EP3453642B1 - Processus et chaîne de production destinés à la collecte contrôlée d'éléments de type bande continue permettant de fabriquer des pneus - Google Patents

Processus et chaîne de production destinés à la collecte contrôlée d'éléments de type bande continue permettant de fabriquer des pneus Download PDF

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Publication number
EP3453642B1
EP3453642B1 EP18201771.5A EP18201771A EP3453642B1 EP 3453642 B1 EP3453642 B1 EP 3453642B1 EP 18201771 A EP18201771 A EP 18201771A EP 3453642 B1 EP3453642 B1 EP 3453642B1
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EP
European Patent Office
Prior art keywords
elements
continuous strip
continuous
band
drift
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP18201771.5A
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German (de)
English (en)
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EP3453642A1 (fr
Inventor
Mauro Bigogno
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pirelli and C SpA
Pirelli Tyre SpA
Original Assignee
Pirelli SpA
Pirelli Tyre SpA
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Publication date
Application filed by Pirelli SpA, Pirelli Tyre SpA filed Critical Pirelli SpA
Publication of EP3453642A1 publication Critical patent/EP3453642A1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/02—Registering, tensioning, smoothing or guiding webs transversely
    • B65H23/032—Controlling transverse register of web
    • B65H23/038—Controlling transverse register of web by rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D90/00—Component parts, details or accessories for large containers
    • B65D90/10—Manholes; Inspection openings; Covers therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H35/00—Delivering articles from cutting or line-perforating machines; Article or web delivery apparatus incorporating cutting or line-perforating devices, e.g. adhesive tape dispensers
    • B65H35/02—Delivering articles from cutting or line-perforating machines; Article or web delivery apparatus incorporating cutting or line-perforating devices, e.g. adhesive tape dispensers from or with longitudinal slitters or perforators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/40—Type of handling process
    • B65H2301/41—Winding, unwinding
    • B65H2301/414—Winding
    • B65H2301/4148—Winding slitting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2403/00—Power transmission; Driving means
    • B65H2403/50—Driving mechanisms
    • B65H2403/52—Translation screw-thread mechanisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2601/00—Problem to be solved or advantage achieved
    • B65H2601/30—Facilitating or easing
    • B65H2601/32—Facilitating or easing entities relating to handling machine
    • B65H2601/321—Access
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2801/00—Application field
    • B65H2801/93—Tyres

Definitions

  • the present invention regards a process for controlled collection of continuous strip-like elements for building tyres.
  • the invention also regards a production line that actuates the aforesaid process.
  • this type of strip-like manufactured item can be cut into pieces to form strip-like elements to be employed in the manufacturing of a carcass ply, of a belt layer, or of another component of the tyre.
  • a continuous strip-like element can be wound into coils disposed in side by side relationship around the circumferential extension of a tyre being processed, to form a reinforcement layer.
  • the manufacturing of the continuous strip-like elements normally takes place by means of a continuous process, starting from cords drawn from respective packages.
  • the cords - whose number normally equals a multiple of the quantity provided in a single continuous strip-like element - are guided along paths converging towards a rubberizing unit.
  • At the rubberizing unit at least one layer of raw elastomeric material is applied on the set of cords disposed in a coplanar manner, so as to obtain a continuous rubberized band.
  • the continuous rubberized band exiting from the rubberizing unit is conducted through a cutting unit comprising one or more knives which divide the band itself into two or more continuous strip-like elements.
  • the continuous strip-like elements are moved away from the cutting unit along mutually diverging trajectories by means of suitable drift rollers, before being conducted to respective collection stations.
  • JP S60-202057 A An exemplary embodiment of a known cutting unit is disclosed by JP S60-202057 A , wherein a rubber-coated steel cord cloth, unwound from a stock roll, is fed to a cutting device through plural guide rollers.
  • the cloth is cut in the cutting device in two parts on both sides to convey the cut parts by means of a driving means, and the cut parts are respectively wound around winding rolls.
  • the positions of the both sides of the cloth are controlled with the aid of guide rollers.
  • the guide rollers on the side parts are configured such that the position may be adjusted by an adjustment handle according to the width of the rubberized steel cord fabric.
  • NC slitter specifically address a numerically controlled slitter (NC slitter).
  • This NC slitter has a plurality of slitting knife units.
