Method, joint device and retreading assembly for applying a tread around a tyre carcass

Abstract

Method for applying a tread around a carcass using a joining device comprising a lifting element and a first joining member, wherein the method comprises the following steps: a) applying a front end of the tread to an outer peripheral surface of the tyre carcass and subsequently winding the tread around the carcass so that a rear end of the tread overlaps the front end, thereby forming a gap between the rear end and the outer peripheral surface; b) inserting the lifting element in said gap so as to support the rear end of the tread with respect to the outer peripheral surface; c) pressing a terminal portion of the rear end, located between the lifting element and the rear edge, onto the outer peripheral surface of the tyre carcass using the first joining member.

Description

Technical Field

[0001] This invention relates to a method for applying a tread to a tire carcass. It also relates to a bonding device for applying a tread around a tire carcass, particularly for retreading. Furthermore, it relates to a retreading assembly for applying a tread around a tire carcass. Background Technology

[0002] JP2008-001067A discloses a retreading method in which a pre-cured tread is wound around the tire carcass. Subsequently, the front and rear ends of the pre-cured tread are joined.

[0003] More specifically, the tread is wound around the tire carcass in a slightly overlapping manner. The operator then lifts the rear end and manually positions the rear edge of the tread against the corresponding front edge. The front and rear edges are then manually pressed together through a series of sequential steps to ensure a strong bond as the rubber material vulcanizes. Summary of the Invention

[0004] A drawback of the known methods is that the uniformity of the joint between the front and rear ends of the tire is highly dependent on the operator's skill. Furthermore, the positioning and engagement of the rear end is labor-intensive and / or demanding for the operator. Additionally, manual engagement of the front and rear ends can be time-consuming and slow down the process.

[0005] The object of the present invention is to provide a bonding device, retreading assembly and method, wherein the tread can be applied to the tire carcass more efficiently, more reliably and / or more consistently.

[0006] According to a first aspect, the present invention provides a method for applying a tread around the outer peripheral surface of a tire carcass using a coupling device, wherein the outer peripheral surface extends in a circumferential direction about a central axis, and wherein the tread includes an elongated body having a front end terminating at a front edge and a rear end terminating at a rear edge opposite to the front end. The engagement device includes a lifting element that can be inserted between the outer peripheral surface of the tire carcass and the rear end of the tread, and a first engagement member that can move relative to the lifting element in the pressing direction. The method includes the following steps: a) Apply the front end of the tread to the outer peripheral surface of the tire carcass, and then wrap the tread around the carcass so that the rear end of the tread overlaps the front end, thereby creating a gap between the rear end and the outer peripheral surface. b) Insert the lifting element into the gap to support the rear end of the tread relative to the outer peripheral surface; c) When the lifting element supports the rear end in step b), the first engaging member is used to press the end portion of the rear end located between the lifting element and the rear edge onto the outer peripheral surface of the tire carcass.

[0007] By subsequently performing steps b) and c), the distal end portion of the rear end can be bent downwards from the lifting element toward the front edge. The rear edge can then be precisely and / or accurately positioned against the front edge of the tread. Therefore, the joint formed between the rear and front edges can be stronger and / or more reliable. These steps can be performed independently of the operator's skill level. Therefore, the tread can be applied to the tire carcass more reliably and / or more consistently. Furthermore, the rear end of the tread can be applied to the tire carcass more efficiently.

[0008] In one embodiment, the lifting element is inserted into the gap in a lateral direction perpendicular to the pressing direction. In other words, the lifting element can be inserted into the gap in a linear direction.

[0009] In another embodiment, after step c), the method further includes the step d) removing the lifting element from the gap. In other words, the lifting element is removed after the end portion of the rear end has been applied to the tire carcass.

[0010] In one preferred embodiment, after step d), the method further includes the step of: e) pressing the remaining portion of the rear end onto the outer peripheral surface of the tire carcass. Due to the rear end overlap, the tread has a slight over-length. Therefore, after applying the end portion of the rear end, the remaining portion of the rear end may not be reliably attached to the tire carcass. Accordingly, by performing step e), the remaining portion of the rear end can be applied to the tire carcass more reliably.

[0011] In one embodiment, step e) includes pressing a first engaging member against the tire tread at a distance spaced from the rear edge in the circumferential direction, and moving the first engaging member toward the rear edge in the circumferential direction while pressing the remaining portion of the rear end against the outer peripheral surface of the tire carcass. Thus, the same engaging member used to bend and press the end portion of the rear end downwards can be used to reliably apply the remaining portion of the rear end to the tire carcass.

[0012] In an alternative embodiment, the engagement device further includes a second engagement member, and step e) comprises: pressing the second engagement member against the tire tread at a distance spaced from the rear edge in the circumferential direction, and moving the second engagement member circumferentially toward the rear edge while pressing the remaining portion of the rear end against the outer peripheral surface of the tire carcass. By using the second engagement member to perform step e), the first engagement member can securely hold the end portions of the front and / or rear ends while performing step e). Accordingly, accidental displacement of the end portions due to the performance of step e) can be prevented. Therefore, the rear end can be applied to the tire carcass more reliably.

[0013] In another embodiment, step c) further includes pressing the rear edge against the front edge of the tread. This allows for a more reliable engagement between the rear and front edges, consequently improving the quality of the vulcanized tire.

[0014] In another embodiment, the engagement device includes a further lifting element projecting laterally toward the lifting element, wherein step b) includes inserting the lifting element and the further lifting element into the gap from opposite sides to support the rear end of the tread relative to the outer peripheral surface. In other words, the lifting element and the further lifting element can be inserted laterally from opposite sides of the tread between the tire carcass and the rear end. By inserting the lifting elements from opposite sides, accidental displacement of the tread in the lateral direction can be prevented.

[0015] In another embodiment, in step a), the rear end overlaps the front end by two to six millimeters, preferably three to five millimeters. For example, the rear end may overlap the front end by four millimeters. This overlap is sufficient to reliably perform steps b) and c). Furthermore, the overlap may be short enough to prevent excessive length in the remaining portion of the rear end from damaging the adhesion between the tread and the tire carcass.

[0016] In another embodiment, the engagement device further includes a control unit, wherein the control unit is configured to control the engagement device to perform the steps of the method. Therefore, the method can be performed without operator input. Consequently, the tread can be applied more consistently and / or more efficiently around the tire carcass.

