Polishing and / or sanding head as well as polishing and / or sanding machine equipped with this head

Abstract

A polishing and / or sanding head 1 has a frame and three discs movably coupled to the frame. Of these discs, a first disc 5 forms a round inner disc and a second disc 7 is annular and surrounding the first disc. These first and second discs are concentric and rotatable in opposite directions about their common center. The third disc 9 is also annular and is present around the second disc. This third disc is not rotatable but can make a circular movement about an imaginary axis. The discs 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. Due to the presence of this third disc, which does not make a rotating but an eccentric movement, an even surface is obtained during polishing or sanding, on which no areas with a deviating appearance are present.

Description

Technical field of the invention

[0001] The invention relates to a polishing and / or sanding head for a polishing and / or sanding machine for polishing and / or sanding a surface, comprising: three concentric discs provided with a front, which during operation faces the surface to be treated and on which a polishing or sanding sheet can be applied, and a rear, as well as a coupling for coupling a driven shaft of the polishing and / or sanding machine to a first one of the discs, a transmission present between the first disc coupled to the driven axle and / or the coupling and a second one of the other discs, which transmission is such that the first and second discs rotate in opposite directions about a common center during operation, and a further transmission present between a third one of the discs and the coupling or one of the first and second discs.

[0002] A disc is understood here to mean both round and ring-shaped discs. For applying the polishing or sanding sheets to the discs, the front of the discs and the back of the polishing or sanding sheets may be provided with interlocking hooks, as is the case with Velcro.Background of the invention

[0003] A polishing and / or sanding head according to the preamble of claim 1 is known from US 6 032 313 A. This known polishing and / or sanding head has three concentric discs and a number of transmissions between the discs. One of the discs is attached to a driven shaft of a machine. This construction causes the discs to rotate in opposite directions. During polishing or sanding, 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 that there are areas on it that have an appearance different from other parts of the surface.Summary of the invention

[0004] An object of the invention is to provide a polishing and / or sanding head with which, when used in the same manner as the known polishing and / or sanding head, a more even polishing or sanding result is obtained than with the known polishing and / or sanding head. To this end, the polishing and / or sanding head according to the invention is characterized in that said further transmission is such that during operation the third disc does not rotate but makes a circular movement about an imaginary axis.

[0005] Due to the presence of a third disc, which does not make a rotating but an oscillating movement (in two directions at right angles to each other), a smooth surface is obtained on which no areas with a deviating appearance are present.

[0006] The first disc is the innermost disc, the second disc is annularly surrounding the first disc, and the third disc is annular and surrounding the second disc. The polishing and / or sanding head can be arranged in such a way that one of these discs can make a circular movement and the other two discs rotate. Preferably, however, the first and second discs are rotatable in opposite directions about their center and the third disc is capable of circular motion. This circular motion means that the disk is oscillable in two perpendicular directions so that each point of this disk makes a circular motion about an imaginary axis, where the distance of each point of this disk to the imaginary axis about which this point moves is for all points equal.

[0007] A constructively favorable embodiment of the polishing and / or sanding head is characterized in that: a first gear is mounted on the rear side of the first disc, this first gear and the first disc being concentric, an annular second gear with an external toothing and an internal toothing is mounted on the back of the second disc, this second gear and the second disc being concentric, between the first gear and the second gear there is at least one planet gear meshing with the first gear and with the internal teeth of the second gear, and the second transmission comprises at least one third gear meshing with the external teeth of the second gear, said third gear is connected via an eccentric to the third disc.

[0008] Preferably, the eccentric has a shaft that is eccentric with respect to the third gear and is coupled to the third gear and to the third disc. The shaft is preferably mounted on the third gear or on the third disc and is rotatably provided in an opening in the third gear and in the third disk respectively.

[0009] 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.

[0010] The invention also relates to a polishing and / or sanding machine comprising a drive provided with a driven shaft, as well as a polishing and / or sanding head according to the invention, of which the coupling is coupled to the driven shaft.Brief description of the drawings

[0011] The invention will be explained in more detail below on the basis of an exemplary embodiment of the polishing and / or sanding head according to the invention shown in the drawings. Hereby: Figure 1 shows the polishing and / or sanding head in top view; Figure 2 shows the polishing and / or sanding head in bottom view; Figure 3 shows the polishing and / or sanding head in side view; Figure 4 shows the polishing and / or sanding head in section along line I-I in Figure 1; Figure 5 shows the polishing and / or sanding head in section along line II-II in Figure 1; and Figure 6 the polishing and / or sanding head in exploded view. Detailed description of the drawings

[0012] Figures 1-3 show an embodiment of the polishing and / or sanding head according to the invention in top, bottom and side views, respectively. The polishing and / or sanding head 1 has a frame 3 and three discs 5, 7 and 9 movably coupled to the frame. Of these discs, a first disc 5 forms a round inner disc and a second disc 7 is annular and surrounds the first disc. These first and second discs 5 and 7 are concentric and rotatable in opposite directions about their common center 8. The third disc 9 is also annular and is provided around the second disc. This third disc 9 is not rotatable but can make a circular movement about 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.

