JP2005074870A - Tire shaping drum unit and tire shaping method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tire shaping drum unit which decreases a running cost by reducing consumables, is of a simple construction and is inexpensive, and to provide a tire shaping method. <P>SOLUTION: The tire shaping drum unit is equipped with a pair of drums 3 separably mounted on a main axis 1, a turn-up bladder 29 attached on the side of the facing surface 19 and on the outer circumference of each drum 3 to lift a sidewall 8 placed on the outer circumference to a plastering position, and a pushing-up plate 31 mounted on the inner circumference side of the turn-up bladder 29 so that it can be raised or fallen to push the sidewall 8 to the plastering position by pushing up the turn-up bladder 29. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a tire molding drum device and a tire molding method for molding a tire.

  In a general tire forming drum device, a pair of beads are set on a carcass wound around a drum and formed into a cylindrical shape, and the side wall of the outer portion of the carcass bead is expanded to wrap the beads. A turn-up operation is performed to turn back on. When performing this turn-up operation, it is mainstream to use a turn-up bladder. This turn-up bladder can be roughly divided into the following two types.

One of them is called a dual bladder turn-up system, and for example, there is one disclosed in JP-A-2002-52623.
JP 2002-52623 A (page 3 and FIGS. 1 and 2)

FIG. 5 shows a partial configuration of the tire forming drum device described in this publication. FIG. 5 shows a quarter portion of the cross section of the tire molding drum device. A drum 102 is slidably attached to the tire forming drum device along the main shaft 101. The drum 102 is provided with bead gripping means 103 that moves in the outer circumferential direction by a link mechanism. An annular turn-up bladder 104 and a push-over bladder 105 are detachably attached to the outer peripheral surface of the drum 102. The turn-up bladder 104 and the push-over bladder 105 are inflated as shown in FIG. 5 by introducing air, but the push-over bladder 105 is positioned inside the turn-up bladder 104 in the non-actuated state when it is not inflated. Collapsed.
A bead 107 is set on the carcass 106 wound around the drum 102 in a cylindrical shape, the bead gripping means 103 is moved in the outer peripheral direction to grip the bead 107, and then the central carcass 106 is expanded outward. Next, the turn-up bladder 104 is inflated to lift the sidewall 108 (the portion outside the bead 107 of the carcass 106) while expanding the diameter, and then the push-over bladder 105 is inflated. With this expanded pushover bladder 105, the turn-up bladder 104 is pushed up from behind, and the sidewall 108 is pressed and bonded to the expanded carcass 106 in a state of wrapping the bead 107.

Another method is called a push-can method, which is disclosed in, for example, Japanese Patent Application Laid-Open No. 2002-81404.
JP 2002-81404 A (page 3 and FIG. 3)

  FIG. 6 shows a partial configuration of the tire forming drum device described in this publication. FIG. 6 shows a quarter portion of the cross section of the tire molding drum device. In this configuration, a disk-shaped push can 109 provided so as to be movable in the axial direction of the main shaft 101 is moved by an air cylinder 110 to serve as the push over bladder 105 (see FIG. 5). That is, a bead 107 is set on the carcass 106 wound in a cylindrical shape on the drum 102, the bead gripping means 103 is moved in the outer peripheral direction to grip the bead 107, and then the central carcass 106 is directed outward. Inflate. Next, the turn-up bladder 104 is inflated and lifted while expanding the diameter of the side wall 108 (the portion outside the bead 107 of the carcass 106), and then the push can 109 is moved in the direction of the carcass 106 (arrow direction in FIG. 6). By this push can 109, the turn-up bladder 104 is pushed from behind, and the sidewall 108 is pressed and bonded to the carcass 106 expanded in a state of wrapping the bead 107.

By the way, since the conventional dual bladder turn-up type tire forming drum apparatus as described above uses the push-over bladder 105 to press the turn-up bladder 104, the number of bladders that are consumables increases. . In addition, it is difficult to replace each bladder, and man-hours for replacement may be required, resulting in an increase in operating costs.
Further, when the push-over bladder 105 is inflated and the sidewall 108 lifted by the turn-up bladder 104 is pressed against the carcass 106, the operation is controlled only by the pressure balance between the turn-up bladder 104 and the push-over bladder 105. Initially, the reaction force from the turn-up bladder 104 is large, and only the push-over bladder 105 swells outward, and does not readily press the sidewall 108. For this reason, it is necessary to finely adjust the pressures of the turn-up bladder 104 and the push-over bladder 105 such that the pressure of the turn-up bladder 104 is lowered in the middle, and there is a problem that control is difficult.
In addition, the reaction force of the side wall 108 is also added, and the side wall 108 hardly sticks up, and the side wall 108 is attached to the carcass in such a manner that air is entrained therein. For this reason, after attaching the sidewall 108, there is a problem that an additional work of extracting air is required.

