EP1907172B1 - Outil electrique, notamment machine a fileter sans fil - Google Patents

Outil electrique, notamment machine a fileter sans fil Download PDF

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Publication number
EP1907172B1
EP1907172B1 EP20060775730 EP06775730A EP1907172B1 EP 1907172 B1 EP1907172 B1 EP 1907172B1 EP 20060775730 EP20060775730 EP 20060775730 EP 06775730 A EP06775730 A EP 06775730A EP 1907172 B1 EP1907172 B1 EP 1907172B1
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EP
European Patent Office
Prior art keywords
electric motor
power tool
thread
handed rotation
electronics
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.)
Not-in-force
Application number
EP20060775730
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German (de)
English (en)
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EP1907172A1 (fr
Inventor
Peter Broghammer
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.)
Marquardt GmbH
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Marquardt GmbH
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Publication date
Application filed by Marquardt GmbH filed Critical Marquardt GmbH
Publication of EP1907172A1 publication Critical patent/EP1907172A1/fr
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Publication of EP1907172B1 publication Critical patent/EP1907172B1/fr
Not-in-force legal-status Critical Current
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/001—Gearings, speed selectors, clutches or the like specially adapted for rotary tools

Definitions

  • the invention relates to a method for operating a power tool according to the preamble of patent claim 1.
  • Such power tools are used as a thread cutting machine, drill, screwdriver o. The like., Which may be in particular a cordless power tool.
  • Battery and / or mains operated power tools which from the WO 02/078416 A1 , of the US 2005/0103510 A1 or the US 5 014 793 A are known, have an electric motor for driving a tool holder. Furthermore, the power tool is equipped with an actuator having a switch for switching on and / or off the power supply for the electric motor and a switch for the clockwise / counterclockwise rotation of the electric motor. In advanced equipment, the power tool has electronics for speed control and / or regulation of the electric motor and short-circuit braking for the electric motor.
  • cordless screwdrivers are very often used for cutting threads. For this purpose, a tap is then inserted into the tool holder. Especially with larger workpieces that can not be edited with a stand or bench drill with adapted tapping, the use of such a cordless screwdriver offers.
  • cordless screwdrivers for tapping has the disadvantage that the life of the switch for the clockwise / counterclockwise rotation due to wear of the electrical changeover contacts is achieved quickly by the frequent switching between clockwise and counterclockwise rotation of the electric motor. In chord mode, it may also happen that even then switched by the user when the electric motor is still rotating. This also leads to premature wear of the changeover contacts. Furthermore, the mechanical torque coupling is too inaccurate, which can lead to breakage of the tap by jamming or seizure. Conventional cordless screwdrivers are therefore only partially suitable for the Cutting threads. In particular, the life of the motor and the switching contacts of this cordless screwdriver is limited. The same disadvantages can also be observed with mains operated screwdrivers when they are used for thread cutting.
  • the invention has for its object to make the thread cutting with the battery and / or mains powered power tool more effective and safer.
  • the battery and / or mains-powered power tool suitable for threading should be further developed with regard to its service life.
  • Such a power tool forms a completely new generation of devices for the niche market of thread cutting.
  • the invention is based on a battery-operated power tool that has various electronic functions. Ideally, this is a power tool, which also functions as a conventional cordless screwdriver, namely screwing, drilling, right / left switching; Brake, speed control, shutdown o. The like. Has.
  • the power tool can be switched between manual and / or automatic operation.
  • Such a switching function offers the user the comfortable Possibility to operate the power tool automatically according to a given program. If desired, however, the user can also intervene manually in the process.
  • the automatic operation with regard to thread cutting proceeds as follows. As soon as the actuator on the power tool is pressed by the user, the motor runs forward in the pitch mode according to a preset characteristic, that is with a kind of ramp function, up to the ideal speed. This predefinable ideal speed varies, for example, according to the thread diameter and / or the material to be machined. Then the thread is cut by turning the tap in the clockwise direction with this ideal speed. When screwing in the number n of threads is counted, which is possible in a simple manner by means of the electronics.
  • the electric motor is automatically switched over to counterclockwise rotation.
  • the tap is turned out of the thread in the reverse direction, with the tap being moved at a higher speed in the left-hand rotation than in the clockwise rotation in order to increase the performance of the power tool for tapping.
  • unscrewing the tap is then counted on at least the number of threads. For safety's sake, however, it can be counted a little further, for example to n + 3 threads. If this number is reached, the electronics switch the Electric motor off automatically. This process ensures a fast yet safe and high quality automatic working cycle.
