MACHINE TOOL DEVICE, MACHINE TOOL AND SYSTEM

Description

State of the art

[0001] A machine tool device has already been proposed, comprising a clamping unit for fixing a tool, a protective hood which at least partially surrounds a tool holding area for the tool, and an actuating unit for actuating the clamping unit.

[0002] EP 1 859 899 A1 was also researched as the state of the art. Disclosure of the invention

[0003] The invention relates to a machine tool device, in particular a hand-held circular saw device, with a clamping unit for fixing a tool, in particular a circular saw blade, with a protective hood which at least partially surrounds a tool holding area for the tool, and with an actuating unit for actuating the clamping unit.

[0004] It is proposed that the machine tool device include a safety unit that blocks the actuating unit when the protective hood is at least partially open. Advantageously, this allows for a machine tool device with a particularly high level of operator safety. It also advantageously prevents the tool from being unintentionally released from the clamping unit by actuating the unit. Furthermore, it advantageously prevents the tool from falling when the clamping unit is released. Advantageously, this results in a particularly low risk of injury to the user. Finally, it advantageously allows for quick and easy tool changes while maintaining a particularly high level of user safety. The safety unit is preferably of a mechanical design.Preferably, the actuating unit is blocked or released by the safety unit, particularly automatically, depending on the position of the protective cover. The safety unit is preferably actuated depending on the position of the protective cover, particularly automatically. In particular, the safety unit releases the actuating unit when the protective cover is closed, preferably automatically. The position of the protective cover indicates, in particular, whether the protective cover is at least partially open or closed. Alternatively, it is also conceivable that the safety unit is at least partially electrically designed. For example, it is conceivable that the safety unit includes a detection unit for detecting the position of the protective cover.The detection unit can, for example, comprise a mechanical sensor, an optical sensor, or another sensor deemed suitable by a person skilled in the art for detecting the position of the protective hood. It is conceivable that the safety unit includes a control unit, which is specifically configured to evaluate a signal from the detection unit and, depending on this, to block or release the actuating unit. The control unit comprises, in particular, at least a processor and a memory element, as well as an operating program stored on the memory element. The memory element is preferably designed as a digital storage medium, for example, a hard drive or the like. It is also conceivable that the control unit of the safety unit is formed by a control unit of the machine tool.

[0005] The clamping unit is particularly tool-free and preferably operable by means of the actuating unit. The clamping unit is preferably fixed, particularly rotationally fixed, to a machine tool, especially to an output spindle of an output unit of the machine tool. Alternatively, it is conceivable that the clamping unit is detachably mounted to the machine tool, particularly to the output spindle. The clamping unit is preferably designed for the attachment of the tool to the machine tool fixture, particularly without tools. "Designed" is understood to mean specially configured, specially designed, and / or specially equipped. The phrase "designed" means that an object is intended for a specific function and / or performs this specific function in at least one application and / or operating condition.Preferably, the tool, particularly when fixed to the clamping unit, can be driven in a rotating or oscillating manner, especially about a rotational axis of a connection interface of the tool. Preferably, the tool, particularly when fixed to the machine tool by means of the clamping unit, can be driven in a rotating or oscillating manner by the output spindle. The clamping unit has an outer contour, particularly when viewed in a plane extending at least substantially perpendicular to an output axis of the output spindle, which is designed correspondingly to a contour of the connection interface.The term "essentially perpendicular" can be understood as an orientation of a direction relative to a reference direction, wherein the direction and the reference direction, particularly when viewed in a projection plane, enclose an angle of 90° and the angle has a maximum deviation of, in particular, less than 8°, advantageously less than 5°, and most advantageously less than 2°. The contour of the connection interface is defined, in particular, by the course of an inner boundary contour and an outer boundary contour of the connection interface. The output axis preferably runs, in a state where the tool is fixed to the clamping unit, at least substantially parallel to the axis of rotation of the connection interface.

[0006] Preferably, the output unit is designed to transmit a rotational and / or oscillatory movement about the output axis to the tool fixed to the output unit by means of the clamping unit. Preferably, the output unit is operatively connected to a drive unit of the machine tool in a manner known to those skilled in the art, in particular via at least one drive pinion of the drive unit. The output unit comprises, in particular, at least one sleeve and / or at least one hollow shaft, especially a hollow spindle, which forms the output spindle. The rotational and / or oscillatory movement of the output unit is preferably generated by an interaction of the output unit with the drive unit of the machine tool, which comprises at least one electric motor.

