EP1930123A1 - Tournevis électrique - Google Patents

Tournevis électrique Download PDF

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Publication number
EP1930123A1
EP1930123A1 EP06125618A EP06125618A EP1930123A1 EP 1930123 A1 EP1930123 A1 EP 1930123A1 EP 06125618 A EP06125618 A EP 06125618A EP 06125618 A EP06125618 A EP 06125618A EP 1930123 A1 EP1930123 A1 EP 1930123A1
Authority
EP
European Patent Office
Prior art keywords
bit
reactive force
motor
electric screwdriver
bit holder
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.)
Granted
Application number
EP06125618A
Other languages
German (de)
English (en)
Other versions
EP1930123B1 (fr
Inventor
Koji Tatsuno
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.)
Uryu Seisaku Ltd
Original Assignee
Uryu Seisaku Ltd
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 Uryu Seisaku Ltd filed Critical Uryu Seisaku Ltd
Priority to DE200660010098 priority Critical patent/DE602006010098D1/de
Priority to EP20060125618 priority patent/EP1930123B1/fr
Publication of EP1930123A1 publication Critical patent/EP1930123A1/fr
Application granted granted Critical
Publication of EP1930123B1 publication Critical patent/EP1930123B1/fr
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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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

Definitions

  • the present invention concerns an electric screwdriver used for screw tightening work, etc. in the assembling processes of automobiles and electronic equipment, more specifically an electric screwdriver capable of reducing the reactive force produced on the occasion of a screw tightening work, etc.
  • an electric screwdriver is generally used for screw tightening work, etc. in the assembling processes of automobiles and electronic equipment (see JP2001-62745A , for example).
  • this type of electric screwdriver is realized, generally, by interposing a clutch mechanism between the motor as driving source for rotation and the bit holder holding the screwdriving bit so that, in case a load with a torque no lower than prescribed level is applied to the bit holder during a screw tightening work, said clutch mechanism may work to shut off the transmission of motive power to the screwdriving bit, and by further comprising a tightening torque control means for shutting the power application to the motor, as required, to be capable of accurately controlling the tightening torque.
  • the objective of the present invention realized in consideration of the above-described problems of the conventional electric screwdriver, is to provide an electric screwdriver capable of reducing the reactive force produced on the occasion of a screw tightening work, etc.
  • the electric screwdriver of the present invention is an electric screwdriver designed to transmit the rotational driving force of a motor to the bit through a bit holder, characterized in that it comprises a flywheel rotatively driven by a motor in the direction same as the direction of rotation of said bit holder, a brake generating a reactive force in the direction offsetting the reactive force transmitted from the bit to the body casing through the bit holder, by braking the flywheel, and a brake operating mechanism for operating said brake in response to the magnitude of the reactive force transmitted from the bit to the body casing through the bit holder.
  • the motor for rotatively driving the bit holder and the motor for rotatively driving the flywheel may be provided either individually or in common.
  • the driving of the motor may be made intermittently.
  • the electric screwdriver of the present invention it becomes possible to brake the flywheel by operating a brake by means of a brake operating mechanism, depending on the magnitude of the reactive force transmitted from the bit to the body casing through the bit holder, and generate a reactive force in the direction offsetting the reactive force, so as to reduce the reactive force produced on the occasion of a screw tightening work, etc.
  • This makes it possible to reduce the load applied to the worker holding the electric screwdriver, and improve the screw tightening accuracy, without changes in the holding state of the electric screwdriver by the worker, under the influences of reactive force, etc.
  • the motor for rotatively driving the bit holder and the motor for rotatively driving the flywheel may be provided either individually or in common, depending on the state of use of the electric screwdriver, etc.
  • Fig. 1 is a front sectional view showing the first embodiment of the electric screwdriver according to the present invention.
  • Fig. 2 is an explanatory drawing showing the control system for above.
  • Fig. 3 is an explanatory drawing showing the relationship between the reactive force F2 transmitted from the bit of above to the body casing through the bit holder and the reactive force F 1 in the direction offsetting it, Fig. 3 (a) indicating a case where the motor is rotatively driven once, and Fig. 3 (b) a case where the motor is submitted to an intermittent driving operation respectively.
  • Fig. 4 is a front sectional view showing the second embodiment of the electric screwdriver according to the present invention.
  • Fig. 5 is an explanatory drawing showing the control system for above.
  • Fig. 4 is a front sectional view showing the second embodiment of the electric screwdriver according to the present invention.
  • Fig. 5 is an explanatory drawing showing the control system for above.
  • Fig. 5 is an explanatory drawing showing the control system
  • FIG. 6 is an explanatory drawing showing the relationship between the reactive force F2 transmitted from the bit of above to the body casing through the bit holder and the reactive force F1 in the direction offsetting it, Fig. 6 (a) indicating a case where the motor is rotatively driven once, and Fig. 6 (b) a case where the motor is submitted to an intermittent driving operation respectively.
  • Fig. 7 is a front sectional view showing a modified example of the second embodiment of the electric screwdriver according to the present invention.
  • Fig. 1 to Fig. 3 indicate the first embodiment of the electric screwdriver according to the present invention.
  • This electric screwdriver is a electric screwdriver designed to transmit the rotational driving force of a motor M2 to the bit (not illustrated) through a bit holder 2, characterized in that it comprises a flywheel 3 rotatively driven by a motor M 1 other than said motor M2 in the direction same as the direction of rotation of the bit holder 2, a brake 4 generating a reactive force F1 in the direction offsetting the reactive force F2 transmitted from the bit to the body casing 1 through the bit holder 2, by braking this flywheel 3, and a brake operating mechanism 5 for operating the brake 4 in response to the magnitude of the reactive force F2 transmitted from the bit to the body casing 1 through the bit holder 2.
