Patent Publication Number: US-2023142025-A1

Title: Hand-Held Power Tool Having an Alignment Apparatus

Description:
PRIOR ART 
     The present invention relates to a hand-held power tool, in particular a drill driver, having a housing, in which at least one drive unit for driving a tool holder is arranged, wherein the tool holder is designed to hold an insertable tool. 
     GB 2 358 926 A discloses a hand-held power tool of this type which has a drive unit for driving a tool holder. In addition, this hand-held power tool is assigned an additional handle, which visualizes an alignment of the hand-held power tool. In this case, the additional handle can have LEDs which indicate the alignment of the additional handle or of the hand-held power tool in a manner similar to a spirit level. 
     DISCLOSURE OF THE INVENTION 
     The invention relates to a hand-held power tool, in particular a drill driver, having a housing, in which at least one drive unit for driving a tool holder is arranged, wherein the tool holder is designed to hold an insertable tool. An alignment apparatus having a control unit and having at least one luminous element arranged on the housing is provided, wherein the alignment apparatus is designed to determine, in real time, during operation of the hand-held power tool, a current deviation of a machining angle, which can be selected via the control unit and which is to be formed between an insertable tool that is arrangeable in the tool holder and a workpiece surface that is to be machined by the insertable tool, from an actual inclination angle between the insertable tool that is arrangeable in the tool holder and the workpiece surface to be machined by the insertable tool, and to visualize said deviation by means of the at least one luminous element. 
     The invention thus makes it possible to provide a hand-held power tool in which the alignment apparatus enables the hand-held power tool to be aligned in a simple and uncomplicated manner at a desired angle to the machining surface. Improved handling of the hand-held power tool can thus be made possible. 
     The at least one luminous element is preferably designed at least to emit a first and a second luminous color. The first luminous color and the second luminous color are preferably different. 
     Thus, two alignments can be visualized in a simple and uncomplicated manner by the at least one luminous element emitting two different luminous colors. 
     The at least one luminous element preferably emits the first luminous color when the predetermined deviation exceeds a predetermined threshold value, and emits the second luminous color when the predetermined deviation is less than or equal to the predetermined threshold value. 
     Thus, arrangement of the hand-held power tool at the desired machining angle relative to the machining surface can be visualized in a simple manner. 
     The at least one luminous element is preferably arranged on an upper side of the housing, in particular an upper side of the housing which faces away from an associated handle. 
     Arrangement of the at least one luminous element comparatively close to a user of the hand-held power tool can thus be made possible in a simple and uncomplicated manner, enabling the user of the hand-held power tool to reliably recognize the emitted luminous color. 
     According to one embodiment, the at least one luminous element is arranged at an end of the housing remote from the tool holder and/or at an end adjacent to the tool holder. 
     Thus, a suitable position of the at least one luminous element can be specified in a simple manner. 
     The control unit preferably has at least one further luminous element. 
     Safe and reliable visualization can thus be made possible by the luminous elements. 
     At least one angle value is preferably stored in the control unit and can be selected as the selectable machining angle. 
     This enables simple and user-friendly operation of the alignment apparatus. 
     The control unit can preferably be coupled to an external device, wherein the selectable machining angle can be selected by means of the external device. 
     In this way, an alternative adjustment possibility can be provided for the alignment apparatus. 
     According to one embodiment, the control unit is arranged on an upper side, which faces the drive unit, of a base region of the housing of the hand-held power tool. 
     Thus, a suitable arrangement of the control unit can be made possible in a simple manner. 
     Working field lighting is preferably provided, which is assigned to the alignment apparatus, wherein the working field lighting has the at least one luminous element. 
     In this way, a compact alignment apparatus can be provided. 
     The control unit preferably has the working field lighting. 
     This enables simple and uncomplicated arrangement of the working field lighting. 
     The control unit has at least one further display element for displaying further functions, in particular a device temperature, a battery state and/or a connection status to an external device. 
     Thus, further functions for operation of the hand-held power tool can be set and visualized in a simple manner. 
