JP2012016751A - Method for cutting rubber sheet material containing reinforcing cord and apparatus of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for cutting a rubber sheet material containing reinforcing cords, with which the rubber sheet material can be cut always along the reinforcing cords, and in addition the cutting apparatus and maintenance do not get complicated, and an apparatus of the same.SOLUTION: A rotatable circular cutting blade 20 which is supported movably in a breadthwise direction of the rubber sheet material 1 is pressed against the rubber sheet material 1, and also a tooth rest roll 30 is rotated synchronously with a conveyor 10 to cause the cutting blade 20 to rotate to follow the rotation of the tooth rest roll 30 by contact with the outer peripheral surface of the tooth rest roll 30. Thus, even if a small angle change or a shift in position of the reinforcing cord occurs, movement of the cutting blade 20 in an axial direction of the tooth rest roll 30 can be varied depending on external force from the reinforcing cord. The cutting blade 20 can be moved in a direction where the cutting advances along the reinforcing cord to be prevented from coming over the reinforcing cord.

Description

  The present invention relates to a method and an apparatus for cutting a reinforcing cord-containing rubber sheet material for cutting a reinforcing cord-containing rubber sheet material used for, for example, a carcass or a belt of a pneumatic tire.

  Generally, a rubber sheet material in which metal reinforcing cords are embedded in parallel at equal intervals is used for a carcass, a belt and the like of a pneumatic tire, and the reinforcing cord is 20 ° to 27 ° with respect to the longitudinal direction of the rubber sheet material. It is provided so that the inclination angle may be made. This rubber sheet material is cut into a predetermined length along the reinforcing cord, wound around a molding drum, and molded together with other tire constituent members.

  As a device for cutting such a rubber sheet material, the rubber sheet material is reinforced by moving the round blade-shaped cutting blade in the width direction of the rubber sheet material while conveying the rubber sheet material in the longitudinal direction by a conveyor. Is known that is cut along the line (for example, see Patent Document 1).

  In addition, as another cutting device, a cutting blade having a circular cutting edge is inserted between the reinforcing cords between one end and the other end in the width direction of the rubber sheet material, and the cutting blade is a rubber sheet material. After moving the rubber part between the reinforcing cords to one end in the width direction of the rubber sheet material by moving the rubber part between the reinforcing cords in the opposite direction, the rubber part between the reinforcing cords is changed to the reverse direction. What cut | disconnected to the width direction other end of this is known (for example, refer patent document 2).

Japanese Patent No. 3134181 Japanese Patent No. 4162887

  When cutting the rubber sheet material, if the cutting angle of the cutting blade is deviated from the inclination angle of the reinforcing cord, the cutting blade rides on the reinforcing cord, the reinforcing cord is cut, and the end of the cut reinforcing cord Will be exposed from the cut surface of the rubber sheet material. For this reason, it is necessary to cut the rubber sheet material between the reinforcing cords at an accurate cutting angle along the reinforcing cords.

  Therefore, in the former cutting apparatus described above, in the former cutting device, the cutting angle of the cutting blade is set to coincide with the inclination angle of the reinforcing cord, and the conveyor transport speed and the moving speed of the cutting blade are synchronized. Thus, the cutting angle of the rubber sheet material is set to the same angle as the inclination angle of the reinforcing cord.

  However, in order to synchronize the conveying speed of the conveyor and the moving speed of the cutting blade according to the cutting angle, it is necessary to strictly control the moving speed of the cutting blade. When cutting various types of rubber sheet material, there is a problem that it is not easy to change the setting of the inclination angle and moving speed of the cutting blade. In addition, the rubber sheet material causes minute fluctuations in the inclination angle and position of the reinforcing cord. Even when the inclination angle of the cutting blade is set and the movement speed is strictly controlled, the cutting blade rides on the reinforcing cord. Cannot be reliably prevented. Therefore, in the cutting apparatus, when a load of a predetermined size or more acts on the cutting blade, the movement of the cutting blade is stopped via the sliding mechanism. There was also a problem that the structure became complicated.

  Moreover, in the latter cutting apparatus, since the cutting edge uses a heated cutting blade having both arc-shaped blades, the cutting resistance becomes larger than a cutting blade that cuts while rotating like a round blade, Cutting failure is likely to occur due to adhesion and accumulation of rubber. For this reason, it is necessary to frequently remove rubber deposits on the cutting blade, and the cutting blade has a complicated shape and is difficult to polish, which requires a lot of labor for maintenance. Furthermore, since the latter cutting device synchronizes the conveying speed of the conveyor and the moving speed of the cutting blade in the same manner as the former cutting device, if a slight change in the inclination angle or position of the reinforcing cord occurs, the reinforcement There is a problem that the cutting blade hits the cord and the reinforcing cord is exposed from the cut end surface of the rubber sheet material.

