METHOD AND CONSTRUCTION FOR AUTOCALIBRATING A BIDIRECTIONAL DISPLAY HAND IN AN ELECTRONIC TIMEPIECE

WIPO Patent Application WO/2004/104712

A1

A method of calibrating a display hand in an electronic timepiece. The method comprises the steps of initializing a counter; stepping the rotor of the stepping motor a predetermined number of steps in a first direction and incrementing the counter; determining whether the counter is less than a predefined value representing at least the sum of the maximum number of steps needed from a zero position on the display to the maximum value on the display and the number of steps needed from the zero position on the display to the position such that a channel formed in one of the one or more gears would abut against a tab; and if so, stepping the rotor of the stepping motor the predetermined number of steps in the first direction, incrementing the counter and again determining whether the counter is less than the predefined value; and if not, rotating the rotor of the motor in a direction opposite the first direction the same number of steps needed from the zero position on the display to the position such that the channel would abut against the tab. Several calibration assembly constructions are also provided.

STOTZ GERHARD
PLANCON MICHEL G
ZACHMANN HELMUT

PCT/EP2004/004548

December 02, 2004

April 29, 2004

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TIMEX GROUP BV (NL)

G04B19/08; G04C3/14; G04C17/00; (IPC1-7): G04C3/00; G04C17/00

US4314146A	1982-02-02
EP0122621A2	1984-10-24
US5335211A	1994-08-02
US5673238A	1997-09-30
US7133450B2	2006-11-07
US5335211A	1994-08-02
US4314146A	1982-02-02
US33402502A	2002-12-30
US33182702A	2002-12-30
US7023762B1	2006-04-04

Boydell, John Christopher (Halton House 20/23 Holborn, London EC1N 2JD, GB)

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