Machine tool device, machine tool and system

Abstract

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

Description

Background Art

[0001] A machine tool device has been proposed which has a clamping unit for fixing a tool, a protective hood which at least partially surrounds a tool receiving area for the tool, and an actuation unit for actuating the clamping unit. Summary of the invention

[0002] The invention is based on a machine tool device, in particular a hand-held circular saw device, having a clamping unit for fastening a tool, in particular a circular saw blade, a protective hood at least partially surrounding a tool receiving area for the tool and an actuation unit for actuating the clamping unit.

[0003] It is proposed that the operating unit has an operating element, which can be moved at least partially along the protective cover for operation. Through the configuration of the machine tool device according to the invention, the tool can be released from the state fixed on the clamping unit in a particularly simple and fast manner. Advantageously, the tool can be replaced in a particularly comfortable and time-saving manner. Advantageously, a particularly fast workflow can be ensured. Advantageously, a particularly space-saving and at the same time safe operation of the operating element can be achieved. Advantageously, an operating unit, in particular an operating element, can be provided, which can be operated in a particularly compact manner. Therefore, damage to the operating unit, in particular the operating element, can be advantageously prevented in a particularly simple and effective manner in terms of structure. Advantageously, an especially ergonomic operation of the operating unit, in particular the operating element, can be achieved. Advantageously, injuries to the operator when operating the operating unit can be avoided.

[0004] The operating element is particularly arranged for manual manipulation by a user. Preferably, the operating element can be moved along the protective cover by rotating around the operating element rotation axis. Preferably, the operating element can be moved at least substantially parallel to the surface, especially the outer surface, of the protective cover for manipulation. "Substantially parallel" should be understood here as the orientation of a direction relative to a reference direction, especially in a plane, wherein the direction has a deviation of less than 8°, advantageously less than 5° and particularly advantageously less than 2° relative to the reference direction. The operating unit preferably includes at least one lever arm, by means of which the operating element can be moved around the operating element rotation axis. The operating element is preferably rotatably supported on a part of the protective cover, preferably by means of a lever arm. Alternatively, it can also be considered that the operating element, in particular the lever arm, is movably, preferably rotatably supported on a housing element of the machine tool, which housing element is particularly different from the protective cover, etc. The operating element is preferably arranged spaced apart from the protective cover. The operating element can preferably be moved at least partially along the protective cover at a constant distance from the protective cover for manipulation. However, alternatively, it is also conceivable that the operating element rests on the guard cover and can be guided by the guard cover, especially the surface of the guard cover facing the operating element, when moving along the guard cover. Preferably, in order to release the tool from the state fixed on the clamping unit, only the operating element must be operated.

[0005] The clamping unit can be operated in particular without tools, preferably by means of a manipulation unit. Preferably, the clamping unit is fixedly, in particular, arranged in a rotationally fixed manner on the machine tool, in particular, arranged on the output spindle of the output unit of the machine tool. Alternatively, it is conceivable that the clamping unit is detachably arranged on the machine tool, in particular, arranged on the output spindle. The clamping unit is preferably arranged to fasten the tool, in particular, without tools, on the machine tool device. "Set" should be understood as a special setting, a special design and / or a special equipment. An object is set to be used for a specific function, which should be understood as satisfying and / or implementing the specific function in at least one application and / or operating state. Preferably, the tool can be driven in a rotational or vibrating manner, in particular around the rotation axis of the connection interface of the tool, in particular when it is fixed on the clamping unit. Preferably, the tool can be driven in a rotational or vibrating manner by the output spindle, in particular, when it is fixed on the machine tool by means of the clamping unit. In particular, when observed in a plane extending at least substantially perpendicular to the output axis of the output spindle, the clamping unit has an outer contour configured corresponding to the contour of the connection interface. "Substantially perpendicular" may be understood as an orientation of a direction relative to a reference direction, wherein the direction and the reference direction, in particular when viewed in the 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 is derived in particular from the course of the inner and outer delimiting contours of the connection interface. In the state in which the tool is fixed to the clamping unit, the output axis preferably extends at least substantially parallel to the axis of rotation of the connection interface.

[0006] The output unit is preferably configured to transmit a rotational and / or oscillating movement about an output axis to a tool that is fixed to the output unit by means of a clamping unit. Preferably, the output unit is operatively connected to a drive unit of a machine tool in a manner 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 an output spindle. Preferably, the rotational and / or oscillating movement of the output unit can be generated by the interaction of the output unit with a drive unit of a machine tool, which drive unit comprises at least one electric motor.

