EP0002145B1 - Schleifmaschine mit schmalem Schleifband - Google Patents

Schleifmaschine mit schmalem Schleifband Download PDF

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Publication number
EP0002145B1
EP0002145B1 EP78400162A EP78400162A EP0002145B1 EP 0002145 B1 EP0002145 B1 EP 0002145B1 EP 78400162 A EP78400162 A EP 78400162A EP 78400162 A EP78400162 A EP 78400162A EP 0002145 B1 EP0002145 B1 EP 0002145B1
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EP
European Patent Office
Prior art keywords
frame
grinder according
shaft
oscillation
fixed
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.)
Expired
Application number
EP78400162A
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English (en)
French (fr)
Other versions
EP0002145A1 (de
Inventor
Jean-Marie Guisez
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guilliet SA
Original Assignee
Guilliet SA
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Filing date
Publication date
Application filed by Guilliet SA filed Critical Guilliet SA
Publication of EP0002145A1 publication Critical patent/EP0002145A1/de
Application granted granted Critical
Publication of EP0002145B1 publication Critical patent/EP0002145B1/de
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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
    • 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
    • B24B21/10—Machines or devices using grinding or polishing belts; Accessories therefor for grinding plane surfaces involving a rigid member, e.g. pressure bar, table, pressing or supporting the belt over substantially its whole span