  • Manual operation is as follows. The user switches on and / or off the motor in this mode via the actuator. The speed is controlled by the user in the right direction over the actuation path of the actuator. Once the thread depth has been reached, the user switches to anti-clockwise rotation. If the preselected torque is exceeded, the machine switches off.
  • Extending is also an automatic chip breaking function by alternately forward and backward rotation according to the clockwise and counterclockwise rotation of the electric motor feasible.
  • the electric motor rotates, for example, one revolution forward, and then a little more than one revolution backwards.
  • a reverse rotation of about 1.4 turns has proven to be particularly effective.
  • the acceleration and / or deceleration of the electric motor is expediently carried out with a suitable characteristic in the manner of a ramp function.
  • the switch of the power tool according to the invention is in another embodiment to an electronic switch, in particular a Power semiconductor for contactless switching the polarity of the power supply for the electric motor has.
  • the switching on and switching of the power supply for the electric motor thus happens electronically, so that no contact wear can occur as before, which in turn increases the life of the power tool.
  • the power semiconductor can be controlled via an electronic circuit or electronics for switching, which can be done manually by the user and / or automatically in the presence of certain conditions.
  • the electronics can thus advantageously operate the power tool programmatically in automatic operation.
  • the switching can be triggered by means of a switching signal to the electronics. In manual operation, it makes sense that the switching signal is generated by a leading only a signal current auxiliary contact, which in turn can be actuated by means of an actuating element on the power tool by the user.
  • the electronic circuit for switching can additionally serve as electronics for controlling the electric motor, so that there are no additional costs.
  • the electronics have a microprocessor, which results in a very compact design control for the electric motor in the manner of a microprocessor control.
  • the electric motor is a brushless, electronically commutated (EC) electric motor that is particularly sturdy and durable.
  • EC electric motor is low maintenance, since an exchange of carbon brushes is eliminated.
  • a brushed motor may also be used for the power tool.
  • a power tool with a brushless DC (DC) motor is particularly suitable for the special thread cutting functions, since even a large part of the electronic components of the existing control can be used simultaneously for the electronics and / or the switch, so that a particularly cost-effective Solution is provided.
  • DC brushless DC
  • the system consisting of EC motor and EC control electronics, can be easily provided with both conventional punctures and with an extension to the auxiliary functions for threading.
  • the power tool on the one hand have a means for speed detection.
  • the power tool may have a means for torque detection.
  • the torque detection takes place by means of a current measurement. It is then possible to predetermine a maximum torque that can be set, for example, via an external switch, via a potentiometer or the like. Upon reaching the maximum torque then the electric motor is turned off. In a simple way, this adaptation to small or larger taps, different materials to be machined o. The like. Enables.
  • the advantages achieved by the invention are in particular that the on / off switching of Power tool and the switching between clockwise and counterclockwise for the power tool is made electronically. Therefore, no contact wear can occur, so that the life of the power tool is increased. In particular, as a further advantage when using an EC motor results in an additional increase in the life, since no brush wear occurs. Due to the very long service life of all components, the power tool can be used in multi-shift operation for a very long time as well as reliably and especially in the professional field.
  • Cost of implementing the invention At least a possibly higher price compared to conventional power tools is quickly compensated by the high life and high efficiency for the power tool.
  • the power tool according to the invention is used as a threading tool, very short cycle times can be achieved in automatic mode. In addition, the service life of the taps is increased. This allows the introduction of new cordless power tools on the market for the threading specialty.
  • the power tool is shorter ausgestaltbar.
  • the tap can also be used directly in the spindle, for example by means of a magnetic square recording, without using the drill chuck. This leads to a further shortening of the power tool, so that its handling is improved for the user.
  • Fig. 1 is a power tool 1 to see a housing 2, which in a known manner as a drill, screwdriver o. The like. Is used.
  • the power tool 1 is a cordless power tool which can be operated by means of a rechargeable battery 4 which can be inserted into the handle 3 on the housing 2.
  • Power tool 1 can be used as a thread cutting machine by a thread cutter 6 can be used in the tool holder 5 of the power tool 1.
  • the power tool 1 has an electric motor 7 for driving the tool holder 5 via a transmission 14.
  • the power tool 1 has an on / off switch 8 with a user operable, in Fig. 1 visible actuator 9.
  • the electric motor 7 is by means of an electronic circuit 12, hereinafter also referred to as electronics 12, operated.
