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US20060194528A1 - Rotary work tool with orbiting planetary gears containing eccentric axes for the attachment of polishing or sanding platens - Google Patents

Rotary work tool with orbiting planetary gears containing eccentric axes for the attachment of polishing or sanding platens Download PDF

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Publication number
US20060194528A1
US20060194528A1 US10/550,918 US55091805A US2006194528A1 US 20060194528 A1 US20060194528 A1 US 20060194528A1 US 55091805 A US55091805 A US 55091805A US 2006194528 A1 US2006194528 A1 US 2006194528A1
Authority
US
United States
Prior art keywords
axis
work tool
planetary gear
planetary gears
gear
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.)
Abandoned
Application number
US10/550,918
Other languages
English (en)
Inventor
Philip Rawlins
Matthew Carr
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.)
Technology Partnership PLC
Original Assignee
Technology Partnership PLC
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 Technology Partnership PLC filed Critical Technology Partnership PLC
Publication of US20060194528A1 publication Critical patent/US20060194528A1/en
Assigned to TECHNOLOGY PARTNERSHIP PLC reassignment TECHNOLOGY PARTNERSHIP PLC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CARR, MATTHEW JOHN, RAWILINS, PHILIP JOHN
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
    • B24B7/10—Single-purpose machines or devices
    • B24B7/18—Single-purpose machines or devices for grinding floorings, walls, ceilings or the like
    • B24B7/186—Single-purpose machines or devices for grinding floorings, walls, ceilings or the like with disc-type tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
    • B24B23/03—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor the tool being driven in a combined movement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/04—Headstocks; Working-spindles; Features relating thereto
    • B24B41/047—Grinding heads for working on plane surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B47/00—Drives or gearings; Equipment therefor
    • B24B47/10—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces
    • B24B47/12—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces by mechanical gearing or electric power

