ES2425636T3 - A cutting device to cut shapes into leathers - Google Patents

Abstract

A cutting device for cutting shapes on a leather laid on a plane, suitable for mounting on leather cutting machines, the device (1) being able to be mounted on a rack (M) of an automatic machine for cutting leather shapes, which have various profiles, on a leather laid in said plane and comprising a body (2) having an end part (21), the device (1) being able to be mounted on said frame (M) so that said end part (21) of the body (2), once the device (1) has been mounted on said frame (M), it is turned towards said leather lying in said plane, said body (2) being able to be activated in alternating translation with respect to said frame (M ) along a direction Z which is perpendicular to said plane on which it is laid in leather, the device (1) being characterized in that it further comprises: a drum-shaped element (3) having an outer peripheral surface (32 ), the element (3) being pr provided, along said peripheral surface (32), of a series of housings, the drum-shaped element (3) being rotatably mounted on said end part (21) of the body (2), so that it can activate in rotation with respect to said part (21) of the body (1), around an axis of rotation C that is perpendicular to said direction Z, so that the outer peripheral surface (32) thereof can rotate around the C axis; a series of cutting tools (31), each of which is provided with a respective cutting edge, which has different profiles from each other; each of the cutting tools (31) can be mounted in a corresponding housing of said series of housings present in said outer peripheral surface (32) of the drum-shaped element (3) so that the cutting edges thereof they turn towards an external direction, and because said drum-shaped element (3) can be activated in rotation around the C axis with respect to said end part (21) of said body (2) so that a single cutting tool (31) can be placed at the same time turned towards the leather and the cutting edge thereof is turned towards the leather in which the shape is to be cut.

Description

A cutting device to cut shapes into leathers.

The present invention relates to the technical sector of automatic machines used to make, in leather and / or skins, through holes, or cut-out parts that have profiles with specific shapes as required.

These automatic machines have a frame that is located above the leather and / or leather, which has been stretched on a work plane and on which the various profiles are cut as required, and whose frame, by means of relative motor organs , moves in translation over the leather.

The motors for controlling and moving the frame are programmable and controlled by a management and control unit in which different positions on the leather are memorized, when there is a need to perform various shapes after drilling or relative cuts.

In this sense, the cutting or drilling devices are predisposed in the frame of the automatic machines; These devices have a relative cutting and drilling tool that has a cutting edge that has an appropriate profile or shape to be created in the leather.

In the jargon of the sector, the cutting tool is usually called a shape cutter.

The cutting edge of the shape cutter can be closed, in the case where a cut shape is to be obtained a cut shape that has a closed profile or shape, or the edge can be opened in case it leaves to obtain a cut shape that has an open edge on the leather, that is to say a shape with a profile that is closed on itself.

The cutting device normally comprises a body to support the shape cutter, this body is mounted with respect to the frame so that the cutting edge of the shape cutter is turned towards the leather so that they can move in alternating translation perpendicular to the leather on which the perforations or profiled cuts are to be made.

In this way, the cutting edge of the shape cutter (cutting tool) can be made to cross the underlying leather and cut, by pressing a shaped part relative to the edge profile of the cutting tool, the shaped part and cut is circumscribed internally to the cutting edge.

The cutting devices currently used have a single cutting tool (or shape cutter) that is arranged with a single corresponding cutting edge that has a relative profile to be transferred onto the leather after cutting of the relative profiled part.

A body cutting tool provided with several cutting elements mounted on the periphery of a drum is known from document AU-A-90408/82. A similar tool for punching plates is known from US-A1407769.

Currently, if for different reasons or special requirements, there is a need to make cuts in the body in different positions, several perforations or profiles that have different shapes, it is necessary, before the cutting operation, proceed first with the removal of the tool cutting (shape cutter) of the cutting device and then replace it with another cutting tool that has a cutting edge with a suitable profile relative to the desired shape to be cut in the leather.

