• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a device for cutting the profile of a tread (B) for a tire made of a raw rubber mix, and a cutting method using such a device. This device is remarkable in that it comprises a frame (1) supporting a cutting assembly (2) and scrolling means (3) for scrolling said tread (B) to be cut in front of said cutting assembly. (2), said cutting assembly (2) comprising at least one knife (4) for cutting a longitudinal groove (S) in the outer face of said tread (B) and means (5) for setting vibration of said knife (4) in a transverse direction perpendicular to the running direction (X-X ') of said tread.
    公开号:FR3052388A1
    申请号:FR1655490
    申请日:2016-06-14
    公开日:2017-12-15
    发明作者:Christophe Bessac；Clement Nagode
    申请人:Michelin Recherche et Technique SA Switzerland ；Compagnie Generale des Etablissements Michelin SCA；Michelin Recherche et Technique SA France；
    IPC主号:
    专利说明:

    TECHNICAL GENERAL BACKGROUND The invention is in the field of the manufacture of tires for vehicles.
    The present invention more specifically relates to a device for cutting the profile of a tread for a tire. The invention also relates to a method of cutting the profile of a tread with such a device.
    STATE OF THE ART
    A tire for the wheel of a vehicle generally comprises several superimposed layers of rubber, as well as a metal or textile fiber structure constituting a reinforcing carcass of the tire structure.
    This tire also comprises a tread, added to the outer surface of the tire, before the vulcanization thereof.
    Figure 1 attached schematically shows the cross section of an embodiment of such a tread.
    The tread B has a trapezoidal cross-section, much wider than it is high, and incorporates a plurality of longitudinal grooves S, that is to say grooves which extend along its entire length and over a some depth from its outer surface SE. The outer surface is that intended to come into contact with the road.
    This tread is in the form of a strip of a raw rubber mixture, that is to say that has not been cooked yet.
    Currently, the tread B is obtained by extrusion and its final extrusion profile is given by an extrusion blade located at the outlet of the extruder or extruder, this blade having a substantially identical cut profile to extrude but not exactly the same as it should be taken into account that the rubbery mixture or gum swells slightly when it is in the hot state in the extruder and then retracts immediately upon leaving the extruder.
    When manufacturing tires, different treads B with different shapes of profiles must be manufactured. Accordingly, it is necessary to design a new extrusion blade to dispose at the exit of the extruder for each new tread profile to manufacture.
    In addition, the composition of the rubber compound of the tread has an impact on the geometry of the extrusion blade. It follows from the preceding that a new extrusion blade must be designed and machined as soon as the composition of the rubber mix is modified.
    Finally, and despite the means of modeling and simulation available to date, it is generally necessary to make several prototypes of extrusion blades to obtain the desired final profile of the tread, with tolerances allowed, especially because of phenomena of swelling and shrinkage of the gum at the time of extrusion.
    PRESENTATION OF THE INVENTION The purpose of the invention is to solve the aforementioned drawbacks of the state of the art. The object of the invention is in particular to avoid having to develop a new extrusion blade for each new tread profile and / or for each new composition of the rubber mix and also aims to eliminate the different development steps of these extrusion blades.
    An additional object of the invention is also to provide a device that allows to move from one tread profile to another, without the need to stop the extrusion machine. This is particularly important because stopping an extrusion machine usually means that a complete cleaning of the machine and its extrusion nozzles is required before it can be restarted, in order to eliminate all gum residues that would have cooled inside this extrusion machine. For this purpose, the invention relates to a device for cutting the profile of a tire tread made of a raw rubber mixture.
    According to the invention, this device comprises a frame supporting a cutting assembly and scrolling means for scrolling said tread to be cut in front of said cutting assembly, said cutting assembly comprising at least one cutting knife. a longitudinal groove in the outer face of said tread and means for vibrating said knife in a transverse direction perpendicular to the running direction of said tread.
    Thanks to these characteristics of the invention, the profile of the tread is cut after its exit from the extruder, using the knives of the cutting assembly. The extrusion blade placed at the exit of the extruder is then generic and allows to form a rubbery mixture strip of trapezoidal section, and optionally rectangular. The different tread patterns are then obtained by simply changing the number, shape or position of the cutter knives. This governs the number of furrows, their positions, widths and depths. This profile can be modified at will, manually or automatically.
    The development steps of the extrusion blade prototypes are also eliminated.
    Finally, it is no longer necessary to stop the extruder when it is desired to change the tread profile, it is sufficient to change the position of the knives while the rubbery mixture continues to leave the extruder and put scrap or recycling the transitional area of the tread.
