EP0657248A1 - Läppkopf für Stein, insbesondere für Granitplatten - Google Patents

Läppkopf für Stein, insbesondere für Granitplatten Download PDF

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Publication number
EP0657248A1
EP0657248A1 EP94119192A EP94119192A EP0657248A1 EP 0657248 A1 EP0657248 A1 EP 0657248A1 EP 94119192 A EP94119192 A EP 94119192A EP 94119192 A EP94119192 A EP 94119192A EP 0657248 A1 EP0657248 A1 EP 0657248A1
Authority
EP
European Patent Office
Prior art keywords
lapping
wheels
head according
kinematic elements
lapping head
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
EP94119192A
Other languages
English (en)
French (fr)
Other versions
EP0657248B1 (de
Inventor
Walter Cado
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.)
BREMA S.P.A.
Original Assignee
BREMA Srl
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 BREMA Srl filed Critical BREMA Srl
Publication of EP0657248A1 publication Critical patent/EP0657248A1/de
Application granted granted Critical
Publication of EP0657248B1 publication Critical patent/EP0657248B1/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
    • 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

Definitions

  • the invention concerns the realization of an improved lapping head for slabs of rocky material.
  • Said lapping heads consist of a body having a cylindrical or polyhedral shape which supports on the outer surface a plurality of lapping wheels.
  • the head is caused to rotate around its vertical axis so as to set into rotation the lapping wheels arranged around its periphery which, simultaneously, are also caused to oscillate each around a horizontal axis.
  • the lapping of the plate is therefore obtained by the abrasive action of the lapping wheels which combine the rotating motion around a vertical axis with the oscillating motion of each one on a vertical flat surface.
  • the rotational movement of the head and the oscillation of the lapping wheels are obtained through a kinematism consisting of a pinion which simultaneously engages with two toothed wheels co-axial with one another, one of which is attached to the body of the head while the other one is attached to a cam.
  • the cam rotates with a slightly different speed in relation to the body of the lapping head and then the oscillating motions per minute performed by the lapping wheels around their own axis are considerably lower in relation to the number of revolutions per minute performed by the body of the head.
  • Another inconvenience consists in that the cam realizes with the oscillating levers of the shafts supporting the lapping wheels an almost point-shaped contact, and, at any rate a contact which is restricted to a segment of a very reduced length.
  • Another inconvenience consists in that the presence of the control oscillating levers of the shafts supporting the lapping wheels which develop their dimensions following a tangential direction, restrict the number of lapping wheels which can be assembled on each lapping head depending on the respective diameter.
  • the lapping heads belonging to the known technique require an accurate adjustment during the assembly, above all with regard to the positioning of the oscillating mechanisms of the lapping wheels in relation to the profile of the cam.
  • a lapping head with oscillating lapping wheels, object of the Italian registered No. 85504/A/90 in the name of the same inventor has been realized which, as compared with the lapping heads belonging the known technique, is of simpler construction, its inner elements are less subject to wearing, it absorbs without damage shocks and accidental dynamic stresses, it does not require difficult matchings or adjustments when assembled, it works more reliably and needs less maintenance.
  • Another inconvenience consists also in that the structure of the lapping head is such that, even reducing as much as possible the dimensions of the kinematisms and of the mechanical mechanisms which compose it, it is unavoidable for the lapping wheels to be separated from each other by a certain distance.
  • the purpose of the invention is to eliminate these inconveniences too.
  • the main purpose of the invention is to obtain an improved lapping head in which the lapping wheels which it supports present points of contact with the working surface which are constantly variable and such that each lapping wheel operates on surfaces differing from the surfaces treated by the preceding lapping wheel.
  • a lapping head which, in accordance with the main claim comprises a casing supporting a plurality of lapping wheels closed by means of a lid and supported by a central shaft connected with a driving element, said casing containing first kinematic elements co-operating with one another and co-operating through second kinematic elements with an internal gear innerly attached to said lid, and it is characterized in that each of said lapping wheels is attached to the end of a pivot which presents the opposite end connected inside a hole drilled in one of said first kinematic elements and is provided, in an essentially central position, with a spheric body united to the casing through connecting mechanisms suited to allow, during the rotating motion of said lapping head, a conic motion of revolution of the longitudinal axis of said pivot supporting the lapping wheels in relation to the longitudinal axis of the corresponding element of said first kinematic elements, and with a centre of revolution coinciding with the geometric centre of said spheric body, as well as a simultaneous