[0007] According to an advantageous further development, it is proposed that the actuating unit has a control element which can be moved at least partially along the protective hood for actuation. This design of the machine tool device advantageously allows a tool to be released particularly easily and quickly from a position fixed to the clamping unit. Advantageously, a tool can be changed particularly conveniently and quickly. Advantageously, a particularly fast workflow can be ensured. Advantageously, a particularly space-saving and simultaneously safe actuation of the control element can be achieved. Advantageously, an actuating unit, in particular a control element, can be provided which is operable in a particularly compact manner. Thus, damage to the actuating unit, especially the control element, can be counteracted in a particularly simple and effective way by design.Advantageously, a particularly ergonomic operation of the actuating unit, especially the control element, can be achieved. Advantageously, the risk of operator injury during operation of the actuating unit can be prevented. The control element is specifically designed for manual operation by a user. Preferably, the control element is movable by rotation about a control element rotation axis along the protective hood. Preferably, the control element is movable for actuation at least substantially parallel to a surface, particularly an outer surface, of the protective hood. "Substantially parallel" here refers in particular to an alignment of a direction relative to a reference direction, especially in a plane, wherein the direction has a deviation from the reference direction of preferably less than 8°, advantageously less than 5°, and particularly advantageously less than 2°.Preferably, the actuating unit comprises at least one lever arm, by means of which the operating element, in particular, can be moved about the operating element's axis of rotation. The operating element is preferably rotatably mounted on a part of the protective hood, preferably by means of the lever arm. Alternatively, it is also conceivable that the operating element, in particular the lever arm, is movably, preferably rotatably, mounted on a housing element of the machine tool, which is preferably different from the protective hood, or the like. The operating element is preferably arranged at a distance from the protective hood. For actuation, the operating element is preferably movable at least partially along the protective hood at a constant distance from the protective hood.Alternatively, it is also conceivable that the operating element rests against the protective hood, preferably guided by the protective hood, in particular the surface of the protective hood facing the operating element, during a movement along the protective hood. Preferably, only the one operating element needs to be actuated to release the tool from a state fixed to the clamping unit.

[0008] It is further proposed that the operating element be movable about an operating element rotation axis, wherein a movement of the operating element about the operating element rotation axis can generate a movement of an actuating element of the clamping unit that is at least substantially parallel to the operating element rotation axis. The operating element rotation axis is, in particular, at least substantially parallel to the output axis of the output spindle and / or the rotation axis of the tool's connection interface when the tool is fixed to the clamping unit. A movement of the operating element to actuate the clamping unit preferably takes place in a plane that is at least substantially perpendicular to the output axis and / or the rotation axis of the tool when the tool is fixed to the clamping unit.The actuating element is designed, for example, as a bolt, a pin, or another actuating element that would be considered suitable by a person skilled in the art. The clamping unit preferably has at least two states, in particular a release state and a fastening state. In the release state, the tool can preferably be removed from the clamping unit, in particular from a mounting position on the clamping unit, or positioned in the mounting position on the clamping unit. In the fastening state, the tool is fixed to the clamping unit in a state arranged on the clamping unit, in particular in the mounting position. By moving the actuating element of the clamping unit, the clamping unit can be moved, in particular, from the fastening state to the release state or vice versa. Advantageously, a particularly ergonomic arrangement of the actuating unit can be implemented.A particularly high level of user-friendliness can be achieved as a benefit.

[0009] Furthermore, it is proposed that the actuating unit has a ramp-shaped actuating element. The actuating element is specifically designed to interact with the actuating element of the clamping unit to actuate the clamping unit. Preferably, the actuating element is designed to transmit the movement of the operating element, particularly via the lever arm, to the actuating element of the clamping unit. Preferably, the actuating element is arranged on the lever arm. The actuating element is preferably connected to the operating element via the lever arm. Preferably, the actuating element is attached to the lever arm, particularly in a rotationally fixed manner, for example, by means of a screw connection, a snap-fit ​​connection, or the like. It is conceivable that the lever arm is formed in one piece or in multiple parts. Alternatively, it is conceivable that the actuating element is formed at least partially integrally with the lever arm.The phrase "at least one unit or object, in particular the lever arm, and at least one further unit or object, in particular the actuating means, are at least partially formed integrally" is to be understood in particular as meaning that at least one element of the unit or object is formed integrally with at least one further element of the further unit or object. "Integrated" can be understood to mean at least a materially bonded connection, for example by a welding process, an adhesive bonding process, an injection molding process, and / or another process that would appear appropriate to a person skilled in the art, and / or advantageously formed in one piece, such as by manufacturing from a single casting and / or by manufacturing using a single- or multi-component injection molding process, and advantageously from a single blank.The operating element is preferably attached to the lever arm, in particular in a rotationally fixed manner, for example by means of a screw connection, a snap-fit ​​connection, or the like. Alternatively, it is also conceivable that the operating element is at least partially formed integrally with the lever arm. In particular, the actuating means and the operating element are arranged at opposite ends of the lever arm. Advantageously, the design allows for a particularly simple conversion of a movement of the operating element along the protective hood into a movement for actuating the clamping unit. Advantageously, a particularly smooth release of the clamping unit can be achieved.

[0010] Furthermore, it is proposed that the actuating unit include an actuating means, in particular the one mentioned above, which at least partially surrounds the operating element's axis of rotation. Preferably, the actuating means surrounds the operating element's axis of rotation within an angular range of no more than 75°. More preferably, the angular range within which the actuating means surrounds the operating element's axis of rotation is at least 20°. Advantageously, this allows for particularly comfortable and smooth actuation of the clamping unit.

[0011] Furthermore, it is proposed that the clamping unit can be released by an actuation path of the operating element along the protective hood of at least 40°, particularly around the axis of rotation of the operating element. Preferably, the clamping unit can be released by an actuation path of the operating element starting from an end position of the operating element in the clamping unit's fixed state along the protective hood of at least 40°. Alternatively, however, it is also conceivable that the actuation unit is designed such that the actuation path, particularly for releasing the clamping unit, preferably starting from the end position of the operating element in the clamping unit's fixed state, is less than 40°.Preferably, the actuation path of the control element, starting from an end position of the control element in the released state of the clamping unit, to generate the tightened state is shorter than the actuation path to generate the released state, starting from the end position of the control element in the tightened state of the clamping unit. Advantageously, the clamping unit can be released particularly easily and quickly, while simultaneously preventing unintentional release of the clamping unit. Advantageously, tool changes can be carried out particularly quickly and conveniently. Advantageously, a particularly high level of ease of use can be achieved when releasing the clamping unit.

