Plastic article or earthenware shaping or treating: apparatus – Control means responsive to or actuated by means sensing or... – Mold motion or position control
Patent
1980-09-15
1981-12-08
Flint, Jr., J. Howard
Plastic article or earthenware shaping or treating: apparatus
Control means responsive to or actuated by means sensing or...
Mold motion or position control
4254512, 425595, 425590, B29F 100
Patent
active
043045405
ABSTRACT:
A hydraulic press includes long stroke piston cylinder assemblies to drive a movable platen along four pull down power rods between an upper open position and a lower reference position immediately adjacent to and parallel with the stationary platen, a wedge ring clamp mechanism selectively to lock the movable platen to the four pull down power rods at either the upper or lower reference positions, and short stroke piston cylinder assemblies operative reciprocally axially to drive the four pull down power rods when the upper platen is locked thereon to move said locked upper platen between said reference position and a closed position in which the two platens are loaded under high forming pressure. The short stroke piston cylinder assemblies are controlled for simultaneous but also independently adjustable movements to maintain parallelism between the upper and lower platens and also to maintain force and velocity control over the upper platen during the short stroke movement of the upper platen between the reference position and the closed forming position. The movable platen is centered and guided in its movements by adjustable wedge guide mechanisms on the movable platen cooperating with wear plates on the press frame.
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