JP2008307749A - Method and apparatus for manufacturing retreaded tire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the uniformity of the thickness or the like of a cushion rubber layer formed on a base tire of a retreaded tire, and to form the cushion rubber layer having high uniformity for plural kinds of base tires. <P>SOLUTION: The base tire DT is held by a holding device 10 to rotate around an axis line, and the ribbon-like rubber is extrusion-molded from an extruder 21, and continuously supplied to the base tire DT to stick to the surface. The extruder 21 is moved by a moving means 30 at a predetermined speed along the surface of the base tire DT, and the sticking position with respect to the surface of the base tire DT of the ribbon-like rubber to be supplied is sequentially displaced along the surface from the one end side toward the other end side of the sticking range. The ribbon-like rubber is spirally wound to the base tire DT while abutting the side part each other to form a cushion rubber layer. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method and an apparatus for producing a retread tire that has been refurbished so that the tread rubber of a worn tire can be used again, and in particular, a tread member is attached to a base tire via a cushion rubber layer. The present invention relates to a manufacturing method and a manufacturing apparatus for a retread tire to be retreaded.

  For automobile tires, such as heavy duty tires for trucks and buses, construction vehicles, etc., even when the tread rubber that contacts the road surface wears out and has a life (mainly primary life), carcass, belt, etc. In many cases, the base portion made of is sufficiently durable for continuous use. Therefore, conventionally, in such a case, from the viewpoint of economic efficiency and environmental conservation, the tread rubber is removed from the used tire to form a base tire, and a new tread rubber is attached to the outer surface side of the tire as a tire. The function is restored and rehabilitated (reproduced) so that it can be used again.

  Such tires are called retreaded tires, and the tread rubber before retreading is removed by removal processing such as buffing or grinding, and the surface of the base tire (revitalized surface) around its outer peripheral surface is unvulcanized. After a tread member (rehabilitated tread) for rehabilitation such as a tread rubber or a vulcanized tread rubber (precured tread) is pasted, it is manufactured through a vulcanization process or the like.

  By the way, in the manufacturing process of this retreaded tire, usually, before attaching a new tread member to the base tire, cushion rubber is arranged on the surface of the base tire to form an intermediate layer (cushion rubber layer), and the cushion rubber layer Then, the tread member is attached to the base tire. This cushion rubber layer is for securing a sufficient adhesive force between the base tire and the tread member, and an unvulcanized cushion rubber member (cushion sheet) formed in advance into a sheet shape is used as the base tire. In general, it is formed by bonding to the surface. Specifically, the cushion sheet is continuously formed into a sheet having a predetermined width according to the width of the tread member, etc., by rolling the unvulcanized rubber in a separate rolling process, and has peelability. It is wound on a reel (roll) with a liner in between and stored in a wound state. Thereafter, the cushion sheet is pulled out from the roll during use in the manufacture of the retread tire, and is used by being wound around the surface of the rotating base tire to form a cushion rubber layer.

  However, when the cushion rubber layer is formed in this way, a plurality of types of cushion sheets must be prepared and stored in advance in accordance with the base tire, the tread member, or the width of the formation range thereof. However, there arises a problem that man-hours or storage space corresponding to that is necessary. At the same time, the work of attaching the cushion sheet to the base tire becomes complicated, and there is a tendency that productivity of retreaded tire manufacturing is lowered, such as requiring labor and time.

  Therefore, conventionally, in order to deal with such a problem, in the stage before the tread member is pasted, while the cushion sheet is extruded, it is pressed against the rotating base tire and pasted, and a cushion rubber layer is formed on the surface of the base tire. An apparatus for manufacturing a retread tire that is directly formed is also known (see Patent Documents 1, 2, and 3).

FIG. 3 is a side view schematically showing a schematic configuration of such a conventional retread tire manufacturing apparatus, which is not described in the patent literature.
As shown in the figure, this retreaded tire manufacturing apparatus 100 supports a base tire DT after removing the tread rubber and supports the base tire DT so as to rotate around an axis, and unvulcanized rubber is extruded to form a sheet-like cushion sheet. And an extruder 110 for forming into a shape. The extruder 110 includes an extrusion head 111 attached to the front end side (left end side in the drawing) in the rubber extrusion direction, and a hot water device 112 for adjusting the temperature of the airframe including the extrusion head 111 installed on the lower side. The hot water of a predetermined temperature from the hot water device 112 is supplied to the extrusion head 111 and each part of the machine body through a pump or a pipe (not shown) and circulated to adjust the temperature and internal rubber to a predetermined temperature. It is supposed to be.

  When the cushion rubber layer is formed by the manufacturing apparatus 100, first, the front end portion of the extrusion head 111 of the extruder 110 is arranged to face a predetermined pasting range of the base tire DT supported by the support means 101. In this state, the cushion sheet is pushed out from an opening (rubber extrusion port) of a base (not shown) provided at the front end of the extrusion head 111, pressed against the base tire DT, and adhered with adhesive force or the like, and the base tire DT Rotate. Subsequently, while continuously supplying the cushion sheet, the base tire DT is rotated once to dispose the cushion sheet over the entire circumferential direction to form a cushion rubber layer. As described above, in the manufacturing apparatus 100, the cushion rubber layer is formed by being directly stuck to the base tire DT while being continuously extruded by the extruder 110, and the above-described intermediate steps such as a rolling step and a storage operation are omitted. While improving the productivity of retreaded tires, the pasting work is simplified.