  • the electronics 12, which includes a microprocessor and / or consists of a microprocessor, controls for the desired operation of the electric motor 7, an array of power semiconductors 13 for powering the electric motor 7 in the manner of a microprocessor control accordingly.
  • the switch 10 is designed as an electronic switch and has a power semiconductor for contactless switching the polarity of the power supply for the electric motor 7, wherein for this purpose the power semiconductor 13 for the Voltage supply of the electric motor 7 is used.
  • Fig. 1 visible actuator 11 which acts on a right / left switch 22.
  • the power semiconductor 13 is also used for switching on the electric motor 7.
  • the on / off switch 8 and the right / left switch 22 thus each comprise an auxiliary contact, which is connected to an input of the microprocessor 12.
  • the auxiliary contact 8, 22 is switched, thereby generating an on / off switching signal and / or a switching signal, so that the electronic circuit 12, the power semiconductor 13 for switching on / off and / or switching over. Since the switching on / off and / or the switching of the load current to the electric motor 7 is carried out electronically, therefore, no contact wear can occur. At the auxiliary contacts 8, 22, however, only a small, no significant wear causing signal current occurs.
  • the power tool 1 is further equipped with electronics for speed control and / or regulation of the electric motor 7, this electronics in turn being formed by the microprocessor 12.
  • the power tool 1 has a means for speed detection, wherein the detected at the electric motor 7 actual speed n is supplied to an input 15 of the microprocessor 12.
  • the target speed is specified in a known manner by the path of movement of the actuator 9 designed as a pusher by the user.
  • a short-circuit braking for the electric motor 7 is realized in the power tool 1.
  • the power tool 1 has a means for torque detection.
  • the torque detection can be done by means of a current measurement on the electric motor 7.
  • the measured current which corresponds to the actual torque, is supplied to an input 16 on the microprocessor 12.
  • the desired maximum torque can be specified by the user by means of an external switch, a potentiometer 17 or the like.
  • On the housing 2 is to adjust the potentiometer 17 is operated by the user, in Fig. 2 visible knob 18.
  • the electric motor 7 is then switched off by the microprocessor 12 via the power semiconductor 13.
  • the knob 18 thus allows an adaptation to small or larger taps, different materials o. The like., To achieve an optimal result when tapping.
  • the electric motor 7 is a brushless, electronically commutated (EC) electric motor which ensures a long-lasting, functionally reliable and low-maintenance power tool 1.
  • EC electronically commutated
  • the power tool 1 has a switching function between manual and automatic operation, which are explained in more detail below.
  • a switch 19 is arranged on the housing 2, as based on Fig. 2 you can see.
  • Another switch 20 is used to switch between drilling / screwing and tapping.
  • Yet another switch 21 is used to switch on the also discussed below chipbreaking function.
  • the run-up takes place with a kind of ramp function, that is, according to a predetermined characteristic, in order to avoid an overload.
  • the thread is cut by screwing the tap 6 in the clockwise direction of the electric motor 7.
  • the desired thread depth is reached, it automatically switches over to the counterclockwise rotation of the electric motor 7.
  • this also other conditions, for example, as soon as the tap 6 runs in a blind hole, as soon as the user releases the actuator 9 o. The like., Are used.
  • the tap 6 is rotated out of the thread again in reverse. To save time, this can be done at a higher speed.
  • the user switches by means of the actuating element 11 manually between clockwise and counterclockwise rotation of the electric motor 7.
  • the subsequent process ensures a particularly fast and nevertheless safe working cycle.
  • the number n of threads is counted, to which the microprocessor of the electronics 12 can be advantageously used.
  • unscrewing the tap 6 is counted on at least the number of threads. However, it can also be counted, for example, n + 3 threads, so that the thread cutter 6 is certainly completely unscrewed.
  • the electronics 12 is automatically switched off together with the electric motor 7.
  • An automatic chip breaking function which is particularly suitable for automatic operation, is realized in that the electric motor 7 is rotated alternately back and forth in accordance with its right and left rotation. For example, the electric motor 7 is rotated one revolution forward and then slightly more than one revolution backwards. The chip is then certainly broken. According to experiments carried out are particularly good results for the chipbreaker function achieved when the electric motor 7 is rotated in about 1.4 turns backwards.
  • the acceleration and / or deceleration of the electric motor 7 can in turn be carried out with a suitable ramp function or according to another characteristic in order to prevent an overload of the tap 6. This makes it possible to produce threads of particularly good quality.
  • the invention is not limited to the described and illustrated embodiment. Rather, it also encompasses all expert developments within the scope of the invention defined by the claims.
  • the invention is described with reference to a cordless power tool, it can also be used with power tools powered by mains voltage.
  • a power tool according to the invention is advantageous not only for thread cutting, especially in the professional field, but also for other machining tasks.