     In addition, the present invention provides a method for aligning a hand-held power tool having an alignment apparatus, comprising the steps of:
         a) arranging the hand-held power tool on a workpiece surface to be machined,   b) selecting a desired machining angle by means of the control unit,   c) initiating adjustment of the alignment apparatus,   d) starting alignment of the hand-held power tool at the selected machining angle, wherein the at least one luminous element emits a first luminous color as long as the actual inclination angle of the hand-held power tool exceeds a predetermined threshold value, and   e) terminating the alignment of the hand-held power tool when the actual inclination angle of the hand-held power tool corresponds to the selected machining angle and the at least one luminous element emits a second luminous color.       

     The invention thus makes it possible to provide a method for aligning a hand-held power tool in which the alignment apparatus enables the hand-held power tool to be aligned in a simple and uncomplicated manner at a desired angle to the machining surface. 
     The at least one luminous element preferably emits a third luminous color when the alignment apparatus is being adjusted. 
     Adjustment can thus be visualized in a simple and uncomplicated manner. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The invention is explained in greater detail in the following description by means of exemplary embodiments illustrated in the drawings. In the drawings: 
         FIG.  1    shows a perspective view of a hand-held power tool having an alignment apparatus, to which a first and second luminous element are assigned, 
         FIG.  2    shows a perspective view of the hand-held power tool having the alignment apparatus of  FIG.  1    with an alternative arrangement of a luminous element, 
         FIG.  3    shows a plan view of a control element assigned to the alignment apparatus of  FIG.  1    and  FIG.  2   , 
         FIG.  4    shows a side view of the hand-held power tool of  FIG.  1    and  FIG.  2    during a first alignment step, 
         FIG.  5    shows a side view of the hand-held power tool of  FIG.  4    during a second alignment step, 
         FIG.  6    shows a side view of the hand-held power tool of  FIG.  5    when a set machining angle is reached, 
         FIG.  7    shows a side view of the hand-held power tool of  FIG.  1    with an alternative alignment apparatus during a first alignment step, 
         FIG.  8    shows a side view of the hand-held power tool of  FIG.  7    with an alternative alignment apparatus during a second alignment step, and 
         FIG.  9    shows a side view of the hand-held power tool of  FIG.  7    and  FIG.  8    when a set machining angle is reached. 
     
    
    
     DESCRIPTION OF THE EXEMPLARY EMBODIMENTS 
     In the figures, elements with the same or a comparable function are provided with identical reference signs and are described in detail only once. 
       FIG.  1    shows an exemplary hand-held power tool  100 , which has a housing  105 . The housing  105  preferably has a handle  115  which, by way of illustration, connects an upper side  117  and a base region  191  to one another. In this case, the upper side  117  is arranged on a side of the housing  105  which faces away from the handle  115 . 
     A drive unit  120 ,  180  having at least one drive motor  180  is preferably arranged in the housing  105 . The drive motor  180  is preferably designed as an electronically commutated motor. The drive motor  180  can preferably be switched on and off by means of a manual switch  195 . The manual switch  195  is preferably arranged on the handle  115 . 
     An optional transmission  120  is preferably assigned to the drive unit  120 ,  180 . The transmission  120  is preferably designed as a planetary transmission. A control element  122  is assigned to the transmission  120  for the purpose of shifting gears. 
     The drive unit  120 ,  180  is preferably designed to drive a tool holder  140 . By way of illustration, the tool holder  140  is constructed in the manner of a drill chuck, but can, for example, alternatively also form a tool attachment which is arranged detachably on the hand-held power tool  100 . 
     The tool holder  140  is preferably designed to hold an insertable tool ( 510  in  FIG.  5   ). By way of example, the tool holder  140  is designed to hold insertable tools ( 510  in  FIG.  5   ) with a round shank, a hex interface, an SDS and/or SDS plus interface. The tool holder  140  rotates about an axis of rotation  199  during operation. 
     Furthermore, an optional impact mechanism  150  is assigned to the drive unit  120 ,  180 . Like the transmission  120 , the impact mechanism  150  is assigned a control element  152 , by means of which an operating mode can be set. In this case, it is possible, for example, to set a screwing mode, drilling mode and/or impact mode. 
