Machine for interchangeably cutting fabric with a straight or chamfer cut

Abstract

The invention relates to a machine for interchangeably cutting fabric with a straight or chamfer cut, comprising a cutting module (4) with an upper cutting bridge (4.1) and a lower support (4.2) with at least one saw for cutting the fabric (t), once it has been arranged and tensioned, either with a straight cut (r) or a chamfer cut (c). The aforementioned bridge comprises: a single moving saw (4.10) which tilts and can be positioned in an inclined vertical position; a single vertical saw (4.11) that can slide horizontally; two saws, one vertical (4.11) and one inclined (4.11'); or two vertical saw types, one single saw (4.11) and one double saw (4.12). Rollers (4.13) tension the fabric (t) over a head (4.21) of the lower support (4.2) with a flat portion (t1) and two inclined portions (t2) for straight (r) or chamfer cutting (c).

Description

[0001] DESCRIPTION

[0002] FABRIC CUTTING MACHINE WITH STRAIGHT OR BEVEL CUTTING INTERCHANGELY

[0003] OBJECT OF THE INVENTION

[0004] The invention, as stated in the present descriptive report, refers to a machine for cutting fabric with a straight or chamfered cut, providing, to the function for which it is intended, advantages and characteristics, which are described in detail below, which represent an improvement over the current state of the art.

[0005] The object of the present invention is a machine for cutting pieces of fabric, normally wound on reels, according to a certain length, which is distinguished by the fact that it comprises, among other innovative elements, a support with a tensioning head and a cutting bridge with one or two saws that allow cutting both straight and at a bevel, thanks to the fact that it includes at least one saw that is tiltable or horizontally movable and / or a double one since the head of the support, together with rollers of the bridge, position the area of ​​the fabric to be cut in an inclined position or with a flat central portion and two inclined portions on both sides of it that allow cutting straight or at a bevel according to the saw selected at the ends of the cutting bridge, also comprising means for evacuating the resulting waste when a bevel cut is made on two sides where the fabric is inclined.

[0006] FIELD OF APPLICATION OF THE INVENTION

[0007] The field of application of the present invention falls within the sector of the industry dedicated to the manufacture of machinery for cutting fabrics.

[0008] BACKGROUND OF THE INVENTION

[0009] Machines that cut pieces of fabric unwound from a roll at specific lengths are well-known on the market. These machines typically include a cutting bridge where the fabric is positioned and tensioned so that a saw or blade can pass over it, cutting the fabric as it slides from one end to the other. However, existing machines usually only include one type of saw, typically a simple saw that, positioned perpendicular to the fabric, makes a straight cut.

[0010] There are also some machines known that include inclined saws or inclined positioning means of the fabric to perform what is called chamfer cutting.

[0011] This chamfered cut is especially used in fiberglass fabrics, for example for the manufacture of wind turbine blades, where it may be necessary to overlap the edges of the fabric and / or use pieces cut at one end in a straight cut and at the other in a chamfer.

[0012] The problem is that, with current machines, it is not possible to perform both types of cuts without changing the machine or the cutting head with one type of saw or another.

[0013] The objective of the present invention is the development of a new type of fabric cutting machine that allows both straight fabric cutting and chamfer cutting to be performed interchangeably, without having to change the cutting head or the machine.

[0014] Furthermore, a secondary objective of the present invention is to provide a cutting machine that allows the incorporation of several coils to avoid the need for an operator to be attentive to placing them each time they run out, making production much faster and able to be carried out with fewer personnel.

[0015] Furthermore, and with reference to the current state of the art, it should be noted that, at least as far as the applicant is concerned, there is no other machine of similar application that has technical, structural and constitutive characteristics equal or similar to those of the one claimed herein.

[0016] EXPLANATION OF THE INVENTION

[0017] The fabric cutting machine with a straight or chamfer cut, as proposed by the invention, is configured as an optimal solution to the objectives mentioned above, with the characterizing details that make it possible and that distinguish it being conveniently included in the final claims that accompany this description.

