Machine tool device, machine tool and system

Abstract

The invention relates to a machine tool device (10), in particular circular saw device, comprising: a clamping unit (12) for fixing a tool (14), in particular a circular saw blade; a protective cover (16), which at least partly surrounds a tool holder region (18) for the tool (14); and an actuation unit (20) for actuating the clamping unit (12). According to the invention, the actuation unit (20) has an operating element (22) which can be moved at least to some degree along the protective cover (16) for actuation.

Description

[0001] Description

[0002] Machine tool fixture, machine tool and system

[0003] State of the art

[0004] A machine tool device has already been proposed with a clamping unit for fixing a tool, with a protective hood which at least partially surrounds a tool receiving area for the tool, and with an actuating unit for actuating the clamping unit.

[0005] Disclosure of the invention

[0006] The invention relates to a machine tool device, in particular a hand-held circular saw device, comprising a clamping unit for fixing a tool, in particular a circular saw blade, comprising a protective hood which at least partially surrounds a tool receiving area for the tool, and comprising an actuating unit for actuating the clamping unit.

[0007] It is proposed that the actuating unit have an operating element which can be moved at least partially along the protective hood for actuation. The inventive design of the machine tool device advantageously makes it particularly easy and quick to release a tool from a state fixed to the clamping unit. Advantageously, a tool can be changed particularly conveniently and in a time-saving manner. Advantageously, a particularly fast workflow can be ensured. Advantageously, a particularly space-saving and at the same time safe actuation of the operating element can be achieved. Advantageously, an actuating unit, in particular an operating element, can be provided which can be operated in a particularly compact manner. Thus, damage to the actuating unit, in particular to the operating element, can be counteracted in a particularly simple and effective manner.This advantageously allows for particularly ergonomic operation of the operating unit, in particular of the control element. This advantageously prevents injury to an operator when operating the operating unit.

[0008] The operating element is particularly intended for manual actuation by a user. Preferably, the operating element can be moved along the protective hood by rotating it about an operating element rotation axis. Preferably, the operating element can be moved at least substantially parallel to a surface, in particular an outer surface, of the protective hood for actuation. “Substantially parallel” is to be understood here as meaning in particular an alignment of a direction relative to a reference direction, in particular in a plane, wherein the direction has a deviation from the reference direction of in particular 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 in particular the operating element can be moved about the operating element rotation axis. 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 for the operating element, in particular the lever arm, to be mounted on a housing element of the machine tool, which is in particular different from the protective hood or the like and is movable, preferably rotatable. 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, however, it is also conceivable for the operating element to rest on the protective hood and to be guided during a movement along the protective hood, preferably by the protective hood, in particular the surface of the protective hood facing the operating element. Preferably, only one operating element needs to be actuated to release the tool from a state fixed to the clamping unit.

[0009] The clamping unit can be operated, in particular, without tools, preferably by means of the actuating unit. The clamping unit is preferably arranged fixedly, in particular in a rotationally fixed manner, on a machine tool, in particular on an output spindle of an output unit of the machine tool. Alternatively, it is conceivable for the clamping unit to be arranged detachably on the machine tool, in particular on the output spindle. The clamping unit is preferably provided for fastening the tool to the machine tool device, in particular without tools. “Provided” should be understood to mean specially configured, specially designed and / or specially equipped. The fact that an object is provided for a specific function should be understood to mean that the object fulfills and / or executes this specific function in at least one application and / or operating state.Preferably, the tool, particularly when fixed to the clamping unit, can be driven in a rotating or oscillating manner, particularly 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, particularly viewed in a plane extending at least substantially perpendicular to an output axis of the output spindle, an outer contour that is configured to correspond to a contour of the connection interface.“Substantially perpendicular” can be understood as an alignment of a direction relative to a reference direction, wherein the direction and the reference direction, in particular 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 particularly advantageously less than 2°. The contour of the connection interface results in particular from a course of an inner boundary contour and an outer boundary contour of the connection interface. The output axis preferably runs at least substantially parallel to the axis of rotation of the connection interface when the tool is fixed to the clamping unit.

[0010] The output unit is preferably provided 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. The output unit is preferably operatively connected to a drive unit of the machine tool in a manner already known to a person 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, in particular a hollow spindle, which forms the output spindle. The rotational and / or oscillatory movement of the output unit can preferably be generated as a result of the interaction of the output unit with the drive unit of the machine tool, which comprises at least one electric motor.

