DE8330332U1 - Device for changing tools on a drilling machine - Google Patents

Description

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The invention relates to a device 2um tool » weohsel on a deep drilling machine that is equipped with a or several rotationally driven drilling spindles are provided, which are mounted on a slide in the direction of a Werketttok is movable, and an exchangeable arm with grippers has, between a working position and a storage and loading unit perpendicular to the axis of Drilling spindle can be pivoted »and furthermore with a magazine with a large number of recordings which are adjustable in such a way that they can also be brought into a storage and loading position, in which Working position the ßreifzangen aligned coaxially with the tools in the drilling spindles are and include these, and in the storage and loading position the € grippers with the recordings are aligned coaxially »in such a way that the tools are removed from the receptacles in the gripping tongs or

reversed are transferrable.

such a device is from DE-OS 25 12 known. In this device, the magazine is arranged with respect to the drilling spindle so that the axes of the Tools in the magazine perpendicular to the axis of the drilling spindle

are arranged. In order to move the tools from the working position (work spindle position) to the storage area with the help of an exchangeable arm.
and bring about loading position (magazine position)
the change arm (gripper arm 17)
rotatable (axis 46) a gripper arm, as well as this j

also rotatable (axis 14) a gripper j

ν wing with two grippers (11, 12). To change [

the position of the grippers from the working position in '

Storage and loading position is not just a swiveling )

of the exchangeable arm, but also a rotation of the \

Gripper arm on the change arm and the gripper wing on the;

Gripper arm, each required at 90 °. aside from that
you need two gripping tongs for changing ·· only one drilling spindle and it is also necessary, a, the gripper arm on one parallel to the drilling spindle
(Slidable arm to be provided for changing tools

to be able to perform.

The construction of the change arm according to this known

I device is very cumbersome in that it requires- I

lent, two more parts on the exchangeable arm

(Gripper rocker, gripper wing) against each other and \

rotatable with respect to the change arm (axles 14, 46) to be provided t

and, moreover, is not expandable in such a way that at the same time on more than one drilling spindle, E.g. on two drilling spindles, the tools can be exchanged without the movement sequence of the Change arm would have to be changed fundamentally.

The object of the invention is accordingly to develop the device mentioned at the beginning in such a way that at Deep drilling machines, which can be designed with one or more spindles, make a tool change as simple as possible is made possible. In addition, the operation of the device should then be as simple as possible can be developed that in the case of - with conventional means - determined wear of the Tools these can be quickly removed from the drilling spindle or the drilling spindles and replaced by unused ones sharp tools can be replaced.

According to the invention, this object is achieved in that the recordings of the magazine

extend parallel to the drilling spindle or to the drilling spindles and also parallel to the drilling spindle or to the drilling spindles are adjustable, that also the recordings of the magazine with the drilling

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spindle are aligned so that the change arm when pivoting only in the mentioned to the axis the drilling spindle vertical plane the tools from the working position in the storage and loading '■ position, and that a transport device is also provided, which is in storage and loading position the tools in the axial direction from the grippers into the receptacles in the magazine

ν or vice versa shifts. Advantageous further training

of the invention are defined in the subclaims.

A considerable simplification compared to the prior art results from the fact that the change arm is now only has to pivot in one plane, while on the other hand exploited the displaceability of the drilling spindle and to move the tools in the storage and A separate simple transport device is provided for loading the tools from the

Gripping pliers or from the gripping pliers into the receiving devices of the magazine pushes. At the same time, with this simple structure, it is also possible to use multi-spindle Can operate deep drilling machines with it. You just need to be next to each other at a distance of the drilling spindles to provide a corresponding number of gripping pliers, since the invention does not, as in

known institutions (DE-OS 25 12 254; see. But also DE-AS If 77 501) for changing a tool requires two grippers from a drilling spindle.

An exemplary embodiment of the invention and its advantageous developments are referred to below on the accompanying drawings.