  • Each slitting knife unit has a lower knife unit and an upper knife unit.
  • the lower knife of the lower knife unit is rotated by a belt.
  • the upper knife is rotated to be driven in pressure contact with the lower knife.
  • Endless steel belts are provided to move the respective upper knife units and lower knife units in a desired direction for altering the slitted width of a sheet material such as paper or the like.
  • GB 948,047 refers to a remotely controlled slitter system which comprises a slitter blade which is supported from above a paper web and which shearingly engages a slitter band supported from below the paper web. To shift the position of the blade, a knob may be rotated in one direction or the other. A pinion is then rotated in the proper direction to move the blade to a position corresponding to the set position of the knob.
  • US 4,386,273 relates to a slitter assembly including a cutter blade which is placed in cutting engagement with a belt, so that the belt is continuously trimmed to the desired width, the remaining trimmed longitudinal portion having a varying width. The desired width is obtained by using a movable positioning means, the movement of which is controlled by a conventional servomechanism drive means including a fluid-actuated cylinder.
  • EP 0309818 A2 relates to an apparatus for continuously separating a web of material into at least two web parts, comprising a severing unit consisting of a circular severing knife and of a backing roller, over the circumference of which the web of material is guided.
  • the relative position of the web of material and of the part webs is monitored by sensing members. Variations in the relative position of the running web of material are recorded by this edge-sensing member and converted into a control signal for the web-adjusting member.
  • the web-adjusting member intended for the individual web of material consists of two deflecting rollers arranged at a distance from one another.
  • GB 2 071 060 A relates to a deviator device for webs, particularly paper webs, comprising an inlet guide surface and an outlet guide surface for said web.
  • a deviator drum is mounted rotatable about a first axis and disposed between said inlet surface and outlet surface, said web winding in contact with part of the periphery of said drum when in use.
  • Adjustable support means are provided for varying the positions of said first axis about a second axis perpendicular to the first axis and tangential both to said drum and to said inlet surface.
  • the Applicant has perceived the manner of actuating the abovementioned control, by means of timely operations of restoration of the dynamic equilibrium of the lateral thrusts induced on the continuous strip-like elements translating away from the knives in the region of generation of the strip-like elements themselves.
  • the Applicant has found that the execution of the restoration operations by means of drive members situated outside the region of generation of the continuous strip-like elements allows actuating an accurate control without interruption or decrease of productivity.
  • the invention regards a process for controlled collection of continuous strip-like elements for building tyres, according to claim 1.
  • the Applicant deems that it is thus possible to increase the productivity along the production line of the continuous strip-like elements, without having to use sophisticated systems for inhibiting occasional lateral movements of the continuous band that advances at high speed towards the cutting unit.
  • the invention regards a production line for controlled collection of continuous strip-like elements for building tyres, according to claim 6.
  • the action of modulating the drift forces is carried out in response to transverse movements carried out by the continuous band.
  • At least one first deviation from the lying plane of the continuous band is preferably imposed to the continuous strip-like elements.
  • a second deviation directed laterally relative to the longitudinal extension direction of the continuous band can also be imposed to each continuous strip-like element.
  • This lateral deviation causes the desired spreading apart of the trajectories of the continuous strip-like elements along respectively diverging trajectories.
  • the first and the second deviations can be imposed simultaneously.
  • At least one third deviation towards a lying plane of the continuous band can also be imposed to the continuous strip-like elements.
  • the continuous strip-like elements, following the third deviation are brought into mutual-coplanarity relationship.
  • the continuous strip-like elements disposed in a coplanar manner with respect to each other and laterally separated from each other, are thus adapted to be simultaneously engaged by a drive unit and to be conducted to successive treatments stations along the production line.
  • the action of modulating the drift forces can be carried out by rotating at least one of said drift rollers around a correction axis perpendicular to a rotation axis thereof.
  • the action of modulating the drift forces can be carried out in response to a notification signal.
  • the following actions can be provided for: comparing the position of a diverging stretch of at least one of said n continuous strip-like elements relative to a preset theoretical reference position; and emitting a notification signal when the difference between the position of the diverging stretch and the theoretical reference position exceeds a predetermined tolerance threshold.
  • the cutting action can be preferably executed simultaneously along the respectively opposite edges of the continuous band in order to generate pairs of continuous strip-like elements.
