Portable machine tool with workpiece support unit

Abstract

Portable machine tool, in particular hand-held machine tool, with at least one drive unit (12), with at least one tool holder unit (14) which is intended to receive a machining tool device (16), with at least one rotary bearing unit (18) for rotatably mounting the tool holder unit (14) relative to the drive unit (12), and with at least one workpiece support unit (22) which comprises at least one stationary workpiece support surface (24) which can be placed on the workpiece during machining of a workpiece, wherein the workpiece support unit (22) comprises at least one further stationary workpiece support surface (26) which, depending on a rotational position of the tool holder unit (14), can be placed on the workpiece as an alternative to the workpiece support surface (24) during machining of a workpiece, characterized in thatthat the workpiece contact surface (24) is arranged on a leg (30) of the workpiece contact element (28) of the workpiece contact unit (22), which is angled relative to a further leg 32 of the workpiece contact element (28) on which the further workpiece contact surface (26) is arranged..,

Description

State of the art

[0001] Portable machine tools are already known that comprise a drive unit, a tool receiving unit designed to receive a machining tool device, a pivot bearing unit for rotatably supporting the tool receiving unit relative to the drive unit, and a workpiece support unit having at least one stationary workpiece support surface that can be applied to the workpiece during machining. DE 10 2011 005 039 A1 discloses a machine tool separating device and a portable machine tool with a coupling device. Furthermore, DE 79 04 242 U discloses a portable power tool for machining workpieces, comprising a cutting tool. Disclosure of the invention

[0002] The invention is based on a portable machine tool, in particular a hand-held power tool, with at least one drive unit, with at least one tool holding unit which is intended to hold a machining tool device, with at least one rotary bearing unit for a rotatable mounting of the tool holding unit relative to the drive unit and with at least one workpiece contact unit which comprises at least one stationary workpiece contact surface which can be placed on the workpiece during machining of a workpiece.

[0003] It is proposed that the workpiece support unit comprise at least one further stationary workpiece support surface which, depending on a rotational position of the tool holder unit, can be placed on the workpiece as an alternative to the workpiece support surface during machining of a workpiece. A "portable machine tool" is to be understood here in particular as a machine tool for machining workpieces which can be transported by an operator without the need for a transport machine. The portable machine tool has in particular a mass which is less than 40 kg, preferably less than 10 kg and particularly preferably less than 5 kg. Due to the rotatable mounting of the tool holder unit relative to the drive unit, a jigsaw function and a saber saw function of the portable machine tool can preferably be implemented by means of the portable machine tool.Thus, the portable machine tool is preferably movable for machining a workpiece along a working direction according to a jigsaw and, in an alternative angular position of the tool holder unit, along a working direction according to a saber saw.

[0004] The tool holder unit is preferably provided for operatively connecting, in particular drive-related, the machining tool device to the portable machine tool by means of a positive and / or non-positive connection for machining a workpiece. In particular, when the tool holder unit is coupled to the machining tool device, forces and / or torques can be transmitted from the drive unit of the portable machine tool to the machining tool device in an operating state of the portable machine tool for driving the machining tool device.Particularly preferably, the tool holder unit has a movement capability along at least one path and / or around an axis that is independent of a purely closing movement of the tool holder unit for operatively connecting the machining tool device to the portable machine tool and / or an opening movement of the tool holder unit for releasing the operative connection of the machining tool device to the portable machine tool. Furthermore, the tool holder unit has a movement capability along at least one path and / or around an axis that is independent of a purely drive movement for driving the machining tool device.The pivot bearing unit is preferably provided for rotatably mounting the tool holder unit, starting from a first position relative to the drive unit, in one direction by an angle greater than 15°, preferably greater than 30°, and particularly preferably greater than 60°. In particular, the pivot bearing unit is provided for rotatably mounting the tool holder unit, starting from a first position relative to the drive unit, in one direction by an angle of less than 100°. However, it is also conceivable for the pivot bearing unit to be provided for rotatably mounting the tool holder unit, starting from a first position relative to the drive unit, in two opposite directions, each by an angle greater than 15°, preferably greater than 30°, and particularly preferably greater than 60°. In addition, the tool holder unit is preferably rotatably mounted relative to the workpiece support unit by means of the pivot bearing unit.Thus, the workpiece support unit is preferably designed to be stationary relative to a housing unit of the portable machine tool. Locking the tool holder unit relative to the drive unit by more than two people is also conceivable.

