A water-removal press for textiles, comprising:
- a machine framework;
- a press base which includes a plurality of discharge openings;
- a circular-cylindrical filling frame, said filling frame being open at both end faces displaceably guidable on perpendicularly aligned guides, and capable of being lowered onto said press base and vertically positioned by means of a lifting device;
- a press piston comprising a circular, rigid piston body having a free end face, a pot-shaped elastic body fixed to said piston body along an edge area, and an intermediate space between said piston body and said elastic body for receiving a fluid, said piston being displaceably guided in alignment with said filling frame by means of a perpendicularly aligned guide, and vertically positionable by means of a lifting device, wherein said elastic body comprises a pot-shaped diaphragm which includes a base part, a circular-cylindrical collar part which adjoins said base part without transition, said base part being flat in the stress-free condition and being adapted to face said free end face of said piston body, and an inwardly directed fastening bead integrally formed on an open edge of said collar part, a lower edge of said fastening bead being adapted to sit on a seating surface of said piston body;
- a clamping ring arranged on the side of said fastening bead facing away from said base part, said ring including a seating surface contacting said fastening bead, said clamping ring being connected to said piston body in the axial direction;
- a filling and emptying means which includes a delivery pump and a pressure pump, for filling and emptying said intermediate space;
- means for drawing said collar part of said diaphragm radially inwardly against said piston body so that said collar part has an outside diameter smaller than the clearance width of said filling frame, wherein:
- said piston body is dimensioned such that the outside diameter of its peripheral, radially outwardly facing surface increases from a point nearest said base of said diaphragm toward said seating surface and such that said outside diameter of said piston body is less than the outside diameter of said collar part,
- said piston body is further dimensioned such that the axial length between said seating surface and said point nearest said base of said diaphragm is less than the axial length between said fastening bead of said diaphragm and said base, and,
- said free end face of said piston body is dimensioned such that it is concave relative to said base of said diaphragm, whereby, when said filling and emptying means is operated to empty said intermediate space, said collar part of said diaphragm is drawn radially inwardly against said piston body so that the clearance between said collar part and said filling frame is increased and the risk that textiles will become jammed between said filling frame and said collar part is reduced.