[0011] In a further aspect of the invention, which can be considered in particular on its own as well as in conjunction with other aspects of the invention, it is proposed that the machine tool device comprise at least one safety unit which blocks the actuating unit when the protective hood is at least partially opened. Advantageously, a machine tool device with particularly high operating safety can be provided. Advantageously, unintentional actuation of the actuating unit to release the tool from the clamping unit can be counteracted. Advantageously, falling of the tool when releasing the clamping unit can be counteracted. Advantageously, a particularly low risk of injury for a user can be achieved. Advantageously, the tool can be changed quickly and easily while at the same time maintaining particularly high user safety.The safety unit is preferably mechanically designed. The actuating unit is preferably blocked or released by the safety unit, in particular automatically, depending on a protective hood position of the protective hood. The safety unit can preferably be actuated, in particular automatically, depending on the protective hood position. In particular, the safety unit enables actuation of the actuating unit when the protective hood is closed, preferably automatically. The protective hood position indicates in particular whether the protective hood is at least partially open or closed. Alternatively, it is also conceivable for the safety unit to be at least partially electrically designed. For example, it is conceivable for the safety unit to have a detection unit for detecting a protective hood position.The detection unit can, for example, comprise a mechanical sensor, an optical sensor, or another sensor deemed appropriate by a person skilled in the art for detecting the protective hood position. It is conceivable for the safety unit to comprise a control unit which is configured, in particular, to evaluate a signal from the detection unit and, depending thereon, to block or release the actuating unit. The control unit comprises, in particular, at least one processor and one 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, as a hard disk or the like. It is also conceivable for the control unit of the safety unit to be formed by a control unit of the machine tool.

[0012] 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 runs at least substantially parallel to the operating element rotation axis. The operating element rotation axis runs in particular at least substantially parallel to the output axis of the output spindle and / or the rotation axis of the connection interface of the tool when the tool is fixed to the clamping unit. A movement of the operating element for actuating the clamping unit preferably runs in a plane that runs 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, as a pin, or as another actuating element that appears appropriate to a person skilled in the art. The clamping unit preferably has at least two states, in particular a released state and a fastened state. In the released state, the tool can preferably be removed from the clamping unit, in particular from a mounted position on the clamping unit, or can be arranged on the clamping unit in the mounted position. In the mounted state, the tool is fixed to the clamping unit in a state arranged on the clamping unit, in particular in the mounted position. By moving the actuating element of the clamping unit, the clamping unit can be transferred, in particular, from the mounted state to the released state or from the released state to the fastened state. A particularly ergonomic arrangement of the actuating unit can advantageously be realized.A particularly high level of operating comfort can advantageously be achieved. Furthermore, it is proposed that the actuating unit have a ramp-shaped actuating means. The actuating means is intended in particular to interact with the actuating element of the clamping unit for actuating the clamping unit. Preferably, the actuating means is intended to transmit the movement of the operating element, in particular via the lever arm, to the actuating element of the clamping unit. Preferably, the actuating means is arranged on the lever arm. The actuating means is preferably connected to the operating element via the lever arm. Preferably, the actuating means is fastened to the lever arm, in particular in a rotationally fixed manner, for example by means of a screw connection, a snap-in connection or the like. It is conceivable for the lever arm to be designed in one piece or in multiple parts.Alternatively, it is conceivable that the actuating means is at least partially formed 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 with one another" 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.“Integral” can be understood 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, such as by production from a single casting and / or by production using a single-component 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-in connection or the like. Alternatively, it is also conceivable for the operating element to be at least partially formed in one piece with the lever arm. In particular, the actuating means and the operating element are arranged at opposite ends of the lever arm.Advantageously, a movement of the operating element along the protective hood can be transferred into a movement for actuating the clamping unit in a particularly simple design. Advantageously, a particularly uniform release of the clamping unit can be achieved. Furthermore, it is proposed that the actuating unit comprise an actuating means, in particular the one already mentioned, which at least partially surrounds the operating element rotation axis. Preferably, the actuating means surrounds the operating element rotation axis within an angular range of maximum 75°. Preferably, the angular range within which the actuating means surrounds the operating element rotation axis is at least 20°. Advantageously, a particularly comfortable and uniform actuation of the clamping unit can be achieved.

[0013] It is further proposed that the clamping unit be releasable by an actuation path of the operating element along the protective hood of at least 40°, in particular around the operating element's rotation axis. Preferably, the clamping unit is releasable by an actuation path of the operating element, starting from an end position of the operating element in the fastening state of the clamping unit along the protective hood, of at least 40°. Alternatively, however, it is also conceivable for the actuation unit to be designed such that the actuation path, in particular for releasing the clamping unit, preferably starting from the end position of the operating element in the fastening state of the clamping unit, is less than 40°.Preferably, an actuation path of the operating element, starting from an end position of the operating element in the release state of the clamping unit, for generating the fastening state is smaller than the actuation path for generating the release state starting from the end position of the operating element in the fastening state of the clamping unit. Advantageously, the clamping unit can be released particularly easily and quickly, while at the same time, in particular, unintentional release of the clamping unit can be counteracted. Advantageously, a tool change can be carried out particularly quickly and conveniently. Advantageously, a particularly high level of operating comfort can be achieved when releasing the clamping unit.