  • said pairs of continuous strip-like elements are generated in succession starting from outer side edges of the continuous band.
  • the action of translating the carriage takes place by effect of transverse thrust forces induced by transverse movements of the continuous band.
  • the transverse movements can be preferably actuated by means of an actuating arm that is disengaged from the cutting unit when correction has occurred.
  • the action of feeding said continuous band can preferably comprise: feeding continuous reinforcing cords longitudinally translating through an extrusion die; applying at least one raw elastomeric layer onto the continuous reinforcing cords translating through the extrusion die.
  • each continuous strip-like element is collected on a respective reel separately from the other continuous strip-like elements.
  • said continuous band is fed at a speed included between about 1 m/s and about 3 m/s.
  • said continuous band is fed at a speed included between about 1.5 m/s and about 2.5 m/s.
  • the guiding devices preferably impose, to said continuous strip-like elements, at least one first deviation from the lying plane of the continuous band.
  • the guiding devices preferably impose, to said continuous strip-like elements, at least one second deviation directed laterally relative to the longitudinal extension direction of the continuous band.
  • the guiding devices impose, to said continuous strip-like elements, at least one third deviation towards a lying plane of the continuous band.
  • the continuous strip-like elements, following the third deviation are preferably brought into mutual-coplanarity relationship.
  • the guiding devices preferably comprise drift rollers, provided for operating in contact relationship with said continuous strip-like elements.
  • each drift roller can have an operative surface with convex profile operating in contact relationship on the respective continuous strip-like element.
  • each drift roller is rotatably idle.
  • Each drift roller is rotatably supported according to a rotation axis inclined to a direction perpendicular to a longitudinal extension direction of a stretch of the continuous strip-like element upstream of the drift roller itself.
  • At least two drift rollers are preferably provided which are mutually aligned along a trajectory diverging from a longitudinal mid-line of the continuous band.
  • Each drift roller is preferably positionable around a correction axis perpendicular to a rotation axis thereof.
  • each drift roller is rotatably supported by a rod around said correction axis.
  • the adjustment devices preferably comprise a transmission lever operating on said rod.
  • the transmission lever comprises a lever radially projecting with respect to the correction axis and a drive arm constrained to the lever.
  • the drive members preferably comprise a first threaded element rotatably supported externally of said generation region.
  • the first threaded element can be operatively engaged with a second threaded element carried by the drive arm.
  • the first threaded element is preferably engaged with a support structure of the cutting unit.
  • the entire transmission lever is thus extraneous and immune to possible transverse movements induced to the cutting unit with respect to the support structure.
  • Signalling devices can also be provided for emitting a notification signal when the position of a diverging stretch of at least one continuous strip-like element exceeds a predetermined tolerance threshold.
  • the following can be provided: sensor members for detecting the position of a diverging stretch of at least one continuous strip-like element; and a comparator for comparing the position detected by the sensor members with a preset theoretical reference position.
  • At least one actuator can be provided, acting on each first threaded element for automatically adjusting the orientation of the corresponding drift roller around the aforesaid correction axis following an output signal of an electronic control unit.
  • Said knives are preferably distributed in respective pairs, mutually spaced along a longitudinal translation direction of the continuous band.
  • the knives of each pair are symmetrically disposed relative to a longitudinal mid-line of the continuous band.
  • the knives are distributed so as to define a V-shaped configuration with vertex facing the collection unit.
  • the knives are preferably carried by a carriage movable in a direction transverse to the feeding direction of the continuous band.
  • the knives are removably fixed on a support block removably fixed to the carriage.
  • the support block is positioned along a direction substantially parallel to the extension of a cutting edge of each knife.
  • the cutting unit can preferably comprise a centring guide operatively engaging the continuous band for maintaining a centred positioning of the latter relative to said knives.
  • the centring guide has a passage opening having width equal to the width of the continuous band.
  • the centring guide is preferably fixed with respect to the cutting unit.
  • Thrust devices are provided for imposing transverse movements to the knives.
  • the thrust devices are actuatable from outside said generation region.
  • the thrust devices comprise an actuating arm acting on the cutting unit.
  • the actuating arm is carried by a bar that is axially movable for imposing a transverse movement to the cutting unit.
  • the bar is preferably rotatable around a longitudinal axis thereof for disengaging the actuating arm from the cutting unit.