It is clear that for all cutting operations, the machine must be stopped to allow the operator to perform the removal and replacement of the tool.

An object of the present invention is therefore a device for cutting leather shapes, which can be used in automatic machines that are used to obtain shapes of various relative leather profiles, whose device eliminates the aforementioned disadvantages.

In particular, an objective of the present invention is to provide a device that makes it possible to perform cutting operations on the body that require the realization of shapes of various profiles without having to stop the machine.

The object of the present invention is obtained with a device for cutting leather shapes according to the contents of claim 1.

Other advantageous features of the device of the present invention are set forth in the dependent claims.

The characteristics of the device for cutting leather shapes of the present invention are set forth in the following description, made with reference to the attached figures of the drawings, in which:

Figure 1 is a perspective view, with some parts removed for clarity, of the main elements that constitute the device of the present invention;

Figure 2 is a partial exploded perspective view, with parts removed, from a perspective different from that of Figure 1, of some particularly significant elements of the exposed device,

Figure 3 is a perspective view of a detail of the structure of Figure 2;

Figure 4 illustrates, in side view, the device of the present invention as a whole when mounted on the frame (M), partially illustrated, of an automatic leather cutting machine;

Figure 5 is the device of the invention, shown in its entirety, in a side view that is different from the view of Figure 4;

Figure 6 is the view along the sectional plane A-A of Figure 5, while

Figure 7 illustrates the view according to plane B-B of Figure 5.

Referring to the figures, 1 designates the device for cutting leather shapes of the present invention.

This device 1, as illustrated for example in Figure 4, is suitable for being mounted on a frame (M) of an automatic leather cutting machine.

In this sense, the device comprises a body 2 that has an end portion 21; the external part 21, once the device 1 has been associated with the frame M of the automatic machine, is turned towards a leather laid in a plane, in which it has several profiles to be cut.

To perform the cutting and / or drilling operations on the underlying leather, the body 2 can be activated in alternating translation, with respect to the frame M of the automatic machine, along a direction Z which is perpendicular to the plane on which The leather is laid.

The cutting device 1 of the present invention has the peculiarity that it further comprises a drum-shaped element 3, which has an outer peripheral surface 32, and is provided along the outer peripheral surface 32, of a series of accommodation. The drum element 3 is visible in detail, for example in Figures 2 and 3.

The element 3 is rotatably mounted on the end portion 21 of the body 2 such that the relative outer peripheral surface 32 can rotate about an axis C which is perpendicular to said direction Z (see for example Figures 1 and 2).

The cutting device 1 of the present invention also presents a series of cutting tools 31, each of the tools 31 being provided with a respective running edge having a relative profile that is different from the others, each cutting tool being able to 31 be mounted in a corresponding housing in the series of housings present in the outer peripheral surface 32 of the drum element 3 so that the relative cutting edges are turned towards an external direction.

A specific peculiarity of the device 1 of the invention consists in the fact that the drum-shaped element 3 can be activated in rotation around the axis C with respect to the end part 21 of the body 2 so that a single cutting tool 31 in an instant it can be placed back towards the leather and the cutting edge of the same is turned towards the leather in which a shape is to be cut.

Thus, according to the desired profile for the profile to be cut in the body, with the device of the invention it is possible to select the correct cutting tool 31 quickly and simply and without having to resort to stopping the machine, that is, the tool having a cutting edge with the profile corresponding to the shape that is going to be made in the leather.

For this purpose it is simply enough to rotate the drum-shaped element 3 around the C axis until the cutting tool 31 in question is placed in front of the leather.

In this sense, the device 1 has first actuator means 4, constituted for example by an encoder motor, which can be operated according to the desired profile for the shape to be cut in the leather, such as to activate the element in the form of a drum 3 rotating around the C axis with respect to the end part 21 of the body 2 such as to carry one of the cutting tools 31 mounted on the element 3, having a desired profile corresponding to the shape to be cut, to turn towards the leather and have the relative cutting edge located towards the leather.

