JPS6215043A - Driving unit for tool with rotating shank - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial field of application] The present invention comprises a positioning and locking device, a chuck fixed to a machine spindle, etc., and a locking and adjusting element provided on a tool shank. , relates to a drive unit for a rotating shank tool.

[Conventional technology]

Drive units of this type are used in a large number of machine tools, such as, for example, drilling machines, milling machines, etc. This drive unit is mostly fixedly connected to the machine bed and essentially consists of a drive motor followed by a transmission. This transmission transmits the drive power to a machine spindle rotatably mounted on the machine bed. A clamping device is fastened to the end of the machine spindle, which serves to accommodate the tools used in each case.

Various lamp devices are known for clamping shank tools, such as drills, milling cutters, etc. In the case of mechanical clamping devices, the clamping force is generally applied by a clamping bolt or clamping tongs or, in the case of a tapered shank receptacle, by a cap nut. Furthermore, strain type clamping devices are known.

In this case, the clamping force is applied by a pressure medium.

In the case of known clamping devices, the prepositioning and locking of the tool shank to be clamped does not take place before applying the actual clamping pressure.

In the case of clamping devices in which the tool shank is clamped transversely to the axial direction of the tool by means of a tightening bolt in a receptacle, eccentric rotation of the shank-equipped tool often occurs due to one-sided tightening.

Therefore, this type of clamping device can only be used for rough machining that does not require high dimensional accuracy.

Even when clamping the tool shank with clamping tongs, dimensional accuracy of the tool in the range of 1/100+am is only possible by keeping it very clean. This is because very small deposits on the inner surface of the tongs lead to eccentricity. However, cleaning the clamp tongs before mounting the tool is time consuming and therefore economically costly. This is because this cleaning operation generally has to be carried out by hand and requires long machine downtimes in addition to high labor costs. - The clamping device, which operates according to the arrangement of the tapered receptacle with a cap nut, guarantees exact rotational accuracy, but the cap nut must be removed and retightened each time the tool is changed. Another disadvantage of tapered housings is that precise length pre-adjustment of the tool is not possible. Therefore, after each tool change, it is necessary to perform a new basic adjustment of the machine.

Hydraulic clamping devices operating on the principle of strain clamping have a very high rotational precision, but have the disadvantage that the tool can come out of the receptacle when the pressure drops. This can cause injury to the operator and damage to workpieces, tools and machinery. Another disadvantage is that when manually inserting the tool, precise longitudinal positioning is not possible since the tool must be held in position until clamping pressure is applied.

[Purpose of the invention]

The object of the invention is, starting from the prior art described above, to form a drive unit for a rotating shank tool, in particular a precision tool, as follows. That is, even when the chuck is in an unclamped state, the tool can be reliably positioned and locked within the tool housing and held against accidental release, and at the same time the tool can be replaced quickly and easily. Furthermore, the drive unit should be designed in such a way that the longitudinal position of the tool relative to the chuck is easily reproducible even after a number of tool changes.

[Structure of the invention]

The problem is that in drive units of the type mentioned at the outset, a locking device is provided for positioning and locking a tool with a shank in the machine spindle, and a locking and adjusting element on the shank of the tool is provided. is solved by being positionable and lockable in a self-locking manner in the locking device and pressable against an axial stop mounted on the device.

〔Effect of the invention〕

Because the drive unit is equipped with the positioning and locking device according to the invention, the tool to be clamped can be quickly and easily mounted on the chuck. In this case, the tool is positioned in the axial direction after mounting and is locked by the locking device, so that the tool will not come off unexpectedly. The tool can be clamped in this state. In this case, the longitudinal position is predetermined by resting on an axial stop. In another preferred embodiment of the invention,
Since the locking device is designed as a locking disc and is biased by a spring towards the machine spindle, the tool is automatically pressed against the axial stop by the same spring force. Thereby, a very precise longitudinal positioning and therefore a high clamping precision of the tool with respect to the chuck is easily achieved, which clamping precision is reproducible even after many tool changes, and which allows the operator to reduce the hand power Not dependent.

By configuring the locking device as a complementary holding element, it is ensured that the tool cannot be unintentionally removed from the chuck even when the tool is biased against the workpiece. When the pressure in the chuck decreases during machining, the torque to be transmitted from the chuck to the tool is reliably transmitted by the complementary retention of the locking device.