[0017] According to a second aspect, the present invention provides a joining device for applying a tread to a tire carcass, particularly to the outer peripheral surface of said tire carcass, wherein the joining device is adapted for use in a method according to a first aspect of the invention, wherein the joining device comprises: - A lifting element for supporting the rear end in a position spaced apart from the tire carcass, wherein in the lifted position, the lifting element can be inserted into the gap between the outer peripheral surface of the tire carcass and the rear end of the tread, and protrudes in the lateral direction. - A first engaging member, which is movable relative to the lifting element in a pressing direction perpendicular to the lateral direction, to press the rear end portion onto the tire carcass, wherein the first engaging member and the lifting element are spaced apart in an engaging direction perpendicular to both the lateral and pressing directions.

[0018] The engagement device is adapted to perform the method of the first aspect of the invention, thus inheriting the advantages mentioned above. Specifically, the lifting element can support the rear end relative to the tire carcass, while the first engagement member can bend the end portion of the rear end toward the tire carcass in the pressing direction. Therefore, the engagement device can precisely and / or accurately apply said end portion of the rear end to the tire carcass. Accordingly, the engagement device can more consistently and / or more reliably apply at least the rear end of the tread to the tire carcass.

[0019] In one embodiment, the lifting element is movable relative to the first engaging member from a waiting position toward or into a lifting position to insert the lifting element into the gap between the outer peripheral surface of the tire carcass and the rear end of the tread. Therefore, the base can remain stationary when the lifting element is inserted between the tire carcass and the tread. Consequently, the lifting element can be inserted more accurately and / or more efficiently between the tire carcass and the rear end.

[0020] In another embodiment, the lifting element is linearly movable in a lateral direction from a waiting position to a lifted position. Preferably, the lateral direction extends parallel to the central axis of the tire carcass. Accordingly, the lifting element can be inserted in or substantially in the direction of the gap between the tire carcass and the rear end. Thus, the lifting element can be accurately inserted into said gap. Alternatively, the lifting element can, for example, pivot from the waiting position to the lifted position.

[0021] In one embodiment, the engagement device includes a first actuator or first driver for moving the lifting element in a lateral direction. The driver can move the lifting element from a waiting position to a lifting position. Preferably, the first driver is a linear driver, such as a spindle driver or a pneumatic cylinder.

[0022] In another embodiment, the lifting element is tapered. More specifically, the lifting element is tapered in the lateral direction. Therefore, by inserting the lifting element laterally between the tire carcass and the rear end, the lifting element can lift the rear end of the tread from the front end. Accordingly, the lifting element does not need to be displaced in the radial direction of the tire carcass to lift the front end of the tread. Therefore, the engagement device can be designed to be simpler.

[0023] In another embodiment, the engagement device includes a further lifting element projecting laterally toward the lifting element, wherein the further lifting element can be inserted between the outer peripheral surface of the tire carcass and the rear end of the tread for lifting the rear end from the tire carcass. In other words, the lifting element and the further lifting element can be inserted laterally between the tire carcass and the rear end from opposite sides of the tread. By inserting the lifting elements from opposite sides, accidental displacement of the tread in the lateral direction can be prevented.

[0024] In one preferred embodiment, the lifting element and another lifting element are collinear.

[0025] In another embodiment, the lifting element and the additional lifting element are laterally movable relative to each other to insert both the lifting element and the additional lifting element between the outer peripheral surface of the tire carcass and the rear end of the tread. Preferably, both the lifting element and the additional lifting element are movable relative to the base. In other words, both the lifting element and the additional lifting element are movable between a corresponding waiting position and a corresponding lifting position.

[0026] In another embodiment, the engagement device further includes a second driver for driving the movement of the first engagement member in the pressing direction. Optionally, the second driver is a linear driver.

[0027] In another embodiment, the first engagement member includes a first pressure roller rotatable about a first roller axis. Preferably, the first roller axis extends in the lateral direction. Therefore, in addition to pressing the tread onto the tire carcass, the pressure roller can also be rolled on the tread in the circumferential direction. Accordingly, the pressure roller can be used to press the remaining rear portion onto the tire carcass. Thus, the rear portion can be applied to the tire carcass more reliably and / or more consistently.

[0028] In another embodiment, the first engaging member further includes an abutment member having an abutment surface on the outer surface of the tread for resting at the front end of the tread. This abutment surface increases the contact surface between the first engaging member and the tread. Therefore, indentation in the tread material can be prevented.

[0029] In another embodiment, the engagement device further includes a second engagement member movable relative to the base toward the first engagement member in the engagement direction. After the rear edge has been pressed against the front edge, it may still be necessary to firmly press the remaining portion of the tread onto the tire carcass. While the first engagement member holds and / or secures the rear and / or front ends at or near the respective rear and front edges, for example at the joint or contact surface between the front and rear edges, the second engagement member can apply and / or smooth out the remaining portion of the rear end. Therefore, accidental displacement of the tread at the front and / or rear edges can be prevented during the application and / or smoothing of the remaining portion of the rear end.

[0030] In one embodiment, the second engagement member includes a second pressure roller rotatable about a second roller axis. Preferably, the second roller axis extends in a lateral direction. The second pressure roller can roll on the tire tread in a circumferential direction while applying pressure to the tread in a radial direction. Thus, the remaining portion at the rear end can be firmly applied to the tire carcass.

[0031] In another embodiment, the engagement device includes a third actuator for linearly moving the second engagement member in an extension direction perpendicular to the lateral direction. Additionally or alternatively, the second engagement member is pivotable about a pivot axis extending parallel to the lateral direction. Preferably, the engagement device includes a fourth actuator for driving rotation of the second engagement member about the pivot axis. The third actuator can move the second engagement member toward the tread to apply pressure to the tread. The fourth actuator can pivot the second engagement member about the pivot axis, thereby moving it toward and / or away from the tread. The combined movement of the third and fourth actuators can cause the second engagement member to apply pressure to the tread in the radial direction while moving it circumferentially over the tread.

