EP2871029B1 - Procede pour faire fonctionner un outil electrique portatif et outil electrique portatif - Google Patents
Procede pour faire fonctionner un outil electrique portatif et outil electrique portatif Download PDFInfo
- Publication number
- EP2871029B1 EP2871029B1 EP13005286.3A EP13005286A EP2871029B1 EP 2871029 B1 EP2871029 B1 EP 2871029B1 EP 13005286 A EP13005286 A EP 13005286A EP 2871029 B1 EP2871029 B1 EP 2871029B1
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- EP
- European Patent Office
- Prior art keywords
- rotating shaft
- hand
- power tool
- held power
- mode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000000034 method Methods 0.000 title claims description 20
- 230000004913 activation Effects 0.000 claims description 9
- 230000001133 acceleration Effects 0.000 claims description 7
- 238000001514 detection method Methods 0.000 claims description 7
- 239000000523 sample Substances 0.000 claims description 4
- 230000005355 Hall effect Effects 0.000 claims description 3
- 230000003213 activating effect Effects 0.000 claims description 3
- 238000001994 activation Methods 0.000 description 8
- 230000008859 change Effects 0.000 description 4
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- FVEYIFISRORTDD-ROUUACIJSA-N 2-(4-phenoxyphenoxy)-6-[(1S,4S)-5-prop-2-enoyl-2,5-diazabicyclo[2.2.1]heptan-2-yl]pyridine-3-carboxamide Chemical class C(C=C)(=O)N1[C@@H]2CN([C@H](C1)C2)C1=NC(=C(C(=O)N)C=C1)OC1=CC=C(C=C1)OC1=CC=CC=C1 FVEYIFISRORTDD-ROUUACIJSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D16/00—Portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
- B25D16/006—Mode changers; Mechanisms connected thereto
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2216/00—Details of portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
- B25D2216/0007—Details of percussion or rotation modes
- B25D2216/0015—Tools having a percussion-only mode
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2216/00—Details of portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
- B25D2216/0007—Details of percussion or rotation modes
- B25D2216/0023—Tools having a percussion-and-rotation mode
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2216/00—Details of portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
- B25D2216/0007—Details of percussion or rotation modes
- B25D2216/0038—Tools having a rotation-only mode
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
- B25D2250/221—Sensors
Definitions
- the present invention concerns a method for operating a hand-held power tool according to independent claim 1 and a hand-held power tool according to independent claim 12.
- Hand-held power tools regularly comprise a rotating shaft, such as a tool shaft for holding a tool or a tool holding cylinder, which tool shaft or tool holding cylinder is driven in a number of possible ways when operating the band-held power tool.
- a rotating shaft such as a tool shaft for holding a tool or a tool holding cylinder, which tool shaft or tool holding cylinder is driven in a number of possible ways when operating the band-held power tool.
- the mode of driving the rotating shaft depends on, inter alia, the kind of tool mounted and the desired working effect of the hand-held power tool.
- Combi hammers provide an example for a hand-held power tool with multiple functionality.
- Such a combi hammer may be operated in a drill mode and in particular in a hammer drill mode, in which the combi hammer's tool shaft is both rotated and driven back and forth axially.
- a combi hammer may also be operated in a chiseling mode, in which the tool shaft is only driven back and forth axially and not
- This anti-twist protection function disengages the tool shaft from the driving motor or near-instantly brakes the driving motor when a sufficiently rapid twisting, i.e. rotation, of the hand-held power tool is detected. This may for example occur when the tool affixed to the tool shaft is blocked in its rotation while the combi hammer is operated in a hammer drill mode. In that case, the torque on the now immobile tool shaft is exerted on the hand-held power tool itself, causing an undesirable rotation of the hand-held power tool along with its handle.
- the anti-twist protection function prevents such an incidence or stops it.
- the document US 6 536 536 B1 relates to an electrically powered hand tool.
- the tool includes a motor, a power source, a work element and a controller.
- the document US 2011/114347 A1 relates to a hand-held tool which performs a predetermined operation on a workpiece by driving a tool bit.
- the hand-held tool represents an impact tool such as an electric hammer or hammer drill. It also suitably includes a drill and a vibration drill for drilling operation, an electric disc grinder for grinding and polishing operation, a rotary cutting machine such as a circular saw for cutting a workpiece, and a screw tightening machine for screw tightening operation.
