EP1790433B1 - Smoothing machine for wooden articles - Google Patents

Smoothing machine for wooden articles Download PDF

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Publication number
EP1790433B1
EP1790433B1 EP20060110627 EP06110627A EP1790433B1 EP 1790433 B1 EP1790433 B1 EP 1790433B1 EP 20060110627 EP20060110627 EP 20060110627 EP 06110627 A EP06110627 A EP 06110627A EP 1790433 B1 EP1790433 B1 EP 1790433B1
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EP
European Patent Office
Prior art keywords
smoothing
gauging
article
machine
treated
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.)
Active
Application number
EP20060110627
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German (de)
English (en)
French (fr)
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EP1790433A1 (en
Inventor
Marino Angeloni
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Individual
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Individual
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    • 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
    • B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
    • B24B7/20—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor characterised by a special design with respect to properties of the material of non-metallic articles to be ground
    • B24B7/28—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor characterised by a special design with respect to properties of the material of non-metallic articles to be ground for grinding wood
    • 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
    • B24B47/00—Drives or gearings; Equipment therefor
    • B24B47/10—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces
    • B24B47/12—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces by mechanical gearing or electric power

Definitions

  • the present invention relates to a machine as for example known from document WO-A1-2005/056234 for smoothing-gauging flat surfaces of rough wooden articles, or wooden articles to the surface of which one or more layers of various coatings have been previously applied (for example transparent varnish or paint).
  • Articles of this type include for example wooden doors or wooden door panels for furniture, including in the form of a frame, which present flat surfaces, a face of an article also being able to present several flat surfaces lying in the same plane or in parallel planes, such surfaces being separated or bounded by recessed and/or relief profiles.
  • These machines comprise: a horizontal conveyor device (in particular a conveyor belt) for moving the articles to be smoothed-gauged, and a smoothing-gauging device or several smoothing-gauging devices disposed in succession above the conveyor device, each smoothing-gauging device being movable vertically in the two directions relative to the conveyor device.
  • Each smoothing-gauging device comprises an externally abrasive flexible annular band mounted about at least three parallel horizontal rollers, of which at least one is motorized to slide the abrasive band along them.
  • rollers are disposed perpendicular to the advancement direction of the conveyor device, and between two of these rollers (those of lower elevation) a means is provided which, from the interior of and through the abrasive band, exerts on the article transiting along the conveyor device local thrusts in restricted consecutive regions aligned parallel to the rollers, in order to obtain the same abrasive effect in all those article surface regions to be treated, independently of any planarity defects which the surface to be treated may present.
  • Said pressing means consists essentially of a large number of electronically operated aligned vertical pistons (for example 48 or 60 in number) which thrust the relative abrasive band portion against the article surface.
  • An object of the present invention is therefore to provide a smoothing-gauging machine which does not present these drawbacks, is decidedly simpler and less costly than the aforedescribed known machines, and enables all the flat surfaces present on a face of a wooden article to be treated, even if these surfaces lie in offset parallel planes and are separated or bordered by relief profiles.
  • the smoothing-gauging machine is provided with means for moving each smoothing-gauging unit parallel to the surface to be treated while maintaining the article fixed; or with means for maintaining the smoothing-gauging unit fixed while moving the article parallel to its surface to be treated.
  • each rotary smoothing-gauging element has a circular shape when viewed in plan, and in particular can be in the form of a disc, the abrasive surface of which, also preferably circular, being that facing the article to be treated.
  • the smoothing-gauging element or the abrasive surface cannot have other than circular shapes, for example hexagonal or square, or even star shaped with a determined number of points, these points being rounded (as apparent hereinafter).
  • the smoothing-gauging element is motorized by keying the element (for example in the form of a disc) onto the end of a motorized shaft perpendicular to its abrasive surface, the shaft extending from the face opposite that on which the abrasive surface is provided.
  • the connection between the drive shaft and rotary smoothing-gauging element need not be rigid, hence allowing slight rocking, which in some cases can lead to better results.
  • the abrasive surface of the rotary smoothing-gauging element can be conveniently obtained by using an abrasive paper, of the type already used in the form of an abrasive band in known smoothing-gauging machines. If the rotary smoothing-gauging element is in the form of a disc, the shape of the sheet of abrasive paper will also be circular and of the same diameter as the disc. Instead of abrasive paper a layer or blanket of a suitable abrasive material can be used, for the material known by the brand name SCOTCH BRITE.
  • a rotary smoothing-gauging element comprises a rigid part provided with a flat face facing the surface to be treated, to this flat face there being fixed a layer of elastic material the outer face of which is made abrasive, for example by applying abrasive paper or a layer of said abrasive material thereto.
  • the operation of applying the abrasive paper or layer of abrasive material, or their removal when they are to be replaced, is much facilitated if using for their application so-called hook and eye means such as those known by the brand name VELCRO.
  • the smoothing-gauging machine shown therein and indicated by 12 also comprises a conventional conveyor belt which is not shown in the figures, but which extends horizontally with its advancement direction perpendicular to the plane of the drawing, and serves mainly to bring into position an article, indicated by 10 (for example a wooden door panel of the type without relief profiles, shown schematically in the figure), the upper flat surface 10S of which is to be smoothed.
  • a conventional conveyor belt which is not shown in the figures, but which extends horizontally with its advancement direction perpendicular to the plane of the drawing, and serves mainly to bring into position an article, indicated by 10 (for example a wooden door panel of the type without relief profiles, shown schematically in the figure), the upper flat surface 10S of which is to be smoothed.
  • Figure 1 does not shown the bed of the machine 12.
  • the present invention enables a smoothing-gauging machine to be provided able to treat a flat surface of a wooden article which is of any shape and of any ratio between its three dimensions.
  • the smoothing-gauging machine 12 comprises a frame indicated overall by 14, carried by a bed not shown.
