EP2039465B1 - Druckeinrichtung für Polierkissen einer Poliermaschine - Google Patents

Druckeinrichtung für Polierkissen einer Poliermaschine Download PDF

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Publication number
EP2039465B1
EP2039465B1 EP08165042A EP08165042A EP2039465B1 EP 2039465 B1 EP2039465 B1 EP 2039465B1 EP 08165042 A EP08165042 A EP 08165042A EP 08165042 A EP08165042 A EP 08165042A EP 2039465 B1 EP2039465 B1 EP 2039465B1
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EP
European Patent Office
Prior art keywords
pad
plunger piston
piston means
cylinder
stem
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EP08165042A
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English (en)
French (fr)
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EP2039465A1 (de
Inventor
Fabio Balducci
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VIET SpA
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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
    • 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
    • B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
    • B24B21/04—Machines or devices using grinding or polishing belts; Accessories therefor for grinding plane surfaces
    • B24B21/06—Machines or devices using grinding or polishing belts; Accessories therefor for grinding plane surfaces involving members with limited contact area pressing the belt against the work, e.g. shoes sweeping across the whole area to be ground
    • B24B21/08—Pressure shoes; Pressure members, e.g. backing belts

Definitions

  • the present invention concerns sandpapering and smoothing and refers to a pushing device for a pad provided for pushing an abrasive means, for example a tape or abrasive cloth sheet, and for pushing against a surface, for example of a wood panel, its by-products or other synthetic or natural materials, specially suitable for polishing machines, sanders and/or thickness-sanding machines.
  • abrasive means for example a tape or abrasive cloth sheet
  • a surface for example of a wood panel, its by-products or other synthetic or natural materials, specially suitable for polishing machines, sanders and/or thickness-sanding machines.
  • the known pushing devices for pressing abrasive belts of grinding machines are equipped with respective pneumatic cylinders for generating the movement forces of pad sectors and forces for matching the grinding against the surface.
  • Document US4527359 discloses diaphragm cylinders controlled by sensing and control means for imparting vertical motion to plunger means acting an segments of a Platen means for adjustably positioning an abrasive belt.
  • a disadvantage of the known devices is that these devices are not suitable for generating the very small and regular needed forces, for example, for water varnishes because of frictions, mainly the first detachment friction.
  • An object of this invention is to propose a pushing device for a pad of a polishing or sanding machine designed to work with very low grinding forces and with regular movements and without jamming in order to uniformly smoothing both flat panels and strongly irregular panels.
  • numeral 1 indicated the pushing device for a pad or for a pad sector 2 of a polishing or sanding machine, object of the present invention, for smoothing, for grinding or for sanding to thickness an element to be polished P, for example a panel, a leaf, a door, a furniture element, a wooden casing frame or the like, wood derivates, metallic alloy, plastic material or any natural or synthetic material.
  • the pad or, when the pad consists of a plurality of sectors, the pad sector 2 is provided for acting onto an abrasive means A, for example a movable abrasive tape, for pressing it against the element P to be polished, for example a constant thickness or variable panel, with a reduced value force and almost constant also in presence of thickness variations of the panel and other changing conditions.
  • an abrasive means A for example a movable abrasive tape
  • the element P to be polished is moved on a horizontal plane while the pushing force of the pad against the abrasive means A and the element P to be polished is vertically and downwardly directed.
  • the pad 2 is fixed, by means of threaded means 17, at an external end of a plunger piston means 3 sliding vertically in a cylinder 4 thereof with vertical axis.
  • the upper end of the cylinder 4 ends with the head which, on the upper part, delimits a pressure room 5 downwardly delimited by the plunger piston means 3.
  • Said pressure room 5 is fed by means of duct 12 of a gas under pressure, for example filtered and compressed air, for the downwardly pushing of the plunger piston means 3.
  • a gas under pressure for example filtered and compressed air
  • the plunger piston means 3 is of the type without gaskets in order to minimize the first detachment friction to make more constant the pushing force onto the pad also in presence of movements of the latter due to different levels of element to be smoothed.
  • the clearance, that is the diameter difference, between the plunger piston means 3 and the respective cylinder 4 is so to allow the passage of an slight or negligible air flow according to feeding amount. Said flow reduces the frictions further improving the pushing force constancy and precludes the entry of working residues and of other powders between the plunger piston means 3 and the respective cylinder 4 preventing the reciprocal locking.
  • the device 1 can include an annular seal means, of material and forms with low friction, applied to the plunger piston means 3 and sliding onto the surface of the cylinder 4 or vice-versa.
  • the annular seal means is applied at the free end of the cylinder so that the plunging piston 3 glides therein with very low friction and in order to prevent the powder and/or dirty entrance between cylinder and floating piston.
  • the device includes movable stroke stop means 6, fit for limiting the stroke of the plunger piston means 3 in the direction opposite to the pressure room 5 imposing a lower arrest condition.
