JP7102928B2 - Rubber material cutting device - Google Patents

Description

The present invention relates to a device for cutting rubber materials. In particular, the present invention relates to a rubber material cutting device used in the manufacture of tires.

In the manufacture of tires, for example, a sheet-shaped rubber material (hereinafter referred to as a rubber sheet) is formed by extruding a rubber composition for a sidewall. This rubber sheet is cut to a predetermined length to obtain a plate-shaped rubber material (hereinafter referred to as a rubber plate). In the longitudinal direction, the rubber plate has cut surfaces at both ends thereof.

The rubber plate is wound around the drum of the molding machine. The cut surface at the front end and the cut surface at the rear end are joined, and this rubber plate is processed into a ring shape.

In a rubber plate processed into a ring shape (hereinafter referred to as a rubber ring), a portion where the cut surfaces are joined to each other, that is, a joint portion is peculiar as compared with a portion other than this joint portion. Various studies have been conducted on a rubber sheet cutting device and a cutting method so that the cut surfaces are sufficiently joined to each other and a joining defect does not occur (for example, Patent Document 1).

Patent Document 1 discloses a rubber sheet cutting device. In this cutting device, the rubber sheet is cut while simultaneously moving the cutter blade (hereinafter, also referred to as a cutting tool) in the width direction and the thickness direction of the rubber sheet.

JP-A-2017-2007114

When cutting a rubber sheet, the cutting tool is usually inserted at an angle to the rubber sheet in order to use the cut surface as a joint surface. Since the cutting tool moves while in contact with the rubber sheet, fragments of the rubber sheet tend to adhere to the back surface of the cutting tool.

When a rubber sheet is cut with a cutting tool to which fragments are attached, unevenness reflecting the shape of the fragments may occur on the cut surface. This fragment may adhere to the cut surface in the next cutting, and even in this case, the cut surface becomes uneven.

To facilitate cutting of the rubber sheet, the cutting tool may be heated by a heating means such as a heater. In this case, when a piece adheres to the cutting tool, heat is taken away by the piece and the temperature of the cutting tool drops. When the rubber sheet is cut with a cutting tool whose temperature has decreased, the cut surface becomes rough and the cut surface becomes uneven.

If the cut surfaces are uneven, the cut surfaces cannot be sufficiently brought into close contact with each other, and a good joint state cannot be obtained. For this reason, the cutting tool is cleaned regularly, specifically once every two days. The frequency of cleaning affects productivity.

Fragments may stick to the cutting tool. In this case, a tool such as a spatula is used to scrape the debris off the cutting tool. However, cleaning with a tool can damage the cutting tool. Fragments tend to adhere to scratched cutting tools. Cleaning with a tool may reduce the useful life of the cutting tool. The reality is that the cutting tool of the cutting device is replaced with a new cutting tool once every two weeks.

If it is possible to suppress the adhesion of fragments to the cutting tool, it is possible to obtain a cut surface without unevenness. In this case, since the frequency of cleaning can be reduced, improvement in productivity can be expected. Since cleaning with a tool is not required, the cutting tool is not easily scratched. If the adhesion of fragments to the cutting tool can be suppressed, the useful life of the cutting tool can be expected to increase.

The present invention has been made in view of such an actual situation, and an object of the present invention is to provide a rubber material cutting device capable of suppressing adhesion of fragments of the rubber material when cutting a sheet-shaped rubber material. There is.

The rubber material cutting device according to the present invention is a rubber material cutting device that cuts a rubber material while moving a cutting tool in the width direction and the length direction by a moving means.
In this rubber material cutting device, the cutting tool includes a blade portion for cutting the rubber material, the blade portion is a single-edged blade having a blade on the front surface, and the back surface of the blade portion has a recess.

Preferably, the rubber material cutting device includes a lateral edge in which the recess extends in the width direction, and the lateral edge is provided at a position at least 10 mm inward in the length direction from the tip of the blade portion.

Preferably, the rubber material cutting device includes a vertical edge in which the recess extends in the length direction, and the vertical edge is provided at a position at least 10 mm inward in the width direction from the side end of the blade portion.

Preferably, in this rubber material cutting device, the angle formed by the front surface of the cutting edge of the cutting edge with respect to the back surface is 8 ° or more and 12 ° or less.

