PROCESS AND PLANT FOR BUILDING TYRES FOR VEHICLE WHEELS

Abstract

A plant for building tyres for vehicle wheels, includes a sleeve building area in which devices for obtaining carcass sleeves operate, a crown building area in which devices for obtaining crown structures operate and a shaping station for shaping each carcass sleeve according to a toroidal configuration. Transfer devices for transferring the carcass sleeves from the sleeve building area to the shaping station, by means of a first translator configured for picking up each carcass sleeve from an outlet station of the sleeve building area, a second translator configured for releasing each carcass sleeve in the shaping station, and a storage device operatively interposed between said first translator and second translator.

Claims

1-46. (canceled)

47. A process for building tyres for vehicle wheels, comprising: transferring carcass sleeves obtained in a sleeve building area to a shaping station where each carcass sleeve is shaped according to a toroidal configuration, in order to be associated with a respective crown structure obtained in a crown building area, wherein each carcass sleeve picked up from the sleeve building area, before being carried to the shaping station, transits through a storage device arranged to receive a plurality of said carcass sleeves, and wherein each carcass sleeve is engaged on and picked up from the storage device, respectively at a load station and a pick-up station, angularly spaced from each other around a rotation center of the carcass sleeves carried by the storage device.

48. The process as claimed in claim 47, wherein each carcass sleeve is engaged with the storage device by means of insertion of a support element in said carcass sleeve.

49. The process as claimed in claim 48, wherein insertion of the support element is preceded by an action of alignment of the carcass sleeve with a geometric axis thereof substantially aligned with the support element.

50. The process as claimed in claim 48, wherein insertion of the support element is executed by means of longitudinal translation of the support element parallel to a geometric axis of the carcass sleeve.

51. The process as claimed in claim 47, wherein each carcass sleeve picked up from the sleeve building area is moved toward the storage device along a first transfer path lying in a vertical plane.

52. The process as claimed in claim 51, wherein the lying plane of the first transfer path is aligned with a load station of the storage device.

53. The process as claimed in claim 51, wherein each carcass sleeve is picked up from the storage device and moved toward the shaping station along a second transfer path lying in a vertical plane.

54. The process as claimed in claim 53, wherein the lying plane of the second transfer path is aligned with a pick-up station of the storage device.

55. The process as claimed in claim 53, wherein the lying planes of the first transfer path and second transfer path are respectively orthogonal.

56. The process as claimed in claim 52, wherein the second transfer path is extended substantially according to an L-shaped configuration above the shaping station.

57. The process as claimed in claim 51, wherein the first transfer path is extended substantially astride a service area configured for being occupied by an operator.

58. The process as claimed in claim 57, wherein said storage device has at least one manual loading station accessible from said service area.

59. The process as claimed in claim 51, wherein each carcass sleeve picked up from the sleeve building area, before being moved along the first transfer path, is translated from an outlet station to an alignment position respectively offset along a direction orthogonal to the lying plane of the first transfer path.

60. The process as claimed in claim 47, wherein each carcass sleeve picked up from the sleeve building area is supported by means of an action of radial containment distributed over an external surface thereof.

61. The process as claimed in claim 47, wherein each carcass sleeve picked up from the storage device is supported by means of an action of radial containment distributed over an external surface thereof.

62. The process as claimed in claim 47, wherein, in the shaping station, a forming drum is internally coupled to each shaped carcass sleeve.

63. The process as claimed in claim 53, wherein each forming drum coupled to the carcass sleeve, is picked up from the shaping station and transferred into the crown building area in order to obtain said crown structure.

64. A plant for building tyres for vehicle wheels, comprising: a sleeve building area in which devices for obtaining carcass sleeves operate; a crown building area in which devices for obtaining crown structures operate; a shaping station for shaping each carcass sleeve according to a toroidal configuration; and transfer devices for transferring the carcass sleeves from the sleeve building area to the shaping station, wherein said transfer devices comprise: a first translator configured for picking up each carcass sleeve from an outlet station of the sleeve building area and transferring said each carcass sleeve to a load station at a storage device; and a second translator configured for transferring each carcass sleeve from a pick-up station at said storage device to the shaping station, wherein said storage device is operatively interposed between said first translator and second translator; and wherein the load station and the pick-up station are angularly spaced from each other around a rotation center of the carcass sleeves carried by the storage device.

