JP6972988B2 - Cutting method and cutting device for unvulcanized rubber strips - Google Patents

Description

The present invention relates to a method for cutting an unvulcanized rubber strip and a cutting device.

Conventionally, a method of winding a plurality of unvulcanized rubber strips around a cylindrical portion of a molded drum to manufacture a rubber product has been known.
In this case, it is necessary to prepare a plurality of unvulcanized rubber strips having a predetermined length.
Therefore, conventionally, the direction in which the unvulcanized rubber strip unwound from the raw fabric is manually crossed with the longitudinal direction of the unvulcanized rubber strip by using a cutter with the unvulcanized rubber strip extending on the upper surface of the work table. By cutting into a plurality of unvulcanized rubber strips having a predetermined length, it has been required to improve the efficiency of the cutting work.
Therefore, when cutting the unvulcanized rubber strip, the two cutters are pierced into the center of the unvulcanized rubber strip in the width direction in a state of being closely arranged along the extending direction of the portion to be cut, and these cutters are used. A technique has been proposed in which the unvulcanized rubber strip is moved from the center in the width direction toward both ends in the width direction along the extending direction of the portion to be cut (see Patent Document 1).
According to this Patent Document 1, the time required for cutting the unvulcanized rubber strip can be shortened, which is advantageous in improving the efficiency of the cutting work of the unvulcanized rubber strip made of unvulcanized rubber. There is.

Japanese Unexamined Patent Publication No. 2015-202550

However, in Patent Document 1, although it is advantageous in improving work efficiency, the cut surface may be deformed due to the strong adhesiveness of the unvulcanized rubber strip, and the cut surface may be deformed. There is room for improvement in suppressing the deformation of.
This is because, for example, when a plurality of strip-shaped members are wound around a cylindrical portion of a molded drum to manufacture a rubber product, the cut surfaces of the cut strip-shaped members are overlapped with each other, so that the shape of the cut surface is as flat and deformed as possible. This is because it is preferable not to do so.
The present invention has been devised in view of the above circumstances, and an object thereof is advantageous in suppressing deformation of the cut surface when cutting an unvulcanized rubber strip-shaped member and obtaining a flat cut surface. It is an object of the present invention to provide a method for cutting a strip-shaped member made of unvulcanized rubber and a cutting device.

In order to achieve the above object, the present invention is a method for cutting an unvulnerable rubber strip by cutting a raw rubber strip with a cutting edge extending linearly of a cutter, wherein the untreated rubber strip is cut. A first holding plate having a cutter insertion groove extending in a direction intersecting the longitudinal direction of the rubber and a contact plate having a surface having a surface having the same hardness as the cutting edge extend in the same extending direction as the cutter insertion groove. The entire length of the cutting edge used at the time of cutting is heated from the longitudinal tip of the cutting edge of the cutter at a position away from the arranged second holding plate and the place where the untreated rubber strip is cut by the cutter. The cutter is heated by the heating unit, and the unvulverated rubber strip is sandwiched by the first holding plate and the second holding plate from both sides in the thickness direction, and the heating is performed. The cutter is separated from the heating portion, and the cutter is placed in a cutting posture in which the cutting edge is tilted so that the cutting edge is positioned in front of the traveling direction as the cutting edge is separated from the longitudinal tip of the cutting edge. To move the cutter linearly along the extending direction of the cutter insertion groove in the cutter insertion groove while bringing the tip of the blade edge of the cutter having heat and residual heat in contact with the surface of the contact plate. It is characterized in that the unsulfurized rubber strip is cut in the above.
Further, the present invention is a cutting device for cutting an unsulfided rubber strip by a cutting edge extending linearly in a cutter in a direction intersecting the longitudinal direction thereof, and the same as the longitudinal direction of the untreated rubber strip. A first holding plate having a cutter insertion groove extending in the intersecting direction and a contact plate having a surface having a surface having the same hardness as the cutting edge are arranged so as to extend in the same extending direction as the cutter insertion groove. A sandwiching portion that enables the untreated rubber strip to be sandwiched between the sandwiching plate from both sides in the thickness direction of the untreated rubber strip, and the length of the cutting edge of the cutter at a position away from the sandwiching portion. The heating portion that heats the entire length of the cutting edge used at the time of cutting from the tip in the direction, and the cutting edge moves in the traveling direction as the distance from the tip in the longitudinal direction of the cutting edge with respect to the thickness direction of the unvulverized rubber strip. In the cutting posture tilted so as to be located forward, the cutter is moved between the heating portion and the sandwiching portion on an extension line in the extending direction of the cutter insertion groove, and the sandwiching portion is used in the sandwiching portion. The sandwiched unvulverized rubber strip is linearly moved along the extending direction of the cutter insertion groove in the cutter insertion groove while the tip in the longitudinal direction of the cutting edge is in contact with the contact plate. It is characterized by having a cutting portion for cutting.