The first actuator means (encoder motor) can be advantageously connected to the control and management unit which is normally arranged in automatic machines for cutting leather shapes, in whose control and management unit the various profiles of the different shapes are stored. They are going to be cut in the leathers.

Thus, based on the data entered in the control and management unit, the first actuator means 4 can be managed in real time such as to activate the rotation of the drum-shaped element 3 so that it can be rotated around the C axis until the desired cutting tool 31 is placed in front of the leather in which the shape is to be cut. Once the desired cutting tool 31 has reached the position in front of the leather to be cut, the first actuator means 4 is deactivated and the rotation of the drum 3 is stopped.

The end part 21 of the body 2, in the embodiment of the device illustrated in the attached Figures of the drawings, and as is clearly visible, for example in Figure 1, has a fork shape having a pair of arms 22, 220 flaked and distanced from each other.

The drum-shaped element 3 can be mounted between the pair of arms 22, 202 and the first actuator member 4, responsible for activating the rotation of the drum-shaped element 3, is internally predisposed on a first arm 220 of the pair of arms 22.

To facilitate assembly operations, and possibly the replacement of the drum-shaped element 3 with another one provided with other additional cutting tools 31, or to make it possible to remove the drum-shaped element 3 from some cutting tools 31 to replace them on the other hand, that is to say to make possible the maintenance operations of the actuator member 4, the first arm 220 of the pair of arms 20, 220 is mounted with respect to the body 2, so that it can be removed from the body 2 (a situation for example illustrated in Figure 2).

For the transmission of the rotational movement to the drum-shaped element 3, the device 1 comprises a pinion 48 mounted on the axis of the first actuator member 4 and which can be activated in rotation by it, and a toothed crown 49, which is directly mounted on the drum-shaped element 3.

The pinion 48 is coupled to, and meshed with the toothed crown 49 (see, for example, Figures 2 and 3) to enable the transmission of the rotation from the first actuator means 4 to the drum-shaped element

3.

The cutting tools 31, which may be predisposed and mounted in the housings of the drum-shaped element 3, may comprise a relative closed profile cutting edge, or a relative open profile cutting edge, or both, and the tools Cutting are normally hollow internally.

In the case of cutting tools that have a closed profile cutting edge, when the leather is cut, the part of the leather that is internally circumscribed to the cutting edge of the tool can remain adhering to it during the distancing stage of The leather tool.

In this sense, in order to obviate the current additional disadvantage in the cutting devices of the known type, the device 1 of the invention can advantageously present a drum-shaped element 3 which is arranged with a series of ducts 6 for the passage of compressed air, with each of the ducts 6 leading respectively to each of the support housings of the cutting tools 31 and, consequently, leading to the hollow inner part of the cutting tools 31 (see in particular Figure 3 ).

In addition, the device 1 can present internally to the end part 21 of the body 2, a channel that communicates with a source of compressed air, the communication channel being able to be connected with a conduit 6 of the ducts 6 when the cutting tool 31 supported by the relative housing to which the conduit 6 leads is brought to a position with the relative cutting edge turned towards the leather in which a corresponding shape is to be cut, after the rotation of the drum-shaped element 3 around the axis C.

In this way, when the cutting tool 31, which has the cutting edge with a profile corresponding to the profile of the desired shape to be cut in the leather, has been placed after the rotation of the drum-shaped element 3 which is turned towards the leather, the conduit 6 connected to it, and which is in communication with the hollow internal part of the cutting tool, is connected to the above-mentioned communication channel with the source of compressed air.

Consequently, at the same time that the shape is cut, compressed air can be injected into the communication channel, thus compressed air being transported to the hollow inner part of the cutting tool, reached the end of the same to push the part of the cut leather, which is internally circumscribed to the relative cutting edge, to separate it from it.

Other features of the cutting device 1 of the present invention will be described below.