Definitions

  • This invention relates to worktools and, in particular, rotating worktools, such as sanders and polishing machines, that engage with a surface.
  • Known orbital and random-orbital worktools such as sanders, functioned by driving an abrasive surface in a circular path about a principal drive shaft.
  • a surface may be of fixed orientation or may be free to rotate about an eccentric axis, according to whether the resulting motion is required to be orbital or random-orbital respectively.
  • Such worktools typically suffer from vibration. Vibration in such systems has two distinct components, dynamic (which results from unbalanced centripetal acceleration) and frictional (which results from the translating frictional forces between the working surface of the tool and the work piece).
  • Dynamic imbalance can normally be corrected by distributing counter weights at particular axial, radial and phase positions on the drive axis of the work tool.
  • this approach relies on the working surface of the tool, such as the sanding platen and any attached replacement component, being of constant mass. This means that changing the platen or replacing the working material can often cause unwanted vibration.
  • Vibration experienced in use also often arises from translating frictional forces between the abrasive surface acting so as to make the eccentric drive axis the centre of rotation. In the worst case, these vibrations can be of an amplitude equal to the shaft eccentricity, in the case that the principal drive shaft orbits the stationary eccentric shaft.
  • Frictional vibration increases with increasing contact force, resulting in a reduction of sanding efficiency that tends to zero as the amplitude of vibration tends to the eccentricity of the drive axis.
  • a common misconception is that, by increasing the contact force, an increase in the material removal rate can be achieved. As such, counter-intuitive system behaviour in prior art solutions often results in poor sanding efficiency and high levels of vibration.
  • the present invention aims to reduce markedly vibration arising from translating frictional forces, by ensuring that such forces are reacted within a system of sanding surfaces, thereby increasing the sanding efficiency and the rate of material removal that can be achieved.
  • a work tool comprising: a principal drive shaft with a sun gear attached thereto; at least two planetary gears distributed about the circumference of the sun gear at substantially equal angular separation; and a carriage for constraining the planetary gears such that they maintain their angular separation about the axis of the principal drive shaft, wherein each planetary gear has an eccentric axis in addition to its rotational axis constrained by the carriage, such that each planetary gear can drive, in use, a platen around the respective eccentric axis.
  • phase difference between the rotation of the eccentric axis of any two adjacent planetary gears about the respective rotation of axis is 2 ⁇ /n radians, wherein n equals the number of planetary gears. n is preferably greater than or equal to 3. This relationship ensures that the centre of mass of the combined system does not depart from the principal axis of rotation.
  • the rotation of the eccentric axis of a first planetary gear about its associated rotational axis has a phase difference in a clockwise direction of 2 ⁇ /N relative to the rotation of the eccentric axis of a second planetary gear about its associated rotational axis, the second planetary gear being adjacent the first planetary gear in a clockwise direction.
  • a worktool comprising: a principal drive shaft with a sun gear attached thereto; n planetary gears distributed about the circumference of the sun gear at substantially equal angular separation; and a carriage for constraining the planetary gears such that they maintain their angular separation about the axis of the principal drive shaft; wherein each planetary gear has an eccentric axis in addition to its rotational axis constrained by the carriage, such that each planetary gear can drive, in use, a platen around the respective eccentric axis, and wherein the rotation of the eccentric axis of a first planetary gear about its associated rotational axis has a phase difference in a clockwise direction of 2 ⁇ /n relative to the rotation of the eccentric axis of a second planetary gear about its associated rotational axis, the second planetary gear being adjacent to the first planetary gear in a clockwise direction.
  • the arrangement of sanding elements is dynamically balanced, removing the need for the system of counter weights, in conventional sanders.
  • the sanding platens and abrasive surfaces can also be replaced without unduly compromising the dynamic balance.
  • the present invention can be configured to be operable in a number of modes, optimising the motion for a given sanding operation or spatial constraint.
  • the platens may be freely rotating or partially constrained from rotating with respect to the carriage, thereby fixing the orientation of the platens with respect to one another. Partially constraining the platens in this way permits the use of tessellating platen configurations.
  • the worktool may be a sander or a polisher.
  • the principal drive shaft may be connected, optionally through an additional gear mechanism, to an electric motor.
  • FIGS. 1 and 2 are isometric and plan views of a worktool according to the present invention.
  • FIG. 3 is a plan view of a device according to the present invention, with an additional gear shown;
  • FIG. 4 is a plan view showing alternative configurations of the platen only.
  • FIG. 5 shows the phase relationship between the rotation of the eccentric axis in a preferred example of the present invention.
  • the worktool includes a principal drive shaft 1 and a carriage 4 to which a sun gear 2 is attached.
  • the worktool is typically a sander or polisher.
  • a number of planetary gears 3 are distributed about the circumference of the sun gear 2 at equal angular separations.
  • the planetary gears 3 are constrained by the carriage 4 , locating the centres and maintaining the angular separation about the principal axis of the drive shaft 1 .
  • Each planetary gear 3 has an eccentric axis 5 , in addition to the centre of rotation constrained by the carriage 4 , driving a freely rotated or partially rotationally constrained platen 6 .
  • each of the platens 8 or 9 can be attached to a respective eccentric axis 5 , instead of the circular platen 6 shown in FIG. 1 .
  • a rectangular platen 10 can be attached to each of the respective eccentric axis 5 in an embodiment that employs four planetary gears 3 .
  • the carriage 4 When free to rotate, the carriage 4 will be driven by a net torque between the sanding surfaces and the workpiece (not shown) causing the sanding centres to describe a distorted epicycloid where the number of rotations of the respective planetary gear is not purely a function of the sun/planetary gear ratio. This is a random motion most suited to finishing applications.
  • the platens 6 will orbit a fixed centre, with no bulk rotation of the combined system. This constitutes a mode of operation suitable for sanding an inside corner that would be inaccessible by an equivalent single sanding platen of an area equal to the sum of the platen areas.
  • FIG. 3 shows an optional additional gear 7 including inwardly facing teeth (not shown) which engage with each of the planetary gears.
  • the gear 7 is concentric with the principal drive axis 1 .
  • this additional gear 7 is free to rotate, the above modes are accessible.
  • the platen centres will be driven in a strictly epicyclic motion. This results in higher surface to surface speeds and a corresponding increase in the rate of material removal.
  • FIG. 5 shows a simplified plan view of a preferred embodiment showing the particular phase relationship between the rotation of the eccentric axis on each of the planetary gears.
  • variable component of the resulting moments from each of the platens will cancel each other out, ensuring that there is no torsional vibration transmitted to the user. This is true for any number of gears greater than or equal to three.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
US10/550,918 2003-03-28 2003-03-28 Rotary work tool with orbiting planetary gears containing eccentric axes for the attachment of polishing or sanding platens Abandoned US20060194528A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/GB2003/001376 WO2004085114A1 (fr) 2003-03-28 2003-03-28 Outil rotatif possedant des engrenages planetaires en orbite contenant des axes excentriques servant a fixer des plaques de polissage ou de sablage

Publications (1)

Publication Number Publication Date
US20060194528A1 true US20060194528A1 (en) 2006-08-31

Family

ID=33042166

Family Applications (1)

Application Number Title Priority Date Filing Date
US10/550,918 Abandoned US20060194528A1 (en) 2003-03-28 2003-03-28 Rotary work tool with orbiting planetary gears containing eccentric axes for the attachment of polishing or sanding platens

Country Status (4)

Country Link
US (1) US20060194528A1 (fr)
EP (1) EP1620229A1 (fr)
AU (1) AU2003219306A1 (fr)
WO (1) WO2004085114A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007004995A1 (de) * 2007-02-01 2008-08-07 Metabowerke Gmbh Motorisch angetriebenes Exzenterschleifgerät
US20130109277A1 (en) * 2011-11-02 2013-05-02 The Boeing Company Robotic end effector including multiple abrasion tools
CN111571354A (zh) * 2020-04-24 2020-08-25 杨皓然 一种压力调节阀的阀体加工工艺
US20220055176A1 (en) * 2018-12-27 2022-02-24 Robert Bosch Gmbh Hand-Held Power Tool
CN117644471A (zh) * 2024-01-29 2024-03-05 北京特思迪半导体设备有限公司 偏心驱动机构的偏心距精确调节方法