  However, in this conventional retreaded tire manufacturing apparatus 100, it is necessary to form a cushion sheet having substantially the same width as the cushion rubber layer to be formed by the extruder 110, so the width and shape of the base tire DT and the cushion rubber layer It is difficult to respond flexibly and appropriately to changes, etc., and the performance and quality of retreaded tires may be affected due to the properties of the formed cushion rubber layer. That is, in such a manufacturing apparatus 100, when changing the width | variety of the cushion sheet | seat to shape | mold, for example corresponding to the change of the width | variety etc. of the base tire DT or a cushion rubber layer, the opening width | variety of said nozzle | cap | die opening part is an adjustment means. In general, it is necessary to adjust and change according to the above. At that time, since the curve shape corresponding to the outer surface shape of the base tire DT cannot be changed with respect to the surface (inner surface) shape of the extrusion head 111 and the base tire DT, rubber extrusion (discharge) in the width direction of the extruder 110 is not possible. The uniformity of the pattern and the uniformity in the width direction of the molded cushion sheet may be reduced. Along with this, the thickness (gauge) of the formed cushion rubber layer also becomes non-uniform in the width direction, etc., especially when the thickly formed part is subject to repeated strains due to the use of retreaded tires. As a result, there is a risk of becoming a nucleus (starting point) of heat generation destruction.

  In the manufacturing apparatus 100, when the cushion rubber layer is formed, it is necessary to overlap both ends of the start (start point) and end (end point) of the cushion sheet around the base tire DT by overlapping each other. As a result, the thickness of the cushion rubber layer in the vicinity of this overlap is inevitably thicker than the other parts, the uniformity of the cushion rubber layer in the circumferential direction is reduced, and the heat generation failure is also caused in the vicinity in the same manner as above. There is also a risk of becoming the core of.

  Furthermore, in this manufacturing apparatus 100, it is only necessary that the outer shape of the base tire DT around which the cushion sheet is wound is constant. However, when the tire size and type are different, the curvature of the outer surface in the tire width direction cross section also changes. It is general and cannot cope with this shape change, and the uniformity of the thickness etc. of the formed cushion rubber layer may be lowered. Along with this, the shape of the vicinity of the shoulder portion (shoulder out) of the retread tire after manufacture may be affected, and when the rectangular ratio becomes larger than 1.0, the heat generation durability of the retread tire is increased. There is also a risk of decline.

  In addition, in this manufacturing apparatus 100, the base tire DT is rotated once to form a cushion rubber layer having a predetermined thickness and shape, that is, the cushion sheet must be formed wide to match the width of the cushion rubber layer. In addition, it is necessary to use an extruder 110 for extruding it, which has a relatively large diameter (for example, about 45 mm or 60 mm). As a result, the entire size of the extruder 110 and the manufacturing apparatus 100 is increased, and each installation space for installing them is also widened. Therefore, the installation location of the apparatus is limited and restricted. At the same time, a relatively large device (here, the hot water device 112) is required to adjust the temperature of the extruder 110 and the extrusion head 111, and the wide space (for example, 1 m × 1. 5m) must be secured, and there is a problem that the effective use of spaces in factories and the like is hindered.

Japanese National Patent Publication No. 8-506292 EP1125964A2 publication Japanese Patent Laid-Open No. 9-239864

  The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to enable downsizing and space saving of a retreaded tire manufacturing apparatus and to form a cushion rubber layer formed on a retreaded tire base tire. It is possible to form a cushion rubber layer having high uniformity for a plurality of types of base tires while improving the uniformity of the thickness of the tire, thereby improving the quality of the retreaded tire.

The invention of claim 1 is a method for manufacturing a retread tire in which a tread member is attached to a pedestal tire via a cushion rubber layer to manufacture a retread tire, and the ribbon-like rubber constituting the cushion rubber layer is used as the pedestal tire. And a winding step of forming the cushion rubber layer by spirally winding the supplied ribbon-like rubber around the base tire while abutting the side portions thereof.
According to a second aspect of the present invention, in the method for manufacturing a retread tire according to the first aspect, in the winding step, the winding start and end positions of the ribbon-like rubber are affixed range of the tread member of the base tire. The ribbon-like rubber is wound so as to be located on both outer sides.
According to a third aspect of the present invention, in the method for manufacturing a retread tire according to the first or second aspect, the supplying step supplies the ribbon-shaped rubber to the base tire while extruding it.
The invention according to claim 4 is a retread tire manufacturing apparatus for manufacturing a retread tire by attaching a tread member to a pedestal tire via a cushion rubber layer, and the ribbon-like rubber constituting the cushion rubber layer is used as the pedestal tire. And a winding means for forming the cushion rubber layer by spirally winding the supplied ribbon-like rubber around the base tire while abutting the side portions thereof. .
According to a fifth aspect of the present invention, in the retread tire manufacturing apparatus according to the fourth aspect, the supply means includes an extruder for extruding the ribbon-like rubber, and the ribbon-like rubber is extruded by the extruder. It supplies to the said base tire, shape | molding, It is characterized by the above-mentioned.
According to a sixth aspect of the present invention, in the retread tire manufacturing apparatus according to the fifth aspect, the winding means includes means for supporting the base tire and rotating it around an axis, and a surface of the rotating base tire. And a displacement means for displacing the winding position of the ribbon-like rubber supplied to the base tire by relatively moving the extruder.

