EP0619255B1 - Device for cutting and attaching the leading end of a web of a new roll onto a core of a winder - Google Patents

Description

The present invention relates to the field of machines for winding strip materials for making of coils and relates to a cutting device and applying the tape start of a new reel on a reel mandrel.

Tape winding by means of machines coiling generally causes the problem, on the one hand, of cutting the tape and, secondly, the application correct end of the strip on the mandrel after the cup.

To this end, it may be proposed to carry out cutting while the strip runs along a principle called cutting on the fly, in which a knife is projected in the course of the strip and the end cut from the strip is projected onto a mandrel beforehand glued or fitted with one or more adhesive tapes receiving said end, which is clamped in further on said mandrel by the strip during its winding.

Such a cut while the tape allows a significant yield, practically without slower web speed when cutting.

However, in the case of tape winding in relatively brittle materials, a cut to the fly compromises the good behavior of the cut end which can eventually be damaged over a relatively long important, even tend to provoke a break in the tape at a certain distance from the place cutting, which can lead to poor winding, or even a winding fault, the strip no longer even applied to the new mandrel or with a flap.

It was also proposed to make the cut, after stopping the winding of the full reel, manually, the tape to be wound up being stored in a accumulator. In such a case, the cut is performed manually by two their opera house, one of which holds the end of the cut strip while the other sticks the new mandrel, then apply said end to said new mandrel, the start of which is controlled by one of the two operators. Such an embodiment requires however operator intervention in a machine running, which necessarily entails a risk of accident. On the other hand, the fact that the intervention is carried out manually, it is necessary to provide an accumulator large, especially in the case winding at high speeds, to make up for everything risk of exceeding the cutting and connection time outsourced. In addition, the connection of the tape start on the new mandrel is necessarily made so random, since this is done relatively hastily.

Furthermore, US-A-4,099,435 describes a device cutting, essentially constituted by a means of cut cooperating with a means of tightening the strip said cutting means in the form of a box housing and guiding a cutting knife bandaged.

In addition, GB-A-1 297 812 and CH-A-567 999 have for object a cutting means comprising a movable knife transverse to the strip and to the direction of strip running, the strip being held for cutting by a clamping means preventing its displacement.

However, none of these documents provides or does suggest a simple way of tightening the band at the level of the cut, preventing any deterioration of said strip when cutting, by perfectly parallel pinching. In addition, the known devices are not applicable to reels of the rotary disc type of spool holder support.

The object of the present invention is to overcome these disadvantages by proposing a device according to the preamble of claim 1, which allows a perfect cut strips of all types, in particular material strips relatively brittle.

To this end, the invention relates to a device cutting and applying the start of a strip new coil on a reel core, in which rotating spool support discs are mounted on a chassis, essentially a device constituted by a cutting means cooperating with a band tightening means and by application means an adhesive strip or the like on the end cut from the tape and pressure and application of the latter and adhesive tape on the mandrel the new reel, the cutting means being under shape of a housing and guiding a knife, this box being movable transversely to the tape running direction, characterized device in that the cooperating band tightening means with the cutting means is formed in the form of a transverse counterpart plate provided with a slot intended to cooperate with the end of the knife of the means cutting, said counterpart plate being mounted at the end of the arm, pivoting around the axis of the discs for supporting the reel-holder and actuated reel shafts pivoting by means of synchronized cylinders.

la figure 1 est une vue en élévation latérale du dispositif conforme à l'invention monté sur un enrouleur ;

la figure 2 est une vue en élévation latérale et en coupe à plus grande échelle du dispositif ;

la figure 3 est une vue en élévation latérale et en coupe à échelle agrandie du moyen de coupe ;

la figure 4 est une vue en coupe et en plan du moyen de coupe, et

la figure 5 est une vue en plan du dispositif en position de préparation du joint.

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

Figure 1 is a side elevational view of the device according to the invention mounted on a reel;

Figure 2 is a side elevational view in section on a larger scale of the device;

Figure 3 is a side elevational view in section on an enlarged scale of the cutting means;

FIG. 4 is a sectional and plan view of the cutting means, and

Figure 5 is a plan view of the device in the joint preparation position.