[0012] Furthermore, it is proposed that the actuation path of the control element along the protective hood for actuating the clamping unit, particularly the previously mentioned one, be a maximum of 75°, especially around the axis of rotation of the control element. Preferably, the actuation path of the control element along the protective hood for releasing the clamping unit is a maximum of 75°, especially around the axis of rotation of the control element, preferably starting from the end position of the control element in the clamping unit's fixed state. In an alternative embodiment of the actuating unit, it is also conceivable that the actuation path of the control element along the protective hood for actuating the clamping unit, especially for releasing the clamping unit from the fixed state, is more than 75°, especially around the axis of rotation of the control element, for example, a maximum of 90°, preferably a maximum of 135°, and particularly preferably a maximum of 180°. Advantageously, the clamping unit can be released particularly conveniently and quickly.Advantageously, the space required for operating, especially releasing, the clamping unit can be kept particularly small. Advantageously, a particularly compact operating unit can be provided.

[0013] It is further proposed that the actuation path has a free travel of at least 20°, particularly around the axis of rotation of the control element. Specifically, the free travel extends from the end position of the control element in the clamping unit's fixed position. In particular, the actuating unit, preferably the actuating means, exerts an actuating effect, in particular an actuating force, on the clamping unit, especially the actuating element of the clamping unit, only in a state of the control element located outside the free travel. The clamping unit, especially the actuating element, is preferably free from any actuating effect, in particular an actuating force, by the actuating unit, especially the actuating means of the actuating unit, in a state of the control element located within the free travel.It is conceivable that the actuating means of the actuating unit is arranged at a distance from the actuating element of the clamping unit when the operating element is within its free travel. Alternatively, it is also conceivable that the actuating means of the actuating unit is in contact with the actuating element of the clamping unit when the operating element is within its free travel. Preferably, the actuating means, in particular a force transmission surface of the actuating element, is in contact with the actuating element of the clamping unit at least when the operating element is outside its free travel. Preferably, the actuating means, in particular the force transmission surface of the actuating element, exerts a force on the actuating element of the clamping unit to actuate, in particular to release, the clamping unit, at least when the operating element is outside its free travel.The design of the actuating unit offers the advantage of a simple and effective way to prevent unintentional release of the clamping unit. This also allows for a particularly high level of workplace safety.

[0014] Furthermore, it is proposed that the operating element, viewed radially, be arranged on the side of the protective hood facing away from the tool holder area. The radial direction refers in particular to the operating element's axis of rotation. Advantageously, an actuating unit with a particularly safe operating element arrangement can be provided. Advantageously, this prevents the operator from reaching into the tool holder area, especially into the tool itself. Advantageously, the risk of injury when operating the control element can be kept particularly low. Advantageously, particularly convenient operation of the control element can be achieved.

[0015] Furthermore, it is proposed that the operating element be arranged on a side of the protective hood facing away from the operator side in one mounting state of the clamping unit, particularly the one already mentioned. Preferably, an operator is located on the operator side in at least one operating state. A main handle of the machine tool, in particular the machine tool attachment, or the like, is preferably arranged on the operator side. Advantageously, the arrangement of the operating element according to the invention allows for particularly simple and effective prevention of unintentional actuation, in particular release, of the clamping unit in at least one operating state.

[0016] Furthermore, it is proposed that the locking unit comprises a locking element, wherein closing the protective cover moves the locking element into an unlocked position. The locking element is, for example, designed as a pin, a hook, a ramp-shaped element, or as another locking element that would appear suitable to a person skilled in the art. Preferably, the actuating unit can be actuated in the unlocked position of the locking element. Preferably, the operating element is movable along the protective cover in the unlocked position of the locking element. In particular, the actuating unit, preferably the operating element, is free from any engagement, especially any force, by the locking unit, preferably the locking element, in the unlocked position of the locking element. Preferably, the locking unit can be actuated by a movement of at least a part of the protective cover. In particular, the locking element can be moved by a movement of at least a part of the protective cover.Preferably, the locking element can be moved from an unlocked state to a locked state and / or from the locked state to the unlocked state by moving at least part of the protective cover. In the unlocked state, the locking element is in the unlocked position. In the locked state, the locking element is in the locked position. Preferably, the locking element can only be moved to the unlocked state when the protective cover is closed. Preferably, the locking unit is designed such that the locking element automatically moves to the locked state when the protective cover is open, for example, by means of a gravity-controlled mechanism, a spring element, or the like. Advantageously, closing the protective cover can be used to unlock the locking unit. Advantageously, the actuating unit can be automatically actuated by closing the protective cover.A particularly high level of user-friendliness can be achieved as a benefit.

[0017] Furthermore, it is proposed that the locking unit comprise a locking element designed as a pin, in particular the previously mentioned one, which engages in the actuating unit when the protective cover is at least partially open. Preferably, the locking element acts on the lever arm of the actuating unit when the protective cover is at least partially open. It is conceivable that the lever arm has a recess, a notch, or the like in which the locking element is arranged in the locked position. In particular, when the protective cover is at least partially open, the locking element blocks the movement of the operating element along the protective cover. Preferably, in the locked position, the locking element blocks a movement, in particular a rotation, of the lever arm, especially about the axis of rotation of the operating element.Advantageously, the clamping unit can be operated particularly effectively and with a simple design, thus preventing the tool from falling out when the protective hood is at least partially open.

