JP2006255934A - Manufacturing method of rubber-coated cord and pitch-variable fixture - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a rubber-coated cord improved in order to wind the rubber-coated cord around a winding target such as a taper cylindrical rubber or the like even if the winding target is large in size or relatively large in taper angle without causing an angular difference between the large diameter side and small diameter side of the winding target while dispensing with a preparation process for preforming a reinforcing cord into a fan shape, or the like. <P>SOLUTION: In the manufacturing method of the rubber-coated cord having a coating process for coating a plurality of the core materials 2, which are sent out of a core material supply part (a) in a parallelly arranged state, with the rubber 16 supplied from a rubber supply part (c) to form a wide belt-like unvulcanized cord body 17, A plurality of the core materials 2 sent out of the core material supply part (a) are coated with the rubber 16 while changing the arranging pitch P of the core materials 2 so as to allow the same to follow the sent-out quantity of the core materials 2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is a rubber having a coating step of forming a wide belt-shaped unvulcanized cord body by coating a plurality of core materials with rubber supplied from a rubber supply portion in a parallel arrangement state fed from a core material supply portion. The present invention relates to a coating cord manufacturing method and a pitch variable jig.

  The rubber-coated cord is a wide belt-like shape in which a plurality of core members are arranged in a row, that is, in a parallel state, and is covered with rubber, and as an example of usage, it is wound around a cylindrical taper rubber. There is a fiber reinforced rubber hose formed by vulcanization, and this fiber reinforced rubber hose is used for a rubber product or a high pressure hose requiring high pressure reinforcement such as a pumping tube of a squeeze pump. Incidentally, the pumping tube is required to have flexibility and strength that can withstand frequent deformation and high pressure resistance.

  In order to make the reinforcement characteristics uniform when a rubber-coated cord is wound around a winding object such as a cylindrical rubber, the winding angle (cord angle) of the core with respect to the surface of the winding object is constant. (Refer to α or β in FIG. 11). Conventionally, as a method for changing the core material pitch of this type of rubber-coated cord and a method for producing a fiber-reinforced rubber hose produced using the same, those disclosed in Patent Document 1 and Patent Document 2 are known. Yes.

  In Patent Document 1, when a steel cord having a certain width is wound around a truncated cone-shaped rubber hose, the large-diameter side is forcibly pulled out more by the inclination of a guide rail provided on the way to the rubber hose (the tension is increased). This is a method of canceling out the difference in winding length caused by the difference in diameter between the small diameter side and the large diameter side of the rubber hose. In other words, it is intended to remove the wrinkles due to the difference in winding speed between the large diameter side and the small diameter side in the cord width at the time of winding, but in order to obtain the effect, there are restrictions on the product length and taper angle, and rubber hose There is a problem that the wrapping angle on the surface cannot be prevented from gradually changing. Therefore, the means according to Patent Document 1 is limited in use to a comparatively short length or a small taper angle.

The one shown in Patent Document 2 is a flat frustum-shaped rubber hose, and a fan-shaped interdigital reinforcing cord (core material) prepared in advance is attached to the surface of the flat-developed rubber hose. And the rubber hose of the truncated cone shape reinforced by the fiber is produced by the method of rounding and forming in the shape of a taper hose. According to this means, the angle of the reinforcing fiber with respect to the rubber hose surface is maintained at a constant value. However, the reinforcing cord is cut in advance in a fan shape and requires a cumbersome and skillful preliminary process to wave the fiber. In addition, the productivity is not good unless a certain number is made. Therefore, it has been difficult to apply to a long shape, a large taper angle, a large diameter, and a small production quantity.
JP-A-11-58544 JP-A-8-159349

  In view of the above situation, the object of the present invention is to eliminate the need for a preparatory process such as creating a fan-shaped reinforcing cord in advance, while the size of a wound object such as a tapered cylindrical rubber is large or the taper angle is Providing an improved method of manufacturing a rubber-coated cord so that the rubber-coated cord can be wound without causing a difference in winding angle between the large-diameter side and the small-diameter side even if it is relatively large It is in. Another object of the present invention is to provide a pitch variable jig used in performing the manufacturing method.