The device 1 comprises a structure 1 that supports the body 2 and further comprises actuator means 41 (for example also constituted by a motor that can be connected to a management and control unit present in the automatic machine to which the device is mounted) which are manageable so that they are able to make the structure alternately move, and thus the body 2 with the relative end part 21 and the drum element 3 with the relative cutting tools 31, along the z direction perpendicular to the leather in which the shapes are to be made (see, for example, Figure 1 or Figure 7).

The second actuator means 41 is mounted and supported by a flange 8 that is fixed to the frame M of the automatic machine for cutting leathers in which it is to be used.

The structure 60, in the embodiment of the device illustrated in the attached figures of the drawings, comprises a plate 61, provided with an axial hole, and a threaded ring nut 63 which is fixed to the plate 61 coaxially to the through hole.

As can be seen both in Fig. 1 and in Fig. 7, a screw 42 can be inserted and can rotate in the through hole and the threaded ring nut 63, the screw 42 being rotatable by a second actuator means 41.

The structure 60 further comprises a cylindrical part 65 supported by the plate 61, the cylindrical part 65 being hollow internally and having a shape that is capable of receiving and supporting, internally, a central part 28 of the body 2, the body 2 being able to be mounted with the central part 28 thereof in the cylindrical part 65, so that it can rotate with respect to the cylindrical part 65, with the relative end part 21 and the drum-shaped element 3 mounted thereon, about an axis of rotation T which is parallel to the alternating translation direction Z of the body 2, and perpendicular to the axis of rotation C of the drum-shaped element 3 (see for example Figure 1 and Figure 6).

For this purpose, the device 1 comprises third actuator means 68 (which can also be constituted for example by an encoder motor that can be connected to the control and management unit of the automatic machine) mounted on the plate 61 and which can be handle so that the body 2 rotates with respect to the cylindrical part 65 around the axis of rotation T.

In this sense, in the illustrated embodiment of the attached figures of the drawings, the cutting device 1 comprises a pulley 70 which is mounted on the body 2 on a relative end part 27 thereof, opposite the end part 21, and a belt 29, which rotates on the pulley 70, whose belt 29 can be activated by the third actuator means 68 so that the rotation of the body 2 about the axis of rotation T is activated.

A housing 80 is arranged, which can be coupled to the structure 60 to transport and protect the screw 42, the pulley 70, the belt 29 and the end part 27 of the body 2.

The cutting device is further provided with a flat support element 88 of the leather; the flat element 88 of the leather; the element is mounted in a relatively translational manner, average of an interposition of compressible elastic organs 880 (for example springs) to the outer end of the end portion 21.

The flat element 88 has a through slot 89 to make it possible to pass the cutting edge of one of the tools 31 when the cutting edge is located by turning to the leather after the rotation of the drum-shaped elements 3.

Once the control and management unit of the automatic machine has selected the profile of the shape to be performed on the leather, and the frame M of the machine has been moved on top of the leather in the position in which the profile will be cut, the first actuation means 4 are driven to rotate the drum element 3 around the axis C until the cutting tool 31 is mounted thereon, having the appropriate cutting edge, located turned and turned towards the leather.

The third actuation means 68 is then handled so that the screw 41 rotates, and accordingly the plate 61 of the structure 60, and therefore the body 2 of the device 1, is adjusted to move according to the direction Z towards the leather until the flat element 66 comes into contact with and rests against the surface of the leather.

The third actuator means 68 are however managed to continue moving the body 2 towards the leather, which determines a compression of the elastic organs 880, until the cutting edge of the cutting tool 31 is inserted into the slot 89 present in the flat element 88 and goes through the leather cutting a shape in it.

During the crossing of the leather along the cutting edge 31, the flat element 88 presses against the leather, ensures that the leather in the area involved in the cut remains perfectly stretched.

As mentioned above, during the cutting stage of the body by the cutting tool 31, compressed air can be supplied inside the communication channel that is connected to the conduit 6, which by means of the hollow internal part of the tool cutting, reaches the end of it.

