ZIEHAPPARAT IN EINER PRESSE.

摘要

A press drawing unit has a pressure check, which can be raised and lowered by an elastically acting pressure medium-operated drawing cylinder for counter-holding during drawing and for ejection of the drawn sheet part, and at least one blocking device for delayed following of the press ram upstroke by the pressure check, the blocking device consisting of a pressure cylinder and a piston with a working face which is acted on by hydraulic fluid in a direction opposite the counter-holding direction during drawing. The novelty is that the pressure piston is slidably mounted on the piston rod linked to the pressure check, the piston rod has an abutment on its part which projects from the side opposite the pressure piston working face and the side of the pressure piston opposite the working face is continuously pressurised, so that the pressure piston is retracted from the abutment when the working face is not pressurised and is seated on the abutment when the working face is pressurised by the hydraulic fluid.