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The wheel is said to be locked on the exit pallet.
This turns the pallets about their axis, which places the exit pallet into the path of the rotating escape wheel.
The escape wheel has specially shaped teeth of either ratchet or club form, which interact with the two jewels called the entrance and exit pallets.
The most obvious way that this will show itself is that the pallet arm will have some recoil on either the entry or exit pallet.
A new design for a jewelled rotary bush with end stops on the pallet arbor enabling accurate adjustment of the entry and exit pallet drops.
The pallet which the teeth first contact is called the entry pallet, while the other one is called the exit pallet.
As the escape wheel rotates clockwise, the entry pallet is the first to meet an escape wheel tooth, and the exit pallet is the last.
The lever moves until it rests against the right banking pin; it is held in this position by the force of the exit tooth against the exit pallet jewel (called the draw).
Once the entrance tooth leaves the impulse plane of the entrance pallet, the wheel is able to turn a small amount (called the drop) until the exit tooth of the escape wheel lands on the locking face of the exit pallet.
This will unlock the escapement, releasing the escape wheel so that the exit tooth can slide over the impulse plane of the exit pallet, which transfers a clockwise impulse to the balance wheel's impulse pin via the lever fork, while pushing the lever up against the left banking pin.
