EP1466702B1 - Control of a power tool - Google Patents

Control of a power tool Download PDF

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Publication number
EP1466702B1
EP1466702B1 EP20040101428 EP04101428A EP1466702B1 EP 1466702 B1 EP1466702 B1 EP 1466702B1 EP 20040101428 EP20040101428 EP 20040101428 EP 04101428 A EP04101428 A EP 04101428A EP 1466702 B1 EP1466702 B1 EP 1466702B1
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EP
European Patent Office
Prior art keywords
control
force
step
characterised
control method
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.)
Active
Application number
EP20040101428
Other languages
German (de)
French (fr)
Other versions
EP1466702A1 (en
Inventor
Harald Schmitzer
Hans Böni
Carlos Oliveira
Roland Schaer
Christoph Würsch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hilti AG
Original Assignee
Hilti AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to DE10316844 priority Critical
Priority to DE2003116844 priority patent/DE10316844A1/en
Application filed by Hilti AG filed Critical Hilti AG
Publication of EP1466702A1 publication Critical patent/EP1466702A1/en
Application granted granted Critical
Publication of EP1466702B1 publication Critical patent/EP1466702B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25DPERCUSSIVE TOOLS
    • B25D16/00Portable 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
    • B25D16/006Mode changers; Mechanisms connected thereto
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25DPERCUSSIVE TOOLS
    • B25D2211/00Details of portable percussive tools with electromotor or other motor drive
    • B25D2211/003Crossed drill and motor spindles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25DPERCUSSIVE TOOLS
    • B25D2250/00General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/195Regulation means
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25DPERCUSSIVE TOOLS
    • B25D2250/00General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/195Regulation means
    • B25D2250/201Regulation means for speed, e.g. drilling or percussion speed
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25DPERCUSSIVE TOOLS
    • B25D2250/00General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/221Sensors
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25DPERCUSSIVE TOOLS
    • B25D2250/00General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/255Switches
    • B25D2250/261Means for locking an operative switch on

