Device for fixing vibrating blade on tool rest of cutting machine and blade matched with device for use

Abstract

The invention relates to a device for fastening a vibrating steel blade to the holder of a cutting machine, comprising a holder (4) having a recess (14) capable of receiving the upper end of the blade (2), a tool (22) for fastening the upper end of the blade in the recess of the holder by means of magnetic force in a direction perpendicular to the longitudinal axis (X-X) of the blade, and at least one projection (20) formed in the recess, the lug can be mounted in a cut-out (2a) open at the upper end of the blade to ensure the absorption of the cutting force.

Description

Technical Field

[0001] The present invention relates to the general field of automatic cutting of flexible materials by a vibrating blade of a cutting machine, and more particularly to fixing the blade on a blade holder of the cutting machine.

[0002] One field of application of the invention is the automated cutting of thin sheets of woven or non-woven flexible material, such as leather, in particular in the clothing, furniture or automotive interior industries. Background Art

[0003] A known method for automatically cutting sheets from flexible material comprises bringing the material in single or multiple layers to a fixed or movable cutting support of a cutting table to form a mattress and cutting the sheets according to a predetermined placement program by moving a cutting head over the cutting support of the cutting table.

[0004] Typically, the cutting head of this machine includes a steel knife that is mounted on a knife holder and vibrates vertically in the direction of its sharp edge to cut the material. A rotating blade guide acts as a slide for the blade, ensuring that the blade rotates.

[0005] The blade is generally driven to vibrate by a connecting rod-crank system, which drives the blade to move in a forward and backward translational motion. For example, the amplitude of the translational motion is 25 mm and the vibration frequency is about 100 Hz.

[0006] In addition, in order to ensure the tracking of the slices cut from the material, the cutting tool needs to apply a rotational movement of the blade around its longitudinal axis. This rotational movement is generally achieved by a blade guide and a pry bar of the cutting tool.

[0007] Typically, to allow these translational and rotational movements, the blade is secured in an upper position on the tool holder by one or more assembly screws. Tools, such as a hexagonal wrench, are required to install and remove the blade for blade replacement.

[0008] Especially in this assembly method, to replace a worn blade, the assembly screw must be manually accessed and equipped with a suitable wrench. However, the tool holder on the cutting head of the cutter usually has restrictions on use, which may require the previous disassembly of parts of the cutting head. In addition, the appropriate tools must be available, and the tightening force applied to the screw when installing a new blade is difficult to calibrate. Therefore, all these operations consume a lot of time for the user of the cutter. Summary of the invention

[0009] The main object of the present invention is therefore to propose a device for fixing a vibrating blade on a knife holder of a cutting machine which does not suffer from the above-mentioned drawbacks.

[0010] According to the invention, this object can be achieved by a device for fixing a vibrating steel blade on a cutter's blade holder, the device comprising: a knife holder having a groove capable of accommodating the upper end of the blade, A tool for fixing the upper end of the blade in the groove of the blade holder in a direction perpendicular to the longitudinal axis of the blade by magnetic force; and At least one projection is formed in the recess and can be mounted in the cutout at the upper end of the insert to ensure absorption of cutting forces.

[0011] The device according to the invention is characterized in that means are provided for fixing the upper end of the blade in the groove of the tool holder in a direction perpendicular to the longitudinal axis of the blade by magnetic forces (no mechanical attachment is required for fixing the blade in the groove of the tool holder). This magnetic fixing ensures a gap-free transmission of the cutting movement. In addition, the cutting forces associated with the forward and backward translational movement of the blade are absorbed by the obstacles generated by the shape of the interface between the blade and the groove of the tool holder, rather than by friction.

[0012] Furthermore, according to the device of the invention, the blade can be mounted and removed from the blade holder without the use of special tools (wrench, screwdriver, etc.). In fact, the mounting and removal of the blade can be done manually. This ease of mounting and removal saves a lot of time for the user of the cutting machine.

[0013] According to one embodiment, the knife holder comprises at least one magnet, which is mounted in the groove and is capable of establishing a plane bearing with the plane of the upper end of the blade to ensure that the upper end of the blade is fixed in the groove of the knife holder by magnetic force. The advantage of this embodiment is that it is simple and easy to implement. In addition, the plane bearing between the magnet and the blade can ensure better fixation of the blade.

[0014] According to another embodiment, the groove of the tool holder is magnetized to ensure that the upper end of the blade is fixed in the groove of the tool holder by magnetic force.

[0015] According to another embodiment, the groove of the tool holder comprises ferromagnetic metal, the upper end of the blade comprises a magnet, This ensures that the upper end of the blade is fixed in the groove of the blade holder by magnetic force.

