WO2012022508A1

WO2012022508A1 - Power tool

Info

Publication number: WO2012022508A1
Application number: PCT/EP2011/058935
Authority: WO
Inventors: Holger Schweizer; Juergen Mamber
Original assignee: Robert Bosch Gmbh
Priority date: 2010-07-28
Filing date: 2011-05-31
Publication date: 2012-02-23
Also published as: DE102010038503A1

Abstract

For a power tool (1), in particular an electrically driven handheld power tool, a structure with a machining unit (7) is provided, which unit provides at least two, particularly only two, attachments (4) in coaxial arrangement at an axial distance from each other with a rotationally movably oscillatory and/or rotary drive of its attachments (4).

Description

Description title

The invention relates to a machine tool, in particular as a

Hand tool machine trained electric machine tool, according to the preamble of claim 1, and a, in particular in connection with such a machine tool to be used, processing unit. State of the art

Machine tools, in particular designed as portable power tools, electrically driven machine tools, are known with a variety of processing units and in use. Both as monofunctional machines, such as hand-held circular saws, as well as multifunctional machine tools, as they were built in early designs based on hand drills. The hand drills were equipped for this purpose with different machining units and / or work tools. For example, with grinding or polishing wheels, with wire brushes, with circular saw blades or the like. Also processing units were used, for example, with the interposition of Umlenkgetrieben, constructed as an angle grinder.

In addition to such machine tools designed with rotating working units and / or work tools, machine tools with oscillatingly driven tools, such as, for example, high-frequency driven grinding wheels, scrapers, cutting or sawing tools and the like, are also known.

All these solutions have in common that, regardless of the possible assembly, also with different processing units and / or work tools. be witnesses for the particular case of work only with one processing unit and / or a working tool is worked, and that with regard to a basic construction thus realized additional additional functions are opened by ancillary equipment, such as for parallel guidance to a respective working line by guide rails or guide rulers on the Machine tool is aligned. Such parallel guides are realized, inter alia, with guide rails, which, placed on the respective workpiece aligned, form sliding guides for the machine tool, over which the processing unit and / or working tool is guided along the predetermined by the orientation of the guide rail working line.

Further, less expensive solutions provide the orientation of the machine tool to the workpiece at a predetermined distance to a workpiece side or attached to the workpiece abutment edge over a guide shoe or the like, which is usually connected to the machine tool in the area aufzusetzenden the foot plate, which In order to achieve good results, requires a particularly concentrated and experience-based handling by the user. This especially when cutting narrow workpiece strips with parallel edges, as far as, if crooked contours are to be cut, can be worked with known guide devices in particular in the above-mentioned embodiments.

Disclosure of the invention

The invention has for its object to provide for machine tools, in particular hand tool machines, an embodiment that works without additional guide facilities, in particular sawing, grinding or cutting, with parallel, adjacent work paths .. So in particular the production of strip-like narrow sections or the creation of cutouts with parallel edges. Furthermore, the solution according to the invention should also allow, with appropriate equipment, the cleaning intervention in parallel joints. This is achieved according to the invention with the features of claim 1, the

Dependent claims indicate expedient developments. The fact that in the solution according to the invention one of the machine tool, in particular the hand tool, associated or to be connected to this processing unit is used, which has several - in particular only two - side by side and spaced apart from one another working tools, which operate in correspondingly spaced working levels , Without aligning one of the working tools on a working line, an alignment of the at least one adjacent working tool on a parallel working line is ensured, so that with respect to the respective workpiece an engagement results in mutually spaced and parallel working planes , This can be realized in conjunction with a wide variety of work tools, it also being possible for different work tools to be combined in one machining unit in accordance with the respective work purpose.

A particularly expedient and inventively preferred embodiment is that in a processing unit working tools are used, which are rotatably driven by a lying transversely to their working axis axis and in which zusammenge together in the processing unit working tools aligned in the working direction and in the working direction preferably have parallel working levels. In particular, in such an embodiment, in which for the work tools a rotating or oscillating drive can be provided, there are particularly diverse applications with a simple structure of the respective processing unit, which is also within the scope of the invention, the parallel axis lying and driven processing tools parallel or entangled to make each other, which, according to the setting of the working levels, also results in a corresponding inclination of the respective workpiece-side cutting edges.

