EP2890534B1 - Cutting strand segment - Google Patents

Description

State of the art

The invention relates to a cutting strand segment according to the preamble of claim 1. Such a cutting strand segment is based, for example, on FIG U.S. 2,608,222 A emerged. Cutting strand segments for a cutting strand of a machine tool parting device are already known which comprise a cutter carrier element, a cutting element arranged on the cutter carrier element and a cutting depth limiting element arranged on the cutter carrier element to limit a maximum cutting depth of the cutting element.

Disclosure of the invention

The invention provides a cutting strand segment for a cutting strand according to claim 1.

The invention is based on a cutting strand segment for a cutting strand of a machine tool parting device, with at least one cutter carrier element, with a cutting element arranged on the cutter carrier element and with at least one cutting depth limiting element arranged on the cutter carrier element to limit a maximum cutting depth of the cutting element.

It is proposed that the cutting depth limiting element limits a maximum cutting depth of the cutting element to a value less than 0.5 mm. A "cutting strand segment" is to be understood here in particular as a segment of a cutting strand which is provided to be connected to further segments of the cutting strand in order to form the cutting strand. “Provided” is to be understood here in particular to be specifically designed and / or specially equipped. The cutting strand segment is preferably designed as a chain link, which is connected to further cutting strand segments designed as chain links to form the cutting strand, which is preferably designed as a cutting chain. The cutting strand segment has in particular a maximum weight that is less than 1 g, preferably less than 0.5 g and particularly preferably less than 0.2 g. Here, the cutting strand segment can be designed as a drive link, a connecting link, a cutting link, etc. of a cutting chain. The cutting strand can be designed as a single-loop, double-loop or three-loop cutting chain. Preferably, the cutter carrier element is coupled, in particular positively connected, to a further cutter carrier element of a further cutting strand segment of the cutting strand to form the cutting strand. A “cutter carrier element” is to be understood here in particular as an element on which at least one cutting element for separating and / or removing material particles from a workpiece to be machined is arranged. The cutting element can be designed as a half chisel tooth, as a full chisel tooth, as a "scratcher" tooth, etc. or as a roof tooth, as a hump tooth, as a standard tooth, in particular as a standard tooth with a standard tooth designed as an equilateral triangle, etc. . However, it is also conceivable that the cutting element has a different tooth shape that appears sensible to a person skilled in the art. The cutting element is particularly preferably designed differently from a planer tooth, half chisel tooth and full chisel tooth. In particular, the cutting element is designed as a "scratcher" tooth. Here, the cutting element is preferably designed as a standard wood cutting tooth or a standard metal cutting tooth. The cutting element can be fixed to the cutter carrier element by means of a form-fitting, by means of a force-fitting and / or by means of a material connection. The cutting element is particularly preferably designed in one piece with the cutter carrier element. "In one piece" is to be understood here in particular to be at least cohesively connected, for example by a welding process, an adhesive process, an injection molding process and / or another process that appears sensible to a person skilled in the art, and / or advantageously formed in one piece, such as by a production from a cast and / or by a production in a single or multi-component injection molding process and advantageously from a single blank.

The cutting strand segment has a connection element arranged on the cutter carrier element and a connection recess arranged on the cutter carrier element for receiving a further connection recess that can be connected to the cutter carrier element Cutter carrier element arranged on connecting element. The connecting element is integrally formed on the cutter carrier element. A distance between a central axis of the connecting element and the connecting recess, a so-called division of the cutting strand, is in particular less than 6 mm, preferably less than 5 mm and particularly preferably less than 4 mm. In an alternative embodiment of the cutting strand segment, not according to the invention, the connecting element is designed as a component that is formed separately from the cutter carrier elements. Here, the cutter carrier elements preferably each have two connection recesses into each of which a connection element can be inserted, the connection element being fixed to the cutter carrier element and the further cutter carrier element after insertion by means of a forming process, such as a stamping process, or by means of a material connection process. The term "connecting element" is intended here to define in particular an element which is provided to connect at least two components to one another in a form-fitting and / or force-fitting manner, in particular to connect them movably to one another in order to transmit a drive force and / or a drive torque.

The term "cutting depth limiting element" is intended here to define in particular an element which, when machining a workpiece, limits penetration of the cutting element into the workpiece, in particular during lifting of at least one workpiece chip, to a maximum value and thus a maximum chip thickness when machining the workpiece pretends removed workpiece chip. The cutting depth limiting element is preferably arranged after the cutting element on the cutter carrier element, viewed along a cutting direction of the cutting element. However, it is also conceivable that the cutting depth limiting element is arranged at a different position on the cutter carrier element that appears sensible to a person skilled in the art, such as, viewed along the cutting direction of the cutting element, before and after the cutting element, next to the cutting element, etc. Under a "cutting direction" is to be understood here in particular as a direction along which the cutting element for generating a cutting gap and / or for separating and / or removing material particles, in particular workpiece chips, of a workpiece to be machined in at least one operating state as a result of a drive force and / or a drive torque, in particular in a guide unit of the machine tool separating device, is moved. By means of the embodiment of the cutting strand segment according to the invention, it is advantageously possible to achieve a low load on the cutting element while a workpiece chip is being lifted off while a workpiece is being machined. In addition, a cut with few tears can advantageously be achieved by means of the cutting strand segment according to the invention.