65. The plant as claimed in claim 64, wherein the storage device has a plurality of support elements simultaneously translatable around a common rotation center.

66. The plant as claimed in claim 65, wherein each support element can be selectively positioned at least at said load station and at said pick-up station.

67. The plant as claimed in claim 65, wherein said storage device comprises movement members operating at at least one of said load station and pick-up station, in order to translate each support element between an extracted condition in which said each support element is radially moved away from the rotation center and a contracted condition in which said each support element is moved close to the rotation center.

68. The plant as claimed in claim 67, wherein said movement members comprise a slide guide extended around the rotation center.

69. The plant as claimed in claim 68, wherein said slide guide is extended eccentrically with respect to the rotation center.

70. The plant as claimed in claim 68, wherein said slide guide is slidably engaged by sliders, each carried by one of said support elements.

71. The plant as claimed in claim 64, wherein each support element is slidably engaged on a radial arm extended from a rotatable support coaxial with the rotation center.

72. The plant as claimed in claim 68, wherein said movement members comprise an actuator operating on a pusher that is radially movable with respect to the rotation center.

73. The plant as claimed in claim 72, wherein a portion of the slide guide is obtained in said pusher.

74. The plant as claimed in claim 64, wherein said first translator comprises a first grip member movable along a vertical direction and along a horizontal direction along a first transfer path lying in a vertical plane.

75. The plant as claimed in claim 64, wherein said first translator comprises: a first guide beam extended horizontally in raised position between the sleeve building area and the storage device; a first carriage movable along the first guide beam; a first column slidably engaged with the first carriage and vertically movable; and a first grip member engaged in proximity to a lower end of the first column.

76. The plant as claimed in claim 74, wherein the lying plane of the first transfer path is aligned with a load station of the storage device.

77. The plant as claimed in claim 74, wherein said second translator comprises a second grip member movable in a vertical direction and a horizontal direction along a second transfer path lying in a vertical plane.

78. The plant as claimed in claim 77, wherein said second translator comprises: a second guide beam extended horizontally in raised position with respect to the storage device and above the shaping station; a second carriage movable along the second guide beam; a second column slidably engaged with the second carriage and vertically movable; and a second grip member engaged in proximity to a lower end of the second column.

79. The plant as claimed in claim 77, wherein the lying plane of the second transfer path is aligned with a pick-up station of the storage device.

80. The plant as claimed in claim 77, wherein the lying planes of the first transfer path and second transfer path are respectively orthogonal.

81. The plant as claimed in claim 64, wherein the storage device is arranged in raised position with respect to the shaping station.

82. The plant as claimed in claim 74, wherein the sleeve building area and the crown building area are respectively side-by-side according to a direction parallel to the lying plane of the first transfer path, within a rectangular perimeter line.

83. The plant as claimed in claim 82, wherein a service area, configured for being occupied by at least one operator, is internally arranged along one side of said perimeter line and delimited between said sleeve building area and crown building area.

84. The plant as claimed in claim 64, wherein the shaping station is positioned within the crown building area.

85. The plant as claimed in claim 75, wherein the first guide beam is extended above a service area configured for being occupied by an operator.

86. The plant as claimed in claim 64, wherein each support element can also be positioned at at least one manual loading station.

87. The plant as claimed in claim 75, wherein the first grip member is carried by an oscillating arm rotatably engaged in proximity to the lower end of the first column according to an oscillation axis parallel to the first guide beam.

88. The plant as claimed in claim 77, wherein at least one of said first grip member and second grip member comprises at least two shells, mutually approachable in order to exert an action of radial containment on an external surface of the carcass sleeve.

