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. 

Specifiche

Movimento Automatic with manual winding
Precisione ±0.5 second per day (±10 seconds per month)
Riserva di carica Approximately 72 hours
Rubini 50 jewels
Funzioni -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.

Cosa rende speciale Spring Drive 9R?

Spring Drive, una delle maggiori innovazioni nella storia dell'orologeria moderna, regola un movimento alimentato a molla provvisto di una tecnologia elettronica all'avanguardia che funziona senza batterie o altre fonti di energia esterna. La sua unica fonte di energia è una molla, che aziona una serie di ingranaggi. Un rotore, collegato alla fine di questi ingranaggi, genera una piccola carica elettrica che attiva un circuito elettronico e un oscillatore al quarzo. La sua precisione è senza precedenti per un orologio alimentato da una molla. Lo sviluppo del movimento Spring Drive 9R è stato possibile solo grazie al fatto che Grand Seiko è uno dei pochi produttori con esperienza sia nel campo degli orologi meccanici che di quelli elettronici.

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