EP1785231A2 - Outil de vissage à régulation de vitesse de rotation et méthode de régulation de vitesse pour un outil de vissage - Google Patents

Outil de vissage à régulation de vitesse de rotation et méthode de régulation de vitesse pour un outil de vissage Download PDF

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Publication number
EP1785231A2
EP1785231A2 EP06023292A EP06023292A EP1785231A2 EP 1785231 A2 EP1785231 A2 EP 1785231A2 EP 06023292 A EP06023292 A EP 06023292A EP 06023292 A EP06023292 A EP 06023292A EP 1785231 A2 EP1785231 A2 EP 1785231A2
Authority
EP
European Patent Office
Prior art keywords
speed
screwdriver
trigger parameter
motor
tpx
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.)
Withdrawn
Application number
EP06023292A
Other languages
German (de)
English (en)
Other versions
EP1785231A3 (fr
Inventor
Thomas Scholl
Klaus Schmitz
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.)
C&E Fein GmbH and Co
Original Assignee
C&E Fein GmbH and Co
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
Application filed by C&E Fein GmbH and Co filed Critical C&E Fein GmbH and Co
Publication of EP1785231A2 publication Critical patent/EP1785231A2/fr
Publication of EP1785231A3 publication Critical patent/EP1785231A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers

Definitions

  • the invention relates to a screwdriver with speed control, with a motor for driving a tool drive shaft, and with a control device by means of which the speed of the motor is regulated, wherein the control device is designed to reduce the speed upon reaching a trigger parameter.
  • the invention further relates to a method for speed control of a screwdriver, in which the speed of the motor is monitored and the speed of the motor is lowered upon reaching a trigger parameter.
  • Such a screwdriver and such a method for speed control are from the DE 42 25 157 A1 known.
  • the well-known screwdriver is designed as an electric screwdriver for drilling screws having a drill bit and a threaded portion, wherein when screwing the threaded portion of the required torque and thus the power consumption of the motor increases, and wherein an electronic control for keeping constant and a controllable switch for controlling the speed of Motors are provided.
  • An electronic sensor is activated in response to the current consumption and actuates a switch, whereby the speed of the motor when screwing the threaded portion via an electronic control is reduced and kept constant.
  • the invention is therefore based on the object to provide a screwdriver and a method for speed control of a screwdriver, which on the one hand initially a quick tightening the screw is made possible and on the other hand to the end the screwing down the screwdriver is controlled so that the most accurate tightening torque is ensured for a screw. Deviations of the tightening torque between a hard and a soft screw should be as low as possible.
  • control device is derived from the speed derived value as a trigger parameter for reducing the speed.
  • the object of the invention is further achieved by a method for speed control of a screwdriver, in which the speed of the motor is monitored and upon reaching a trigger parameter, the speed of the motor is lowered, as a trigger parameter, the speed or derived from the speed Value is used.
  • a quick tightening of a screw connection is initially made possible, while a lower speed value is set when a specific trigger parameter, which is derived from the rotational speed, is reached.
  • a specific trigger parameter which is derived from the rotational speed
  • tightenings in the final phase can be tightened much more precisely than is the case with conventional screwdrivers, where the speed is reduced on the basis of the current consumption of the motor or possibly on the basis of the torque increase.
  • according to the invention can be minimized differences in the tightening torque of fittings, which result from differences between hard and soft screwing.
  • control device uses as a trigger parameter a speed change per unit time.
  • control device uses as a trigger parameter an angular velocity change per unit of time.
  • the screwdriver has according to a further embodiment of the invention, a speed sensor whose output signal is supplied to the control device.
  • the speed sensor can be designed, for example, as an incremental sensor with a light barrier (Hall element) of the like.
  • the control electronics are in any case designed for a digital control of the motor, the pulses recorded by the Hall element can be fed to a counter for simple further processing.
  • the screwdriver on a shutdown device for switching off the motor upon reaching a predetermined torque.
  • a clutch for separating the tool drive shaft from the drive is provided upon reaching a predetermined tripping parameter.
  • the motor when the trigger parameter is reached, the motor is regulated to a second speed, which is lower than the output speed.
  • the speed is controlled on reaching another trigger parameter to a further speed, which is lower than the previous speed.
  • control device is formed upon reaching the trigger parameter to reduce the speed to zero and the subsequent reversal of direction, followed by a further reversal of the direction of rotation.
  • Fig. 1 shows a representation of the torque and the speed over time for a screwing operation according to the invention.
  • the nutrunner After the engine has been switched on, the nutrunner first runs at an initial speed n0 at the first tightening of the screw connection with a relatively low torque. Starting from the initial speed n0, the speed n drops only slightly in phase I at the beginning of the screwing. The torque M increases in phase I only slightly linear.
  • Tpn a trigger parameter for switching to a lower speed
  • the speed of the screwdriver is reduced and then regulated to a value n1.
