EP2841360B1 - Process and production line for controlled collection of continuous strip-like elements for building tyres - Google Patents
Process and production line for controlled collection of continuous strip-like elements for building tyres Download PDFInfo
- Publication number
- EP2841360B1 EP2841360B1 EP13729433.6A EP13729433A EP2841360B1 EP 2841360 B1 EP2841360 B1 EP 2841360B1 EP 13729433 A EP13729433 A EP 13729433A EP 2841360 B1 EP2841360 B1 EP 2841360B1
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- EP
- European Patent Office
- Prior art keywords
- elements
- continuous strip
- continuous
- drift
- knives
- Prior art date
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- 238000004519 manufacturing process Methods 0.000 title claims description 29
- 238000000034 method Methods 0.000 title claims description 14
- 230000008569 process Effects 0.000 title claims description 14
- 238000005520 cutting process Methods 0.000 claims description 56
- 230000009471 action Effects 0.000 claims description 25
- 238000012937 correction Methods 0.000 claims description 21
- 230000003014 reinforcing effect Effects 0.000 claims description 21
- 239000013536 elastomeric material Substances 0.000 claims description 15
- 238000013519 translation Methods 0.000 claims description 8
- 238000011144 upstream manufacturing Methods 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims 1
- 238000001125 extrusion Methods 0.000 description 10
- 230000014616 translation Effects 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 5
- 230000004044 response Effects 0.000 description 5
- 238000003860 storage Methods 0.000 description 5
- 230000011664 signaling Effects 0.000 description 4
- 238000004804 winding Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 2
- 239000011265 semifinished product Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000002269 spontaneous effect Effects 0.000 description 2
- 239000004753 textile Substances 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
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- 230000003287 optical effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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- 230000007480 spreading Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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Images
Classifications
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- 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
- 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
- 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
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- 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 .
- 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.
- 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.
- a structural and functional simplification of the system is also obtained, due to a spontaneous alignment of the knives with respect to the continuous band.
- the invention regards a production line for controlled collection of continuous strip-like elements for building tyres, according to claim 9.
- 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 drift forces can be preferably generated by the passage of the continuous strip-like elements against drift rollers.
- the generation of the drift forces can thus be attained by means of structurally simple, inexpensive and highly reliable components.
- 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 correcting the relative positioning between the continuous band and the knives during translation of the continuous strip-like elements can also be provided.
- Said corrections are preferably carried out by imposing transverse movements to said knives with respect to the drift rollers against which the continuous strip-like elements pass.
- 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 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 can also be provided for imposing transverse movements to the knives.
- the thrust devices are preferably actuatable from outside said generation region.
- the thrust devices can comprise an actuating arm acting on a carriage carrying said knives.
- the thrust devices can comprise an actuating arm acting on the cutting unit.
- the actuating arm is removably engageable with 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.
- 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.
- a notification signal e.g. acoustic and/or visual
- 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)
Description
- 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.
- In building tyres, the use of elementary semi-finished products obtained from continuous strip-like elements is normally required; such elements comprise textile cords and/or metallic cords that are mutually parallel and incorporated in at least one layer of raw elastomeric material.
- By way of example, 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. As an alternative, 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.
- In order to facilitate the mutual separation thereof, 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.
- An exemplary embodiment of a known cutting unit is disclosed by
JP S60-202057 A - In order to meet the productivity needs of modern plants, the Applicant has studied the dynamic behaviour of semi-finished products in continuous band form translating at high speed along the production line.
- The Applicant has thus been able to observe that, due to various factors that are hard to identify and control, the continuous band coming from the rubberizing unit occasionally carries out slight lateral movements during the advancement towards the cutting unit.
- In high speed conditions, these movements tend to significantly alter the trajectory completed by the continuous strip-like elements translating away from the knives, with the risk of consequent breakage and interruption of the manufacturing cycle.
- The Applicant has observed that an accurate control of these trajectories, in response to the occasional movements of the continuous band, can lead to significant improvements of the state of the art, particularly in terms of productivity and final product quality.
- 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.
- More precisely, 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.
