Laminating apparatus
There is described a laminating apparatus for coupling electrodes of non-rectangular shape with a separating film for the manufacture of electric energy accumulating devices, wherein a pair of laminating rollers has a roller driven by an elastic arrangement loaded with a variable force adjusted by an endless screw conveyor controlled by a brushless motor, during the passage of the electrodes, so as to vary the laminating force according to the width of the electrode laminated instant by instant, in order for the laminating pressure to remain almost constant.
1. Laminating apparatus, comprising a first and a second laminating roller that are opposite each other to define a laminating zone extending in width and through which there passes a product subjected to a laminating force applied by the rollers and supplied in an advancement direction that is transverse to the width of the laminating zone, said first roller being rotatably mounted on a support connected to a movable element the movement of which causes a variation in the laminating force between said rollers, said apparatus comprising a motor that drives the movement of said movable element and a programmable electronic control unit configured to move said movable element whilst the product traverses the laminating zone so as to vary the laminating force depending on the width of the product instant by instant as the product passes through the laminating zone causing laminating pressure to remain constant.
2. Apparatus according to claim 1 , wherein said support is connected to said movable element by an elastic arrangement, such that the movement of said movable element causes a variation in a load of said elastic arrangement and the consequent variation in the laminating force between said rollers.
3. Apparatus according to claim 1 , wherein said control unit is configured to receive information on the product to be laminated relating to the shape and/or type of the product, and control a motion of said movable element on the basis of the information received.
4. Apparatus according to claim 3 , wherein said control unit is configured to store two or more motions of said movable element and associate said received information with one of said two or more motions.
5. Apparatus according to claim 1 , comprising a sensor for measuring the laminating force applied to said first roller, said control unit being configured to receive a desired variation of the laminating force and for determining a desired motion of said movable element which causes the desired variation of the laminating force.
6. Apparatus according to claim 5 , wherein said sensor arrangement comprises at least one load cell or another force transducer.
7. Apparatus according to claim 1 , wherein said movable element is integral with a translating part of a mechanism for transforming a rotary motion of a shaft of said motor into a translation movement of said translating part.
8. Apparatus according to claim 7 , wherein said motion transforming mechanism comprises a screw-nut screw mechanism.
9. Apparatus according to claim 8 , wherein said screw-nut screw mechanism comprises a ball bearing screw.
10. Apparatus according to claim 1 , wherein said motor comprises a brushless motor.
11. Apparatus according to claim 1 , comprising an additional elastic arrangement designed to support at least one part of the weight of said first roller.
12. Apparatus according to claim 1 , comprising a sensor arrangement arranged upstream of said laminating zone, along a supplying path of the product to be laminated, to detect the position of the product itself, said control unit being configured to bring said motor into phase with the detected position of the product, such that the variation in the laminating force be in phase with the passage of the product through the laminating zone.
13. Apparatus according to claim 1 , wherein said rollers have axes that are parallel to each other, and said movable element translates in a translation direction perpendicular to the roller axes.
14. Method for manufacturing an electric energy accumulating device, wherein a laminating apparatus according to claim 1 is used to couple at least one flat electrode with at least one separating film.