  • the frame 14 comprises two lateral columns 16 along which two parallel horizontal connecting cross-members 18 rigidly move vertically, one for each side of the plane in which the two columns 16 lie.
  • the two cross-members 18 also act as runways for a carriage 22 carrying a smoothing-gauging unit indicated overall by 29 and comprising, in the specific example, a pair of smoothing-gauging devices indicated by 29.1 and 29.2 and provided with relative rotary smoothing-gauging elements 28.1 and 28.2, of disc form in the specific example.
  • a smoothing-gauging machine of the invention comprising a smoothing-gauging unit having a single smoothing-gauging device or more than two smoothing-gauging devices; and can also present more than one smoothing-gauging unit.
  • the diameter of at least one of the rotary smoothing-gauging elements 28.1 and 28.2 is conveniently selected such that its radius is the same as the curvature radius of the rounded edge.
  • a smoothing-gauging element 28.1, 28.2 with the smallest diameter usable, whilst hand refining the non-treated parts of the edge surface at a later stage.
  • the machine according to the invention offers an advantage in that by the soothing-gauging machines known in the art it was not possible to treat articles with relief profiles.
  • the rotary smoothing-gauging elements 28.1 and 28.2 are keyed onto the lower end of a relative vertical shaft 30.1, 30.2 driven by a corresponding gearmotor 32.1 and 32.2 respectively, the latter also supported by the carriage 22.
  • Vertical movement of the pair of cross-members 18 and hence of the carriage 22, and consequently of the smoothing-gauging unit 29, is achieved by a conventional mechanism comprising a gearmotor 34 driving a horizontal shaft 36 which operates two vertical screws (not shown in the figs for simplicity), one at each of the two columns 16 and cooperating with respective lead nuts (also not shown) each fixed to a corresponding connection element 20 of the relative end of the pair of cross-members 18.
  • connection element 20 on the right of Figure 1 also carries a second gearmotor 38 operating a conventional male-female screw combination (not shown) enabling the carriage 22 to be moved transversely in the two directions along the pair of cross-members 18.
  • the disc-shaped smoothing-gauging elements 28.1 and 28.2 comprise in this specific example (best seen by observing the discoidal smoothing-gauging element 28 shown enlarged in Figure 4 ) a rigid support disc 40 (for example of steel) and a disc-shaped layer of elastic material 42 (for example a spongy rubber), applied (for example glued) thereto on the lower face of the rigid disc 40.
  • a rigid support disc 40 for example of steel
  • a disc-shaped layer of elastic material 42 for example a spongy rubber
  • the discoidal smoothing-gauging element 28 of Figure 4 is according to the invention fixed coaxially to the lower end of the operating shaft 30 by self-centering quick connection means, comprising in the specific example three male elements 44 fixed to the shaft 30, parallel thereto, by a round plate 47.
  • the male elements 44 are positioned at the vertices of an equilateral triangle centered about the shaft 30.
  • Each male element 44 engages a corresponding female element 46 fixed in corresponding positions on the upper face of the rigid disc 40.
  • the female elements 46 are provided with a flared mouth for self-centering and with means for snap-retention (not visible, but of conventional type) of the relative male element 44 when this latter is forced into the female element 46. For its release, a force in the opposite direction has to be applied.
  • These quick connection means are evidently similar to those used in compressed air hoses.
  • a joint for example a universal joint
  • said joint is provided just above the round plate 47.
  • the rotary smoothing-gauging elements can have a plan shape other than circular (for example in the form of a regular polygon), although for certain embodiments it could be convenient to use particular shapes.
  • two rotary smoothing-gauging elements 28A.1 and 28A.2, shown flat in Figure 5 are star shaped with rounded points. This specific shape enables just one of the two to be rotated using a single gearmotor, the rotation of the other element, which is idle, being a consequence of the rotation of the first.
  • the smoothing-gauging machine 12 is conveniently provided with a control unit of the conventional type, preferably of microprocessor type, for controlling and programming machine operation on the basis of the articles to be treated, so as to optimise its use.
  • the machine 12 also comprises (as already stated) a horizontal conveyor belt extending in a direction perpendicular to the plane of the sheet containing Figure 1 , and enabling the article 10 to be located in the position for treating its upper surface 10S.
  • the smoothing-gauging unit 29 is located at a height (greater than that shown in Figures 1 and 3 ) such as not to constitute an obstacle to the positioning of the article 10 by driving the conveyor belt.
  • the carriage 22 can be positioned such that the smoothing-gauging unit 29 is firstly positioned vertically above the machining commencement position, after which it is lowered to bring the abrasive surface of the rotary smoothing-gauging elements 28.1 and 28.2 in contact with that surface 10S of the article 10 to be treated.
  • the gearmotors 32.1 and 32.2 are operated so that the rotary smoothing-gauging elements 28.2 and 28.2 enter into action.
  • the entire upper surface 10S of the article 10 can be swept, or just a part thereof, this being useful if a face of the article presents several surfaces disposed in parallel planes or separated and/or bordered by relief profiles.
  • smoothing-gauging results can be obtained (after some experience) which are not only comparable to those of the best known smoothing-gauging machines, but are decidedly better and at low cost.
  • the smoothing-gauging machine can be conveniently provided with sensors connected to control unit to sense the entry and exit of an article, and if required even its geometrical characteristics, this enabling the smoothing-gauging operation on an article to be automated to the maximum extent by suitably programming the control unit.
  • the carriage 22 carrying the smoothing-gauging unit 29 can move only transversely (along the pair of cross-members 18), so that movement of the article 10 in a direction perpendicular to the preceding is achieved by the conveyor belt (not shown), a smoothing-gauging machine could evidently be provided in which the article, once brought to the machine, is maintained fixed and conventional means are provided to also move the carriage horizontally in the direction perpendicular to that of the cross-members 18.
  • the smoothing-gauging machine of the invention can also be provided with additional sanding devices in the form of a rotary cylindrical brush rotatable about its axis, of the type described in Italian patent 1284081 and used in the sanding machine described in EP-A-1332833 .
  • these brush sanding means present filiform flexible elements extending substantially radially from a coaxial shaft and are grouped in angularly equidistant rows normally parallel to the shaft axis, there being interposed between the rows of filiform elements flexible abrasive sheets the far edge of which projects beyond the free end of the filiform elements, whereas the near edge of these sheets is fixed to the shaft, each abrasive sheet being cut into outwardly extending strips.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
EP20060110627 2005-11-28 2006-03-03 Smoothing machine for wooden articles Active EP1790433B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITMI20052271 ITMI20052271A1 (it) 2005-11-28 2005-11-28 Macchina levigatrice per manufatti in legno

