Spring Drive Mechanism
2
The power of the mainspring is regulated by electronic control.
That is the essence of the Spring Drive.
What controls the accuracy of a mechanical watch is
the balance spring, a part of the speed-regulating unit, called the balance.
This part influences the accuracy to some extent
because it is made of metal which expands and contracts with changes in temperature.
The Spring Drive is
completely different from a mechanical watch in this speed-regulating unit.
The Spring Drive is powered by a mainspring, but adopts an electronic speed-regulating unit comprising
a generator,
IC circuit
, and
crystal oscillator
.
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In a little more detail,
at the end of the train wheel that moves the hands, a series of speed increasing wheels with a glide wheel are provided.
The unwinding power of the mainspring rotates the glide wheel, generating electricity in the coil to drive the crystal
oscillator and IC.
The IC controls the spinning speed of the glide wheel by applying and releasing
the electromagnetic brake
, while
comparing the accuracy of the electric signals generated by the crystal oscillator and the spinning speed of the glide
wheel.
In addition, by making the energy transfer of the train wheel efficient and adopting an IC that drives with low power
consumption, power reserve far exceeding normal mechanical watches is realized.
An unprecedented drive system which offers
quartz accuracy
.
This is the Spring Drive.
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11
Spring Drive Mechanism
3
Here is the step-by-step description of the Spring Drive in an easy-to-
understand manner.
This is how the Spring Drive works.
1
Mainspring
The mainspring is wound by rotation of the oscillating weight (or by turning
of the crown), and its unwinding power is the sole power source.
2
Gear train • hands
The unwinding power of the mainspring is transmitted via the gear train to
move the hands. No motor or battery is mounted.
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3
Tri-synchro regulator
The unwinding power of the mainspring also rotates the glide wheel. This
generates small electricity in the coil to drive the IC and crystal oscillator. At
the same time, an electric magnetic field is generated on the glide wheel.
The IC detects the spinning speed of the glide wheel based on the accuracy
of the electric signals of the crystal oscillator, and adjusts the spinning speed
of the glide wheel while applying and releasing the electromagnetic brake.
Mainspring
Coil
Tri-synchro regulator
Glide Wheel
IC
Crystal Oscillator
Oscillating
Weight
* The illustration above is a schematic diagram showing a standard spring drive mechanism.
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Содержание Spring Drive 9R01
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