Folding device

1. A folding blade apparatus comprising:

at least one folding jaw cylinder;

a first folding blade cylinder adapted to work with said folding jaw cylinder in a first working position defined by said first folding blade cylinder and said folding jaw cylinder;

a second folding blade cylinder adapted to work with said folding jaw cylinder in a second working position defined by said second folding blade cylinder and said folding jaw cylinder;

means for displacing said second folding blade cylinder between said second working position and a rest position, said second folding blade cylinder being moved away from said folding jaw cylinder in said rest position; and

at least first and second pairs of folding jaws on said folding jaw cylinder, said first folding blade cylinder working with said first pair of folding jaws and said second folding blade cylinder working with said second pair of folding jaws when said second folding blade cylinder is in said second working position.

2. The folding apparatus of claim 1 wherein said means for displacing said second folding blade cylinder includes plugs positionable between said second folding blade cylinder and said at least one folding jaw cylinder.

3. The folding apparatus of claim 1 further including a belt guidance system adapted to take signatures from said at least one folding jaw cylinder, said belt guidance system being positionable between said at least one folding jaw cylinder and said second folding blade cylinder in said rest position.

4. The folding apparatus of claim 1 further including means for mechanically displacing said second folding blade cylinder out of said working position in response to a voltage drop.

5. The folding apparatus of claim 1 further including drive motors in the folding apparatus, said drive motors acting as generators in response to a voltage drop and driving said first and second folding blade cylinders synchronously with said at least one folding jaw cylinder.

6. A folding apparatus comprising:

at least one folding jaw cylinder;

a folding blade cylinder adapted to work together with said at least one folding jaw cylinder;

means for displacing said folding blade cylinder between a working position and a rest position, said folding blade cylinder working with said folding jaw cylinder only in said working position of said folding blade cylinder;

an intermediate space between said at least one folding jaw cylinder and said folding blade cylinder when said folding blade cylinder is in said rest position; and

a folded signature guidance system positionable in said intermediate space only when said folding blade cylinder is in said rest position.

7. The following apparatus of claim 6 further including a second, stationary folding blade cylinder.

8. The folding apparatus of claim 6 further including pairs of folding jaws on said at least one folding jaw cylinder, each of said pairs of folding jaws acting with a separate folding blade cylinder.

9. The folding apparatus of claim 8 wherein each pair of folding jaws includes first and second folding jaws that are each displaceable circumferentially in said at least one folding jaw cylinder.

10. The folding apparatus of claim 6 wherein said folding blade cylinder includes a folding blade and a gripper, said folding blade and said gripper being displaceable circumferentially in said folding blade cylinder.

11. The folding apparatus of claim 6 wherein said means for displacing said folding blade cylinder includes plugs positionable between said folding blade cylinder and said at least one folding jaw cylinder.

12. The folding apparatus of claim 6 further including means for mechanically displacing said folding blade cylinder out of said working position in response to a voltage drop.

13. The folding apparatus of claim 6 further including drive motors in the folding apparatus, said drive motors acting as generators in response to a voltage drop and driving said folding blade cylinder synchronously with said at least one folding jaw cylinder.

14. A folding blade apparatus comprising:

at least one folding jaw cylinder;

a folding blade cylinder adapted to work together with said at least one folding jaw cylinder when said folding jaw cylinder is in a working position;

means for displacing said folding blade cylinder between said working position and a rest position in which said folding blade cylinder is moved away from said folding jaw cylinder; and

means for mechanically moving said folding blade cylinder out of said working position and to said rest position in response to a sensed voltage drop in the folding blade apparatus.

15. The folding apparatus of claim 14 further including a second, stationary folding blade cylinder.

16. The folding apparatus of claim 14 further including pairs of folding jaws on said at least one folding jaw cylinder, each of said pairs of folding jaws acting with a separate folding blade cylinder.

17. The folding apparatus of claim 16 wherein each pair of folding jaws includes first and second folding jaws that are each displaceable circumferentially in said at least one folding jaw cylinder.

18. The folding apparatus of claim 14 wherein said folding blade cylinder includes a folding blade and a gripper, said folding blade and said gripper being displaceable circumferentially in said folding blade cylinder.

19. The folding apparatus of claim 14 wherein said means for displacing said folding blade cylinder includes plugs positionable between said folding blade cylinder and said at least one folding jaw cylinder.

20. The folding apparatus of claim 14 further including a belt guidance system adapted to take signatures from said at least one folding jaw cylinder, said belt guidance system being positionable between said at least one folding jaw cylinder and said folding blade cylinder in said rest position.

21. The folding apparatus of claim 14 further including drive motors in the folding apparatus, said drive motors acting as generators in response to a voltage drop and driving said folding blade cylinder synchronously with said at least one folding jaw cylinder.

22. A folding apparatus comprising:

at least one folding jaw cylinder;

a first folding blade cylinder;

a first electric motor, said first electric motor driving both said at least one folding jaw cylinder and said first folding blade cylinder;

a second folding blade cylinder; and

a second electric motor driving said second folding blade cylinder, said second folding blade cylinder being driven by said second electric motor independently of said first folding blade cylinder.

23. The folding apparatus of claim 22 wherein both said first folding blade cylinder and said second folding blade cylinder are adapted to work with said at least one folding jaw cylinder.

24. The folding apparatus of claim 22 further including folding jaws defining an adjustable width folding jaw gap on said at least one folding jaw cylinder, said second electric motor driving said second folding blade cylinder for insertion of a folding blade on said second folding blade cylinder centered in said adjustable width folding jaw gap.