EP3711902B1 - Schleifkissen und schleifmaschine mit besagtem schleifkissen - Google Patents

Schleifkissen und schleifmaschine mit besagtem schleifkissen Download PDF

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Publication number
EP3711902B1
EP3711902B1 EP20160839.5A EP20160839A EP3711902B1 EP 3711902 B1 EP3711902 B1 EP 3711902B1 EP 20160839 A EP20160839 A EP 20160839A EP 3711902 B1 EP3711902 B1 EP 3711902B1
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EP
European Patent Office
Prior art keywords
sanding
main plate
abrasive disc
annular element
sanding pad
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EP20160839.5A
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English (en)
French (fr)
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EP3711902A1 (de
Inventor
Marco Venturini
Roberto CAPITANI
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SCM Group SpA
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SCM Group SpA
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D9/00—Wheels or drums supporting in exchangeable arrangement a layer of flexible abrasive material, e.g. sandpaper
    • B24D9/08—Circular back-plates for carrying flexible material
    • B24D9/085—Devices for mounting sheets on a backing plate

Definitions

  • the present invention relates to a sanding pad and sanding machine comprising said sanding pad.
  • the invention relates to a sanding pad, and in particular to a sanding disc, used on a sanding machine, comprising a rotating body, consisting of a cylindrical element and at the base a plate element, an abrasive disc, a layer of elastic material, interposed between the abrasive disc and the plate element and a locking system of the abrasive disc.
  • the abrasive disc is fixed to the plate element by means of tear-off systems, generally consisting of two Velcro pieces, one placed on the abrasive and the other on the plate element.
  • tear-off systems generally consisting of two Velcro pieces, one placed on the abrasive and the other on the plate element.
  • document DE202017103070U1 describes a sanding pad for sanding machines, in which the abrasive is blocked to the plate element by means of a removable fixing ring, from which the abrasive disc protrudes.
  • the plate element has some holes, thanks to which the ring is fixed by magnets.
  • a further technical problem of the aforementioned device is that of having poor sealing uniformity of the abrasive disc.
  • the magnets exert a punctual clamping force on the abrasive disc, the seal is not uniform in all points of the ring.
  • Another object of the invention is to guarantee a perfect sealing of the abrasive disc during processing.
  • sanding pad for a sanding unit for sanding wood, plastic, metal and similar surfaces, comprising a rotating body having a rotating driven shaft and a main plate coupled with said shaft, said main plate having a first and a second face and a lateral surface, an abrasive disc arranged on said first face of said main plate, so as to carry out a sanding operation when said shaft is operated in rotation, and an annular element for the perimeter blocking of said abrasive disc, characterized in that said annular element is coupled with said main plate so as to be movable between an unlocking position of said abrasive disc and a blocking position of said abrasive disc.
  • said sanding pad includes elastic means for coupling between said annular element and said main plate to hold said annular element in said blocking position of said abrasive disc.
  • said sanding pad may comprise a counterplate, arranged facing said second face of said main plate, wherein said annular element is coupled by means of connecting and fixing devices to said counter-plate, and wherein said elastic means are interposed between said main plate and said counterplate.
  • said elastic means may be compressed when said annular element is in said unlocking position and are extended when said annular element is in said blocking position.
  • said elastic means may include at least one spring.
  • said counterplate may comprise a first housing for said at least one spring
  • said main plate may comprise a second housing for said at least one spring in correspondence of said second face.
  • said at least one spring may be coaxially arranged with respect to the rotation axis of said shaft.
  • said elastic means may comprise a plurality of springs alternately arranged:
  • said sanding pad may comprise a holding system for holding said annular element in said unlocking position of said abrasive disc, and vice-versa.
  • said annular element may have an internal surface, facing said main plate, said restraint system comprises guiding means arranged on said inner surface, and at least one relief, such as a spine or the like, arranged on said lateral surface of said main plate, engaged with said guiding means, wherein the said guiding means have a first position of said relief, corresponding to the unlocking position of said abrasive disc, and a second position of said relief corresponding to the blocking position of said abrasive disc.
  • said restraint system comprises guiding means arranged on said inner surface, and at least one relief, such as a spine or the like, arranged on said lateral surface of said main plate, engaged with said guiding means, wherein the said guiding means have a first position of said relief, corresponding to the unlocking position of said abrasive disc, and a second position of said relief corresponding to the blocking position of said abrasive disc.
  • said guiding means may comprise a slotted hole obtained on said internal surface of said annular element, having a first and a second portion, positioned at two different heights, corresponding respectively to said first position of said relief and to said second position of said relief.
  • said annular element may comprise at least one first toothed portion for blocking said abrasive disc, and/or said main plate may comprise at least one second toothed portion, preferably arranged facing said first toothed portion.
  • said sanding pad may comprise a elastic material layer interposed between said first face of said main plate and said abrasive disc.
