Pump for supplying an application system of a liquid covering product

A pump for supplying an application system of a liquid covering product, comprising a motor actuating at least two pistons, wherein it comprises a drum rotated by the motor, the drum comprising an outer cylindrical surface having a cam profile, wherein each of the pistons is secured to a rod on which a roller is fastened rolling over the cam profile such that the roller connected to each of the pistons via one of the rods is translated along the translation axis of the corresponding piston under the action of the rotation of the drum, and wherein each of the rollers is in contact with the cam profile in an angularly offset position relative to the position of the other rollers such that one of the pistons is moving when the other piston reaches an inversion point of the movement direction, and wherein it comprises compensating means suitable for accelerating one of the pistons when another piston reaches an inversion point of its movement direction.