Abstract: A rotary tattoo machine includes an inner housing; a tattoo needle; an electric motor including a shaft assembly; and a bearing arm including a bearing. The machine also includes a cam, the cam moving up and down the shaft assembly due to the rotation of the shaft assembly and the bearing, the moving of the cam to drive the tattoo needle from a retracted position to an extended position. The device my also include an outer housing or grip. The dimensions of or a shape of the cam reduces an amount of dwell time of the tattoo needle. The cam may be replaced by an alternate cam, the alternate cam having different dimensions or a different shape from the dimensions of or the shape of the original cam and the alternate cam to have a different amount of dwell time associated with the tattoo needle.

Abstract: A tattoo needle pneumatic operating mechanism which utilizes a housing which has an internal cavity. A fan gear is rotatably mounted within the cavity. A cam is attached to the fan gear. Mounted on the cam is a cam lobe. The cam lobe is to engage with a cam surface which is mounted in conjunction with a slide. A tattoo needle is mounted to the slide. Revolving of the fan gear by air pressure causes the slide to reciprocate which causes the needle to reciprocate.