  • the head according to the invention presents said first kinematic elements consisting of bevel pinions coupled within lodgings obtained in the body of said casing, and engaging with a sun wheel externally co-axial with the central shaft.
  • said lapping head presents said first kinematic elements consisting of a guiding disk inside which a pilot disk is coupled, the latter, in turn, being eccentrically attached outside the central shaft.
  • said lapping head is equipped with four peripheral lapping wheels, essentially positioned in correspondence with the vertexes of a square and with their longitudinal axis arranged in a slanted position in relation to the longitudinal axis of the shaft located at the center of the lapping head itself.
  • each of said lapping wheels rotates with a conic motion of revolution around the longitudinal axis of the bevel pinion to which the shaft which supports said lapping wheel is connected, said shaft having a centre of revolution which coincides with the centre of a spheric body belonging to said pivot which supports said lapping wheel.
  • the contact of the lapping wheel is constantly variable in width and describes in correspondence with the working surface itself, circular crowns which are constantly variable in width.
  • the improved lapping head according to the invention allows a higher finishing quality of the surfaces being treated, while also allowing a constant and more uniform wear of the lapping wheels in correspondence with the area which is in contact with the surface being treated.
  • this fact advantageously allows a better distribution of the loads with a consequent decreased stress of the mechanical mechanisms which compose the lapping head, and a better distributed stress on the plates or the paving tiles being treated.
  • the lapping head according to the invention comprises a casing 22 on top of which a lid 21 provided with an axial hole 23, is attached though proper connecting means, such as screws 25, for instance.
  • a flange 3 presenting an eccentric axial hole 31 is assembled, said flange not being able to rotate because is attached by means of a pivot 4 to a fork 5, secured to the machine bed 24 of the lapping machine to which the lapping head belongs.
  • an internal gear 7 which, therefore, is also attached to the casing 22.
  • the toothed central wheel 6 which constitutes second kinematic elements and engages with the internal gear 7, while inside the eccentric hole 31 of the same flange 3 is coupled, by means of bearings 32, a central shaft 2.
  • Said central shaft 2 is attached to the casing 22 through mechanical connecting means, for instance through a nut 33 which couples with its threaded extremity 34.
  • the central wheel 6 is entirely contained in the inner diameter of the gear 7 and therefore presents a lower number of teeth than the gear.
  • said first kinematic element consists of a sun wheel 10 which is slidingly keyed on the intermediate diameter 35 of the central shaft 2 by means of the interposition of a bearing 36.
  • said pivot 9, said seat 42 and said slot 8 constitute the connecting means which make said central wheel 6 and said sun wheel 10 mechanically and stably connected with one another.
  • the pivot 9 allows the central wheel 6 to set into rotation also the sun wheel 10 which performs a rotating motion around the longitudinal axis 100 of the shaft 2 which coincides with the axis of rotation of the entire head 1.
  • the sun wheel 10 engages with other four first kinematic elements consisting of bevel pinions 13 which are arranged in an orthogonal position in relation to each other, each of them, as can be observed in Fig. 1, is coupled in a housing 15 obtained in the casing 22, eventually by means of the interposition of a bearing 14.
  • Each bevel pinion 13 is provided with a hole 16 which, as can be observed in Fig. 3, is eccentrically drilled with eccentricity 17 in relation to the axis 18 of the bevel pinion 13 itself.
  • said pivot 122 presents a spheric body 125 which is lodged in a seat 126, assembled in a housing 226 obtained in the casing 22 and within which it is bound by a pin 128 the extremity of which co-operates in a housing 142 obtained in the spheric body 125 itself.
  • said pin 128 presents one extremity 228 coupled with a corresponding seat 328 obtained in the casing 22 within which it can rotate on itself following the arrow 528, and the opposite extremity has a prismatic profile 428, bound in a corresponding prismatic housing 142 obtained in the spheric body 125.
  • the coupling between the prismatic profiles 428 of the pin 128 and 142 of the spheric body 125 allows the latter to perform any movement around its geometric centre 127 except the rotating motion around the longitudinal axis 129 of the shaft 122 supporting the lapping wheels, and passing through said geometric centre 127.
  • the geometric centre 127 of the spheric body 125 coincides with the point defined by the intersection between the longitudinal axis 18 of each bevel pinion 13 and the longitudinal axis 129 of the shaft 122 supporting the lapping wheels, which is arranged in a slanted position and which passes through the centre 40, visible in Fig. 3, of the eccentric hole 16 drilled in each of said bevel pinions 13.
  • the lapping wheel 124 presents, as can be observed in Fig. 1, its axis of rotation which coincides with the axis 129 of the pivot 122 supporting the lapping wheels, which is slanted by the angle 41 in relation to the longitudinal axis 18 of each bevel pinion 13.
  • the central shaft 2 Whenever the central shaft 2 is set into rotation, it also causes to rotate, following the same direction, the casing 22 and, by means of the internal gear 7 attached to the lid 21, it causes the rotation of the kinematic elements consisting of the central wheel 6, of the sun wheel 10 and of the bevel pinions 13 engaging with said sun wheel 10.
