Lever escapement assembly for a timepiece movement

Lever type escapement including an assembly associated with an escape wheel, said assembly including pallets, a roller and a pin fastened to said roller, intended, in a service position, to cooperate with one another and with said escape wheel whilst being safe against knocking,

• said pallets having no guard pin and including, on the one hand, an entry pallet and an exit pallet, intended to cooperate alternately with said escape wheel and, on the other hand, a pallet fork intended to cooperate with said pin and said roller and including first and second horns delimiting a pallet fork entry, said roller being at least partly situated at the same level as said pin, in the direction of the thickness of said roller, said roller having an anti-overbanking wall of cylindrical general shape in which a notch is formed, in a region adjacent to said pin,
• said pallets, said roller and said pin being conformed and dimensioned in such a manner that, in said service position, said anti-overbanking wall is able to define an abutment for said first and second horns,
• said pallets, said roller and said pin being moreover conformed and dimensioned in such a manner that, in said service position, each of said first and second horns is able to penetrate to the interior of said notch exclusively when said pin is at least partly situated in said pallet fork entry.

Timepiece movement including a lever type escapement including an assembly associated with an escape wheel, said assembly including pallets, a roller and a pin fastened to said roller, intended, in a service position, to cooperate with one another and with said escape wheel whilst being safe against knocking,

• said pallets having no guard pin and including, on the one hand, an entry pallet and an exit pallet, intended to cooperate alternately with said escape wheel and, on the other hand, a pallet fork intended to cooperate with said pin and said roller and including first and second horns delimiting a pallet fork entry, said roller being at least partly situated at the same level as said pin, in the direction of the thickness of said roller, said roller having an anti-overbanking wall of cylindrical general shape in which a notch is formed, in a region adjacent to said pin,
• said pallets, said roller and said pin being conformed and dimensioned in such a manner that, in said service position, said anti-overbanking wall is able to define an abutment for said first and second horns,
• said pallets, said roller and said pin being moreover conformed and dimensioned in such a manner that, in said service position, each of said first and second horns is able to penetrate to the interior of said notch exclusively when said pin is at least partly situated in said pallet fork entry.