EP1414621B1 - Rotating machine, approximately in the form of a hand drill, a percussion drill, a drill hammer or a battery screwdriver - Google Patents

Abstract

The invention relates to a tool-receiving element, the tool-clamping device thereof being directly integrated into the rotating machine. A multiple-edge longitudinal recess ( 21,121,221 ), especially a hexagonal recess, extends into the drive shaft ( 18,118,218 ) from the output-side front end thereof. A clamping sleeve ( 25,25',125,225 ) is received on the section of the drive shalt comprising the tool-receiving element, in the form of a tool-clamping device, by which means at least one locking element ( 24,124,224 ) received in a radial recess penetrating the shell of the tool-receiving element can be actuated in a locking position protruding radially into the tool-receiving element, and can be released in an unlocking position for radial yielding.

Description

The invention relates to a lathe in the form of a hand drill, a percussion drill, a hammer drill or a cordless screwdriver having a drive motor received within a machine housing and a drive shaft operatively connected to the motor housing, and a tool receptacle having a tool clamping device for detachably coupling one Drill, Schraubendreherbits or a similar tool with the drive shaft, wherein the tool holder is integrated with the tool clamping device directly into the lathe by a polygonal longitudinal recess, in particular a hexagonal recess hineinerstreckt into the drive shaft from the abtriebseitigem end, said on Tool receiving portion of the drive shaft as a tool clamping device a clamping sleeve is received, by means of at least one in a jacket of the tool holder penetrating Radialausnehmu ng received latching element in a radially projecting into the tool holder locking position actuated and can be released for radial deflection into an unlocking position, and wherein the clamping sleeve is formed as between the locking position and the unlocking axially actuated sliding sleeve.

Such a lathe is already out of the U.S. Patent 5,013,194 A1 previously known. The document more specifically discloses the tool holder of such a lathe, which has a multi-edged shaft recess for receiving a tool, in which a similar tool can be inserted. A latching of the tool via a circumferential recess of the tool shaft, in which engage Verrastungskugeln, which are held in a locking position of a rotatably connected to the tool holder, axially displaceable sliding sleeve.

Other lathes of this type are known, but with the lack of cumbersome handling especially with regard to a quick and easy to carry out tool change.

So hand drills are common and percussion drills basically equipped with key-operated sprocket chucks, by means of which mainly drilling tools with round shafts are tensioned. The operation of such chucks is linked to the availability of a suitable key and also cumbersome and time consuming.

Also known are such machines with so-called quick chucks, which serves for actuating the Spannbakken a clamping sleeve with fine thread, however, only the application of moderate clamping forces and also a likewise allow time-consuming clamping and release of tools. In particular, however, this clamping technique implies considerable accident risks insofar as in practice - in contradiction to the applicable accident prevention regulations - when changing tools for clamping a tool shaft inserted into a chuck, the running machine is frequently used and the user holds the clamping sleeve of the chuck with one hand.

Characteristic of the known chuck is that they are provided with sprockets or improved grip mediating longitudinal grooves, corrugations or the like, the accident hazards in running machines.

By contrast, a lathe of the aforementioned type and purpose with a comparison with the prior art improved tool holder and tool clamping device is to be created by the invention, which significantly reduces the risk of accidents and simultaneously prevents damage to the workpiece by the rotating drill chuck in the event of a breakthrough drilling tool enter.

This object is achieved according to the invention in that in the lathe according to the preamble of claim 1, the tool holder is integrated with the tool clamping device directly into the lathe by hineinerstreckt a polygonal longitudinal recess, in particular a hexagonal recess in the drive shaft of the abtriebseitigem front end , And that on the tool receiving portion having the drive shaft as a tool clamping device, a clamping sleeve is received by means of the at least one latching element accommodated in a radial recess penetrating the casing of the tool holder can be actuated into a locking position protruding radially into the tool holder and can be released for radial deflection into an unlocking position.

The lathe according to the invention is suitable and intended for clamping tools with one of the tool holder forming polygonal longitudinal recess adapted, in particular designed as a hex shank polygonal shaft with a circumferential locking groove engages in the clamped tool at least one actuatable by means of the clamping sleeve in its locking position Verrastungselement ,

Although even screwdrivers and Drehrichtungsaufstellbare hand drills are already known from the front end of the drive shaft in this hineinzerstreckenden hexagonal recesses in the unscrewed chuck Schraubendreherbits are inserted, but these machines are inserted screwdriver bits only held by a spring detent when inserting or pulling out a Bits are overcome by low axial forces and do not allow a real clamping of a tool.

