EP0038763B1 - Maschine zum Schleifen abgerundeter Ecken - Google Patents

Maschine zum Schleifen abgerundeter Ecken Download PDF

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Publication number
EP0038763B1
EP0038763B1 EP19810400632 EP81400632A EP0038763B1 EP 0038763 B1 EP0038763 B1 EP 0038763B1 EP 19810400632 EP19810400632 EP 19810400632 EP 81400632 A EP81400632 A EP 81400632A EP 0038763 B1 EP0038763 B1 EP 0038763B1
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EP
European Patent Office
Prior art keywords
shoe
machine
abrasive
belt
abrasion
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Expired
Application number
EP19810400632
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English (en)
French (fr)
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EP0038763A1 (de
Inventor
Joseph Bellanger
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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
    • B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
    • B24B21/16—Machines or devices using grinding or polishing belts; Accessories therefor for grinding other surfaces of particular shape

Definitions

  • the present invention relates to machines for sanding convex rounded angles, in particular in the field of furniture manufacturing.
  • the machines hitherto used are generally of two types: machines with continuous belts and machines with discs.
  • Pre-shaping pulleys also allow the strip to adhere to the pad.
  • These machines have the following drawbacks: the need to have a range of pads corresponding to the rounded edges to be sanded; use of the strip over only part of its width, resulting in faster localized fouling and wear thereof.
  • the abrasive strip is kept pressed over its entire width, on the profile of the heel to be sanded using a convex brush in width to maintain the convexity of the strip in contact with the heel, the contact pressures being ensured at using a spring acting on a rocking lever whose upper end carries the brush, the latter being mounted oscillating on said end by means of a hinge pin.
  • the sanding of the entire surface of the heel is obtained by the progression of the heel in the working area of the band due to the rotation of the turntable, the band being free to bend due to the very mounting of the brush, as well as by the possibility of changing the obliquity of the trajectory of the abrasive strip with respect to the profile to be sanded and by successive changes of orientation of the heels with respect to said trajectory.
  • the disc machines use as an abrasive disc or grinding wheel of form whose active face corresponds to the counter-profile of the rounding to be sanded. These discs may consist of a base disc on which are mounted a flexible profiled ring and an external flexible support, the abrasive element proper conforming to the shape of the profiled ring.
  • the machine according to the invention makes it possible, using a single tool, to sand convex quarter round convex rounds, whatever their radius, using a standardized abrasive strip throughout its width, without risk. fouling thereof, or burning of the sanded material, the sanding carried out by said machine being of the enveloping type assimilating to long sanding quality carried out manually, the attack of the abrasive strip being effected tangentially to the one of the plane surfaces previously sanded taken as the reference face and acting progressively on the continuation of the quarter-round profile as and when the workpiece to be sanded advances on the machine, to reach the end of sanding, tangentially to a second flat reference face previously sanded perpendicular to the first reference face, the part of the part to be sanded having to cover the entire length of the pad to obtain the complete sanding of the flare, the pon station bolt proper which can be integrated into the whole of a multiple
  • the machine, object of the invention is mainly characterized in that it comprises a pad of helical shape on the surface of which circulates a continuous abrasive belt which can be driven by a pulley-motor assembly, the active zone of the belt evolving in the dihedral formed by a horizontal work table and the vertical face of a longitudinal guide, which shoe is on the one hand adjustable in position whatever the radius of the rounding to be sanded, according to the two reference planes constituted by the table and the guide and on the other hand adjustable to adapt to the value of the rounding to be sanded.
  • the active face of the pad is a portion of helicoid limited in length to a quarter of the pitch so that the theoretical edges of the end of the pad are in orthogonal planes, the angle of torsion of the abrasive strip remaining compatible with its mechanical characteristics ; this active face of the pad can be covered with a kind of thin mattress made of graphite material improving the friction conditions of the back of the abrasive strip during its passage over the pad. These frictions can also be attenuated by the presence, at each end of the pad, of cylindrical rollers with balls avoiding overheating and wear of the strip in contact with the edges limiting the pad in its length.
  • the band attacks the piece of wood to be sanded not frontally but at a certain angle; for this purpose the machining of the pad is carried out in such a way that the axis of the strip and the axis of the pad form a certain angle.
  • the sanding device the main characterizing element of the machine, consists of a pad 1 whose active face of helical shape serves as a sliding path for a continuous abrasive belt 2 driven in translation along a substantially triangular path at the top of which is located the shoe, the other angles respectively comprising a deflection pulley 3 and a drive driving pulley 4 wedged on the shaft of an electric motor 5, the tension of the strands of the strip being ensured by the tilting mounting of said motor on the machine frame.
  • the active face of the skate is similar to a portion of helicoid, surface generated by the displacement of the diameter of a cylinder resting on the axis of the latter and on a propeller drawn on the periphery of the cylinder, the helical resembling a screw with a thread of axis coincident with that of said helical, of depth equal to the radius, of width equal to the diameter of the generator cylinder.
  • the length of this portion of helicoid is limited to the value of a quarter of a step so that the end edges are arranged perpendicular to one another; for an observer placed, as shown in FIG.