  The invention according to claim 1 is a wide belt-shaped unvulcanized cord body in which a plurality of core materials 2 are covered with rubber 16 supplied from a rubber supply portion c in a parallel arrangement state fed from a core material supply portion a. In the method of manufacturing a rubber-coated cord having a coating step of creating 17, a rubber while changing the arrangement pitch P of the plurality of core materials 2 delivered from the core material supply section a depending on the delivery amount of the core material 2. 16 is covered.

According to a second aspect of the present invention, in the rubber-coated cord manufacturing method according to the first aspect, the long groove 6 or the long hole 6 through which the core material 2 is slidable is formed in parallel for the number of the core material 2. In addition, a pitch variable jig 3 is prepared in which the arrangement pitch P of the adjacent long grooves 6 or the long holes 6 is gradually changed in a synchronized manner in the longitudinal direction of the long grooves 6 or the long holes 6,
In a state where a plurality of core materials 2 fed from the core material supply part a are passed through the long grooves 6 or the long holes 6 of the pitch variable jig 3 adjacent to each other, the pitch variable jig 3 is inserted into the long grooves 6 or The arrangement pitch P of the core material 2 is changed depending on the feed amount of the core material 2 by moving in the longitudinal direction of the long holes 6.

  According to a third aspect of the present invention, in the rubber-coated cord manufacturing method according to the first or second aspect, the unvulcanized cord body 17 produced through the coating step is made of a cylindrical rubber 20 having a tapered portion. The fiber reinforcing layer 12 is formed on the outer periphery of the cylindrical rubber 20 by being spirally wound around the outer peripheral surface.

  The invention according to claim 4 is a wide belt-shaped unvulcanized cord body in which a plurality of core materials 2 are covered with rubber 16 supplied from a rubber supply portion c in a parallel arrangement state fed from the core material supply portion a. The pitch variable jig 3 used for changing the arrangement pitch P of the plurality of core materials 2 sent out from the core material supply section a depending on the feed amount of the core material 2 in the covering step for creating 17. The long groove 6 or the long hole 6 in which the core material 2 is slidably movable is formed in parallel to the number of the core material 2, and the arrangement pitch P of the adjacent long grooves 6 or the long holes 6 is determined by the long grooves. 6 or the long hole 6 is configured to be in a state of gradually changing in synchronism in the longitudinal direction.

  According to a fifth aspect of the present invention, in the pitch variable jig 3 according to the fourth aspect of the present invention, the long grooves 6 or 6 are arranged so that all the arrangement pitches P gradually change at the same value and at the same rate of change. A long hole 6 is formed.

  According to the first aspect of the present invention, the arrangement pitch is not changed by changing the arrangement pitch (core material density) by applying an excessive force after the core is coated with rubber, but the arrangement pitch is controlled to increase or decrease before the rubber is coated. Therefore, the shape accuracy and surface shape of the unvulcanized cord body are good, and the residual stress does not remain in the rubber, so that the inconvenience of the arrangement pitch P returning to the original state after being covered with the rubber can be avoided. Become so. Since the arrangement pitch of the core material is controlled to increase and decrease accurately and accurately, when winding an unvulcanized cord body around a winding object such as a tapered cylindrical rubber, between the end surfaces of adjacent unvulcanized cord bodies There is no gap or partial overlap, and the rubber joining accuracy is good. Moreover, such an advantage can be obtained regardless of the length. As a result, it is not necessary to prepare a fan-shaped reinforcing cord in advance. An improved method for producing a rubber-coated cord can be provided so that the rubber-coated cord can be wound without causing a difference in winding angle between the small-diameter side and the small-diameter side.

