Metering needle assembly

摘要

A tattooing device includes a disposable syringe in which a tattoo dye is dispensed through a passageway in a needle of the syringe. A cam member is rotated to rotate a clutch rod held in a clutch member. The clutch rod rotates a threaded rod through a fixed nut member that causes the threaded rod to move linearly towards the syringe to displace a plunger pin fixed to the threaded rod. The plunger pin thereby displaces a plunger of the syringe to dispense the tattoo dye through the needle.