    According to other advantageous and nonlimiting features of the invention, taken alone or in combination: said cutting assembly comprises means for individually adjusting the height position of a knife and / or a position adjustment means in height of the set of knives when there are several and / or means for adjusting the transverse position of said knife or knives relative to said running direction of the tread; - The cutting assembly comprises a support plate under which is or are fixed (s) or said knife (s), the support plate being arranged horizontally or in a tangent plane facing the upper face of the tread of the knife (s) can (s) cut a longitudinal groove therefrom, and being mounted at its two lateral ends on two vertical lateral leaf springs, each leaf spring having a lower end fixed to said frame and an upper end fixed to said support plate, so that said support plate can move back and forth in a transverse direction perpendicular to the running direction of said tread and under the action of said vibrating means; the support plate has on its upper face, an oblong cavity extending in the running direction of the tread, said vibrating means comprise a fixed support plate, integral with said frame, mounted above said support plate and supporting an actuator, said actuator comprises a motor which rotates about a vertical axis, an eccentrically mounted cam follower and said cam follower is received in the oblong cavity so that the rotation of the drive roller cam causes the transverse displacement of said support plate and the vibration of the knife or knives that it supports; the support plate has on its upper face, at least one roller whose head is rotatable about a vertical axis perpendicular to the running direction of the tread, said vibrating means comprise a fixed support plate, secured to said frame, mounted above said support plate and supporting an actuator, said actuator comprises a motor which causes a profiled cam to rotate about a vertical axis and said roller (s) cooperate with said profile; said cam so that the rotation of the cam causes the reciprocal movement of said support plate and the vibration of the knife or knives it supports; the means for adjusting the height position of the set of knives comprises two lateral positioning plates, each positioning plate being slidably mounted and adjustable in height relative to a flange of the frame, the support plate is fixed to each from its two ends to one of the two positioning plates and the lower end of each of the leaf springs supporting the support plate is fixed to one of the two positioning plates; - The knife or knives are driven in vibration at a frequency between 200 Hz and 500 Hz; said knife comprises a single U-shaped blade whose bottom, intended to cut the bottom of the groove, is arranged parallel to the plane of the tread and whose two lateral branches intended to cut the flanks of the groove are vertical or flared from the bottom of the U to the top of the U; said knife comprises a pair of blades respectively right and left, each blade having the shape of an L whose small branch intended to cut at least a part of the bottom of the groove is arranged parallel to the plane of the tread and whose large branch intended to cut one of the flanks of the groove is vertical or flared outwards and upwards, the two right and left blades of the same pair being fixed one behind the other on a support plate of the assembly cuts in the running direction of the tread, so that the cuts formed by their respective small branches in the tread overlap at least partially; the cutting assembly comprises a support plate arranged horizontally facing the upper face of the tread, this support plate comprises one or two transverse slots perpendicular to the running direction of the tread, each blade of a tread knife is fixed on a support block and each support block is fixed to said support plate by means of a screw which passes through the slot (s), the screw and the transverse slot (s) constituting said means for adjusting the transverse position said knife (s); said frame comprises two parallel flanges spaced from one another, said scrolling means comprise a support roll and two rollers of apply, called "upstream" and "downstream", of smaller diameter than the support roll, said roller support is rotatably mounted between the two flanges, about an axis of rotation (ΥΎ) perpendicular to the running direction (X-X ') of the tread and is disposed under said cutting assembly and the two rolls of are also rotatably mounted between the two flanges, about respective axes of rotation (Υ1-ΥΊ; Y2-Y2) parallel to the axis of rotation (YY) of the support roll, the two upstream and downstream applicator rolls being disposed on either side of said support roll so as to cooperate with the latter to pinch the tread and press against an angular portion of the outer surface of said support roll; said support roll is rotated by a motor; said support roll comprises means for lateral support of the tread on its outer surface, for example a vacuum suction device disposed inside said roll; the support roller and / or at least one of the application rollers comprises a thermal tread control device. The invention also relates to a method for cutting the profile of a tread for a tire made in a tread. raw rubber mix.
    According to the invention, it comprises the steps of: - manufacturing a tread profile using an extruder, - cutting at least one longitudinal groove on the outer surface of said tread using of the aforementioned device.
    PRESENTATION OF THE FIGURES Other features and advantages of the invention will appear from the description which will now be made, with reference to the accompanying drawings, which represent, by way of indication but not limitation, a possible embodiment.