According to the present invention, the unvulcanized rubber strip is sandwiched between the first holding plate and the second holding plate, and the tip of the cutting edge of the cutter is linearly moved while being brought into contact with the contact plate. The rubber band was cut.
Therefore, the force applied to the unvulcanized rubber strip from the cutting edge of the cutter is firmly received by the contact plate, and the deformation of the cut surface of the unvulcanized rubber strip due to the strong adhesiveness of the unvulcanized rubber is suppressed. , The unvulcanized rubber strip can be smoothly cut, which is advantageous in obtaining a flat cut surface.
In addition, the cutting edge of the cutter is heated, and when cutting the unvulcanized rubber strip, the preheating of the cutting edge of the cutter is used to soften the unvulcanized rubber strip by heat and cut it. The resistance caused by the adhesiveness of the acting unvulcanized rubber strip is reduced, and as a result, the unvulcanized rubber strip having strong adhesiveness can be smoothly cut, which is advantageous in obtaining a flat cut surface. Become.
In addition, the unvulcanized rubber strip is cut in a cutting posture in which the cutting edge is tilted so that the cutting edge is positioned in front of the traveling direction as the cutter moves away from the tip in the longitudinal direction of the cutting edge, so that it has strong adhesiveness. The unvulcanized rubber strip having the above can be smoothly cut, which is advantageous in obtaining a flat cut surface.

It is explanatory drawing which shows the state which the unvulcanized rubber strip is carried in the cutting apparatus of the unvulcanized rubber strip which concerns on embodiment. It is the A arrow view of FIG. It is explanatory drawing which shows the state which the unvulcanized rubber strip is sandwiched in the cutting apparatus of the unvulcanized rubber strip which concerns on embodiment. It is explanatory drawing which shows the state just before cutting the unvulcanized rubber strip by the cutter in the cutting posture in the cutting apparatus of the unvulcanized rubber strip which concerns on embodiment. It is the A arrow view of FIG. It is explanatory drawing which shows the state which the cutter reached the cutting completion position, and the cutting of the unvulcanized rubber strip is completed in the cutting apparatus of the unvulcanized rubber strip which concerns on embodiment. It is a top view of the 1st holding plate. It is a top view of the 2nd holding plate. It is explanatory drawing which saw the state which cut the unvulcanized rubber strip by a cutter from the thickness direction of a cutter. It is explanatory drawing which looked at the state of cutting an unvulcanized rubber strip by a cutter from the front in the traveling direction of a cutter.

Next, the cutting method of the present invention will be described together with the cutting device with reference to the drawings.
In this embodiment, a case of cutting an unvulcanized rubber strip wound around a molding drum for molding a cylindrical rubber product such as a fender is described.
In this embodiment, a case where the unvulcanized rubber strip is cut in a direction orthogonal to the direction intersecting the longitudinal direction thereof will be described.
As shown in FIGS. 1 and 2, the cutting device 12 includes a holding portion 14, a cutting portion 16, and a heating portion 18, and in the present embodiment, the unvulcanized rubber strip 20 is from above to below. It is conveyed to the cutting section 16 and cut at a predetermined length.