- the document EP 0 018 603 A1 relates to safety devices for power driven tools and machine tool systems, and more particularly, to an anti-kickback power tool control method and system which is capable of sensing a significant and rapid change in the load on the tool and turning off the power to the tool and/or applying a break before lock-up occurs between the tool or implement and the workpiece.
- the document US 2006/254785 A1 is the closest prior-art with regard to the present invention.
- This prior-art relates to a power impact tool capable of performing a hammering operation on a workpiece by striking movement of a tool bit.
- the power impact tool includes a motor, a tool bit, a trigger and a mode changing member.
- the tool bit is driven by the motor.
- the tool bit has at least a driven mode to perform a predetermined operation on a workpiece by striking movement in the axial direction of the tool bit.
- the tool bit may preferably have another driven mode to perform a predetermined operation on a workpiece by a rotating movement on the axis of the tool bit or to perform a predetermined operation on a workpiece both by a striking movement and a rotating movement.
- the trigger is biased from the side of its operation position toward its initial position, while the trigger is normally held in the initial position.
- the trigger is manually operated by a user between the initial position and the operating position in order to control energization and non-energization of the motor.
- the mode changing member switches between a first mode in which the tool bit is caused to perform an operation by striking movement and a second mode in which the tool bit is caused to perform an operation by rotating movement around the axis of the tool bit solely or in addition to the striking movement.
- the prior art discloses a combi hammer with a user-operated switchover device by means of which the combi hammer can be mechanically switched between a hammer drill mode and a chiseling mode.
- This switchover device simultaneously also enables or disables an anti-twist protection function depending on whether the hammer drill mode or the chiseling mode is currently switched to.
- This combi hammer from the prior art comprises only the two abovementioned operating modes. Therefore, for this combi hammer the activation of the anti-twist protection may be decided upon binarily dependent on the switchover device.
- a hand-held power tool provides a number of different operating modes, with the currently active operating mode not determined by a single switchover device but rather based on a number of different user-settable switches or other input devices. Thus, determining whether or not to enable the anti-twist protection function may become a more complicated question.
- the invention is based on the recognition that a rotation movement characteristic of a rotating shaft may be directly detected and analyzed in order to determine an operational setting of the hand-held power tool, especially when that rotation movement characteristic is based on a switchable mechanical mode of the hand-held power tool.
- an electrical mode of the hand-held power tool is brought into alignment with its corresponding, respective mechanical mode based on this detection of the rotation movement of the rotating shaft. Consequently, the resulting electrical mode of the hand-held power tool is not statically set as a direct consequence of a switch or a similar user-actuated element, but rather dynamically based on the detection during actual operation.
- an advantageous sensor arrangement is provided, in particular with regard to the position, relative to the rotating shaft, within the hand-held power tool for detecting and analyzing a rotating movement characteristic of the rotating shaft during operation.
- a preferred embodiment describes an advantageous approach for combining the above preferred arrangement with a preferred mechanical way of switching between the mechanical modes of the hand-held power tool.
- the hand-held power tool 1 of Fig. 1 which by way of example is a combi hammer 2, comprises a rotating shaft 3, which in the present embodiment and preferably is a tool holding cylinder linked or linkable to a tool shaft.
- a tool holding cylinder e.g. a drill bit or a chisel - depending on the desired work to be performed and presently not shown - may be directly or indirectly attached.
- This rotating shaft 3 is configured for actual rotation in a quasi-stationary manner, which is to say that it is configured to cyclically perform full rotations with quasi-stationary rotation characteristics, examples for such rotation characteristics being rotational speed, angular velocity or angular acceleration.
- any component or shaft which is only configured for pivoting, in particular pivoting back and forth, e.g. a rotary switch, cannot be understood as rotating shaft 3 in the present sense.
- the rotating shaft 3 may be arranged within the drive train for a tooling of the hand-held power tool 1, as is the case in the present embodiment for the tool holding cylinder, but it may equally be arranged outside such a drive train.
- the hand-held power tool 1 is switchable to a first and second mechanical mode for driving the rotating shaft 3.
- Each such mechanical mode corresponds to a different mechanical configuration of the hand-held power tool 1 affecting the driving of the rotating shaft 3.
- there is some change in the mechanical state of the hand-held power tool 1 between the first and second mechanical mode which results in the rotating shaft 3 being driven differently by the hand-held power tool 1 in each mechanical mode.
- the hand-held power tool 1 may be switchable to more than two mechanical modes.
- the hand-held power tool 1 may be switchable to a mechanical mode defined by an analog value in a continuum, i.e. by a continuous value, preferably between two limits.