    In these drawings: - Figure 1 is a diagram showing a cross section of a tire tread, - Figure 2 is a side view of the tread profile cutting device according to the invention. FIG. 3 is a perspective view of the device of FIG. 2, FIG. 4 is a detailed view of a portion of the device of FIGS. 2 and 3, FIG. 5 is a detailed and perspective view. of a pair of blades of a knife of the aforementioned device, - Figure 6 is an overview of four pairs of blades of the device according to the invention, - Figures 7A to 7C are diagrams in perspective showing different embodiments of these cutting blades, - Figure 8 is a side view of a portion of the actuator of the aforementioned device, - Figure 9 is a perspective view of a portion of a cutting device of the profile of a tread according to a variant of sheave 10 and 11 are detailed views of two alternative embodiments of a cam of the device of FIG. 9.
    DETAILED DESCRIPTION OF THE INVENTION
    The cutting device according to the invention will now be described in more detail with reference to FIGS. 2 and 3.
    It allows to cut the profile of a tread for tire, made of a raw rubber mix, to form the longitudinal grooves S.
    As can be seen in FIG. 3, this tread B preferably has a rectangular cross-section that is much wider than it is thick. Although this is not shown in the figures, the side bevels of this tread B (visible only in FIG. 1) may possibly have already been formed.
    The device according to the invention generally comprises a frame 1, a cutting assembly 2 and means for scrolling 3 of said tread B. The means 3 make it possible to scroll the band inside the device , in a running direction represented by the X-X 'axis and in a running direction from the upstream AM to the downstream AV.
    An exemplary embodiment of this frame 1 will now be described.
    The frame 1 comprises a flat base 10 on which are fixed two lateral flanges 11 vertical, parallel and spaced apart from each other.
    Preferably, each flange 11 has a rectangular central portion 110 which is extended at its upper part and on either side by an upstream lug 111 and a downstream lug 112.
    The flange 11 extends in a vertical plane parallel to the axis X-X '.
    Each flange 11 is extended at its lower part by a base 113 fixed by any appropriate means on the base 10. In addition, the flange 11 preferably has two upstream reinforcement legs 114 and downstream 115 of triangular shape and which extend perpendicular to the flange plane 11.
    This frame is advantageously made of metal.
    The frame 1 could also have another shape.
    Preferably, the scrolling means 3 comprise a support roll 30 and two upstream (downstream) and downstream 32 (downstream) rollers 32, the latter being visible only in FIG.
    The support roller 30 is of larger diameter than the two application rollers 31 and 32. The support roller 30 is rotatably mounted between the two lateral flanges 11, about an axis of rotation YY 'perpendicular to the direction of rotation. X-X 'scrolling.
    Furthermore, the upstream applicator roller 31 is rotatably mounted between the two upstream lugs 111 of the flanges 11, about an axis of rotation Υ1-ΥΊ parallel to the axis Y-Y '.
    Similarly, the downstream roller 112 is rotatably mounted between the two downstream lugs 112 about an axis of rotation Y2-Y'2, also parallel to the Y-Y 'scroll axis.
    Preferably, the rollers 31 and 32 are mounted idle. They could however possibly be motorized.
    As can be seen in FIG. 2, the applied rollers 31 and 32 are arranged so that their respective axes of rotation Υ1-ΥΊ and Y2-Y'2 are at a height greater than that of the axis of rotation. Y-Y 'of the support roll 30. The axes of rotation of these rollers 31, 32 thus form, with the axis of rotation Y-Y' of the support roll 30, a loading angle α, preferably greater than 90 °, which favors the retention of the band B on the roll 30. The space between the outer surface of the rollers 31 and 32 and the outer surface of the support roll 30 is also adapted to allow the passage between the two, tread B and its plating and holding on the support roller 30.
    Advantageously, a downstream belt (not shown in the figures) is disposed downstream of the device according to the invention. It is located under the tread in which the grooves S have been formed and it supports it at the exit of the cutting device and drives it out of the device.
    Although this is not shown in the figures either, it is also possible to provide an upstream belt to bring the tread to the input of the cutting device, that is to say between the roller of applique upstream 31 and the support roller 30.
    Advantageously, the support roller 30 can also be rotated by means of a motor, which limits the tension of the tread and its deformation.
    Advantageously also, guiding rollers, not shown in the figures, may be provided on either side of the upstream applicator roll 31 and the downstream applicator roll 32, in order to avoid lateral drift of the tread B inside the cutting device.
    Finally, advantageously, the support roll 30 may be provided with a device for lateral support of the tread B. This device is for example a vacuum gripping system. In this case, the outer surface of the roller 30 is pierced with a plurality of orifices connected to a device placed inside the roller 30 and which creates a vacuum. The tread B is thus pressed against the outer surface of the support roll 30.
