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Question Box

From Horology magazine, November, 1937

Question Box

Hairsprings Catch

Editor HOROLOGY, 
Dear Sir:

Please be kind enough to tell me the reason why we are having so much trouble on the hairsprings of a ladies' wrist watch.

Many times the hairspring is caught on the regulator pins, and sometimes the hairspring is caught on the end of the balance bridge, and also on the end of the regulator.

Thanking you for your kindness, I am a subscriber 
E. E. G.

Answer: Hairsprings usually become caught because the watch has been given a violent jar, looping the outer coil or coils over the regulator or bridge. When a spring catches this way there is little that the horologist can do to prevent it.

The diameter of the spring and general design of the regulator and bridge are contributing factors in making it possible for the spring to get caught.

In other cases a coil of the spring may catch on the burred end of a regulator 

pin, or if the pins are slightly too long an extra coil may jump in between them.



These minor faults can easily be corrected. The regulator pins must have no appreciable excess extending below the portion of the spring which they straddle and the ends of the pins should be free from any sort of burr.

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