- More particularly, according to a first aspect the invention regards a process for controlled collection of continuous strip-like elements for building tyres.
- 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.
- By modulating the drift forces in the above-described manner, possible deviations of the trajectories completed by the continuous strip-like elements translating away from the knives are quickly corrected, without it being necessary to stop or slow down the production to execute the required corrections. The production lines can therefore always be utilised at maximum productivity, even during modulation operations. A precise execution of the cutting is also facilitated, due to a correction of the relative positioning between the knives and the continuous band following undesired transverse movements of the latter.
- A structural and functional simplification of the system is also obtained, due to a spontaneous alignment of the knives with respect to the continuous band.
- In a second aspect, the invention regards a production line for controlled collection of continuous strip-like elements for building tyres, according to
claim 9. - In at least one of the aforesaid aspects, one or more of the following preferred embodiment solutions can also be employed.
- Preferably, the action of modulating the drift forces is carried out in response to transverse movements carried out by the continuous band.
- It is thus possible to optimise the quality of the processing without it being necessary to guide the alignment of the continuous band advancing towards the knives with extreme precision.
- In said generation region, at least one first deviation from the lying plane of the continuous band is preferably imposed to the continuous strip-like elements.
- It is thus possible to move the continuous strip-like elements away from the knives immediately after the execution of the cutting and arrange more space for the housing of the guiding devices.
- In the generation region, 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.
- Preferably the first and the second deviations can be imposed simultaneously.
- In the generation region, at least one third deviation towards a lying plane of the continuous band can also be imposed to the continuous strip-like elements.
- Preferably 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 drift forces can be preferably generated by the passage of the continuous strip-like elements against drift rollers.
- The generation of the drift forces can thus be attained by means of structurally simple, inexpensive and highly reliable components.
- More particularly, 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.
- It is thus possible to control the intensity of the drift forces with simple, inexpensive and highly reliable components.
- The action of modulating the drift forces can be carried out in response to a notification signal.
- Thus, the timeliness of operation is facilitated for the purpose of correcting the drift forces.
- More particularly, 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.
- In such a manner, a constant control of the correct position of the continuous strip-like elements is attained, facilitating timely correction operations.
- 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.
- Preferably, said pairs of continuous strip-like elements are generated in succession starting from outer side edges of the continuous band.
- In such a manner, an effective generation and separation of the continuous strip-like elements from the continuous band is attained.
- The action of correcting the relative positioning between the continuous band and the knives during translation of the continuous strip-like elements can also be provided.
- It is thus possible to restore the correct execution of the cutting in case of malfunctioning.
- Said corrections are preferably carried out by imposing transverse movements to said knives with respect to the drift rollers against which the continuous strip-like elements pass.
- The correction of the relative positioning between the continuous band and the knives is therefore attainable with simple and reliable equipment.
- The transverse movements can be preferably actuated by means of an actuating arm that is disengaged from the cutting unit when correction has occurred.
- A precise execution of the cutting is thus facilitated. Indeed, the cutting unit disengaged from the actuating arm is facilitated in following the spontaneous transverse movements of the continuous band.
- 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.
- Preferably each continuous strip-like element is collected on a respective reel separately from the other continuous strip-like elements.
- Preferably said continuous band is fed at a speed included between about 1 m/s and about 3 m/s.
- Still more preferably 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. Preferably 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.
- Preferably each drift roller can have an operative surface with convex profile operating in contact relationship on the respective continuous strip-like element.
- Preferably, 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.
- Such inclination facilitates the generation of the desired drift forces.
- For each continuous strip-like element produced by the cutting unit, 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.
- In a preferred embodiment, 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.
- Thus, excellent accuracy can be attained in regulating the intensity of the drift forces, since high angular rotations of the first threaded element correspond with micrometric movements of the drift roller around the correction axis.
- 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.
- In one embodiment, 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.
- In a preferred embodiment, 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.
- Preferably the knives are removably fixed on a support block removably fixed to the carriage.
- Preferably the support block is positioned along a direction substantially parallel to the extension of a cutting edge of each knife.
- Preferably 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 can also be provided for imposing transverse movements to the knives.
