FR3109377A1 - Device for laying a material in the form of a strip at a corner - Google Patents

Abstract

The present invention relates to a device (1) comprising a means (6) for supporting and progressively unwinding a roll (2 ') of flexible material in strip (2), a means (7) for front guide and application of the strip of material (2) in the edge (3 ') of a corner (3), and at least one means (8) of return of the strip of material (2) moving between the roller (2 ') and the means (7), these means (6, 7, 8) being mounted together on a frame forming a common support structure of the device (1) and provided at least one handling member (10). This device (1) is characterized in that it also comprises a means (for marouflage carrying out, during the movement during a laying operation, a surface application of each of the two longitudinal sides of the strip of material (2) , located on either side of a fold (2 '') formed by the means (7), respectively against one of the abutting surface bands of the two surfaces (5 and 5 '), located on either side of the edge (3 '), this by sliding linear pressure Figure to be published with the abstract: Fig.12

Description

Device for laying a material in the form of a strip at the level of a corner

The present invention relates to the field of equipment for public works, construction or the like, in particular covering or sealing work at the corners formed between two perpendicular surfaces, for example a flat roof with a peripheral rim (type parapet), and relates to a device for laying a strip of flexible material at such an elongated and profiled corner.

The application of a thin strip material of the sheet, film, felt, veil or similar type is common practice in the field of building and construction in general, for example for the purpose of applying a layer sealing whose strip material constitutes the reinforcing or reinforcing layer.

This strip material can be put in place after an adhesive layer has been applied to both surfaces, along the corner. Alternatively, the web material itself may be provided with an adhesive layer on its corner-applying face.

When the corner lengths to be coated are long, the work can quickly become tedious, tiring and above all unergonomic.

In both cases, the strip material must be pushed to the bottom of the edge and be pressed against the two surfaces, at the level of the two surface strips to be covered forming the profiled corner.

In addition, the application of this strip material by an applicator device must be precisely guided along the corner, with the ability to adapt to angular changes and surface unevenness.

Various devices for facilitating the laying of such strips of material have already been proposed.

From documents US 6,209,609 and US 4,406,730, devices are known for the manual laying of a flexible material in the form of a strip, such as a strip of film or veil, along an interior profiled corner or re-entrant, formed by abutting surface bands of two surfaces substantially perpendicular to each other, the laying being effected by displacement of said device in a direction parallel to the direction of extension of the profiled corner. Such a device comprises, at least, means for supporting and progressively unwinding a roll or reel of flexible strip material, means for front guidance and point or linear application of the strip of material in the edge of the corner, and at least one means for returning the strip of material scrolling between the roll or the reel and the means of guiding and point or linear application, the latter forming a longitudinal fold in the strip of material scrolling before its application in the ridge. These means are mounted together on a frame forming a common support structure of the device and provided with at least one manipulation member, such as for example a handle and/or a handle. In these two US documents, a roller with a V-shaped running surface constitutes the only means of application of the tape.

In document US Pat. No. 4,775,442, an applicator device, with unwinding and return means as mentioned below, comprises, as guide and application means, an angle iron with an opening in its sides, the strip circulating from first inside the angle then outside it (on an applicator pad) after having crossed the opening. This angle iron is preceded by two rollers arranged in a V to achieve pre-folding.

However, these known devices have several often cumulative limitations.

Thus, they are only really suitable for materials having a certain rigidity, such as thick paper or the like, and are difficult to use for a soft and flexible material such as a non-woven veil or a fabric, which does not has no outfit.

Moreover, taking into account the type of application means used and the absence of clearly defined and reproducible zones for support of the band against the two surfaces, it is often necessary to carry out an additional posterior smoothing operation to ensure a homogeneous and good quality application. The benefit of using such a device in terms of ergonomics and efficiency is limited.

Moreover, these known devices are only suitable for narrow strips (of the order of 5-6 cm): a larger strip width could not pass through the device or would not be applied.

Finally, these existing devices only provide a result that is at least acceptable (but without guarantee of continuous smoothing over the entire surface of the applied strip) if the two surfaces are smooth, form a corner with a perfect edge and are continuously inclined at 90° to each other.

The object of the present invention is to overcome at least the main drawbacks mentioned above, and in particular to propose a device of simple construction, easy to use and guaranteeing a continuous and intimate application of the tape on the surfaces and, in the edge .

