Electric tool apparatus and methods

Abstract

The present invention relates to an electric tool device (10), particularly a screwing and / or drilling device, comprising a drive unit (1) for rotating a tool (2), particularly a drill or screwdriver blade, wherein the electric tool device (10) is configured to detect at least one drive parameter (AG) during rotating the tool (2), wherein the drive parameter (AG) is a torque acting on the tool (2) and / or a drive parameter related to the torque, such as an electrical drive parameter of the drive unit (1), and wherein the electric tool device (10) is configured to determine a change criterion based on at least one detected drive parameter (AG) during rotating the tool (2) and to change the rotational drive of the tool (2) in response to the detected drive parameter (AG) satisfying the change criterion.

Description

Technical Field

[0001] This invention relates to a power tool device, particularly a screwing and / or drilling device, comprising a drive unit for rotating the tool, particularly a drill or screwdriver blade. The power tool device is configured to detect at least one drive parameter during the rotational driving of the tool. The drive parameter is the torque acting on the tool and / or drive parameters related to said torque, such as the electrical drive parameters of the drive unit. Background Technology

[0002] In conventional power tool devices, such as traditional battery-operated screwdrivers, the user can adjust the torque limit to restrict the torque acting on the tool. By selecting the correct value for the torque limit, the user can bring the work process performed by the power tool, such as screwing and / or drilling, to a stop at the desired working state. For the process of screwing threaded fasteners into the workpiece, it is generally desirable to adjust the torque limit according to the screwing torque of the screwdriver head, so that the screwing process stops when the screwdriver head has reached or is flush with the surface of the workpiece.

[0003] US 8,919,456 B2 describes a method for controlling the operation of a power tool. The current supplied to the electric motor of the power tool is periodically scanned. A slope of a series of current measurements is determined using linear regression. The transmission of torque to the output spindle is interrupted, at least in part, based on this series of current measurements. Summary of the Invention

[0004] The objective of this invention is to simplify for users obtaining the desired results when working with power tools.

[0005] The task is accomplished by the power tool apparatus according to claim 1. The power tool apparatus is configured to determine a variation criterion based on at least one detected drive parameter during rotational driving of the tool and to change the rotational drive of the tool in response to the detected drive parameter satisfying the variation criterion.

[0006] To achieve the desired results, it is necessary during the operation of a power tool to change the rotational drive of the tool at the correct time, for example, by lowering, stopping, and / or switching to pulse operation. This operation particularly relates to screwing or drilling processes. For example, during screwing, it is often necessary to change the rotational drive at the correct time, such as by lowering, stopping, and / or switching to pulse operation, so that the tool-driven threaded fastener no longer continues to be screwed into the workpiece. This correct time is given, for example, when the upper side of the screwing head is in the desired position relative to the surface of the workpiece (e.g., when the upper side of the screwing head is flush with the surface of the workpiece).

[0007] In the conventional power tool setup mentioned at the beginning, the user must know during the preparation phase which torque limit to adjust for the corresponding working process to obtain the desired result. Which torque limit yields the desired result depends, for example, on the tool and / or the object being machined, particularly its material. There is a risk that the user may select the wrong torque limit, which could cause the working process to not stop at the correct time, thus failing to achieve the desired result (e.g., the desired depth of penetration).

[0008] As mentioned earlier, in the aforementioned power tool device, a variation criterion is determined during rotary drive, that is, during the current working process, such as the current threading process, and the rotary drive is adjusted based on this variation criterion. This ensures that a matching variation criterion is selected for the current working process, such as for the current workpiece, the current tool, and / or the current threaded fastener to be threaded. The drive parameters detected during rotary drive depend on the workpiece, tool, and / or threaded fastener, and based on these detected drive parameters, a matching variation criterion for the current working process can be determined. Therefore, the matching variation criterion can be automatically determined by the power tool device, thereby simplifying the process for the user to achieve the desired results when working with the power tool device.

[0009] Preferably, the variation criterion includes a variation threshold. For example, the driving parameter satisfies the variation criterion when the slope of the driving parameter reaches the variation threshold.

[0010] According to a preferred embodiment, the power tool device is configured to calculate a slope value of a detected drive parameter during the rotational drive of the tool 2, calculate a change threshold based on the slope value (e.g., by multiplying by a coefficient), and continuously compare the current slope of the drive parameter with the change threshold. The power tool device is preferably configured to change the rotational drive of the tool 2 in response to the comparison indicating that the current slope has reached the change threshold, for example, by terminating, reducing, or changing to pulsed operation. The power tool device is particularly configured to recalculate its own, process-specific change threshold for each working process, particularly each screw-in process, e.g., each rotational drive. Preferably, the power tool device determines the change threshold only once per working process, e.g., each screw-in process, i.e., preferably based on a unique slope value determined during the working process. The power tool device is particularly configured to perform the comparison with the current slope only after the change threshold has been determined. The power tool device is preferably configured to determine the change threshold individually (i.e., re) for each screw-in process.

[0011] Preferably, the change standard, especially the change threshold, is calculated based on one or more detected driving parameters.