They represent:

Figure 1 is a schematic side view of a deep drilling machine;

Figure 2 is a plan view corresponding to the

Arrows H-II in Fig. 1 on the deep drilling machine according to Mg. 1;

Figure 3 is a front view according to the arrows HI-III 1rt Flg. 1 of the deep drilling machine according to Fig. 1;

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FIG. 4 shows a plan view (corresponding to arrows IV-IV in FIG _{. 8.} 3) of the transport device, which is part of the deep drilling machine according to Pig "I to 3;

FIG. 4a shows a section along the line IVa-IVa in FIG. 4;

FIG. 5 shows a section along the line V-V 1n Mg. 4i

Figure 6 is a plan view of the magazine of the deep drilling machine according to Figures 1 to 3;

FIGS. 6a-6b sections along the lines VIa-VIa, VIb-VIb, VIe-VIc in FIG. 6;

FIG. 7 shows a section along the line VII-VII in FIG. 6;

FIG. 7a shows a section along the line VIIa-VIIa in FIG. 7;

FIG. 8 is a view in the direction of arrows VIII-VIII in FIG. 6;

FIG. 9 shows a schematic representation of the one used in the deep drilling machine according to FIGS. 1 to 3 Change arms 9;

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Figure 10 shows a section along the line X-X 1n Flg. 9;

FIG. 11 shows a section along the line XI-XI in FIG. 9.

On the two-spindle deep drilling machine shown schematically in an overall view in FIGS. 1 to 3, bores 1 are drilled in a workpiece 2, for example the cylinder block of a motor vehicle engine, with the aid of deep drilling tools 3, 3 '; it can be the so-called single-lip drilling process, the BTA process, or the ejector process; The deep drilling tools are designed accordingly. They are taken up by drilling spindles 4, 4 ^f which are driven by motors S, S ¹ . Drilling spindles 4, U 'and motors 5, S ⁽ are arranged on a slide 6 and can be moved in the direction of workpiece 2 for the purpose of feeding *

The design of the deep drilling machine according to the invention now serves to remove the deep drilling tools 3, 3 * when worn - which is determined by measuring the contact pressure to generate a certain feed - from the drilling spindles 4, 1 'and store them in a magazine generally designated 7 , and then to remove new, ie not worn, deep drilling tools from the magazine 7 and reinsert them into the drilling spindle H, Ί ¹ . The deep drilling tools, provided they are inserted into the magazine 7, are denoted by 23, 23 '. Two positions are possible (see FIG. 7a) by means of which the worn and not yet worn deep drilling tools differ (see further below). When the tools have been pulled out of the magazine and / or are in the transport or working position, they are denoted by 3, 3 '.

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The drilling spindles 4, 4 * are with suitable clamping devices fitted. A suitable clamping device for this is for example in the German patent application P 33 20 612.0-14 v. June 8, 1983 by the same applicant "

The magazine 7 is schematic in PIg * 3 and more precisely in FIG represented »It is formed by the fact that several of the recording of the deep drilling tools 3, 3 'or «23« 23' determined receiving tube 8 · wfe at «magazine of a drum revolver - along A cylinder fitting are best placed on the In Flg. 6 arranged on the far left receiving tube 8 and further to the sections attached to it according to FIGS. 6a to 6c seen, is only the rear third of the receiving tube 8 formed with a full cross-section. In the middle third If the cross-section is about an angle of 90 * to 110 ° milled away; in the cross-section according to FIg * 6c, the cross » cut over an angle of slightly more than 180 °. The transition from the cross section according to FIG. 6a to the cross section according to FIG. 6b is at point a; the transition from the cross section according to FIG. 6b to the cross section according to FIG. 6c is located at point b. In this embodiment of the Pick-up tube 8, it is possible to deep drilling tools, one of which

; ' one (far left in Fig. 6) in its contour with dash-dotted lines

is shown, initially in such a way from the top into the top with more than 180 ° open part of a receiving tube 8

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add that there is the area of the deep drilling tool, the diameter of which is equal to the inner diameter of the receiving tube 8 1st, is deposited, and then the tool lengthways insert it so far that it is also possible when rotating «Read entire magazine 7 cannot fall out, well then yes, the entire area of the deep drilling tool in the rear part of the receiving tube 8, which has the full cross-section Flg. 6a is held.