[0032] In another embodiment, the coupling device further includes a control unit configured to cause the coupling device to perform steps b) and c) of the method according to the first aspect of the invention. Preferably, the control unit is also configured to cause the coupling device to perform steps d) and e) of the method according to the first aspect of the invention. Preferably, the control unit is connected to a first driver, a second driver, a third driver, and / or a fourth driver. Therefore, the control unit can control the drivers to cause the coupling device to perform the above-described steps of the method according to the invention. Accordingly, the steps can be performed autonomously and / or automatically. Therefore, the coupling device can perform the method steps more efficiently.

[0033] According to a third aspect, the present invention provides a retreading assembly for applying a tread to a tire carcass, particularly to the outer peripheral surface of the tire carcass, wherein the retreading assembly includes a carcass retaining device for holding the tire carcass, wherein the carcass retaining device is rotatable about a central axis in a circumferential direction to wrap the tread around the outer peripheral surface of the tire carcass, wherein the retreading assembly further includes an engagement device according to a second aspect of the present invention, wherein in the engagement position, the lateral direction extends parallel to the central axis.

[0034] The retreading assembly includes a coupling device according to a second aspect of the invention. Therefore, the retreading assembly inherits the aforementioned advantages of the coupling device. The tire carcass retaining device can rotatably retain and / or support the tire carcass. Accordingly, the coupling device can engage the front and rear ends of the tread on the tire carcass held on the tire carcass retaining device.

[0035] In one embodiment, the engagement device is movable relative to the tire carcass retaining device in a radial direction perpendicular to the central axis. Therefore, the engagement position can be adapted to the outer diameter of the tire carcass. Alternatively, the tire carcass retaining device can move toward and / or away from the engagement device.

[0036] In another embodiment, the retreading assembly further includes a conveyor for supporting the tread in a support plane and for supplying the tread to a carcass retainer in a conveying direction that extends parallel to the support plane and perpendicular to the lateral direction. The conveyor can supply the tread to the carcass held on the carcass retainer.

[0037] In one embodiment, the conveyor includes a rear end gripper for holding the rear end of the tire tread, wherein the rear end gripper is movable along a support plane in the conveying direction. By controlling the rear end gripper, the displacement of the rear end in the conveying direction can be precisely controlled.

[0038] In another embodiment, the retreading assembly further includes a control unit functionally coupled to the tire carcass retainer to control the rotation of the tire carcass retainer about a central axis, and wherein the control unit is also functionally coupled to the conveyor to control the movement of the tread in the conveying direction. In other words, the control unit can control the circumferential speed of the outer surface of the tire carcass on the tire carcass retainer. Accordingly, the control unit can control the speed of the tread, particularly its rear end, in the conveying direction. Therefore, the control unit can adjust the rotational speed of the tire carcass and / or the speed of the tread in response to the length of the tread and / or the circumference of the outer surface of the tire carcass. Accordingly, the tread can be wound around the tire carcass more accurately and / or more reliably.

[0039] In one preferred embodiment, the control unit is arranged to adjust the rotational speed of the tire carcass retaining device about the central axis and the conveying speed of the conveyor, such that the rear end overlaps the front end when the tire tread is wound around the tire carcass.

[0040] In another embodiment, the retreading assembly is provided with a length detection device for detecting the length of the tread on the conveyor. Therefore, the control unit can automatically adjust the rotational speed of the tire retaining device and / or the speed of the conveyor in response to the detected tread length.

[0041] In another embodiment, the retreading assembly further includes a detection device for detecting and / or inspecting the joints and / or overlaps of the front and rear ends of the tread on the tire carcass. Preferably, the detection device is configured to detect the height profile in the radial direction, for example, by triangulation or laser triangulation. The detection device can detect the angular position of the overlap or joint. Therefore, the overlap can be precisely and / or accurately located at the joint position. Additionally, the detection device can be used to inspect the quality of the joint. Thus, the quality of the joint can be inspected at the same retreading assembly before the tire is vulcanized.

[0042] In another embodiment, the retreading assembly also includes a stapling device for applying one or more stapling pins to the front and rear ends of the tread to secure the front and rear ends relative to each other in the circumferential direction. The one or more stapling pins can secure the rear and front ends of the tread firmly before vulcanization. Therefore, the tread can be applied to the tire carcass more reliably.

[0043] The various aspects and features described and illustrated in this specification may be applied individually in any possible circumstances. These individual aspects, particularly those described in the appended dependent claims, may be the subject of a divisional patent application. Attached Figure Description

[0044] The invention will be explained based on exemplary embodiments illustrated in the accompanying drawings, in which: Figures 1-3 A front view of a retreading assembly according to an embodiment of the present invention is shown during an exemplary step of a method of applying a tread to a tire carcass. Figures 4-8 It shows that according to Figure 3 A detailed view of the retreading assembly of circle IV in the tire during a further exemplary step of the method of applying the tread to the tire carcass; Figure 9 It shows that according to Figure 4 A cross-sectional view of line XI-XI in the middle; Figure 10 It shows that according to Figure 5 A sectional view of line XX in the diagram; Figure 11 It shows that according to Figure 6 A cross-sectional view of line XI-XI in the middle; Figure 12 It shows that according to Figure 7 A sectional view of line XII-XII in the middle; and Figure 13 and Figure 14 It shows Figures 1-3 The main view during another exemplary method step. Detailed Implementation

[0045] Figures 1-14 A retreading assembly 1 for applying tread 91 to a tire carcass 9 according to an embodiment of the present invention is shown. The retreading assembly 1 includes a drum-shaped carcass retaining device 2 for holding and / or supporting the tire carcass 9. The retreading assembly 1 also includes a conveyor 3 for supplying the tread 91 to the tire carcass 9 at the carcass retaining device 2.

[0046] like Figures 1-3 and Figures 13-14As best shown, the tire carcass 9 includes an outer peripheral surface 90. More specifically, the tire carcass 9 has an annular or substantially annular shape. The outer peripheral surface 90 of the tire carcass 9 extends in the circumferential direction C about a central axis R.

[0047] In retreading, the tire carcass 9 typically includes a stripped carcass 99, i.e., an old tire whose tread has been removed and / or stripped. Preferably, the tire carcass 9 also includes a buffer layer or buffer rubber 92 applied around the stripped carcass 99. The buffer rubber 92 includes an uncured rubber layer for receiving and / or embedding into the tread 91. After the tread 91 is applied around the tire carcass 9, the assembly of the carcass 9 and the tread 91 is vulcanized to form the retreaded tire.