The sandwiching portion 14 is a portion for sandwiching the unvulcanized rubber strip 20 from both sides in the thickness direction of the unvulcanized rubber strip 20, and in the present embodiment, the unvulcanized rubber strip 20 is sandwiched in the thickness direction of the unvulcanized rubber strip 20. The unvulcanized rubber strip 20 is sandwiched from both sides in the horizontal direction.
The sandwiching portion 14 includes a first sandwiching plate 22 and a second sandwiching plate 24.
The first holding plate 22 is arranged on one surface side of the unvulcanized rubber strip 20 in the thickness direction, and the first holding plate 22 has an unvulcanized rubber strip 22 as shown in FIGS. 1 and 7. In the present embodiment, which extends in a direction intersecting the longitudinal direction of the body 20, a cutter insertion groove 2202 extending in the width direction perpendicular to the longitudinal direction of the unvulcanized rubber strip 20 is formed. There is.

The second holding plate 24 is arranged on the other surface side of the unvulcanized rubber strip 20 in the thickness direction, and the second holding plate 24 has a cutting edge 2802 of the cutter 28 as shown in FIGS. 1 and 8. A contact plate 25 having a surface having the same hardness as that of the cutter insertion groove 2202 extends in the same extending direction and is detachably provided.
The surface of the contact plate 25 is located on the same surface as the surface of the second holding plate 24.
As the contact plate 25, various conventionally known materials having a low coefficient of friction and being hard to wear when the tip 2804 of the cutting edge 2802 of the cutter 28 touches and moves can be used. In this embodiment, S45C can be used. Carbon steel such as the above is used, and the surface is subjected to salt bath soft nitriding treatment to increase the surface hardness.
The hardness of the contact plate 25 is almost the same as that of the cutting edge 2802 of the cutter 28, and is designed to suppress wear of both the contact plate 25 and the cutting edge 2802.

The first holding plate 22 is immovably fixed and arranged on the frame 1202 of the cutting device 12 with respect to the transport paths extending above and below the unvulcanized rubber strip 20.
The second holding plate 24 is connected to the holding actuator, and in the present embodiment, the air cylinder 26 is used as the holding actuator.
The second holding plate 24 is moved in a direction away from and closer to the first holding plate 22 by the air cylinder 26, and more specifically, the unvulcanized rubber strip 20 is held in cooperation with the first holding plate 22. The reciprocating linear movement is performed between the pinching position P1 (see FIGS. 3 and 4) and the retracting position P2 (see FIG. 1) away from the unvulcanized rubber strip 20.
In the present embodiment, the position of the first holding plate 22, which is one of the pair of holding plates 22 and 24, cannot be moved with respect to the thickness direction of the unvulcanized rubber strip 16. When the unvulcanized rubber strip 20 having strong adhesiveness is cut into a plurality of sheets, a uniform flat surface can be obtained as a cut surface.

As shown in FIGS. 1 and 2, the cutting portion 16 includes a cutter 28, a cutter holder 30, a cutter swinging actuator, a bracket 34, and a cutter moving actuator.
In this embodiment, the air cylinder 32 is used as the actuator for swinging the cutter, and the rodless cylinder 36 is used as the actuator for moving the cutter. The rodless cylinder 36 includes a cylinder tube 3604 that forms the main body of the cutter moving actuator supported by the frame 1202 of the cutting device 12, and a slide table 3602 that forms the moving part of the cutter moving actuator that moves linearly with respect to the main body. And have.
The cutter 28 includes a main body plate portion 2801 having a plate shape, and a cutting edge 2802 formed at an end portion of the main body plate portion 2801 and extending linearly.
As the cutter 28, various conventionally known materials such as SK material (carbon tool steel) and SKD material (alloy tool steel) can be adopted.
As shown in FIG. 9, the cutting edge 2802 extends linearly with a length larger than the thickness of the unvulcanized rubber strip 20 to be cut.
As shown in FIG. 2, the main body plate portion 2801 is held by the cutter holder 30, and the cutter holder 30 is swingably supported by the slide table 3602 of the rodless cylinder 36 via the first support shaft 38A. The cylinder tube 3604 of the rodless cylinder 36 is immovably fixed and arranged on the frame 1202 of the cutting device 12.
The bracket 34 is swingably supported at a position of the slide table 3602 separated from the first support shaft 38A via the second support shaft 38B.