  • the pad 1 is connected to the frame of the machine by means making it possible to adjust the abrasive face of the strip at the entry and at the exit of the pad with respect to planes. of reference corresponding respectively to the horizontal plane of the table of the machine and to the vertical plane containing the longitudinal guide of the workpiece to be sanded and by means of means allowing to adjust the value of the rounding to adapt it to that of the workpiece.
  • the helical face of the latter is lined with a sort of mattress consisting of a strip 6 of flexible graphite material. This mattress constitutes an easily interchangeable wearing part.
  • the pad is machined in such a way that the generator of the helicoid is no longer strictly perpendicular to the longitudinal axis of the shoe but forms with it an angle equal to 90 ° -â, a being the angle formed by the axis of the strip and the axis of the shoe ( Figures 9 and 10).
  • the abrasive face of the belt is adjusted at the input roller 7 relative to the horizontal reference plane formed by the machine table by acting on a screw 9 for controlling the front part in vertical translation skate support; the adjustment of said abrasive face of the strip at the output roller 8 with respect to the vertical reference plane constituted by the longitudinal guide is effected by acting on a screw 10 for controlling the rear part of the support in horizontal translation skate.
  • the setting of the value of the radius of the rounding is obtained by a combined action on a control screw 11 in horizontal translation of the front part of the pad support at the input roller 7 and on a control screw 12 in vertical translation of the rear part of the pad support at the output roller 8.
  • a cut 13 made both in the table and in the longitudinal guide allows the passage of the abrasive strip 2 in the angle of the dihedral formed by these two parts of the machine.
  • the machine performs an enveloping type sanding similar to long quality sanding done manually, the attack of the workpiece by the abrasive strip taking place tangentially to one of the flat faces, that which is supported on the table of the machine for example, previously sanded, taken as a reference face, which abrasive strip acts progressively on the continuation of the quarter-round profile as the workpiece is advanced on the machine to end, for example, at the end of sanding, tangentially to a second reference face also previously sanded, perpendicular to the first reference face, that which is in abutment on the longitudinal guide for example.
  • FIG. 12 illustrates the case of the rounding of a quarter of a circle tangentially connecting two orthogonal faces
  • FIG. 13 shows a rounding of radius substantially equal to the thickness of the piece of wood tangent to one of the faces leading to the opposite face of the latter by a second rounding of very small radius
  • FIG. 14 illustrates the case where a rounding tangent to one of the faces of the part ends in secant on the contiguous face, finally according to FIG.
  • a rounding may not be sanded which does not end tangentially on the two adjoining flat faces.
  • the sanding of the semicircle is obtained by two successive passes with inversion of the piece to be sanded; the same is true in the case of FIG. 13.
  • the rounding whatever the case, always corresponds to a quarter of a circle.
  • Figure 17 shows the detail of the fastenings of the support plate 14 of the shoe 1, on which plate are also fixed the cylindrical rollers 7 and 8.
  • a handle 11a On the screw 11 used for adjustment according to the value of the rounding to be sanded is mounted a handle 11a forming a nut, the screwing of which on the screw pushes along a nut 15 by compressing an opposing spring 16 interposed between said nut and the plate 17 fixing the screw on the frame, which spring ensures the translation of the nut is reversed when the handle 11a is unscrewed.
  • This screw is crossed by the screw 9 for adjusting the roller 7 relative to the table, which screw is extended at the top by a smooth part 9a which is housed in an oblong groove 18 executed in the longitudinal axis of the support plate 14 ; a compression spring 19 is interposed between the underside of the nut and a control handle 9b secured to the screw 9, the purpose of this spring being to avoid loosening of the screw under the effect of possible vibrations of the machine, by the contact pressures thus exerted on the threads of the screw.
  • the vertical line of action of the screw 9 is located substantially perpendicular to the axis of the cylindrical roller 7.
  • a handle 10a On the screw 10 used for adjusting the roller relative to the longitudinal guide of the machine, is mounted a handle 10a, forming a nut whose screwing on the screw pushes f f a nut 20 by compressing an opposing spring 21 interposed between said nut and the plate 22 fixing the screw on the frame, said spring ensuring the reversal of translation nuts when you unscrew the handle 10a.
  • the nut 20 is crossed by the adjustment screw 12 according to the value of the rounding to be sanded: this screw is the extension of the axis of the roller 8, the smooth part 12a of which crosses the nut, the threaded part being limited to the lower part for receiving a handle 12b forming a nut, the screwing of which ensures the vertical translation of the nut by pushing it, following f "by compressing an opposing spring 23.
  • the sanding unit according to the invention can be integrated as a terminal station in the assembly of a multiple machine carrying out the various machining phases preliminary to the sanding operation for rounding.
  • a machine can also include in line two or more sanding units intervening successively on the lower and upper edges of the part to be treated, so as to carry out for a single passage of the part on the machine, all of the sanding of its rectilinear edges, which sanding units intervene on one and / or the other or the other edges of said part.
  • the quality of the sanding obtained using the device involves running the workpiece at constant speed, hence the need for it to be taken over by a driving device. Similarly, it is recommended to obtain this result, simultaneous routing and sanding operations.
  • the positioning of the pad is adjusted relative to the horizontal and vertical reference surfaces which constitute the work table and the longitudinal guide respectively.
  • the positioning of the pad can be determined using feeler devices by taking as reference two orthogonal faces of the piece to be sanded, the pad then being mounted on a floating head.
  • the machine equipped with the sanding device, object of the invention can be used for all rounding sanding operations carried out on parts of solid wood, chipboard, plastic or other materials, and more particularly in the field of furniture. , chaisery, woodwork or any other delicate work.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Claims (9)