- The thrust devices are preferably actuatable from outside said generation region.
- The thrust devices can comprise an actuating arm acting on a carriage carrying said knives.
- The thrust devices can comprise an actuating arm acting on the cutting unit.
- Preferably, the actuating arm is removably engageable with the cutting unit.
- In a preferred embodiment, 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.
- Further characteristics and advantages will be clearer from the detailed but not exclusive description of a preferred embodiment of a process and a production line for controlled collection of continuous strip-like elements for building tyres, according with the present invention. Such description will be set forth hereinbelow with reference to the enclosed drawings, provided only as a non-limiting example, in which:
-
figure 1 schematically shows, in plan view, a production line obtained in accordance with the present invention; -
figure 2 shows a detail of the production line in top view, highlighting a transition zone circumscribing the cutting unit; -
figure 3 shows a detail offigure 2 in side view; -
figure 4 shows the cutting unit in perspective view; -
figure 5 shows, in interrupted perspective view, a continuous strip-like element obtainable by means of the present invention. - With reference to the abovementioned figures, 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 infigure 5 , comprising a plurality of reinforcingcords 3, e.g. made of textile, synthetic and/or metallic material. The reinforcingcords 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 rawelastomeric material 4. - Each continuous strip-
like element 2 is adapted to be used for the purpose of building tyres for vehicle wheels. For example, 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 acontinuous band 6 of elastomeric material, comprising said reinforcingcords 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 comprisecord feeding devices 7 which feed the reinforcingcords 3. Thecord feeding devices 7 can for example comprise at least onecreel 8 which sustains a plurality ofpackages 8a; from each of the latter, one of the reinforcingcords 3 is drawn to be used for the purpose of forming the continuous strip-like elements 2. - The reinforcing
cords 3 coming from thecreel 8 are conducted along paths mutually converging towards anextruder 9 fed with raw elastomeric material. It is preferably provided that the reinforcingcords 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 agear pump 11. The elastomeric material can reach thegear pump 11 upon action of a worm screw operatively housed in theextruder 9, upstream of the gear pump itself. - Inside the extrusion die 10, the raw elastomeric material is applied onto the reinforcing
cords 3 longitudinally translating through the die itself. The reinforcingcords 3 exit from the extrusion die 10 along mutually parallel and coplanar trajectories; thecords 3 are covered with thelayer 4 formed by the raw elastomeric material with which they have come into contact, to form the aforesaidcontinuous band 6. - The
continuous band 6 can be subjected to the action of atensioning unit 12, which drives the reinforcingcords 3 and the elastomeric material through the extrusion die 10 as a result of a traction action applied to the continuous band itself. - At the
tensioning unit 12 or in a zone upstream and/or downstream thereof, a cooling action can also be carried out for thecontinuous 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 thecontinuous band 6 in its entirety. - Downstream of the
tensioning unit 12, astorage unit 13 can be provided that defines a winding circuit capable of storing a section of suitable length of thecontinuous band 6 coming from thetensioning unit 12. - In a per se known manner and hence not further described herein, the winding circuit defined in the
storage unit 13 has a length that can be modulated in response to possible variations of productivity of thecontinuous band 6 by theband feeding devices 5, and/or to varied requirements ofcontinuous band 6 downstream of thesame storage unit 13. Thus, 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 thesame storage unit 13. - Preferably the
continuous band 6 is fed at a speed included between about 1 m/s and about 3 m/s. - Still more preferably 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 cuttingunit 14, and guidingdevices 28. - Preferably said generation region "Z" is obtained in a space with prismatic conformation.