[0018] Specifically, what the invention proposes, as previously mentioned, is a machine for cutting pieces of fabric, normally wound on reels, according to a certain length. It has the particularity of essentially comprising a lower support with a tensioning head and an upper cutting bridge that can have one or two saws to cut the fabric, once it is arranged and tensioned between the lower support and the upper cutting bridge, either with a straight cut or with one or two chamfered cuts.

[0019] Thus, in a first embodiment option, the machine comprises, in the upper cutting bridge, a single mobile-type saw with tilting movement, such that it can be positioned vertically to make a straight cut of the fabric or can be positioned inclined to make a chamfered cut of the fabric, in which case, the fabric stretched by the lower support is laid flat in both cases, it not being necessary for it to be inclined, since only by moving the inclination of the saw is the straight or inclined cut achieved.

[0020] In a second embodiment, the machine comprises, in the upper cutting bridge, a single vertical saw that is horizontally movable; that is, it does not tilt and is only positioned vertically, allowing it to be moved to place it over a flat or inclined area of ​​the fabric to be cut. The fabric is tensioned so that it is positioned flat (perpendicular to the saw) in one area and inclined, at least in part. The single saw (without tilting it, only moving it horizontally) cuts the fabric along the inclined area, thus achieving a chamfered cut. If the support also positions the fabric flat, the saw can cut straight.

[0021] In a third embodiment, the machine comprises, in the upper cutting bridge, two saws, one that is always in a vertical position, and another that is always in an inclined position, allowing the use of one or the other to cut the fabric stretched by the lower support and which is always laid flat.

[0022] And, in a fourth and final embodiment option, the machine comprises, in the upper cutting bridge, two types of fixed saws, a single one, i.e. with a single blade and a double one, with two parallel blades, being configured and arranged in such a way that they allow the fabric to be cut both straight and at an angle, i.e., either so that the blade of the single saw makes a cut by striking perpendicularly to the laminar surface of the fabric, which would be the straight cut, or so that the two blades of the double saw make the cut by striking at a certain oblique angle on the laminar surface of the fabric.

[0023] For this purpose, in this case, the lower support head is designed to position the fabric flat or inclined, so it has a square tube configuration, along with rollers provided at the bottom of the upper bridge, such that when they are actuated to place them in working position, preferably by means of a pneumatic actuator, they position and tension the area of ​​the fabric to be cut giving it an inverted V shape so that it presents a flat central portion and two inclined portions on both sides of the central portion, in front and behind it, so that, depending on the saw that is selected from among the two types of saw provided at the ends of the cutting bridge, the single or the double, the cut can be straight or chamfered.

[0024] Thus, if the single saw is used to make a straight cut, it is made through the central part of the fabric stretched over the head, in the portion where it is stretched in a flat position, since the single saw will pass through the center inserted in a groove provided in the central area of ​​the head.

[0025] And, if the double saw is used to make the chamfer cut, the two blades of said double saw make the cut on the respective sides of the fabric positioned on the head where it is inclined.

[0026] Furthermore, it is important to note that, by means of the tensioning rollers on the underside of the bridge, whose position can be adjusted to separate or join them together, the machine allows the angle of inclination of the V-shaped fabric on the support head to be increased or decreased. This allows the angle of the chamfer cut made by the double saw to be adjusted to be wider or narrower and / or more pointed, depending on the requirements of each application. In addition, in a preferred embodiment, the machine also includes means for removing the waste resulting from the described double chamfer cut. These means preferably comprise a tilting system that rotates the support with the tensioning head to remove the fabric waste.

[0027] Furthermore, and regardless of the type of saw or saws the machine has, preferably, it also includes a fabric feeding station, with at least one roll of fabric to be cut and a displacement and advance station with at least one motorized belt cradle.