Furthermore, the invention provides that the clamping sleeve is formed as between the locking position and the unlocking axially actuated sliding sleeve. This sliding sleeve can directly on the spigot into which the polygonal longitudinal recess hineinerstreckt as a tool holder, stored and part of a on the spigot be the tool holder axially displaceably guided actuating sleeve.

The sliding sleeve is also axially fixed to a rotationally fixed on the machine housing, but axially movable guided actuating sleeve, but rotatably connected to the latter. In particular, the actuating shaft of the tool clamping device can be accommodated on a housing neck projecting from the machine housing, surrounding the mounting journal of the tool mount on a part of its longitudinal extension.

The lathe according to the invention can also be designed so that the axially slidably received on the housing neck actuating sleeve in the locking position is axially fixed. As a result, a random displacement of the actuating sleeve, and thus the clamping sleeve, is prevented from the locking position.

Advantageous developments of the invention are specified in the subordinate claims.

Thus, an important development is characterized in that as a polygonal longitudinal recess in the drive shaft or a hineingestreckende from this spigot tool holder is limited in depth by a tapered centering cone for supporting and centering a matched counter-cone having tool shank end.

The arrangement of a centering cone in the depth of the tool holder conveys, in addition to the necessary axial support of a tool whose precise centering at the shaft end, which expediently cooperates with a centering of the shank spaced axially from the centering cone. An axially spaced from Zentrierkonus Schaftzentrierung a tool can be realized in a simple manner that serve as by means of the clamping sleeve between a locking position and an unlocking clamping elements actuated three detent balls which break through in the mantle of the receiving pin of the tool holder in the vicinity of its free end face and evenly distributed over the circumference arranged radial recesses are added.

Characteristic of such a trained tool holder and tool clamping device is a precise centering of the shaft end and spaced therefrom of extending to the actual tool shaft by engage in the locking position three evenly distributed over the circumference arranged detent balls in a circumferential groove of the tool shank.

Conveniently, the clamping sleeve is provided with locking boards for actuating and locking in these the detent balls in their locking positions and the detent boards should be formed as spherical caps, which are adapted to the detent balls. In order to ensure a particularly secure locking of a tensioned tool, the locking members of the clamping sleeve can also be arranged on spring fingers which protrude axially from the clamping sleeve. May be limited, the radial mobility of the spring fingers by the latter outside enclosing and possibly supporting stop means.

The axial locking of the locking sleeve and thus the clamping sleeve in the locking position is realized in a preferred embodiment in that the axially fixedly connected to the clamping sleeve actuating sleeve is provided with at least one over the contact surface with the housing neck projecting guide projection and that this guide projection in a in Housing spigot extending guide groove engages, which is followed by a circumferentially extending locking portion, which allows a limited rotation of the actuating sleeve relative to the latter receiving housing socket in the locking position, wherein the guide projection enters the Arretierungsabschnitt and thereby mediates an axial fixation of the actuating sleeve. The guide projection of the actuating sleeve may expediently be at least one spring-loaded guide ball, which is received in a radial recess of the actuating sleeve.

According to another useful development, the axial displaceability of the sliding sleeve is limited by at least one in each case in a locking position and in the unlocking position engaging in a latching resilient locking cam in the lathe according to the invention, whereby a clear positioning of the sliding sleeve is realized in its two functional end positions.

In the notches, which engages in the respective end positions of the sliding sleeve of the locking cam, it may be axially spaced from each other in the receiving pin or in a latter surrounding and the actuating sleeve rotatably overlapping housing neck radially eingochene locking grooves act.

However, the sliding sleeve can also, according to another important embodiment of the invention, be actuated by means of an electromagnet which engages the axially fixed, but rotatably connected to the sliding sleeve actuating sleeve. This electromagnet can be designed to be double-acting, which thus allows actuation of serving as a clamping sleeve sliding sleeve from the unlocking position into the locking position and vice versa from the latter again in the unlocking position. The actuation of the sliding sleeve by means of an electromagnet can also take place against the action of a return spring.

Finally, a particularly important embodiment of the invention is characterized in that the receiving pin of the tool holder overlapped with the tool clamping device of a machine housing connected to the housing cover and thereby any access of an operator to the sliding or actuating sleeve is impossible.

