EP0460133B1 - Exzenterschleifmaschine - Google Patents

Exzenterschleifmaschine Download PDF

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Publication number
EP0460133B1
EP0460133B1 EP90917589A EP90917589A EP0460133B1 EP 0460133 B1 EP0460133 B1 EP 0460133B1 EP 90917589 A EP90917589 A EP 90917589A EP 90917589 A EP90917589 A EP 90917589A EP 0460133 B1 EP0460133 B1 EP 0460133B1
Authority
EP
European Patent Office
Prior art keywords
grinding
grinding disc
eccentric
rim
markings
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.)
Expired - Lifetime
Application number
EP90917589A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0460133A1 (de
Inventor
Günther Berger
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0460133A1 publication Critical patent/EP0460133A1/de
Application granted granted Critical
Publication of EP0460133B1 publication Critical patent/EP0460133B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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

Definitions

  • the invention is based on an eccentric grinding machine according to the preamble of claim 1.
  • DE-OS 36 09 441 US Pat. No. 4,759,152
  • a machine with a grinding plate which carries two different-sized toothed rings on its back, which cause a different amount of abrasion on the machined workpiece when the rotational movement is at different speeds.
  • the running machine however, it is difficult to tell whether the random orbital sander produces a coarse or a fine cut.
  • the eccentric grinding machine according to the invention with the characterizing features of claim 1 has the advantage that the grinding pattern is displayed even when the grinding disc is rotating.
  • Figure 1 shows a partial cross section through an eccentric grinding machine
  • Figure 2 shows a view of a grinding plate
  • Figure 3 shows a micrograph.
  • An eccentric grinding machine as described for example in DE-OS 36 09 441, shows a housing 3, a central eccentric gear 4 and a rolling gear 5 which is partially connected to the housing 3.
  • the eccentric gear 4 comprises a connector 6 which is connected to the shaft of a drive motor, not shown.
  • an eccentric sleeve 7 is connected eccentrically, within which a roller-supported support pin 8 is rotatably mounted.
  • a grinding plate 10 is firmly connected by a screw 9.
  • the sanding plate 10 is provided on the side facing away from the eccentric gear 4 with an abrasive surface, in particular an abrasive paper 11.
  • the sanding paper 11 can be glued on or connected to the sanding plate 10 by a Velcro fastener.
  • the grinding plate 10 On the side facing the eccentric gear 4, the grinding plate 10 carries two toothed rings 12 and 13 of different diameters, the teeth of which face each other.
  • a toothed ring 14 engages in one of the ring gears 12, 13.
  • the toothed ring 14 has an external toothing 15 and an internal toothing 16 which in the axial direction in two different Levels.
  • the internal toothing 16 of the toothed ring 14 engages in the ring gear 12 of the grinding plate 10.
  • the external toothing 15 of the interchangeable ring 14 meshes with an internally toothed housing ring gear 17 which is firmly connected to the housing 3.
  • the toothed ring 14 can be turned so that its outer toothing 15 meshes with the ring gear 13 of the grinding plate 10 and the inner toothing 16 of the toothed ring 14 meshes with an externally toothed housing ring gear 18 fastened to the housing 3.
  • the toothed ring 14 is part of the rolling gear 5, which causes the grinding plate 10 to roll as a result of the deflection of the grinding plate 10 caused by the eccentric gear 4 in a forced rotational movement relative to the housing 3.
  • the rolling movement takes place either in the same direction as the eccentric movement, the ring gear 13 of the grinding plate rolling on the toothed ring 14, or the rotational movement takes place counter to the eccentric movement.
  • the ring gear 12 rolls on the toothed ring 14.
  • the mode of operation shown in FIG. 1 results in a fine, less abrasive cut, the other mode of operation results in a coarse cut with a large amount of removal.
  • Points on the grinding plate describe epicycloids during fine grinding and hypocycloids during coarse grinding.
  • Ordinary cycloids are formed directly on the pitch circle of the sprockets 12 and 13, while they are stretched or twisted radially outwards and radially inwards.
  • the gear rings 12 and 13 directly opposite are markings 20 on the sandpaper 11 on circular arcs, each with the radius of the partial circles, which indicate the type of grinding movement.
  • the words "GROB” and "FEIN” are printed on the sandpaper as markings; however, other characters or pictograms can also be applied.
  • FIG. 3 shows a grinding image generated by the grinding plate 10 in the rough grinding operating mode.
  • the developing hypocycloids 21 with a number n of fifteen reversal points or nodes 22 are clear.
  • the nodes n are each at a distance of an angle of rotation ⁇ of 24 ° to one another.
  • the markings 20 are in each case placed at a distance from one another on the radius of the ordinary hypocycloid.
  • n of nodes 22 there are cycloids standing on the grinding plate 10.
  • the markings 20 then appear as fixed symbols or lettering.
  • An integer number n of nodes 22 results if the quotient from the degree number of the full circle by the degree number of the angle of rotation ⁇ is an integer. If this quotient is half-integer, for example 15.5, then more are formed in the micrograph, in the example thirty-one standing nodes.
  • the micrograph of FIG. 3 can be produced if the toothed ring 13 of the grinding plate 10 has sixty teeth and the external teeth 15 of the toothed ring 14 have fifty-six teeth.
  • the markings 20 can be applied to the back of the sanding plate 10 on circular arcs with the radii of the partial circles of the toothed rings 12 and 13 instead of on the sanding paper 12.
  • a window 24 can be arranged on the housing 3 of the eccentric grinding machine 2, through which the mark 20 for rough grinding can be seen in FIG. 1.
  • the function of the eccentric grinding machine is described in detail in DE-OS 36 09 441.
  • the optical display of the micrograph according to the invention is based on the effect that the grinding plate 10 stands still for a short time during its rolling movement, forming the knots 22, so that the markings 20 applied become visible at this moment. If a marker 20 is applied to each node 22, a physical marker 20 is circulated at the virtual location of the next during the rolling movement. This is done with each of the markings 22, so that the repeated visualization of this large number of markings 20 at the same virtual location on the grinding wheel intensifies the optically visible display.
  • the invention is not limited to the exemplary embodiment.
  • a separate sanding plate is required for each sanding movement.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
EP90917589A 1989-12-21 1990-12-04 Exzenterschleifmaschine Expired - Lifetime EP0460133B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3942301 1989-12-12
DE3942301A DE3942301C1 (ru) 1989-12-21 1989-12-21