[0018] Furthermore, it is proposed that the locking unit comprises a locking element, in particular the one already mentioned, which can be moved by rotation about a locking element rotation axis into an unlocked position, in particular the one already mentioned, or into a locked position, in particular the one already mentioned. For example, the locking unit, in particular the locking element, is rotatably mounted on a part of the protective hood, on the housing element of the machine tool, or on another housing element of the machine tool. Advantageously, a particularly space-saving and smooth-running locking unit can be provided.

[0019] Furthermore, it is proposed that the rotation of the locking element can be generated by moving at least part of the protective hood. Preferably, the protective hood, and in particular at least part of the protective hood, is arranged relative to the locking element such that, when the protective hood is closed, at least part of the protective hood abuts the locking unit and moves the locking element into the unlocked position. Alternatively, it is also conceivable that the locking unit, and in particular at least the locking element, is mechanically, and preferably directly, connected to the protective hood, and in particular to at least part of the protective hood, regardless of the position of the protective hood. Advantageously, this allows for particularly simple and convenient operation of the locking unit, which is also advantageous in terms of operational safety.

[0020] Furthermore, it is proposed that the protective hood comprises at least an upper part and a lower part, the latter being rotatably arranged relative to the upper part about a protective hood axis. The upper part is preferably fixedly, and in particular rotationally fixed, to the housing element, the further housing element, or an additional housing element of the machine tool. The operating element is preferably movable along the upper part of the protective hood for actuating the clamping unit. It is conceivable that the upper part of the protective hood has a ramp or the like, along which the operating element can be moved to actuate the clamping unit. The ramp is particularly mounted on a base body of the upper part of the protective hood.It is conceivable that the ramp is formed separately from the base body and attached to it, for example by means of a screw connection, a snap-fit ​​connection, or the like, or that the ramp is formed integrally with the base body. Alternatively, however, it is also conceivable that the upper part of the protective hood is free of a ramp. The upper and lower parts of the protective hood at least partially surround the tool holding area. The lower part of the protective hood is pivotable relative to the upper part, particularly between the open and closed positions of the protective hood. The locking mechanism is preferably actuated by an interaction, particularly a movement, of the lower part of the protective hood. Preferably, when the protective hood is closed, the lower part of the protective hood moves the locking element into the unlocked position.Advantageously, the safety unit can be actuated by a relative movement of the lower part of the protective hood to the upper part, particularly automatically. This allows for a particularly high level of user-friendliness.

[0021] Furthermore, it is proposed that the protective hood's axis of rotation be spaced apart from and at least substantially parallel to the operating element's axis of rotation. Alternatively, it is also conceivable that the protective hood's axis of rotation corresponds to the operating element's axis of rotation. Advantageously, the space requirements of the actuating unit and the protective hood can be kept particularly compact.

[0022] Furthermore, it is proposed that the protective hood's axis of rotation be spaced apart from and at least substantially parallel to the locking element's axis of rotation. This advantageously achieves a particularly favorable force transmission chain between the protective hood and the locking unit for actuating the locking unit. The locking unit can then be actuated with particularly little effort.

[0023] Furthermore, it is proposed that the locking element's axis of rotation be spaced apart from and at least substantially parallel to the operating element's axis of rotation. Advantageously, the space requirements of the actuating unit and the locking unit can be kept particularly compact. Advantageously, a particularly favorable force transmission chain between the locking unit and the actuating unit for locking and / or unlocking the actuating unit can be achieved.

[0024] Furthermore, it is proposed that the protective hood at least partially surrounds the locking unit. Preferably, the locking unit, and in particular at least the locking element, is arranged on a side of the protective hood facing the tool holding area. More preferably, the locking unit, and in particular at least the locking element, is arranged between the upper and lower parts of the protective hood. Advantageously, the locking unit can be protected from damage, especially from direct impacts. The arrangement of the locking unit makes it particularly easy and effective to prevent unintentional unlocking of the locking unit.

[0025] Furthermore, a machine tool, in particular a handheld circular saw, with a machine tool device according to the invention is proposed. The machine tool is preferably designed as a portable machine tool, in particular as a handheld machine tool. Here, "portable machine tool" is understood to mean, in particular, a machine tool for machining workpieces that can be transported by an operator without the need for a transport vehicle. The portable machine tool has, in particular, a mass that is less than 40 kg, preferably less than 10 kg, and most preferably less than 5 kg. Preferably, the machine tool is designed as a handheld circular saw. However, it is also conceivable that the machine tool has another configuration that would appear useful to a person skilled in the art, such as an angle grinder, a table saw, an oscillating machine tool, a grinding machine, etc.Similarly, the design according to the invention advantageously provides a machine tool that enables particularly fast removal and changing of tools on the machine tool. Advantageously, a particularly efficient workflow can be achieved.

[0026] Furthermore, a system comprising a tool, in particular a circular saw blade, and a machine tool according to the invention is proposed. As an alternative to a circular saw blade, it is also conceivable that the tool is designed as a grinding wheel, a cutting wheel, a polishing wheel, or as another tool that would appear useful to a person skilled in the art. Advantageously, a system can be provided that allows for particularly quick and easy removal of the tool from the machine tool. Advantageously, tools can be exchanged particularly quickly and conveniently. Advantageously, particularly efficient operation of the machine tool can be achieved. drawing

[0027] Further advantages become apparent from the following description of the drawing. The drawing illustrates an embodiment of the invention.