     According to one embodiment, the hand-held power tool  100  can be connected mechanically and electrically to a rechargeable battery pack  190  for a power supply which is independent of the mains, but can alternatively also be operated from the mains, for example. The rechargeable battery pack  190  is arranged on the base region  191 , in particular on a lower side of the base region  191  which faces away from the drive motor  180 . The rechargeable battery pack  190  is preferably arranged detachably on the base region  191  by means of a rechargeable battery pack interface. With the rechargeable battery pack  190 , the base region  191  preferably forms a stand of the hand-held power tool  100 . However, the rechargeable battery pack  190  can also be firmly integrated into the housing  105  of the hand-held power tool  100 . 
     An alignment apparatus  175  is preferably provided. By way of example, this has a control unit  160  and at least one luminous element  165 ,  170  arranged on the housing  105 . It is pointed out that the alignment apparatus  175  can have any desired number of luminous elements. 
     The alignment apparatus  175  is preferably assigned two luminous elements  165 ,  170 . The alignment apparatus  175  is designed to determine and visualize a current deviation between a selectable machining angle ( 310 ,  312 ,  314 ,  316  in  FIG.  3   ) and an actual inclination angle (a in  FIG.  6   ) of the hand-held power tool  100  in a working mode of the hand-held power tool  100 . In the context of the present invention, the working mode also includes alignment of the hand-held power tool  100 , during which the drive motor  180  is not activated. 
     To determine the actual inclination angle (a in  FIG.  6   ) of the hand-held power tool  100 , a sensor is preferably assigned to the hand-held power tool  100 . The sensor is preferably an acceleration sensor. The acceleration sensor preferably determines proportionally the gravitational acceleration in the three spatial directions, which are in each case aligned perpendicular to one another. The inclination angle (a in  FIG.  6   ) can be determined as a function of the proportions of the gravitational acceleration in the three spatial directions. 
     The selectable machining angle ( 310 ,  312 ,  314 ,  316  in  FIG.  3   ) can preferably be selected by means of the control unit  160 . The selectable machining angle ( 310 ,  312 ,  314 ,  316  in  FIG.  3   ) is formed between the insertable tool ( 510  in  FIG.  5   ), which can be arranged in the tool holder  140 , and a workpiece surface ( 410  in  FIG.  4   ) to be machined by means of the insertable tool. The inclination angle (a in  FIG.  6   ) is preferably formed between the insertable tool ( 510  in  FIG.  5   ), which can be arranged in the tool holder  140 , and the workpiece surface ( 410  in  FIG.  4   ) to be machined with the insertable tool. The alignment apparatus  175  preferably determines the current deviation between the set machining angle and the actual inclination angle in real time. In this case, the current deviation is preferably visualized by means of at least one, preferably two, luminous elements  165 ,  170 . 
     According to one embodiment, the at least one luminous element  165 ,  170  is designed at least to emit a first and a second luminous color ( 720  in  FIG.  7 ,  820    in  FIG.  8 ,  920    in  FIG.  9   ). The at least one luminous element  165 ,  170  preferably emits the first luminous color ( 820  in  FIG.  8   ) when the predetermined deviation exceeds a predetermined threshold value. Furthermore, the at least one luminous element  165 ,  170  preferably emits the second luminous color ( 920  in  FIG.  9   ) when the predetermined deviation is less than or equal to the predetermined threshold value. According to one embodiment, the first luminous color is yellow and the second luminous color is green. 
     The threshold value is preferably 3°, and therefore a maximum deviation of +/−3° from a set machining angle is possible with respect to the second luminous color. That is to say that, given a set machining angle of, for example, 30°, the at least one luminous element  165 ,  170  lights up in the second luminous color in an angular range of 27° to 33°. If the deviation is greater, i.e. the predetermined threshold value of 3° is exceeded, then the at least one luminous element  165 ,  170  lights up in the first luminous color. 