The cutting and application device from the start tape of a new coil on a mandrel 1 of a reel 2 is essentially constituted by a means of section 3 cooperating with a means 4 for tightening the strip and by a means 5 for applying an adhesive tape or analog 6 on the cut end of the tape and pressure and applying the latter and the tape adhesive on the mandrel 1 of the new coil.

The cutting means 3 (Figures 2 to 4) is presented in the form of a box 7 for housing and guiding a knife 8 movable in a slot 8 ', said box being mounted on a frame 9 for guiding the strip, arranged with possibility of tilting, under the action of a cylinder 10, in the chassis 11 of the reel 2, said box 7 being movable transversely to the direction the tape running, its face carrying the slot 8 'being turned towards said strip.

The box 7 is mounted by its ends in the chassis 9 by means of end guide slides 12, cooperating by guide rollers 13 with guide rails of said chassis 9 and is actuated in displacement, transverse to the direction of travel of the strip, by means of jacks 14 resting on the face of said box 7 opposite to that of the knife guide 8, said jacks 14 being mounted on a bar of support 15 of chassis 9.

The knife 8 is mounted on a guided carriage 16, by means of rollers 17, in a rail 18 formed in the box 7 on either side of the slot 8 ', said carriage 16 being actuated in longitudinal displacement in the box 7 by means of a rodless cylinder 19. Such a method of mounting the carriage 16 allows guidance perfect of the latter, without risk of deflection of the knife 8, the carriage 16 being connected directly to the piston rodless cylinder 19. Indeed, such a cylinder provides a perfect precision of the movement of the carriage 16 and therefore of knife 8 with a relatively power installation low.

In addition, the box 7 is provided with two covers 8 '' end, mounted in an adjustable position, above the slot 8 'and intended to cover the knife 8 in its extreme positions.

The means 4 for tightening the cooperating strip with the cutting means 3 is formed in the form of a transverse counterpart plate 20 provided with a slot 21 intended to cooperate with the end of the knife 8 of the cutting means 3, said plate 20 being mounted at the end of the arm 22, pivoting around the axis of the discs 23 supporting the reel holder shafts 24 of the reel and pivoted by means of synchronized cylinders 25.

The chassis 9, which can be tilted under the action of the jack 10 and provided with rollers 9 'for returning the band, is pivotally mounted around the 9 '' axis of one of these deflection rollers 9 'between a retracted position of preparation of the means 5 for applying the adhesive tape or the like 6, having the cutting means 3 in a horizontal position, the knife 8 turned upwards, and a position for cutting and applying the end of strip cut substantially vertically, in a plane tangent to the generator described by the axes of the trees reel holder 24 mounted on the discs 23 of the reel 2 (Figure 2).

According to a characteristic of the invention, the reel advantageously comprises a number of means for tightening 4 equal to that of the reel-holder shafts 24. The mounting of the pivoting arms 22 on the disc axis 23 allows, during the strip cutting operation, to bring the transverse counterpart plate 20 of the means 4 band tightening in a perfectly position tangential to the running plane of said strip, in face of the cutting means 3.

In accordance with another characteristic of the invention and as shown in Figure 2, the chassis 9 is further provided with means 26 for locking the strip during the cutting and application operation on the mandrel of the new coil, this means 26 cooperating with a deflection roller 9 '.

The locking means 26 preferably consists of by a crossbar 27 mounted so movable in a plane passing through the axis of the roller 9 ' corresponding, via at least one jack actuation 28, and by a cross member 29 of the chassis 9 supporting said jack 28 and crossbar 27. Thus, by actuation of the jack (s) 28, the bar transverse 27 is forcibly applied against the roller 9 'corresponding and performs a blocking of the strip in movement.