Preferably, in this rubber material cutting device, the length of the blade portion is 90 mm or more and 110 mm or less.

Preferably, in this rubber material cutting device, the approach angle of the blade portion to the rubber material is 15 ° or more and 30 ° or less.

Preferably, in the rubber material cutting device, the moving means includes a heating means for heating the cutting tool, and the temperature of the cutting edge of the cutting tool is at least 170 ° C. in the cutting tool heated by the heating means. ..

Preferably, in this rubber material cutting device, the cutting tool is simultaneously moved in the width direction and the length direction by the moving means.

In the rubber material cutting device according to the present invention, a recess is provided on the back surface of the blade portion of the cutting tool. This recessed portion does not come into contact with the rubber material when cutting the rubber material. Since it is not the entire back surface that comes into contact with the rubber material, but a part of the back surface, fragments of the rubber material do not easily adhere to the back surface of the blade. In this cutting device, when cutting a sheet-shaped rubber material, adhesion of fragments of the rubber material is suppressed.

In this cutting device, since the adhesion of fragments to the blade portion is suppressed, when the rubber material is cut using this cutting tool, a cut surface without unevenness can be obtained. Since the frequency of cleaning can be reduced, this cutting device can be expected to improve productivity. Since cleaning with a tool is not required, the cutting tool is not easily scratched. Therefore, this cutting device can increase the service life of the cutting tool.

FIG. 1 is a perspective view showing an outline of a rubber material cutting device according to an embodiment of the present invention. FIG. 2 is a diagram showing an outline of a cutting portion of the cutting device of FIG. FIG. 3 is a view showing the surface of the cutting tool. FIG. 4 is a diagram showing a cross section taken along the line aa of FIG. FIG. 5 is a view showing the back surface of the cutting tool of FIG. FIG. 6 is a diagram illustrating a procedure for cutting a rubber material.

Hereinafter, the present invention will be described in detail based on preferred embodiments with reference to the drawings as appropriate.

FIG. 1 shows an outline of a cutting device 2 according to an embodiment of the present invention. This cutting device 2 cuts the rubber material G. Specifically, in this cutting device 2, the sheet-shaped rubber material G (hereinafter, referred to as rubber sheet G) used for manufacturing a tire is cut. As a result, a plate-shaped rubber material (hereinafter referred to as a rubber plate) as a component such as a sidewall and an apex can be obtained. In FIG. 1, the direction of the arrow M is the moving direction of the rubber sheet G.

Although not described in detail, the rubber sheet G to be cut by the cutting device 2 is obtained by extruding the unvulcanized rubber composition in an extruder (not shown). The rubber sheet G is long.

[Cutting device 2]
The cutting device 2 includes a cutting portion 4. The cutting portion 4 includes a cutting tool 6 and a moving means 8. The cutting tool 6 is a member that cuts the rubber sheet G. In the cutting device 2, the cutting tool 6 is moved in the width direction of the cutting tool 6 by the moving means 8. The cutting tool 6 is also moved in the length direction of the cutting tool 6 by the moving means 8. In this cutting device 2, the rubber sheet G is cut while the cutting tool 6 is moved in the width direction and the length direction by the moving means 8.

FIG. 2 shows an outline of the cutting portion 4. The rubber sheet G moves from the upper side to the lower side of the paper surface. The lower side of the paper surface is the front side of the cutting device 2, and the upper side of the paper surface is the rear side of the cutting device 2. In FIG. 2, the left-right direction is the width direction of the cutting tool 6. The width direction of the cutting tool 6 corresponds to the width direction of the rubber sheet G. The vertical direction is the length direction of the cutting tool 6. The length direction of the cutting tool 6 corresponds to the length direction of the rubber sheet G.

As described above, the cutting portion 4 includes a cutting tool 6 and a moving means 8. The moving means 8 includes a holder 10, a horizontal moving means 12, and a vertical moving means 14.

The holder 10 supports the cutting tool 6. The holder 10 includes a fixing portion 16 for fixing the cutting tool 6, and a supporting portion 18 extending rearward from the fixing portion 16.

The lateral moving means 12 moves the cutting tool 6 in the width direction of the cutting tool 6. The lateral moving means 12 includes a transverse shaft 20, a transverse nut 22, and a transverse motor 24.

