JP5052388B2 - Unvulcanized tire manufacturing apparatus and method - Google Patents

Description

  The present invention relates to an apparatus and a method for manufacturing an unvulcanized tire using a film inner liner, and more particularly to an apparatus and a method for manufacturing an unvulcanized tire in which a film inner liner is attached to the inner surface of a tire molded body.

  As shown in FIG. 7 (sectional view showing the structure of a conventional pneumatic tire), the pneumatic tire has bead wires 72 for fixing the tire to the rim at both ends in the tire width direction. A carcass 73 extending in a toroidal shape is arranged around the bead wire 72 so as to wind up from the inside to the outside of the tire. A belt layer 74 for reinforcing the carcass 73 is disposed outside the carcass 73 in the tire radial direction (upper side in the drawing), and a tread portion 75 is provided outside the belt layer 74.

Further, sidewall rubber 76 is attached to both sides of the carcass 73, and on the other hand, an inner liner 77 made of a film-like sheet is disposed inside the carcass 73 in order to keep the tire air pressure constant. .
The inner liner 77 is formed by attaching a film-like sheet cut to a length equal to or greater than the circumference of the tire molding drum to the tire molding drum, and heat-treating the ends of the sheets.

FIG. 8 is a view showing a state in which a film-like sheet is pasted on a tire molding drum in order to mold a conventional inner liner, FIG. 8A is a perspective view of a tire molding drum on which a film-like sheet is pasted, and FIG. It is the side view.
As shown in FIG. 8A, the tire molding drum 81 is shown in the drawing while adsorbing the leading end portion 82a of the film-like sheet 82 supplied from the supply means (not shown) by the adsorption means (not shown) on the molding drum 81. Rotate in the direction of the arrow and take up.

  After the film-like sheet 82 is wound on the tire molding drum 81, as shown in FIG. 8B, the rear end portion 82b is stacked on the front end portion 82a to form a joint portion 82c, and the joint portion 82c is heated. While pressing, the film inner liner is molded.

In the joint part 82c, since the two film-like sheets 82 are heat-welded, the joint part 82c is thicker than the part not subjected to the heat treatment, and the rigidity is increased.
Note that this phenomenon is not limited to the case where an inner liner is manufactured by welding films, but for example, an adhesive is applied to the rear end portion 82b, and the front end portion 82a and the rear end portion 82b are bonded to each other, thereby forming a film inner liner. This can also occur in the case of manufacturing. That is, when the two film-like sheets 82 of the joint portion 82c are integrated by solidifying the adhesive, the rigidity of the portion is increased and the extensibility is lowered.

  As a result, when the cylindrical tire constituent member is expanded to the shape of a raw tire, only the joint portion 82c subjected to the heat treatment has higher rigidity than the portion not subjected to the heat treatment, so that the entire tire is uniform. The result is that the tire uniformity is deteriorated.

In order to solve this problem, a belt-like film (ribbon) is spirally wound on a tire molding drum to form an air permeation prevention layer (film inner liner), and each rubber member constituting the tire is formed on the outer periphery. A method for arranging and manufacturing an unvulcanized tire is known (see Patent Document 1).
In this unvulcanized tire manufacturing method, since the overlapping portions of the film are formed at equal intervals in the tire width direction, even if the tire component attached on the tire molding drum is expanded, the entire tire is uniformly expanded. can do.

  However, in this method for producing an unvulcanized tire, when the tire constituent member on the molding drum is bulged and deformed so as to have a shape close to the tire, the joint portion (the overlapping portion of the film) and the other portion (the non-joint) Part)), the difference in elongation between the joint part and the non-joint part remains after the molding of the tire, and the joint part of the belt-like film opens due to the residual stress in the member due to the difference in elongation. The film layer may break. In addition, there is a problem that the installation accuracy of the members is not stable.

In order to solve the above problem, the present applicant has previously described a tire molded body (here, a tire component excluding an inner liner, which refers to an unvulcanized tire molded into a shape close to the shape of a product tire) Proposed a method for manufacturing unvulcanized tires without causing the inner liner to bulge and deform by pasting the edges of the film cut to fit the width of the film, and pasting the edges together on the entire interior surface of the tire molding ( Patent Document 2).
However, this method for producing an unvulcanized tire has a problem that it takes a tact time because it is necessary to cut a film to be attached to the inside of the tire molded body into a predetermined length. Further, there is a possibility that an air residue may be generated between the film and the inner surface of the tire molded body in a portion where the curvature radius of the tire molded body inner surface is small.

