EP0699610B1 - Device for cutting and gluelessly applying the web leading end for a new web roll onto the core of a winder - Google Patents

Description

The present invention relates to the field of winding machines strip materials for the production of coils and relates to a device cutting and applying, without glue, the strip start of a new reel on a reel mandrel.

The winding of strips by means of winding machines poses generally the problem, on the one hand, of the cutting of the strip and, on the other hand, of the correct application of the end of the strip to the mandrel after cutting. AT this effect, it is possible to make the cut while the strip is running following a principle called cutting on the fly, in which a knife is thrown in the path of the strip and the cut end of the strip is projected onto a mandrel pre-glued or fitted with one or more adhesive strips of receiving said end, which is further clamped on said mandrel by the strip during its winding.

Such a cut during the running of the strip allows a continuous production, practically without slowing down of the running speed of the strip when cutting.

However, in the case of the winding of strips of materials relatively brittle, such as mica films, plating, or the like, a cutting on the fly compromises the good performance of the cut end which can possibly be damaged over a relatively long length, or even tend to break the tape at a distance from the place of the cut, which can cause poor winding, or even winding fault, the tape not even being applied to the new one mandrel or having a flap.

It is also known to make the cut at a standstill, that is to say the full reel being stopped after winding, the strip to be wound then being temporarily stored in an accumulator located upstream of the wrap.

In such a case the cut is carried out manually by two operators, one of whom holds the end of the cut strip while the other glue the new mandrel, then apply said end to said new mandrel, the start of which is controlled by one of the two operators. Such embodiment requires, however, operator intervention in a machine running, which necessarily entails a risk of accident.

In addition, certain strip materials require winding on the receiving mandrel without applying glue or adhesive tape, by simple pinching of the first coiled turns, with a view to their transformation later. Such a winding is particularly difficult to achieve, avoiding any risk of slipping when starting the winding in the case for winding relatively rigid materials.

We also know, from GB-A-1 154 662, a cutting device of strips and winding of the start of the strip on a new mandrel, in which said new mandrel is surrounded over most of its circumference by a shell in two elements hinged together, the action of cutting of the strip having the effect, in the pursuit of the movement of the knife, to bring the start of the tape in a corner formed for this purpose to the part corresponding to the shell.

Furthermore, this document GB-A-1 154 662 describes a first means pivoting partially surrounding the new mandrel and a second means pivot for making the cut of the strip to be wound. This second plea swivel consists, in fact, only of a serrated knife, extending over the entire width of the pivoting means and disposed at the end of a pressurized air box and tending to carry out the introduction of the beginning of the strip into the shell formed by the first pivoting means, upon arrival at the end of the knife cutting stroke, this introduction being favored by air blowing. However, due to a cut along a serrated line, in case of winding of a particularly material flexible, blowing air combined with rapid rotation may not present a sufficient effectiveness to avoid folding of the tips of the teeth.

Furthermore, DE-A-39 00560 describes a device for winding a start of strip on a mandrel, this device consisting of a pair of prongs each provided with an articulated partial closing lever, said claws and their articulated levers being interconnected by shafts guided in rotation, on which are mounted parallel belts.

Thus, the device can be caused to extend partially around of the new mandrel, on which the strip must be wound, the belts being intended, on the one hand, to apply the start of strip to the new mandrel, and, on the other hand, to guide it around said mandrel until at least one revolution winding, this avoiding any overturning of the front end of the strip or during the winding of the first turn.

This device does not, however, provide a second means intended to perfect the introduction of the strip into the device, as well as its hold without crease during the realization of the first turn. Indeed, it is not planned no movable means tending to follow the movement of the end of the strip at wrap.

Finally, we know from US-A-4 326 679 a device for cutting a tape and applying its end to a new mandrel, this device using lateral means for applying the strip on a part significant circumference of the new mandrel, as well as a means of cutting of said band.

This document in no way describes, at the end of one of the means application of the tape around the new mandrel, transverse means of deflection for the strip to be cut and wound. Similarly, there are no plans to additional means ensuring an additional belt tension during the cutting, so that after said cutting occurs a tendency to create a slack on the corresponding part of the strip, which results in an application random end of it on the new mandrel.