[0007] In another aspect of the present invention, which is considered in particular individually and in combination with other aspects of the present invention, it is proposed that the machine tool device includes a safety unit, which blocks the operating unit when the protective cover is at least partially opened. Advantageously, a machine tool device with particularly high operational safety can be provided. Advantageously, unintentional operation of the operating unit for releasing the tool from the clamping unit can be prevented. Advantageously, the tool can be prevented from falling when the clamping unit is released. Advantageously, a particularly low risk of injury to the user can be achieved. Advantageously, the tool can be quickly and simply replaced with particularly high user safety. The safety unit is preferably mechanically constructed. Preferably, the operating unit is blocked or released by the safety unit, especially automatically, according to the protective cover position of the protective cover. Preferably, the safety unit can be operated, especially automatically, according to the protective cover position. In particular, when the protective cover is closed, the safety unit releases the operation of the operating unit, especially automatically. The protective cover position is particularly given, whether the protective cover is at least partially opened or closed. Alternatively, it is also conceivable that the safety unit is at least partially electrically constructed. For example, it is conceivable that the safety unit has a detection unit for detecting the protective cover position. The detection unit may include, for example, a mechanical sensor, an optical sensor or other sensors that appear meaningful to a person skilled in the art for detecting the position of the protective cover. It is conceivable that the safety unit includes a control unit, which is particularly configured to analyze and evaluate the signal of the detection unit and block or release the operating unit according to the signal. The control unit particularly includes at least one processor and a storage element and an operating program stored on the storage element. The storage element is preferably configured as a digital storage medium, such as a hard disk, etc. It is also conceivable that the control unit of the safety unit is constituted by the control unit of the machine tool.

[0008] In addition, it is proposed that the operating element can move around the operating element rotation axis, wherein the movement of the operating element around the operating element rotation axis can generate the movement of the operating element of the clamping unit that is at least substantially parallel to the operating element rotation axis. In the state where the tool is fixed on the clamping unit, the operating element rotation axis is particularly at least substantially parallel to the output axis of the output spindle and / or the rotation axis of the connection interface of the tool. The movement of the operating element for manipulating the clamping unit preferably extends 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 on the clamping unit. The operating element is, for example, configured as a bolt, a pin or other operating elements that seem meaningful to a person skilled in the art. The clamping unit preferably has at least two states, particularly a loose state and a tightened state. In the loose state, the tool can preferably be removed from the clamping unit, particularly from the assembly position on the clamping unit, or can be arranged on the clamping unit in the assembly position. In the tightened state, the tool is fixed on the clamping unit in a state arranged on the clamping unit, particularly in the assembly position. By moving the operating element of the clamping unit, the clamping unit can be switched from a tightened state to a loosened state or from a loosened state to a tightened state. Advantageously, a particularly ergonomically operated arrangement of the operating unit can be achieved. Advantageously, a particularly high level of operating comfort can be achieved.

[0009] In addition, it is proposed that the operating unit has an inclined operating device. The operating device is particularly configured to act together with the operating element of the clamping unit to operate the clamping unit. Preferably, the operating device is configured to transmit the movement of the operating element to the operating element of the clamping unit, especially via a lever arm. The operating device is preferably arranged on the lever arm. The operating device is preferably connected to the operating element via the lever arm. The operating device is preferably fastened to the lever arm, especially in a torsionally fixed manner, for example, by means of a threaded connection, a latching connection, etc. It is conceivable that the lever arm is constructed in one piece or in multiple pieces. Alternatively, it is conceivable that the operating device is at least partially constructed integrally with the lever arm. "At least one unit or object, especially a lever arm and at least one other unit or other object, especially the operating device is at least partially constructed integrally with each other" should be understood in particular that at least one element of a unit or object is constructed integrally with at least one other element of another unit or another object. "Integrally" can be understood as at least materially connected, for example by a welding process, an adhesive process, an injection molding process and / or a process that seems meaningful to a person skilled in the art and / or advantageously as formed in one piece, for example by manufacturing from a single casting and / or by manufacturing by a single-component or multi-component injection molding method and advantageously from a single blank. The operating element is preferably fastened to the lever arm, in particular in a torque-proof manner, for example by means of a threaded connection, a latching connection, etc. Alternatively, it is also conceivable that the operating element is at least partially constructed integrally with the lever arm. In particular, the operating device and the operating element are arranged on the ends of the lever arm that are opposite to each other. Advantageously, the movement of the operating element along the protective cover can be converted into a movement for operating the clamping unit in a particularly simple manner in terms of construction. Advantageously, a particularly uniform release of the clamping unit can be achieved.

[0010] It is further proposed that the operating unit has an operating device, in particular the above-mentioned operating device, which at least partially surrounds the operating element rotation axis. Preferably, the operating device surrounds the operating element rotation axis with an angular range of up to 75°. The angular range of the operating device around the operating element rotation axis is preferably at least 20°. Advantageously, a particularly comfortable and uniform operation of the clamping unit can be achieved.

[0011] It is further proposed that the clamping unit can be released by an operating stroke of the operating element along at least 40° of the protective cover, in particular around the operating element rotation axis. Preferably, the clamping unit can be released by an operating stroke of the operating element, which is at least 40° along the protective cover starting from the end position of the operating element in the tightened state of the clamping unit. However, it is also conceivable that the operating unit is configured so that the operating stroke, in particular for releasing the clamping unit, is less than 40°, preferably starting from the end position of the operating element in the tightened state of the clamping unit. Preferably, the operating stroke of the operating element for producing the tightened state starting from the end position of the operating element in the tightened state of the clamping unit is less than the operating stroke for producing the loosened state starting from the end position of the operating element in the tightened state of the clamping unit. Advantageously, the clamping unit can be released particularly simply and quickly, wherein, in particular, an unintentional release of the clamping unit can be prevented at the same time. Advantageously, tool replacement can be performed particularly quickly and comfortably. Advantageously, a particularly high level of operating comfort can be achieved when releasing the clamping unit.