The lathe according to the invention may be, for example, a cordless screwdriver, a hand drill, a percussion drill or even a hammer drill. The design as a hammer drill is characterized in that the tool holder, so the polygonal longitudinal recess is limited in depth by an axially movably received in the drive shaft plunger, which is sleeve-like and pointing to the tool holder side facing a constricting centering cone and is operatively connected to a pulsating axial drive.

The centering cone conveys, as already explained above, a precise centering of the shank end of a tool received in the tool holder and the pulsating axial drive may in particular be a pneumatic drive of the kind known in rotary hammers.

In the training as a hammer the tools to be used must have a circumferential detent groove whose width is greater than the axial extent of engaging in the locking latch in the latching detent element, so that such a tool within the width of the extension of the detent groove pulsating axial movements within the tool holder, which at a such pulsation is not involved, can perform.

Fig. 1

einen Akkuschrauber mit einer am abtriebseitigen Ende einer mit einem Antriebsmotor in Wirkverbin- dung stehenden Antriebswelle angeordneten Werk- zeugaufnahme und einer auf dieser aufgenommenen Spannhülse einer Werkzeugspanneinrichtung in ei- ner Seitenansicht,

Fig. 2

einen der Schnittlinie II-II in Fig. 1 entspre- chenden Längsschnitt durch den abtriebseitigen Bereich des Akkuschraubers mit der Werkzeugauf- nahme und der Werkzeugspanneinrichtung,

Fig. 3

einen Querschnitt gemäß der Schnittlinie III-III in Fig. 2 durch die Werkzeugaufnahme und die Werkzeugspanneinrichtung,

Fig. 4

in einer Ansicht wie in Fig. 2 einen Akkuschrau- ber mit einer abgewandelten Werkzeugspanneinrich- tung,

Fig. 5

analog zu Fig. 3 einen der Schnittlinie V-V in Fig. 4 entsprechenden Querschnitt durch die Werk- zeugaufnahme und Werkzeugspanneinrichtung der Ausführungsform gemäß Fig. 4,

Fig. 6

in einer Ansicht wie in den Fig. 2 und 4 einen Längsschnitt durch den abtriebseitigen Bereich eines Akkuschraubers, bei dem die Werkzeugspann- einrichtung eine nicht mitdrehend ausgebildete Betätigungshülse aufweist,

Fig. 7

einen Querschnitt gemäß der Schnittlinie VII-VII in Fig. 6 durch die Werkzeugaufnahme und die Schiebehülse der Werkzeugspanneinrichtung,

Fig. 8

eine zu Fig. 6 alternative Ausführungsform, bei der die Betätigungshülse in der Verriegelungspo- sition arretierbar ist,

Fig. 9

analog zu Fig. 7 eine der Schnittlinie IX-IX in Fig. 8 entsprechenden Querschnitt durch die Werk- zeugaufnahme und Werkzeugspanneinrichtung der Ausführungsform nach Fig. 8,

Fig. 10

eine Führungskulisse für die in der Verriege- lungsposition arretierbare Betätigungshülse mit Blick gemäß Pfeil X in Fig. 9 auf einen vorste- henden Gehäuseabschnitt,

Fig. 11

in einer Ansicht wie in Fig. 1 eine alternative Akkuschrauber-Ausbildung, bei der die Werkzeug- aufnahme und die Werkzeugspanneinrichtung in- nerhalb einer Gehäuseabdeckung aufgenommen sind und

Fig. 12

einen der Schnittlinie XII-XII in Fig. 11 ent- sprechenden Längsschnitt durch den abtriebseiti- gen Bereich des Akkuschraubers mit der Werkzeug- aufnahme und der Werkzeugspanneinrichtung.

Reference to the accompanying drawings, various embodiments of the lathe according to the invention will be explained below. In schematic views show:

Fig. 1

a cordless screwdriver having a tool holder arranged on the output end of a drive shaft operatively connected to a drive motor and a clamping sleeve of a tool clamping device held on the output side in a side view,

Fig. 2

one of the section line II-II in Fig. 1 Corresponding longitudinal section through the output side region of the cordless screwdriver with the tool holder and the tool clamping device,

Fig. 3

a cross section along the section line III-III in Fig. 2 through the tool holder and the tool clamping device,

Fig. 4

in a view like in Fig. 2 a cordless screwdriver with a modified tool clamping device,

Fig. 5

analogous to Fig. 3 one of the section line VV in Fig. 4 corresponding cross section through the tool holder and tool clamping device of the embodiment according to Fig. 4 .