  • This speed value n1 is maintained in phase II, until the end of the screwing torque M increases up to a turn-off MA, resulting in the shutdown of the engine.
  • the torque in phase I initially rises to a certain value, followed by a greater increase towards the end of phase I.
  • the torque M increases in FIG Phase II then continue approximately linearly, but with a smaller increase than before, until finally the shutdown occurs when the torque limit MA is reached.
  • the speed n is kept approximately constant in the phase II and possibly decreases at the end of the screwing process due to the higher load, until finally the value 0 is reached by the torque shutdown.
  • FIG. 2 an inventive screwdriver is shown schematically and generally designated by the numeral 10.
  • the screwdriver 10 has a housing 12, which is designed pistol-shaped and at the lower end of a battery pack 16 is interchangeable added.
  • the housing 12 has a handle 14 on which the screwdriver 10 can be held and by means of a switch button 28 on and off.
  • a motor 18, a gear 20 and a clutch 22 are successively added.
  • the output side of the coupling is connected to a tool drive shaft 24, on which a tool holder 26 for receiving a tool, for example a bit, is provided.
  • the motor 18 drives the transmission 20.
  • the transmission 20 is finally coupled via the coupling 22 with the tool drive shaft 24.
  • the screwdriver 10 is controlled by a central electronic control device 30 which is received in the handle 14 and is connected via suitable lines to the battery pack 16, the shift key 28, the motor 18, the transmission 20 and optionally to the shut-off clutch 22.
  • a speed sensor in the form of a Hall element is also provided, which is also coupled to the control device 30 via suitable lines.
  • the transmission 20 may, as for example EP 0 320 723 B1 be known to be formed as a planetary gear and be provided with a torque shutdown.
  • switch 34 Upon reaching a certain torque coupled to the planetary gear 20 switch 34 is actuated via a rotating fork and leads to the shutdown of the motor 18.
  • To generate a restoring force may be provided a torsion spring rod. As soon as the torque exceeds a preset torque value, the restoring force of the torsion spring rod is overcome and the shift fork is twisted, which leads to the operation of the switch 34.
  • the release clutch 22 may be provided, on the connection between the tool drive shaft 24 and the gear 20 is released by disengaging the clutch 22 upon reaching a predetermined torque.
  • Such tripping couplings have long been known in the art, for example, on the DE 10 2004 011 068 B3 is referenced.
  • the clutch 22 can be monitored and a disengagement of a coupling half can be registered, which in turn can be used mechanically for actuating a switch.
  • the speed of the motor 18 is controlled digitally via the control device 30.
  • the speed of the Hall element 32 is provided which emits a pulse at each revolution of the motor shaft, which is supplied to a counter in the control device or control electronics 30. If the number of pulses emitted by the Hall sensor per unit of time remains the same, then the speed n of the motor 18 is constant. If the number of pulses per unit of time increases, the speed increases, but decreases per unit of time, so the speed n drops. The number of pulses per unit of time is used as a manipulated variable by the digital electronic control device 30. The screwdriver is operated with a load-dependent motor characteristic.
  • the engine is started. After a short time, an idling speed n0 comes on (step 42).
  • step 46 the speed drop dn per unit time dt is compared with a predetermined trigger parameter Tpn. As long as dn is less than the trigger parameter Tpn, step 44 is repeated. However, if dn is greater than or equal to Tpn, then in the following step 48, the rotational speed n is reduced until a predetermined lower value n1 is reached and maintained in step 50.
  • a subsequent step 52 the torque M is determined and checked in a further step 54, whether the torque M exceeds the predetermined tripping torque MA. As long as this is not the case, the torque is still monitored. As soon as the torque M reaches the triggering torque MA, the motor is stopped in the subsequent step 56.
  • steps 52 and 54 can also be combined in one step by, for example, as already explained above, a torque-dependent triggering switch 34 is actuated.
  • steps 44 to 50 can be repeated as often as desired in order to lower the rotational speed to a lower value, in each case after reaching a predetermined trigger parameter for dn, which can then be regulated. So can the speed value of a screwing in a row be lowered by successive speed levels until a predetermined minimum value of the speed is reached, which is maintained.
  • steps 44 to 50 could be used to a quasi-continuous speed reduction to a predetermined minimum value.
  • any value derived from the rotational speed can be used as the trigger parameter Tpx.
  • the change in the angular velocity per unit time d ⁇ / dt could be used as a trigger parameter. If a controlled speed n0 is required in the first bolting stage, the relative change in the control variable of the control unit can also be used as the trigger parameter Tpx.
  • FIG. 1 An alternative screwing operation according to the invention is shown schematically in FIG. 1
  • Phase II for certain fittings, is designed to first allow some screwing to set before final tightening takes place in Phase III.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Electric Motors In General (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
EP06023292A 2005-11-14 2006-11-09 Outil de vissage à régulation de vitesse de rotation et méthode de régulation de vitesse pour un outil de vissage Withdrawn EP1785231A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200510056264 DE102005056264A1 (de) 2005-11-14 2005-11-14 Schrauber mit Drehzahlregelung und Verfahren zur Drehzahlregelung eines Schraubers