[0028] They show: Fig. 1 a schematic view of a system according to the invention with a machine tool according to the invention and a tool arranged on the machine tool, Fig. 2 a perspective exploded view of a machine tool device according to the invention of the machine tool according to the invention, Fig. 3 a perspective sectional view through the machine tool made of Figure 1Fig. 4 a schematic front view of a part of the machine tool according to the invention without the tool in an unlocked state of a locking unit of the machine tool device according to the invention, Fig. 5 a schematic, perspective rear view of a part of the machine tool according to the invention with the tool in the unlocked state of the locking unit, Fig. 6 a schematic front view of the part of the machine tool according to the invention without the tool in a locked state of the locking unit and Fig. 7 a schematic, perspective rear view of a part of the machine tool according to the invention with the tool in the locked state of the locking unit. Description of the exemplary embodiment

[0029] Figure 1Figure 46 shows a system 46 with a tool 14 and a machine tool 44. The machine tool 44 is designed as a portable machine tool, specifically as a hand-held machine tool. The machine tool 44 is designed as a hand-held circular saw. However, it is also conceivable that the machine tool 44 has a different configuration that would appear useful to a person skilled in the art, such as an angle grinder, a table saw, an oscillating machine tool, a grinding machine, or the like. The tool 14 is designed as a circular saw blade. Alternatively, it is also conceivable that the tool 14 is designed as a grinding wheel, a cutting wheel, a polishing wheel, or as another tool 14 that would appear useful to a person skilled in the art.

[0030] The machine tool 44 comprises a machine tool fixture 10. The machine tool fixture 10 comprises a clamping unit 12 for fixing the tool 14. The clamping unit 12 can be operated without tools. The machine tool fixture 10 comprises an actuating unit 20 for actuating the clamping unit 12, in particular without tools. The clamping unit 12 is fixedly, in particular rotationally fixed, to the machine tool 44, in particular to an output spindle of an output unit of the machine tool 44. Alternatively, it is conceivable that the clamping unit 12 is detachably arranged on the machine tool 44, in particular on the output spindle. The clamping unit 12 is designed for fastening the tool 14 to the machine tool fixture 10, in particular without tools.The tool 14 can be driven in a rotating or oscillating manner while fixed to the clamping unit 12, particularly about a rotational axis 52 of a connection interface 54 of the tool 14. The tool 14 can be driven by the output spindle while fixed to the machine tool 44 by means of the clamping unit 12, preferably rotating or oscillating. The clamping unit 12 has an outer contour, particularly when viewed in a plane extending at least substantially perpendicular to an output axis 56 of the output spindle, which is designed correspondingly to a contour of the connection interface 54. The contour of the connection interface 54 is defined by the course of an inner boundary contour and an outer boundary contour of the connection interface 54.The output axis 56 runs at least substantially parallel to the rotation axis 52 of the connection interface 54 when the tool 14 is fixed to the clamping unit 12. The output axis 56 corresponds to the rotation axis 52 of the connection interface 54 when the tool 14 is fixed to the clamping unit 12.

[0031] The clamping unit 12 is designed here as a quick-release clamping device, as disclosed, for example, in WO 2021 / 130026 A1, but with six retaining wings corresponding to the connection interface 54 (see also Figure 2 ).

[0032] Alternatively, it is also conceivable that the clamping unit 12 is designed with four retaining wings according to the quick-release clamping device from WO 2021 / 130026 A1, is designed as a quick-release clamping device such as that disclosed for example in DE 10 2017 213 669 A1, or is designed as another quick-release clamping device that would appear useful to a person skilled in the art.

[0033] The output unit is designed to transmit a rotational and / or oscillatory movement about the output axis 56 to the tool 14, which is fixed to the output unit by means of the clamping unit 12. The output unit is operatively connected to a drive unit of the machine tool 44 in a manner known to those skilled in the art, in particular via at least one drive pinion of the drive unit. The output unit comprises, in particular, at least one sleeve and / or at least one hollow shaft, especially a hollow spindle, which forms the output spindle. The rotational and / or oscillatory movement of the output unit is preferably generated by an interaction of the output unit with the drive unit of the machine tool 44, which comprises at least one electric motor.

[0034] The machine tool device 10 comprises a protective hood 16, which at least partially surrounds a tool holding area 18 for the tool 14. The actuating unit 20 has an operating element 22, which is movable at least partially along the protective hood 16 for actuation. The operating element 22 is designed for manual actuation by a user. The operating element 22 is movable about an operating element rotation axis 24. The operating element 22 can be moved along the protective hood 16 by rotating about the operating element rotation axis 24. The operating element 22 is movable at least substantially parallel to a surface 58, in particular the outer surface, of the protective hood 16 for actuation.

[0035] The actuating unit 20 comprises at least one lever arm 60. The operating element 22 is movable about the operating element's axis of rotation 24 by means of the lever arm 60. The operating element 22 is rotatably mounted on a part of the protective hood 16, in particular on an upper part 38 of the protective hood 16, especially by means of the lever arm 60. The operating element 22 is movable along the upper part 38 of the protective hood to actuate the clamping unit 12. Alternatively, it is also conceivable that the operating element 22, in particular the lever arm 60, is movably, preferably rotatably, mounted on a housing element of the machine tool 44, which is in particular different from the protective hood 16, or the like. The operating element 22 is arranged at a distance from the protective hood 16, in particular from the upper part 38 of the protective hood.The operating element 22 is movable at least partially along the protective hood 16, particularly the upper part 38, while maintaining a constant distance from it. Alternatively, it is also conceivable that the operating element 22 rests against the protective hood 16, and is guided by the protective hood 16, preferably by the surface 58 of the protective hood 16 facing the operating element 22, during a movement along the protective hood 16, particularly the upper part 38. To release the tool 14 from a state fixed to the clamping unit 12, only the single operating element 22 needs to be actuated.

