Determine whether the earthquake watch, simply open the form the back, put plywood on the pendulum to observe the drilling device care situation, that is able to identify. If you put plywood mounted on the outside of the pendulum is reed drill care (shock spring) Jia Zhu, is the shock watch. If the swing of the pendulum mounted on plywood prop installed a round piece drill outside, relying on two small screws placed around the wafer tight plywood above, it is not shock watch.
This drawing illustrates the principle of an anti-shock mechanism. The endstone, a, is subject to the action of a spring, b. If an axial shock occurs, the endstone can lift slightly until the shoulder, c, strikes a fixed part of the setting. To damp lateral shocks, the jewel hole is fitted in a setting comprising an inclined plane, d, which provides for a slight lateral shift limited by the collet-arbor or by the roller-arbor, e, which strikes a fixed part of the frame.
Earthquake watch some imported case or dial on the back cover is usually marked with lNCABLOC or SHOCKPROOF or DIASHOCK or PARASHOCK or ANTI ~ SHOCK and so forth. China-made tables are normally marked with "shock" words.
Earthquake watch is not absolute shock, the shock prop up the bowl and put the location there is a limit move drill, and put the shaft journal is very thin (about 0.085 ~ 0% 005 mm), if subjected to severe vibration, still broken. In addition, severe vibration, the springs will cause disorder, caused by other mechanical damage. Therefore, the watch also need to avoid severe earthquake shock.
Article Source: http://www.watchreviewcenter.com
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