The object of the present invention is to overcome these drawbacks by proposing a cutting and application device making it possible to surround a new mandrel over most of its periphery to promote winding of a strip start following a cut of said strip, this cut being a straight cut, frank and not serrated.

It has, in fact, for a cutting and application device, without glue, from the beginning of the strip of a new reel on a mandrel of a reel, essentially constituted by a first pivoting means for cutting the tape to roll up and apply the end of the latter on a new mandrel, without prior gluing of the latter, and by a second means swivel for inserting, after cutting, the end of the strip into the first pivoting means and application of said strip on the new mandrel, the second pivoting means comprising a set for applying the end of strip on the mandrel extending between arms pivotally mounted on the chassis the machine to unroll, the first pivoting means comprises a support crosspiece a cross-cut knife in the form of a carriage guided on the cross member and actuated by a jack and cooperating with a transverse anvil also extending between arms forming a pivoting frame constituting the first pivoting means, said anvil forming a stop for an anvil analog fixed to the corresponding end of the second pivoting means, the plane of cutting the knife being preferably located near the axis of a tree lower guide and support for a first set of elastic belts parallel.

la figure 1 est une vue en coupe et en élévation latérale du dispositif conforme à l'invention en position de coupe avant enroulement du début de bande sur le nouveau mandrin ;

la figure 2 est une vue analogue à celle de la figure 1, le dispositif étant en position de repos, et

la figure 3 est une vue en élévation latérale et en coupe, à plus grande échelle, des extrémités actives du dispositif conforme à l'invention en position de coupe et de début d'enroulement.

The invention will be better understood from the description below, which relates to a preferred embodiment, given by way of nonlimiting example, and explained with reference to the appended schematic drawings, in which:

Figure 1 is a sectional view in side elevation of the device according to the invention in the cutting position before winding the start of the strip on the new mandrel;

FIG. 2 is a view similar to that of FIG. 1, the device being in the rest position, and

Figure 3 is a side elevational view in section, on a larger scale, of the active ends of the device according to the invention in cutting position and start of winding.

As shown in Figures 1 to 3 of the accompanying drawings, the device for cutting and applying, without glue, the start of a new strip coil on a mandrel 1 of a reel essentially consists of a first pivoting means 2 for cutting the strip 3 to be wound up and applying the end of the latter on a new mandrel 1, without prior gluing of the latter, and by a second pivoting means 4 for introducing, after cutting, the end of the strip 3 in the first pivoting means 2 and for applying said strip 3 on the new mandrel 1.

The first pivoting means 2 is constituted by a pivoting frame formed by a pair of arms 5 extending parallel near the edges of the frame 6 of the winding machine, interconnected by a cross member 7 supporting a cross-cut knife 8 and each actuated by a jack 11 and by a first set of parallel elastic belts 9, endless, mounted on at least a pair of parallel shafts 10, guided in rotation, at their ends on the arms 5 (Figures 1 to 3).

The parallel elastic belts 9 are preferably mounted on three trees arranged in parallel so as to form in vertical section a triangle, one of whose sides formed by the belts 9 is deformable elastically by application against the mandrel 1 and one of the vertices of which is formed by one of the shafts 10, is movable by pivoting, by means of a pair of arms 12, represented in FIG. 3 by a simple center line. So when pivoting of the arms 5 carrying the shafts 10 with the belts 9 and of the application said belts 9 on the mandrel 1, there is a tension of the belts 9 due to their deformation during winding on the mandrel 1, this tension being compensated by a pivoting of the shaft 10 mounted on the arms 12.

According to a characteristic of the invention, the elastic belts 9 are loaded in the rest position by a tensioning device preliminary constituted by a roller or a shaft 13 pivotally mounted on the chassis formed by the arms 5 by means of pivoting levers 14, shown in Figure 3 by a center line, said levers being loaded by return springs (not shown), tending to tension the belts 9 between the two fixed shafts 10 in the direction of the new mandrel 1.

The arms 5 carrying the shafts 10 advantageously have a cutting into a portion of a circle 15 extending between the bearings of the two shafts fixed 10 for supporting the belts 9. Thus, a passage for the mandrel 1 is released on the arms 5 allowing perfectly the application of the belts on said mandrel 1 without risk of contact of the arms 5 with the ends of the mandrel 1 or with the latter's support hubs.