  The present invention has been made in view of the above-described problems, and the object of the present invention is to cut the rubber sheet material along the reinforcing cord at all times, and to complicate the cutting device and complicate maintenance. It is an object of the present invention to provide a method and apparatus for cutting a rubber sheet material with a reinforcing cord that does not cause a problem.

  In order to achieve the above object, the present invention provides a reinforcing cord for cutting a rubber sheet material along the reinforcing cord while conveying the rubber sheet material in which reinforcing cords are embedded in parallel at equal intervals in the longitudinal direction of the rubber sheet material by a conveyor. In the cutting method of the rubber sheet material, while pressing the rotatable round blade-shaped cutting blade supported to be movable in the width direction of the rubber sheet material on one surface side of the rubber sheet material against the rubber sheet material, The blade receiving roll arranged on the other surface side of the rubber sheet material is rotated so as to be synchronized with the conveyor, and the cutting blade is rotated so as to follow the rotation of the blade receiving roll by contact with the outer peripheral surface of the blade receiving roll. By doing so, the rubber sheet material is cut along the reinforcing cord by the cutting blade and the blade receiving roll.

  In order to achieve the above object, the present invention cuts the rubber sheet material along the reinforcement cord while conveying the rubber sheet material in which the reinforcement cords are embedded in parallel at equal intervals in the longitudinal direction of the rubber sheet material by a conveyor. In a cutting apparatus for a rubber sheet material with a reinforcing cord, a rotatable round blade-shaped cutting blade supported so as to be movable in the width direction of the rubber sheet material and pressed against one surface side of the rubber sheet material, and a rubber sheet The blade receiving roll is disposed on the other surface side of the material and rotates in synchronization with the conveyor, and the cutting blade rotates so as to follow the rotation of the blade receiving roll by contact with the outer peripheral surface of the blade receiving roll. By doing so, the rubber sheet material is cut along the reinforcing cord by the cutting blade and the blade receiving roll.

  Accordingly, since the rotation and movement of the cutting blade are due to contact friction with the outer peripheral surface of the blade receiving roll, when an external force is applied to the cutting blade from the axial direction of the blade receiving roll, the blade receiving roll of the cutting blade according to the external force. The amount of movement in the axial direction changes easily. As a result, when an external force from the reinforcing cord is generated on the cutting blade due to a minute angle change or displacement of the reinforcing cord during cutting, the amount of movement of the cutting blade in the axial direction of the blade receiving roll is increased according to the external force from the reinforcing cord. The cutting blade moves in the cutting progress direction along the reinforcing cord so that the cutting blade does not ride on the reinforcing cord.

According to the present invention, the rubber sheet material can always be cut along the reinforcing cord even when a small angle change or misalignment of the reinforcing cord occurs at the time of cutting. There is an advantage that the reinforcing cord is cut by the cutting blade and is not exposed from the cut surface of the rubber sheet material. Further, since it is possible to prevent the cutting blade from riding on the reinforcing cord without providing a conventional sliding mechanism, the structure can be simplified. Furthermore, unlike the conventional one using a double-edged blade , the removal of rubber deposits adhering to the blade and polishing of the cutting blade are unnecessary, and there is an advantage that frequent maintenance work is not required. .

The front view of the cutting device which shows one Embodiment of this invention Top view of the cutting device Side view of cutting device Perspective view of support mechanism Partial cross-sectional side view showing operation of support mechanism and moving mechanism Plan view showing the cutting process Plan view showing the cutting process Plan view showing the cutting process Plan view showing the cutting process Front view showing the cutting process Front view showing the cutting process Front view showing the cutting process Front view showing the cutting process Front view showing the cutting process Front view showing the cutting process Schematic plan view showing the relationship between the inclination angle of the cutting blade and the inclination angle of the reinforcing cord Schematic side view of cutting blade and blade receiving roll Sectional view showing the cut state The top view which shows the cutting process which concerns on other embodiment of this invention. Partial front sectional view showing a modification of the cutting blade

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. The cutting device of the present embodiment is for cutting a rubber sheet material 1 with a reinforcing cord used for, for example, a carcass or a belt of a pneumatic tire for a passenger car.

