The dosing mechanism (104) of the delivering of the medicament of the scheduled minimum dose of small Yu in a kind of anti-locking system has clutch ring (130 by providing 200) fixed rotationally relative to shell (120), it is selected when dosage is less than Minimum Permissible Dose. The dosing mechanism also enumerates the shell (120) and dose dial component (122 of medicine delivery device 202) it is located at the shell and can be in dosage setting step. Drive sleeve (124 206) in dose dial component, main shaft (126) is located at casing, and clutch (128 212) it is located at dose dial component and drive sleeve. When the dose dial component is rotated to select the dosage less than minimum dose, clutch ring (130 200) prevent the drive sleeve from rotating, so that selected dosage be prevented to be administered.