According to a characteristic of the invention, teeth 16 are arranged at regular intervals on a shaft 17 extending between the arms 5 near their free end, that is to say near the bearings of the fixed shaft 10 most the exterior with respect to the pivoting arms 5, the ends of said teeth 16 projecting beyond the free ends of the arms 5 and extending pivotally towards the mandrel 1 inwards relative to the cut in a portion of a circle 15, these pivoting teeth 16 being loaded at their other end by springs of return 18 and coming into abutment against stops 19, the return springs and stops being advantageously mounted on crosspieces connecting the arms 5. Thus, the first pivoting means has beak-shaped elements formed by the teeth 16 and tending to apply intimately the end of the strip to be wound on the chuck 1.

The cross-cut knife 8 is in the form of a carriage guided on the cross-member 7 and actuated by a jack and cooperates with a transverse anvil 20 also extending between the arms 5, this so-called anvil 20 forming a stop for a similar anvil 21 fixed at the end corresponding to the second pivoting means 4, the cutting plane of the knife 8 preferably being located near the axis of the lower fixed shaft 10 of guide and support of the first set of parallel elastic belts 9 (figure 3).

The second pivoting means 4 is constituted by two parallel arms upper 22, pivotally mounted on the chassis 6 of the unwinding machine and each actuated at one end by a jack 23, their other end having a hook shape in an arc 24, and by a set 25 of application of the end of the strip on the mandrel 1 extending between the arms 22.

The assembly 25 for applying the strip end to the mandrel 1 is constituted by a second train of parallel elastic belts 26, without end, mounted on at least two pairs of parallel shafts 27 extending between the arms superiors 22.

The parallel elastic belts 26 are preferably mounted on three parallel shafts 27 forming a triangle with variable section, one of which sides formed by the belts 26 is elastically deformable by application against the mandrel 1 and one of the vertices of which is formed by one of the shafts 27, is pivotally movable, via a pair of arms 28 (shown by their center line in Figure 3). In addition, the elastic belts 26 are loaded in the rest position by a tensioning device preliminary consisting of a roller or a shaft 29 pivotally mounted between the upper arms 22 by means of pivoting levers 30, represented by their center line in Figure 3, said levers being loaded by return springs (not shown), tending to tension the belts 26 between the two fixed shafts 27 in the direction of the new mandrel 1.

According to another characteristic of the invention, and as shown more particularly FIG. 3 of the accompanying drawings, the application assembly 25 of the strip end on the mandrel 1 is advantageously mounted, with possibility of movement, between the upper arms 22, by means of two support carriages 31 guided in rails in an arc 32, provided on the corresponding faces of the upper arms 22, by means of rollers 33, one at least said carriages 31 being actuated in displacement by means of a cylinder 34 (Figure 2). This embodiment allows, by application of the assembly 25 on the new mandrel 1, to start the winding of the strip on said new mandrel 1, by movement of the carriages 1 in the position shown in broken line at the end in FIG. 3, in order to insert the beginning of strip between the parallel elastic belts 9 of the first pivoting means 2 and the new mandrel 1, then, by a circular arc movement of the assembly 25 in opposite direction, to ensure perfect winding of the first turn by accompanying said start of the strip on at least one turn, without application of glue on said new mandrel 1.

In order to guarantee a perfect passage from the beginning of the strip to the exit of the first pivoting means 2, and in particular pivoting teeth 16, towards the assembly 25, the second pivoting means 4 is advantageously provided, between the support carriages 31, at regular intervals, with staggered arrangement by relative to the teeth 16, of longitudinal guide claws 35, the end of which facing the teeth 16 moves away from the mandrel 1. For this purpose, the shafts 27 of guide of the elastic belts 26 are advantageously constituted by a plurality of short rollers mounted on a rotating guide axis simultaneously forming a support for the longitudinal guide claws 35. By application, at the beginning of the winding of the end of the strip on the new mandrel 1, these claws 35 are inserted between the teeth 16 and ensure the continuity of the passage and application of said end of strip on said chuck 1.

