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

Polishing and/or sanding head (1) for a polishing and/or sanding machine for polishing and/or sanding a surface, comprising:

• at least two concentric discs (5, 7) 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 one of the discs (5), and
• a transmission (11A, 13A, 15A) present between the disc (5) coupled to the driven axle and/or the coupling (21) and the other disc (7), which transmission is such that the two discs rotate in opposite directions about a common center during operation, wherein:
• the polishing and/or sanding head comprises three discs (5, 7, 9) of which said two discs (5, 7) form part and of which the other disc (9) is connected via a further transmission (13B, 17B) to the coupling (21) or to one of the said two discs (5, 7),
• said further transmission (13B, 17B) is such that during operation the other disc (9) does not rotate but makes a circular movement about an imaginary axis.