EP2937188A2 - Machine tool with integrated tool cartridge - Google Patents

Abstract

Machine tool, in particular in the form of a handheld power tool, with a housing main part, a tool holder (28) rotating about a work axis in operation, a drive (3) and a magazine body (7) for receiving different tools, the magazine body (7) being opposite the housing main part ( 5a, 5b) can be displaced back and forth in the direction parallel to the working axis of rotation (D), wherein the machine tool is preferably designed such that the drive (3) drives a drive shaft (19), which passes through the magazine body (7) and releasably the output shaft (4) of the drive (3) is connected, wherein the machine tool is designed so that the connection between the drive shaft (19) and the output shaft (4) is released when the carriage or the magazine body (7) in Change position is and is established when the carriage or the magazine body (7) is in the screwed position.

Description

The invention relates to a preferably configured as a screwdriver machine tool according to the preamble of claim 1.

A screwdriver comes with different screw bits used, depending on how the head of the currently used screws is designed, d. H. depending on whether it is z. B. crosshead screws, slot screws, Torx screws or the like. More.

In almost all known screwdrivers, the different screw bits are kept loosely stored in a so-called. Bit-box. The currently required screw bit is removed from the bit box and inserted manually into the tool holder. This is cumbersome and impractical in many cases, because there is always the danger that when quickly changing between different screw bits currently not needed screw bit is somewhere stored, where it is no longer found or falls down and then lost.

In order to remedy this, is of the German patent application DE 10 2011 082 787 proposed a screwdriver, which has a rotatable magazine body, which takes on the nature of the drum of a drum turret different screw bits and keeps stored.

In this screwdriver, the screw bit currently used for screwing is held in a rotationally driven from the side tool holder. The blade of the screw bit facing away from the end of the screw bit is supported against a Tool pressure pin, which in turn derives the forces transmitted to it by the screw bit on its side facing away from the screw bit in the housing of the machine tool.

In order to make a bit change, the known screwdriver is designed so that the blade end facing away from the tool pressure pin can be detached from the housing, whereupon the tool pressure pin is translationally displaced so that it can be used as it were "load stick".

Namely, it can be withdrawn so far that it takes the screw bit currently located in the tool holder back into the tool holder chamber of the magazine body. By turning the magazine body, another screw bit is brought into alignment with the tool pressure pin. If the tool pressure pin now pushed forward again, then pushes the said new screw bit in front of him, until it is positioned in the tool holder so that its blade looks out of the front of the same. Now the screws can start.

The fact that this construction does not use the drive shaft itself, but a separate tool pressure pin as a "load stick" and to support the forces occurring at the screw bit, has already gained much, u. a. because the drive shaft bearing can be dimensioned much weaker.

Nevertheless arise in this construction by the need to reestablish as such movable tool pressure pin before each screw and to solve before each tool change again, disadvantages.

It is therefore the object of the invention to provide a machine tool which is improved in terms of the pressure pin.

This object is achieved with the features of the first main claim. Accordingly, a machine tool, in particular in the form of a handheld power tool, is provided which has a housing main part, a tool receptacle rotating in operation about a working rotational axis and a drive.

The term machine tool is used in its most general meaning and includes z. B. also screwdriver. The term hand tool stands for a guided by the user with a free hand machine tool, such. B. a cordless screwdriver or an electric drill.

Said housing main part may be in one piece or consist of two or more interconnected components, usually in the form of half or partial shells. Preferably, the housing main part is designed so that it completely absorbs the drive, possibly the battery and in any case the magazine body in its interior when the machine tool is ready for screwing or drilling. As a rule, the housing main part also forms a pistol-like handle.

The machine tool according to the invention has a magazine body with tool receiving chambers for receiving different tools. The machine tool according to the invention is characterized in that the magazine body relative to the housing main part in the direction parallel to the working axis of rotation can be moved back and forth. In this way, the magazine body for the purpose of tool change preferably drawer-like be pulled out of the housing main body. This moves the Magazine body relative to the tool pressure pin, which as a rule resting as such relative to the housing main body. As a result, this pulls out the currently used screw bit from the rotatably driven tool holder and conveys it back into the corresponding tool receiving chamber in the magazine body.

The idea of moving the magazine body for the purpose of tool change rather than the tool pressure pin leads to significant improvements.

The fact that the connection between the tool pressure pin and the housing main body no longer needs to be detachable and recoverable connection more times, but an insoluble or in normal operation can not be provided connection leads to a substantial structural simplification of the invention screwdriver. At the same time, operational safety is usually improved. In the known construction, the user may be surprised by the fact that the tool pressure pin accidentally after the tool change has not been adequately fixed to the housing, whereupon it in the next screwing, which requires a strong pressing, to a sudden yielding of the screw bits through which suddenly comes out of its insufficient anchoring releasing tool pressure pin. The result is an uncontrolled slipping with the screwdriver.

Preferably, the magazine body is rotatably mounted in a carriage, which in turn is supported by means of at least one sliding guide in the direction parallel to the axis of rotation movable on the housing main body. This slide can, like a drawer, be pulled out of the housing main body. Preferably, the carriage forward, ie the side on which in schroubbereitem state, for example, the blade of the screw bit is pulled out.

It is particularly favorable if the sliding guide is an external guide or also comprises an external guide which consists of at least one and preferably at least two, in the ideal case, diametrically opposed slide tongues, which are guided on the outer surface of the housing main part. Such a guide on the outer surface of the housing main part has the great advantage that the guide can be made very generous, since it does not have to take into account the inner workings of the machine, which is supported at many points on the inside of the housing main body and therefore the for a Sliding guide still very limited space available.

For this purpose, the housing main part is preferably designed so that it has on its outer surface at least one guide groove for leading receiving a slide tongue. The guide groove and the slide tongue are ideally designed so that the corresponding slide tongue in schraubbereitem state of the machine tool extends beyond the area, in which the pistol-like handle is connected to the rest of the housing main body. Thus, the machine tool is compact even when a long and far extendable sliding guide is realized. Ideally, this at least one guide groove is designed so that its associated slide tongue can be inserted from the blade of the screw bit facing end face of the guide ago.