     According to one embodiment, analogously to this, the second luminous color can also be assigned a second threshold value, which is preferably 10°. That is to say that, in the example described above, given a set machining angle of 30°, the at least one luminous element  165 ,  170  lights up in the first luminous color in an angular range of 20° to 27° and of 33° to 40°. In this case, when the second threshold value is exceeded, the at least one luminous element  165 ,  170  can be switched off, for example. 
     It is pointed out that the threshold values mentioned are of a purely illustrative character and do not serve to restrict the invention. On the contrary, the first and second threshold values can also assume other values. 
     The at least one luminous element  170  is preferably arranged on the upper side  117  of the housing  105 . In this case, the upper side  117  is arranged, as described above, such that it faces away from the handle  115 . By way of illustration, the luminous element  170  is arranged at an end of the housing  105  or of the upper side  117  remote from the tool holder  140 . Along the axis of rotation  199  of the tool holder  140 , the luminous element  170  is arranged between the control element  122  of the transmission  120  and the end of the housing  105  remote from the tool holder  140 . 
     According to a further embodiment, the luminous element  170  can be arranged at an end of the housing  105  adjacent to the tool holder  140 , as shown in  FIG.  2   . Furthermore, a luminous element  170  can be arranged at an end of the housing  105  or of the upper side  117  remote from the tool holder  140  and at an end of the housing  105  adjacent to the tool holder  140 . 
     The control unit  160  preferably has at least one luminous element  165 . According to one embodiment, at least one angle value is stored in the control unit  160  and can be selected as the selectable machining angle ( 310 ,  312 ,  314 ,  316  in  FIG.  3   ). Machining angles of 30°, 60°, 90° are preferably stored. However, other or further additional machining angles can also be stored. Thus, for example, two preset machining angles of 45° and 60° and a freely selectable machining angle can be stored, or three preset machining angles of 30°, 60° and 90° and a freely selectable machining angle can be stored. Further combinations of preset and freely selectable machining angles are also conceivable. 
     Moreover, the control unit  160  can preferably be couplable to an external device. In this case, the selectable machining angle ( 310 ,  312 ,  314 ,  316  in  FIG.  3   ) can preferably be selected by means of the external device. The external device is preferably a PC, smartphone, etc., to which an application for selecting and setting at least one machining angle is assigned. 
     By way of illustration, the control unit  160  is arranged on an upper side  112 , facing the drive unit  120 ,  180 , of the base region  191  of the housing  105  of the hand-held power tool  100 . As an alternative to this, the control unit  160  can also be arranged on the upper side  117  or on an end side of the housing  105  which faces away from the tool holder  140 . Furthermore, the control unit  160  can also be arranged on one side of the housing  105 , perpendicular to the axis of rotation  199 , on the rechargeable battery pack  190 , or at any other desired point of the hand-held power tool  100 . 
     Working field lighting ( 330  in  FIG.  3   ) is preferably provided. The working field lighting ( 330  in  FIG.  3   ) is preferably assigned to the alignment apparatus  175 . In this case, the working field lighting ( 330  in  FIG.  3   ) preferably has the at least one luminous element  170 . 
     The control unit  160  preferably has the working field lighting ( 330  in  FIG.  3   ). In addition, the control unit  160  has at least one further display element ( 318  in  FIG.  3   ) for displaying further functions, in particular a device temperature, a battery state and/or a connection status to an external device. 
     By way of example, the hand-held power tool  100  is designed as a drill driver and, by way of illustration, has an optional impact mechanism  150 . However, the hand-held power tool  100  can also be designed as a hammer drill with the optional impact mechanism  150 . However, it is pointed out that the present invention is not restricted to drill drivers but can be used more generally in various hand-held power tools, with and without impact mechanisms, which have the alignment apparatus  175 . 
     When aligning the hand-held power tool  100  with the alignment apparatus  175 , the hand-held power tool  100  is preferably first arranged with a reference surface ( 420  in  FIG.  4   ) on a workpiece surface ( 410  in  FIG.  4   ) to be machined. A lower side, i.e. a side of the rechargeable battery pack  190  which is directed away from the handle  115 , preferably forms the reference surface ( 420  in  FIG.  4   ). It is pointed out that the reference surface ( 420  in  FIG.  4   ) can be any desired, preferably flat, surface of the hand-held power tool  100 , e.g. the lower side, the upper side  117 , an end face and/or a side perpendicular to the axis of rotation  199 . In addition, the hand-held power tool  100  can also have a plurality of reference surfaces ( 420  in  FIG.  4   ). 