The transverse axis 20 extends in the width direction of the cutting tool 6. One end of the traverse shaft 20 is supported by a bearing 26. The other end of the traversing shaft 20 is connected to a rotating shaft (not shown) of the traversing motor 24. By driving the traversing motor 24 and rotating the rotating shaft, the traversing shaft 20 is rotated.

In this cutting device 2, a screw (not shown) is engraved on the traverse shaft 20 and the traverse nut 22, and the traverse shaft 20 is screwed into the traverse nut 22. In the lateral moving means 12, the transverse nut 22 moves in the width direction due to the rotation of the transverse axis 20. In this cutting device 2, the transverse nut 22 is attached to the support portion 18 of the holder 10, specifically, the rear portion of the support portion 18. Therefore, as the transverse nut 22 moves in the width direction, the holder 10 moves in the width direction. As described above, the holder 10 supports the cutting tool 6. In the cutting device 2, the cutting tool 6 is moved in the width direction by the lateral moving means 12.

The vertical moving means 14 moves the cutting tool 6 in the length direction of the cutting tool 6. The vertical moving means 14 includes a vertical shaft 28, a vertical nut 30, a vertical motor 32, and a vertical plate 34.

The longitudinal axis 28 extends in the length direction of the cutting tool 6. One end of the longitudinal shaft 28 is supported by a bearing 26. The other end of the longitudinal shaft 28 is connected to a rotating shaft (not shown) of the longitudinal motor 32. By driving the longitudinal motor 32 and rotating the rotating shaft, the longitudinal shaft 28 is rotated.

In this cutting device 2, a screw (not shown) is engraved on the vertical shaft 28 and the vertical nut 30, and the vertical shaft 28 is screwed into the vertical nut 30. In the vertical moving means 14, the vertical nut 30 moves in the longitudinal direction by rotating the vertical shaft 28.

In this cutting device 2, a vertical nut 30 is attached to the vertical plate 34. The portions on both sides of the vertical plate 34 in the width direction are fitted to the vertical rail 36, respectively. In the vertical movement means 14, the vertical plate 34 moves in the length direction by moving the vertical nut 30 in the length direction.

In this cutting device 2, the transverse motor 24 and the bearing 26 of the transverse movement means 12 are fixed to the longitudinal plate 34. The transverse nut 22 of the transverse movement means 12 is supported by the longitudinal plate 34 via the transverse axis 20. As described above, the transverse nut 22 is attached to the holder 10 that supports the cutting tool 6. Therefore, in the cutting device 2, the cutting tool 6 is moved in the length direction by the vertical moving means 14.

Although not shown, the cutting device 2 includes a control unit. This control unit controls the operations of the lateral moving means 12 and the vertical moving means 14. In other words, in the cutting device 2, the cutting tool 6 is moved in the width direction and the length direction by controlling the operations of the lateral moving means 12 and the vertical moving means 14 by the control unit. Examples of such control means include programmable sequencers, microcomputers, personal computers, and other control devices.

The cutting device 2 includes a holding portion 38. The pressing portion 38 includes a pressing plate 40. The pressing plate 40 is a leaf spring. As shown in FIG. 1, the cutting device 2 includes five pressing plates 40 arranged in parallel in the width direction. The cutting device 2 is configured such that the rubber sheet G is pressed against the mounting table 42 by five pressing plates 40.

[Cutting tool 6]
FIG. 3 shows a cutting tool 6. As described above, the cutting tool 6 cuts the rubber material G. In this cutting device 2, the cutting tool 6 has a plate shape. The thickness of the cutting tool 6 indicated by the double-headed arrow T in FIG. 4 is usually set appropriately in the range of 7 mm or more and 9 mm or less.

The cutting tool 6 includes a blade portion 44 and a mounting portion 46. In this cutting device 2, the cutting tool 6 cuts the rubber sheet G at the blade portion 44. The blade portion 44 cuts the rubber sheet G. The mounting portion 46 is fixed to the fixing portion 16 of the holder 10.

The blade portion 44 is not a double-edged blade but a single-edged blade. As shown in FIG. 4, in this cutting device 2, a blade is attached to the surface 48 of the blade portion 44. The blade portion 44 is a single-edged blade having a blade attached to the surface 48. In FIG. 3, the reference numeral PE is the tip of the blade portion 44.