It is very advantageous if the locking and adjusting element is formed according to the invention. This is because it can be formed with low structural and manufacturing costs. This is very advantageous in terms of cost and is therefore very convenient, considering that a large number of tools belong to one drive unit.

In another preferred embodiment of the invention, the locking and adjusting element is screwed onto the back of the tool shank. Therefore, the effective length of the tool can be easily adjusted in advance.

〔Example〕

Other features of the invention are apparent from the claims, the following description and the drawings. Embodiments of the present invention shown in the figures will be described in detail below.

The figure shows the tool-side end of a machine spindle 9 with a positioning and locking device 7.36 of a known drive unit. Next, this positioning and locking device will be explained in detail.

The positioning and locking device 7.36 shown in the figure essentially consists of a part I on the machine side (Fig. 2) and a part II on the tool side (Fig. 3).
It consists of These parts are shown connected to each other in FIG. 1 and FIGS. 4-8. The machine side is provided with a locking device, designated 36 in the figure. A corresponding locking and adjusting element 7 is mounted on the tool side. This locking device and the locking and adjusting element together form a positioning and locking device 7.36.

FIG. 1 shows a mechanical housing part 1 of a drive unit (not shown).
9 is shown. A driven mechanical spindle 9 is mounted in this mechanical housing in a known manner. A clamping device in the form of a chuck 14 is flanged onto the machine spindle 9 by bolts 16 . The chuck 14 shown operates on the principle of a strain clamp.

In this case, the clamping of the tool 15 takes place by pressurizing the chamber 21 with a hydraulic medium. Although the combination of a positioning and locking device and a strain clamping device is very advantageous, other chucks can in principle be used.

The chuck 14 serves to accommodate a cylindrical shank 13 of a rotary tool 15, which is not shown in detail here. A recess lO is provided between the chuck 14 and the machine spindle 9. A locking disc I is mounted in this recess so as to be axially movable. The locking disk 1 is a part of a locking device 36 provided on the machine side, and is fixed to the chuck 14 with three bolts 2. bolt 2
It is formed as a flanged bolt. That is, the bolt 2 has a head 48 that acts as a stopper.

This head 48 limits the play of the movement of the annular disc I in the direction of the machine spindle 9. Bolt 2 has a threaded bottom 2″
is fixed to the chuck by The locking disc l is mounted so as to be movable in the axial direction of the tool shank 13 and is guided by the yank 2' of the flanged bolt 2. Each flanged bolt 2 is surrounded by a coil spring 3. This helical spring is designed as a compression spring and presses the locking disc 1 towards the abutment 48 . One end of the spring 3 is in contact with the chuck 14 and the other end is in contact with the locking disc 1. The spring 3 is guided on the outside by the locking disc 1 and the hole 4 of the chuck 14, and on the inside by the shank of the flanged bolt 2.

In this embodiment (FIG. 1), the locking disc l is connected to the transverse pin 5.
, here held by a cylindrical pin 5 so as not to rotate. One end of the cylindrical pin 5 is fitted in a groove 8 extending in the axial direction of the tool on the outer surface of the locking disc l, and the other end is fitted in a corresponding hole in the machine spindle 9.

The recess lO in which the locking disc l is movably supported is an approximately cylindrical recess lO of the machine spindle 9.

This recess is provided coaxially with the receiving hole of the chuck 14 for the tool 15. The recess 10 is on the side of the spindle 9,
It is provided with a blind hole-shaped depression lO'.

The diameter of this recess is smaller than the rest of the recess 10 (FIG. 1.2). The diameter of the blind hole-shaped recess 10' is much smaller than the outer diameter of the locking disc I, but is large enough to accommodate the ring 50 (FIG. 13) of the locking disc 1. Bottom 11 of recess 10' of machine spindle 9
forms an axial stop ll for the tool 15, which will be explained in more detail below.

The locking disc 1 is supported floatingly in the recess 10 and can be moved towards the chuck 14 against the biasing force of the spring 3 7 As shown in FIG. When removed, it comes into contact with the abutment 48 of the bolt 2.