Publications (2)

Publication Number Publication Date
EP0460133A1 EP0460133A1 (de) 1991-12-11
EP0460133B1 true EP0460133B1 (de) 1993-10-27

Family

ID=6396024

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90917589A Expired - Lifetime EP0460133B1 (de) 1989-12-21 1990-12-04 Exzenterschleifmaschine

Country Status (5)

Country Link
US (1) US5167095A (ru)
EP (1) EP0460133B1 (ru)
BR (1) BR9007142A (ru)
DE (2) DE3942301C1 (ru)
WO (1) WO1991009705A1 (ru)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993020976A1 (en) * 1992-04-13 1993-10-28 Minnesota Mining And Manufacturing Company Abrasive article
JP3063872B2 (ja) * 1992-06-08 2000-07-12 株式会社マキタ 研磨機
US5331028A (en) * 1993-06-30 1994-07-19 Chevron Research And Technology Company, A Division Of Chevron U.S.A. Inc. Polymer-modified asphalt composition and process for the preparation thereof
GB9322174D0 (en) * 1993-10-28 1993-12-15 Minnesota Mining & Mfg Abrasive article
CA2220776A1 (en) * 1996-11-13 1998-05-13 Allen Sommers Eccentric grinder loading system
US5947804A (en) 1998-04-27 1999-09-07 Ryobi North America, Inc. Adjustable eccentricity orbital tool
US6062960A (en) * 1998-04-27 2000-05-16 Ryobi North America, Inc. Orbital tool
WO2007117129A1 (en) * 2006-03-03 2007-10-18 Ferronato Sandro Giovanni Gius System for indicating the grade of an abrasive
DE102007007787A1 (de) * 2007-02-16 2008-08-21 Robert Bosch Gmbh Schleifteller für eine Exzenterschleifmaschine
US9217492B2 (en) 2013-11-22 2015-12-22 Techtronic Power Tools Technology Limited Multi-speed cycloidal transmission
JP6249828B2 (ja) * 2014-03-07 2017-12-20 日東工器株式会社 研磨機

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3550324A (en) * 1968-04-17 1970-12-29 Red Arrow Enterprises Inc Surface treating apparatus
DE3602571C2 (de) * 1986-01-29 1998-09-24 Bosch Gmbh Robert Exzentertellerschleifer mit einer Vorrichtung zum Verändern der Schleifbewegung
DE3609441A1 (de) * 1986-03-20 1987-09-24 Bosch Gmbh Robert Exzenterschleifer mit einer vorrichtung zum veraendern der schleifbewegung
DE3615799C2 (de) * 1986-05-10 1994-10-13 Bosch Gmbh Robert Exzenterschleifer mit einer Vorrichtung zum Verändern der Schleifbewegung
DE3727487A1 (de) * 1987-08-18 1989-03-02 Miksa Marton Handschleifmaschine

Also Published As

Publication number Publication date
BR9007142A (pt) 1991-12-17
DE3942301C1 (ru) 1991-02-14
DE59003258D1 (de) 1993-12-02
EP0460133A1 (de) 1991-12-11
US5167095A (en) 1992-12-01
WO1991009705A1 (de) 1991-07-11

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