- One such example would be a continuously variable transmission of the hand-held power tool 1 for driving the rotating shaft 3, where each set gear ratio would correspond to a mechanical mode of the hand-held power tool 1.
- this feature only requires that there be a minimum of two mechanical modes, i.e. at least a first and second mechanical mode, which are mutually distinguishable by their associated mechanical configuration of the hand-held power tool 1.
- the proposed method for operating such a hand-held power tool 1 is characterized in that it comprises detecting a rotation movement characteristic of the rotating shaft 3 and determining an operational setting of the hand-held power tool 1 based on the detected rotation movement characteristic.
- An operational setting of the hand-held power tool 1 in the present sense may be any property or parameter value which is settable to one of a plurality of values and which determines the operation of the hand-held power tool 1 in anyway. This may correspond to that property or parameter value being settable to one of a discrete number of values or to an analog value in a continuum as described above with reference to the mechanical mode.
- the first mechanical mode which is preferably a drill mode, is for driving the rotating shaft 3 with a rotating movement.
- This rotating movement may be understood as a rotating movement with a first set of rotation movement characteristics, such as a rotational speed value, angular velocity value or angular acceleration value.
- the first mechanical mode may preferably also be a hammer drill mode for in addition driving the rotating shaft 3 with an axial movement, which is here a back and forth movement in the axial direction 4 of the rotating shaft 3.
- the second mechanical mode which is preferably a chiseling mode, is for driving the rotating shaft 3 with a further rotating movement or substantially stationary with respect to rotation.
- this further rotating movement may be understood as a rotating movement with a second set of rotation movement characteristics, e. g. a further rotational speed value, a further angular velocity value or further angular acceleration value.
- Driving the rotating shaft 3 substantially stationary with respect to rotation may also be formulated as there being substantially no driving of the rotating shaft 3 with respect to rotation around the axial direction 4 of the rotating shaft 3.
- the second mechanical mode in particular when the second mechanical mode is the chiseling mode, may also be for driving the rotating shaft 3 with an axial movement, i.e. a back and forth movement in the axial direction 4 of the rotating shaft 3.
- determining the operational setting comprises switching to a first or second electrical mode of the hand-held power tool 1.
- first and second mechanical modes are distinguished by a difference in the mechanical configuration of the hand-held power tool 1
- first and second electrical modes of the hand-held power tool 1 are distinguished by a respective difference in the electrical configuration of the hand-held power tool 1.
- the different electrical modes may correspond to analog values in a continuum as already described above with reference to the mechanical mode.
- the first and second electrical mode of the hand-held power tool 1 correspond to the first and second mechanical mode for driving the rotating shaft 3, respectively.
- switching to the first or the second mechanical mode for driving the rotating shaft 3 sets the hand-held power tool 1 to a different functionality.
- the hand-held power tool 1 is also set to the proper electrical mode corresponding to the mechanical mode the hand-held power tool 1 is set to.
- the detection of the rotation movement characteristic brings the electrical mode of the hand-held power tool 1 into alignment with the mechanical mode of the hand-held power tool 1. It follows that setting the mechanical mode of the hand-held power tool 1 precedes setting the electrical mode of the hand-held power tool 1.
- switching to the first electrical mode comprises setting a functional parameter for an electric function of the hand-held power tool 1 to a first parameter value.
- This functional parameter could be a number or other value supplied or written into an electronic unit or could also be for example an analog voltage supplied to a motor or some other electric component in the hand-held power tool 1.
- the functional parameter is an activation threshold of the electric function, i.e. a parameter for comparison, which comparison in turn is the basis for activating or deactivating the electric function.
- this electric function is a safety function, i.e. a function the activation of which is to ensure or improve the operational safety of the hand-held power tool 1.
- switching to the second electrical mode comprises setting the functional parameter for the electric function of the hand-held power tool 1 to the second parameter value.
- This second parameter value is preferably different from the first parameter value.
- the electric function would have a different activation sensitivity between the first electrical mode and the second electrical mode.
- the activation threshold may be set to one of the parameter values such that the electric function cannot be activated.
- switching to the first electrical mode comprises enabling the electric function and that switching to the second electrical mode comprises disabling the electric function.
- switching to the first electrical mode comprises enabling the electric function
- switching to the second electrical mode comprises disabling the electric function.
- the electric function cannot be activated according to this embodiment.
- such an electric safety function could be an anti-twist protection function.