  • the band feeding devices can preferably comprise: devices for feeding elastomeric material to an extrusion die; devices for feeding, to the extrusion die, said reinforcing cords that are arranged parallel and adjacent to each other.
  • the collection unit comprises a plurality of reels, each dedicated to the winding of a respective continuous strip-like element.
  • the reference number 1 was used to indicate a production line for controlled collection of continuous strip-like elements for building tyres, according to the present invention.
  • the production line 1 is provided to obtain and collect a plurality of continuous strip-like elements 2, of which one is represented in detail in figure 5 , comprising a plurality of reinforcing cords 3, e.g. made of textile, synthetic and/or metallic material.
  • the reinforcing cords 3 are extended parallel to each other, along a longitudinal extension direction of the continuous strip-like element 2, preferably in mutual-coplanarity relationship.
  • the reinforcing cords 3 are incorporated in or covered by at least one layer of raw elastomeric material 4.
  • Each continuous strip-like element 2 is adapted to be used for the purpose of building tyres for vehicle wheels.
  • each continuous strip-like element 2 can for such purpose be cut into pieces of predetermined length, to be used for obtaining carcass plies, belt layers or other components of a tyre being manufactured.
  • the production line 1 comprises band feeding devices 5 that supply a continuous band 6 of elastomeric material, comprising said reinforcing cords 3, preferably but not necessarily in a quantity equal to a multiple of a predetermined number of cords present in each of the continuous strip-like elements 2 during manufacturing.
  • the band feeding devices 5 comprise cord feeding devices 7 which feed the reinforcing cords 3.
  • the cord feeding devices 7 can for example comprise at least one creel 8 which sustains a plurality of packages 8a; from each of the latter, one of the reinforcing cords 3 is drawn to be used for the purpose of forming the continuous strip-like elements 2.
  • the reinforcing cords 3 coming from the creel 8 are conducted along paths mutually converging towards an extruder 9 fed with raw elastomeric material. It is preferably provided that the reinforcing cords 3 traverse at least one guide element, for example a comb element, in proximity to an extrusion die 10 in which the elastomeric material flows.
  • the elastomeric material is preferably fed to the extrusion die 10 by means of feed devices comprising, for example, a extruder and/or a gear pump 11.
  • the elastomeric material can reach the gear pump 11 upon action of a worm screw operatively housed in the extruder 9, upstream of the gear pump itself.
  • the raw elastomeric material is applied onto the reinforcing cords 3 longitudinally translating through the die itself.
  • the reinforcing cords 3 exit from the extrusion die 10 along mutually parallel and coplanar trajectories; the cords 3 are covered with the layer 4 formed by the raw elastomeric material with which they have come into contact, to form the aforesaid continuous band 6.
  • the continuous band 6 can be subjected to the action of a tensioning unit 12, which drives the reinforcing cords 3 and the elastomeric material through the extrusion die 10 as a result of a traction action applied to the continuous band itself.
  • a cooling action can also be carried out for the continuous band 6 exiting from the extrusion die 10.
  • the cooling action allows carrying out a suitable structural consolidation of the raw elastomeric material and of the continuous band 6 in its entirety.
  • a storage unit 13 Downstream of the tensioning unit 12, a storage unit 13 can be provided that defines a winding circuit capable of storing a section of suitable length of the continuous band 6 coming from the tensioning unit 12.
  • the winding circuit defined in the storage unit 13 has a length that can be modulated in response to possible variations of productivity of the continuous band 6 by the band feeding devices 5, and/or to varied requirements of continuous band 6 downstream of the same storage unit 13.
  • a process continuity is facilitated even in the presence of variations or temporary interruptions of productivity in portions of the production line 1 respectively downstream and upstream of the same storage unit 13.
  • the continuous band 6 is fed at a speed included between about 1 m/s and about 3 m/s.
  • said continuous band 6 is fed at a speed included between about 1.5 m/s and about 2.5 m/s.
  • a "region of generation" "Z" of continuous strip-like elements 2 comprises a cutting unit 14, and guiding devices 28.
  • said generation region "Z" is obtained in a space with prismatic conformation.
  • said generation region "Z" comprises at least a part of adjustment devices 30.
  • Said generation region "Z" nevertheless does not include drive devices 33, and possibly at least one portion of a support structure 23 engaging the drive devices themselves.