The above-mentioned push can method solves the problems of the above-described dual bladder turn-up method. However, since the push can 109 and the air cylinder 110 are provided outside the drum, the tire forming drum device is complicated and large. There is a problem that the device price increases.
Further, when the completed tire is taken out from the drum device, and when the carcass and beads are carried into the drum device, the push can 109 becomes an obstacle. There is a problem that the installation space of the tire forming drum device becomes large.
Further, since the turn-up bladder 104 tends to protrude outward from the inner peripheral side that is not pressed by the push can 109, there is a problem that the turn-up bladder 104 is rubbed with the push can 109 and easily damaged.

  In view of the above problems, an object of the present invention is to provide a tire forming drum device and a tire forming method that reduce the operating cost by reducing the number of consumables and that have a simple equipment configuration and a low device price.

In order to solve the above problems, the absorption refrigerator of the present invention employs the following means.
That is, in order to solve the above-described problems according to the present invention, the present invention employs the following means. In the tire forming drum device of the present invention, a pair of drums provided on the main shaft so as to be separated from each other, and a side wall mounted on the outer peripheral surface of the drum, which is attached to the outer surface on the opposite surface side of the drum. A turn-up bladder that lifts to a sticking position, and a push-up member that is provided on the inner peripheral side of the turn-up bladder so as to be able to rise and fall, and pushes up the turn-up bladder to push the sidewall to the sticking position. It is characterized by having.

  As described above, the push-up member is provided on the inner peripheral side of the turn-up bladder so that the push-up member can be moved up and down, so that the push-up member enters the inner peripheral side of the turn-up bladder when the drum is closed. Therefore, since the space can be saved by the amount that the push-up member has entered the inner peripheral side of the turn-up bladder, the entire apparatus can be made compact. In addition, since the consumables are only turn-up bladders, the consumables can be halved compared to the dual bladder turn-up method.

  In the tire molding drum device according to the present invention, a fulcrum for raising and lowering the push-up member is provided in the vicinity of an attachment portion of the turn-up bladder with respect to the drum.

  In this way, since the fulcrum for raising and lowering the push-up member is provided in the vicinity of the mounting portion of the turn-up bladder with respect to the drum, when the push-up member is raised, the turn-up bladder comes into contact with the root side. Become. Therefore, since the turn-up bladder presses the side wall from the base (inner circumference) side to the application position, air does not remain in the application part and can be applied well.

  In the tire molding drum device according to the present invention, a polytetrafluoroethylene-based coating is applied to the outer surface of the push-up member.

  Thus, since the polytetrafluoroethylene-based coating is applied to the outer surface of the push-up member, it becomes easy to slip between the push-up member and the turn-up bladder. For this reason, since the movement of the turn-up bladder is smooth, the side walls are smoothly pasted.

  Further, in the tire molding method of the present invention, the lifting step of inflating the turn-up bladder to lift the sidewalls placed on the outer peripheral surface of the turn-up bladder to the application position; And a sticking step of sticking the side wall by raising a push-up member provided on the peripheral side so as to be able to be tilted and pressing the turn-up bladder to a sticking position.

  In this way, the turn-up bladder was inflated, and the sidewall placed on the outer peripheral surface of the turn-up bladder was lifted to the application position, and then provided on the inner peripheral side of the turn-up bladder so that it could be tilted. Since the push-up member is raised and the turn-up bladder is pushed to the sticking position and the sidewall is stuck, the number of consumables can be reduced and the device configuration can be made compact, and therefore inexpensive. Tires can be manufactured.

According to the first aspect of the present invention, since the push-up member is provided on the inner peripheral side of the turn-up bladder so that it can be raised and lowered, the entire apparatus can be made compact. In addition, since the consumables are only turn-up bladders, the consumables can be halved compared to the dual bladder turn-up method.

  According to the second aspect of the present invention, in addition to the effect of the first aspect of the present invention, the raising / lowering fulcrum of the push-up member is provided in the vicinity of the mounting portion of the turn-up bladder with respect to the drum. , Air does not remain in the affixed portion, and good affixing can be performed.

  According to the invention of claim 3, in addition to the effect of the invention of claim 2, the outer surface of the push-up member is provided with a polytetrafluoroethylene-based coating. The side wall can be applied smoothly.