- the functional parameter in the above sense defines a threshold value for activating the anti-twist protection function.
- a threshold value could also be a rotation movement characteristic in the above sense which in this case, however, would be a rotation movement characteristic of the hand-held power tool itself or of a fixed part of the hand-held power tool 1 such as a handle 1a of the hand-held power tool 1.
- the detected rotation movement characteristic is a rotational speed and/or an angular velocity and/or an angular acceleration of the rotating shaft 3In line with this consideration it is preferred that determining an operational setting of the hand-held power tool 1 based on the detected rotation movement characteristic comprises determining the operational setting based on a comparison of the detected rotation movement characteristic with a - preferably predefined - rotation movement characteristic threshold.
- This rotation movement characteristic threshold may in particular be the a rotational speed threshold and/or an angular velocity threshold and/or an angular acceleration threshold. Consequently, it is preferred that the anti-twist protection function is enabled if the detected rotation movement characteristic exceeds the above rotation movement characteristic threshold.
- a comparison of a detected rotational speed with a rotational speed threshold may indicate whether the current mechanical mode is a (hammer) drill mode or a chiseling mode.
- the activation threshold as a functional parameter of the anti-twist protection function is set to enable the anti-twist protection function and when no substantial rotational speed of the rotating shaft 3 is detected - which corresponds to the chiseling mode - the activation threshold as a functional parameter of the anti-twist protection function is set to disable the anti-twist protection function.
- the hand-held power tool 1 comprises a sensor arrangement 5 for detecting the rotation movement characteristic of the rotating shaft 3.
- the sensor arrangement 5 is preferably a Hall effect sensor arrangement, depicted in more detail in Fig. 2 .
- a first component 6a of the sensor arrangement 5 is arranged laterally with respect to the rotating shaft 3.
- this first component 6a is a probe, i.e. a component generating a detection signal.
- the lateral arrangement of the first component 6a with respect to the rotating shaft 3 simply means that the first component 6a is arranged with a distance to the rotating shaft 3 in the lateral direction, i.e.
- this first component 6a is non-rotatably arranged with respect to a casing 7 of the hand-held power tool 1. In other words, when the rotating shaft 3 rotates with respect to the casing 7 of the hand-held power tool 1, this first component 6a does not rotate together with the rotating shaft 3 but rather stays fixed to the casing 7 and there is a resultant relative movement between the rotating shaft 3 and the first component 6a.
- the sensor arrangement 5 comprises a second component 6b non-rotatably arrangeable with respect to the rotating shaft 3.
- the second component 6b can, at least, be brought into a state or position in which it is non-rotatable with respect to the rotating shaft 3.
- the second component 6b is already and fixedly in such a state or position. Therefore it is preferred that the second component 6b is non-rotatably arranged with respect to the rotating shaft 3.
- the second component 6b rotates together with the rotating shaft 3 if and when the rotating shaft 3 rotates.
- This second component 6b is preferably a magnetic field generator and - as illustrated in the present embodiment - a permanent magnet.
- the second component 6b and therefore also the permanent magnet need not consist of a single object but may be an arrangement of several subcomponents of the second component 6b.
- the second component 6b may comprise four magnet strips 8, as described in more detail below.
- the second component 6b need not be directly attached to the rotating shaft 3. Instead and as shown in Fig. 2 , the second component 6b can be arranged on a shaft cover 9 arranged axially slidable and non-rotatably arrangeable, preferably non-rotatably arranged, with respect to the rotating shaft 3.
- the shaft cover 9 may be any structure arranged or fixed on the rotating shaft 3 and is preferably, as in the present embodiment, a shaft sleeve 10, i.e. a structure surrounding the rotating shaft 3 around its circumference with respect to the axial direction 4 of the rotating shaft 3.
- the second component 6b is axially symmetric with regard to the rotating shaft 3.
- the second component 6b comprises a permanent magnet with four individual magnet strips 8.
- the magnet strips 8 are spaced at a relative angle of 90 degrees with respect to the axial direction 4 of the rotating shaft 3.
- Other relative angles between such magnet strips 8 are equally possible.
- the second component 6b is symmetric to a rotation by - in this example - 90 degrees of the rotating shaft 3 around its axial direction 4.
- Fig. 3 also illustrates that the second component 6b is rotationally asymmetric with regard to the rotating shaft 3. In other words, there exist rotations for which symmetry is not preserved.