[0012] It is further proposed that the operating stroke of the operating element along the protective cover for operating the clamping unit, in particular the above-mentioned operating stroke, is a maximum of 75°, in particular around the operating element rotation axis. Preferably, the operating stroke of the operating element along the protective cover for releasing the clamping unit is a maximum of 75°, in particular around the operating element rotation axis, preferably starting from the end position of the operating element in the tightened state of the clamping unit. In an alternative embodiment of the operating unit, it is also conceivable that the operating stroke of the operating element along the protective cover for operating the clamping unit, in particular for releasing the clamping unit from the tightened state, is greater than 75°, in particular around the operating element rotation axis, 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 comfortably and quickly. Advantageously, the space requirement for operating, in particular 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 operating stroke has an idle stroke of at least 20°, in particular around the rotation axis of the operating element. In particular, the idle stroke extends from the end position of the operating element in the tightened state of the clamping unit. In particular, the operating unit, preferably the operating device, applies an operating action, in particular an operating force, to the clamping unit, in particular the operating element of the clamping unit, only in a state where the operating element is arranged outside the idle stroke. The clamping unit, in particular the operating element, preferably has no operating action, in particular an operating force, by the operating unit, in particular the operating device of the operating unit, in a state where the operating element is arranged in the idle stroke. It is conceivable that, in a state where the operating element is arranged in the idle stroke, the operating device of the operating unit is arranged spaced apart from the operating element of the clamping unit. However, it is also conceivable as an alternative that, in a state where the operating element is arranged in the idle stroke, the operating device of the operating unit abuts against the operating element of the clamping unit. Preferably, at least in a state where the operating element is arranged outside the idle stroke, the operating device, in particular the force transmission surface of the operating device abuts against the operating element of the clamping unit. Preferably, at least in the state in which the operating element is arranged outside the idle travel, the operating means, in particular the force transmission surface of the operating element, exerts a force on the operating element of the clamping unit for operating, in particular for releasing the clamping unit. Advantageously, an unintentional release of the clamping unit can be prevented by the operating unit in a structurally simple and effective manner. Advantageously, a particularly high level of operating safety can be achieved.

[0014] It is further proposed that the operating element is arranged on the side of the protective cover facing away from the tool receiving area, as seen in the radial direction. The radial direction relates in particular to the operating element rotation axis. Advantageously, an operating unit can be provided with a particularly advantageous arrangement of the operating element in terms of operating safety. Advantageously, an operator can be prevented from gripping the tool receiving area, in particular the tool. Advantageously, the risk of injury when operating the operating element can be kept particularly low. Advantageously, a particularly comfortable operation of the operating element can be achieved.

[0015] It is further proposed that the operating element is arranged on the side of the protective cover facing away from the operating side in the clamping unit, in particular in the above-mentioned fastened state. The operator is preferably on the operating side at least in the operating state. The main handle of the machine tool, in particular the machine tool device, etc. is preferably arranged on the operating side. Advantageously, the arrangement of the operating element according to the invention can prevent unintentional manipulation, in particular release, of the clamping unit, at least in the operating state, in a particularly simple and effective manner.

[0016] In addition, it is proposed that the safety unit includes a locking element, wherein the closing of the protective cover moves the locking element to the unlocked position. The locking element is, for example, configured as a pin, a hook, a ramp-shaped element or other locking elements that seem meaningful to a person skilled in the art. Preferably, the operating unit can be operated in the unlocked position of the locking element. Preferably, the operating element can move along the protective cover in the unlocked position of the locking element. In particular, the operating unit, preferably the operating element, is not engaged, especially by force, by the safety unit, preferably the locking element in the unlocked position of the locking element. Preferably, the safety unit can be operated by the movement of at least a part of the protective cover. In particular, the locking element can be moved by the movement of at least a part of the protective cover. Preferably, the locking element can be moved from the unlocked state to the locked state and / or from the locked state to the unlocked state by the movement of at least a part of the protective cover. In the unlocked state, the locking element is particularly in the unlocked position. In the locked state, the locking element is particularly in the locked position. Preferably, the locking element can only be moved to the unlocked state when the protective cover is closed. Preferably, the safety unit is designed in such a way that the locking element automatically moves into the locked state when the protective cover is open, for example by means of a gravity control mechanism, by means of a spring element, etc. Closing the protective cover can advantageously be used to unlock the safety unit. Advantageously, the actuation unit can be automatically actuated by closing the protective cover. Advantageously, a particularly high level of operating comfort can be achieved.

[0017] It is further proposed that the safety unit comprises a locking element, in particular the above-mentioned locking element, which is configured as a pin and engages in the operating unit when the protective cover is at least partially opened. The locking element preferably acts on the lever arm of the operating unit when the protective cover is at least partially opened. It is conceivable that the lever arm has a groove, a cutout, etc., in which the locking element is arranged in the locked state. In particular, when the protective cover is at least partially opened, the locking element blocks the movement of the operating element along the protective cover. The locking element preferably blocks the movement, in particular the rotation, in particular the rotation around the rotation axis of the operating element of the lever arm in the locked state. Advantageously, the manipulation of the clamping unit by means of the operating unit can be prevented in a particularly effective and structurally simple manner and thus also the falling of the tool can be prevented when the protective cover is at least partially opened.