- Preferably 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 asupport structure 23 engaging the drive devices themselves. - Cutting
unit 14, guidingdevices 28,adjustment devices 30,drive devices 33 andsupport structure 23 are more precisely described hereinbelow. - Preferably downstream of the
storage unit 13, said cuttingunit 14 slidably engages thecontinuous band 6 in order to divide it into a plurality of continuous strip-like elements 2, each comprising a predetermined number of reinforcingcords 3. - A
drive unit 15 situated downstream of the cuttingunit 14 operates on each of the continuous strip-like elements 2 for assuring the successive movement thereof to the cuttingunit 14 itself. - Downstream of the
drive unit 15, the continuous strip-like elements 2 are collected separately from each other by means of at least onecollection unit 16, which in a preferred solution comprises a plurality ofreels 17 each dedicated to the winding of a respective continuous strip-like element 2. - The cutting
unit 14 comprisesn knives 18 carried by acarriage 19 and operating through thecontinuous 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 thecontinuous band 6, preferably defining a V-shaped configuration with vertex facing thecollection unit 16. - Preferably the
knives 18 of each pair are symmetrically disposed relative to a longitudinal mid-line "L" of thecontinuous band 6. - In a preferred embodiment, 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 thecontinuous band 6. - It is thus conveniently possible to carry out the cutting action simultaneously along the respectively opposite edges of the
continuous band 6, in order to form pairs of continuous strip-like elements 2. Conveniently, the pairs of continuous strip-like elements 2 are generated in succession starting from outer side edges of thecontinuous band 6 itself. - In a different preferred embodiment (not shown), at the vertex of the V-shaped configuration, a pair of
knives 18 is provided. In such embodiment solution, the continuous strip-like element 2 that comes to be generated in central position continues straight and the cuttingunit 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 ofknives 18 employed. - Preferably, the
knives 18 are individually and removably fixed torespective abutment seats 20 provided on thecarriage 19, each by means of a respectiveknife locking member 20a. The abutment seats 20 can be conveniently obtained on asupport block 21 removably fixed to thecarriage 19 by means of ablock locking member 22, and positionable along a direction substantially parallel to the extension of acutting edge 18a of eachknife 18. By adjusting the position of thesupport block 21, it is therefore possible to simultaneously move all theknives 18, along therespective cutting edges 18a, and arrange them in different positions relative to a lying plane "P" of thecontinuous band 6, so that different portions of thecutting edge 18a of eachknife 18 are successively placed in interference relationship with the advancement of the continuous band itself. In other words, it is possible to modify the position of theknives 18 in order to subject thecontinuous band 6 to the action of a new portion of thecutting edge 18a of eachknife 18, for example when the previously used portion is worn. Eachknife 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 thecutting edge 18a to thecontinuous band 6. - Preferably, the cutting
unit 14 is freely movable in a direction transverse to the longitudinal translation direction "F" of thecontinuous band 6. For such purpose, thecarriage 19 can be provided slidably mounted on a fixedsupport structure 23. For example, thesupport structure 23 can haveguide bars 24 that are transverse relative to a longitudinal extension direction of thecontinuous band 6, slidably traversingguide bushings 25 carried by thecarriage 19. - The cutting
unit 14 slidably engages thecontinuous band 6 at acentring guide 26. - More particularly the
centring guide 26, preferably carried by thecarriage 19, engages thecontinuous band 6 at apassage opening 27 having width equal to the width of thecontinuous band 6 itself. Thecontinuous band 6 can thus maintain a centred positioning with respect to theknives 18. Possible lateral movements of thecontinuous band 6 coming from theband feeding devices 5 are indeed easily followed by corresponding lateral translations induced to thecarriage 19. The engagement of thecontinuous band 6 through thecentring guide 26 in fact transmits transverse thrust forces to the cuttingunit 14, due to the same transverse movements of thecontinuous band 6. - Said guiding
devices 28 are housed inside said generation region "Z" containing the cuttingunit 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 therespective knives 18. - More particularly, the guiding
devices 28 comprisedrift rollers 29, each of which adapted to operate in contact relationship with one of the continuous strip-like elements 2, preferably by means of anoperative surface 29a with convex profile. - Preferably, for each continuous strip-
like element 2 produced by the cuttingunit 14, at least twodrift rollers 29 are provided which are mutually aligned along a trajectory diverging from the longitudinal mid-line "L" of thecontinuous band 6. - Preferably, 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 thedrift roller 29 itself. The passage of the continuous strip-like elements 2 against thedrift 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 theknives 18; such trajectories diverging with respect to each other and/or with respect to thecontinuous band 6. - More particularly, 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 thecontinuous band 6, subsequent to the cutting action of therespective knives 18, and a second deviation opposite the first, i.e. directed laterally relative to the longitudinal extension direction of thecontinuous band 6. The first and the second deviations can also be carried out simultaneously, as components of a single oblique deviation. - 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 thecontinuous band 6. The continuous strip-like elements 2 are conveniently disposed coplanar to each other upon reaching thedrive unit 15. - The size of the drift forces can be modulated by means of