    Furthermore, the support roller 30 and / or the application rollers 31, 32 may be provided with a thermal regulation device, which allows, for example by circulating a refrigerant fluid inside said rollers, avoid heating of the tread B, heating that could result for example the friction thereof between the rollers. Conversely, in the case where the material to be cut is too cold, it is also possible to consider its heating by the circulation of a heating fluid inside the rollers 30, 31, 32. Other embodiments of the scrolling means 3 could also be envisaged, using for example only conveyor belts on flat floor or not and not rollers.
    An exemplary embodiment of a cutting assembly 2 will now be described in more detail in connection with FIGS. 2 and 4.
    This cutting assembly 2 comprises a plate 20 for supporting at least one knife 4 which cuts the grooves S.
    Although not shown in the figures, additional knives could be provided to cut the side beveled sides of the tread.
    This plate 20 has a rectangular shape, it is arranged transversely with respect to the frame 1 and above the highest zone of the support roll 30.
    Two leaf springs 21 are fixed respectively to the two lateral ends of the support plate 20.
    More specifically, the upper end 211 of each leaf spring 21 is fixed, (for example by screwing), to the lateral flanks of the support plate 20. The cutting assembly 2 also comprises an actuator 5 which constitutes a means of implementation. vibration of the knife (s) 4.
    A support plate 22 (which appears better in FIG. 3) supports this actuator 5. It is disposed above the support plate 20.
    According to a first embodiment not shown in the figures, the support plate 22 can be fixed directly to the upper part of the two flanges 11 of the frame 1. In this case, the lower end 212 of each blade spring 21 is then also attached to one of the flanges 11.
    However, according to a preferred embodiment of the invention shown in the figures, the cutting assembly 2 is adjustable in height.
    In this case, the cutting assembly 2 also comprises two identical positioning side plates 23. Each positioning plate 23 has substantially the shape of an H with in its upper part a U-shaped cutout 230 which delimits two lateral branches 231. Preferably, each positioning plate 23 is disposed on the outer surface of the flange 11 and between the two reinforcing legs 114, 115.
    The two lateral ends of the support plate 22 are fixed, for example by screwing, respectively on the two upper ends of the branches 231 of the plate 23 (see Figure 3).
    The positioning plate 23 also comprises in the center of its lower part a cutout 232 allowing the end of the Y-axis Y 'of the support roller 30 to pass.
    Furthermore, the lower end 212 of the spring blade 21 is in turn fixed in the bottom of the U-shaped cutout 230, for example also by screwing.
    The positioning plate 23 comprises in each of its branches 231 at least one vertical adjustment slot 233, preferably two vertically aligned one above the other.
    Each flange 1 is pierced with four threaded holes, not visible in the figures, arranged opposite said slots 233.
    A screw 234 whose head is wider than the width of the slot 233 is inserted inside the threaded orifice, through said slot 233. By screwing the four screws 234 into the four threaded holes provided in each flange 11, it is thus possible to pinch and lock the positioning plate 23 at a given height. This position locked in height can be changed by simply unscrewing the screws 234, by moving the positioning plate 23 vertically to the new desired position and then tightening the screws 234.
    The vertical displacement of the two positioning plates 23 ensures the displacement of the support plate 22 as well as the displacement of the support plate 20, by displacement of the lower end 212 of the leaf springs 21. Thus, the height displacement of the or of the assembly of the knife (x) 4 mounted (s) on the support plate 20.
    The positioning plate 23 can also be displaced in height by means of other adjusting means, such as slide means, rack, etc. The actuator 5 comprises a motor not visible in the figures, housed inside a housing 50, arranged and fixed on the upper face of the support plate 22. This motor drives in rotation, directly or via a multiplier, a vertical output shaft 51 of axis of rotation Z-Z ', visible in FIG. 8 and perpendicular to the running direction X-X' and to the axis of rotation Y-Y 'of the roll 30.
    A cam follower 52 is eccentrically mounted at the lower free end of said drive shaft 51, so that its vertical central axis Ζ1-ΖΊ is eccentric with respect to the vertical axis of rotation Z-Z '.
    Moreover, as shown in FIG. 4, the support plate 20 has at its center an oblong cavity 201, formed either directly in the thickness of the plate or in an insert 202, fixed, for example by screwing, on the upper face 200 of the plate 20. This oblong cavity extends along an axis parallel to the scroll axis X-X '.
    The support plate 22 is pierced with a central orifice 220, through which the rotary shaft 51 passes and the cam follower 52 is positioned inside said oblong cavity 201.