The air cylinder 32 includes a cylinder body 3202 and a piston rod 3204, the cylinder body 3202 is attached to a bracket 34, and the tip of the piston rod 3204 is connected to the cutter holder 30 via a shaft 38C.
As shown in FIG. 2, the cutter 28 is in a heating posture in which the portion of the cutting edge 2802 of the cutter 28 is heated in the reduced state of the air cylinder 32, and as shown in FIG. 5, the cutter 28 is in the extended state of the air cylinder 32. The cutting posture is such that the unvulcanized rubber strip 20 is cut by the cutting edge 2802.
In the cutting posture, the cutter 28 is in a state in which the cutting edge 2802 is tilted so that the cutting edge 2802 is located in front of the traveling direction F as the cutting edge 2802 moves away from the tip 2804 in the longitudinal direction.
Further, when the cutter 28 in the cutting posture is viewed from the front in the moving direction of the cutter 28 when cutting the unvulcanized rubber strip 20, as shown in FIG. 10, the longitudinal direction of the cutting edge 2802 is the holding portion 14. It passes through the center of the unvulcanized rubber strip 20 in the thickness direction and intersects the center line extending in the longitudinal direction of the unvulcanized rubber strip 20 with a sharp angle θ.

The rodless cylinder 36 moves the slide table 3602 linearly along the cylinder tube 3604 by supplying and discharging air to the cylinder tube 3604, whereby the cutter 28 is moved in the cutter insertion groove 2202 and the extending direction of the cutter insertion groove 2202. It is a reciprocating straight line movement on the extension line of.
In the present embodiment, the unvulcanized rubber strip 20 is vertically oriented when the unvulcanized rubber strip 20 is cut so that the cut surface of the adhesive unvulcanized rubber strip 20 tends to be a flat surface. The cutter 28 is moved back and forth in a straight line in the horizontal direction.
The cutter 28 reaches the cutting completion position P11 (see FIG. 6) at the position where the cutting edge 2802 passes from one end to the other end of the unvulverized rubber strip 20 sandwiched between the holding portions 14 in the width direction. In the embodiment, the cutter 28 is linearly moved from the heating position P10 (see FIG. 2) heated by the heating portion 18 to the cutting completion position P11 via the sandwiching portion 14 by the rodless cylinder 36, and after the cutting is completed, the cutter 28 is linearly moved. It is linearly moved from the cutting completion position P11 to the heating position P10, that is, reciprocating linearly between the heating position P10 and the cutting completion position P11.

As shown in FIG. 2, the heating portion 18 is provided at a portion distant from the portion where the unvulcanized rubber strip 20 is to be cut, and is attached to the longitudinal end portion of the cylinder tube 3604.
In the present embodiment, the heating unit 18 is configured such that a pair of plate heaters 1802 having a sheathed heater built in a copper plate are opposed to each other, and a cutter 28 is sandwiched between the plate heaters 1802. The cutter 28 is heated to about 100 ° C. from both sides in the thickness direction. In FIGS. 2, 5, and 6, one of the pair of plate heaters 1802 is not shown.
The heating unit 18 heats the entire length portion of the cutting edge 2802 used at the time of cutting from the longitudinal tip 2804 of the cutting edge 2802 extending linearly of the cutter 28.