[0028] More specifically, preferably, the feeding station comprises a wheel that, as a rotary storage unit, allows different fabric reels to be loaded into the machine and the appropriate one to be selected in each case to unwind it automatically onto the motorized belt cradle of the displacement and advance station that takes it to the cutting area of ​​the machine, all without the need for this operation to be carried out by an operator.

[0029] Therefore, in the option where the cutting bridge includes two types of saws, a single and a double, the machine basically works as follows:

[0030] First, it unwinds the fabric that the wheel has placed on the belt cradle according to the length preselected by the operator on a control panel provided for this purpose, winding it onto a collection reel located behind the cutting module.

[0031] Once the desired length is reached, the operator chooses the type of cut to be made, either a straight cut or a chamfered cut, and the machine tensions the fabric in the cutting area, between the cutting bridge and the support with the tensioning head, and then the corresponding saw makes the cut.

[0032] If the chamfer cut has been selected, after the cut, the support with the head is turned over and the cutting waste obtained in the chamfer cut is automatically evacuated into a receptacle provided internally for this purpose.

[0033] In addition, preferably, the turning system itself, which evacuates the waste from the chamfer cut, also allows the layer of fabric from the reel of the wheel to be joined with the layer of the roll under construction, that is, the one that is being cut.

[0034] Thus, the unwinding of a new piece continues and, upon reaching the preselected length, the cutting is activated again, for example in this case, the straight cut, in which case, the cutting bridge moves down, tensioning the fabric on the lower support head and the blade of the single saw is inserted inside the square tube of said head proceeding to cut straight.

[0035] The advantages provided by the machine are numerous:

[0036] - It allows you to select the desired reel on the reel and unwind it automatically onto the belt cradle without the need for operators.

[0037] - It allows for both straight and chamfer cuts to be performed on the same machine, eliminating the need for two separate machines. Furthermore, this provides faster manufacturing and optimizes time and space in the factory.

[0038] - The chamfer cut can be made at the angle required for each need, for example to be able to deploy the pieces of fiberglass perfectly overlapping on a wind turbine blade.

[0039] - The head tilter provides automatic waste removal.

[0040] DESCRIPTION OF THE DRAWINGS

[0041] To complement the description being made and in order to help a better understanding of the characteristics of the invention, a sheet of drawings is attached to this descriptive document as an integral part thereof, in which the following has been represented for illustrative and non-limiting purposes:

[0042] Figure 1 shows a side elevation view of a schematic representation of an example embodiment of the machine for cutting fabric with a straight or bevel cut, which is the subject of the invention, showing its general configuration and main parts; Figure 2 shows a side elevation view of the machine of the invention similar to the previous one, in this case represented with the bobbin wheel located in contact with the motorized belt cradle; Figure 3 shows an enlarged schematic side elevation view of the cutting module comprising the machine of the invention, showing in greater detail the support with the head and the cutting bridge it comprises for positioning and cutting the fabric; Figure 4.- Figures 5-A, 5-B, 5-C, 5-D and 5-E show a schematic front elevation view of the cutting module, specifically an example of the same with two types of saws, single and double, showing their arrangement on both sides of the cutting bridge. - Figures 5-A, 5-B, 5-C, 5-D and 5-E show schematic side elevation views of the example of the cutting module shown in figure 4 in different phases of operation of the machine to perform the chamfer cut with the double saw and evacuate the waste. - Figure 6 shows a view similar to figure 5-D, where the cutting module is shown with the single saw to perform the straight cut.Figures 8-A, 8-B, 8-C, and 8-D show schematic views of the support head in the single and double saw options, represented in this case with the fabric to be cut incorporated and tensioned by the V-shaped pressure rollers, and respectively with the single saw for straight cutting and with the double saw for chamfer cutting. Figures 8-A, 8-B, 8-C, and 8-D show schematic representations of the different types of cuts that can be made with the machine of the invention. Figures 9-A, 9-B, 9-C, and 9-D show schematic representations of the cutting bridge and the lower support of the cutting module, showing the four embodiments of the machine: with a single tilting saw (Fig. 9-A), with a horizontally movable straight single saw (Fig. 9-B), with two single saws, one straight and one inclined (Fig. 9-C), and with a double saw (Fig. 9-D). 9-C, and with two types of saw, one single and one double fig.9-C.