adjustment devices 30 associated with the guidingdevices 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 thecontinuous band 6 by various factors that are hard to predict or control, which for example are displayed at theband feeding devices 5 or other zones upstream of the cuttingunit 14; such lateral movements are in fact followed by the lateral mobility of thecarriage 19, but cause relative movements between theknives 18 and thesingle 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 therespective drift rollers 29. - For such purpose, each
drift roller 29 can be conveniently supported by arod 31 rotatably engaged through abase plate 32 carried by thesupport structure 23 of the cuttingunit 14. More particularly, eachrod 31 is rotatable around a correction axis "Y", perpendicular to the rotation axis "X" of the roller itself, upon actuation ofdrive members 33 situated externally of the aforesaid region of generation "Z" of continuous strip-like elements 2. - The
drive members 33 comprise, for eachdrift roller 29, at least one first threadedelement 34, e.g. a ring nut, rotatably engaged with thesupport structure 23 of the cuttingunit 14, externally with respect to the aforesaid generation region "Z" containing the cuttingunit 14. - The first threaded
element 34, axially fixed with respect to thesupport structure 23, operates on atransmission lever 35 associated with therespective rod 31. Thetransmission lever 35 for example comprises adrive arm 36 operatively constrained, e.g. by a ball joint 37, to alever 38 engaged with one end of therespective rod 31 by means of aclamp 39, so as to project radially with respect to the aforesaid correction axis "Y". - The first threaded
element 34 operatively engages a second threadedelement 40, represented for example by a thread carried by thedrive arm 36. - By driving the first threaded
element 34 in rotation, it is thus possible to orient the positioning of therespective drift roller 29 around the correction axis "Y", so as to actuate a fine adjustment of the drift forces induced by thesame drift roller 29 on the continuous strip-like element 2. - 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 theknives 18. An operator can in fact manually operate on the first threadedelements 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. - In order to facilitate a timely operation by the operator, 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 comprisesensor 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". - In an
electronic control unit 43, preferably programmable, a theoretical reference position is stored of the diverging stretch of each of the continuous strip-like elements 2. Acomparator 44 associated with theelectronic control unit 43 compares the position detected by thesensor members 42 with the preset theoretical reference position. - When the difference between the position of the diverging stretch and the theoretical reference position exceeds a predetermined tolerance threshold, the emission of the notification signal is enabled by the signalling
devices 41. - In a preferred embodiment, at least one actuator (not shown) acts on each first threaded
element 34 by automatically adjusting the orientation of thecorresponding drift roller 39 around the aforesaid correction axis "Y" following an output signal of saidelectronic control unit 43. - The cutting action of each
knife 18 is exerted between two contiguous reinforcingcords 3 of thecontinuous band 6, in a manner such that each continuous strip-like element 2 has a predetermined number of reinforcingcords 3. - Nevertheless, it may occur that due to uncontrolled movements of the
continuous band 6 with respect to theknives 18 during manufacturing at high speed, one or more of theknives 18 cuts one of the adjacent reinforcingcords 3 and the system has a new equilibrium condition in which not all of the continuous strip-like elements 2 are formed in accordance with the correct width and/or with the predetermined number of reinforcingcords 3. - In order to remedy the above situation, the cutting
unit 14 can also be associated withthrust devices 45 which, if necessary, are adapted to correcting the relative positioning between thecontinuous band 6 and theknives 18 during translation of the continuous strip-like elements 2, by imposing transverse movements to cuttingunit 14. More particularly, thethrust devices 45 are adapted to be driven from outside the generation region "Z", in order to impose transverse movements to theknives 18 with respect to thedrift rollers 29. - Preferably, the
thrust devices 45 comprise anactuating arm 46 carried by abar 47, preferably with circular section, that is axially and rotatably movable through thesupport structure 23 of thecarriage 19. Acontrol knob 48 carried by thebar 47 allows moving theactuating arm 46 between a rest condition in which it is disengaged from thecarriage 19 and an operative condition in which it engages thecarriage 19. For such purpose, theactuating arm 46 can be provided for example with a fork-like end 49 in which agrip tab 50 carried by thecentring guide 26 is removably insertable. - In normal functioning conditions of the production line 1, the
actuating arm 46 is maintained in rest condition, disengaged from thecarriage 19. When a correction operation is required, an operator can intervene on thecontrol knob 48 in order to bring theactuating arm 46 in engagement relationship with thecarriage 19, and transmit small strikes or thrust actions to the carriage itself, so as to impose sudden transverse movements to theknives 18. - These transverse movements cause a movement of the
continuous band 6 with respect to theknives 18, due to the reactions induced by the continuous strip-like elements 2 translating in engagement relationship on thedrift rollers 29, so as to restore the correct position of the latter with respect to theknives 18.