[0048] like Figures 1-3 As best shown, the tread 91 has an elongated body. The tread extends in the longitudinal direction between a front edge 95 at the front end LE and a rear edge 96 at the rear end TE. The tread has a tread length L between the front edge 95 and the rear edge 96. Preferably, the tread length L corresponds to or substantially corresponds to the circumference of the outer surface 90 of the tire carcass 9. Typically, the tread 91 is cut such that the front edge 95 and the rear edge 96 extend at a right angle, i.e., a ninety-degree angle, relative to the longitudinal direction.

[0049] The tread 91 has an outer surface 93 and an inner surface 94 opposite to the outer surface 93. The inner surface 94 and the outer surface 93 each extend between a front edge 95 and a rear edge 96. Preferably, a tire profile (not shown) has been formed on the outer surface 93 of the tread 91. Preferably, the tread 91 is pre-cured and / or pre-vulcanized before being applied to the tire carcass 9.

[0050] like Figure 4 As best shown, the retreading assembly 1 is arranged to initially apply the tread 91 around the outer peripheral surface 90 of the tire carcass 9 with the rear end TE placed on top of the front end LE. Accordingly, a gap G is formed between the rear end TE and the outer peripheral surface 90 of the tire carcass 9. The gap G is defined by the front edge 96 in the circumferential direction C. Figure 3 The overlap has been omitted to better illustrate the renovation component 1.

[0051] The tire carcass retaining device 2 is arranged to rotate the tire carcass 9 about the central axis R, so as to wrap around the tread 91 around the tire carcass 9. Figures 1-3 , Figure 13 and Figure 14 In the illustrated embodiment, the tire carcass retaining device 2 includes a drum rotatable about a central axis R. Alternatively, the tire carcass retaining device 2 may include, for example, a plurality of rollers for rotatably supporting the tire carcass 9.

[0052] like Figures 1-3 , Figure 13and Figure 14 As is best seen, the conveyor 3 includes a support surface 30 for supporting the tread 91 in the support plane P. The conveyor 3 is arranged to convey the tread 91 toward the tire carcass retaining device 2 in a conveying direction T. The conveying direction T extends parallel to the support plane P.

[0053] The conveyor 3 and the tire carcass retainer 2 are movable toward and away from each other to apply the front end LE of the tread 91 to the outer peripheral surface 90 of the tire carcass 9. The conveyor 3 may, for example, be able to pivot about a pivot axis (not shown) extending parallel to the central axis R, so that the upstream end 32 of the conveyor 3 moves toward and / or away from the tire carcass retainer 2. Additionally or alternatively, the tire carcass retainer 2 may be movable toward the support plane P in a radial direction B perpendicular to the central axis R.

[0054] In the illustrated embodiment, the conveyor 3 further includes a rear gripper 31 for gripping and / or holding the rear end TE of the tread 91. The rear gripper 31 is movable along the support surface 30 of the conveyor 3 in the conveying direction T, so that the rear end TE of the tread 91 moves in the conveying direction T.

[0055] The refurbishing assembly 1 also includes a control unit 7 functionally coupled to the tire carcass retainer 2 and the conveyor 3. The control unit 7 is arranged to control the rotation of the tire carcass 9 about its central axis R and the movement of the rear end gripper 32 in the conveying direction T. More specifically, as Figure 4 As best shown, the control unit 7 is configured to adjust the rotational speed of the tire carcass 9 and / or the speed of the rear end gripper 32 so that the rear end TE initially wraps around the tire carcass 9 and the tread 91 in such a way that the rear end TE overlaps the front end LE of the tread 91 in the circumferential direction C. As a result, a gap G is formed between the tire carcass 9 and the rear end TE of the tread 91.

[0056] like Figures 1-14 As further shown, the retreading assembly 1 also includes a joining device 8 for engaging the front end LE and rear end TE of the tread 91 on the tire carcass 9. More specifically, the joining device 8 is arranged to engage the front edge 95 and the rear edge 96 of the tread 91 to form a mating joint. The joining device 8 can be positioned at or near the engagement location on or near the tire carcass 9.

[0057] exist Figures 1-3 , Figure 13 and Figure 14In the illustrated embodiment, the engagement device 8 is arranged above the tire carcass retaining device 2. Correspondingly, the engagement device 8 is arranged above the tire carcass 9 arranged around the tire carcass retaining device 2. Preferably, the engagement device 8 is movable toward and away from the tire carcass retaining device 2. Optionally, the engagement device 8 may also be rotatable about a central axis R relative to the tire carcass retaining device 2. Preferably, the engagement device 8 is functionally connected to a control unit 7. Accordingly, the control unit 7 is configured to control the engagement device 8.

[0058] like Figures 4-12 As best shown, the engagement device 8 includes a base 80. In the illustrated embodiment, the base 80 includes a plate-like body. The base 80 extends in the lateral direction A. The base 80 can be positioned in an engagement position at or near the outer peripheral surface 90 of the tire carcass 9 at the tire carcass retainer 2. In the engagement position, the lateral direction A extends parallel or substantially parallel to the central axis R.

[0059] In the illustrated embodiment, the engagement device 8 includes a base actuator 75 for moving the base 80 relative to the tire carcass retainer 2. In other words, the base actuator 75 is arranged to move the base 80 toward or away from the tire carcass 9. More specifically, the engagement device 8 is movable relative to the tire carcass retainer 2 in the radial direction B of the tire carcass retainer 2. In other words, the radial position of the engagement device 8 can be adapted to the radius of the tire carcass 9.

[0060] like Figures 9-12 As best shown, the engagement device 8 includes two lifting elements 81 for lifting the rear end TE of the tread 91 from the front end LE of the tire carcass 9 and / or the tread 91. Alternatively, the engagement device 8 may include a single lifting element 81. The lifting element 81 is arranged to lift the rear end TE from the front end LE of the tread 91. More specifically, the lifting element 81 is arranged to lift an end portion or terminal portion of the rear end TE from the front end LE. The terminal portion extends between the lifting element 81 and the rear edge 96.