Description

  • The invention refers to a control method of an at least partially rotating electric hand tool, such as a combination hammer.
  • Usually have electric hand tool machines on the workpiece side of a handle a regulator switch, which is usually associated with the index finger of a, the handle comprehensive, leading hand of the user. On actuation, this regulator closes the electrical circuit to the power supply via the electric motor and, on the other hand, controls an electronic regulation of the electric motor depending on the indentation depth.
  • The movement of the index finger in the operation of the workpiece side arranged on the handle pressure switch for activating the connection of the electric motor to the power source is intuitively correlated with the need to securely guide a rotating electric hand tool by the hand of the user gripping reflex to the handle and thus provides the readiness of the user Activation of the electric motor safely. However, the user must consciously control both the contact force of the electric hand tool machine to the ground and his finger position on the regulator switch during fine work. This requires on the one hand motor skills, on the other hand, a certain degree of concentration, which is not necessarily constantly given, especially in monotonous activities in the construction industry.
  • After DE19534850 a rotary electric hand tool has a regulator switch which closes the circuit via the electric motor to the power supply and activates a control electronics of the electric motor, which regulates the speed of the electric motor to a maximum reaction torque in response to a measured force on an internal sensor. In the US2001 / 0025421 as well as the DE19738092 After activation with the index finger operated regulator switch, the target rotational speed of the control of the electric motor is deliberately changed as a function of a force measured on a force sensor accessible with the thumb. Intuitively given by the handling of the electric hand tool machine itself control commands are not taken into account by such regulations.
  • After DE4401664 has a rotating and beating electric hand tool on a different depending on the selected operating mode control of the electric motor.
  • After W00219048 has a rotating and beating electric hand tool a depending on the selected mode of optimal control of the operating condition with respect to speed, impact frequency and contact pressure by many sensory parameters, including the forces acting on the electric hand tool, forces are evaluated in a learning process analysis. This optimization is done exclusively in maximizing the drilling progress.
  • After DE10034359 For example, a beating electric hand tool for controlling the impact amplitude has a contact force sensor. After DE4306524 For example, a rotating electric hand-held power tool has a contact pressure sensor which controls the speed or the torque intuitively by pressure via a control. The automatic activation which has taken place after being set down via a minimum pressure can lead to a rotation of the electric hand tool machine that is unexpected for the user. Furthermore, a pressure-dependent control is undesirable for many applications in the construction industry, for example. Color mixing, can sinking, borehole extenders.
  • After US5014793 a rotating electric hand tool on the workpiece side of a handle on a motionless trigger switch with force sensor, which activates the automatic speed control after an initial operation by the index finger, which depends on the force of the index finger on the trigger switch. The force applied via the index finger presupposes a motor control of the user, which does not correlate intuitively with the handling of the electric hand tool machine.
  • After DE10117123 For example, an electric power tool has a partially rotationally driven tool holder for a tool and a pressure switch on the handle for activating the electric motor, which is connected to a control electronics, which is connected to a force sensor. The force sensor is arranged between the tool holder and the handle and designed for measuring a contact force of the electric hand tool against a workpiece.
  • Next describes the DE10117123 a control method for such a power hand tool having a first at least partially a tool holder for a tool rotating operating mode, wherein in a first step by actuation of the handle arranged pressure switch, the control is activated, which in a second step, the electric motor depending on a measured by a force sensor Force controls. The force is correlated with the contact force of the electric hand tool against the workpiece. If the force sensor detects a parameter for an idling position, the electric motor and thus the impact mechanism are actively decelerated via a motor control unit, so that the striking mechanism comes to a standstill.
  • The object of the invention is to realize a secure, intuitive control of an at least partially rotating electric hand tool.
  • The object is essentially achieved by the features of the independent claim. Advantageous developments emerge from the subclaims.
  • In a first step at least partially rotating operating mode associated control method is activated in a first step by pressing the pressure switch s, which controls the electric motor in a second step depending on a force measured by the force sensor, which correlates with the contact pressure of the electric hand tool against the workpiece is.
  • In the second step, the controller always controls the electric motor above a minimum speed, which is optionally dependent on the operating mode, whereby the activity of the controller by a movement of the tool is reliably recognizable to the user.
  • By separate from the intuitive control of the electric hand tool machine via the contact force activation of the control by pressing the pressure switch the required readiness of the user for safe guidance of a rotating electric hand tool machine is detected.
  • Advantageously, in the second step, the sensitivity of the controller with respect to the force measured by the force sensor depending on an activation period of the second step, further advantageous degressive with respect to the activation period, whereby the electric hand tool machine in an optimum for tapping operation mode << LowPowerDrilling >> sensitive to the contact pressure.
  • Advantageously, in a negative force measured by the force sensor in the second step, the controller controls the electric motor in proportion to the amount of the negative force, whereby the pulling force required to pull the tool out of the workpiece causes a rotary drive to prevent jamming of the tool.
  • Advantageously, the control is disabled in a third step in discharge of the pressure switch, whereby the control is terminated intuitively when the clasping of the leading hand loosens around the handle.
  • Advantageously, in a selected by the mode selector second mode of operation in the second step, the electric motor is controlled independently of the force measured by the force sensor, which is particularly advantageous for a mode << Highspeed >> at maximum speed.
  • Advantageously, in a non-rotating second operating mode in the first step, the activation of the control by, in a trigger period of a maximum of 0.5 s, triggering actuation / discharge of the pressure switch, whereby the activation takes place via a click and thus no longer during the second step of the pressure switch must be permanently operated and thus in particular the index finger in the operating mode << Meisensein >> is relieved.
  • Advantageously, in a non-rotating second operating mode in the third step by a first step alternately repeated triggering operation of the pressure switch over a period of a maximum of 0.5 s, the control is disabled, whereby the operating mode << chisel >> is terminated intuitively by a repeated click.
