If the face plate is a face, then this face with a retrograde function is definitely the most expressive face, at every moment, the pointer bouncing back to the original moment, giving players more space to enjoy. Speaking of retrograde watches, in recent years, many watch manufacturers have produced a variety of retrograde watches, in the mechanical menu models, it seems to form a certain trend. The origin of retrograde functions, watchmakers in the middle of pocket watch development in order to demonstrate the creative use (about 1905), but the use of the watch, first appeared in 1997 by the Swiss independent watchmaking in Zurich PaulGerber in the BASEL watch exhibition published a retrograde watch Retrograde. This innovative design immediately aroused the attention of many people and aroused heated discussions in the next few years, many watch factory in response to market demand began to produce a retrograde watch. The retrograde functions on the market today are used for various display structures such as date, day of the week, hour, minute and second, respectively. However, if it is retrograde once a week, the user may miss such a wonderful screen, and therefore the easiest Show the beauty of retrograde, it should be a minute or 30 seconds retrograde function. To 30 seconds retrograde, the mechanical structure of the table within a day must withstand 2,880 times the bounce back action, the movement of the components within the mechanism of the anti-jumping mechanism is quite frequent and huge, so in the design These serious issues, such as stability and stress, must be emphasized very much. With the rapid development of CAD design today, these problems can be easily solved. The principle of the retrograde structure is mainly caused by the bouncing cam (a spiral metal reed) and the back-and-forth motion and reaction force between the return wheel and the wheel causing the gear to instantly rebound. Due to the number of rebounds mentioned before Very frequent, the stress concentration is too large, so the retrograde assembly in repeated motion, the metal fatigue and fault conditions than other functions of the mechanical structure is more likely to occur. Because the interaction between the bouncing cam and the backing wheel requires a medium as a support for the backing force, the source of this force is usually the use of a spring-loaded lever as a medium in a retrograde configuration, but the spring-loaded lever has a larger moment force , And the long-term back-up force often have the power shortage or unstable power phenomenon, and the bounce cam will also be too much stress concentration, resulting in wear and tear, deformation, at this time reverse skip seconds part of the time will appear Error, and most of the cases appear to delay bouncing (that is, slow seconds). In view of this, Paul Gerber, watchmaker in Zurich, came up with the idea of ​​replacing the spring lever with a hairspring. This problem was also solved. Because the hairspring in addition to having a round-trip back to the supply of stability, the aforementioned wear and tear rarely happen. Strictly speaking, the retrograde structure is an innovative design that violates the principle of mechanics. For this reason, the components are easily damaged when they are easily consumed. Although many people prefer to watch the frequent movement back and forth frequently every day, but the preference for retrograde watches, but in the purchase of such watches before the mechanical structure to deal with its problems than the average watch, which has a clear understanding.