In this cutting device 2, the blade portion 44 is composed of a blade edge 50 on the tip PE side and a main body 52 on the mounting portion 46 side. Further, the main body 52 is composed of a first main body 52a on the cutting edge 50 side and a second main body 52b on the mounting portion 46 side. In this cutting device 2, a blade is attached to the surface 48 of the cutting edge 50 and the surface 48 of the first main body 52a.

In FIG. 4, the reference numeral PF is the rear end of the cutting edge 50 on the surface 48 of the cutting edge 44. On the surface 48 of the blade portion 44, the rear end PF of the blade edge 50 is also the tip of the first main body 52a. The double-headed arrow LF is the distance from the tip PE of the cutting edge 50 to the rear end PF. In this cutting device 2, the distance LF from the tip PE of the cutting edge 50 to the rear end PF is appropriately set in the range of 13 mm or more and 17 mm or less.

In FIG. 4, the reference numeral PM is the rear end of the first main body 52a on the surface 48 of the blade portion 44. On the surface 48 of the blade portion 44, the rear end PM of the first main body 52a is also the tip of the second main body 52b. The double-headed arrow LM is the distance from the tip PE of the cutting edge 50 to the rear end PM of the first main body 52a. In this cutting device 2, the distance LM from the tip PE of the cutting edge 50 to the rear end PM of the first main body 52a is appropriately set in the range of 60 mm or more and 70 mm or less.

In this cutting device 2, the inclination of the front surface 48 with respect to the back surface 54 is slightly different between the cutting edge 50 and the first main body 52a. Specifically, in this cutting device 2, the inclination of the surface 48 on the first main body 52a is gentler than the inclination of the surface 48 on the cutting edge 50.

As shown in FIG. 5, in this cutting device 2, a recess 56 is provided on the back surface 54 of the blade portion 44. In other words, there is a recess 56 on the back surface 54 of the blade portion 44.

In FIG. 4, the distance represented by the double-headed arrow t is the depth of the depression 56. In this cutting device 2, the depth t of the recess 56 is appropriately set in the range of 2 mm or more and 4 mm or less. In the cutting device 2, the bottom 58 of the recess 56 is composed of a bottom surface 58a extending along the back surface 54 and a slope 58b connecting the bottom surface 58a and the back surface 54.

In this cutting device 2, the recess 56 has a rectangular shape. The recess 56 includes a pair of horizontal edges 60 extending in the width direction of the cutting tool 6 and a pair of vertical edges 62 extending in the length direction of the cutting tool 6.

The horizontal edge 60a on the tip PE side is located inside in the length direction with respect to the tip PE. In the cutting device 2, the horizontal edge 60a on the tip PE side is also the boundary between the slope 58b of the recess 56 and the back surface 54. The horizontal edge 60b on the side of the mounting portion 46 is located inside the mounting portion 46 in the length direction. On the mounting portion 46 side, the corner portion composed of the horizontal edge 60b and the vertical edge 62 is rounded.

The left and right vertical edges 62 are located inside the side ends 64 of the blade portion 44 in the width direction, respectively. As shown in FIG. 5, in this cutting device 2, the width direction distance from the right side end 64a to the vertical edge 62a is longer than the width direction distance from the left side end 64b to the vertical edge 62b. The width direction distance from the right side edge 64a to the vertical edge 62a may be shorter than the width direction distance from the left side edge 64b to the vertical edge 62b, or the width direction from the right side edge 64a to the vertical edge 62a. The distance and the widthwise distance from the left side edge 64b to the vertical edge 62b may be the same.

[Attachment of cutting tool 6]
As described above, in the cutting device 2, the cutting tool 6 is attached to the holder 10 of the moving means 8. In this cutting device 2, the cutting tool 6 is attached to the holder 10 so that the back surface 54 is located behind the front surface 48. As shown in FIG. 6, in this cutting device 2, the direction of the blade portion 44 is adjusted by an angle adjusting means (not shown) so that the blade portion 44 enters the rubber sheet G at an angle. As a result, the cutting tool 6 is set in the moving means 8 so that the back surface 54 faces the rubber sheet G.