According to another characteristic of the invention, the rails of guiding in an arc of a circle 32 are advantageously provided, on their turned side outwardly of the arms 22, of a rack 36 meshing with a pinion corresponding 37 guided on the carriage 31, the pinions 37 of the two carriages 31 of support of the assembly 25 being interconnected by a rigid shaft. So it is possible to provide only a single actuator 34 for actuating a carriage 31, the actuation of this single carriage 31 having the effect, by meshing of the pinion 37 corresponding with the rack 36, to rotate corresponding to the pinion 37 of the other carriage 31 and, thus, by meshing with the corresponding rack 36, synchronous drive and displacement of said other carriage 31.

According to another characteristic of the invention, each arm upper 22 is provided at its free end 24 in the form of a hook with a stop 38 intended to cooperate with an adjustable stop 39 provided on the arms 5 of the first pivoting means 2. The contact between these two stops corresponds to the strip cross-sectional position, in which the anvils 20 and 21 tighten said strip for cutting by the knife 8.

Furthermore, the second pivoting means 4 is provided, between the hook-shaped ends in an arc 24 of the arms 22, of a roller transverse 40 for deflecting the strip to be cut and wound. This roll 40 is especially intended to bring the strip to be cut into its position pinching by anvils 20 and 21.

The device for cutting and applying the start of a strip new coil on a reel mandrel works as follows:

As soon as a reel to be wound is full, the operator, who has previously mounted a new non-glued mandrel 1, initiates the procedure cutting the strip and applying the end to the new mandrel 1. The drive of the full reel is stopped and the first pivoting means 2 is then tilted by means of the jacks 11 in its position shown in the Figure 1, in which the first set of elastic belts 9 is applied in an arc of circle around the mandrel 1 and the second pivoting means 4 is tilted by via the jacks 23, also in the position shown in FIG. 1. By this tilting of the second pivoting means 4, the strip is deflected by the roller 40 and is brought between the anvils 20 and 21. The cutting knife transverse 8 is then actuated, then the assembly 25 is moved by the carriages 31 actuated by the cylinder 34 and moving in synchronism thanks to the pinion 37 meshing with the racks 36 of the guide rails 32, in order to bring the cut end of the strip between the end of the belts 9 and the new chuck 1.

The training of the latter is then triggered and the assembly 25 is moved in opposite direction, so as to bring the longitudinal guide claws between the teeth 16 and to ensure continuity of the application of the strip on the mandrel 1. This application with pressure via belts 9 and 26 ensures a drive of the strip by the mandrel 1 without bonding the end of bandaged. After winding a few turns, the pivoting means 2 and 4 are actuated in the direction of a return to their rest position shown in the Figure 2 and the winding of the new coil is continued in the usual way.

The progress of the various operations can be controlled by a programmable controller or the like, so the operator only needs to set up the new mandrel and integrate the different parameters winding, namely the length of the wound strip or the reel diameter, etc. In known manner, during the cutting operation, the strip to be wound is stored in a tape accumulator provided upstream.

Thanks to the invention, it is possible to make a cut and a perfect application of the start of a strip to be wound on a new mandrel, without bonding, in particular in the case of winding fragile materials.

Of course, the invention is not limited to the embodiment describes and shows in the accompanying drawings. Modifications are still possible, in particular from the point of view of the constitution of the various elements or by substitution of technical equivalents, without departing from the scope of protection of the invention.

Claims (12)