In addition, a method of manufacturing a pneumatic tire by fitting a film formed in a cylindrical shape without a joining portion on a tire molding drum and winding another tire constituent member around the outer periphery of the film is also known (see Patent Document 3). The cylindrical film requires a space for storage, so that it is difficult to handle and the productivity is poor.
Japanese Patent Laid-Open No. 10-16509 Japanese Patent Application No. 2006-307719 Japanese Patent No. 3159886

  The present invention has been made in order to solve the above-mentioned problems, and its purpose is to form an unvulcanized tire without bulging and deforming the film-like inner liner, and to form the film-like inner liner into a tire. It is to reduce the tact time to be attached to the inner surface of the body.

The invention of the present application is an apparatus for producing an unvulcanized tire having a film layer made of a belt-like film on the inner surface of a tire molded body, the rotating means for rotating the tire molded body in the tire circumferential direction, and the inner surface of the tire molded body A film supply means for supplying the belt-like film to the film, a film sticking means for sticking the belt-like film with the widthwise edges thereof being overlapped along the inner peripheral surface of the rotating tire molded body, and the inner surface of the tire molded body And a film crimping means for crimping the film attached to the film.
The invention of the present application is a method for producing an unvulcanized tire having a film layer made of a belt-like film on the inner surface of a tire molded body, the step of supplying the belt-like film to the inner surface of the tire molded body, A step of rotating the body, a step of laminating the band-shaped film with the widthwise edges thereof being adhered along the inner peripheral surface of the rotating tire molded body, and the pasted film on the entire surface of the tire molded body And a step of crimping.

  ADVANTAGE OF THE INVENTION According to this invention, an unvulcanized tire can be shape | molded without bulging and deforming a film-like inner liner, and peeling of inner liners can be prevented. Further, the tact time for attaching the film-like inner liner to the inner surface of the tire molded body can be reduced, and the productivity can be improved.

Hereinafter, an apparatus for manufacturing an unvulcanized tire according to an embodiment of the present invention will be described with reference to the accompanying drawings.
A film inner liner affixing device as an embodiment of an apparatus for producing an unvulcanized tire of the present invention includes a tire molded body holder for holding a tire molded body and a film inner liner (hereinafter simply referred to as a film) made of a thermoplastic resin. It consists of a film sticking device, which is a film sticking means for sticking the inner surface of the tire molded body in a spiral shape in the circumferential direction, and a film supply device for feeding the film to the film sticking device.

FIG. 1 is a front view showing a film sticking apparatus and a tire molded body holder.
The tire molded body holder 10 includes a plurality of (two shown above and below) pressing portions 11 corresponding to the rotating means of the present invention having a driving mechanism (not shown) such as a cylinder mechanism or a ball screw mechanism. The pressing portion 11 is fixed to a main body (not shown) of the tire molded body holder 10. The plurality of pressing portions 11 are arranged in an annular shape, and include a substantially planar contact portion 11a that contacts the molded tire T in the radial center direction.
When the tire molded body T is held, as shown in the figure, the tire molded body T is arranged inside the plurality of pressing portions 11, and the contact portion 11a of the pressing portion 11 is driven by a driving mechanism (not shown). Driving in the radial center direction of T, the contact portion 11a is brought into contact with the outer peripheral surface of the tire molded body T to press and hold the tire molded body T.

The pressing portion 11 of the tire molded body holder 10 is held by moving along the outer peripheral surface of the tire while the tire molded body T is held and the contact portion 11a is directed toward the center in the tire radial direction. The tire molded body T can be rotated in the tire circumferential direction. In addition, this molded tire is rotated intermittently or continuously at a predetermined pitch, and when rotating intermittently, the amount of rotation for each pitch is changed, and when rotating continuously, the rotational speed is changed depending on the setting. can do.
The film sticking device 20 sticks the film supplied from the film supply device 40 into the tire molded body T to form an inner liner.