  According to the present invention, it is possible to reduce the size and space-saving of a manufacturing apparatus for a retread tire, and to improve the uniformity of the thickness of the cushion rubber layer formed on the base tire of the retread tire, while maintaining a plurality of types of bases. A highly uniform cushion rubber layer can be formed on the tire, and the quality of the retread tire can be improved.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
Similar to the above-described conventional manufacturing apparatus, the retread tire manufacturing apparatus of the present embodiment removes tread rubber and the like from the tire before retreading by removal processing (for example, buffing) to form a base tire DT, and the surface ( A cushion rubber member is bonded to the rehabilitation surface to form a cushion rubber layer. Further, a tread for rehabilitation such as an unvulcanized tread rubber or a vulcanized tread rubber (precure tread) on the outer surface side centered on the outer peripheral surface of the base tire DT with at least the cushion rubber layer interposed therebetween. A member (rehabilitated tread) is arranged, and a rehabilitated tire is manufactured by attaching a tread member to the base tire DT via a cushion rubber layer.

  However, in this manufacturing apparatus, the cushion rubber layer is formed by, for example, arranging a ribbon-shaped unvulcanized cushion rubber member (ribbon-shaped rubber) having a predetermined cross-sectional shape on the surface of the base tire DT. Different from the manufacturing equipment.

FIG. 1 is a perspective view schematically showing a schematic configuration of a retread tire manufacturing apparatus according to the present embodiment.
As shown in the figure, the retreaded tire manufacturing apparatus 1 includes a holding device (holding stand) 10 for holding a base tire DT, and a ribbon-shaped rubber supply means 20 arranged to face the outer peripheral surface of the base tire DT. The moving means 30 of the supplying means 20 provided on the upper surface side, and the articulated arm 40 for moving the moving means 30 as a whole.

  The holding device 10 is a support (holding) means for rotatably supporting the base tire DT and rotating it around the axis (arrow K in the figure). The base tire DT has its axis (rotation axis) direction substantially horizontal. Rotate at a predetermined speed around the axis while maintaining. In addition, the holding device 10 is installed such that a pair of substantially prismatic side frames (frames) 11 and 12 are spaced apart from each other on the floor surface or the like and extend substantially in parallel and vertically upward. At the same time, their upper ends are connected to each other by a square plate-like upper frame 13 to form a gate shape.

  The holding device 10 includes a holding rim for detachably mounting and holding the base tire DT between the side frames 11 and 12, and each of the side frames 11 and 12 having the holding rim attached concentrically. Are provided with rotating shafts (not shown) rotatably supported via bearing members or the like, the base tire DT is held by a holding rim, and the inner positions of the frames 11, 12, 13 are used as fulcrums (centers). It is designed to rotate. In addition, the holding device 10 includes a driving source such as a motor for rotating the rotating shaft at a predetermined rotational speed around the axis, and a transmission mechanism (for example, a plurality of gears) that transmits the rotational force to the rotating shaft. Alternatively, a well-known rotation drive means (not shown) such as a drive means having a transmission belt and a pulley or the like) is provided, and thereby the base tire DT held by the rotation shaft and the holding rim is integrally rotated.

  The supply means 20 is for supplying the ribbon-shaped rubber constituting the cushion rubber layer toward the surface (rehabilitated surface) of the base tire DT. Here, the extruder 21 extrudes the ribbon-shaped rubber. The ribbon-shaped rubber immediately after being molded and extruded (molded) is supplied to the base tire DT. The extruder 21 includes a cylinder 22 for heating and kneading rubber supplied from a hopper (not shown), an extrusion head 23 attached to a tip portion (left end portion in the drawing) on the base tire DT side, and the like. The unvulcanized rubber is extruded from an opening (rubber extrusion (discharge) port) of a base (not shown) provided at the tip of the extrusion head 23, for example, a dimension according to the thickness of the cushion rubber layer to be formed, etc. A ribbon-like rubber having a predetermined cross-sectional shape (here, a rectangular cross section) such as a substantially rectangular shape is formed. The supply means 20 continuously supplies the ribbon-like rubber to a predetermined position of the base tire DT by the extruder 21 and presses it against the surface of the base tire DT so that the rubber is adhered by the adhesive force of the rubber.

  In addition, the extruder 21 which this supply means 20 has compared with the above-mentioned conventional extruder 110 (refer FIG. 3) which shape | molds a cushion sheet, compared with the ribbon-shaped rubber | gum which is narrower (for example, about 25 mm). The size may be small (for example, about 25 mm in diameter), and the size of the base tire DT and the entire apparatus is also small. Accordingly, in this extruder 21, the temperature of the machine body including the extrusion head 23 can be adjusted by a simpler apparatus. Here, a relatively large apparatus such as the hot water apparatus 112 (see FIG. 3) is used. Without installing, a band heater (electric heater) (not shown) is attached to each part of the machine, and its on / off is controlled based on the temperature measurement result of the temperature measuring means (not shown), and the machine, internal rubber, etc. Adjust the temperature.