- rotating the situation of Fig. 3a by e.g. 45 degrees would result in the arrangement of Fig. 3b , which is not identical to the arrangement of Fig. 3a .
- the first component 6a and the second component 6b are arranged on a sensing plane 11 which is defined axially with respect to the rotating shaft 3.
- the sensing plane 11 is a plane in the geometrical sense.
- a geometrical plane on which both the first component 6a and the second component 6b are arranged i.e. a plane that intersects both the first component 6a and the second component 6b, as can be seen from Fig. 2 . From the functioning of e.g. Hall effect sensors, it is evident that the interaction of the first component 6a and the second component 6b occurs strongest in the sensing plane 11.
- the arrangement of the first component 6a and the second component 6b on the sensing plane 11 is invariant with respect to sliding the shaft cover 9.
- the shaft cover 9 is slid in the axial direction 4 between the position of Fig. 2a and 2b , then the sensor arrangement 5 seen by the sensing plane 11, in particular the relative position of the first component 6a and the second component 6b, is invariant.
- the first component 6a does not slide axially, therefore being invariant, and also for the second component 6b the magnet strips 8 have an extension in the axial direction 4 which is sufficient, such that even after sliding the shaft cover 9, the portion of the magnet strips 8 seen by the sensing plane 11 is indistinguishable from the situation before sliding.
- the sensing arrangement 5 there is no discernible difference between the sliding positions of the shaft cover 9 and in fact such a sliding as such is not detectable by the sensing arrangement 5.
- the first and second mechanical mode correspond to a first axial position 12a and a second axial position 12b of the shaft cover 9 with respect to the rotating shaft 3.
- the first axial position 12a in the first mechanical mode moves to the second axial position 12b in the second mechanical mode.
- the difference between the first and second mechanical mode may comprise not only this different position of the shaft cover 9 in the axial direction 4, but may involve other differences in the mechanical configuration as well.
- the shaft cover 9 is arranged rotatable with respect to the rotating shaft 3 in either the first or second axial position 12a,b and non-rotatable in the respective other axial position 12a,b.
- Another example which does correspond to the embodiment illustrated will be explained in the following.
- the hand-held power tool 1 comprises a motor 13 for driving the rotating shaft 3 and that sliding the shaft cover 9 between the first axial position 12a and the second axial position 12b selectively engages and disengages the motor 13 with the rotating shaft 3 with regard to driving the rotating shaft 3 in a rotating movement.
- a motor 13 for driving the rotating shaft 3 and that sliding the shaft cover 9 between the first axial position 12a and the second axial position 12b selectively engages and disengages the motor 13 with the rotating shaft 3 with regard to driving the rotating shaft 3 in a rotating movement.
- sliding the shaft cover 9 axially, in particular between the first axial position 12a and the second axial position 12b, may provide the mechanism - as illustrated in Fig. 2a and 2b - of selectively engaging the motor 14 with the rotating shaft 3 for rotation.
- rear teeth 15a of the shaft sleeve 10 engage a bevel gear 16 driven by the motor 13 when the shaft cover 9, which is presently the shaft sleeve 10, is in the first axial position 12a as illustrated in Fig. 2a .
- the shaft sleeve 10 Since the shaft sleeve 10 is arranged non-rotatably with regard to the rotating shaft 3, the rotating movement imparted on the shaft sleeve 10 by the bevel gear 16 is transmitted to the rotating shaft 3. In contrast, the rear teeth 15a disengage the bevel gear 16 when the shaft cover 9 is in the second axial position 12b, which corresponds to the situation in Fig. 2b .
- the rotating shaft 3 which here is the tool holding cylinder, is non-rotatable in the chiseling mode. Therefore and as shown in Fig. 2a and 2b , sliding the shaft cover 9 to the second axial position 12b engages front teeth 15b of the shaft cover 9 with a corresponding structure of the casing 7, thereby fixing also the rotating shaft 3 against rotation. In the first axial position 12a, the front teeth 15b are disengaged from the casing 7 to enable rotation of the rotating shaft 3.
- the shaft cover 9 here combines the functions of housing the first component 6a of the sensor arrangement 5, of engaging the motor 13 with the rotating shaft 3 in the hammer drill mode and of fixing the rotating shaft 3 against rotation in the chiseling mode.
- the axial driving of the rotating shaft 3 by the motor 13 remains identical for both axial positions 12a, b of the shaft cover 9 because of the axial driving gear 14.