  According to invention of Claim 2, as a means to change the arrangement pitch of a core material, by moving the pitch variable jig | tool in which the long groove or long hole which guides these core materials corresponding to each core material was formed. Since it is what is performed, the arrangement pitch of all the core materials can be changed at a stroke only by moving the pitch variable jig. Accordingly, it is possible to provide a method for manufacturing a rubber-coated cord in which the arrangement pitch of the core material can be freely changed and set while the operation control is simple with relatively inexpensive equipment.

  According to the invention of claim 3, the arrangement pitch can be arbitrarily adjusted and set depending on the feed amount of the core material, so that the winding object has a cylindrical rubber having a tapered portion, that is, a truncated cone-like cylindrical shape. Even with rubber, there is no gap between the end faces of adjacent unvulcanized cord bodies, and there is no overlap, and it is possible to wind it with good rubber joining accuracy. Become. Thus, a rubber-coated cord that is suitable as a constituent member of a pumping tube or the like that requires the strength to withstand high pressure on the smaller diameter side by controlling the arrangement pitch of the core material to be narrower (the density becomes larger) on the smaller diameter side. Can be provided.

  The invention of claim 4 is a pitch variable jig as a specific configuration for the main part of the invention of claim 1, that is, “the arrangement pitch of a plurality of core members is changed depending on the feed amount of the core members”. Thus, it is possible to obtain an operational effect equivalent to the operational effect of the manufacturing method of claim 1.

  According to the invention of claim 5, the pitch variable jig used in the invention of claim 2 is specified and specified to some extent, and the same effect as that of the manufacturing method of claim 2 can be obtained. it can.

  Embodiments of a method for producing a rubber-coated cord according to the present invention and a pitch variable jig used therefor will be described below with reference to the drawings. 1 is a schematic overall system diagram showing a rubber-coated cord manufacturing apparatus, FIG. 2 is a front perspective view showing a pitch variable jig, FIG. 3 is an operation diagram showing a steel cord arrangement pitch variable situation, and FIGS. 6 and 7 are plan views showing unvulcanized cord bodies respectively produced by the production method according to the present invention, and FIGS. 8 and 9 are respectively a non-vulcanized cord body of FIGS. 10 is a plan view showing a state where the unvulcanized cord body of FIGS. 6 and 7 is wound around a tapered cylindrical rubber, FIG. 11 is an explanatory view of an incident angle, and FIG. It is a comparison table of various specifications between a comparative example and an example.

  Here, the rubber-coated cord 12 refers to a product obtained by vulcanizing the unvulcanized cord body 17 in a narrow sense, but a plurality of unvulcanized cord bodies 12 created through a coating process are stacked, Since the unvulcanized cord body 12 may be united in series, the unvulcanized cord body 17 itself as a product produced by the production apparatus A may be referred to as the rubber-coated cord 12 in a broad sense. Further, the unvulcanized cord body 17 in a state where the uncured cord body 17 is wound around the winding object 20 such as a tapered cylindrical rubber may be referred to as a rubber-coated cord (fiber reinforcing layer) 12.

  First, the rubber-coated cord manufacturing apparatus A will be described. As shown in FIG. 1, the rubber-coated cord manufacturing apparatus A includes a core material supply part a, a pitch variable part b, a rubber supply part c, a rubber coating part d, a transport driving part e, and the like. It is configured. The core material supply unit a includes a grooved roller 1 having a plurality of circumferential grooves (reference numerals omitted) formed on the outer periphery to guide and guide the steel cord 2 and a steel cord (an example of a core material) 2. It is composed of a plurality of bobbins (not shown) that are wound and equipped, and has a function of supplying a plurality of steel cords 2 arranged in parallel. In addition to the steel cord, the core material 2 can be variously modified such as a carbon fiber and a polymer synthetic resin fiber.