  • Each bevel pinion 13 by rotating around its vertical axis 18, forces the extremity 121 of the shaft 122 supporting the lapping wheels, to perform a motion of revolution around the axis 18 of the bevel pinion 13 itself, so that the longitudinal axis 129 of the shaft 122 supporting the lapping wheels, rotates with a conic motion of revolution around the longitudinal axis 18, with a revolution centre 127.
  • the contact line 60 of the lapping wheel 124 with the surface to be lapped 51 visible in Fig. 1, is then constantly variable, as can be observed in the Figs. from 4 to 11.
  • each bevel pinion 13 and the lapping wheel joined to it rotate following the opposite direction indicated by the arrow 71, so that the contact line 60 of the horizontal lapping wheels 124 with the working surface 51 describe the crown 61, while the contact lines 160 of the vertical lapping wheels 224 describe the crown 161, wherein each of said crowns corresponds to a lapping area on the working surface 51.
  • each bevel pinion 13 positions itself as represented in Fig. 4, the contact line of each lapping wheel with the working surface 51 is moved by a certain angular quantity because of the rotation following direction 71 of each lapping wheel simultaneously with the rotation following direction 70 of the head to which said lapping wheel belongs.
  • the contact lines 60 and 160 of the lapping wheels 124 and 224 respectively position themselves as represented in the situation of Fig. 5, wherein the working area of the contact lines 60 corresponds with the crown 62, while the working area of the contact lines 160 corresponds with the crown 162.
  • the lapping head moves on the working surface 51 following any horizontal direction represented by the arrows 73 and, consequently, the working areas which are crown-shaped, intersect with one another so that the contact line of one lapping wheel does not interfere with the working area of the preceding lapping wheel or, however, such an intersection is extremely limited.
  • the contact lines 60 and 160 operate, therefore, on the circular crowns 66 and 166 represented in Fig. 9 and then reach the situation represented in Fig. 10 which is completely similar to the working situation represented in Fig. 6 wherein, in this case too, both the contact lines 60 and 160 work on the circular crowns 67 and 167 respectively, which are coincident with one another.
  • Fig. 12 A different embodiment based on the same idea of solution is represented in Fig. 12 wherein it can be observed that in the lapping head according to the invention, indicated as a whole with 601, said first kinematic elements, which in the solution previously described consist of a sun toothed wheel 10 and of the bevel pinions 13, in this case consist of a pilot disk 510, externally coupled with eccentricity 511 to the central shaft 502 and of a guiding disk 513 which internally receives the coupling of the pilot disk 510.
  • said first kinematic elements which in the solution previously described consist of a sun toothed wheel 10 and of the bevel pinions 13, in this case consist of a pilot disk 510, externally coupled with eccentricity 511 to the central shaft 502 and of a guiding disk 513 which internally receives the coupling of the pilot disk 510.
  • holes 516 are drilled. These correspond in number to the lapping wheels 624 to be set into rotation and inside each of them a joint 620 is coupled.
  • each of said joints 620 the extremity 621 of a shaft 622 is coupled, said shaft, as for the embodiment solution previously described, presents in an intermediate position a spheric body 625 and on the opposite extremity 523 supports a cup-shaped lapping wheel 624.
  • the rotating motion of the pilot disk 510 causes, therefore, the guiding disk 513 to perform a motion of revolution since said guiding disk 513 is bound to the body 522 of the head of the cylindrical bush 630 which engages in the hole 631 drilled in body 522 itself.
  • This motion of revolution around the vertical axis 632 of the head generates a conic rotating motion of the shaft 622 and of the corresponding lapping wheel 624.
  • the lapping head object of the invention achieves the proposed purposes.
  • the first purpose which has been achieved is the realization of a head in which the point of contact of the lapping wheels with the surface being treated is constantly variable, so that each lapping wheel operates on a surface which is independent in relation to the surface on which the preceding lapping wheel has operated.
  • the conic motion of the lapping wheel entails a constant variation of the point of contact also for the lapping wheel itself which permits a constant renewal of the lines of contact themselves.
  • the head according to the invention realized according to the described variation, permits also to reduce the manufacturing costs.
  • the lapping head according to the invention may undergo some modifications entailing a different embodiment with regard to the number of lapping wheels which may vary indefinitely and in any case may differ from four.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
EP94119192A 1993-12-07 1994-12-06 Läppkopf für Stein, insbesondere für Granitplatten Expired - Lifetime EP0657248B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITVI930195 1993-12-07
ITVI930195A IT1270758B (it) 1993-12-07 1993-12-07 Testa levigatrice perfezionata per materiale lapidei, particolarmente per granito in lastre