  • Alternatively, in a non-rotating second operating mode, activation of the control in the first step occurs at a measured force peak greater than an activation force, advantageously within a trigger period of less than 0.5 s, whereby a << kickstart >> is realized in the operating mode << chisel >> ,
  • Advantageously, in a non-rotating second operating mode in the third step, the control is disabled if the measured force is always less than a minimum force over an idle period, thereby providing an intuitive shutdown in this mode << TimeOut >> takes place, which shuts off the generation of blows, especially in a beating operating mode. An otherwise necessary to prevent leaks impact control, which was usually realized mechanically over a sufficiently long switching path of the striking element, can thus be omitted.
  • An at least partially rotating electric hand tool with a tool holder for a tool has a workpiece side arranged on a handle, advantageously this workpiece side only partially covering, pressure switch for activating the connection of a power source with an electric motor, which is connected to an electronic control unit, which is connected to a force sensor is, which is designed and suitably arranged between the tool holder and the handle for measuring a contact force of the electric hand tool machine against a workpiece.
  • By means of the force sensor which is designed to measure the contact pressure against a workpiece, the controller is also intuitively reliably correlated with the handling of the electric hand-held power tool when the electric motor is intuitively safely activated via the grip flex.
  • The pressure switch is designed as a discrete switch, whereby its discrete switching states can be used directly to control the control electronics.
  • The control electronics are controllably connected to a mode selector switch, whereby various control programs can be selected by the control electronics in the case of operating modes that are selected differently.
  • The electric hand tool has an axially limited movable impact element, which is at least axially displaceable with respect to the tool holder, which mediated by the Anpresskraftabhängige control enabled dispensing with an otherwise necessary mechanical impact shutdown over a switching path of the impact element greater than 1 mm, the axial play in the tool holder is reduced and thus a more precise attachment and working in the operating modes << drill bits >> and << chisels >> is made possible.
  • The invention will be explained in more detail with respect to an advantageous embodiment with:
    • Fig. 1 as a scheme, showing the electric handheld power tool
    • Fig. 2 as a block diagram, showing the control;
    • Fig. 3 as a flow diagram, showing the control method,
    • Fig. 4a - 4f as diagrams, showing the control functions
  • To Fig. 1 has a partially rotating and beating electric hand tool 1 with a tool holder 2 for a tool an axially limited movable striking element 3, which is axially displaceable with respect to the tool holder 2 by only 0.5 mm. On the workpiece side on a handle 4, this only partially covering, arranged in the form of a Potentiometerschalters a pressure switch 5 for activating the connection of a power source 6 in the form of the power supply network with a driving electric motor 7. A for measuring a contact force F of the electric hand tool 1 against a workpiece suitable force sensor 8 is disposed between the tool holder 2 and the handle 4. Via an externally operable mode selector 9, which is connected to an electronic control unit 10 for the electric motor 7, the different operating modes I - VI of the electric hand tool 1 can be selected, which the functions << drill chisels >>, << LowPowerDrilling >>, << Highspeed >>, << Meissein >>, << Chisels - TimeOut >>, << Chisels - Kickstart >>.
  • To Fig. 2 is in the circuit between the power source 6 and the electric motor 7, an electronic control unit 10 (including controller 11 / control 12 / power electronics 13) arranged controllably connected to the pressure switch 5, the force sensor 8 and the mode selector switch 9. The normalized control function OV = f (PM, CF, FS, t) stored in the memory of the control electronics 10 embodied as a microcontroller for controlling the control of the speed n of the electric motor 7 is a function f of the normalized control parameters PM, CF, FS, t with:
    • PM: Control parameters of the pressure switch 5
    • CF: Contact force parameters of the force sensor 8
    • FS: Function parameters of the mode selector switch 9
    • t: time
  • To Fig. 3 is monitored in the rotating and beating operating mode I << drill bits >> with the function parameter FS: I by the control electronics in a three-step control method in a first step, the control parameter PM, which changes by pressing the discrete pressure switch. When activated by PM = 1, the intuitive control OV = max (CF, IS) is activated. In a subsequent second step, the speed control of the electric motor is controlled proportionally to the pressing force parameter CF, but at least proportionally to the standardized idling parameter IS with a control function OV. After relieving the pressure switch by PM = 0, the intuitive control is ended in the subsequent third step and returned to the entry point of the control method for FS: I.
  • After the Fig. 4a to 4f For various functional parameters FS of the operating modes I-VI, the control functions OV = f (PM, CF, t) are shown.
  • To Fig. 4a in the operating mode I << drill bits >> the control is activated as long as the control parameter PM signals an actuation of the pressure switch. When the intuitive control is activated, the control function OV follows, independent of the time t, proportionally to the pressing force parameter CF, wherein an idling parameter IS associated with the minimum rotational speed of 50 rpm in the operating mode I << drill bits >> is not undershot as the lower limit value. In a time range Δt of a negative threshold negative force CF <0 measured by the force sensor, the electric motor is controlled in proportion to the amount of this negative force.
  • To Fig. 4b In operating mode II << LowPowerDrilling >> in a time range Δt, the sensitivity of the control function OV increases progressively through the contact force parameter CF with the activation period of the second step, with the lower speed assigned to the minimum speed of 60 rpm in << LowPowerDrilling >> operating mode Limit value is not fallen below.
  • To Fig. 4c is in pure rotating mode III << Highspeed >> in the second step, the control function OV regardless of the time t and the Anpresskraftparameter CF constantly near a, a high speed of 1000 rpm associated upper limit.
  • To Fig. 4d takes place in the pure beating operating mode IV << Meissein >> the activation / deactivation of the intuitive control by the control function OV each by a triggernde actuation of the control parameter PM with a click within 0.5 s, in which case the control function OV proportional to the contact force parameter CF, but at least to Idle parameter IS is.
  • To Fig. 4e In the purely beating operating mode V << chisel - TimeOut >> alternatively the activation of the intuitive control by the control function OV by a triggernde operation of the control parameter PM with a click within 0.5 s, the deactivation, however, after falling below a, the idle rate associated, lower threshold by the pressing force parameter CF over a time range Δt.
  • To Fig. 4f In the purely beating operating mode VI << chisel - kickstart >> alternatively the activation is independent of the control parameter PM by briefly exceeding the contact force parameter CF of a, an activation force peak associated upper threshold within 0.5 s. Deactivation takes place after the undershooting of a lower threshold, which is assigned to the blank, by the contact force parameter CF over a time range Δt.

