Seiko 9R65, 9R15 manual Mainspring, Gear train hands, Tri-synchro regulator

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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

1 The mainspring is wound by rotation of the rotor (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.

 

Tri-synchro regulator

 

The unwinding power of the mainspring also rotates

 

the glide wheel. This generates small electricity in

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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.

Rotor

Mainspring

Glide Wheel

IC

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 ±15 seconds (equivalent to daily rate of ±1 second)※ is the accuracy of a watch when it is worn on a wrist at a temperature range between 5℃ and 35℃.

※For Cal. 9R15, the average monthly rate is ± 10 seconds (equivalent to daily rate of ±0.5 second).

◎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.

English

Coil

Crystal Oscillator

For the Spring Drive, wear and damage occur less than mechanical watches since the spinning speed of the rotor is adjusted by a“contact-free” electromagnetic brake. However, as the structure of gear train is the same

Tri-Synchro Regulator

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as mechanical watches, abrasion powder may be generated by contact of the wheels & pinions. An overhaul is recommend every three to four years.

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Contents JSYGS9R1-1302 Spring DriveContents History of Spring Drive Spring Drive Mechanism ① Tri-synchro regulator MainspringGear train hands Water resistance How to check the caliber numberAbout the caliber number Precautions for diving 9R65, 9R15 Diver’s models Hour hand Second hand Crown Power reserve Date Indicator9R65, 9R15 Regular models 9R86, 9R84 9R66 Regular model9R66 Model with a rotating bezel How to read the power reserve indicator Power reserve indicatorCrown Screw-lock type crownTips for more accurate time setting How to wind the main springDate adjustment at the end of the month How to set the time and dateBefore using the stopwatch function How to use the screw-lock type buttonNames of the chronograph parts and their function Screw-lock type buttonAccumulated elapsed time measurement How to use the stopwatch function② If your watch has screw-lock Working Type buttons, unlock themHow to measure average speed of your vehicle How to use the tachymeterHow to compute productivity rate per hour How to set the time and calendarHow to set the calendar How to use the time difference adjustment function How to use the 24-hour handTime difference adjustment function Selectable display mode How to use the bi-directional rotating bezelWhen daylight saving time is observed On the rotating bezelList of time zone differences in major regions of the world How to use the rotating bezelUnidirectional rotating bezel How to use the diver adjuster Diver adjusterAfter-sale service Replacement partsDaily care GuaranteeMagnetic resistance Magnetic influence BandMetallic band Leather bandLumibrite TroubleshootingIf your watch has Lumibrite Reference data on the luminanceSPECIFICATIONS（Movement）

9R15, 9R65 specifications

The Seiko 9R series is a remarkable line of mechanical watches featuring Spring Drive technology, a hallmark of precision and innovation. Among its esteemed models, the 9R65 and 9R15 movements stand out for their unique characteristics and advancements.

The 9R65 movement is known for its impressive power reserve of up to 72 hours, which is significant for a watch powered by a spring-driven mechanism. This makes it extremely reliable for everyday wear, as users can take the watch off for a weekend without worrying about it stopping. One of the most notable features of the 9R65 is its smooth and continuous movement of the second hand, a signature of Spring Drive technology. Instead of ticking like traditional mechanical watches, the 9R65 provides a seamless glide, offering a visual experience that is both captivating and elegant.

On the other hand, the 9R15 movement, while sharing some similarities with the 9R65, takes the craftsmanship a step further with its chronograph function. This feature allows users to accurately measure elapsed time, making it ideal for sports enthusiasts and those who require precision timing. The 9R15 has a power reserve of approximately 60 hours, ensuring that it maintains its functionality over an extended period. Its robust design is complemented by the familiar Spring Drive mechanism, ensuring that while it offers additional functionality, it does not compromise on the smoothness and reliability typical of Seiko.

Both movements utilize Seiko’s advanced Spring Drive technology, which combines the best elements of mechanical and quartz watchmaking. This unique hybrid system allows for unparalleled accuracy, with variations of just one second per day, which is exceptional for a mechanical watch. Furthermore, the 9R series features a durable construction, incorporating high-quality materials such as stainless steel and ceramic, enhancing their longevity and resistance to wear.

In conclusion, the Seiko 9R65 and 9R15 movements exemplify the brand’s commitment to innovation, precision, and durability. Whether you prefer the minimalist elegance of the 9R65 or the added complexity of the chronograph in the 9R15, both options promise an exceptional blend of technology and artistry that showcases Seiko's prowess in horology. These movements not only cater to the demands of modern watch enthusiasts but also pay homage to the intricate traditions of watchmaking, making them a desirable choice for collectors and aficionados alike.
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