  The moving means 30 has the extruder 21 of the supply means 20 mounted on the upper surface side, supports the extruder 21 from the lower side, and holds the extruder 21 on the surface of the base tire DT held by the holding device 10. And a base 32 provided at the upper end of the support 31, a lower table 33 disposed on the upper surface side of the base 32, and an upper surface side of the lower table 33. The upper table 34 and the like arranged in

  The support column 31 has a substantially cylindrical shape, and is movably disposed on one front side (right side in the drawing) of the holding device 10 with its longitudinal direction oriented in a substantially vertical direction. In addition, an articulated arm 40 extending from one side frame 11 of the holding device 10 is connected to the support 31.

  The multi-joint arm 40 includes two substantially long plate-like arm members 41 and 42, one end portions of the arm members 41 and 42, and the other end portions of the arm members 41 and 42. It connects with the lower part side via the connection members 43, 44, and 45, respectively. Each of these connecting members 43, 44, 45 is a joint (joint member) that supports the arm members 41, 42 so as to be rotatable in a horizontal plane, and the articulated arm 40 includes the arm members 41, 42 and the support column 31. For example, the support 31 and the moving means 30 are mainly connected to the holding device 10 by rotating the connecting members 43, 44, 45 with a driving force of a driving means (not shown) made of a motor or the like. Move on the front side. At the same time, the column 31 is rotated in the circumferential direction, and the position and orientation of the column 31 and the moving means 30 with respect to the base tire DT are relatively displaced and arranged at a predetermined position and orientation, and each rotation (rotation) is stopped. In this state, the column 31 and the moving means 30 are maintained in that state.

  A base (base plate) 32, which is a substantially rectangular plate-like member, is attached to the upper end portion of the column 31 so that the base is located horizontally and the vicinity of the center position of the lower surface thereof is positioned on the column 31. In the moving means 30 of the present embodiment, a lower table 33 and an upper table 34 that are parallel to each other and an extruder 21 are arranged on the upper surface side of the base 32 so as to overlap each other in the upward direction. 33 and the upper table 34 respectively cause the extruder 21 to move in the X direction with respect to the upper surface of the base 32 (in the figure, the longitudinal direction of the upper surface of the base 32 and parallel to the axis of the base tire DT) and the X direction. The moving table (XY table) is configured to move in the Y direction (in the drawing, the width direction of the upper surface of the base 32 and the direction orthogonal to the axis of the base tire DT).

  Specifically, in this moving means 30, when viewed from above, the lower table 33 is a plate-like member smaller than the base 32, and the upper table 34 is narrower in the X direction than the lower table 33 and on the upper surface. It forms in the plate-shaped member of the magnitude | size which can mount the extruder 21, respectively. Further, for example, a pair of parallel guide rails (not shown) extending in the X direction (in the drawing, a direction parallel to the axis of the base tire DT) is provided on the upper surface of the base 32, and each guide rail is provided on the lower surface of the lower table 33. A plurality of slide bearings (not shown) which are slidably engaged with each other are fixed, and the lower table 33 can be moved (slid) in the X direction on the upper surface of the base 32 through these and the like. Is engaged. Similarly, for example, a pair of parallel guide rails (not shown) extending in the Y direction (in the drawing, a direction perpendicular to the axis of the base tire DT) is provided on the upper surface of the lower table 33, and each guide is provided on the lower surface of the upper table 34. A plurality of slide bearings (not shown) that are slidably engaged with the rails are fixed, and the upper table 34 is moved (sliding) in the Y direction on the upper surface of the lower table 33 through these and the like. Engagement possible.

  In this way, the moving means 30 is configured so that the lower table 33 and the upper table 34 can be moved in the X direction and the Y direction independently of each other, and driving means are provided for each of the lower table 33 and the upper table 34. The table 33 and the upper table 34 are moved in each direction independently of each other and based on a predetermined pattern. By each movement in the X direction and the Y direction, the moving means 30 moves the extruder 21 placed on the upper surface together with the upper table 34, for example, in a direction (X direction) parallel to the axial direction of the base tire DT. , And move in a direction perpendicular to it (Y direction, a direction approaching and separating from the base tire DT). Thereby, the front-end | tip part of the extrusion head 23 of the extruder 21 is arrange | positioned facing the predetermined sticking position of the base tire DT hold | maintained by the holding | maintenance apparatus 10, and when winding ribbon-like rubber, the extruder 21 (especially The position of the mouth opening of the extrusion head 23) is moved along the surface of the base tire DT.

