Power tool device and method

Abstract

The present invention relates to a power tool apparatus (10), in particular a driver apparatus and / or a drill apparatus, comprising a drive unit (1) for rotationally driving a tool (2), in particular a drill bit or driver blade, wherein the power tool apparatus (10) is configured to obtain at least one drive value (AG) during rotational driving of the tool (2), the drive value (AG) being a torque acting on the tool (2) and / or a drive value related to said torque, for example an electrical drive value of the drive unit (1), and the power tool apparatus (10) is configured to determine a change criterion based on the at least one drive value (AG) during rotational driving of the tool (2), and to change the rotational driving of the tool (2) in response to the obtained drive value (AG) satisfying the change criterion.

Description

[Technical Field]

[0001] The present invention relates to a power tool device, in particular a driver device and / or a drill device, comprising a drive unit for driving a tool, in particular a drill bit or a driver blade, in rotation. The power tool device is configured to obtain at least one drive value during the rotation of the tool, the drive value being a torque acting on the tool and / or a drive value related to said torque, for example an electrical drive value of the drive unit. [Background technology]

[0002] In conventional power tool devices, such as conventional battery-powered screwdrivers, a user can set a torque limit to limit the torque acting on the tool. By selecting the correct value for the torque limit, the user can ensure that the work process performed by the power tool device, such as a screwing process and / or a drilling process, is stopped at a desired work state. For the process of driving a screw into a workpiece, it is usually desirable to set a drive torque limit on the screw head's driving moment, so that the screwing process stops when the screw head reaches or is flush with the surface of the workpiece.

[0003] U.S. Patent No. 8,919,456 describes a method for controlling the operation of a power tool. The current supplied to an electric motor of the power tool is periodically measured. A linear regression is used to determine the slope of a series of current measurements. The transmission of torque to an output shaft is interrupted based at least in part on the series of current measurements. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] U.S. Patent No. 8,919,456 Summary of the Invention [Problem to be solved by the invention]

[0005] SUMMARY OF THE INVENTION An object of the present invention is to enable a user to easily obtain desired results when working with a power tool device. [Means for solving the problem]

[0006] This problem is solved by a power tool device according to claim 1. The power tool device is configured to determine a modification criterion based on at least one acquired drive value during rotational driving of the tool, and to modify the rotational driving of the tool in response to the acquired drive value satisfying the modification criterion.

[0007] To achieve a desired result, during a work process using a power tool device, it is necessary to change the rotational drive of the tool, for example, to lower, terminate, and / or pulse operation, at an appropriate time. The work process is, in particular, a screwing or drilling process. For example, in a screwing process, it is usually necessary to change the rotational drive, for example, to lower, terminate, and / or pulse operation, at an appropriate time so that the screw driven by the tool does not further screw into the workpiece. The appropriate time is defined as when the upper surface of the screw head has a desired position relative to the surface of the workpiece, for example, when the upper surface of the screw head is flush with the surface of the workpiece.

[0008] In the conventional power tool devices mentioned at the beginning, the user must know in advance which torque limit must be set for each work step in order to achieve the desired result. Which torque limit will achieve the desired result depends, for example, on the workpiece, in particular its material, the tool and / or the screw to be screwed in. If the user makes an error in selecting the torque limit, the work step may not be stopped at the correct time, which may result in the desired result, for example, not achieving the desired screw-in depth.

[0009] As described above, in this power tool device, the change criterion (based on which the rotational drive is changed) is determined during the rotational drive, i.e., during the current work process, for example, during the current screwing process. This ensures that an appropriate change criterion is selected for the current work process, for example, for the current workpiece, the current tool, and / or the screw to be currently screwed. Since the drive values ​​obtained during the rotational drive depend on the workpiece, the tool, and / or the screw, the change criterion appropriate for the current work process can be determined based on the obtained drive values. As a result, an appropriate change criterion can be automatically determined by the power tool device, which allows the user to easily obtain desired results when working with the power tool device.

[0010] Preferably, the change criterion includes a change threshold, for example, the drive value meets the change criterion when the slope of the drive value reaches the change threshold.

[0011] According to a preferred embodiment, the power tool device is Ingredients During rotational driving, the power tool is configured to calculate a gradient value of the acquired drive value, calculate a change threshold value based on the gradient value, for example by multiplying it by a coefficient, and continuously compare the current gradient of the drive value with the change threshold value. Preferably, the power tool performs the work in response to the result of the comparison that the current gradient has reached the change threshold value. Ingredients The power tool is configured to change the rotary drive, for example, to terminate, reduce, or pulse the rotary drive. The power tool is particularly configured to newly calculate a unique change threshold value for each working process, in particular for each screwing process, for example for each rotary drive. Preferably, the power tool determines the change threshold value only once for each working process, for example for each screwing process, in particular based on a single slope value that is preferably determined during the working process. The power tool is particularly configured to perform a comparison with the current slope only after the change threshold value has been determined. The power tool is preferably configured to newly determine the change threshold value for each screwing process individually, i.e., for each screwing process.

[0012] Preferably, the calculation of the modification criterion, in particular the modification threshold, is performed on the basis of the obtained drive value or values.

[0013] Advantageous developments are the subject of the dependent claims.

