Patent ID: 8724430

Claim:
A retrograde display mechanism comprising: a retrograde display mechanism main body including a time value driving wheel that has a time value driving tooth portion and time value finger which advance a time value including a date or a day and that rotates once every day, a time value transmitting wheel that has a time value transmitting wheel tooth portion and a drive cam portion which are rotated by one tooth every day by the time value finger of the time value driving wheel, a fan-shaped wheel operating lever that has a cam follower portion and a fan-shaped wheel operating tooth portion which are elastically pressed against the drive cam portion of the time value transmitting wheel to be engaged with the drive cam portion, and a fan-shaped wheel that has a fan-shaped wheel tooth portion and a fan-shaped wheel display portion which mesh with the fan-shaped wheel operating tooth portion of the fan-shaped wheel operating lever to rotate in response to the rocking of the fan-shaped wheel operating lever, in which the fan-shaped wheel rapidly rotates reversely to return to an initial position whenever the end of the month or the end of the week passes; a fan-shaped wheel jumper that jumps and stops the fan-shaped wheel tooth portion of the fan-shaped wheel; and setting releasing means that releases a setting set by the fan-shaped wheel jumper whenever the end of the month or the end of the week passes.