  • the movable stroke stop means 6 are actuated by lifting means 23 for moving the arrest condition between an operating external condition, in which the stroke stop means 6 allow maximum stroke of the plunger piston means 3 downwardly, and an inner rest condition in which the stroke stop means 6 raise at the upper end the arrest condition locking the plunger piston means 3 against the cylinder 4 head, or near this latter.
  • the stroke stop means 6 include a cylindrical stem 7 an end thereof has an enlargement means 8, for example cylindrical shaped, sliding inside the longitudinal bore 9 of the plunger piston means 3 of tubular type.
  • the enlargement means 8 is provided for matching an inner abutment 10 of the longitudinal bore 9 in the stop and rest internal conditions.
  • the longitudinal bore 9 of the plunger piston means 3 upwardly flows, towards the pressure room 5, by means of opening 11 having diameter lower than that of the bore 9 and to that of the enlargement means and slightly higher than that of the stem 7 crossing it. In this way the inner mouth of the opening 11 is defined by the inner abutment 10.
  • the lifting means 23 include a floating piston means 13 fixed at the upper end of the stem 7 and sliding in a respective cylinder 14.
  • the floating piston 13 divides the cylinder 14 into two opposite chambers supplied by respective ducts 15, 16 feeding an operating pressurized fluid flowing into the ends of said cylinder 14.
  • the cylinder 14 of the floating piston means 13 is of the double-acting type with each end fed by a respective duct 15, 16 but, as an alternative, the invention provides that the single lower chamber is equipped with a respective duct 16.
  • the lifting means 23 would be able only to move upwardly the plunger piston means 3, that is in the rest condition, while the translation of the enlargement means 8 downwardly in the lower locking condition that is operative, is entrusted to the plunger piston means at the beginning of the operation. Also in this case the downwardly pushing force is produced by the plunger piston means 3.
  • the stem 7, the longitudinal bore 9, the floating piston means 13, the double acting cylinder 14 and the stem 7, are coaxial.
  • the plunger piston means 3 and the respective pad 2 have a stroke of about 10 mm and therefore the difference between the longitudinal extensions of the floating piston 13 and of the respective cylinder 14 is of about 10 mm.
  • the free stroke of the pad is sufficient, for example, lengthen the longitudinal extension of the cylinder of the floating piston.
  • the lifting means 23 are of the electromagnetic type and may include a linear actuator with output translating shaft or arm fixed to the stem 7 or in single body with this latter.
  • the pad 2 has a stop rotation pin 18 parallel to the plunger piston means 3 and slidingly engaged into a respective housing 19 obtained in a cylinder 4 support of the plunger piston means 3.
  • the end portion, flowing in the pressure room 5, of the duct 12 is coaxial to the stem 7.
  • Each device 1 can be separated from the others or associated to all or part of the other devices controlling all sectors forming the pad.
  • the device can comprise at least one supporting body that is common with a plurality of devices 1.
  • the body is monolithic and joins the devices 1 of all pad sectors forming the pad or sub-assemblies thereof. More bodies can be reciprocally joined, by means of support beams, for making a complete pad.
  • the number of pad sectors can be any, for example it is possible to have 60 devices with the same number of sectors of a pad for a nominal working width of 1350 mm or 48 sectors for the working width of 1100. Pads consisting of 42 sectors for the width 1350 are provided and of 35 sectors for the width 1100.
  • the pad with 60 sectors can have 5 bodies, everyone with 12 devices for the same number of sectors, the pad with 48 sectors can be of 4 bodies, everyone with 12 devices for the same number of sectors.
  • a pad with 48 or with 35 sectors can have 48 or 35 devices kept together by one or more beams.
  • the ducts 12, 15, 16 can be opened and closed by respective electro-valves controlled by a control means of each device 1, fixed to the same device 1, or by a remote and centralized single control means.
  • a possible operation of the device starting from the rest raised condition in which the single lower chamber of the cylinder 14 of the floating piston means 13 is under pressure, provides that the pressure of the upper chamber of the cylinder 14 of the floating piston means 13 is progressively increased by getting over the pressure of the lower chamber and translating downwardly the floating piston 13 and the enlargement means 8.
  • the raising of the pressure in the pressure room 5 of the cylinder 4 of the plunging piston 3 produces the pushing force transmitted by the same plunging piston 3 to the pad or its sector 2 and from this latter to the abrasive means and to the element to be worked. Near the terminal border of element to be worked, the pad is lifted by connecting the duct 15, of the upper chamber of the cylinder 14 of the floating piston means 13, with the pressure of the external environment.
  • the duct 12 feeding the pressure room 5 of the cylinder 4 of the plunging piston 3 is connected, by means of valve means 20, with two gas sources with different pressures P1. P2.
  • the valve means 20 commute the pushing pressure, transmitted by the pad or pad sector 2 to the abrasive means and to the element P to be polished, by means of a pneumatic ring seal 21.
  • An advantage of this invention is to supply a pushing device for a pad of a polishing machine fit for working with very low grinding forces and with regular movements and without jamming in order to uniformly smooth both flat panels and strongly irregular panels.
  • Additional advantage consists in that the device can be used in grinding machines for elements of any material.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Manufacturing Of Printed Wiring (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

