JP2000198095A - Method of and device for cutting band-like rubber material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply and surely cut a band-like rubber material even having a large thickness or a cutting face with a small inclined angle. SOLUTION: In a device for cutting a band-like rubber material, when a motor 69 is operated so as to move a movable frame 26, a metal wire 53 and a running means 69 in the substantially widthwise direction of the band-like rubber member 16 while a motor 54 is operated so as to run the metal wire 53 at a high speed in the longitudinal direction, the band-like rubber member 16 is cut by the metal wire 53. Since the band-like rubber member 16 is cut by the thin metal wire 53, the contact area between the band-like rubber member 16 and the metal wire 53 is extremely small, thereby it is possible to simply and surely cut the band-like rubber member.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for cutting a band-shaped rubber member used for manufacturing a pneumatic tire.

[0002]

2. Description of the Related Art In general, when a pneumatic tire is manufactured, a belt-shaped rubber member is cut into a predetermined length to cut out a tread rubber, and the tread rubber is attached to the outside of a belt layer or a breaker layer. Although both ends of the rubber are butt-joined, such a tread rubber is usually cut out from the band-shaped rubber member to increase the strength of the above-mentioned joints and to make the gauge uniform.
The cut surface is inclined at a predetermined angle with respect to the surface of the band-shaped rubber member.

Here, the above-mentioned band-shaped rubber member is cut by, for example, a guillotine-type cutting device in which an upper blade is brought closer to a lower blade, and the band-shaped rubber member therebetween is pushed by the upper blade.
Alternatively, it is performed by a rotary cutter type cutting device that cuts a band-shaped rubber member between them by rotating the thin disk along the anvil while rotating the disk.

[0004]

However, in the conventional band rubber member cutting device as described above, the band rubber member is thick or the inclination angle of the cut surface with respect to the surface of the band rubber member. When the angle is low (40 degrees or less), the upper blade and the disk penetrate deeply into the belt-shaped rubber member during cutting, increasing the contact area, and as a result, a large frictional resistance is generated between the two to cut. There is a problem that it becomes difficult.

The present invention provides a method for cutting a rubber band member which can easily and surely cut the rubber band member even if the rubber band member is thick or the inclination angle of the cut surface is low. It is intended to provide a device.

[0006]

SUMMARY OF THE INVENTION The purpose of the invention is as follows.
Cutting the band-shaped rubber member by cutting the band-shaped rubber member by relatively moving along the surface of the band-shaped rubber member while intersecting the elongated cutting member running in the longitudinal direction with the surface of the band-shaped rubber member. By the method, second,
Running means for running an elongated cutting member intersecting the surface of the band-shaped rubber member in the longitudinal direction; moving means for moving the cutting member and the band-shaped rubber member relative to each other along the surface of the band-shaped rubber member This can be achieved by a band-shaped rubber member cutting device having the following.

[0007] When cutting the band-shaped rubber member, the cutting member is caused to travel in the longitudinal direction by the traveling means, and crosses the surface of the belt-shaped rubber member. The rubber member is relatively moved along the surface of the belt-shaped rubber member. As a result, the belt-shaped rubber member is cut, and the intersection angle between the cut surface and the surface of the belt-shaped rubber member at this time is the same as the intersection angle of the cutting member with respect to the surface of the belt-shaped rubber member. Here, even if the thickness of the band-shaped rubber member is thick, or the crossing angle of the cut surface with the surface of the band-shaped rubber member is small, the cutting of the band-shaped rubber member is performed by running the elongated cutting member. Therefore, the area of contact between the band-shaped rubber member and the cutting member at the time of cutting is always small, so that the band-shaped rubber member can be cut easily and reliably.