[0036] By moving the control element 22 about the control element's axis of rotation 24, a movement of an actuating element 26 of the clamping unit 12 can be generated that is at least essentially parallel to the control element's axis of rotation 24 (see also Figure 3The operating element's rotary axis 24 runs at least substantially parallel to the output axis 56 of the output spindle and / or the rotation axis 52 of the connection interface 54 of the tool 14 in a state of the tool 14 fixed to the clamping unit 12. A movement of the operating element 22 for actuating the clamping unit 12 takes place in a plane which runs at least substantially perpendicular to the output axis 56 and / or the rotation axis 52 of the tool 14 in a state of the tool 14 fixed to the clamping unit 12.

[0037] The actuating element 26 is designed, for example, as a bolt, a pin, or another actuating element 26 that would appear suitable to a person skilled in the art. The clamping unit 12 has at least two states, in particular a release state and a fastening state. In the release state, the tool 14 can be removed from the clamping unit 12, in particular from a mounting position on the clamping unit 12, or arranged in the mounting position on the clamping unit 12. In the fastening state of the clamping unit 12, the tool 14 is fixed to the clamping unit 12 in a state arranged on the clamping unit 12, in particular in the mounting position. By moving the actuating element 26 of the clamping unit 12, the clamping unit 12 can be moved from the fastening state to the release state or vice versa.

[0038] In Figure 1The actuating unit 20, in particular the control element 22, is shown in two different positions. The representation of the control element 22 with solid lines corresponds to the clamping unit 12 being in its fixed position, with the control element 22 in an end position. The representation of the control element 22 with dashed lines corresponds to the unclamping unit 12 being in its unclamping position. It is also conceivable that the actuating unit 20 has a spring element that exerts a force on the control element 22 in the direction of its end position when the clamping unit 12 is in its fixed position.

[0039] The actuating unit 20 comprises a ramp-shaped actuating element 28. The actuating element 28 is designed to interact with the actuating element 26 of the clamping unit 12 to actuate the clamping unit 12. The actuating element 28 is designed to transmit the movement of the control element 22, in particular via the lever arm, to the actuating element 26 of the clamping unit 12. The actuating element 28 is arranged on the lever arm. The actuating element 28 is connected to the control element 22 via the lever arm. The lever arm is designed in two parts. Alternatively, however, it is also conceivable that the lever arm is designed in one part or is formed by more than two parts. The actuating element 28 is fastened to the lever arm by means of screws 66.Alternatively, it is also conceivable that the actuating means 28 is attached to the lever arm by means of a snap-fit ​​connection, a rivet connection or the like, in particular in a rotationally fixed manner, or that the actuating means 28 is at least partially formed integrally with the lever arm. In particular, the actuating means 28 and the operating element 22 are arranged at opposite ends of the lever arm.

[0040] The actuating element 28 at least partially surrounds the control element's axis of rotation 24. The actuating element 28 surrounds the control element's axis of rotation 24 within an angular range of no more than 75°. The angular range within which the actuating element 28 surrounds the control element's axis of rotation 24 is at least 20°.

[0041] The clamping unit 12 can be released by an actuation path 30 of the operating element 22 along the protective hood 16 of at least 40°. The clamping unit 12 can be released by an actuation path 30 of the operating element 22, starting from the end position of the operating element 22 in the clamping unit 12's fixed state, along the protective hood 16, in particular the upper part 38 of the protective hood, of at least 40°. Alternatively, however, it is also conceivable that the actuation unit 20 is designed such that the actuation path 30, in particular for releasing the clamping unit 12, starting from the end position of the operating element 22 in the clamping unit 12's fixed state, is less than 40°.An actuation path of the control element 22 starting from the end position of the control element 22 in the released state of the clamping unit 12 to generate the fastened state is in particular smaller than the actuation path 30 to generate the released state starting from the end position of the control element 22 in the fastened state of the clamping unit 12.

[0042] The actuation path 30 of the control element 22 along the protective hood 16 for actuating the clamping unit 12 is a maximum of 75°. The actuation path 30 of the control element 22 along the protective hood 16, in particular the upper part 38 of the protective hood, for releasing the clamping unit 12 is a maximum of 75°, in particular about the control element's axis of rotation 24, preferably starting from the end position of the control element 22 in the clamped state of the clamping unit 12. Alternatively, it is also conceivable that the actuation path 30 of the control element 22 along the protective hood 16 for actuating the clamping unit 12, in particular for releasing the clamping unit 12 from the clamped state, is more than 75°, in particular about the control element's axis of rotation 24, for example a maximum of 90°, preferably a maximum of 135°, and particularly preferably a maximum of 180°.

[0043] The actuation path 30 has a free travel of at least 20°. This free travel extends from the end position of the operating element 22 in the clamping unit 12's fixed position. The actuating unit 20, in particular the actuating means 28, exerts an actuating effect, in particular an actuating force, on the clamping unit 12, in particular the actuating element 26 of the clamping unit 12, only when the operating element 22 is located outside this free travel. When the operating element 22 is located within this free travel, the clamping unit 12, in particular the actuating element 26, is free from any actuating effect, in particular an actuating force, by the actuating unit 20, in particular the actuating means 28 of the actuating unit 20.The actuating means 28, in particular a force transmission surface 74 of the actuating means 28, exerts a force on the actuating element 26 of the clamping unit 12 in a state of the operating element 22 arranged outside the free travel.

