JP2019198934A - Cutting apparatus for rubber material - Google Patents

Abstract

To provide a cutting apparatus 2 for a rubber material G, which can inhibit adhesion of pieces of the rubber material G when the sheet-like rubber material G is cut.SOLUTION: A cutting apparatus 2 is the cutting apparatus 2 for a rubber material G, which cuts the rubber material G while moving a cutting tool 6 its width direction and lengthwise direction by movement means 8. In the cutting apparatus 2 for the rubber material G, the cutting tool 6 comprises a blade part 44 for cutting the rubber material G. The blade part 44 is a single-edged blade having an edged surface 48, and a depressed area 56 is formed on the back side 54 of the blade part 44.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a rubber material cutting device. Specifically, the present invention relates to a rubber material cutting device used for manufacturing a tire.

  In the manufacture of a tire, for example, a rubber composition for a sidewall is extruded to form a sheet-like rubber material (hereinafter referred to as a rubber sheet). The rubber sheet is cut at a predetermined length to obtain a plate-like rubber material (hereinafter referred to as a rubber plate). In the length direction, the rubber plate has cut surfaces at both ends thereof.

  The rubber plate is wound around the drum of the molding machine. The cutting surface at the front end and the cutting surface at the rear end are joined, and the 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 cut surfaces are joined, that is, a joined portion is unique compared to a portion other than the joined portion. Various studies have been made on a rubber sheet cutting device and a cutting method so that the cut surfaces are sufficiently bonded to each other and bonding failure does not occur (for example, Patent Document 1).

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

Japanese Unexamined Patent Publication No. 2017-200714

  When cutting a rubber sheet, the cutting tool usually enters the rubber sheet obliquely in order to use the cut surface as a joining surface. Since the cutting tool moves while being in contact with the rubber sheet, pieces of the rubber sheet are likely to adhere to the back surface of the cutting tool.

  When the rubber sheet is cut with a cutting tool to which pieces are attached, irregularities reflecting the shape of the pieces 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 is uneven.

  In order to easily cut the rubber sheet, the cutting tool may be heated by heating means such as a heater. In this case, if a piece adheres to the cutting tool, heat is taken away by the piece and the temperature of the cutting tool decreases. When the rubber sheet is cut with a cutting tool whose temperature has been lowered, the cut surface becomes rough and the cut surface is uneven.

  When unevenness occurs on the cut surfaces, the cut surfaces cannot be brought into close contact with each other, and a good bonded 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 piece is scraped off from the cutting tool using a tool such as a scissors. However, cleaning with a tool may damage the cutting tool. Fragments are likely to adhere to the cut cutting tool. There is a concern that cleaning with a tool may reduce the useful life of the cutting tool. The fact is that the cutting tool of the cutting device is replaced with a new cutting tool once every two weeks.

  If adhesion of fragments to the cutting tool can be suppressed, a cut surface having no unevenness can be obtained. In this case, since the frequency of cleaning can be lowered, an improvement in productivity can be expected. Since cutting with a tool is not necessary, the cutting tool is hardly damaged. If sticking of fragments to the cutting tool can be suppressed, an increase in the useful life of the cutting tool can be expected.

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

The rubber material cutting device according to the present invention is a rubber material cutting device that cuts the rubber material while moving the cutting tool in the width direction and the length direction by the 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 blade with a blade on the surface, and a recess is formed on the back surface of the blade portion.

  Preferably, in this rubber material cutting device, the recess has a lateral edge extending in the width direction, and the lateral edge is provided at a position at least 10 mm away from the tip of the blade portion inward in the longitudinal direction.

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

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

  Preferably, in this rubber material cutting device, the blade portion has a length of 90 mm to 110 mm.

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

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

  Preferably, in this rubber material cutting device, the cutting means 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. The recess portion does not come into contact with the rubber material when the rubber material is cut. Since it is not the entire back surface but a part that contacts the rubber material, it is difficult for the pieces of rubber material to adhere to the back surface of the blade portion. In this cutting apparatus, when the sheet-like rubber material is cut, adhesion of pieces of the rubber material can be suppressed.