[0014] The present invention further relates to a method for operating a power tool device, in particular a driver device and / or a drill device, having a drive unit for rotationally driving a tool, in particular a drill bit or driver blade, the method comprising the steps of: starting the rotational driving of the tool; detecting at least one drive value during the rotational driving of the tool, the drive value being a torque acting on the tool and / or a drive value related to said torque, for example an electrical drive value of the drive unit; determining a modification criterion based on the at least one drive value obtained during the rotational driving of the tool; and modifying the rotational drive in response to the obtained drive value satisfying the modification criterion.

[0015] Advantageously, the method is implemented using the power tool device described and / or is adapted to correspond to developments of the power tool device.

[0016] Further exemplary details and example embodiments are described below with reference to the drawings. [Brief explanation of the drawings]

[0017] [Figure 1] 1 shows a schematic diagram of a power tool device. [Figure 2] The drive value and the slope of the drive value over time are shown. [Figure 3] 1 shows a workpiece and three screws threaded into it in different threading modes. [Figure 4] 1 shows a power tool device having an attachment. [Figure 5] 1 shows a power tool device together with a mobile device. [Figure 6] 1 shows a flowchart of a method for operating a power tool device. DETAILED DESCRIPTION OF THE INVENTION

[0018] 1 shows a power tool device 10. The power tool device 10 is illustratively configured as a driver device and / or a drill device.

[0019] The power tool device 10 includes a drive device 6 and, illustratively, a tool 2 attached to the drive device 6. The drive device 6 is configured as a handheld device. The drive device 6 is, for example, a drill driver, particularly a battery-powered drill driver. Illustratively, the drive device 6 is configured in a T-shape. Alternatively, the drive device may be configured in a pistol-like shape.

[0020] The drive device 6 has a grip portion 14, which the user can hold in his / her hand to carry and guide the drive device 6. The grip portion 14 has its longitudinal axis advantageously oriented vertically.

[0021] The drive device 6 further comprises a shank portion 15, at the front end of which the tool 2 is arranged. The shaft 9 preferably extends through the shank portion 15. The shank portion 15 is oriented with its longitudinal axis, which is illustratively horizontal.

[0022] The drive device 6 further comprises an energy accumulator part 16. The energy accumulator part 16 is arranged, for example, below the grip part 14. The energy accumulator part 16 comprises an energy accumulator 17, for example a battery.

[0023] The power tool device 10 has a drive unit 1 that rotates a tool 2. The drive unit 1 has, for example, an electric motor that rotates the tool 2. The tool 2 is, for example, a screwdriver blade. Alternatively, the tool 2 may be a drill. The power tool device 10 has, for example, a shaft 9 via which the tool 2 is coupled to the drive unit 1, in particular the electric motor, so that the tool 2 can be rotated via the shaft 9 by the drive unit 1.

[0024] The power tool device 10, in particular the drive device 6, has an operating device 18, which exemplarily has a first operating element 21 and / or optionally a second operating element 22. The operating device 18, in particular the first operating element 21, is advantageously used to control, in particular start and / or stop, the rotary drive of the tool 2 provided by the drive unit 1. The first operating element 21 is preferably configured as a trigger button and is advantageously arranged on the grip portion 14. The optionally provided second operating element 22 is advantageously configured as a rotary switch. The second operating element 22 is used, for example, to select one of a number of screwing modes, which will be further described below.

[0025] The power tool device 10 comprises a control unit 19, which may comprise, for example, a microcontroller. The control unit 19 is used in particular to acquire user inputs entered by the operating device 18, in particular by the first operating element 21 and / or the second operating element 22. The control unit 19 is configured to control the drive unit 1, which thus provides the rotary drive for the tool 2. The control unit 19 is configured in particular to control the drive unit 1 taking into account the acquired user inputs.

[0026] The drive device 6 has an outer housing 12 in which, exemplarily, a control unit 19 and a drive unit 1 are arranged. A grip portion 14 is exemplarily part of the outer housing 12.

[0027] The power tool device 10, in particular the drive device 6, is configured to acquire at least one drive value AG during the rotational driving of the tool 2. The acquisition of the drive value AG is performed by the control unit 19, for example.

[0028] 2 shows an exemplary time course 3 of a drive value AG and a time course 23 of the slope of the drive value AG obtained during a screwing process. The drive value AG is a drive value related to torque. In particular, the drive value AG is a value that correlates with the torque acting on the tool 2. For example, the drive value AG is an electrical drive value of the drive unit 1. In particular, the drive value AG is the current supplied to the drive unit 1. For example, the drive value AG is the motor current. Furthermore, the drive value AG may be the torque acting on the tool 2.

[0029] The power tool 10 is configured to acquire a time course 3 of the drive value AG. For example, the power tool 10 is configured to acquire the drive value AG multiple times, in particular periodically, so that the time course of the drive value AG is recorded. The time course 3 includes multiple successively acquired values ​​of the drive value AG. The time course 3 may also be referred to as a drive value curve or a drive value characteristic curve. The acquisition of the drive value AG is, for example, performed by the control unit 19.

[0030] The power tool 10 is configured to calculate the slope based on the time lapse 3. For example, the power tool 10 is configured to calculate the time derivative dAG / dt of the drive value AG, thereby obtaining the slope. The calculation of the slope is performed, for example, by the control unit 19.