     A desired machining angle ( 310 ,  312 ,  314 ,  316  in  FIG.  3   ) is then set by means of the control unit  160 . Adjustment of the alignment apparatus  175  is then initiated. According to one embodiment, the at least one luminous element  165 ,  170  emits a third luminous color ( 720  in  FIG.  7   ) when the alignment apparatus  175  is being adjusted. The at least one luminous element  165 ,  170  preferably flashes in the third luminous color during initiation. After this, the at least one luminous element  165 ,  170  goes out. The third luminous color is preferably blue, although green is also possible. 
     It is pointed out that the luminous colors described are of a purely illustrative character and are not to be regarded as a restriction of the present invention. Thus, the first, second and/or third luminous color may also be any other color. In addition, it is also possible for a user of the hand-held power tool  100  to set or select a desired luminous color. It is also pointed out that setting of a desired machining angle and initiation can take place simultaneously or successively. Furthermore, setting of a desired machining angle and initiation can be accomplished by means of a respectively assigned actuating element. A respective actuating element can be provided for this purpose. Furthermore, setting can also be accomplished by means of a combination of buttons. 
     Alignment of the hand-held power tool  100  now begins. The at least one luminous element  165 ,  170  emits the first luminous color ( 820  in  FIG.  8   ) as long as the actual inclination angle (a in  FIG.  6   ) of the hand-held power tool  100  exceeds a predetermined threshold value. As described above, this may be the case exclusively in an associated angular range. 
     If the actual inclination angle (a in  FIG.  6   ) of the hand-held power tool  100  corresponds to the selected machining angle ( 310 ,  312 ,  314 ,  316  in  FIG.  3   ) within a predetermined deviation, the alignment of the hand-held power tool  100  is terminated. This is visualized in that the at least one luminous element  165 ,  170  lights up in a second luminous color ( 920  in  FIG.  2   ). 
     According to one variant, visualization can also take place as a function of a flashing frequency. In this case, for example, the at least one luminous element  165 ,  170  can flash at different flashing frequencies instead of in different colors. During this process, by way of example, the at least one luminous element  165 ,  170  can be lit up continuously only when the set machining angle is reached. 
     In addition, a combination of different luminous colors and/or different flashing frequencies is also possible, e.g. fast and slow flashing in an associated color. Thus, for example, the at least one luminous element  165 ,  170  can flash in the first luminous color at a flashing frequency and can light up continuously in the second luminous color, etc. In addition, acoustic signaling can also take place. 
       FIG.  2    shows the hand-held power tool  100  with the alignment apparatus  175  of  FIG.  1   . According to a further embodiment, the at least one luminous element  170  arranged on the upper side  117  is arranged at an end of the housing  105  adjacent to the tool holder  140 . By way of illustration, the luminous element  170  is arranged between the tool holder  140  and the control element  152  of the impact mechanism  150  along the axis of rotation  199  of the tool holder  140 . 
       FIG.  3    shows the control unit  160  of the hand-held power tool  100  of  FIG.  1    and  FIG.  2   . By way of example, the control unit  160  has a control element  320  for selecting a machining angle. 