[0018] It is further proposed that the safety unit comprises a locking element, in particular the above-mentioned locking element, which can be moved into an unlocked position, in particular the above-mentioned unlocked position, or into a locked position, in particular the above-mentioned locked position, by rotation about a rotation axis of the locking element. For example, the safety unit, in particular the locking element, is rotatably supported on a part of the protective cover, on a housing element of the machine tool or on another housing element of the machine tool. Advantageously, a particularly space-saving and lightweight safety unit can be provided.

[0019] It is further proposed that the rotation of the locking element can be produced by the movement of at least a part of the protective cover. Preferably, the protective cover, in particular at least a part of the protective cover, is arranged relative to the locking element in such a way that the at least a part abuts against the securing unit when the protective cover 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, in particular functionally preferably directly connected to the protective cover, in particular at least a part of the protective cover, independently of the position of the protective cover. Advantageously, a particularly simple and comfortable actuation of the securing unit, which is advantageous in terms of operational safety, can be achieved.

[0020] In addition, it is proposed that the protective cover has at least one protective cover upper part and a protective cover lower part, which is rotatably arranged around the protective cover rotation axis relative to the protective cover upper part. The protective cover upper part is preferably fixedly, especially torque-proofly connected to a housing element, another housing element or an additional housing element of the machine tool. The operating element is preferably movable along the protective cover upper part for operating the clamping unit. It is conceivable that the protective cover upper part has an inclined surface, etc., along which the operating element can move for operating the clamping unit. The inclined surface is especially mounted on the base body of the protective cover upper part. It is conceivable that the inclined surface is constructed separately from the base body and is fastened to the base body, for example, by means of a threaded connection, a latch connection, etc., or the inclined surface is constructed integrally with the base body. However, it is also conceivable that the protective cover upper part is constructed without an inclined surface. The protective cover upper part and the protective cover lower part at least partially surround the tool receiving area. The protective cover lower part is especially pivotable relative to the protective cover upper part between the open state of the protective cover and the closed state of the protective cover. Preferably, the securing unit can be actuated by co-action, in particular movement, of the guard hood lower part. Preferably, when the guard hood is closed, the guard hood lower part moves the locking element into the unlocked state. Advantageously, the securing unit can be actuated, in particular automatically, by a relative movement of the guard hood lower part relative to the guard hood upper part. Advantageously, a particularly high level of operating comfort can be achieved.

[0021] Furthermore, it is proposed that the guard cover rotation axis is spaced apart from the operating element rotation axis and is arranged at least substantially parallel. Alternatively, it is also conceivable that the guard cover rotation axis corresponds to the operating element rotation axis. Advantageously, the space requirement of the operating unit and the guard cover can be kept particularly compact.

[0022] Furthermore, it is proposed that the guard hood rotation axis is spaced apart from the locking element rotation axis and is arranged at least substantially parallel. Advantageously, a particularly advantageous force chain can be achieved between the guard hood and the safety unit for actuating the safety unit. Advantageously, the safety unit can be actuated with particularly low expenditure of force.

[0023] Furthermore, it is proposed that the locking element rotation axis is spaced apart from the operating element rotation axis and is arranged at least substantially parallel to the operating element rotation axis. Advantageously, the space requirement of the operating unit and the safety unit can be kept particularly compact. Advantageously, a particularly advantageous force chain between the safety unit and the operating unit can be realized for locking and / or unlocking the operating unit.

[0024] It is further proposed that the protective cover at least partially surrounds the safety unit. Preferably, the safety unit, in particular at least the locking element, is arranged on the side of the protective cover facing the tool receiving area. Preferably, the safety unit, in particular at least the locking element, is arranged between the protective cover upper part and the protective cover lower part. Advantageously, the safety unit can be protected from damage, in particular from direct impacts. By the arrangement of the safety unit according to the invention, an unintentional unlocking of the safety unit can be prevented particularly simply and effectively.

[0025] In addition, a machine tool, in particular a hand-held circular saw, having a machine tool device according to the present invention is proposed. The machine tool is preferably configured as a portable machine tool, in particular as a hand-held machine tool. "Portable machine tool" should be understood here in particular as a machine tool for processing workpieces, which can be transported by an operator without a transporter. The portable machine tool has a mass of less than 40kg, preferably less than 10kg and particularly preferably less than 5kg. The machine tool is preferably configured as a hand-held circular saw. However, it is also conceivable that the machine tool has other configurations that seem meaningful to those skilled in the art, such as angle grinders, table circular saws, vibrating machine tools, grinding machines, etc. By the configuration according to the present invention, a machine tool can be advantageously provided that can particularly quickly release and replace the tool on the machine tool. Advantageously, a particularly efficient workflow can be achieved.

[0026] Furthermore, a system is proposed with a tool, in particular a circular saw blade, and a machine tool according to the invention. As an alternative to the design as a circular saw blade, it is also conceivable that the tool can be designed as a grinding wheel, a cutting wheel or a polishing wheel or as another tool that appears to be appropriate to a person skilled in the art. Advantageously, a system can be provided that allows the tool to be released from the machine tool particularly quickly and easily. Advantageously, the tool can be replaced particularly quickly and comfortably. Advantageously, particularly effective work with the machine tool can be achieved.