Publications (2)

Publication Number Publication Date
EP0657248A1 true EP0657248A1 (de) 1995-06-14
EP0657248B1 EP0657248B1 (de) 1997-08-06

Family

ID=11425374

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94119192A Expired - Lifetime EP0657248B1 (de) 1993-12-07 1994-12-06 Läppkopf für Stein, insbesondere für Granitplatten

Country Status (3)

Country Link
EP (1) EP0657248B1 (de)
DE (1) DE69404814D1 (de)
IT (1) IT1270758B (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0920957A1 (de) * 1997-12-04 1999-06-09 Synergy Sarda s.n.c. Lapp- und Polierkopf für Steinplatte
EP1046463A2 (de) * 1999-04-20 2000-10-25 CO.ME.S. S.r.l. Planierschleifkopf für Gesteinmaterialen
WO2009090551A1 (en) * 2008-01-18 2009-07-23 Co.Me.S S.R.L. 'head for the treatment of stone and ceramic material
ITFI20080126A1 (it) * 2008-07-11 2010-01-12 Comes Srl Testa per il trattamento di materiali lapidei o ceramici
WO2010106389A1 (en) * 2009-03-18 2010-09-23 Co.Me.S. S.R.L. Head for the treatment of stone and ceramic materials
CN102950542A (zh) * 2011-08-22 2013-03-06 广东科达机电股份有限公司 螺旋排布式抛光磨头

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE680641C (de) * 1936-04-10 1939-09-02 Marbriere De Paris Sa Soc Flaechenschleif- und Poliervorrichtung fuer harte Werkstoffe verschiedener Haerte, insbesondere fuer Gestein
EP0437831A1 (de) * 1990-01-18 1991-07-24 Brema Srl Polierkopf mit schwingenden Schleifsteinen zum Bearbeiten von Steinmaterialien, insbesondere von Granitplatten

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE680641C (de) * 1936-04-10 1939-09-02 Marbriere De Paris Sa Soc Flaechenschleif- und Poliervorrichtung fuer harte Werkstoffe verschiedener Haerte, insbesondere fuer Gestein
EP0437831A1 (de) * 1990-01-18 1991-07-24 Brema Srl Polierkopf mit schwingenden Schleifsteinen zum Bearbeiten von Steinmaterialien, insbesondere von Granitplatten

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0920957A1 (de) * 1997-12-04 1999-06-09 Synergy Sarda s.n.c. Lapp- und Polierkopf für Steinplatte
EP1046463A2 (de) * 1999-04-20 2000-10-25 CO.ME.S. S.r.l. Planierschleifkopf für Gesteinmaterialen
EP1046463A3 (de) * 1999-04-20 2002-04-10 CO.ME.S. S.r.l. Planierschleifkopf für Gesteinmaterialen
WO2009090551A1 (en) * 2008-01-18 2009-07-23 Co.Me.S S.R.L. 'head for the treatment of stone and ceramic material
ITFI20080126A1 (it) * 2008-07-11 2010-01-12 Comes Srl Testa per il trattamento di materiali lapidei o ceramici
WO2010004374A1 (en) * 2008-07-11 2010-01-14 Co.Me.S S.R.L. Head for the treatment of stone and cerahic materials
WO2010106389A1 (en) * 2009-03-18 2010-09-23 Co.Me.S. S.R.L. Head for the treatment of stone and ceramic materials
CN102950542A (zh) * 2011-08-22 2013-03-06 广东科达机电股份有限公司 螺旋排布式抛光磨头

Also Published As

Publication number Publication date
ITVI930195A1 (it) 1995-06-07
DE69404814D1 (de) 1997-09-11
IT1270758B (it) 1997-05-07
EP0657248B1 (de) 1997-08-06
ITVI930195A0 (it) 1993-12-07

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