[0061] exist Figures 4-12 In the engagement position shown, the lifting element 81 is positioned in the radial direction B between the tire carcass retaining device 2 and the base 80 of the engagement device 8. More specifically, the lifting element 81 is positioned in the radial direction B between the tire carcass 9 and the base 80.

[0062] like Figures 9-12 As best shown, the lifting element 81 extends or protrudes in the lateral direction A. The lifting element 81 tapers in the lateral direction A. More specifically, each of the lifting elements 81 tapers towards its respective end in the lateral direction A. Each of the lifting elements 81 includes a tapered surface 810 arranged to face away from the tire carcass retaining device 2 and / or the tire carcass 9 in the radial direction B.

[0063] Preferably, the thickness of the lifting element 81 in the radial direction B is less than the thickness of the tread 91 at least at the end of the lifting element 81. The end of the lifting element 81 may, for example, have a thickness between two and five millimeters.

[0064] like Figures 9-12 Furthermore, it is shown that the lifting element 81 can move between the waiting position and the lifting position.

[0065] like Figure 10 and Figure 11 Ideally, in the raised position, the lifting element 81 is arranged to be inserted between the rear end TE of the tire carcass 9 and the tread 91. Preferably, the lifting element 81 is arranged to be inserted into the gap G formed between the tire carcass 9 and the rear end TE by the overlap of the rear end TE and the front end LE of the tread 91.

[0066] In the waiting position, the lifting element 81 is positioned outside the gap G between the tire carcass 9 and the tread 91. In the illustrated embodiment, in the waiting position, the lifting element 81 is spaced apart from the tread 91 in the lateral direction A.

[0067] Preferably, the lifting element 81 is linearly movable in the lateral direction A between a waiting position and a lifting position. Additionally or alternatively, the lifting element 81 may, for example, be pivotable between the waiting position and the lifting position.

[0068] like Figures 9-12 As best illustrated, the engagement device 8 includes two first actuators or first drivers 71, each first actuator or first driver 71 arranged to move a corresponding lifting element 81 in the lateral direction A. Alternatively, the engagement device 8 may include a single first driver 71 for synchronously and / or symmetrically moving the two lifting elements 81 toward or away from each other in the lateral direction A.

[0069] like Figures 4-12 As further shown, the engagement device 8 includes a first engagement member 82 for pressing the rear end TE of the tread 91 onto the outer peripheral surface 90 of the tire carcass 9. More specifically, the first engagement member 82 is arranged for pressing the end portion of the rear end TE onto the tire carcass 9.

[0070] The first engaging member 82 is movable relative to the base 80 in a pressing direction D. The pressing direction D extends in a direction perpendicular to the lateral direction A. The pressing direction D includes at least a vector component in the radial direction B. Optionally, the pressing direction D extends in or substantially in the radial direction B. Alternatively, the pressing direction D also includes a vector component in the circumferential direction C. The first engaging member 82 is spaced apart from the lifting element 81 in an engaging direction H perpendicular to both the lateral direction A and the pressing direction D.

[0071] The engagement device 8 includes a second actuator or second driver 72 for driving the first engagement member 82 to move in the pressing direction D. In the illustrated embodiment, the second driver 72 is a linear actuator, such as a pneumatic cylinder.

[0072] In the illustrated embodiment, the first engaging member 82 includes a first engaging roller rotatable about a first roller axis X2. The second roller axis X3 extends parallel or substantially parallel to the lateral direction A. When the first engaging member 82 is pressed against the tread 91 in the pressing direction D, the first engaging roller allows relative movement between the tread 91 and the first engaging member 82 in the circumferential direction C.

[0073] Additionally, the first engagement member 82 includes an abutment element 84. The abutment element 84 is arranged to rest on the front end LE of the tread 91.

[0074] like Figures 4-12 Further shown, the engagement device 8 also includes a second engagement member 83. The second engagement member 83 is arranged to press the rear end TE of the tread onto the tire carcass 9 after the lifting element 81 has been withdrawn from the gap G between the tire carcass 9 and the rear end TE. The second engagement member 83 is spaced apart from the lifting element 81 in the engagement direction H. The first engagement member 82 and the second engagement member 83 are arranged on opposite sides of the lifting element 81 in the engagement direction H.

[0075] The second engaging member 83 includes a second engaging roller rotatable about a second roller axis X3. The second roller axis X3 extends parallel or substantially parallel to the lateral direction A.

[0076] like Figure 7 and Figure 8 As best shown, the second engaging member 83 is movable relative to the first engaging member 82 in the circumferential direction C. In other words, the second engaging member 83 is movable toward and away from the first engaging member 82 in the engaging direction H.

[0077] Additionally, the second engaging member 83 is movable in the radial direction B relative to the base 80. Correspondingly, the second engaging member 83 is movable in the radial direction B relative to the lifting element 81. Preferably, the second engaging member 83 is movable in the radial direction B independently of the first engaging member 82.

[0078] In the illustrated embodiment, the second engaging member 83 is pivotable relative to the base 80 and / or the first engaging member 82 about a pivot axis E. The pivot axis E extends parallel or substantially parallel to the lateral direction A. Additionally, the second engaging member 83 is movable and / or extended in an extension direction F perpendicular to the pivot axis E. Therefore, in the illustrated embodiment, the movement of the second engaging member 83 in the circumferential direction C is the result of a combination of rotation about the pivot axis E and movement in the extension direction F.

[0079] The engagement device 8 includes a third actuator or third driver 73 for driving movement of the second engagement member 83 in the extension direction F. Preferably, the third driver 73 is a linear driver, such as a pneumatic cylinder. Additionally, the engagement device 8 includes a fourth actuator or fourth driver 74 for driving rotation of the second engagement member 84 about the pivot axis E. In the illustrated embodiment, the fourth driver 74 is a linear driver acting on the second engagement member at a distance from the pivot axis E. Alternatively, the fourth driver 74 may, for example, include a rotary driver.

[0080] like Figures 1-3 , Figure 13 and Figure 14 Further shown, the retreading assembly 1 also includes an inspection unit 12. The inspection unit 12 is functionally connected to the control unit 7. The inspection unit 12 is arranged to detect and / or inspect the overlap between the front end LE and the rear end TE of the joint S and / or the tread 91. More specifically, the inspection unit 12 is configured to detect the height profile of the tire carcass 9 and / or the tread 91 wrapped around the tire carcass 9 in the radial direction B. The inspection unit 12 may, for example, include a triangulation camera for determining the height profile, such as by using laser triangulation.