[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 to be limited to the applications and embodiments described above. The machine tool device according to the invention, the machine tool according to the invention and / or the system according to the invention may have numbers that deviate from the numbers of individual elements, components and units described herein, in particular in order to meet the working method described herein. Furthermore, in the value ranges given in the present disclosure, the values ​​that lie within the extreme values ​​are also to be regarded as disclosed and can be used arbitrarily. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Further advantages are obtained from the following description of the drawings. The drawings show embodiments of the invention. The drawings, the description and the claims contain features in a plurality of combinations. It will also be appropriate for a person skilled in the art to consider the features individually and combine them into other meaningful combinations. Here is shown:

[0029] Figure 1 : A schematic diagram of a system according to the invention, comprising a machine tool according to the invention and a tool arranged on the machine tool,

[0030] Figure 2 : A perspective exploded view of a machine tool according to the invention and of a machine tool device according to the invention,

[0031] Figure 3 : Figure 1 A three-dimensional cutaway view of a machine tool,

[0032] Figure 4 : A schematic front view of a part of a machine tool according to the invention without a tool in the unlocked state of a safety unit of a machine tool device according to the invention,

[0033] Figure 5 : A schematic perspective rear view of a part of a machine tool according to the invention with a tool in the unlocked state of a safety unit,

[0034] Figure 6 : A schematic front view of a part of a machine tool according to the invention without a tool in the locked state of a safety unit,

[0035] Figure 7 : A schematic perspective rear view of a part of a machine tool according to the invention, with a tool in the locked state of a safety unit. DETAILED DESCRIPTION

[0036] Figure 1 A system 46 is shown having a tool 14 and a machine tool 44. The machine tool 44 is configured as a portable machine tool, in particular a handheld machine tool. The machine tool 44 is configured as a handheld circular saw. However, it is also conceivable that the machine tool 44 has another configuration that is meaningful to a person skilled in the art, such as an angle grinder, a table circular saw, an oscillating machine tool, a grinding machine, etc. The tool 14 is configured as a circular saw blade. Alternatively, it is also conceivable that the tool 14 is configured as a grinding wheel, a cutting wheel, a polishing wheel, or another tool 14 that is meaningful to a person skilled in the art.

[0037] The machine tool 44 includes a machine tool device 10. The machine tool device 10 includes a clamping unit 12 for fixing a tool 14. The clamping unit 12 can be operated without a tool. The machine tool device 10 includes an operating unit 20, which is particularly used to operate the clamping unit 12 without a tool. The clamping unit 12 is fixed, particularly rotationally fixed, on the machine tool 44, particularly on 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, particularly on the output spindle. The clamping unit 12 is configured to fasten the tool 14 to the machine tool device 10, particularly without a tool. The tool 14 can be driven in a rotational or vibrating manner in a state fixed on the clamping unit 12, particularly around the rotation axis 52 of the connection interface 54 of the tool 14. The tool 14 can be driven preferably in a rotational or vibrating manner through the output spindle in a state fixed on the machine tool 44 by means of the clamping unit 12. In particular, viewed in a plane extending at least substantially perpendicularly to the output axis 56 of the output spindle, the clamping unit 12 has an outer contour that is designed to correspond to the contour of the connection interface 54. The contour of the connection interface 54 is derived from the course of the inner and outer limiting contours of the connection interface 54. When the tool 14 is fixed to the clamping unit 12, the output axis 56 extends at least substantially parallel to the rotation axis 52 of the connection interface 54. The output axis 56 corresponds to the rotation axis 52 of the connection interface 54 in the state of the tool 14 fixed to the clamping unit 12.

[0038] The clamping unit 12 is designed as a quick-release clamping device, such as disclosed in WO 2021 / 130026 A1, but has six retaining wings designed to correspond to the connection interface 54 (see also Figure 2 ). The disclosure of WO 2021 / 130026 A1 relating to the quick-release clamping device disclosed therein should in particular be considered as part of the present description with respect to the configuration of the clamping unit 12. However, it is also conceivable that the clamping unit 12 is configured with four retaining wings according to the quick-release clamping device known from WO 2021 / 130026 A1, as a quick-release clamping device disclosed, for example, in DE 10 2017 213 669 A1, or as another quick-release clamping device that appears to be meaningful to a person skilled in the art.

[0039] The output unit is configured to transmit a rotational and / or oscillating movement about an output axis 56 to a tool 14 fixed to the output unit by means of a clamping unit 12. The output unit is operatively connected to a drive unit of a machine tool 44 in a manner 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 an output spindle. The rotational and / or oscillating movement of the output unit can preferably be generated by the interaction of the output unit with a drive unit of the machine tool 44, which comprises at least one electric motor.

[0040] The machine tool device 10 comprises a protective cover 16, which at least partially surrounds a tool receiving area 18 for a tool 14. An operating unit 20 has an operating element 22, which can be moved at least partially along the protective cover 16 for operation. The operating element 22 is provided for manual operation 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 cover 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 an outer surface, of the protective cover 16 for operation.