Definitions

  • the present invention relates to a narrow belt sanding machine, intended essentially for sanding wooden pieces.
  • a narrow belt sanding machine comprises, in a known manner, a horizontal work table adjustable in height, intended to receive the parts to be sanded, an endless abrasive belt placed above the table transversely to the direction of advance of the parts, suspended between two drums and driven by one of them, and a shoe suspended from a support, capable of pressing on the lower strand of the strip.
  • a more improved sanding machine in which the pressure pad is replaced by a pressure beam which occupies the entire width of the work table and which is controlled by a pneumatic or hydraulic cylinder.
  • Such a machine of course allows very higher feed speeds, but it has the disadvantage that the abrasive belt wears very quickly, because it works continuously over its entire width, and that it undergoes very significant heating, because she doesn't have time to cool down.
  • the object of the invention is to provide a narrow belt sanding machine for industrial production which does not have the drawbacks indicated and which consequently ensures prolonged use and satisfactory cooling of the abrasive belt.
  • the invention therefore relates to a narrow belt sanding machine comprising a frame, a horizontal table, linked to the frame and adjustable in height, for the reception of the pieces to be sanded, two drums, two supports connected to the frame and supporting in rotation these drums, one of the supports comprising a drive motor, an endless abrasive belt stretched between these drums and disposed above the table, and a pressure beam connected to the frame and arranged to press by its lower surface on the lower end of the strip, this machine being characterized in that the drum supports are connected to the frame so as to allow the drums, and therefore the strip, to effect an oscillating movement transverse to the direction of movement of the strip, and the lower surface of the beam has in cross section the shape of an arc centered on the axis of oscillation.
  • the heating is much less violent because only a limited area of the strip is active at a given time, and the other parts of the strip have time to cool.
  • the drum supports are integral with an axis supported in rotation by the frame.
  • the beam is suspended from at least one support integral with said axis.
  • the beam thus performs the same oscillation movement as the strip, which prevents transverse friction between the beam and the abrasive strip from being superimposed on the friction due to the movement of the strip.
  • the sanding machine shown in the drawing comprises a frame 1, a horizontal table 2 carried by the frame for receiving pieces of wood such as B, and a set or sanding head suspended from the frame and which will be described in detail below. -after.
  • Table 2 is not the subject of the present invention, and it will simply be indicated here that it must be adjustable in height so as to accept pieces of wood of different thicknesses.
  • the table is constituted by a drive belt 3 stretched between two drums 4 and moving in the direction of the arrow A to advance the workpiece B under the sanding head.
  • the supports of these drums are adjustable vertically from a flywheel 5 by means not shown.
  • a fixed guide 6 forming a stop for the pieces of wood.
  • many other types of tables can be used, in particular fixed tables associated with rollers for driving wooden pieces, roller tables, air cushion tables, etc.
  • the upper part of the frame is formed by uprights 8 and 9 which carry an axis 10 by means of respective bearings 11 and 12.
  • This axis 10 supports the sanding head consisting of the two drums 20 and 21 between which a band is stretched endless abrasive 22, and a pressure beam 40.
  • the drum 20 is driven in the direction of the arrow C by a motor 23, preferably an electric motor, fixed to a support 24 itself fixed by any means at one end (located on the left in FIG. 1) of the axis 10.
  • the drum 21 is supported in rotation by a support 25 fixed to the other end (situated on the right in FIG. 1) of the axis 10.
  • a cover 28 used to extract the wood dust is fixed to the support 24.
  • the axis 10 is driven in a relatively slow oscillatory movement and of small amplitude by an appropriate drive mechanism, generally designated by 30 and fixed on a part 31 of the frame.
  • the mechanism 30 comprises, in the case shown, a geared motor 32 driving a crank plate 33.
  • a connecting rod 34 is fixed, on the one hand, to the plate 33, on the other hand, at one end of a lever 35 whose l the other end surrounds the axis 10 and is fixed thereto.
  • the rotation of the plate 33 causes an alternating movement of the connecting rod 34 which causes the desired oscillation movement of the lever 35 and of the axis 10, this movement being symbolized by the double arrow in FIG. 3. It should be emphasized however that any mechanism giving the desired oscillation movement could be used.
  • the axis 10 further supports the pressure beam 40 by means of support arms 41 of a particular shape.