To this end, it relates to a device for laying a flexible material in the form of a strip, such as a strip of film, felt, nonwoven or veil, along an interior profiled corner or re-entrant, formed by abutting surface strips of two surfaces substantially perpendicular to each other, the laying being effected by displacement of the said device in a direction parallel to the direction of extension of the profiled corner, the said device comprising, at least, one support means and progressive unwinding of a roll or reel of flexible strip material, means for front guide and application of the strip of material in the edge of the corner, and at least one means for returning the strip of material moving between the roll or reel and the guiding and application means, the latter forming a longitudinal fold in the moving strip of material before it is applied to the edge, these means being mounted together on a frame forming a support structure joint of the device and provided with at least one manipulation member, such as for example a handle and/or a handle, device characterized in that it also comprises a smoothing means with a main body configured and arranged to produce, when displacement during a laying operation, a surface application of each of the two longitudinal sides of the strip of material, located on either side of the fold, respectively against one of the adjoining surface strips of the two surfaces, located on either side on the other side of the edge, this by linear or surface pressure, said smoothing means being elastically mounted on the support structure (9) and being offset with respect to the front guide and application means, in the direction opposite to that of movement.

The invention will be better understood, thanks to the description below, which relates to preferred embodiments, given by way of non-limiting examples, and explained with reference to the appended diagrammatic drawings, in which:

, [Fig. 2] and [Fig. 3] are perspective views according to different directions of a manual laying device according to a first embodiment of the invention;

to [Fig. 6] are respectively views in elevation from below (Fig 4), from behind (Fig 5) and from the side (Fig 6) of the device of Figures 1 to 3;

is a view similar to that of FIG. 6 showing the flow path of the web of material;

is a view similar to that of Figure 4, the masking means being detached from its support arm;

and [Fig. 10] are partial detail views on another scale of the device as shown in Figures 3 and 4 respectively;

is a partial detail view on another scale and in perspective of the device represented in FIG. 8;

is a perspective view of a laying device according to a variant of the first embodiment, during a laying operation of a strip material at the level of a profiled corner (only the portion of strip being application is represented – the portion of strip running from the roller is not represented);

and [Fig. 13B] are perspective views according to two different directions of the device of FIG. 12, at the very start of the laying operation;

is a partial elevational view of an alternative embodiment of the support and unwinding means forming part of the device represented in FIGS. 12 and 13;

and [Fig. 15B] are perspective views from two different directions of a manual laying device according to a second embodiment of the invention;

is a side elevational view of the device shown in Figs 15A and 15B;

is a partial detail view on another scale of the device represented in FIG. 13B, and,

and [Fig. 18B] are symbolic views respectively in front elevation and in perspective, illustrating the functional principle of the means for guiding, applying and smoothing the device according to the invention.

Figures 1 to 18 all illustrate, for some only partially, a device 1 for laying a flexible material 2 in the form of a strip, such as a strip of film, felt, nonwoven or veil, along an interior or reentrant profiled corner 3, said corner 3 (substantially in the shape of an angle iron) being formed by abutting surface strips 4, 4' of two surfaces 5, 5' substantially perpendicular to each other and the laying (application of the strip 2) being effected by displacement of said device 1 in a direction parallel to the direction of extension DE of the profiled corner.

This device 1 comprises, at least, means 6 for supporting and progressively unwinding a roll or reel 2' of flexible strip material 2, means 7 for front guidance and application of the strip of material 2 in the edge 3' of the corner 3, and at least one means 8 for returning the strip of material 2 running between the roller or the reel 2' and the means 7 for guiding and applying, the latter forming a fold 2'' longitudinal in the moving strip of material 2 before its application in the edge 3'.

These means 6, 7, 8 are mounted together on a frame 9, which forms a common and overall support structure of the device 1 and which is provided with at least one manipulation member 10, such as for example a handle and/or a sleeve.

Typically, the profiled corner 3 forms the region of intersection between a horizontal surface 5 (a floor, a slab, a flat roof, a roof terrace, an interior courtyard, etc.) and a vertical surface 5' (wall, low wall, border , acroterion, etc.) and the strip material 2 put in place is intended to ensure superficial structural continuity between these two surfaces 5 and 5', in particular as reinforcement for a coating or liquid covering material, in particular for sealing ( formation of a seal upstand).