In the context of the invention, regardless of the parallel-axis arrangement of the working tools, they can be driven in the same direction or in opposite directions, whereby an opposing drive can be achieved in a simple manner by connecting the working tools of the same axis to one another via an adapter unit designed as a gear. If such a gear arrangement is provided see, so in a corresponding manner to realize a drive with different speeds, so that in the inventive solution, for example, based on processing tools in the form of differently toothed saw blades, can also be used with respect to the respective gear design optimized speeds.

In particular, the invention is suitable for use in machine tools with oscillating driven machining tools, as they are known in particular as grinding devices with approximately triangular-shaped grinding tool (delta grinder), which is coupled to an oscillatingly driven drive shaft. In an embodiment according to the invention, saw blade segments, cutting blades or the like, which are spaced apart from each other and have coaxially adjacent to one another and coaxial with the oscillating drive, have particularly good handling and guiding properties for such hand tooling tools.

The invention further relates to the configuration of a processing unit, in particular for machine tools of the aforementioned type, wherein such a processing unit can also form a supplemental accessory for such machine tools and such a processing unit by at least two interconnected and transversely to its working plane adjacent, rotatably driven machining tools is formed. In the context of a preferred embodiment, only two processing tools are provided for a processing unit, which allows a particularly simple handling or guidance especially in connection with hand tooling machines.

Further details and features of the invention will become apparent from the claims, the drawings and the drawings. The latter show:

1 is a perspective, highly schematic representation of a housing part of a machine tool which receives, for example in training as a rod-shaped handling part, the drive for a working part projecting querabab work shaft on which in the direction of the shaft axis juxtaposed to each other spaced Arbeitswerk- are arranged, which extend in lying transversely to the shaft axis working planes and which are shown symbolically in the illustrations of FIG. 1 to 3 as saw blade segments or circular saw blades, wherein in connection with saw blade segments preferably machine tools with rotary oscillatory drive and in conjunction with

Circular saw blades are preferably used machine tools with rotary drive,

2 is a schematic representation of a machine tool with work tools in the form of saw blade segments corresponding to FIG. 1, FIG.

1, which is equipped with working tools in the form of circular saw blades and has a rotary drive for lying on the working shaft side by side and arranged with parallel working planes circular saw blades, wherein, as in the previous embodiments, the respective drive form for Fig. 4 is a representation corresponding to FIG. 1, in which are provided on the side projecting to the housing side working shaft cutting tools as cutting tools and the machine tool for this on the working shaft arranged cutting blade provides a rotary oscillatory drive, wherein the parallel working planes having

Cutting knife are clamped in the region of their shaft-side foot parts together against the shaft, and

Fig. 5 to 7

further attachment options for each provided coaxially to the working shaft working tools with extending in parallel planes working planes, Fig. 5 and 6 illustrate a common torsionally rigid or at least torsionally rigid definition of the working tools to the working shaft and Fig. 7 shows a solution in which in parallel working planes and coaxially with respect to the shaft axis working tools are interconnected via a gearbox in such a way that regardless of the equiaxed arrangement an equal or opposing oscillatory or rotary drive with the same or different speeds can be realized.

In Fig. 1 of a machine tool 1, only the portion 2 is shown, in which the working shaft 3 is mounted, on which the working tools 4 are arranged. Symbolically dashed is the recorded in the housing 6 of the machine tool 1 electric motor drive 5 and its connection to the working shaft 3 illustrated. According to the preferred embodiment of the machine tool 1 as a hand tool, the housing 6 only partially shown, for example, have a rod-shaped basic shape and thus form the handling part, as is the case with known hand tool machines with rotary oscillatory drive for their respective tools, the assortment of in connection interchangeable with such known hand tool machines

Working tools such as diving saw blades, milling, grinding plates or cutting tools includes, which are used individually as work tools worn over the working shaft. A corresponding basic structure also has known machine tools, in particular hand tool machines, with rotary drive their working shaft, such machine tools work especially as angle grinder with grinding wheels as working tools, in which case only one working tool on the working shaft is arranged and only with this one Work tool is being worked.