Fig. 6

in a view like in the Fig. 2 and 4 3 a longitudinal section through the output-side region of a cordless screwdriver, in which the tool-clamping device has a non-co-rotating actuating sleeve,

Fig. 7

a cross section according to the section line VII-VII in Fig. 6 through the tool holder and the sliding sleeve of the tool clamping device,

Fig. 8

one too Fig. 6 alternative embodiment in which the actuating sleeve can be locked in the locking position,

Fig. 9

analogous to Fig. 7 one of the section line IX-IX in Fig. 8 corresponding cross section through the tool holder and tool clamping device of the embodiment according to Fig. 8 .

Fig. 10

a guide slot for the locking in the locking position actuating sleeve with view according to arrow X in Fig. 9 on a projecting housing section,

Fig. 11

in a view like in Fig. 1 an alternative cordless screwdriver training, in which the tool holder and the tool clamping device are housed within a housing cover and

Fig. 12

one of the section line XII-XII in Fig. 11 Corresponding longitudinal section through the output side area of the cordless screwdriver with the tool holder and the tool clamping device.

The in the Fig. 1 to 3 illustrated cordless screwdriver 10 has a housing 11, protruding from the approximately at right angles to the longitudinal extent of a handle 12 with a coupling shoe 13 for a releasably coupled battery 14. Within the device is a drive motor which can be switched on and off by means of an actuating switch 15 and by means of a switch 16 Drehrichtungsumschaltbar. About a gearbox as well as a by means of a housing 11 on the output side associated adjusting wheel 17 with respect to the torque to be transmitted adjustable slip clutch is operatively connected to the drive motor 18 of a drive shaft. The drive motor, the transmission and the slip clutch are not shown in the drawing and require no explanation, because such drive elements are well known in cordless screwdrivers.

Trained as a hollow shaft drive shaft 18 is led out of the housing 11 with the adjusting ring 17 and rotatably mounted in the housing 11 in a manner not of interest here, but axially fixed. It protrudes with a receiving pin 20 at the front end over the housing 11 with the adjusting ring 17. From the free end face of the receiving pin 20 extends in this a hexagonal longitudinal recess 21 as a tool holder for equipped with adapted hexagonal shanks tools. The hexagonal longitudinal recess 21 terminates in depth in a centering cone 22. In the vicinity of the housing 11 remote from the end of the receiving pin 20 whose shell of three uniformly distributed over the circumference arranged radial recesses 23 is broken in which latching balls 24 received as radially movable locking elements are.

On the above receiving pin 20 designed as a sliding sleeve 25 clamping sleeve is received axially displaceable. The sliding sleeve 25 is operable between a locking position and an unlocking position. In the locking position, which in the FIGS. 2 and 3 is shown, the detent balls 24 project radially into the hex recess 21 and are held by latching members 26 of the sliding sleeve 25 in this position. In contrast, in the advanced unlocking position of the sliding sleeve 25, the locking balls 24 in the sliding sleeve to the locking boards 26 axially subsequent radial recesses 27 dodge radially such that they no longer protrude into the formed by the hexagonal longitudinal recess 21 tool holder.

The latching boards 26 of the sliding sleeve 25 are adapted to the detent balls 24 and thus as Hohlkalotten -ausgebildet, that the locking balls are supported in the tensioned state of a tool areally on the locking boards.

The sliding sleeve 25 is positioned in the advanced unlocking position and in the axially spaced, retracted locking position by means of at least one resiliently mounted on the sliding sleeve locking cam 28 which engages in the respective end position in a radially inwardly inserted from the outside into the receiving pin 20 locking groove 29, 30.

The cordless screwdriver 10 is intended for clamping tools with a hexagonal shank and a centering cone arranged on the shank end and a ring groove extending at a distance from the centering cone. The distance between the circumferential groove in the tool shaft of the front end centering cone corresponds to the distance between the centering cone 22 at the end of the tool holder forming hexagonal longitudinal recess 21 and the detent balls 26, in which are arranged in the vicinity of the free end face of the receiving pin radial recesses 23.