The manipulation member 10 can be made as a pushing member or as a pulling member, or even be assembled with the frame 9 so as to be able to be secured in two orientations, or to be able to be tilted from an orientation allowing installation by pushed to an orientation allowing installation by pulling. Preferably, the guiding and the displacement of the device 1 are both carried out by the operator (tool for entirely manual use). As a variant, the device 1 can be equipped with motorized assistance for its operation, in particular for its movement.

In accordance with the invention, the device 1 also comprises a means 11 for smoothing with a main body 11′ configured and arranged to achieve, during movement during a laying operation, a surface application of each of the two longitudinal sides 12 , 12' of the strip of material 2, located on either side of the ply 2'', respectively against one of the abutting surface strips 4, 4' of the two surfaces 5 and 5', located on either side of the edge 3', this by sliding linear pressure, said smoothing means 11 being elastically mounted on the support structure 9 and being offset with respect to the front guide and application means 7, in the direction opposite to that displacement (during a laying operation).

By providing a smoothing of the two flanks 12 and 12' by sliding linear pressure, at a distance and following the zone of application of the strip 2 in the edge 3', the device 1 according to the invention makes it possible to achieve to a homogeneous, continuous and intimate application of the strip of material 2 against the surface strips 4 and 4'. Given the presence of an adhesive or sticky substance on the surface strips 4, 4' or on the strip 2, this results in a higher quality smoothing, similar to a professional manual smoothing, but carried out much more quickly and much more ergonomic way (for example in the standing position of the operator when the member 10 is a handle).

Furthermore, the device has a limited number of functional means, resulting in a simple construction.

Moreover, the means 6 to 8 and 11 themselves having an unsophisticated construction and a basic individual operation, the maintenance of the device 1 is easy and its cost price low.

Finally, the displacement of the means 7 in the edge 3' and the double sliding linear pressure on the two surfaces 5 and 5' by the means 11 ensures isostatic guidance of the device 1 during installation (also taking into account the operator action).

In accordance with a very advantageous characteristic of the invention, the means 7 has an active zone of application of the quasi-punctual or linear type and consists of a member for displacement by sliding or rolling, this displacement taking place during a laying operation supported in the edge 3 'through the strip 2. These arrangements allow to simultaneously achieve a first intimate application of the strip 2 in the corner 3, also precisely pre-positioning said strip (before smoothing) , and directed frontal guidance.

As emerges in particular from FIGS. 4 to 6, 9 to 11 and 15 to 17, the smoothing means 11 advantageously comprises two distinct zones of linear privileged contact 13 and 13', each bearing under elastic stress against one of the two surface bands abutments 4 and 4' forming the corner 3, said linear bearing stress resulting from a displacement stress under elastic stress of the smoothing means 11 relative to the front guide and application means 7 (for example by springs 16' ) and/or deformation under elastic stress of constituent parts 14, 14' of the main body 11' of the smoothing means 11 carrying said privileged contact zones 13, 13'.

More specifically, and in accordance with an advantageous characteristic of the invention, the main body 11' of the smoothing means comprises two wings 14, 14', preferably at least partially assembled to form a body 11' substantially in the shape of a portion of angle with a split V-section at its edge, with an angle of approximately 90° between the two wings and each with a privileged linear contact zone 13, 13' at its end edge 13'' opposite the front guide and application means 7, said wings being elastically deformable by torsion and/or bending over their length, and/or displaceable against an elastic stress, in particular in the event of pressure at the level of the contact zones 13, 13' mentioned above. Thus, a continuous pressure can be obtained at the level of the linear support zones 13, 13' without possibly requiring any additional component or member.

According to a preferred practical embodiment and as also shown in the aforementioned figures, each linear privileged contact zone 13, 13' is provided by a convex rib, projecting outwards and preferably straight, in the form of a bead of material or of local deformation of the wall of the body 11' of the smoothing means 11, these ribs extending, during a laying operation, preferably in a direction substantially perpendicular to the direction DE of profiling of the corner 3. They can nevertheless alternatively also be inclined if it is necessary to expel any excess adhesive substance by scraping during installation.

Preferably, the body 11' in the form of a portion of split angle iron of the smoothing means 11 comprises a rigid front shell 15 connecting the two wings 14, 14' forming the sides of the angle iron, the latter being devoid of an edge zone on one at least part of its length, the two wings 14, 14' of said angle iron being separated by a slot 11'', mutually independent and deviating or diverging at least slightly from each other in the direction of their edges d 'free ends 14'' opposite the front shell 15 of triangular shape.