According to another characteristic of the invention, not shown in the accompanying drawings, the housing 7 housing and guiding the knife 8 of the cutting means 3 is provided with centering and end of detection means race cooperating with means of corresponding shape provided on the ends of the support arms 22 of the counterpart plate 20 forming the clamping means 4. The centering and detection means can advantageously be formed in the form of frustoconical holes emerging at their base of restricted section on a limit switch and corresponding means, provided on the ends of the support arms 22 of the counterpart plate 20, then have a form of conical rod, the end of which cooperates in centering limit switch with limit switch means provided on the box 7.

This limit switch is intended, for a hand, to detect the cooperation between the cutting means 3 and the clamping means 4 and, on the other hand, the application effective of one against the other in order to authorize the cut of the strip by the knife 8 mounted on the carriage 16 and actuated by the rodless cylinder 19.

The means 5 for applying an adhesive tape or the like 6 on the cut end of the strip and pressure and application of the latter and of the strip adhesive on the mandrel 1 of the new coil is advantageously constituted by a vacuum cylinder 31 (Figures 2 and 5) having a perforated strip 32 of holding the adhesive strip 6 or the like by depression, said vacuum cylinder 31 being mounted so pivotable in the tilting frame 9 by means of arms 33 actuated by at least one jack 34.

According to a characteristic of the invention, the vacuum cylinder 31 is provided with at least one means indexing device 35 consisting of a caster 36 mounted on a pivoting lever 37 actuated by a jack 38, provided on a arm 33, and cooperating with recesses 39 of shape corresponding provided on the corresponding end of the vacuum cylinder 31 (Figure 2).

The recesses 39 are advantageously in number of two and are arranged at an angular distance corresponding to the linear distance between the median axis of the perforated strip 32 of the vacuum cylinder 31, in cutting position and tape application, and the slot 8 'of the box 7 of the cutting means 3. Thus, the strip adhesive or the like 6 can be applied to the tape perforated 32 of the vacuum cylinder 31 in a position for indexing said cylinder 31 corresponding to the position applying the end of the cut strip and adhesive tape on the mandrel 1, then said cylinder 31 is brought into the second indexing position, in which it is held by means of the jack 38 bringing the caster 36 by pivoting the lever 37 in the corresponding recess 39. This second position indexing position corresponds to a waiting position, in which the strip is cut by the knife 8 of the means section 3.

According to another characteristic of the invention and as shown in Figures 2 and 5 of the accompanying drawings, the box 7 of the cutting means 3 is advantageously provided with an intermediate guide plate 40 mounted pivoting on the casing 7 and extending in the direction of the vacuum cylinder 31 by partially covering the latter in position to prepare the medium 5 for applying the adhesive tape or the like 6, as well that in the strip cutting position, this plate 40 is moving, under the effect of the thrust of the vacuum cylinder 31 towards the mandrel 1 during the phase application of the end of the cut strip and the adhesive tape or the like 6 on said mandrel 1 and being returned to position by a spring 41.

During this application phase, the cylinder vacuum 31 is moved against the mandrel 1 via of the jack (s) 34 acting on the arms 33 support, so as to pivot the assembly around its axis of articulation.

A rotation of the support spool-holder shaft 24 of the mandrel 1 in the opposite direction to the winding direction will have the effect of moving the cylinder 31 in rotation, so as to bring it into a position corresponding to its first indexing position, i.e. where the adhesive strip 6 is facing the mandrel 1, and to be produced an additional rotation in this direction, in view full application of the adhesive tape on the mandrel 1 per ironing.

The device according to the invention works as follows :

At the end of the winding of a full reel, the disks 23 of the reel 2 are rotated so to bring a new mandrel 1 into the winding position, as shown in Figures 1 and 2 of the accompanying drawings.

During the winding of the previous reel, an operator will have brought the vacuum cylinder 31 into the preparation position of the chassis 9, that is to say in pivoted position so as to present the slot 8 'of the knife 8 facing upwards, in the first position indexing shown in Figure 5 of the accompanying drawings, in which the perforated strip 32 is also rotated upwards and extends in extension of the intermediate plate guide 40. In this position, the operator apply adhesive tape 6 above the perforations of strip 32 and triggers the suction inside of cylinder 31, so that said strip 6 is maintained, then it turns said cylinder 31 until bringing this one in its second indexing position, in which the roller 36 cooperates with the second recess 39.

