Display device in or for use in a timepiece

Details Display device in or for use in a timepiece Display device in or for use in a timepiece

1992-10-15

1993-06-08

Miska, Vit W.

Horology: time measuring systems or devices

With calendar indicator

Movable ring or disk

G04B 1920

Patent

active

052185788

ABSTRACT:
The display of n+m symbols is achieved by means of an upper disk (1a), placed behind an aperture (2) in a cover plate, and of a lower disk (1b), placed behind the upper disk and comprising m sectors.
One sector of the upper disk (1a) consists of a transparent window (4), the other n+m sectors of the two disks bearing the symbols.
A gear-train (11, 12a, 12b, 13a, 13b) and a control cam (20), set in motion by a rotary driving member (10), cause the disks to rotate in steps of one sector, starting from a position in which the window (4) is located behind the aperture (2), such as to cause first the two disks to move forward together by one step, then the upper disk (1a) to move forward n successive steps, and finally the lower disk (1b) to move forward m-1 successive steps to return to the starting position.
A positioning device (30a, 30b, 31a, 31b) blocks the disks (1a, 1b) when they are stationary, and releases them when required to move forward.

REFERENCES:
patent: 2976672 (1961-03-01), Ducommun
patent: 3901017 (1975-08-01), Erni et al.
patent: 4026100 (1977-05-01), Kume et al.
patent: 4674889 (1987-06-01), Klaus

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