Winding machine with an evaluation system of the web material being processed and method
The machine ( 1; 100 ) comprises a winding station ( 3; 101 ), adapted to receive secondary winding cores (T) coaxial with, and adjacent to, one another. A cutting device ( 11; 104 ) is also provided, with a plurality of blades ( 13; 105 ), arranged upstream of the winding station ( 3; 101 ) with respect to the feeding direction of the web material (N) and adapted to subdivide the web material into plurality of strips (S 1 -S 5 ) of web material; The machine has a web material evaluation system and a programmable unit ( 71 ) for processing data collected by the web material evaluation system.
1. A machine for winding a web material into a plurality of secondary reels, the machine comprising:
a winding station, adapted to receive secondary winding cores coaxial with, and adjacent to, one another;
a cutting device, with a plurality of blades, arranged upstream of the winding station with respect to the feeding direction of the web material and adapted to divide the web material into a plurality of strips of web material;
a web material evaluation system; and
a programmable unit for processing data collected by the web material evaluation system, wherein:
the web material evaluation system is adapted to detect at least one of the following:
the position of at least one longitudinal edge of the web material; the width of at least one strip of web material; and
the programmable unit is configured to modulate at least one parameter of at least one feeding member of the web material as a function of the detection of the web material evaluation system.
2. The machine of claim 1 , wherein the programmable unit is configured to modulate said at least one parameter to modulate the tension of the web material, or to prevent shifting of the web material in transversal direction.
3. The machine of claim 2 , wherein said parameter is the speed of said at least one feeding member.
4. The machine of claim 1 , wherein the web material evaluation system comprises a system for taking images of the web material.
5. The machine of claim 4 , wherein the image taking system comprises at least one of the following combinations:
a single camera adapted to frame a first face of the web material;
a first camera adapted to frame a first face of the web material and a second camera adapted to frame a second face of the web material;
a plurality of cameras adapted to frame a first face of the web material and a further camera, or a plurality of further cameras adapted to frame a second face of the web material.
6. The machine of claim 5 , wherein to each camera a lighting device is associated for lighting a portion of web material framed by the camera; and wherein at least one camera and the respective lighting device are arranged at opposite sides of a feeding path of the web material, so that the camera captures transmitted images of the web material; and/or wherein at least one camera and the respective lighting device are arranged on the same side of the web material feeding path, so that the camera captures reflected images of the web material.
7. The machine of claim 1 , wherein the web material evaluation system is arranged in an area of the web material feeding path comprised between the cutting device and the winding station.
8. The machine of claim 1 , wherein the web material evaluation system comprises detection members for detecting a presence of metal residues in the web material.
9. The machine of claim 1 , wherein said parameter is the speed of said at least one feeding member.
10. A method for winding a web material, comprising the following steps:
feeding a web material along a feeding path towards a winding station, where a series of winding cores, coaxial with, and adjacent to, one another, are inserted;
cutting the web material into a plurality of strips of web material along the feeding path;
winding the strips of web material and forming therewith a plurality of secondary reels;
detecting at least one of the following features of the web material: a position of at least one longitudinal edge of the web; and a width of at least one strip of web;
modulating at least one web feeding member as a function of the detected feature;
winding at least a first series of secondary reels, each formed by a strip of web material, on respective winding cores of a first series of winding cores arranged in the winding station; wherein the strips of web material are formed by cutting by means of a plurality of blades arranged in a first cut position;
while winding the first series of secondary reels, detecting information on the position taken by the edges of the strips of web material and, based on said information, determining the actual width of the strips wound on the secondary reels of the first series and the reciprocal distance between adjacent strips;
removing the first series of secondary reels from the winding station;
according to the actual width of the strips and the reciprocal distance between the strips, repositioning the blades in a second cut position so as to take into account the transverse contraction of the strips of web material;
positioning a second series of winding cores in the winding station, the cores of the second series being dimensioned and positioned according to the actual width of the strips and to the reciprocal distance between the strips; and
winding a second series of secondary reels on the second series of winding cores.
11. The method of claim 10 , wherein said at least one parameter is a speed of said at least one feeding member.
12. The method of claim 11 , wherein the web material is unwound from a primary reel.
13. The method of claim 10 , wherein the web material is unwound from a primary reel.
14. The method of claim 10 , wherein the step of detecting at least one feature of the web material comprises the step of acquiring images of at least one face of the web material.
15. The method of claim 10 , wherein said feature of the web material is detected in a portion of the feeding path downstream of a cutting device, which cuts the web material into strip of web material.
16. The method of claim 10 , wherein the step of modulating said at least one web material feeding member comprises the step of reducing the feeding speed of the web material if the longitudinal edge of the web material is shifting laterally.
17. The method of claim 10 , wherein the step of modulating at least one web feeding member comprises the step of modulating a tension of the web material according to the detected feature.
18. The method of claim 17 , wherein the step of modulating the tension comprises the step of varying the feeding speed of the web material in at least one point of the feeding path.