The cutting depth limiting element advantageously limits a maximum cutting depth of the cutting element to a value less than 0.3 mm, in particular to a value less than 0.25 mm. A jolt-free running of the cutting strand segment can thus advantageously be achieved when machining a workpiece, in particular when the cutting strand segment is connected to further cutting strand segments of the cutting strand.

It is further proposed that the cutting strand segment comprises at least one transverse securing element arranged on the cutter carrier element, which is provided to largely secure the cutter carrier element in an assembled state against transverse movement relative to a further cutter carrier element of the cutting strand. The transverse securing element is preferably formed onto the cutter carrier element by tensile forming. However, it is also conceivable that the transverse securing area is arranged on the cutter carrier element by means of another type of connection that appears sensible to a person skilled in the art, such as for example by means of a form-fit connection method (clipping by means of resilient hook areas, etc.), by means of a welding process, etc. Particularly preferably, the cutter carrier element has at least an embossed cross securing element. A “transverse securing element” is to be understood here as an element which, as a result of a form fit and / or as a result of a force fit, secures a movement along a transverse axis that runs at least substantially perpendicular to a cutting plane of the cutting element. The term “cutting plane” is intended here to define in particular a plane in which the cutting strand segment is moved in at least one operating state for machining a workpiece. When machining a workpiece, the cutting plane is preferably oriented at least substantially transversely to a workpiece surface to be machined. "At least substantially transversely" is intended here to mean in particular an alignment of a plane and / or a direction relative to a further plane and / or a further Direction are understood that preferably deviates from a parallel alignment of the plane and / or the direction relative to the further plane and / or the further direction. However, it is also conceivable that the cutting plane is aligned at least essentially parallel to a workpiece surface to be processed when a workpiece is being processed, in particular when the cutting element is designed as an abrasive, etc. The term "at least essentially parallel" here means in particular an alignment of one direction relative to a reference direction, in particular in a plane, the direction having a deviation from the reference direction, in particular less than 8 °, advantageously less than 5 ° and particularly advantageously less than 2 °. The transverse securing element is preferably designed to differ from a rivet head or a screw head. The transverse securing element is preferably provided to secure or limit transverse movement by means of a form fit. However, it is also conceivable that the transverse securing element is provided to at least secure or limit a transverse movement by means of another manner that appears sensible to a person skilled in the art, such as by means of a magnetic force, etc. The expression "in an assembled state To secure the cutter carrier element as far as possible against transverse movement relative to a further cutter carrier element of the cutting strand "should define here in particular a limitation of a movement of the cutter carrier elements connected to one another by means of at least one connecting element relative to one another by means of the transverse securing element along a movement path running at least substantially perpendicular to the cutting plane of the cutting element. The movement distance of the cutter carrier elements relative to one another is limited to a value less than 5 mm, preferably less than 2 mm and particularly preferably less than 1 mm, in particular by means of the transverse securing element. By means of the embodiment according to the invention, a lateral displacement of the cutter carrier element relative to the further cutter carrier element can advantageously be prevented at least as far as possible during operation, in particular while making a cut, etc. A precise work result can thus advantageously be achieved.

The transverse securing element is preferably arranged on the connecting element. Here, the transverse securing element is particularly preferred after the cutter carrier element has been coupled to the other Cutter carrier element molded onto the connecting element by a forming process. The cutter carrier element and the further cutter carrier element preferably have at least one clearance fit after coupling and after the transverse securing element has been molded on. A rotatable mounting is preferably realized by means of the clearance fit and by means of an interaction of the connecting element of the cutter carrier element and a connection recess of the further cutter carrier element. By means of the configuration according to the invention, it is advantageously possible to reliably secure the cutter carrier element against displacement relative to the further cutter carrier element while a workpiece is being machined by means of the machine tool separating device.

The connecting element is designed in the shape of a bolt. Here, the connecting element, viewed in a plane running at least substantially parallel to the cutting plane, has a circular cross section. The connecting element is particularly preferably cylindrical. However, it is also conceivable that the connecting element has a different configuration that appears expedient to a person skilled in the art. A connecting element can be achieved in a structurally simple manner. Particularly preferably, after coupling at least the cutter carrier element to the further cutter carrier element of the cutting strand, the transverse securing element is embossed on a connecting element of the cutting strand by means of an embossing device. Reliable securing of the cutter carrier element on the further cutter carrier element can advantageously be achieved.

It is further proposed that the transverse securing element has at least one securing area which extends at least substantially parallel to the cutting plane of the cutting element. The securing area preferably has an annular or circular configuration. However, it is also conceivable that the securing area has a different configuration that appears sensible to a person skilled in the art, such as a configuration as a circular ring sector or as a partial extension, etc. further molded on the cutter carrier element. By means of the configuration according to the invention, the cutter carrier element can be secured in a structurally simple manner. In addition, an unwanted Dismantling of the cutter carrier element and the further cutter carrier element can advantageously be prevented after the securing area has been molded on.

It is also proposed that the cutting strand segment have a maximum volume that is less than 20 mm ³ . The cutting strand segment preferably has a maximum volume that is smaller than 10 mm ³ and particularly preferably smaller than 5 mm ³ . A cost-effective production of the cutting strand segment can advantageously be realized, with a small use of material being necessary.

