24 hours a day is 1440 minutes, which is 86400 seconds. If the daily difference is 17 second, it is two ten thousandths, even if the daily difference is 34 seconds, it is only four ten thousandths. This difference is very small. The fast and slow hand in the movement is an angle adjusting device that can rotate around the center of the pendulum shaft. The rotation of this device is about 3/360 of the rotation circumference, and the daily difference 120s can be controlled. If the day difference is 30 seconds, then Aauto Quicker and the slow hand only need to rotate within the range of 1 degree.
It is conceivable that it is very difficult for the fast and slow hands with a radius of about 3 ~ 4 mm to rotate less than 1 degree, and they usually move excessively. In order to improve this situation, some watches turn the fast and slow hands according to the number of fine-tuning screws, which has certain effect.
At present, some advanced watches, such as Omega watches, cancel the fast and slow hands, and at the same time change the moment of inertia of the balance parts by adjusting the four opposite screws on the rim of the balance wheel, that is, change the vibration period, which also achieves the purpose of adjusting the speed. Moreover, aft that fast and slow hands are cancel, the time accuracy of the watch can be improved. However, the range of adjustment speed is very small, less than 1 min. This requires the hairspring to have high machining accuracy. The speed of a mechanical pendulum depends on the length of the pendulum.
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The development process of old mechanical clocks and watches
The ancient Greeks in BC made a mechanical countdown timer consisting of 30 to 70 gear systems, which was used to time the Olympic Games. This instrument is called "Antichi Sheila Instrument" and consists of dozens of copper gears and multiple dials. ?
It is recorded in the East that Su Song in the Northern Song Dynasty (1 1 century) made a water transport instrument platform. During the Northern Song Dynasty, the water transport instrument was built in Kaifeng 1086 in the Northern Song Dynasty. The water transport instrument was created by Su Song, an astronomer, astronomical machinery manufacturer and pharmacologist in the Northern Song Dynasty. It mainly uses dripping water to drive the mechanical clock to run. The escapement, the key component of later mechanical clocks, first appeared on it.
/kloc-in the third century, a German named Vic made a clock for the French emperor at that time, which lasted for eight years and was extremely beautiful. The earliest European mechanical clock introduced to China was dedicated to the Wanli Emperor of the Ming Dynasty. After receiving this gift, Emperor Wanli praised it, looking at it almost every day and caressing it every night. So he immediately issued a summons to set up a palace workshop specializing in making mechanical clocks for him and his relatives and confidant ministers.
The coronagraph made in Germany can show the position of the sun and the length of day and night at the same time. /kloc-in the 5th century in Nuremberg, Peter Haehnlein made the world's first portable timer and invented the clockwork.
In order to know the time more timely, the mechanical clock is equipped with a clock face and hands. Time, an invisible standard that always accompanies the development and progress of human society, has been described visually for the first time. Soon after, a mechanical clock that can automatically tell the time appeared. The appearance of 1335 public clock made mechanical clock enter people's daily life for the first time. Due to the complex structure, the driving system is very heavy and the mechanical clock is quite huge, so it is impossible to enter the home.
The method of adjusting the speed of mechanical clocks by the General Administration of Quality Supervision, Inspection and Quarantine