[0005] A "workpiece support unit" is to be understood here in particular as a unit against which at least one workpiece can be pressed as a result of the action of machining forces of the machining tool device on the workpiece during machining, or by means of which the portable machine tool can be supported and / or applied to the workpiece for machining a workpiece. Thus, the workpiece support surface is preferably intended to bear against at least one workpiece surface during machining of a workpiece. The workpiece support unit thus preferably forms a base plate and / or a sliding block of the portable machine tool, by means of which the portable machine tool can be supported on the workpiece during machining of a workpiece and / or can be slidably moved on a workpiece surface.It is conceivable here for the workpiece contact surface and / or the further workpiece contact surface to have / have a sliding coating, such as a Teflon coating, etc. Preferably, the workpiece contact surface can be placed against a workpiece in a rotational position of the tool holder unit relative to the drive unit that forms a saber saw function. Preferably, the further workpiece contact surface can be placed against a workpiece in a rotational position of the tool holder unit relative to the drive unit that forms a jigsaw function. By means of the configuration according to the invention, a rotational movement of the tool holder unit that is independent of a movement of the workpiece contact unit can advantageously be enabled. As a result, the movable part can advantageously be kept compact. Thus, a portable machine tool that is comfortable to operate can advantageously be realized.Furthermore, a reliable attachment option for a workpiece can advantageously be enabled, which represents a secure attachment option in all possible rotational positions, in particular in all possible fixable rotational positions, of the tool holder unit.

[0006] Furthermore, it is proposed that the workpiece contact surface and the further workpiece contact surface are arranged on at least one workpiece contact element of the workpiece contact unit. The workpiece contact element is preferably made of at least one metal. The workpiece contact element preferably has at least one bracket-like section. In particular, the workpiece contact surface and / or the further workpiece contact surface are / are formed integrally with the workpiece contact element. “Integral” should be understood in particular to mean at least materially connected, for example by a welding process, an adhesive process, an injection molding process and / or another process that appears appropriate to a person skilled in the art, and / or advantageously formed in one piece, for example by production from a cast and / or by production using a single-component or multi-component injection molding process and advantageously from a single blank.By means of the inventive design, a compact arrangement of the workpiece support surface and the additional workpiece support surface can be advantageously realized. Furthermore, a cost-effective workpiece support unit can be advantageously realized.

[0007] It is further proposed that the workpiece support surface be arranged on a leg of the workpiece support element of the workpiece support unit, which leg is angled relative to another leg of the workpiece support element on which the further workpiece support surface is arranged. Thus, the workpiece support surface and the further workpiece support surface advantageously form an angle other than 180°. By means of the inventive design, it can be achieved in a structurally simple manner that the workpiece support surface can be placed against a workpiece in a saber saw function rotational position, and the further tool support surface can alternatively be placed against a workpiece in a jigsaw function rotational position.

[0008] Furthermore, it is proposed that the workpiece support surface and the additional workpiece support surface enclose an angle other than 90°. However, it is also conceivable that the workpiece support surface and the additional workpiece support surface enclose an angle of 90° in an alternative embodiment of the machine tool. By means of the embodiment according to the invention, ergonomic handling of the portable machine tool can advantageously be achieved, particularly in a jigsaw function rotational position of the tool holder unit relative to the drive unit.

[0009] Furthermore, it is proposed that the workpiece contact surface and / or the further workpiece contact surface run / run at least substantially transversely to a drive axis of the drive unit. Preferably, the workpiece contact surface and / or the further workpiece contact surface run / run at least substantially transversely to a drive axis of the drive unit in all possible rotational positions of the tool holder unit. “Substantially transversely” is to be understood here in particular as an orientation of a surface and / or an axis relative to a reference direction and / or a reference axis, wherein the orientation of the surface and / or the axis is at least different from an at least substantially parallel orientation to the reference direction and / or the reference axis and is in particular skewed or perpendicular to the reference direction and / or the reference axis.By means of the design according to the invention, a reliable attachment possibility of a workpiece to the workpiece attachment unit can be advantageously achieved, in particular in any rotational position of the tool holder unit relative to the drive unit.

