PIEZO ACTIVATED PUMP IN AN INK LIQUID SUPPLY SYSTEM

摘要

A piezo-activated liquid supply pump system for an ink jet printer includes a cylindrically shaped vibratory pipe comprising a piezo-electric element, and a coneshaped pressure chamber having a resilient wall and disposed in the cylinder shaped vibration pipe with a cavity therebetween containing polyethylene glycol for transferring vibration of the piezo-electric element to the resilient wall. The volume of the pressure chamber varies in response to the vibration of the piezo-electric element to pump liquid. The conical configuration of the pressure chamber ensures effective removal of air bubbles from the pressure chamber. The cavity communicates with a buffer chamber so as to introduce the polyethylene glycol into the buffer chamber when the liquid contained in the pressure chamber freezes, whereby the expansion of the pressure chamber caused by the freezing of the liquid is absorbed.