Winding apparatus and method
It is described a winding apparatus for wrapping a material around a core of flat shape that rotates around a rotation axis rotating in its turn with a circular trajectory, controlling the laws of motion both of the core rotation around its axis and of the circular trajectory of its rotation axis, motor driven independently by means of electric cams, such as to cancel the variations of position and speed of the material at the entrance of the core The winding apparatus is used for producing electric energy accumulating devices.
1. A winding apparatus comprising:
a frame;
a support mounted on said frame for rotatable motion around a first rotation axis;
a first motor axis for rotating said support;
a core on which to wrap material;
wherein said core is mounted on said support for rotatable motion around a second rotation axis that is not coaxial with said first rotation axis and wherein said apparatus comprises a second motor axis for rotating said core, said first motor axis and said second motor axis being driven independently of one another.
2. The apparatus according to claim 1 , wherein said second motor axis is coaxial with said first rotation axis.
3. The apparatus according to claim 1 , comprising a material supplying arrangement for supplying material in a supplying plane and a movement arrangement for moving said frame in at least one direction that is transverse to said supplying plane to take account, during winding, of the accumulation of material wrapped around the core.
4. The apparatus according to claim 1 , wherein said core is of non-circular shape.
5. The apparatus according to claim 1 , comprising a programmable electronic control arrangement provided with computer program instructions for controlling said first and said second motor axis with first and second rotation speeds, respectively, that are different from one another.
6. The apparatus according to claim 5 , wherein at least one of said first and second rotation speeds is a non-constant rotation speed.
7. The apparatus according to claim 5 , wherein said first and second rotation speeds are generated having as constraints at least two parameters comprising at least one position of a portion of the core or of a portion of the material and at least one speed of a portion of the core or of a portion of the material.
8. The apparatus according to claim 1 , wherein said first motor axis is not coaxial with said first rotation axis.
9. The apparatus according to claim 1 , wherein said second motor axis has a portion that is rotatably coupled with said frame and a portion that is rotatably coupled with said support.
10. The apparatus according to claim 1 , comprising at least one mechanism for transmitting the motion from said second motor axis to said core.
11. The apparatus according to claim 10 , wherein said support is shaped so as to define a containing volume that contains at least one part of said mechanism.
12. The apparatus according to claim 10 , comprising a motion transmitting arrangement for transmitting the motion from said first motor axis to said support, said motion transmitting arrangement being distinct from said mechanism.
13. The apparatus according to claim 10 , wherein said mechanism comprises at least one toothed wheel that is rotatably mounted on said support around a third rotation axis that is not coaxial with said first rotation axis and is not coaxial with said second rotation axis.
14. A method for producing electric energy accumulating devices using a winding apparatus according to claim 1 to wind at least one of an electrode and a separator.