To provide a screw feeder for preventing the scattering of lubricant leaking from between a screw shaft and a labyrinth seal member.
The screw feeder comprises the labyrinth seal member 9 provided in a labyrinth seal storage recessed portion 8 formed in the end face of a nut 3, a contact seal portion forming member 10 for forming a contact seal portion on the outer periphery of the screw shaft 1 located on the end face side of the nut 3 beyond the labyrinth seal member 9, and a lubricant sucking device 14 for sucking lubricant leaking into a lubricant collecting space 11 formed between the contact seal portion forming member 10 and the labyrinth seal member 9 through a lubricant collecting hole 12 formed in the nut 3. Herein, a groove 15 such as a grinding recess is provided in the groove bottom of a spiral groove 2 formed in the outer peripheral face of the screw shaft 1 and a lubricant scraping member 20 having a protruded portion 21 at the front end in slide contact with the groove 15 is provided in the lubricant collecting space 11.
Yoshiaki Naito
Cui Shu Tetsu