89. The plant as claimed in claim 88, wherein each of said shells has a substantially semi-cylinder shape.

90. The plant as claimed in claim 64, wherein movement members and control units configured for translating the support elements around the rotation center are mounted on fixed parts of the storage device, with no movement members and/or control units mounted on the support elements or other parts movable around said rotation center.

91. The plant as claimed in claim 64, further comprising forming drums that can be engaged in the shaping station, each within a respective shaped carcass sleeve.

92. The plant as claimed in claim 64, wherein, the crown building area comprises movement devices operating on the single forming drums in order to move the shaped carcass sleeves between second work stations distributed in the crown building area.

Description

[0093] Such description will be set forth hereinbelow with reference to the enclosed drawings, provided only as a non-limiting example, in which:

[0094] FIG. 1 schematically shows a top view of a plant for building tyres;

[0095] FIG. 2 shows a detail of FIG. 1 in enlarged scale;

[0096] FIG. 3 laterally shows the detail of FIG. 2;

[0097] FIG. 4 shows a detail of the plant, indicating a first translator in side view;

[0098] FIG. 5 shows a detail of the plant, indicating a second translator in side view;

[0099] FIG. 6 shows a tyre that can be obtained in accordance with the present invention, in interrupted radial section.

[0100] With reference to the abovementioned figures, reference number 1 overall indicates a plant for building tyres for vehicle wheels. The plant 1 is arranged for actuating a process for building tyres for vehicle wheels, in accordance with the present invention.

[0101] The plant 1 is set for obtaining tyres 2 (FIG. 6) essentially comprising at least one carcass ply 3 preferably internally covered by a layer of impermeable elastomeric material or so-called liner 4. Two anchoring annular structures 5, each comprising a so-called bead core 5a preferably carrying an elastomeric filler 5b in radially external position, are engaged with respective end flaps 3a of the carcass ply/plies 3. The anchoring annular structures 5 are integrated in proximity to zones normally identified with the name “beads” 6, at which the engagement between the tyre 2 and a respective mounting rim (not depicted) normally occurs.

[0102] Around the carcass ply/plies 3, a crown structure 7 is circumferentially applied, for example comprising one or more belt layers 7a,7b and a tread band 8 circumferentially superimposed on the belt layers 7a,7b. Two sidewalls 9, each extended from the corresponding bead 6 to a corresponding lateral edge of the tread band 8, are applied in laterally opposite positions on the carcass ply/plies 3.

[0103] The plant 1 is preferably delimited within a preferably closed perimeter line L, having a rectangular-plan extension. Within the perimeter line L, a sleeve building area A and a crown building area B are identifiable, respectively side-by-side. The sleeve building area A and the crown building area B occupy a main portion, approximately comprised between 70% and 90%, of the surface inscribed in the perimeter line L. A service area C, configured for being occupied by at least one operator O, is internally arranged along one side of the perimeter line L, preferably in substantially central position, and delimited between the sleeve building area A and the crown building area B. In the illustrated example, the service area C occupies about 20%, approximately from 10% to 30%, of the surface inscribed in the perimeter line L.

[0104] In the sleeve building area A, one or more building drums 10 are moved according to a pre-established sequence, through a plurality of first work stations 11, e.g. according to known modes, in order to form on the building drum itself a carcass sleeve 12 having substantially cylindrical shape. The carcass sleeve 12 can for example comprise said at least one carcass ply 3, preferably internally covered by the liner 4, and having the respective axially opposite end flaps 3a engaged, e.g. by turning-up, with the respective anchoring annular structures 5. If necessary, the carcass sleeve 12 can also comprise the sidewalls 9 or first portions thereof, each extended starting from a respective bead 6.

[0105] In the crown building area B, second work stations 13 are distributed for obtaining the crown structures 7, and each of these can for example comprise the belt layer or layers 7a, 7b, the tread band 8 and possibly at least one part of the sidewalls 9.

[0106] It is provided that each carcass sleeve 12 is transferred into a shaping station 14 where, for example in a known manner, it can be shaped according to a toroidal configuration for the purpose of coupling with the respective crown structure 7.

