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Title:
HYDRAULIC COMPRESSOR AND CONTROL DEVICE THEREOF
Document Type and Number:
Japanese Patent JPS5581100
Kind Code:
A
Abstract:

PURPOSE: To increase the speed of piston movement under no-load state, by controlling the sending of pressure oil into cylinders according to the signal from a load detector provided on a piston rod which communicates the piston of small-diameter cylinder and the piston of large-diameter cylinder.

CONSTITUTION: Slightly opening a servo valve 9, pressure oil from an oil pressure source 8 is supplied into a cylinder 2 through a pressure oil pipe 10 to lower a piston 4 (set pressure switching valves 23, 24 are closed, switching valves 16, 17 are open, the oil in the lower chamber in the small-diameter cylinder 2 is sent back through pipe 11, oil is sucked into the upper chamber in the large-diameter cylinder 3 from pipe 14, and the oil is discharged from the lower chamber through pipe 15). Then, when a rod head 7 at the lower end of the piston rod 6 abuts against the work on the table and stops, it is detected by a load detector 25, of which output will fully open the servo valve 9, thereby operating the large-diameter cylinder 3 (set pressure switching valve 23 is opened, switching valve 16 is closed, oil is pumped into the upper chamber of large-diameter cylinder 3 through pipe 12, and oil is discharged from the lower chamber through pipe 15).


Inventors:
MITSUNARI KANAME
Application Number:
JP1978000153634
Publication Date:
June 18, 1980
Filing Date:
December 14, 1978
Export Citation:
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Assignee:
SAMU DENSHI KIKAI KK
International Classes:
B30B1/36; B29C33/00; B29C43/00; B29C43/02; B29C43/36; B29C43/58; B30B15/00; B30B15/18; B30B15/22; (IPC1-7): B30B1/36; B30B15/00; B30B15/18; B30B15/22



 
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