The cutting strand segment, viewed along a direction running at least substantially perpendicular to a cutting plane of the cutting element, advantageously has a maximum dimension that is smaller than 4 mm. The cutting strand segment, viewed along the direction running at least substantially perpendicular to a cutting plane of the cutting element, preferably has a maximum dimension that is less than 3 mm and particularly preferably less than 2.5 mm. A very compact cutting strand segment can advantageously be achieved with which a narrow cut can be made.

Furthermore, a method for producing at least one cutting strand segment according to the invention is described. Here, the cutting strand segment is preferably punched from a strip material in a first step of the method by means of a punching device. Here, for example, the connecting element and further functional areas of the cutting strand segment can be molded onto the cutting strand segment by means of an interaction of a die and a punch during the stamping process. However, it is also conceivable that the cutting strand segment is produced by means of a metal injection molding process (MIM process) or by means of another process that appears sensible to a person skilled in the art. Cost-effective production can advantageously be achieved by means of the method according to the invention.

Furthermore, the invention is based on a cutting strand for a machine tool separating device, with at least one cutting strand segment according to the invention. A "cutting strand" is to be understood here in particular as being a Unit to be understood, which is provided to locally abolish an atomic cohesion of a workpiece to be machined, in particular by means of a mechanical separation and / or by means of a mechanical removal of material particles of the workpiece. The cutting strand is preferably provided for separating the workpiece into at least two physically separate parts and / or at least partially separating and / or removing material particles of the workpiece starting from a surface of the workpiece. Particularly preferably, the cutting strand is moved circumferentially in at least one operating state, in particular along a circumferential direction of a guide unit of the machine tool separating device. The cutting strand is preferably formed by means of a connection of several cutting strand segments. The cutting strand is thus preferably designed as a cutting chain. The cutting strand segments can be detachably connected to one another, for example by means of a chain lock, etc., and / or non-detachably. However, it is also conceivable that the cutting strand is designed as a cutting band and / or a cutting rope. When the cutting strand is designed as a cutting band and / or as a cutting cable, the cutting strand segments are fixed directly to the cutting band and / or to the cutting cable. The cutting strand segments can be arranged at a distance from one another and / or in direct contact with one another on the cutting band and / or on the cutting rope. By means of the embodiment according to the invention, a cutting strand can advantageously be implemented which enables at least substantially jerk-free running in an operation. In addition, the cutting depth limiting elements of the individual cutting strand segments can advantageously keep the risk of the chain tearing as a result of overloading due to the cutting elements being deeply immersed in a workpiece to be machined.

In addition, the invention is based on a power tool separating device, in particular a hand-held power tool separating device, with a cutting strand according to the invention. The power tool separating device preferably comprises a guide unit for guiding the cutting strand, the guide unit and the cutting strand together forming a closed system. A "guide unit" is to be understood here in particular as a unit which is provided to exert a constraining force on the cutting strand at least along a direction perpendicular to a cutting direction of the cutting strand in order to allow the cutting strand to move along the cutting direction. The guide unit preferably has at least one guide element, in particular a guide groove through which the cutting strand is guided. The cutting strand, viewed in a cutting plane, is preferably guided along an entire circumference of the guide unit through the guide unit by means of the guide element, in particular the guide groove. The term "closed system" is intended here to define in particular a system that comprises at least two components which, by means of interaction in a dismantled state of the system from a system superordinate to the system, such as a machine tool, maintain a functionality and / or which are dismantled State are captively connected to each other. The at least two components of the closed system are preferably connected to one another at least essentially in a non-detachable manner for an operator. "At least essentially non-detachable" is to be understood here in particular as a connection of at least two components, which can only be carried out with the aid of cutting tools, such as a saw, in particular a mechanical saw, etc., and / or chemical separating agents, such as solvents, etc. , are separable from each other. An insert tool that can be effectively used and is suitable for a broad spectrum of workpiece machining can advantageously be realized.

Furthermore, it is proposed that the machine tool separating device comprises at least the guide unit, wherein the cutting strand segment has at least one segment guide element arranged on the cutter carrier element, which is provided for a movement of the cutting strand segment in a state of the cutting strand arranged on the guide unit, viewed in a state facing away from the guide unit Direction to limit at least along a direction running at least substantially parallel to a cutting plane of the cutting element. Particularly preferably, each cutting strand segment of the cutting strand of the machine tool separating device has at least one segment guide element which is provided to facilitate a movement of the respective cutting strand segment, viewed in a state arranged in a guide unit in a direction facing away from the guide unit, at least along one at least substantially parallel to one To limit the cutting plane of the cutting element extending direction. The guide unit preferably has at least one segment counter-guide element corresponding to the segment guide element on. The guide unit preferably has at least one guide element, in particular a guide groove through which the cutting strand is guided. The cutting strand, viewed in the cutting plane, is preferably guided along an entire circumference of the guide unit through the guide unit by means of the guide element, in particular the guide groove. Thus, in a structurally simple manner, guidance along a direction of the cutting strand running at least substantially parallel to a cutting plane of the cutting strand can be achieved.

One embodiment describes a machine tool with at least one coupling device for positive and / or non-positive coupling with a machine tool separating device according to the invention. The machine tool is preferably designed as a portable machine tool. A “portable machine tool” is to be understood here in particular as a machine tool, in particular a hand-held machine tool, which can be transported by an operator without a transport machine. The portable machine tool has, in particular, a mass that is less than 40 kg, preferably less than 10 kg and particularly preferably less than 5 kg. The machine tool and the machine tool separating device preferably together form a machine tool system. By means of the configuration of the machine tool according to the invention, a machine tool can advantageously be achieved which is particularly advantageously suitable for a wide range of uses.