[0031] The time course 3 shown in FIG. 2 may occur during a screwing process performed by the power tool device 10. The screwing process begins at a first time point t1. At the first time point t1, for example, a user activates the rotational drive of the tool 2 by actuating the first operating element 21. At this point, the tool 2 engages the head of a screw to be screwed into a workpiece, e.g., a workpiece. During a first time range from the first time point t1 to a second time point t2, the drive value AG increases with a first slope ST1, advantageously within a first slope range. This first time range may be referred to as a first slope section 31. During the first slope section 31, the screw penetrates the material of the workpiece and forms a crack in the material. Exemplarily, during the first slope section 31, the torque acting on the tool 2, and in particular the drive value AG, which is correlated with the torque, continuously increases. The first slope section 31 has an approximately linear slope. By way of example only, the slope in the first slope section 31 is constant.

[0032] The first time range is followed by a second time range from a second time point t2 to a third time point t3. The second time range may be referred to as a second slope section 32. During the second time range, the drive value AG increases with a second slope ST2, advantageously within the second slope range. The second slope ST2 is illustratively smaller than the first slope ST1. In particular, the second slope range is lower than the first slope range. For example, the average slope of the second slope range is smaller than the average slope of the first slope range. During the second slope section 32, the screw is driven with its thread into the workpiece. Exemplarily, during the second slope section 32, the torque acting on the tool 2, and in particular the drive value AG, which is correlated with the torque, continuously increases. The second slope section 32 has an approximately linear slope. By way of example only, the slope during the second slope section 32 is constant.

[0033] The first time range and the second time range together form a first progression section 4. The first progression section 4 extends from a first time point t1 to a third time point t3.

[0034] The second time range is followed by a third time range from a third time point t3 to a fourth time point t4. The third time range may be referred to as a third slope section 33. During the third time range, the drive value AG increases with a third slope ST3, advantageously within the third slope range. The third slope ST3 is illustratively greater than the first slope ST1. In particular, the third slope range is higher than the first slope range. For example, the average slope of the third slope range is greater than the average slope of the first slope range. During the third slope section 33, the screw head penetrates the material of the workpiece. Illustratively, during the third slope section 32, the torque acting on the tool 2, and in particular the drive value AG, which is correlated with the torque, continuously increases. The third slope section 33 has an approximately linear slope. By way of example only, the slope during the third slope section 33 is constant.

[0035] Exemplarily, the drive value AG does not increase any further after the third time range and then decreases, for example because the rotational drive of the tool 2 has ended.

[0036] The third time range forms a second section 5 which extends from a third time point t3 to a fourth time point t4. The second section 5 follows the first section 4 in time.

[0037] The power tool device 10, in particular the control unit 19, is configured to determine a change criterion based on at least one acquired drive value AG during rotational driving of the tool 2, and to change the rotational driving of the tool 2 in response to the acquired drive value AG satisfying the change criterion.

[0038] Preferably, the power tool device 10, in particular the control unit 19, is configured to determine a change criterion for each work step, in particular for each screwing and / or drilling step, individually. In particular, a unique change criterion is determined for each work step. The change criterion is advantageously used in this work step, in particular only in this work step. Advantageously, each change criterion is used only for the respective work step for which the change criterion was determined. For each new work step, a new change criterion is determined and used appropriately.

[0039] The term "working process" refers in particular to a screwing process or a drilling process. Each working process begins, for example, with the initiation of the rotational drive of the tool 2 and / or a user operation of the first control element 21. The respective working process advantageously continues as long as the drive unit 1 provides the rotational drive of the tool 2 and / or the first operating element 21 remains activated. Advantageously, the respective working process continues until a further initiation of the rotational drive of the tool 2 (after the rotational drive of the tool 2 has been stopped) and / or a further user operation of the first operating element 21 (after the user operation of the first operating element 21 has been stopped). The further initiation and / or the further user operation initiates a new working process. The previous working process ends at the latest with the start of the new working process. A working process can continue in particular as long as there is a continuous rotational drive of the tool 2 and / or a continuous user operation of the first control element 21, and preferably ends with the end of the continuous rotational drive and / or the continuous user operation. Advantageously, a minimum period that must elapse before the end of a working process is valid can be set in the power tool device 10. Optionally, the user can input via the operating device 18 that the current work process is finished.

[0040] Preferably, the modification criterion has a modification threshold WSW, and the obtained drive value AG satisfies the modification criterion when the slope of the obtained drive value AG reaches the modification threshold WSW, which is exemplarily greater than the first slope ST1 and / or less than the third slope ST3.

[0041] Accordingly, the power tool device 10, in particular the control unit 19, is preferably configured to determine a modification threshold value WSW based on at least one acquired drive value AG during rotational driving of the tool 2, and to modify the rotational driving of the tool 2 in response to a current slope of the acquired drive value AG reaching the modification threshold value WSW. Preferably, the power tool device 10, in particular the control unit 19, is configured to determine a modification threshold value WSW individually for each work process, in particular for each screwing process and / or each drilling process. In particular, a unique modification threshold value WSW is determined for each work process. Advantageously, each modification threshold value WSW is used only for the respective work process for which the modification threshold value WSW was determined. For each new work process, a new modification threshold value WSW is determined and used appropriately.

[0042] Advantageously, the power tool device 10, in particular the drive device 6, preferably the control unit 19, is configured to determine the change criterion based on the slope, in particular the slope value, of the acquired drive value AG. The slope value may be, for example, the average slope. Furthermore, the slope value may be the maximum slope.