2 is an enlarged perspective view of the film sticking device 20 and the film supply device 40 shown in FIG.
The film sticking device 20 can run on the floor surface in the Y-axis direction (tire width direction) in the drawing, and has a groove 21 having a predetermined width in the X-axis direction (method orthogonal to the Y-axis) in the drawing to stick a film. A carriage 22 which is a position changing means for changing the position in the tire width direction, a column 24 installed on a slide plate 23 slidable on the groove 21 of the carriage 22, and an upper end portion thereof are attached in the Y-axis direction. An arm 26, a rotary shaft 27 attached to the tip of the arm 26 so as to be rotatable in the X-axis direction, a driving device 25 comprising a motor or gear for rotating the rotary shaft 27 by a predetermined angle, and the other end of the rotary shaft 27 An L-shaped support plate 28 that supports a sticking portion 50, which will be described later, and a vertical plate 28a that is attached vertically downward and a horizontal plate 28b that extends in the X-axis direction from the lower end of the vertical plate 28a. The vertical center of the vertical plate 28a A cylindrical member 29 attached to the X-axis direction, is attached to the distal end of the horizontal plate 28b, while pull the film 42a from the film supply unit 40, consists attachment unit 50 for pasting the tire molded T inner surface.

The driving device 25 rotates the rotating shaft 27 by a predetermined angle, thereby rotating the film 42a supplied from the film supplying means via the support plate 28 and the attaching portion 50 attached to the other end of the rotating shaft 27. Rotating means for moving along an arc centered at 27. That is, the drive device 25, the rotating shaft 27, the support plate 28, and the pasting portion 50 constitute angle changing means for adjusting (changing) the angle of the film 42a to be stuck to the inner surface of the tire molded body T.
In the above description, the length of the column 24 is constant. However, a length changing unit such as a screw rod is provided inside the column 24, and the length of the column 24 is set by this length changing unit. If the arm 26 is moved upward, the height of the arm 26 can be changed in accordance with the tire size to be manufactured.
Moreover, you may comprise the length of the perpendicular direction of the vertical board 28b so that change is possible so that the position of the sticking part 50 can be easily match | combined with the inner surface of the tire molding T from which size differs.

The film supply device 40 includes a film roll 42 in which a belt-like film 42a is wound around a winding shaft 41. Both ends of the winding shaft 41 are rotatably supported by a support unit (not shown), and the film roll 42 is a film sticking device. It is configured to move in accordance with 20 movements. An adhesive is applied to one surface of the film 42a (the surface that contacts the inner surface of the tire molded body T).
A film 42 a pulled out in the Y-axis direction from the film roll 42 is a roller (described later) provided in the vertically downward direction while being twisted along the outer periphery of the columnar member 29 of the film sticking device 20 and inside the sticking portion 50. Is pulled out in the X-axis direction along the outer periphery of the.
Note that a release paper may be attached in advance to the adhesive-coated surface of the film 42a, and the film 42a may be supplied to the film sticking apparatus 20 while being peeled off with a release liner.

FIG. 3 is an enlarged view of the pasting portion 50 shown in FIG.
The affixing portion 50 has a box-shaped body 51a whose upper surface is open and extends vertically downward, and an outlet 51c for extending the film 42a to one end surface extending from the lower end of the box-shaped body 51a in the X-axis direction. A box 51 having a substantially L-shape as a whole, a roller 52 rotatably mounted inside the box 51, and an outlet of the box 51b. A cylindrical restraining roller 53 for restraining the film 42a pulled out from 51c to the inner surface of the tire molded body T, and a restraining roller support rod 54 that supports the restraining roller 53 in a rotatable manner and in contact with and away from the film 42a. It comprises a piston cylinder mechanism 56 that pushes the vicinity of an end portion of an upright rod 54a, which will be described later, provided at the upper end of the roller support rod 54 and moves the holding roller 53 away from the film 42a.