Publications (2)

Publication Number Publication Date
EP1785231A2 true EP1785231A2 (fr) 2007-05-16
EP1785231A3 EP1785231A3 (fr) 2009-04-22

Family

ID=37752820

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06023292A Withdrawn EP1785231A3 (fr) 2005-11-14 2006-11-09 Outil de vissage à régulation de vitesse de rotation et méthode de régulation de vitesse pour un outil de vissage

Country Status (2)

Country Link
EP (1) EP1785231A3 (fr)
DE (1) DE102005056264A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2397258A2 (fr) 2010-06-18 2011-12-21 C. & E. Fein GmbH Visseuse
US9555554B2 (en) 2013-05-06 2017-01-31 Milwaukee Electric Tool Corporation Oscillating multi-tool system
DE102018201074A1 (de) * 2018-01-24 2019-07-25 Robert Bosch Gmbh Verfahren zur Steuerung eines Schlagschraubers

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007019409B3 (de) * 2007-04-23 2008-11-13 Lösomat Schraubtechnik Neef Gmbh Kraftschrauber
DE102007019408B3 (de) 2007-04-23 2008-11-27 Lösomat Schraubtechnik Neef Gmbh Kraftschrauber
DE102009047443B4 (de) 2009-12-03 2024-04-11 Robert Bosch Gmbh Handwerkzeugmaschine
DE102011017061B4 (de) * 2011-04-14 2015-12-31 Wiha Werkzeuge Gmbh Schraubendreher mit Drehmomentbegrenzung
DE102012108332A1 (de) * 2012-08-29 2014-03-06 Hs-Technik Gmbh Verfahren für die Regelung der Drehzahl eines Schraubwerkzeugs
DE102021208653A1 (de) 2021-08-09 2023-02-09 Robert Bosch Gesellschaft mit beschränkter Haftung Verfahren zur Steuerung einer Handwerkzeugmaschine