In this way, the shape of the cut leather that remains circumscribed within the edge of the cutting tool is separated from it when the body 2 is moved along the Z direction away from the leather.

Thus, based on the above, the cutting device 1 can be fixed, by means of the tab 8, to a frame M of an automatic machine for cutting leather profiles.

The frame M, which can be moved with respect to the plane in which the leather is placed, can be activated such as to fill the cutting device 1 to one or more positions in which one or more shapes to be cut are presented. different profiles from each other.

Once the device has been placed in the desired position, or also while the device is moved by means of the frame M to the desired position, the first actuator means 4 can be activated such as to rotate the drum-shaped element 3 so that The cutting tool 31, which has the cutting edge with the profile corresponding to the profile of the shape to be cut in the tail, is placed turned towards the leather.

Once the device 1 has been placed as desired, and the drum-shaped element 3 has been rotated as to select the desired cutting tool 31, the third actuating means 68 can be operated to impose on the body 2 , through the rotation of the screw 42 of the forms described above, a translation along the Z direction perpendicularly towards the leather until the cutting edge of the tool has passed beyond the leather, cutting in it a shape correspondent.

According to the complexity of the figures and profiles of the shapes that will be obtained in the leather, for example if it is desired to have a particular orientation of the shapes, before the translation stage of the selected cutting tool towards the leather , the second actuator means 68 can be operated such as to rotate the body 2, by means of the rotation of the pulley 70, around the axis T such as to angularly orient the cutting edge of the cutting tool 31 with respect to the leather, in the desired orientation so that the shape is obtained.

From the above description, the advantages of the device of the present invention are obvious: in fact, unlike the prior art, the stopping of the machine is not required if necessary against shapes having different profiles on the leather.

For this purpose, it will be sufficient to activate the rotation of the drum-shaped element 3 until the cutting tool 31, which has the desired profile, is turned towards the leather.

In addition, thanks to the presence of the second actuator means 68, and also thanks to the possibility of rotating the leather 2 around the T axis, and therefore also the drum-shaped element 3 and the cutting tool 31 selected for cutting operations, it is possible to quickly and easily orient the cutting edge of the tool in the desired position with respect to the leather.

The foregoing has been described by way of non-limiting example, and it is understood that any possible constrictive variations fall within the scope of the following claims.

Claims (11)

1. A cutting device for cutting shapes on a leather lying on a plane, suitable for mounting on leather cutting machines, the device (1) being able to be mounted on a rack (M) of an automatic machine for cutting leather shapes, which have different profiles, on a leather laid in said plane and comprising a body (2) having an end part (21), the device (1) being able to be mounted on said frame (M) so that said end part (21 ) of the body (2), once the device (1) has been mounted on said frame (M), it is turned towards said leather lying in said plane, said body (2) being able to be activated in alternating translation with respect to said frame (M) along a direction Z which is perpendicular to said plane on which it is laid in leather, the device (1) being characterized in that it further comprises: a drum-shaped element (3) having an outer peripheral surface (32), the element (3) being provided, along said peripheral surface (32), of a series of housings, the element being in the form of drum (3) rotatably mounted on said end part (21) of the body (2), so that it can be activated in rotation with respect to said part (21) of the body (1), around a rotation axis C which is perpendicular to said Z direction, so that the outer peripheral surface (32) thereof can rotate around the C axis; a series of cutting tools (31), each of which is provided with a respective cutting edge, which has different profiles from each other; each of the cutting tools (31) can be mounted in a corresponding housing of said series of housings present in said outer peripheral surface (32) of the drum-shaped element (3) so that the cutting edges thereof they turn towards an external direction, and because said drum-shaped element (3) can be activated in rotation around the C axis with respect to said end part (21) of said body (2) so that a single cutting tool (31) can be placed at the same time turned towards the leather and the cutting edge thereof is turned towards the leather in which the shape is to be cut.