Claims (15)
- A process for controlled collection of continuous strip-like elements (2) for building tyres, comprising:feeding a continuous band (6) of elastomeric material comprising reinforcing cords (3);in a region of generation (Z) of continuous strip-like elements (2), cutting by knives (18) said continuous band (6) generating continuous strip-like elements (2);in said generation region (Z) of continuous strip-like elements (2), applying drift forces to each of said continuous strip-like elements (2) to guide them along diverging trajectories;modulating said drift forces by drive members (33) placed externally of said generation region (Z) of continuous strip-like elements (2);collecting each continuous strip-like element (2), characterized in that it further comprises the action of laterally translating a carriage (19) carrying said knives (18) for following transverse movements of the continuous band (6), wherein the action of translating the carriage (19) takes place by effect of transverse thrust forces induced by transverse movements of the continuous band (6).
- A process as claimed in claim 1, wherein in said generation region (Z), at least one first deviation from the lying plane ("P") of the continuous band (6), a second deviation directed laterally relative to the longitudinal extension direction of the continuous band (6), and at least one third deviation towards a lying plane (P) of the continuous band (6) are imposed to the continuous strip-like elements (2), wherein said continuous strip-like elements (2), following the third deviation, are brought into mutual-coplanarity relationship.
- A process as claimed in one or more of the preceding claims, wherein said drift forces are generated by passage of the continuous strip-like elements (2) against drift rollers (29), wherein the action of modulating the drift forces is carried out by rotating at least one of said drift rollers (29) around a correction axis (Y) perpendicular to a rotation axis (X) thereof.
- A process as claimed in one or more of the preceding claims, wherein the cutting action is carried out simultaneously along the respectively opposite edges of the continuous band (6) for generating pairs of continuous strip-like elements (2).
- A process as claimed in claim 4, wherein said pairs of continuous strip-like elements (2) are generated in succession starting from outer side edges of the continuous band (6).
- A process as claimed in claim 1, further comprising the action of correcting the relative positioning between the continuous band (6) and the knives (18) during translation of the continuous strip-like elements (2).
- A process as claimed in claim 6, wherein
said corrections are carried out by imposing transverse movements to said knives (18) relative to drift rollers (29) against which the continuous strip-like elements (2) pass. - A process as claimed in claim 7, wherein said transverse movements are carried out by an actuating arm (46) that is disengaged from the cutting unit (14) when correction has occurred.
