JP2006007703A - Method for coating cord with rubber and rubber coating apparatus using the method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make the thickness of a coating rubber in relation to a cord always constant and to enable a simple, prompt correspondence to the interruption, resumption, etc., of rubber coating work. <P>SOLUTION: When a rubber-coated cord produced by coating the cord with the rubber is supplied directly to each of migration molding drums positioning-stopped in an operating station, a cold rubber sheet 7 is supplied to each of the upper surface side and lower surface side of the cords 1 arranged in parallel in the operating station, and the cold rubber sheets 7 are adhered to the cords by a press roll 4 to constitute the rubber-coated cords 8. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  According to the present invention, a plurality of fixed work stations arranged at predetermined positions are assembled with a required tire constituent member on a molding drum that can be a rigid core that is moved to the work stations as required. At the time of molding a raw tire, a rubber-coated cord as a tire constituent member is formed at a predetermined work station for the purpose of forming a cord reinforcing layer such as a carcass ply and a belt layer on the molding drum. TECHNICAL FIELD The present invention relates to a rubber coating method for a cord and a rubber coating apparatus used therefor, and in particular, improves the quality of a rubber-coated cord and easily copes with temporary stoppage of the movement of a molding drum. It proposes a technology that can be used.

  A technique for molding a raw tire by moving a molding drum to each fixed work station, for example, in a predetermined or required order, and assembling a predetermined tire constituent member on the molding drum in a predetermined order. Various types have been proposed in the past, and the applicant has previously proposed a tire molding system of this type as Japanese Patent Application No. 2002-341275.

  This tire molding system is configured such that a carriage b supporting a molding drum a is moved on a rail c laid on a floor surface or the like, as partially illustrated in FIG. An endless rail c having an approximately oval shape including an arcuate curved portion on the premise that tire components are sequentially assembled at respective work stations d, e, f, and g arranged along In the above, the purpose is to position the molding drum a at each work station d, e, f, and g with high accuracy, and the carriage guide means includes two inner and outer laid parallel to each other. Wheels that are provided on the endless rail c and the molded carriage b and that roll on at least both sides of each endless rail with rollers or balls to regulate the carriage position in a direction perpendicular to the extending direction of the endless rail c. Each endless rail c is composed of at least one linear portion and one arc-shaped portion so that both the portions are smoothly continuous, and the rail width of the arc-shaped portion is the arc shape. The width is narrower than the rail width of the straight portion by an amount corresponding to the radius of curvature of the portion.

In such a tire molding system, each of a plurality of molding carts b on the endless rail c is moved to a plurality of work stations d, e, f, g, and each of these work stations d, e, f, In g, by performing different operations on the respective molding drums a at the same time, the raw tire as expected can be molded with high efficiency under a simple mechanism.
Japanese Patent Application No. 2002-341275

  By the way, in this proposed technique, a work station for forming a carcass ply, a belt layer, and other cord reinforcing layers on the molding drum a, for example, work stations d and g, is configured to form a rubber-coated cord as a tire constituent member. In FIG. 6, an attempt is made to arrange a so-called insulation device, as illustrated by a schematic cross-sectional perspective view in FIG. 6, in which each of a plurality of cords i fed out from a bobbin h is replaced with insulation. Under the action of the insert k incorporated in the die j, the molten rubber m is run while being aligned in a parallel posture with a predetermined pitch, and is kneaded and melted by the extruder l and pressurized and fed to the insulation die j. j, a rubber-coated cord n is formed by bringing a plurality of cords i into close contact with both upper and lower sides. It is set to.

  The rubber-coated cord n constructed as described above is supplied in a directly connected state to the molding drum a positioned and stopped at the work stations d and g, and is normally corded on the molding drum that is rotationally displaced. It serves for the formation of a reinforcing layer.