1. Maschine zum Schleifen von abgerundeten Ecken mit Viertelkreis beliebigen Radius mittels eines Schleifbandes (2), welches kontinuierlich auf einem Teil seiner Bahn über einen Gleitschuh (1) läuft, dadurch gekennzeichnet, daß die aktive Fläche des Gleitschuhes (1) entsprechend dem Angriffsbereich des Schleifbandes (2) an dem zu schleifenden Stück ein schraubenförmiger Teil ist, dessen erforderliche Länge ausreicht, um das Schleifen unter Umständen bei einem einzigen Durchgang des mit der Schiene zu schleifenden Stückes und auf ein Viertel des Schraubenganges begrenzt durchzuführen, wobei die Endkanten am Beginn und Ende des Schraubenganges in orthogonalen Ebenen, d. h., die eine horizontal und die andere vertikal, liegen, daß die Bearbeitung des Gleitstückes derart vorgenommen ist, daß das Schleifband das zu schleifende Stück schräg (geneigt) angreift, daß der aktive Bereich in der V-Stellung zwischen dem horizontalen Arbeitstisch der Maschine und der vertikalen Fläche einer Längsführung liegt, daß der Gleitschuh auf einem beliebigen Radius der zu schleifenden Abrundung im Bezug auf zwei Bezugsebenen, gebildet durch den Tisch und die Führung, einstellbar ist, daß der Gleitschuh nachstellbar ist, um sich an die Größe der zu schleifenden Abrundung anzupassen und daß der Gleitschuh Mittel aufweist, die eine Verringerung der Reibung des Bandes auf ihm hervorrufen.
2. Maschine nach Anspruch 1, dadurch gekennzeichnet, daß die aktive Fläche des Gleitschuhes derart bearbeitet ist, daß die erzeugende der Schraubenfläche nicht genau senkrecht zur Längsachse des Gleitschuhes ist, sondern mit ihr einen Winkel von 90° minus a bildet, wobei a der Winkel zwischen Achse des Bandes und die Achse des Gleitschuhes ist, so daß diese winkelige Verstellung ein einwandfreies Freiwerden von Spänen unter Vermeidung einer schnellen Verschmutzung des Schleifbandes gewährleistet.
3. Maschine nach Ansprüche 1 und 2, zusammengenommen dadurch gekennzeichnet, daß die aktive Fläche des Gleitschuhes mit einem Polster aus einem Band aus weichem, graphitiertem Material versehen ist, welches das Gleiten des Schleifbandes auf dem Gleitschuh begünstigt, wobei das Polster, welches einen Verschleißteil bildet, leicht austauschbar ist.
4. Maschine nach die Ansprüche 1 bis 3 zusammengenommen, dadurch gekennzeichnet, daß parallel zu den Anfangs- und Endkanten der aktiven Fläche des Gleitschuhes und tangential zu ihnen zylindrische Rollen (7, 8) angeordnet sind, die mit etwas Abstand von der Oberfläche des graphitierten bandes liegen, mit dem Zweck, die Risiken des Verschleißes und Erhitzung des Schleifbandes an den Anfangs- und Endkanten des Gleitschuhes zu begrenzen.
5. Maschine nach Anspruch 4, dadurch gekennzeichnet, daß die Einstellung der Schleiffläche des Bandes in Höhe der Eingangsrolle (7) gegenüber der horizontalen Bezugsebene, gebildet durch den Tisch der Maschine, durch vertikale Verschiebung des vorderen Teiles der Gleitschuhabstützung erfolgt, daß die Einstellung der Schleiffläche des Bandes in Höhe der Abschlußrolle (8) gegenüber der vertikalen Bezugsebene, gebildet durch die Längsführung, durch horizontale Verschiebung des hinteren Teiles des Gleitschuhes erfolgt, wobei diese Einstellungen des Schleifbandes gegenüber den beiden Bezugsebenen eine vollkommen tangentiale Verbindung des Rundschleifens mit dem vorherigen Schleifen der anstoßenden, ebenen Flächen unabhängig von dem Radius der Abrundung zuläßt.