[0107] In accordance with a non-illustrated embodiment, each crown structure 7 can be obtained on a respective auxiliary drum, from which it must be removed in order to be coupled to a respective carcass sleeve 12.

[0108] In accordance with a different preferred embodiment, each crown structure 7 can be advantageously obtained directly on the respective carcass sleeve 12.

[0109] For such purpose, provision is preferably made such that within each carcass sleeve 12 transferred into the shaping station 14, a forming drum 15 is engaged that is radially expandable within the shaped carcass sleeve 12.

[0110] The shaping station 14 can be situated inside the crown building area B. Movement devices 16, comprising for example anthropomorphic robotic arms, operate in the crown building area B in order to sequentially pick up, from the shaping station 14, each forming drum 15 coupled to the respective shaped carcass sleeve 12, and transfer it into the crown building area B, in order to sequentially move it through the second work stations 13. The different components of the crown structure 7 can therefore be obtained according to a desired sequence directly on the respective carcass sleeve 12, suitably shaped and adequately supported by the respective forming drum 15 for the purpose of obtaining the crown structure 7. Preferably, at the end of the work cycle in the crown building area B, each forming drum 15 carrying a respective built green tyre 2 is once again engaged in the shaping station 14. The forming drum 15 is then radially contracted in order to allow the removal of the built tyre 2, for example by an annular transferring device or other unloading devices 17 which remove the built tyre 2 in order to move it away from the shaping station 14. Preferably, each built tyre 2 is released on an unloading conveyor 18 arranged in the service area C.

[0111] Between the sleeve building area A and the shaping station 14, transfer devices 19 are operatively arranged, configured for separately and sequentially transferring the carcass sleeves 12 from the sleeve building area A to the shaping station 14.

[0112] The transfer devices 19 preferably comprise a first translator 20 configured for picking up each carcass sleeve 12 from an outlet station D of the sleeve building area A, a second translator 21 configured for releasing each carcass sleeve 12 in the shaping station 14, and a storage device 22 operatively interposed between the first translator 20 and the second translator 21.

[0113] The first translator 20 has a first guide beam 23 which is extended horizontally, in raised position above the service area C, between the sleeve building area A and the storage device 22. Along the first guide beam 23, a first carriage 24 is slidably engaged, through which a first vertically-movable column 25 is in turn slidably engaged.

[0114] In proximity to a lower end of the first column 25, an oscillating arm 26 is engaged, rotatably according to an axis parallel to the first guide beam 23; such oscillating arm 26 carries a first grip member 27 at one end thereof. The first grip member 27 preferably comprises at least two first shells 27a, mutually approachable in order to exert an action of radial containment on an external surface of the carcass sleeve 12. The first shells 27a preferably have semi-cylinder shape, so as to be adapted to engage the carcass sleeve 12, exerting an action of radial containment on the external surface thereof.

[0115] Suitable actuators, not illustrated, drive the controlled movement of the first carriage 24 along the first guide beam 23 and of the first column 25 through the first carriage 24, according to respectively perpendicular directions, in order to translate the first grip member 27 along a predetermined first transfer path T1, lying in a vertical plane preferably parallel to the direction of mutual side-by-side placement of said sleeve building area A and crown building area B.

[0116] The second translator 21 has a second guide beam 28 extended horizontally in raised position above the storage device 22 and the shaping station 14, preferably according to an orientation perpendicular to the first guide beam 23. Along the second guide beam 28, a second carriage 29 is slidably engaged, through which a vertically-movable second column 30 is in turn slidably engaged.

[0117] In proximity to a lower end of the second column 30, a second grip member 31 is engaged, comprising preferably at least two mutually-approachable second shells 31a. Also the second shells 31a preferably have semi-cylinder shape, so as to be adapted to engage the carcass sleeve 12, exerting an action of radial containment on the external surface thereof.