Claims (9)

  1. Procédé d'utilisation d'un outil électrique (1) pour le filetage, en particulier d'un outil électrique à accumulateur, comprenant un moteur électrique (7) destiné à entraîner un support d'outil (5) pour un taraud (6), comprenant un interrupteur (8) présentant un élément d'actionnement (9) destiné à activer et/ou à désactiver l'alimentation en tension pour le moteur électrique (7), comprenant un commutateur pour la marche à droite/à gauche du moteur électrique (7), comprenant un système électronique (12) pour la commande et/ou le réglage de la vitesse de rotation du moteur électrique (7), et comprenant également le cas échéant un freinage à court-circuit pour le moteur électrique (7), étant entendu qu'après l'actionnement de l'élément d'actionnement (9), le moteur électrique (7) démarre en marche à droite avec une sorte de fonction de rampe jusqu'à la vitesse de rotation idéale, étant entendu que le filet est ensuite découpé par l'engagement en rotation du taraud (6) en marche à droite, étant entendu que dès que la profondeur de filet est atteinte, dès que le taraud (6) rencontre un trou borgne, dès que l'utilisateur relâche l'élément d'actionnement (9) ou similaire, le moteur électrique (7) est commuté en marche à gauche, et étant entendu que le taraud (6) est ensuite à nouveau dégagé du filet en rotation en marche à gauche, caractérisé en ce que lors de l'engagement en rotation du taraud (6) en marche à droite, le nombre n de pas de filetage est compté au moyen du système électronique (12), en ce que la commutation du moteur électrique (7) en marche à gauche s'effectue automatiquement, en ce que le dégagement du taraud (6) en rotation en marche à gauche s'effectue à une vitesse plus élevée que l'engagement en rotation en marche à droite, en ce que lors du dégagement du taraud (6) en rotation en marche à gauche, on compte au moins le nombre de pas de filetage, par exemple n+3 pas de filetage, et en ce que lorsque ce nombre est atteint, le système électronique (12) arrête automatiquement le moteur électrique (7).
  2. Procédé selon la revendication 1, caractérisé en ce qu'une fonction de brise-copeau automatique est réalisée par le biais d'une rotation vers l'avant et vers l'arrière en alternance, correspondant à la marche à droite et à gauche du moteur électrique (7), par exemple, en ce que le moteur électrique (7) effectue une rotation vers l'avant, puis environ 1,4 rotation vers l'arrière, étant entendu que de préférence, l'accélération et/ou le freinage du moteur électrique (7) est réalisé avec une fonction de rampe appropriée.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que le convertisseur est un convertisseur électronique (10), qui présente en particulier un semi-conducteur de puissance (13) pour la commutation sans contact de la polarité de l'alimentation en tension pour le moteur électrique (7).
  4. Procédé selon la revendication 1, 2 ou 3, caractérisé en ce que le semi-conducteur de puissance (13) est commandé manuellement et/ou automatiquement par le biais d'un couplage électronique (12) pour réaliser la commutation, en ce que de préférence, la commutation est déclenchée au moyen d'un signal de commutation, et en ce que de façon encore plus préférée, le signal de commutation est produit, dans un mode de fonctionnement manuel, par un contact auxiliaire (22) qui peut en particulier être actionné au moyen d'un élément d'actionnement (11).
  5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que le moteur électrique (7) est un moteur électrique (CE) à commutation électronique sans balai.
  6. Procédé selon l'une des revendications 1 à 5, caractérisé en ce que le système électronique (12) destiné à la commutation sert également à la commande du moteur électrique (7) et en ce que le système électronique (12) possède de préférence un microprocessus, de telle sorte qu'il s'agit d'une commande à microprocesseur.
  7. Procédé selon l'une des revendications 1 à 6, caractérisé en ce que l'outil électrique (1) présente un moyen de détection de la vitesse de rotation.
  8. Procédé selon l'une des revendications 1 à 7, caractérisé en ce que l'outil électrique (1) présente un moyen de détection du couple, qui fonctionne en particulier au moyen d'une mesure de courant, en ce que de préférence, un couple maximal peut être prédéfini, par exemple, par le biais d'un interrupteur extérieur, d'un potentiomètre (17) ou similaire, et en ce que de façon encore plus préférée, le moteur électrique (7) est arrêté lorsque le couple maximal est atteint.
  9. Procédé selon l'une des revendications 1 à 8, caractérisé en ce que l'outil électrique (1) peut être commuté entre un mode de fonctionnement manuel et/ou automatique.
EP20060775730 2005-07-27 2006-07-21 Outil electrique, notamment machine a fileter sans fil Not-in-force EP1907172B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005035039 2005-07-27
PCT/DE2006/001273 WO2007012311A1 (fr) 2005-07-27 2006-07-21 Outil electrique, notamment machine a fileter sans fil