It is particularly favorable when the at least one guide groove forms an undercut, such that the guide arms received by it are perpendicular to their in all directions Movement direction is held by the guide groove, also in, for example, radially outward direction. Such a construction makes the sliding guide or the slide, even if it is made of plastic, insensitive to bending and torsional loads, so that overall results in a very stable slide.

Ideally, at least one, preferably at least two, mostly metal bearing balls are held at the bottom of the at least one guide groove, usually in a bearing cup formed in the housing main part at the corresponding location. On these bearing balls, the guide tongue assigned to this guide roll rolls off. In this way, a particularly easy run of the guide tongue results. Preferably, the positioning of the one or more bearing balls is selected so that they are in screw-in or drill-ready tool in the radially inward direction below a marked as the main grip surface portion of the guide tongue. Thus, it also gives easy running when strongly pressed on the main grip surface. For the same reason, it is favorable if the at least one guide tongue has on its inner side a guide groove for the ball or the balls.

It is particularly favorable if the magazine body is part of a tool magazine unit, which in turn is preferably guided translationally movably in the interior of the housing main part. In this way results in a double support, which makes the machine tool very robust, for example, against falls when pulled out of the tool magazine unit when the user has fallen from the machine tool during the tool change.

This double support can be realized particularly easily if the tool magazine unit comprises a magazine sleeve and a magazine body rotatably mounted in the magazine sleeve. The magazine sleeve can then be easily guided on its outer circumference relative to the inner surface of the housing main part, without affecting the rotational mobility of the magazine body.

It is particularly favorable if the machine tool comprises a coupling for coupling and uncoupling the drive shaft of the drive. Because then it is possible to pass through the tool magazine unit required on the side facing away from the drive side of the tool magazine unit drive torque without thereby affecting the displaceability of the tool magazine unit. Because the part of the shaft required for the drive, which is mounted in the tool magazine unit is unceremoniously withdrawn when pulling out of the tool magazine unit from the drive shaft of the drive, or uncoupled and postponed again in the course of pushing back the tool magazine unit, or coupled again.

This allows a very compact design. However, the coupling is preferably designed so that it works purely positive. Ideally, it consists of a coupling sleeve with a non-circular inner cross section and two shaft sections to be coupled together with a corresponding non-circular outer cross section. Ideally, the coupling comprises a sliding sleeve mounted in a sliding manner in the axial direction. This is designed so that the tool magazine unit can also be inserted into the housing main body maximally or even into its final position, when the drive shaft and the coupling sleeve are positioned relative to one another so that their profiles momentarily due to different rotational positions are not ready to snap. Although the drive shaft can not be pushed into the interior of the coupling sleeve initially, it does not hinder the complete insertion of the tool magazine unit, since it can not penetrate into the coupling sleeve, but displaces it. Once the drive is set in motion, the drive shaft of the drive rotates after a short time so that the coupling sleeve can now snap onto it. This is automatically coupled when starting up.

• Die Figur 1 zeigt ein erstes Ausführungsbeispiel in Gestalt eines Akkuschraubers in schraubbereiter Position.
• Die Figur 2 zeigt das gleiche Ausführungsbeispiel beim Werkzeugwechsel.
• Die Figur 3 zeigt das Ausführungsbeispiel gemäß Figur 1 in explodierter Darstellung.
• Die Figur 4 zeigt ein zweites Ausführungsbeispiel des erfindungsgemäßen Akkuschraubers in schraubbereiter Position.
• Die Figur 5 zeigt das gleiche Ausführungsbeispiel beim Werkzeugwechsel.
• Die Figur 6 zeigt den das zweite Ausführungsbeispiel bildenden Akkuschrauber in teilweise zerlegter Form, um dadurch die Innenführung der Magazinhülse am Gehäusehauptteil zu visualisieren, durch sich dieses zweite Ausführungsbeispiel auszeichnet.
• Die Figur 7 zeigt die andere Hälfte des das zweite Ausführungsbeispiel bildenden Akkuschraubers in teilweise zerlegter Form.

Further advantages, effects and design options of the invention will become apparent from the following description of an embodiment based on the figures.

• The FIG. 1 shows a first embodiment in the form of a cordless screwdriver in screwable position.
• The FIG. 2 shows the same embodiment when changing tools.
• The FIG. 3 shows the embodiment according to FIG. 1 in an exploded view.
• The FIG. 4 shows a second embodiment of the cordless screwdriver according to the invention in schroubbereiter position.
• The FIG. 5 shows the same embodiment when changing tools.
• The FIG. 6 shows the second embodiment forming cordless screwdriver in partially disassembled form, thereby visualizing the inner guide of the magazine sleeve on the housing main body, characterized by this second embodiment.
• The FIG. 7 shows the other half of the second embodiment forming the cordless screwdriver in a partially disassembled form.

THE FIRST EMBODIMENT

To recognize the basic principle of the invention, it is best first of all to use the FIGS. 1 and 2 to.

The FIG. 1 shows the screw-ready cordless screwdriver, which serves as an example here. However, the invention is also applicable to a drill or to a machine tool equipped with end mills or grinding pins.

As you can see, the carriage 25 is in Fig. 1 in its fully pushed onto the housing main body position. The slider tongue 26a extends beyond the area where the pistol grip merges into the remainder of the housing main body 5a. The rotationally driven tool holder 28 passes through the front plate of the carriage 25 and projects outwardly beyond it. In her example, a screw-bit is used.

The Fig. 2 shows the same cordless screwdriver for the purpose of tool change completely pulled out of the housing main body 5a carriage 25. Good to see the magazine sleeve 9, in the interior of the magazine body 7 is mounted rotatably. The latter can be seen through the large window of the magazine sleeve. A corresponding window is also present at the top of the magazine sleeve, to the purpose to be discussed later.

Good on the basis of Fig. 2 It can also be seen that the guide tongue 26a in the guide groove 30a of the Housing body is housed so that it fits substantially without offset in the outer surface of the housing main body.