  According to the invention described in claim 4, after the turn-up bladder is inflated to lift the sidewall placed on the outer peripheral surface of the turn-up bladder to the application position, the turn-up bladder is moved to the inner peripheral side of the turn-up bladder. Since the push-up member provided so that it can be raised and raised is raised, the turn-up bladder is pushed to the affixing position, and the side wall is affixed, the number of consumables is reduced and the apparatus has a compact structure. Therefore, the tire can be manufactured at a low cost.

Embodiments according to the present invention will be described below with reference to the drawings.
[First embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 shows a cross-sectional view of a tire forming drum device according to the present embodiment. In the figure, the upper side of the center line XX shows a state where a sidewall is attached, and the lower side of the center line XX shows a state where the drum is closed. FIG. 2 is a partial cross-sectional view showing the right half of FIG. 1 and shows a state in which the drum is closed. FIG. 3 is a partial cross-sectional view showing the right half of FIG. 1 and shows a state where a sidewall is attached. FIG. 4 is a view from A in FIG.

The tire molding drum device includes a hollow main shaft 1, a pair of drums 3 and 3 that are movably mounted in an axial direction so as to surround the outer periphery of the main shaft 1, and the main shaft 1 at an intermediate position between the pair of drums 3. The carcass mounting portion 5 attached to the main structure is the main configuration.
A screw shaft 7 having the same axis as that of the main shaft 1 is rotatably mounted inside the main shaft 1. Two screw portions 9 are provided on the screw shaft 7 at a position equidistant from the carcass placement portion 5. A nut 11 is screwed into each screw portion 9.
The drum 3 has a cylindrical sleeve 13 on the inner peripheral side, and the sleeve 13 is slidably attached to the main shaft 1. The sleeve 13 is connected to the nut 11 by a connecting member 15 at two places in the circumferential direction. The connecting member 15 moves in a notch 17 formed on the outer periphery of the main shaft 1.
A facing surface 19 is attached to the end surface of the sleeve 13 which is the surface on which each drum 3 faces. A plurality of bead gripping members 21 are attached to the facing surfaces 19 of the sleeve 13 so as to be slidable in the radial direction. The bead gripping member 21 is connected to the piston 25 of the air cylinder 23 by a link 27, and slides in the outer circumferential direction by the advancement and retraction of the piston 25 with respect to the sleeve 13.

  A ring-shaped attachment member 28 is detachably provided on the opposing surface 19 of the sleeve 13 by a bolt at the outer peripheral end portion thereof. Further, a ring-shaped attachment member 30 is detachably provided by a bolt at a position opposite to the sleeve 13 where the bead gripping member 21 is inserted. Grooves are provided on the entire contact surfaces of the attachment members 28 and 30 with the sleeve 13. By attaching the mounting members 28 and 30 to the sleeve 13 with the protrusions provided at the end portions of the turn-up bladder 29, which is a rubber bag, being fitted in the grooves of the mounting members 28 and 30, respectively. The turn-up bladder 29 is attached so as to cover the bead gripping member 21.

As shown in FIG. 4, the push-up plate (push-up member) 31 is provided at twelve points at equal intervals in the circumferential direction, and each fulcrum is provided near the attachment portion of the turn-up bladder 29. It is attached so as to be rotatable about 33. The intermediate portion 32 of the push-up plate 31 and the piston 39 of the air cylinder 37 are connected by a link 35. The push-up plate 31 rotates, that is, rises and falls around the fulcrum 33 via the link 35 as the piston 39 advances and retreats with respect to the sleeve 13.
The push-up plate 31 is made of aluminum, and a polytetrafluoroethylene-based coating is applied to the surface in contact with the turn-up bladder 29.
In this embodiment, the material of the push-up plate 31 is aluminum. However, the material is not limited to this, and any metal material may be used, and plastic may be used as long as it has the necessary strength.
The sleeve 13 is provided with a bladder air pipe 41 for expanding the turn-up bladder 29. The sleeve 13 is provided with bead gripping air pipes 43 and 45 for moving the piston 25 forward and backward.
The piston 39 moves forward with respect to the sleeve 13 by supplying compressed air to the port 48 to raise the plate 31, and supplies vacuum to the port 48 when the plate 39 is moved backward.
A stopper 47 that restricts movement of the piston 39 toward the facing surface 19 is attached to the sleeve 13.