  However, when the rubber-coated cord i is configured by such an insulation device, for example, the cord traveling speed is increased at the beginning of the formation of the cord reinforcing layer, and the cord traveling speed is decreased immediately before the cord reinforcing layer is formed. In addition to the problem that the thickness of the rubber covered by the cord i changes due to the fluctuation of the traveling speed of the cord i, the molding drum a is moved by trouble such as an unexpected stop of the movement of the molding drum a. However, when the work stations d and g cannot be reached at a predetermined timing, or when it is necessary to change at least one of the rubber material and the cord material, the insulation device must be stopped. Is an early vulcanization to the molten rubber m that will remain in the extruder l and the insulation head j, There is a problem in the work process and man-hour that it is necessary to take out the rubber m from the apparatus in order to prevent the occurrence of burrs, etc. On the other hand, when the operation of the apparatus is resumed, There was a problem that it took time to prepare the molten rubber for starting the rubber coating.

  The object of the present invention is to solve the problems caused by the construction of a rubber-coated cord with an insulation device of such a proposed technique. Regardless of the running speed of the cord, which can be a fiber cord or the like, the thickness of the rubber coated thereon can always be as expected on either the upper or lower side of the cord, In addition, the rubber coating of the cord is temporarily interrupted due to the failure of the molding drum itself, failure to assemble the tire components, etc. And even if it is resumed later, the work process and man-hours for taking out the molten rubber and newly preparing the molten rubber, etc. And it is possible to eliminate the time, to provide a rubber coating apparatus using a rubber coating method and that of the code.

  In the rubber coating method of the cord of the present invention, the cord is covered with a rubber coating on each of the movable molding drums that are positioned and stopped at the work station, for example, moved on a track traveling path or a trackless traveling path by a carriage. In supplying the rubber-coated cord in a directly connected state and forming the cord reinforcing layer therein, on the work station, on each of the upper surface side and the lower surface side of the plurality of cords arranged in a parallel posture, for example, A cold rubber sheet prepared by winding on a reel in advance is fed, and the rubber sheet is brought into close contact with a cord by a pressure-bonding roll to constitute a rubber-coated cord in which they are integrated.

  The cord rubber coating apparatus of the present invention used for carrying out this method is particularly provided with a plurality of cord aligning means, and each of the aligned upper and lower surfaces of the cords. A pair of sheet winding reels for feeding a cold rubber sheet to each other, and a pair of pressure-bonding rolls for bringing these both rubber sheets into close contact with the aligning cord are provided on the aligning means and the sheet winding reel. The cords are provided on the front side in the traveling direction of the cord, that is, on the downstream side.

  In such a rubber coating apparatus, preferably, a pair of winding reels that are fed from the sheet winding reel together with the cold rubber sheet and are peeled off from the cold rubber sheet and rolled up can be a plastic film, a sheet, etc. It is provided on the front side or the rear side in the running direction of the cord with respect to the pressure roll.

  In the method of the present invention, under the so-called cold calendar method, each cold rubber sheet that has been pre-formed is fed to the upper and lower surfaces of the cord aligned in a parallel posture with a predetermined pitch, and the rubber-coated cord is By configuring the cord and the rubber sheet, the cord and the rubber sheet are fed and run at an equal speed. Therefore, even if the supply speed of the rubber-coated cord to the molding drum is slow, the coated rubber thickness of the cord is The cold rubber sheet to be fed is always kept constant, thereby effectively preventing unexpected fluctuations in the coating rubber thickness.

  Also, here, it is possible to cope with troubles occurring on the molding drum side, interruption of the configuration of the rubber-coated cord caused by material switching, etc., and suspension by stopping the feeding of the cord and the cold rubber sheet. In addition, since the resumption of the formation of the rubber-coated cord can be dealt with immediately and immediately by resuming the running, the rubber once kneaded and melted is removed from the insulation device and worked. When restarting, it is possible to dispense with work such as kneading and melting of rubber in the insulation apparatus.

  In the apparatus of the present invention, the cords from the sheet winding reel are arranged in a state where the plural cords fed from the bobbin or the like are aligned in the vertical and horizontal directions by the aligning means to be in a parallel posture with a predetermined pitch. Each cold rubber sheet fed out at an equal speed is fed to the upper and lower surfaces of the cords, and then passed between a pair of crimping rolls so that the cold rubber sheets are integrally adhered to the cords. Thus, it is possible to easily and efficiently form a rubber-coated cord as expected.