[0012] Advantageous improvements are the subject of the dependent claims.

[0013] The present invention further relates to a method for operating a power tool device, particularly a screwdriver or drill device, by means of a drive unit for rotating a tool, particularly a drill or screwdriver blade, comprising the steps of: initiating rotational drive of the tool; detecting at least one drive parameter during rotational drive of the tool, wherein the drive parameter is a torque acting on the tool and / or a drive parameter related to the torque, such as an electrical drive parameter of the drive unit; determining a variation criterion based on the detected at least one drive parameter during rotational drive of the tool; and changing the rotational drive in response to the detected drive parameter satisfying the variation criterion.

[0014] Suitablely, the method is performed using the described power tool device and / or constructed with an improvement thereof. Attached Figure Description

[0015] Further exemplary details and exemplary embodiments are then explained with reference to the accompanying drawings. Herein,

[0016] Figure 1 A schematic diagram showing a power tool assembly.

[0017] Figure 2 This shows the time-varying trends of the driving parameters and the time-varying trends of the driving parameter slopes.

[0018] Figure 3 The image shows the workpiece and three threaded fasteners, which have been screwed into the workpiece in different screw-in patterns.

[0019] Figure 4 A power tool assembly with additional instruments is shown.

[0020] Figure 5 A power tool device with a movable instrument is shown, and

[0021] Figure 6 A flowchart illustrating a method for operating a power tool device. Detailed Implementation

[0022] Figure 1 The power tool device 10 is shown, which is exemplary implemented as a screwing and / or drilling device.

[0023] The power tool device 10 includes a drive instrument 6 and a tool 2 exemplaryly mounted on the drive instrument 6. The drive instrument 6 is implemented as a handheld instrument. The drive instrument 6 is, for example, a drill screwdriver, especially a battery-powered drill screwdriver. Exemplarily, the drive instrument 6 is implemented in a T-shape. Alternatively, the drive instrument can be implemented in a pistol shape.

[0024] The drive instrument 6 has a gripping section 14, which the user can grip with their hand to carry and guide the drive instrument 6. Suitably, the gripping section 14 is oriented vertically along its longitudinal axis.

[0025] The driving instrument 6 also has a lever section 15. A tool 2 is arranged at the front end of the lever section 15. Suitably, an axis 9 extends through the lever section 15. The lever section 15 is oriented horizontally in a demonstrative manner along its longitudinal axis.

[0026] The drive instrument 6 further includes an energy storage section 16, which is exemplary arranged below the gripping section 14. The energy storage section 16 includes an energy storage device 17, such as a battery.

[0027] The power tool device 10 includes a drive unit 1 for rotating a drive tool 2. The drive unit 1 includes, for example, an electric motor for rotating the drive tool 2. The tool 2 is exemplary of a screwdriver blade. Alternatively, the tool 2 can also be a drill. The power tool device 10 exemplary includes a shaft 9 through which the tool 2 is coupled to the drive unit 1, particularly the electric motor, so that the tool 2 can be put into rotational motion via the drive unit 1 and the shaft 9.

[0028] The power tool device 10, particularly the drive instrument 6, includes an operating mechanism 18, which exemplaryly includes a first operating element 21 and / or optionally a second operating element 22. Suitably, the operating mechanism 18, particularly the first operating element 21, is used to control, particularly to start and / or stop, the rotational drive of the tool 2 provided by the drive unit 1. The first operating element 21 is preferably implemented as a pull-out key and suitably arranged at the gripping section 14. The optional second operating element 22 is suitably implemented as a rotation switch. The second operating element 22 is used, for example, to select one of the screw-in modes, which will be explained later.

[0029] The power tool device 10 includes a control unit 19, which may include, for example, a microcontroller. The control unit 19 is particularly configured to detect user input via the operating mechanism 18, particularly via a first operating element 21 and / or a second operating element 22. The control unit 19 is configured to operate the drive unit 1, thereby providing rotational drive for the tool 2. The control unit 19 is particularly configured to perform operation on the drive unit 1, taking into account the detected user input.

[0030] The drive instrument 6 includes a housing 12 in which a control unit 19 and a drive unit 1 are exemplary arranged. The gripping section 14 is exemplary part of the housing 12.

[0031] The power tool device 10, particularly the drive instrument 6, is configured to detect at least one drive parameter AG during the rotational drive of the tool 2. The detection of the drive parameter AG is performed, for example, by means of a control unit 19.

[0032] Figure 2 An exemplary view of the drive parameter AG, detected during the screwing process, shows its trend over time 3 and the slope of the drive parameter AG as a function of time 23. The drive parameter AG is a drive parameter related to the torque. The drive parameter AG is particularly a parameter related to the torque acting on the tool 2. The drive parameter AG is, for example, an electrical drive parameter of the drive unit 1. The drive parameter AG is particularly the current supplied to the drive unit 1. The drive parameter AG is, for example, the motor current. The drive parameter AG can also be the torque acting on the tool 2.

