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A middle liner of a slide guide device for a machine press has a spherical shaped side which fits into a sliding gib attached to a slide. The middle liner slides along a fixed gib at first and second linear surfaces that are at an angle with each other. The combination of self-alignment and smooth m

A middle liner of a slide guide device for a machine press has a spherical shaped side which fits into a sliding gib attached to a slide. The middle liner slides along a fixed gib at first and second linear surfaces that are at an angle with each other. The combination of self-alignment and smooth movement of the slide is achieved in the presence of an eccentric load acting on the slide. A machine press equipped with such a slide guide device has excellent eccentric load resistance and high working precision. In a further embodiment, a press machine is further equipped with a knockout device having knockout block moving between a pair of guide rails. A plurality of middle liners, each having at least one spherical surface, are positioned between the knockout block and the guide rails. The resulting knockout device provides a stable knockout load with low noise and low energy consumption.

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A middle liner of a slide guide device for a machine press has a spherical shaped side which fits into a sliding gib attached to a slide. The middle liner slides along a fixed gib at first and second linear surfaces that are at an angle with each other. The combination of self-alignment and smooth m

A middle liner of a slide guide device for a machine press has a spherical shaped side which fits into a sliding gib attached to a slide. The middle liner slides along a fixed gib at first and second linear surfaces that are at an angle with each other. The combination of self-alignment and smooth movement of the slide is achieved in the presence of an eccentric load acting on the slide. A machine press equipped with such a slide guide device has excellent eccentric load resistance and high working precision. In a further embodiment, a press machine is further equipped with a knockout device having knockout block moving between a pair of guide rails. A plurality of middle liners, each having at least one spherical surface, are positioned between the knockout block and the guide rails. The resulting knockout device provides a stable knockout load with low noise and low energy consumption. tudinal bore extending in said substantially cylindrical body. 7. The pressure control mechanism according to claim 6, wherein said gripping jaws further comprise: a plurality of gripping formations along said concave gripping surface. 8. The pressure control mechanism according to claim 7, wherein said gripping formations comprise: one of a plurality of teeth and screw threads. 9. The pressure control mechanism according to claim 1, wherein said rotatable disc is rotatably supported within a retaining ring, the retaining ring being coupled to a rear support surface of said substantially cylindrical body, said rear support surface being longitudinally spaced from said front support surface thereof. 10. The pressure control mechanism according to claim 9, wherein said moving means further comprises: link means interconnecting said retaining ring and said rotatable disc, wherein said link means are extensible and retractable to effect a rotation of said rotatable disc. 11. A molding apparatus comprising: a first and a second relatively movable platen each carrying a respective half of a mold; a plurality of tie rods extending between and through the first and second platens for guiding a relative movement of said platens; controllable displacement means operatively coupled to said platens for causing said relative movement of said first and second platens to thereby open and close said mold halves; a pressure control mechanism operatively coupled to said platens for applying a pressure to said platens to thereby maintain said platens in a closed position, the pressure control mechanism comprising a respective piston and cylinder-unit associated with each of said tie rods, the piston of each of said units having a longitudinal bore formed therein through which the associated tie rod extends, the piston of each of said units having a gripping mechanism operatively coupled thereto and structured and arranged to selectively grip the associated tie rod, wherein each of said gripping mechanisms is structured and arranged for reciprocating movement within with its associated piston, and wherein each of said gripping mechanisms includes a pair of gripping jaws transversely movable with respect to the associated tie rod and to selectively grip the tie rod; moving means structured and arranged to cause relative movement of said gripping jaws towards one another to thereby grip said tie rod, wherein said moving means comprises a rotatable disc operatively coupled to said gripping jaws; and movement translation means structured and arranged to translate a rotation of said disc into a transverse movement of said gripping jaws wherein said movement translation means comprise slots in one of said gripping jaws and said rotatable disc and corresponding projections carried by the other of said rotatable disc and said gripping jaws, such that upon rotation of said rotatable disc each projection is moved along its corresponding slot to thereby cause transverse sliding movement of said gripping jaws, each of said slots having a first portion and a second portion contiguous with said first portion wherein said second portion is arranged at an angle relative to said first portion. 12. The molding apparatus according to claim 11, wherein, in each of said gripping mechanisms, said gripping jaws are mounted in recesses therein for transverse sliding movement with respect to the associated tie rod. 13. The molding apparatus according to claim 12, wherein each of said slots has an elongated cranked shape. 14. The molding apparatus according to claim 12, wherein said projections are coupled to said rotatable disc, and each gripping jaw is provided with said slot in which a corresponding projection of said rotatable disc is slidably received. 15. The molding apparatus according to claim 12, wherein said projections are one of pins and rollers which extend generally in the longitudinal direction. 16. The molding apparatus according