[0010] It is further proposed that the portable machine tool comprise at least one gear housing on which the workpiece support unit can be arranged. Preferably, the workpiece support unit can be arranged on the gear housing by means of at least one fastening element of the workpiece support unit that would appear appropriate to a person skilled in the art. Preferably, the tool holder unit is rotatably mounted on the gear housing by means of the pivot bearing unit. The gear housing can be designed as a pot-shaped or a shell-shaped housing. Furthermore, it is conceivable for the gear housing to be formed at least partially in one piece or separately from a motor housing of a housing unit of the portable machine tool.Advantageously, precise guidance of the portable machine tool during machining of a workpiece can be enabled, in particular since the workpiece support unit can be arranged in the direct vicinity of the tool holder unit and thus in the immediate vicinity of the machining tool device.

[0011] It is also proposed that the portable machine tool have at least one operating unit comprising at least one operating element that can be operated with the palm of a hand or with at least one finger depending on a rotational position of the tool holder unit. An “operating unit” is to be understood here in particular as a unit that has at least one component that can be actuated directly by an operator and that is intended to influence and / or change a process and / or a state of a unit coupled to the operating unit by actuation and / or by inputting parameters. Preferably, the operating unit, in particular the operating element, is intended to close and / or open an electrical circuit for starting up and / or decommissioning the drive unit.Particularly preferably, the portable machine tool is designed in such a way that a tool change for aligning cutting elements for machining a workpiece can be avoided after a rotation of the tool holder unit by rotating the portable machine tool about the drive axis of the drive unit. As a result, the operating element can be operated with the palm of the hand in a rotational position of the tool holder unit, and after a rotation of the tool holder unit and the portable machine tool, the operating element can be operated with at least one finger.The portable machine tool thus comprises at least one drive unit, at least one tool holder unit designed to receive a machining tool device, at least one pivot bearing unit for rotatably mounting the tool holder unit relative to the drive unit, and at least one operating unit comprising at least one operating element that can be operated with the palm of the hand or with at least one finger depending on a rotational position of the tool holder unit. The configuration according to the invention thus advantageously enables a high level of operating comfort. After rotating the tool holder unit, an operator can advantageously machine a workpiece without changing tools, in particular without rotating a machining tool device clamped in the tool holder unit. This advantageously saves time when machining a workpiece.

[0012] Furthermore, it is proposed that the pivot bearing unit have at least one axis of rotation which runs at least substantially transversely to a drive axis of the drive unit. Preferably, the axis of rotation of the tool holder unit runs at least substantially perpendicular to the drive axis. The term "substantially perpendicular" is intended here to define in particular an orientation of a direction relative to a reference direction, wherein the direction and the reference direction, in particular viewed in a plane, enclose an angle of 90° and the angle has a maximum deviation of in particular less than 8°, advantageously less than 5°, and particularly advantageously less than 2°. By means of the configuration according to the invention, a compact design of the portable machine tool can be enabled.