The locking disc 1 is shown in detail in FIGS. 13-16.

The locking disc is approximately disk-shaped and is provided with a through hole 12 in its center. This through hole is surrounded by an annular collar 50 on the upper side of the locking disc I (FIG. 13). The outer circumferential surface of the locking disc l is provided with a groove 8 extending in the axial direction of the disc.

This groove serves to accommodate the cylindrical pin 5 as a rotation preventing member. In order to prevent the locking disc from tilting in the recess 1 (10), the outer circumferential surface of the locking disc is chamfered, forming an upper and a lower chamfer 42, respectively. They intersect at the center of the chamfered portion 41.

In this embodiment, the inclined surface 42 (chamfered portion) forms an angle of 15 degrees with respect to the axial direction of the disk l. Therefore, as shown in FIG. 15, a substantially barrel-shaped outer circumferential surface is formed that is inclined inward on the upper or lower side. As shown in FIG. 15, the locking disc 1 is provided with holes 43 for accommodating the same number of flanged bolts 2 as there are bolts 2, in this example three. A large diameter hole 4 for accommodating the spring 3 is coaxially connected to this hole 43 . As shown in FIGS. 14 and 15, the locking disc l is provided with two diametrical grooves 44 on the inner surface of the through hole 12. As shown in FIGS. This groove extends in the axial direction of the locking disc I over its entire height. Figure 1.2, Figures 4-6 and Figure 13
The locking disc l shown in Figures 1 to 16 has an annular collar 50.
The upper surface (FIG. 13) is provided with two diametrically arranged cam tracks 39. When the disk l is horizontal, the cam track 39 rises from the lowest point at the WIt 44 in the direction A (FIG. 13) to its highest point after rotating about 45 degrees in the direction A. , and is again lowered to a position offset by about 90 degrees with respect to the groove 44 in the rotational direction A. From this point, the track rises sharply to a raised part of the annular collar 50, forming an abutment surface 40. The locking disc 1 shown is for a right-handed machine spindle 9. In the case of a left-handed machine spindle, the cam track 39 must be designed correspondingly in the opposite direction, ie opposite to the direction of rotation A. The illustrated locking disc l preferably has two grooves 44 and two cam tracks 39. However, the number of grooves 44 and cam tracks 39 may be greater or less than two.

On the tool side, a locking and adjusting element 7 is attached to the tool shank 1
3 on the end face on the machine spindle 9 side. This locking-adjusting element has a threaded pin 49, as in the embodiment of FIG. 1 (see detail in FIG. 3). This threaded pin is screwed into a corresponding threaded hole 17 in the tool shank 13. At the free end of the pin 49 a transverse member 6 in the form of a transverse pin 6 is provided. The tool shank 13 and the locking and adjusting element 7 are arranged coaxially, the axis of the transverse pin 6 intersecting the axis of the tool shank 13. A locking nut 18 is provided on the pin 49 in order to hold the locking and adjusting element 7 against rotation or to prevent it from moving unintentionally in the longitudinal direction. This locking nut rests against the end face of the tool shank 13.

In order to attach the tool shank 13 to the chuck 14 or to engage the locking and adjusting element 7 on the tool side in the locking device 36, a threaded pin 49 and a transverse pin 6, shown by way of example in FIG. A tool with (locking and adjusting element 7) is inserted into the receiving hole 20 (FIG. 2) of the chuck 14. that time,
The end of the transverse pin 6 passes through the groove 44 in the locking disc I and reaches the beginning of the cam track 39 on the locking disc. In this state, the locking disc l is moved by the spring force to the abutment head 4 of the bolt 2.
It is in contact with 8. In this state, the locking disc l is rotated by 90 degrees in the direction of rotation A (FIG. 13), ie in the opposite direction to the normal working opening and turning direction of the spindle 9. The free end of the transverse pin 6 then moves along the cam track 39. The free end of the pin 49 rests against the abutment surface 11 of the machine spindle 9, so that the locking disc 1 moves against the spring force towards the chuck 14 during rotation of the tool. After approximately 45 degrees of rotation, the highest point of the cam track 39 is reached.

The locking disc l is then moved again by the spring 3 towards the machine spindle 9 until the end of the transverse pin 6 reaches the end of the cam track 39 and rests against the stop 40.