  In this cutting apparatus, since the adhesion of fragments to the blade portion is suppressed, when the rubber material is cut using this cutting tool, a cut surface having no irregularities can be obtained. Since the frequency of cleaning can be lowered, this cutting apparatus can be expected to improve productivity. Cleaning with a tool is not required, so the cutting tool is not easily damaged. For this reason, this cutting device can increase the service life of the cutting tool.

FIG. 1 is a perspective view showing the 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 unit of the cutting apparatus of FIG. FIG. 3 is a view showing the surface of the cutting tool. FIG. 4 is a view 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. 3. FIG. 6 is a view for explaining the cutting procedure of the rubber material.

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

  FIG. 1 shows an outline of a cutting device 2 according to an embodiment of the present invention. The cutting device 2 cuts the rubber material G. Specifically, in the cutting device 2, a sheet-like rubber material G (hereinafter referred to as a rubber sheet G) used for manufacturing a tire is cut. As a result, a plate-like rubber material (hereinafter referred to as a rubber plate) as a part such as a sidewall or an apex is 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 cut by the cutting device 2 is obtained by extruding an unvulcanized rubber composition in an extruder (not shown). The rubber sheet G is long.

[Cutting device 2]
The cutting device 2 includes a cutting unit 4. The cutting unit 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 by the moving means 8 in the length direction of the cutting tool 6. 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 the outline of the cutting part 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 unit 4 includes the cutting tool 6 and the 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 that fixes the cutting tool 6 and a support portion 18 that extends rearward from the fixing portion 16.

  The lateral movement means 12 moves the cutting tool 6 in the width direction of the cutting tool 6. The transverse movement 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 transverse shaft 20 is supported by a bearing 26. The other end of the traverse shaft 20 is connected to a rotation shaft (not shown) of the traverse motor 24. By driving the traverse motor 24 and rotating the rotary shaft, the traverse shaft 20 rotates.

  In this cutting device 2, the traversing shaft 20 and the traversing nut 22 are screwed (not shown), and the traversing shaft 20 is screwed into the traversing nut 22. In the transverse movement means 12, the transverse nut 22 moves in the width direction as the transverse shaft 20 rotates. In the cutting device 2, a traversing nut 22 is attached to the support portion 18 of the holder 10, specifically to the rear portion of the support portion 18. For this reason, when the traversing 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 this cutting device 2, the cutting tool 6 is moved in the width direction by the lateral movement means 12.

  The longitudinal moving means 14 moves the cutting tool 6 in the length direction of the cutting tool 6. The longitudinal movement means 14 includes a longitudinal axis 28, a longitudinal nut 30, a longitudinal motor 32, and a longitudinal 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 the bearing 26. The other end of the longitudinal shaft 28 is connected to a rotation shaft (not shown) of the longitudinal motor 32. The longitudinal shaft 28 is rotated by driving the longitudinal motor 32 and rotating the rotation shaft.

  In this cutting device 2, the longitudinal shaft 28 and the longitudinal nut 30 are engraved with screws (not shown), and the longitudinal shaft 28 is screwed into the longitudinal nut 30. In the longitudinal movement means 14, the longitudinal nut 30 moves in the length direction as the longitudinal shaft 28 rotates.

  In the cutting device 2, the longitudinal nut 30 is attached to the longitudinal plate 34. Portions on both sides of the longitudinal plate 34 in the width direction are fitted to the longitudinal rails 36, respectively. In the longitudinal moving means 14, the longitudinal plate 30 moves in the length direction by moving the longitudinal nut 30 in the length direction.

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

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

  The cutting device 2 includes a pressing 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 the 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. In FIG. 4, the thickness of the cutting tool 6 indicated by the double-headed arrow T is normally set as appropriate within a range of 7 mm to 9 mm.

  The cutting tool 6 includes a blade portion 44 and an attachment 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 attachment portion 46 is fixed to the fixing portion 16 of the holder 10.

