A motor group including motor modules, each including a motor device driving a display wheel set, with a center pipe fixed on a plate, including a device for rotational guiding, about a main axis, of a display wheel set internal or external to the center pipe, this module includes an axial stop arranged to limit to a predetermined value the axial play in the direction of the main axis between the center pipe and the display wheel set, wherein a protruding surface of the center pipe or of the display wheel set, or an added axial stop, captively mounted between the center pipe and the display wheel set, or fixed to the display wheel set.

A motor group including motor modules, each including a motor device driving a display wheel set, with a center pipe fixed on a plate, including a device for rotational guiding, about a main axis, of a display wheel set internal or external to the center pipe, this module includes an axial stop arranged to limit to a predetermined value the axial play in the direction of the main axis between the center pipe and the display wheel set, wherein a protruding surface of the center pipe or of the display wheel set, or an added axial stop, captively mounted between the center pipe and the display wheel set, or fixed to the display wheel set.