In 1999, Robert Greubel and Stephen Forsey left Renaud & Papi to work independently and in 2001 they founded CompliTime, with the aim of creating and developing complication mechanisms for the key brands. They co-founded Greubel Forsey in 2004. They decided to undertake various watchmaking challenges and to initiate a revival in terms of architecture and fine craftsmanship, as well as with regards to innovation and the improvement of performance. They realised that they shared the same spirit and the same vision of the future of fine watchmaking.
We are sculptors of time, choreographers of the passing hours and architects of watch movement - with a screwdriver for a brush, a propelling-pencil for a quill, and steel or gold as our supports.
Robert Greubel and Stephen Forsey
Double Tourbillon 30°
Inside a cage which rotates in four minutes, the interior cage containing the balance and spring assembly is inclined at an angle of 30° relative to the first cage and completes a revolution in sixty seconds. The combination of the 30° inclination with the different rotational speeds of the two tourbillons improves timekeeping by averaging out positional errors due to gravity in all usual wristwatch position and especially in stable positions.
Each of the four tourbillons connected to a spherical differential contributes independently to obtain a precise and reliable timing rate especially in stable positions. The spherical differential transmits the average timing rate of the four tourbillons, thus improving the chronometric performance of all the regulating organs.
Tourbillon 24 Secondes
The Tourbillon 24 Secondes uses a fast rotation speed and inclined angle to solve the problem of critical positions of the oscillator in relation to gravity. The 25° angle and the rapid rotation of the tourbillon cage significantly improve the chronometric performance of a system containing only one tourbillon, especially in stable positions. Consequently, we had to develop an inclined gearing profile and an ultra-light tourbillon cage to resolve the considerable mechanical constraints imposed by this system.
The Différentiel d’Égalité is based on a spherical differential that receives energy from the mainspring barrel and releases it in constant amounts to the regulating organ. In order to maintain this constant rate, the mainspring barrel powers a secondary spring, which is rewound once every second. Placed just before the regulating organ, the spring ensures uniform transmission of energy and eliminates torque variations from the mainspring barrel, correcting any variations in torque generated by the gear train.
In order to obtain the average timing rate in a stable position, we explored using the Double Balancier, i.e. two oscillators positioned along two different axes at precise predetermined angles. Thanks to the combined effects of the spherical differential and the angle of the balances, this system helps to minimise the effects of gravity and maximise timing precision in stable positions.
The Mechanical Computer
Our mechanical computer of the QP à Equation reinterprets certain functions of ancient astronomical clocks. It is a set of coding wheels superimposed in a coaxial manner with movable programmed fingers. Depending on their rotation speeds and number of teeth, these wheels provide a variety of information (moths with 30/31 days and leap years [February 28/29 days]).
The mechanical computer also directly drives a system of sapphire disks, which display the equation of time. This new invention is composed of 25 parts and is the subject of three new patents.
The 935 parts composing this timepiece have been housed in a space measuring 43.5 mm in diameter and 16.13 mm in height; it is well and truly our most complex creation to date. The movement is wound manually, but the striking mechanism features a self-winding system.
The minute repeater and its additional ringing mechanism sounds, on demand, the exact time, to the minute. This timepiece has three striking modes: Grande Sonnerie ( strikes the hours and quarters in passing), Petite Sonnerie (strikes the full hours in passing) and Silent (does not strike in passing). The chime of the Grande Sonnerie is enhanced by an acoustic resonance cage made from titanium. The incorporation of eleven safety features ensures maximum peace of mind.