[0016] In this embodiment, the groove comprises a bottom with a plane which is laterally delimited by two side edges protruding relative to the bottom.

[0017] In this case, the projection extends from the lower end of one side edge of the groove toward the other side edge in a direction substantially perpendicular to the longitudinal axis of the insert. Such a projection has the advantage of ensuring good absorption of cutting forces and acting as a key for the insert.

[0018] Alternatively, the projection is made of a pin extending from the bottom of the groove in a direction substantially perpendicular to the longitudinal axis of the blade. The advantage of this projection is that it is very convenient to install the blade.

[0019] The invention also relates to a vibrating steel blade for a cutting machine, the blade being used in conjunction with the above-mentioned fixing device. The blade comprises an upper end which can be received in the groove of the blade holder, and the upper end is fixed in the groove by a magnetic fixing device, and the upper end of the blade comprises at least one cutout which can receive a protrusion formed in the groove.

[0020] Preferably, the blade is made of high speed steel.

[0021] The invention also relates to an assembly for assembling the vibrating steel knife onto a knife holder of a cutting machine through the fixing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of an example of assembling a vibrating blade on a tool holder of a cutting machine according to the present invention.

[0023] Figure 2A and Figure 2B Shows Figure 1 Magnified view of the groove of the tool holder without and with a blade.

[0024] Figure 3A and Figure 3B Another embodiment of a projection formed in a groove of a tool holder according to the device of the present invention is shown. DETAILED DESCRIPTION

[0025] The present invention relates to the automated cutting of flexible materials by means of a vibrating blade of a cutting machine, in particular by means of a blade made of steel, such as high speed steel.

[0026] like Figure 1 As shown, the blade 2 of the cutting machine is usually mounted on a blade holder 4 of a cutting head and vibrates vertically in the direction of its sharp edge to cut the material.

[0027] For example, the blade 2 is vibrated by means of a connecting rod 6 - crank 8 system which drives the blade in a forward and backward translational movement along the longitudinal axis XX of the blade.

[0028] Furthermore, the blade 2 is guided during its translation by a set of rollers 10 distributed at arbitrary heights. These rollers 10 can also partially absorb the forces generated during cutting.

[0029] Furthermore, the rotating blade guide 12 acts as a slide for the blade 2, ensuring that the blade can rotate about the longitudinal axis XX.

[0030] like Figure 2A and Figure 2B As shown, the blade holder 4 has a groove 14 for accommodating the upper end of the blade 2 .

[0031] For example, the groove 14 may be substantially rectangular and may comprise a base 16 having a substantially planar surface, delimited transversely by two side edges 18 projecting relative to the base 16 and extending along the longitudinal axis XX of the insert.

[0032] Of course, the groove for receiving the upper end of the blade may also be designed to have other geometric shapes.

[0033] In addition, according to the present invention, a projection 20 is formed in the groove 18. Figure 2A and 2B In an exemplary embodiment of The projection 20 extends from the lower end of one side edge 18 of the groove towards the other side edge in a direction substantially perpendicular to the longitudinal axis XX of the insert.

[0034] According to the present invention, the upper end of the blade 2 comprises a notch 2a, the shape of which is substantially complementary to the shape of the projection 20. (exist Figure 2A and 2B In the example of FIG. 1 , the projection and the cutout of the blade are substantially rectangular).

[0035] This shape complementarity between the projection and the cutout of the insert is key to avoiding errors when mounting the insert on the tool holder. This shape complementarity also ensures that the cutting forces of the insert are absorbed.

[0036] According to the present invention, at least one magnet 22 is also installed in the groove 14 to establish a plane bearing with a corresponding plane of the upper end of the blade and ensure that the upper end of the blade is fixed in the groove of the tool holder by magnetism.

[0037] The number, shape and arrangement of the magnets mounted within the recesses of the tool holder may vary depending on the application and the shape of the recesses.

[0038] Similarly, different types of magnets can be used. For example, a magnet made of neodymium boron or samarium cobalt alloy or any other ferrite can be selected. The magnet can be glued to the bottom of the groove.

[0039] In this way, the blade 2 can be fixed in the groove 14 of the blade holder 4 by magnetic force without the need for any mechanical attachments (such as screws).

[0040] Combination Figure 3A and Figure 3B , different embodiments of the projections formed in the recesses of the tool holder of the device according to the invention will now be described.

[0041] exist Figure 3AIn a variant embodiment, the groove 14' of the tool holder is generally rectangular and is laterally defined by two side edges 18'. The two side edges 18 ′ project relative to the bottom of the groove and extend along the longitudinal axis XX of the insert.