In FIG. 6, the alternate long and short dash line DL is the approach direction of the blade portion 44. This approach direction coincides with the length direction of the cutting tool 6. The angle θ is an angle formed by the approach direction of the blade portion 44 with respect to the moving direction of the rubber sheet G. In this cutting device 2, this angle θ is the approach angle of the blade portion 44 to the rubber material G.

[Cut of rubber sheet G by cutting device 2]
In this cutting device 2, the rubber sheet G is cut as follows. In the cutting method using the cutting device 2, the orientation of the blade portion 44 of the cutting tool 6 is adjusted. Specifically, the approach angle θ of the blade portion 44 into the rubber material G is adjusted so that the blade portion 44 enters the rubber sheet G in a predetermined direction.

In this cutting method, the rubber sheet G formed in the extruder is supplied to the cutting device 2 from the rear side. The rubber sheet G is moved on the mounting table 42 of the cutting device 2 from the rear side to the front side by a conveying means (not shown).

In this cutting method, when the moving distance of the rubber sheet G reaches a preset distance, the movement of the rubber sheet G is stopped. After stopping, as shown in FIG. 6, the pressing plate 40 of the pressing portion 38 presses the rubber sheet G against the mounting table 42. As a result, the position shift of the rubber sheet G with respect to the mounting table 42 is prevented.

In this cutting method, when the rubber sheet G is fixed at a predetermined position by the pressing plate 40, the cutting tool 6 is moved by the moving means 8. As a result, the blade portion 44 can be made to enter the rubber sheet G. The rubber sheet G is cut to obtain a rubber plate. In this cutting device 2, in order to protect the blade edge 50 of the blade portion 44, a resin cutting board 66, specifically, heat resistance, is placed in a portion of the mounting table 42 where the blade edge 50 of the blade portion 44 is close to. A cutting board 66 made of sex MC nylon is provided. In particular, a groove having a depth of 1 mm to 2 mm is carved in a portion where the cutting edge 50 is likely to come into contact, although not shown.

In this cutting method, the rubber plate obtained by cutting the rubber sheet G is conveyed to the next step by a conveying means (not shown). In the cutting device 2, the restraint of the rubber sheet G by the pressing plate 40 is released, and the production of the next rubber plate is started.

As described above, in the cutting device 2, the recess 56 is provided on the back surface 54 of the blade portion 44 of the cutting tool 6. The portion of the recess 56 does not come into contact with the rubber sheet G when the rubber sheet G is cut. Since the contact with the rubber sheet G is not the entire back surface 54 but a part of the back surface 54, the rubber sheet G is prevented from being worn. In this cutting device 2, the pieces of the rubber sheet G are unlikely to adhere to the back surface 54 of the blade portion 44. In this cutting device 2, when the rubber sheet G, that is, the sheet-shaped rubber material G is cut, the adhesion of fragments of the rubber material G is suppressed.

In this cutting device 2, since the adhesion of fragments to the blade portion 44 is suppressed, when the rubber sheet G is cut using the cutting tool 6, a cut surface having no unevenness can be obtained. Since the frequency of cleaning can be reduced, the cutting device 2 can be expected to improve productivity. Since cleaning with a tool is not required, the cutting tool 6 is not easily scratched. Therefore, the cutting device 2 can increase the useful life of the cutting tool 6.

In this cutting device 2, the cutting tool 6 is made of metal. Examples of the material of the cutting tool 6 include an aluminum alloy and beryllium copper. Beryllium copper is preferable as the material of the cutting tool 6 from the viewpoint of effectively preventing bending of the tip PE of the cutting edge 50.

In this cutting device 2, the blade portion 44 is surface-treated with a surface treatment agent from the viewpoint of suppressing adhesion of fragments of the rubber sheet G to the blade portion 44. In other words, the blade portion 44 has a treated film on its front surface 48 and its back surface 54. Examples of this surface treatment agent include the trade name "Tosical Coating (TS-1080)" manufactured by Toshiko Co., Ltd. and the trade name "Super TP" manufactured by Yoshida SKT Co., Ltd. From the viewpoint of effectively preventing the fragments of the rubber sheet G from adhering to the blade portion 44, the trade name "Super TP" manufactured by Yoshida SKT Co., Ltd. is preferable as this surface treatment agent. In this case, since the adhesion of the fragments is prevented, the temperature drop of the blade portion 44 caused by the adhesion of the fragments to the blade portion 44 is also prevented.