[0043] For example, the power tool device 10 is configured such that the modification criterion determines a modification threshold WSW based on the slope, in particular the slope value, the drive value AG and a coefficient, in particular by multiplication, and modifies the rotary drive of the tool 2 when the current slope of the obtained drive value AG reaches the modification threshold WSW. The modification threshold WSW is therefore advantageously the product of the slope, in particular the slope value, the drive value and the coefficient.

[0044] Preferably, the power tool 10, in particular the control unit 19, is configured to determine the modification criterion, in particular the modification threshold WSW, based on the slope, in particular the slope value, of the first slope section 31, in particular the first slope section 31, preferably exclusively. The power tool 10 determines the modification threshold WSW, in particular based on the calculated slope value of the first slope section 31. The slope value is, for example, the average slope of the first slope section 31. Furthermore, the slope value may be the maximum slope of the first slope section 31. Advantageously, the slope value is based exclusively on the slope of the first slope section 31, in particular not based on the slope of the second slope section 32 and / or the third slope section 33.

[0045] Exemplarily, the power tool 10 is configured to detect the end of the first slope interval 31, for example, based on the slope of the time course 3. For example, the power tool 10 is configured to continuously calculate the slope of the time course 3 and detect the end of the first slope interval 31 based on the continuously calculated slope, for example, based on a decrease in the continuously calculated slope. Advantageously, the power tool 10 is configured to calculate a slope value (based on the slope value, the power tool 10 calculates the change criterion, in particular the change threshold WSE) and / or a change criterion, in particular the change threshold WSW, in response to the power tool 10 detecting the end of the first slope interval 31. Advantageously, the power tool 10 calculates the slope value only after the slope interval 31 has ended. For example, the power tool 10 calculates the slope value (based on the slope value, the power tool 10 calculates the change criterion) as the average slope or maximum slope of the first slope interval 31.

[0046] Advantageously, the power tool device 10, preferably the control unit 19, is configured to modify the rotational drive of the tool 2 in response to the slope of the second path section 5 fulfilling a modification criterion, exemplarily when the slope of the second path section 5 reaches a modification threshold WSW.

[0047] Preferably, the power tool device 10 is configured to reduce, terminate and / or change the rotary drive of the tool 2 to a pulsed operation in response to the acquired drive value AG fulfilling a change criterion. The change in the rotary drive of the tool 2 is in particular such that the screw driven by the tool 2 is not further screwed into the workpiece. The change in the rotary drive of the tool 2 is advantageously effected by the control unit 19 changing the control of the drive unit 1, for example by reducing the motor current of the drive unit 1.

[0048] For example, when the rotary drive is changed, the torque acting on the tool 2 is reduced, for example to zero or to a value greater than zero. to Between torque pulses, the torque acting on the tool 2 may drop to zero.

[0049] If the change in the rotary drive consists in shutting off the rotary drive, the change criterion may be referred to as a shut-off criterion, and the change threshold may be referred to as a shut-off threshold.

[0050] Preferably, the power tool device 10 has a plurality of different screwing modes, and a screwing mode can be selected by the user from the plurality of available screwing modes, advantageously by means of the operating device, in particular by means of the second operating element 22. For example, the second operating element 22 can be moved into a plurality of different positions, in particular rotational positions, with different screwing modes being assigned to the different positions.

[0051] The power tool 10 is configured to determine the modification criterion, particularly the modification threshold value WSW, taking into account the selected screwing mode. For example, each screwing mode is assigned a respective coefficient used in calculating the modification threshold value WSW. Illustratively, the power tool 10 is configured to determine a coefficient (based on which the modification threshold value WSW is calculated) according to the selected screwing mode, i.e., a coefficient to be multiplied by the slope value of the time course 3 to calculate the modification threshold value WSW.

[0052] Three exemplary screwing modes will now be described with reference to FIG.

[0053] FIG. 3 shows a workpiece 34 and three screws 35, 36, 37 that have been screwed in with different screwing modes.

[0054] The power tool device 10 exemplarily has a first screwing mode. The first screwing mode is used to screw a first screw 35 into a workpiece 34. The first screwing mode is used to screw the screw so that the upper surface 38 of the head 39 of the screw is flush with the surface 41 of the workpiece 34 at the end of the work process. In the first screwing mode, when the upper surface 38 of the head 39 of the screw 35 is flush with the surface 41 of the workpiece 34, the rotational drive of the tool 2 is modified, in particular, reduced, terminated, and / or pulsed. In particular, the power tool device 10 is configured to select the modification threshold WSW such that the slope of the time course 3 reaches the modification threshold WSW when the upper surface 38 of the head 39 of the screw 35 is flush with the surface 41 of the workpiece 34 in the first screwing mode. Advantageously, in the first screwing mode, the power tool device 10 uses a first coefficient to calculate the modification threshold value WSW, which is selected so that the slope of the time course 3 reaches the modification threshold value WSW when the screw 35 is flush with the upper surface 38 of its head 39 on the surface 41 of the workpiece 34. The first coefficient is advantageously predetermined and / or stored in the power tool device 10 in advance, i.e., before the execution of the respective work step. The first coefficient is determined, for example, empirically.