[0033] The power tool device 10 is configured to detect the time-varying trend 3 of the drive parameter AG. The power tool device 10 is configured, for example, to detect the drive parameter AG multiple times sequentially, particularly periodically, to obtain the time-varying trend 3 of the drive parameter AG. The time-varying trend 3 comprises a large number of continuously detected values ​​of the drive parameter AG. The time-varying trend 3 can also be referred to as a drive parameter curve or a drive parameter characteristic line. The detection of the drive parameter AG is exemplaryly performed by means of a control unit 19.

[0034] The power tool device 10 is specifically configured to calculate the slope based on the direction of time 3. For example, the power tool device 10 is configured to calculate the time derivative dAG / dt of the drive parameter AG to obtain the slope. The calculation of the slope is exemplarily performed by means of the control unit 19.

[0035] exist Figure 2 The time progression 3 shown can be derived during the screwing process performed by the power tool device 10. The screwing process begins at a first time point t1, at which time the user, for example, triggers the rotation drive of the tool 2, for example by manipulating the first operating element 21. At said time point, the tool 2 is engaged with the screw head of the threaded fastener that should be screwed into the workpiece, for example, the workpiece. In a first time range from the first time point t1 to the second time point t2, the drive parameter AG increases with a first slope ST1, which is suitably within a first slope range. The first time range can also be referred to as a first slope segment 31. In the first slope segment 31, the threaded fastener sinks into the material of the workpiece and causes the material to crack. Exemplarily, the torque acting on the tool 2 (and the drive parameter AG, which is particularly associated with the torque) increases in the first slope segment 31. The first slope segment 31 has an almost linear slope. Purely exemplary, the slope in the first slope segment 31 is constant.

[0036] Following the first time range is a second time range from the second time point t2 to the third time point t3. This second time range can also be referred to as the second slope segment 32. In the second time range, the drive parameter AG increases with a second slope ST2, which is suitably within the second slope range. The second slope ST2 is exemplary smaller than the first slope ST1. The second slope range is particularly smaller than the first slope range. For example, the average slope of the second slope range is less than the average slope of the first slope range. In the second slope segment 32, the threaded fastener is screwed into the workpiece with its threads. Exemplarily, the torque acting on the tool 2 (and the drive parameter AG, which is particularly related to the torque) increases in the second slope segment 32. The second slope segment 32 has an almost linear slope. Purely exemplary, the slope in the second slope segment 32 is constant.

[0037] The first time range and the second time range together form the first directional segment 4, which extends from the first time point t1 to the third time point t3.

[0038] Following the second time range is the third time range from the third time point t3 to the fourth time point t4. This third time range can also be referred to as the third slope segment 33. In this third time range, the drive parameter AG increases with a third slope ST3, which suitably falls within the third slope range. The third slope ST3 is exemplary greater than the first slope ST1. The third slope range is particularly higher than the first slope range. The average slope of the third slope range is, for example, greater than the average slope of the first slope range. In the third slope segment 33, the turning head penetrates into the material of the workpiece. Exemplarily, in the third slope segment 32, the torque acting on the tool 2 (and the drive parameter AG, which is particularly related to the torque) increases. The third slope segment 33 has an almost linear slope. Purely exemplary, the slope in the third slope segment 33 is constant.

[0039] Exemplary, the drive parameter AG does not continue to increase after the third time range and decreases at this point, for example, because the rotation drive of tool 2 has been terminated.

[0040] The third time range forms the second directional segment 5, which extends from the third time point t3 to the fourth time point t4. The second directional segment 5 is time-wise after the first directional segment 4.

[0041] The power tool device 10, especially the control unit 19, is configured to determine a change criterion based on at least one detected drive parameter AG during the rotational drive of the tool 2 and to change the rotational drive of the tool 2 in response to the detected drive parameter AG satisfying the change criterion.

[0042] Preferably, the power tool device 10, and especially the control unit 19, is configured to individually determine variation criteria for each working process, particularly each screwing-in process and / or each drilling process. Specifically, it determines its own variation criteria for each working process, which are suitably applied to that working process, and particularly only to that working process. Suitably, each variation criterion applies only to the corresponding working process in which the variation criterion has already been determined. In each new working process, a new variation criterion is determined and suitably applied.

[0043] The working process specifically refers to the screwing-in or drilling process. The corresponding working process begins, for example, with the start of the rotational drive of tool 2 and / or with user operation of the first operating element 21. The corresponding working process suitably continues for as long as the drive unit 1 provides the rotational drive of tool 2 and / or as long as the first operating element 21 remains operated. Suitably, the corresponding working process continues for such a long time that (after stopping the rotational drive of tool 2) another rotational drive of tool 2 begins and / or until (after stopping user operation of the first operating element 21) another user operation of the first operating element 21 is performed. The new working process begins with another start and / or another user operation. The previous working process terminates no later than the start of the new working process. The working process can continue for such a long time, especially with the presence of continuous rotational drive of tool 2 and / or continuous user operation of the first operating element 21, and preferably terminates with the end of continuous rotational drive and / or continuous user operation. Suitably, a minimum duration can be defined in the power tool device 10, which must be elapsed before the working process is considered terminated. Optionally, the user can input via the operating mechanism 18 to terminate the current work process.