In this state, locking disc t h < contact head 48 of bolt 2
The positioning and locking device 7.36 is designed and arranged in such a way that the spring element 3 is not yet in contact with the spring element 3, so that the force of the spring element 3 is transmitted via the locking disc 1 to the transverse pin 6 and thus to the tool shank 13. As a result, the free end of the pin 49 is pressed against the axial stop 11 and the tool 15 thus reaches a predeterminable longitudinal position relative to the machine spindle 9. In this position of the tool 15, hereinafter referred to as the positioning position, the chuck 14 is not yet biased with force. However, the tool 15 is held by the stopper 40 in a complementary manner so as not to rotate. Cam orbit 39
The positioning state of the tool is maintained depending on the shape of the tool. That is, the positioning state can only be released by overcoming a predetermined force. The cam track 39 is preferably formed as follows. That is, tool shank 1
3 rotates 45 degrees and reaches the highest point, the horizontal pin 6
The tool 15 is thus designed to rotate automatically to its end position.

In this end position, the transverse pin 6 abuts against the stopper 40. In this positioning state, the tool 15 is already positioned in the longitudinal direction. The effective length of the tool is determined by the locking and adjusting element 7.
Or it is determined by the pin 49 coming into contact with the axial stopper 11 . The locking disc 1 engages with the horizontal pin 6,
Since the transverse pin 6 is locked in this position, unintentional falling of the tool 15 is effectively prevented. The tool can only be removed by deliberate and deliberate removal. That is,
It can be removed by rotating it 90 degrees in the opposite direction to the rotation direction A against the spring force and pulling it out from the accommodation hole 20. When reinstalling the tool after changing the tool,
Without adjusting the threaded pin 49, the same exact positioning in the longitudinal direction is achieved. After positioning the tool I5, the actual clamping process of the chaff 214 is started.

This is done in this example by pressure activation of the chamber 21.

Even if the pressure in the chuck 14 decreases during normal operation,
The tool cannot be released unintentionally (the torque is transmitted via the transverse pin 6 and the abutment surface 40). Small. Tools can be changed quickly and reliably,
In this embodiment, the cost on the expensive tool side is very low.

This is because only a threaded hole 17 needs to be provided in the tool shank 13 and the tool can also be clamped to other machines.

Accurate longitudinal positioning of the tool allows tool exchange without changing the basic alignment of the machine. For this purpose, the locking and adjusting element 7 is designed to be adjustable. Adjustment can be made by appropriately rotating the threaded pin 49 after removing the locking nut 18. Therefore, the effective length of the tool can be adjusted.

FIG. 4 shows another embodiment of the positioning and locking device. In this case, a locking and adjusting element 7 is provided on the tool side. , the functionality of this element is the same as described above. In this embodiment, the male thread 23 is attached to the tool shank 1.
3, and an adjustment nut 22 is attached to this male thread.

The axial stopper on the machine side indicated by 47 is the chuck 14.
is provided on the end face of the Adjustment of the effective length of the tool is done by adjusting the nut 22. An axial clearance shown at 24 in FIG. 4 near the upper end of the tool shank 13 serves to facilitate insertion of the tool shank 13 into the chuck 14.

The functionality of the embodiment shown in FIG. 5 is the same as that of the embodiment shown in FIG. The construction differs from the embodiment of FIG. 1 in that the locking disc 1a is designed differently, the bolt 2a and the recess 10a accommodates the locking disc 1a.

As can be seen in FIG. 5, the locking disc 1 is
The stopper that presses a is the contact type 4 as shown in Figure 1.
8, but by the circumferential collar 4 of the locking disc 1a.
It is formed by 6. When the tool 15 is removed, the collar 46 comes into contact with the end face of the machine spindle 9.

The bolt 2a is formed as a stud, the end surface of which is approximately at the same height as the upper surface of the locking disc 1a.

The embodiment of FIG. 6 is similar to the embodiment shown in FIG.
A spring element 3b is used instead of the coil spring 3. This spring element is made of an elastic material, for example rubber or plastic, and can be designed as a closing ring, a single cylinder, etc. As in the embodiment of FIG. 5, the locking disc 1b is provided with a circumferential tail 46. When the tool 15 is removed, the spring element 3b
is pressed against the outermost end face of the machine spindle 9 by. The recess 25 of the locking disc 1b and of the chuck 14b is formed correspondingly to the shape of the spring element 3b and serves to guide it.