The band tightening means 4 is pivoted, by means of the jacks 25, in its position of service, above the new mandrel 1 and the chassis 9 supporting the box 7 of the cutting means 3 is then pivoted, under the action of the jack 10, towards the position cutting and applying the strip on the mandrel 1.

Simultaneously, the box 7 is moved in its final position of service, in which its means centering and limit switch detection cooperate with the correspondingly shaped means provided on the ends of the arms 22 for supporting the counterpart plate 20 forming the clamping means 4 and the winding of the full reel is stopped, so the tape is ready to be cut by the knife 8. The contact thus detected by the corresponding means of the box 7 authorizes, prior to cutting, the triggering of the cutting under tension of the strip and preventing any running of it, the strip winding, during cutting, in known manner, on an accumulator 30 mounted in upstream of the reel 2. Such an accumulator 30 is known in itself and its operation is not described in detail.

The knife is then moved transversely to the strip of material to be cut by actuating its cylinder 19 driving its support carriage 16, being guided, on the one hand, in the slot 8 of the box 7 and, on the other hand hand, in slot 21 of the counterpart plate transverse 20 of the clamping means 4.

Then, the vacuum cylinder 31 is pivoted, by actuating its actuator (s) 34, against the new mandrel 1, in order to clamp the cut strip against the latter, then the reel-holder shaft 24 is put in slow rotation in opposite direction to the winding direction in view of bringing the vacuum cylinder 31 with the start of strip and the adhesive strip 6 opposite the new mandrel 1 and apply them on the latter by continuing this rotational movement for full application of the strip 6 on the mandrel 1, this application being strengthened by a consecutive movement back and forth in rotation, so as to iron the end thus produced on the new mandrel 1. The winding of the new coil can then start, the locking means 26 being released, the pivoting vacuum cylinder 31 in its starting position, the box 7 also being returned to its starting position, before tilting, also in the starting position, of the chassis 9 and the clamping means 4 tilting in its starting position by actuation of the arms 22 by means of the jacks 25.

Thanks to the invention it is possible to carry out a reel in which the cutting of the strip and the application from its start on a mandrel of a new coil are carried out in a perfect manner, i.e. without deterioration of the strip at the cut and without risk of folds forming at the start of the strip when the winding. Such a reel is particularly suitable for winding brittle materials.

Of course, the invention is not limited to embodiment described and shown in the accompanying drawings. Modifications remain possible, in particular from point of view of the constitution of the various elements or by substitution of technical equivalents, without going out provided the scope of protection of the invention.

Claims (13)

