Method for cutting and connecting two bands end to end, an unrolling machine and a cutting and connecting device

A method for cutting and connecting first and second bands end to end and which are at a stop in an unrolling machine comprising:

• a cutting and connecting device;
• and
• two spool carrier elements, one of the spool carrier elements supporting a spool configured for unrolling the first band ensuring feeding of the first band to the unrolling machine and the other spool carrier element supporting a spool configured for unrolling the second band forming a replacement band, each band having two opposite longitudinal edges and two opposite sides,
• wherein the cutting and connecting device includes two connection assemblies arranged symmetrically with respect to a cutting and connection plane and is configured for simultaneously and transversely cutting the two bands in the connection plane in a cutting direction and along a cutting line successively passing through the two longitudinal edges of each band, perpendicularly or at an angle with respect to the latter, each connection assembly including a mobile application support, and a straightening contact element,
• the method comprising the following steps according to phase A/ and phase B/:
• phase A/ during the unrolling of the first band:
• a/ engaging the second band between connection assemblies in order to place and maintain the second band in a preparation position in which the second band extends on both sides upstream and downstream of the cutting line;
• b/ placing, outside of the connection assemblies, adhesive on at least one of the mobile application supports shifted to the outside;
• and
• c/ immobilizing the second band in the cutting and connection plane;
• phase B/ during stopping of the unrolling of the first band at least in a downstream portion thereof:
• carrying out step b/ and/or step c/ when step b/ and/or step c/ are not carried out in phase A/;
• d/ immobilizing the first band in the connection plane;
• e/ simultaneously and transversely cutting the first and second bands in a direction and along the cutting line, which has the effect of separating each band into two band portions, on one hand, a cut downstream band portion located downstream of the cutting line, and, on the other hand, a cut upstream band portion located upstream of the cutting line and connected to the spools of the first and second bands;
• f/ maintaining the immobilization, in the connection plane, of the cut upstream band portion of the second band and of the cut downstream band portion of the first band;
• g/ disengaging, by displacement or rolling of the band, the downstream band portion of the second band and the upstream band portion of the first band in order to free a connection zone including the end of the downstream band portion of the first band and the end of the upstream band portion of the second band to be connected together;
• and
• h/ transferring, in the connection zone, the adhesive, simultaneously or successively, by applying the adhesive to one of the sides, or by applying adhesive on each side, of the respective ends of the cut upstream and downstream band portions to be connected in order to carry out a connection of the two bands together using the adhesive, in order to form a new feed band,
• wherein, in step h/ and when the first band and/or the second band are curved with one of the opposite sides thereof having a curvature, the method further comprises successively transferring, in the connection zone, the adhesive along an orientation of convexity of the curvature, the adhesive supported by the mobile application support located on a side of the convex curvature, and in straightening the curvature of the first band and/or of the second band, to make the latter as flat as possible by coming in contact with pressure on the opposite side of the cut band portions of the first and second bands to be connected, by an other opposite straightening contact element, then, optionally, in a second step, to be connected by additional adhesive in order to finalize the connection.

A device for cutting and connecting first and second bands end to end and which are at a stop, for an unrolling machine, the device comprising:

• a cutting and connecting device including two connection assemblies arranged symmetrically with respect to a cutting and connection plane;
• and
• two spool carrier elements, each configured for supporting a spool configured for unrolling the first band ensuring feeding of the first band to the unrolling machine, or the second band forming a replacement band, each band having two opposite longitudinal edges and two opposite sides,
• wherein the cutting and connecting device includes a transverse cutting system including a cutting device configured to displace the cutting device in a cutting direction and along a transverse cutting line, substantially perpendicular or at an angle with respect to the longitudinal edges, having an effect of simultaneously cutting the first and second bands, kept in an immobilized state in the connection plane, by successively through the respective longitudinal edges thereof,
• wherein each connection assembly, dedicated to either of the first and second bands, includes an adhesive applicator including an application support configured for holding a piece of adhesive tape, and configured for displacing the corresponding application support from a waiting position in time before the cutting, wherein the waiting position is located in the corresponding connection assembly to a position of application of the piece of adhesive tape, located in the connection plane, and vice versa, a first immobilizer configured for immobilizing the first band in the connection plane, and a second immobilizer configured for maintaining the second band in a preparation position and immobilizing the latter in the connection plane, and a disengagement system configured to disengage, after the cutting, by displacement or rolling up of the band, cut band portions not intended to be connected, to enable the application of one or two piece(s) of adhesive tape by movement of the two opposite application supports, and
• wherein displacement, after the cutting, includes displacing the corresponding application support in a single translation or rotation movement, from the waiting position thereof toward the application position thereof.

A device for cutting and connecting first and second bands end to end and which are at a stop, for an unrolling machine, device comprising:

• a cutting and connecting device including two connection assemblies arranged symmetrically with respect to a cutting and connection plane;
• and
• two spool carrier elements, each configured for supporting a spool configured for unrolling the first band ensuring the feeding of the first band to the unrolling machine, or the second band forming a replacement band,
• wherein the cutting and connecting device includes a transverse cutting system including a cutting device and configured to displace the cutting device in a cutting direction and along a transverse cutting line, substantially perpendicular or at an angle with respect to longitudinal edges, having an effect of simultaneously cutting the first and second bands kept in an immobilized state in the connection plane, by successively through the respective longitudinal edges thereof, and
• wherein each connection assembly, dedicated to either of the first and second bands, includes an adhesive applicator including an application support configured for holding a piece of adhesive tape, and configured for displacing the corresponding application support from a waiting position located in the corresponding connection assembly to a position of application of the piece of adhesive tape, located in the connection plane, and vice versa, a first immobilizer configured for immobilizing the first band in the connection plane, and a second immobilizer-configured for maintaining the second band in a preparation position and immobilizing the latter in the connection plane, and a disengagement configured to disengage, after the cutting, by displacement or rolling up of the first and second bands, the cut band portions not intended to be connected, in order to enable, as desired, the application of one or two piece(s) of adhesive tape by movement of the two opposite application supports,
• wherein the device is configured for displacing the corresponding application support in a single rotation movement, and
• wherein the displacement for the application consists of a lever system including, on one hand, a drive rod to which the corresponding application support is fastened, which is configured for pivoting around a first pivot parallel to the cutting and connection plane, and, on the other hand, an actuator configured for acting on a connecting rod to bring about the pivoting thereof, the actuator consisting of a jack comprising a rod hinged at the end thereof to the connecting rod around a second pivot, while a body of the jack is pivotably mounted around a third pivot parallel to the first and second pivots.