AUTOMATIC SPRING DRIVE 3-DAY CHRONOGRAPH GMT

Caliber 9R96

Caliber 9R96 is a version of Caliber 9R86 specially adjusted to deliver an even higher level of precision. Caliber 9R86 delivers a precision rate of ±15 seconds per month (equivalent to ±1 second per day), whereas Caliber 9R96 delivers ±10 seconds per month (equivalent to ±0.5 second per day).
The difference between the two movements lies in the choice and testing of the quartz crystal oscillator. While all 9R Spring Drive movements use a quartz crystal oscillator in the regulator, only oscillators which exhibit particularly excellent performance are selected for use in Caliber 9R96.

The Spring Drive Chronograph may well be the world's most accurate spring-driven chronograph. It measures elapsed time not to the nearest fraction of a second but exactly, thanks to the fact that the glide motion hands stop at the very instant that the button is pressed. The 72 hour power reserve is maintained even if the chronograph is in operation.

The Grand Seiko lion in 18K gold graces the oscillating weight to symbolize the enhanced accuracy. 

Spezifikationen

Antriebssystem Automatic with manual winding
Ganggenauigkeit ±0.5 second per day (±10 seconds per month)
Gangreserve Approximately 72 hours
Steine 50 jewels
Bemerkungen -Power reserve indicator
-Dual time function with 24-hour hand
-Quick correction function of time difference adjusting to a calendar
-Stopwatch function

COLUMN WHEEL SYSTEM

Column Wheel System for Exact Operation of the Chronograph

A column wheel system is used to control the starting and stopping of the stopwatch. Its system ensures precise, error free control of the chronograph operation. The column wheel is designed to reduce stress on the clutch and lever, minimizing impact on the movement when the start/stop button is pushed.
The column wheel. The perfect start and stop mechanism

The column wheel. The perfect start and stop mechanism
  1. When you press the START button, the end of the action lever rotates the pillar wheel to the right.
  2. The rotating column wheel causes the end of the start-stop lever on the pillar to fall between the pillars, causing two closed start-stop levers to open.
  3. The clutch ring that is released by the two start-stop levers engages with a fourth gear wheel. (The fourth wheel is held against the clutch ring by the force of a spring.)
  4. The second hand of the stopwatch starts to move.

VERTICAL CLUTCH

A transmission system that ensures that the second hand does not jump when the START button is pressed

The vertical clutch system was created to prevent the second hand from jumping when the stopwatch START button is pressed. In the vertical clutch system, when the stopwatch START button is pressed, the start-stop lever opens, the fourth wheel and the clutch ring are engaged by the pushing force of the clutch spring, and the stopwatch begins to measure time.

The shuddering of the stopwatch that easily occurs with horizontal clutches is eliminated, and timekeeping is more accurate.

READY/START MODE

Greater Accuracy

Achieving a level of stopwatch accuracy equivalent to the accuracy of the Spring Drive caliber itself would not have meant much if this accuracy were lost in the operation of the stopwatch. To minimize time measurement errors when the chronograph buttons are pressed, the operation of the buttons was made as precise as humanly possible. A two-step READY/START mode was adopted to ensure that the stopwatch operation would be error-free. It is the same mechanism as is used in Seiko’s hand held stopwatches for professional sports use. The chronograph enters READY mode when the push button is lightly pressed. A further press then starts the stopwatch.

SCREW-LOCK BUTTON MECHANISM

Preventing Operational Error

The chronograph push-button uses a screw-lock mechanism. Turning the screw cover lowers a pipe inside, allowing the START button to be pressed. This newly developed mechanism prevents accidental operation of the button, resulting in more accurate time measurement.

Was macht die 9R Spring Drive so besonders?

Spring Drive ist eine der großen Innovationen in der Geschichte der modernen Uhrmacherkunst, denn sie besitzt ein federgetriebenes Uhrwerk mit modernster elektronischer Technologie, das ohne Batterien oder andere externe Energiequellen auskommt. Ihre einzige Kraftquelle ist eine Hauptfeder, die eine Reihe von Zahnrädern antreibt. Ein Rotor, der am Ende dieser Zahnräder angeschlossen ist, erzeugt eine kleine elektrische Ladung, die eine elektronische Schaltung und einen Quarzoszillator aktiviert. Ihre Genauigkeit ist beispiellos für eine Uhr, die von einer Aufzugsfeder aufgezogen wird. Die Entwicklung des 9R Spring Drive Uhrwerks war nur deshalb möglich, weil Grand Seiko eine der wenigen Marken ist, die sowohl auf dem Gebiet der mechanischen als auch der elektronischen Uhren über ein umfassendes Know-how verfügt.

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