GB907353A - Improvements in or relating to mechanical presses - Google Patents

Abstract

907,353. Momentum power-storing apparatus. WALCHHUTTER, M. U. Jan. 27, 1959 [Jan. 29, 1958], No. 2927/59. Class 10. A mechanical friction press having a fixed cross-piece and bridge 1, 2 and a vertically reciprocable head 25 coupled to a flywheel 8 through a worm-screw 9 comprises a liquidfilled receptacle 10 having a gas cushion 10<SP>1</SP> for storing the kinetic energy of the hand and flywheel as potential energy during a part of the idling, i.e. upward, stroke of the head, and a cylinder and piston arrangement 5, 6, 7 for transmitting the stored energy as kinetic energy to the head and flywheel during part of the working, i.e. downward, stroke of the head and in which press the storage and transmission means are controlled electrically and automatically by the position of the head along its stroke. The flywheel 8 is friction driven by a motordriven disc 18 moved into and out of engagement with the wheel by the actuation of an electromagnet 24. The press is started with the head in the lowermost position and the flywheel is driven by the disc. The head 25 initially moves upwardly only against the force of gravity, liquid being pumped from the cylinder 5 by the upwardly moving piston 6 into an open vessel 12 having an electrically-controlled input valve 14. As the head nears the top of its stroke it closes a switch 27, thus closing the valve 14 and causing the liquid from the cylinder to pass to the receptacle 10 to compress the cushion 10<SP>1</SP>. The disc 18 is then automatically withdrawn from the wheel 8, the cushion 10<SP>1</SP> expanding to force the head downwardly. The energy stored in the cushion is converted into kinetic energy and the valve 14 is opened to allow liquid to pass from the vessel 12 to the cylinder 5. At the bottom of this working stroke the head effects re-energization of the magnet 24 to cause the flywheel to be driven. As the head rises once again, this drive is again disconnected, the head moving upwardly against gravity and the cushion 10<SP>1</SP>. When this movement is stopped the expanding cushion and gravity move the head down again to make a second working stroke. On again reaching lowermost position, the head has completed a working cycle which is automatically repeated until the press is shut down. In a modified press the piston 6 is caused to act against a mechanical resilient cushion such as a spring.