Further, according to the structure of the third aspect, the intersection angle between the cut surface and the surface of the belt-shaped rubber member can be easily adjusted to an arbitrary angle. Further, according to the structure as described in claim 4, continuous cutting is possible, and work efficiency is improved. In addition, with the configuration as described in claim 5, the structure can be simplified.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 11 denotes a rotatable cylindrical forming drum which can be enlarged and reduced in diameter, and a belt layer 12, which is a component member of a pneumatic tire, is wound around the outer periphery of the forming drum 11. Reference numeral 15 denotes a rear conveyor extending in the front-rear direction provided behind the forming drum 11, and a belt-shaped rubber member 16 made of a single layer or a plurality of layers of rubber is provided on the rear conveyor 15 in parallel with the rear conveyor 15. Is placed. The belt-shaped rubber member 16 is conveyed in the longitudinal direction, here forward, by the rear conveyor 15 traveling. 17 is the forming drum 11 and the rear conveyor
15 is an intermediate conveyor installed in the front-rear direction and installed between the rear conveyor 15 and the rear end of the intermediate conveyor 17.
A gap 18 is formed between the front end and the front end. Then, the intermediate conveyor 17 can also convey the belt-shaped rubber member 16 forward like the rear conveyor 15.

Reference numeral 21 denotes a base installed directly below the intermediate conveyor 17, and extends on the upper surface of the base 21 in a substantially width direction of the band-shaped rubber member 16, and here extends in a cutting direction of the band-shaped rubber member 16. A pair of horizontal guide rails 22 is laid. Reference numeral 26 denotes a moving frame installed directly above the base 21.The moving frame 26 includes an upper horizontal portion 27 located immediately above the intermediate conveyor 17, a lower horizontal portion 28 located immediately below the intermediate conveyor 17, and A connecting portion 29 is provided on one side of the conveyor 17 and vertically connects one ends of the upper and lower horizontal portions 27 and 28, and has a U-shape as a whole. Slide bearings 30 slidably engaged with the guide rails 22 are fixed to the lower four corners of the lower horizontal portion 28 of the moving frame 26. As a result, the moving frame 26 is guided by the guide rails 22. The belt-like rubber member 16 can move in a substantially width direction (cutting direction).

A guide rod 33 extending substantially in the front-rear direction on a plane parallel to the surface 16a of the belt-shaped rubber member 16 is attached to the other side surface and the rear end of the upper horizontal portion 27. The guide rod 33 is movable. A table 34 is slidably supported. Reference numeral 35 denotes a roller rotatably supported at the front end (rear end) of the movable base 34. The roller 35 has a rotation axis parallel to the guide rail 22 (a traveling means 59 and a belt-like rubber member described later).
16 in the direction of relative movement), and a circumferential groove having a semicircular cross section is formed on the outer periphery thereof. Reference numeral 36 denotes a screw shaft screwed into the movable base 34. The screw shaft 36 extends parallel to the guide rod 33. 37 is the upper horizontal part
27 is a motor fixed to the other side surface, and the output shaft of the motor 37 and the screw shaft 36 are connected to each other while maintaining a coaxial relationship. As a result, the motor 37 is operated and the screw shaft
When 36 rotates, the movable table 34 and the roller 35 are guided by the guide rod 33, and along a straight line perpendicular to the axis of the roller 35 in a plane parallel to the surface 16a of the belt-shaped rubber member 16,
Here, it can move substantially in the front-back direction.

A guide rod 40 parallel to the guide rod 33 is attached to the other side surface of the lower horizontal portion 28 at the center thereof, and a movable table 41 is slidably supported by the guide rod 40. ing. Reference numeral 42 denotes a roller rotatably supported at the front end (rear end) of the movable base 41. The roller 42 has a rotation axis extending parallel to the rotation axis of the roller 35 and a circle having a semicircular cross section on the outer periphery thereof. A circumferential groove is formed. Thus, the roller 35 is located above the band-shaped rubber member 16, while the roller 42 is located below the band-shaped rubber member 16,
As a result, the pair of rollers 35 and 42
Are arranged on both sides in the thickness direction. Reference numeral 43 denotes a screw shaft screwed into the movable base 41, and the screw shaft 43 extends in parallel with the guide rod 40. Reference numeral 44 denotes a motor fixed to the other side surface of the lower horizontal portion 28. The output shaft of the motor 44 and the screw shaft 43 are connected to each other while maintaining a coaxial relationship. As a result, when the motor 44 operates and the screw shaft 43 rotates, the movable table 41 and the rollers 42
In this case, the roller can move in a plane parallel to the surface 16a of the belt-shaped rubber member 16 along a straight line perpendicular to the axis of the roller 42, in this case, substantially in the front-rear direction.