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4128427A1 (de) 1990-08-28 1992-03-12 Matsushita Electric Works Ltd Kraftgetriebene werkzeuge mit mehrstufiger festzieh-drehmoment-steuerung

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DE3222065A1 (de) * 1982-06-11 1983-12-15 Black & Decker, Inc. (eine Gesellschaft n.d.Ges.d. Staates Delaware), 19711 Newark, Del. Elektrisches handwerkzeug mit drehrichtungsumschaltung und drehmomentbegrenzung
DE3710512A1 (de) * 1987-03-30 1988-10-20 Bosch Gmbh Robert Schraubverfahren und schrauber zum automatischen anziehen von schrauben und/oder muttern
DE4225157A1 (de) * 1992-07-30 1994-02-03 Reich Maschf Gmbh Karl Elektroschrauber für Bohrschrauben
SE506118C2 (sv) * 1993-09-02 1997-11-10 Atlas Copco Tools Ab Metod för åtdragning av gängade förband till en önskad förspänningsnivå med hjälp av en manuellt manövrerad kraftmutterdragare innefattande en nedgängningsfas och en förspänningsfas, avkänning av momentmotståndet i förbandet samt avbrytande av rotationen vid uppnådd önskad förspänningsnivå
GB9320181D0 (en) * 1993-09-30 1993-11-17 Black & Decker Inc Improvements in and relating to power tools
DE4427452A1 (de) * 1994-08-03 1996-02-08 Bosch Robert Gmbh & Co Kg Schrauber und Verfahren zum Anziehen einer Schraubverbindung mittels des Schraubers
DE59605901D1 (de) * 1995-03-24 2000-10-26 Marquardt Gmbh Verfahren und Schaltungsanordnung zum Betrieb eines Elektromotors
DE19620782A1 (de) * 1995-06-03 1996-12-05 Volkswagen Ag Verfahren zur Herstellung einer Schraubverbindung und Vorrichtung hierfür
DE19524051A1 (de) * 1995-07-01 1997-01-02 Bosch Gmbh Robert Verfahren zur Herstellung einer Schraubverbindung
SE508963C2 (sv) * 1997-04-22 1998-11-23 Atlas Copco Tools Ab Metod för åtdragning av skruvförband
DE19845871A1 (de) * 1997-10-08 1999-04-15 Christoph Prof Dr Ing Hartung Verfahren und Vorrichtung zum Anziehen von Schrauben

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4128427A1 (de) 1990-08-28 1992-03-12 Matsushita Electric Works Ltd Kraftgetriebene werkzeuge mit mehrstufiger festzieh-drehmoment-steuerung

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2397258A2 (fr) 2010-06-18 2011-12-21 C. & E. Fein GmbH Visseuse
US20110308827A1 (en) * 2010-06-18 2011-12-22 Michael Kaufmann Power Screwdriver
DE102010024920A1 (de) 2010-06-18 2011-12-22 C. & E. Fein Gmbh Schrauber
EP2397258A3 (fr) * 2010-06-18 2014-05-07 C. & E. Fein GmbH Visseuse
US8985237B2 (en) * 2010-06-18 2015-03-24 C. & E. Fein Gmbh Power screwdriver
US9555554B2 (en) 2013-05-06 2017-01-31 Milwaukee Electric Tool Corporation Oscillating multi-tool system
US10137592B2 (en) 2013-05-06 2018-11-27 Milwaukee Electric Tool Corporation Oscillating multi-tool system
US10940605B2 (en) 2013-05-06 2021-03-09 Milwaukee Electric Tool Corporation Oscillating multi-tool system
US11724413B2 (en) 2013-05-06 2023-08-15 Milwaukee Electric Tool Corporation Oscillating multi-tool system
DE102018201074A1 (de) * 2018-01-24 2019-07-25 Robert Bosch Gmbh Verfahren zur Steuerung eines Schlagschraubers

Also Published As

Publication number Publication date
EP1785231A3 (fr) 2009-04-22
DE102005056264A1 (de) 2007-05-16

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