Timepiece display apparatus, movement, and timepiece
AssigneeSeiko Epson Corporation
InventorsImao Hiraga, Shigeyuki Fujimori, Yoichi Hayashi, Kenichi Okuhara
Life of this patent
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Abstract
A timepiece display apparatus causes a day hand to move reciprocally by means of center wheel, driven day wheel, cam, lever, and rack. These wheels, cam, lever, and rack can be easily arranged to fit the available space on the main plate of the movement, and the construction of the display apparatus can thus be simplified. Furthermore, locating the cam between the rotary shaft and rack of the lever portion enables arranging a plurality of parts more compactly than if the cam is disposed to a different location, and affords a simple assembly.
Claims17
A display apparatus for a timepiece, comprising:
- a drive wheel that is rotated by a power source;
- a transfer wheel that is driven by the drive wheel;
- a driven wheel that is driven by the transfer wheel;
- a cam fixed to said driven wheel and rotates with said driven wheel;
- a lever that can move circularly and is urged in contact with the cam;
- a rack that moves according to rotation of the cam by means of the intervening lever;
- and
- a pinion that rotates in conjunction with the rack and to which an indicating member can be attached;
- wherein referenced to a hypothetical arc centered on the rotary axis of the lever and passing through the rotary axis of the cam, the rack is disposed on the opposite side of the arc as the center of the arc;
- the rotary axis of the cam is located between the rack and the rotary axis of the lever;
- and
- wherein the lever forms a closed-loop around the cam.
Dependencies are inferred from the claim text.