The rubber sheet material 1 is made of a sheet-like unvulcanized rubber and is unwound in a longitudinal direction from a winding drum (not shown). A large number of reinforcing cords 1a are embedded in the rubber sheet material 1 in parallel at equal intervals, and a stranded wire of a metal wire is used for each reinforcing cord 1a. Each reinforcing cord 1a forms a predetermined inclination angle θ1 with respect to the longitudinal direction of the rubber sheet material 1, and the inclination angle θ1 is 20 ° to 27 °. 2 and FIG. 6 show only a part of the reinforcing cords 1a. Actually, however, the reinforcing cords 1a are evenly arranged in the longitudinal direction of the rubber sheet material 1. Moreover, the inclination angle with respect to the longitudinal direction of the rubber sheet material 1 means an angle on the acute angle side (hereinafter the same).
The cutting device of this embodiment includes a conveyor 10 that conveys the rubber sheet material 1, a cutting blade 20 that cuts the rubber sheet material 1, a blade receiving roll 30 that rotates while contacting the cutting blade 20, the conveyor 10, and A drive mechanism 40 for driving the blade receiving roll 30, a support mechanism 50 for supporting the cutting blade 20 so as to be movable in the vertical direction, and a moving mechanism 60 for supporting the cutting blade 20 so as to be movable in the width direction of the rubber sheet material 1. And an angle adjusting mechanism 70 for adjusting the inclination angle of the cutting blade 20.

  The conveyor 10 includes a pair of rollers 11 that are spaced apart from each other in the conveying direction of the rubber sheet material 1 and a belt 12 that is wound around each roller 11. Each roller 11 is a pair of frames 13 in the width direction. It is rotatably supported by. Further, the conveyor 10 is provided with a plate-like magnet 14 for attracting the reinforcing cord 1 a of the rubber sheet material 1, and the magnet 14 is disposed below the belt 12 positioned on the upper surface side of the conveyor 10.

  The cutting blade 20 is composed of a round blade that rotates around a support shaft 21, and the blade edge portion of the outer peripheral edge thereof is formed so as to be inclined on both axial surfaces of the cutting blade 20.

  The blade receiving roll 30 is formed so that the outer peripheral surface is made of hard metal and is close to one end side (upstream side in the transport direction) of the conveyor 10. The blade receiving roll 30 is configured to rotate about a support shaft 31, and the support shaft 31 is rotatably supported at both ends by a pair of vertical frames 32 via a bearing 33. The blade edge of the cutting blade 20 comes into contact with the outer peripheral surface of the blade receiving roll 30, and when the blade receiving roll 30 rotates, the cutting blade 20 rotates together with the blade receiving roll 30. In this case, the cutting blade 20 is held by the angle adjusting mechanism 70 so as to form a predetermined inclination angle θ2 with respect to the longitudinal direction of the rubber sheet material 1. As a result, when the blade receiving roll 30 rotates, the cutting blade 20 tries to roll in a direction that forms an inclination angle θ2 with respect to the direction perpendicular to the axial direction of the blade receiving roll 30, so that the cutting blade 20 is moved to the blade receiving roll. The blade receiving roll 30 moves in the axial direction while rotating so as to follow the rotation of the blade receiving roll 30 by contact with the outer peripheral surface of the blade 30.

  The drive mechanism 40 is coaxial with the first sprocket 41 attached to the rotating shaft of the roller 11 on the downstream side in the conveying direction of the conveyor 10 and the second sprocket 42 attached to the support shaft 31 of the blade receiving roll 30. Third and fourth sprockets 43, 44 connected in a shape, a first chain 45 wound around the first sprocket 41 and the third sprocket 43, a second sprocket 42 and a fourth sprocket The second chain 46 is wound around the second chain 46, the fifth sprocket 47 meshes with the second chain 46, and the motor 48 that rotates the fifth sprocket 47.

  In the drive mechanism 40, when the motor 48 rotates, the second chain 46 is driven by the fifth sprocket 47, and the fourth sprocket 44 rotates by the second chain 46. Next, the third sprocket 43 rotates integrally with the fourth sprocket 44, the first chain 45 is driven by the third sprocket 43, and the first sprocket 41 is rotated by the first chain 45. As a result, the rotational force of the motor 48 is transmitted to the roller 11 and the blade receiving roll 30 of the conveyor 10, and the roller 11 and the blade receiving roll 30 of the conveyor 10 rotate in the same direction and at the same speed. ing.

  The support mechanism 50 includes a support member 51 that rotatably supports the cutting blade 20, a support shaft 52 that supports the support member 51, a sleeve 53 that rotatably supports the support shaft 52, and upper and lower portions of the sleeve 53. A pair of fixing plates 54 arranged respectively, a pair of widthwise rods 55 connected to the upper fixing plate 54, a cylinder unit 56 for moving each rod 55 up and down, and the cylinder unit 56 as the width of the rubber sheet 1 It comprises a guide rail 57 that is movably supported in the direction.