The shank of such a tool can be inserted into the tool holder 21 when the sliding sleeve 25 is in the advanced unlocking position in which the locking balls can move radially out of the region of the hexagonal longitudinal recess 21 forming the tool holder. After the complete insertion of the shank of a tool, which is then supported with its centering cone on the inner centering cone 22 of the tool holder, the tool is in the tool holder by retracting the sliding sleeve in the from FIGS. 2 and 3 apparent locking position tensioned by the locking balls 24 engage in the circumferential locking groove of the tool shank.

In view of the tool centering by the cooperation of the end-end centering cone on the tool shank with the mating cone 22 in the depth of the hexagonal longitudinal recess 21 and the axially spaced centering by the engagement of the detent balls 24 in the circumferential locking groove of the tool shank whose precise centering is ensured in the tool holder.

The in the 4 and 5 illustrated embodiment differs from that in the FIGS. 2 and 3 shown cordless screwdriver characterized in that the latching boards 26 are arranged on three axially from the sliding sleeve 25 'forterstreckenden spring fingers 38 which can be limited in the illustrated locking position in the interest of a desirable tolerance compensation radially dodge. Limited is the spring travel of the spring fingers 38 by a latter radially encompassing stop shoulder 39th

The 6 and 7 illustrate in views similar to the FIGS. 2 and 3 an alternative embodiment of the tool holder and tool clamping device. In the 6 and 7 are for the same parts as in the Fig. 1 to 3 in each case increased by 100 reference numerals used.

The alternative embodiment according to the 6 and 7 also has a on the housing 111 with the adjusting ring 117 projecting spigot 120 with a hexagonal longitudinal recess 121 as a tool holder.

In the region of the front end of the receiving pin 120 whose shell is in turn distributed by uniformly distributed over the circumference arranged radial recesses 123, in which radially movable latching elements 124 are received as latching elements. On the equipped with the detent balls 124 end portion of the receiving pin, an axially displaceable clamping sleeve 125 is further included, the front locking boards 126 for locking the locking balls 124 has a protruding into the hexagonal longitudinal recess 121 locking position and is axially adjacent to the locking members provided with radial recesses 127 , in which in the unlocked position advanced clamping sleeve 125, the locking balls 124 can dodge radially.

The rotatably received on the receiving pin 120 and also designed as a sliding sleeve clamping sleeve 125 is not einstükkig trained in contrast to the first embodiment with an operating sleeve, but with an operating sleeve 125 'axially fixed, but rotatably connected, in turn rotatably on a receiving pin 120 on a Part of its longitudinal extension concentrically enclosing housing stub 132 is mounted axially displaceable. The rotatable connection of the operating sleeve 125 'with the clamping sleeve 125 can be effected via a sliding bearing, for example by means of engaging in a corresponding radial groove of the operating sleeve radial projection of the clamping sleeve, as in the upper half of Fig. 6 is shown, or by means of a ball bearing, as the lower half of the sectional view in Fig. 6 shows. Moreover, the control sleeve 125 'turn by means of one of these protruding resilient latching cam 128 in its two end positions, namely the in Fig. 6 illustrated clamping position and a contrast unlocked position, positionable by the locking cam axially spaced from each other in the projecting from the housing 111 and the receiving pin 120 on a portion of its longitudinal extension concentrically enclosing housing socket 132 pierced annular grooves engages.

The housing sleeve 132 axially movable, but rotatably received actuating sleeve 125 'has a projecting into a housing socket 132 longitudinal recess projecting cam 133 which actuates in the end positions of the sliding sleeve in each case one arranged at the ends of the elongated recess electrical contact 134, 135. These contacts enable turning on the lathe only when a tool is properly tensioned in the tool holder.

Otherwise, in the embodiment of the 6 and 7 the gap between the clamping sleeve 125 and the rotatable but axially fixed connected control sleeve 125 'in the vicinity of the end remote from the machine housing protected by an O-ring 136 against the ingress of contaminants.

As in the first embodiment, the tool holder 121 is equipped in depth with a tapered centering cone 122 for centering the provided with a centering cone shank end of the tools to be used, however, arranged in contrast to the first embodiment, part of a in the depth of the tool holder axially movable Pestle 134 is. This plunger is in operative connection with a pulsating axial drive, such as a pneumatic drive previously known in rotary hammers.