- A production line for controlled collection of continuous strip-like elements (2) for building tyres, comprising:band feeding devices (5) for feeding a continuous band (6) of elastomeric material comprising reinforcing cords (3);a cutting unit (14) slidably engaging said continuous band (6) and carrying knives (18) operating through the continuous band (6) for generating continuous strip-like elements (2) therefrom;guiding devices (28) operating on said continuous strip-like elements (2) to impart respective drift forces, guiding them along mutually diverging trajectories;adjustment devices (30) for modulating said drift forces on said continuous strip-like elements (2);at least one collection unit for collecting each continuous strip-like element (2);wherein said adjustment devices (30) can be operated by drive members (33) disposed externally of a generation region (Z) of said continuous strip-like elements (2),characterized in that the knives (18) are carried by a carriage (19) movable in a direction transverse to the feeding direction of the continuous band (6), wherein the cutting unit (14) comprises a centring guide (26) operatively engaging the continuous band (6) for maintaining a centred positioning of the latter relative to said knives (18), said production line further comprising thrust devices (45) for imposing transverse movements to the knives (18).
- A production line as claimed in claim 9, wherein the guiding devices (28) comprise drift rollers (29) provided for operating in contact relationship with said continuous strip-like elements (2), wherein each drift roller (29) is rotatably supported according to a rotation axis ("X") inclined to a direction perpendicular to a longitudinal extension direction of a stretch of the continuous strip-like element (2) upstream of the drift roller (29)itself.
- A production line as claimed in claim 9 or 10, wherein each drift roller (29) is positioned around a correction axis (Y) perpendicular to a rotation axis (X) thereof.
- A production line as claimed in one or more of claims 9 to 11, wherein said knives (18) are distributed in respective pairs, mutually spaced along a longitudinal translation direction (F) of the continuous band (6).
- A production line as claimed in one or more of claims 9 to 12, wherein the knives (18) are distributed so as to define a V-shaped configuration with vertex facing the collection unit (16).
- A production line as claimed in one or more of claims 9 to 13, , wherein said thrust devices (45) are drivable from the outside of said generation region (Z) and .
- A production line as claimed in one or more of claims 9 to 14, wherein the thrust devices (45) comprise an actuating arm (46) carried by a bar (47) that is axially movable for imposing a transverse movement to the cutting unit (14).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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EP18201771.5A EP3453642B1 (en) | 2012-04-26 | 2013-04-22 | Process and production line for controlled collection of continuous strip-like elements for building tyres |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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ITMI20120691 | 2012-04-26 | ||
US201261642123P | 2012-05-03 | 2012-05-03 | |
PCT/IB2013/053162 WO2013160814A2 (en) | 2012-04-26 | 2013-04-22 | Process and production line for controlled collection of continuous strip-like elements for building tyres |
Related Child Applications (1)
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EP18201771.5A Division EP3453642B1 (en) | 2012-04-26 | 2013-04-22 | Process and production line for controlled collection of continuous strip-like elements for building tyres |
Publications (2)
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EP2841360A2 EP2841360A2 (en) | 2015-03-04 |
EP2841360B1 true EP2841360B1 (en) | 2018-10-24 |
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Application Number | Title | Priority Date | Filing Date |
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EP18201771.5A Active EP3453642B1 (en) | 2012-04-26 | 2013-04-22 | Process and production line for controlled collection of continuous strip-like elements for building tyres |
EP13729433.6A Active EP2841360B1 (en) | 2012-04-26 | 2013-04-22 | Process and production line for controlled collection of continuous strip-like elements for building tyres |