Here, the rollers 35 and 42 move in opposite directions because the screw shaft 36 and the screw shaft 43 are rotated in opposite directions. As a result, the rollers 35 and 42 are moved together by the movement. Approach and separate. Guide rods 33 and 40 described above, screw shaft
The motors 37, 44 and the motors 37, 44 as a whole constitute a changing mechanism 47 for moving the rollers 35, 42 in opposite directions along a straight line perpendicular to the axis of the rollers 35, 42.

Reference numeral 51 denotes an application roller rotatably supported on one side surface of the upper horizontal portion 27 at the front end thereof.
The application roller 52 is also rotatably supported on the lower horizontal portion 28 immediately below the 51. A circumferential groove having a semicircular cross section similar to that of the rollers 35 and 42 is formed on the outer periphery of the applying rollers 51 and 52. Reference numeral 53 denotes a thin metal wire having a circular cross section as a cutting member and having an endless shape, here a thin metal wire having a diameter of about 0.3 mm, and the metal wire 53 is partially formed by the rollers 35 and 42 and the application rollers 51 and 52. It is stretched while being inserted into the circumferential groove. 54 is a lower horizontal portion 28 behind the applying roller 52
A belt 57 is stretched between a pulley 55 connected to an output shaft of the motor 54 and a pulley 56 attached to the applying roller 52.
Then, the rotational driving force of the motor 54 is applied to the applying roller 52 via the belt 57, and the metal wire 53 runs at a high speed in the longitudinal direction, here at a speed of about 1200 m / s.

The two application rollers 51 and 52 and the motor 54 constitute an application mechanism 58 for applying a running force to the metal wire 53 as a whole. Here, the metal wire 53 located between the rollers 35 and 42 intersects with the belt-shaped rubber member 16 that is stretched over the gap 18 between the rear conveyor 15 and the intermediate conveyor 17, When the rollers 35 and 42 move in the opposite direction by the operation of the change mechanism 47, the metal wire 53
The intersection angle G with respect to the surface 16a changes. The rollers 35 and 42, the change mechanism 47, and the application mechanism 58 as a whole constitute traveling means 59 for traveling in the longitudinal direction of the elongated metal wire 53 crossing the surface 16a of the belt-shaped rubber member 16. .

Rollers 61, 62 and 63 are arranged between the motor 37 and the application roller 51, and among these rollers 61, 62 and 63, the rollers 61 and 62 are rotatably supported by the upper horizontal portion 27. On the other hand, a roller 64 disposed between these rollers 61 and 62 has a spring 64 having one end locked to the upper horizontal portion 27.
Are connected to each other. And these rollers 61, 6
The metal wire 53 is wrapped around the metal wires 53 while being bent in a U-shape. As a result, a constant tension is always applied to the entire metal wire 53. The rollers 61, 62, 63 and the spring 64 as a whole constitute a tension applying mechanism 65 for applying a constant tension to the metal wire 53.

A motor 69 is mounted on the base 21 on one side of the moving frame 26, and a pulley 71 is fixed to a tip of an output shaft 70 of the motor 69. A pulley (not shown) is rotatably supported on the base 21 on the other side of the moving frame 26. An endless belt extending parallel to the guide rail 22 is provided between the pulley and the pulley 71. 72 have been passed over. Both ends of the belt 72 are locked by connecting pieces 73 fixed to the lower surface of the moving frame 26. As a result, when the motor 69 operates and the belt 72 travels, the moving frame 26, the metal wire 53, and the traveling means 59 are united to cut the belt-like rubber member 16 along the surface 16a of the belt-like rubber member 16. Move in the direction. The above-described motor 69 and belt 72 as a whole constitute a moving means 74 for relatively moving the traveling means 59 and the metal wire 53 and the band-shaped rubber member 16 along the surface 16a of the band-shaped rubber member 16. Reference numeral 75 denotes a front conveyor disposed between the forming drum 11 and the intermediate conveyor 17, and the front conveyor 75 is cut out from the band rubber member 16 by cutting the band rubber member 16 by the metal wire 53. The tread rubber 76 having a predetermined length is received from the intermediate conveyor 17 and supplied to the forming drum 11. A metal wire 53 located between the application rollers 51 and 52 travels between the front conveyor 75 and the intermediate conveyor 17.