The alternative embodiment according to the 6 and 7 is intended for the use of tools in which, as in conventional rotary hammers, spaced from a centering cone arranged at the shaft end circumferential annular groove has a width extension which is greater than the axial depth of engagement of the locking balls 124 in the locking position.

In the in the 6 and 7 illustrated embodiment is thus a cordless screwdriver, which is also used as a hammer drill and allows for a rotational movement of superimposed axial movement of a tensioned tool when using a pneumatic drive or otherwise pulsating driven plunger 134 in the context of the width of the extension arranged in the shank of a corresponding tool groove ,

The in the Fig. 8 to 10 illustrated embodiment differs from the above in connection with the 6 and 7 explained embodiment in that the recorded on the housing neck 132 actuating sleeve 125 "has no cooperating with annular grooves of the housing neck locking cam, but the actuating sleeve 125" is in the in Fig. 8 Locking position shown axially locked. The axially fixedly connected to the clamping sleeve 125 actuating sleeve 125 '' is equipped with three at equal angular intervals distributed over the circumference arranged guide balls 140 which are received in Querausnehmungen 141 of the actuating sleeve and distributed under Federkraftbeaufschlagung in equally uniform over the circumference of the housing stub 132 'arranged Guide grooves 142 engage. These guide grooves extend over one of the axial movement of the actuating sleeve 125 "of the retracted Entriegelungsstellung in the advanced locking position corresponding longitudinal section axially and then buckle at the formation of Arretierungsabschnitten 143 at right angles in the circumferential direction. As a result, the actuating sleeve 125 "in the locking position by rotation relative to the housing neck 132 axially locked, because as a result of this rotation, the guide balls 140 reach the locking portions 143.

In the in the Fig. 11 and 12 In turn, the illustrated embodiments are again the same parts as in FIGS Fig. 1 to 3 the same reference numerals are used, but increased by 200.

As in the embodiment of the 6 and 7 is on the front part of a receiving pin 220 with the captured in radial recesses 223 detent balls 224 a collet 225 axially movably mounted and axially fixed, but rotatably connected to an actuating sleeve 225 ', which in turn on a receiving pin 220 on a portion of its length and extending from the housing 211 projecting housing sleeve 232 rotatably, but is mounted axially displaceable. The actuation of the clamping sleeve 225 between its locking position in which the locking balls 224 in the hexagonal longitudinal recess 221, which forms the depth of a clamping cone 222 completed tool holder, and an advanced unlocking position in which the locking balls 224 can dodge radially, serves a double-acting magnet 235 which engages on one of the housing 211 with the collar projecting and the receiving pin 220 on a portion of its longitudinal extent concentrically enclosing housing sleeve 232 recorded actuating ring 225. This magnet can be double-acting be or actuate the clamping sleeve 225 against the action of a return spring in one of its end positions.

In contrast to the embodiments according to the Fig. 1 to 10 is in the embodiment of the Fig. 11 and 12 the tool holder with the recorded on the spigot or a housing projection tool clamping device is received within a housing cover 236, which extends axially from the machine housing 211 with the adjusting ring and the tool holder and the tool clamping device encloses.

Claims (14)