[0043] PREFERRED EMBODIMENT OF THE INVENTION

[0044] In view of the aforementioned figures, and in accordance with the numbering adopted, one can observe in them an example of a non-limiting embodiment of the machine for cutting fabric with a straight or chamfered cut, regardless of the invention, which comprises what is described in detail below.

[0045] Thus, as can be seen in these figures, the machine (1) of the invention is one that basically comprises a cutting module (4), with an upper cutting bridge (4.1) and a lower support (4.2) to position the fabric (t) to be cut.

[0046] And, based on this already known configuration, the machine (1) that is the subject of the present invention is distinguished, essentially, by comprising, in the cutting module (4), an upper cutting bridge (4.1) with at least one saw for cutting the fabric (t), once it has been arranged and tensioned between the lower support (4.2) and the upper cutting bridge (4.1), either with a straight cut (r) or with a chamfered cut (c).

[0047] To this end, in a first embodiment, schematically represented in Figure 9-A, the machine (1) comprises, in the upper cutting bridge (4.1), a single movable saw (4.10), for example with a tilting motion, such that it can be positioned vertically to make the straight cut (r) or can be positioned at an angle to make the chamfer cut (c), in both cases on the fabric (t) positioned flat on the lower support (4.2). Preferably, the machine (1) comprises means for regulating the angle of inclination of the tilting movable saw (4.10) and thereby modifying the angle of the chamfer cut (c).

[0048] In a second embodiment (Figure 9-B), the machine (1) comprises, in the upper cutting bridge (4.1), a single simple saw (4.11) arranged in a vertical position, having in this case means to be able to horizontally modify the position of the saw perpendicular to the longitudinal axis of the beam (4.14) on which it slides to cut, and cut the fabric (t) in the area where it is placed flat, i.e., perpendicular to the saw to make the straight cut (r), or in the area where it is inclined, at least in part, and make the chamfer cut (c).

[0049] In a third embodiment (Fig. 9-C), the machine (1) comprises, in the upper cutting bridge (4.1), two interchangeable single saws, one of which is a vertical single saw (4.11) and the other an inclined single saw (4.11'), allowing either one to be used to cut the fabric stretched by the lower support (4.2), which is always positioned flat. Preferably, the inclined single saw (4.11') also has means for adjusting its angle of inclination, thus allowing modification of the angle of the chamfer cut (c).

[0050] And, in a fourth embodiment, shown in Figure 9-10 and in Figures 7-A and 7-B, the machine comprises, in the upper cutting bridge (4.1), two types of vertical saws, a single one (4.11) and a double one (4.12), which are selectable interchangeably to cut the fabric (t), once it has been arranged and tensioned between the lower support (4.2) and the upper cutting bridge (4.1), with a straight cut (r) when the single saw (4.11) is selected or with a chamfer cut (c) when the double saw (4.12) is selected.

[0051] Preferably, as shown in Figure 4, the two types of saw blades, the single (4.11) straight-cutting blade and the double (4.12) chamfer-cutting blade, are incorporated, in their rest position, at the respective ends of a transverse rail (4.14) of the cutting bridge (4.1), such that, when selecting one or the other, they slide along the rail (4.14) from one end to the other to cut the width of the fabric placed on it. In the case of the option with two single-blade saw blades, one vertical (4.11) and one angled (4.11'), these are also arranged at the respective ends of the transverse rail (4.14) to select the use of one or the other.