Finally you see in Fig. 2 in the region of the guide groove 30a, on which the slide tongue 26a releases the view that the guide groove 30a is equipped in the region of its lateral edges with an undercut acting in a substantially radial direction, in which the edges of the long sides of the slide tongue engage in a form-fitting manner, so that they can not be pulled out of the outer guide groove 30a by forces in radially outward direction.

The Fig. 3 shows the detailed structure of an embodiment of the invention, which is designed here as preferably cordless-powered screwdriver or drill / screwdriver.

The housing

Good to see is here in two parts possibly also in several parts executed housing main part 5a, 5b. It preferably comprises two half-shells, which can be separated and attached perpendicular to the direction of displacement of the slide, which will be explained later.

When mounted as intended and ready for operation, the housing main part 5a, 5b preferably takes up the drive 3 and the magazine body 7 completely, possibly together with the magazine sleeve 9, the said components being explained in greater detail below.

The drive

Good to see is only partially illustrated engine 1. Preferably, directly to him a gear 2, ideally in the form of a Reduziergetriebes, attached - such that both form a firmly cohesive unit in the form of the drive 3. This unit is anchored to the housing main body so that it can derive the forces occurring during normal operation of the tool in the housing main body. The transmission can be designed as a transmission with a fixed gear ratio or as a multi-speed gearbox.

From the gear 2 is preferably in the form of a cantilevered stub shaft, the output shaft 4 out. This has on its outer circumference on a profile that fits together with the later yet to be explained coupling.

The tool pressure pin

The tool pressure pin 5, which is ideally located parallel to the output shaft 4, without coinciding with the output shaft 4 or being coupled to it in terms of power, projects from the transmission 2. As a result, the output shaft 4 is kept free of the pressure forces acting during screwing or drilling in the direction of the tool longitudinal axis.

The tool pressure pin 5 presses in operation on the blade or cutting edge facing away from the currently in use screw bits or drill. The tool pressure pin 5 can and must absorb considerable forces because z. B. when screwing the screw bit often has to be pressed firmly into the running example, as a cross recess profile of the screw when high tightening or release moments must be realized. Its anchoring to the drive 3 and the gear 2 allows it to derive the forces occurring in it more uniformly in the housing main part 5a, 5b than when the tool pressure pin 5 itself is attached directly to the housing main part, but this also seems fundamentally conceivable.

The tool pressure pin 5 is preferably made of metal.

The tool pressure pin is rotatably supported in particularly high-quality embodiments in order to keep as small as possible the part of the engine power that is lost due to friction. In other cases, such as where a rugged machine tool is to be created at low cost, the tool pressure pin is rotationally held on the drive, such as by being pressed into a receptacle on the drive, as in Fig. 3 shown.

The tool pressure pin has its own longitudinal axis W, which as a rule runs parallel to the axis of rotation D of the drive.

In the ready state (eg when starting screwing or drilling operation), the tool pressure pin 15 passes through the complete magazine unit, which will be explained in greater detail, and projects into the inner opening of the tool holder 28 or at least up to its rear side.

An important distinguishing feature over other similar devices is that the tool pressure pin 15 is in any case non-displaceable or even completely firmly connected to the housing main part and against this at least in the direction along its longitudinal axis W or the drive axis D is not movable.

The tool pressure pin 5 preferably has a magnetic or permanent-magnetic tip, so that the screw bits or other rotary tools adhere to the tool pressure pin, even if the slide to be explained in more detail is pulled out for tool change.

The tool magazine unit

The reference numeral 6, a so-called retaining ring can be seen, which holds the magazine body in the same even closer to be explained magazine sleeve.

The reference numeral 7, the magazine body is provided, which is similar in construction in this embodiment as the drum of a drum turret. The magazine body 7 has a central bearing bore and therefore grouped individual tool receiving chambers for immediate recording of a screw bits, a drill or any other Rotary tool. The magazine body 7 is preferably made as a whole from translucent plastic material, so that in any case it can be seen whether a tool receiving chamber is stocked or not. In addition, the magazine body 7 preferably for each receiving chamber, a window 8, which has the immediate view z. B. on the blade of the screw-bits, which is held in the respective tool-receiving chamber stored. In this way, the user z. B. quickly recognize and decide which of the different bits he wants to use.

The bits are in the Fig. 3 but also to recognize, but they are not part of the protected machine tool, since you can also apply their principle, for example, where so-called bit drills are used, so drill whose shaft is soldered or otherwise secured in a hexagonal coupling section, similar to how one knows it from a bit ago. Analogously the same applies z. B. for appropriately designed grinding or scraping tools with which, for example, soft wood can be "milled".

The magazine body 7 is rotatably mounted in a magazine sleeve 9. This magazine sleeve 9 is preferably made of plastic, but it does not have to be transparent. The magazine sleeve 9 in turn has at least one window 10, via which the user in operation, for. B. when changing bits, a direct view and manual access to the magazine body 7 and usually on the window has.

The magazine sleeve 9 is provided with at least one, preferably two, often diametrically opposite latching tongues 11. These locking tongues serve to ensure that the magazine sleeve 9 can lock in its fully inserted and in its fully extended position relative to the housing or stops, so that they once in one of the two positions (ready-to-work position or WerkzeugwechselPosition) brought, does not accidentally slip out of the relevant position.

In addition, the magazine sleeve 9 is provided with at least one slide stop 11a, here in the form of a single stop projection. When installed, this prevents at least one slide stop 11a that the magazine sleeve is pulled out beyond a certain position out of the housing main part 5a, 5b.

The magazine sleeve 9 is preferably provided along its outer periphery with guide means with which it realizes a sliding guide together with corresponding guide means of the housing main body. These guide devices are designed in the form of at least one guide rail 12 on each one of two opposite sides, the corresponding guide channels 12b run along. In the embodiment gem. Fig. 3 two guide rails 12 per side are provided, which run here in the right and in the left housing main part 5a, 5b mounted on the inside guide channels 12b, which can be seen at least on the left housing main part 5b.