The cutting strand segment according to the invention, the cutting strand according to the invention, the machine tool separating device according to the invention and / or the portable machine tool should / should not be limited to the application and embodiment described above. In particular, the cutting strand segment according to the invention, the cutting strand according to the invention, the machine tool separating device according to the invention and / or the portable machine tool can have a number of individual elements, components and units that differs from a number of individual elements, components and units mentioned herein in order to fulfill a functionality described herein.

Further advantages emerge from the following description of the drawings. Exemplary embodiments of the invention are shown in the drawing. The drawing, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations.

Fig. 1

eine tragbare Werkzeugmaschine mit einer erfindungsgemäßen Werkzeugmaschinentrennvorrichtung in einer schematischen Darstellung,

Fig. 2

eine Detailansicht der erfindungsgemäßen Werkzeugmaschinentrennvorrichtung in einer schematischen Darstellung,

Fig. 3

eine Detailansicht eines erfindungsgemäßen Schneidstrangsegments eines erfindungsgemäßen Schneidstrangs in einer schematischen Darstellung,

Fig. 4

eine Detailansicht eines alternativen erfindungsgemäßen Schneidstrangsegments in einer schematischen Darstellung,

Fig. 5

eine Detailansicht eines weiteren, nicht erfindungsgemäßen Schneidstrangsegments in einer schematischen Darstellung,

Fig. 6

eine Detailansicht eines weiteren, nicht erfindungsgemäßen Schneidstrangsegments in einer schematischen Darstellung und

Fig. 7

eine Detailansicht eines alternativen erfindungsgemäßen Schneidstrangs in einer schematischen Darstellung.

Show it:

Fig. 1

a portable machine tool with a machine tool separating device according to the invention in a schematic representation,

Fig. 2

a detailed view of the machine tool separating device according to the invention in a schematic representation,

Fig. 3

a detailed view of a cutting strand segment according to the invention of a cutting strand according to the invention in a schematic representation,

Fig. 4

a detailed view of an alternative cutting strand segment according to the invention in a schematic representation,

Fig. 5

a detailed view of a further cutting strand segment not according to the invention in a schematic representation,

Fig. 6

a detailed view of a further, not according to the invention cutting strand segment in a schematic representation and

Fig. 7

a detailed view of an alternative cutting strand according to the invention in a schematic representation.

Description of the exemplary embodiments

Figure 1 shows a portable machine tool 36a with a machine tool separating device 14a, which together form a machine tool system. The portable machine tool 36a has a coupling device 38a for form-fitting and / or force-fitting coupling with the machine tool separating device 14a. The coupling device 38a can be designed as a bayonet lock and / or as another coupling device that appears sensible to a person skilled in the art. Furthermore, the portable machine tool 36a has a machine tool housing 40a which encloses a drive unit 42a and a gear unit 44a of the portable machine tool 36a. The drive unit 42a and the gear unit 44a are operatively connected to one another in a manner already known to a person skilled in the art in order to generate a drive torque that can be transmitted to the machine tool separating device 14a. The gear unit 44a is designed as an angular gear. The drive unit 42a is designed as an electric motor unit. However, it is also conceivable that the drive unit 42a and / or the gear unit 44a have a different configuration that appears sensible to a person skilled in the art. The drive unit 42a is provided to drive a cutting strand 12a of the machine tool parting device 14a in at least one operating state at a cutting speed of less than 6 m / s. The portable machine tool 36a has at least one operating mode in which the cutting strand 12a can be driven in a guide unit 32a of the machine tool separating device 14 along a cutting direction 72a of a cutting element 18a of a cutting strand segment 10a of the cutting strand 12a at a cutting speed of less than 6 m / s.

Figure 2 shows the machine tool separating device 14a in a state decoupled from the coupling device 38a of the portable machine tool 36a. The machine tool separating device 14a has the cutting strand 12a, which comprises at least one cutting strand segment 10a. Furthermore, the machine tool separating device 14a has the guide unit 32a, which together with the cutting strand 12a forms a closed system. Of the Cutting strand 12a is guided by means of guide unit 32a. For this purpose, the guide unit 32a has at least one guide groove (not shown in detail here). The cutting strand 12a is guided by means of edge regions of the guide unit 32a that delimit the guide groove. However, it is also conceivable that the guide unit 32a has another element for guiding the cutting strand 12a that appears useful to a person skilled in the art, such as an element designed as a rib-like projection on the guide unit 32a, which engages in a recess on the cutting strand 12a. The cutting strand 12a is moved circumferentially along a circumference of the guide unit 32a in the guide groove during operation.