  • a sanding machine comprising at least one sanding unit, which in its turn comprises at least one sanding pad according to any one of the preceding claims, each operated in rotation around a respective axis, said at least one sanding pad being intended for sanding surfaces made of wood, plastic, metal and the like.
  • a sanding pad P according to the present invention can be observed, which can be used in sanding machines.
  • Said sanding pad P is used in a sanding unit G, mounted on a sanding machine M, as shown in figures 5-6 .
  • said sanding unit G comprises four planetary heads 4, each one of which is driven in rotation about a respective axis.
  • Each of said four planetary heads 4 comprises in turn four pads P, rotated around four respective axes of rotation.
  • Each sanding pad P essentially comprises a rotating body 1, an abrasive disc 2, and an annular element 3.
  • Said rotating body 1 comprises a shaft 11, which can be rotated about a rotation axis R, and a main plate 12 coupled to said shaft 11, having a first 121 and a second 122 face and a lateral surface 123.
  • Said abrasive disc 2 is arranged in correspondence with said first face 121 of said main plate 12, for carrying out a sanding operation when said shaft 11 is driven in rotation.
  • Said abrasive disc 2 protrudes beyond said annular element 3 and is blocked on the circumference between said annular element 3 and said main plate 12, in particular between a first toothed portion 33 of said annular element 3 and a second toothed portion 124, placed in the bottom end of said lateral surface 123, and intended for coupling with said first toothed portion 33.
  • Said annular element 3 is movable with respect to said main plate 12 between an unlocking position of said abrasive disc 2 and a locking position of said abrasive disc 2.
  • Said sanding pad P also comprises elastic means 7, for coupling between said annular element 3 and said main plate 12 to retain said annular element 3 in the locking position of said abrasive disc 2.
  • the sanding pad P also comprises a counterplate 5, arranged facing said second face 122 of said main plate 12 and coupled to said annular element 3 by means of connection and fixing elements 51, such as for example screws.
  • Said elastic means 7 are interposed between said main plate 12 and said counterplate 5.
  • Said elastic means 7 are compressed when said annular element 3 is in said unlocking position, and are stretched when said annular element 3 is in said locking position.
  • Said elastic means 7 further comprise, in a preferred embodiment, at least one spring arranged coaxially with respect to said rotation axis R of said shaft 11.
  • Said spring is arranged between a first housing 52, obtained in said counterplate 5, and a second housing 125, obtained in said main plate 12, placed in correspondence with said second face 122.
  • said elastic means 7 comprise a plurality of springs arranged alternately:
  • a holding system which includes guiding means 32 arranged on an internal surface 31 of said annular element 3, facing said main plate 12.
  • Said holding system further comprises a pin 17 engaged with said guiding means 32, which is arranged on said lateral surface 123 of said main plate 12.
  • Said guiding means 32 provide a first position of said pin 17 on the same, to hold said annular element 3 in said unlocking position of said abrasive disc 2, and a second position of said pin 17, to release said annular element 3 in the position wherein said abrasive disc 2 is clamped due to the action of said elastic means 7. More particularly, referring to figure 3 , said guiding means 32 are made as a slot obtained on said internal surface 31 of said annular element 3, having a first 321 and a second 322 portion, positioned at different heights, so as to hold said annular element 3 in a different position when the pin 17 is housed in one of said portions of said slot.
  • Said annular element 3 can have different guiding means 32 on its internal surface 31.
  • said sanding pad P comprises a layer of elastic material 18, interposed between said first face 121 of said main plate and said abrasive disc 2.
  • the planetary heads 4, part of the sanding unit G, installed on the sanding machine M, are rotated.
  • Four planetary pads P are installed on each planetary head 4 , which in turn are rotated.
  • each sanding pad P At the base of each sanding pad P is placed the abrasive disc 2, which, when in contact with the piece to be worked, achieves the desired finish, due to the optimal adhesion ensured by the elastic element 6.
  • the abrasive disc 2 Since the abrasive disc 2 is made of wearable material, it must be frequently replaced by the operator.
  • the replacement of the abrasive disc 2 is also necessary when obtaining a different degree of finish on the piece to be worked is desired.
  • the operator can remove the worn abrasive disc 2 and replace it with a new abrasive disc 2.
  • the operator can tighten said new abrasive disc 2 by exerting a slight compression on the annular element 3, combined with a clockwise rotation.
  • said relief 17, inside said guiding means 32 passes from said second unlocking position of the abrasive disc 2, to said second position, for locking the abrasive disc 2; while said spring 7 passes from compressed to elongated and the abrasive disc 2 remains so tight, between the first toothed portion 33 of said annular element 3 and the second toothed portion 124 of said main plate 12, thanks to the action of the spring 7
  • An advantage of the present invention is that of guaranteeing a quick and practical replacement of the abrasive disc 2.
  • the annular element 3, during the replacement operations of the abrasive disc 2 by the operator remains coupled with the sanding pad P and must not therefore, in an impractical way, be removed and stored.
  • a further advantage of the present invention is that of providing a perfect sealing uniformity and a perfect fixing of the abrasive disc 2 during the working, thanks, in the preferred embodiment, to the uniform clamping force guaranteed by the spring 7.

