EP0699610A1 - Device for cutting and gluelessly applying the web leading end for a new web roll onto the core of a winder - Google Patents

Abstract

The beginning of a cut band is wound onto the mandrel (1) of a new reel without previous gluing of the mandrel by a first pivoting system (2). A second pivoting system (4) introduces the band, after cutting, into the first pivoting system. The first pivoting system comprises a pivoting chassis formed by a pair of parallel arms (5) extending near the ends of the winding machine frame (6). These arms are connected by a cross member (7) supporting the transverse cutter (8) and activated by an actuator (11) and a flexible belt assembly (9). The parallel belts are mounted on three parallel shafts so as to form a vertical triangular section. One of the sides formed by the belts is deformable by application against the mandrel and one of the vertices formed by one of the shafts can be pivoted by means of a pair of arms.

Description

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

The winding of strips by means of winding machines generally poses 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 on the mandrel after the cup. For this purpose, it is possible to make the cut during the running of the strip according to a principle called cutting on the fly, in which a knife is projected in the path of the strip and the cut end of the strip is projected on a mandrel previously glued or provided with one or more adhesive strips for receiving said end, which is further tightened on said mandrel by the strip during its winding.

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

However, in the case of winding strips of relatively friable materials, such as mica films, plating, or the like, cutting on the fly compromises the good performance of the cut end which may possibly be damaged on a relatively long length, or even have a tendency to cause the strip to break at a certain distance from the place of the cut, which can lead to poor winding, or even a winding defect, the strip not even being applied any more on the new mandrel or with a flap.

It is also known to make the cut when stopped, that is to say the full reel being stopped after winding, the strip to be wound is then temporarily stored in an accumulator disposed upstream of the winding machine.

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 glues the new mandrel, then applies said end to said new mandrel, the start of which is controlled by one of the two operators. Such an embodiment requires, however, an intervention of the operators in a running machine, 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 simply pinching the first wound turns, with a view to their subsequent transformation. Such a winding is particularly difficult to achieve, avoiding any risk of slipping when starting the winding in the case of winding relatively rigid materials.

GB-A-1 154 662 also discloses a device for cutting strips and winding 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 cutting action of the strip having the effect, in the continuation of the movement of the knife, of bringing the beginning of the strip in a corner formed for this purpose to the corresponding part of the shell.

Furthermore, this document GB-A-1 154 662 describes a first pivoting means partially surrounding the new mandrel and a second pivoting means for cutting the strip to be wound. This second pivoting means 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 effect the introduction of the start 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 the event of winding of a particularly flexible material, the air blowing combined with a rapid rotation may not be of sufficient efficiency to avoid folding of the tips of the teeth.

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

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

This device does not, however, in any way 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. In fact, no mobile means are provided which tend to follow the movement of the end of the strip to be wound.

Finally, US-A-4 326 679 discloses a device for cutting a strip and applying its end to a new mandrel, this device using lateral means for applying the strip to a large part. of the circumference of the new mandrel, as well as a means of cutting said strip.

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

The present invention aims to overcome these drawbacks by proposing a cutting and application device making it possible to surround a new mandrel over the greater part of its periphery in order to favor the winding of a strip start following a section of said strip, this section being a straight, frank and not serrated section.

It has, in effect, a device for cutting and applying, without glue, the start of the strip of a new reel on a mandrel of a reel, essentially constituted by a first pivoting means of cutting the strip to winding and applying the end of the latter onto a new mandrel, without prior gluing of the latter, and by a second pivoting means for introducing, after cutting, the end of the strip into the first pivoting means and application of said strip on the new mandrel, characterized in that the first pivoting means comprises a cross member for supporting a knife of transverse section 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 a similar anvil fixed to the corresponding end nte of the second pivoting means, the cutting plane of the knife being preferably located near the axis of a fixed lower shaft for guiding and supporting a first train of parallel elastic belts and in that the second pivoting means comprises a set applying the end of the strip to the mandrel extending between arms pivotally mounted on the chassis of the unwinding machine.

• 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 FIGS. 1 to 3 of the appended drawings, the device for cutting and applying, without glue, the start of the strip of a new reel on a mandrel 1 of a reel consists essentially of a first pivoting means 2 cutting the strip 3 to be wound 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 of applying said strip 3 to 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 for supporting a cutting knife transverse 8 and each actuated by a jack 11 and by a first train of parallel elastic belts 9, endless, mounted on at least one 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 shafts arranged in parallel so as to form a vertical section in a triangle, one of the sides formed by the belts 9 is elastically deformable by application against the mandrel 1 and whose one of the vertices, formed by one of the shafts 10, is displaceable by pivoting, by means of a pair of arms 12, represented in FIG. 3 by a simple axis line. Thus, during the pivoting of the arms 5 carrying the shafts 10 with the belts 9 and of the application of said belts 9 on the mandrel 1, there is a tension of the belts 9 due at 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 parallel elastic belts 9 are loaded, in the rest position, by a prior tensioning device constituted by a roller or a shaft 13 pivotally mounted on the frame formed by the arms 5 by the intermediate pivot levers 14, represented in FIG. 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 cutout in a portion of a circle 15 extending between the bearings of the two fixed shafts 10 for supporting the belts 9. Thus, a passage for the mandrel 1 is cleared on the arms 5 allowing perfectly the 'application of the belts on said mandrel 1 without risk of contacting the arms 5 with the ends of the mandrel 1 or with the support hubs of the latter.