  The support member 51 is made of an L-shaped member, and the support shaft 21 of the cutting blade 20 is rotatably supported on its side surface. The support shaft 52 is formed to extend in the vertical direction, and the upper end of the support member 51 is fixed to the lower end thereof. The upper end side of the support shaft 52 passes through the sleeve 53 and is slidably inserted into the cylinder unit 56 so as to move up and down with respect to the cylinder unit 56. The cylinder unit 56 includes an air cylinder (not shown) that drives each rod 55 inside, and by moving each rod 55 up and down, the cutting blade 20, the support member 51, the support shaft 52, the sleeve 53, and the like. Each fixing plate 54 is raised and lowered. The guide rail 57 is provided on the side surface of the horizontal frame 58 that spans the upper end of each column 32 and is slidably engaged with the cylinder unit 56.

  The moving mechanism 60 includes a pair of first pulleys 61 disposed on both ends of the guide rail 57, a belt 62 wound around each first pulley 61, and a second pulley 63 that drives the belt 62. The motor 64 that rotates the second pulley 63, the first clamping plate 65 attached to the cylinder unit 56 of the support mechanism 50, and the second clamping plate attached to the fixed plate 54 above the support mechanism 50 66. The belt 62 is a toothed belt having teeth on the inner surface side, and the second pulley 63 meshes with the inner surface of the belt 62.

  In this moving mechanism 60, as shown in FIG. 5 (a), the first sandwiching plate 65 and the second sandwiching plate 66 are opposed to each other with the belt 62 therebetween, and as shown in FIG. 5 (b). When the second clamping plate 66 is lifted together with the cutting blade 20 by the cylinder unit 56 of the support mechanism 50, the belt 62 is clamped by the clamping plates 65 and 66, and the cylinder unit 56 is connected to the moving mechanism 60. Yes. Accordingly, when the belt 62 is driven by the motor 64, the cylinder unit 56 moves along the guide rail 57 together with the belt 62. 5A, when the second clamping plate 66 is lowered together with the cutting blade 20 by the cylinder unit 56, the clamping plates 65 and 66 are separated from the belt 62, and the cylinder unit 56, the moving mechanism 60, and the like. The connection of is to be released.

  The angle adjustment mechanism 70 includes a rotation plate 71 that rotates integrally with the support shaft 51 integrally with the support member 51 of the support mechanism 50, an arc plate 72 that slidably supports the rotation plate 71, and a sleeve 53. A lock pin 73 penetrating from the side and having one end abutting against the support shaft 52, a support member 74 for supporting the lock pin 73 so as to be movable in the axial direction, and a lock lever 75 for moving the lock pin 73 in the axial direction Thus, the support member 74 is fixed to the upper surface of the rotating plate 71. The lock lever 75 is rotatably attached to the support member 74, and the rotation end side is connected to the other end of the lock pin 73 in the support member 74.

  In this angle adjustment mechanism 70, when the lock lever 75 is rotated upward as shown in FIG. 4, the lock pin 73 is retracted from the support shaft 52, and the rotation plate 71 can be rotated about the support shaft 52. . By rotating the rotating plate 71 in this state, the inclination angle of the cutting blade 20 with respect to the longitudinal direction of the rubber sheet material 1 can be arbitrarily adjusted. When the lock lever 75 is rotated downward, the lock pin 73 moves forward toward the support shaft 52, and one end of the lock pin 73 comes into contact with the support shaft 52. As a result, the lock pin 73 comes into contact with the support shaft 52 and the rotating plate 71 is locked, and the cutting blade 20 is held at the set inclination angle.

  In the cutting apparatus configured as described above, the angle adjusting mechanism 70 sets the inclination angle θ2 of the cutting blade 20 in accordance with the inclination angle θ1 of the reinforcing cord 1a. At this time, as shown in FIG. 16, the inclination angle θ2 of the cutting blade 20 is set to be larger than the inclination angle θ1 of the rubber sheet material 1 by a predetermined angle α (for example, 1 ° to 5 °).