In the figures, exemplary embodiments of machine tools 1, in particular hand-held power tools are illustrated, in which work is carried out with a plurality of work tools 4 at a time. These working tools 4 each form a machining unit 7 arranged on the working shaft 3 and connected in a rotationally fixed manner to the working shaft 3, such a machining unit having at least two working tools 8, 9 in transverse planes to which they bear Working shaft 3 extend, thus spaced from each other transversely to their working direction next to each other on the working shaft 3 are arranged. 1 and 2, the processing unit 7, a preferred embodiment of the invention following, formed by two adjacent work tools 8 and 9. However, it is also within the scope of the invention to combine more than two work tools to form a processing unit 7, so that in a solution according to the invention at least two working tools are in use.

Referring to FIGS. 1 and 2, workpieces 8, 9 associated with the processing unit 7 are provided with peripheral toothing 10, which are driven by high frequency oscillations via a corresponding electromotive drive 5 for the working shaft 3, wherein the corresponding oscillating rotational movement of the Working tools 8, 9, as well as the working shaft 3 carrying them, is illustrated by the arrow 1 1. The fixation of the working shaft 3 arranged interchangeable, generally designated 4 working tools relative to the working tools 8 and 9 of FIGS. 1 and 2 can be seen and carried by axial tension against a common, the working shaft 3 positionally fixed Werkzeughalteflansch 13, including the disc-shaped work tools 8, 9 have central pot-shaped flared flange regions 14 and are braced axially against the tool holding flange 13. This can be done preferably, as can be seen from FIG. 2, via a clamping nut 15 which can be screwed onto the working shaft 4 centrally. As can be seen in FIG. 1, the respectively desired spacing between the adjacent machining tools 8, 9, which are aligned with their working planes in the working direction, can be achieved by means of spacers 16 likewise concentric with the working shaft 3 in clamping direction between the working tools 8 and 9 to reach.

In Figs. 1 and 2, the use of the machine tool 1 when sawing veneer strip 17 of thin-walled veneer pads 18 is illustrated, wherein the width of the veneer strip 17 corresponds to the distance between the working tools 8 and 9, so that a parallel course of the cutting edges without additional guide means is ensured and in particular even curved strips can be cut out of the veneer support 18 with a parallel edge course. Similarly, strip-like strips 39 can also be made of thicker-walled materials, for example boards 12, as illustrated in FIG. 3, FIG. 3 providing an example of this as working tools 19, 20 of a machining unit 21 being toothed and rotating continuously over their circumference - To use rend driven saw blades, in accordance with rotary, electric motor drive 5 of the machine tool. Both in terms of their training with a cup-shaped, central flange portion 14 as well as their attachment to the working shaft 2, the processing tools 19, 20 may be designed according to the comments on Fig. 1 and 2.

The cup-shaped, central flange portions 14 of the working tools 4 are preferably formed within the scope of the invention by parts attached to the respective disk-shaped, radially outer peripheral region of the respective working tool 4, which cover a corresponding central cutout and which preferably in the region of its radially projected rim edge Disc-shaped peripheral areas recognized, in particular welded at certain points. Such a built solution offers favorable conditions, both by using different cup-shaped central areas as well as by positionally offset approach thereof to the radially outer peripheral regions of the respective working tools 4 to vary them such that, optionally without additional parts, processing units with different distances between the Build up working levels of their work tools 4.

FIG. 4 shows a machine tool 1 corresponding to FIG. 1, in which the working unit arranged on the working shaft 3 has working tools 22, 23 in the form of knives which extend in working planes transverse to the axis of the working shaft 3 and with respect to them Working planes spaced from each other. The working tools 22, 23 formed by knives are centered relative to the working shaft 3 by axial clamping relative to a working shaft 3 positionally fixed Werkzeughalteflansch 13, wherein the working tools 22, 23 are threaded with their feet abutting each other on the working shaft 3 and a tensioning pulley 25 are fixed against the tool holder flange 13. The strip-shaped radially extending to the working shaft 3, designed as a knife working tools 22, 23 have at least radially outside cutting 26, and starting from the threaded onto the working shaft 3 foot part at least one of the knife-like work tools 22 is bent transversely to the direction of extension, wherein the distance to the working plane of the other knife-like working tool 23 is determined by the degree of the bend. In the context of the invention, it is to be determined by the size of the respective in the axial direction of the working shaft 3 extending bend of the one or both knife-like work tools 22, 23 correspondingly spaced working levels. Such knife assemblies are suitable for example for cleaning or cleaning or scoring adjacent joints, wherein by an entanglement of the knife transversely to the working plane also different

Groove widths can be considered and edited.