The tire molding drum device having the above configuration operates as follows.
With the tire forming drum device closed (the lower half of FIG. 1 and the state shown in FIG. 2), the carcass 4 is mounted on the drum 3 and the carcass mounting portion 5 on both sides in a cylindrical shape.
Next, the bead 6 is placed on the outer periphery of the carcass 4 and at a position facing the bead gripping member 21. In this state, compressed air is supplied from the bead gripping air pipe 43 to move the piston 25 of the air cylinder 23 toward the carcass mounting portion 5. Due to the movement of the piston 25, the bead gripping member 21 moves in the outer peripheral direction via the link 27 and firmly holds the bead 6 with the carcass 4 interposed therebetween.
In this state, the screw shaft 7 is rotated to move the sleeves 13 on both sides in the direction of the carcass placing portion 5, and compressed air is supplied from the carcass placing portion 5 through an air pipe (not shown) to The carcass 4 between 6 is inflated to form a tire.

Next, compressed air is supplied from the bladder air pipe 41 to inflate the turn-up bladder 29 and lift the side wall 8 (portion outside the bead 6 of the carcass 4) in the outer circumferential direction while increasing the diameter (lifting). Process).
In this state, compressed air is supplied from the port 48 to the air cylinder 37 to move the piston 39 toward the carcass placement portion 5. Due to the movement of the piston 39, the push-up plate 31 is raised to the outside around the fulcrum 33 via the link 35. As the push-up plate 31 rises outward, the push-up plate 31 sequentially contacts the expanded turn-up bladder 29 from its root side and pushes it in the direction of the carcass placement portion 5. Therefore, the sidewall 8 lifted by the turn-up bladder 29 is pressed and bonded to the carcass 4 inflated in the tire shape sequentially from the root side with the bead 6 interposed therebetween to form the tire side surface (sticking step).
In this embodiment, the portion outside the bead 6 of the carcass 4 is used as the sidewall 8, but side surface constituent materials other than the carcass 4 may be added depending on the tire.

According to the tire forming drum device of the present embodiment, the following operational effects are obtained.
Since the push-up plate 31 is provided on the inner peripheral side of the turn-up bladder 29 so that it can be tilted, the push-up plate 31 enters the inner peripheral side of the turn-up bladder 29 when the drum 3 is closed. Accordingly, since the space can be saved by the amount that the push-up plate 31 enters the inner peripheral side of the turn-up bladder 29, the entire apparatus can be made compact. Further, since the consumable item is only the turn-up bladder 29, the consumable item can be halved compared to the dual bladder turn-up method.

  Further, since the fulcrum 33 for raising and lowering the push-up plate 31 is provided in the vicinity of the attachment member 30 for the sleeve 13 of the turn-up bladder 29, when the push-up plate 31 is raised, Contact will be made from the root side. Therefore, the turn-up bladder 29 presses the sidewall 8 against the carcass 4 inflated into a tire shape from the root (inner circumference) side, so that air does not remain in the affixed portion and can be affixed satisfactorily.

  Further, since the polytetrafluoroethylene-based coating is applied to the outer surface of the push-up plate 31, the space between the push-up plate 31 and the turn-up bladder 29 is easy to slip. For this reason, since the movement of the turn-up bladder 29 becomes smooth, the side walls 8 are stuck smoothly.

It is sectional drawing of the tire shaping | molding drum apparatus which implemented this invention. It is a fragmentary sectional view which shows the state which closed the drum in the right half of FIG. It is a fragmentary sectional view which shows the state which affixed the side wall in the right half of FIG. It is A view of FIG. It is a fragmentary sectional view showing a conventional dual bladder turn-up type tire forming drum device. It is a fragmentary sectional view which shows the conventional push can type tire shaping | molding drum apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main axis | shaft 3 Drum 8 Side wall 19 Opposite surface 29 Turn-up bladder 31 Push-up plate (push-up member)
33 fulcrum

Claims (4)

A pair of drums provided on the main shaft so as to be separated from each other;
A turn-up bladder that is attached to the outer surface of the opposite surface of each drum and that lifts the side wall placed on the outer surface to the application position;
A push-up member provided on the inner peripheral side of the turn-up bladder so as to be able to rise and fall, and pushing up the turn-up bladder to push the sidewalls to the application position;
A tire forming drum device comprising: The tire forming drum device according to claim 1, wherein a fulcrum for raising and lowering the push-up member is provided in the vicinity of an attachment portion of the turn-up bladder with respect to the drum. The tire forming drum device according to claim 1 or 2, wherein a polytetrafluoroethylene-based coating is applied to an outer surface of the push-up member. A lifting step of inflating the turn-up bladder and lifting the sidewalls placed on the outer peripheral surface of the turn-up bladder to the application position;
An affixing step of affixing the side wall by raising a push-up member provided on the inner peripheral side of the turn-up bladder so as to be able to rise and fall, pressing the turn-up bladder to an affixing position,
A tire molding method comprising:

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