A change arm 9, which - corresponding to the two drilling spindles 4, 4 ¹ - is provided with two gripping tongs 10, 10 ', grips in the working position the deep drilling tools 3, 3' clamped in the drilling spindles 4, 4 'as soon as they are worn. This is determined in a known manner by measuring the contact pressure of the deep drilling tools on the workpiece at a given feed rate and therefore does not need to be described in detail in the present context. The clamping devices (not shown) in the drilling spindles 4, 4 * are then released. The carriage 6 with the drilling spindles 4, 4 * leads to the right 1n Fig. 2 1n the end position shown there. The grippers 10, 10 * hold the deep drilling tools 3, 3 *. Then the change arm 9 is pivoted 1n * in the direction of the arrow TI (F1g. 3) 1n the storage and loading position and places the deep drilling tools 3, 3 'on I prisms 12 «12' (see also Mg. 5), the fixed on |

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Boom 13 are arranged, which is firmly connected to the deep drilling machine. The gripping tongs 10, 10 'are then opened; the deep drilling tools 3, 3 ¹ are pushed into the receiving tubes 8 of the magazine 7 by claws 14, 14 ^{1 of a transport device.} The claws 14, 14 'are at the (in Fig. 1) left end of rods 15, 15 ¹ , the. are connected to one another via a web 16. A piston rod 17, which is arranged in a double-acting cylinder 18 and is hydraulically displaceable in both directions, engages the web. The fact that the claws 14, 14 'in FIGS. 1 and 2 do not lie on the same horizontal line can be explained by the fact that the planes in which they lie lie obliquely with respect to the plane of the drawing. The worn deep drilling tools 3, 3 ^{1 are} pushed into the receiving tubes 8 of the magazine 7 until the tips 19, 19 'of the worn deep drilling tools 3, 3' abut stops 20, 20 ', which via a bligel 21 and a boom 22 are also arranged in a stationary manner on the already mentioned boom 13. After this insertion of the worn deep drilling ^{tools 3, 3 1} 1n the magazine 7, the latter is rotated so that other tools, such as sharp, ie not yet worn tools 23, 23 are located above the gripping tongs 10 * 10 *. These are pulled out of the receiving tubes 8 of the magazine 7 by means of the claws 14, 14 'and into the support on the prisms 12, 12'. Included

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after a tilting movement of the entire transport device, the claws 14, 14 * engage in the groove 32 (FIG. 5) at the end of the deep drilling tools 23, 23 '. The claws 14, 14 * are then moved away. The gripping tongs 10, 10 * grasp the new tools 23, 23 '. The change arm 9 swivels in the opposite direction - that is, opposite to arrow 11 in FIG. 3 - back into the working position according to FIGS. 1 to 3. The slide 6 moves to the left from the position shown in FIG 'The deep drilling tools 23, 23' in the position in which in £ ig. 2 include the deep drilling tools 3, 3 *. The clamping devices in the drilling spindles 4, 4 * are clamped. The gripping tongs 10, 10 'are released. The change arm 9 swivels out of the position so that it cannot hinder the advance movement of the carriage 6. The next work cycle of the deep drilling machine with sharp deep drilling tools 23, 23 'can begin. As soon as the corresponding wear of these deep drilling tools is determined, the next change cycle begins.