[0044] Preferably, the variation criterion includes a variation threshold WSW, and the detected driving parameter AG satisfies the variation criterion when the slope of the detected driving parameter AG reaches the variation threshold WSW. The variation threshold WSW is exemplary to be greater than a first slope ST1 and / or less than a third slope ST3.

[0045] Accordingly, the power tool device 10, and especially the control unit 19, is preferably configured to determine a change threshold WSW based on at least one detected drive parameter AG during the rotation of the tool 2, and to change the rotation drive of the tool 2 in response to the current slope of the detected drive parameter AG reaching the change threshold WSW. Preferably, the power tool device 10, and especially the control unit 19, is configured to determine the change threshold WSW individually for each working process, especially each screwing-in process and / or each drilling process. Specifically, a change threshold WSW is determined for each working process. Suitably, each change threshold WSW is applied only to the corresponding working process in which the change threshold has already been determined. In each new working process, a new change threshold WSW is determined and suitably applied.

[0046] Preferably, the power tool device 10, particularly the drive instrument 6, and preferably the control unit 19, are configured to determine a variation criterion based on the slope, particularly the slope value, of the detected drive parameter AG. The slope value is, for example, the average slope. Furthermore, the slope value can be the maximum slope.

[0047] The power tool device 10 is configured, for example, to determine a change threshold WSW as a change criterion based on the slope of the drive parameter AG, particularly the slope value and a coefficient (particularly by multiplication), and to change the rotational drive of the tool 2 when the current slope of the detected drive parameter AG reaches the change threshold WSW. That is, the change threshold WSW is suitably the product of the slope of the drive parameter, particularly the slope value and a coefficient.

[0048] Preferably, the power tool device 10, and especially the control unit 19, is configured to determine a variation criterion, and especially a variation threshold WSW, based on the first directional segment 4, especially the first slope segment 31, preferably only the slope of the first slope segment 31, and especially the slope value. The power tool device 10 determines the variation threshold WSW specifically based on the calculated slope value of the first slope segment 31. The slope value is, for example, the average slope of the first slope segment 31. Furthermore, the slope value can be the maximum slope of the first slope segment 31. Suitably, the slope value is based only on the slope of the first slope segment 31 and especially not on the slope of the second slope segment 32 and / or not on the slope of the third slope segment 33.

[0049] Exemplarily, the power tool device 10 is configured to detect the endpoints of a first slope segment 31, for example, based on the slope over a time period 3. For example, the power tool device 10 is configured to continuously calculate the slope over a time period 3 and detect the endpoints of the first slope segment 31 based on the continuously calculated slopes, for example, at which the continuously calculated slope decreases. The power tool device 10 is suitably configured to calculate a slope value (based on which it calculates a change criterion, particularly a change threshold WSW) and / or a change criterion, particularly a change threshold WSW, in response to having detected the endpoints of the first slope segment 31. The power tool device 10 suitably calculates the slope value only after the slope segment 31 has terminated. For example, the power tool device 10 calculates the slope value as the average or maximum slope of the first slope segment 31, based on which it calculates the change criterion.

[0050] Preferably, the power tool device 10, and preferably the control unit 19, are configured to change the rotational drive of the tool 2 in response to the slope of the second directional segment 5 meeting a change criterion. Exemplarily, the change criterion is met when the slope of the second directional segment 5 reaches a change threshold WSW.

[0051] Preferably, the power tool device 10 is configured to reduce, terminate, and / or change the rotational drive of the tool 2 to pulsed operation in response to a detected change criterion of the drive parameter AG. The change in the rotational drive of the tool 2 is particularly performed such that the threaded fastener driven by the tool 2 ceases to screw into the workpiece. The change in the rotational drive of the tool 2 is suitably performed in such a manner that the control unit 19 alters its control over the drive unit 1, for example, by reducing the motor current of the drive unit 1.

[0052] For example, when the rotation drive is changed, the torque acting on tool 2 is reduced, for example, to zero or to a value greater than zero. During the pulse operation, torque pulses are applied to tool 2 at time intervals (by means of drive unit 1). Between torque pulses, the torque acting on tool 2 can be reduced to zero.

[0053] If the change in rotational drive involves disconnecting the rotational drive, then the change criterion can also be called the disconnection criterion and the change threshold can be called the disconnection threshold.

[0054] Preferably, the power tool device 10 has multiple different screw-in modes. The user can select a screw-in mode from the available screw-in modes, suitably by means of an operating mechanism, especially by means of a second operating element 22. For example, the second operating element 22 can be placed in multiple different positions, especially in a rotating position, and different positions are associated with different screw-in modes.

[0055] The power tool device 10 is configured to determine a variation criterion, particularly a variation threshold WSW, taking into account the selected screw-in mode. For example, each screw-in mode is assigned a corresponding coefficient, which is used to calculate the variation threshold WSW. Exemplarily, the power tool device 10 is configured to determine the coefficients based on the selected screw-in mode, and to calculate the variation threshold WSW accordingly, that is, coefficients multiplied by a slope value with respect to the direction of time 3 in order to calculate the variation threshold WSW.