  Next, a method for cutting the rubber sheet material 1 in the cutting apparatus will be described. First, as shown in FIGS. 6 and 10, the cutting blade 20 is positioned at the other end in the width direction by a predetermined distance W from one end in the width direction of the rubber sheet material 1. At that time, the cutting blade 20 stands by at the upper position by the support mechanism 50. Next, the cutting blade 20 is lowered by the support mechanism 50, and the cutting blade 20 is pressed against a portion located on the other end side in the width direction from the one end in the width direction of the rubber sheet material 1 as shown in FIG. Subsequently, the conveyor 10 and the blade receiving roll 30 are rotated in one direction (reverse direction), and the cutting blade 20 is brought into contact with the outer peripheral surface of the blade receiving roll 30 as shown in FIGS. The rubber sheet material 1 is moved to one end in the width direction while being rotated so as to follow the rotation. Thereafter, the conveyor 10 and the blade receiving roll 30 are rotated in the other direction (normal rotation direction), and the cutting blade 20 is brought into contact with the outer peripheral surface of the blade receiving roll 30 as shown in FIGS. The rubber sheet material 1 is cut along the reinforcing cord 1a by being moved toward the other end in the width direction of the rubber sheet material 1 while being rotated so as to follow the rotation of the rubber sheet material 1. At that time, the cut rubber sheet material 1 is sent to the conveyor 10 side while the reinforcement cord 1a is adsorbed by the magnet 14 of the conveyor 10. Then, the cutting of the rubber sheet material 1 is completed by moving the cutting blade 20 to the other end in the width direction of the rubber sheet material 1 as shown in FIGS. Thereafter, the cutting blade 20 is raised by the support mechanism 50 as shown in FIG. 15, thereby connecting the support mechanism 50 to the moving mechanism 60 as shown in FIG. 5B, and the cutting mechanism 20 is moved by the moving mechanism 60. The rubber sheet material 1 is returned to one end side in the width direction.

  In the cutting, the cutting blade 20 moves in the axial direction of the blade receiving roll 30 while rotating so as to follow the rotation of the blade receiving roll 30, but the rotation and movement of the cutting blade 20 is the outer periphery of the blade receiving roll 30. Because of the contact friction with the surface, when an external force is applied to the cutting blade 20 from the axial direction of the blade receiving roll 30, the amount of movement of the cutting blade 20 in the axial direction of the blade receiving roll 30 easily changes according to the external force. To do. That is, at the time of cutting, the cutting blade 20 moves along the reinforcing cord 1a, but an external force from the reinforcing cord 1a may be generated on the side surface of the cutting blade 20 due to a minute angle change or displacement of the reinforcing cord 1a. At that time, the cutting blade 20 is not strongly restrained by the movement due to the contact rotation with the blade receiving roll 30 as described above, and therefore, the amount of movement of the blade receiving roll 30 in the axial direction depends on the external force from the reinforcing cord 1a. It changes and moves along the reinforcement cord 1a so as not to ride on the reinforcement cord 1a.

  Further, since the inclination angle θ2 of the cutting blade 20 is set to be larger by the angle α than the inclination angle θ1 of the reinforcing cord 1a, in the movement from one end side to the other end side in the width direction of the rubber sheet material 1, As shown in FIG. 16, the moving speed V1 of the cutting blade 20 becomes faster than the moving speed V2 of the reinforcing cord 1a on the blade receiving roll 30. Accordingly, when viewed from the direction of arrows AA in FIG. 17, the cutting blade 20 always moves so as to come into contact with the reinforcing cord 1a on the leading side in the cutting progress direction as shown in FIG. It becomes difficult to get on. That is, since the moving amount of the cutting blade 20 changes following the reinforcement cord 1a, the cutting blade 20 and the blade receiving roll 30 are sandwiched between the cutting blade 20 and the blade receiving roll 30 as shown in FIG. When the moving amount M1 is larger than the moving amount M2 of the reinforcing cord 1a, the cutting blade 20 is pushed back to the opposite side in the cutting progress direction by the moving amount M3 of the difference, so that the cutting blade 20 is difficult to ride on the reinforcing cord 1a. On the other hand, since the moving amount of the reinforcing cord 1a does not change following the cutting blade 20, if the moving amount of the cutting blade 20 is larger than the moving amount of the reinforcing cord 1a, the cutting is performed by the difference moving amount. Since the blade 20 is pushed out toward the cutting direction, the cutting blade 20 can easily ride on the reinforcing cord 1a.

  When cutting is started from one end in the width direction of the rubber sheet material 1, the cutting edge of the cutting blade 20 may enter the end of the stranded wire of the reinforcing cord 1a, and the stranded wire of the reinforcing cord 1a may be scattered. On the other hand, in the cutting device, the cutting blade 20 is moved from the one end in the width direction of the rubber sheet material 1 by a predetermined distance W to the one end in the width direction of the rubber sheet material 1 from the one end in the width direction. Since one end side in the width direction of the material 1 is cut, when the cutting blade 20 is moved from one end in the width direction to the other end of the rubber sheet material 1, the cutting blade 20 is already cut in the rubber sheet material 1. Therefore, the cutting edge of the cutting blade 20 does not enter the end of the stranded wire of the reinforcing cord 1a.

