Rotary tattoo machine

1. A rotary tattoo machine, comprising:

a machine body having a recess; and

a cam wheel for insertion into the recess of the machine body, comprising:

a first retaining element;

a cam located on top of, and coaxially with, the first retaining element, the cam coupled with the first retaining element, wherein the cam is configured for coupling with an axle of an electric motor, such that rotation of the axle rotates the cam, and wherein the cam includes a location on its top surface, such that the location is not coaxial with the cam;

a needle driving shaft coupled with the location on the top surface of the cam, wherein the shaft extends upwards from the cam;

a drive element coupled to the shaft, wherein the drive element is further coupled with a needle

wherein the recess in the machine body comprises a substantially cylindrical bore adapted to accept the first retaining element, and wherein the bore includes a shoulder that prevents the first retaining element from traveling through the bore; and

wherein the cam includes a sleeve adapted for insertion into, and coupling with, the first retaining element, such that rotation of the sleeve rotates the first retaining element and the cam.

2. The rotary tattoo machine of claim 1 , wherein the sleeve of the cam is adapted for coupling with the axle of the electric motor, such that rotation of the axle rotates the cam.

3. The rotary tattoo machine of claim 2 , wherein the sleeve that is inserted into, and coupled with, the first retaining element defines a six sided interior adapted to receive a hexagonal gear coupled to the axle of the electric motor.

4. The rotary tattoo machine of claim 3 , wherein the location on the top surface of the cam comprises a cylindrical bore that is not coaxial with the cam.

5. A rotary tattoo machine, comprising:

a machine body having a recess; and

a cam wheel for insertion into the recess of the machine body, comprising:

a first bearing having an inner race;

a cam located on top of, and coaxially with, the first bearing, the cam coupled with the inner race of the first bearing, wherein the cam is configured for coupling with an axle of an electric motor, such that rotation of the axle rotates the cam, and wherein the cam includes a location on its top surface, such that the location is not coaxial with the cam;

a second bearing for coupling with the location on the top surface of the cam;

a needle driving shaft coupled with an inner race of the second bearing, wherein the shaft extends upwards from the second bearing; and

a drive element coupled to the shaft, wherein the drive element is further coupled with a needle.

6. The rotary tattoo machine of claim 5 , wherein the recess in the machine body comprises a substantially cylindrical bore adapted to accept the first bearing, and wherein the bore includes a shoulder that prevents the first bearing from traveling through the bore.

7. The rotary tattoo machine of claim 6 , wherein the cam includes a sleeve adapted for insertion into, and coupling with, an inner race of the first bearing, such that rotation of the sleeve rotates the inner race of the first bearing and the cam.

8. The rotary tattoo machine of claim 7 , wherein the sleeve of the cam is adapted for coupling with the axle of the electric motor, such that rotation of the axle rotates the cam.

9. The rotary tattoo machine of claim 8 , wherein the sleeve that is inserted into, and coupled with, the inner race of the first bearing defines a six sided interior adapted to receive a hexagonal gear coupled to the axle of the electric motor.

10. The rotary tattoo machine of claim 9 , wherein the location on the top surface of the cam comprises a cylindrical bore that is not coaxial with the cam, and wherein the cylindrical bore is adapted to accept the second bearing.

11. A rotary tattoo machine, comprising:

a machine body having a recess; and

a cam wheel for insertion into the recess of the machine body, comprising:

a first bearing having an inner race;

a cylindrical cam located on top of, and coaxially with, the first bearing, the cylindrical cam including a tubular element that resides within the inner race of the first bearing, wherein the tubular element is configured for coupling with an axle of an electric motor such that rotation of the axle rotates the cylindrical cam and wherein the cylindrical cam includes a location on its top surface, such that the location is not coaxial with the cylindrical cam;

a second bearing for coupling with the location on the top surface of the cylindrical cam;

a needle driving shaft coupled with an inner race of the second bearing, wherein the shaft extends upwards from the second bearing; and

a drive element coupled to the shaft, wherein the drive element is further coupled with a needle.

12. The rotary tattoo machine of claim 11 , wherein the recess in the machine body comprises a substantially cylindrical bore adapted to accept the first bearing, and wherein the bore includes a shoulder that prevents the first bearing from traveling through the bore.

13. The rotary tattoo machine of claim 12 , wherein the cam includes a sleeve adapted for insertion into, and coupling with, an inner race of the first bearing, such that rotation of the sleeve rotates the inner race of the first bearing and the cam.

14. The rotary tattoo machine of claim 13 , wherein the sleeve of the cam is adapted for coupling with the axle of the electric motor, such that rotation of the axle rotates the cam.

15. The rotary tattoo machine of claim 14 , wherein the sleeve that is inserted into, and coupled with, the inner race of the first bearing defines a six sided interior adapted to receive a hexagonal gear coupled to the axle of the electric motor.

16. The rotary tattoo machine of claim 15 , wherein the location on the top surface of the cam comprises a cylindrical bore that is not coaxial with the cam, and wherein the cylindrical bore is adapted to accept the second bearing.