  • the motor M1 rotatively driving the flywheel 3 is driven and controlled by a controller C 1 and a driver D1, in response to the output signal of a torque sensor S 1 disposed at a proper position of the body casing 1.
  • the output signal of the torque sensor S1 is transmitted through the controller C1 to the brake operating mechanism (brake controller) 5, and the brake operating mechanism (brake controller) 5 operates the brake 4, depending on the magnitude of the reactive force F2, transmitted from the bit to the body casing 1 through the bit holder 2, detected by the torque sensor S1.
  • the operation of the brake 4 may be made by means of an optional urging mechanism such as electromagnet, etc.
  • the flywheel 3 is braked and it becomes possible to reduce the reactive force produced on the occasion of a screw tightening work, etc., by generating a reactive force F1 in the direction offsetting the reactive force F2 transmitted from the bit to the body casing 1 through the bit holder 2.
  • the motor M2 rotatively driving the bit holder 2 is driven and controlled by a controller C2 and a driver D2, in response to the output signal of a torque sensor S2 disposed at a proper position of the body casing 1.
  • the screw tightening operation is made, usually, in such a way as to drive the motor M2 rotatively driving the bit holder 2 once and, in response to this operation, drive the motor M1 rotatively driving the flywheel 3 once, and that the brake operating mechanism (brake controller) 5 operates the brake 4, depending on the magnitude of the reactive force F2, transmitted from the bit to the body casing 1 through the bit holder 2, detected by the torque sensor S1, as shown in Fig. 3 (a) .
  • the reactive force F1 in the direction offsetting the reactive force F2 transmitted from the bit to the body casing 1 through the bit holder 2 becomes short, in the case of a long tightening time or case in which a large torque is produced, etc.
  • Fig. 4 to Fig. 6 indicate the second embodiment of the electric screwdriver according to the present invention.
  • This electric screwdriver is an electric screwdriver designed to transmit the rotational driving force of a motor M to the bit (not illustrated) through a bit holder 2, characterized in that it comprises a flywheel 3 rotatively driven by a motor M common to said motor M in the direction same as the direction of rotation of the bit holder 2, a brake 4 generating a reactive force F1 in the direction offsetting the reactive force F2 transmitted from the bit to the body casing 1 through the bit holder 2, by braking this flywheel 3, and a brake operating mechanism 5 for operating the brake 4 in response to the magnitude of the reactive force F2 transmitted from the bit to the body casing 1 through the bit holder 2.
  • the motor M is driven and controlled by a controller C and a driver D, in response to the output signal of a torque sensor S disposed at a proper position of the body casing 1. Moreover, the output signal of the torque sensor S is transmitted through the controller C to the brake operating mechanism (brake controller) 5, and the brake operating mechanism (brake controller) 5 operates the brake 4, depending on the magnitude of the reactive force F2, transmitted from the bit to the body casing 1 through the bit holder 2, detected by the torque sensor S.
  • the flywheel 3 is braked and it becomes possible to reduce the reactive force produced on the occasion of a screw tightening work, etc., by generating a reactive force F1 in the direction offsetting the reactive force F2 transmitted from the bit to the body casing 1 through the bit holder 2.
  • This makes it possible to reduce the load applied to the worker holding the electric screwdriver, and improve the screw tightening accuracy, without changes in the holding state of the electric screwdriver by the worker, under the influences of the reactive force F2.
  • the motor M is connected to the bit holder 2 through a slide clutch 6, to thereby keep the bit holder 2 in an idling state, after making the tightening until the screw is sealed to make free running with the side clutch 6, on the occasion of a screw tightening work, etc.
  • a one-way clutch 7 is disposed between the outer circumferential face of the bit holder 2 and the inner circumferential face of the body casing 1. As a result, the reactive force (torque) F 1 generated with working of the brake 4 works as tightening torque through the one-way clutch 7.
  • various types of torque sensor such as strain gauge type sensor, magnetic strain gauge type sensor, etc. can be used as torque sensors S, S1, S2.
  • Said first embodiment and second embodiment use a strain gauge type sensor for the torque sensors S, S1, S2, while the modified example of the second embodiment of the electric screwdriver according to the present invention indicated in Fig. 7 uses a magnetic strain gauge type sensor for the torque sensor S.
  • the magnetic strain gauge type sensor is designed to detect changes in the magnetic permeability of the bit holder 2 provided with grooving Sb as changes in the output voltage of the detecting coil (proportional to the magnitude of the torque), by means of an exciting coil and a detecting coil Sa disposed in a way to turn around the bit holder 2.
  • the electric screwdriver according to the present invention capable of reducing the reactive force produced on the occasion of a screw tightening work, etc., can not only be used suitably for electric screwdrivers used for applications in which a large reactive force is generated during a screw tightening work or applications with a long time of screw tightening work, but also be widely used as electric driver used for applications in which a high screw tightening accuracy is required, etc., for example.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
EP20060125618 2006-12-07 2006-12-07 Tournevis électrique Expired - Fee Related EP1930123B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE200660010098 DE602006010098D1 (de) 2006-12-07 2006-12-07 Elektrischer Schraubenzieher
EP20060125618 EP1930123B1 (fr) 2006-12-07 2006-12-07 Tournevis électrique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20060125618 EP1930123B1 (fr) 2006-12-07 2006-12-07 Tournevis électrique