[0014] It is also proposed that an actuation path of the operating element along the protective hood for actuating the clamping unit, in particular the one already mentioned above, amounts to a maximum of 75°, in particular around the operating element's axis of rotation. Preferably, the actuation path of the operating element along the protective hood for releasing the clamping unit amounts to a maximum of 75°, in particular around the operating element's axis of rotation, preferably starting from the end position of the operating element in the fastened state of the clamping unit. In an alternative embodiment of the actuation unit, it is also conceivable that the actuation path of the operating element along the protective hood for actuating the clamping unit, in particular for releasing the clamping unit from the fastened state, amounts to more than 75°, in particular around the operating element's axis of rotation, for example a maximum of 90°, preferably a maximum of 135°, particularly preferably a maximum of 180°. Advantageously, the clamping unit can be released particularly conveniently and quickly.Advantageously, the space required for actuating, especially releasing, the clamping unit can be kept particularly small. Advantageously, a particularly compact actuating unit can be provided.

[0015] It is further proposed that the actuating path has a free travel of at least 20°, in particular around the operating element rotation axis. In particular, the free travel runs from the end position of the operating element in the fastening state of the clamping unit. In particular, the actuating unit, preferably the actuating means, only exerts an actuating effect, in particular an actuating force, on the clamping unit, in particular the actuating element of the clamping unit, when the operating element is arranged outside the free travel. The clamping unit, in particular the actuating element, is preferably free from an actuating effect, in particular an actuating force, by the actuating unit, in particular the actuating means of the actuating unit, when the operating element is arranged 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 arranged within the free travel. Alternatively, however, it is also conceivable that the actuating means of the actuating unit rests against the actuating element of the clamping unit when the operating element is arranged within the free travel. Preferably, the actuating means, in particular a force transmission surface of the actuating element, rests against the actuating element of the clamping unit at least when the operating element is arranged outside the 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 arranged outside the free travel.The advantage is that the actuating unit can be designed to simply and effectively counteract any unintentional release of the clamping unit. This can result in a particularly high level of occupational safety.

[0016] Furthermore, it is proposed that the operating element be arranged on a side of the protective hood facing away from the tool-holding area, viewed in the radial direction. The radial direction refers in particular to the operating element's rotation axis. Advantageously, an actuating unit with an arrangement of the operating element that is particularly favorable with regard to operating safety can be provided. Advantageously, the operator can be prevented from reaching into the tool-holding area, in particular into the tool. Advantageously, the risk of injury when operating the operating element can be kept particularly low. Advantageously, particularly comfortable operation of the operating element can be achieved.

[0017] Furthermore, it is proposed that the operating element be arranged on a side of the protective hood facing away from an operating side in a fastening state of the clamping unit, in particular the previously mentioned state. Preferably, an operator is located on the operating side at least in one operating state. A main handle of the machine tool, in particular of the machine tool device, or the like is preferably arranged on the operating side. Advantageously, the arrangement of the operating element according to the invention makes it particularly easy and effective to counteract unintentional actuation, in particular release, of the clamping unit, at least in one operating state.

[0018] It is further proposed that the safety unit comprise a locking element, wherein closing the protective hood moves the locking element into an unlocked position. The locking element is designed, for example, as a pin, a hook, a ramp-shaped element, or as another locking element that appears appropriate 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 can be moved along the protective hood in the unlocked position of the locking element. In particular, the actuating unit, preferably the operating element, is free from intervention, in particular from the application of force, by the safety unit, preferably the locking element, in the unlocked position of the locking element. Preferably, the safety unit can be actuated by moving at least part of the protective hood. In particular, the locking element can be moved by moving at least part of the protective hood.The locking element can preferably 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 hood. In the unlocked state, the locking element is in particular in the unlocked position. In the locked state, the locking element is in particular in a locked position. The locking element can preferably only be moved into the unlocked state when the protective hood is closed. The safety unit is preferably designed such that the locking element automatically moves into the locked state when the protective hood is open, for example by means of a gravity-controlled mechanism, a spring element or the like. Closing the protective hood can advantageously be used to unlock the safety unit. The actuating unit can advantageously be actuated automatically by closing the protective hood.Advantageously, a particularly high level of operating comfort can be achieved.

[0019] It is also proposed that the securing unit comprise a locking element designed as a pin, in particular the one already mentioned, which engages in the actuating unit when the protective hood is at least partially open. Preferably, the locking element acts on the lever arm of the actuating unit when the protective hood 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 state. In particular, when the protective hood is at least partially open, the locking element blocks the movement of the operating element along the protective hood. Preferably, in the locked state, the locking element blocks a movement, in particular a rotation, of the lever arm, in particular about the operating element rotation axis.Advantageously, actuation of the clamping unit by means of the actuating unit can be counteracted particularly effectively and with a simple design, and thus also preventing the tool from falling out when the protective hood is at least partially open. Furthermore, it is proposed that the securing 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 securing 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 securing unit can be provided.