The cutting strand segment 10a has at least one connecting element 46a for connection to a further cutting strand segment 48a of the cutting strand 12a, which is formed in one piece with a cutter carrier element 16a of the cutting strand segment 10a ( Figure 3 ). The cutting strand 12a thus comprises at least one connecting element 46a for connecting the cutting strand segment 10a and the further cutting strand segment 48a. The connecting element 46a is bolt-shaped. Here, the connecting element 46a is provided for, by means of an interaction with a connecting recess (not shown in detail here) of a further cutter carrier element 26a of the further cutting strand segment 48a, a form-fitting connection between the cutter carrier element 16a and the further cutter carrier element 26a or between the cutting strand segment 10a and the further cutting strand segment 48a to be realized. The cutting strand segment 10a also comprises a connecting recess 50a arranged on the cutter carrier element 16a. The connecting recess 50a of the cutter carrier element 16a interacts to form the cutting strand 12a with a further connecting element (not shown in detail here) of the cutting strand 12a or a third cutting strand segment 52a. Thus, each cutting strand segment of the cutting strand 12a comprises at least one connecting element arranged on the respective cutter carrier element of the cutting strand segments and at least one connecting recess arranged on the respective cutter carrier element of the cutting strand segments. Thus, the cutting strand segments of the cutting strand are 12a mounted pivotably relative to one another by means of an interaction of the connecting elements and the connecting recesses.

The connecting element 46a of the cutting strand segment 10a terminates at least substantially flush with at least one outer surface 54a of the cutter carrier element 16a. However, it is also conceivable that the connecting element 46a, viewed along a direction running at least substantially perpendicular to the outer surface 54a, protrudes beyond the outer surface 54a or is arranged set back to the outer surface 54a. By protruding or flush with the outer surface 54a of the connecting element 46a, the cutting strand segment 10a, in a state arranged in the guide groove, can be guided over the connecting element 46a at edge regions of the guide groove.

Furthermore, the cutting strand segment 10a has at least one transverse securing element 22a arranged on the cutter carrier element 16a, which is provided to secure the cutter carrier element 16a as far as possible in an assembled state against transverse movement relative to the further cutter carrier element 26a of the cutting strand 12a ( Figure 3 ). The cutting strand segment 10a has at least one embossed transverse securing element 22a. The transverse securing element 22a is arranged on the connecting element 46a. Here, the transverse securing element 22a has at least one securing area 28a which extends at least substantially parallel to a cutting plane of the cutting element 18a. The securing region 28a thus extends at least substantially parallel to the outer surface 54a of the cutter carrier element 16a. After a coupling of at least the cutter carrier element 16a to the further cutter carrier element 26a of the cutting strand 12a, the transverse securing element 22a is embossed on the connecting element 46a of the cutting strand 12a by means of an embossing device. The securing region 28a is thus formed as a result of the stamping of the transverse securing element 22a.

The securing area 28a is provided by means of an interaction with an annular groove-shaped counter securing area (not shown in detail here) of the further cutter carrier element 26a, which To secure the cutter carrier element 16a in a mounted state in at least one direction running at least substantially perpendicular to the outer surface 54a as far as possible against a transverse movement relative to the further cutter carrier element 26a of the cutting strand 12a. The cutting strand segment 10a also has an annular groove-shaped counter-locking region 56a. The counter-locking area 56a is arranged in the area of the connecting recess 50a on the cutter carrier element 16a. Furthermore, after a connection of the connecting element 46a of the cutter carrier element 16a and a connection recess of the further cutter carrier element 26a, the cutter carrier element 16a is activated by means of an interaction of an edge region of the further cutter carrier element 26a delimiting the connection recess of the further cutter carrier element 26a with a coupling area 58a surrounding the connecting element 46a of the cutter carrier element 16a The cutter carrier element 16a is largely secured against transverse movement relative to the further cutter carrier element 26a in at least one further direction running at least substantially perpendicular to the outer surface 54a. Here, each cutter carrier element of the cutting strand segments of the cutting strand 12a comprises at least one transverse securing element which is arranged on the connecting element by means of embossing after coupling to a further cutter carrier element.

The cutting strand segment 10a furthermore has at least one segment guide element 34a arranged on the cutter carrier element 16a, which is provided for the purpose of a movement of the cutting strand segment 10a in a state arranged on the guide unit 32a, viewed in a direction facing away from the guide unit 32a, at least along at least one To delimit the direction running essentially parallel to the cutting plane of the cutting element 18a ( Figure 3 ). The segment guide element 34a is formed by a transverse extension which extends at least substantially perpendicular to the outer surface 54a of the cutter carrier element 16a. Here, the segment guide element 34a delimits a longitudinal groove. The segment guide element 34a is provided to limit movement with segment counter-guide elements 60a, 62a arranged on an inner surface of the guide unit 32a facing the cutter carrier element 16a of the guide unit 32a ( Figure 2 ) to work together. The segment mating guide elements 60a, 62a are designed to correspond to the segment guide element 34a of the cutting strand segment 10a. Each of the cutting strand segments of the cutting strand 12a here comprises at least one segment guide element which is provided for the purpose of a movement of the cutting strand segments in a state arranged on the guide unit 32a, viewed in a direction facing away from the guide unit 32a, at least along an at least substantially parallel to the cutting plane of the To limit cutting elements 18a extending direction.

In addition, the cutting strand segment 10a has a 16a pressure force transmission surface 64a arranged on the cutter carrier element ( Figure 3 ). The compressive force transmission surface 64a is provided to support compressive forces which act on the cutting strand 12a during machining of a workpiece (not shown in detail here) by means of an interaction with a compressive force absorbing area (not shown in detail here) of the guide unit 32a. The compressive force absorption area of the guide unit 32a is here, viewed along a direction running at least substantially perpendicular to the cutting plane of the cutting element 18a, between two at least substantially parallel outer surfaces of the guide unit 32a. Here, each of the cutting strand segments of the cutting strand 12a comprises a pressure force transmission surface.