Publications (2)

Publication Number Publication Date
EP1930123A1 true EP1930123A1 (fr) 2008-06-11
EP1930123B1 EP1930123B1 (fr) 2009-10-28

Family

ID=37908114

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20060125618 Expired - Fee Related EP1930123B1 (fr) 2006-12-07 2006-12-07 Tournevis électrique

Country Status (2)

Country Link
EP (1) EP1930123B1 (fr)
DE (1) DE602006010098D1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015018555A1 (fr) * 2013-08-08 2015-02-12 Atlas Copco Industrial Technique Ab Outil motorisé muni d'un volant d'inertie et d'un engrenage permettant d'accélérer ledit volant d'inertie
US10099351B2 (en) 2013-08-08 2018-10-16 Atlas Copco Industrial Technique Ab Torque delivering power tool with flywheel
CN110116322A (zh) * 2018-02-05 2019-08-13 重庆工程职业技术学院 一种防废屑磨损数控机床主轴刹紧装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3331356A1 (de) * 1983-08-31 1985-03-14 Deutsche Gardner-Denver Gmbh, 7081 Westhausen Kraftbetriebenes werkzeug
JPH10109277A (ja) * 1996-10-03 1998-04-28 Nippon Electric Ind Co Ltd ねじ締め方法及びねじ締め装置
FR2777216A1 (fr) * 1998-04-14 1999-10-15 Ass Leonard De Vinci Machine porte-outils a entrainement rotatif sans reaction de couple
JP2001062745A (ja) * 1999-08-25 2001-03-13 Matsushita Electric Ind Co Ltd 電動ドライバ

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3331356A1 (de) * 1983-08-31 1985-03-14 Deutsche Gardner-Denver Gmbh, 7081 Westhausen Kraftbetriebenes werkzeug
JPH10109277A (ja) * 1996-10-03 1998-04-28 Nippon Electric Ind Co Ltd ねじ締め方法及びねじ締め装置
FR2777216A1 (fr) * 1998-04-14 1999-10-15 Ass Leonard De Vinci Machine porte-outils a entrainement rotatif sans reaction de couple
JP2001062745A (ja) * 1999-08-25 2001-03-13 Matsushita Electric Ind Co Ltd 電動ドライバ

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015018555A1 (fr) * 2013-08-08 2015-02-12 Atlas Copco Industrial Technique Ab Outil motorisé muni d'un volant d'inertie et d'un engrenage permettant d'accélérer ledit volant d'inertie
US10099351B2 (en) 2013-08-08 2018-10-16 Atlas Copco Industrial Technique Ab Torque delivering power tool with flywheel
CN110116322A (zh) * 2018-02-05 2019-08-13 重庆工程职业技术学院 一种防废屑磨损数控机床主轴刹紧装置

Also Published As

Publication number Publication date
EP1930123B1 (fr) 2009-10-28
DE602006010098D1 (de) 2009-12-10

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