Since CarlF. Bucherer launched the CFBA1000 movement in 2009, the outer rotor has become increasingly popular. Generally, the winding rotor is installed in the center of the movement and rotates on it; the outer edge of the rotor is not the same. The winding rotor is ring-shaped and is installed and swings around the movement. This is an ingenious and stylish solution that not only gives a clear overview of the movement of the case back, but also makes it possible to design thinner automatic winding watches.
In 2009, the Bucherer CFBA1000 became the first mass-produced outer oscillating weight movement.
Paul Gosteli’s Outer Edge Rotor Patent N ° 322325
The concept of a oscillating rotor is not new. In June 1955, Paul Gosteli from Geneva applied for a patent (Swiss patent N ° 322325, filed in June 1955, published July 31, 1957), which described a ‘rotary rotor around a movement The frame features a ‘window winding system.’
Patek Philippe patent for outer oscillating weight
Patek Philippe Calibre350 rim rotor
Similarly, about ten years later, Patek Philippe applied for a patent for a self-winding movement (Swiss patent N ° 548213, filed on June 15, 1965, published on February 29, 1968), which includes a ‘ring-shaped winding rotor … the oscillating weight and the related gear train are placed on the outer edge of the movement ‘. The Calibre350 oscillating weight movement was born. This movement involved many technical challenges. The winding oscillating weight rotates on the outer edge. The traditional spindle and crown cannot be used, so the crown has to be installed on the back side.
2009-Suibao Qilai Revival
The PaulGosteli patent and Patek Philippe patent mentioned above, the crown is placed on the back side of the case; Bao Qilai conceived an efficient and convenient technical solution to return the crown and the stem to the traditional position (3 o’clock), the outer edge The rotor concept was introduced into modern mass production. Bucherer utilizes three small DLC-coated roller bearings equipped with ceramic rolling bearings to drive the outer oscillating weight. Ceramic rolling bearings need no lubrication and can be wound in both directions.
Bucherer Marie Dragon Double-Edge Tourbillon Case Back
Bucherer Marie Dragon Edge Power Watch (43mm Model) Case Back
Bucherer Marie Dragon Watch
Bucherer first realized this ingenious concept on the CFBA1000 movement (2009), then the CFBA2000 (2016, an improved version of CFBA1000, aimed at mass production), and the latest CFBT3000 equipped with an outer tourbillon. Movement (2018), the three movements are all independently designed and manufactured by the Baucherle Linnold watch factory.
With the development of the outer oscillating weight concept, in recent years, many brands have applied this design to their movements (mainly high-end movements), such as Dewitt, Vacheron Constantin, Breguet and Audemars Piguet. The creation of a thin automatic watch by the outer oscillating weight also helped a lot. In 2017, Piaget became the world record holder for the thinnest automatic (mechanical) watch. The Altiplano UltimateAutomatic watch is only 4.30 mm thick and is equipped with a 910P movement. The oscillating weight is placed on the outer edge of the movement and partially mounted under the bezel to save space in the watch.
Piaget Altiplano Ultimate Automatic 910P
Only a few months later, BVLGARI set two records with a single watch, the OctoFinissimo Automatic Tourbillon watch, the thinnest automatic watch and the thinnest tourbillon watch. The thickness of the entire watch is only 3.95 mm. Thanks to the outer rotor, the thickness of the self-winding movement is exactly the same as the non-automatic version, but with a larger diameter. The watch has a button at 4 o’clock, alternating time and winding.
BVLGARI OctoFinissimo Automatic Tourbillon watch
BVLGARI Calibre BVL288 movement
Cartier proposes another interesting and clever application scheme for winding the outer rotor. The outer oscillating weight of the 9603MC movement is not only able to wind the watch, it has also been shaped into a beautiful appearance, and is presented to the wearer’s wrist with a fresh attitude every moment. For example, Cartier launched the Rencontrede Panthères watch at the SIHH2018 in Geneva. The watch moves the outer oscillating weight from the rear of the movement to the top of the dial, and is decorated with two cheetahs composed of diamonds and a ring. When the oscillating weight swings, the two cheetahs in the center of the dial seem to wrestle around a ring. .
Cartier Rencontrede Panthères
The outer oscillating weight is undoubtedly one of the main innovations in the automatic winding mechanism. Today, more and more brands are adopting this stylish and technically complex solution. The outer oscillating weight combines various advantages: slim, efficient winding (for example, more efficient than a miniature oscillating weight), unobstructed view … from this perspective, the outer oscillating weight will soon be used This is also a logical prediction for more ‘mid-range’ watches. Of course, Bucherer has proven that the price of watch products using this mechanism can be relatively affordable. (Edited by Xu Chaoyang, the home of the watch / text watch)