  The blade portion 44 is not a double blade but a single blade. As shown in FIG. 4, in the cutting device 2, a blade is attached to the surface 48 of the blade portion 44. The blade portion 44 is a single blade with a blade attached to the surface 48. In FIG. 3, the symbol 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 attachment portion 46 side. Furthermore, the main body 52 includes a first main body 52a on the cutting edge 50 side and a second main body 52b on the attachment portion 46 side. In this cutting device 2, a blade is attached to the surface 48 of the blade edge 50 and the surface 48 of the first main body 52a.

  In FIG. 4, symbol PF is the rear end of the blade edge 50 on the surface 48 of the blade portion 44. On the surface 48 of the blade portion 44, the rear end PF of the blade edge 50 is also the front end of the first main body 52a. A double arrow LF is a distance from the front end PE of the blade edge 50 to the rear end PF. In this cutting device 2, the distance LF from the front end PE to the rear end PF of the blade edge 50 is appropriately set in the range of 13 mm to 17 mm.

  In FIG. 4, the symbol PM is the rear end of the first main body 52 a 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 front end of the second main body 52b. A double arrow LM is a distance from the front end PE of the blade edge 50 to the rear end PM of the first main body 52a. In this cutting device 2, the distance LM from the front end PE of the blade 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 the 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 the cutting device 2, the inclination of the surface 48 in the first main body 52 a is gentler than the inclination of the surface 48 in the cutting edge 50.

  As shown in FIG. 5, in the 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 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 constituted by a bottom surface 58 a extending along the back surface 54 and a slope 58 b that bridges the bottom surface 58 a and the back surface 54.

  In this cutting device 2, the depression 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 lateral edge 60a on the front end PE side is located on the inner side in the length direction than the front end PE. In the cutting device 2, the lateral edge 60 a on the front end PE side is also a boundary between the inclined surface 58 b of the recess 56 and the back surface 54. The lateral edge 60 b on the attachment portion 46 side is located on the inner side in the length direction than the attachment portion 46. On the mounting portion 46 side, the corner portion constituted by the horizontal edge 60b and the vertical edge 62 is rounded.

  The left and right vertical edges 62 are respectively positioned on the inner side in the width direction of the side end 64 of the blade portion 44. As shown in FIG. 5, in this cutting device 2, the distance in the width direction 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 may be the same as the distance in the width direction from the left side edge 64b to the vertical edge 62b.

[Attaching the cutting tool 6]
As described above, in this cutting apparatus 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 on the rear side of the front surface 48. As shown in FIG. 6, in this cutting device 2, the orientation of the blade portion 44 is adjusted by angle adjusting means (not shown) so that the blade portion 44 enters obliquely with respect to the rubber sheet G. Thereby, the cutting tool 6 is set to 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 direction in which the blade portion 44 enters. 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 the cutting device 2, the angle θ is an angle of entry of the blade portion 44 into the rubber material G.

[Cutting the rubber sheet G by the cutting device 2]
In the cutting device 2, the rubber sheet G is cut as follows. In the cutting method using this cutting device 2, the direction of the blade portion 44 of the cutting tool 6 is adjusted. Specifically, the entry angle θ of the blade portion 44 to 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 movement distance of the rubber sheet G reaches a preset distance, the movement of the rubber sheet G is stopped. After the stop, as shown in FIG. 6, the pressing plate 40 of the pressing portion 38 presses the rubber sheet G against the mounting table 42. Thereby, the position shift with respect to the mounting base 42 of the rubber sheet G 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 is allowed to enter the rubber sheet G. The rubber sheet G is cut and a rubber plate is obtained. In this cutting device 2, in order to protect the cutting edge 50 of the blade portion 44, a resin cutting board 66, specifically, a heat resistant material, is placed on the portion of the mounting table 42 where the cutting edge 50 of the blade portion 44 is close. A cutting board 66 made of natural MC nylon is provided. In particular, a groove having a depth of 1 mm to 2 mm is engraved at a location where the blade tip 50 is likely to contact, although not shown.