    The cam follower 52 and the oblong cavity 202 are sized, so that the rotational movement of the shaft 51 causes transverse movement to the right and left of the support plate 20 (see double arrow F). This movement back and forth left and right is made possible by the flexibility of the leaf spring 21.
    These blades 21 are advantageously made of metal, preferably steel (steel spring type 45 SCD6 for example with a mechanical resistance Rm between 900 MPa and 2000 MPa depending on the temperature of income). Advantageously, they have an elastic limit of at least 600 MPa and a tensile strength greater than 800 MPa.
    The motor of the actuator 5 is rotated over a range of speeds to obtain a vibration frequency of the plate 20 and therefore the knives 4 preferably between 200 Hz and 500 Hz. The vibration of the knives 4 facilitates the cutting of the grooves S in the tread. Other means of vibrating the knives could be used.
    Another of these means is shown in Figure 9. The elements identical to those shown in Figures 2 to 4 bear the same reference numerals.
    The support plate 20 supports two rollers 61, 62 whose heads 610, 620 project on its upper face 200 and are rotatably mounted about a central axis.
    A profiled cam 63 is integral in rotation with the end of the vertical output shaft 51 of the motor of the actuator 5.
    This cam 63 has at its lower part a crown 630 having the shape of a square with rounded corners (see Figure 10). The two heads 610, 620 of the rollers bear respectively on the outer face and the inner face of this ring 630.
    The rotation of the cam 63 causes four sinusoidal oscillations, thus multiplying by four the frequency of rotation of the motor. Indeed, for a motor revolution, the cutting assembly 2 performs four movements back and forth. Thus, for example, to have a frequency of 200Hz, the motor needs to turn at 50Hz, 3000tr / min.
    A similar solution shown in Figure 11 is to use a single roller 65 secured to the plate 20 and the 650 rotating head moves in a profiled groove 640 of a cam 64, rotated by the shaft 51. A game is necessary for the roller to move in this groove. The groove has the shape of a square with rounded corners.
    Advantageously, deflection stops (not shown in the figures) can be fixed under the lower face of the support plate 22, so as to prevent the displacement of the support plate 20 in the X-X 'direction and also according to the vertical axis Z-Z ', so as to avoid any vertical "jumping" of the knives 4.
    The knives 4 are fixed below the surface of the support plate 20, in a manner to be described later.
    The knives 4 can be in two forms.
    According to a first embodiment shown in FIG. 5, the knife 4 comprises a pair of blades 41, 42 which, together, make it possible to cut a groove S.
    According to another embodiment not shown in the figures, the knife 4 may be composed of a single blade whose contour corresponds to that of the groove to be cut.
    The blades of the knives are advantageously made of steel.
    In FIG. 5, it can be seen that each left blade 41, straight line 42 of a pair has the general shape of an L, whose small branch 410, respectively 420, allows the cutting of the bottom of the furrow and whose large branch 411, respectively 421, allows the cutting of the left flank, respectively right of the groove S.
    Preferably, the major branches 411, respectively 421 are inclined from the small branch 410, respectively 420, upwardly and outwardly. However, it should be noted that the large branches 411, 421 could also be at right angles to the small branches 410, 420.
    Each blade 41, 42 has a leading edge L (cutting edge) 412, respectively 422, facing upstream of the cutting device. It is the same when the knife consists of a single blade.
    For a given pair of blades, it will be noted that the left 41 and right blades 42 are arranged successively one behind the other and on either side of a median vertical plane P, visible in FIG. 6, and which also passes through the center of the bottom of the groove S. The blades 41 and 42 are arranged so that their small branches 410, 420 cover bottom cutting areas of the groove which overlap at least partially.
    When it is necessary to make several grooves in the tread B, for example four grooves in the example shown in FIG. 6, it will be noted that, advantageously, the left blades 41 of the first and third pairs of blades are for example arranged upstream, while the straight blades 42 of these same pairs are arranged downstream and conversely for the second and fourth pairs of blades, it is instead the straight blades 42 which are disposed upstream while the left blades 41 of these same pairs are arranged downstream. This avoids tensions or deformations in the tread when scrolling thereof.
    Advantageously, and as can be seen in Figure 4, the transverse position of each blade and each pair of blades relative to the support plate 20 is adjustable. For this purpose, it will be noted that each left blade 41, respectively straight 42, is mounted on a support block 43 whose upper face is pierced with a tapped hole not visible in the figures.
    Furthermore, the support plate 20 comprises two parallel transverse slots, namely an upstream slot 203 and a downstream slot 204.