  • This beam 40 has the same transverse dimension as the drive belt 3. Its lower surface, which is the surface in contact with the abrasive strip 22a, seen in cross section (cf. FIGS. 2 and 3), the shape of a arc of a circle having its center the center of the axis 10, and therefore remains constantly tangent to the same horizontal plane so that the sanding is carried out by the band 22 in a perfectly regular manner during the above-mentioned oscillation movement.
  • the amplitude of oscillation of the sanding head must be such that the attack of the piece of wood by the abrasive belt occurs correctly for any instantaneous angle of oscillation, in particular in the extreme positions.
  • This condition defines a maximum value which depends on the width of the abrasive strip, or more precisely on the arc defined by the strip.
  • an oscillation of + 8 ° can be expected, with an oscillation period of approximately 1 s.
  • Such an amplitude allows a wood grip (thickness of the material removed) of 1 mm maximum. A larger wood grip can be obtained with a reduced amplitude of oscillation.
  • the extreme positions taken by the support arms 41 during the oscillations are indicated in dashed lines in FIG. 3.
  • the beam 40 carries at its ends rollers 45, 46 used for shaping the strip.
  • rollers are mounted idly on arms 47, 48 fixed to the beam 40 and have a shape such that they always present the strip with a surface identical to that of the beam 40. It is therefore a surface of revolution at constant curvature, which can be seen in FIG. 2.
  • the arms 47, 48 are arranged so that the plane tangent to the lower surface of the beam 40 is also tangent to the rollers 45, 46.
  • These rollers avoid deformation transverse of the strip 22. It should be noted in this regard that the drums 21 and 22 have only a very slight curvature, just necessary to hold the strip in place, and therefore clearly less than that of the lower surface of the beam 40.
  • the support arms 41 which connect the beam 40 to the axis 10 have a C shape, shown in Figure 3, so as to allow passage to the upper strand of the strip 22.
  • the fixing of the beam on the underside arms 41 are carried out in a known manner, for example by screws.
  • the material constituting the beam can be rigid or flexible depending on the requirements. If it is a calibration, i.e. a very precise job, a rigid material must be used, for example steel, wood, plastic, etc. In the case of surfacing, a flexible material such as rubber will be preferable.
  • the lower surface of the beam 40 with a coating of material suitable for friction, for example graphite, to reduce heating caused by the rapid movement of the abrasive strip 22.
  • the speed of movement of the strip 22 is in fact between 15 and 30 m / s.
  • a possibility of adjusting the height of the sanding head is given by the use, for the bearings 11 and 12 carrying the axis 10, of eccentric bearings.
  • the angular position of the bearing 11 can be defined from the adjustment lever 13 via the axis 14 and the connecting rod 15.
  • the angular position of the other bearing 12 is automatically adjusted identically via of the connecting bar 16, which remains blocked by a lever 17 once the adjustment has been made.
  • the adjustment stroke is very limited, for example of the order of 1 mm, but it makes it possible to compensate for the differences in roughness of the abrasive belts. This results in a constant wood grip, whether the strip is fine-grained or coarse-grained.
  • FIG. 4 shows an advantageous alternative embodiment, in which the drive motor 50 of the belt 3 is used to control the oscillation movement of the sanding head.
  • the motor 50 drives the drum 4 by means of a reduction gear 51.
  • the drum 4 is extended on the side opposite to the drive by a shaft 52 on which a crank 53 is fixed. Towards the end of the latter is pivotally mounted a connecting rod 54 also pivotally mounted at its other end on a lever 55 fixed to the support arm 41.
  • the rotation of the drum 4 while driving the belt will cause a continuous oscillation movement of the head sanding.
  • This embodiment has the advantage of not requiring a particular motor for controlling the oscillation.
  • the connecting rod 54 and the lever 55 are placed in the interval which separates the belt 3 from the upright of the frame.
  • the invention is not limited to the embodiments described. Thus, one could provide, instead of automatic control, manual control of the oscillation movement. It would suffice in this case to attach a lever such as the lever 55 of FIG. 4 to the support arm 41 and to mount at the lower end of this lever an operating handle moving in a slot or light passing through the upright of the frame and having the shape of an arc centered on the axis of oscillation.
  • Means may also be provided for blocking the lever in a given position, for example a threaded rod fixed on the lever in the vicinity of the handle and also engaged in the aforementioned slot, and a nut screwed onto the threaded rod, which can be tightened against the upright of the frame to immobilize the lever.