These edges have linear bearing zones 13, 13' under pressure, by elastic deformation of the flanges 14, 14', and form between them an angle greater than 90° in the absence of constraint. Seen in front elevation from its rigid shell 15, the two wings 14, 14' of the body 11' can thus diverge from the start of the slot 11'' not only by diverging from each other at the level of their facing longitudinal edges delimiting this slot, but also by inclining more outwards (progressive increase in the angle they form between them), resulting in wings slightly curved outwards.

Such a particular embodiment of the body 11 'allows the latter not only to adapt to possible variations in angle of the corner 3 (along its direction of extension DE), or even to defects in the flatness of the strips surfaces 4 and 4' forming this corner 3, but also at the fillet often present at the level of the edge 3'. In addition, it also allows good masking in the event of at least partial overlapping of strips 2.

In accordance with a first embodiment of the invention, emerging from Figures 1 to 13, the front guide and application means 7 consists of a wheel, free to rotate and with a running surface with a V-section, having an axis of rotation AR1 parallel to the axis of rotation AR2 of the means 6 for supporting and unwinding the roll or the reel 2' of flexible strip material 2. Generally, the zone 7 circulates on the rounded edge (fillet) of the V-section surface (see Figures 4, 10 and 18A).

Preferably, the body 11' in the form of a portion of split angle iron of the smoothing means 11 is assembled rigidly, and advantageously with the ability to dismantle, with a support arm 16 mounted articulated on the axis of rotation AR1 of the wheel 7 and elastically stressed around this axis, downwards and forwards. Said portion of angle iron 11' is advantageously closed at the front by a transverse wall 15' forming part of a shell 15, which also comprises curved edges 15' forming bridges of deformable material, connecting said wall 15' to the wings or sides 14, 14' of said angle portion.

The elastic stress on the arm 16, which automatically positions the means 11 under the means 7 in the absence of constraint, can for example be generated by a spring 16' (for example of the spiral spring type). This stress also provides most of the bearing force of the linear bearing zones 13, 13'.

The bridges of material 15' constitute reserves of elastic deformability for the two wings 14 and 14', making it possible to ensure privileged and constant contact at the level of the free end edges (with the surfaces 5, 5').

In accordance with a second embodiment of the invention, emerging from Figures 15 to 17, the front guide and application means 7 consists of a metal blade of the ice skate blade type, with a front nose 17 of beginning of bending and linear support of the strip of material 2.

Preferably, the body 11' in the form of a split angle portion of the smoothing means 11 is mounted rigidly, for example by interlocking or screwing and advantageously with the ability to dismantle, on a rear part of the blade 7, for example by means of a 17' Y-shaped mounting flange.

In this second embodiment, the bearing force of the linear bearing zones 13, 13' is provided substantially exclusively by the deformation of the wings 14, 14' (absence of spring 16').

In addition, it can be noted that in this embodiment the armature 9 is essentially constituted by the handle 10 on which are mounted the various functional means 6, 7 and 8, said handle 10 being attached in an articulated manner in the lower part to the skate blade forming the medium 7.

As shown in Figures 9 and 11 in particular, the removable mounting of the means 11 on the arm 16 can be achieved by mutually cooperating assembly means by interlocking (with releasable locking) 20, 20'. The arm may for example comprise one or more slots 20 in which the wall 20' of the front shell 15 fits, possibly also provided with slots for the insertion of wall portions of the arm 16.

In order to be able to prepare the device 1 before an installation operation (in particular by the installation of the strip 2) and to be able to dispose at the start of this operation, when the device 1 is positioned at the starting end of the corner 3 profiled , of a strip reserve length 2, the smoothing means 11 is advantageously provided with at least one means 18, 18' for holding with blocking a portion 19 of the start of the strip 2, for example a means 18 to double branches elastically pinching said portion 19 against each of the two wings 14, 14' of said angle iron and/or two fins 18' separated by a slot and receiving the portion by pinching between them.

As shown in particular in Figures 1 to 3, 7, 10, 12, 15 and 16, the means 8 for returning the strip of material 2, advantageously consisting of a body with a cylindrical or at least partially cylindrical surface (at the level of the zone of contact with the strip 2), whether rotating or not, is located between, on the one hand, the support and unwinding means 6 and, on the other hand, the front guiding and application means 7, and also at the front of these two means 6 and 8 in the direction of movement of the device 1 during a laying operation.

