1. Mechanism of increase / decrease of a dose for automatic injection device on the basis of the torsion spring intended for multiple injections and with adjustable controlled variable doses of liquid medicament, comprising a torsion spring, which is twisted during the dose setting rotation the dose setting assembly relative to the housing in a first direction and unwinds by rotating assembly of the dose in a second direction opposite the first direction, wherein the mechanism for increasing / decreasing the dose comprising: at least one ratchet portion (21) adapted to monitor the rotation assembly of the dose in the first direction during dose setting, timing element (10) holding the at least one ratchet portion (21) against displacement under the action of the torsion spring and the pairing of at least one of the ratchet portion (21) with teeth (12) of a gear member (10) prevents unwinding of the torsion spring, and the rotation assembly of the dose in the first direction provides movement of the ratchet portion (21) of one tooth (12) to the next tooth (12) of a gear member (10), wherein the rotation assembly of the dose in the second direction corresponding to reduce the set dose, provided the activation of at least one of the ratchet portion (21) from its retracted from the teeth (12) of a gear member (10), making it possible to move, under the action of the torsion spring, the ratchet segment (21) in the second direction to the previous tooth (12), so that the force accumulated in the torsion spring is reduced stepwise, characterized in that n is less1. Механизм увеличения/уменьшения дозы для автоматического инъекционного устройства на основе торсионной пружины, предназначенного для многократных инъекций с устанавливаемой и регулируемой величиной дозы жидкого лекарственного препарата, содержащий торсионную пружину, которая закручивается в процессе установки дозы вращением узла установки дозы относительно корпуса в первом направлении и раскручивается при поворот