[0020] Furthermore, it is proposed that the rotation of the locking element can be generated by a movement of at least part of the protective hood. Preferably, the protective hood, in particular at least one part of the protective hood, is arranged relative to the locking element such that the at least one part strikes the securing unit when the protective hood is closed and moves the locking element into the unlocked position. Alternatively, it is also conceivable that the securing unit, in particular at least the locking element, is mechanically connected, in particular functionally, preferably directly, to the protective hood, in particular to at least one part of the protective hood, regardless of the protective hood position. Advantageously, a particularly simple and convenient operation of the securing unit can be achieved, which is advantageous in terms of operating safety.

[0021] It is further proposed that the protective hood comprise at least one protective hood upper part and one protective hood lower part, which is arranged so as to be rotatable relative to the protective hood upper part about a protective hood rotation axis. The protective hood upper part is preferably fixedly, in particular rotationally fixedly, connected 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 protective hood upper part to actuate the clamping unit. It is conceivable for the protective hood upper part to comprise a ramp or the like, along which the operating element is movable to actuate the clamping unit. The ramp is in particular mounted on a base body of the protective hood upper part.It is conceivable for the ramp to be formed separately from the base body and fastened to the base body, for example by means of a screw connection, a snap-in connection or the like, or for the ramp to be formed integrally with the base body. Alternatively, however, it is also conceivable for the protective hood upper part to be formed free of a ramp. The protective hood upper part and the protective hood lower part at least partially surround the tool receiving area. The protective hood lower part can be pivoted relative to the protective hood upper part, in particular between the open state of the protective hood and the closed state of the protective hood. The securing unit can preferably be actuated by an interaction, in particular a movement, of the protective hood lower part. When the protective hood is closed, the protective hood lower part preferably moves the locking element into the unlocked state.Advantageously, the safety unit can be activated by a relative movement of the lower part of the protective hood to the upper part of the protective hood, particularly automatically. This allows for particularly high operating comfort.

[0022] It is also proposed that the protective hood rotation axis be spaced apart from, and at least substantially parallel to, the control element rotation axis. Alternatively, it is also conceivable that the protective hood rotation axis correspond to the control element rotation axis. Advantageously, the space requirements of the actuating unit and the protective hood can be kept particularly compact.

[0023] It is also proposed that the protective hood rotation axis be arranged at a distance from, and at least substantially parallel to, the locking element rotation axis. This advantageously allows for a particularly favorable force chain between the protective hood and the safety unit for actuating the safety unit. Advantageously, the safety unit can be actuated with particularly little force.

[0024] It is also proposed that the locking element rotation axis be arranged at a distance from and at least substantially parallel to the operating element rotation axis. Advantageously, the space required for the actuating unit and the securing unit can be kept particularly compact. Advantageously, a particularly favorable force effect chain can be achieved between the securing unit and the actuating unit for locking and / or unlocking the actuating unit. Furthermore, it is proposed that the protective hood at least partially surrounds the securing unit. Preferably, the securing unit, in particular at least the locking element, is arranged on a side of the protective hood facing the tool receiving area. Preferably, the securing unit, in particular at least the locking element, is arranged between the protective hood upper part and the protective hood lower part. Advantageously, the securing unit can be protected from damage, in particular from direct impacts.The arrangement of the security unit according to the invention makes it particularly easy and effective to counteract unintentional unlocking of the security unit.

[0025] Furthermore, a machine tool, in particular a hand-held 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 hand-held machine tool. 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 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. The machine tool is preferably designed as a hand-held circular saw. However, it is also conceivable for the machine tool to have another design which would appear expedient to a person skilled in the art, such as, for example, a design as an angle grinder, a table saw, an oscillating machine tool, a grinding machine or the like.The inventive design advantageously provides a machine tool that enables particularly rapid removal and changing of tools on the machine tool. Advantageously, a particularly efficient workflow can be realized.

[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 for the tool to be designed as a grinding wheel, a cutting wheel, a polishing wheel, or another tool deemed appropriate by a person skilled in the art. Advantageously, a system can be provided that enables 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 realized.

[0027] The machine tool device according to the invention, the machine tool according to the invention, and / or the system according to the invention are not intended to be limited to the application and embodiment described above. In particular, the machine tool device according to the invention, the machine tool according to the invention, and / or the system according to the invention can have a number of individual elements, components, and units that differs from the number stated herein to fulfill a functionality described herein. Furthermore, in the value ranges specified in this disclosure, values ​​within the stated limits are also to be considered disclosed and can be used arbitrarily.

[0028] drawing

[0029] 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.

