Plastic article or earthenware shaping or treating: apparatus – Control means responsive to or actuated by means sensing or... – Molding pressure control means responsive to pressure at...
Patent
1992-10-07
1994-08-09
Bushey, Charles S.
Plastic article or earthenware shaping or treating: apparatus
Control means responsive to or actuated by means sensing or...
Molding pressure control means responsive to pressure at...
264 405, 425150, B29C 4580
Patent
active
053360745
ABSTRACT:
A hydraulic press includes a fixed mold, a movable mold movable closely to or separately from the fixed mold, a hydraulic cylinder for moving and pressing the movable mold, and a hydraulic circuit for controlling the supply of a pressing oil in the hydraulic cylinder. The hydraulic circuit includes: a variable capacity pump connected to the hydraulic cylinder by an oil tube through a solenoid direction switching valve; a solenoid proportional flow control valve interposed on the way of an oil tube bypassing the solenoid direction switching valve; a detecting sensor for detecting the position or speed of the movable mold; a speed setter for setting the pressing speed of the movable mold; and a controller for comparing the output value of the detecting sensor with a speed set-up value thereby adjusting the opening of the solenoid proportional flow control valve. With this construction, it is possible to smoothly control the pressing speed in a low speed pressing region of the movable mold irrespective of the leaked oil amount and load on the pressing cylinder side.
REFERENCES:
patent: 3752363 (1973-08-01), Fegley et al.
patent: 4563147 (1986-01-01), Langecker
patent: 4889478 (1989-12-01), Sato
patent: 5071603 (1991-12-01), Kurumaji et al.
Ingenieur Digest, issue 3, vol. 10, Mar. 1971, p. 73, picture 37.
wt-Z. ind. Fertig., vol. 71, No. 2, 1981, p. 114.
Magazine Fluid, "Dauerlauf Mit Prop-Technik", Sep. 1988, pp. 37-39.
o+p "olhydraulik und pneumatik", vol. 30, No. 6, 1986.
o+p "olhydraulik und pneumatik", vol. 29, No. 10, 1985, p. 742.
Kashiwa Masahiko
Kurumaji Masanobu
Bushey Charles S.
Kabushiki Kaisha Kobe Seiko Sho
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