  The rubber-coated cord formed in this way can be supplied to each of the movable molding drums in a directly connected state and used for forming a cord reinforcing layer.

  By the way, in this apparatus, when the reel for winding the release liner wound on the rubber sheet is provided in order to prevent blocking of the cold rubber sheet wound around the reel, the release liner becomes unnecessary. Can be easily handled by the reel, and the reuse of the release liner can be facilitated.

  FIG. 1 is a schematic side view showing an embodiment of an apparatus according to the present invention. In the figure, 1 shows a cord that can be a steel cord, an organic fiber cord, etc., fed from a bobbin (not shown), Reference numeral 2 denotes an aligning means that aligns a plurality of cords 1 that are fed out simultaneously and aligns them at a predetermined pitch.

Here, with respect to the aligning means 2, a sheet winding reel 3 that is paired up and down across the cord 1 on the rear side in the feeding traveling direction of the cord 1 and feeds the wound cold rubber sheet is provided. Further, a crimping roll 4 that is paired up and down across the cord 1 is supported by a frame 5 on the front side in the feeding traveling direction of the cord 1 and is spring-supported in a direction close to each other. Energize and arrange.
Here, of course, the roll gap between the two crimping rolls can be adjusted as required.

  Further, in the figure, a pair of pressure-bonding rolls 4 is provided with a winding reel 6 of a release liner, which is also paired up and down, on the front side of the cord 1 in the running direction. Each of the take-up reel 6 and the pressure-bonding roll 4 is drivingly connected to a rotation driving means (not shown), for example, a motor, which is common to each other or separate from each other.

  Here, the aligning means 2 is constituted by, for example, a comb-tooth-shaped member, a comb roll, a press roll, or a perforated member in which a plurality of through-holes allowing passage of unit codes are formed at a predetermined pitch. In addition, the sheet winding reel 3 is made of, for example, a molded cold rubber sheet that has a width of 40 to 80 mm and a thickness that includes a release liner of 1.1 to 1.5 mm. It can have a dimension capable of winding about 100 to 300 m by winding, spiral winding or the like.

  In forming the rubber-coated cord by the apparatus configured as described above, each of the sheet windings is applied to a plurality of cords 1 fed from the bobbin and aligned at a predetermined pitch by the aligning means 2. A cold rubber sheet 7 with a release liner fed from the reel 3 is fed to both the upper and lower sides of the cord 1 at a speed equal to the traveling speed of the cord 1, and the rubber sheet 7 together with the cord 1 is paired with a pair of crimps. Pass between rolls 4.

  Thereby, both the crimping | compression-bonding rolls 4 rotationally driven by the cord 1 and the rubber sheet 7 at a constant speed, as illustrated in an enlarged perspective view in FIG. The cold rubber sheet 7 is pressed against the cord 1 with a large force, thereby forming a rubber-coated cord 8 in which both the cold rubber sheets 7 are sufficiently adhered to the cord 1 without a gap.

In this case, the release liner 9 laminated on the contact surface side of each cold rubber sheet 7 with the pressure-bonding roll 4 is slightly faster than the traveling speed of the cord 1 (10 to 10) after it passes through the pressure-bonding roll 4. Each winding reel 6 that is rotationally driven at about 15%) is peeled off from the surface of the cold rubber sheet 7 and thus from the surface of the formed rubber-coated cord 8 and wound there.
On the other hand, the formed rubber-coated cord 8 is supplied in a directly connected state onto a molding drum positioned and stopped at the work station, and forms a required cord reinforcing layer such as a carcass ply and a belt layer there. .

  By the way, when the rubber-coated cord 8 is formed in this way, the cold rubber sheet 7 is fed at a speed equal to the traveling speed of the cord 1, so that the use speed of the rubber-coated cord 8 is slowed down. However, the thickness of the covering rubber is always kept constant.