[0030] They show:

[0031] Fig. 1 is 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,

[0032] Fig. 2 is a perspective exploded view of a machine tool device according to the invention of the machine tool according to the invention, Fig. 3 is a perspective sectional view through the machine tool from Figure 1

[0033] Fig. 4 is a schematic front view of a part of the machine tool according to the invention without the tool in an unlocked state of a safety unit of the machine tool device according to the invention,

[0034] Fig. 5 is 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 safety unit,

[0035] Fig. 6 is a schematic front view of the part of the machine tool according to the invention without the tool in a locked state of the safety unit and

[0036] Fig. 7 is 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 safety unit.

[0037] Description of the embodiment

[0038] Figure 1 shows a system 46 with a tool 14 and with a machine tool 44. The machine tool 44 is designed as a portable machine tool, in particular as a hand-held power tool. The machine tool 44 is designed as a hand-held circular saw. However, it is also conceivable for the machine tool 44 to have another design that would appear appropriate 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 for the tool 14 to be designed as a grinding wheel, a cutting wheel, a polishing wheel, or another tool 14 that would appear appropriate to a person skilled in the art.

[0039] The machine tool 44 comprises a machine tool device 10. The machine tool device 10 comprises a clamping unit 12 for fixing the tool 14. The clamping unit 12 can be operated without tools. The machine tool device 10 comprises an actuating unit 20 for actuating the clamping unit 12, in particular without tools. The clamping unit 12 is fixedly, in particular non-rotatably, arranged on the machine tool 44, in particular on an output spindle of an output unit of the machine tool 44. Alternatively, it is conceivable for the clamping unit 12 to be detachably arranged on the machine tool 44, in particular on the output spindle. The clamping unit 12 is provided for fastening the tool 14 to the machine tool device 10, in particular without tools.The tool 14 can be driven in a rotating or oscillating manner when fixed to the clamping unit 12, in particular about a rotational axis 52 of a connection interface 54 of the tool 14. When fixed to the machine tool 44 by means of the clamping unit 12, the tool 14 can be driven, preferably in a rotating or oscillating manner, by the output spindle. The clamping unit 12 has, in particular viewed in a plane extending at least substantially perpendicular to an output axis 56 of the output spindle, an outer contour that is configured to correspond to a contour of the connection interface 54. The contour of the connection interface 54 results from the profile of an inner boundary contour and an outer boundary contour of the connection interface 54.When the tool 14 is fixed to the clamping unit 12, the output axis 56 runs at least substantially parallel to the rotational 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 rotational axis 52 of the connection interface 54.

[0040] The clamping unit 12 is designed here as a quick-action clamping device, as disclosed, for example, in WO 2021 / 130026 A1, but with six retaining wings designed to correspond to the connection interface 54 (see also Figure 2). The disclosure content of WO 2021 / 130026 A1 with regard to the quick-action clamping device disclosed therein should be regarded in particular as part of the present description with regard to the design of the clamping unit 12. Alternatively, however, it is also conceivable that the clamping unit 12 is designed with four retaining wings in accordance with the quick-action clamping device from WO 2021 / 130026 A1, is designed as a quick-action clamping device, as disclosed, for example, in DE 10 2017 213 669 A1, or is designed as another quick-action clamping device that appears appropriate to a person skilled in the art.The output unit is provided 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 already known to a person 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, in particular a hollow spindle, which forms the output spindle. The rotational and / or oscillatory movement of the output unit can preferably be generated as a result of the interaction of the output unit with the drive unit of the machine tool 44, which comprises at least one electric motor.

[0041] The machine tool device 10 comprises a protective hood 16, which at least partially surrounds a tool receiving area 18 for the tool 14. The actuating unit 20 has an operating element 22, which can be moved at least partially along the protective hood 16 for actuation. The operating element 22 is intended for manual actuation by a user. The operating element 22 can be moved 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 can be moved at least substantially parallel to a surface 58, in particular the outer surface, of the protective hood 16 for actuation.

[0042] The actuating unit 20 comprises at least one lever arm 60. By means of the lever arm 60, the operating element 22 is movable about the operating element rotation axis 24. The operating element 22 is rotatably mounted on a part of the protective hood 16, in particular on a protective hood upper part 38 of the protective hood 16, in particular by means of the lever arm 60. The operating element 22 is movable along the protective hood upper part 38 to actuate the clamping unit 12. Alternatively, it is also conceivable for the operating element 22, in particular the lever arm 60, to be 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 the protective hood upper part 38.For actuation, the operating element 22 is movable at a constant distance from the protective hood 16, in particular the protective hood upper part 38, at least partially along the protective hood 16, in particular the protective hood upper part 38. Alternatively, however, it is also conceivable for the operating element 22 to rest against the protective hood 16, in particular through the protective hood 16, preferably the surface 58 of the protective hood 16 facing the operating element 22, to be guided during a movement along the protective hood 16, in particular the protective hood upper part 38. To release the tool 14 from a state fixed to the clamping unit 12, only one operating element 22 needs to be actuated.