[0044] The control element 22 is arranged on a side of the protective hood 16 facing away from the tool holding area 18 when viewed in a radial direction.

[0045] The radial direction refers in particular to the operating element's axis of rotation 24. The operating element 22 is arranged on the side of the protective hood 16 facing away from the operating side 36 when the clamping unit 12 is mounted. At least during normal operation of the machine tool 44, an operator is located on the operating side 36. A main handle 68 of the machine tool 44, in particular of the machine tool attachment 10, is located on the operating side 36.

[0046] The machine tool device 10 comprises at least one safety unit 34 which blocks the actuating unit 20 when the protective hood 16 is at least partially open (see figure). Figures 4 to 7 The locking unit 34 is mechanically designed. The actuating unit 20 is blocked or released by the locking unit 34, in particular automatically, depending on the position of the protective hood 16, in particular of a lower part 40 of the protective hood, relative to the upper part 38. The lower part 40 of the protective hood is rotatably arranged relative to the upper part 38 about a protective hood pivot axis 42.

[0047] The upper part of the protective hood 38 is rigidly connected, in particular rotationally fixed, to a housing element of the machine tool 44. The upper part of the protective hood 38 has a ramp 32 along which the operating element 22 for actuating the clamping unit 12 can be moved. The ramp 32 is mounted on a base body 76 of the upper part of the protective hood 38. It is conceivable that the ramp 32 is formed separately from the base body 76 and is attached to the base body 76, for example by means of a screw connection, a snap-fit ​​connection or the like, or that the ramp 32 is formed integrally with the base body 76. Alternatively, however, it is also conceivable that the upper part of the protective hood 38 is formed without a ramp 32. The upper part 38 of the protective hood and the lower part 40 of the protective hood at least partially surround the tool holding area 18. The ramp 32 has a contact surface 62 for resting the palm of the operator when operating the control element 22.The operating element 22 has a gripping surface 64 for the operator's fingers when operating the operating element 22. To release the clamping unit 12, the operating element 22 is movable from the end position in the clamping unit 12's fixed state, particularly in the direction of the operating side 36, preferably to the end position of the operating element 22 in the clamping unit 12's released state.

[0048] The lower part 40 of the protective hood is pivotable relative to the upper part 38 of the protective hood between the at least partially open state and the closed state of the protective hood 16. The locking unit 34 can be actuated depending on the position of the protective hood, preferably automatically. The locking unit 34 enables actuation of the actuating unit 20 when the protective hood 16, and in particular the lower part 40 of the protective hood, is closed, preferably automatically. The position of the protective hood indicates, in particular, whether the protective hood 16, and especially the lower part 40 of the protective hood, is at least partially open or closed.

[0049] Alternatively, it is also conceivable that the safety unit 34 is at least partially electrically designed. For example, it is also conceivable that the safety unit 34 has a detection unit for detecting the position of the protective cover. The detection unit can, for example, comprise a mechanical sensor, an optical sensor, or another sensor that would appear suitable to a person skilled in the art for detecting the position of the protective cover. It is conceivable that the safety unit 34 includes a control unit, which is configured, in particular, to evaluate a signal from the detection unit and, depending on this, to block or release the actuating unit 20. The control unit includes, in particular, at least a processor and a memory element, as well as an operating program stored on the memory element. The memory element is preferably designed as a digital storage medium, for example, a hard drive or the like.It is also conceivable that the control unit of the safety unit 34 is at least partially formed by a control unit of the machine tool 44.

[0050] The locking unit 34 comprises a locking element 48. Closing the protective cover 16 moves the locking element 48 into an unlocked position. The locking element 48 is designed as a pin. Alternatively, it is also conceivable that the locking element 48 is designed as a hook, as a ramp-shaped element, or as another locking element 48 that would appear useful to a person skilled in the art. The actuating unit 20 can be actuated in the unlocked position of the locking element 48. Figures 4 and 5The locking element 48 is in the unlocked position, with the lower part of the protective hood 40 being closed and pressing against a stop pin 70 of the locking unit 34. In the unlocked state, the locking element 48 is in the unlocked position. The operating element 22 is movable along the protective hood 16, particularly along the upper part 38, when the locking element 48 is unlocked. The actuating unit 20, particularly the operating element 22, is free from any engagement, particularly any force, by the locking unit 34, particularly the locking element 48, when the locking element 48 is unlocked. The locking unit 34 can be actuated by moving at least a part of the protective hood 16, particularly the lower part 40, relative to the locking unit 34, preferably the locking element 48. The locking element 48 can be moved by moving the lower part 40 of the protective hood.The locking element 48 can be moved from the unlocked state to a locked state and / or from the locked state to the unlocked state by a movement of at least part of the protective hood 16, in particular by a movement of the lower part of the protective hood 40 relative to the locking unit 34, preferably the locking element 48. In the locked state, the locking element 48 is in a locked position. Figure 6 and 7The locking element 48 is in the locked position, wherein the lower part of the protective hood 40 is at least partially open and the stop pin 70 of the locking unit 34 is free from any force exerted by the lower part of the protective hood 40. The locking element 48 can only be moved into the unlocked position when the protective hood 16 is closed. Preferably, the locking unit 34 is designed such that the locking element 48 automatically moves into the locked position when the protective hood 16 is open, for example by means of a gravity-controlled mechanism, a spring element, or the like.