[0041] The operating unit 20 comprises at least one lever arm 60. By means of the lever arm 60, the operating element 22 can be moved about the operating element rotation axis 24. The operating element 22 is rotatably supported on a part of the protective hood 16, in particular on the protective hood upper part 38 of the protective hood 16, in particular by means of the lever arm 60. The operating element 22 can be moved along the protective hood upper part 38 for operating the clamping unit 12. Alternatively, it is also conceivable that the operating element 22, in particular the lever arm 60, is movably, preferably rotatably supported on a housing element or the like of the machine tool 44, which housing element is in particular different from the protective hood 16. The operating element 22 is arranged spaced apart from the protective hood 16, in particular the protective hood upper part 38. The operating element 22 can be moved at least partially along the protective hood 16, in particular the protective hood upper part 38, at a constant distance from the protective hood 16, in particular the protective hood upper part 38, for operation. However, it is also conceivable that, during a movement along the guard hood 16, in particular the guard hood upper part 38, the operating element 22 rests against the guard hood 16 and can be guided in particular by the guard hood 16, preferably by a surface 58 of the guard hood 16 facing the operating element 22. In order to release the tool 14 from the state in which it is fixed to the clamping unit 12, only the operating element 22 has to be actuated.

[0042] By moving the operating element 22 about the operating element rotation axis 24 , a movement of the actuating element 26 of the clamping unit 12 can be produced which extends at least substantially parallel to the operating element rotation axis 24 (see also Figure 3). When the tool 14 is fixed to the clamping unit 12, the operating element rotation axis 24 extends 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. The movement of the operating element 22 for operating the clamping unit 12 extends in a plane, which, when the tool 14 is fixed to the clamping unit 12, extends at least substantially perpendicular to the output axis 56 and / or the rotation axis 52 of the tool 14.

[0043] The operating element 26 is designed, for example, as a bolt, a pin or another operating element 26 that seems meaningful to a person skilled in the art. The clamping unit 12 has at least two states, in particular a loose state and a tightened state. In the loose state, the tool 14 can be removed from the clamping unit 12, in particular from the assembly position on the clamping unit 12, or can be arranged on the clamping unit 12 in the assembly position. In the tightened 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 assembly position. By moving the operating element 26 of the clamping unit 12, the clamping unit 12 can be switched from the tightened state to the loose state or from the loose state to the tightened state.

[0044] exist Figure 1 , the operating unit 20, in particular the operating element 22, is shown in two different positions. The operating element 22 indicated by the solid line corresponds to the tightened state of the clamping unit 12, wherein the operating element 22 is in the end position of the operating element 22 in the tightened state of the clamping unit 12. The operating element 22 indicated by the dashed line corresponds to the loosened state of the clamping unit 12, wherein the operating element 22 is in the end position of the operating element 22 in the loosened state of the clamping unit 12. In addition, it is conceivable that the operating unit 20 has a spring element, which acts on the operating element 22 in the direction of the end position of the operating element 22 in the tightened state of the clamping unit 12.

[0045] The operating unit 20 comprises an inclined-surface operating device 28. The operating device 28 is provided for cooperating with the operating element 26 of the clamping unit 12 to operate the clamping unit 12. The operating device 28 is provided for transmitting the movement of the operating element 22 to the operating element 26 of the clamping unit 12, in particular via a lever arm 60. The operating device 28 is arranged on the lever arm 60. The operating device 28 is connected to the operating element 22 via the lever arm 60. The lever arm 60 is constructed in two parts. However, it is also conceivable that the lever arm 60 is constructed in one piece or is composed of more than two parts. The operating device 28 is fastened to the lever arm 60 by means of a screw 66. It is also conceivable that the operating device 28 is fastened to the lever arm 60 in a particularly rotationally fixed manner by means of a latch connection, a rivet connection, etc., or that the operating device 28 is at least partially constructed integrally with the lever arm 60. In particular, the operating device 28 and the operating element 22 are arranged on the ends of the lever arm 60 that are opposite to each other.

[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 over an angular range of a maximum of 75°. The angular range of the actuating means 28 around the operating element rotation axis 24 is at least 20°.

[0047] The clamping unit 12 can be released by the operating element 22 along an actuation travel 30 of at least 40° of the protective hood 16. The clamping unit 12 can be released by an actuation travel 30 of at least 40° of the operating element 22, starting from the end position of the operating element 22 in the tightened state of the clamping unit 12, along the protective hood 16, in particular the protective hood upper part 38. However, it is alternatively conceivable that the operating unit 20 is designed such that the actuation travel 30, in particular for releasing the clamping unit 12, is less than 40° starting from the end position of the operating element 22 in the tightened state of the clamping device 12. The actuation travel of the operating element 22 starting from the end position of the operating element 22 in the loose state of the clamping unit 12 for producing the tightened state is in particular smaller than the actuation travel 30 starting from the end position of the operating element 22 in the tightened state of the clamping unit 12 for producing the loosened state.

[0048] The actuation travel 30 of the operating element 22 along the guard 16 for actuating the clamping unit 12 is a maximum of 75°. The actuation travel 30 of the operating element 22 along the guard 16, in particular the guard 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 tightened state of the clamping unit 12. Alternatively, it is also conceivable that the actuation travel 30 of the operating element 22 along the guard 16 for actuating the clamping unit 12, in particular for releasing the clamping unit 12 from the tightened state, is greater 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°.