The restraining roller support rod 54 includes both support rods 54b that rotatably support both ends of the restraining roller 53, and a swing rod 54c that pivotally supports both support rods 54b joined to one end of the both support rods 54b. And an upright rod 54a extending in a direction perpendicular to both rods from a joint portion between one support rod 54b (on the right side in the figure) and the swing rod 54c.
The piston cylinder mechanism 56 is fixed to the box-shaped body 51 a by an arbitrary fixing means, and the tip of the piston is in contact with the side surface of the upright rod 54 a of the restraining roller support rod 54.
When the restraining roller 53 is separated from the film 42a, the piston cylinder mechanism 56 is driven to push and swing the upright rod 54a of the restraining roller support rod 54 in the direction of arrow A in the figure at the tip of the cylinder. In conjunction with the swinging of the upright rod 54a, the suppression roller 53 attached to the suppression roller support rod 54 swings in the direction of arrow B in the figure by a predetermined angle around the swinging rod 54c, and the film 42a. Separate from.

FIG. 4 is a diagram for explaining a procedure for sticking the film 42a to the inner surface of the tire molded body T by the film sticking apparatus 20 shown in FIG.
When the film 42a is attached to the inner surface of the tire molded body T using the film sticking device 20, first, the film 42a is supplied from the film supply device 40 to the film sticking device 20, and the film sticking device 20 is moved so that the tire The sticking part 50 is inserted into the center hole of the molded body T. That is, the film 42a is supplied to the inner surface of the tire molded body. Subsequently, the rotation shaft 27 (see FIG. 2) is rotated by the driving means 25, that is, the sticking portion 50 is swung in an arc shape around the rotation shaft 27, so that the holding roller 53 and the sticking portion of the sticking portion 50 are swung. The angle of the sticking surface of the film 42a drawn from 50 is changed to match the inclination of the inner surface of the tire molded body T in the width direction.

  Next, as shown in FIG. 4A, the tire molded body T is rotated by the pressing portion 11 shown in FIG. 1 while the front end portion of the film 42 a is pressed against the inner surface of the tire molded body T by the pressing roller 42. The part 50 sticks the film 42a in the tire circumferential direction while pulling out the film 42a from the film supply device 40 (see FIG. 4B). At this time, the driving means 25 and the carriage 22 (see FIG. 2) are controlled by a control means (not shown), so that the position of the sticking portion 50 and the sticking surface of the film 42a correspond to the inner peripheral sticking surface of the tire molded body T. The tire molded body T is rotated while changing the angle.

  Subsequently, the tire molded body T is rotated, and the film 42a is deformed by applying tensile stress and bending stress, and the film 42a and the widthwise edges thereof are attached to the inner surface of the tire molded body T in a circumferential spiral shape. The film 42a is continuously pasted so that the portions overlap (see FIG. 4C). At this time, by attaching the film 42a so that the overlapping portion (joint portion) of the films 42a is located in a portion having a small radius of curvature, such as a shoulder portion of the tire molded body T, air escapes from the overlapping portion. Air remaining can be prevented.

After affixing the film 42a to the entire inner surface of the tire molded body T, the film 42a is pressed against the inner surface of the tire molded body T by a film pressing device, and the unvulcanized tire is completed.
FIG. 5 is a side view of the film pressing device 30.
The film pressing device 30 includes two support columns 32 provided on the upper surface of a plate-shaped base 31 installed on the floor, a plate-shaped member 33a supported horizontally by the support columns 32, and upward from both ends thereof. A screw rod support portion 33 having a U-shaped cross section composed of an extended side surface 33 b, a screw rod 34 attached horizontally between the side surfaces 33 b of the screw rod support portion 33, and a portion screwed into the screw rod 34. A screw rod support portion 35 comprising a hook-shaped member 35a, a plate-like member 35b formed integrally with the other end of the member 35a in the vertical direction, and a side surface 35c extending horizontally from both ends thereof, and the screw A screw rod 36 vertically attached between the side surfaces 35c of the rod support portion 35, an arm support member 37 screwed into the screw rod 36, one end fixed to this, and a roller 39 serving as a film crimping means at the other end. Can be rotated freely Consisting digit substantially U-shaped roller arms 38..

  The roller 39 has a cylindrical shape, and the length of the cylinder is the curvature of the tire molded body T so that the film can be pressed on the side surface of the cylinder when the roller 39 is pressed against the inner surface of the tire molded body T. Decide together. The roller arm 38 is flexible so that the roller 39 moves smoothly along the inner surface of the tire.