FIG. 7 shows that the locking device 36c on the machine side is connected to the machine spindle 9.
An example is shown in which it is formed integrally with c. machine spindle 9
is provided with a recess 10c on its end face. This recess is the first
This corresponds to the through hole 12 in FIG. Two Wlt26 arranged in the diametrical direction are provided on the outer periphery of the recess 10c. This groove corresponds to groove 44 in FIG. Groove 26
A circumferential annular groove 45 is provided inside the machine spindle 9c at the end thereof. This annular groove is groove 2
6, it rises up to the side near the tool in the opposite direction to the normal tool rotation direction. Thus, when the tool shank 13 is rotated in a direction opposite to the working direction of rotation, the end of the adjusting and locking element 7 is pressed against the abutment surface 11 and locked in this position by a frictional connection. Due to the raised track of the groove 45, the horizontal pin 6 moves further upward when rotated in the opposite direction to the normal rotation direction, and therefore the pin 4
9 is pressed against the axial stopper 11.

In the embodiment of FIG. 8, the locking device 36d and the mechanical spindle 9d are also formed in one piece. machine spindle 9
The recess 10d of d is approximately cylindrical, and a circumferential groove 29, for example wedge-shaped, is provided near its inner end. On the tool side, instead of the transverse pin 6, two balls 27 are provided which are biased by a compression spring 28. This ball is forced outwardly by a spring 28. The ball 27 is mounted in a known manner in the head of the locking and adjusting element 7'. That is, the ball is supported in such a way that it can be pressed inward, but cannot be completely pulled out. In this case, shank 1 of tool 15
3 can be simply inserted, whereby the ball 27 engages in the groove 29 and the locking and adjusting element 7' together with the tool 15 is pressed against the axial stop 11 by the spring force of the spring 28. The transverse force exerted by the spring 28 via the ball 27 is converted into a longitudinal force by the groove 29, so that the locking and adjusting element 7' is pressed against the abutment surface 11.

9 to 12 show other embodiments of the tool-side formation of the positioning and locking unit 7.36. In the embodiment shown in FIGS. 9 and 11, the tool shank 13
a is provided on its back side with a pin 30 fixedly connected thereto. This pin 30 has a male thread, and two nuts 3I and 32 or 31 and 37 are attached to this male thread.

In the embodiment of FIG. 9, a locking nut 31 and an adjusting nut 32 are provided. In this case, the adjusting nut 32 is provided with two protrusions 6a, which correspond to the ends of the transverse pins 6, near its upper surface. The free end of the pin 30 is provided with a scale 33. The length adjustment that can be made by means of the adjusting nut 32 can be read off by this scale. In order to fix the adjusting nut 32, in this embodiment the adjusting nut 32 and the locking nut 31 are tightened together. In this embodiment, on the spindle side, the contact surface! A hole 34 can be provided in l.

This hole accommodates the graduated pin 33 of the tool shank 13.

In the embodiment of FIG. 11, the adjusting bush 37 with the locking nut 31 is attached to the tool shank 13b with a thread.
It is attached to the pin 30 of. The adjusting bushing 37 is provided with a transverse pin 6 near its upper end. In this case, adjustment of the effective length of the tool is likewise carried out by rotating the bushing 37 on the thread of the pin 30.

10 and 12 show a further embodiment of the locking and adjusting element 7 shown in FIG. The threaded pin 49 is the third
As shown, it may also be formed as a headed bolt. In this case, the horizontal pin 6 is installed in the hole of the bolt head. 1st theta
The figure shows a structure in which the horizontal pin 6 is directly attached to the threaded pin 49.

In the embodiment of FIG. 12, the screw pin 49 has a long head 3.
It has 8. A horizontal pin 6 is attached near the upper end of this head.

13 to 16 show the locking disc l already described on the basis of FIGS. 1, 2 and 3. FIG. The illustrated locking disc l described in the exemplary embodiment is preferably of circular design when viewed from above (FIG. 14), but it may also have any other shape, for example square or triangular. If a recess 10 is suitably formed in the machine spindle 9, the anti-rotation element 5 can be omitted, for example. The circular locking disc l shown in FIGS. 13 to 16 is very advantageous.