The magazine sleeve 9 is equipped with a usually central bearing tube 15, of which in Fig. 3 only one part can be seen, namely the part which can be seen through the window 10 provided in the magazine sleeve 9. The bearing tube 15 has on its side facing the drive shaft 4 a freely projecting end and is connected at its opposite end to the wall portion of the magazine sleeve, which partially closes the end face of the magazine sleeve.

The bearing tube 15 preferably has a dual function. The bearing tube 15 forms with its outer peripheral surface a bearing journal on which the magazine body 7 is rotatably supported. At the same time, the inner hollow bearing tube 15 forms with its inner circumferential surface a bearing which rotatably supports the drive shaft of the tool magazine unit, which is to be described in more detail below, and at the same time receives the coupling.

In that regard, it should be noted that in Fig. 3 can be seen on the magazine sleeve 9 of the frontal drive shaft outlet 14. The drive shaft outlet 14 is the end of the inner opening that passes through the drive shaft bearing tube 15.

In the inner opening of the bearing tube 15, a coupling sleeve 16 is inserted. The coupling sleeve 16 is preferably held in the direction of the axis of rotation D movable in the bearing tube 15, wherein the bearing tube 15 is designed so that the coupling sleeve 16, the bearing tube 15 can not leave in the direction of the output shaft 4 of the drive. The coupling sleeve is biased in the direction along the axis of rotation D by a coupling spring 18 and is movable in the direction along the axis of rotation 10th

The clutch spring 18 is supported on the one side on the end face of the coupling sleeve 16 and on the other side on the end face of the bearing sleeve 17. The bearing sleeve 17 is preferably fixedly connected to the inner circumference of the bearing tube 15, namely ideally by pressing or injecting into the bearing tube 15. The preferably made of metal bearing sleeve 17, which has been pressed in the present case, can provide a better Halt at its outer periphery have wedge-like teeth that cut into the bearing tube.

The bearing sleeve 17 rotatably receives the drive shaft of the tool magazine unit, which is identified here by the reference numeral 19.

The drive shaft 19 is in turn preferably in one piece from a coupling pin 20 having a non-circular circumferential profile, a preferably round, the bearing shaft portion 21 and a preferably integrally connected thereto pinion 22. In addition, the output shaft 19 is connected to a bearing pin 23, with the she in operational, d. H. is stored in a trunnion or recording ready state in a journal receptacle 24 which is an integral part of the carriage 25. The latter, because the bearing pin receptacle 24 is either pressed into a corresponding bore of the carriage or is encapsulated with the material of the carriage or glued.

In addition, a tool holder 28 is present, which is flat inside if hollow. The clear, not completely round inner cross-section of the tool holder corresponds to the outer cross section of a bit plus the game, which is required for a trouble-free bit change is possible. The tool holder is preferably connected to an integrally formed gear, which meshes with the pinion 22 of the output shaft 19.

The tool holder 28 is rotatably supported on two sides. On the one hand, it runs in a preferably metal bearing sleeve 27, which in turn is inserted into the pressure pin outlet 13 of the magazine sleeve 19 which permits the passage of the tool pressure pin 15. Again, the attachment can be done by pressing, by gluing or by molding. On the other hand, the tool holder 28 runs in a second, also preferably metal bearing sleeve 29. This second bearing sleeve 29 is in turn an integral part of the carriage 25. It is preferably pressed into the carriage 25 or encapsulated with the material of the carriage 25.

After all, it should be noted that the tool magazine unit preferably comprises the magazine body 7, the magazine sleeve 9, the coupling sleeve 16, the bearing sleeve 17, the clutch spring 18, the output shaft 19 and the tool holder 20 as main components.

The tool magazine unit is firmly connected to the carriage 25 to be described in more detail below, for. B. with the help of screws. In order to carry out a tool change, the tool magazine unit is moved together with the carriage relative to the tool pressure pin 5 in the direction parallel along the axis of rotation D translationally, or preferably pulled forward from the housing main body 5a, 5b. This results in a sequence of movements when loading, reminiscent of the Nachladebewegung a pump gun.

The sled

The carriage 25 is in turn slidably guided on the outside of the housing main body, which here consists of the right housing main body 5a and the left housing main body 5b.

For this purpose, the carriage preferably has two ideally diametrically opposed slide tongues, namely a right slide tongue 26a and a left slide tongue 26b. The slide tongues 26a and 26b are preferably designed so long that they still with at least 40%, more preferably at least 50% of their total length (measured in the direction parallel to the rotation axis D) engage over the housing main body or with him at least pulled out of the housing main body magazine body to interact. The slide tongues 26a, 26b are relatively wide measured in the circumferential direction, namely preferably at least 15 mm. In the radial direction, the slide tongues are relatively flat and preferably have in this direction predominantly a thickness of not more than 5 mm.

The slide tongues 26a, 26b preferably form a drawer-like guide with the outer surface of the housing main part.

For this purpose, they in turn run in outer guide grooves 30a, 30b of the housing main part 5a, 5b. These guide grooves are attached to the outer circumference of the housing or the main body parts. They form with respect to the other, surrounding surface of the housing main part a recess which, viewed in the radial direction, preferably accommodates at least the predominant part of the respective slide tongue. The slider tongues thus fit substantially flush in the course of the surface of the housing main body when carriage 25 is driven in the screwing position.

The guide grooves 30a and 30b are preferably dovetailed or equipped with a comparable undercut. The slide tongues 26a, 26b are in any case designed so that they are guided in the respective guide not only in the direction parallel to the axis of rotation D, but also held in the radial direction, which in the Fig. 3 is indicated by the arrows P.

For this purpose, it may be useful for the slide tongues to have edge strips RL which engage in a form-fitting manner in the correspondingly undercut left and right edges of the respective outer guide groove 30a, 30b.

