Ball screw lubricative sealing device

A ball screw lubricative sealing device comprising:

• generally cylindrical case members having attachment parts to be attached to both ends of a screw nut, respectively;
• a plurality of thin seal plates having a hole each and fitted inside each of the case members, the thin seal plates being displaced in respective circumferential directions and stacked together, and
• a plastic wiper in a discoid shape, having a hole, and fitted with a space from the thin seal plates inside each of the case members to which the thin seal plates are fitted, wherein
• the hole of each of the thin seal plates and the hole of the plastic wiper each has a shape corresponding to a lateral cross-sectional shape of a screw groove of a ball screw shaft,
• the case members are each provided with a groove for fitting the thin seal plates, an annular projection for forming the space, and a groove for fitting the plastic wiper,
• outer circumferential surfaces of the thin seal plates are bonded to an inner circumferential surface of the groove using an adhesive;
• and
• the plurality of thin seal plates are impregnated with a lubricant and comprise resilient rubber material penetrated into surfaces of thin polyester plastic fibers.