[0118] Suitable actuators, not illustrated, drive the controlled movement of the second carriage 29 along the second guide beam 28 and of the second column 30 through the second carriage 29, along respectively perpendicular directions, in order to translate the second grip member 31 along a pre-established second transfer path T2, lying in a vertical plane, preferably orthogonal with respect to the lying plane of the first transfer path T1.

[0119] The storage device 22, situated for example in proximity to one angle of the service area C adjacent to the crown building area B and close to the shaping station 14, preferably comprises a tower 32 defining a rotation centre Y along a vertical axis. The tower 32 carries a rotatable support 33 coaxial with rotation centre Y, from which a plurality of angularly-equidistant radial arms 34 are extended. Each radial arm 34 carries a respective support element 35 having an abutment surface on the upper part, with preferably convex shape.

[0120] In the illustrated embodiment, four radial arms 34 are provided, carrying respective support elements 35 angularly spaced 90° from each other. Upon command of an actuator, not illustrated, the rotatable support 33 of the tower 32 can be rotated so as to cause a simultaneous translation of the support elements 35 around the rotation centre Y, preferably according to one or more angular movement pitches having value corresponding to the angular distance between two respectively adjacent support elements 35.

[0121] Consequently, each support element 35 can be selectively positioned at least at a load station E reachable by the first translator 20, and a pick-up station F reachable by the second translator 21. Preferably, the load station E and the pick-up station F are angularly spaced by 90° around the rotation centre Y, each aligned with the lying plane of the respective first and second transfer path T1, T2. Provision is also preferably made for a manual loading station G, accessible from the service area C, and preferably arranged in a diametrically opposite position with respect to the pick-up station F. A possible transit station H can be situated in a position diametrically opposite the load station E, between the pick-up station F and the manual loading station G.

[0122] Preferably the storage device 22, and more precisely the support elements 35 carried by the respective radial arms 34, are situated in raised position with respect to the shaping station 14, but in any case such that the manual load station E can be easily reached by the operator O, possibly by means of a suitable ladder K arranged in the service area C.

[0123] The rotatable support 33 and the parts supported thereby, for example the radial arms 34 and the support elements 35, preferably lack motorised members or other components with electrical, hydraulic or pneumatic operation 2. In other words, movement members and control units configured in order to translate the support elements 35 around the rotation centre Y, not illustrated in the drawings, are mounted only on the tower 32 or other fixed parts of the storage device 22, with no movement members and/or control units mounted on the support elements 35 or other parts movable around the rotation centre Y.

[0124] For the first and the second translator 21 to be able to interact with the storage device 22 without mutually interfering, movement members 36 are preferably provided, operating at at least one of said load station E and pick-up station F, in order to translate each support element 35 between an extracted condition in which it is radially moved away from the rotation centre Y and a contracted condition in which it is moved close to the rotation centre Y. In the illustrated embodiment, the movement members 36 operate at the single load station E.

[0125] More particularly, a plate 37 is fixed close to the top of the tower 32. On one surface of such plate 37, a slide guide 38 is obtained that is extended eccentrically around the rotation centre Y, substantially according to a horizontal plane. For example, the slide guide 38 can be obtained from a groove extended according to a line closed around the rotation centre Y, and having a circular portion extended for about 180° concentrically around the rotation centre Y, and an eccentric portion extended towards the load station E.

[0126] Each support element 35 is slidably engaged along the respective radial arm 34 and, at an end directed towards the rotation centre Y, carries a slider 39, e.g. in roller form, slidably engaged along the slide guide 38.

[0127] The sliders 39 travel along the slide guide 38 during the rotation imposed on the support elements 35 around the rotation centre Y. The engagement between the sliders 39 and the slide guide 38 consequently forces a radial movement to the support element 35 which is moved closer to or away from the load station E. More particularly, during the movement towards the load station E, each support element 35 translates towards the respective extracted condition, in order to return towards the contracted condition when moving away from the load station E itself.

[0128] Additionally or as an alternative, for example in order to increase the distance of the load station E from the rotation centre Y, a portion of the slide guide 38 engaged by the slider 39 of each support element 35 at the load station E can be obtained in a pusher 40 that is radially movable away from the rotation centre Y, upon command of an actuator 41 fixed to the tower 32.

