit according to one of claims 1 to 3, characterized in that the locking and adjusting element (7) for presetting the effective Tool length is adjustable in the axial direction of the tool shank (13). j 5. Drive unit according to one of claims 1 to 4, & characterized in that the locking and locking Adjusting element (7) from an ir the tool shank (13) screw-in threaded pin (49) consists, preferably by means of a seated Nut (18) can be determined. <r. 6. Drive unit according to one of claims 1 to 4, characterized in that the locking and adjusting element (7) consists of a firmly attached to the tool [Shank (13) connected threaded pin (30) consists, > on which an adjusting nut (32) with cross member (6) sits, which is preferably lockable by means of a further nut (31). ι 7. Drive unit according to claim 6, characterized in that at the upper end of the pin (49; 30) a length adjustment scale (33) is arranged. 8. Drive unit according to one of claims 1 to Ί, characterized in that the positioning and locking device (7, 36) is arranged between the chuck (14) and the machine spindle (9), the locking device (36) of the machine spindle (9j or the) Assigned to the chuck (14). • t ft ·· «·« * 9 * drive unit according to one of claims 1 to 8, characterized / that the locking device (36) has a locking disk (1) which is acted upon by spring force in the axial direction to the machine spindle (9) is. 10. Drive unit according to claim 9, Α-ζλ * - \\ λ · ιτ * \ λ γτ ^ TmTkYY rraA r * tViVkö.4 *. / -1 .a ft Λ · ι_ω A ν · ν · β4- · ί ^ y ο ο ^ "* ^Ä " V ^ "* ^ (1) is mounted axially displaceably in the machine spindle (9) and is supported by at least one compression spring (3) is acted upon by force in the direction of the axial stop (11; 47). 11. Drive unit according to one of claims 1 to 10, characterized in that the axial stop (11) by the adjusting and locking element (7) opposite side of the machine spindle (9) is formed. 12. Drive unit according to one of claims 9 to 11, characterized in that the locking disc (1) has at least one, the axial stop (11) opposite cam track (39) which at least a stop (40) ends (Fig. 1 to 6). 13. Drive unit according to one of claims 9 to 12, characterized in that the locking disc (1) is mounted floating and tilt-free between the machine spindle (9) and the chuck (14) and is guided by at least one bolt (2) in the axial direction of the tool shank (13). 14 drive unit according to claim 13, characterized in that the bolt (2) has a Has stop (48) which controls the movement of the locking disc (1) in the direction of the axial stop (11) limited. 15. Drive unit according to one of claims 9 to 14 / characterized in that the locking disc (1) has a recess (8) on one outer side, in which one end acts as an anti-twist device a cross pin (5) is, the other end of which 16. Drive unit according to one of claims 1 to 15, characterized in that the locking device (36) a central recess (12) with at least a groove (8) for inserting the locking and adjusting element (7) with the cross member (6) of the tool shank (13). 17. Drive unit according to claim 16, characterized in that the central recess (12) with at least one groove (8) in the locking disc (1) is provided. 18. Drive unit according to one of claims 9 to 17, characterized in that the locking disc (1a) on its side facing the tool (15) has a collar (46) which has a stop for the movement of the locking disc (1a) in the direction forms on the axial stop (11). 19. Drive unit according to one of claims 9 to 18, characterized in that the locking disc (1) has at least one recess (4, 25) which forms part of at least one spring element (3, 24). - 5 - 2Ö. Drive unit according to one of Claims 1 to 8, u ^ characterized in that the locking * and Adjusting element (7) has at least one ball (27) which is transverse to the axial direction of the tool shank (13) is spring-loaded, and that the locking device (36) through a recess (1Od) is formed with a circumferential groove (29) in the machine spindle (9d). 21. Drive unit according to one of claims 1 to 20, characterized in that an axial stop (47) is arranged on the end face of the chuck (14), and that on the outer circumference of the tool shank (13) a corresponding counter-attack (22) is provided. 22. Drive unit according to claim 21, characterized in that the counter-stop (22) is adjustably attached for longitudinal positioning and is preferably designed as an adjusting nut (22). 23. Drive unit for rotating shaft tools with a positioning and locking device, with a chuck attached to a machine spindle or the like and one attached to the tool shank arranged locking and adjusting element, characterized in that for positioning and locking the shaft tool (15), a locking device (36) is provided in the chuck (14) is, in which the locking and adjusting element arranged on the shaft (13) of the tool (15) (7) can be positioned and locked in a self-locking manner and against one on the device (7, 36) attached axial stop (11; 47) can be pressed. -6-