[0051] The locking element 48 is designed as a pin. When the protective cover 16 is at least partially open, the locking element 48 engages the actuating unit 20. When the protective cover 16 is at least partially open, the locking element 48 acts on the lever arm of the actuating unit 20. The lever arm has a recess 72 in which the locking element 48 is arranged in the locked position. When the protective cover 16 is at least partially open, the locking element 48 blocks the movement of the operating element 22 along the protective cover 16, in particular the upper part 38 of the protective cover. In the locked position, the locking element 48 blocks movement, in particular rotation, of the lever arm, especially about the operating element's axis of rotation 24.

[0052] By rotating the locking element 48 about a locking element rotation axis 50, the locking element 48 can be moved into the unlocked position or into the locked position. The locking unit 34, in particular the locking element 48, is rotatably mounted on the protective hood 16, in particular the upper part 38 of the protective hood. Alternatively, however, it is also conceivable that the locking unit 34, in particular at least the locking element 48, is rotatably mounted on a housing element of the machine tool 44.

[0053] The rotation of the locking element 48 can be generated by a movement of at least part of the protective cover 16. When the protective cover 16 is closed, the lower part 40 of the protective cover moves the locking element 48 into the unlocked position. The protective cover 16, and in particular the lower part 40, is arranged relative to the locking element 48 such that when the protective cover 16 is closed, the lower part 40 abuts the locking unit 34, in particular the stop pin 70, and moves the locking element 48 into the unlocked position. The stop pin 70 is fixedly connected to the locking element 48, in particular non-rotatably. In particular, the stop pin 70 is formed integrally with the locking element 48.Alternatively, it is also conceivable that the safety unit 34, in particular at least the locking element 48, is mechanically, in particular functionally, preferably directly, connected to the protective hood 16, in particular the lower part of the protective hood 40, regardless of the position of the protective hood.

[0054] The protective hood's pivot axis 42 is spaced apart from and arranged at least substantially parallel to the locking element's pivot axis 50 and / or the operating element's pivot axis 24. Alternatively, it is also conceivable that the protective hood's pivot axis 42 corresponds to the operating element's pivot axis 24. The locking element's pivot axis 50 is spaced apart from and arranged at least substantially parallel to the operating element's pivot axis 24.

[0055] The protective hood 16 at least partially surrounds the locking unit 34. The locking unit 34, in particular at least the locking element 48, is arranged on a side of the protective hood 16 facing the tool holding area 18. The locking unit 34, in particular at least the locking element 48, is arranged between the upper part 38 of the protective hood and the lower part 40 of the protective hood.

Claims

1. Machine tool device (10), in particular hand-held circular saw device, with a clamping unit (12) for fixing a tool (14), in particular a circular saw blade, with a protective cover (16) which surrounds a tool receiving area (18) for the tool (14) at least partially, and with an activation unit (20) for activating the clamping unit (12), characterized by a locking unit (34) which blocks the activation unit (20) when the protective cover (16) is at least partially opened.

2. Machine tool device (10) according to Claim 1, characterized in that the locking unit (34) comprises a blocking element (48), wherein closing the protective cover (16) moves the blocking element (48) to an unblocking position.

3. Machine tool device (10) according to Claim 1 or 2, characterized in that the locking unit (34) comprises a blocking element (48) formed as a pin, which engages with the protective cover (16) open in the activation unit (20).

4. Machine tool device (10) according to one of the preceding claims, characterized in that the locking unit (34) comprises a blocking element (48), which is movable to an unblocking position or to a blocking position by rotation about a blocking element rotation axis (50).

5. Machine tool device (10) according to Claim 4, characterized in that the rotation of the blocking element (48) is able to be generated by moving at least part of the protective cover (16).

6. Machine tool device (10) according to any one of the preceding claims, characterized in that the protective cover (16) has at least one protective cover upper part (38) and one protective cover lower part (40) which is disposed so as to be rotatable about a protective cover rotation axis (42) relative to the protective cover upper part (38).

7. Machine tool device (10) according to Claims 4 and 6, characterized in that the protective cover rotation axis (42) is disposed so as to be spaced apart from and parallel to the blocking element rotation axis (50).

8. Machine tool device (10) according to one of the preceding claims, characterized in that the activation unit (20) has an operating element (22) which for activation is movable at least partially along the protective cover (16).

9. Machine tool device (10) according to Claim 8, characterized in that the operating element (22) is movable about an operating element rotation axis (24), wherein a movement of an activation element (26) of the clamping unit (12) parallel to the operating element rotation axis (24) is able to be generated by moving the operating element (22) about the operating element rotation axis (24)10. Machine tool device (10) according to at least Claims 6 and 9, characterized in that the protective cover rotation axis (42) is disposed so as to be spaced apart from and parallel to the operating element rotation axis (24).

11. Machine tool device (10) according to at least Claims 4 and 9, characterized in that the blocking element rotation axis (50) is disposed so as to be spaced apart from and parallel to the operating element rotation axis (24).

12. Machine tool device (10) according to one of the preceding claims, characterized in that the protective cover (16) surrounds the locking unit (34) at least partially.

13. Machine tool (44), in particular a hand-held circular saw, having a machine tool device (10) according to one of the preceding claims.

14. System (46) with a tool (14), in particular a circular saw blade, and with a machine tool (44) according to Claim 13.