Patent ID: 8040759

Claim:
A timepiece having a device that assists in maintaining a position of a date indicator disc, comprising: a date indicator disc; a jumper spring arranged to index a position of the date indicator disc; a locking lever movable between a first position and a second position, wherein, in the first position, outside a date indication correction phase, the locking lever is positioned to lock the jumper spring, and wherein, in the second position, in the date indication correction phase, the locking lever is disposed away from the first position to release the jumper spring; a control wheel that completes one revolution in 31 days; a gear train kinematically connecting the control wheel to the date indicator disc; and a toothed wheel, driven by the gear train, and disposed to move the locking lever between the first position and the second position, wherein the locking lever comprises two diametrically opposite arms, one of which abuts against the jumper spring and the other of which abuts against the toothed wheel.