Preferably, in the groove bottom of the outer guide grooves 30a, 30b, at least one, preferably a plurality of ball seats 31 are provided, which usually have the shape of a ball socket, which provides the ball hold, ideally without hindering their rotational mobility. In the present case, two ball seats 31 are provided along an alignment in each of the outer guide grooves. The corresponding balls, which are used in these ball seats 31 are in the Fig. 3 designated by the reference numeral 32.

These two balls are, when the carriage 25 assumes its working position, preferably viewed in the radial direction below the gripping surface, which is offered to the user to slide back and forth of the carriage. This grip surface can be visually highlighted so that the user intuitively accesses it correctly. In Fig. 3 This grip surface is executed in the form of a number of lamellae, which together form a double arrow, which visualizes the intended displacement of the carriage 25.

In each case, the relevant slide tongue 26a or 26b rolls on the or these balls. Because of this, even when the user grips tightly and applies a relatively large force in the radially inward direction to the slider tabs 26a, 26b, the slider tabs still slightly move in the outer guide grooves.

It is noteworthy that on the inside of the slide tongues preferably each have a Kugelführungsnut 33 is mounted in which the balls in turn roll on the inside of the slide tongues 26a, 26b.

It is also noteworthy that the slide 25 with its large frontal faceplate on the entire surface of the Front side of the right and left housing main part is supported, so that the carriage 25 is stably supported in screw-ready position. The carriage 25 does not have to remove large pressure loads anyway since these are removed via the tool pressure pin 5, which is firmly supported on the gearbox 2.

It can be clearly seen that the slide tongues 26a, 26b generally serve on the one hand to improve the guidance of the carriage 25 and of the tool magazine unit or even to take over at least the predominant part of the guide of the tool magazine unit, at least in the position enabling the tool change.

In some cases, it can be said that the magazine body 7 is preferably guided in a double sliding movement, namely firstly via the magazine sleeve 9 on the inside of the housing main part and secondly via the slide tongues 26a, 26b on the outside of the housing main part.

The kinematics of the drive and the tool change

If one imagines the whole in schububfertigem, unexploded state, then it is so that the tool pressure pin 5 passes through a tool receiving chamber of the magazine body 7, exiting through the Drucklagerauslass 13 from the magazine sleeve 9 and into the interior of the tool holder 28 toward or this comes up.

In this case, in the direction of the axis W seen in front of the tool pressure pin 5, a bit, a drill or the like., Which is supported with its free, the blade facing away from the end against the tool pressure pin 5. The tool pressure pin 5 may not turn. However, the tool holder rotates 28. Since its inner profile corresponds to the outer profile of the bit shaft, rotates the relevant bit together with the tool holder 28 and receives in this way his working torque mediates.

• In schraubfertigem Zustand ragt die Antriebswelle 4 durch den optional vorhandenen Haltering 6 hindurch bis in die Kupplungshülse 16 hinein. Die Antriebswelle 4 füllt das Innere der Kupplungshülse 16 jedoch nur teilweise aus. Der andere Teil des Inneren der Kupplungshülse 16 wird durch den Kupplungsstift 20 der Abtriebswelle 19 der Werkzeugmagazineinheit ausgefüllt. Auf diese Art und Weise wird die Antriebswelle 19 drehfest mit der Abtriebswelle 4 des Antriebs verbunden und zur Rotation gezwungen, sobald der Antrieb in Gang gesetzt worden ist. Über ihr Ritzel 22 treibt dann die Antriebswelle 19 die Werkzeugaufnahme 28 an, indem sie mit deren vorzugsweise integralem Zahnrad kämmt.

The drive of the tool holder 28 proceeds as follows:

• In schraubfertigem state, the drive shaft 4 extends through the optional existing retaining ring 6 through into the coupling sleeve 16 in. However, the drive shaft 4 fills the interior of the coupling sleeve 16 only partially. The other part of the interior of the coupling sleeve 16 is filled by the coupling pin 20 of the output shaft 19 of the tool magazine unit. In this way, the drive shaft 19 is rotatably connected to the output shaft 4 of the drive and forced to rotate as soon as the drive has been set in motion. About its pinion 22 then drives the drive shaft 19, the tool holder 28, by meshing with their preferably integral gear.

If you pull the carriage 25 for the purpose of tool change the axis of rotation D along and moves so that connected to the carriage 25 magazine sleeve 9 out of the housing main part out, then the coupling sleeve 16 comes into operation. It is namely deducted from the output shaft 4 of the drive, since the coupling sleeve 16 moves together with the magazine sleeve 9 and the carriage 25 transversely forward. In this way, the magazine body 7 is then moved so far forward that the tool pressure pin 5 is first pulled out of the interior of the tool holder 28 and finally even pulled out of the tool holder chamber of the magazine body 7 - until now only on the free end face of the tool pressure pin 5 adhering screw bit etc. remains in the tool chamber.

As a result, the magazine body 7 is rotatable and thereby takes the previously used screw bit in the circumferential direction. About the window 10 in the magazine sleeve, which is preferably mounted in a corresponding manner on the underside of the magazine sleeve not visible here, the user can rotate the magazine body 7 with his fingers and can select a different screw-bit in this way and in bring an escape with the tool pressure pin 5.

As soon as thereafter the carriage 25 together with the magazine sleeve 9 is again pushed along the axis of rotation D in the direction of the drive 3, the magazine body 7 is first shifted again so that the tool pressure pin penetrates into one of its tool chambers and the screw bit located there is in front of it pushes until he finally leaves the tool chamber via the passage 13 and is inserted into the interior of the tool holder 28 lying in alignment with it. Finally, the tool push pin usually pushes at least a little bit into the tool holder 28, but this is not mandatory.