[0056] Subsequently, it should be referred to Figure 3 To illustrate three exemplary spin-in modes.

[0057] Figure 3 The workpiece 34 is shown, along with three threaded fasteners 35, 36, and 37 that have been screwed in using different screw-in patterns.

[0058] The power tool device 10 exemplary has a first screw-in mode. The first screw-in mode is used to screw a first threaded fastener 35 into the workpiece 34. The first screw-in mode is used to screw the threaded fastener in such a way that, at the end of the working process, the upper side 38 of its screwing head 39 is flush with the surface 41 of the workpiece 34. In the first screw-in mode, when the threaded fastener 35 is flush with the surface 41 of the workpiece 34 with its screwing head 39, the rotational drive of the tool 2 is altered, particularly reduced, terminated, and / or changed to pulsed operation. The power tool device 10 is particularly configured such that, in the first screw-in mode, a change threshold WSW is selected such that, when the threaded fastener 35 is flush with the surface 41 of the workpiece 34 with its screwing head 39, the slope of the time course 3 reaches the change threshold WSW. Suitably, in the first screw-in mode, the power tool device 10 applies a first coefficient to calculate the variation threshold WSW, which is selected such that when the threaded fastener 35 is flush with the surface 41 of the workpiece 34 at the upper side 38 of its screw-in head 39, the slope of the time-dependent direction 3 reaches the variation threshold WSW. Suitably, the first coefficient is predetermined and / or stored in advance (i.e., before the corresponding work process is performed) in the power tool device 10. The first coefficient is determined, for example, empirically.

[0059] The power tool device 10 exemplary has a second screw-in mode. This second screw-in mode is used to screw a second threaded fastener 36 into the workpiece 34. The second screw-in mode is used to screw the threaded fastener in such a way that, upon termination of the work process, its upper side 38 of the screw-in head 39 protrudes above the surface 41. In the second screw-in mode, when the threaded fastener 36 protrudes above the surface 41 with its upper side 38 of the screw-in head 39, the rotational drive of the tool 2 is altered, particularly reduced, terminated, and / or changed to pulsed operation. The power tool device 10 is particularly configured to select a change threshold WSW in the second screw-in mode such that, when the threaded fastener 36 protrudes above the surface 41 with its upper side 38 of the screw-in head 39, the slope of the time course 3 reaches the change threshold WSW, wherein, suitably, the screw-in head 39 is partially submerged in the workpiece 34. Suitably, in the second screw-in mode, the power tool device 10 applies a second coefficient to calculate the variation threshold WSW, which is selected such that the slope of the time course 3 reaches the variation threshold WSW when the threaded fastener 35 protrudes above the surface 41 with its upper side 38 of the screw-in head 39, wherein, suitably, the screw-in head 39 is partially submerged in the workpiece 34. Suitably, the second coefficient is predetermined and / or stored in advance (i.e., before performing the corresponding work process). The second coefficient is determined, for example, empirically. The second coefficient is exemplary smaller than the first coefficient. In the second screw-in mode, the variation threshold WSW is exemplary smaller than in the first screw-in mode.

[0060] The power tool device 10 exemplary has a third screw-in mode. This third screw-in mode is used to screw a third threaded fastener 37 into the workpiece 34. The third screw-in mode is used to screw the threaded fastener in such a way that, upon termination of the work process, the upper side 38 of its screwing head 39 sinks below the surface 41. In the third screw-in mode, when the threaded fastener 37 sinks below the surface 41 with its upper side 38 of its screwing head 39, the rotational drive of the tool 2 is altered, particularly reduced, terminated, and / or changed to pulsed operation. The power tool device 10 is particularly configured to select a change threshold WSW in the third screw-in mode such that, when the threaded fastener 36 sinks below the surface 41 with its upper side 38 of its screwing head 39, the slope of the time course 3 reaches the change threshold WSW. Suitably, in the third screw-in mode, the power tool device 10 applies a third coefficient to calculate the variation threshold WSW, which is selected such that the slope of the time course 3 reaches the variation threshold WSW when the threaded fastener 35 sinks below the surface 41 with its upper side 38 of the screw-in head 39. The third coefficient is suitably predetermined and / or stored in the power tool device 10 beforehand (i.e., prior to the execution of the corresponding work process). The third coefficient is determined, for example, empirically. The third coefficient is exemplary greater than the first coefficient. In the third screw-in mode, the variation threshold WSW is exemplary greater than in the first screw-in mode.

[0061] Preferably, the coefficients, especially the first coefficient, the second coefficient and / or the third coefficient and / or the change threshold WSW, can be controlled by the user, for example by means of the operating mechanism 18, and / or preset to be fixed.

[0062] Optionally, the screw-in mode can be selected by means of an instrument attached to the driving instrument 6, such as an IoT instrument, that is, an Internet of Things (IoT) instrument, especially by the user.