2.

The device of claim 1, characterized in that it comprises first actuator means (4) that can be operated, according to a desired profile to the shape to be cut in the leather, to activate the drum-shaped element (3) rotating around the axis (C) with respect to the end part (21) of the body (2) so that it carries one of the cutting tools (31) mounted on the element (3), having a corresponding desired profile for the shape that will be cut, to turn towards the leather and have the relative cutting edge located towards the leather.

3.

The device of claim 2, characterized in that the end part (21) of the body (2) has a fork shape having a pair of arms (22, 220) flanked with respect to each other and reciprocally separated, and because the element Drum-shaped (3) can be mounted between the pair of arms (22, 220) and because the first actuator means (4) are internally predisposed with respect to the first arm (220) of the pair of arms (22, 220).

Four.

The device of claim 3, characterized in that said first arm (220) of the pair of arms (20, 220) can be removed from the body (2) so that it is able to be mounted and removed from the drum-shaped element (3) and of the first actuator means (4).

5.

The device of claim 3, characterized in that it comprises a pinion (48) that can be activated to rotate by the actuator means (4), and a toothed crown (49) associated with the drum-shaped element (3), the coupling being coupled pinion (48) with the toothed crown (49) to be able to transmit the rotation from the first actuator means (4) to the drum-shaped element (3).

6.

The device of claim 1, characterized in that the drum-shaped element (3) is provided with passage ducts (6) for compressed air, each of the ducts (6) leads respectively to each of the support housings of the cutting tools (31) and because it comprises a communication channel with a source of compressed air, made in the end part (21) of the body (2), the communication channel being able to be connected with a conduit (6) of the ducts (6) when the cutting tool (31) inserted in the relative housing to which the conduit (6) leads is brought to a position with the cutting edge thereof turned towards the leather in which a shape is to be cut , after a rotation of the element (3) around the C axis.

7.

The device of claim 1, characterized in that it comprises a structure (60) that supports and supports the body (2) and that it comprises second actuating means (41) manageable to adjust the structure (60) and therefore the body (2) in relation to the end part (21) and the drum-shaped element (3) with the relative cutting tools (31) mounted on the end part (21), in alternating translation along the Z direction perpendicular to the leather in which the forms are going to be made,

the second actuator means (41) being supported by a flange (8) that can be fixed to the frame (M) of an automatic leather cutting machine.

8.

The device of claim 7, characterized in that the structure (60) comprises a plate (61) provided with a through hole, and a threaded ring nut (63) fixed to the plate (61) coaxially to the through hole, a screw ( 42) which can be inserted and can rotate in the through hole and the threaded ring nut (63), the screw (42) being manageable to be turned by the second actuator means (41).

9.

The device of claim 8, characterized in that the structure (60) further comprises a cylindrical part (65) supported by the plate (61), the cylindrical part (65) being internally hollow and having such a shape that it is capable of receiving and supporting , internally, a central part (28) of the body (2), the body (2) being able to be mounted with the central part (28) thereof in the cylindrical part (65) so that the body (2), with the relative end part (21) and the drum-shaped element (3) mounted thereon, can be rotated with respect to the cylindrical part (65) around a rotation axis T that is parallel to the direction of alternating translation Z of the body (2) and perpendicular to the axis of rotation C of the drum-shaped element (3).

10.

The device of claim 9, characterized in that it comprises third actuator means (68) mounted on the plate (61) and which can be operated to rotate the body (2) with respect to the cylindrical part (65) around the axis of T rotation.

eleven.

The device of any one of the preceding claims, characterized in that it comprises a flat element (88) for supporting the leather, the flat element (88) being mounted in a relatively translational manner, by interposing elastic means (880), to the outer end of the extreme part

(21) and presenting a through groove (89) to make possible the free passage of the cutting edge of one of the tools (31) when the tool (31) is turned towards the leather after the rotation of the shaped element drum (3).