Claims (13)

  1. Schleifkissen (P) für ein Schleifgerät (G), zum Schleifen von Holz, Kunststoff, Metall und ähnlichen Oberflächen, umfassend einen rotierenden Körper (1) mit einer rotierenden angetriebenen Welle (11) und einer Hauptplatte (12), die mit der besagten Welle (11) verbunden ist, wobei die besagte Hauptplatte (12) eine erste (121) und eine zweite (122) Fläche und eine Seitenfläche (123) aufweist, eine Schleifscheibe (2), die auf der besagten ersten Fläche (121) der besagten Hauptplatte (12) angeordnet ist, um einen Schleifvorgang auszuführen, wenn die besagte Welle (11) in Drehung versetzt wird, und ein ringförmiges Element (3) zur Blockierung des Umfangs der Schleifscheibe (2), wobei das besagte ringförmige Element (3) mit der besagten Hauptplatte (12) so gekoppelt ist, dass es zwischen einer Entriegelungsposition der besagten Schleifscheibe (2) und einer Blockierposition der besagten Schleifscheibe (2) beweglich ist, dadurch gekennzeichnet, dass sie elastische Mittel (7) zur Verbindung zwischen dem besagten ringförmigen Element (3) und der besagten Hauptplatte (12) umfasst, um das besagte ringförmige Element (3) in der Blockierposition der Schleifscheibe (2) zu halten.
  2. Schleifkissen (P) nach dem vorhergehenden Anspruch, dadurch gekennzeichnet, dass es eine Gegenplatte (5) umfasst, die gegenüber der besagten zweiten Fläche (122) der besagten Hauptplatte (12) angeordnet ist, wobei das besagte ringförmige Element (3) mittels Verbindungs- und Befestigungsvorrichtungen (51) mit der besagten Gegenplatte (5) verbunden ist, und dadurch, dass die besagten elastischen Mittel (7) zwischen der besagten Hauptplatte (12) und der besagten Gegenplatte (5) eingefügt sind.
  3. Schleifkissen (P) nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass die besagten elastischen Mittel (7) zusammengedrückt werden, wenn sich das besagte ringförmige Element (3) in der besagten Entriegelungsposition befindet, und ausgedehnt werden, wenn sich das besagte ringförmige Element (3) in der besagten Blockierungsposition befindet.
  4. Schleifkissen (P) nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die besagten elastischen Mittel mindestens eine Feder (7) umfassen.
  5. Schleifkissen (P) nach Anspruch 4, soweit abhängig von Anspruch 2, dadurch gekennzeichnet, dass die besagte Gegenplatte (5) ein erstes Gehäuse (51) für die besagte mindestens eine Feder (7) aufweist, und dadurch, dass die besagte Hauptplatte (12) ein zweites Gehäuse (125) für die besagte mindestens eine Feder (7) in Verbindung mit der besagten zweiten Fläche (122) umfasst.
  6. Schleifkissen (P) nach Anspruch 5, dadurch gekennzeichnet, dass die besagte mindestens eine Feder (7) koaxial zur Drehachse (R) der besagten Welle (11) angeordnet ist.
  7. Schleifkissen (P) nach Anspruch 4, dadurch gekennzeichnet, dass die besagten elastischen Mittel eine Vielzahl von abwechselnd angeordneten Federn umfassen:
    - koaxial zueinander in Bezug auf die Drehachse (R) der besagten Welle (11); oder
    - in Umfangsrichtung auf der besagten zweiten Fläche (122) der besagten Hauptplatte (12).
  8. Schleifkissen (P) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass es ein Haltesystem (32, 17) zum Halten des besagten ringförmigen Elements (3) in der Entriegelungsposition der besagten Schleifscheibe (2) umfasst und umgekehrt.
