FLUID DISPENSER UTILIZING DUAL COILS AND METHODS OF FLUID DISPENSING

摘要

A dispenser body having a liquid inlet (28), a discharge outlet (32), and a flow channel (34) capable of directing a flow of the hot melt adhesive from the liquid inlet (28) to the discharge outlet (32). The flow channel (34) includes a valve seat (36) between the liquid inlet (28) and the discharge outlet (32). The dispensing module (10) further includes a needle (38) having a valve member (40) mounted for movement in the dispenser body between an open position in which the valve member (40) is disengaged with the valve seat (36) allowing liquid flow from the discharge outlet (32) and a closed position in which the valve member (40) is engaged with the valve seat (36) preventing liquid flow from the discharge outlet (32). A first electromagnetic coil (68) is activated to move the needle (38) to the open position and a second electromagnetic coil (70) is activated to move the needle (38) to the closed position.