[0063] As explained above, the power tool device multiplies the slope value of the time-direction 3 with a coefficient to calculate the variation threshold WSW. Preferably, the power tool device 10 matches the coefficient according to the selected screw-in mode. The power tool device 10 compares the variation threshold WSW with another slope of the time-direction 3, and when the other slope reaches the variation threshold WSW, the power tool device 10 changes the rotation drive of the tool 2, specifically changing it so that the threaded fastener is no longer screwed in.

[0064] Preferably, the variation standard, variation threshold WSW, and / or coefficient can be preset by the user. For example, the variation standard, variation threshold WSW, and / or coefficient can be input through the operating mechanism 18, especially the second operating element 22. For example, the variation standard, variation threshold WSW, and / or coefficient can be controlled by the user or preset to be constant.

[0065] Optionally, the variation standard, variation threshold WSW, and / or coefficients can be input by means of an instrument attached to the driving instrument 6, such as an IoT instrument, that is, an Internet of Things instrument, especially by the user.

[0066] Preferably, the power tool device 10 is further configured to take into account previous working processes, particularly the screwing-in process and / or drilling process, when determining the change criteria. For example, the power tool device 10 is configured to detect and store working data during the corresponding working process, and to apply said working data to subsequent working processes when determining the change criteria, particularly when determining the change threshold, and preferably when determining the coefficient. The working data includes, for example, the detected drive parameters AG, particularly with respect to the time progression 3. Furthermore, the working data can include information about corrective manipulations performed by the user, particularly of the first operating element 21 (e.g., after changing the rotation drive).

[0067] The power tool device 10 is configured, for example, to detect that the user has manipulated the first operating element 21 to further screw the threaded fastener into the workpiece after changing the rotational drive in response to meeting a change criterion. The power tool device 10 is suitably configured to provide correction information as work data based on the detection and to match the calculation of a change threshold WSW for subsequent work processes based on the correction information such that the change threshold WSW is selected as large as it would be if the correction information were not present.

[0068] Suitablely, the power tool device 10 has a KI component, such as an artificial neural network, and is configured to calculate, for example, a change standard, a change threshold, and preferably a coefficient when the KI component is applied, for example, when considering work data, especially from previous work processes.

[0069] As mentioned above, the drive parameter AG relates in particular to electrical parameters, such as the motor current of the electric motor in drive unit 1. Alternatively or additionally, the detected torque can also be used as the drive parameter AG. Optionally, the power tool device 10 includes a sensor mechanism 11 arranged at the location where the torque is applied, particularly at shaft 9, for directly detecting the torque, which can be used as the drive parameter AG. The sensor mechanism 11 includes, for example, strain gauges, sensors for measuring mechanical stress, magnetostrictive units, and / or piezoelectric sensor units for detecting mechanical deformation. The sensor mechanism 11 is configured to detect the torque at shaft 9, particularly the drive shaft, driven shaft, and / or motor shaft. Furthermore, the sensor mechanism 11 can be part of the additional instrument 7 described below.

[0070] Optionally, the power tool device 10 is configured to identify, based on detected drive parameters AG, particularly based on the time-dependent trajectory of drive parameters AG, that the tool 2 or the threaded fastener driven by the tool has collided with an undesirable obstacle, such as an electrical wire, and to modify, particularly terminate, reduce, and / or change, the rotational drive based on said identification. For example, obstacle features are stored in the power tool device 10, and the power tool device 10 is configured to compare the detected time-dependent trajectory of drive parameters AG with the obstacle features and, for example, modify the rotational drive based on said comparison when the time-dependent trajectory 3 corresponds to the obstacle feature.

[0071] Figure 4 An exemplary configuration of a power tool assembly 10 is shown, wherein the power tool assembly 10 includes an auxiliary instrument 7. The auxiliary instrument 7 is detachably mounted to the drive instrument 6, exemplaryly mounted to its lever section 15. The auxiliary instrument 7 is communicatively connected to the drive instrument 6. The auxiliary instrument 7 can be implemented, for example, as an auxiliary handle. Suitably, the auxiliary instrument 7 is unnecessary for providing rotational drive for the tool 2 by means of the drive unit 1. The auxiliary instrument 7 is preferably configured to detect drive parameters AG, to calculate variation criteria, particularly to calculate variation thresholds WSW and / or coefficients, and / or to check whether the detected drive parameters AG meet variation criteria, such as whether the slope of the drive parameters AG reaches the variation threshold. Preferably, the auxiliary instrument 7 includes an auxiliary instrument sensor unit and / or an auxiliary instrument control unit for detecting drive parameters AG. The auxiliary instrument control unit is suitably communicatively connected to the control unit 19, particularly wirelessly, for example via Bluetooth and / or wired connection. The auxiliary instrument 7 can also be part of the operating mechanism 18, particularly providing a second operating element.