[0013] Gears are present at the rear 5B-9B of the discs 5-9. In Figures 4 and 5 the polishing and / or sanding head is shown in cross section along the lines I-I and II-II respectively indicated in Figure 1 and in Figure 6 the polishing and / or sanding head is shown in an exploded view. The transmissions formed by the gear wheels between the discs will be explained below on the basis of these figures. Mounted on the back side 5B of the first disc 5 is a first gear wheel 11 which is provided with external teeth 11A. Mounted on the back side 7B of the second disc 7 is a second annular gear 13 which has an internal toothing 13A and an external toothing 13B. Between the external gearing 11A and the internal gearing 13A are three planet gears 15 provided with external gearing 15A.

[0014] The gears 11-15 form a first gear that is present between the first and second discs and causes the discs to rotate in opposite directions. The planet gears 15 are mounted in frame 3 by means of bearing blocks 16. Furthermore, three third gears 17 provided with external gears 17B are mounted in frame 3 by means of bearing blocks 18. These third gears 17 form a second transmission with the second gear 13. Pins 19 are mounted on these third gears 17, which are located away from the center of the gears 17 and form an eccentric. These pins are rotatably present in openings 20 in the third disc 9 and ensure that this third disc 9 makes an eccentric movement whereby his third disc 9 does not rotate about its center.

[0015] The first gear wheel 11 is coupled to a coupling piece 21 with which this gear wheel can be coupled to a driven shaft of the polishing and / or sanding machine. Also attached to the frame is a handle 23 with which the polishing and / or sanding head can be moved over the surface to be treated.

[0016] Although the invention has been elucidated in the foregoing with reference to the drawings, it should be noted that the invention is by no means limited to the embodiment shown in the drawings. The invention also extends to all embodiments deviating from the embodiment shown in the drawings within the scope defined by the claims.

Claims

1. Polishing and / or sanding head (1) for a polishing and / or sanding machine for polishing and / or sanding a surface, comprising: - three concentric discs (5, 7, 9) provided with a front (5A, 7A), which during operation faces the surface to be treated and on which a polishing or sanding sheet can be applied, and a rear (5B, 7B), as well as - a coupling (21) for coupling a driven shaft of the polishing and / or sanding machine to a first one of the discs (5), - a transmission (11A, 13A, 15A) present between the first disc (5) coupled to the driven axle and / or the coupling (21) and a second one of the other discs (7), which transmission is such that the first and second discs rotate in opposite directions about a common center during operation, and - a further transmission (13B, 17B) present between a third one of the discs (9) and the coupling (21) or one of the first and second discs (5, 7), characterized in that said further transmission (13B, 17B) is such that during operation the third disc (9) does not rotate but makes a circular movement about an imaginary axis.

2. Polishing and / or sanding head according to claim 1, characterized in that: - the first disc (5) forms an inner disc, - the second disc (7) is annular and is present around the first disc, and - the third disc (9) is also annular and is present around the second disc.

3. Polishing and / or sanding head according to claim 2, characterized in that the first and second discs (5, 7) can rotate in opposite directions about their center and each point of the third disc (9) can make a rotational movement about an imaginary axis, where the distance from each point to the imaginary axis about which this point revolves is the same for all points.

4. 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 disc (5), this first gear (11) and the first disc (5) being concentric, - an annular second gear (13) with an external toothing (13B) and an internal toothing (13A) is mounted on the back of the second disc (7), this second gear (13) and the second disc (7) being concentric, - between the first gear (11) and the second gear (13) there is at least one planet gear (15) meshing 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 (17) meshing with the external teeth (13B) of the second gear (13), said third gear (17) is connected via an eccentric (19) to the third disc (9).

5. Polishing and / or sanding head according to claim 4, characterized in that the eccentric (19) comprises a shaft eccentric with respect to the third gear (17) and being coupled to the third gear (17) and to the third disc (9).

6. Polishing and / or sanding head according to claim 5, characterized in that the shaft is mounted on the third gear (17) or on the third disc (9) and is rotatably provided in an opening (20) in the third gear or in the third disc, respectively.

7. 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 planet 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 provided with a driven shaft, as well as a polishing and / or sanding head (1) according to any one of the preceding claims, of which the coupling (21) is coupled to the driven shaft.

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