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The Encyclopedia of Horology

Component record · Escapement

Double Roller

Partially verified

Two-disc assembly

What it does

Separates impulse and safety functions

How it works

Evolution

Standard for lever escapements

Known variations

    Identification for collectors

      Common failure modes

      • Cracked roller

      Diagram

      balance wheel with timing screwsflat or overcoil hairspringregulator index
      Schematic: balance, hairspring and regulator. An outline schematic drawn to show the arrangement of the parts discussed here. It is not a dimensioned working drawing and does not depict a particular maker's calibre.

      Sources & references

      1. de Carle, D., Practical Watch Repairing
      2. de Carle, D., Watch and Clock Encyclopedia
      3. Daniels, G., Watchmaking

      Where sources disagree, the disagreement is stated rather than resolved silently.