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 outermost with respect to the pivoting arms 5, the ends of said teeth 16 projecting from the free ends of the arms 5 and extending in pivoting towards the mandrel 1 inwards relative to the cutting into a portion of a circle 15, these pivoting teeth 16 being loaded at their other end by return springs 18 and abutting 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 intimately apply the end of the strip to be wound on the mandrel 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 an anvil analog 21 fixed to the corresponding end of the second pivoting means 4, the cutting plane of the knife 8 being preferably located near the axis of the fixed fixed shaft 10 for guiding and supporting the first train of parallel elastic belts 9 (figure 3).

The second pivoting means 4 is constituted by two upper parallel arms 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 the shape of a hook in an arc 24, and by a set 25 for applying the strip end to 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, endless, mounted on at least two pairs of parallel shafts 27 extending between the upper arms 22.

The parallel elastic belts 26 are preferably mounted on three parallel shafts 27 forming a triangle of variable section, one of the sides formed by the belts 26 is elastically deformable by application against the mandrel 1 and one of the vertices , formed by one of the shafts 27, is displaceable by pivoting, by means of a pair of arms 28 (represented by their center line in FIG. 3). Furthermore, the parallel elastic belts 26 are loaded, in the rest position, by a prior tensioning device constituted by a roller or a shaft 29 pivotally mounted between the upper arms 22 by means of pivoting levers 30, shown by their center line in FIG. 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 in FIG. 3 of the accompanying drawings, the assembly 25 for applying the strip end to the mandrel 1 is advantageously mounted, with the possibility of displacement, 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, at least one of said carriages 31 being actuated in displacement by means of a jack 34 (FIG. 2). This embodiment allows, by applying the assembly 25 to the new mandrel 1, to start the winding of the strip on said new mandrel 1, by moving the carriages 1 in the position shown in phantom in fine in Figure 3 , in order to carry out the insertion of the beginning of the strip between the parallel elastic belts 9 of the first pivoting means 2 and the new mandrel 1, then, by a movement in an arc of a circle of the assembly 25 in opposite directions, to ensure perfect winding of the first turn by accompanying said start of the strip on at least one turn, without applying adhesive to said new mandrel 1.

In order to guarantee perfect passage of the start of the strip from the outlet of the first pivoting means 2, and in particular of the 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 relative to the teeth 16, longitudinal guide claws 35, the end of which faces the teeth 16 departs from the mandrel 1. To this end, the shafts 27 for guiding the elastic belts 26 are advantageously constituted by a plurality of short rollers mounted on a guiding axis in rotation 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 mandrel 1.

According to another characteristic of the invention, the guide rails in an arc of a circle 32 are advantageously provided, on their face turned towards the outside of the arms 22, with a rack 36 meshing with a corresponding pinion 37 guided on the carriage 31, the pinions 37 of the two carriages 31 for supporting the assembly 25 being interconnected by a rigid shaft. Thus, 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 corresponding pinion 37 with the rack 36, to cause a corresponding rotation of the pinion 37 of the other carriage 31 and, thus, by meshing with the corresponding rack 36, a synchronous drive and displacement of said other carriage 31.

According to another characteristic of the invention, each upper arm 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 cross-sectional position of the strip, in which the anvils 20 and 21 clamp 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, with a transverse roller 40 for deflecting the strip to be cut and wound. This roller 40 is very particularly intended to bring the strip to be cut into its pinching position by the anvils 20 and 21.

The device for cutting and applying the start of the strip from a new reel to a mandrel of a winder works as follows:

As soon as a reel to be wound up is full, the operator, who has previously mounted a new unglued mandrel 1, initiates the procedure cutting the strip and applying the end to the new mandrel 1. The driving 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 FIG. 1, in which the first train of elastic belts 9 is applied in an arc of a circle around the mandrel 1 and the second pivoting means 4 is tilted by means of the jacks 23, also in the position represented 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 transverse cutting knife 8 is then actuated, then the assembly 25 is moved by the carriages 31 actuated by the cylinder 34 and moving in synchronism with 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 mandr in 1.

The drive of the latter is then triggered and the assembly 25 is moved in the opposite direction, so as to bring the longitudinal guide claws between the teeth 16 and to ensure continuity of application of the strip on the mandrel 1 This pressure application via the belts 9 and 26 ensures that the strip is driven by the mandrel 1 without bonding of the end of the strip. 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 Figure 2 and the winding of the new coil is continued in the usual way.