[0129] During the operation of the plant, the building drum or drums 10 carrying the carcass sleeves 12 obtained in the sleeve building area A are separately carried, for example by means of a handling device 42, to the outlet station D, preferably arranged along one side of the sleeve building area A adjacent to the crown building area B and/or to the service area C. The first translator 20 carries the respective first grip member 27 to the outlet station D, in a manner such that the carcass sleeve 12 is coaxially inserted inside the first grip member 27. With a mutual approaching of the first shells 27a, the carcass sleeve 12 is engaged by the first grip member 27 and can therefore be taken off the building drum 10, upon possible radial contraction thereof.

[0130] With a rotation of the oscillating arm 26, e.g. by about 180°, the carcass sleeve 12 retained by the first grip member 27 is carried from the outlet station D to an alignment position D1 parallel and offset with respect to the outlet station D, along a direction orthogonal to the lying plane of the first transfer path T1. Upon reaching the alignment position D1, the carcass sleeve 12 has its geometric axis X-X coplanar with the first transfer path T1.

[0131] The geometric axis X-X of each carcass sleeve 12 coincides with the rotation axis of the respective tyre 2 during production.

[0132] The presence of the oscillating arm 26 on the first translator 20 ensures that the outlet station D may if necessary not be aligned with the load station E on the storage device 22, so as to improve the design flexibility of the plant as a function of the needs.

[0133] The translation of the first column 25 and of the first carriage 24 is then driven, in order to move the carcass sleeve 12 along the first transfer path T1, extended preferably astride the service area C. More particularly, with a translation of the movable first column 25, a lifting of the carcass sleeve 12 is caused up to a height of at least 2100 mm, suitable for preventing risks of collision with the operator O present in the service area C. The movement of the first carriage 24 is then driven, which makes the carcass sleeve 12 carry out a horizontal translation along its geometric axis X-X, above the service area C. A new downward translation of the first column 25 causes an alignment of the carcass sleeve 12 in a manner such that its geometric axis X-X is aligned with the support element 35 arranged in the load station E. A new movement of the first carriage 24 and/or the movement of the support element 35 in the extracted condition is then driven upon command of the actuator 41, if not carried out above, in order cause the insertion of the support element itself within the carcass sleeve 12, parallel to the geometric axis X-X of the latter.

[0134] The first shells 27a can thus be moved away in order to free the carcass sleeve 12, setting it on the support element 35, after which the first grip member 27 is removed from the carcass sleeve 12, which remains engaged to the support element 35 in the load station E.

[0135] The support element 35 is brought back towards the contracted condition upon command of the actuator 41 and, with a translation of the support elements 35 around the rotation centre Y, according to an angle of 90° in anticlockwise sense with respect to the FIG. 1, the carcass sleeve 12 is transferred from the load station E to the pick-up station F.

[0136] Simultaneously, a possible additional carcass sleeve 12, manually loaded by the operator O, is transferred from the manual loading station G to the load station E, ready to be transferred to the pick-up station F with a new translation of the support elements 35 around the rotation centre Y.

[0137] The carcass sleeve 12 carried into the pick-up station F is engaged by the second grip member 31 carried by the translator 21, in a manner analogous to that stated with reference to the first grip member 27.

[0138] The carcass sleeve 12 is therefore adapted to be picked up from the storage device 22 and moved towards the shaping station 14 along the second transfer path T2, extended according to an L-shaped configuration above the shaping station 14. More particularly, with a horizontal translation of the second carriage 29 along the second guide beam 28, the carcass sleeve 12 is removed from the support element 35 in the pick-up station F and carried above the shaping station 14. A subsequent descent of the second column 30 places the carcass sleeve 12 within the shaping station 14.

[0139] The carcass sleeve 12 is then engaged in the shaping station 14, in order to be shaped according to the toroidal configuration required for the purpose of coupling with the crown structure 7 subsequently obtained in the crown building area B.