This is because the structure can effectively prevent tilting.

The embodiment shown in FIG. 7, in which the locking device 36c and the machine spindle 9C are formed in one piece, is only one of many embodiments. For example, the machine spindle 9 can be provided with a dovetail-like mating guide, in which the projection 7 with the transverse pin 6 can be accommodated in the form of a bayonet joint.

In the present invention, a drive unit having the features described in the general concept of claim 1 can be used. In this case, in order to position and lock the tool with a shank, a locking device 36 is provided in the chuck +4, in which the locking and adjusting element 7 on the shank 13 of the tool I5 can be adjusted. , can be positioned and locked in a self-locking manner and can be pressed against an axial stop 11.47 mounted on the device 7.36.

[Brief explanation of the drawings] Figure 1 shows the tool clamped to the chuck.
2 is a longitudinal sectional view of the positioning and locking device of the drive unit according to the invention, FIG. 2 showing the machine side part of the positioning and locking device of FIG. 1 in the unclamped state and without tools; FIG. 3 is a partial sectional view of a tool with a shank accommodated in the positioning and locking unit of FIG. 2, and FIGS. 4 to 8 are longitudinal sections of other embodiments of the positioning and locking device according to the present invention. 9 to 12 are views showing various embodiments of the tool-side structure of the positioning and locking device, with the tool partially cut away in the same way as in FIG. 3, and FIG. A perspective view of the locking disk, FIG. 14 is a plan view of the locking disk of FIG. 13, and FIG. 15 is a sectional view taken along the line xv-xv of FIG. 14.
FIG. 16 is a side view of the locking disc of FIG. 13. 1, Ia... Locking disc, 2, 2a... Bolt with collar, 2'... Bolt shank, 2''...
・Threaded bottom, 3, 3a...spring, 4...hole,
5...Horizontal pin, 6...Horizontal member, 7,36,
36c, 36d...positioning and locking device, 8...
Groove, 9,9c. 9d... mechanical spindle, 10. )Oa. l0C110d...concavity, 10'---<concavity,
11...Stopper, I2...Through hole, +
3,13a...Tool shank, 14.14a...Chuck, 15...Tool, 16...Bolt,
+7...screw hole, 18...locking nut, 19...
Machine housing part, 20... Accommodation hole, 21... Chamber, 22
...Adjusting nut, 23...Male thread, 24...
・Shaft setting part, 25... recessed part, 26... groove, 27
...Ball, 28...Compression spring, 29...Groove,
30... Pin, 3N... Locking nut, 32.
...Adjusting nut, 33...Scale, 34...
Hole, 37...Adjustment bushing, 38...Head, 3
9...Cam orbit, 40...Stopper, 4!・・・
- Chamfered portion, 42... Slanted surface, 43... Hole, 4
4...Groove, 45...Annular groove, 46...Brim,
47... Axial stopper, 48... Contact,
49...Pin, 50...Ring, ■...Machine side part, ■...Tool side part, A...Rotation direction

Claims (1)