A servo motor M, which is a drive mechanism, is connected to one end of the screw rods 34 and 36, and the screw rods that are screwed into these by driving the servo motor M to rotate the screw rods 34 and 36 forward and backward. The support part 35 is moved in the horizontal direction, and the arm support member 37 is moved in the vertical direction. Thereby, the roller 39 inserted into the center hole of the tire molded body T can be moved along the width direction of the inner surface thereof, and the film 42 a can be pressure bonded to the inner surface of the tire molded body T.
The film pressing device 30 is configured to move the roller 39 in the width direction of the tire molded body T. However, the present invention is not limited to this. For example, the rotation axis direction of the roller 39 coincides with the axial direction of the tire molded body T. Thus, the roller 39 may be held so as to move the roller 39 along the circumferential direction of the tire molded body T.

The driving of the motor is controlled by a control unit (not shown) of the film inner liner sticking device.
Further, instead of the roller 39, for example, a bladder or the like that can press-bond the film 42a to the inner surface of the tire molded body T may be used. In the present embodiment, the roller 39 is moved along the inner surface of the tire molded body T by rotating the screw rods 34 and 36 with a servo motor. However, the roller 39 is driven by another drive mechanism such as a cylinder mechanism. May be driven. If the roller 39 and the roller arm 38 are connected via a spring, the pressing force transmitted from the roller arm 38 to the roller 39 can be adjusted to be constant.

FIG. 6 is an enlarged cross-sectional view of the film 42a attached to the inner surface of the tire molded body T. FIG.
As shown in the drawing, the film 42a attached to the inner surface of the tire molded body T is attached so that the end portions in the width direction overlap each other, that is, a joint portion is formed in the width direction. The joint amount (width of the joint portion) may not be constant. For example, the joint amount may be different between the tire center portion and the vicinity of the bead portion.
Further, the film 42a attached by the film sticking device 20 is pressed by the film pressing device 30 already described, and the film 42a is also pressure-bonded to the inner surface of the tire molded body by the vulcanization bladder at the time of vulcanization. Thus, there is no problem in the quality of the product tire even if some wrinkles occur in the film 42a when it is attached to the tire molded body T.

As described above, the inner liners of tires of various sizes can be formed by spirally pasting the entire inner surface of the tire molded body T while overlapping the edges of the belt-like film 42a in the circumferential direction. The stock space of the film member can be reduced, and material management can be easily performed.
Moreover, in this embodiment, since it can affix on the inner surface of the tire molded object T, without cutting | disconnecting the film 42a, the tact time by cut | disconnecting can be reduced and productivity can be improved.
Compared with the conventional method of manufacturing an unvulcanized tire by attaching a film inner liner to the inner surface of a tire molded body, a high-quality tire without air remaining can be manufactured.

Since the film inner liner is affixed to the inner surface of the tire molded body and the film inner liner is not inflated, the influence of the rigidity of the joint portion due to inflation during molding can be eliminated.
In addition, since a thermoplastic resin film that is lighter than the rubber material is used for the inner liner, the tire weight is reduced compared to the case where a rubber material is used for the inner liner, which in turn improves the fuel economy of the automobile. In addition to the above advantages, there is little air leakage and a long life is possible. In addition, resources used can be saved, and productivity can be expected to improve, such as shortening the vulcanization time.

In addition, although it is somewhat disadvantageous in terms of tact time, when the film sticking device 20 includes a cutter, for example, the film 42a to be stuck on the inner surface of the tire molded body T is cut every time the tire is stuck and spiraled. It is also possible to attach a plurality of strip-like films 42a side by side in the width direction.
In the present embodiment, the adhesive has been applied to one surface of the film 42a. However, since the film 42a itself has adsorptivity, the adhesive need not necessarily be applied.
Moreover, the said film 42a stuck on the inner surface of the tire molded object T which concerns on this embodiment can also be used together with a rubber-made inner liner.