[0043] By moving the operating element 22 about the operating element rotation axis 24, a movement of an actuating element 26 of the clamping unit 12 can be generated that runs at least substantially parallel to the operating element rotation axis 24 (see also Figure 3). The operating element rotation 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 when the tool 14 is fixed to the clamping unit 12. A movement of the operating element 22 for actuating the clamping unit 12 runs in a plane that runs at least substantially perpendicular to the output axis 56 and / or the rotation axis 52 of the tool 14 when the tool 14 is fixed to the clamping unit 12.

[0044] The actuating element 26 is designed, for example, as a bolt, as a pin, or as another actuating element 26 that would appear appropriate to a person skilled in the art. The clamping unit 12 has at least two states, in particular a released state and a fastened state. In the released state, the tool 14 can be removed from the clamping unit 12, in particular from a mounted position on the clamping unit 12, or can be arranged in the mounted position on the clamping unit 12. In the mounted 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 mounted position. By moving the actuating element 26 of the clamping unit 12, the clamping unit 12 can be transferred from the mounted state to the released state or from the released state to the fastened state.In Figure 1, the actuating unit 20, in particular the operating element 22, is shown in two different positions. The representation of the operating element 22 with solid lines corresponds to the fastening state of the clamping unit 12, wherein the operating element 22 is in an end position of the operating element 22 in the fastening state of the clamping unit 12. The dashed representation of the operating element 22 corresponds to the release state of the clamping unit 12, wherein the operating element 22 is in an end position of the operating element 22 in the release state of the clamping unit 12. It is also conceivable for the actuating unit 20 to have a spring element which applies a force to the operating element 22 in the direction of the end position of the operating element 22 in the fastening state of the clamping unit 12.

[0045] The actuating unit 20 comprises a ramp-shaped actuating means 28. The actuating means 28 is intended to interact with the actuating element 26 of the clamping unit 12 to actuate the clamping unit 12. The actuating means 28 is intended to transmit the movement of the operating element 22, in particular via the lever arm 60, to the actuating element 26 of the clamping unit 12. The actuating means 28 is arranged on the lever arm 60. The actuating means 28 is connected to the operating element 22 via the lever arm 60. The lever arm 60 is formed in two parts. Alternatively, however, it is also conceivable for the lever arm 60 to be formed in one piece or from more than two parts. The actuating means 28 is fastened to the lever arm 60 by means of screws 66.Alternatively, it is also conceivable that the actuating means 28 is fastened to the lever arm 60 by means of a snap-in connection, a riveted 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 60. In particular, the actuating means 28 and the operating element 22 are arranged at mutually opposite ends of the lever arm 60.

[0046] The actuating means 28 at least partially surrounds the operating element rotation axis 24. The actuating means 28 surrounds the operating element rotation axis 24 within an angular range of a maximum of 75°. The angular range in which the actuating means 28 surrounds the operating element rotation axis 24 is at least 20°. The clamping unit 12 can be released by an actuating 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 actuating path 30 of the operating element 22, starting from the end position of the operating element 22 in the fastened state of the clamping unit 12 along the protective hood 16, in particular the protective hood upper part 38, of at least 40°. Alternatively, however, it is also conceivable that the actuating unit 20 is designed such that the actuating path 30, in particular for releasing the clamping unit 12, starting from the end position of the operating element 22 in the fastening state of the clamping unit 12, is less than 40°.An actuation path of the operating element 22 starting from the end position of the operating element 22 in the release state of the clamping unit 12 for generating the fastening state is in particular smaller than the actuation path 30 for generating the release state starting from the end position of the operating element 22 in the fastening state of the clamping unit 12.

[0047] The actuation path 30 of the operating element 22 along the protective hood 16 for actuating the clamping unit 12 is a maximum of 75°. The actuation path 30 of the operating element 22 along the protective hood 16, in particular of the protective hood upper part 38, for releasing the clamping unit 12 is a maximum of 75°, in particular about the operating element rotation axis 24, preferably starting from the end position of the operating element 22 in the fastened state of the clamping unit 12. Alternatively, it is also conceivable that the actuation path 30 of the operating element 22 along the protective hood 16 for actuating the clamping unit 12, in particular for releasing the clamping unit 12 from the fastened state, is more than 75°, in particular about the operating element rotation axis 24, for example a maximum of 90°, preferably a maximum of 135°, particularly preferably a maximum of 180°.

[0048] The actuating path 30 has a free travel of at least 20°. The free travel extends from the end position of the operating element 22 in the fastened state of the clamping unit 12. The actuating unit 20, in particular the actuating means 28, only 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, when the operating element 22 is arranged outside the free travel. The clamping unit 12, in particular the actuating element 26, is free from an actuating effect, in particular an actuating force, by the actuating unit 20, in particular the actuating means 28 of the actuating unit 20, when the operating element 22 is arranged within the free travel.The actuating means 28, in particular a force transmission surface 74 of the actuating element 26, exerts a force on the actuating element 26 of the clamping unit 12 when the operating element 22 is arranged outside the free travel.