[0049] The actuating travel 30 has an idle travel of at least 20°. The idle travel extends from the end position of the operating element 22 in the tightened state of the clamping unit 12. The actuating unit 20, in particular the actuating means 28, exerts an actuating action, in particular an actuating force, on the clamping unit, in particular the actuating element 26 of the clamping unit 12 only when the actuating element 22 is arranged outside the idle travel. The clamping unit 12, in particular the actuating element 26, has no actuating action, in particular an actuating force, by the actuating unit 20, in particular the actuating means 28 of the actuating unit 20, when the actuating element 22 is arranged within the idle travel. The force transmission surface 74 of the actuating means 28, in particular the actuating element 26, exerts a force on the actuating element 26 of the clamping unit 12 when the actuating element 22 is arranged outside the idle travel.

[0050] Viewed in the radial direction, the operating element 22 is arranged on the side of the protective hood 16 facing away from the tool receiving area 18. The radial direction relates in particular to the operating element rotation axis 24. The operating element 22 is arranged on the side of the protective hood 16 facing away from the operating side 36 in the tightened state of the clamping unit 12. At least during normal operation of the machine tool 44, the operator is on the operating side 36. The main handle 68 of the machine tool 44, in particular the machine tool device 10, is arranged on the operating side 36.

[0051] The power tool device 10 comprises at least one securing unit 34 which blocks the actuating unit 20 when the protective hood 16 is at least partially opened (see Figures 4 to 7 The safety unit 34 is mechanically constructed. The operating unit 20 is blocked or released by the safety unit 34, in particular automatically, depending on the protective cover 16, in particular the protective cover lower part 40 relative to the protective cover upper part 38. The protective cover lower part 40 is arranged rotatably around the protective cover rotation axis 42 relative to the protective cover upper part 38.

[0052] The guard hood upper part 38 is fixedly, in particular, connected to a housing element of the machine tool 44 in a rotationally fixed manner. The guard hood upper part 38 has an inclined surface 32, along which the operating element 22 can be moved for actuating the clamping unit 12. The inclined surface 32 is mounted on a base body 76 of the guard hood upper part 38. It is conceivable that the inclined surface 32 is constructed separately from the base body 76 and is fastened to the base body 76, for example, by means of a screw connection or a latch connection, or that the inclined surface 32 is constructed integrally with the base body 76. However, it is also conceivable that the guard hood upper part 38 is constructed without the inclined surface 32 as an alternative. The guard hood upper part 38 and the guard hood lower part 40 at least partially surround the tool receiving area 18. The inclined surface 32 has a contact surface 62 for placing the fingertips of an operator when operating the operating element 22. The operating element 22 has a gripping surface 64 for placing the finger of an operator when operating the operating element 22. To release the clamping unit 12 , the operating element 22 can be moved from its end position in the tightened state of the clamping unit 12 , in particular in the direction of the operating side 36 , preferably into its end position in the released state of the clamping unit 12 .

[0053] The guard hood lower part 40 can be pivoted relative to the guard hood upper part 38 between an at least partially open state of the guard hood 16 and a closed state of the guard hood 16. The securing unit 34 can be actuated, in particular automatically, depending on the guard hood position. The securing unit 34 preferably automatically releases the actuation of the actuation unit 20 when the guard hood 16, in particular the guard hood lower part 40, is closed. The guard hood position specifies in particular whether the guard hood 16, in particular the guard hood lower part 40, is at least partially open or closed.

[0054] Alternatively, it is also conceivable that the safety unit 34 is at least partially electrically constructed. For example, it is alternatively conceivable that the safety unit 34 has a detection unit for detecting the position of the protective cover. The detection unit may, for example, include a mechanical sensor, an optical sensor, or another sensor for detecting the position of the protective cover that seems meaningful to a person skilled in the art. It is conceivable that the safety unit 34 includes a control unit, which is particularly configured to analyze and evaluate the signal of the detection unit and block or release the operating unit 20 according to the signal. The control unit particularly includes at least one processor and a storage element and an operating program stored on the storage element. The storage element is preferably constructed as a digital storage medium, for example, as a hard disk, etc. It is also conceivable that the control unit of the safety unit 34 is at least partially composed of the control unit of the machine tool 44.

[0055] The safety unit 34 comprises a locking element 48. Closing the protective cover 16 moves the locking element 48 into the 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, a ramp-shaped element or another locking element 48 that appears to be meaningful to a person skilled in the art. The actuation unit 20 can be actuated in the unlocked position of the locking element 48. Figure 4 and Figure 5 In the unlocked state, the locking element 48 is in the unlocked position, wherein the shield lower part 40 is in particular closed and pressed against the stop pin 70 of the safety unit 34. In the unlocked state, the locking element 48 is in the unlocked position. In the unlocked state of the locking element 48, the operating element 22 can move along the shield 16, in particular along the shield upper part 38. In the unlocked state of the locking element 48, the operating unit 20, in particular the operating element 22 is not engaged, in particular acted upon by a force, by the safety unit 34, in particular the locking element 48. The safety unit 34 can be actuated by movement of at least a portion of the shield 16, in particular the shield lower part 40 relative to the safety unit 34, preferably the locking element 48. The locking element 48 can be moved by movement of the shield lower part 40. The locking element 48 can be moved from the unlocked state to the locked state and / or from the locked state to the unlocked state by movement of at least a portion of the shield 16, in particular by movement of the shield lower part 40 relative to the safety unit 34, preferably relative to the locking element 48. In the locked state, the locking element 48 is in the locked position. In Figure 6 and Figure 7 4 , the locking element 48 is in the locked position, wherein the guard hood lower part 40 is at least partially opened and the stop pin 70 of the securing unit 34 is not acted upon by the force of the guard hood lower part 40. The locking element 48 can only be moved into the unlocked position when the guard hood 16 is closed. Preferably, the securing unit 34 is designed such that the locking element 48 automatically moves into the locked position when the guard hood 16 is opened, for example by means of a gravity control mechanism, by means of a spring element, etc.