Publications (2)

Publication Number Publication Date
EP1907172A1 EP1907172A1 (fr) 2008-04-09
EP1907172B1 true EP1907172B1 (fr) 2015-05-20

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EP20060775730 Not-in-force EP1907172B1 (fr) 2005-07-27 2006-07-21 Outil electrique, notamment machine a fileter sans fil

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EP (1) EP1907172B1 (fr)
WO (1) WO2007012311A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008030813A1 (de) * 2007-07-04 2009-01-08 Marquardt Gmbh Ansteuereinrichtung für einen Elektromotor
CN102085648B (zh) * 2009-12-03 2014-09-10 奇力速工业股份有限公司 可侦测螺丝是否正确锁固的电动起子

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4540318A (en) * 1982-07-29 1985-09-10 Robert Bosch, Gmbh Rotary electrical tool with speed control, especially drill
US5014793A (en) * 1989-04-10 1991-05-14 Measurement Specialties, Inc. Variable speed DC motor controller apparatus particularly adapted for control of portable-power tools
US6536536B1 (en) * 1999-04-29 2003-03-25 Stephen F. Gass Power tools
DE10212721A1 (de) * 2001-03-24 2002-09-26 Marquardt Gmbh Ansteuereinrichtung für einen Elektromotor

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WO2007012311A1 (fr) 2007-02-01
WO2007012311A8 (fr) 2007-03-29
EP1907172A1 (fr) 2008-04-09

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