  Thus, according to the present embodiment, the rubber sheet material 1 is provided with a rotatable round blade-shaped cutting blade 20 that is supported on one surface side of the rubber sheet material 1 so as to be movable in the width direction of the rubber sheet material 1. The blade receiving roll 30 disposed on the other surface side of the rubber sheet material 1 is rotated so as to be synchronized with the conveyor 10, and the cutting blade 20 is brought into contact with the outer peripheral surface of the blade receiving roll 30 to receive the blade receiving. Since the rubber sheet material 1 is cut along the reinforcing cord 1a by the cutting blade 20 and the blade receiving roll 30 by rotating the roll 30 so as to follow the rotation of the roll 30, a minute angle change of the reinforcing cord 1a is performed. Even when an external force from the reinforcing cord 1a is generated on the side surface of the cutting blade 20 due to the position deviation, the amount of movement of the blade receiving roll 30 in the axial direction can be changed according to the external force from the reinforcing cord 1a. It is possible to cut the rubber sheet material 1 as always along the reinforcing cords 1a. This effectively prevents the cutting blade 20 from riding on the reinforcing cord 1 a, so that the reinforcing cord 1 a is not cut by the cutting blade 20 and is not exposed from the cut surface of the rubber sheet material 1. There is. Moreover, since it is possible to prevent the cutting blade 20 from riding on the reinforcing cord 1a without providing a conventional sliding mechanism, the structure can be simplified. Furthermore, since a round blade-like rotary blade is used as the cutting blade 20, unlike conventional ones using both blades having an arcuate cutting edge, removal of rubber deposits adhering to the blade and polishing of the cutting blade are performed. Has the advantage that no frequent maintenance work is required.

  Further, the cutting blade 20 is inclined so as to form a predetermined inclination angle θ 2 with respect to the longitudinal direction of the rubber sheet material 1, and follows the rotation of the blade receiving roll 30 by contact with the outer peripheral surface of the blade receiving roll 30. Since the rubber sheet material 1 is cut along the inclined reinforcing cord 1a by moving it in the axial direction of the blade receiving roll 30 while rotating in this manner, the cutting blade is cut by the moving mechanism as in the prior art. Compared with the one moved in the direction, control for synchronizing the conveying speed of the conveyor and the moving speed of the cutting blade is not required, and the structure can be simplified. Further, when cutting a plurality of types of rubber sheet materials having different inclination angles of the reinforcing cord 1a, it is only necessary to change the inclination angle of the cutting blade 20, so that the changeover operation can be easily performed. is there.

  In addition, since the inclination angle θ2 of the cutting blade 20 with respect to the longitudinal direction of the rubber sheet material 1 is set to be larger than the inclination angle θ1 of the reinforcing cord 1a by a predetermined angle α, the cutting blade 20 is always on the leading side in the cutting progress direction. It can be moved so as to come into contact with the reinforcing cord 1a, which is extremely advantageous for preventing the cutting blade 20 from riding on the reinforcing cord 1a.

  Further, the cutting blade 20 is pressed against a portion located on the other end side in the width direction from one end in the width direction of the rubber sheet material 1 so that the cutting blade 20 moves to one end in the width direction of the rubber sheet material 1. Since the blade receiving roll 30 is rotated in one direction and then the blade receiving roll 30 is rotated in the other direction so that the cutting blade 20 moves from one end to the other end in the width direction of the rubber sheet material 1, the rubber sheet Unlike the case where the cutting is started from one end in the width direction of the material 1, the cutting edge of the cutting blade 20 does not enter the end of the stranded wire of the reinforcing cord 1a, which is extremely effective in preventing the stranded wire of the reinforcing cord 1a from being scattered. Is.

  Further, after the cutting blade 20 moved from the one axial end side to the other end side of the blade receiving roll 30 by contact rotation with the blade receiving roll 30 is lifted away from the rubber sheet material 1 by the support mechanism 50, the cutting blade 20 is moved from the other end side in the axial direction of the blade receiving roll to one end side by the moving mechanism 60, so that a mechanism for moving the cutting blade 20 from one end side in the axial direction of the blade receiving roll 30 to the other end side is required. Therefore, the structure can be simplified. In particular, the moving mechanism 60 that moves the cutting blade 20 from the other axial end side to the one end side of the blade receiving roll is for returning the cutting blade 20 to the cutting start position, and for cutting the rubber sheet material 1. Since it is not involved, there is no need for synchronous control with the blade receiving roll 30, which is extremely advantageous for simplifying the structure.