6. Maschine nach Anspruch 1, dadurch gekennzeichnet, daß die Steuerung der Einstellung der Bandschleiffläche in Abhängigkeit von der Größe des Radius der zu schleifenden Abrundung sich durch horizontale Verschiebung des vorderen Teiles der Gleitschuhabstützung in Höhe der Anfangsrolle und durch vertikale Verschiebung des hinteren Teiles der Gleitschuhabstützung in Höhe der Ausgangsrolle ergibt.
7. Maschine nach Anspruch 5 und 6 zusammengenommen, dadurch gekennzeichnet, daß die Gleitschuhabstützung aus einer Platte (14) besteht, auf der der Gleitschuh und die Anfangs-und Endrolle befestigt sind, wobei die Platte in ihrer Längsachse einen Langschlitz (18) aufweist, in dem bei senkrechter Stellung der Anfangswelle (7) das obere Ende einer Steuerschraube (9) für die vertikale Verschiebung des vorderen Teiles der Abstützung eingreift, die sich in einer Nuß (15) verdreht, dabei eine entgegendwirkend Feder (19) zusammendrückt, die eine Stabilität der vertikalen Einstellung der Anfangsrolle gegenüber der horizontalen Bezugsebene gewährleistet, wobei die Nuß zur horizontalen Verschiebung auf einer Stellschraube beweglich sitzt, deren Ende in einer Platine dreht, die auf dem Rahmen der Maschine befestigt ist, wobei die Schraube, der eine Druckfeder zugeordnet ist, die Regelung der Einstellung der Schleiffläche des Bandes in Abhängigkeit von der Größe des Radius der zu schleifenden Abrundung zuläßt, wobei diese Regelung in Verbindung mit einer zweiten Steuerschraube zur vertikalen Verschiebung erreicht wird, wobei diese Schraube aus der Verlängerung der Achse der Ausgangsrolle besteht mit Zuordnung einer Druckfeder und sich in einer beweglichen Nuß zur horizontalen Verschiebung auf einer Steuerschraube verschraubt, deren Ende in einer Platine dreht, die am Rahmen der Maschine befestigt ist und die die Einstellung der Ausgangsrolle gegenüber der vertikalen Bezugsebene zuläßt.
8. Maschine nach Anspruch 1, dadurch gekennzeichnet, daß der Gleitschuh auf einem schwimmenden Kopf montiert ist und die Einstellung des Gleitschuhes mittels Tastvorrichtung erfolgt, wobei auf die beiden orthogonalen Flächen des zu schleifenden Teiles Bezug genommen ist.
9. Vielfach-Bearbeitungsmaschine, in der als Abschlußstation wenigstens eine Rundschleifeinheit nach Anspruch 1 integriert ist, wobei diese Einheiten nacheinander auf die unteren und oberen Kanten bzw. Ecken des zu schleifenden Teiles derart einwirken, daß durch einen einzigen Durchgang desselben in der Maschine das gesamte Schleifen seiner geradlinigen Kanten bzw. Ecken erfolgt.
EP19810400632 1980-04-22 1981-04-21 Maschine zum Schleifen abgerundeter Ecken Expired EP0038763B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8009177 1980-04-22
FR8009177A FR2480662A1 (fr) 1980-04-22 1980-04-22 Machine polyvalente pour poncage des angles