[0056] The locking element 48 is designed as a pin. When the protective hood 16 is at least partially opened, the locking element 48 engages in the actuating unit 20. When the protective hood 16 is at least partially opened, 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 opened, the locking element 48 blocks a movement of the actuating element 22 along the protective hood 16, in particular the protective hood upper part 38. In the locked state, the locking element 48 blocks a movement, in particular a rotation, in particular a rotation about the actuating element rotation axis 24 of the lever arm 60.

[0057] The locking element 48 can be moved into the unlocked position or the locked position by rotating the locking element 48 about the locking element rotation axis 50. The safety unit 34, in particular the locking element 48, is rotatably supported on the guard 16, in particular the guard upper part 38. However, it is also conceivable that the safety unit 34, in particular at least the locking element 48, is rotatably supported on a housing element of the machine tool 44.

[0058] The rotation of the locking element 48 can be generated by the movement of at least a part of the protective cover 16. When the protective cover 16 is closed, the protective cover lower part 40 moves the locking element 48 into the unlocked state. The protective cover 16, in particular the protective cover lower part 40, is arranged relative to the locking element 48 so that when the protective cover 16 is closed, the protective cover lower part 40 stops on the securing unit 34, in particular the stop pin 70, and the locking element 48 moves into the unlocked position. The stop pin 70 is fixedly, in particular non-rotatably connected to the locking element 48. In particular, the stop pin 70 is integrally formed with the locking element 48. Alternatively, it is also conceivable that the securing unit 34, in particular at least the locking element 48 is mechanically, in particular preferably directly connected to the protective cover 16, in particular the protective cover lower part 40, independently of the protective cover position.

[0059] The guard cover rotation axis 42 is arranged at least substantially parallel to the locking element rotation axis 50 and / or the operating element rotation axis 24. Alternatively, it is also conceivable that the guard cover rotation axis 42 corresponds to the operating element rotation axis 24. The locking element rotation axis 50 is arranged at least substantially parallel to the operating element rotation axis 24.

[0060] The protective cover 16 at least partially surrounds the securing unit 34. The securing unit 34, in particular at least the locking element 48, is arranged on the side of the protective cover 16 facing the tool receiving area 18. The securing unit 34, in particular at least the locking element 48, is arranged between the protective cover upper part 38 and the protective cover lower part 40.

Claims

1. A machine tool device (10), in particular a hand-held circular saw device, comprising: A clamping unit (12) for fixing a tool (14), in particular a circular saw blade, a protective cover (16) at least partially surrounding a tool receiving area (18) for the tool (14), and an operating unit (20) for operating the clamping unit (12), It is characterized in that The operating unit (20) has an operating element (22) which can be moved at least partially along the protective hood (16) for operation.

2. The 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 the 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) extending at least substantially parallel to the operating element rotation axis (24).

3. The 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. The machine tool device (10) according to at least claim 2, characterized in that The operating unit (20) has an operating device (28) which at least partially surrounds the operating element rotation axis (24).

5. The machine tool device (10) according to claim 1, characterized in that The clamping unit (12) can be released by an actuation travel (30) of at least 40° along the protective hood (16) of the operating element (22).

6. The machine tool device (10) according to claim 1, characterized in that The clamping unit (12) can be released by an actuation travel (30) of the operating element (22) along the protective hood (16) of a maximum of 75°.

7. The machine tool device (10) according to claim 5 or 6, characterized in that The actuating travel (30) has an idle travel of at least 20°.

8. The machine tool device (10) according to claim 1, characterized in that The operating element (22) is arranged on a side of the protective hood (16) facing away from the tool receiving area (18) when viewed in the radial direction.

9. The machine tool device (10) according to claim 1, characterized in that A securing unit (34) is provided which blocks the actuating unit (20) when the protective cover (16) is at least partially opened.

10. The machine tool device (10) according to claim 1, characterized in that The operating element (22) is arranged on a side of the protective hood (16) facing away from the operating side (36) when the clamping unit (12) is in a fastened state.

11. The machine tool device (10) according to claim 1, characterized in that The protective hood (16) has at least one protective hood upper part (38) and a protective hood lower part (40), which is arranged rotatably relative to the protective hood upper part (38) about a protective hood rotation axis (42).

12. The machine tool device (10) according to at least claim 2 and 11, characterized in that The guard hood rotation axis (42) is arranged at a distance from the operating element rotation axis (24) and at least substantially parallel to it.

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

14. A system (46) comprising a tool (14), in particular a circular saw blade, and a machine tool (44) according to claim 13.

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