Since the ETA in 1976, launched a 2892-type movement, the movement experienced a 2892-2892-2-2892 – A2 evolution.
2892-A2 to use the most advanced science and technology, both in materials or construction of movement have shown that excellent quality, reached a near-perfect world.
2892 – A2 is characterized by stability, durability, easy maintenance, a little adjustment, the precision needed to achieve the Swiss official Observatory standards; and movement of smaller sizes, thinner, making it easy to expand the outreach function. More than 30 years, 2892 to withstand a variety of tests. It uses a powerful testimony to the fact that there is no doubt that he is the history of Swiss watch movements, one of the most classic. Although some movement in the accuracy and durability and it could be a match, but in the overall quality has won it no one can. Whether an independent tabulation of people, or the top major brands, are used as the basis for the production of watch movements.
The original dynamic system
2892 – A2 of clockwork clockwork boxes occupied 75% of the space (usually the old movement for 50%). As the spring is the source of dynamic movement, need to have sufficient torque, the 2892 – A2 of clockwork hard. This requires an automated system to improve the efficiency of the winding to counter hard-line generated by the main winding resistance, to this end, 2892 – A2 to use the micro-gear ETA. This invention by ETA special tooth-type was also used in tooth and teeth on the shaft. It can be to minimize friction, to improve the efficiency of power train.
Transmission System
2892 – A2 gear train layout will be the first round, second round 3 and (4) arrangements have been in the same line, near the escapement wheel slightly. 2 is not placed in the center, which is designed to stop the wheel from wear and tear caused by card round pin card phenomenon. This layout is generated by the direct effects of the movement to enhance the stability of performance, but also can save wear and tear at the time of power transmission, and the wind-up torque in the drive transmission components will not affect the swing. 2892 – A2 part of the calendar structure is simple, yet durable, in the absence of additional components can be achieved under the calendar instantaneous jump, but also in terms of meshing gears or a state of separation can be adjusted under the date will not damage any parts. This means that in any moment, people can freely adjust the date.
Winding dial needle system
2892 – A2-type movement of a diameter of 25.6 millimeters, J high 3.6 millimeters, 21 rubies. Motherboards, substrates, plywood and brass plate using the traditional materials. 2892 – A2 prototype is Nianhua Yee (Eterna) in 1962 before and after the introduction of the 1466U-type movement. Its automatic winding movement axis Tuo before the department’s application of the five steel ball bearings for the drive, use the five gears and a double round to change the direction of momentum transfer. Steel ball bearings placed not only increased the flexibility of running Tuo, but also reduce the failure rate and, more importantly, can improve the efficiency of automatic winding. 2892 – A2′s larger steel ball bearings, which means better support substrates, also means a better place Tuo earthquake.
2892 – A2 will automatically tighten into the main part of the splint, so that automatically tighten and be part of round plywood boxes at the same horizontal plane. In order to increase the relative weight placed Tuo, 2892 – A2 reduces the slope of the edge before Godot. At the same time, Ruby automatically replace the wheel on mass shoot par, will automatically tighten the top part of splint rod tip replaced with precious stones. Such a replacement is to reduce the associated gear train between the friction coefficient. All of these technical means are aimed to improve automatically tighten around efficiency, while thinner movement.
Escapement speed control system
2892 – A2 is the pendulum frequency 28,800 times / hr. Balance wheel using beryllium copper alloy (Glucydur) made of a diameter of 9 mm; gossamer gossamer for Nivarox flat, eccentric screw tuning. Eccentric screw to fine-tune the processing speed of the needle based on the traditional structure. Gossamer and outside it by adjusting the angle of the gap between the pile to control the effective length of gossamer and thus achieve accuracy is simple, quick adjustments. Eccentric screw adjustment is limited to fine-tune the error within 5 seconds.
Functions and processes
In addition to scientific and rational structure on the outside, 2892 – A2 Another advantage of functionality that is highly scalable, simple to increase the module group, will be able to have the time, big date, power storage, GMT, moon and stars, the two asked , calendar, calendar and other functions. ETA movement in accordance with the manufacturer’s position, 2892 – A2 in the product chain belonging to high-end level, to invest in the manufacturing cost is higher. 2892 – A2 main basis of polished pearl stripes, sun light radiation pattern and before the Geneva stripes Tuo.
The best choice for everyday wear
Since the ETA of 2892 – A2 more stringent control, usually only select those high-level brand. Therefore, as daily-wear, as long as the choice of a loaded 2892 – A2 movement of the watch, would certainly not go wrong.