     At least one angle value is preferably stored in the control unit  160  and can be selected as the selectable machining angle  310 ,  312 ,  314 ,  316 . By way of illustration, a first machining angle  310  is assigned to a display field  322 , a second machining angle  312  is assigned to a display field  323  and a third machining angle  314  is assigned to a display field  324 . Preferably, the first machining angle is 30°, the second machining angle is 60° and the third machining angle is 90°. However, any other machining angles can also be stored. By pressing the control element  320  or a selected display field of the display fields  322 ,  323 ,  324 , one of the predetermined machining angles  310 ,  312 ,  314  can be selected. In this case, the respectively selected display field  322 ,  323 ,  324  preferably lights up. Thus, one of the predetermined machining angles  310 ,  312 ,  314  can be selected by actuating the control element  320 . With each actuation of the control element  320 , the machining angle  310 ,  312 ,  314  is changed step by step. After the machining angles  310 ,  312 ,  314  have been changed step by step, the machining angle  310 ,  312 ,  314  is reset. For example, in a first actuation of the control element  320 , machining angle  310  is set, in a second actuation of the control element  320 , a change is made from machining angle  310  to machining angle  312 , in a third actuation of the control element  320 , a change is made from machining angle  312  to machining angle  314 , and in a fourth actuation of the control element  320 , a change can be made from machining angle  314  to machining angle  310  or to a machining angle  316 , or the set machining angle  310 ,  312 ,  314 ,  316  can be reset. In addition, there is preferably a further display field  325 , it being possible for a desired machining angle  316  to be entered via an external device in a user mode. Here, the display field  325  preferably displays a selected mode and/or angle value. The desired machining angle  316  can be selected by actuating the control element  320 , as described above. For example, in a fifth actuation of the control element  320 , it is possible to change from the machining angle  316  to the machining angle  310  or to reset the set machining angle  310 ,  312 ,  314 ,  316 . 
     In the case where the control unit  160  is deactivated, actuation of the control element  320  first of all enables activation of the control unit  160 . As soon as the control element  320  is actuated again, the machining angle  310  is set, as described above. Each time one of the machining angles  310 ,  312 ,  314 ,  316  is set, the associated display field  322 ,  323 ,  324 ,  325  can flash, for example with a luminous color. It is also conceivable for at least one of the luminous elements  165 ,  170  to flash during this process. During the flashing of the display field  322 ,  323 ,  324 ,  325  or one of the luminous elements  165 ,  170 , the adjustment of the alignment apparatus  175  is initiated, as described above, in which the alignment apparatus  175  is aligned relative to the reference surface ( 420  in  FIG.  4   ), see also  FIGS.  4 - 6   . 
     It is conceivable, for example, that three machining angles  310 ,  312 ,  314  are provided, so that in a first actuation of the control element  320 , the machining angle  310  is set, in a second actuation of the control element  320 , a change is made from the machining angle  310  to the machining angle  312 , in a third actuation of the control element  320 , a change is made from the machining angle  312  to the machining angle  314 , and in a fourth actuation of the control element  320 , the set machining angle  310 ,  312 ,  314  is reset. 
     Furthermore, an optional control element  340 , by means of which further functions can be selected, is preferably provided. A display element  318  is assigned to the control element  340 . The at least one further display element  318  is designed to display the further functions. Here, the display element clarifies further functions, such as, for example, a device temperature, a battery state and/or a connection status to an external device. In this case, it is possible, for example, for a function to be assigned a symbol which is displayed. In addition, a luminous element can be assigned which lights up and/or flashes. 
     According to one embodiment, the control unit  160  is assigned working field lighting  330 , or is implemented by the latter. Alternatively, the working field lighting  330  can also be arranged at any other suitable point of the hand-held power tool  100 , e.g. on an end face of the hand-held power tool  100 . 
     Moreover, by way of illustration, the control unit  160  has the luminous element  165 . By way of example, the luminous element  165  is formed in the manner of a bar along a longitudinal side of the control unit  160 . As an alternative to this, the luminous element  165  can also be formed from a plurality of luminous elements. In this case, the luminous elements can be arranged side by side and/or one below the other. 
     According to a further embodiment, the display elements  322 ,  323 ,  324 ,  325 ,  318  can also each be designed as a control element by means of which a respectively stored machining angle  310 ,  312 ,  314 ,  316  or further functions can be selected directly. In addition, it is also possible for a machining angle to be set by means of a combination of buttons. Here, the display fields  322 ,  323 ,  324 ,  325 ,  318  can be actuated in such a way that, for example when display field  322  is actuated, machining angle  310  is set, when display field  323  is actuated, machining angle  312  is set, when display field  324  is actuated, machining angle  314  is set, and when display field  325  is actuated, machining angle  316  is set, and when display field  318  is actuated the further function is selected. 