And here, the stop of the supply of the rubber-coated cord 8 to the molding drum can be easily dealt with by the rotation of the pressure-bonding roll 4 and the stop of the running of the cord 1 and the rubber sheet 7. Even if the stop time becomes long, no special physical property change or the like occurs in the cold rubber sheet 7, so that the supply of the covering cord 8 can be resumed in the above stop state or in a pair of crimping rolls. It is possible to wait under 4 mutual displacements.
Therefore, the resumption of the supply of the rubber-coated cord 8 can be easily dealt with by restarting the stopped operation with or without the proximity displacement of the pressure-bonding roll 4, and from the beginning of the resumption of the operation. A sufficiently uniform coating cord 8 can be formed.

  When the rubber-coated cord 8 is formed as described above, the manner in which the cold rubber sheet 7 passes through the pressure-bonding roll 4 can be selected as necessary. For example, the sheet winding reels that form a pair vertically Two pairs of 3 can be provided, and two cold rubber sheets 7 can be fed to each of the upper surface side and the lower surface side of the cord 1.

  In this case, the side edge positions of the two rubber sheets 7 fed to the upper surface side of the cord 1 and the same side edge of the two rubber sheets 7 fed to the lower surface side of the cord 1 are arranged. When the position is the central portion in the alignment width direction of the cord 1, as shown schematically in FIG. 3 (a), the left and right side edges of the pair of rubber sheets 7 on the upper surface side and the lower surface side While the positions s can be aligned together, when the contact side edge positions t of the two rubber sheets 7 are offset from each other in the alignment width direction of the cord 1, as shown in FIG. The left and right side edge positions s of the set of two rubber sheets 7 can be shifted in the alignment width direction of the cord 1 by an amount corresponding to the offset amount between the upper surface side and the lower surface side of the cord 1, and this latter In this case, when the rubber-coated cord 8 is wound and laminated on the molding drum, the lamination step There is an advantage that can be a small.

  Incidentally, the take-up reel 6 of the release liner 9 can also be disposed on the rear side in the traveling direction of the cord 1 with respect to the pressure-bonding roll 4 as illustrated in FIG. Only the cold rubber sheet 7 after being peeled is supplied between the crimping rolls together with the cord 1.

It is a rough-line side view which shows embodiment of the apparatus which concerns on this invention. It is an expansion partial perspective view which shows the effect | action of the apparatus shown in FIG. It is sectional drawing which shows typically the supply aspect of a cold rubber sheet. It is an approximate line side view showing other examples of arrangement of a winding reel. It is an approximate line top view which illustrates a part of tire molding system. It is a rough-line perspective view which shows a part of insulation apparatus as a cross section.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Code 2 Alignment means 3 Sheet winding reel 4 Crimp roll 5 Frame 6 Winding reel 7 Cold rubber sheet 8 Rubber covering cord 9 Release liner t Contact side edge position s Left and right side edge positions

Claims (3)

In supplying a rubber-coated cord, which is formed by applying a rubber coating to the cord, to each of the movable molding drums whose positioning is stopped at the work station,
At the work station, a cold rubber sheet is fed to each of an upper surface side and a lower surface side of a plurality of cords arranged in a parallel posture, and the cold rubber sheets are brought into close contact with the cord by a crimping roll, and the rubber-coated cord A method of covering a cord with rubber. It is an apparatus used for implementation of the rubber coating method of the cord according to claim 1,
A plurality of cord aligning means are provided, and each sheet winding reel for feeding a cold rubber sheet to each of the upper surface side and the lower surface side of the aligned cords is provided. A cord rubber coating apparatus provided with a pair of pressure-bonding rolls to be brought into close contact with the alignment cord.   A pair of winding reels for separating and peeling the release liner fed from the sheet winding reel together with the cold rubber sheet from the cold rubber sheet is provided on the front side or the rear side in the running direction of the cord with respect to the pressure-bonding roll. Item 3. A rubber coating apparatus according to Item 2.

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