The cutting strand segment 10a also has a drive surface 66a which is arranged on the cutter carrier element 16a and which is provided to drive the cutting strand 12a with drive surfaces of a torque transmission element 68a ( Figure 2 ) to cooperate with the machine tool separating device 14a. The drive surfaces of the torque transmission element 68a are designed as tooth flanks. The drive surface 66a of the cutter carrier element 14 is designed to correspond to the drive surfaces of the torque transmission element 68a. When the cutting strand 12a is driven, the tooth flanks of the torque transmission element 68a are temporarily in contact with the drive surface 66a for the transmission of drive forces. Here, each cutting strand segment of the cutting strand 12a comprises a drive surface.

The torque transmission element 68a is rotatably mounted in the guide unit 32a for driving the cutting strand 12a. The torque transmission element 68a is in a coupled state for driving the cutting strand 12a with a pinion (not shown here) of the drive unit 42a and / or a gear (not shown here) and / or a toothed shaft (not shown here) of the gear unit 44a coupled. Here, the torque transmission element 68a has a coupling recess 70a which, in an assembled state, can be coupled to a drive element of the portable machine tool 36a. The coupling recess 70a is arranged concentrically in the torque transmission element 68a. Furthermore, the coupling recess 70a is provided in a coupled state of the torque transmission element 68a and / or the machine tool separating device 14a with the pinion (not shown in detail here) of the drive unit 42a and / or the gear (not shown in detail here) and / or the toothed shaft (not shown here) to be coupled to the gear unit 44a. The coupling recess 70a is designed as a hexagon socket. However, it is also conceivable that the coupling recess 70a has a different configuration that appears sensible to a person skilled in the art. In addition, it is conceivable that the machine tool separating device 14a is formed decoupled from the torque transmission element 68a in an alternative embodiment, not shown in detail here. Here, the pinion (not shown in detail here) of the drive unit 42a and / or the gear (not shown in detail here) and / or the toothed shaft (not shown in detail here) of the gear unit 44a would engage directly in the guide unit 32a and would be decoupled from a Interconnection of a torque transmission element arranged in the guide unit 32a for driving the cutting strand 12a is provided.

Furthermore, the cutting strand segment 10a has at least the cutting element 18a arranged on the cutter carrier element 16a. The cutting element 18a is formed in one piece with the cutter carrier element 16a. The cutting element 18a is provided to enable a separation and / or removal of material particles from a workpiece to be machined (not shown in detail here). For this purpose, the cutting element 18a is as "scratcher" tooth developed. The cutting element 18a extends here at least substantially parallel to the outer surface 54a of the cutter carrier element 16a. The cutting strand segment 10a is punched in one piece from a strip material by means of a punching device in one work step. Each cutting strand segment of the cutting strand 12a comprises at least one cutting element. However, it is also conceivable that each of the cutting strand segments of the cutting strand 12a has a different number of cutting elements. The cutting element 18a can have a cutting layer comprising at least titanium carbide (not shown here). The cutting layer is applied to the cutting element 18a by means of a CVD method. However, it is also conceivable that the cutting layer alternatively or additionally comprises another material, such as, for example, titanium nitride, titanium carbonitride, aluminum oxide, titanium aluminum nitride, chromium nitride or zirconium carbonitride. In addition, it is also conceivable that the cutting layer is applied by means of another method that appears sensible to a person skilled in the art, such as, for example, by means of a PVD or PACVD method. Furthermore, it is conceivable that the cutting element 18a is configured with particles. In this case, the cutting element 18a can be equipped with diamond particles, with hard metal particles or with other particles that appear useful to a person skilled in the art.

Furthermore, the cutting strand segment 10a has at least one cutting depth limiting element 20a arranged on the cutter carrier element 16a to limit a maximum cutting depth of the cutting element 18a ( Figure 3 ). Thus, the cutting strand segment 10a comprises at least the cutter carrier element 16a, at least the cutting element 18a arranged on the cutter carrier element 16a and at least the cutting depth limiting element 20a arranged on the cutter carrier element 16a to limit a maximum cutting depth of the cutting element 18a. Here, the cutting strand segment 10a has a maximum volume that is less than 20 mm ³ . The cutting depth limiting element 20a limits a maximum cutting depth of the cutting element 18a to a value less than 0.5 mm. Here, the cutting depth limiting element 20a limits a maximum cutting depth of the cutting element 18a to a value less than 0.3 mm. The maximum depth of cut of the cutting element 18a is determined by a distance between a top side 74a of the cutting depth limiting element 20a and a cutting edge 78a of the cutting element 18a, viewed along a direction running in the cutting plane of the cutting element 18a at least substantially perpendicular to the cutting direction 72a of the cutting element 18a. The cutting depth limiting element 20a, viewed along the cutting direction 72a of the cutting element 18a, is arranged behind the cutting element 18a on the cutter carrier element 16a. Thus, viewed along the cutting direction 72a of the cutting element 18a, a chip space 80a of the cutting strand segment 10a is formed. Here, the cutting depth limiting element 20a is formed in one piece with the cutter carrier element 16a. The cutting depth limiting element 20a is integrally formed on the cutter carrier element 16a in the area of the connecting recess 50a. The cutting strand segments of the cutting strand 12a each have a cutting depth limiting element. However, it is also conceivable that not every cutting strand segment of the cutting strand 12a has a cutting depth limiting element and the cutting strand segments are combined with one another to form the cutting strand 12a in various arrangements with and without the cutting depth limiting element.