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

Claims (11)

1. Maschine zum Schleifen schmaler Streifen, bestehend aus einem Rahmen (1), aus einem horizontalen, auf dem Rahmen abgestützten, höhenverstellbaren Tisch (24) zur Aufnahme der zu schleifenden Teile (B), aus zwei Rollen (20, 21), aus zwei mit dem Rahmen (1) verbundenen Stützen (24, 25), an denen die Rollen (20, 21) drehbar gelagert sind, wobei eine der Stützen (24, 25) einen Antriebsmotor (23) trägt, aus einem endlosen, über die beiden Rollen (20, 21) gespannten, oberhalb des Tisches (2) angeordneten Schleifband (22) und aus einem am Rahmen abgestützten Anpreßbalken (40), welcher mit seiner Unterseite gegen das Untertrumm des Schleifbandes (22) andrückbar ist, dadurch gekennzeichnet, daß die Stützen (24, 25) der Rollen (20, 21) derart mit dem Rahmen (1) verbunden sind, daß die Rollen (20, 21) und folglich das Schleifband (22) eine Oszillation quer zur Laufrichtung des Schleifbandes (22) ausführen können, und daß die Unterseite des Anpreßbalkens (40) einen kreisbogenförmigen Querschnitt mit in der Achse der Oszillation liegendem Kreismittelpunkt aufweist.
2. Schleifmaschine nach Anspruch 1, dadurch gekennzeichnet daß die Stützen (24, 25) für die Rollen (20, 21) starr an einer Welle (10) befestigt sind, welche drehbar im Rahmen (1) gelagert ist.
3. Schleifmaschine nach Anspruch 2, dadurch gekennzeichnet, daß die Welle (10) durch eine am Rahmen (1) abgestützte Antriebseinrichtung in eine Oszillationsbewegung angetrieben ist.
4. Schleifmaschine nach Anspruch 3, dadurch gekennzeichnet, daß die Antriebseinrichtung (30) für die Welle (10) ein am Rahmen (1) angeordnetes Übersetzungsgetriebe (32), eine Anordnung aus Kurbelscheibe (33) und Pleuelstange (34), die durch das Übersetzungsgetriebe (32) angetrieben wird, und einen Hebel (35) umfaßt, welcher starr an der Welle (10) befestigt ist und dessen freies Ende and die Pleuelstange (34) angeschlossen ist.
5. Schleifmaschine nach Anspruch 2, dadurch gekennzeichnet, daß der Anpreßbalken (40) an mindestens einem Stützarm (41) aufgehängt ist, welcher starr an der Welle (10) sitzt.
6. Schleifmaschine nach Anspruch 5, dadurch gekennzeichnet, daß der oder die Stützarme (41) C-förmig ausgebildet sind und den Durchgang des Obertrumms des Schleifbandes (22) ermöglichen.
7. Schleifmaschine nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß auf beiden Seiten des Anpreßbalkens (40), in Laufrichtung des Schleifbandes (22) gesehen, lose Rollen (45, 46) angeordnet sind, welche die gleiche Krümmung wie die Unterseite des Anpreßbalkens (40) aufweisen.
8. Schleifmaschine nach Anspruch 5, dadurch gekennzeichnet, daß sie einen Hebel (35, 55) aufweist, welche an einen der Stützarme (41) des Anpreßbalkens (40) an einem Ende angeschlossen ist und welche an seinem anderen Ende, zur Erzielung der Oszillationsbewegung des oder der Stützarme (41) des Anpreßbalkens (40) und der starr an der Welle (10) sitzenden Stützen (24, 25) der Rolle (20, 21), antreibbar ist.
9. Schleifmaschine nach Anspruch 8, bei welchem der Aufnahmetisch (2) von einem endlosen Band (3) gebildet ist, welches zwischen einer führenden Rolle (4) und einer geführten Rolle beweglich ist, dadurch gekennzeichnet, daß eine Kurbel (53) an der Welle (52) der führenden Rolle (4) angelenkt ist und daß eine Pleuelstange (54) mit ihren jeweiligen Enden an dem Hebel (55) und der Kurbel (53) angelenkt ist.
10. Schleifmaschine nach Anspruch 8, dadurch gekennzeichnet, daß das freie Ende des Hebels (55) einen Griff trägt, welcher in eine Fensteröffnung des Rahmens hineinragt, die die Form eines Kreisbogens besitzt, dessen Mittel-punkt die Welle (10) der Oszillation bildet.
11. Schleifmaschine nach Anspruch 5, dadurch gekennzeichnet, daß die Welle (10) drehbar in exzentrischen Lagerböcken gelagert ist.
EP78400162A 1977-11-14 1978-11-02 Schleifmaschine mit schmalem Schleifband Expired EP0002145B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7734173A FR2408428A1 (fr) 1977-11-14 1977-11-14 Machine a poncer a bande etroite
FR7734173 1977-11-14

Publications (2)

Publication Number Publication Date
EP0002145A1 EP0002145A1 (de) 1979-05-30
EP0002145B1 true EP0002145B1 (de) 1981-07-01

Family

ID=9197570

Family Applications (1)

Application Number Title Priority Date Filing Date
EP78400162A Expired EP0002145B1 (de) 1977-11-14 1978-11-02 Schleifmaschine mit schmalem Schleifband

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EP (1) EP0002145B1 (de)
DE (1) DE2860814D1 (de)
ES (1) ES475066A1 (de)
FR (1) FR2408428A1 (de)
IT (1) IT1100087B (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6569002B2 (en) 1999-12-10 2003-05-27 Porter-Cable/Delta Hand-held oscillating spindle sander

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2064476A (en) * 1931-07-25 1936-12-15 Gustave T Johnson Abrading machine
FR1165605A (fr) * 1955-12-13 1958-10-28 Corning Glass Works Machine à meuler
US3529384A (en) * 1967-04-21 1970-09-22 Carborundum Co Sanding machine
US4038784A (en) * 1976-05-07 1977-08-02 Acrometal Products, Inc. Method and apparatus for cross grain abrading to produce a rough-sawn effect

Also Published As

Publication number Publication date
EP0002145A1 (de) 1979-05-30
FR2408428B1 (de) 1982-12-03
IT7829559A0 (it) 1978-11-08
IT1100087B (it) 1985-09-28
ES475066A1 (es) 1979-04-01
FR2408428A1 (fr) 1979-06-08
DE2860814D1 (en) 1981-10-08

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