[0013] Furthermore, a machine tool system is proposed with at least one portable machine tool according to the invention and with at least one machining tool device comprising at least one cutting strand and at least one guide unit. A "cutting strand" is to be understood here in particular as a unit that is intended to locally disrupt the atomic cohesion of a workpiece to be machined, in particular by mechanically separating and / or mechanically removing material particles from the workpiece. Preferably, the cutting strand is intended to separate the workpiece into at least two physically separate parts and / or to at least partially separate and / or remove material particles from 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 circumference of the guide unit. A "guide unit" should be understood here in particular as a unit that is intended 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 specify a possibility of movement of the cutting strand along the cutting direction. Preferably, the guide unit has at least one guide element, in particular a guide groove, through which the cutting strand is guided. Preferably, the cutting strand, viewed in a cutting plane, is guided along an entire circumference of the guide unit by means of the guide element, in particular the guide groove.The term "cutting plane" is intended here to define, in particular, a plane in which the cutting strand, in at least one operating state, is moved along a circumference of the guide unit in at least two mutually opposite cutting directions relative to the guide unit. When machining a workpiece, the cutting plane is preferably oriented at least substantially transversely to a workpiece surface being machined. "At least substantially transversely" is intended here to mean, in particular, an orientation of a plane and / or a direction relative to another plane and / or another direction, which preferably deviates from a parallel orientation of the plane and / or the direction relative to the another plane and / or the another direction.However, it is also conceivable that the cutting plane is aligned at least substantially parallel to the workpiece surface to be machined when machining a workpiece, in particular when the cutting strand is designed as an abrasive, etc.

[0014] A "cutting direction" is understood here, in particular, to mean a direction along which the cutting strand is moved in at least one operating state as a result of a drive force and / or a drive torque, particularly in the guide unit, to create a cutting gap and / or to separate and / or remove material particles from a workpiece to be machined. Preferably, in one operating state, the cutting strand is moved along the cutting direction relative to the guide unit. The cutting strand and the guide unit preferably together form a closed system.The term “closed system” is intended here, in particular, to define a system comprising at least two components which, by means of an interaction, retain a functionality when the system is disassembled from a system higher up the system, such as a machine tool, and / or which are captively connected to one another when the system is disassembled from the machine tool, in particular when disassembled from a tool holder of the machine tool. Preferably, the at least two components of the closed system are connected to one another in a way that is at least essentially inseparable from one another by an operator. “At least essentially inseparable” is understood here, in particular, to mean a connection of at least two components that can only be separated with the aid of separating 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. By means of the inventive design of the machine tool system, a compact machine tool can advantageously be realized that enables a high removal of workpiece particles.

[0015] It is further proposed that the portable machine tool comprise at least one positioning unit designed to fix the tool-holding unit in at least one position relative to the drive unit, in which a longitudinal axis of the guide unit is aligned at least substantially parallel to a drive axis of the drive unit. This alignment of the guide unit relative to the drive unit corresponds to a reciprocating saw function rotational position of the tool-holding unit. By means of the configuration according to the invention, a portable machine tool that is comfortable to operate can advantageously be achieved. In particular, precise machining of workpieces can advantageously be achieved, since accurate guidance of the portable machine tool can be enabled.

[0016] The portable machine tool and / or the machine tool system according to the invention should not be limited to the application and embodiment described above. In particular, the portable machine tool and / or the machine tool system according to the invention can have a number of individual elements, components, and units that differs from the number stated herein in order to fulfill a functionality described herein. drawing

[0017] Further advantages will become apparent from the following description of the drawings. The drawings illustrate an exemplary embodiment of the invention. The drawings, the description, and the claims contain numerous features in combination. Those skilled in the art will also expediently consider the features individually and combine them into useful further combinations.

[0018] They show: Fig. 1 a machine tool system according to the invention with at least one portable machine tool according to the invention and with a machining tool device in a schematic representation, Fig. 2 the machine tool system according to the invention in a version to that shown in Fig. 1 shown alternative rotational position of a tool holder unit of the portable machine tool according to the invention in a schematic representation and Fig. 3 a detailed view of the machining tool device in a state disassembled from the portable machine tool according to the invention in a schematic representation. Description of the embodiment

[0019] Fig. 1 shows a portable machine tool 10 with a machining tool device 16 arranged in a tool holder unit 14. The portable machine tool 10 and the machining tool device 16 together form a machine tool system 44. The portable machine tool 10 is designed as a handheld power tool. The portable machine tool 10 comprises at least one drive unit 12, at least the tool holder unit 14, which is intended to receive the machining tool device 16, at least one pivot bearing unit 18 for rotatably supporting the tool holder unit 14 relative to the drive unit 12, and at least one workpiece support unit 22, which comprises at least one stationary workpiece support surface 24, which can be placed against the workpiece during machining of a workpiece. The tool holder unit 14 is intended for a positive and / or non-positive connection to the machining tool device 16.The tool holder unit 14 can be designed as a bayonet lock and / or as another coupling device that appears appropriate to a person skilled in the art.