The previous description already shows that the worn deep drilling tools 3 or 3 '1n the magazine so far 1n Fig. 1 are pushed to the left until they butt against the stops 20, 20 ', so your tips are the assume positions marked 19, 19 '. This location

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differs from the position of the as yet unused, i.e. sharp, deep drilling tools 23, 23 '. After folding away the rear wall 80 in the position shown, they are pushed into the receiving tubes 8 in the magazine 7 from the left (FIG. 1) and assume the position shown for the deep drilling tools 23, 23 'in which they are pushed in so far that they abut against a plate 21 with their right end (in FIG. 1), that is to say the clamping shaft. The plate 2h has recesses 25, 25 * at the level of those receiving tubes 8 which are aligned with the stops 20, 20 'and the prisms 12, 12 *. If, therefore, deep drilling tools are inserted into the holding tubes 8 from the left, this is the case with all holding tubes 8 except for those whose left end is covered by the stops 20, 20 *. These are the only ones in the extension of which to the right the plate 24 does not represent a stop * because the recesses 25, 25 'are located there. Thus, the position of all sharp deep drilling tools 23, 23 ', which - with the plate 80 folded away - are inserted from the left as far as possible into the receiving tube 8, is clearly defined by a stop on the plate 24 1n Fig. 6 the deep drilling tool on the far left. The plate 80 can be folded away after releasing the handle 26.

The deep drilling tools can therefore occupy two positions:

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a) the unused sharp deep drilling tools 23, 23 * are inserted into the receiving tube 8 from the left (manually; with plate 80 folded away) · up to the stop on plate 24 j

b) the worn deep drilling tools 3, 3 'are in the Pick-up tube β pushed in from the right (from the transport device 14-18 after being deposited by the exchange arm 0 on prisms 12 »12 'or 1n the part that is open at the top the receiving tube 8) «up to the stop at the stops 20, 20 ', whereby the elf life is not hindered by the plate 24, since this is from has recesses 25, 25 '.

The different location of the worn and the still unused sharp deep drilling tools are used to to determine whether deep drilling tools used by the Trans « port device 14-18 from the receiving tubes. 8 to the right be pulled into a position in which the grippers 10, 10 * of the exchangeable arm 9 are detected, are used or are still in focus. Are they worn deep drilling tools, then the machine switches off and gives a signal that the magazine needs to be refilled with sharp deep drilling tools is initiated. In this way it is avoided that in the storage and loading position of the change arm 9 after the storage of the worn deep drilling tools this again is loaded with already worn deep drilling tools.

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It is ensured that the described cycle of tool change expires as long as the receiving tubes 8 of the Magazine 7 not yet worn, sharp deep drilling tools can be removed.

The manner of determining whether the tools are worn or not is 1n F1g. 7a shown. A carrier plate 27 is arranged on the boom 13. It carries three proximity switches 28 to 30 one behind the other in the direction of the position of the deep drilling tools 1m magazine , are all proximity switches 28, 29, 30 at a short distance from an outer surface of the deep drilling tool «They all have contact ^{11 in the} sense of their function with the deep drilling tool 23 or 23 *", so they deliver a signal with the logical value "1". In The position of a deep drilling tool 3, 3 * is drawn in dash-dotted lines, which is worn, ie the tips 19 or 19 'of which are in contact with the stops 20, 20'. 0 "," 1 "," 0 "· In detail, the various displays result from the truth table which belongs to FIG. 7a.

This means that the storage of worn blunt tools The magazine is in a different position than the insertion of sharp tools. The scanning of the position by proximity switches or other measuring devices allow the plague position, whether the deep drilling tools 1m magazine are still sharp, This determination is made before the deep drilling tools are taken over from the pickup tube * 8 1n the position 1n of the the clamps 10, 10 * are in the storage and loading position, So for the deep drilling tools that see 1n the receiving tubes 8 are located in the respective position of the magazine 7 align with the prisms 12, 12 'and through the transport device 14-18 can be moved to the right. In this way it is avoided that the automatic change cycle can lead to already worn deep drilling tools 1n the gripping tongs 10, 10 * of the change arm 9 and from there to load into the drilling spindles 4, 4 *.

The corresponding electrical control devices result for the person skilled in the art without further ado. It is only necessary, corresponding to that shown in FIG. 7a Truth table in the event of being sharper Tools to release the further cycle and just in case to stop other signals and to indicate this fact by means of a horn signal or a light indicator.