Claims (14)

  1. Druckeinrichtung für ein Polierkissen, oder einen Polierkissenabschnitt (2) einer Poliermaschine, vorgesehen zum Drücken eines Schleifmittels (A) gegen ein zu polierendes Element (P), wobei die Einrichtung (1) ein Tauchkolbenmittel (3) umfasst, das in einen jeweiligen Zylinder (4) gleitet und das zusammen mit dem Kopf des Zylinders (4) einen Druckraum (5) begrenzt, der mittels eines Kanals (12) mit einem Druckgas versorgt wird, um das Tauchkolbenmittel (3) zu drücken, wobei das Polierkissen oder der Polierkissenabschnitt (2) an dem Tauchkolbenmittel (3) befestigt ist, wobei das Tauchkolbenmittel (3) von der Art ohne Dichtungen ist und der Zwischenraum zwischen dem Tauchkolbenmittel (3) und dem jeweiligen Zylinder (4) den Durchgang eines leichten oder unbedeutenden Luftstroms erlaubt.
  2. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, dass das freie Ende des Zylinders (4) mit einem reibungsarmen Dichtungsmittel versehen ist, das auf dem Tauchkolbenmittel (3) gleitet, um zu vermeiden, dass Staub hinein gelangt.
  3. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, dass sie ein Hubstoppmittel (6) umfasst, das geeignet ist, den Hub des Tauchkolbenmittels (3) in der Richtung gegenüberliegend dem Druckraum (5) bis zu einem Arretierzustand zu stoppen; wobei das Hubstoppmittel (6) beweglich ist und durch Hebemittel (23) zwischen einem äußeren Betriebszustand, in dem das Hubstoppmittel (6) den maximalen Hub des Tauchkolbenmittels (3) bis zum Arretierzustand zulässt, und einem inneren Ruhezustand, in dem das Hubstoppmittel (6) das Tauchkolbenmittel (3) an oder nahe dem Kopf des Zylinders (4) stoppt, betrieben wird.
  4. Einrichtung nach Anspruch 3, dadurch gekennzeichnet, dass das Hubstoppmittel (6) eine Schiebestange (7) umfasst, deren eines Ende ein Verlängerungsmittel (8) aufweist, das im Innern einer Längsbohrung (9) des Tauchkolbenmittels (3) gleitet und vorgesehen ist, zu einem inneren Anschlag (10) der Längsbohrung (9) mindestens in dem Arretier- und in dem inneren Ruhezustand zu passen, wobei die Schiebestange (7), die Längsbohrung (9) und das Tauchkolbenmittel (3) koaxial sind.
  5. Einrichtung nach Anspruch 4, dadurch gekennzeichnet, dass die Längsbohrung (9) des Tauchkolbenmittels (3) zum Druckraum (5) mittels einer Öffnung (11) verläuft, deren Durchmesser kleiner ist, als der der Bohrung (9) und der des Verlängerungsmittels (8) und leicht größer, als der der Schiebestange (7), die sie kreuzt, wobei die innere Mündung der Öffnung (11) durch den inneren Anschlag (10) bestimmt ist.
  6. Einrichtung nach Anspruch 4 oder 5, dadurch gekennzeichnet, dass das Hebemittel (23) ein schwimmendes Kolbenmittel (13) umfasst, das an der Schiebestange (7) befestigt ist und in einem jeweiligen Zylinder (14) gleitet, der von mindestens einem Kanal (15, 16) versorgt wird, der eine Betriebs-Druckflüssigkeit zuführt, die in mindestens ein Ende des Zylinders (14) strömt.
  7. Einrichtung nach Anspruch 6, dadurch gekennzeichnet, dass der Zylinder (14) des schwimmenden Kolbenmittels (13) ein doppeltwirkender Typ ist, bei dem jedes Ende von einem jeweiligen Kanal (15, 16) versorgt wird, wobei das schwimmende Kolbenmittel (13), der doppeltwirkende Zylinder (14) und die Schiebestange (7) koaxial sind.
  8. Einrichtung nach Anspruch 4, dadurch gekennzeichnet, dass das Hebemittel (23) ein lineares Betätigungselement umfasst, das eine/n sich translatorisch bewegende/n Ausgangsschiebestange oder einen Arm aufweist, die/der an der Schiebestange (7) befestigt ist oder Bestandteil von ihr ist, wobei das lineare Betätigungselement des Hebemittels (23) elektromagnetischer Art oder ähnlich ist.
  9. Einrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Polierkissen oder der Polierkissenabschnitt (2) an dem Ende des Tauchkolbenmittels (3) gegenüberliegend dem Druckraum (5) mittels Gewindemitteln (17) befestigt ist.
  10. Einrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Polierkissen oder der Polierkissenabschnitt (2) einen Drehstoppstift (18) aufweist, der parallel zum Tauchkolbenmittel (3) und auf gleitende Weise in einem jeweiligen Gehäuse (19) in Eingriff ist, das in einem Gestell für den Zylinder (4) des Tauchkolbenmittels (3) ausgeführt ist.
  11. Einrichtung nach Anspruch 4, dadurch gekennzeichnet, dass der Endabschnitt des Kanals (12), der in den Druckraum (5) fließt, koaxial in Bezug zur Schiebestange (7) ist.
  12. Einrichtung nach Anspruch 4, dadurch gekennzeichnet, dass der Kanal (12) an zwei Gasquellen bei unterschiedlichen Drücken (P1, P2) mittels Ventilmitteln (20) angeschlossen ist, die geeignet sind, den Drückdruck des Polierkissens oder des Polierkissenabschnitts (2) gegen das Schleifmittel (A) und gegen das zu polierende Element (P) umzuschalten.
  13. Einrichtung nach Anspruch 12, dadurch gekennzeichnet, dass das Ventilmittel (20) eine pneumatische Ringdichtung (21) zum Schalten der Drückdrucke umfasst.
  14. Einrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass sie mindestens einen einzelnen Stützkörper für eine Mehrzahl Einrichtungen (1) umfasst, wobei der Körper monolithisch hergestellt ist und geeignet ist, alle Einrichtungen (1) aller Polierkissenabschnitte zu verbinden, die das Polierkissen oder eine Teilmenge davon bilden.
EP08165042A 2007-09-24 2008-09-24 Druckeinrichtung für Polierkissen einer Poliermaschine Active EP2039465B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000648A ITBO20070648A1 (it) 2007-09-24 2007-09-24 Dispositivo di spinta per un tampone di una levigatrice.

