Title: Calendar mechanism of a portable timepiece

Abstract: A calender mechanism comprising a cannon wheel having a gear wheel portion and a cylindrical portion extending axially from the gear wheel portion, a day star wheel mounted for rotation on a cylindrical portion of the cannon wheel, and a positioning plate. The day star wheel has an outer diameter less than that of the gear wheel portion of the cannon wheel, and the positioning plate is positioned to partially overlie the outer peripheral portion of the gear wheel portion for preventing the cannon wheel from traveling axially toward the day star wheel. The portion of the positioning plate overlying the outer peripheral portion of the cannon wheel does not extend between the day star wheel and the gear wheel portion of the cannon wheel.

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Inventors: Ikenishi, Masataka (Tokyo, JP)
Miyazaki, Joichi (Tokyo, JP)
Kushida, Shozo (Tokyo, JP)
Nakanishi, Hiromasa (Tokyo, JP)

Application Number: 906561
Filing Date: 1978-05-16
Publication_date: 1980-05-27
Assignee: Kabushiki Kaisha Daini Seikosha (JP)
Primary Class(es): 368/35 368/221, 968/171, 968/172, 968/DIG1
Other Classes:
US Patent Ref:

3659412	May, 1972	Miyasaka et al.	58/4.
3765162	Oct, 1973	Ushiyama et al.	58/4.
3819929	Apr, 1975	Charbonnet et al.	58/5.
3916614	Nov, 1975	Takatsuki	58/59.
3939645	Feb, 1976	Charbonnet	58/58.

Other Refs: 1023415

Jan, 1958	DE

Primary Examiner: Miska, Vit W.
Assistant Examiner:
Attorney: Burns; Robert E., Lobato; Emmanuel J., Adams; Bruce L.