Dispenser and nozzle for discharging mixture of gas and paste material and mechanical foaming device

A dispenser used for discharging a mixture of gas and a paste material, the dispenser comprising:

• a nozzle part provided in a tip end part of the dispenser and having a tip end opening through which the mixture is discharged;
• a flow path for the mixture extending from an introduction part for the mixture to the tip end opening through an inside of the nozzle part;
• a needle part movable in the flow path of the nozzle part to open and close the flow path;
• and
• a driving part that drives the needle part, wherein
• the nozzle part has a tapered section in which an inside diameter of the flow path of the nozzle part decreases toward the tip end opening, the inside diameter being relative to an operation range of a tip end of the needle part,
• as a result of the tip end of the needle part abutting against a closed position of the tapered section, the flow path for the mixture is closed, whereas as a result of the tip end of the needle part moving away from the closed position, the flow path is opened,
• the dispenser further comprises a stopper part that limits a moving range of the tip end of the needle part to a range from the closed position to a stop position located rearward relative to the closed position, and a stopper position adjusting part that adjusts a position of the stopper part to change the stop position,
• wherein the stopper position adjusting part comprises
• a rod screwed into a body of the dispenser in an axial direction, a position of the rod in the axial direction being adjusted according to an amount of being screwed into the body, the needle part being stopped as a result of a tip end part of the rod abutting against a basal end part of the needle part, and
• a pressure sensor that measures a pressure of the mixture in the flow path,
• wherein the stopper position adjusting part further includes any one of (i) and (ii):
• (i) an electric motor disposed to rotate the rod, and a controller that controls the stop position by controlling a rotation amount of the rod rotated by the electric motor, such that the pressure measured by the pressure sensor falls in a desired pressure range with respect to a discharge flow amount of the mixture;
• (ii) a mechanism that makes the rod manually rotatable, and
• a display unit that displays the pressure measured by the pressure sensor
• wherein the operation range of the needle part is adjustable manually by adjusting a rotation amount of the rod rotated by the mechanism while looking at the pressure level detected by the pressure sensor and displayed by the display unit, and
• wherein the dispenser is configured such that the pressure of the mixture dispensed from the tip end opening is controlled by adjusting the operation range of the needle part with respect to the discharge flow amount of the mixture.