US 12,204,283 B2
Reciprocating display mechanism and timepiece
Shoichiro Morita, Saitama (JP); Riko Tsuboi, Tokyo (JP); Daisuke Yamada, Tokyo (JP); and Hiroyuki Takahashi, Nagano (JP)
Assigned to Citizen Watch Co., Ltd., Tokyo (JP)
Filed by CITIZEN WATCH CO., LTD., Tokyo (JP)
Filed on Aug. 17, 2021, as Appl. No. 17/445,304.
Claims priority of application No. 2020-138004 (JP), filed on Aug. 18, 2020.
Prior Publication US 2022/0057752 A1, Feb. 24, 2022
Int. Cl. G04B 19/02 (2006.01); G04B 19/04 (2006.01); G04C 10/04 (2006.01)
CPC G04B 19/02 (2013.01) [G04B 19/04 (2013.01); G04C 10/04 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A reciprocating display mechanism that performs predetermined display by reciprocating a hand within a fixed area, the reciprocating display mechanism comprising:
the hand capable of reciprocating within the fixed area;
a hand-driving wheel that drives the hand and comprises a first wheel, the first wheel comprising a first surface extending generally along a radius of the first wheel, the hand-driving wheel comprising a projection extending from the first surface;
a transmission wheel that rotates the hand-driving wheel by engaging with a tooth of the first wheel; and
a biasing member that biases the hand in one direction via the projection at a predetermined rotational position of the hand-driving wheel, wherein
the first wheel comprises an angle area corresponding to the fixed area and a region adjacent to the angle area, the angle area being provided with teeth and a part of the region adjacent to the angle area being provided with an idle region in which the transmission wheel idles, and
the one direction that biases by the biasing member is a direction in which the tooth adjacent to the idle region engages with the transmission wheel when the idle region faces the transmission wheel.