CFB A1000 caliber that Drives Patravi EvoTec DayDate
Posted On Friday, October 30th, 2009 By admin
CFB A1000 caliber that Drives Patravi EvoTec DayDate
The interior of the Patravi EvoTec DayDate is brought to life by the CFB A1000 caliber. This movement represents a genuine technological evolution within the field of mechanical time measurement, as the name EvoTec expresses.
The most important characteristic of the CFB A1000 is its skilful synthesis of conventional and innovative elements. Tried and tested technology, such as the classic Swiss escapement and traditional train, is combined with a highly progressive caliber design that permits an unimpeded view of the bridges, bars and balance spring. What has made this possible is a not entirely new, but very different, way of positioning, guiding and structuring the rotor and self-winding system gear train. Quite deliberately, the watchmakers have turned away from the traditional central rotor, which always covers half of the movement and requires additional height. A micro-rotor integrated into the movement was also rejected, because it reduces the amount of space available for other components.
Thus, in the CFB A1000 caliber, the rotor runs around the entire periphery of the movement thanks to a mounting that is regarded by watchmakers as being one of the most demanding and challenging creations of all. For this reason, it has hardly ever been created successfully in the past. The ultimate advantage of this type of rotor is that it combines the technical values of the central rotor with the visual advantages of the micro-rotor. When it came to making the decision in favor of the “outrunner” principle used in the CFB A1000, all those responsible were aware of the fact that much – indeed if not all – would have to be rethought and intelligently designed from different perspectives. Continuing on the same old path was an option which was categorically rejected, not only at the Head Office in Lucerne but also in the technological center in the Jura. This creation thus represents an entirely new conception and design of self-winding mechanisms.
An initial difference (which, on closer examination, is in fact an essential difference) between this model and the usual tried and tested systems is the patented rotor mounting, which is assisted by DLC-coated rollers (Diamond-Like Carbon), which are themselves mounted on ball bearings. Although this “Diamond-Like Carbon” surface is only about a thousandth of a millimeter thick, it provides an extremely high level of resistance to wear and tear. Its hardness exceeds 2,000 Vickers, which makes it several times harder than steel, the customary material used.
The ball bearing / roller assemblies are mounted on rocking bars. Ingenious springs make for highly accurate positioning of the rollers, and eccentrics ensure precise adjustment of the bars.
A dynamic impact protection, known as DSA, has also been added. The Dynamic Shock Absorption system is outstandingly effective in all life situations. In the event of violent impact, the walls of the bridge limit the radial displacement of the rotor. The axial play is held in check by special screws, which thus prevents the rotor from banging against the bottom of the case.
As with any self-winding mechanism, the CFB A1000 must convert the high kinetic energy of its rotor into significant energy potential. This is carried out by a transmission wheel, which has been positioned between two Incabloc shock absorption systems to absorb violent impacts. To make optimal use of the energy, the peripheral rotor supplies energy when turning in either direction. The rotor’s movements are polarized by a low-loss winding system, which consists of two intelligently designed clutch wheels with eccentrically mounted clamp rollers. The motor spring stores energy for approximately 55 hours of power reserve. Yet this by no means exhausts the innovative potential of the CFB A1000. The frequency of the indispensable vibrating and escapement system is three Hertz, which corresponds to 21,600 vibrations per hour. The main focus of investment has been on the patented “Central Dual Adjusting System” (CDAS), a carefully thought-out precision adjustment system featuring a central control element. The system (“Repère”) requires adjustment only once, after which it is secured in position and thus protected from impact. To guarantee the system’s long-term quality, precision adjustment can only be carried out using a special key issued exclusively to authorized service centers. The balance and stem are bearing-mounted at both ends by Incabloc shock absorption systems, for experience shows that these guarantee optimum control of the end play.
Naturally, Carl F. Bucherer also guarantees that its movement benefits from the highest quality decoration. The bridges and bars at their various levels have matt and brushed surfaces with diamond-cut facets. The high optical quality of other components is also ensured by matt, brushed or polished surfaces.
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