Clockwork mechanism and clockwork timepiece
A clockwork mechanism includes: a supporting member; a movable member including an engagement hole and movably supported by the supporting member; a drive pin engaging the engagement hole, including a flange portion for preventing the drive pin from disengaging from the engagement hole, and revolving to move the movable member; a biasing member provided in the movable member to partially overlap the engagement hole; and an abutment member abutting the movable member to restrict the movement of the movable member. The flange portion overlaps or does not overlap the biasing member depending on a revolving position of the drive pin. When the movable member abuts the abutment member, the drive pin pushes the biasing member and the movable member is biased toward the abutment member by the biasing member. When the flange portion does not overlap the biasing member, the drive pin moves the movable member to push the biasing member, allowing the drive pin to disengage from the engagement hole.
1. A clockwork mechanism comprising:
a supporting member;
a movable member including an engagement hole and movably supported by the supporting member;
a drive pin engaging the engagement hole, including a flange portion for preventing the drive pin from disengaging from the engagement hole, and revolving to move the movable member;
a biasing member provided in the movable member to partially overlap the engagement hole; and
an abutment member abutting the movable member to restrict the movement of the movable member,
wherein:
the flange portion overlaps or does not overlap the biasing member depending on a revolving position of the drive pin;
when the movable member abuts the abutment member, the drive pin pushes the biasing member and the movable member is biased toward the abutment member by the biasing member; and
when the flange portion does not overlap the biasing member, the drive pin moves the movable member to push the biasing member, allowing the drive pin to disengage from the engagement hole.
2. The clockwork mechanism of claim 1 , wherein:
the engagement hole has an oblong shape and includes a narrow area and a wide area;
the biasing member is arranged along an inner edge of the narrow area;
when the drive pin is located in the wide area and the flange portion does not overlap the biasing member, the drive pin moves the movable member to push the biasing member, allowing the drive pin to disengage from the engagement hole.
3. The clockwork mechanism of claim 2 , wherein the wide area allows the movable member to escape revolution of the drive pin.
4. A clockwork timepiece comprising a clockwork mechanism including:
a supporting member;
a movable member including an engagement hole and movably supported by the supporting member;
a drive pin engaging the engagement hole, including a flange portion for preventing the drive pin from disengaging from the engagement hole, and revolving to move the movable member;
a biasing member provided in the movable member to partially overlap the engagement hole; and
an abutment member abutting the movable member to restrict the movement of the movable member,
wherein:
the flange portion overlaps or does not overlap the biasing member depending on a revolving position of the drive pin;
when the movable member abuts the abutment member, the drive pin pushes the biasing member and the movable member is biased toward the abutment member by the biasing member; and
when the flange portion does not overlap the biasing member, the drive pin moves the movable member to push the biasing member, allowing the drive pin to disengage from the engagement hole.