It is a front view which shows the tire molded object holder and film sticking apparatus which comprise a film inner liner sticking apparatus. It is an expansion perspective view which shows a film sticking apparatus and a film supply apparatus. It is an enlarged view of a sticking part. It is a figure explaining the procedure which affixes a film on the tire molding inner surface with a film sticking apparatus. It is a side view of a film pressing apparatus. It is an expanded sectional view of the film affixed on the inner surface of the tire molding. It is sectional drawing which shows the structure of the conventional pneumatic tire. It is a figure which shows the state which affixed the film-like sheet | seat on the tire molding drum in order to shape | mold the conventional inner liner, FIG. 8A is a perspective view of the tire molding drum which affixed the film-like sheet, FIG. 8B is the side view. is there.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Film inner liner sticking apparatus, 10 ... Tire molded object holder, 11 ... Press part, 11a ... Contact part, 20 ... Film sticking apparatus, 21 ... Groove, 22. ..Carriage, 23 ... slide plate, 24, 32 ... support, 25 ... drive device, 26 ... arm, 27 ... rotating shaft, 28 ... support plate, 28a ... Vertical plate, 28b ... Horizontal plate, 29 ... Cylindrical member, 30 ... Film pressing device, 31 ... Base, 33, 35 ... Screw rod support part, 33a, 35b ... Plate , 33b, 35c ... side face, 35a ... hook-shaped member, 34, 37 ... screw rod, 38 ... roller arm, 39 ... roller, 40 ... film supply device, 41 ... winding axis, 42 ... film roll, 42a ... film, 50 ... Attaching part, 51 ... box, 51a, 51b ... box, 51c ... outlet, 52 ... roller, 53 ... pressure roller, 54 ... pressure roller support rod, 54a ···················································· 54b ··· Support rod · 54c ··· Rocking rod · ··· 72 ··· Bead wire · ·············································· ..Sidewall rubber, 77... Inner liner, 82 a... Tip portion, 82 b.

Claims (9)

An apparatus for producing an unvulcanized tire comprising a film layer made of a belt-like film on the inner surface of a tire molded body,
A rotating means for rotating the tire molded body in the tire circumferential direction;
Film supply means for supplying a belt-like film to the inner surface of the tire molded body;
An apparatus for producing an unvulcanized tire, comprising: a film sticking means for sticking a belt-like film so that edges in the width direction thereof are overlapped along an inner peripheral surface of the rotating molded tire. In the manufacturing apparatus of the unvulcanized tire according to claim 1,
An apparatus for producing an unvulcanized tire, comprising film crimping means for crimping a film attached to an inner surface of the tire molded body. In the unvulcanized tire manufacturing apparatus according to claim 1 or 2,
The said film sticking means sticks the said strip | belt-shaped film on the tire molding inner surface helically, The manufacturing apparatus of the unvulcanized tire characterized by the above-mentioned. In the unvulcanized tire manufacturing apparatus according to any one of claims 1 to 3,
The film pasting means includes position changing means for changing a position in the tire width direction to which the belt-like film is stuck, and angle changing means for changing an angle for sticking the belt-like film. Tire manufacturing equipment. In the unvulcanized tire manufacturing apparatus according to claim 4,
The said angle change means has a rotational movement means to rotate and move the strip | belt-shaped film supplied from the said film supply means along a circular arc, The manufacturing apparatus of the unvulcanized tire characterized by the above-mentioned. A method for producing an unvulcanized tire comprising a film layer made of a belt-like film on the inner surface of a tire molded body,
Supplying the belt-like film to the inner surface of the molded tire,
A step of rotating the tire molded body;
A method of manufacturing an unvulcanized tire, comprising: a step of attaching a belt-like film so that edges in the width direction are overlapped along an inner peripheral surface of a rotating molded tire. In the manufacturing method of the unvulcanized tire described in Claim 6,
The manufacturing method of the unvulcanized tire characterized by including the process of crimping | bonding the said affixed film to the said tire molded object whole surface. In the method for producing an unvulcanized tire according to claim 6 or 7,
The method for producing an unvulcanized tire, wherein the step of superposing and pasting the strip-shaped film is spirally pasted on the inner surface of the tire molded body. In the method for producing an unvulcanized tire according to any one of claims 6 to 8,
The method for producing an unvulcanized tire, wherein the step of applying the overlapped layers is performed by changing the angle of the belt-like film surface corresponding to the inner peripheral attaching surface of the molded tire.

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