Claims:1. A system for volumetric deposition of a liquid, the system comprising:
a liquid dispensing unit (102) for dispensing the liquid on a substrate (104),
a stroke controlling unit (108) to actuate the liquid dispensing unit (102), the stroke controlling unit (108) comprising:
a pneumatic cylinder (202) with plurality of air inlets (206-1, 206-1) which initializes forward and reverse strokes of a solid piston (204) of the pneumatic cylinder (202); and
a thread bolt arrangement comprising a nut (212) and a threaded hollow piston (214), wherein the nut (212) is removably fixed at one end of the threaded hollow piston (214) to allow a movement of the solid piston (204) over the nut (212) and the threaded hollow piston (214), wherein the position of the nut (212) on the threaded hollow piston (214) is to fix a stroke length of the solid piston (204) to dispense a pre-determined volume of the liquid by the liquid dispensing unit (102); and
a stroke command unit (110) for actuating the stroke controlling unit (108), the stroke command unit (110) comprises:
a sensor (306) for detecting positioning of the substrate (104) at a pre-determined location; and
a controller (302) to control flow of fluid through the plurality of air inlets to activate movement of the solid piston (204) based on the detecting by the sensor (306).

2. The system as claimed in claim 1, further comprising a conveyer belt (106) for carrying the substrate (104) on which the liquid is to be disposed, wherein the substrate (104) is about 70 mm in length and 50 mm in breadth.

3. The system as claimed in claim 2, wherein the stroke command unit (110) is to synchronize a dozing speed of the liquid dispending unit (102) with a speed of the conveyer belt (106), wherein the dozing speed of the liquid dispensing unit (102) is indicative of a number of times of actuation of the liquid dispensing unit (102) per minute.

4. The system as claimed in claim 1, wherein the liquid dispensing unit (102) comprises:
a liquid tank (220) to hold the liquid to be dispensed;
a nozzle head (216) connected via a pipe (222) to the liquid tank (220), the nozzle head (216) being actuable by the stroke controlling unit (108), wherein the nozzle head (216) comprises:
a spring and ball arrangement (218) for pumping the liquid up from the liquid tank (220) via the pipe (222), wherein the spring and ball arrangement (218) is movable upon actuation by the solid piston (204) of the pneumatic cylinder (202), and wherein movement of the spring and ball arrangement (218) is based on the stroke length of the solid piston (204); and
a mist sprayer nozzle (224) provided on the nozzle head (216) for dispensing a fixed volume of liquid in the form of mist based on the movement of the spring and ball arrangement (218).

5. The system as claimed in claim 1, wherein the pre-determined volume of the liquid dispensed from the liquid dispensing unit (102) is from about 0.2ml to about 0.3ml.

6. The system as claimed in claim 4, wherein the mist sprayer nozzle (224) is of a diameter 10 micron for dispensing a mist formation of the liquid.

7. The system as claimed in claim 1, wherein the threaded hollow piston (214) of the stroke controlling unit (108) includes multiple threads wherein each of the multiple threads is of a pre-defined pitch corresponding to which the stroke length for the liquid dispensing unit is adjusted.

8. The system as claimed in claim 1, wherein the stroke command unit (108) comprises an electromagnetic relay for activating the solenoid value based on a signal received from the sensor.

9. A stroke controlling unit (108) for controlling dispensing of a liquid from a liquid dispenser (102), the stroke controlling unit comprising:
a pneumatic cylinder (202) with a first fluid inlet and a second fluid inlet for moving a solid piston (204) of the pneumatic cylinder (202) towards and against the liquid dispenser (102); and
a thread bolt arrangement comprising a nut and a threaded hollow piston (214), wherein the nut is removably fixed at one end of the threaded hollow piston (214) to allow a movement of the solid piston (204) along the nut and the threaded hollow piston (214), wherein the position of the nut (212) on the threaded hollow piston (214) is to fix a stroke length of the solid piston (204) to dispense a pre-determined volume of the liquid by the liquid dispenser (102).

10. The stroke controlling unit (108) as claimed in claim 9, wherein the threaded hollow piston (214) includes multiple threads wherein each of the multiple threads is of a pre-defined pitch corresponding to which the stroke length for the liquid dispensing unit (102) is adjusted.

11. The stroke controlling unit (108) as claimed in claim 9, wherein the stroke controlling unit (108) is actuated by a stroke command unit (110).

12. The stroke controlling unit (108) as claimed in claim 9, wherein the nut (212) is to be repositioned on the threaded hollow piston (212) for changing a stroke length of the liquid dispenser (102) based on the predetermined volume of the liquid.

13. The stroke controlling unit (108) as claimed in claim 10, wherein the stroke controlling unit (108) operates on the liquid dispenser (102) for dispensing the liquid on plurality of substrates

(104) placed on a conveyer belt (106) at a rate of 80 substrates per minute
, Description:As Attached