Apparatus for processing substrate surface

1. An apparatus for processing a surface of a substrate by subjecting the surface of a substrate to successive surface reactions of at least a first precursor and a second precursor, the apparatus comprising:

at least one nozzle head having two or more precursor zones for subjecting the surface of the substrate to at least the first and second precursors;

a transport cylinder for transporting the substrate; and

a moving mechanism for moving the nozzle head in relation to the transport cylinder in oscillating movement between a first end position and a second end position around a central axis of the transport cylinder,

wherein the nozzle head is arranged in connection with the transport cylinder such that an output face of the nozzle head is formed to conform to a transport surface of the transport cylinder

wherein the moving mechanism is arranged to move the nozzle head in oscillating movement between the first and second end positions around the central axis of the transport cylinder and to store at least part of the kinetic energy of the nozzle head released in the oscillating movement of the nozzle head,

wherein the moving mechanism comprises a pendulum that swings the nozzle head in the oscillating movement between the first and second end positions, and

wherein the pendulum is arranged to store at least part of the kinetic energy of the nozzle head into gravitational potential energy at the first and second end positions of the oscillating movement of the nozzle head.

2. An apparatus according to claim 1 , wherein at least part of the moving mechanism is arranged to store at least part of the kinetic energy of the nozzle head released in decelerating the nozzle head as it approaches the end positions.

3. An apparatus according to claim 1 , wherein at least part of the kinetic energy of the nozzle head is stored as potential energy.

4. An apparatus according to claim 3 , wherein at least part of the kinetic energy of the nozzle head is stored as gravitational potential energy in at least one of the first and second end positions.

5. An apparatus according to claim 3 , wherein at least part of the kinetic energy of the nozzle head is stored as elastic potential energy in at least one of the first and second end positions.

6. An apparatus according to claim 5 , wherein at least part of the kinetic energy of the nozzle head is stored as potential energy of a spring or a pressure medium.

7. An apparatus according to claim 3 , wherein at least part of the kinetic energy of the nozzle head is stored as electrical potential energy in at least one of the first and second end positions.

8. An apparatus according to claim 7 , wherein the kinetic energy of the nozzle head is stored as magnetic potential energy.

9. An apparatus according to claim 1 , wherein at least part of the kinetic energy of the nozzle head is stored to a kinetic energy element as kinetic energy.

10. An apparatus according to claim 1 , wherein the kinetic energy element is a flywheel or a rotating element.

11. An apparatus according to claim 1 , wherein the nozzle head forms the weight of the pendulum, or that a separate weight is connected to the nozzle head for providing the swinging movement of the nozzle head.

12. An apparatus according to claim 1 , wherein the transport cylinder has an outer surface along which a flexible elongated substrate is transported, and the nozzle head is arranged to move by pendulum movement at a substantially constant distance from the outer surface of the transport cylinder.

13. An apparatus according to claim 1 , wherein the nozzle head is formed as cylindrical nozzle head having a central axis and substantially circular circumference at a constant distance central axis, and that the moving mechanism is arranged to rotate the nozzle head around the central axis of the nozzle head by an oscillating rotational movement between the first and second end positions.

14. An apparatus according to claim 1 wherein the moving mechanism is arranged to store at least part of the rotational kinetic energy of the nozzle head into potential energy of a spring or a pressure medium at the end positions of the rotational movement of the nozzle head.

15. An apparatus according to claim 1 wherein the moving mechanism is arranged to store at least part of the rotational kinetic energy of the nozzle head into kinetic energy of a rotating element of a flywheel.

16. An apparatus according to claim 1 , wherein the moving mechanism is arranged to use the stored kinetic energy for further moving the one or more nozzle heads.