Next, a case where the unvulcanized rubber strip 20 is cut by the cutting device 12 will be described.
As shown in FIGS. 1 and 2, the unvulcanized rubber strip 20 has a thickness, a width larger than the thickness, and a length larger than the width, and the length thereof is increased by a transfer mechanism (not shown) in the transfer step. It is conveyed to the cutting device 12 from above via a pair of guides 40 along the direction.
At the time of this transfer step, the cutter 28 is in the heating position P10 by the rodless cylinder 36, and is in the heating posture due to the reduced state of the air cylinder 32, and is heated by the heating unit 18.
When the portion to be cut extending linearly in the width direction of the unvulcanized rubber strip 20 reaches the cutter insertion groove 2202, a transport stop step of stopping the transport of the unvulcanized rubber strip 20 is performed. Be vulcanized.

When the transport of the unvulcanized rubber strip 20 is stopped, as shown in FIG. 3, the second holding plate 24 is set to the holding position P1 by the air cylinder 26, and the first holding plate 22 and the second holding plate 24 are arranged. The sandwiching step of sandwiching the unvulcanized rubber strip 20 from both sides in the thickness direction is performed.
When the pinching step is performed, the cutter 28 is swung from the heating posture to the cutting posture by the air cylinder 32 as shown in FIG.
Subsequently, the cutter 28 reaches the holding portion 14 from the heating position P10 shown in FIG. 5 by the rodless cylinder 36, and as shown in FIGS. 9 and 10, the tip of the cutting edge 2802 of the cutter 28 is in the cutter insertion groove 2202. While the 2804 is brought into contact with the surface of the contact plate 25, it is linearly moved to the cutting completion position P11 shown in FIG. 6, and the unvulcanized rubber strip 20 is cut.

When the cutting of the unvulcanized rubber strip 20 is completed, the unvulcanized rubber strip 20 has a strong adhesiveness, so that the cut portion of the unvulcanized rubber strip 20 is appropriately moved downward by a moving means. Force to move. As the moving means, various conventionally known means such as sandwiching the cut portion of the unvulcanized rubber strip 20 and moving it downward can be adopted.
Further, when the cutting of the unvulverized rubber strip 20 is completed, the cutter 28 is linearly moved from the cutting completion position P11 shown in FIG. 6 to the heating position P10 shown in FIG. 5 by the rodless cylinder 36, and the air is moved. The cutter 28 is swung from the cutting posture to the heating posture shown in FIG. 2 by the cylinder 32, and is heated again by the heating unit 18.
Further, the second holding plate 24 returns from the holding position P1 to the retracted position P2, and the transporting step of the unvulcanized rubber strip 20 by the transport mechanism is performed.
Then, the above-mentioned operation is repeated, and the unvulcanized rubber strip 20 is cut by the cutting device 12 at regular length intervals.

According to the present embodiment, in a state where the unvulcanized rubber strip 20 is sandwiched between the first holding plate 22 and the second holding plate 24, the tip 2804 of the cutting edge 2802 of the cutter 28 is held by the second holding plate 24. The unvulcanized rubber strip 20 was cut by moving it linearly while making contact with the contact plate 25 located on the same surface as the surface.
Therefore, the force applied to the unvulcanized rubber strip 20 from the cutting edge 2802 of the cutter 28 is firmly received by the contact plate 25, so that the cut surface of the unvulcanized rubber strip 20 due to the strong adhesiveness of the unvulcanized rubber. Deformation is suppressed, the unvulcanized rubber strip 20 can be smoothly cut, which is advantageous in obtaining a flat cut surface.
Further, since the cutting edge 2802 of the cutter 28 and the surface of the contact plate 25 have the same hardness, it is advantageous in reducing the friction between the tip 2804 of the cutting edge 2802 of the cutter 28 and the contact plate 25. The moving speed of the cutter 28 can be increased, which is advantageous in shortening the time required for cutting the unvulcanized rubber strip 20 by the cutting device 12.