[0072] Figure 5An exemplary configuration of a power tool device 10 is shown, wherein the power tool device 10 includes a movable instrument 8, such as a smartphone, which is communicatively connected to a drive instrument 6, particularly to a control unit 19, particularly wired and / or wirelessly, for example via Bluetooth. The movable instrument 8 exists separately from the drive instrument 6. The movable instrument 8 is preferably configured to detect drive parameters AG, to calculate variation criteria, particularly variation thresholds WSW and / or coefficients, and / or to check whether the detected drive parameters AG meet variation criteria, such as whether the slope of the drive parameters AG reaches a variation threshold. Preferably, the movable instrument 8 includes a movable instrument sensor unit and / or a movable instrument control unit for detecting drive parameters AG. The movable instrument control unit is suitably communicatively connected to the control unit 19, particularly wirelessly and / or wiredly. Furthermore, the movable instrument 8 can be part of an operating mechanism 18, particularly providing a second operating element. Exemplarily, the movable instrument 8 includes a touchscreen 42, which forms part of the operating mechanism 18 and, for example, presents the second operating element.

[0073] Figure 6 A flowchart is shown for a method of operating a 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 manipulates the operating mechanism 18, and in particular the first operating element 21, to cause the drive unit 1 to begin providing rotational drive of the tool 2. Exemplarily, at this point in time, the tool 2 is engaged with the screw head of a first threaded fastener to be screwed into the workpiece.

[0074] The method includes a second step S2, in which at least one drive parameter AG is detected during the rotation of the drive tool 2, wherein the drive parameter AG is the torque acting on the tool 2 and / or a drive parameter AG related to said torque, such as the electric drive parameter of the drive unit 1. For example, the power tool device 10 sequentially detects multiple values ​​of the drive parameter AG and thus obtains, in particular, the time-dependent trend 3 of the drive parameter AG. Suitably, the detection of the drive parameter AG continues during a third step S3 and / or a fourth step S4. During the second step S2, the first threaded fastener is screwed into the workpiece.

[0075] The method further includes a third step S3, in which, during the rotation of the drive tool 2, a variation criterion is determined based on at least one detected drive parameter AG. For example, the power tool device 10 determines a slope value for a first slope segment 31, wherein the slope value is, for example, the average slope or maximum slope of the first slope segment 31. The power tool device 10 multiplies the slope value by a coefficient to calculate a variation threshold WSW as the variation criterion. During the third step, a first threaded fastener is screwed into the workpiece.

[0076] The method further includes a fourth step S4, in which the rotational drive is changed in response to the detected drive parameter AG meeting a change criterion. For example, the power tool device 10 continuously checks whether the current slope of the drive parameter AG has reached a change threshold WSW, that is, whether it is as large as the change threshold WSW. If the current slope has reached the change threshold WSW, the power tool device 10 determines that the change criterion is met, and changes the rotational drive of the tool 2 provided by the drive unit 1, in particular, such that the first threaded fastener no longer continues to be screwed into the workpiece. For example, the power tool device 10 terminates or reduces the rotational drive or changes it to pulse operation.

[0077] The steps S1 to S4 mentioned above exemplify the first working process, particularly the first screwing-in process. The first working process begins with step S1 and ends with step S4. Optionally, the first working process may include additional steps after step S4, wherein the user performs corrective manipulation of the first operating element 21, particularly within a predetermined time window, to continue screwing the first threaded fastener into the workpiece.

[0078] Optionally, the method includes an additional step of performing a second working process, particularly a second screw-in process, using a power tool device 10 after the first working process, wherein the second threaded fastener is screwed in. In the second working process, steps S1 to S4 are re-executed (instead of the first threaded fastener, using the second threaded fastener), and optionally S5 is re-executed, wherein the variation criterion, particularly the variation threshold, is recalculated in step S3 of the second working process. Exemplarily, the slope value in the second working process is different from the slope value in the first working process, thereby deriving a variation criterion, particularly a different variation threshold WSW, in the second working process compared to the first working process.

Claims

1. A power tool device (10), comprising a drive unit (1) for rotating a drive tool (2), wherein, The power tool device (10) is configured to detect at least one drive parameter AG during rotational driving of the tool (2), wherein the drive parameter AG is a torque acting on the tool (2) and / or a drive parameter related to the torque, and wherein the power tool device (10) is configured to determine a change criterion based on at least one detected drive parameter AG during rotational driving of the tool (2) and, in response to the detected drive parameter AG satisfying the change criterion, reduce, terminate, and / or change the rotational drive of the tool (2) to pulse operation; The power tool device (10) has multiple different screw-in modes, wherein a user can select one screw-in mode from the screw-in modes and the power tool device (10) is configured to determine the variation criteria in consideration of the selected screw-in mode.

2. The power tool device (10) according to claim 1, wherein, The change criteria include a change threshold WSW, and the detected driving parameter AG satisfies the change criteria when the growth rate of the detected driving parameter AG reaches the change threshold.

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

4. The power tool device (10) according to claim 1 or 2, wherein, The power tool device (10) is configured to determine the change criterion based on the detected growth rate of the drive parameter AG.

5. The power tool device (10) according to claim 4, wherein, The power tool device (10) is configured to determine a change threshold WSW as the change standard based on the growth rate and coefficient, and to change the rotational drive of the tool (2) when the growth rate of the detected drive parameter AG reaches the change threshold WSW.