Next, the operation of the first embodiment of the present invention will be described. Now, it is assumed that the tread rubber 76 cut out from the belt-shaped rubber member 16 is supplied from the front conveyor 75 to the rotating forming drum 11 and is wound around the belt layer 12. At this time, the belt-shaped rubber member 16 is placed on the intermediate conveyors 15 and 17 on the rear side, and the starting end thereof is
17 is located near the front end. In this state, the motor 54 is operated to move the metal wire 53 at a high speed in the longitudinal direction while the motor 69 is operated to move the moving frame 26, the metal wire 53, and the traveling means.
59 is moved to one side along the surface 16a of the rubber band member 16. As a result, the metal wire 53 between the rollers 35 and 42 is pressed against the other end of the belt-shaped rubber member 16 while traveling in the longitudinal direction,
As a result, the band-shaped rubber member 16 is gradually cut by the metal wire 53 from the other end to the one end.

At this time, the metal wire 53 between the rollers 35 and 42 is
Since it crosses the surface 16a of the band-shaped rubber member 16 at a predetermined angle G, the cut surface 16b of the band-shaped rubber member 16 is
Is inclined at the same intersection angle H as the intersection angle G. Here, the thickness of the band-shaped rubber member 16 is large, or the intersection angle H of the cut surface 16b with respect to the surface 16a is
Even when the angle is as low as 40 degrees or less, the band-shaped rubber member 16 is cut by running the elongated metal wire 53, so that the band-shaped rubber member 16 and the metal wire 53 are cut at the time of cutting.
The contact area with the belt is always small.
16 can be easily and reliably cut.

When the band-shaped rubber member 16 is cut, a constant tension is applied to the entire metal wire 53 by the tension applying mechanism 65, so that the band-shaped rubber member 16 can be cut smoothly and accurately. Further, in this embodiment, since the endless metal wire is used as the metal wire 53, continuous cutting based on continuous running is possible, and as a result, work efficiency is improved. In this way, the band-shaped rubber member 16 is cut in the width direction by the metal wire 53, and the tread rubber 76 is cut out,
The tread rubber 76 is transferred from the intermediate conveyor 17 to the front conveyor 75 by the synchronous operation of the intermediate conveyor 17 and the front conveyor 75. Thereafter, the tread rubber 76 is supplied to the forming drum 11, and the motor 69 is operated to return the moving frame 26, the metal wire 53, and the traveling means 59 to the initial positions.

Further, the type of the band-shaped rubber member 16 is changed,
When the intersection angle H of the cut surface 16b is changed, the motor
37, 44 are operated to move the rollers 35, 42 in the reverse direction, whereby the metal wire 53 between the rollers 35, 42 and the belt-shaped rubber member 16 are moved.
The intersection angle G with the surface 16a is changed to a desired value.
If the traveling means 59 is composed of the rollers 35 and 42, the change mechanism 47, and the application mechanism 58 as described above, the intersection angle H between the cut surface 16b of the band-shaped rubber member 16 and the surface 16a of the band-shaped rubber member 16 is obtained. Can be easily adjusted to any angle.

FIG. 2 is a diagram showing a second embodiment of the present invention. In this embodiment, a wound metal wire 79 as a cutting member is wound around a pair of rollers 77, 78 disposed on both sides in the thickness direction of the band-shaped rubber member 16 many times, and between these rollers 77, 78. Some of them are overhanging. A pulley fixed to the roller 77
A belt 83 is stretched between 80 and a pulley 82 fixed to an output shaft of a motor 81, and a rotational driving force is applied from the motor 81 to the roller 77 via the pulleys 80, 82 and the belt 83. . On the other hand, a belt 87 is also stretched between a pulley 84 fixed to the roller 78 and a pulley 86 fixed to the output shaft of the motor 85, and the rotational driving force of the motor 85 is applied to the pulleys 84, 86 and the belt 87. This is applied to the roller 78 through the roller. Here, the above-mentioned pair of motors 81 and 85 as a whole constitutes changing means 88 that alternately applies a rotational force to the rollers 77 and 78 and causes the metal wire 79 to run repeatedly in the forward and reverse directions.

