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The Encyclopedia of Horology

Component record · Escapement

Single Roller

Partially verified

Disc on balance staff

What it does

Carries the impulse pin

How it works

Evolution

Replaced by double rollers in better watches

Known variations

    Identification for collectors

      Common failure modes

      • Loose pin

      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.