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See the embodiment example and the scanning shown there by proximity switches 28, 20 * 30 along the axial Direction of the deep drilling tool «! For this purpose, dl · groove 32 been riveted, it lasts at the same time! allows deep drilling eitteli dir steals 14, 14 from the recording Pipes 8 of the Magaalni 7 protrude.

The Hecheelar 9 can be rotated in a bearing block 33 Boom 13 stored · It is in the working position according to Fig «1 bit 3 trimmed by» that a Supported 34 rests on an eegeniager 35 · The rotary drive The hydraulic rotary 2 y11nder 36 takes care of the deficiency via a transmission 37.

Figures 4 and 5 show the transport device, more precisely: the mechanism for moving the claws 14, 14 '* Fig. Is an oblique view of Fig. 3. The claws 14, 14 ', the shape of which can be seen from Fig. 4a, are - as already mentioned · attached to the rods IS, 15 '. These poles 15, IS * are in turn connected to one another via the bridge 16 and hydraulically via the piston rod 17 by means of the cylinder 18 can be moved in both directions.

So that the claws 14 in the groove 32 in the deep drilling tools can swing in, as shown in Flg. 5 can be seen at the top right 1st, the entire through rods 15 with claws 14, furthermore be tiltable transport device formed by transverse web 16 and cylinder 18. This is done in that the rods 15 and the cylinder 18 in one by two parallel Plates 38, 39, .such as the two transverse webs 40 and 41 formed housing are guided. This housing 1st at the Pivoting plate 42 firmly attached, which in the bearing block 43 can be tilted about the shaft 44. The bearing block 43 is arranged on the boom 13. Tilting the swivel plate | 42 takes place by means of the hydraulically operated, double! acting cylinder 45 in which a piston rod 46 is guided p 1st, which engages the pivot plate 43 via the joint 47. ;, For this purpose, the lower end of the pivot plate 42 is designed as a fork. The tilting is done so that the individual Parts take the position el drawn in dot-dash lines in FIG. 5, this being for the sake of clarity Tilting position only for the swivel plate 42, the rods 15 and the claws 14 are shown - MU connected to the transverse web 41 is a connection 48, which is shown in FIG Normailage touches down on the stop 49, which in turn starts

is arranged on the plate 50, which on the boom 13 is attached. The plate 50 also carries a stop bar 51 against which the deep drilling tool is attached by the claws 14, 14 * 23, 23 * is used before the grippers 10, 10 'grasp it.

Fig. 6 shows in detail the magazine 7 with the receiving tubes 8. The receiving tubes 8 are arranged on a cylinder 52 and on this by clamping pieces 53, which with the cylinder 52 are bolted. The cylinder 52 is integral formed with a hub 54. The hub 54 is connected to a shaft 55 which is in the bearing tube 56 with the help of Storage 57 is stored. The bearing tube 56 is connected to the boom 13. The gradual and cyclical drive of the Shaft 55, which brings about the step-by-step rotation of magazine 7, takes place via motor 58 and indexing gear 59.

The exemplary embodiment described with reference to FIGS. 1 to 8 starts with the loading of a two-spindle deep drilling machine off * Accordingly, two deep drilling tools are always removed from the two spindles 4, 4 * at the same time, in two receiving tubes. 8 of the magazine 7 and at the same time two sharp tools 23, 23 * again

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taken. This means that the distance between the grippers 10, 10 * (Fig. 3) must correspond to the distance between the spindles and that the receiving tubes. 8 - more generally: the receiving devices provided for the individual deep drilling tools in the magazine - must also be arranged in pairs with the same distance, whereby the step movement, with which the magazine is rotated further or - in general terms: moved further - must be coordinated so that in each step a different pair opens up to the access of the transport device with also two claws. Are made from a pair of receiving tubes. 8 two deep drilling tools removed, then these receiving tubes initially remain empty. The magazine remains in position and takes the same deep drilling tools as blunt tools after use back on. Then the magazine rotates one step further and two sharp tools are removed.