In the case of this embodiment, one of the motors 81 and 85 is operated, so that the metal wire
While the 79 is unwound from the roller 77 or the roller 78, it is wound around the roller 78 or the roller 77, thereby forming the metal wire 79.
Are run in the longitudinal direction when the belt-shaped rubber member 16 is cut. Also, if configured as in this embodiment,
Since the application rollers 51 and 52, which are required in the first embodiment, can be omitted, the overall structure can be simplified.

FIG. 3 is a diagram showing a third embodiment of the present invention. In this embodiment, in order to remove (trim) a band-shaped rubber member 91 formed by a pair of calender rolls 90, for example, both widthwise end portions of a rubberized cord, both side end portions of the band-shaped rubber member 91 are removed. It is cut in the longitudinal direction. Here, the cutting device used for such cutting includes rollers 92 and 93 arranged on both sides in the thickness direction of the band-shaped rubber member 91, and application rollers 94 arranged on the side of the band-shaped rubber member 91. An endless metal wire 95 as a cutting member is stretched over the rollers 92 and 93 and the application roller 94.

In this embodiment, the metal wire 95 is caused to travel by rotating the stationary application roller 94 by the motor 96, and the belt-shaped rubber member 91 is conveyed and moved in the longitudinal direction. Both ends in the width direction of the band-shaped rubber member 91 are cut and removed by the metal wire 95.

In the above-described embodiment, the cutting member is constituted by the thin metal wire 53 having a circular cross section. However, in the present invention, the cutting member is constituted by a narrow and thin metal band. It may be. Further, in the first embodiment described above, two application rollers 51 and 52 are provided. However, the number of application rollers may be one as in the third embodiment, and in other words, at least one is sufficient. Further, in the above-described embodiment, the case where the belt-shaped rubber member is a single layer or a plurality of layers of rubber, for example, a belt-shaped tread, has been described, but in the present invention, the belt-shaped rubber member is a laminate in which an inner liner and a side rubber are preset. It may be a rubber member or a laminated rubber member including a ply.

[0027]

As described above, according to the present invention, even if the band-shaped rubber member is thick or the inclination angle of the cut surface is low, the band-shaped rubber member can be cut easily and reliably. be able to.

[Brief description of the drawings]

FIG. 1 is a schematic front view showing a first embodiment of the present invention.

FIG. 2 is a front view showing the vicinity of a roller according to a second embodiment of the present invention.

FIG. 3 is a schematic perspective view showing a third embodiment of the present invention.

[Explanation of symbols]

 16 belt-like rubber member 16a surface 35, 42 roller 47 changing mechanism 51, 52 applying roller 53 cutting member 54 motor 58 applying mechanism 59 traveling means 74 moving means 77, 78 roller 79 cutting Member 81, 85: Motor G: Crossing angle

Claims (5)

[Claims] 1. A belt-shaped rubber member is cut by relatively moving an elongated cutting member running in a longitudinal direction along the surface of the belt-shaped rubber member while intersecting the surface of the band-shaped rubber member. A method of cutting a belt-shaped rubber member, which is characterized by the following. 2. A running means for running an elongated cutting member crossing the surface of the band-shaped rubber member in the longitudinal direction, and the running means, the cutting member and the band-shaped rubber member along the surface of the band-shaped rubber member. A cutting device for a belt-shaped rubber member, comprising a moving means for relatively moving. 3. A pair of rollers disposed on both sides in the thickness direction of the band-shaped rubber member and rotatable around an axis extending in the direction of the relative movement, and having the cutting member stretched over the running member, and A changing mechanism for changing the intersection angle between the cutting member located between the rollers and the surface of the belt-shaped rubber member by moving the cutting member in a reverse direction along a straight line perpendicular to the axis of the roller; 3. An apparatus for cutting a belt-shaped rubber member according to claim 2, comprising an application mechanism for applying a force. 4. A belt-shaped belt according to claim 3, wherein said imparting mechanism comprises at least one imparting roller over which an endless cutting member is stretched, and a motor for imparting a rotational driving force to said roller or imparting roller. Rubber member cutting device. 5. An apparatus for cutting a rubber band member according to claim 3, wherein said end cutting member is wound around said pair of rollers, respectively, and said changing means comprises a pair of motors for applying a rotational force to each roller.