Publications (2)

Publication Number Publication Date
EP1790433A1 EP1790433A1 (en) 2007-05-30
EP1790433B1 true EP1790433B1 (en) 2012-06-06

Family

ID=36035662

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20060110627 Active EP1790433B1 (en) 2005-11-28 2006-03-03 Smoothing machine for wooden articles

Country Status (3)

Country Link
EP (1) EP1790433B1 (da)
DK (1) DK1790433T3 (da)
IT (1) ITMI20052271A1 (da)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2123396A1 (en) 2008-05-22 2009-11-25 Marino Angeloni Smoothing/brushing machine for wooden articles and relative operating method
CN112571182A (zh) * 2020-12-04 2021-03-30 湖南省玛芸家居科技有限公司 一种家具生产加工用的打磨封边装置
CN114055271B (zh) * 2021-11-12 2024-01-30 唐山市汉沽管理区珍荣家具制造有限公司 一种环保家具板材打磨装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6200206B1 (en) * 1998-10-05 2001-03-13 Edward Drees Surface preparation device
WO2002044590A1 (fr) * 2000-11-30 2002-06-06 Kazushi Yanagimoto Procede de fabrication d'un engrenage asymetrique, engrenage asymetrique, engrenage non circulaire et asymetrique, mecanisme d'engrenage et machine de finition au tonneau
DE20108243U1 (de) * 2001-05-16 2001-07-26 Ingenieur-Büro Gottschild GmbH, 33790 Halle Vorrichtung zum Versäubern von plattenförmigen, beschichteten Werkstücken
DE20315778U1 (de) * 2003-10-14 2003-12-11 Böllhoff GmbH Entkoppelnde Verbindungsanordnung mit Federklammer

Also Published As

Publication number Publication date
ITMI20052271A1 (it) 2007-05-29
DK1790433T3 (da) 2012-09-10
EP1790433A1 (en) 2007-05-30

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