FIELD: machine-tool industry. SUBSTANCE: chain includes blank unit, tool unit and sectional wheel unit; it is provided with hydraulic stepping motors used as power actuating members. Hydraulic motors are controlled from mechanical hydraulic pulse generator common for both hydraulic motors. Generator is made in form of code wheels provided with projections over periphery which close nozzles for creating of pressure pulses or leave them free. They are used for change-over of distributors with end distribution of working fluid fed to inlet on end distributor unit via working chambers of hydraulic stepping motors. One stepping hydraulic motor is connected with blank unit and other motors is connected with sectional wheel unit. EFFECT: higher efficiency. 1 dwg