[0081] The inspection unit 12 can be configured to detect the position of the joint S and / or the overlap in the circumferential direction C. Preferably, the control unit 7 is configured to detect the angular position of the overlap and subsequently control the tire carcass retaining device 2 to rotate the tire carcass 9 to position the overlap at the engagement device 8. The inspection unit 12 can also be used to inspect the quality of the joint S.

[0082] Optionally, the refurbishment assembly 1 also includes a fastening machine, fastening device, or fastening device 13. The fastening device 13 is arranged to apply one or more fastening staples to hold the rear end TE and the front end LE together. In the illustrated embodiment, the fastening device 13 is functionally connected to the control unit 7. Preferably, the control unit 7 is configured to automatically detect the joint S using the inspection unit 12 and subsequently control the tire carcass retaining device 2 to rotate the tire carcass 9 to position the joint S at the location of the fastening device 13.

[0083] The following will refer to Figures 1-14A method for applying tread 91, particularly pre-cured or pre-vulcanized tread, to tire carcass 9 is described.

[0084] like Figure 1 As shown, the tire carcass 9 is mounted on the carcass retainer 2. More specifically, the carcass is positioned around the drum of the retainer 2. Preferably, the carcass 9 comprises a stripped carcass 99 formed by peeling the tread from an old tire. In the illustrated embodiment, the tire carcass 9 also includes a cushioning layer or cushioning rubber 92 applied around the stripped carcass 99.

[0085] A tread 91 is mounted on the conveyor 3. The tread 91 has a length L. The length L corresponds to or substantially corresponds to the outer perimeter S of the tire carcass 9. The tread 91 has an outer surface 93 facing the conveyor 3 and an inner surface 94 opposite to the outer surface 93 and away from the conveyor 3. Preferably, the outer surface 93 has a tread profile.

[0086] The downstream ends 32 of the tire carcass retainer 2 and the conveyor 3 have moved toward each other so that the front end LE of the tread contacts the buffer layer 92 surrounding the tire carcass 9. Preferably, the front end LE is pressed into and / or pressed into the buffer layer 92. Specifically, the inner surface 94 of the tread 91 is in contact with the buffer layer 92. The rear end TE of the tread 91 is held by the rear end gripper 31.

[0087] like Figure 2 As shown, the tire carcass 9 has been rotated about its central axis R by the holding device 2 to wrap the tread 91 around the outer peripheral surface 90 of the tire carcass 9. The rear gripper 31 has moved along the support surface 30 of the conveyor 3 in the conveying direction T. Preferably, the rear gripper 31 moves at an applied speed corresponding to or substantially corresponding to the circumferential speed of the tire carcass 9 at the outer peripheral surface 90. Optionally, during the application of the tread 91 to the tire carcass 9, the rear gripper 31 may selectively move at a lower speed to stretch at least a portion of the tread 91.

[0088] like Figure 3 As shown, the entire tread 91 has been wrapped around the tire carcass 9. The tire carcass 9 has been further rotated in the circumferential direction C by the tire carcass retaining device 2, so that the front end LE and rear end TE of the tread 91 move toward and / or into the engagement position, in which the rear end TE is located at or near the engagement device 8. Additionally or alternatively, the engagement device 8 may be rotated about the central axis R relative to the tire carcass retaining device 2, so that the engagement device 8 moves toward and / or into the engagement position.

[0089] like Figure 4As shown, the rear end TE of the tread 91 overlaps with the front end LE of the tread 91. Preferably, the rear end TE overlaps with the front end LE by an overlap of two to six millimeters. More preferably, the overlap is between three and five millimeters, for example, four millimeters.

[0090] This overlap can be formed, for example, by cutting the tread 91 to a length L slightly longer than the circumference of the tire carcass 9 at its outer peripheral surface 90. The length L of the tread 91 can, for example, be two to six millimeters or three to five millimeters longer than the circumference. Additionally or alternatively, this overlap can be formed by stretching the tread 91 during the application of the tread 91 to the tire carcass 9.

[0091] Preferably, before moving the front end LE and rear end TE toward the engagement position, the tire is rotated in the circumferential direction C until the overlap between the rear end TE and the front end LE is detected by the detection device 12. Upon detection of the overlap, the control unit 7 can automatically control the tire retaining device 2 to rotate the overlap toward the engagement position. Accordingly, the overlap can be positioned more precisely and / or accurately in the engagement position.

[0092] like Figure 9 As best shown, the lifting element 81 is positioned in the waiting position. The lifting element 81 is spaced apart from the tread 91 in the lateral direction A. The lifting element 81 extends beyond the outer peripheral surface 90 of the tire carcass 9 in the radial direction B. Preferably, the lifting element 81 is positioned in the radial direction B such that the tapered surface 810 of the lifting element 81 and the inner surface 94 of the tread 91 extend with the same radius in the radial direction B.

[0093] like Figure 5 and Figure 10 As shown, the lifting elements 81 have moved toward each other in the lateral direction A. More specifically, the lifting elements 81 have moved from the waiting position toward the lifting position. The lifting elements 81 have been inserted between the tire carcass 9 and the tread 91. As a result, the rear end TE of the tread 91 has been forced away from the tire carcass 9 in the radial direction B by the respective tapered surfaces 810 of the lifting elements 81. Accordingly, the rear end TE has been lifted from the front end LE in the radial direction B. In other words, the rear end TE is now supported on the respective tapered surfaces 810 of the lifting elements 81.

[0094] like Figure 6 and Figure 11 As shown, the rear end TE of the tread 91 remains supported on the lifting element 81. The first engaging member 82 has moved in the pressing direction D. Accordingly, the end portion or distal portion of the rear end TE extending between the lifting element 81 and the rear edge 96 has been forced toward the tire carcass 9 by the first engaging member 82. In other words, the distal portion of the rear end has bent toward the tire carcass 9 from and / or across the lifting element 81.

[0095] The rear end portion is pressed into and / or embedded into the cushioning rubber 92 of the tire carcass 9 in the pressing direction D by the first engaging member 81. Preferably, the pressing of the first engaging member 82 in the pressing direction D causes the rear edge 96 to press against the front edge 95 of the tread 91.