Publications (2)

Publication Number Publication Date
EP0038763A1 EP0038763A1 (de) 1981-10-28
EP0038763B1 true EP0038763B1 (de) 1984-02-08

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EP19810400632 Expired EP0038763B1 (de) 1980-04-22 1981-04-21 Maschine zum Schleifen abgerundeter Ecken

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EP (1) EP0038763B1 (de)
DE (1) DE3162159D1 (de)
FR (1) FR2480662A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT202000032198A1 (it) * 2020-12-23 2022-06-23 Admina S R L Levigatrice a nastro manuale

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT384569B (de) * 1985-10-30 1987-12-10 Braun Michael Profilschleifmaschine
EP2322321A1 (de) * 2009-11-12 2011-05-18 Mevert Maschinenbau GmbH & Co.KG Bandschleifmaschine zum Bearbeiten gekrümmter Oberflächen
CN102689248A (zh) * 2012-06-06 2012-09-26 浙江金石家居用品有限公司 全自动餐叉倒角打磨机
CN111376152A (zh) * 2018-12-31 2020-07-07 帕玛自动化科技（苏州）有限公司 一种砂带侧压板打磨装置
CN114472562B (zh) * 2022-01-20 2024-05-17 无锡市普高精密机械科技有限公司 冲压模具耐磨冲针的高效、精密成型工艺方法及成型系统
CN114454046B (zh) * 2022-03-04 2022-11-22 深圳市锦瑞新材料股份有限公司 一种复合材料夹芯板自动加工系统

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2123269A (en) * 1937-03-03 1938-07-12 Gregory & Read Wood Heel Compa Method and apparatus for operating on heels
US2751524A (en) * 1952-03-08 1956-06-19 Hartmann & Braun Ag Moving coil instrument with stretched strip suspension
US2751724A (en) * 1952-12-26 1956-06-26 Smith Corp A O Belt grinding apparatus
US3327430A (en) * 1965-12-06 1967-06-27 Irving G Winer Internal cam finishing apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT202000032198A1 (it) * 2020-12-23 2022-06-23 Admina S R L Levigatrice a nastro manuale

Also Published As

Publication number Publication date
FR2480662A1 (fr) 1981-10-23
DE3162159D1 (en) 1984-03-15
EP0038763A1 (de) 1981-10-28
FR2480662B1 (de) 1982-05-07

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