Calendar mechanism for displaying the date and the day of the week in one timepiece

A calendar mechanism for displaying a date and a day of a week in a timepiece, comprising:

• a date indicator formed by a crown with an inner toothing;
• means for driving said date indicator including a first drive wheel having an external toothing so as to be able to be driven about an axis of rotation by a wheel set secured to an hour wheel of said timepiece, said external toothing comprising a prominent tooth and other teeth, said prominent tooth longer than said other teeth and disposed to abut against a tooth of the inner toothing of the date indicator to move it forward one day in a time interval located around a determined time of the day;
• a day of the week indicator;
• means for driving said day of the week indicator to move it forward one day during said time interval;
• means for positioning said indicators wherein said means for driving the day of the week indicator comprises a second drive wheel fitted with an external toothing, superposed and coaxial to the first drive wheel, wherein said first and second drive wheels have respective diameters that are equal and respective even numbers of teeth which are equal, said first and second drive wheels both engaging said wheel set secured to said hour wheel so as to be driven by said wheel set, wherein said wheel set is formed by a pinion secured to a pipe of said hour wheel and including a number of teeth equal to half of that of said first and second drive wheels, wherein said first drive wheel pivots on a fixed arbour and includes a hub from which extend a wide radial arm, an elastically deformable arm substantially in the shape of an arc of a circle, starting from a free end of said arm and extending in the normal rotational direction of said first drive wheel, said elastically deformable arm surrounding most of said hub to be attached via the interior and a substantially radial and rigid connecting part to a crown which carries said teeth;
• wherein said prominent tooth of the first drive wheel is separated from the tooth that precedes it when said wheel rotates in its normal rotational direction by a cut of said crown;
• and wherein, when said wheel rotates in the normal direction and when said prominent tooth comes into contact with a tooth of said date crown to drive the latter, said prominent tooth starts by remaining still while said elastically deformable arm tightens in the direction which brings it closer to said hub and that the width of said cut increases, until a front flank of said connecting part comes into contact with a back flank of said radial arm and said prominent tooth comes into contact with the tooth which precedes it, after which said prominent tooth drives said date crown to move it forward one day and then allow said drive wheel to return to its original form.