[0055] The power tool device 10 exemplarily has a second screwing mode. The second screwing mode is used to screw a second screw 36 into the workpiece 34. The second screwing mode is used to screw a screw such that, at the end of the work process, the screw protrudes with the upper surface 38 of its head 39 from the surface 41 of the workpiece 34. In the second screwing mode, when the screw 36 protrudes with the upper surface 38 of its head 39 from the surface 41, the rotational drive of the tool 2 is modified, in particular, reduced, terminated, and / or pulsed. In particular, the power tool device 10 is configured to select the modification threshold value WSW in the second screwing mode such that the slope of the time course 3 reaches the modification threshold value WSW when the screw 36 protrudes with the upper surface 38 of its head 39 from the surface 41, preferably when the screw head 39 is partially inserted into the workpiece 34. Advantageously, in the second screwing mode, the power tool device 10 uses a second coefficient to calculate the modification threshold value WSW. The second coefficient is selected so that the slope of the time course 3 reaches the modification threshold value WSW when the screw 35 protrudes with the upper surface 38 of its head 39 from the surface 41, preferably when the head 39 is partially inserted into the workpiece 34. The second coefficient is preferably predetermined and / or stored in the power tool device 10 in advance, i.e., before the execution of the respective work step. The second coefficient is determined, for example, based on experience. The second coefficient is illustratively smaller than the first coefficient. In the second screwing mode, the modification threshold value WSW is illustratively smaller than the modification threshold value WSW in the first screwing mode.

[0056] The power tool device 10 exemplarily has a third screwing mode. The third screwing mode is used to screw a third screw 37 into the workpiece 34. The third screwing mode is used to screw a screw so that, at the end of the work process, the screw sinks with the upper surface 38 of its head 39 below the surface 41. In the third screwing mode, when the screw 37 sinks with the upper surface 38 of its head 39 below the surface 41, the rotational drive of the tool 2 is modified, in particular, reduced, terminated, and / or pulsed. In particular, the power tool device 10 is configured to select the modification threshold WSW such that, in the third screwing mode, the slope of the time course 3 reaches the modification threshold WSW when the screw 37 sinks with the upper surface 38 of its head 39 below the surface 41. Advantageously, in the third screwing mode, the power tool device 10 uses a third coefficient to calculate the modification threshold value WSW. The third coefficient is selected so that the slope of the time course 3 reaches the modification threshold value WSW when the screw 35 sinks with the upper surface 38 of its head 39 below the surface 41. The third coefficient is advantageously predetermined and / or stored in the power tool device 10 in advance, i.e., before the execution of each work step. The third coefficient is determined, for example, based on experience. The third coefficient is illustratively greater than the first coefficient. In the third screwing mode, the modification threshold value WSW is illustratively greater than the modification threshold value WSW in the first screwing mode.

[0057] Preferably, the coefficients, in particular the first coefficient, the second coefficient and / or the third coefficient and / or the modification threshold WSW, can be adjusted by the user, for example by means of the operating device 18, and / or are set to be fixed.

[0058] Optionally, the screwing mode can be selected, in particular by the user, via a device provided additionally to the drive device 6, for example an IoT device, i.e. an Internet of Things device.

[0059] As described above, the power tool 10 multiplies the slope value of the time lapse 3 by a coefficient to calculate the modification threshold value WSW. Preferably, the power tool 10 adapts the coefficient depending on the selected screwing mode. The power tool 10 compares the modification threshold value WSW with the subsequent slope of the time lapse 3, and when the subsequent slope reaches the modification threshold value WSW, the power tool 10 modifies the rotational drive of the tool 2, in particular, so that the screw is not further screwed in.

[0060] Preferably, the modification criterion, the modification threshold WSW and / or the coefficient can be set by the user, for example, the modification criterion, the modification threshold WSW and / or the coefficient can be input via the operating device 18, in particular via the second operating element 22. For example, the modification criterion, the modification threshold WSW and / or the coefficient can be set fixedly or can be set by the user.

[0061] Optionally, the modification criteria, modification thresholds WSW and / or coefficients can be entered, in particular by a user, via a device provided additionally to the actuation device 6, for example an IoT device, ie an Internet of Things device.

[0062] Preferably, the power tool 10 is further configured to take previous work steps, in particular screwing and / or drilling steps, into account when determining the change criterion. For example, the power tool 10 is configured to acquire and store work data for each work step and use this work data when determining the change criterion, in particular the change threshold value, preferably a coefficient, for a subsequent work step. The work data includes, for example, the acquired drive value AG, in particular the time course 3. The work data may also include information about corrective operations, in particular of the first operating element 21, performed by the user, for example after changing the rotary drive.

[0063] For example, the power tool device 10 is configured to know that the user has operated the first operating element 21 to further drive the screw into the workpiece after the change in the rotational drive that is made in response to the fulfillment of the change criterion. handThe power tool 10 is advantageously configured to provide correction information as work data based on this knowledge and to adapt the calculation of the modification threshold value WSW for the subsequent work process based on the correction information, so that the modification threshold value WSW is selected to be greater than the modification threshold value WSW that would be selected in the absence of the correction information.

[0064] Advantageously, the power tool device 10 has an AI component, for example an artificial neural network, and is configured to calculate the modification criteria, in particular the modification thresholds, preferably the coefficients, using the AI ​​component, for example taking into account work data, in particular from previous work processes.