    A screw 205 whose head is wider than the width of the slots 203, 204 can be inserted into the threaded hole of the support block 43, so that the screw body passes through the slot 203 or the slot 204.
    It is easily understood that by screwing the screw 205 through the slot 203 or 204, it is possible to immobilize the support block 43 with respect to the plate 20 and that inversely by unscrewing the screw 205, it is possible to make slide block 43 to the right or to the left along slots 203, 204.
    For the same pair of blades 41, 42, it is thus possible to position the left blades 41 and right 42 so that they are more or less spaced apart from each other, thereby obtaining a furrow S more or less wide.
    Thus, in Figure 6, it will be noted that the left 41 and right blades 42 are arranged so that their small branches 410, 420 respectively, are located one behind the other, which allows to obtain a narrow groove.
    Conversely, in FIG. 5, it will be noted that the left 41 and right blades 42 are further apart from each other, so that the groove obtained is wider.
    Moreover, the same device of slots 203, 204 and screws 205 makes it possible to position each pair of blades at a given point of the support plate 20, so as to define the transverse position of the different grooves on the tread B.
    When the knife 4 consists of a single blade, it advantageously has the shape of a U whose bottom is flat and whose two lateral branches are preferably flared outwardly. In this case, the support plate 20 comprises a single transverse slot and only the transverse position of the knife relative to the support plate 20 and therefore the tread can be modified. The width of the groove obtained is fixed and dependent on the shape of the single blade. Other means for transverse positioning of the knives 4 are also conceivable, such as sliding systems. In addition, the transverse positioning of the knives previously described is manual. It could also be motorized and automated by recipe, that is to say by controlling the actuators via a computer program with the correct parameters process for obtaining optimal cutting
    Whether the knife has one or two blades, its leading edge can have different shapes, three embodiments of which are shown in Figures 7A to 7C.
    In these figures, the straight blades 42 are shown in perspective views.
    In the variant embodiment of FIG. 7A, the leading edge 422 consists of a double bevel whose protruding median edge is oriented towards the left of the figure (upstream).
    In FIG. 7B, the leading edge 422 is a single bevel extending from upstream AM downstream AV towards the inner face of this branch 421.
    Conversely, in the embodiment of Figure 7C, the leading edge 422 has a single bevel extending from the upstream AM downstream AV towards the outer face of this major branch 421.
    The choice of the shape of this leading edge will depend on the nature of the material constituting the tread B.
    Preferably, and as can be seen in FIG. 2, the leading edges 422 of the different straight blades 42 are aligned in a plane PI and / or P2 radial to the support roller 30. Similarly, the leading edges 412 left blades 41 are aligned in a plane PI and / or P2 radial to the support roller 30. To do this, the blades 41, 42 are fixed relative to the support block 43, so as to be slightly inclined. This attachment is effected for example by means of two screws 44.
    Preferably, two straight blades 42 and two left blades 41 are aligned in a first radial plane PI, and two other straight blades 42 and two other left blades 41 are aligned in a second radial plane P2 and distinct from the first plane.
    Finally, advantageously, and although this is not shown in the figures, it is also possible to provide an individual height adjustment device for each left blade 41 or right 42 relative to the support block 43, which may allow to obtain grooves S of different depth on the same tread. Each blade 41, 42 may for example be slidably mounted vertically relative to the block 43.
    权利要求:
    Claims (15)
    [1" id="c-fr-0001]
    1. Device for cutting the profile of a tread (B) for a tire made of a raw rubber mixture, characterized in that it comprises a frame (1) supporting a cutting assembly (2) and means for scrolling (3) for scrolling said tread (B) to be cut in front of said cutting assembly (2), said cutting assembly comprising at least one cutting knife (4) of a longitudinal groove (S) in the outer face of said tread (B) and means (5) for vibrating said knife (4) in a transverse direction perpendicular to the running direction (X-X ') of said tread.
    [2" id="c-fr-0002]
    2. Device according to claim 1, characterized in that said cutting assembly (2) comprises means for individually adjusting the height position of a knife (4) and / or adjusting means (23, 233). the height position of the set of knives (4) when there are several and / or adjustment means (203, 204, 205) of the transverse position of said knifes (4) with respect to said direction scrolling (X-X ') of the tread.