[0042] Furthermore, in this variant embodiment, the projection is made of a pin 20' which extends from the bottom of the groove 14' in a direction substantially perpendicular to the longitudinal axis of the blade. For example, the pin 20' is centered on the longitudinal axis XX of the blade.

[0043] As for the blade 2', the blade 2' has a cutout 2a', the shape of which is complementary to the pin 20', ie the cutout is circular.

[0044] The advantage of this variant embodiment is that the blade is easy to machine to form the cutout 2a'. On the other hand, the shape of the pin does not ensure a critical function.

[0045] exist Figure 3B In a variant embodiment, the groove 14" of the tool holder is also substantially rectangular and is laterally delimited by two side edges 18". The two side edges 18 ″ project relative to the bottom of the groove and extend along the longitudinal axis XX of the insert.

[0046] Furthermore, in this variant embodiment, there are two protrusions, and each protrusion 20" extends from the lower end of one side edge 18" of the groove toward the other side edge along a direction substantially perpendicular to the longitudinal axis XX of the blade.

[0047] Of course, the upper end of the blade 2" is provided with two cutouts 2a", the shape of which is complementary to the two protrusions 20" of the groove.

[0048] The presence of two bumps has the advantage of ensuring excellent absorption of the cutting forces. On the other hand, the contact surface with the magnets may be limited and the final assembly may be statically overdetermined.

[0049] In addition, other methods may be considered to fix the upper end of the blade in the groove of the blade holder by magnetic force.

[0050] Therefore, in a variant embodiment not shown in the figures, the groove of the tool holder can be magnetized to ensure that the upper end of the blade is fixed in the groove of the tool holder by magnetism.

[0051] Alternatively, in another variant embodiment not shown in the figure, the groove of the tool holder can be composed of ferromagnetic metal, and the upper end of the blade can be composed of a magnet to ensure that the upper end of the blade is fixed in the groove of the tool holder by magnetism.

Claims

1. A device for fixing a vibrating steel blade on a blade holder of a cutting machine, comprising: Vibrating steel blade for cutting machine (2; 2'; 2”)； A knife holder (4), the knife holder (4) having a groove (14; 14'; 14”)； A tool for fixing the upper end of the blade in the groove of the blade holder in a direction perpendicular to the longitudinal axis (XX) of the blade by magnetic force (22); and At least one projection (20; 20'; 20”), the at least one projection (20; 20'; 20") is formed in the groove and can be mounted in a notch (2a; 2a'; 2a") at the upper end of the blade to ensure absorption of cutting forces.

2. The device according to claim 1, wherein: The tool holder (4) comprises at least one magnet (22), which is mounted in the groove and is capable of establishing a plane bearing with the plane of the upper end of the blade to ensure that the upper end of the blade is fixed in the groove of the tool holder by magnetic force.

3. The device according to claim 1, wherein: The groove of the tool holder is magnetized to ensure that the upper end of the blade is fixed in the groove of the tool holder by magnetic force.

4. The device according to claim 1, wherein: The groove of the tool holder includes ferromagnetic metal, and the upper end of the blade includes a magnet to ensure that the upper end of the blade is fixed in the groove of the tool holder by magnetic force.

5. The device according to any one of claims 1 to 4, wherein: The groove (14; 14'; 14") comprises a bottom (16) having a plane laterally delimited by two side edges (18; 18'; 18") protruding relative to the bottom.

6. The device according to claim 5, wherein: The projection (20) extends from a lower end of one side edge (18) of the groove (14) toward the other side edge in a direction substantially perpendicular to the longitudinal axis of the blade.

7. The device according to claim 5, wherein: The projection is made of a pin (20') extending from the bottom of the groove (14') in a direction substantially perpendicular to the longitudinal axis of the blade.

8. The device according to any one of claims 1 to 8, wherein: The fixing of the blade in the recess of the blade holder is without mechanical attachments.

9. A vibrating steel blade (2; 2'; 2") for a cutting machine, for use in conjunction with a fixing device according to any one of claims 1 to 9, comprising an upper end capable of being received in the groove (14; 14'; 14") of the tool holder, and the upper end being fixed in the groove by a magnetic fixing device (22), the upper end of the blade comprising at least one cutout (2a; 2a'; 2a") capable of receiving a bump formed in the groove.

10. The blade according to claim 10, wherein: The blade is made of high speed steel.

11. An assembly for mounting the vibrating steel blade according to any one of claims 10 and 11 on a blade holder of a cutting machine by means of a fixing device according to any one of claims 1 to 9.

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