[0049] The operating element 22 is arranged, viewed in the radial direction, on a side of the protective hood 16 facing away from the tool receiving area 18. The radial direction refers in particular to the operating element rotation axis 24. When the clamping unit 12 is fastened, the operating element 22 is arranged on a side of the protective hood 16 facing away from an operating side 36. An operator is located on the operating side 36, at least during proper operation of the machine tool 44. A main handle 68 of the machine tool 44, in particular of the machine tool device 10, is arranged on the operating side 36.

[0050] 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 Figures 4 to 7). The safety unit 34 is mechanically designed. The actuating unit 20 is blocked or released by the safety unit 34, in particular automatically, depending on a protective hood position of the protective hood 16, in particular a protective hood lower part 40 relative to the protective hood upper part 38. The protective hood lower part 40 is arranged so as to be rotatable relative to the protective hood upper part 38 about a protective hood rotation axis 42.

[0051] The protective hood upper part 38 is fixedly, in particular rotationally fixedly, connected to a housing element of the machine tool 44. The protective hood upper part 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 protective hood upper part 38. It is conceivable that the ramp 32 is formed separately from the base body 76 and is fastened to the base body 76, for example by means of a screw connection, a snap-in connection, or the like, or that the ramp 32 is formed integrally with the base body 76. Alternatively, however, it is also conceivable for the protective hood upper part 38 to be formed free of a ramp 32. The protective hood upper part 38 and the protective hood lower part 40 at least partially surround the tool receiving area 18. The ramp 32 has a contact surface 62 for placing the ball of the operator's hand when operating the operating element 22.The operating element 22 has a gripping surface 64 for the operator's fingers to grip when operating the operating element 22. To release the clamping unit 12, the operating element 22 can be moved from the end position in the fastening state of the clamping unit 12, in particular in the direction of the operating side 36, preferably into the end position of the operating element 22 in the release state of the clamping unit 12.

[0052] The protective hood lower part 40 is pivotable relative to the protective hood upper part 38 between the at least partially open state of the protective hood 16 and the closed state of the protective hood 16. The safety unit 34 can be actuated, in particular automatically, depending on the protective hood position. The safety unit 34 enables actuation of the actuating unit 20 when the protective hood 16, in particular when the protective hood lower part 40, is closed, preferably automatically. The protective hood position indicates, in particular, whether the protective hood 16, in particular the protective hood lower part 40, is at least partially open or closed.

[0053] Alternatively, it is also conceivable for the safety unit 34 to be at least partially electrically operated. For example, it is alternatively conceivable for the safety unit 34 to have a detection unit for detecting the protective hood position. The detection unit can, for example, comprise a mechanical sensor, an optical sensor, or another sensor for detecting the protective hood position that appears appropriate to a person skilled in the art. It is conceivable for the safety unit 34 to comprise a control unit which is configured in particular to evaluate a signal from the detection unit and, depending thereon, to block or release the actuating unit 20. The control unit comprises in particular at least one processor and one 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 as a hard disk 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.

[0054] The safety unit 34 comprises a locking element 48. Closing the protective hood 16 moves the locking element 48 into an unlocked position. The locking element 48 is designed as a pin. Alternatively, it is also conceivable for the locking element 48 to be designed as a hook, a ramp-shaped element, or another locking element 48 that would be deemed appropriate by a person skilled in the art. The actuating unit 20 can be actuated when the locking element 48 is in the unlocked position. In Figures 4 and 5, the locking element 48 is in the unlocked position, with the lower part 40 of the protective hood being closed in particular and pressing against a stop pin 70 of the safety unit 34. In the unlocked state, the locking element 48 is in the unlocked position. The operating element 22 can be moved along the protective hood 16, in particular along the upper part 38 of the protective hood, when the locking element 48 is in the unlocked state.In the unlocked state of the locking element 48, the actuating unit 20, in particular the operating element 22, is free from intervention, in particular from the application of force, by the securing unit 34, in particular the locking element 48. The securing unit 34 can be actuated by a movement of at least part of the protective hood 16, in particular the protective hood lower part 40, relative to the securing unit 34, preferably the locking element 48. The locking element 48 can be moved by a movement of the protective hood lower part 40. 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 protective hood lower part 40 relative to the securing unit 34, preferably the locking element 48. In the locked state, the locking element 48 is in a locked position.In Figures 6 and 7, the locking element 48 is in the locking position, wherein the protective hood lower part 40 is, in particular, at least partially open, and the stop pin 70 of the securing unit 34 is free from the action of force by the protective hood lower part 40. The locking element 48 can only be moved into the unlocked position when the protective hood 16 is closed. Preferably, the securing unit 34 is designed such that the locking element 48 automatically moves into the locking state when the protective hood 16 is open, for example by means of a gravity-controlled mechanism, a spring element, or the like.