- the relative, effective internal constellation of the sensing arrangement 5, i.e. the relative position of the first component 6a to the second component 6b as detectable by the sensing arrangement 5, remains invariant to this sliding. Only when the motor 13 actually drives the rotating shaft 3 and thus the rotating shaft 3 is either rotated or not does the sensing arrangement 5 detect the difference.
- Fig. 3a-c illustrate by way of example how the sensor arrangement 5 may detect a rotating movement characteristic of the rotating shaft 3.
- Fig. 3a depicts a cross section view of the sensor arrangement 5 in the sensing plane 11 when the rotating shaft 3 - and with it the shaft cover 9 - does not rotate. Whether or not the rotating shaft 3 moves in the axial direction 4 is substantially irrelevant, due to the above-described invariance of the sensor arrangement 5 with respect to axial movement, for the detection of the sensor arrangement 5 described in the following.
- the first component 6a being the probe and facing a magnet strip 8 in the sensing plane 11, detects the magnetic field of the second component 6b, being the permanent magnet, with a high, constant value because the rotating shaft 3 does not rotate.
- the first detected signal 17a which is shown also in Fig. 3a as magnetic field 18 plotted over time 19, is constant.
- the rotating shaft 3 also does not rotate, but the first component 6a does not directly face any of the magnet strips 8 which are therefore set at an angle relative to the first component 6a.
- the magnetic field detected by the probe is also constant but, because the first component 6a does not directly face any of the magnet strips, that constant detected magnetic field is lower than in the case of Fig. 3a , shown in Fig. 3b as second detected signal 17b.
- Fig. 3c finally depicts the situation for a rotating shaft 3 actually driven to a rotating movement.
- the first component 6a alternatingly faces the magnet strips 8 rotating with the rotating shaft 3 as well as the intervals in between. Therefore, the magnetic field seen by the first component 6a and by the sensor arrangement 5 as a whole corresponds to a changing magnetic field, which may be approximated as a rectangular function - here shown as third detected signal 17c - or sinusoidal function in time.
- the periodicity of the sinusoidal function is indicative of the rotational speed and the angular velocity of the rotating shaft 3 and the change in periodicity is indicative of angular acceleration of the rotating shaft 3.
- any axial movement of the rotating shaft 3 is substantially irrelevant for the third detected signal 17c.
- the sensor arrangement 5 may detect a rotating movement characteristic of the rotating shaft 3.
- the hand-held power tool 1 comprises a user-actuatable mechanical switch 20 for switching between the first and second mechanical mode.
- This mechanical switch 20 may be any kind of component of the hand-held power tool 1 with which mechanical change can be effected by the user.
- that mechanical switch 20 may be a turning switch.
- the mechanical switch 20 is arranged to slide the shaft cover 9 between the first axial position 12a and the second axial position 12b, which in the present example and as already noted above also respectively engages and disengages the motor 13 with the rotating shaft 3 with regard to driving the rotating shaft 3 in a rotating movement.
- this sliding of the shaft cover 9 is effected with an eccentric pin 21.
- Actuating the mechanical switch 20 may also comprise further changes in the mechanical configuration of the hand-held power tool 1 not shown in the present example.
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- Percussive Tools And Related Accessories (AREA)
Claims (12)
- Procédé de fonctionnement d'une machine-outil portative (1), avec un arbre rotatif (3),la machine-outil portative (1) est commutable vers un premier et un deuxième mode mécanique pour l'entraînement de l'arbre rotatif (3),dans lequel le premier mode mécanique est destiné à l'entraînement de l'arbre rotatif (3) avec un mouvement de rotation, comme un mode de perçage et/ou un mode de marteau perforateur également avec un mouvement axial, et le deuxième mode mécanique est destiné à l'entraînement de l'arbre rotatif (3) avec un mouvement de rotation supplémentaire ou comme un mode de cisaillement avec un mouvement axial et sensiblement stationnaire par rapport à la rotation,dans lequel le procédé comprend la détection d'une caractéristique de mouvement de rotation de l'arbre rotatif (3) directement et la détermination d'un réglage opérationnel de la machine-outil portative (1) sur base de la caractéristique de mouvement de rotation détectée par le réglage dynamique d'un mode électrique résultant de la machine-outil portative sur base de la détection durant le fonctionnement réel,dans lequel le réglage dynamique du mode électrique résultant comprend la commutation vers un premier ou un deuxième mode électrique de la machine-outil portative (1), dans lequel les premier et deuxième modes électriques de la machine-outil portative (1) correspondent aux premier et deuxième modes mécaniques pour l'entraînement de l'arbre rotatif (3), respectivement,dans lequel la machine-outil portative (1) est un marteau combiné (2), etdans lequel la machine-outil portative comprend un commutateur mécanique actionnable par l'utilisateur (20) pour la commutation entre le premier et le deuxième mode mécanique, etdans lequel la commutation vers le premier mode électrique comprend le réglage d'un paramètre fonctionnel, de préférence un seuil d'activation, pour une fonction électrique, de préférence une fonction de sécurité électrique, de la machine-outil portative (1) à une première valeur de paramètre, de préférence en outre, dans lequel la commutation vers le deuxième mode électrique comprend le réglage du paramètre fonctionnel pour la fonction électrique de la machine-outil portative (1) à une deuxième valeur de paramètre, en particulier, dans lequel la commutation vers le premier mode électrique comprend l'activation de la fonction électrique et dans lequel la commutation vers le deuxième mode électrique comprend la désactivation de la fonction électrique.