How the clutch works is relatively easy to explain. It may of course be that the user in a moment in which the carriage 25 is pulled out and is in tool change position, the electric motor 1 is actuated, whereupon the output shaft 4 changes its position. If, in such a case, the slide is pushed back into its screwed position, then the output shaft 4 may not be able to immediately penetrate into the interior of the coupling sleeve 16 again. If the coupling sleeve 16 were rigidly fastened, then the slide 25 could not now be completely brought into its screwed position, which is certainly not easily accepted by the user. This is remedied here by itself in such a case, the coupling sleeve 16 is displaced against the action of the clutch spring 18 in the direction parallel to the axis of rotation D. In this way, the coupling sleeve 16 is biased relative to the output shaft 4. Pressing now the trigger of the screwdriver and sets in this way the engine 1 in motion, then the output shaft 4 will rotate for a brief moment, until their profile comes to rest in alignment with the inner profile of the coupling sleeve 16 and the coupling sleeve 16 is then pushed under the action of the spring 18 on the outer profile of the drive shaft 4, that is automatically coupled.

The indexing

It is also worth noting that the magazine body 7 is preferably provided with an indexing, which ensures that the magazine body can always be located only in such a position in which the tool pressure pin 5 can pass through a tool chamber unhindered. For this purpose, for example, the magazine sleeve 9 may be provided with at least one, preferably at least two guide channels 34, each receiving an Indexierkugel 35 and an Indxierfeder 36 (usually a compression spring). The compression spring biases the Indexierkugel 35 against a portion on the front side of the magazine body 7, which is provided with locking recesses, which are used to bring the magazine body by means of Indexierkugeln at the end of its respective rotation in each case in a position in which one of his Tool receiving chambers is in a position in which the tool pressure pin 5 can be freely inserted into the relevant tool chamber. The profile used for indexing can, but need not be, wavy. It can also be arranged at regular intervals latching recesses into which the balls come to hold the magazine body 7 each in a preferred position. Of course, instead of the Indexierkugeln 35 and other indexing be used, for example, small bolts.

• Der Werkzeugdruckstift 5 ist zumindest in axialer Richtung unbeweglich relativ zu dem Gehäusehauptteil befestigt.

Summing up the entire facts, one can say that not least the following points are essential:

• The tool pressure pin 5 is fixed at least in the axial direction immovable relative to the housing main body.

There is a carriage 25, with the aid of which the magazine body 7 in the course of a tool change in the direction parallel to the rotation axis D can be moved.

The tool holder is part of the carriage.

The drive shaft 19 passes through the magazine body 7 and is detachably connected to the output shaft 4. The connection is released when the carriage is in the tool change position. The connection is made when the carriage is in the screwed position.

THE SECOND EMBODIMENT

The Fig. 4 to 7 show a second embodiment of the invention.

With the exception of the guide of the magazine sleeve 9 and the slightly differently proportioned housing, the second embodiment does not differ from the first embodiment. Apart from the changed leadership are not least the inner workings and in particular the drive, the indexing of the magazine body, its rotation and the fundamental displaceability of the magazine body after "Pumpgun-Art" as well executed, as in the first embodiment, so that the described and in particular also the things that the Fig. 3 also applies to the second embodiment.

Based on Fig. 6 It can easily be seen that the self-rotatable magazine sleeve 9, which is also rotatably accommodating the magazine body 7, is guided with its outer circumferential surface on the inner surface of the housing main parts 5a, 5b by means of a sliding guide.

The components which have been referred to as slide tongues 26a, 26b in the first embodiment are "stunted" in this second embodiment. They now only form gripping tabs 37, usually without their own guide function relative to the respective housing main part. At these grips fingers find support to pull on the cap 38 and thereby move the magazine sleeve 9 together with the magazine body 7 out of the housing in the tool change position.

The already mentioned slide guide with the aid of which the magazine sleeve 9 is guided on the housing main parts 5a, 5b, preferably consists of a plurality of slide strips 39, which are designed on the outer peripheral surface of the magazine sleeve 9 as in radially outward direction over their surroundings raised / protruding areas. Each of the wear strips slides in a guide strip 40 formed on the inner circumferential surface of the housing main parts 5a, 5b between two guide rails 40 raised in a radially inward direction, which form a guide channel 41 between them. Each guide channel 41 carries the slide strip 39 received by it on three different sides and thus ensures good support of the magazine sleeve 9 on the housing main parts 5a, 5b. The slide strips 39 are each provided at its end facing the handle with a stopper projection 42, which faces away from the handle end of the. With a complementary projection respective guide channels 41 positively cooperates and determines the maximum extension length of the magazine sleeve. Ideally, four sliding strips 39 are provided on the magazine sleeve 9, which are received on each housing main part 5a and 5b by two guide channels 41.

In addition one can on the hand of the FIGS. 6 and 7 clearly recognize that the magazine sleeve is optionally additionally equipped with at least one, here even two cantilevered as a single bending beam locking arms 43. These bear ideally at their end in each case a locking member 44, here for example two spaced-apart humps, between which a detent recess 45 is formed. This locking member always snaps when the magazine body 9 is fully inserted into the housing main parts 5, 5b, in a complementary locking member, which is attached to the opposite housing main part 5a, 5b. As a result, the magazine body 9 is positively locked against the housing main parts 5a, 5b.

In order to create a solid as possible and also in continuous operation not fatiguing latching connection, the at least one complementary locking member on the side of the housing main parts 5a, 5b preferably formed as a metal leaf spring 46 which can snap into its associated detent member on the magazine sleeve, see. Fig. 7 , Ideally, the leaf spring 46 is set for this purpose at its two ends on the respective housing main part 5a or 5b and forms it from its center a locking cams.

It is also noteworthy that the magazine sleeve 9, the transmission 2 or at least the majority of the transmission 2 engages over its outer circumference when the magazine sleeve 9 is completely inserted into the two housing main parts 5a, 5b. Based on Fig. 7 It is possible to recognize what is meant here. This conveys a high stability with a very compact construction.

It is also noteworthy that in at least one or better two housing main parts 5a, 5b, a preferably common solid 47 is formed, which ideally accommodates a transparent housing section. The window or said "disc" allow even with completely inserted into the housing main parts 5a, 5b cartridge sleeve through the complementary window through a view of those transparent magazine body, into the region of one or preferably more tool receiving chambers into it. Not least then, if for example marked with a colored thread identification tool inserts are kept ready in the tool chambers, the user can already before pulling out of the magazine body 9 easily get an idea of what kind of tool insert is kept in the adjacent tool holding chambers.