In FIG. 5, the double-headed arrow DY is the distance from the tip PE of the blade portion 44 to the horizontal edge 60a of the recess 56 on the tip PE side. The double-headed arrow LH is the length of the recess 56.

As described above, in the cutting device 2, the lateral edge 60a on the tip PE side is located inside the tip PE in the length direction. Since the strength of the cutting edge 50 is ensured, deformation of the cutting edge 50 is suppressed. This cutting device 2 can stably cut the rubber sheet G while preventing fragments of the rubber sheet G from adhering to the blade portion 44. From this point of view, in this cutting device 2, the recess 56 is provided with a horizontal edge 60a extending in the width direction, and the horizontal edge 60a is provided at a position at least 10 mm inward in the length direction from the tip PE of the blade portion 44. Is preferable. In other words, the distance DY from the tip PE of the blade portion 44 to the horizontal edge 60a on the tip PE side of the recess 56 is preferably 10 mm or more. This distance DY is preferably 20 mm or less from the viewpoint of effectively preventing the adhesion of fragments.

In this cutting device 2, the recess 56 prevents the rubber sheet G from being worn during cutting and suppresses the adhesion of fragments of the rubber sheet G. From the viewpoint that the recess 56 effectively prevents the fragments from adhering to the blade portion 44, the length LH of the recess 56 is preferably 80 mm or more, more preferably 85 mm or more. From the viewpoint of effectively suppressing the influence of the recess 56 on the strength of the blade portion 44, the length LH is preferably 100 mm or less, more preferably 95 mm or less.

As shown in FIG. 5, in this cutting device 2, the horizontal edge 60a on the PE side of the tip of the recess 56 overlaps with the cutting edge 50 in the length direction. In other words, the lateral edge 60a of the recess 56 is located between the tip PE of the cutting edge 50 and the trailing edge PF in the length direction. As a result, it is possible to effectively prevent fragments of the rubber sheet G from adhering to the blade portion 44 while ensuring good sharpness. From this point of view, in this cutting device 2, the lateral edge 60a of the recess 56 on the tip PE side is preferably located between the tip PE of the cutting edge 50 and the trailing end PF in the length direction.

In FIG. 4, the double-headed arrow DT is the distance from the side end 64 of the blade portion 44 to the vertical edge 62 of the recess 56. The double-headed arrow WA is the width of the blade portion 44. The double-headed arrow WH is the width of the recess 56. In this cutting device 2, the width WA of the blade portion 44 is usually set to a width about 100 mm larger than the width of the rubber sheet G to be cut.

As described above, in this cutting device 2, the vertical edge 62 is located inside the side end 64 of the blade portion 44 in the width direction. As a result, the strength of the blade portion 44 is appropriately maintained even though the recess 56 is provided. In this cutting device 2, the rubber sheet G is stably cut while preventing fragments of the rubber sheet G from adhering to the blade portion 44. From this point of view, the cutting device 2 includes a vertical edge 62 in which the recess 56 extends in the length direction, and the vertical edge 62 is provided at a position at least 10 mm inward in the width direction from the side end 64 of the blade portion 44. It is preferable to be. In other words, the distance DT from the side end 64 of the blade portion 44 to the vertical edge 62 of the recess 56 is preferably 10 mm or more. From the viewpoint of effectively preventing the adhesion of fragments, this distance DT is preferably 60 mm or less. In this cutting device 2, the sum of the left and right distance DTs is preferably 20 mm or more, preferably 100 mm or less, from the viewpoint of stably cutting the rubber sheet G while preventing fragments of the rubber sheet G from adhering to the blade portion 44. Is preferable.

In this cutting device 2, the ratio of the width WH of the recess 56 to the width WA of the blade portion 44 is preferably 0.7 or more, and preferably 0.8 or less. By setting this ratio to 0.7 or more, the rubber sheet G is effectively prevented from adhering to the blade portion 44. By setting this ratio to 0.8 or less, the rigidity of the blade portion 44 is appropriately ensured.