  • Cutting unit 14 guiding devices 28, adjustment devices 30, drive devices 33 and support structure 23 are more precisely described hereinbelow.
  • said cutting unit 14 slidably engages the continuous band 6 in order to divide it into a plurality of continuous strip-like elements 2, each comprising a predetermined number of reinforcing cords 3.
  • a drive unit 15 situated downstream of the cutting unit 14 operates on each of the continuous strip-like elements 2 for assuring the successive movement thereof to the cutting unit 14 itself.
  • the continuous strip-like elements 2 are collected separately from each other by means of at least one collection unit 16, which in a preferred solution comprises a plurality of reels 17 each dedicated to the winding of a respective continuous strip-like element 2.
  • the cutting unit 14 comprises n knives 18 carried by a carriage 19 and operating through the continuous band 6 for generating n+1 continuous strip-like elements 2 therefrom.
  • the knives 18 are preferably distributed on one or more pairs, mutually spaced along a longitudinal translation direction "F" of the continuous band 6, preferably defining a V-shaped configuration with vertex facing the collection unit 16.
  • the knives 18 of each pair are symmetrically disposed relative to a longitudinal mid-line "L" of the continuous band 6.
  • a central knife 18 can be disposed at a vertex of the V-shaped configuration, in order to operate along the longitudinal mid-line "L" of the continuous band 6.
  • pairs of continuous strip-like elements 2 are generated in succession starting from outer side edges of the continuous band 6 itself.
  • a pair of knives 18 is provided at the vertex of the V-shaped configuration.
  • the continuous strip-like element 2 that comes to be generated in central position continues straight and the cutting unit 14 gives rise - with its own action - to an odd number of continuous strip-like elements 2, in a number equal to 2n + 1 where n is the number of pairs of knives 18 employed.
  • the knives 18 are individually and removably fixed to respective abutment seats 20 provided on the carriage 19, each by means of a respective knife locking member 20a.
  • the abutment seats 20 can be conveniently obtained on a support block 21 removably fixed to the carriage 19 by means of a block locking member 22, and positionable along a direction substantially parallel to the extension of a cutting edge 18a of each knife 18.
  • each knife 18 is also adapted to be mounted according to at least two different positions, mutually rotated 180°, in order to offer a new, previously inactive portion of the cutting edge 18a to the continuous band 6.
  • the cutting unit 14 is freely movable in a direction transverse to the longitudinal translation direction "F" of the continuous band 6.
  • the carriage 19 can be provided slidably mounted on a fixed support structure 23.
  • the support structure 23 can have guide bars 24 that are transverse relative to a longitudinal extension direction of the continuous band 6, slidably traversing guide bushings 25 carried by the carriage 19.
  • the cutting unit 14 slidably engages the continuous band 6 at a centring guide 26.
  • centring guide 26 preferably carried by the carriage 19, engages the continuous band 6 at a passage opening 27 having width equal to the width of the continuous band 6 itself.
  • the continuous band 6 can thus maintain a centred positioning with respect to the knives 18. Possible lateral movements of the continuous band 6 coming from the band feeding devices 5 are indeed easily followed by corresponding lateral translations induced to the carriage 19.
  • the engagement of the continuous band 6 through the centring guide 26 in fact transmits transverse thrust forces to the cutting unit 14, due to the same transverse movements of the continuous band 6.
  • Said guiding devices 28 are housed inside said generation region "Z" containing the cutting unit 14. Devices 28 operate on the continuous strip-like elements 2 to impart respective drift forces thereto, so as to guide them along mutually diverging trajectories moving away from the respective knives 18.
  • the guiding devices 28 comprise drift rollers 29, each of which adapted to operate in contact relationship with one of the continuous strip-like elements 2, preferably by means of an operative surface 29a with convex profile.
  • At least two drift rollers 29 are provided which are mutually aligned along a trajectory diverging from the longitudinal mid-line "L" of the continuous band 6.
  • the drift rollers 29 are supported rotatably idle, each along a respective rotation axis "X" slightly inclined to a direction perpendicular to the longitudinal extension of a stretch of the continuous strip-like element 2 upstream of the drift roller 29 itself.
