Glossary

A crucial component that prevents the escapement from unlocking accidentally when the watch experiences sudden shocks or forces while the impulse jewel is disengaged from the pallet fork. It acts as a protective mechanism, ensuring that the escapement remains locked even during unexpected impacts, thereby preserving the watch's accuracy and reliability. By preventing premature unlocking, the safety roller contributes to the stable and precise movement of the watch's hands, maintaining its overall timekeeping performance.

pocketwatchdatabase.com/reference/single-roller-vs-double-roller