  In this cutting method, the rubber plate obtained by cutting the rubber sheet G is transported to the next step by a transport 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 this cutting device 2, the recess 56 is provided on the back surface 54 of the blade portion 44 of the cutting tool 6. The recess 56 does not come into contact with the rubber sheet G when the rubber sheet G is cut. Since the rubber sheet G is in contact with a part rather than the entire back surface 54, wear of the rubber sheet G is prevented. In this cutting device 2, the pieces of 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-like rubber material G is cut, adhesion of pieces of the rubber material G is suppressed.

  In this cutting device 2, since the sticking to the blade portion 44 is suppressed, when the rubber sheet G is cut using the cutting tool 6, a cut surface without unevenness can be obtained. Since the frequency of cleaning can be lowered, the cutting device 2 can be expected to improve productivity. Since cleaning using a tool is not necessary, the cutting tool 6 is hardly damaged. For this reason, this cutting device 2 can increase the service 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. From the viewpoint of effectively preventing the bending of the tip PE of the blade tip 50, beryllium copper is preferable as the material of the cutting tool 6.

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

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

  As described above, in the cutting device 2, the lateral edge 60a on the front end PE side is located on the inner side in the length direction than the front end PE. Since the strength of the blade edge 50 is ensured, deformation of the blade edge 50 is suppressed. The cutting device 2 can stably cut the rubber sheet G while preventing the 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 includes a lateral edge 60 a extending in the width direction, and the lateral edge 60 a is provided at a position at least 10 mm away from the tip PE of the blade portion 44 in the longitudinal direction. Is preferred. In other words, the distance DY from the tip PE of the blade portion 44 to the lateral edge 60a on the tip PE side of the recess 56 is preferably 10 mm or more. The distance DY is preferably 20 mm or less from the viewpoint of effectively preventing fragmentation.

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

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

  In FIG. 4, a double arrow DT is a distance from the side end 64 of the blade portion 44 to the vertical edge 62 of the recess 56. A double arrow WA is the width of the blade portion 44. A double arrow WH indicates 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 that is about 100 mm larger than the width of the rubber sheet G to be cut.

  As described above, in the cutting device 2, the vertical edge 62 is located on the inner side in the width direction of the side end 64 of the blade portion 44. Thereby, although the hollow 56 is provided, the intensity | strength of the blade part 44 is maintained appropriately. In the 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, in this cutting device 2, the recess 56 includes a vertical edge 62 extending 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 preferred that 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. The distance DT is preferably 60 mm or less from the viewpoint of effectively preventing fragmentation. In this cutting device 2, the sum of the left and right distances DT is preferably 20 mm or more and 100 mm or less from the viewpoint of stably cutting the rubber sheet G while preventing the fragments of the rubber sheet G from adhering to the blade portion 44. Is preferred.

  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 sticking of the rubber sheet G to the blade portion 44 is effectively prevented. 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, the blade is attached to the surface 48 of the blade edge 50. That is, in 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 in 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 the 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 52 a, 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 52 a. This angle β is an inclination angle of the surface 48 in the first main body 52a.

  In this cutting device 2, the inclination angle α of the surface 48 of the blade edge 50 is preferably 8 ° or more, and preferably 12 ° or less. By setting the inclination angle α to 8 ° or more, the blade portion 44 has an appropriate strength. In the cutting device 2, deformation such as bending of the blade edge 50 is prevented. By setting the inclination angle α to 12 ° or less, the cutting edge 50 exhibits a good sharpness. In addition, 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 the cutting device 2, the inclination of the surface 48 in the first main body 52 a is gentler than the inclination of the surface 48 in the cutting edge 50. In other words, the inclination angle β of the surface 48 in the first main body 52 a is smaller than the inclination angle α of the surface 48 in the cutting edge 50. In this cutting device 2, since the close contact between the blade portion 44 and the rubber sheet G is moderately suppressed, the fragments of the rubber sheet G can be 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 between the inclination angle α and the inclination angle β is preferably 3 ° or more, and more preferably 5 ° or less.