  As the driving means for moving the tables 33 and 34, known driving means such as a rack and pinion mechanism or a linear driving mechanism using a ball screw and a ball nut can be used, and the driving means is, for example, a ball screw and a ball nut or the like. In this case, the ball nut is fixed to the lower surface of each table 33, 34 and the like, and a ball screw disposed in each direction (X direction and Y direction) is engaged therewith. Each ball screw is rotated by controlling the number of rotations, speed, etc. by a stepping motor, and the ball nut is displaced in the longitudinal direction of the ball screw by a screw action to move each table 33, 34 in each direction. Further, in this moving means 30, a pair of substantially plate-like side walls 35 are provided over the entire upper ends of both ends of the base 32 in the X direction. Move between the side walls 35 in the X direction.

  In addition, the moving means 30 includes a rotating means (not shown) that causes the extruder 21 to rotate (turn) (rotate in the figure by an arrow θ) around a vertical axis orthogonal to the X direction and the Y direction. The rotating means includes, for example, a rotary connecting member that is provided between the extruder 21 and the upper table 34 or between the base 32 and the support column 31 and that has a bearing or the like that rotatably connects them to each other. It consists of rotational drive means (not shown) etc. which have a motor etc. which drive the extruder 21 alone or with the base 32 grade | etc.,. The moving unit 30 moves the extruder 21 in the horizontal plane by the movement of the lower table 33 and the upper table 34 in the X direction and the Y direction, and rotates (arrow θ) in the horizontal plane by the rotating unit to perform the extrusion. The position of the base opening at the tip of the head 23 and the extrusion (discharge) direction of the ribbon-like rubber are changed. Combining these movements and rotations, the extruder 21 is controlled to move in each direction and the like, and while the extruder 21 is moved and rotated, the ribbon-like rubber is pushed out from the extruder 21 toward the surface of the base tire DT. Then, it is supplied from a predetermined direction (for example, a substantially normal direction).

  The manufacturing apparatus 1 of the present embodiment is held (supported) by the holding device 10 and rotated around the axis while continuously extruding the ribbon-like rubber by the extruder 21 of the supply means 20 as described above. The ribbon-shaped rubber immediately after the extrusion is applied to the surface (outer surface) of the base tire DT, and the like is attached to a predetermined position. At the same time, the moving means 30 displaces the extruder 21 in the axial direction and the radial direction of the rotating base tire DT, and moves it in the horizontal plane along the surface. As a result, the entire range in which the ribbon-shaped rubber is wound (herein referred to as the winding range) while maintaining a predetermined distance from the surface of the base tire DT at the base opening (rubber discharge port) of the extrusion head 23. Then, the winding is gradually moved in the winding direction from one end side to the other end side. In accordance with this movement, the supply position of the ribbon-shaped rubber is sequentially displaced along the surface of the base tire DT, and the ribbon-shaped rubber is sequentially wound over the entire winding range of the surface of the base tire DT.

  Thus, in this manufacturing apparatus 1, the displacement means for displacing the supply position of the ribbon-shaped rubber is constituted by the moving means 30 that moves the extruder 21 along the surface of the rotating base tire DT. The supply means of the ribbon-like rubber supplied to the base tire DT and the winding position thereof are sequentially displaced along the surface of the base tire DT by the displacing means. This displacement means also constitutes winding means for winding the ribbon-shaped rubber supplied from the extruder 21 around the table tire DT together with the holding device 10 that supports and rotates the table tire DT, A cushion rubber layer is formed as a whole by winding around the entire winding range of the base tire DT.

FIG. 2 is a cross-sectional view schematically showing the surface of the base tire DT around which the ribbon-like rubber is wound by this winding means, and shows the outer peripheral surface portion in the cross section in the width direction of the base tire DT.
In this embodiment, as shown in the figure, the winding means gradually shifts the ribbon-shaped rubber 50 having a predetermined width H along the surface of the rotating base tire DT at a speed corresponding to the width H and the like. It winds in multiple times so that it may follow a substantially circumferential direction, and it winds continuously over the whole winding range on the base tire DT periphery.

  At that time, the ribbon-like rubber 50 is spirally wound around the base tire DT while abutting side portions (in this case, side faces) in the width direction, and is attached to the surface of the base tire DT. In this manner, at least one layer of the ribbon-like rubber 50 is laminated while suppressing the occurrence of overlapping portions and gaps on the respective side portions, and the cushion rubber layer 51 having a predetermined thickness covering the entire winding range. Is formed on the surface of the base tire DT.

Next, procedures and operations for manufacturing a retread tire by the manufacturing apparatus 1 described above will be described.
Each procedure below includes, for example, a microprocessor (MPU) that performs various data processing, analysis, calculation, etc., a ROM that stores various programs, a RAM that stores temporary data for processing, etc. This is controlled and executed by a control device (not shown) including a microcomputer provided with the storage means and the like, an interface for connection with an external device, and the like. At that time, based on a predetermined program, a preset condition, etc., each unit of the apparatus including the holding device 10, the extruder 21, the moving unit 30, and each driving unit thereof is operated at a predetermined timing. It is activated and executed.

  When manufacturing a retreaded tire with this manufacturing apparatus 1 (see FIG. 1), first, as described above, tread rubber and the like are removed from the tire before retreading by removing processing (for example, buffing or the like) to form a base tire DT, The base tire DT is held (supported) by the holding rim of the holding device 10. Subsequently, the moving means 30 and the extruder 21 provided on the upper surface side thereof are arranged at predetermined positions with respect to the surface of the base tire DT (rehabilitation surface such as a buff surface) by the multi-joint arm 40.