Final, general remarks

• Werkzeugmaschine, die sich dadurch auszeichnet, dass der Gehäusehauptteil (5a, 5b) an seiner Außenoberfläche mindestens eine Führungsnut (30a, 30b) zur führenden Aufnahme einer Schieberzunge (26a, 26b) aufweist.
  und/oder
• Werkzeugmaschine, die sich dadurch auszeichnet, dass die mindestens eine Führungsnut (30a, 30b) einen Hinterschnitt bildet, derart, dass die von ihr aufgenommene Führungszuge (26a, 26b) in alle Richtungen senkrecht zu ihrer Bewegungsrichtung von der Führungsnut gehalten wird.
  und/oder
• Werkzeugmaschine, die sich dadurch auszeichnet, dass am Grund der mindestens einen Führungsnut (30a, 30b) mindestens eine, vorzugsweise mindestens zwei meist metallene Lagerkugeln gehalten sind, auf der der dieser Führungsnut zugeordneten Führungszunge (26a, 26b) abrollt, wobei die Positionierung der einen oder mehreren Lagekugeln vorzugsweise so gewählt ist, dass sie bei schraub- oder bohrbereitem Werkzeug in radial-einwärtiger Richtung unter einem als Hauptgrifffläche gekennzeichneten Abschnitt der Führungszunge (26a, 26b) liegen.
  und/oder
• Werkzeugmaschine, die sich dadurch auszeichnet, dass die mindestens eine Führungszunge (26a, 26b) auf ihrer Innenseite eine Führungsnut (33) für die Kugel oder Kugeln (31) aufweist.
  und/oder
• Werkzeugmaschine, die sich dadurch auszeichnet, dass der Indexiermechanismus aus mindestens einer Indexierfeder (36) besteht, die sich mit einem Ende vorzugsweise von innen gegen die Frontplatte des Schlittens (25) oder der Kappe (38) abstützt und mit ihrem anderen Ende einen in einem durchgehenden Führungskanal (34) der Magazinhülse (9) verschiebbar gehaltenen Indexierkörper - vorzugsweise in Gestalt einer Indexierkugel (35) - gegen den Magazinkörper (7) drückt, der seinerseits Rastvertiefungen aufweist.

Protection is also for a machine tool - and in particular such gem. Exemplary embodiment 1 - which has the features of at least one of the claims and preferably at least of Claim 1 and furthermore has the following features:

• Machine tool, which is characterized in that the housing main part (5a, 5b) on its outer surface at least one guide groove (30a, 30b) for leading receiving a slide tongue (26a, 26b).
  and or
• Machine tool, which is characterized in that the at least one guide groove (30a, 30b) forms an undercut, such that the guide strips (26a, 26b) received by it is held in all directions perpendicular to its direction of movement of the guide groove.
  and or
• Machine tool, which is characterized in that at least one, preferably at least two mostly metal bearing balls are held at the bottom of at least one guide groove (30a, 30b) on which the guide groove associated guide tongue (26a, 26b) rolls, the positioning of the one or more position balls is preferably selected so that they are in screw-in or drill-ready tool in the radially inward direction below a marked as the main grip surface portion of the guide tongue (26 a, 26 b).
  and or
• Machine tool, which is characterized in that the at least one guide tongue (26a, 26b) has on its inside a guide groove (33) for the ball or balls (31).
  and or
• Machine tool, which is characterized in that the indexing mechanism consists of at least one Indexierfeder (36), which preferably bears with one end from the inside against the front plate of the carriage (25) or the cap (38) and with its other end in one continuous guide channel (34) of the magazine sleeve (9) slidably held Indexierkörper - preferably in the form of an indexing ball (35) - presses against the magazine body (7), which in turn has locking recesses.

On the one hand, regardless of already established claims and on the other hand, but also in combination with already established claims and / or passages from the description protection for a machine tool with a magazine body (7) is claimed, which can accommodate or has taken several tools or tool inserts in and which consists of a first housing portion, which extends parallel, preferably substantially circular or oval-cylindrical, along the working axis of rotation of the machine tool and from the obliquely to a two, designed as a handle housing section, the magazine body is part of a drawer, which is made the pull of the handle facing away, open end side of the first housing section can pull out to bring the magazine body in a tool change position in which it is preferably completely outside the first housing portion, and which can be inserted into the first housing section l sst to introduce the magazine body preferably completely in the first housing portion so as there is in its working position, said tool holder (28) is preferably part of the drawer and can be moved back and forth with here.

Ideally, the drawer comprises or comprises: a magazine sleeve (9), which is displaceably guided on the first housing section (usually consisting of the housing main parts 5a, 5b, which can also form the handle) and accommodates rotatably the magazine body (7), and a cap (38), a tool receiving means (28) passing through the latter, and preferably those of Fig. 2 shown components that serve to drive the tool holder (28) and preferably the above-mentioned indexing mechanism.

LIST OF REFERENCE NUMBERS

1

engine

2

transmission

3

drive

4

drive shaft

5

Tool pusher pin

5a

Case body

5b

Case body

6

retaining ring

7

magazine body

8th

Window in the magazine body

9

magazine sleeve

10

Fixed in the magazine slide

11

Catching tongue of the magazine carriage

11a

sliding stop

12

Guide rail of the magazine carriage

12b

Inner guide channel

13

Passage for the tool pressure pin

14

Drive shaft passage

15

Bearing tube for the drive shaft and the coupling

16

coupling sleeve

17

bearing sleeve

18

clutch spring

19

Drive shaft of the tool magazine

20

Coupling pin of the drive shaft

21

shaft section

22

pinion

23

pivot

24

Journal recording

25

carriage

26a

sliding tongue

26b

sliding tongue

27

First bearing sleeve of the tool holder

28

tool holder

29

Second bearing sleeve of the tool holder

30a

External guide groove

30b

External guide groove

31

ball seat

32

Bullet

33

ball guide

34

guide channel

35

Indexierkugel

36

indexing spring

37

handle tongue

38

cap

39

Slide Strip

40

guide rail

41

guide channel

42

stopping projection

43

detent arm

44

detent member

45

catch recess

46

leaf spring

47

window

D

Rotary axis of the drive

W

Axis of the tool pin

P

Arrow showing the grip of the slider tongue

RL

Edges of the slide tongues

Claims (15)