  In this case, when the moving mechanism 60 raises the cutting blade 20 by the support mechanism 50, the belt 62 is clamped by the first and second clamping plates 65 and 66 provided on the support mechanism 50 side, and the belt 62 is clamped by the motor 64. Since the cutting blade 20 supported by the support mechanism 50 is moved along the guide rail 57 by driving the support mechanism 50, the connection mechanism 50 and the support mechanism 50 are connected to and disconnected from the support mechanism 50. Therefore, the mechanism for moving the cutting blade 20 can be further simplified.

  Moreover, since the magnet 14 which adsorb | sucks the reinforcement cord 1a of the rubber sheet material 1 sent out from the blade receiving roll 30 side is provided in the conveyor 10, the front end side of the cut rubber sheet material 1 is reliably held on the conveyor 10. It is possible to effectively prevent the rubber sheet material 1 from being bent or loosened when being fed from the blade receiving roll 30 side to the conveyor 10 side.

  FIG. 19 shows another embodiment of the present invention, in which components equivalent to those of the above-described embodiment are denoted by the same reference numerals. Since the configuration other than the configuration shown in the figure is the same as that of the embodiment, the illustration is omitted.

  This embodiment shows the case where the reinforcing cord 1a cuts the rubber sheet material 1 that is not inclined with respect to the longitudinal direction of the rubber sheet material 1 into a predetermined width. Used for heavy duty pneumatic tire belts. In FIG. 19, only a part of the reinforcing cords 1 a is illustrated, but actually, the reinforcing cords 1 a are evenly arranged in the width direction of the rubber sheet material 1.

  In the present embodiment, the inclination angle of the cutting blade 80 is set to 0 °, the cutting blade 80 is pressed against a predetermined position in the width direction of the rubber sheet material 1, and the blade receiving roll 30 is rotated so as to be synchronized with the conveyor 10. The rubber sheet material 1 is reinforced by the cutting blade 20 and the blade receiving roll 30 by rotating the cutting blade 20 so as to follow the rotation of the blade receiving roll 30 by contact with the outer peripheral surface of the blade receiving roll 30. Cut along 1a. As a result, even when a slight fluctuation occurs in the position in the width direction of the reinforcing cord 1a, the cutting blade 20 can be moved in the axial direction of the blade receiving roll 30 according to the external force from the reinforcing cord 1a, and the rubber sheet The material 1 can always be cut along the reinforcing cord 1a. Accordingly, as in the above-described embodiment, the cutting blade 20 can be effectively prevented from climbing onto the reinforcing cord 1a, so that the reinforcing cord 1a is cut by the cutting blade 20 and exposed from the cut surface of the rubber sheet material 1. There is an advantage of not having to.

  FIG. 20 shows a modification of the cutting blade, which can be used in place of the cutting blade 20. The cutting blade 80 shown in the figure includes a first inclined surface 81 formed on the blade edge side and a second inclined surface 82 formed on the radially inner side of the first inclined surface 81, respectively. The first inclined surface 81 and the second inclined surface 82 are formed continuously from each other on both sides in the axial direction. In this case, the cutting blade 80 is formed such that the angle φ1 formed by the first inclined surface 81 is larger than the angle φ2 formed by the second inclined surface 82, and φ1 of the first inclined surface 81 is 30 ° to 30 °. 120 ° (preferably 50 ° to 100 °). The second inclined surface 82 is formed so that the angle φ2 forms 28 °.

  When this cutting blade 80 is used, since the angle φ1 of the cutting edge of the cutting blade 80 is larger than that of the cutting blade 20 having a uniform inclined surface as in the above-described embodiment, wear of the cutting edge is reduced. At the same time, the corners of the blade edge have an appropriate roundness. Thereby, it becomes possible to cut | disconnect so that the rubber sheet material 1 may be crushed between the outer peripheral surface of the blade receiving roll 30, and the cutting blade 80, and stable cutting | disconnection can be maintained over a long period of time.

  DESCRIPTION OF SYMBOLS 1 ... Rubber sheet material, 1a ... Reinforcement cord, 10 ... Conveyor, 14 ... Magnet, 20 ... Cutting blade, 30 ... Blade receiving roll, 40 ... Drive mechanism, 50 ... Support mechanism, 60 ... Moving mechanism, 70 ... Angle adjustment mechanism 80 ... Cutting blade.

