Handleiding Seiko 9RA5 (pagina 5 van 16) (Engels)

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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.

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.

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.

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.

Differences between the Spring Drive and

mechanical watch

For the Spring Drive, the mainspring is wound and

the unwinding power of the mainspring moves the

hands in the same manner as the mechanical watch.

It differs from the mechanical watch only in the

speed-regulating unit (mechanism for controlling

accuracy).

◎Temperature change

Accuracy of mechanical watches depends on a balance spring attached to a part called the

balance. This part has properties for expanding and contracting with temperature changes, and

influences the accuracy of a watch. Accuracy of the Spring Drive is never largely influenced by

temperature changes like that of mechanical watches since the crystal oscillator controls it.

(Note) Accuracy of the Spring Drive

Average monthly rate of ±10 seconds or ±15 seconds is the accuracy of a watch when

it is worn on a wrist at a temperature range between 5°C and 35°C.

◎Difference in position

For mechanical watches, the accuracy is influenced even by a difference in position or direction

of a watch. This is also caused by the balance that controls the accuracy of mechanical watches.

Due to the difference in position, the area where the shaft of the balance contacts with other

parts differs, and such differences in resistance influence the accuracy. As the Spring Drive

adopts a crystal oscillator not a balance, the accuracy is not influenced by a difference in

position.

◎Impact

Mechanical watches are susceptible to impacts. If a mechanical watch was subject to impact,

amplitude of vibration of the balance (angle for which the balance rotates right and left) is

changed, and even the form of the balance spring is changed. In this regard, the Spring Drive

is superior to mechanical watches in impact resistance because it adopts a crystal oscillator

not a balance.

◎Overhaul

Parts that become worn or severely damaged are the balance, pallet fork, and escape wheel

& pinion which are collectively called the speed-regulating unit or escapement. These parts

“come into contact or collide” mutually and control unwinding of the mainspring.

For the Spring Drive, wear and damage occur less than mechanical watches since the spinning

speed of the glide wheel is adjusted by a “contact-free” electromagnetic brake. However, as

the structure of gear train is the same as mechanical watches, abrasion powder may be

generated by contact of the wheels & pinions. An overhaul is recommend every three to four

years.

English

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