  • the passage of the continuous strip-like elements 2 against the drift rollers 29 thus causes the generation of the desired drift thrusts, adapted to impose diverging trajectories to the continuous strip-like elements 2 translating away from the knives 18; such trajectories diverging with respect to each other and/or with respect to the continuous band 6.
  • the drift rollers 29 can be conveniently positioned in a manner so as to impose, to each continuous strip-like element 2, at least one first deviation from the lying plane "P" of the continuous band 6, subsequent to the cutting action of the respective knives 18, and a second deviation opposite the first, i.e. directed laterally relative to the longitudinal extension direction of the continuous band 6.
  • the first and the second deviations can also be carried out simultaneously, as components of a single oblique deviation.
  • the continuous strip-like elements 2 Before reaching the drive unit 15, at least a part of the continuous strip-like elements 2 is also subjected to a third deviation towards the lying plane "P" of the continuous band 6.
  • the continuous strip-like elements 2 are conveniently disposed coplanar to each other upon reaching the drive unit 15.
  • the size of the drift forces can be modulated by means of adjustment devices 30 associated with the guiding devices 28. It is thus possible to confer a correct and stable trajectory to the single continuous strip-like elements 2 generated by the cutting action.
  • the drift forces can also be modulated, if necessary, in response to possible transverse movements carried out by the continuous band 6. These lateral movements are induced to the continuous band 6 by various factors that are hard to predict or control, which for example are displayed at the band feeding devices 5 or other zones upstream of the cutting unit 14; such lateral movements are in fact followed by the lateral mobility of the carriage 19, but cause relative movements between the knives 18 and the single drift rollers 29, with consequent modification of the trajectories and drift thrusts induced on the continuous strip-like elements 2.
  • the modulability of the drift forces allows compensating for these variations and restoring the dynamic equilibrium conditions of the continuous strip-like elements 2 translating on the respective drift rollers 29.
  • each drift roller 29 can be conveniently supported by a rod 31 rotatably engaged through a base plate 32 carried by the support structure 23 of the cutting unit 14. More particularly, each rod 31 is rotatable around a correction axis "Y", perpendicular to the rotation axis "X" of the roller itself, upon actuation of drive members 33 situated externally of the aforesaid region of generation "Z" of continuous strip-like elements 2.
  • the drive members 33 comprise, for each drift roller 29, at least one first threaded element 34, e.g. a ring nut, rotatably engaged with the support structure 23 of the cutting unit 14, externally with respect to the aforesaid generation region "Z" containing the cutting unit 14.
  • first threaded element 34 e.g. a ring nut
  • the first threaded element 34 axially fixed with respect to the support structure 23, operates on a transmission lever 35 associated with the respective rod 31.
  • the transmission lever 35 for example comprises a drive arm 36 operatively constrained, e.g. by a ball joint 37, to a lever 38 engaged with one end of the respective rod 31 by means of a clamp 39, so as to project radially with respect to the aforesaid correction axis "Y".
  • the first threaded element 34 operatively engages a second threaded element 40, represented for example by a thread carried by the drive arm 36.
  • the modulation action of the drift forces can be manually executed, following a visual control at fairly frequent intervals of the stability of the trajectories carried out by the continuous strip-like elements 2 translating away from the knives 18.
  • An operator can in fact manually operate on the first threaded elements 34 for correcting the trajectory imposed on one or more of the continuous strip-like elements 2, upon detection of possible irregularities in the trajectories themselves.
  • the use of signalling devices 41 may be provided for emitting a notification signal, e.g. acoustic and/or visual, when the position of a diverging stretch of at least one continuous strip-like element 2 exceeds a predetermined tolerance threshold.
  • Such signalling devices 41 can for example comprise sensor members 42 e.g. of optical, mechanical or other type, which detect the position of the diverging stretch of each of the continuous strip-like elements 2, in the generation region "Z".
  • a theoretical reference position is stored of the diverging stretch of each of the continuous strip-like elements 2.
  • a comparator 44 associated with the electronic control unit 43 compares the position detected by the sensor members 42 with the preset theoretical reference position.
  • the emission of the notification signal is enabled by the signalling devices 41.
  • At least one actuator acts on each first threaded element 34 by automatically adjusting the orientation of the corresponding drift roller 39 around the aforesaid correction axis "Y" following an output signal of said electronic control unit 43.
