Patent attributes
A dust prevention mechanism of a spindle device that ensures prevention of cutting liquid etc. from entering an inner portion of the spindle device, which saves energy and reduces noise upon stop of rotation of a spindle is provided. In a dust prevention mechanism 1, a spindle device 2 starts operating upon a command from a controller 4. Then, a 2-port solenoid valve 7 is opened to supply a predetermined amount of compressed air into the inner portion of the spindle device 2. In contrast, the spindle stops rotating upon a command from the controller 4. The controller 4 closes the 2-port solenoid valve 7, while it opens a 2-port solenoid valve 10 in a bypass route B. The controller 4 supplies compressed air, whose amount is reduced by a diaphragm 9, into the inner portion of the spindle device 2 during a predetermined time set by a timer 8.