Claims (11)

In the cutting method of the rubber sheet material with the reinforcing cord, the rubber sheet material in which the reinforcing cords are embedded in parallel at equal intervals is conveyed along the reinforcing cord while the rubber sheet material is conveyed in the longitudinal direction of the rubber sheet material by a conveyor.
While pressing against the rubber sheet material a rotatable round blade-shaped cutting blade supported movably in the width direction of the rubber sheet material on one surface side of the rubber sheet material,
Rotate the blade receiving roll arranged on the other side of the rubber sheet material to synchronize with the conveyor,
The rubber sheet material is cut along the reinforcing cord by the cutting blade and the blade receiving roll by rotating the cutting blade so as to follow the rotation of the blade receiving roll by contact with the outer peripheral surface of the blade receiving roll. A method of cutting a rubber sheet material containing a reinforcing cord. The axial direction of the blade receiving roll while rotating the cutting blade having a predetermined inclination angle with respect to the longitudinal direction of the rubber sheet material so as to follow the rotation of the blade receiving roll by contact with the outer peripheral surface of the blade receiving roll The rubber sheet material having reinforcing cords inclined with respect to the longitudinal direction of the rubber sheet material is cut along the reinforcing cords by cutting the rubber sheet material. Method. The method for cutting a rubber sheet with a reinforcing cord according to claim 2, wherein the inclination angle of the cutting blade with respect to the longitudinal direction of the rubber sheet material is made larger than the inclination angle of the reinforcing cord by a predetermined angle. While pressing the cutting blade against a portion located on the other end side in the width direction by a predetermined distance from one end in the width direction of the rubber sheet material,
After rotating the blade receiving roll to one side so that the cutting blade moves to one end in the width direction of the rubber sheet material,
The method of cutting a rubber sheet material with a reinforcing cord according to claim 2 or 3, wherein the blade receiving roll is rotated to the other side so that the cutting blade moves from one end to the other end in the width direction of the rubber sheet material. In a cutting apparatus for a rubber sheet material with a reinforcing cord that cuts the rubber sheet material along the reinforcing cord while conveying the rubber sheet material in which reinforcing cords are embedded in parallel at equal intervals in the longitudinal direction of the rubber sheet material by a conveyor,
A rotatable round blade-shaped cutting blade supported so as to be movable in the width direction of the rubber sheet material and pressed against one surface side of the rubber sheet material;
A blade receiving roll disposed on the other surface side of the rubber sheet material and rotating to synchronize with the conveyor;
By rotating the cutting blade so as to follow the rotation of the blade receiving roll by contact with the outer peripheral surface of the blade receiving roll, the rubber sheet material is cut along the reinforcing cord by the cutting blade and the blade receiving roll. A rubber sheet material cutting device with a reinforcing cord, characterized by comprising. The cutting blade is provided so as to form a predetermined inclination angle with respect to the longitudinal direction of the rubber sheet material,
The cutting blade is tilted with respect to the longitudinal direction of the rubber sheet material by moving in the axial direction of the blade receiving roll while rotating so as to follow the rotation of the blade receiving roll by contact with the outer peripheral surface of the blade receiving roll. The rubber sheet material having a reinforcing cord is configured to cut the rubber sheet material along the reinforcing cord. The cutting apparatus for a rubber sheet material with a reinforcing cord according to claim 6, wherein the cutting blade is provided such that an inclination angle with respect to a longitudinal direction of the rubber sheet material is larger by a predetermined angle than an inclination angle of the reinforcing cord. The cutting blade is pressed against a portion located on the other end side in the width direction by a predetermined distance from one end in the width direction of the rubber sheet material,
After the blade receiving roll rotates to one side so that the cutting blade moves to one end in the width direction of the rubber sheet material,
The cutting device for a rubber sheet material with a reinforcing cord according to claim 6 or 7, wherein the blade receiving roll rotates to the other side so that the cutting blade moves from one end to the other end in the width direction of the rubber sheet material. A moving mechanism for moving the cutting blade moved from one end side in the axial direction of the blade receiving roll to the other end side while being separated from the rubber sheet material, from the other end side in the axial direction of the blade receiving roll; The rubber sheet material cutting device containing a reinforcing cord according to claim 6, 7 or 8. The conveyor is arranged on the downstream side in the conveying direction with respect to the blade receiving roll,
10. The rubber sheet containing a reinforcing cord according to claim 6, 7, 8 or 9, wherein the conveyor is provided with a magnet for adsorbing a metal reinforcing cord of the rubber sheet material fed from the blade receiving roll side. Cutting device. The cutting blade is provided with a first inclined surface formed on the blade edge side and a second inclined surface formed on the radially inner side of the first inclined surface on both axial sides of the cutting blade,
The reinforcement according to claim 5, 6, 7, 8, 9 or 10, wherein the cutting blade is formed such that an angle formed by the first inclined surface is larger than an angle formed by the second inclined surface. Cutting device for corded rubber sheet material.

Images