Patent ID: 7961556

Claim:
A day display apparatus comprising: a first day display wheel having a program tooth portion; a second day display wheel having a claw wheel portion and a gear portion being rotatable coaxially with respect to the first day display wheel; a second day display wheel jumper having a jump-and-stop claw portion and a spring portion, the jump-and-stop claw portion performing a jump-and-stop operation with respect to the claw wheel portion of the second day display wheel under an action of the spring portion; a day intermediate wheel engaging the gear portion of the second day display wheel and being configured to be rotated by the program tooth portion of the first day display wheel every time when the first day display wheel reaches a predetermined rotational position and transmit the rotation to the second day display wheel; and a jump-and-stop control means which assumes a rotation restrained state which restrains the jump-and-stop claw portion from coming apart from between adjacent claw portions of the claw wheel portion when the jump-and-stop claw portion of the second day display wheel jumper is in a restrained position of being fitted between the adjacent claw portions of the claw wheel portion of the second day display wheel and assumes a rotation allowing state which allows the jump-and-stop claw portion to come apart from the adjacent claw portions of the claw wheel portion and climb over the claw portion of the claw wheel portion so as to allow the rotation of the second day display wheel every time when the first day display wheel reaches the predetermined rotational position.