[0065] As mentioned above, the drive value AG is in particular an electrical value, for example the motor current of the electric motor of the drive unit 1. Alternatively or additionally, the acquired torque may be used as the drive value AG. Optionally, the power tool device 10 has a sensor device 11 arranged at the point of application of the torque, in particular at the shaft 9, in order to directly acquire the torque that may be used as the drive value AG. The sensor device 11 may, for example, comprise a strain gauge, a sensor for measuring mechanical stress, a magnetostrictive unit for detecting mechanical deformations, and / or a piezoelectric sensor unit. The sensor device 11 is configured to acquire the torque at the shaft 9, in particular the drive shaft, the output shaft, and / or the motor shaft. Furthermore, the sensor device 11 may be part of the attachment 7, which will be described later.

[0066] Optionally, the power tool device 10 is configured to recognize, based on the acquired drive value AG, in particular based on a time course of the drive value AG, that the tool 2 or a screw driven by the tool has come into contact with an unwanted obstacle, for example, an electric wire, and to modify the rotary drive, in particular to terminate, reduce, and / or pulse operation, based on this recognition. For example, obstacle characteristics are stored in the power tool device 10, and the power tool device 10 is configured to compare the acquired time course 3 of the drive value AG with the obstacle characteristics, and to modify the rotary drive based on the comparison, for example when the time course 3 corresponds to the obstacle characteristics.

[0067] FIG. 4 shows an exemplary configuration of the power tool device 10. In this configuration, the power tool device 10 includes an attachment 7. The attachment 7 is removably attached to the drive device 6, illustratively at the shank portion 15 thereof. The attachment 7 is communicatively connected to the drive device 6. The attachment 7 may be configured, for example, as an auxiliary grip. Advantageously, the attachment 7 is not required for providing the rotational drive of the tool 2 by the drive unit 1. The attachment 7 is preferably configured to acquire the drive value AG, calculate modification criteria, in particular modification thresholds WSW and / or coefficients, and / or check whether the acquired drive value AG satisfies the modification criteria, for example, whether the slope of the drive value AG reaches the modification threshold. Preferably, the attachment 7 includes an attachment sensor unit and / or an attachment control unit for acquiring the drive value AG. The attachment control unit is advantageously communicatively connected to the control unit 19, in particular wirelessly, for example via Bluetooth, and / or by wire. The attachment 7 may further provide part of the operating device 18, in particular the second operating element.

[0068] FIG. 5 shows an exemplary configuration of the power tool 10. In this configuration, the power tool 10 includes a mobile device 8, such as a smartphone, communicatively connected to the drive device 6, particularly a control unit 19, in particular via a wired and / or wireless connection, for example via Bluetooth. The mobile device 8 is provided separately from the drive device 6. The mobile device 8 is preferably configured to obtain the drive value AG, calculate modification criteria, in particular a modification threshold WSW and / or coefficients, and / or check whether the obtained drive value AG satisfies the modification criteria, for example, whether the slope of the drive value AG reaches the modification threshold. Preferably, the mobile device 8 includes a mobile device sensor unit and / or a mobile device control unit for detecting the drive value AG. The mobile device control unit is advantageously communicatively connected to the control unit 19, in particular via a wired and / or wireless connection. The mobile device 8 may further be part of the operating device 18 and may in particular provide a second control element. By way of example, the mobile device 8 has a touch screen 42 which forms part of the operating device 18 and which constitutes, for example, a second operating element.

[0069] 6 shows a flowchart of a method for operating the power tool device 10. The method includes a first step S1 in which rotational drive of the tool 2 is initiated. For example, in the first step, a user operates the operating device 18, in particular the first operating element 21, so that the drive unit 1 begins to provide rotational drive for the tool 2. Illustratively, at this point, the tool 2 engages with the head of a first screw to be screwed into a workpiece.

[0070] The method includes a second step S2 in which, during the rotational driving of the tool 2, at least one drive value AG is acquired, where the drive value AG is a torque acting on the tool 2 and / or a drive value AG related to this torque, e.g., an electrical drive value of the drive unit 1. For example, the power tool device 10 sequentially acquires multiple values ​​of the drive value AG and thus, in particular, records the time course 3 of the drive value AG. The acquisition of the drive value AG advantageously continues during a third step S3 and / or a fourth step S4. During the second step S2, a first screw is screwed into the workpiece.

[0071] The method further includes a third step in which, during rotational driving of the tool 2, a change criterion is determined based on the acquired at least one drive value AG. For example, the power tool 10 determines a slope value in the first slope interval 31, where the slope value is, for example, an average slope or a maximum slope in the first slope interval 31. The power tool 10 multiplies the slope value by a coefficient, thereby calculating a change threshold value WSW as the change criterion value. During the third step, the first screw is screwed into the workpiece.

[0072] The method further includes a fourth step S4, in which the rotary drive is modified in response to the obtained drive value AG satisfying a modification criterion. For example, the power tool device 10 continuously checks whether the current slope of the drive value AG reaches the modification threshold WSW, i.e., for example, is greater than or equal to the modification threshold WSW. If the current slope reaches the modification threshold WSW, the power tool device 10 determines that the modification criterion is satisfied and modifies the rotary drive provided by the drive unit 1 of the tool 2, in particular, to prevent the first screw from being further screwed into the workpiece. For example, the power tool device 10 terminates or reduces the rotary drive, or modifies it to pulsed operation.