[0020] Furthermore, the tool holder unit 14 is provided to operatively connect the machining tool device 16 to the portable machine tool 10. Thus, the tool holder unit 14 is provided to drive-connect the machining tool device 16, which comprises at least one cutting strand 46 and a guide unit 48, to the portable machine tool 10. The portable machine tool 10 has a housing unit that encloses the drive unit 12 and a gear unit 54 of the portable machine tool 10. For this purpose, the housing unit comprises at least one motor housing 56 and at least one gear housing 36. The motor housing 56 and the gear housing 36 are at least partially formed as one piece. The motor housing 56 and the gear housing 36 have a shell construction.However, it is also conceivable for the motor housing 56 and the gear housing 36 to have a pot design and / or to be formed separately from one another and to be fixable to one another by means of at least one fastening element that would appear appropriate to a person skilled in the art. The drive unit 12 and the gear unit 54 are operatively connected to one another in a manner already known to a person skilled in the art to generate a drive torque that can be transmitted to the machining tool device 16 and / or a drive force that can be transmitted to the machining tool device 16. In this case, the drive unit 12 and / or the gear unit 54 are intended to be coupled to the cutting strand 46 by means of the tool holder unit 14 in an assembled state. The gear unit 54 of the portable power tool 10 is designed as an angular gear. The drive unit 12 is designed as an electric motor unit.However, it is also conceivable that the drive unit 12 and / or the transmission unit 54 have a different design that appears appropriate to a person skilled in the art.

[0021] The tool holder unit 14 is rotatably mounted relative to the drive unit 12 by means of the pivot bearing unit 18, at least when connected to the machining tool device 16. The tool holder unit 14 has the possibility of movement along at least one path and / or about an axis, which is independent of a purely closing movement of the tool holder unit 14 for operatively connecting the machining tool device 16 to the portable machine tool 10 and / or independent of a purely opening movement of the tool holder unit 14 for releasing the operative connection of the machining tool device 16 to the portable machine tool 10. The tool holder unit 14 can be rotated for machining a workpiece with the machining tool device 16, which is operatively connected to the portable machine tool 10 by means of the tool holder unit 14.The tool holder unit 14 can be manually moved into a position desired by the operator as a result of a force applied by an operator to the tool holder unit 14. However, it is also conceivable for the portable power tool 10 to comprise a tool holder unit drive unit (not shown in detail here) designed to drive the tool holder unit 14 to perform a movement independent of the opening movement and / or the closing movement. The tool holder unit drive unit can be designed as an actuator unit, such as an electric motor unit, etc., or as another tool holder unit drive unit that would be deemed appropriate by a person skilled in the art.

[0022] The tool holder unit 14 is rotatably mounted about a rotational axis 42 extending at least substantially transversely to a drive axis 34 of the drive unit 12. The drive axis 34 extends coaxially to a rotational axis of an armature shaft of the drive unit 12. The rotational axis 42 extends at least substantially perpendicularly to the drive axis 34. Thus, the pivot bearing unit 18 has at least one rotational axis 42 extending at least substantially transversely to a drive axis 34 of the drive unit 12. The rotational axis 42 extends coaxially to a rotational axis of an output shaft of the gear unit 54, which can be connected to the machining tool device 16 for driving the cutting strand 46.

[0023] The tool holder unit 14 can be rotated about the rotation axis 42 for machining a workpiece with the machining tool device 16, which is operatively connected to the portable machine tool 10 by means of the tool holder unit 14. In this case, the tool holder unit 14 can be pivoted within a rotation angle range of less than 100°. However, it is also conceivable for the tool holder unit 14 to be pivoted within an angular range deviating from the rotation angle range, such as within an angular range of 180°, etc. The rotation angle range extends from the drive axis 34 in a direction away from the portable machine tool 10.

