EP3711902B1 - Tampon et machine de sablage comprenant ledit tampon de sablage - Google Patents

Tampon et machine de sablage comprenant ledit tampon de sablage 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
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.)
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Application number
EP20160839.5A
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German (de)
English (en)
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EP3711902A1 (fr
Inventor
Marco Venturini
Roberto CAPITANI
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SCM Group SpA
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SCM Group SpA
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Publication of EP3711902A1 publication Critical patent/EP3711902A1/fr
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Classifications

    • 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.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)

Claims (13)

  1. Patin de ponçage (P) pour une unité de ponçage (G), pour poncer du bois, du plastique, du métal et des surfaces similaires, comprenant un corps rotatif (1) comportant un arbre entraîné rotatif (11) et une plaque principale (12) couplée audit arbre (11), ladite plaque principale (12) ayant une première (121) et une seconde (122) faces et une surface latérale (123), un disque abrasif (2) disposé sur ladite première face (121) dudit plateau principal (12), de manière à réaliser une opération de ponçage lorsque ledit arbre (11) est entraîné en rotation, et un élément annulaire (3) de blocage périmétrique dudit disque abrasif (2), dans lequel ledit élément annulaire (3) est couplé à ladite plaque principale (12) de manière à être mobile entre une position de déverrouillage dudit disque abrasif (2) et une position de blocage dudit disque abrasif (2), caractérisé en ce qu'il comprend des moyens élastiques (7) de couplage entre ledit élément annulaire (3) et ledit plateau principal (12) pour maintenir ledit élément annulaire (3) dans ladite position de blocage dudit disque abrasif (2).
  2. Patin de ponçage (P) selon la revendication précédente, caractérisé en ce qu'il comprend une contre-plaque (5), disposée en regard de ladite seconde face (122) de ladite plaque principale (12), dans laquelle ledit élément annulaire (3) est couplé au moyen de dispositifs de liaison et de fixation (51) à ladite contre-plaque (5), et en ce que lesdits moyens élastiques (7) sont interposés entre ladite plaque principale (12) et ladite contre-plaque (5).
  3. Patin de ponçage (P) selon l'une quelconque des revendications 1 ou 2, caractérisé en ce que lesdits moyens élastiques (7) sont comprimés lorsque ledit élément annulaire (3) est dans ladite position de déverrouillage et sont étendus lorsque ledit élément annulaire (3) est dans ladite position de blocage.
  4. Patin de ponçage (P) selon l'une quelconque des revendications 1 à 3, caractérisé en ce que lesdits moyens élastiques comprennent au moins un ressort (7).
  5. Patin de ponçage (P) selon la revendication 4, lorsqu'elle dépend de la revendication 2, caractérisé en ce que ladite contre-plaque (5) comprend un premier logement (51) pour ledit au moins un ressort (7), et en ce que ladite plaque principale (12) comprend un deuxième logement (125) pour ledit au moins un ressort (7) en correspondance avec ladite deuxième face (122).
  6. Patin de ponçage (P) selon la revendication 5, caractérisé en ce que ledit au moins un ressort (7) est disposé coaxialement par rapport à l'axe de rotation (R) dudit arbre (11).
  7. Patin de ponçage (P) selon la revendication 4 caractérisé en ce que lesdits moyens élastiques comprennent une pluralité de ressorts disposés alternativement:
    - coaxiaux les uns aux autres de manière coaxiale par rapport à l'axe de rotation (R) dudit arbre (11); ou
    - circonférentiellement sur ladite seconde face (122) de ladite plaque principale (12).
  8. Patin de ponçage (P) selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comprend un système de maintien (32, 17) pour maintenir ledit élément annulaire (3) dans ladite position de déverrouillage dudit disque abrasif (2), et vice versa.
  9. Patin de ponçage (P) selon la revendication 8, caractérisé en ce que ledit élément annulaire (3) présente une surface interne (31), tournée vers ladite plaque principale (12), en ce que ledit système de retenue (32, 17) comprend des moyens de guidage (32) disposés sur ladite surface interne (31), et au moins un relief (17), tel qu'une colonne vertébrale ou similaire, disposé sur ladite surface latérale (123) de ladite plaque principale (12), en prise avec lesdits moyens de guidage (32), dans lequel lesdits moyens de guidage (32) ont une première position dudit relief (17), correspondant à la position de déverrouillage dudit disque abrasif (2), et une deuxième position dudit relief (17) correspondant à la position de blocage dudit abrasif, disque (2).
  10. Patin de ponçage (P) selon la revendication précédente, caractérisé en ce que lesdits moyens de guidage (32) comprennent un trou oblong obtenu sur ladite surface interne (31) dudit élément annulaire (3), présentant une première (321) et une deuxième partie (322), positionnée à deux hauteurs différentes, correspondant respectivement à ladite première position dudit relief (17) et à ladite deuxième position dudit relief (17).
  11. Patin de ponçage (P) selon l'une quelconque des revendications précédentes, caractérisé en ce que l'élément annulaire (3) comprend au moins une première partie dentée (33) pour bloquer ledit disque abrasif (2), et/ou en ce que ladite plaque principale (12) comprend au moins une seconde partie dentée (124), disposée de préférence en face de ladite première partie dentée (33).
  12. Patin de ponçage (P) selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comprend une couche de matériau élastique (18) intercalée entre ladite première face (121) dudit plateau principal et ledit disque abrasif (2).
  13. Ponceuse (M) comprenant au moins une unité de ponçage (G), qui comprend à son tour au moins un patin de ponçage (P) selon l'une quelconque des revendications précédentes, animés chacun en rotation autour d'un axe respectif (R), ledit au moins un patin de ponçage (P) étant destiné au ponçage de surfaces en bois, plastique, métal et similaires.
EP20160839.5A 2019-03-19 2020-03-04 Tampon et machine de sablage comprenant ledit tampon de sablage Active EP3711902B1 (fr)

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.

Publications (2)

Publication Number Publication Date
EP3711902A1 EP3711902A1 (fr) 2020-09-23
EP3711902B1 true EP3711902B1 (fr) 2023-10-11

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Application Number Title Priority Date Filing Date
EP20160839.5A Active EP3711902B1 (fr) 2019-03-19 2020-03-04 Tampon et machine de sablage comprenant ledit tampon de sablage

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EP (1) EP3711902B1 (fr)
IT (1) IT201900003945A1 (fr)

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 (fr) 2020-09-23
IT201900003945A1 (it) 2020-09-19

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