[0073] The above-mentioned steps S1 to S4 exemplarily constitute a first working process, in particular a first screwing process. The first working process starts with step S1 and ends with step S4. Optionally, the first working process may include a further step after step S4 in which the user performs a corrective operation of the first operating element 21 in order to further screw the first screw into the workpiece, in particular within a predetermined period of time.

[0074] Optionally, the method includes a further step of performing a second work process, in particular a second screwing process, after the first work process by the power tool device 10, in which a second screw is screwed in. In the second work process, steps S1 to S4 and optionally S5 are performed again (using the second screw instead of the first screw), and in this case, in step S3 of the second work process, a new change criterion, in particular a new change threshold WSW, is calculated. Illustratively, the slope value in the second work process is different from the slope value in the first work process, so that a different change criterion, in particular a different change threshold WSW is obtained in the second work process than in the first work process. The present application relates to the invention described in the claims, but also includes the following as other aspects. 1. A power tool device (10), in particular a driver device and / or a drill device, A tool (2), in particular a drive unit (1) for rotating a drill bit or a driver blade, the power tool device (10) is configured to acquire at least one drive value (AG) during rotational driving of the tool (2), the drive value (AG) being a torque acting on the tool (2) and / or a drive value related to the torque, for example an electrical drive value of the drive unit (1); The power tool device (10) is configured to determine a change criterion based on the acquired at least one drive value (AG) during rotational driving of the tool (2), and to change the rotational driving of the tool (2) in response to the acquired drive value (AG) satisfying the change criterion. Power tool equipment (10). 2. The change criterion includes a change threshold (WSW), and when the slope of the acquired drive value (AG) reaches the change threshold, the acquired drive value (AG) satisfies the change criterion, in the power tool device (10) described above. 3. The power tool device (10) of claim 1 or 2, wherein the power tool device (10) is configured to reduce, terminate and / or change the rotational drive of the tool (2) to a pulsed operation in response to the acquired drive value (AG) satisfying a change criterion. 4. The power tool device (10) according to any one of 1 to 3 above, wherein the power tool device (10) is configured to determine the change criterion individually for each work process, in particular for each screwing process and / or each drilling process. 5. 5. The power tool device (10) according to any one of 1 to 4 above, wherein the power tool device (10) is configured to determine the change criterion based on the slope of the acquired drive value (AG). 6. The power tool device (10) is configured to determine a change threshold (WSW) as a change criterion based on the slope and a coefficient, particularly by multiplication, and to change the rotational drive of the tool (2) when the slope of the acquired drive value (AG) reaches the change threshold (WSW). 7. The power tool device (10) of claim 6, wherein the change criteria, change threshold (WSW) and / or coefficients are user-configurable. 8. The power tool device (10) has a plurality of different screwing modes, in particular a first screwing mode, a second screwing mode and / or a third screwing mode; In the first screwing mode, when the screw to be screwed into the surface (41) is flush with the surface (41) with the upper surface (38) of its head (39), the rotational drive is changed, In the second screwing mode, when the screw protrudes from the surface (41) with the upper surface (38) of its head (39), the rotational drive is changed, In the third screwing mode, the screw sinks below the surface (41) with the top surface (38) of its head (39). Included When rotating, the rotation drive is changed, A user can select one of the plurality of screwing modes, and the power tool (10) is configured to determine the change criterion taking into account the selected screwing mode. Any one of the power tool devices (10) from 1 to 7 above. 9. 9. The power tool device (10) of any one of 1 to 8 above, further configured to take previous screwing and / or drilling processes into account when identifying the change criteria. 10. 10. The power tool device (10) according to any one of 1 to 9 above, wherein the power tool device (10) is configured to acquire the time lapse (3) of the drive value (AG). 11. The power tool device (10) as described above, wherein the time course (3) has a first time section (4) and a second time section (5) that is placed temporally after the first time section, and the power tool device (10) is configured to determine the change criterion based on the slope of the first time section (4). 12. The power tool device (10) is configured to change the rotational drive of the tool (2) in response to the slope of the second transition section (5) satisfying a change criterion. 13. a drive device (6) having a drive unit (1); an attachment (7) detachably attached to the drive device (6), the attachment (7) for acquiring a drive value (AG), determining a change criterion and / or checking whether the acquired drive value (AG) satisfies the change criterion; 13. The power tool device (10) according to any one of 1 to 12 above, comprising: 14. a drive device (6) having a drive unit (1); a mobile device (8), for example a smartphone, The mobile device (8) is communicatively connected to the drive device (6) and configured to acquire a drive value (AG), determine a change criterion, and / or check whether the acquired drive value (AG) satisfies the change criterion, in any one of the power tool devices (10) described above in 1 to 13. 15. 15. The power tool (10) according to any one of claims 1 to 14, further comprising a sensor device (11) arranged at a torque application point, particularly at the shaft (9), for directly acquiring torque. 16. The power tool device (10) of any one of 1 to 15 above is configured to recognize, based on the acquired drive value (AG), in particular based on the time course (3) of the drive value (AG), that the tool (2) or a screw driven by the tool has come into contact with an undesired obstacle, such as an electric wire, and to change the rotational drive based on said recognition. 17. A method for operating a power tool (10), in particular a driver device and / or a drill device, having a drive unit (1) for rotationally driving a tool (2), in particular a drill bit or a driver blade, comprising: a step of starting (S1) rotational driving of the tool (2); detecting (S2) at least one drive value (AG) during the rotational driving of the tool (2), the drive value (AG) being a torque acting on the tool (2) and / or a drive value (AG) related to said torque, for example an electrical drive value of the drive unit (1); A step of determining a change criterion based on at least one acquired drive value (AG) during rotational driving of the tool (2); modifying the rotational drive in response to the obtained drive value (AG) satisfying a modification criterion (S4); A method comprising:

Claims

1. A power tool device (10) that is a driver device, A drive unit (1) for rotationally driving a tool (2), The power tool device (10) is configured to acquire at least one drive value (AG) during rotational driving of the tool (2), the drive value (AG) being a torque acting on the tool (2) and / or a drive value related to the torque, for example an electrical drive value of the drive unit (1); The power tool device (10) is configured to determine a change criterion based on at least one acquired drive value (AG) during rotational driving of the tool (2), and to reduce, terminate, and / or change the rotational driving of the tool (2) to a pulsed operation in response to the acquired drive value (AG) satisfying the change criterion; The power tool device (10) includes: a first screwing mode in which the rotational drive is changed when the screw to be screwed into the surface (41) of the workpiece (34) is flush with the surface (41) with the upper surface (38) of its head (39); a second screwing mode in which the rotational drive is changed when the screw protrudes from the surface (41) with the upper surface (38) of its head (39); and a third screwing mode in which the rotational drive is changed when the screw sinks below the surface (41) with the upper surface (38) of its head (39), A user can select one screwing mode from the plurality of screwing modes of the power tool device (10), and the power tool device (10) is configured to determine a change criterion taking into consideration the selected screwing mode. Power tool device (10).

2. The power tool device (10) of claim 1, wherein the change criteria include a change threshold (WSW), and when the slope of the acquired drive value (AG) reaches the change threshold, the acquired drive value (AG) satisfies the change criteria.

3. 3. The power tool device (10) according to claim 1 or 2, wherein the power tool device (10) is configured to determine the change criterion individually for each screwing process.

4. The power tool device (10) according to any one of claims 1 to 3, wherein the power tool device (10) is configured to determine the modification criterion based on a slope of the acquired drive value (AG).

5. The power tool device (10) is configured to determine a change threshold (WSW) as a change criterion by multiplying the slope of the acquired drive value (AG) by a coefficient, and to reduce, terminate and / or change the rotational drive of the tool (2) to pulse operation when the slope of the acquired drive value (AG) reaches the change threshold (WSW).

6. 6. The power tool device (10) of claim 5, wherein the modification criteria, modification thresholds (WSW) and / or coefficients are user configurable.

7. The power tool device (10) according to any one of claims 1 to 6, wherein the power tool device (10) is further configured to take previous screwing processes into account when identifying the change criterion.

8. The power tool device (10) according to any one of claims 1 to 7, wherein the power tool device (10) is configured to acquire the time course (3) of the drive value (AG).

9. 9. The power tool device (10) of claim 8, wherein the time course (3) has a first time section (4) and a second time section (5) that is positioned temporally after the first time section, and the power tool device (10) is configured to determine the change criterion based on a slope of the acquired drive value (AG) in the first time section (4).

10. The power tool device (10) is configured to change the rotational drive of the tool (2) in response to the slope of the acquired drive value (AG) of the second progression section (5) satisfying a change criterion.

11. a drive machine (6) having a drive unit (1); an attachment (7) detachably attached to the drive device (6), the attachment (7) for acquiring a drive value (AG), determining a change criterion and / or checking whether the acquired drive value (AG) satisfies the change criterion; The power tool device (10) according to any one of claims 1 to 10, comprising:

12. a drive machine (6) having a drive unit (1); a mobile device (8), for example a smartphone, A power tool device (10) as described in any one of claims 1 to 11, wherein the mobile device (8) is communicatively connected to the drive device (6) and is configured to acquire a drive value (AG), determine a change criterion, and / or check whether the acquired drive value (AG) satisfies the change criterion.

13. 13. The power tool device (10) according to any one of claims 1 to 12, further comprising a sensor device (11) arranged at a torque application point or shaft (9) for directly acquiring torque.

14. The power tool device (10) is configured to recognize, based on the acquired drive value (AG) or based on the time course (3) of the drive value (AG), that the tool (2) or a screw driven by the tool has come into contact with an undesired obstacle, for example an electric wire, and to change the rotational drive based on this recognition.

15. 15. A method for operating a power tool device (10) according to any one of claims 1 to 14, comprising a drive unit (1) for driving a tool (2) in rotation, A step of starting rotational driving of the tool (2) (S1); detecting (S2) at least one drive value (AG) during rotational driving of the tool (2), the drive value (AG) being a torque acting on the tool (2) and / or a drive value (AG) related to said torque, for example an electrical drive value of the drive unit (1); determining (S3) a change criterion based on at least one drive value (AG) acquired during rotational driving of the tool (2); S4: reducing, terminating and / or changing the rotational drive to pulsed operation in response to the obtained drive value (AG) satisfying a change criterion; A method comprising:

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