  Next, the ribbon-like rubber 50 constituting the cushion rubber layer 51 is supplied toward the surface (reclaimed surface) of the base tire DT while being extruded by the extruder 21, and the supplied ribbon-like rubber 50 is extruded. Immediately after that, it is pasted by pressing against the surface of the base tire DT. At the same time, the base tire DT is driven by the rotation driving means of the holding device 10 to rotate around the axis at a predetermined speed, and the ribbon-like rubber 50 continuously supplied from the extruder 21 is the abbreviation of the rotating base tire DT. While being wound along the circumferential direction, the extruder 21 is moved along the surface of the base tire DT by the moving means 30 in conjunction with the winding. At that time, depending on the supply speed (extrusion speed) of the ribbon-shaped rubber 50 by the extruder 21, the width of the ribbon-shaped rubber 50, the diameter (peripheral length) of the base tire DT, the rotational speed of the base tire DT and the extruder 21. The surface of the base tire DT is controlled while controlling the moving speed of the belt 21 and suppressing the occurrence of defects such as wrinkles or the like on the overlapping portions, gaps, or surface of the ribbon-like rubber 50. Are gradually displaced at a predetermined speed along the line.

  In this way, the supplied rubber ribbon 50 is spirally wound around the base tire DT while abutting the side portions (side surfaces) thereof to form the cushion rubber layer 51 (see FIG. 2). At that time, in this manufacturing apparatus 1, the winding of the ribbon-like rubber 50 is started from one outer side of the above-described tread member pasting range (referred to here as the pasting range) of the base tire DT, and this pasting range is sandwiched. Wind toward the opposite side, and finish at the other outside of the pasting range. That is, in this manufacturing apparatus 1, the ribbon-shaped rubber 50 is placed outside the pasting range of the base tire DT so that the winding start and end positions of the ribbon-like rubber 50 are located on both outer sides of the pasting range of the base tire DT. Wrap up to. Thereby, each winding end of the ribbon-like rubber 50 is disposed on the opposite side across the pasting range, and the cushion rubber layer 51 is placed over the entire tread member pasting range of the base tire DT. Form to the outside to cover.

  Next, the manufacturing apparatus 1 stops the extrusion of the ribbon-like rubber 50 by the extruder 21 and the rotation of the base tire DT by the holding device 10 and cuts the ribbon-like rubber 50 by a cutting means (not shown). Then, the supply of the ribbon-like rubber 50 to the base tire DT is stopped, and the extruder 21 is pulled away from the base tire DT. After that, the manufacturing apparatus 1 executes the same process for manufacturing a retread tire as in the past, for example, removes the base tire DT from the holding apparatus 10 and transfers it to a tread member molding machine (not shown), and the cushion rubber layer 51 Place a new tread member for rehabilitation on the outer surface. Thus, after attaching a tread member to the surface (rehabilitated surface) of the base tire DT via the formed cushion rubber layer 51, a rehabilitated tire is manufactured through a vulcanization process or the like.

  In this vulcanization process, when the tread member to be attached to the base tire DT is a pre-vulcanized tread rubber with a pattern (PCT: precure tread), the formed tire is accommodated in a vulcanization can, A retreaded tire is manufactured by vulcanizing and bonding the tread member. On the other hand, when the tread member is an unvulcanized tread rubber with no pattern, the formed tire is accommodated in a vulcanization mold, and the tread member is vulcanized and molded inside to form a tread pattern. For example, retreaded tires are manufactured by vulcanizing and molding the tires.

  As described above, in the present embodiment, the ribbon rubber 50 is spirally wound around the base tire DT to form the cushion rubber layer 51, so that each component such as the die of the extruder 21 is changed or adjusted. The cushion rubber layer 51 according to each can be formed in the base tire DT from which width, a size, or a shape differs. That is, in this manufacturing apparatus 1, the amount of movement and rotation (θ in FIG. 1) of the extruder 21 by the moving means 30 in each direction (X and Y directions in FIG. 1) is controlled and changed to change the ribbon-like rubber. By adjusting and changing the winding mode such as the number, amount, or range of 50 windings, the cushion rubber layer 51 having various shapes such as width and circumference can be formed. As a result, it is possible to appropriately cope with a plurality of types of base tires DT, and to flexibly and easily respond to changes in the width, size, or shape of the base tire DT and the cushion rubber layer 51, and the cushion rubber layer 51 suitable for each. Can be formed.

  Accordingly, it is not necessary to prepare and store a plurality of types of cushion rubber members (for example, a plurality of cushion sheets having different widths) in advance as in the past, and the man-hours and work for that purpose and the storage space are not required. Etc. can be reduced. In addition, the cushion rubber layer 51 can be easily formed (for example, affixing the ribbon-like rubber 50), and the labor and man-hours can be reduced, thereby improving the productivity of retread tire manufacturing.