As described above, in this cutting device 2, a blade is attached to the surface 48 of the cutting edge 50. That is, at the blade edge 50 of the blade portion 44, the front surface 48 is inclined with respect to the back surface 54. In FIG. 4, α is an angle formed by the front surface 48 with respect to the back surface 54 at the cutting edge 50 of the blade portion 44. This angle α is the inclination angle of the surface 48 at the cutting edge 50. In this cutting device 2, a blade is also attached to the surface 48 of the first main body 52a. That is, also in the first main body 52a, the front surface 48 is inclined with respect to the back surface 54. In FIG. 4, β is an angle formed by the front surface 48 with respect to the back surface 54 in the first main body 52a. This angle β is the inclination angle of the surface 48 on the first main body 52a.

In this cutting device 2, the inclination angle α of the surface 48 on the cutting edge 50 is preferably 8 ° or more, and preferably 12 ° or less. When the inclination angle α is set to 8 ° or more, the blade portion 44 has an appropriate strength. In this cutting device 2, deformation such as bending of the cutting edge 50 is prevented. When the inclination angle α is set to 12 ° or less, the cutting edge 50 exhibits good sharpness. Further, by setting the inclination angle α to 8 ° or more and 12 ° or less, the adhesion of fragments to the blade portion 44 can be effectively suppressed.

As described above, in this cutting device 2, the inclination of the surface 48 on the first main body 52a is gentler than the inclination of the surface 48 on the cutting edge 50. In other words, the inclination angle β of the surface 48 on the first main body 52a is smaller than the inclination angle α of the surface 48 on the cutting edge 50. In this cutting device 2, the adhesion between the blade portion 44 and the rubber sheet G is appropriately suppressed, so that the fragments of the rubber sheet G are more effectively suppressed from adhering to the blade portion 44. From this point of view, in this cutting device 2, the inclination angle β is preferably smaller than the inclination angle α. Specifically, the difference from the inclination angle α and the inclination angle β is preferably 3 ° or more, and preferably 5 ° or less.

In FIG. 6, the double-headed arrow LK is the length of the blade portion 44. From the viewpoint that the blade edge 50 has good sharpness and the blade portion 44 has appropriate strength, the length LK of the blade portion 44 is preferably 90 mm or more, preferably 110 mm or less in this cutting device 2.

As shown in FIG. 6, in this cutting device 2, the blade portion 44 is obliquely entered into the rubber sheet G. As a result, in the rubber plate obtained by cutting, a cut surface that also serves as a joint surface is sufficiently secured. In this cutting device 2, the approach angle θ of the blade portion 44 to the rubber sheet G is preferably 15 ° or more from the viewpoint of stably forming the cut surface. From the viewpoint of ensuring a sufficiently large cut surface, the approach angle θ is preferably 35 ° or less.

The cutting device 2 includes a heating means 68 for heating the cutting tool 6 in order to smoothly cut the rubber sheet G. In this cutting device 2, as shown in FIGS. 1 and 2, a heating means 68 is provided on the holder 10, particularly on the outer portion (hereinafter, referred to as a side portion) in the width direction of the fixing portion 16. The cutting device 2 includes a pair of heating means 68, and each heating means 68 is provided on a side portion of the fixing portion 16. In this cutting device 2, the heating means 68 is set between the side portion (that is, the fixing portion 16) and the attachment portion 46 of the cutting tool 6.

In this cutting device 2, the heating means 68 is not particularly limited as long as the cutting edge 50 can be sufficiently heated. Examples of the heating means 68 include an electric heater. From the viewpoint that the cutting edge 50 exhibits good sharpness, in this cutting device 2, the temperature of the cutting tool 6 heated by the heating means 68 is preferably at least 170 ° C. From the viewpoint of suppressing deterioration of the cut surface (for example, rubber burning), the temperature of the cutting edge 50 is preferably 180 ° C. at most.

In this cutting device 2, the rubber sheet G is cut while the cutting tool 6 is moved in the width direction and the length direction by the moving means 8. The cutting device 2 can cut the rubber sheet G while alternately moving the cutting tool 6, that is, the cutting edge 50, in the width direction and the length direction. The cutting device 2 can also cut the rubber sheet G while simultaneously moving the cutting edge 50 in the width direction and the length direction. In particular, when the rubber sheet G is cut while moving the cutting edge 50 at the same time in the width direction and the length direction, friction with the rubber sheet G at the time of cutting is effectively suppressed. In this cutting device 2, the rubber sheet G is used from the viewpoint that the recess 56 provided on the back surface 54 of the blade portion 44 prevents the pieces of the rubber sheet G from adhering to the blade portion 44 more effectively. When cutting, it is preferable that the cutting tool 6 is simultaneously moved in the width direction and the length direction by the moving means 8.