  The pitch variable part b is configured to change and set the arrangement pitch of the plurality of steel cords 2 that have passed through the core material supply part a, and the pitch variable jig 3 is orthogonal to the conveying direction of the steel cords 2. And a drive mechanism 4 that adjusts the drive movement in the direction. As shown in FIGS. 2 and 3, the pitch variable jig 3 is configured by forming a plurality of deep long grooves 6 in a rectangular parallelepiped block member 5 by the number of steel cords 2 or more. A long hole can be used instead of the long groove 6. If the long hole 6 is used, it is necessary to pass the steel cord 2 from the end in advance, but the side wall portion 7 described later is in a double-sided support state, further improving the accuracy of the arrangement pitch P and the pitch variable jig 3. There is an advantage that the strength can be improved.

  More specifically, the long grooves 6 are formed in parallel with the steel cord 2 being slidably movable, and the arrangement pitch P of the adjacent long grooves 6 gradually changes in a synchronized manner in the longitudinal direction of the long grooves 6. It is configured. Each long groove 6 has a constant groove width w, and is formed in a tapered shape in which the width dimension of the side wall portion 7 between the adjacent long grooves 6, 6 becomes smaller toward the end opening side of the long groove 6. Therefore, if the steel cords 2 guided by the long grooves 6 move toward the back of the long grooves 6, the arrangement pitch P increases, and if the steel cords 2 move toward the openings, the arrangement pitch P decreases. That is, the long grooves 6 are formed in the block material 5 so that all the arrangement pitches P are gradually changed at the same value and at the same rate of change. Although not shown in the drawing, a guide member that restricts the movement of the steel cord 2 in the front-rear direction and does not restrict the movement in the left-right direction directly above or / and directly below the pitch variable jig 3 is provided. However, it is also possible to improve the control accuracy by preventing the pitch variable jig 3 from moving with the forward / backward movement of the pitch variable jig 3.

  The drive mechanism 4 includes a pair of left and right rail guides 8 and 8 that slidably support the pitch variable jig 3, a screw shaft 9 that is screwed into the protruding portion 5 a of the block member 5, and a screw shaft 9 that is forward and backward. The motor 10 is configured to drive and rotate. When the electric motor 10 is driven in the forward direction, the pitch variable jig 3 moves forward (in the direction of arrow A in FIG. 1) to change the direction in which the arrangement pitch P increases, and when driven in the reverse direction, the pitch variable jig 3 When the electric motor 1 is stopped, the arrangement pitch P at that time is maintained if the electric motor 1 is stopped. Reference numeral 15 denotes a bearing transmission mechanism that rotatably supports the screw shaft 9 and transmits the rotational force of the electric motor 10 to the screw shaft 9.

  The rubber supply part c is composed of a rubber supply machine 11 that supplies the rubber 16 to the rubber coating part d. Since the rubber feeder 11 is a known general one, a detailed description is omitted. The rubber coating portion d covers the plurality of steel cords 2 that have passed through the pitch varying jig 3 with the rubber 16 supplied from the rubber feeder 11 to form a rubber layer 16 to form an unvulcanized cord body 17. Means. When the arrangement pitch P of the steel cords 2 is changed widely, the entire width of the unvulcanized cord body 17 after being covered with rubber is also increased and decreased in synchronization. The rubber covering portion d includes, for example, a die for pouring rubber into the steel cord 2 through a plurality of steel cords 2, a pair of left and right rubber guides sandwiching the die from the left and right, and a holder for accommodating and holding these three members. It consists of.

  The conveyance drive unit e converts the conveyance direction of the unvulcanized cord body 17 discharged downward from the rubber coating portion d into a horizontal direction, and also applies a take-up roller that applies a conveyance force to the unvulcanized cord body 17. 13 and a rotation mechanism 14 for driving and rotating the take-up roller 13. That is, by pulling and transporting the unvulcanized cord body 17, the plurality of steel cords 2 are also pulled and transported. The take-up roller 13 prevents the steel cord 2 after passing through the rubber coating portion d, that is, unvulcanized, from the point that the focusing force acts on the plurality of steel cords 2 due to the pulling force thereby to change the arrangement pitch. The cord body 17 (rubber-coated cord 12) is structured to act.

