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Once the watch's balance wheel and escapement fork removed, and then winding the transmission train no obstacles, will produce high-speed rotation, this is called " running string ." Because the wheel is the driving wheel, the wheel shaft driven, so a few gear superposition down to the last level of the escape wheel, running speed is very high, especially in the winding near full strings, but also issued a " Creak "sound, a long time to do high-speed running string can also cause rapid wear and tear on the gear shaft tenon.
Running string is also divided into two situations:
Pure movement state
The movement has been fitted to the needle and assembled into the case .
The second state is more important, because many watches are only in the case, close the back cover only when the problem occurs, the typical reason is that the movement of the table hole on the case handle head tube is not the same heart, but also the machine The core is under some pressure, causing the splint to be compressed and the part gap to be lost.
Running in the watch assembly and repair, the main purpose is to check whether the axle into the shaft eye is reliable, the gear alignment and meshing state, the eye shaft lubrication, gear beating, gear axial radial clearance, wheel and axle Sharp concentricity, the sensitivity of the gear train, etc., which can be observed in a short period of time by running strings. Pay particular attention to discovering whether there is a periodic blockage of the train wheels, a change in speed, a sudden and sudden rotation, or even a Caton phenomenon, to determine the position at which the problem may occur according to the gear ratio of the gears or their respective rotation cycles Where, this is the purpose of doing running.
Dial gear surface assembly, but also includes calendar, calendar and other additional instructions related to the gear, they are relatively slow speed, by running the same can be faster to check its working status is reliable. Running string should be carried out under the weak moment of the spring, and all the added oil must be finished betting.
In addition, the assembly problems can also be run through the strings to check, in particular, the gap between the needles, hands and dials on the dial or other signs of clearance, the second hand and table glass gap.