[0052] In any case, preferably, the lower support (4.2) comprises a tensioning head (4.21) having a quadrangular tube configuration, and, at the bottom of the cutting bridge (4.1), pressure rollers (4.13) are provided such that, in the working position, said pressure rollers (4.13) tension the area of ​​the fabric (t) to be cut over the tensioning head (4.21), giving it an inverted V shape, as shown in Figure 3 and, more specifically, in Figures 5-D and 6 and in Figures 7-A and 7-B, so that the fabric to be cut has a flat central portion (t1), coinciding with the vertex of the aforementioned V shape, and two inclined portions (t2) on both sides of the central portion, in front of and behind said head (4.21), such that the vertical single saw (4.11) cuts the fabric with a straight cut in the central part flat (t1) of the fabric (figure 6 or figure 7-A) and the double saw (4.12) Cut the fabric at a chamfer in the respective inclined portions (t2) of the fabric, generating a waste (tm) of excess fabric between both chamfer cuts.

[0053] Furthermore, this configuration of the tensioning head (4.21) of the lower support also allows chamfer cutting (c) with the option of a single vertical saw (4.11), in which case it is moved horizontally to position it on the flat or inclined area of ​​the fabric.

[0054] In any case, preferably, the cutting bridge assembly (4.1) has a vertical displacement movement, through a pneumatic actuator (8), in order to raise and lower it on the lower support (4.2) where the fabric (t) to be cut is stretched.

[0055] And, preferably, the pressure rollers (4.13) are laterally movable, for example through guides, so that they can be moved apart or closer together and to the tensioning head (4.21), thereby allowing the angle of inclination of the inclined portions (t2) of fabric to be cut at a chamfer to be increased or decreased, so that they act as means of the machine to regulate the inclination of the chamfer cut (c).

[0056] Thus, preferably the machine (1) comprises, for modifying the inclination of the chamfer cut (c), at least in the embodiment options with a single horizontally displaceable saw (4.11) or with the two types of saws (4.11, 4.12), with means that allow modifying the inclined positioning geometry of the fabric (t) in the tensioning head (4.21) of the lower support (4.2), preferably in the form of the aforementioned rollers (4.13).

[0057] Furthermore, preferably, the lower support (4.2) with the tensioning head (4.21) form a vertically movable assembly to be able to raise and lower it to tension the fabric (t) to be cut under the upper cutting bridge (4.1), the head (4.21) being associated with a rotating mechanism (4.22) on its longitudinal axis which allows it to be turned over, acting in this case as a means to evacuate the waste (tm) of excess fabric from the cutting, preferably when the chamfer cut is made with the double saw (4.12), which falls to a lower receiving belt (7) which, in turn, leads it to some collection receptacle provided for this purpose.

[0058] In any case, regardless of the type of saw that the machine includes in the cutting module (4), it also comprises a fabric feeding station (2), with support means for installing at least one coil (b) of fabric (t) to be cut, and a motorized displacement and advance station (3) of the fabric to be cut, with at least one motorized belt cradle (3.1).

[0059] Preferably, at the fabric feeding station (2), the machine (1) comprises a wheel (2.1) which, installed on a support structure (2.2), allows loading several different fabric (t) bobbins (b), preferably four, to allow the use of one or the other as appropriate.

[0060] Preferably, the support structure (2.2) of the reel wheel (2.1) (b) is equipped with horizontal displacement means to automatically position one of the reels (b) on the motorized belt cradle (3.1) of the motorized displacement and advance station (3) of the fabric to be cut, which, in collaboration with a pusher roller (3.2), ensures the unwinding of the same towards the cutting module (4), as can be seen in figures 1 and 2, preventing this operation from being carried out by an operator.

[0061] Preferably, the unwinding wheel (2.1) and the motorized belt cradle (3.1) of the displacement and advance station (3) that receives the coil (b) to be used, operate by means of an electric motor and programmable encoder through a control panel (6).