In Figures 4 to 7 alternative embodiments are shown. Components, features and functions that are essentially the same are generally numbered with the same reference symbols. To distinguish the exemplary embodiments, the letters a to c and / or apostrophes are added to the reference numerals of the exemplary embodiments. The following description is essentially limited to the differences to that in the Figures 1 to 3 described first embodiment, with respect to the same components, features and functions to the description of the first embodiment in the Figures 1 to 3 can be referenced.

Figure 4 shows a for cutting strand segment 10a from Figure 3 alternatively designed cutting strand segment 10a '. The cutting strand segment 10a 'has a to the cutting strand segment 10a Figure 3 at least substantially analogous design. The difference between the cutting strand segment 10a Figure 3 and the cutting strand segment 10a 'consists in one embodiment of the cutting element 18a of the cutting strand segment 10a Figure 3 and des Cutting element 18a 'of the cutting strand segment 10a' Figure 4 . The cutting element 18a 'of the cutting strand segment 10a' Figure 4 has along a cutting direction 72a 'of the cutting element 18a' a changing twist relative to an outer surface 54a 'of a cutter carrier element 16a' of the cutting strand segment 10a '. Here, the cutting element 18a 'is arranged on the cutter carrier element 16a' so as to be inclined about two at least substantially perpendicular axes relative to the outer surface 54a 'relative to the cutter carrier element 16a'. The two at least essentially perpendicular axes here preferably extend at least essentially parallel to the outer surface 54a 'of the cutter carrier element 16a' and / or to the cutting plane of the cutting element 18a '. With regard to further features of the cutting strand segment 10a 'from Figure 4 may refer to the description of the Figures 1 to 3 to get expelled. To form the cutting strand 12a from the Figures 1 to 3 can consist of several cutting strand segments 10a ' Figure 4 and a plurality of cutting strand segments 10a Figure 3 be arranged one behind the other in an order that appears sensible to a person skilled in the art.

Figure 5 shows a for cutting strand segment 10a from Figure 3 alternative cutting strand segment 10b not according to the invention. The cutting strand segment 10b comprises at least one cutter carrier element 16b, at least one cutting element 18b arranged on the cutter carrier element 16b and at least one cutting depth limiting element 20b arranged on the cutter carrier element 16b to limit a maximum cutting depth of the cutting element 18b. The cutting element 18b is designed as a "scratcher" tooth. Here, the cutting element 18b extends at least substantially parallel to an outer surface 54b of the cutter carrier element 16b. The cutting strand segment 10b further comprises at least one connecting element 46b arranged on the cutter carrier element 16b. The connecting element 46b is formed in one piece with the cutter carrier element 16b. Here, the connecting element 46b is designed as a longitudinal extension of the cutter carrier element 16b. The longitudinal extension is hook-shaped. Here, the longitudinal extension is designed differently from a rod-shaped extension onto which a circular form-locking element is formed and / or different from a semicircular extension.

Furthermore, the connecting element 46b embodied as a longitudinal extension has a transverse securing area 76b on one side. The transverse securing area 76b is provided for, by means of an interaction with at least one transverse securing element of a further cutter carrier element connected to the cutter carrier element 16b (not shown in detail here), a transverse movement of the cutter carrier element 16b along at least two oppositely aligned directions in a coupled state relative to the further cutter carrier element, at least as far as possible to prevent. Here, the transverse securing area 76b is designed as a rib. However, it is also conceivable that the transverse securing area 76b has a different configuration that appears sensible to a person skilled in the art, such as a configuration as a groove etc. . Furthermore, the transverse securing region 76b or the connecting element 46b, viewed along a cutting direction 72b of the cutting element 18b, is arranged on a side of the cutter carrier element 16b facing away from the cutting depth limiting element 20b.

Furthermore, the cutting strand segment 10b has two transverse securing elements 22b, 24b arranged on the cutter carrier element 16b, which are provided to interact with a transverse securing area of the further cutter carrier element in a coupled state of the cutter carrier element 16b with the further cutter carrier element. The transverse securing elements 22b, 24b are each arranged in an edge region of the cutter carrier element 16b that delimits a connecting recess 50b of the cutter carrier element 16b. Here, the transverse securing elements 22b, 24b are formed in one piece with the cutter carrier element 16b. The transverse securing elements 22b, 24b are each molded in one piece onto the cutter carrier element 16b by means of a stamping process.

Figure 6 shows a to the cutting strand segment 10b from Figure 5 alternatively designed cutting strand segment 10b 'not according to the invention. The cutting strand segment 10b 'has a to the cutting strand segment 10b Figure 5 at least substantially analogous design. The difference between the cutting strand segment 10b from Figure 5 and the cutting strand segment 10b 'consists in one embodiment of the cutting element 18b of the cutting strand segment 10b Figure 5 and des Cutting element 18b 'of the cutting strand segment 10b' Figure 6 . The cutting element 18b 'of the cutting strand segment 10b' Figure 6 has along a cutting direction 72b 'of the cutting element 18b' a changing twist relative to an outer surface 54b 'of a cutter carrier element 16b' of the cutting strand segment 10b '. Here, the cutting element 18b 'is arranged on the cutter carrier element 16b' so as to be inclined about two at least substantially perpendicular axes relative to the outer surface 54b 'relative to the cutter carrier element 16b'. The two at least essentially perpendicular axes here preferably extend at least essentially parallel to the outer surface 54b 'of the cutter carrier element 16b' and / or to the cutting plane of the cutting element 18b '. With regard to further features of the cutting strand segment 10b 'from Figure 6 may refer to the description of the Figure 5 to get expelled.