- Procédé selon la revendication 1,
dans lequel la fonction électrique est une fonction de protection anti-torsion, de préférence, dans lequel le paramètre fonctionnel définit une valeur seuil pour l'activation de la fonction de protection anti-torsion. - Procédé selon la revendication 1 ou 2,
dans lequel la caractéristique de mouvement de rotation détectée est une vitesse de rotation et/ou une vitesse angulaire et/ou une accélération angulaire de l'arbre rotatif (3). - Procédé selon l'une des revendications 1 à 3,
dans lequel la détermination d'un réglage opérationnel de la machine-outil portative (1) sur base de la caractéristique de mouvement de rotation détectée comprend la détermination du réglage opérationnel sur base d'une comparaison de la caractéristique de mouvement de rotation détectée avec un seuil de caractéristique de mouvement de rotation, de préférence prédéfini. - Procédé selon l'une des revendications 1 à 4,dans lequel la machine-outil portative (1) comprend un agencement de capteur (5), de préférence un agencement de capteur à effet Hall, pour la détection de la caractéristique de mouvement de rotation de l'arbre rotatif (3), en particulier, dans lequel un premier élément (6a), de préférence une sonde, de l'agencement de capteur (5) est agencé latéralement par rapport à l'arbre rotatif (3), de manière encore plus préférée,dans lequel le premier élément (6a) est agencé de manière non rotative par rapport à un boîtier (7) de la machine-outil portative.
- Procédé selon la revendication 5,
dans lequel l'agencement de capteur (5) comprend un deuxième élément (6b), de préférence un générateur de champ magnétique, en particulier un aimant permanent, pouvant être agencé de manière non rotative, de préférence agencé de manière non rotative, par rapport à l'arbre rotatif (3), en particulier agencé sur un couvercle d'arbre (9), de manière encore plus préférée sur un manchon d'arbre (10) agencé de manière axialement coulissante et pouvant être agencé de manière non rotative, de préférence agencé de manière non rotative, par rapport à l'arbre rotatif (3). - Procédé selon la revendication 6,
dans lequel le deuxième élément (6b) est axialement symétrique par rapport à l'arbre rotatif (3), de préférence, dans lequel le deuxième élément est asymétrique en rotation par rapport à l'arbre rotatif (3). - Procédé selon la revendication 6 ou 7,
dans lequel le premier élément (6a) et le deuxième élément (6b) sont agencés sur un plan de détection (11) défini axialement par rapport à l'arbre rotatif (3), de préférence, dans lequel l'agencement du premier élément (6a) et du deuxième élément (6b) sur le plan de détection (11) est invariant par rapport au coulissement du couvercle d'arbre (9). - Procédé selon l'une des revendications 6 à 8,
dans lequel le premier et le deuxième modes mécaniques correspondent à une première position axiale (12a) et une deuxième position axiale (12b) du couvercle d'arbre (9) par rapport à l'arbre rotatif (3). - Procédé selon la revendication 9,
dans lequel la machine-outil portative (1) comprend un moteur (13) pour l'entraînement de l'arbre rotatif (3) et dans lequel le coulissement du couvercle d'arbre (9) entre la première position axiale (12a) et la deuxième position axiale (12b) engage et désengage sélectivement le moteur (13) avec l'arbre rotatif (3) par rapport à l'entraînement de l'arbre rotatif (3) dans un mouvement de rotation. - Procédé selon l'une des revendications 1 à 10,
dans lequel le commutateur mécanique (20) est agencé pour faire coulisser le couvercle d'arbre (9) entre la première position axiale (12a) et la deuxième position axiale (12b) lors de l'actionnement. - Machine-outil portative (1) pour la mise en œuvre du procédé selon l'une des revendications 1 à 11, dans laquelle la machine-outil portative (1) est un marteau combiné (2) et peut être commutée vers un premier et un deuxième mode mécanique pour l'entraînement d'un arbre rotatif (3),
dans lequel le premier mode mécanique est destiné à l'entraînement de l'arbre rotatif (3) avec un mouvement rotatif, comme un mode de perçage et/ou un mode de marteau perforateur également avec un mouvement axial, et le deuxième mode mécanique est destiné à l'entraînement de l'arbre rotatif (3) avec un mouvement rotatif supplémentaire ou comme un mode de cisaillement avec un mouvement axial et sensiblement stationnaire par rapport à la rotation, la machine-outil portative (1) comprenant- l'arbre rotatif (3) ;- un agencement de capteur (5) pour la détection de la caractéristique de mouvement de rotation de l'arbre rotatif (3) ; et- des moyens pour la détermination d'un réglage opérationnel de la machine-outil portative sur base de la caractéristique de mouvement de rotation détectée.