[0062] In turn, the machine (1) also comprises a collection station (5) for the cut fabric, with at least one collection roller (5.1), and electronic control means (6) which, through a processor with a user interface, for example by means of a keyboard and / or touch screen (6.1), allow the automatic operation of the different actuators of each station and module of the machine (1) to be regulated and managed.

[0063] For their part, preferably the moving elements of the cutting bridge (4.1) and the support (4.2) of the cutting module (4), including the turning mechanism, operate by means of pneumatic actuators and controllable and programmable electronics to select the single (4.11) or double (4.12) saw through the control panel (6).

[0064] Therefore, as can be seen in figures 5-A to 5-E, the operation of the cutting module (4), particularly in the option that has two types of saw, a single one (4.11) and a double one (4.12), is as follows:

[0065] - In a first phase (fig. 5-A), after the unwinding of the fabric (t) from the reel (b) that the wheel (2.1) has placed on the motorized belt cradle (3.1) and its winding on the collection roller (5.1) according to the meterage preselected by the operator on the control panel (6), the portion of fabric (t) to be cut is placed in an extended position in the cutting module (4) attached on the lower support (4.2), which is with the tensioning head (4.21) facing downwards.

[0066] - Next (fig. 5-B), the lower support assembly (4.2) with the tensioning head (4.21) descends to a lower position and then the rotating mechanism (4.22) turns the head (4.21) to position it facing upwards, just below the tissue (t) to be cut (fig. 5-C).

[0067] - After the aforementioned turning, the cutting bridge (4.1), driven by the pneumatic actuator (8), descends so that the pressing rollers (4.13) at the bottom press the fabric (t) onto the tensioning head (4.21) so that the fabric (t) takes on the inverted V shape (fig. 5-D), after which the selected saw is activated, in this case the double saw (4.12) which cuts the fabric at a chamfer on the two inclined portions (t2).

[0068] - As a consequence of this double chamfer cut, a waste (tm) is generated in the fabric, which falls onto the lower receiving belt (7) when the rotating mechanism (4.22) of the head (4.21) turns again, which is once again oriented downwards (fig. 5-E), allowing the sequence to start again, either with the same double saw (4.12) to make another chamfer cut or with the single saw (4.11) to make a straight cut, as shown in figure 6. Finally, in figures 8-A to 8-D, the different cutting options with which the pieces of fabric (t) can be cut are shown: with both ends in a straight cut (r) (fig. 8-A), with one end in a straight cut (r) and a second end in a chamfer (c) (fig. 8-B), with one end in a chamfer (c) and a second end in a straight cut (r) (fig. 8-C) or with both ends cut in chamfer (c) (fig. 8-D).

[0069] Having sufficiently described the nature of the present invention, as well as the manner of putting it into practice, it is not considered necessary to make its explanation more extensive so that any expert in the field can understand its scope and the advantages that derive from it.