Publications (2)

Publication Number Publication Date
EP2039465A1 EP2039465A1 (de) 2009-03-25
EP2039465B1 true EP2039465B1 (de) 2010-11-24

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EP (1) EP2039465B1 (de)
AT (1) ATE489196T1 (de)
DE (1) DE602008003633D1 (de)
IT (1) ITBO20070648A1 (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103522176B (zh) * 2012-10-18 2017-04-26 江苏省（扬州）数控机床研究院 一种可控磨削力浮动光整加工磨头
EP3012067B1 (de) * 2014-10-22 2023-05-03 BIESSE S.p.A. Anlage zum schleifen/endbearbeiten von platten aus holz, metall oder dergleichen
IT201800007999A1 (it) * 2018-08-09 2020-02-09 Viet Italia Srl Macchina levigatrice per la levigatura/satinatura di pannelli di legno, metallo, o simili
CN109877678B (zh) * 2019-04-09 2021-04-20 广东利迅达机器人系统股份有限公司 一种用于智能锁面板的打磨设备
CN110695808A (zh) * 2019-11-15 2020-01-17 中国工程物理研究院激光聚变研究中心 一种单轴抛光机构
EP3838481B1 (de) * 2019-12-16 2024-01-24 BIESSE S.p.A. Schleifmaschine zum schleifen/endbearbeiten von platten aus holz, metall oder dergleichen

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3374583A (en) * 1965-09-20 1968-03-26 Walter Jacobi & Sons Inc Apparatus for finishing surfaces
GB1151775A (en) * 1966-08-05 1969-05-14 Rubery Owen & Company Ltd Resistance Welding Equipment.
DE2320345A1 (de) * 1973-04-21 1974-11-07 Karl Heesemann Bandschleifmaschine
US4527359A (en) * 1984-04-23 1985-07-09 Timesavers, Inc. Segmented platen with diaphragm cylinder control

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Publication number Publication date
DE602008003633D1 (de) 2011-01-05
ITBO20070648A1 (it) 2009-03-25
EP2039465A1 (de) 2009-03-25
ATE489196T1 (de) 2010-12-15

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