  • each knife 18 is exerted between two contiguous reinforcing cords 3 of the continuous band 6, in a manner such that each continuous strip-like element 2 has a predetermined number of reinforcing cords 3.
  • the cutting unit 14 can also be associated with thrust devices 45 which, if necessary, are adapted to correcting the relative positioning between the continuous band 6 and the knives 18 during translation of the continuous strip-like elements 2, by imposing transverse movements to cutting unit 14. More particularly, the thrust devices 45 are adapted to be driven from outside the generation region "Z", in order to impose transverse movements to the knives 18 with respect to the drift rollers 29.
  • the thrust devices 45 comprise an actuating arm 46 carried by a bar 47, preferably with circular section, that is axially and rotatably movable through the support structure 23 of the carriage 19.
  • a control knob 48 carried by the bar 47 allows moving the actuating arm 46 between a rest condition in which it is disengaged from the carriage 19 and an operative condition in which it engages the carriage 19.
  • the actuating arm 46 can be provided for example with a fork-like end 49 in which a grip tab 50 carried by the centring guide 26 is removably insertable.
  • the actuating arm 46 In normal functioning conditions of the production line 1, the actuating arm 46 is maintained in rest condition, disengaged from the carriage 19. When a correction operation is required, an operator can intervene on the control knob 48 in order to bring the actuating arm 46 in engagement relationship with the carriage 19, and transmit small strikes or thrust actions to the carriage itself, so as to impose sudden transverse movements to the knives 18.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tyre Moulding (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Claims (10)

  1. Procédé de collecte contrôlée d'éléments en forme de bande continue (2) pour la construction de pneus, comprenant le fait :
    d'acheminer une bande continue (6) de matériau élastomère comprenant des câblés de renforcement (3) ;
    dans une région de génération (Z) d'éléments en forme de bande continue (2), de couper ladite bande continue (6) ce qui permet de générer des éléments en forme de bande continue (2) ;
    dans ladite région de génération (Z) d'éléments en forme de bande continue (2), d'appliquer des forces de dérive à chacun desdits éléments en forme de bande continue (2) pour les guider le long de trajectoires divergentes,
    dans lequel lesdites forces de dérive sont générées par le passage des éléments en forme de bande continue (2) contre des rouleaux de dérive (29) ;
    de collecter chaque élément en forme de bande continue (2), caractérisé en ce qu'il comprend en outre le fait :
    de moduler lesdites forces de dérive par des éléments d'entraînement (33) placés à l'extérieur de ladite région de génération (4) d'éléments en forme de bande continue (2) ;
    de mettre en translation latérale un chariot (19) portant des couteaux (18) pour suivre les mouvements transversaux de la bande continue (6) ; et
    de corriger le positionnement relatif entre la bande continue (6) et les couteaux (18) pendant la translation des éléments en forme de bande continue (2),
    dans lequel des corrections sont effectuées en imposant des mouvements transversaux auxdits couteaux (18) par rapport auxdits rouleaux de dérive (29), contre lesquels passent les éléments en forme de bande continue (2) .
  2. Procédé tel que revendiqué dans la revendication 1,
    dans lequel, dans ladite région de génération (Z), au moins une première déviation par rapport au plan de pose ("P") de la bande continue (6), une deuxième déviation dirigée latéralement par rapport à la direction d'extension longitudinale de la bande continue (6), et au moins une troisième déviation vers un plan de pose (P) de la bande continue (6) sont imposées aux éléments en forme de bande continue (2), où lesdits éléments en forme de bande continue (2), après la troisième déviation, sont amenés en coplanarité mutuelle.
  3. Procédé tel que revendiqué dans la revendication 1 ou 2, dans lequel l'action de modulation des forces de dérive est effectuée en faisant tourner au moins l'un desdits rouleaux de dérive (29) autour d'un axe de correction (Y) perpendiculaire à un axe de rotation (X) de ceux-ci.
  4. Procédé tel que revendiqué dans une ou plusieurs des revendications précédentes, dans lequel l'action de coupe est effectuée simultanément le long des bords respectivement opposés de la bande continue (6) pour générer des paires d'éléments en forme de bande continue (2), où lesdites paires d'éléments en forme de bande continue (2) sont générées successivement en partant des bords latéraux extérieurs de la bande continue (6).