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EP18201771.5A Active EP3453642B1 (en) | 2012-04-26 | 2013-04-22 | Process and production line for controlled collection of continuous strip-like elements for building tyres |
Country Status (6)
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EP (2) | EP3453642B1 (en) |
CN (1) | CN104349995B (en) |
AR (1) | AR090839A1 (en) |
MX (1) | MX356303B (en) |
RU (1) | RU2637405C2 (en) |
WO (1) | WO2013160814A2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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NL2018959B1 (en) * | 2017-05-22 | 2018-12-04 | Vmi Holland Bv | Method and assembly for applying a tire component to a drum |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE579746C (en) * | 1929-04-13 | 1933-06-30 | Dunlop Rubber Co | Device for automatic unwinding, measuring and longitudinal cutting of webs of fabric |
US3176566A (en) * | 1961-06-02 | 1965-04-06 | Beloit Eastern Corp | Remotely positioned slitter system |
IT1133242B (en) * | 1980-02-27 | 1986-07-09 | Gd Spa | DEVIATOR FOR TAPES, PARTICULARLY PAPER TAPES |
US4386273A (en) * | 1980-05-01 | 1983-05-31 | The B. F. Goodrich Company | Positioner and slitter for laminar material |
JPS59212348A (en) * | 1983-05-17 | 1984-12-01 | Kataoka Kikai Seisakusho:Kk | Device for splitting and sorting sheet |
IT1199385B (en) * | 1984-02-23 | 1988-12-30 | Gd Spa | FEEDING DEVICE FOR TAPES OF WRAPPING MATERIAL TO A CIGARETTE PACKAGING MACHINE OF THE DOUBLE WAY TYPE |
JPS60202057A (en) * | 1984-03-22 | 1985-10-12 | Sumitomo Rubber Ind Ltd | Cutting device for rubber-coated steel cord cloth |
DE8717253U1 (en) * | 1987-01-15 | 1988-06-23 | Benz & Hilgers GmbH, 40470 Düsseldorf | Device for deflecting and lateral deflection of various strips produced from a material web, for example a paper web, by longitudinal cutting |
DE3733129C2 (en) * | 1987-10-01 | 1999-02-18 | Focke & Co | Device for separating a material web into two partial webs |
JPH064234B2 (en) * | 1990-07-16 | 1994-01-19 | 明産株式会社 | NC device such as NC slitter device |
DE10044577A1 (en) * | 2000-09-08 | 2002-03-21 | Hauni Maschinenbau Ag | Method and device for separating a double-width starting wrapping material web into two partial webs |
DE10110494C1 (en) * | 2001-02-14 | 2002-12-05 | Lohmann Therapie Syst Lts | Thin wafer manufacture from an active film involves slitting film into long strips which are stacked and smoothed before cross-cutting to length |
ITMI20041669A1 (en) * | 2004-08-26 | 2004-11-26 | S I A T Societa Internaz | METHOD AND MACHINE FOR CUTTING A SELF-ADHESIVE TAPE IN A MULTIPLE OF THIN TAPES AND FOR THEIR REWINDING. |
DE102009008936A1 (en) * | 2009-02-13 | 2010-08-26 | Khs Ag | Cutting and expanding device for cutting web of packaging material, has web inlet for supplying packing material to device, where multiple individual webs are conveyed away from device at web outlet |
DE102010051481A1 (en) * | 2010-11-15 | 2012-05-16 | Rolf Hessenbruch | Apparatus for separating web, has spreader roller that spreads longitudinal cuts in web at constant spreading effect, and generates gap in web |
CN202138903U (en) * | 2011-06-17 | 2012-02-08 | 中烟机械技术中心有限责任公司 | A paper feeding apparatus for regularly spaced online slitting of paper tapes |
-
2013
- 2013-04-22 EP EP18201771.5A patent/EP3453642B1/en active Active
- 2013-04-22 RU RU2014147476A patent/RU2637405C2/en active
- 2013-04-22 MX MX2014012827A patent/MX356303B/en active IP Right Grant
- 2013-04-22 EP EP13729433.6A patent/EP2841360B1/en active Active
- 2013-04-22 WO PCT/IB2013/053162 patent/WO2013160814A2/en active Application Filing
- 2013-04-22 CN CN201380028201.6A patent/CN104349995B/en active Active
- 2013-04-25 AR ARP130101387A patent/AR090839A1/en active IP Right Grant
Non-Patent Citations (1)
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RU2637405C2 (en) | 2017-12-04 |
MX356303B (en) | 2018-05-22 |
RU2014147476A (en) | 2016-06-20 |
WO2013160814A2 (en) | 2013-10-31 |
CN104349995B (en) | 2016-10-12 |
MX2014012827A (en) | 2015-02-10 |
WO2013160814A3 (en) | 2014-03-27 |
CN104349995A (en) | 2015-02-11 |
EP2841360A2 (en) | 2015-03-04 |
AR090839A1 (en) | 2014-12-10 |
EP3453642B1 (en) | 2020-11-18 |
EP3453642A1 (en) | 2019-03-13 |
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