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

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

  The cutting device 2 includes heating means 68 for heating the cutting tool 6 in order to cut the rubber sheet G smoothly. In this cutting device 2, as shown in FIGS. 1 and 2, a heating means 68 is provided on the holder 10, in particular, the width direction outer side portion (hereinafter referred to as a side portion) 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 fixed portion 16. In the 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 it can sufficiently heat the blade edge 50. An example of the heating means 68 is an electrothermal heater. In the cutting device 2, in the cutting tool 6 heated by the heating means 68, the temperature of the blade edge 50 is preferably at least 170 ° C. from the viewpoint that the blade edge 50 exhibits a good sharpness. Preferably, the temperature of the cutting edge 50 is 180 ° C. at most from the viewpoint of suppressing the quality change (for example, rubber burn) of the cut surface.

  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 moving the cutting tool 6, that is, the cutting edge 50 alternately in the width direction and the length direction. This cutting device 2 can also cut the rubber sheet G while simultaneously moving the blade edge 50 in the width direction and the length direction. In particular, when the rubber sheet G is cut while simultaneously moving the cutting edge 50 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 apparatus 2, the rubber sheet G is used from the viewpoint that the depression 56 provided on the back surface 54 of the blade portion 44 prevents the sticking of the rubber sheet G to the blade portion 44 more effectively. When cutting, the cutting tool 6 is preferably moved simultaneously in the width direction and the length direction by the moving means 8.

  In this cutting device 2, it has been confirmed that the rubber sheet G can be cut without replacing the cutting tool 6 for two months or more (the number of cuttings is 80,000 times or more). Considering that the rubber material G was cut while exchanging the cutting tool once every two weeks in the conventional cutting apparatus, the cutting apparatus 2 of the present invention is more remarkable than the conventional cutting apparatus. It is clear that there is an effect.

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

  The embodiments disclosed herein are illustrative and non-restrictive in every respect. The technical scope of the present invention is not limited to the above-described embodiments, and the technical scope includes all modifications within the scope equivalent to the configurations described in the claims.

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

DESCRIPTION OF SYMBOLS 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 ... Presser plate 42 ... Place 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 portion 56 ... Depression 60, 60a, 60b ... Horizontal edge 62, 62a, 62b ... Vertical edge 64, 64a, 64b ... Side end 66 ... cutting board 68 ... heating means

Claims (8)

A rubber material cutting device for cutting a rubber material while moving the cutting tool in its width direction and length direction by a moving means,
The cutting tool includes a blade portion for cutting the rubber material;
The blade part is a single blade with a blade on the surface,
A rubber material cutting device having a recess on a back surface of the blade portion. The recess has a lateral edge extending in the width direction,
The rubber material cutting device according to claim 1, wherein the lateral edge is provided at a position at least 10 mm away from the tip of the blade portion inward in the longitudinal direction. The depression has a vertical edge extending in the length direction,
The rubber material cutting device according to claim 1 or 2, wherein the vertical edge is provided at a position at least 10 mm away from the side end of the blade portion inward in the width direction.   The rubber material cutting device according to any one of claims 1 to 3, wherein an angle formed by the front surface with respect to the back surface is 8 ° or more and 12 ° or less in the blade edge of the blade portion.   The rubber material cutting device according to any one of claims 1 to 4, wherein the blade has a length of 90 mm to 110 mm.   The rubber material cutting device according to any one of claims 1 to 5, wherein an angle of entry of the blade portion into the rubber material is 15 ° or more and 30 ° or less. The moving means comprises heating means for heating the cutting tool,
The rubber material cutting device according to any one of claims 1 to 6, wherein in the cutting tool heated by the heating means, a temperature of a blade edge of the blade portion is at least 170 ° C.   The rubber material cutting device according to any one of claims 1 to 7, wherein the cutting means is moved simultaneously in the width direction and the length direction by the moving means.

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