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

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

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

Claims (12)

Device for cutting and applying, without glue, the beginning of the strip of a new reel to a mandrel (1) of a reel, essentially constituted by a first pivoting means (2) for cutting the strip (3) to wind and apply 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 applying said strip (3) to the new mandrel (1), characterized in that the first pivoting means (2) comprises a crosspiece (7) for supporting a cross-cut knife (8) in the form of a carriage guided on the cross-member (7) and actuated by a jack and cooperating with a transverse anvil (20) also extending between arms (5) forming a frame pivoting constituting the first pivoting means (2), said anvil (20) forming a stop for an analogous anvil eu (21) fixed to the corresponding end of the second pivoting means (4), the cutting plane of the knife (8) being preferably located near the axis of a fixed lower shaft (10) for guide and support a first train of parallel elastic belts (9) and in that the second pivoting means (4) comprises an assembly (25) for applying the end of the strip to the mandrel (1) extending between arms (22) pivotally mounted on the chassis 6 of the unwinding machine. Device according to claim 1, characterized in that the parallel elastic belts (9) are preferably mounted on three shafts arranged in parallel so as to form a vertical section in a triangle, one of the sides of which is formed by the belts ( 9) is elastically deformable by application against the mandrel (1) and one of the vertices of which, formed by one of the shafts (10), is displaceable by pivoting, by means of a pair of arms (12) and in that they are loaded, in the rest position, by a prior tensioning device constituted by a roller or a shaft (13) pivotally mounted on the frame formed by the arms (5) by means of levers pivot (14), said levers being loaded by return springs tending to tension the belts (9) between the two fixed shafts (10) in the direction of the new mandrel (1). Device according to either of Claims 1 and 2, characterized in that teeth (16) are arranged at regular intervals on a shaft (17) extending between the arms (5) near their free end, c ' is to say proximity of the bearings of the outermost fixed shaft (10) relative to the pivoting arms (5), the ends of said teeth (16) projecting beyond the free ends of the arms (5) and extending in pivoting 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 return springs (18) and coming into abutment against stops (19 ), the return springs and the stops being mounted on crosspieces connecting the arms (5). Device according to claim 1, characterized in that the assembly (25) for applying the end of the strip to the mandrel (1) is mounted, with the possibility of displacement, between the upper arms (22), by means 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), at least one of said carriages ( 31) being actuated in displacement by means of a jack (34). Device according to either of Claims 1 and 4, characterized in that the assembly (25) for applying the strip end to the mandrel (1) consists of a second train of parallel elastic belts (26 ), endless, mounted on at least two parallel shafts (27) extending between the upper arms (22) and guided on the support carriages (31). Device according to any one of claims 4 and 5, characterized in that the parallel elastic belts (26) are mounted on three parallel shafts (27) forming a triangle with variable section, one of the sides formed by the belts (26) is elastically deformable by application against the mandrel (1) and one of the vertices of which, formed by one of the shafts (27), is displaceable by pivoting, by means of a pair of arms (28 ). Device according to either of Claims 5 and 6, characterized in that the parallel elastic belts (26) are loaded, in the rest position, by a pre-tensioning device constituted by a roller or a shaft (29) mounted pivotally between the upper arms (22) by means of pivoting levers (30), said levers being loaded by return springs tending to tension the belts (26) between the two fixed shafts (27) in the direction of the new mandrel (1). Device according to any one of Claims 1 and 3 to 5, characterized in that, in order to guarantee perfect passage of the start of the strip from the outlet of the first pivoting means (2), and in particular of the pivoting teeth (16) , towards the assembly (25), the second pivoting means (4) is provided, between the support carriages (31), at regular intervals, with staggered arrangement relative to supports (31), at regular intervals, with staggered arrangement with respect to the pivoting teeth (16), of longitudinal guide claws (35), the end of which faces the pivoting teeth (16) deviates from the mandrel (1 ). Device according to claim 8, characterized in that the shafts (27) for guiding the elastic belts (26) consist of a plurality of short rollers mounted on a guiding axis in rotation simultaneously forming a support for the longitudinal claws guide (35). Device according to claim 4, characterized in that the guide rails in a circular arc (32) are provided, on their face turned towards the outside of the arms (22), with a rack (36) meshing with a pinion corresponding (37) guided on the carriage (31), the pinions (37) of the two carriages (31) supporting the assembly (25) being interconnected by a rigid shaft. Device according to any one of claims 1, 4, 5 and 7, characterized in that each upper arm (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). Device according to any one of Claims 1, 3 to 5, 7 and 10 characterized in that the second pivoting means (4) is provided, between the hook-shaped ends in an arc (24) of the arms (22 ), a transverse roller (40) for deflecting the strip to be cut and wound.

Images