Claims

CLAIMS 1.- A machine for cutting fabric with a straight or chamfered cut, comprising a cutting module (4), with an upper cutting bridge (4.1) and a lower support (4.2) for positioning the fabric (t) to be cut; characterized by comprising, in the cutting module (4), an upper cutting bridge (4.1) with at least one saw for cutting the fabric (t), once arranged and tensioned between the lower support (4.2) and the upper cutting bridge (4.1), either with a straight cut (r) or with a chamfered cut (c). 2.- Machine for cutting fabric with a straight or chamfered cut interchangeably, according to claim 1, characterized in that, in the upper cutting bridge (4.1), it comprises a single movable saw (4.10), with tilting movement, which can be positioned vertically to make the straight cut (r) or inclined to make the chamfered cut (c), in both cases on the fabric (t) positioned flat on the lower support (4.2). 3.- Machine for cutting fabric with a straight or chamfered cut interchangeably, according to claim 1, characterized in that, in the upper cutting bridge (4.1), it comprises a single vertical simple saw (4.11) with horizontal displacement movement, and cuts the fabric (t) in an area where it is placed flat to make the straight cut (r), or in an area where it is inclined, at least in part, and make the chamfered cut (c). 4.- Machine for cutting fabric with a straight or chamfered cut interchangeably, according to claim 1, characterized in that, in the upper cutting bridge (4.1), it comprises two simple saws that are interchangeably selectable, a vertical simple saw (4.11) and an inclined simple saw (4.11'), allowing the use of one or the other to cut the fabric stretched by the lower support (4.2) in a flat position. 5.- Machine for cutting fabric with a straight or chamfered cut interchangeably, according to claim 1, characterized in that, in the upper cutting bridge (4.1), it comprises two types of vertical saws, a single one (4.11) and a double one (4.12), which are selectable interchangeably to cut the fabric (t), once it is arranged and tensioned between the lower support (4.2) and the upper cutting bridge (4.1), with a straight cut (r) when the single saw (4.11) is selected or with a chamfered cut (c) when the double saw (4.12) is selected. 6.- Machine for cutting fabric with a straight or chamfered cut interchangeably, according to claim 1, characterized in that it comprises means for modifying the inclination of the chamfered cut (c). 7.- Machine for cutting fabric with a straight or chamfered cut interchangeably, according to claims 2 and 6, characterized in that, to modify the inclination of the chamfered cut (c), it comprises means for regulating the angle of inclination of the tilting mobile saw (4.10). 8.- Machine for cutting fabric with a straight or chamfered cut interchangeably, according to claims 3 and 6, characterized in that, to modify the inclination of the chamfered cut (c), it comprises means for regulating the angle of inclination of the inclined saw (4.1 T). 9.- Machine for cutting fabric with a straight or chamfered cut interchangeably, according to claim 4, 5 and 6, characterized in that, to modify the inclination of the chamfered cut (c), it comprises rollers (4.13) that allow modifying the inclined positioning geometry of the fabric (t) in a tensioning head (4.21) of the lower support (4.2). 10.- Machine for cutting fabric with a straight or chamfered cut interchangeably, according to any of the preceding claims, characterized in that the lower support (4.2) comprises a tensioning head (4.21) configured in the form of a quadrangular tube, and, in the lower part of the cutting bridge (4.1), pressure rollers (4.13) are provided such that, in working position, the rollers tension the area of ​​the fabric (t) to be cut on the tensioning head (4.21) giving it the shape of an inverted V with a flat central portion (t1) for cutting with a straight cut (r) and two inclined portions (t2) on both sides of the central portion, for cutting with a chamfer (c). 11.- Machine for cutting fabric with a straight or chamfered cut interchangeably, according to claim 10, characterized in that the pressing rollers (4.13) are movable, allowing the angle of inclination of the inclined portions (t2) of fabric to be cut at a chamfer to be increased or reduced. 12.- Machine for cutting fabric with a straight or bevel cut, depending on the claim 10 or 11, characterized in that it comprises means for evacuating a waste (tm) of excess fabric from the cutting. 13.- Machine for cutting fabric with a straight or chamfered cut interchangeably, according to claim 12, characterized in that the head (4.21) is associated with a rotating mechanism (4.22) on its longitudinal axis which allows it to be turned over, in order to evacuate the waste (tm) of excess fabric from the chamfered cut. 14.- Machine for cutting fabric with a straight or chamfered cut interchangeably, according to any of the preceding claims, characterized in that it comprises a fabric feeding station (2) with a wheel (2.1) which, installed on a support structure (2.2), allows loading several different fabric (t) bobbins (b) and allowing the use of one or the other as appropriate. 15.- Machine for cutting fabric with a straight or chamfered cut interchangeably, according to claim 14, characterized in that the support structure (2.2) of the wheel (2.1) is provided with horizontal displacement means to automatically position one of the bobbins (b) on the motorized belt cradle (3.1) of the motorized displacement and advance station (3) of the fabric to be cut, which, in collaboration with a pusher roller (3.2), ensures the unwinding of the same towards the cutting module (4).

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