  Further, since the cushion rubber layer 51 is formed by arranging the ribbon-like rubber 50 having a predetermined thickness, the thickness of each part of the cushion rubber layer 51 and the uniformity in the width direction and the like are increased, and the cushion rubber layer to be formed is also formed. The high uniformity of 51 can be maintained even for a plurality of types of base tires DT having different widths. As a result, in particular, the cushion rubber layer 51 can be prevented from being partially thickened. Therefore, heat generation due to repetitive strain associated with the use of the above-described retreaded tire can be suppressed to prevent the generation of a heat-breaking nucleus. The heat generation durability and quality can be further improved.

  At the same time, according to the manufacturing apparatus 1, the cushion rubber layer 51 having a high uniformity in thickness and the like can be formed even on the base tire DT having a different surface curvature in the tire width direction cross section. The influence on the outer shape of the tire, such as the vicinity of the shoulder portion (shoulder out), can be reduced. Accordingly, the shape accuracy of the retreaded tire can be increased, and for example, the rectangular ratio in the vicinity of the shoulder portion can be prevented from becoming larger than 1.0, so that the heat generation durability of the retreaded tire can be further increased.

  Furthermore, in this manufacturing apparatus 1, when the cushion rubber layer 51 is formed, since the ribbon-like rubber 50 is wound spirally, the winding start and end positions can be arranged at different positions on the base tire DT, and both end portions thereof are It is possible to prevent the overlap from occurring due to being overlapped with each other. As a result, since the cushion rubber layer 51 can be prevented from being partially thickened, the uniformity in the circumferential direction of the cushion rubber layer 51 and the retreaded tire can be further increased. It is possible to suppress the heat generation durability and quality of the retreaded tire.

  In addition, in this manufacturing apparatus 1, the cushion rubber member (here, the ribbon-like rubber 50) supplied to the base tire DT may be narrower than the conventional manufacturing apparatus (see, for example, FIG. 3). As the supply means 20 (here, the extruder 21), an extruder 21 that is smaller than the conventional one, for example, an extruder 21 having a relatively small diameter that is used for molding a filling rubber (filled rubber) can be used. . Accordingly, the extruder 21 and the manufacturing apparatus 1 as a whole can be further reduced in size, and the space for installing them can be reduced. Restrictions can be reduced. At the same time, the temperature of the extruder 21 including the extrusion head 23 can be adjusted by the on / off control using the band heater described above, so that a large-sized device such as a conventional hot water device (see FIG. 3) is not required. Therefore, the space required for installing the apparatus can be greatly reduced, and the space in the factory can be effectively utilized.

  In addition, here, the ribbon-shaped rubber 50 is spirally wound around the base tire DT while abutting the sides, so that the cushion rubber layer 51 is formed. For example, the ribbon-shaped rubber 50 having the same width is partially overlapped and wound. Compared to the case, the number of windings and the amount of winding can be reduced, and the cushion rubber layer 51 can be formed in a shorter time and more efficiently, so that the productivity of retreaded tire manufacturing can be improved. At the same time, when the ribbon-like rubber 50 is overlapped, a partially thick portion (overlapping portion) and a thin portion are formed, and a step, unevenness or the like is formed on the surface, and the thickness of the cushion rubber layer 51 is uneven. However, in this manufacturing apparatus 1, the quality and uniformity of the cushion rubber layer 51 can be effectively suppressed by suppressing the generation of air in the stepped portion or the recessed portion formed on the surface. It can also be increased.

  Therefore, according to the present embodiment, the retreaded tire manufacturing apparatus 1 can be reduced in size and space-saving, and the thickness of the cushion rubber layer 51 formed on the base tire DT of the retreaded tire can be increased. On the other hand, a highly uniform cushion rubber layer 51 can be formed for a plurality of types of base tires DT, and the quality of the retread tires can be improved.

  Here, as in the present embodiment, when the cushion rubber layer 51 is formed, it is more desirable that the winding start and end positions of the ribbon-like rubber 50 be positioned on both outer sides of the pasting range of the tread member of the base tire DT. . By doing so, the cushion rubber layer 51 can be formed wider than the tread member, and can be reliably disposed between the tread member and the base tire DT, and the tread member can be disposed on the base tire DT with the cushion rubber layer 51 interposed therebetween. , Can be more reliably pasted. At the same time, both end portions of the wound ribbon-like rubber 50 can be reliably arranged at different positions on the base tire DT.

  Further, in this manufacturing apparatus 1, the extruder 21 is used as the supply means 20 for the ribbon-like rubber 50. However, as the supply means 20, for example, the ribbon-like rubber 50 is temporarily wound around a reel or the like, and is drawn out from the ribbon-like rubber 50. Other supply means such as supplying rubber 50 can also be used. However, as in this embodiment, when the extruder 21 is used as the supply means 20 and the ribbon-shaped rubber 50 is supplied to the base tire DT while being extruded and directly wound, the ribbon-shaped rubber 50 is Etc., and can be supplied to the base tire DT in a clean state with a relatively high temperature and high adhesive strength. As a result, foreign matter can be prevented from being mixed between the members, and the ribbon-like rubber 50 can be directly attached to the base tire DT without using an adhesive or the like, so that the quality and productivity of the retreaded tire can be further improved. The supply means 20 preferably uses an extruder 21 as in the manufacturing apparatus 1.