While the embodiment was based on a kind of drum magazine, it is also possible to build other magazines, which do not rotate, but rather have receiving devices in different positions on top of each other.

Fig. 9 shows in detail the structure of the change arm 9. It is formed by a U-shaped cross-section support 60 open at the bottom. The gripping tongs 10, 10 "exist each of a fixed stop part 61, 61 · and a movable pressing part 62, 62 '. The stationary stop parts 61, 61 'are, as can be seen from FIG. 10, fixedly attached to the carrier 60 by means of screws 63. A control slide 65 can be displaced in bearing bushings 64, 64 '. This control slide 65 is used to move the pressure parts 62, 62 * so to pivot that between them and the fixed stop parts 61, 6T, the deep drilling tools 3, 3 'or 23, 23 * are clamped. For this purpose, pins 67 arranged on the pressing parts 62 and 62 * engage (cf. Fig. 11) of both seldom enter the annular gap 68 which is formed between the rings 69 and 70, both of which are arranged on the control slide 65, the ring 70 being placed on the control slide 75 by the locking ring 71 Is secured against shifting to the right, whereas the ring 69 is secured against another by disc springs 72 Ring 73 is supported, which in turn is supported by the locking ring 74 on the control slide 75 against displacement secured to the left 1st '. If the control slide 65 in FIG. 9 is now shifted to the right, then

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the deep drilling tool 3 b2w. 3 'of the pressing part 62 or * 62 'with a force against the stop rope 61 or he printed "which depends on the extent to which the Tetler feathers 72 are pressed together by the ring 73 * One such Pressing begins when the pressure element 62 on the deep drilling tool 3 is applied, so that a further shift of the Ring 69 to the right not possible 1st · From this moment on the control slide 65 and with it the Ring 73 to the right (in Fig. 9), then the disc springs 72 compressed.

The spool 65 Ut movable via a fork connection 75 connected to the piston rod 76 of a double-acting hydraulically driven cylinder 77, the under Pressurized medium Supplied via connections .78 and «79 will.

In the entire arrangement, a very high accuracy of the positioning of the deep bolir tools with respect to the receiving openings of the drilling spindles 4 _f 4 'is important. For this reason, the axis X of the deep drilling tools 3, 3 * is lower than the pivot point Y of the change arm 9 by the distance h relative to the horizontal, so that it moves away when the change arm 9 is pivoted. from the

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clamped deep drilling tool 3 or 3 ¹ 1n in the direction of the path 11 first results in a movement of the attachment part 61 or 61 'fixed on the carrier 60 laterally away from the deep drilling tool. Such a lateral movement component is given when the axis X is arranged below the pivot point Y by a certain amount h in the designated catfish. The position, for example, of the stop part 61 shortly after the start of the pivoting movement is shown in phantom in FIG. 1g * 9. In this way, when the gripping tongs 10, 10 * are moved away from the clamped deep drilling tools, there is no jamming or pressing or the like.

From Figures 9 to 11 also shows how to use of a similar construction can also provide four or six gripping pliers instead of two on one change arm; this would be the case »if one - as mentioned above - also accordingly larger magazines, possibly with other storage systems than that drum-like structure.

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Claims (9)