[0055] The locking element 48 is designed as a pin. The locking element 48 engages the actuating unit 20 when the protective hood 16 is at least partially open. When the protective hood 16 is at least partially open, the locking element 48 acts on the lever arm 60 of the actuating unit 20. The lever arm 60 has a recess 72 in which the locking element 48 is arranged in the locked state. When the protective hood 16 is at least partially open, the locking element 48 blocks the movement of the operating element 22 along the protective hood 16, in particular of the protective hood upper part 38. In the locked state, the locking element 48 blocks a movement, in particular a rotation, of the lever arm 60, in particular about the operating element rotation axis 24.

[0056] 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 safety unit 34, in particular the locking element 48, is rotatably mounted on the protective hood 16, in particular the protective hood upper part 38. Alternatively, however, it is also conceivable for the safety unit 34, in particular at least the locking element 48, to be rotatably mounted on a housing element of the machine tool 44.

[0057] The rotation of the locking element 48 can be generated by a movement of at least part of the protective hood 16. The protective hood lower part 40 moves the locking element 48 into the unlocked state when the protective hood 16 is closed. The protective hood 16, in particular the protective hood lower part 40, is arranged relative to the locking element 48 such that the protective hood lower part 40 strikes the securing unit 34, in particular the stop pin 70, when the protective hood 16 is closed and moves the locking element 48 into the unlocked position. The stop pin 70 is fixedly connected, in particular in a rotationally fixed manner, to the locking element 48. 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 to the protective hood lower part 40, regardless of the protective hood position.

[0058] The protective hood rotation axis 42 is arranged at a distance from and at least substantially parallel to the locking element rotation axis 50 and / or the operating element rotation axis 24. Alternatively, it is also conceivable for the protective hood rotation axis 42 to correspond to the operating element rotation axis 24. The locking element rotation axis 50 is arranged at a distance from and at least substantially parallel to the operating element rotation axis 24.

[0059] The protective hood 16 at least partially surrounds the securing unit 34. The securing unit 34, in particular at least the locking element 48, is arranged on a side of the protective hood 16 facing the tool receiving area 18. The securing unit 34, in particular at least the locking element 48, is arranged between the protective hood upper part 38 and the protective hood lower part

[0060] 40 arranged.

Claims

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 hood (16) which at least partially surrounds a tool receiving area (18) for the tool (14), and with an actuating unit (20) for actuating the clamping unit (12), characterized in that the actuating unit (20) has an operating element (22) which is movable at least partially along the protective hood (16) for actuation.

2. Machine tool device (10) according to claim 1, characterized in that the operating element (22) is movable about an operating element rotation axis (24), wherein a movement of the operating element (22) about the operating element rotation axis (24) can generate a movement of an actuating element (26) of the clamping unit (12) which is at least substantially parallel to the operating element rotation axis (24).

3. Machine tool device (10) according to claim 1 or 2, characterized in that the actuating unit (20) has a ramp-shaped actuating means (28).

4. Machine tool device (10) at least according to claim 2, characterized in that the actuating unit (20) has an actuating means (28) which at least partially surrounds the operating element rotary axis (24).

5. Machine tool device (10) according to one of the preceding claims, characterized in that 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°.

6. Machine tool device (10) according to one of the preceding claims, characterized in that the clamping unit (12) can be released by an actuation path (30) of the operating element (22) along the protective hood (16) by a maximum of 75°.

7. Machine tool device (10) according to claim 5 or 6, characterized in that the actuation path (30) has a free travel of at least 20°.

8. Machine tool device (10) according to one of the preceding claims, characterized in that the operating element (22) is arranged on a side of the protective hood (16) facing away from the tool holding area (18) when viewed in the radial direction.

9. Machine tool device (10) according to one of the preceding claims, characterized by a safety unit (34) which blocks the actuating unit (20) when the protective hood (16) is at least partially open.

10. Machine tool device (10) according to one of the preceding claims, characterized in that the operating element (22) is arranged in a fastening state of the clamping unit (12) on a side of the protective hood (16) facing away from an operating side (36). A machine tool device (10) according to one of the preceding claims, characterized in that the protective hood (16) has at least one upper protective hood part (38) and one lower protective hood part (40), which is rotatably arranged relative to the upper protective hood part (38) about a protective hood rotation axis (42). A machine tool device (10) at least according to claims 2 and 11, characterized in that the protective hood rotation axis (42) is spaced apart from and at least substantially parallel to the operating element rotation axis (24). A machine tool (44), in particular a hand-held circular saw, with a machine tool device (10) according to one of the preceding claims. A system (46) with a tool (14), in particular a circular saw blade, and with a machine tool (44) according to claim 13.

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