     In an exemplary alignment method, a desired machining angle of the predetermined possible machining angles  310 ,  312 ,  314  is, by way of example, selected by pressing a selected display field of the display fields  322 ,  323 ,  324 . If a different machining angle is to be selected, this can be set by pressing the desired display field  322 ,  323 ,  324 . For example, by pressing display field  322 , machining angle  310  is set, by pressing display field  323 , machining angle  312  is set, and by pressing display field  324 , machining angle  314  is set. If, for example, the set machining angle  310 ,  312 ,  314 ,  316  is to be reset, the selected display field  322 ,  323 ,  324  can be actuated again. During selection, the at least one luminous element  165 ,  170  is preferably switched off. During subsequent initiation of the selected machining angle  310 ,  312 ,  314 , the at least one luminous element  165 ,  170  preferably flashes in the third luminous color. After this, the at least one luminous element  165 ,  170  goes out. During alignment, the display element  322 ,  323 ,  324  of the selected machining angle  310 ,  312 ,  314  preferably lights up continuously. In addition, the at least one luminous element  165 ,  170  lights up in the first or second luminous color, depending on the orientation or depending on the deviation from the set machining angle. 
       FIG.  4    shows the hand-held power tool  100  of  FIG.  1    and  FIG.  2    during a first alignment step. In this case, as described above, the hand-held power tool  100  is arranged with its reference surface  420  on the workpiece surface  410  to be machined. By way of illustration, a side of the rechargeable battery pack  190  which is arranged facing away from the handle  115  is designed as the reference surface  420 . In  FIG.  3   , a desired machining angle  310 ,  312 ,  314 ,  316  is selected and initiated by means of the control unit  160  and/or an external device. 
       FIG.  5    shows the hand-held power tool  100  of  FIG.  4    with an insertable tool  510 . The insertable tool  510  is preferably a drill, screwdriver bit and/or chisel. 
       FIG.  6    shows the hand-held power tool  100  of  FIG.  4    and  FIG.  5   , the hand-held power tool  100  being arranged at an inclination angle a to the workpiece surface  410 . In particular, the reference surface  420  of the hand-held power tool is arranged at an inclination angle a with respect to the workpiece surface  410 . The above-described sensor assigned to the hand-held power tool  100  preferably detects an angle to the axis of rotation  199  of  FIG.  1    or to the insertable tool  510 . 
       FIG.  7    shows the hand-held power tool  100  of  FIG.  1    and  FIG.  2    with the alignment apparatus  175 . According to a further embodiment, the working field lighting  330  is assigned to the alignment apparatus  175 . In this case, the working field lighting  330  preferably has the at least one luminous element  170 . As a particular preference, the working field lighting  330  is formed by the at least one luminous element  170 . 
     By way of illustration, the working field lighting  330  in  FIG.  7    lights up in a third luminous color  720 . As described above, the third luminous color  720  is assigned to the initiation of a machining angle. 
       FIG.  8    shows the hand-held power tool  100  of  FIG.  7   , wherein the working field lighting  330  lights up in a first luminous color  820 . As described above, the first luminous color  820  is emitted when the predetermined deviation exceeds the predetermined threshold value. 
       FIG.  9    shows the hand-held power tool  100  of  FIG.  7    and  FIG.  8   , wherein the working field lighting  330  lights up in a second luminous color  920 . As described above, the second luminous color  920  is emitted when the predetermined deviation is less than or equal to the predetermined threshold value. 
     It is pointed out that, in the embodiment shown in  FIG.  7    to  FIG.  9   , the luminous element  165  of the control unit  160  additionally lights up in the respective luminous color. However, only the working field lighting  330  may be lit up. Moreover, luminous element  170  can additionally light up on the upper side  117 . Furthermore, the working field lighting  330  can also flash at different flashing frequencies instead of the luminous colors. Furthermore, a combination of luminous colors and flashing frequencies, as described above, can be assigned to the working field lighting.