Spindle assembly for use in a lens polisher

摘要

A lens polisher intended to polish a glass lens is provided with a spindle assembly having a spindle body, a housing secured to the spindle body, a load cell for monitoring the pressure applied to the lens, and a rotary head rotatably mounted on the housing. The spindle assembly further has an electric magnet secured to the load cell, at least one plate spring resiliently carried by the rotary head, a permanent magnet secured to the plate spring so as to be opposed to and spaced from the electric magnet, and an abrasive tool secured to the plate spring to polish the lens. A control unit is electrically coupled with the electric magnet and the load cell to control the voltage applied to the electric magnet in response to a signal sent from the load cell. The magnetic force generated by the electric magnet and that generated by the permanent magnet respulse to each other so that the abrasive tool may be resiliently biased against the lens during polishing while the pressure applied to the lens is being monitored by the load cell and is being controlled by the control unit.