Typewriter decimal tab mechanism

Decimal tab mechanism for a typewriter of the type having a printing element carried on a carriage moving parallel to a platen, said mechanism comprising a tab bar capable of being displaced longitudinally and comprising a series of tab blades which may be separately selected, activation means for activating the tab blades selected to place said selected tab blades in active position for cooperation with a carriage stop, an assembly of decimal tab stops each controlled by a key on a keyboard so as to be activated and made to cooperate with a tab bar stop, and a drive shaft connected by temporary coupling means to a continuously rotating machine function shaft, characterized in that the decimal tab mechanism comprises an apparatus for displacing the tab bar longitudinally ahead in the direction of typing, said apparatus being activated by the drive shaft by spring means, a first lever rotating around a stationary axis and disposed orthogonally to the rotation axis of the drive shaft, a control lever having a cam driving the means for activating the selected tab blade, said control lever and cam being integral with the drive shaft and acting on said activation means before the longitudinal displacement of the tab bar, a first angle plate swivelling around said stationary axis and having a nose which rests against the control lever, said spring means including a first spring urging said nose against said control lever, a second spring connecting said first angle plate to said first lever so that a rotation of the control lever is transmitted elastically to a rotation of the first lever cooperating with the tab bar, said first lever comprising clips which engage in an arm of an axle coaxial to the tab bar in such a way that a rotation of the first lever effects a sliding of said tab bar, and connection means between the drive shaft and the decimal tab stops, said connection means including devices for moving a selected decimal tab stop into active position only after longitudinal displacement of the tab bar.