DREISS, HOSENTHIEN & FUWLoSJDORE »HANS MSNQ ^ OH PATENTANV & LTB I I I *" I ": P-7900 STUTTGART UWE DREISS Authorized representative at the European Patent Office ffrniflsiStiii Dr.Jur" Dlpl.-lne "M.Sc. European Patent Attorneys TF (OTTI) 246734/44 HEINZHOSENTHIEN TOIDEAPAT DrHna, Olpl.-Infl. TX 7-22 247 Idea d juRNFUHLENDORF rSl «, .- - ^ Dlpl.-Ing. I "I visitors Γ - | DRBSS, HOSENTHIEN & FUHLENDORF, D-7000 STUTTGART 1 Applicant: TBT Tiefbohrtechnik GmbH & Co. KG AmtLAkLZ. Your reference Our reference Date Off.Ser.No. Your Ref. Our Ref. Date G 83 30 332.4 4301 108 7/9/85 D / mz Title: Device for changing tools on a drill. Protection claims 1. Device for changing tools on a deep drilling machine, which is provided with one or more rotationally driven drilling spindles, which are mounted on a slide (6) can be moved in the direction of a workpiece (2) and have an exchangeable arm (9) with gripping tongs (10, 10 '), between a working position and a storage and loading position perpendicular to the axis of the The drilling spindle can be pivoted, and furthermore with a magazine (7) with a large number of receptacles (8), which are adjustable in such a way that they can also be brought into a storage and loading position, with PoitiOheokKonto Stuttoart 807 71-70Ä] bLZ " kbdidiro) 'BresdMrttanktttuttoart 1919 894 (BLZ 800800 00) In the working position, the grippers are coaxial with the tools in the drilling spindles (3.3) are aligned and include these, and in the storage and loading position with the grippers. the receptacles (8) aligned coaxially are such that the tools from the recordings (8) can be transferred into the gripping tongs or vice versa; characterized in that the receptacles (8) of the magazine (7) are parallel to the drilling spindle or to the drilling spindles (U, 4 ») extend and are also adjustable parallel to the drilling spindle or to the drilling spindles that further the recordings (8) of the magazine (7) are aligned with the drilling spindle so that the change arm when pivoting only in the mentioned to ?? Axis of the drilling spindle vertical plane the tools from the working position to the storage and loading position spends, and that a transport device (14 to 18) is also provided, which is in the storage and loading position the tools (3, 3 ') in the axial direction from the gripping pliers (10, 1OM in the receptacles (8) of the magazine (7) or vice versa. I I 2. Apparatus according to claim 1, daduroh characterized in that the displacement of the tools (3, 3 ^f ; 23, 23 *> from or in the gripping tongs (1O ₁ 10 ') of the exchangeable arms C9) in its storage and loading position by means of a double-acting cylinder (18) takes place. 3. Apparatus naeh claim 2, characterized in that the cylinder (18) with a piston rod (1?) Engages a rod (IS, IS ♦) which pushes the tools (3,3 *) with its front end, and that the front end of the rod has claws (14, 14 ') which pull the tools (23, 23) in that they engage in grooves (32) of the tools and that the cylinder (18), the piston rod (17 ) and the part of the transport device containing the claws (14, 14 ') is tiltable in order to bring the claws (14, 14 ¹ ) into engagement with the groove (32) of the tools (23, 23'). 4. Device according to claim 1, characterized in that dab the magazine (?) through a variety of receiving tubes (8) is formed, which are arranged parallel to one another along a cylinder surface, and that .. = the magazine (7) can be rotated step by step around an axis that is parallel to the axes of rotation of the drilling spindle (4,4 *) and runs perpendicular to the swivel plane of the change arm (9). • • «• ti II« · I I I 1 I I • · t Il II · »« »ι ι • · I Il · · I « ·· I Il ·· lilt » / C ¹ 5. Device according to claim 1 or one of the following, characterized in that on an arm (13) carrying the magazine (7) in alignment with the magazine Proximity measuring switch (28, 29, 30) for measurement the position of the tools (23, 23 ') are arranged. 6. Device according to claim 1 or one of the following, characterized in that the magazine (7) as one of a stepping motor (68, 59) step by step rotatable drum or chain magazine is formed, the receptacles (8) by tubes with over a Part of its length can be formed with a cross-section open on one side. 7. The device according to claim 6, characterized in that it is marked that the tubes forming the recordings are partially open at the top. 8. Apparatus according to claim 1, characterized in that the receptacles (8) in the axial direction of the tools first stops (20, 20 '), and in ent « opposite direction have a further stop. ·· t III «1ItM · ♦ · I ·· III · « 'rl - 9. The device according to claim 1 or one of the following »characterized in that a number of gripping tongs (1O ₉ 10 ') is arranged on the wax noise (9), which is the same as the number of drilling spindles (4, H'). End of Claims -