Further, the cutting edge 2802 of the cutter 28 is heated by the heating unit 18, and when the unvulcanized rubber strip 20 is cut, the unvulcanized rubber strip 20 is softened by heat by utilizing the preheating of the cutting edge 2802 of the cutter 28. Therefore, the resistance caused by the adhesiveness of the unvulcanized rubber strip 20 acting on the cutter 28 is reduced, and as a result, the unvulcanized rubber strip 20 having strong adhesiveness is smoothly cut. This is advantageous in obtaining a flat cut surface.
Further, since the preheating of the cutting edge 2802 of the cutter 28 is used to separate the cutter 28 from the heating unit 18, the electrical wiring and the heating unit are compared with the case where the cutter 28 integrated with the heating unit 18 is moved. 18 does not move with the cutter 28, only the cutter 28 moves. Therefore, the cutter 28 can be moved in a narrow space, and since only the cutter 28 is moved, the moving target becomes lightweight, which is advantageous in moving the cutter 28 quickly.
Further, since the heating of the cutter 28 by the heating unit 18 is limited to the entire length portion of the cutting edge 2802 used at the time of cutting from the tip in the longitudinal direction of the cutting edge 2802 extending linearly of the cutter 28, the main body plate of the cutter 28 is used. Unnecessary heating to parts that do not contribute to cutting of the unvulcanized rubber strip 20 such as part 2801 is suppressed.
Therefore, since the cutter 28 can be heated in a short time by the heating unit 18, it is advantageous in shortening the time required for cutting the unvulcanized rubber strip 20 by the cutting device 12, and many cuttings are performed in a short time. It is advantageous in obtaining the unvulcanized rubber strip 20.
Further, since the cutter 28 is swung and linearly moved after being heated by the heating portion, the preheating of the cutter 28 can be maintained at a high temperature until the unvulcanized rubber strip 20 is cut, and the unvulcanized rubber strip 20 can be maintained. It is advantageous for efficiently cutting the body 20.

Further, the unvulcanized rubber strip 20 is cut in a cutting posture in which the cutting edge 2802 is tilted so that the cutting edge 2802 is located in front of the traveling direction F as the cutter 28 moves away from the tip 2804 in the longitudinal direction of the cutting edge 2802. Therefore, the unvulcanized rubber strip 20 having strong adhesiveness can be smoothly cut, which is advantageous in obtaining a flat cut surface.

12 Cutting device 14 Holding part 16 Cutting part 18 Heating part 20 Unvulcanized rubber strip 22 First holding plate 2202 Cutter insertion groove 24 Second holding plate 25 Contact plate 28 Cutter 2802 Cutting edge 2804 Tip 32 Air cylinder (actuator for rocking)
36 Rodless cylinder (actuator for moving cutter)
F Travel direction P1 Holding position P2 Evacuation position P10 Heating position P11 Cutting completion position

Claims (8)