In order to avoid the formation of loose loops of strip of material 2 between the reel 2' and the corner 3, it can be provided that the support and unwinding means 6, if necessary in cooperation with the return means 8 , or configured to generate a force resisting unwinding and/or scrolling, putting the strip of material 2 under tension before it comes into contact with the smoothing means 11. (for example, absence of rolling bearing at the level of the axis AR2).

According to a preferred constructive arrangement of the device 1, the front guide and application means 7 and the angle-shaped body 11' of the smoothing means 11 together define, in the absence of constraint, a plane of symmetry PS for these two means 7 and 11, as well as for the return means 8 and the support and unwinding means 6, and advantageously also for the support frame 9, the said plane of symmetry PS being perpendicular to the axis AR2 of the said means 6 of support and unwinding. The armature 9 may in particular have two lateral support walls, mutually spaced apart, rigidly connected to one another and receiving the means 6, 7, 8 between them. In the presence of constraints, and in particular during the use of the device by an operator to carry out a laying of band 2, this symmetry will not necessarily be constantly effective, due to the elastic adaptability of the masking means 11 to the possibly variable topography of the corner 3 and to a force applied by the operator possibly off-center, without this affecting the quality of the installation.

In accordance with an additional feature of the invention, emerging in particular from Figure 14, it can be provided that the support and unwinding means 6 and the return means 8 have a width greater than that of the strip 2, authorizing, 'on the one hand, an off-center arrangement or positioning of the roller 2' with respect to a plane of symmetry perpendicular to the axis of rotation AR2 of said support and unwinding means 6 and, on the other hand, the formation of two longitudinal sides 12 and 12' of strip of material 2 of different widths with respect to the ply 2'' intended to be positioned in the edge 3' of the corner 3.

Of course, the invention is not limited to the embodiments described and shown in the appended drawings. Modifications remain possible, in particular 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 (15)

