Device and method for controlling stop of hydraulic press...

Details Device and method for controlling stop of hydraulic press... Device and method for controlling stop of hydraulic press...

2005-07-26

2005-07-26

Ostrager, Allen (Department: 3725)

Presses

Methods

C100S048000, C100S099000, C100S269120, C100S269140, C100S269180, C060S413000, C072S453010, C083S639100

Reexamination Certificate

active

06920821

ABSTRACT:
A rod pressure holding instruction section controls a servo motor to rotate a two-way pump in a counter direction, and to supply hydraulic oil, with pressure which does not exceed pressure from a weight of a ram, to a two-way pump-side piping, increasing pressure. A difference between pressure in a rod-side cylinder chamber-side piping of a speed switching valve and pressure in a two-way pump-side piping of the speed switching valve is decreased, thereby decreasing an impact generated when switching the speed switching valve and stopping the ram at a predetermined position.

REFERENCES:
patent: 2545246 (1951-03-01), Tucker et al.
patent: 5568766 (1996-10-01), Otremba et al.
patent: 6240758 (2001-06-01), Nagakura
patent: 2503143 (1976-07-01), None
patent: 2016980 (1979-09-01), None
patent: 6-9799 (1994-02-01), None
patent: 10193200 (1998-07-01), None
patent: 2001-121299 (2001-05-01), None
English Language Abstract of JP 2001-121299.

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