Figure 7 shows an alternative cutting strand 12c. The cutting strand 12 comprises a plurality of cutting strand segments 10c, 48c, 52c, each of which comprises at least one cutter carrier element 16c, at least one cutting element 18c arranged on the cutter carrier element 16c and at least one cutting depth limiting element 20c arranged on the cutter carrier element 16c to limit a maximum cutting depth of the cutting element 18c. Here, the cutting strand 12c has two types of cutting strand segments 10c, 48c, 52c. On the one hand, the cutting strand 12c has drive link cutting strand segments and, on the other hand, cutting link cutting strand segments which are arranged alternately one behind the other along a cutting direction 72c of the cutting elements 18c. In order to connect the cutting strand segments 10c, 48c, 52c, the cutting strand 12c comprises connecting elements 46c formed separately from the cutting strand segments 10c, 48c, 52c. The connecting elements 46c are designed as connecting bolts or connecting rivets. Here, the connecting elements 46c to connect the cutting strand segments 10c, 48c, 52c are pushed into connecting recesses 50c of the cutting strand segments 10c, 48c, 52c and secured against falling out of the connecting recesses 50c by reshaping and / or welding a holding area of the connecting elements 46c. Here, all cutting strand segments 10c, 48c, 52c each have a cutting depth limiting element 20c. However, it is also conceivable that only cutting strand segments 10c, 48c, 52c have cutting depth limiting elements 20c which are designed as cutting links or drive links. Further combinations of an arrangement of cutting depth limiting elements 20c on the cutting strand segments 10c, 48c, 52c are also conceivable. With regard to further features of the cutting strand segments 10c, 48c, 52c, reference may be made to the description of FIG Figures 1 to 3 to get expelled.

Claims (8)

1. Cutting strand segment for a cutting strand of a power-tool parting device, having at least one a cutter carrier element (16a; 16a'; 16c), having at least one cutting element (18a; 18a'; 18c) arranged on the cutter carrier element (16a; 16a'; 16c), and having at least one cut-depth limiting element (20a; 20a'; 20c), arranged on the cutter carrier element (16a; 16a'; 16c), for limiting a maximum depth of cut of the cutting element (18a; 18a'; 18c), wherein the cut-depth limiting element (20a; 20a'; 20c) limits a maximum depth of cut of the cutting element (18a; 18a'; 18c) to a value of less than 0.5 mm,
   characterized by at least one transverse securing element (22a; 22a') which is arranged on the cutter carrier element (16a; 16a'; 16b; 16b') and which is intended to secure the cutter carrier element (16a; 16a'), when in a mounted state, as far as possible against a transverse movement relative to a further cutter carrier element (26a) of the cutting strand wherein the transverse securing element (22a; 22a') is intended, as a result of a form fit and/or as a result of a force fit, to secure a movement along a transverse axis that extends at least substantially perpendicularly to a cutting plane of the cutting element (18a; 18a'; 18c), wherein the cutting strand element (10a, 10a'), for connection to a further cutting strand segment (48a, 48a) of the cutting strand (12a, 12a'), has at least one stud-form connecting element (46a, 46a') which is formed integrally with a cutter carrier element (16a, 16a') of the cutting strand segment (10a, 10a').
2. Cutting strand segment according to Claim 1, characterized in that the cut-depth limiting element (20a; 20a'; 20c) limits a maximum depth of cut of the cutting element (18a; 18a'; 18c) to a value of less than 0.3 mm.
3. Cutting strand segment according to Claim 2, characterized in that the transverse securing element (22a; 22a') has at least one securing region (28a; 28a') that extends at least substantially parallel to a cutting plane of the cutting element (18a; 18a').
4. Cutting strand segment according to one of the preceding claims, characterized in that the transverse securing element, particularly preferably after the cutter carrier element has been coupled to the further cutter carrier element, has been integrally formed onto the connecting element by a forming process.
5. Cutting strand segment according to one of the preceding claims, characterized by a maximum volume that is less than 20 mm³.
6. Cutting strand for a power-tool parting device, having at least one cutting strand segment according to one of the preceding claims.
7. Power-tool parting device, in particular hand-held power-tool parting device, having at least one cutting strand according to Claim 6.
8. Power-tool parting device according to Claim 7, characterized by at least one guide unit (32a), wherein the cutting strand segment has at least one segment guide element (34a; 34a'; 34b; 34b') which is arranged on the cutter carrier element (16a; 16a'; 16b; 16b') and which is intended to limit a movement of the cutting strand segment, when the cutting strand is in a state arranged on the guide unit (32a), as viewed in a direction away from the guide unit (32a), at least in a direction that is at least substantially parallel to a cutting plane of the cutting element (18a; 18a'; 18b; 18b').

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