Device (1) for laying a flexible material (2) in the form of a strip, such as a band of film, felt, non-woven or veil, along an interior profiled corner (3) or re-entrant, formed by abutting surface bands (4, 4') of two surfaces (5, 5') substantially perpendicular to each other, the installation being carried out by displacement of the said device (1) in a direction parallel to the direction of extension (DE) of the profiled corner,
said device (1) comprising, at least, means (6) for supporting and progressively unwinding a roll or reel (2') of the flexible strip material (2), means (7) for guiding front and application of the strip of material (2) in the edge (3') of the corner (3), and at least one means (8) for returning the strip of material (2) running between the roller or the reel (2') and the means (7) for guiding and applying, the latter forming a longitudinal fold (2'') in the running strip of material (2) before its application in the edge (3') , these means (6, 7, 8) being mounted together on a frame (9) forming a common support structure of the device (1) and provided with at least one manipulation member (10), such as for example a handle and/or or a handle,
device (1) characterized in that it also comprises a smoothing means (11) with a main body (11') configured and arranged to achieve, during movement during a laying operation, a surface application of each of the two longitudinal sides (12, 12') of the strip of material (2), located on either side of the fold (2''), respectively against one of the abutting surface strips (4, 4') of the two surfaces (5 and 5'), situated on either side of the ridge (3'), this by sliding linear pressure, the said smoothing means (11) being elastically mounted on the support structure (9) and in being offset with respect to the front guide and application means (7), in the direction opposite to that of movement during a laying operation. Device according to Claim 1, characterized in that the means (7) has an active zone of application of the quasi-punctual or linear type and consists of a member for displacement by sliding or rolling, this displacement taking place during a resting operation in the ridge (3') through the strip (2). Device according to Claim 1 or 2, characterized in that the smoothing means (11) comprises two distinct zones of linear privileged contact (13 and 13'), each bearing under elastic stress against one of the two abutting surface bands (4 , 4') forming the wedge (3), said linear bearing stress resulting from a displacement stress under elastic stress of the smoothing means (11) relative to the front guide and application means (7) and/ or a deformation under elastic stress of constituent parts (14, 14') of the main body (11') of the smoothing means (11) carrying said privileged contact zones (13, 13'). Device according to any one of Claims 1 to 3, characterized in that the main body (11') of the smoothing means comprises two wings (14, 14'), preferably at least partially assembled to form a body (11') substantially in the shape of a V-section angle section split at its edge, with an angle of approximately 90° between the two wings (14, 14') and each with a linear privileged contact zone (13, 13' ) at its end edge (13'') opposite the front guide and application means (7), said wings being elastically deformable by torsion and/or bending along their length, and/or displaceable against an elastic stress, in particular in the event of pressure at the level of the contact zones (13, 13') mentioned above. Device according to either of Claims 3 and 4, characterized in that each linear privileged contact zone (13, 13') is provided by a convex rib, projecting outwards and preferably rectilinear, in the form of a bead of material or local deformation of the wall of the main body (11') of the smoothing means (11), these ribs extending, during a laying operation, preferably in a direction substantially perpendicular to the direction (DE) of profiling from the corner (3). Device according to any one of Claims 1 to 5, characterized in that the main body (11') in the form of a split angle portion of the smoothing means (11) comprises a rigid front shell (15) connecting the two wings ( 14, 14') forming the sides of the angle iron, the latter being devoid of an edge zone over at least part of its length, the two wings (14, 14') of the said angle iron being separated by a slot (11' '), mutually independent and deviating or diverging at least slightly from each other in the direction of their free end edges (14'') opposite the front shell (15) of triangular shape, these edges having linear zones (13, 13') of support under pressure, by elastic deformation of the wings (14, 14') and forming between them an angle greater than 90° in the absence of constraint. Device according to any one of Claims 1 to 6, characterized in that the front guide and application means (7) consists of a wheel, free in rotation and with a running surface with a V-section, presenting an axis of rotation (AR1) parallel to the axis of rotation (AR2) of the means (6) for supporting and unwinding the roll or reel (2') of flexible strip material (2). Device according to Claim 7, characterized in that the main body (11') in the form of a portion of split angle iron of the smoothing means (11) is assembled rigidly, and advantageously with the ability to be dismantled, with a support arm (16) mounted articulated on the axis of rotation (AR1) of the wheel (7) and elastically biased around this axis, downwards and forwards, said portion of angle iron (11') being advantageously closed frontally by a transverse wall ( 15') forming part of a shell (15), which also comprises curved edges (15') forming bridges of deformable material, connecting said wall (15') to the wings or sides (14, 14') of said portion of angle. Device according to any one of Claims 1 to 6, characterized in that the front guide and application means (7) consists of a metal blade of the ice skate blade type, with a front nose (17) of initiating bending and linear support of the strip of material (2). Device according to Claim 9, characterized in that the main body (11') in the form of a portion of a split angle iron of the smoothing means is mounted rigidly, for example by interlocking or screwing and advantageously with the ability to disassemble, on a rear part of the blade (7), for example via a Y-shaped fixing flange 17'. Device according to any one of Claims 1 to 10, characterized in that the smoothing means (11) is provided with at least one means (18, 18') for maintaining with blocking a portion (19) of the beginning strip (2), for example a means (18) with double branches elastically pinching said portion (19) against each of the two wings (14, 14') of said angle iron and/or two fins (18') separated by a slot and receiving the portion by pinching therebetween. Device according to any one of Claims 1 to 11, characterized in that the means (8) for returning the strip of material (2), advantageously consisting of a body with a cylindrical or at least partially cylindrical surface, rotatable or not, is located between, on the one hand, the support and unwinding means (6) and, on the other hand, the frontal guiding and application means (7), and also at the front of these two means ( 6 and 8) in the direction of movement of the device (1) during a laying operation. Device according to any one of Claims 1 to 12, characterized in that the support and unwinding means (6), where appropriate in cooperation with the return means (8), is configured to generate a force resisting unwinding and/or scrolling, putting the strip of material (2) under tension before it comes into contact with the smoothing means (11). Device according to any one of Claims 1 to 13, characterized in that the front guide and application means (7) and the angle-shaped body (11') of the smoothing means (11) together define a plane of symmetry (PS) for these two means, as well as for the return means (8) and the support and unwinding means (6), and advantageously also for the support frame (9), the said plane of symmetry (PS ) being perpendicular to the axis (AR2) of said support and unwinding means (6). Device according to any one of Claims 1 to 14, characterized in that the support and unwinding means (6) and the return means (8) have a width greater than that of the strip, authorizing, on the one hand , an off-center arrangement or positioning of the roller (2') with respect to a plane of symmetry perpendicular to the axis of rotation (AR2) of said support and unwinding means (6) and, on the other hand, the formation of two longitudinal sides (12 and 12') of strip of material (2) of different widths with respect to the fold (2'') intended to be positioned in the edge (3') of the corner (3).