1. Device for cutting and attaching the start of the web of a new reel to a mandrel (1) of a winding machine (2), wherein rotary discs (23) for supporting reel-carrier shafts (24) are mounted on a frame (11), the device being constituted essentially by a cutting means (3) co-operating with a clamping means (4) for the web and by a means (5) for applying an adhesive strip or the like (6) to the cut end of the web and for pressing and applying the latter and the adhesive strip (6) to the mandrel (1) of the new reel, the cutting means (3) being in the form of a casing (7) for housing and guiding a knife (8), the casing being displaceable transversely to the direction of unwinding of the web, which device is characterised in that the clamping means (4) for the web, co-operating with the cutting means (3), is constituted in the form of a transverse complementary plate (20) provided with a slot (21) intended to co-operate with the end of the knife (8) of the cutting means (3), the said complementary plate (20) being mounted at the end of arms (22), pivoting about the axis of the support discs (23) for the reel-carrier shafts (24) of the winding machine (2) and actuated in a pivoting movement by means of synchronised pressure cylinders (25).
2. Device according to Claim 1, characterised in that the casing (7) is mounted on a frame (9) for guiding the web, arranged with a possibility of tilting, under the action of a pressure cylinder (10), in the frame (11) of the winding machine (2).
3. Device according to Claim 2, characterised in that the casing (7) is mounted by its ends in the guide frame (9) by means of end guiding slides (12), co-operating by means of small guide wheels (13) with guide rails of the said frame (9) and is actuated in displacement, transversely to the direction of unwinding of the web, by means of pressure cylinders (14) bearing on the opposite face of the said casing (7) from that guiding the knife (8), the said pressure cylinders (14) being mounted on a support bar (15) of the guide frame (9).
4. Device according to any one of Claims 1 to 3, characterised in that the guide frame (9), being able to be tilted by the action of the pressure cylinder (10) and equipped with web return rollers (9'), is pivotally mounted about the axis (9'') of one of the return rollers (9') between a retracted position for preparation of the means (5) for applying the adhesive strip or the like (6), presenting the cutting means (3) in a horizontal position, with the knife (8) turned upwards, and a position for cutting and attaching the cut end of the web substantially in the vertical, in a plane tangential to the generatrix described by the axes of the reel-carrier shafts (24) mounted on the discs (23) of the winding machine (2).
5. Device according to either of Claims 1 and 4, characterised in that the winding machine (2) has a number of clamping means (4) equal to the number of reel-carrier shafts (24).
6. Device according to any one of Claims 1, 2 and 4, characterised in that the guide frame (9) is additionally provided with a means (26) for locking the web during the operation of cutting and attaching to the mandrel of the new reel, the means (26) co-operating with a return roller (9').
7. Device according to Claim 6, characterised in that the locking means (26) is preferably constituted by a transverse bar (27) mounted so as to be displaceable in a plane passing through the axis of the corresponding roller (9'), by way of at least one actuating pressure cylinder (28), and by a cross-member (29) of the guide frame 9 supporting the said pressure cylinder (28) and transverse bar (27).
8. Device according to any one of Claims 1 to 4, characterised in that the casing (7) for housing and guiding the knife (8) of the cutting means (3) is provided with centring and end of stroke detecting means co-operating with means of corresponding shape provided on the ends of the support arms (22) for the complementary plate (20) forming the clamping means (4).
9. Device according to Claim 8, characterised in that the centring and detecting means are constituted in the form of frustoconical bores opening at their base of restricted section onto an end of stroke contact and the means of corresponding shape, provided on the ends of the support arms (22) for the complementary plate (20), then have a conical gauge shape, the end of which co-operates at the end of the centring stroke with the end of stroke contact of the means provided on the casing (7).
10. Device according to any one of Claims 1, 3, 4, 6 and 7, characterised in that the means (5) for applying an adhesive strip or the like (6) to the cut end of the web and for pressing and applying the latter and the adhesive strip to the mandrel (1) of the new reel, which means is constituted by a low pressure cylinder (31) having a perforated strip (32) for holding the adhesive strip (6) or the like by means of low pressure, is pivotally mounted in the tilting frame (9) by means of arms (33) actuated by at least one pressure cylinder (34).
11. Device according to Claim 10, characterised in that the low pressure cylinder (31) is provided with at least one indexing means (35) consisting of a small wheel (36) mounted on a pivoted lever (37) actuated by a pressure cylinder (38), provided on an arm (33), and co-operating with recesses (39) of corresponding shape provided on the corresponding end of the low pressure cylinder (31).
12. Device according to any one of Claims 1 and 11, characterised in that the recesses (39) are two in number and are arranged at an angular distance corresponding to the linear distance between the median axis of the perforated strip (32) of the low pressure cylinder (31), in the position for cutting and attaching the web, and the slot (8') of the casing (7) of the cutting means (3).
13. Device according to any one of Claims 1 to 3, 8 and 9 to 12, characterised in that the casing (7) of the cutting means (3) is advantageously provided with an intermediate guide plate (40) pivotally mounted on the casing (7) and extending in the direction of the low pressure cylinder (31), partially overlapping the latter in the position for preparation of the means (5) for applying the adhesive strip or the like (6), as well as in the position for cutting the web, the plate (40) moving, under the effect of the thrust of the low pressure cylinder (31), in the direction of the mandrel (1) during the stage of attaching the end of the cut web and the adhesive strip or the like (6) to the said mandrel (1) and being pulled back into position by a spring (41).

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