  In this embodiment, as the holding device 10, a double-sided holding device 10 that supports and holds the base tire DT from both sides by a pair of side frames 11 and 12 is used. There is no need to have a holding type, for example, other holding devices such as a rim (expanding rim) capable of expanding and contracting is attached to one end of the rotating shaft to hold the base tire DT in a cantilevered manner. 10 may be used.

  Similarly, the holding device 10 includes a device generally used for manufacturing a retread tire, for example, a buffing machine for removing tread rubber, a tread molding machine (applicator for unvulcanized tread rubber), or PCT. A holding device 10 having a similar function provided in a molding machine (applicator for precure tread rubber) or the like can also be used. That is, the manufacturing apparatus 1 does not have to be configured as an independent apparatus including the holding device 10 and the like, and the supply device 20 and the movement are added to the existing device including the holding device 10 that holds and rotates the base tire DT. It can also be realized by adding means 30 or the like.

  Further, in this manufacturing apparatus 1, the moving unit 30 moves the extruder 21 along the surface of the rotating base tire DT, and the winding position of the ribbon-like rubber 50 around the base tire DT is displaced. The displacement of is performed, for example, by moving or turning the base tire DT without moving the extruder 21, or by combining both movement of the extruder 21 and the base tire DT, etc. May be moved relatively along the surface of the base tire DT. Further, the extruder 21 may be moved by other means other than the moving means 30, for example, by the articulated arm 40 described above.

  In addition, in this manufacturing apparatus 1, the ribbon-like rubber 50 is wound around the base tire DT to form the cushion rubber layer 51. At this time, the ribbon-like rubber 50 may be directly wound around the surface of the base tire DT. Further, other members (for example, filling rubber for filling holes) may be partially or wholly wound around the base tire DT. Accordingly, when the ribbon-like rubber 50 is wound around the base tire DT, the ribbon-like rubber 50 is not limited to the case where the ribbon-like rubber 50 is wound around the surface of the base tire DT from which the tread rubber has been removed. The case where it winds around the outer surface side after arrangement | positioning is also included.

  In this embodiment, a rubber member having a rectangular cross section is used as the ribbon rubber 50. However, the ribbon rubber 50 may be, for example, a string shape, a strip shape, a narrow sheet shape, or a substantially trapezoidal cross section. What is necessary is just to use what was shape | molded suitably according to each situation, such as the external shape of each base tire DT, the form of the cushion rubber layer 51 to form, etc. in a curved shape. This refers to a long rubber member.

It is a perspective view which shows typically schematic structure of the manufacturing apparatus of the retread tire of this embodiment. It is sectional drawing which shows typically the surface of the base tire which wound ribbon-shaped rubber by the winding means of this embodiment. It is a side view which shows typically schematic structure of the manufacturing apparatus of the conventional retreaded tire.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Rehabilitation tire manufacturing apparatus, 10 ... Holding device, 11 ... Side frame, 12 ... Side frame, 13 ... Upper frame, 20 ... Supply means, 21 ... Extrusion Machine, 22 ... cylinder, 23 ... extrusion head, 30 ... moving means, 31 ... support, 32 ... base, 33 ... lower table, 34 ... upper table, 35. .. side wall, 40 .. articulated arm, 41... Arm member, 42... Arm member, 43 .. connecting member, 44 .. connecting member, 45. -Ribbon rubber, 51 ... cushion rubber layer, DT ... stand tire.

Claims (6)

A method for manufacturing a retread tire by manufacturing a retread tire by attaching a tread member to a base tire via a cushion rubber layer,
A supplying step of supplying a ribbon-shaped rubber constituting the cushion rubber layer to the base tire;
A winding step of forming the cushion rubber layer by spirally winding the supplied rubber-like rubber around the base tire while abutting the side portions thereof;
The manufacturing method of the retreaded tire characterized by having. In the manufacturing method of the retreaded tire described in Claim 1,
In the winding step, the ribbon-shaped rubber is wound so that winding start and end positions of the ribbon-shaped rubber are located on both outer sides of the tread member pasting range of the base tire. Tire manufacturing method. In the manufacturing method of the retreaded tire described in Claim 1 or 2,
In the supplying step, the ribbon-like rubber is supplied to the tire while being extruded and formed. A retread tire manufacturing device for manufacturing a retread tire by attaching a tread member to a base tire via a cushion rubber layer,
Supply means for supplying a ribbon-like rubber constituting the cushion rubber layer to the tire;
Winding means for forming the cushion rubber layer by spirally winding the supplied rubber-like rubber around the base tire while abutting the side portions thereof;
An apparatus for manufacturing a retread tire, comprising: In the retreaded tire manufacturing apparatus according to claim 4,
The said supply means has an extruder which extrude-molds the said ribbon-shaped rubber | gum, The said rubber | gum-shaped rubber is extruded and shape | molded by this extruder, It supplies to the said base tire, The manufacturing apparatus of the retreaded tire characterized by the above-mentioned. In the manufacturing apparatus of the retreaded tire described in Claim 5,
The winding means supports the base tire and rotates it around an axis, and moves the extruder relative to the surface of the rotating base tire, and supplies the base rubber of the ribbon-like rubber to be supplied. And a displacement means for displacing the winding position with respect to the tire.

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