1. Device for the cutting and gluelessly applying the web leading end for a new web roll onto the core (1) of a winder, essentially consisting of a first pivoting means (2) of cutting the strip (3) to be coiled and of application of the end of the latter onto a new core (1), without prior gluing of the latter, and of a second pivoting means (4) of introduction, after cutting, of the end of the strip (3) into the first pivoting means (2) for the application of the said strip (3) onto the new core (1), characterised by the fact that the first pivoting means (2) includes a cross-bar (7) supporting transverse cutting blade (8) presented in the form of a carrier guided along the cross-bar (7), operated by an actuator and working in conjunction with a transverse anvil (20) also extending between arms (5) forming a pivoting frame to constitute the first pivoting means (2), the said anvil (20) forming a stop for a similar anvil (21) fixed to the corresponding end of the second pivoting means (4), the cutting plane of the blade (8) preferably being situated close to the axis of a fixed lower shaft (10) for the guidance and support of a first set of parallel elastic belts (9), the second pivoting means (4) including an assembly (25) for the application of the end of the strip onto the core (1) extending between arms (22) mounted in pivoting fashion on the frame (6) of the decoiling machine.
2. Device according to claim 1, characterised by the fact that the parallel elastic belts (9) are preferably mounted on three shafts arranged in parallel in such a way as to form a triangle in vertical section, one of whose sides formed by the belts (9) is elastically deformable by being pressed against the core (1) and one of whose tops, formed by one of the shafts (10), can be moved by a pivoting action, by means of a pair of arms (12), and that they are loaded, in the rest position, by a pre-tensioning device consisting of a roll or a shaft (13) mounted in pivoting fashion on the frame formed by the arms (5) by means of pivoting levers (14), the said levers being loaded by return springs tending to pull the belts (9) between the two fixed shafts (10) in the direction of the new core (1).
3. Device according to either of claims 1 or 2, characterised by the fact that teeth (16) are positioned at regular intervals on a shaft (17) extending between the arms (5) close to their free end, in other words close to the bearings of the fixed shaft (10) which are furthest out in relation to the pivoting arms (5), the ends of the said teeth (16) overlapping the free ends of the arms (5), and extending in pivoting fashion towards the core (1) and inwards in relation to the circular arc cut (15), these pivoting teeth (16) being loaded at their other end by return springs (18) and pressing against stops (19), the return springs and the stops being mounted on cross-bars connecting the arms (5).
4. Device according to claim 1, characterised by the fact that the assembly (25) for the application of the end of the strip onto the core (1) is mounted, with the possibility of movement, between the upper arms (22) by means of two supporting carriers (31) guided along rails in the arc of a circle (32) provided on the corresponding faces of the upper arms (22), by means of rollers (33), at least one of the said carriers (31) having its movement operated by an actuator (34).
5. Device according to either of claims 1 or 4, characterised by the fact that the assembly (25) for the application of the end of the strip onto the core (1) consists of a second set of parallel endless elastic belts (26), mounted on at least two parallel shafts (27) extending between the upper arms (22) and guided on the supporting carriers (31).
6. Device according to either of claims 4 or 5, characterised by the fact that the parallel elastic belts (26) are mounted on three parallel shafts (27) forming a triangle of variable section, one of whose sides formed by the belts (26) is elastically deformable by being pressed against the core (1), and one of whose tops, formed by one of the shafts (27), can be moved by pivoting, by means of a pair of arms (28).
7. Device according to either of claims 5 or 6, characterised by the fact that the parallel elastic belts (26) are loaded, in the rest position, by a pre-tensioning device consisting of a roll or a shaft (29) mounted in pivoting fashion between the upper arms (22) by means of pivoting levers (30), the said levers being loaded by return springs tending to pull the belts (26) between the two fixed shafts (27) in the direction of the new core (1).
8. Device according to any of claims 1 and 3 to 5, characterised by the fact that, in order to guarantee a perfect passage of he start of the belt from the exit of the first pivoting means (2), and in particular from the pivoting teeth (16) towards the assembly (25), and that the second pivoting means (4) are provided, between the supporting carriers (31), at regular intervals, in a staggered arrangement in relation [to the] supports (31), at regular intervals, in a staggered arrangement in relation to the pivoting teeth (16), with longitudinal guidance claws (35), of which the end turned towards the pivoting teeth (16) points away from the core (1).
9. Device according to claim 8, characterised by the fact that the guide shafts (27) of the elastic belts (26) consist of a number of short rollers mounted on a rotating guide spindle which simultaneously forms a support for the longitudinal guidance claws (35).
10. Device according to claim 4, characterised by the fact that the circular arc guide rails (32) are provided, on their side facing the outside of the arms (22), with a rack (36) engaging with a corresponding pinion (37) guided along the carrier (31), the pinions (37) of the two carriers (31) which support the assembly (25) being connected to each other by a rigid shaft.
11. Device according to any of claims 1, 4, 5 or 7, characterised by the fact that each upper arm (22) is provided at its hook-shaped free end (24), with a stop (38) designed to work in conjunction with an adjustable stop (39) provided on the arms (5) of the first pivoting means (2).
12. Device according to any of claims 1, 3 to 5, 7 or 10, characterised by the fact that the second pivoting means (4) are provided, between the circular arc hook-shaped ends (24) of the arms (22), with a transverse roll (40) for deflection of the strip to be cut and to be coiled.

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