[0024] The tool holder unit 14 can be fixed in at least two rotational positions relative to the drive unit 12 within the rotational angle range. For this purpose, the portable power tool 10 comprises at least one positioning unit 50, which is provided to fix the tool holder unit 14 in at least one position relative to the drive unit 12 in which a longitudinal axis 52 of the guide unit 48 is aligned at least substantially parallel to the drive axis 34 of the drive unit 12. This rotational position of the tool holder unit 14 relative to the drive unit 12 represents a reciprocating saw function rotational position of the tool holder unit 14. In addition, the tool holder unit 14 can be fixed in a further rotational position relative to the drive unit 12 by means of the positioning unit 50, in which the longitudinal axis 52 of the guide unit 48 is aligned at least substantially transversely to the drive axis 34 of the drive unit 12.This rotational position of the tool holder unit 14 relative to the drive unit 12 represents a jigsaw function rotational position of the tool holder unit 14 (. Fig. 2). For this purpose, the tool holder unit 14 can be rotated about the rotation axis 42 by an angle of less than 100°, starting from the reciprocating saw function rotation position. In particular, the tool holder unit 14 can be rotated about the rotation axis 42 by an angle between 80° and 90°, starting from the reciprocating saw function rotation position. To transfer the tool holder unit 14 into the reciprocating saw function rotation position, the tool holder unit 14 can be rotated about the rotation axis 42 by an angle between 80° and 90°, starting from the jigsaw function rotation position. To fix the tool holder unit 14 in at least one position relative to the drive unit 12, the positioning unit 50 can have at least one locking element or another element that would be deemed appropriate by a person skilled in the art, such as a clamping element, etc.

[0025] The portable machine tool 10 comprises the workpiece support unit 22 for contact with a workpiece and / or for supporting weight forces and / or machining forces on a workpiece. In this case, the stationary workpiece support surface 24 can be applied to the workpiece when the tool holder unit 14 is in a reciprocating saw function rotational position during machining of a workpiece. The stationary workpiece support surface 24 extends at least substantially perpendicular to the drive axis 34 of the drive unit 12. Furthermore, the longitudinal axis 52 of the guide unit 48 is aligned at least substantially perpendicular to the stationary workpiece support surface 24 when the tool holder unit 14 is in the reciprocating saw function rotational position. The longitudinal axis 52 of the guide unit 48 and the drive axis 34 of the drive unit 12 extend in a common plane.However, it is also conceivable that the longitudinal axis 52 of the guide unit 48 and the drive axis 34 of the drive unit 12 extend in planes that are offset at least substantially parallel to one another.

[0026] Furthermore, the workpiece support unit 22 comprises at least one further stationary workpiece support surface 26, which, depending on a rotational position of the tool holder unit 14, can be placed on the workpiece as an alternative to the workpiece support surface 24 during machining of a workpiece. The further stationary workpiece support surface 26 extends at least substantially transversely to the stationary workpiece support surface 24. Furthermore, the further stationary workpiece support surface 26 extends at least substantially transversely to the drive axis 34 of the drive unit 12. In addition, the longitudinal axis 52 of the guide unit 48 is aligned at least substantially transversely to the further stationary workpiece support surface 26 in the reciprocating saw function rotational position of the tool holder unit 14. The workpiece support surface 24 and the further workpiece support surface 26 enclose an angle 58 that deviates from 90°.However, it is also conceivable that the angle 58 enclosed by the workpiece contact surface 24 and the further workpiece contact surface 26 has a value of 90°. The further stationary workpiece contact surface 26 can be placed against the workpiece in a jigsaw function rotational position of the tool holder unit 14 during machining of a workpiece (. Fig. 2).

[0027] The workpiece support surface 24 and the further workpiece support surface 26 are arranged on at least one workpiece support element 28 of the workpiece support unit 22. The workpiece support element 28 forms a base plate or a sliding block of the portable machine tool 10. The workpiece support element 28 is arranged on the gear housing 36. The workpiece support element 28 can be fixed to the gear housing 36 by means of at least one fastening element of the workpiece support unit 22 that would be deemed appropriate by a person skilled in the art. Thus, the workpiece support unit 22 can be arranged on the gear housing 36. In this case, the workpiece support element 28 is designed differently from the gear housing 36.