[0096] like Figure 7 and Figure 12 As shown, the first engaging member 82 rests on the front end LE and the rear end TE of the tread 91 to secure the front end LE and the rear end TE in place. More specifically, the abutment member 84 of the first engaging member 82 rests on and / or supports the front end LE of the tread 91 to prevent the first engaging roller from pressing (sinking) into the material of the tread 91. The lifting elements 81 have moved away from each other in the first direction A. More specifically, the lifting elements 81 have moved from the lifting position back toward the waiting position and / or moved into the waiting position. The lifting elements 81 have been withdrawn from the space between the tire carcass 9 and the tread 91 in the lateral direction A.

[0097] As a result, Figure 7 As best shown, the remaining portion of the rear end TE, adjacent to the end portion of the rear end TE in the circumferential direction C, has been released. Due to the initial overlap between the front end LE of the tread 91 and the rear end TE, this remaining portion has a longer length than the corresponding portion of the tire carcass's circumference at the outer circumferential surface 90. Accordingly, the remaining portion of the rear end TE may not be securely applied to and / or embedded in the cushioning rubber 92.

[0098] like Figure 7 and Figure 12 Further shown, the second engaging member 83 extends in the extending direction F to press the rear end TE of the tread 91 onto and / or into the cushioning compound 92 of the tire carcass 9. More specifically, the second engaging member 83 is pressed onto the remainder of the rear end TE at a position spaced apart from the rear edge 96 in the circumferential direction C. The second engaging member 83 can be pressed onto the tread 91 before, during, or after the lifting element 81 is withdrawn.

[0099] like Figure 8 As shown, the second engaging member 83 has moved in the circumferential direction C to press the remaining portion of the rear end TE into and / or into the cushioning rubber 92 of the tire carcass 9. More specifically, the second engaging member 83 has been rotated about the pivot axis E by the fourth actuator 74 to move the second engaging member 83 toward the first engaging member 82 in the engagement direction H. The third actuator 73 has been controlled to reciprocate the second engaging member 83 in the extension direction F to move the second engaging member 83 in the circumferential direction C, for example, in the radial direction B with a constant radius.

[0100] Optionally, such as Figure 13 As shown, the method may further include the step of rotating the tire carcass 2 in the circumferential direction C to position the joint at or near the detection device 12. Subsequently, a quality check of the joint S can be performed using the detection device 12.

[0101] like Figure 14 As shown, the method may further include rotating the tire carcass 9 in the circumferential direction C to position the joint S at or near the stapling device 13. Subsequently, one or more stapling pins (not shown) may be inserted into the front end LE and the rear end TE to secure the front end LE and the rear end TE before vulcanizing the tire.

[0102] It should be understood that the above description is intended to illustrate the operation of preferred embodiments and is not intended to limit the scope of the invention. Many variations will be apparent to those skilled in the art from the above discussion, but these variations are also included within the scope of the invention.

[0103] List of reference numerals

[0104] 1 Refurbished components

[0105] 12 Inspection Units

[0106] 13. Stapling device

[0107] 2. Tire body retaining device

[0108] 3 Conveyor

[0109] 30 Support surface

[0110] 31. Backend gripper

[0111] 31 Downstream end

[0112] 7 Control Unit

[0113] 71 First Driver

[0114] 72 Second Drive

[0115] 73 Third Drive

[0116] 74 Fourth Drive

[0117] 75 Base Driver

[0118] 8. Connecting device

[0119] 80 base

[0120] 81 Lifting Components

[0121] 810 tapered surface

[0122] 82 First joint member

[0123] 83 Second joint component

[0124] 84 Adjacent elements

[0125] 9. Tire Carcass

[0126] 90 peripheral surface

[0127] 91 Tread

[0128] 92 Cushioning Gel

[0129] 93 Outer surface

[0130] 94 Inner Surface

[0131] 95-degree leading edge

[0132] 96 Post-edge

[0133] 99. Stripping the fetal body

[0134] A Lateral direction

[0135] B Radial direction

[0136] C. Circumferential direction

[0137] D Pressing direction

[0138] E Pivot axis

[0139] F Extension direction

[0140] G gap

[0141] H. Joint direction

[0142] L length

[0143] LE front end

[0144] P Support surface

[0145] T direction of transport

[0146] TE backend

[0147] R central axis

[0148] X2 First roller axis

[0149] X3 Second Roller Axis

Claims

1. A method of applying tread around the outer circumferential surface of the tire carcass using a bonding device. The outer peripheral surface extends circumferentially around a central axis, and the tread includes an elongated body having a front end terminating at a front edge and a rear end terminating at a rear edge opposite to the front end. The engagement device includes a lifting element that can be inserted between the outer peripheral surface of the tire carcass and the rear end of the tread, and a first engagement member that can move relative to the lifting element in a pressing direction. The method includes the following steps: a) Apply the front end of the tread to the outer peripheral surface of the tire carcass, and then wrap the tread around the tire carcass such that the rear end of the tread overlaps the front end, thereby forming a gap between the rear end and the outer peripheral surface; b) Inserting the lifting element into the gap to support the rear end of the tread relative to the outer peripheral surface; and c) When the lifting element in step b) supports the rear end, the first engaging member is used to press the end portion of the rear end located between the lifting element and the rear edge onto the outer peripheral surface of the tire carcass.

2. The method according to claim 1, characterized in that, The lifting element is inserted into the gap in a lateral direction perpendicular to the pressing direction.

3. The method according to claim 1, characterized in that, Following step c), the method further includes the following steps: d) Remove the lifting element from the gap.

4. The method according to claim 3, characterized in that, Following step d), the method further includes the following steps: e) Press the remaining portion of the rear end onto the outer peripheral surface of the tire carcass.

5. The method according to claim 4, characterized in that, Step e) includes: pressing the first engaging member onto the tread at a distance spaced from the rear edge in the circumferential direction, and moving the first engaging member toward the rear edge in the circumferential direction while pressing the remaining portion of the rear end onto the outer circumferential surface of the tire carcass.

6. The method according to claim 4, characterized in that, The engagement device further includes a second engagement member, and step e) includes: pressing the second engagement member onto the tire tread at a distance spaced from the rear edge in the circumferential direction, and moving the second engagement member toward the rear edge in the circumferential direction while pressing the remaining portion of the rear end onto the outer circumferential surface of the tire carcass.

