Gobo retaining spring system

1. A gobo wheel assembly, comprising:

a gobo wheel, having a plurality of gobo wheel holding parts, which each are spaced from one another, and which each hold gobos, forming a plurality of different surfaces for holding a plurality of different gobos, said gobo wheel having a toothed outer wheel which is rotatable; and

a gobo holding part, holding a gobo, and having first and second movable spring parts which are movable and are attached to said gobo holding part, and having surfaces which each fit in said gobo wheel holding parts on said gobo wheel and are insertable and removable from said gobo wheel, said first and second movable spring parts holding said gobo into one of said surfaces on said gobo wheel, where said first and second spring holding parts respectively hold first and second sides of said gobo holding parts into said gobo wheel holding part, but do not extend completely around said gobo holding part, wherein said first and second spring holding parts are coupled to a movable toothed outer wheel part of said gobo holding part, which when said spring holding parts are inserted, presses the toothed outer wheel of said gobo holding part against the toothed outer wheel of said gobo wheel, and allows said gobo wheel to rotate when said toothed outer wheel of said gobo wheel rotates, and without rotating said spring parts.

2. An assembly as in claim 1 , wherein said spring parts receive surfaces of said gobo which presses apart said spring are opened to remove the spring force and to separate said gobo assembly from said gobo holding assembly.

3. An assembly as in claim 1 , further comprising an extending tongue part, which extends from said gobo holding part into a corresponding slot on said gobo wheel assembly.

4. An assembly as in claim 1 , wherein said spring parts are coupled to said gobo wheel assembly.

5. An assembly as in claim 1 , wherein said spring parts are separated to make more distance between said spring parts by an amount that allows a wheel to be inserted therein.

6. An assembly as in claim 1 , wherein said spring parts surround first and second opposite sides of said wheel assembly, and surround said wheel assembly by more than 180 degrees.

7. A method of holding and removing gobos from a holder, comprising:

moving first and second spring parts on a gobo holding wheel against their spring force;

while holding said first and second spring parts against said spring force, removing a gobo holder from said gobo holding wheel that was held by said first and second spring parts;

inserting a new gobo holder on said gobo holding wheel while holding said first and second spring parts against said spring force; and

using said spring parts to hold an unmovable part of said new gobo wheel, at two surfaces of said new gobo wheel; and

rotating a moving part of said new gobo wheel while said unmovable part is held to said gobo holding wheel and said unmovable part does not rotate while said moving part rotates.

8. A method as in claim 7 , wherein said moving said spring parts comprises depressing said spring parts towards a top surface of said gobo holding wheel.

9. A method as in claim 8 , further comprising extending a tongue part from said gobo holding assembly into a corresponding slot on said gobo wheel assembly.

10. A method as in claim 7 , wherein said spring parts are separated to make more distance between said spring parts by a surface of said gobo pressing thereagainst.

11. A method as in claim 10 , wherein said spring parts surround first and second opposite sides of said wheel assembly, and surround said wheel assembly by more than 180.degree.

12. A method as in claim 7 , further comprising holding said gobo holder into place using a second spring.

13. A method as in claim 7 , wherein said moving said spring parts comprises pressing said first and second spring parts towards a surface of the gobo holding wheel.