[0028] The workpiece support surface 24 is arranged on a leg 30 of the workpiece support element 28 of the workpiece support unit 22, which is angled relative to another leg 32 of the workpiece support element 28, on which the further workpiece support surface 26 is arranged. The leg 30 and the further leg 32 together form an L-shaped configuration of the workpiece support element 28, particularly when viewed in a plane extending at least substantially perpendicular to the rotation axis 42. Thus, the workpiece support surface 24 and / or the further workpiece support surface 26 extend / extend at least substantially transversely to a drive axis 34 of the drive unit 12.

[0029] Furthermore, the portable machine tool 10 comprises at least one operating unit 38, which comprises at least one operating element 40, which can be operated with the palm of the hand or with at least one finger depending on a rotational position of the tool holder unit 14. The portable machine tool 10 is designed such that a tool change for aligning cutting elements 68, 70 of the cutting strand 46 for machining a workpiece after a rotation of the tool holder unit 14 can be avoided by rotating the portable machine tool 10 about the drive axis 34 of the drive unit 12.As a result, the operating element 40 can be operated with the palm of a hand when the tool holder unit 14 is in a jigsaw function rotational position, and after rotation of the tool holder unit 14 and the portable power tool 10, the operating element 40 can be operated with at least one finger when the tool holder unit 14 is in the saber saw function rotational position. The operating element 40 is designed as a ratchet switch actuating element. Thus, the operating element 40 is pivotally mounted. A movement axis of the operating element 40 runs at least substantially transversely to the drive axis 34 and, in particular, additionally at least substantially parallel to the rotational axis 42. However, it is also conceivable for the operating element 40 to have another configuration that would be deemed appropriate by a person skilled in the art, such as, for example, a configuration as a push-button actuating element, etc., which has a movement axis that runs at least substantially transversely to the drive axis 34 and, in particular, additionally at least substantially transversely to the rotation axis 42. Furthermore, the operating unit 38 comprises at least one locking element 60 for locking the operating element 40 in an unactuated position.

[0030] Fig.3 shows the machining tool device 16 in a state decoupled from the tool holding unit 14. The cutting strand 46 and the guide unit 48 together form a closed system. The guide unit 48 is designed as a guide rail. The cutting strand 46 is guided by the guide unit 48 during a circumferential movement around the guide unit 48. For this purpose, the guide unit 48 has at least one guide element. The guide element of the guide unit 48 is designed as a guide groove that extends in a cutting plane of the cutting strand 46 along a circumference of the guide unit 48. The cutting strand 46 is guided by means of edge regions of the guide unit 48 that delimit the guide groove.However, it is also conceivable for the guide element of the guide unit 48 to be designed in a different manner that would be deemed appropriate by a person skilled in the art, such as, for example, as a rib-like formation on the guide unit 48 that engages a recess in the cutting strand 46. Viewed in a plane perpendicular to the cutting plane, the cutting strand 46 is surrounded on three sides by the edge regions that delimit the guide groove. During operation, the cutting strand 46 is moved circumferentially along the circumference in the guide groove relative to the guide unit 48.

[0031] Furthermore, the machining tool device 16 has a coupling recess 62, into which a drive gear of the tool holder unit 14 and / or the gear unit 54 engages when the machining tool device 16 is arranged on the tool holder unit 14 and is driveably connectable to the cutting strand 46. However, it is also conceivable for the machining tool device 16 to have a torque transmission element mounted in the guide unit 48, into which a shaft of the tool holder unit 14 and / or the gear unit 54 engages, etc. The cutting strand 46 comprises a plurality of interconnected cutter support elements 64, 66, each of which is connected to one another by means of a connecting element (not shown in detail here) of the cutting strand 46. A person skilled in the art will select a suitable number of cutter support elements 64, 66 for the cutting strand 46 depending on the application.The blade carrier elements 64, 66 of the cutting strand 46 each have a recess, which, in an assembled state, is arranged on a side of the respective blade carrier element 64, 66 facing the drive gear. The drive gear of the tool holder unit 14 and / or the gear unit 54 engages in the recesses in at least one operating state to drive the cutting strand 46.