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EP13005286.3A EP2871029B1 (fr) | 2013-11-09 | 2013-11-09 | Procede pour faire fonctionner un outil electrique portatif et outil electrique portatif |
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EP13005286.3A EP2871029B1 (fr) | 2013-11-09 | 2013-11-09 | Procede pour faire fonctionner un outil electrique portatif et outil electrique portatif |
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Cited By (1)
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US20230086336A1 (en) * | 2020-03-03 | 2023-03-23 | Hilti Aktiengesellschaft | Apparatus for adjusting a chisel |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
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CN105415297A (zh) * | 2015-12-02 | 2016-03-23 | 江苏东成机电工具有限公司 | 手持式多功能电锤 |
DE102017202976A1 (de) * | 2017-02-23 | 2018-08-23 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Sensorik für einen Elektroschrauber zur Klassifizierung von Schraubvorgängen mittels eines Magnetfeldsensors |
EP4142982A4 (fr) | 2020-05-01 | 2024-05-15 | Milwaukee Electric Tool Corporation | Outil à percussion rotatif |
Citations (1)
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EP0018603A1 (fr) * | 1979-04-26 | 1980-11-12 | Black & Decker Inc. | Commande anti-recul pour un outil à moteur |
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GB9320181D0 (en) * | 1993-09-30 | 1993-11-17 | Black & Decker Inc | Improvements in and relating to power tools |
US6536536B1 (en) * | 1999-04-29 | 2003-03-25 | Stephen F. Gass | Power tools |
DE10033362A1 (de) * | 2000-07-08 | 2002-01-17 | Hilti Ag | Elektrohandwerkzeug mit Leerschlagabschaltung |
JP4440169B2 (ja) * | 2005-05-16 | 2010-03-24 | 株式会社マキタ | 電動打撃工具 |
JP5376392B2 (ja) * | 2008-02-14 | 2013-12-25 | 日立工機株式会社 | 電動工具 |
DE102009000129A1 (de) * | 2009-01-09 | 2010-07-15 | Robert Bosch Gmbh | Verfahren zum Einstellen einer Elektrowerkzeugmaschine |
JP5537055B2 (ja) * | 2009-03-24 | 2014-07-02 | 株式会社マキタ | 電動工具 |
JP5440766B2 (ja) * | 2009-07-29 | 2014-03-12 | 日立工機株式会社 | インパクト工具 |
JP5412249B2 (ja) * | 2009-11-19 | 2014-02-12 | 株式会社マキタ | 手持ち工具 |
DE102010043032A1 (de) * | 2010-10-28 | 2012-05-03 | Hilti Aktiengesellschaft | Steuerungsverfahren für eine Werkzeugmaschine und eine Werkzeugmaschine |
DE102011017579A1 (de) * | 2011-04-27 | 2012-10-31 | Hilti Aktiengesellschaft | Werkzeugmaschine und Steuerungsverfahren |
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EP0018603A1 (fr) * | 1979-04-26 | 1980-11-12 | Black & Decker Inc. | Commande anti-recul pour un outil à moteur |
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US20230086336A1 (en) * | 2020-03-03 | 2023-03-23 | Hilti Aktiengesellschaft | Apparatus for adjusting a chisel |
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