6. The power tool device (10) according to claim 5, wherein, The change standard, the change threshold WSW, and / or the coefficient can be preset by the user.

7. The power tool device (10) according to claim 1 or 2, wherein, The power tool device (10) is further configured to take into account previous screw-in and / or drilling processes when determining the variation criteria.

8. The power tool device (10) according to claim 1 or 2, wherein, The power tool device (10) is configured to detect the time-related trend (3) of the drive parameter AG.

9. The power tool device (10) according to claim 8, wherein, The time-related direction (3) has a first direction segment (4) and a second direction segment (5) arranged in terms of time after the first direction segment, and wherein the power tool device (10) is configured to determine the change standard based on the slope of the first direction segment (4).

10. The power tool device (10) according to claim 9, wherein, The power tool device (10) is configured to change the rotational drive of the tool (2) in response to the slope of the second directional segment (5) satisfying the change criterion.

11. The power tool device (10) according to claim 1 or 2, comprising a drive instrument (6), the drive instrument including the drive unit (1), and comprising an additional instrument (7) removably disposed at the drive instrument (6), the additional instrument being used to detect the drive parameter AG, to determine the variation criterion, and / or to check whether the detected drive parameter AG meets the variation criterion.

12. The power tool device (10) according to claim 1 or 2, comprising a drive instrument (6) including the drive unit (1) and a movable instrument (8) communicatively connected to the drive instrument (6) and configured to detect the drive parameter AG, determine the variation criterion, and / or check whether the detected drive parameter AG meets the variation criterion.

13. The power tool device (10) according to claim 1 or 2, further comprising a sensor mechanism (11) arranged at the position where the torque is applied for direct detection of the torque.

14. The power tool device (10) according to claim 1 or 2, wherein, The power tool device (10) is configured to identify, based on the detected drive parameter AG, that the tool (2) or the threaded fastener driven by the tool has collided with an unwanted obstacle and to change the rotation drive based on the identification.

15. The power tool device (10) according to claim 1, wherein, The power tool device (10) is a screwing and / or drilling device.

16. The power tool device (10) according to claim 1, wherein, The tool (2) is a drill or screwdriver blade.

17. The power tool device (10) according to claim 1, wherein, The driving parameters related to the torque are the electric driving parameters of the driving unit (1).

18. The power tool device (10) according to claim 3, wherein, The power tool device (10) is configured to determine the variation criteria individually for each screw-in and / or drilling process.

19. The power tool device (10) according to claim 5, wherein, The power tool device (10) is configured to determine a change threshold WSW as the change standard by the product of the growth rate and the coefficient, and to change the rotation drive of the tool (2) when the growth rate of the detected drive parameter AG reaches the change threshold WSW.

20. The power tool device (10) according to claim 1, wherein, The power tool device (10) has a first screw-in mode in which the rotation drive is changed when the upper side (38) of the screwing head (39) of the threaded fastener to be screwed into the surface (41) is flush with the surface (41); a second screw-in mode in which the rotation drive is changed when the upper side (38) of the screwing head (39) of the threaded fastener protrudes above the surface (41); and / or a third screw-in mode in which the rotation drive is changed when the upper side (38) of the screwing head (39) of the threaded fastener sinks below the surface (41).

21. The power tool device (10) according to claim 12, wherein, The portable device (8) is a smartphone.

22. The power tool device (10) according to claim 13, wherein, The power tool device includes a shaft through which the tool is coupled to a drive unit, so that the tool can be put into rotational motion via the drive unit through the shaft, and the sensor mechanism (11) is arranged at the shaft (9).

23. The power tool device (10) according to claim 14, wherein, The power tool device (10) is configured to identify, based on the time-varying (3) trend of the drive parameter AG, that the tool (2) or the threaded fastener driven by the tool has collided with an unwanted obstacle and to change the rotation drive based on the identification.

24. The power tool device (10) according to claim 23, wherein, An undesirable obstacle is electrical wiring.

25. A method for operating a power tool device (10), the power tool device having a drive unit (1) for rotating a drive tool (2), comprising the following steps: - Start (S1) to rotate the tool (2), - During the rotation of the tool (2), at least one drive parameter AG is detected (S2), wherein, The driving parameter AG is the torque acting on the tool (2) and / or the driving parameter AG related to the torque. - During the rotation of the tool (2), a change criterion (S3) is determined based on at least one detected drive parameter AG, and - In response to the detected drive parameter AG meeting the change criteria, the rotation drive of the tool (2) will be reduced, terminated and / or changed to pulse operation; The power tool device (10) has multiple different screw-in modes, wherein the user can select one screw-in mode from the screw-in modes and the power tool device (10) determines the variation criteria in consideration of the selected screw-in mode.

26. The method of claim 25, wherein, The power tool device (10) is a screwing and / or drilling device.

27. The method according to claim 25, wherein, The tool (2) is a drill or screwdriver blade.

28. The method according to claim 25, wherein, The driving parameter AG related to the torque is the electric driving parameter of the driving unit (1).

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