Polishing and / or sanding head and polishing and / or sanding machine equipped with such head

Abstract

A polishing and / or sanding head 1 has a frame and three discs movably coupled to the frame. In these disks, a first disk 5 forms a circular inner disk and a second disk 7 is annular and surrounds the first disk. The first and second discs are concentric and rotatable in opposite directions about their common center. The third disc 9 is also annular and surrounds the second disc. The third disk is non-rotatable, but can do circular motion about an imaginary axis. The disc is provided with a front side 5A-9A, which faces the surface to be treated during operation, and on which a polishing or sanding sheet can be applied. Due to the presence of the third disk which does not perform rotational movement but performs eccentric movement, a uniform surface is obtained during the polishing or sanding process, and there is no area of appearance deviation thereon.

Description

Technical Field

[0001] The present invention relates to a polishing and / or sanding head for a polishing (polishing, grinding) and / or sanding (sanding, sand grinding) machine, which is used for polishing and / or sanding a surface, and comprises:

[0002] at least two concentric discs having a front part and a rear part, the front part facing the surface to be treated during operation and on which a polishing or sanding disc can be applied, and

[0003] - a coupling for coupling the driven shaft of a polishing and / or sanding machine to one of the discs, and

[0004] - a transmission between the disc and / or the coupling coupled to the driven shaft and the other disc, which during operation causes the two discs to rotate in opposite directions about a common centre.

[0005] "Disc" is understood here to mean both circular and annular discs. In order to apply the polishing or sanding disc to the disc, the front of the disc and the back of the polishing or sanding disc can be provided with interlocking hooks, like Velcro. Background Art

[0006] A polishing and / or sanding head according to the preamble of claim 1 is known from CH 652 065 A. This known polishing and / or sanding head has two concentric disks, each provided with an outer toothing and an inner toothing, and a plurality of planetary gears between the two teeth. These planetary gears are coupled to a central shaft via a transmission, which central shaft can be coupled to a driven shaft of a machine. This arrangement causes the disks to rotate in opposite directions. During the polishing or sanding process, the polishing and / or sanding head is moved over the surface to be treated. It has been found that the treated surface is not completely smooth, but has areas thereon which have an appearance different from the rest of the surface. Summary of the invention

[0007] An object of the present invention is to provide a polishing and / or sanding head with which, when used in the same manner as known polishing and / or sanding heads, a more uniform polishing or sanding result is obtained than with known polishing or sanding heads. To this end, the polishing and / or sanding head according to the present invention is characterized in that:

[0008] - a polishing and / or sanding head comprising three discs, two of which constitute a component and another of which is connected to a coupling or to one of the two discs via another transmission,

[0009] - During operation said further transmission means causes said further disk not to rotate but to perform a circular movement about an imaginary axis.

[0010] Due to the presence of the third disk, which does not rotate but performs an oscillating movement (in two directions at right angles to each other), a smooth surface is obtained, on which there are no areas with a deviating appearance.

[0011] Of these disks, the first disk is the innermost disk, the second disk surrounds the first disk annularly, and the third disk is annular and surrounds the second disk. The polishing and / or sanding head can be arranged so that one of the disks can perform a circular motion, while the other two disks rotate. However, preferably, the first disk and the second disk can rotate in opposite directions around their center, and the third disk can perform a circular motion. This circular motion means that the disk can oscillate in two perpendicular directions, so that each point of the disk performs a circular motion around an imaginary axis, wherein for all points, each point of the disk is at an equal distance from the imaginary axis around which the point moves.

[0012] A structurally advantageous embodiment of the polishing and / or sanding head is characterized in that:

[0013] - a first gear is mounted on the rear side of the first disc, the first gear being concentric with the first disc,

[0014] - an annular second gear with external and internal teeth mounted on the back of the second disc, the second gear being concentric with the second disc,

[0015] - between the first gear and the second gear there is at least one planetary gear which meshes with the first gear and with the internal teeth of the second gear, and

[0016] The second transmission comprises at least one third gear wheel meshing with the external toothing of the second gear wheel, said third gear wheel being connected to the third disc via an eccentric.

[0017] Preferably, the eccentric part has a shaft which is eccentric to the third gear and connected to the third gear and the third disk. The shaft is preferably mounted on the third gear or the third disk and is rotatably arranged in openings in the third gear and in the third disk, respectively.

[0018] The polishing and / or sanding head preferably has a frame, wherein the at least one planetary gear and the at least one third gear are rotatably connected to the frame.

[0019] The invention also relates to a polishing and / or sanding machine comprising a drive equipped with a driven shaft, and a polishing and / or sanding head according to the invention, the coupling of which is coupled to the driven shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The invention will be explained in more detail below based on exemplary embodiments of the polishing and / or sanding head according to the invention shown in the accompanying drawings, wherein:

[0021] Figure 1 The polishing and / or sanding head is shown in top view;

[0022] Figure 2 The polishing and / or sanding head is shown in bottom view;

[0023] Figure 3 The polishing and / or sanding head is shown in side view;

[0024] Figure 4 Along Figure 1 The cross-sectional view along line II in FIG. 1 shows a polishing and / or sanding head;

[0025] Figure 5 Along Figure 1 The cross-sectional view along line II-II in FIG. 1 shows a polishing and / or sanding head; and

[0026] Figure 6 The polishing and / or sanding head is shown in an exploded view. DETAILED DESCRIPTION

[0027] Figure 1-Figure 3 An embodiment of a polishing and / or sanding head according to the invention is shown in a top view, a bottom view and a side view, respectively. The polishing and / or sanding head 1 has a frame 3 and three discs 5, 7 and 9, which are movably connected to the frame. Of these discs, the first disc 5 forms a circular inner disc, and the second disc 7 is annular and surrounds the first disc. The first disc 5 and the second disc 7 are concentric and can rotate in opposite directions around their common center 8. The third disc 9 is also annular and is arranged around the second disc. The third disc 9 is not rotatable, but can perform a circular motion around an imaginary axis. The discs 5-9 are provided with a front side 5A-9A, which faces the surface to be treated during operation and on which a polishing or sanding sheet can be applied.

