Patent ID: 8684239
Filing Date: 2014-04-01
Classification: B05B,B05C,G01F,H01L

Abstract:
1. An apparatus for pulsed dispensing of liquid, comprising: a syringe dispenser including a syringe body structure communicating with an input passage having a cross sectional area for receiving pressurized actuation air, and communicating with an exit passage for allowing discharge of the liquid, the actuation air being used to force an amount of the liquid through the exit passage; a piston mounted for movement within said syringe body structure and defining a liquid space on one side of said piston communicating with the exit passage, and an air space on another side of said piston communicating with the input passage; and an air input flow rate controller operative to increase the flow rate of the actuation air through the input passage in accordance with a relationship that depends at least partially on a reduction of liquid volume in the syringe body structure resulting from a previous pulsed dispensing operation, wherein said air input flow rate controller further comprises an elongate member extending from said piston through the input passage, said elongate member reducing in diameter in a direction away from the exit passage such that movement of said elongate member is operative to modify the cross sectional area of the input passage.