US Patent 7226256 Machine tool having inbuilt water supplier

A machine tool includes a base having a spindle rotatably attached to a support for supporting a tool member, and a fluid supplying device for supplying fluid into the spindle, for cooling purposes. The fluid supplying device includes a housing secured to the support for rotatably receiving the spindle, a casing is secured to the housing and has a channel for communicating with the conduit of the housing, and a membrane is secured between the housing and the casing and disposed between the bore of the housing and a space of the casing for pumping the fluid from the space to the channel of the casing. A check valve is disposed in the casing and has a spring member for biasing a ball to selectively block or open a passage of the casing.