Patent ID: 8591101

Claim:
An escapement governor comprising: an escape wheel; a balance with hairspring including a roller having a passing hollow, and an impulse pin provided on the roller; and a pallet fork (complete) transmitting the power of the escape wheel to the impulse pin to thereby cause the roller to make normal rotation or reverse rotation, wherein the pallet fork (complete) comprises: a pair of entry horn and exit horn extending from a rotation axis of the pallet fork (complete) toward a rotation axis of the balance with hairspring and adapted to transmit the power of the escape wheel to the impulse pin; and a safety pin which is provided between the pair of entry horn and exit horn, which extends from the rotation axis of the pallet fork (complete) toward the rotation axis of the balance with hairspring, which is formed to be shorter than the pair of entry horn and exit horn, which enters the passing hollow to thereby cause the pallet fork (complete) to make normal rotation or reverse rotation with respect to the rotation axis of the pallet fork (complete), and which abuts a portion of the roller other than the passing hollow to thereby prevent erroneous rotation of the pallet fork (complete); and the roller is formed in a single layer.