  A manufacturing method for creating the rubber-coated cord 12 embedded in a state where the arrangement pitch of the steel cords 2 is gradually changed using the manufacturing apparatus A having the above configuration will be described. That is, the manufacturing method of the rubber-coated cord 12 includes a pitch control step of controlling the arrangement pitch of the plurality of steel cords 2 in a parallel arrangement state fed from the core material supply portion a using the pitch variable portion b, and a pitch control step. The steel cord 2 that has undergone the above process is covered with the rubber 16 supplied from the rubber supply section c to form a wide belt-like unvulcanized cord body 17.

  In the pitch control process, the arrangement pitch P of the plurality of steel cords 2 delivered from the core material supply unit a is covered with the rubber 16 while being changed depending on the delivery amount of the steel cord 2. That is, by moving the pitch variable jig 3 in the longitudinal direction of the long groove 6 by using the drive mechanism 4 in a state where the plurality of steel cords 2 are passed through the corresponding long grooves 6 of the pitch variable jig 3. The arrangement pitch of the steel cord 2 is changed depending on the feed amount of the steel cord 2.

  That is, as shown in FIG. 2, the arrangement pitch P changes so as to become narrower as the pitch variable jig 3 moves forward and becomes wider as it moves backward. Thereby, the reference full width D of the steel cord 2 when the pitch variable jig 3 is advanced to the limit becomes the minimum value Dmin, and the reference full width D of the steel cord 2 when the pitch variable jig 3 is moved backward to the limit is the maximum value Dmax. become. For example, if the pitch variable jig 3 is advanced along with the conveyance of the steel cord 2, an unvulcanized cord body 17 in which the arrangement pitch of the steel cords 2 is widened toward the lower conveyance side can be created. Further, if the pitch variable jig 3 is moved backward along with the conveyance, the unvulcanized cord body 17 in which the arrangement pitch of the steel cords 2 is narrowed toward the lower conveyance side can be created.

  As described above, the arrangement pitch P of the steel cord 2 can be arbitrarily changed and controlled. For example, when the rubber cord is wound around the tapered cylindrical rubber, the arrangement pitch becomes narrower (high density) as the diameter decreases. If it is controlled to be a sulfur cord body, a fiber-reinforced rubber hose suitable for a pumping tube that requires higher pressure resistance on the discharge side on the smaller diameter side can be created. On the other hand, when wrapping around a cylindrical rubber having a uniform diameter or a larger diameter on the smaller diameter side, unvulcanized so that the arrangement pitch increases (or decreases) toward one end. It is also possible to create a code body.

  Next, an unvulcanized cord body 17 according to the present invention, an unvulcanized cord body 17 according to a conventional manufacturing method, and a product when these are wound around a tapered tubular rubber (an example of a tubular rubber having a tapered portion) ( The rubber coated cord 12) will be described in comparison. Here, as preconditions, a truncated cone-shaped rubber hose (taper) having a total length of Zmm (example: 3420 mm), an outer diameter Ymm at one end (example: 180.7 mm), and an outer diameter Xmm at the other end (example: Y-41.7 mm) In the case of a cylindrical rubber), the unvulcanized rubber cord 17 is wound in a range from a large diameter side diameter of 174 mm to a small diameter side diameter of 153 mm, for example, with a constant incident angle of 55 degrees and without a gap.

  The width of one end of the unvulcanized cord body 17 required under these conditions is 270 mm and the width of the other end is 312.3 mm, which is divided into nine parts, that is, the width of one end is 30 mm and the other end is The unvulcanized cord body 17 formed in a long shape having a width of 34.7 mm is divided into Example 1 (see FIG. 6) and divided into three parts, that is, the width of one end is 90 mm and the width of the other end is 104. An unvulcanized cord body 17 formed in a 1 mm long shape is referred to as Example 2 (see FIG. 7). As shown in FIG. 11, the incident angle means a winding angle α or β (average angle when α = β) formed by the steel cord 2 with respect to the center line Q of the tapered cylindrical rubber 20 in a plan view. Point to.