[0028] The gear is located at the rear 5B-9B of the disc 5-9. Figure 4 and Figure 5 In order to Figure 1 The cross-sectional views along line II and line II-II shown in FIG. 1 show a polishing and / or sanding head. Figure 6, a polishing or sanding head is shown in an exploded view. Based on these figures, the transmission formed by the gears between the disks will be explained below. A first gear 11 is mounted on the back side 5B of the first disk 5, the first gear being provided with external teeth 11A. A second ring gear 13 is mounted on the back side 7B of the second disk 7, the second ring gear having internal teeth 13A and external teeth 13B. Three planetary gears 15 are located between the external gear 11A and the internal gear 13A, the planetary gears being provided with external gears 15A.

[0029] The gears 11-15 form a first gear which is present between the first and second discs and rotates the first and second discs in opposite directions. The planetary gears 15 are mounted in the frame 3 by means of a bearing block 16. Furthermore, three third gears 17 equipped with external gears 17B are mounted in the frame 3 by means of a bearing block 18. These third gears 17 together with the second gear 13 form a second transmission. Pins 19 are mounted on these third gears 17, which are located away from the center of the gears 17 and form an eccentric portion. These pins are rotatably present in the opening 20 of the third disc 9 and ensure that the third disc 9 performs an eccentric movement so that the third disc 9 does not rotate around its center.

[0030] The first gear 11 is coupled to a coupling 21, by means of which the gear can be coupled to a driven shaft of a polishing and / or sanding machine. Also attached to the frame is a handle 23, by means of which the polishing and / or sanding head can be moved over the surface to be treated.

[0031] Although the invention has been described above with reference to the drawings, it should be noted that the invention is by no means limited to the embodiments shown in the drawings. The invention also extends to all embodiments that deviate from the embodiments shown in the drawings within the scope defined by the claims.

Claims

1. A polishing and / or sanding head (1) for a polishing and / or sanding machine, for polishing and / or sanding a surface, the polishing and / or sanding head comprising: - at least two concentric discs (5, 7) having a front part (5A, 7A) and a rear part (5B, 7B), the front part facing the surface to be treated during operation and to which a polishing or sanding disc can be applied, and - a coupling (21) for coupling the driven shaft of the polishing and / or sanding machine to one of the discs (5), and - a transmission device (11A, 13A, 15A) between the disc (5) coupled to the driven shaft and / or the coupling (21) and the other disc (7), which during operation causes the two discs to rotate in opposite directions around a common centre, Features: - the polishing and / or sanding head comprises three discs (5, 7, 9), two of which (5, 7) form a unit and the other disc (9) is connected to the coupling (21) or to one of the two discs (5, 7) via another transmission (13B, 17B), - During operation, the further transmission means (13B, 17B) cause the further disk (9) not to rotate but to move in a circular motion around an imaginary axis.

2. The polishing and / or sanding head according to claim 1, characterized in that: The plate: - the first disk (5) forms the inner disk, - a second disk (7) is annular and is present around said first disk, and - A third disc (9) is also annular and is present around said second disc.

3. The polishing and / or sanding head according to claim 2, characterized in that: The first and second disks (5, 7) are rotatable in opposite directions about their centers, while each point of the third disk (9) is capable of rotational movement about an imaginary axis, wherein the distance from each point to the imaginary axis about which the point rotates is the same for all points.

4. The polishing and / or sanding head according to claim 1, 2 or 3, characterized in that: - a first gear (11) is mounted on the rear side of the first plate (5), the first gear (11) and the first plate (5) being concentric, - a second annular gear (13) with external teeth (13B) and internal teeth (13A) mounted on the back of the second disk (7), the second gear (13) and the second disk (7) being concentric, - between the first gear (11) and the second gear (13), there is at least one planetary gear (15), which meshes with the first gear (5) and with the internal teeth (13A) of the second gear (13), and The second transmission (13B, 17B) comprises at least one third gear wheel (17) meshing with the external toothing (13B) of the second gear wheel (13), the third gear wheel (17) being connected to the third disc (9) via an eccentric (19).

5. The polishing and / or sanding head according to claim 4, characterized in that: The eccentric portion (19) includes a shaft which is eccentric relative to the third gear (17) and is coupled to the third gear (17) and the third disk (9).

6. The polishing and / or sanding head according to claim 5, characterized in that: The shaft is mounted on the third gear (17) or the third disk (9) and is rotatably arranged in an opening (20) in the third gear or in the third disk, respectively.

7. The polishing and / or sanding head according to claim 4, 5 or 6, characterized in that The polishing and / or sanding head comprises a frame (3), and the at least one planetary gear (15) and the at least one third gear (17) are rotatably connected to the frame.

8. Polishing and / or sanding machine comprising a drive equipped with a driven shaft, and a polishing and / or sanding head (1) according to any one of the preceding claims, the coupling (21) of the polishing and / or sanding head being coupled to the driven shaft.

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