Claims (10)

  1. Control method for an electric machine tool (1) with a first operating mode (I) at least partly turning a tool holder (2) for a tool, in which in a first step the control is activated by operating a pressure switch (5) arranged on a handle (4) on the work piece side, which in a second step controls an electric motor (7) depending on a force measured by a force sensor (8), in which the force is correlated with the contact pressure (F) of the electric machine tool (1) against the work piece, characterised in that in the second step the control always controls the electric machine tool (7) above a minimum speed.
  2. Control method according to claim 1, characterised in that in the second step the sensitivity of the control with reference to the force measured by the force sensor (8) depends on an activation period of the second step, particularly increases progressively.
  3. Control method according to claim 1, characterised in that the minimum speed depends on the operating mode (I, II).
  4. Control method according to one of claims 1 to 3, characterised in that in the second step the control controls the electric motor depending on the amount of negative force, when a negative force is measured by the force sensor.
  5. Control method according to one of claims 1 to 4, characterised in that in a third step the control is deactivated when the pressure switch (5) is released.
  6. Control method according to one of claims 1 to 5, characterised in that in the second step the electric motor (7) is controlled independently of the force measured by the force sensor (8), when a second operating mode (III) is selected by the mode selection switch (9).
  7. Control method according to one of claims 1 to 6, characterised in that in the first step the control is activated by a triggering operation/release of the pressure switch (5) in a triggering period of less than 0.5 s, when in a non-turning second operating mode (IV, V).
  8. Control method according to claim 7, characterised in that the control is deactivated over a maximum period of 0.5 s through repeated triggering operation of the pressure switch (5) alternating with the first step.
  9. Control method according to one of claims 1 to 6, characterised in that the control is activated, optionally within a triggering period of less than 0.5 s, when a peak in force greater than the activation force is measured by the force sensor (8) when in a non-turning second operating mode (VI) in the first step.
  10. Control method according to claim 9, characterised in that in the third step the control is deactivated, if the measured force is constantly less than the minimum force in an idling period.
EP20040101428 2003-04-11 2004-04-07 Control of a power tool Active EP1466702B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE10316844 2003-04-11
DE2003116844 DE10316844A1 (en) 2003-04-11 2003-04-11 Control of an electric hand machine tool

Publications (2)

Publication Number Publication Date
EP1466702A1 EP1466702A1 (en) 2004-10-13
EP1466702B1 true EP1466702B1 (en) 2008-10-01

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Family Applications (1)

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EP20040101428 Active EP1466702B1 (en) 2003-04-11 2004-04-07 Control of a power tool

Country Status (4)

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US (1) US20040200628A1 (en)
EP (1) EP1466702B1 (en)
JP (1) JP4750370B2 (en)
DE (2) DE10316844A1 (en)

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Also Published As

Publication number Publication date
JP4750370B2 (en) 2011-08-17
DE502004008130D1 (en) 2008-11-13
DE10316844A1 (en) 2004-11-04
US20040200628A1 (en) 2004-10-14
EP1466702A1 (en) 2004-10-13
JP2004314298A (en) 2004-11-11

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