It is a cutting method of an unvulcanized rubber strip by cutting an unvulcanized rubber strip with a cutting edge extending linearly of a cutter.
A first holding plate having a cutter insertion groove extending in a direction intersecting the longitudinal direction of the unvulcanized rubber strip, and a first holding plate.
A second holding plate in which a contact plate having a surface having a surface having a hardness equivalent to that of the cutting edge extends in the same extending direction as the cutter insertion groove is arranged.
A heating portion for heating the entire length of the cutting edge used at the time of cutting is provided from the tip in the longitudinal direction of the cutting edge of the cutter at a position away from the portion where the unvulcanized rubber strip is cut by the cutter.
The cutter is heated by the heating unit, and the cutter is heated by the heating unit.
The unvulcanized rubber strip is sandwiched between the first holding plate and the second holding plate from both sides in the thickness direction.
The heated cutter is separated from the heating portion, and the cutter is placed in a cutting posture in which the cutting edge is tilted so that the cutting edge is positioned forward in the traveling direction as the cutting edge is separated from the tip in the longitudinal direction.
While the longitudinal tip of the cutting edge of the cutter, which is heated by the heating portion and has residual heat, is brought into contact with the surface of the contact plate, the cutter is moved in the cutter insertion groove along the extending direction of the cutter insertion groove. The unvulcanized rubber strip is cut by moving it linearly.
A method for cutting an unvulcanized rubber strip made of unvulcanized rubber. When the cutter in the cutting posture is viewed from the front in the moving direction of the cutter, the longitudinal direction of the cutting edge passes through the center in the thickness direction of the unvulcanized rubber strip sandwiched by the sandwiching portion and is not. It intersects the center line extending in the longitudinal direction of the vulcanized rubber strip at a sharp angle.
The method for cutting an unvulcanized rubber strip made of unvulcanized rubber according to claim 1. The surface of the contact plate and the surface of the second holding plate are located on the same surface.
The method for cutting an unvulcanized rubber strip made of unvulcanized rubber according to claim 1 or 2. A cutting device that cuts an unvulcanized rubber strip with a cutting edge that extends linearly in the cutter in a direction that intersects its longitudinal direction.
The first holding plate having a cutter insertion groove extending in a direction intersecting the longitudinal direction of the unvulcanized rubber strip and the contact plate having a surface having a surface having the same hardness as the cutting edge extend in the same manner as the cutter insertion groove. A holding portion that enables the unvulcanized rubber strip to be sandwiched from both sides in the thickness direction of the unvulcanized rubber strip with the second holding plate extending in the direction.
A heating portion that heats the entire length portion of the cutting edge used at the time of cutting from the longitudinal tip of the cutting edge of the cutter at a position away from the holding portion.
The heating portion and the holding portion are in a cutting posture tilted so that the cutting edge is positioned forward in the traveling direction as the cutting edge moves away from the tip in the longitudinal direction of the cutting edge with respect to the thickness direction of the unsulfided rubber strip. The cutter is moved on an extension line in the extending direction of the cutter insertion groove, and the unvulverized rubber strip sandwiched by the sandwiching portion in the sandwiching portion is formed by the tip of the cutting edge in the longitudinal direction. A cutting portion that cuts by linearly moving the cutter along the extending direction of the cutter insertion groove in the cutter insertion groove while in contact with the contact plate.
A device for cutting an unvulcanized rubber strip, which comprises. When the cutter in the cutting posture is viewed from the front in the moving direction of the cutter, the longitudinal direction of the cutting edge passes through the center in the thickness direction of the unvulcanized rubber strip sandwiched by the sandwiching portion and is not. It intersects the center line extending in the longitudinal direction of the vulcanized rubber strip at a sharp angle.
The device for cutting an unvulcanized rubber strip according to claim 4. The surface of the contact plate and the surface of the second holding plate are located on the same surface.
The device for cutting an unvulcanized rubber strip made of unvulcanized rubber according to claim 4 or 5. The first holding plate is fixedly fixed and arranged immovably on the frame of the cutting device, and is arranged.
The holding portion moves the second holding plate between a holding position for holding the unvulcanized rubber strip in cooperation with the first holding plate and a retracting position away from the holding position. Consists of an actuator for
The device for cutting an unvulcanized rubber strip according to any one of claims 4 to 6. The cutter reaches the cutting completion position at the position where the cutting edge passes from one end in the width direction of the unvulcanized rubber strip sandwiched between the holding portions to the other end.
The cutting portion includes a cutter moving actuator that reciprocates and linearly moves the cutter in the cutting posture between the heating portion and the cutting completion position, the cutting posture at the heating position, and heating at the heating portion. It is configured to include a swinging actuator that swings the cutter to and from the heating posture.
The device for cutting an unvulcanized rubber strip according to any one of claims 4 to 7.

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