Consultation content: What is the problem that the second hand moves with the minute hand when adjusting the watch, and what is the solution if the strap is too hard?

JD。 COM reply: Hello! Quartz watches push the second hand through stepping motors. There must be a certain gap between the gears inside the watch movement, otherwise the hands cannot move. The minute hand and the hour hand belong to "dead engagement", and the positions of the minute hand wheel, the straddle wheel and the hour hand wheel are relatively fixed, and generally there will be no dislocation or movement. The situation of the second wheel is different from that of the minute wheel, because the minute wheel will "slip" and it will appear as long as you dial the needle. Therefore, it is difficult to stabilize the fixed interval of the second hand. In order to ensure the normal meshing and smooth transmission between gears, the clock movement basically adopts modified cycloidal tooth profile, and the gear teeth have meshing angle and meshing angle, and there must also be backlash, otherwise there will be tooth jacking or tooth scraping. The backlash of a pair of gears is very small, but it becomes several pairs of gears, and the backlash is superimposed together, which becomes obvious. The second hand of quartz watches basically jumps seconds, and the accuracy of the second hand seems to be more obvious, especially for quartz clocks with large market. It is normal that the second hand is aligned with the scale in one part of the dial, but it is not aligned in the other part. In fact, when the second hand of a mechanical watch goes, it is also intermittent and has a pause. It depends on the vibration frequency of the balance wheel. If it is 2 1600 times/hour, the second hand will "tremble" 6 times per second. The position of the second hand is the highest, far away from the dial, which is easy to cause visual error due to the observation angle. Thank you for your support to JD.COM!