1. A rotating machine, for example, in the form of a hand drill, a percussion drill, a drill hammer, or a battery-powered screwdriver, having a drive motor received inside a machine housing (111, 211) and a driveshaft (18, 118, 218), which is operationally linked thereto and is led out of the machine housing (111, 211), and having a tool receptacle, which has a tool chucking unit, for the removable coupling of a drill bit, screwdriver bit, or a similar tool to the driveshaft, the tool receptacle and the tool chucking unit being integrated directly in the rotating machine, in that a polygonal longitudinal recess (21, 121, 221), in particular a hexagonal recess, extends in the driveshaft (18, 118, 218), from its output-side end, a clamping sleeve (25, 25', 125, 225) being received on the section of the driveshaft having the tool receptacle as the tool chucking unit, using which at least one catch element (24, 124, 224), which is received in a radial recess, which penetrates the jacket of the tool receptacle, can be actuated in a locking position radially protruding into the tool receptacle and can be released to yield radially into an unlocking location, and the clamping sleeve being implemented as a sliding sleeve (25, 125, 225), which can be axially actuated between the locking position and the unlocking location, characterized in that the clamping sleeve is connected to an actuating sleeve (125', 225'), which is guided so it is rotationally fixed on the machine housing (111, 211) but is axially movable, so it is axially fixed but rotationally movable relative to the actuating sleeve, the actuating sleeve (125', 225') being received on a housing connecting piece (132, 232), which encloses a receptacle pin (120, 220), protruding from the driveshaft, of the tool receptacle on a part of its longitudinal extension, which protrudes from the machine housing (111, 211), so it is axially displaceable and is axially fixable in the locking position.
2. The rotating machine according to Claim 1, characterized in that the tool receptacle (21, 121, 221) extending as a polygonal longitudinal recess into the driveshaft, respectively the receptacle pin (20, 120, 220), is delimited in depth by a tapering centering cone (22, 122, 222) for supporting and centering a tool shaft end having an adapted counter cone.
3. The rotating machine according to Claim 1 or 2, characterized in that three detent balls (24, 124, 224), which are received in the jacket of the receptacle pin (20, 120, 220) of the tool receptacle in radial recesses (23, 123, 223), which penetrate the tool receptacle in proximity to its free front end and are situated distributed around the circumference, serve as clamping elements which can be actuated using the clamping sleeve (25, 25', 125, 225) between a locking position and an unlocking location.
4. The rotating machine according to Claim 3, characterized in that the clamping sleeve (25, 25', 125, 225) is provided with detent protrusions (26, 26', 126, 226) for actuating and locking the detent balls (24, 124, 224) in their locking positions, and the detent protrusions are implemented as spherical caps adapted to the detent balls.
5. The rotating machine according to Claim 4, characterized in that the detent protrusions (26') of the clamping sleeve (25') are situated on spring fingers (38), which protrude axially from the clamping sleeve (25'), and the radial mobility of the spring fingers (38) is delimited by stop means (39).
6. The rotating machine according to one of the preceding claims, characterized in that the sliding sleeve (25) is mounted directly on the receptacle pin (20) of the tool receptacle.
7. The rotating machine according to one of the preceding claims, characterized in that the actuating sleeve (125"), which is connected axially fixed to the clamping sleeve (125), is provided with at least one guide projection (140), which projects beyond the contact surface with the housing connecting piece (132'), and engages in a guide groove (142) extending in the housing connecting piece (132'), on which a locking section (143) running in the peripheral direction adjoins, which permits a limited rotation of the actuating sleeve (125") relative to the housing connecting piece (132) in the locking position, the guide projection (140) reaching the locking section (143) and thus causing axial locking of the actuating sleeve (125").
8. The rotating machine according to one of the preceding claims, characterized in that electrical contacts (134, 135), which only permit the rotating machine to be turned on with a tool chucked in the tool receptacle, are associated with the rotationally-fixed axial guide of the sliding sleeve (125) and/or the actuating sleeve (125'), which is connected thereto so it is rotatable but axially fixed.
9. The rotating machine according to one of the preceding claims, characterized in that the axial displaceability of the sliding sleeve (25, 125) is delimited by at least one springloaded detent cam (28, 128), which engages in the locking position and in the unlocking position in a detent.
10. The rotating machine according to Claim 9, characterized in that the detents, in which the detent cam (28, 128) engages in the particular terminal locations of the sliding sleeve (25, 125), are detent grooves, which are axially spaced apart from one another and are radially worked into the receptacle pin (20), respectively into a housing connecting piece (132) enclosing the latter and mounting the actuating sleeve so it is rotationally fixed.
11. The rotating machine according to one of the preceding claims, characterized in that the sliding sleeve (225) can be actuated using an optionally double-acting electromagnet (235), which engages on the actuating sleeve (225'), which is connected to the sliding sleeve so it is axially fixed but rotationally movable.
12. The rotating machine according to Claim 11, characterized in that the actuation of the sliding sleeve (225) using the electromagnet (235) in one of the terminal locations thereof occurs against the effect of a restoring spring.
13. The rotating machine according to one of Claims 11 or 12, characterized in that the receptacle pin (220) of the tool receptacle having the tool chucking unit is encompassed by a housing cover (236) connected to the machine housing (211).
14. The rotating machine according to one of the preceding claims, characterized in that the polygonal longitudinal recess (121) is delimited in depth by a sleeve-like tappet (134), which is received so it is axially movable in the driveshaft, and which has a centering cone (122) on the side pointing toward the tool receptacle and is operationally linked to a pulsating axial drive, in particular a pneumatic drive.

Images