  The unvulcanized cord body 17 shown in FIG. 4 is cut into a taper shape after rubber coating in a state where a plurality of steel cords 2 are arranged in a comb shape, that is, in a state where adjacent steel cords 2 and 2 are parallel to each other. The arrangement pitch P of the steel cord 2 is constant. A long unvulcanized cord body 17 in which the width of the narrow side end portion having a narrow width is set to 30 mm and the width of the wide side end portion having a wide width is set to 34.7 mm is referred to as Comparative Example 1 (see Patent Document 1). 1). The unvulcanized cord body 17 shown in FIG. 5 exhibits a generally curved substantially fan shape obtained by developing a part of a conical shape, and has a width of one end of 30 mm and a width of the other end. This is formed to 34.7 mm, and is referred to as Comparative Example 2 (by the manufacturing method disclosed in Patent Document 2).

  The states of Comparative Examples 1 and 2 and Example 1 are wound around the above-described tapered tubular rubber 20 to form the rubber-coated cord 12 (fiber reinforcing layer 12), as shown in FIGS. Shown in In the rubber-coated cord 12 using the unvulcanized cord body 17 of Comparative Example 1, as shown in FIG. 8, the increase / decrease change in the arrangement pitch P is impossible and is cut halfway along the end in the width direction. There is also a disadvantage that the end 2t of the steel cord 2 is exposed at the boundary (the boundary between the unvulcanized cord bodies 17 that are wound and adjacent to each other) s. Moreover, the taper-shaped thing shown in FIG. 4 cannot be manufactured directly on a manufacturing method (the cutting process after manufacturing is required) also has a disadvantage.

  In the rubber-coated cord 12 using the unvulcanized cord body 17 of Comparative Example 2, as shown in FIG. 9, the change accuracy of the arrangement pitch P becomes worse as the length of the unvulcanized cord body 17 becomes longer. In addition, the accumulation of the angular deviation causes a disadvantage that the end portions in the width direction of the unvulcanized cord body 17 overlap each other at the boundary s at the large-diameter side end, and the fan-shaped one shown in FIG. It cannot be manufactured directly.

  In the rubber-coated cord 12 using the unvulcanized cord body 17 of Examples 1 and 2, as shown in FIG. 10, the arrangement pitch P can be changed while maintaining a constant high accuracy regardless of the length and the length. It was confirmed that the elongation at an internal pressure of 2 MPa was as small as 1% as a product characteristic, and no twisting occurred. Of course, those of Examples 1 and 2 can be directly manufactured by the manufacturing apparatus A. For reference, various characteristic comparison tables of Comparative Examples 1 and 2 and Examples 1 and 2 are shown in FIG.

  According to the method of manufacturing a rubber-coated cord according to the present invention, an arrangement force is not applied to the steel cord 2 before coating the rubber instead of changing the arrangement pitch (density) of the steel cord 2 by applying an excessive force after coating the steel cord with rubber. Since the shape accuracy and surface shape of the unvulcanized cord body 17 are good and no residual stress remains in the rubber 16, the arrangement pitch P returns to the original state after being covered with rubber. The phenomenon of trying to be solved. Since the arrangement pitch P of the steel cord 2 is controlled to increase and decrease accurately and accurately, when the unvulcanized cord body 17 is wound around the object to be wound such as the tapered tubular rubber 20, the adjacent unvulcanized cord body 17 There are no gaps between the end faces, and there is no overlap, and the rubber joining accuracy is good.

  The unvulcanized cord body 17 produced through the coating step is spirally wound around the outer peripheral surface of the cylindrical rubber 20 having a tapered portion, and the fiber reinforcing layer 12 (rubber-coated cord) is formed on the outer periphery of the cylindrical rubber 20. By forming the winding object 20 in the vicinity of the conveyance lower side of the take-up roller 13 such as creating the formed fiber reinforced rubber hose, the winding process as the rubber-coated cord 12 can be performed almost simultaneously, It is possible to improve efficiency and improve productivity by shortening the process for manufacturing the fiber-reinforced rubber hose.