Machine tool, in particular in the form of a hand tool machine, with a housing main part, a tool receptacle (28) rotating in operation about a work axis, a drive (3) and a magazine body (7) for receiving different tools, characterized in that the magazine body (7) opposite the housing main part (5a, 5b) in the direction parallel to the working axis of rotation (D) can be moved back and forth, wherein the machine tool is preferably designed such that the drive (3) drives a drive shaft (19) which engages through the magazine body (7) and releasably connected to the output shaft (4) of the drive (3), wherein the machine tool is designed so that the connection between the drive shaft (19) and the output shaft (4) is released when the carriage or the magazine body ( 7) is in change position and is made when the carriage or the magazine body (7) is in the screwed position. Machine tool according to claim 1, characterized in that the magazine body (7) is rotatably mounted in a carriage (25) or in a magazine sleeve (9), the or by means of at least one sliding guide in the direction parallel to the axis of rotation (D) movable is mounted on the housing main part (5a, 5b). Machine tool according to claim 2, characterized in that the sliding guide is an outer guide or comprises an outer guide, which consists of at least one preferably at least two ideally diametrically opposite slide tongues (26a, 26b) on the outer surface of the housing main part (5a, 5b) guided or that the sliding guide is preferably exclusively an inner guide, preferably in the form that the magazine sleeve (9) on its outer peripheral surface has a sliding guide which interacts with the inner peripheral surface of the housing main parts, such that the magazine sleeve of the housing main parts (5a, 5b) out becomes. Machine tool according to one of the preceding claims, characterized in that the housing main part (5a, 5b) is open on its side facing the tool side and only by the carriage (25) or on the magazine sleeve (9) attached or integrally formed cap ( 38) is closed, which complements or the missing part of the housing here. Machine tool according to one of the preceding claims, characterized in that the magazine body (7) is part of a tool magazine unit, which is preferably in turn in the interior of the housing main part (5a, 5b) is guided translationally and / or characterized in that the tool magazine unit a magazine sleeve (9) includes and a rotatably mounted in the magazine sleeve magazine body (7). Machine tool according to claim 5, characterized in that the tool magazine unit comprises a coupling for coupling and uncoupling the drive shaft (4) of the drive (3), wherein the coupling is preferably a fully positive-locking clutch. Machine tool according to one of the preceding claims, characterized in that the coupling comprises a slidingly movable mounted coupling sleeve (16) which is designed so that the tool magazine unit even then can be completely inserted into the housing main body, when the drive shaft (4) and the coupling sleeve (16) are such that their profiles are not latching due to different rotational positions, so that the drive shaft initially can not be inserted into the interior of the coupling sleeve and instead, the coupling sleeve (16) displaced. Machine tool according to claim 7, characterized in that the coupling sleeve (16) can be biased by a coupling spring (18) in the direction of the drive shaft (4) that the first not to the drive shaft (4) coupled coupling sleeve (16) automatically coupling on the drive shaft (4) is pushed, as soon as the drive shaft is driven. Machine tool according to one of the preceding claims, characterized in that the tool magazine unit comprises a preferably centrally through the output shaft (19), one end preferably in addition in the carriage (25) or, in the absence of a carriage, in a closing of the frontal opening between the housing main parts (5a, 5b) ertüchtigten cap (38) is rotatably mounted and / or the other end is preferably rotatably mounted in the magazine sleeve (9). Machine tool according to one of the preceding claims, characterized in that the tool magazine unit comprises a tool holder (18) having one end preferably in the carriage (25) or its front panel or, in the absence of a carriage, in a closing of the front opening between the Housing main parts (5a, 5b) ertüchtigten cap (38) is rotatably mounted and / or whose other end is preferably rotatably mounted in the magazine sleeve (9). Machine tool according to one of the preceding claims, characterized in that the carriage (25) consists of a front plate which closes at the completely in the housing main part (5a, 5b) inserted slide the frontal opening of the housing main part (5a, 5b) and preferably two of the front plate outgoing guide tongues (26a, 26b), wherein the front plate is penetrated by the tool holder (28) or that the magazine sleeve (9) with a for closing the frontal opening between the housing main parts (5a, 5b) ertüchtigten cap (38) is connected , which is penetrated by the tool holder (28), wherein the cap (38) preferably has at least one better two tabs (37) which engage over one or both housing main parts on the outside, preferably only locally, not on the entire circumference and / or at least by 7 mm in the direction parallel to the longitudinal or rotational axis of the machine tool. Machine tool according to claim 16, characterized in that the front plate or cap (38) is fixedly connected to the tool magazine unit, preferably by screwing or latching. Machine tool according to one of the preceding claims, characterized in that the magazine body (7) is translucent at least in the region of the outer periphery of its tool receiving chambers to make recognizable whether a chamber is occupied and / or the magazine body (7) has material-free window, respectively allow a direct view into the relevant tool chamber. Machine tool according to one of the preceding claims, characterized in that the magazine sleeve (9) has at least one, preferably at least two material-free window in its outer peripheral surface, which allow grasping the magazine body (7) to rotate it and / or at least one of the housing main parts better, both together, form a preferably closed with transparent material or an unlocked window, which is dimensioned and arranged so that it is aligned with a window in the magazine sleeve, when this occupies its working position, so that through both windows, the view on the Magazine body (7) is free. Machine tool according to one of the preceding claims, characterized in that between the magazine sleeve and the magazine body a preferably acting on an end face of the magazine body and usually on the outer circumference of the magazine body indexing mechanism is installed, with the aid of the magazine sleeve can be rotated in preferred positions, in each case one Tool holding chamber is positioned in front of the tool pressure pin (5), that the tool pressure pin can be freely inserted into the tool chamber.

Images