7. The method according to claim 1, characterized in that, Step c) further includes pressing the rear edge against the front edge of the tread.

8. The method according to claim 1, characterized in that, The engagement device includes a further lifting element that protrudes toward the lifting element in a lateral direction perpendicular to the pressing direction, wherein step b) includes: inserting the lifting element and the further lifting element from opposite sides into the gap to support the rear end of the tread relative to the outer peripheral surface.

9. The method according to claim 1, characterized in that, In step a), the rear end overlaps the front end by two to six millimeters.

10. The method according to claim 1, characterized in that, The joining device further includes a control unit, wherein the control unit is configured to control the joining device to perform the steps of the method.

11. A coupling device for applying tread to the outer peripheral surface of a tire carcass, wherein, The joining device is adapted for use in the method according to claim 1, wherein the joining device comprises: - A lifting element for supporting the rear end in a position spaced apart from the tire carcass, wherein in the lifted position, the lifting element is insertable into the gap between the outer peripheral surface of the tire carcass and the rear end of the tread, and protrudes in a lateral direction; - A first engaging member, movable relative to the lifting element in a pressing direction perpendicular to the lateral direction, to press the end portion of the rear end onto the tire carcass, wherein the first engaging member and the lifting element are spaced apart in an engaging direction perpendicular to both the lateral and pressing directions.

12. The coupling device according to claim 11, characterized in that, The lifting element is movable relative to the first engaging member from the waiting position toward or into the lifting position to insert the lifting element into the gap between the outer peripheral surface of the tire carcass and the rear end of the tread.

13. The coupling device according to claim 12, characterized in that, The lifting element can move linearly in the lateral direction from the waiting position toward the lifting position or linearly into the lifting position.

14. The coupling device according to claim 12, characterized in that, The engagement device includes a first drive for moving the lifting element in the lateral direction.

15. The coupling device according to claim 12, characterized in that, The lifting element tapers in the lateral direction.

16. The coupling device according to claim 11, characterized in that, The engagement device includes an additional lifting element projecting toward the lifting element in the lateral direction, wherein the additional lifting element is insertable into the gap between the outer peripheral surface of the tire carcass and the rear end of the tread to lift the rear end from the tire carcass.

17. The coupling device according to claim 16, characterized in that, The lifting element and the other lifting element are collinear.

18. The coupling device according to claim 16, characterized in that, The lifting element and the additional lifting element are movable relative to each other in the lateral direction for inserting both the lifting element and the additional lifting element between the outer peripheral surface of the tire carcass and the rear end of the tread.

19. The coupling device according to claim 11, characterized in that, The engagement device further includes a second driver for driving the movement of the first engagement member in the pressing direction.

20. The coupling device according to claim 11, characterized in that, The first engaging member includes a first pressure roller that can rotate about the axis of the first roller.

21. The coupling device according to claim 20, characterized in that, The first roller axis extends in the lateral direction.

22. The coupling device according to claim 20, characterized in that, The first engaging member further includes an abutting member having an abutting surface on the outer surface of the tread for resting on the front end of the tread.

23. The coupling device according to claim 11, characterized in that, The joining device further includes a second joining member, which is movable relative to the base toward the first joining member in the joining direction.

24. The coupling device according to claim 23, characterized in that, The second engagement member includes a second pressure roller that can rotate about the axis of the second roller.

25. The coupling device according to claim 24, characterized in that, The second roller axis extends in the lateral direction.

26. The coupling device according to claim 23, characterized in that, The engagement device includes a third actuator for linearly moving the second engagement member in an extension direction perpendicular to the lateral direction.

27. The coupling device according to claim 23, characterized in that, The second joining member is pivotable about a pivot axis extending parallel to the lateral direction.

28. The coupling device according to claim 27, characterized in that, The engagement device includes a fourth actuator for driving the rotation of the second engagement member about the pivot axis.

29. The coupling device according to claim 11, characterized in that, The engagement device further includes a control unit configured to cause the engagement device to perform steps b) and c) of the method according to claim 1.

30. A retreading assembly for applying a tread to the outer peripheral surface of a tire carcass, wherein the retreading assembly includes a carcass retaining device for supporting the tire carcass and for rotating the tire carcass about a central axis in a circumferential direction to wrap the tread around the outer peripheral surface of the tire carcass, wherein the retreading assembly further includes a coupling device according to claim 11, wherein in the coupling position, the lateral direction extends parallel to the central axis.

31. The refurbishment component according to claim 30, characterized in that, The engagement device is movable relative to the tire retaining device in a radial direction perpendicular to the central axis.

32. The refurbishment component according to claim 30, characterized in that, The retreading assembly also includes a conveyor for supporting the tread in a support plane and for supplying the tread to the tire carcass retaining device in a conveying direction that extends parallel to the support plane and perpendicular to the lateral direction.

33. The refurbishment component according to claim 32, characterized in that, The conveyor includes a rear end gripper for holding the rear end of the tire tread, wherein the rear end gripper is movable along the support plane in the conveying direction.

34. The refurbishment component according to claim 32, characterized in that, The retreading assembly also includes a control unit, wherein the control unit is functionally coupled to the tire retainer to control the rotation of the tire retainer about the central axis, and wherein the control unit is also functionally coupled to the conveyor to control the movement of the tire tread in the conveying direction.

35. The refurbishment component according to claim 34, characterized in that, The control unit is configured to adjust the rotational speed of the tire carcass retaining device about the central axis and the conveying speed of the conveyor in the conveying direction, such that when the tread is wound around the tire carcass, the rear end overlaps the front end.

36. The refurbishment component according to claim 35, characterized in that, The refurbishing assembly is equipped with a length detection device for detecting the length of the tire tread on the conveyor.

37. The refurbishment component according to claim 30, characterized in that, The retreading assembly also includes an inspection device for detecting or inspecting the joint or overlap of the front and rear ends of the tread on the tire carcass.

38. The refurbishment component according to claim 30, characterized in that, The retreading assembly also includes a stapling device for applying one or more stapling pins to the front and rear ends of the tread to secure the front and rear ends relative to each other in the circumferential direction.

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