  Further, it is possible to obtain the unvulcanized cord body 17, that is, the rubber-coated cord 12, in which the arrangement pitch P of the steel cords 2 can be freely changed and set while the operation control is simple with relatively inexpensive equipment. Since the arrangement pitch P can be freely expanded and reduced as desired, the unvulcanized cord body 17 produced thereby is not limited to a tapered shape as a whole, for example, both end portions are large. Even with a drum-shaped rubber hose having a small diameter at the center, it is possible to obtain a rubber-coated cord 12 in which the arrangement pitch of the core material changes with high accuracy.

System diagram showing the outline of the rubber-coated cord manufacturing equipment Front perspective view showing pitch variable jig Action diagram showing the steel cord arrangement pitch variable situation The top view which shows the unvulcanized cord body by the comparative example 1 The top view which shows the unvulcanized cord body by the comparative example 2 The top view which shows the unvulcanized cord body by Example 1 The top view which shows the unvulcanized cord body by Example 2 The top view which shows the state which wound the unvulcanized cord body of FIG. 4 around the taper cylindrical rubber The top view which shows the state which wound the unvulcanized cord body of FIG. 5 around the taper cylindrical rubber The top view which shows the state which wound the unvulcanized cord body of FIG. 6 around the taper cylindrical rubber Partial plan view showing incident angle of steel cord Figure showing a comparison table of specifications of various unvulcanized cords

Explanation of symbols

2 Core material 3 Pitch variable jig 6 Long groove or long hole 12 Fiber reinforcing layer (rubber coating cord)
16 Rubber (rubber layer)
17 Unvulcanized cord body 20 Cylindrical rubber a Core material supply part c Rubber supply part A Rubber coated cord manufacturing apparatus P Core material arrangement pitch

Claims (5)

Manufacture of a rubber-coated cord having a coating step in which a plurality of core materials are coated with rubber supplied from a rubber supply portion to form an unvulcanized cord body having a wide belt shape in a parallel arrangement state fed from the core material supply portion A method,
A method for producing a rubber-coated cord, in which an arrangement pitch of a plurality of core members delivered from the core material supply unit is covered with rubber while being varied depending on a delivery amount of the core material. The long grooves or long holes in which the core material is slidable are formed in parallel for the number of the core materials, and the arrangement pitch of the adjacent long grooves or long holes is synchronized in the longitudinal direction of the long grooves or long holes. Prepare a pitch variable jig configured to gradually change,
The pitch variable jig is moved in the longitudinal direction of the long groove or the long hole while a plurality of core materials fed from the core material supply unit are passed through the long groove or the long hole of the pitch variable jig adjacent to each other. The manufacturing method of the rubber-coated cord according to claim 1, wherein the arrangement pitch of the core material is changed depending on the feed amount of the core material.   2. The fiber reinforced layer is formed on the outer periphery of the cylindrical rubber by winding the unvulcanized cord body produced through the coating step spirally around the outer peripheral surface of the cylindrical rubber having a tapered portion. 3. A method for producing a rubber-coated cord according to 2. In the covering step of forming a wide belt-shaped unvulcanized cord body by coating a plurality of core materials with the rubber supplied from the rubber supply unit in a parallel arrangement state fed from the core material supply unit, the core material supply unit A pitch variable jig used for changing the arrangement pitch of a plurality of core materials sent out from depending on the feed amount of the core material,
The long grooves or long holes in which the core material is slidable are formed in parallel for the number of the core materials, and the arrangement pitch of the adjacent long grooves or long holes is synchronized in the longitudinal direction of the long grooves or long holes. The pitch variable jig is configured to change gradually. The pitch variable jig according to claim 4, wherein the long grooves or the long holes are formed so that all of the arrangement pitches gradually change at the same value and the same change rate.

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