    [3" id="c-fr-0003]
    3. Device according to claim 1 or 2, characterized in that the cutting assembly (2) comprises a support plate (20) under which is or are fixed (s) the knife (s) (4), this support plate (20) being arranged horizontally or in a tangent plane facing the upper face of the tread (B) so that the knife (s) (4) can (nt) cut a longitudinal groove ( S), and being mounted at its two lateral ends on two vertical leaf spring blades (21), each leaf spring (21) having a lower end (212) fixed to said frame and an upper end (211) fixed to said support plate ( 20), so that said support plate (20) can move back and forth in a transverse direction perpendicular to the running direction (X-X ') of said tread (B) and this, under the action said vibrating means (5).
    [4" id="c-fr-0004]
    4. Device according to claim 3, characterized in that the support plate (20) has on its upper face (200), an oblong cavity (201) extending in the direction of travel (X-X ') of the strip rolling member (B), in that said vibrating means comprise a fixed support plate (22), integral with said frame (1), mounted above said support plate (20) and supporting an actuator (5) , in that said actuator (5) comprises a motor which rotates about a vertical axis a cam follower (52) eccentrically mounted and said cam follower (52) is received in the cavity oblong (201) so that the rotation of the cam follower (52) causes the reciprocal movement of said support plate (20) and the vibration of the knife or knives (4) that it supports.
    [5" id="c-fr-0005]
    5. Device according to claim 3, characterized in that the support plate (20) has on its upper face (200), at least one roller (61, 62, 65) whose head (610, 620, 650) is rotatable around a vertical axis perpendicular to the running direction (X-X ') of the tread (B), in that said vibrating means comprise a fixed support plate (22) integral with said frame ( 1), mounted above said support plate (20) and supporting an actuator (5), in that said actuator (5) comprises a motor which rotates about a vertical axis a cam (63, 64) and that said one or more rollers (61, 62, 65) cooperate with the profile of said cam (63, 64) so that the rotation of the cam (63, 64) causes the displacement of back and forth transverse of said support plate (20) and the vibration of the knife or knives (4) that it supports.
    [6" id="c-fr-0006]
    6. Device according to claim 2 and 4 characterized in that the means for adjusting the height position of the set of knives (4) comprises two positioning plates (23) side, each positioning plate (23) being mounted sliding and adjustable in height relative to a flange (11) of the frame (1), in that the support plate (22) is fixed at each of its two ends to one of the two positioning plates (23) and in that the lower end of each of the spring blades (21) supporting the support plate (20) is fixed to one of the two positioning plates (23).
    [7" id="c-fr-0007]
    7. Device according to one of the preceding claims, characterized in that the or knives (4) are driven in vibration at a frequency between 200 Hz and 500 Hz.
    [8" id="c-fr-0008]
    8. Device according to one of the preceding claims, characterized in that said knife (4) comprises a single U-shaped blade whose bottom, for cutting the bottom of the groove (S), is arranged parallel to the plane of the tread (B) and whose two lateral branches, intended to cut the flanks of the groove (S), are vertical or flared from the bottom of the U to the top of the U.
    [9" id="c-fr-0009]
    9. Device according to one of claims 1 to 7, characterized in that said knife (4) comprises a pair of blades respectively right (42) and left (41), each blade (41, 42) having the shape of an L whose small branch (410, 420) intended to cut at least a portion of the bottom of the groove (S) is arranged parallel to the plane of the tread (B) and the grancfè branch (411, 421) for to cut one of the flanks of the groove (S), is vertical or flared outwards and upwards, the two blades right (42) and left (41) of the same pair being fixed one behind the on a support plate (20) of the cutting assembly (2) in the running direction (X-X ') of the tread (B), so that the cuts formed by their respective small branches (410) , 420) in the tread overlap at least partially.
    [10" id="c-fr-0010]
    10. Device according to claims 2 and 8 or 2 and 9, characterized in that the cutting assembly (2) comprises a support plate (20) arranged horizontally facing the upper face of the tread (B), in that said support plate (20) comprises one or two transverse slots (203, 204) perpendicular to the running direction (X-X ') of the tread, in that each blade of a knife (4) is fixed to a support block (43) and in that each support block (43) is fixed to said support plate (20) by means of a screw (205) which passes through the slot (s) (203, 204 ), the screw (205) and the one or more transverse slots (203, 204) constituting said adjustment means (203, 204) of the transverse position of said knife (s) (4).
    [11" id="c-fr-0011]
    11. Device according to one of the preceding claims, characterized in that said frame (1) comprises two parallel flanges (11) spaced from one another, in that said scrolling means (3) comprise a support roller (30) and two rollers, called "upstream" (31) and "downstream" (32), of smaller diameter than the support roll, in that said support roll (30) is rotatably mounted between the two flanges (11), about an axis of rotation (YV) perpendicular to the running direction (X-X ') of the tread (B) and is disposed under said cutting assembly (2) and that the two application rollers (31, 32) are also rotatably mounted between the two flanges (11), about respective axes of rotation (Υ1-ΥΊ; Y2-Y'2) parallel to the axis of rotation (YY) of the support roll (30), the two upstream (31) and downstream (32) upstream rollers being arranged on either side of said support roll (30) so as to cooperate with the latter to clamp the tread (B) and press against an angular portion of the outer surface of said backing roll (30).
