Ram position detection method, ram drive method, ram drive...

Details Ram position detection method, ram drive method, ram drive... Ram position detection method, ram drive method, ram drive...

2011-03-29

2011-03-29

Nguyen, Jimmy T (Department: 3725)

Presses

Methods

C100S049000, C100S271000, C100S269140, C100S269180

Reexamination Certificate

active

07913616

ABSTRACT:
A ram driving method including the steps of fixing one end of a large-diameter piston rod integral with a large-diameter piston reciprocably included in a large-diameter cylinder attached integrally to a ram to a fixing unit, connecting one end of a small-diameter piston rod integral with a small-diameter piston reciprocably included in a small-diameter cylinder integral with the large-diameter cylinder to a moving member moved by a motor driving, integrally moving the small-diameter cylinder and the small-diameter piston and communicating a first compartment and a second compartment of the large-diameter cylinder divided by the large-diameter piston with each other, moving the ram integrally with the small-diameter piston rod moved by the moving member, and communicating the small-diameter cylinder with the large-diameter cylinder, thereby moving the large-diameter cylinder with a strong force by a working fluid supplied from the small-diameter cylinder.

REFERENCES:
patent: 5735201 (1998-04-01), Hirao et al.
patent: 6941783 (2005-09-01), Yamanaka et al.
patent: 2005/0126358 (2005-06-01), Yamamoto
patent: 2007/0150083 (2007-06-01), Kanazawa et al.
patent: 10-141313 (1998-05-01), None
patent: 11-291097 (1999-10-01), None
patent: 2002-295624 (2002-10-01), None
English Language Abstract of JP 2002-295624.
English Language Abstract of JP 10-141313.
English Language Abstract of JP 11-291097.

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