  9. Schleifkissen (P) nach Anspruch 8, dadurch gekennzeichnet, dass das besagte ringförmige Element (3) eine Innenfläche (31) aufweist, die der besagten Hauptplatte (12) zugewandt ist, und dadurch, dass das besagte Rückhaltesystem (32, 17) Führungsmittel (32) umfasst, die auf der besagten Innenfläche (31) angeordnet sind, und mindestens ein Relief (17), wie z.B. einen Dorn oder dergleichen, umfasst, das auf der besagten Seitenfläche (123) der besagten Hauptplatte (12) angeordnet ist und mit den besagten Führungsmitteln (32) in Eingriff steht, wobei die besagten Führungsmittel (32) eine erste Position des besagten Reliefs (17) aufweisen, die der Entriegelungsposition der besagten Schleifscheibe (2) entspricht, und eine zweite Position des besagten Reliefs (17), die der Blockierposition der besagten Schleifscheibe (2) entspricht.
  10. Schleifkissen (P) nach dem vorhergehenden Anspruch, dadurch gekennzeichnet, dass die besagten Führungsmittel (32) ein Langloch umfassen, das auf der besagten Innenfläche (31) des besagten ringförmigen Elements (3) ausgebildet ist und einen ersten (321) und einen zweiten (322) Abschnitt aufweist, die auf zwei unterschiedlichen Höhen positioniert sind, die der besagten ersten Position des Reliefs (17) bzw. der besagten zweiten Position des Reliefs (17) entsprechen.
  11. Schleifkissen (P) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das besagte Ringelement (3) mindestens einen ersten gezahnten Abschnitt (33) zum Blockieren der besagten Schleifscheibe (2) aufweist, und/oder dadurch, dass die besagte Hauptplatte (12) mindestens einen zweiten gezahnten Abschnitt (124) aufweist, der vorzugsweise gegenüber dem besagten ersten gezahnten Abschnitt (33) angeordnet ist.
  12. Schleifkissen (P) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass es eine Schicht (18) aus elastischem Material umfasst, die zwischen der besagten ersten Fläche (121) der besagten Hauptplatte und der besagten Schleifscheibe (2) angeordnet ist.
  13. Schleifmaschine (M) mit mindestens einer Schleifeinheit (G), die ihrerseits mindestens ein Schleifkissen (P) nach einem der vorhergehenden Ansprüche aufweist, das jeweils in Drehung um eine jeweilige Achse (R) betrieben wird, wobei das besagte mindestens eine Schleifkissen (P) zum Schleifen von Oberflächen aus Holz, Kunststoff, Metall und dergleichen bestimmt ist.
EP20160839.5A 2019-03-19 2020-03-04 Schleifkissen und schleifmaschine mit besagtem schleifkissen Active EP3711902B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102019000003945A IT201900003945A1 (it) 2019-03-19 2019-03-19 Platorello e macchina levigatrice comprendente tale platorello.

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EP3711902A1 EP3711902A1 (de) 2020-09-23
EP3711902B1 true EP3711902B1 (de) 2023-10-11

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IT (1) IT201900003945A1 (de)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US619921A (en) * 1899-02-21 Tool for grinding or polishing heels
ITBO20050064A1 (it) * 2005-02-09 2006-08-10 Viet Spa Dispositivo di levigatura
US9561580B2 (en) * 2014-03-07 2017-02-07 Prime Supply Inc. Grinding-disc device for power tools
DE202017103070U1 (de) 2017-05-22 2017-06-21 Mb Maschinenbau Gmbh Schleifteller für eine Schleifmaschine

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EP3711902A1 (de) 2020-09-23

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