[Claims] 1. Drive for a rotating shank tool, comprising a positioning and locking device, a chuck fixed to a machine spindle or the like, and a locking and adjusting element provided on the tool shank. In the unit, a locking device is provided for positioning and locking the shank tool in the machine spindle, in which a locking and adjusting element provided on the shank of the tool is self-adjusting. A drive unit characterized in that it can be positioned and locked in a locking manner and can be pressed against an axial stop mounted on the device. 2. characterized in that the locking device (36) is equipped with a form-complementary retaining element (40) which prevents rotation of the tool shank (13) in a direction opposite to the working direction of the machine spindle (9); A drive unit according to claim 1. 3. A locking and adjusting element (7) is provided on the machine spindle (9) side of the tool shank (13) coaxially with the tool shank and has a transverse member (6) near its end. A drive unit according to claim 1 or 2, characterized in that: 4. From claim 1, characterized in that the locking and adjusting element (7) is adjustable in the axial direction of the tool shank (13) in order to pre-adjust the effective length of the tool. The drive unit according to any one of items 3 to 3. 5. The locking and adjusting element (7) consists of a threaded pin (49) which can be screwed into the tool shank (13), which threaded pin can in particular be secured by a nut (18) attached to it. A drive unit according to any one of claims 1 to 4, characterized in that: 6. The locking and adjusting element (7) consists of a threaded pin (30) fixedly connected to the tool shank (13), and an adjusting nut (32) with a transverse member (6) is attached to said threaded pin. 5. Drive unit according to claim 1, characterized in that the adjusting nut can be fixed, in particular by a further nut (31). 7. At the top of the pin (49; 30), place the length adjustment scale (3
3). The drive unit according to claim 1, further comprising: 3). 8. The positioning and locking device (7, 36) is attached to the chuck (14)
) and the machine spindle (9), and a locking device (
36) is the machine spindle (9) or chuck (14)
Claim 1 characterized in that it is attached to
The drive unit according to any one of Items to Item 7. 9. The locking device (36) comprises a locking disc (1), which is biased by a spring force in the axial direction of the machine spindle (9). The drive unit according to any one of Items 1 to 8. 10. A locking disc (1) is axially slidably supported on the machine spindle (9) and is mounted by means of at least one compression spring (3) on an axial stop (11; 47).
10. The drive unit according to claim 9, wherein the drive unit is biased toward. 11, the axial stopper (11) is the adjustment and locking element (7
11. Drive unit according to one of claims 1 to 10, characterized in that it is formed by a side surface of the machine spindle (9) that faces the machine spindle (9). 12, the locking disc (1) is the axial stopper (11)
at least one cam track (39) facing the
12. Drive unit according to claim 9, characterized in that the cam path ends at at least one stop (40). 13. A locking disc (1) is mounted floatingly and non-tiltingly between the machine spindle (9) and the chuck (14) and is connected to the axis of the tool shank (13) by at least one bolt (2). Drive unit according to any one of claims 9 to 12, characterized in that the drive unit is guided in a direction. 14. Claim 13, characterized in that the bolt (2) is provided with a stop (48), which limits the movement of the locking disc (1) towards the axial stop (11). Drive unit as described. 15. The locking disc (1) is provided with a recess (8) on its outer surface, one end of the transverse pin (5) is located in said recess as an anti-rotation member, and the other end is provided in the machine spindle (9). The drive unit according to any one of claims 9 to 14, characterized in that: 16. A central recess in which the locking device (36) has at least one groove (8) for inserting a locking and adjusting element (7) with a transverse member (6) of the tool shank (13). (12) The drive unit according to any one of claims 1 to 15, characterized by comprising: (12). 17, a central recess (1) with at least one groove (8);
17. Drive unit according to claim 16, characterized in that 2) is provided on the locking disc (1). 18. The locking disc (1a) has a collar (
46), the collar forming a stop for the movement of the locking disc (1a) towards the axial stop (11). The drive unit described in any one of the preceding paragraphs. 19, the locking disc (1) has at least one recess (4
, 25), the recess accommodating a part of the at least one spring element (3, 24). Drive unit as described. 20, the locking and adjusting element (7) has at least one ball (2
7), this ball is biased by a spring force transversely to the axial direction of the tool shank (13), and the locking device (36) locks the circumferential groove (29) of the machine spindle (9d). 9. Drive unit according to claim 1, characterized in that it is formed by a recess (10d) provided with a recess (10d). 21. The axial stop (47) is provided on the end face of the chuck (14), and the corresponding counter stop (22) is provided on the outer peripheral surface of the tool shank (13). The drive unit according to any one of Items 1 to 20. 22, the mating stop (22) is adjustably mounted for longitudinal positioning and in particular with an adjusting nut (
22) The drive unit according to claim 21, characterized in that it is formed as: 22). 23. Drive unit for a rotating shank tool, comprising a positioning and locking device, a chuck fixed to a machine spindle or the like, and a locking and adjusting element provided on the tool shank, A locking device is provided in the chuck for positioning and locking the tool, and a locking and adjusting element provided on the shank of the tool is positioned and locked in a self-locking manner within said locking device. A drive unit characterized in that it can be stopped and pressed against an axial stop attached to the device.