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITVI20040090A1 (it) * 2004-04-16 2004-07-16 Positec Group Ltd Dispositivo antivibrante per macchina levigatrice motorizzata, e macchina levigatrice incorporante tale dispositivo
US7104873B1 (en) 2005-04-18 2006-09-12 Positec Power Tools (Suzhou) Co. Anti-vibration arrangement
WO2007000074A1 (fr) * 2005-06-27 2007-01-04 Positec Power Tools (Suzhou) Co., Ltd. Dispositif anti-vibration pour machine abrasive, machine comportant ledit dispositif et procédé de nettoyage de surface de pièce de fabrication
CN100436063C (zh) * 2006-04-12 2008-11-26 厦门大学 行星机构金刚石磨具
CN100441376C (zh) * 2006-05-10 2008-12-10 厦门大学 气动端面行星运动式金刚石磨具
US9239002B2 (en) 2010-08-03 2016-01-19 Heinz-Gustav Reisser Orbiting planetary gearing system and internal combustion engine employing the same
SE535278C2 (sv) * 2010-12-10 2012-06-12 Jan Urban Thysell Anordning för slipning varvid anordningen är mobil och bland annat innefattar en fritt roterande planetskiva och via elmotorer roterbart förbundna sliprondeller
WO2014052455A2 (fr) * 2012-09-25 2014-04-03 Heinz-Gustav Reisser Système à engrenage planétaire en orbite et moteur à combustion interne l'employant
ITRE20130022A1 (it) * 2013-03-26 2014-09-27 Lorenzo Segapeli Apparato per migliorare la lavorazione di sgrossatura; levigatura; lucidatura; lappatura spazzolatura delle superfici di materiali lapidei; prodotti ceramici; gres; gressmaltato compositi vari
ES2575277B1 (es) * 2014-11-26 2017-02-23 Estudios De Ingenieria Adaptada, S.L. Porta-herramienta de doble eje motorizado
CN107336105B (zh) * 2017-07-19 2019-04-05 天津大学 一种结构紧凑的行星抛光装置
CN110052957B (zh) * 2019-04-24 2021-05-21 嘉兴市志华机械有限公司 一种双行星轮系磨头

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1430214A (en) * 1922-09-26 Grinding and polishing machine
US2759305A (en) * 1954-06-11 1956-08-21 Cyclo Mfg Company Portable abrading and polishing machine
US4097950A (en) * 1977-03-07 1978-07-04 Milliken Research Corporation Device for scrubbing surfaces

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH237159A (de) * 1943-08-19 1945-04-15 Buehler Ag Geb Fussbodenreinigungsgerät.
CH268486A (de) * 1948-09-25 1950-05-31 Mueller Bruetsch & Co Maschine zum Reinigen von Fussböden.
DE1158674B (de) * 1959-07-29 1963-12-05 Mauz & Pfeiffer Mehrscheibenbohnermaschine
GB0123657D0 (en) * 2001-10-02 2001-11-21 The Technology Partnership Plc Worktool

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1430214A (en) * 1922-09-26 Grinding and polishing machine
US2759305A (en) * 1954-06-11 1956-08-21 Cyclo Mfg Company Portable abrading and polishing machine
US4097950A (en) * 1977-03-07 1978-07-04 Milliken Research Corporation Device for scrubbing surfaces

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007004995A1 (de) * 2007-02-01 2008-08-07 Metabowerke Gmbh Motorisch angetriebenes Exzenterschleifgerät
US20130109277A1 (en) * 2011-11-02 2013-05-02 The Boeing Company Robotic end effector including multiple abrasion tools
US10035237B2 (en) * 2011-11-02 2018-07-31 The Boeing Company Robotic end effector including multiple abrasion tools
US20220055176A1 (en) * 2018-12-27 2022-02-24 Robert Bosch Gmbh Hand-Held Power Tool
US12122011B2 (en) * 2018-12-27 2024-10-22 Robert Bosch Gmbh Hand-held power tool
CN111571354A (zh) * 2020-04-24 2020-08-25 杨皓然 一种压力调节阀的阀体加工工艺
CN117644471A (zh) * 2024-01-29 2024-03-05 北京特思迪半导体设备有限公司 偏心驱动机构的偏心距精确调节方法

Also Published As

Publication number Publication date
WO2004085114A1 (fr) 2004-10-07
EP1620229A1 (fr) 2006-02-01
WO2004085114A8 (fr) 2005-12-01
AU2003219306A1 (en) 2004-10-18

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Legal Events

Date Code Title Description
AS Assignment

Owner name: TECHNOLOGY PARTNERSHIP PLC, UNITED KINGDOM

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:RAWILINS, PHILIP JOHN;CARR, MATTHEW JOHN;REEL/FRAME:018404/0249

Effective date: 20050914

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION