Balance-spiral oscillation frequency control device for quartz-crystal watch, has stepping motor to which error signal is applied to correct position of regulator index such that precision of watch is same as that of received time signal

摘要

#CMT# #/CMT# The device has a bidirectional stepping motor placed between a plate and a dial of a horological movement. An error signal is obtained by comparing a real time provided by an external reference time signal with a time indicated by the movement based on counting of oscillation of an assembly of a balance (3) and a spiral (4) of the movement. The error signal is applied to the stepping motor to correct position of a regulator index (6) through a reduction gear train and by a regulator (5) such that precision of a watch in duration is same as that of the received time signal. #CMT#USE : #/CMT# Device for controlling oscillation frequency of a balance-spiral of a horological movement from an external reference time signal in a watch e.g. quartz-crystal watch (claimed). #CMT#ADVANTAGE : #/CMT# The error signal is applied to the stepping motor to correct position of the regulator index through the reduction gear train and by the regulator such that precision of the watch in the duration is same as that of the received time signal, thus ensuring effective controlling of the oscillation frequency of the balance-spiral of the horological movement with modification of useful length of the spiral. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a schematic view of a balance bridge supporting an assembly of a balance and a spiral by a shock absorbing bearing and a regulator integrated by friction with a regulator index whose rotation is controlled by a pinion placed at an end of an axle traversing a movement. 1 : Balance bridge 2 : Shock absorbing bearing 3 : Balance 4 : Spiral 5 : Regulator 6 : Regulator index.