It comprises a dihedral support (7) provided with a large circular window (8) which extends through both faces of the support (7); immediately behind the window there is provided a disc (1) made of transparent or translucide flexible plastic material and provided at its periphery with a row of images (2) involved in the game of the machine, in a such a way that said disc (1) is retained by the support (7) through its periphery and is integral at its center with the shaft (3) of an electric motor, preferably a synchronous step motor which is appropriately controlled by means of a photoemitter-receiver. The rotation motion of the motor transmitted to the image-carrier disc (1) causes the latter to keep permanently a dihedral configuration due to its flexible nature. The viewer sees a line of images (2) according to a circumferential arc having an amplitude varying as a function of the occultation of the front face of the assembly. The disc can be applied also simultaneously to various machines, offering to all of them the corresponding images through their respective windows provided in the front face of each machine. When applying simultaneously the disc to various machines, it has two shoulders which are proximate and parallel to one of its diameter in order to define two substantially semicircular sectors, i.e. a front sector and a rear sector; the intermediary sector is used to mount the assembly to the corresponding body of the machine.
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