    [12" id="c-fr-0012]
    12. Device according to claim 11, characterized in that said support roller (30) is rotated by a motor.
    [13" id="c-fr-0013]
    13. Device according to claim 11 or 12, characterized in that said support roller (30) comprises a lateral holding means of the tread (B) on its outer surface, such as a vacuum suction device. disposed within said roll.
    [14" id="c-fr-0014]
    14. Device according to one of claims 11 to 13, characterized in that the support roller and / or at least one of the application rollers (31, 32) comprises a device for thermal regulation of the tread ( B).
    [15" id="c-fr-0015]
    15. A method of cutting the profile of a tread (B) for a tire made of a raw rubber mixture, characterized in that it comprises the steps of: - manufacturing a tread profile (B) to using an extruder, - cutting at least one longitudinal groove (S) on the outer surface of said tread (B) using the device according to any one of the preceding claims.
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    同族专利:
    公开号 | 公开日
    EP3468785B1|2020-08-05|
    CN109562584A|2019-04-02|
    WO2017216461A1|2017-12-21|
    EP3468785A1|2019-04-17|
    FR3052388B1|2018-05-18|
    US20190329510A1|2019-10-31|
    CN109562584B|2021-04-02|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US3808076A|1970-05-07|1974-04-30|J Barwell|Methods and apparatus for applying tread to tyres or wheels|
    US4206798A|1978-06-16|1980-06-10|The Goodyear Tire & Rubber Company|Apparatus for forming traction grooves in the uncured tread of a heavy off-highway tire and method therefore|WO2022028937A1|2020-08-04|2022-02-10|Compagnie Generale Des Etablissements Michelin|System and process for automatic interface recognition in tire product profiles|GB1511245A|1974-04-26|1978-05-17|Dunlop Ltd|Apparatus for producing tyre tread patterns|
    US4081017A|1976-09-27|1978-03-28|The Goodyear Tire & Rubber Company|Apparatus for grooving tires|
    JPH0474179B2|1987-12-19|1992-11-25|
    US7546861B2|2006-06-26|2009-06-16|The Goodyear Tire & Rubber Company|Tire with tread having crossed configuration sipe|
    EP2813354A1|2013-06-14|2014-12-17|Compagnie Generale Des Etablissements Michelin|Moulding element comprising cutting means for moulding and vulcanizing a tyre tread|US10894377B2|2018-12-27|2021-01-19|Moises Garcia|Tire regrooving tool and related methods|
    USD896602S1|2019-02-13|2020-09-22|Moises Garcia|Blade for a re-grooving tool|
    CN111469458A|2020-04-23|2020-07-31|刘波|Rubber tire and manufacturing system and manufacturing method thereof|
    法律状态:
    2017-06-21| PLFP| Fee payment|Year of fee payment: 2 |
    2017-12-15| PLSC| Search report ready|Effective date: 20171215 |
    2018-06-26| PLFP| Fee payment|Year of fee payment: 3 |
    2020-03-13| ST| Notification of lapse|Effective date: 20200206 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1655490|2016-06-14|
    FR1655490A|FR3052388B1|2016-06-14|2016-06-14|DEVICE FOR CUTTING A BEARING STRIP AND CUTTING METHOD USING SUCH A DEVICE|FR1655490A| FR3052388B1|2016-06-14|2016-06-14|DEVICE FOR CUTTING A BEARING STRIP AND CUTTING METHOD USING SUCH A DEVICE|
    PCT/FR2017/051496| WO2017216461A1|2016-06-14|2017-06-12|Device for cutting a profile of a tyre tread in a rubber profiled element, and cutting method using such a device|
    CN201780044724.8A| CN109562584B|2016-06-14|2017-06-12|Apparatus for cutting a tire tread profile in a rubber molding element and cutting method using such an apparatus|
    EP17734799.4A| EP3468785B1|2016-06-14|2017-06-12|Device for cutting a profile of a tyre tread in a rubber profiled element, and cutting process using such a device|
    US16/310,017| US20190329510A1|2016-06-14|2017-06-12|Device for cutting a profile of a tire tread in a rubber profiled element, and cutting method using such a device|
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