It has been confirmed that the cutting device 2 can cut the rubber sheet G for 2 months or more (80,000 times or more as the number of cuttings) without replacing the cutting tool 6. Considering that the rubber material G is cut while changing the cutting tool once every two weeks in the conventional cutting device, the cutting device 2 of the present invention is remarkable as compared with the conventional cutting device. It is clear that it works.

As is clear from the above description, according to the present invention, when cutting the sheet-shaped rubber material G, the rubber material G cutting device 2 is obtained in which the adhesion of fragments of the rubber material G is suppressed.

The embodiments disclosed this time are exemplary in all respects and are not restrictive. The technical scope of the present invention is not limited to the above-described embodiments, and the technical scope includes all modifications within the same scope as the configurations described in the claims.

The rubber material cutting device described above can also be applied to cutting various rubber materials.

2 ... Cutting device 4 ... Cutting part 6 ... Cutting tool 8 ... Moving means 10 ... Holder 12 ... Horizontal moving means 14 ... Vertical moving means 38 ... Holding part 40・ ・ ・ Holding plate 42 ・ ・ ・ Mounting stand 44 ・ ・ ・ Blade part 46 ・ ・ ・ Mounting part 48 ・ ・ ・ Surface of blade part 44 50 ・ ・ ・ Blade tip 52 ・ ・ ・ Main body 52a ・ ・ ・ First main body 52b・ ・ ・ Second body 54 ・ ・ ・ Back surface of blade 44 ・ ・ ・ Recess 60, 60a, 60b ・ ・ ・ Horizontal edge 62, 62a, 62b ・ ・ ・ Vertical edge 64, 64a, 64b ・ ・ ・ Side end 66 ... Cutting board 68 ... Heating means

Claims (9)

A rubber material cutting device that cuts a rubber material while moving the cutting tool in the width direction and the length direction by a means of transportation.
The cutting tool includes a blade for cutting the rubber material.
The blade is a single-edged blade with a blade on the surface.
There is a dent on the back of the blade
The blade portion is composed of a blade edge and a main body.
The recess has a horizontal edge extending in the width direction.
The horizontal edge is provided at a position at least 10 mm inward in the length direction from the tip of the blade portion.
A rubber material cutting device in which a horizontal edge on the tip end side of the recess is located between the tip end and the trailing end of the cutting edge in the length direction . The recess has a vertical edge extending in the length direction.
The rubber material cutting apparatus according to claim 1, wherein the vertical edge is provided at a position at least 10 mm inward in the width direction from the side end of the blade portion. The rubber material cutting apparatus according to claim 1 or 2 , wherein the angle formed by the front surface of the cutting edge of the cutting edge with respect to the back surface is 8 ° or more and 12 ° or less. The rubber material cutting device according to any one of claims 1 to 3 , wherein the length of the blade portion is 90 mm or more and 110 mm or less. The rubber material cutting device according to any one of claims 1 to 4 , wherein the angle of entry of the blade into the rubber material is 15 ° or more and 30 ° or less. The moving means includes a heating means for heating the cutting tool.
The rubber material cutting apparatus according to any one of claims 1 to 5 , wherein in the cutting tool heated by the heating means, the temperature of the cutting edge of the blade portion is at least 170 ° C. The rubber material cutting device according to any one of claims 1 to 6 , wherein the cutting tool is simultaneously moved in the width direction and the length direction by the moving means. The main body is composed of a first main body connected to the cutting edge and a second main body connected to the first main body.
A blade is attached to the surface of the cutting edge and the surface of the first main body.
The rubber material according to any one of claims 1 to 7, wherein the angle formed by the front surface of the first main body of the blade portion with respect to the back surface is smaller than the angle formed by the front surface with respect to the back surface of the cutting edge of the blade portion. Cutting device. According to claim 8, the difference between the angle formed by the front surface of the cutting edge of the blade portion with respect to the back surface and the angle formed by the front surface of the first main body of the blade portion with respect to the back surface is 3 ° or more and 5 ° or less. The described rubber material cutting device.

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