[0032] Furthermore, the cutting strand 46 has cutting elements 68, 70. The cutting elements 68, 70 are each formed integrally with one of the blade carrier elements 64, 66. However, it is also conceivable for the cutting elements 68, 70 to be formed separately from the blade carrier elements 64, 66. The number of cutting elements 68, 70 depends on the number of blade carrier elements 64, 66. A person skilled in the art will select a suitable number of cutting elements 68, 70 depending on the number of blade carrier elements 64, 66. The cutting elements 68, 70 are provided to enable the separation and / or removal of material particles from a workpiece to be machined. The cutting elements 68, 70 can be designed, for example, as full chisels, half chisels or other types of cutting edges that appear appropriate to a person skilled in the art and are intended to enable the separation and / or removal of material particles from a workpiece to be machined.The cutting strand 46 is endless. Thus, the cutting strand 46 is designed as a cutting chain. The blade carrier elements 64, 66 are designed as chain links that are connected to one another by means of the connecting elements. However, it is also conceivable that the cutting strand 46, the blade carrier elements 64, 66, and / or the connecting elements are designed in a different manner that would be deemed appropriate by a person skilled in the art.

Claims

[1] Portable machine tool, in particular hand-held machine tool, with at least one drive unit (12), with at least one tool receiving unit (14) which is intended to receive a machining tool device (16), with at least one rotary bearing unit (18) for rotatably mounting the tool receiving unit (14) relative to the drive unit (12) and with at least one workpiece contact unit (22) which comprises at least one stationary workpiece contact surface (24) which can be placed on the workpiece during machining of a workpiece, wherein the workpiece contact unit (22) comprises at least one further stationary workpiece contact surface (26) which, depending on a rotational position of the tool receiving unit (14), can be placed on the workpiece as an alternative to the workpiece contact surface (24) during machining of a workpiece, characterized bythat the workpiece contact surface (24) is arranged on a leg (30) of the workpiece contact element (28) of the workpiece contact unit (22), which is angled relative to a further leg 32 of the workpiece contact element (28) on which the further workpiece contact surface (26) is arranged. [2] Portable machine tool according to claim 1, characterized by that the workpiece contact surface (24) and the further workpiece contact surface (26) are arranged on at least one workpiece contact element (28) of the workpiece contact unit (22). [3] Portable machine tool according to one of the preceding claims, characterized by in that the workpiece contact surface (24) is arranged on a leg (30) of a workpiece contact element (28) of the workpiece contact unit (22), which leg is angled relative to a further leg (32) of the workpiece contact element (28) on which the further workpiece contact surface (26) is arranged. [4] Portable machine tool according to one of the preceding claims, characterized by that the workpiece contact surface (24) and the further workpiece contact surface (26) enclose an angle (58) deviating from 90°. [5] Portable machine tool according to one of the preceding claims, characterized by that the workpiece contact surface (24) and / or the further workpiece contact surface (26) run / runs at least substantially transversely to a drive axis (34) of the drive unit (12). [6] Portable machine tool according to one of the preceding claims, characterized by at least one gear housing (36) on which the workpiece support unit (22) can be arranged. [7] Portable machine tool according to one of the preceding claims, characterized byat least one operating unit (38) comprising at least one operating element (40) which can be operated with the palm of a hand or with at least one finger depending on a rotational position of the tool holding unit (14). [8] Portable machine tool according to one of the preceding claims, characterized by that the rotary bearing unit (18) has at least one axis of rotation (42) which runs at least substantially transversely to a drive axis (34) of the drive unit (12). [9] Machine tool system with at least one portable machine tool according to one of the preceding claims and with at least one machining tool device (16) which comprises at least one cutting strand (46) and at least one guide unit (48). [10] Machine tool system according to claim 9, characterized byin that the portable machine tool comprises at least one positioning unit (50) which is provided for fixing the tool holding unit (14) in at least one position relative to the drive unit (12) in which a longitudinal axis (52) of the guide unit (48) is aligned at least substantially parallel to a drive axis (34) of the drive unit (12).

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