FIG. 5 shows an embodiment in which the working tools 28, 29 forming a processing unit 30 with pot-shaped central flange regions 27 are disposed with their cup bottoms braced against one another axially against a mounting flange of the working shaft 3. This results in a simple basic structure for a processing unit 30, in which the minimum distance between the working planes of the working tools 28, 29 is determined by the depth of the cup-shaped central flange 27 and in which between the pot-shaped flange 27 inserted spacers 31 or the like desired distances between let the working levels of adjacent work tools 28, 29 set.

The arrangement of such spacers 31 between mutually adjacent working tools 32, 33 of a processing unit 34 illustrated Fig. 6, which also reveals that the construction of machining units with more than two work tools without fundamental changes in analogy to the described embodiments can be made and also flat Working tools, that is, for example, working tools formed by saw blade discs, can be combined in the invention to form a processing unit.

FIG. 7 shows an exemplary embodiment which uses the distance between two adjacent working tools 35, 36 of a processing unit 37, which are offset from each other transversely to their working planes, in order, if desired, for the working tools 35, 36 of a processing unit 37. niger directions of rotation or a rotary or oscillatory rotary drive with different speeds to realize. For this purpose, in a simple manner, as illustrated in Fig. 7, in the transition region between the working tools 35, 36, a gear 38 may be provided, wherein such a schematically illustrated gear arrangement also offers the possibility, with or without additional spacers different distances between the working planes of the work tools 35, 36 to realize. About such a gear arrangement, in particular, the possibility is opened, working tools of different genus or the same genus, but different design, for example, with different gears, each with practical speeds to drive so that work of different kinds can be performed simultaneously.

In principle, for the working tools 4 of a processing unit 7, a mutually parallel extent of their working planes is the design suitable for most work. In the context of the invention, it is also to work in mutually inclined or entangled working levels, either to achieve kerfs greater width, or against each other inclined cutting edges.

With a machine tool according to the invention u. a. Produce grooved or veneer strips, create boundary cuts for grooves, clean joints of casting compounds, for example for bar decks on water vehicles, carry out general work in model making and also produce narrow cutouts with absolutely parallel edges or ornamental joints in hard to reach areas.

The application areas of the machine tool according to the invention are thus in a variety of fields, u. a. in furniture construction, restoration, in the arts and crafts or in the exhibition, vehicle, dash panel, model and ship and

Yachtbau; In addition, further assignments are given in general hobby work.

Claims

claims

1 . Machine tool, in particular designed as a hand tool machine tool (1) with rotatably driven working tool (4) and in the working direction extending working plane, characterized in that a plurality, in particular only two, working tools (4), as a processing unit (7) are provided Working tools (4) are spaced apart from each other transversely to the working direction.

2. Machine tool according to claim 1, characterized in that the working tools (4) are rotatably driven about an axis transverse to their working planes axis and form a structural unit with the working planes aligned in the working direction.

3. Machine tool according to claim 1 or 2, characterized in that the working tools (4) are assembled to a built processing unit (7).

4. Machine tool according to one of the preceding claims, characterized in that a processing unit (7) is constructed with working tools (4) of the same genus or different genera.

5. Machine tool according to one of the preceding claims, characterized in that the working planes of the working tools (4) of a processing unit (7) are parallel or entangled to each other.

6. Machine tool according to one of the preceding claims, characterized in that the working tools (4) of a processing unit (7) are driven the same or in opposite directions.

7. Machine tool according to one of the preceding claims, characterized in that the working tools (4) of a processing unit (7) are driven at the same or different speeds.

8. Machine tool according to one of the preceding claims, characterized in that the working tools (4) of a processing unit (7) are driven to rotate or oscillate.

9. Processing unit for machine tools, in particular hand tool machines, in particular according to one or more of the preceding claims, characterized in that the processing unit (7) by at least two drivingly connected to each other and transverse to its working plane adjacent, rotatably rotating or oscillating driven working tools (4) is.

10. Processing unit according to claim 9, characterized in that the processing unit (7) by only two in particular rotatably connected to each other working tools (4) is formed.