  5. Procédé tel que revendiqué dans une ou plusieurs des revendications précédentes, dans lequel lesdits mouvements transversaux sont effectués par un bras d'actionnement (46) qui est désengagé de l'unité de coupe (14) lorsque la correction s'est produite.
  6. Chaîne de production pour la collecte contrôlée d'éléments en forme de bande continue (2) pour la construction de pneus, comprenant :
    des dispositifs d'acheminement de bande (5) pour acheminer une bande continue (6) de matériau élastomère comprenant des câblés de renforcement (3) ;
    une unité de coupe (14) s'engageant en coulissement avec ladite bande continue (6) et portant des couteaux (18) fonctionnant à travers la bande continue (6) pour générer des éléments en forme de bande continue (2) à partir de celle-ci ;
    des dispositifs de guidage (28) fonctionnant sur lesdits éléments en forme de bande continue (2) pour leur conférer des forces de dérive respectives, les guidant le long de trajectoires mutuellement divergentes ;
    au moins une unité de collecte pour collecter chaque élément en forme de bande continue (2) ;
    caractérisée en ce qu'elle comprend en outre
    des dispositifs de réglage (30) pour moduler lesdites forces de dérive sur lesdits éléments en forme de bande continue (2),
    où lesdits dispositifs de réglage (30) peuvent être actionnés par des éléments d'entraînement (33) disposés à l'extérieur d'une région de génération (Z) desdits éléments en forme de bande continue (2),
    des dispositifs de poussée (45) pour imposer des mouvements transversaux aux couteaux (18), où les dispositifs de poussée (45) comprennent un bras d'actionnement (46) agissant sur un chariot (19) portant lesdits couteaux.
  7. Chaîne de production telle que revendiquée dans la revendication 6, dans laquelle les dispositifs de guidage (28) comprennent des rouleaux de dérive (29) prévus pour fonctionner en contact avec lesdits éléments en forme de bande continue (2), où chaque rouleau de dérive (29) peut être positionné autour d'un axe de correction (Y) perpendiculaire à un axe de rotation (X) de celui-ci.
  8. Chaîne de production telle que revendiquée dans une ou plusieurs des revendications 6 et 7, dans laquelle les couteaux (18) sont répartis de manière à définir une configuration en forme de V avec le sommet faisant face à l'unité de collecte (16).
  9. Chaîne de production telle que revendiquée dans une ou plusieurs des revendications 6 à 8, dans laquelle les couteaux (18) sont portés par un chariot (19) mobile dans une direction transversale à la direction d'acheminement de la bande continue (6).
  10. Chaîne de production telle que revendiquée dans une ou plusieurs des revendications 6 à 9, dans laquelle le bras d'actionnement (46) est porté par une barre (47) qui est axialement mobile pour imposer un mouvement transversal à l'unité de coupe (14).
EP18201771.5A 2012-04-26 2013-04-22 Processus et chaîne de production destinés à la collecte contrôlée d'éléments de type bande continue permettant de fabriquer des pneus Active EP3453642B1 (fr)

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ITMI20120691 2012-04-26
US201261642123P 2012-05-03 2012-05-03
EP13729433.6A EP2841360B1 (fr) 2012-04-26 2013-04-22 Processus et chaîne de production destinés à la collecte contrôlée d'éléments de type bande continue permettant de fabriquer des pneus
PCT/IB2013/053162 WO2013160814A2 (fr) 2012-04-26 2013-04-22 Processus et chaîne de production destinés à la collecte contrôlée d'éléments de type bande continue permettant de fabriquer des pneus

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EP18201771.5A Active EP3453642B1 (fr) 2012-04-26 2013-04-22 Processus et chaîne de production destinés à la collecte contrôlée d'éléments de type bande continue permettant de fabriquer des pneus

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WO2013160814A3 (fr) 2014-03-27
MX2014012827A (es) 2015-02-10
EP2841360B1 (fr) 2018-10-24
EP2841360A2 (fr) 2015-03-04
MX356303B (es) 2018-05-22
AR090839A1 (es) 2014-12-10
RU2637405C2 (ru) 2017-12-04
CN104349995A (zh) 2015-02-11
RU2014147476A (ru) 2016-06-20
EP3453642A1 (fr) 2019-03-13
CN104349995B (zh) 2016-10-12
WO2013160814A2 (fr) 2013-10-31

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