JP5084338B2 - Method and apparatus for perforating belt-shaped rubber member - Google Patents

Description

    The present invention relates to a drilling method and apparatus for continuously punching a belt-like rubber member such as an inner liner.

As a conventional method and apparatus for perforating a belt-shaped rubber member, for example, the one described in Patent Document 1 below is known.
Japanese Patent Publication No. 50-29752

  In the prior art of this publication, in order to extract air from a belt-like rubber member such as a tread band before vulcanization, a large number of needles are implanted on the surface of the punching roller, and the punching roller is pressed against the belt-like rubber member and rotated. In addition, it is described that a method of making a hole in a sheet-like or band-like belt-like rubber member is generally performed. Further, as an embodiment, the inner cylinder supported by the fixed shaft and the outer cylinder also supported by the fixed shaft rotate eccentrically, and the needle provided in the inner cylinder and extending in the radial direction is There is described a perforation roller that allows a needle entry / exit hole provided in an outer cylinder to freely enter / exit, and that when a needle protrudes from the outer cylinder, the needle-shaped rubber member is perforated by the needle.

    However, in such a conventional method and apparatus for perforating a belt-shaped rubber member, usually, the belt-shaped rubber member is once wound up into a roll and then fed to the perforation roller while being unwound from the winding roll. As a result, the belt-like rubber member has a low temperature at the time of drilling (high temperature) and the rubber hardness is high. As a result, the needle cannot surely penetrate the belt-like rubber member, and air bleeding is prevented. There was a problem of becoming insufficient.

  In order to solve such a situation, after winding the belt-shaped rubber member around the cylindrical molding drum, as an additional operation, the operator manually pierces the drilled cone into the necessary portion of the belt-shaped rubber member, and forms an additional through hole. However, since such a work interrupts the tire manufacturing work, there is a problem in that work efficiency is reduced and much time and labor are required.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a belt-like rubber member perforating method and apparatus capable of reliably perforating a belt-like rubber member with high efficiency while saving labor.

The purpose of this is to firstly, when the perforating roller is rotating around the axis, the belt-shaped rubber member is allowed to travel in the longitudinal direction while passing around the perforating roller, so that the outer periphery of the perforating roller is at least during perforation. projecting radially outward from the surface, a plurality of perforation needles provided in the perforated roller, the drilling method of the belt-shaped rubber member which is adapted to mold one after another through hole in the belt-shaped rubber member, generally by heating means heating The perforation needle is heated by the conduction heat from the perforated roller, and only the both end portions in the axial direction of the perforation roller are further heated by the sub-heating means, and the amount of heat per unit time applied to the perforation roller is perforated. By the perforating method of the belt-shaped rubber member that is larger at both axial ends than the axial central portion of the roller, it can be achieved,

Secondly, a perforation roller that rotates around an axis, and a plurality of perforation needles that are provided on the perforation roller and project at least radially outward from the outer peripheral surface of the perforation roller when perforating the belt-shaped rubber member. In the perforating device for a belt-shaped rubber member, the through-holes are formed one after another in the belt-shaped rubber member by a perforating needle by running the belt-shaped rubber member in the longitudinal direction while passing around the rotating perforating roller. A heating means for heating the entire perforation roller is provided to heat the perforation needle by conduction heat from the perforation roller, and a sub-heating means for heating only both axial ends of the perforation roller is further provided; the amount of heat per unit applied time, the punching device of the belt-shaped rubber member which is a large at both axial ends than the axial central portion of the perforated roller, to achieve Door can be.

  In this invention, when the through-hole is formed in the belt-like rubber member by the punch needle of the punching roller while passing the belt-like rubber member around the punching roller, at least the tip portion of the punching needle is heated. Even if the temperature of the belt-like rubber member is low, heat is applied from the tip of the piercing needle to the belt-like rubber member at the piercing site, the temperature rises, and the rubber hardness falls. As a result, the piercing needle can be easily pushed into the belt-like rubber member, and the through-hole can be reliably and efficiently molded while saving labor.

Further, since the resistance when the piercing needle is pushed into the belt-like rubber member is reduced, the local tension generated in the belt-like rubber member near the piercing site can be reduced, and as a result, the belt-like rubber member is thin. However, it is possible to effectively suppress a situation where a large local elongation or tear occurs. Furthermore, it is possible to suppress rubber curling and perforation needle breakage in the vicinity of the through-hole, and to uniformly form a uniform through-hole . Moreover, Thong Anahari can be easily uniformly heated, to be et al., For both axial ends of the perforated roller has a large heat dissipation, the temperature than the axial center portion is reduced, as in the present invention If comprised, the temperature distribution in the axial direction of a perforation roller and a perforation needle can be made uniform.

Also, according to the structure as claimed in claim 4, it is possible to strongly suppress a situation in which local tensions generated in the belt-shaped rubber member puncture site near, smooth rubber debris generated by drilling Can be discharged.

Et al is, configured according to 請 Motomeko 5 can be adjusted easily heating temperature yet has a simple structure. Also, according to the structure as claimed in claim 6, yet it has a simple structure, which facilitates temperature control.

Embodiment 1 of the present invention will be described below with reference to the drawings.
1, 2, 3, and 4, 11 is a roll rotatably supported by an unillustrated unwinding device, and this roll 11 is wound around the bobbin 12 and around the bobbin 12 in a roll shape. The belt-like rubber member 13 is made of a thin natural rubber rubber, and is composed of a wide and continuous belt-like inner liner outer layer (B layer) used for large construction vehicles and the like. Thus, since the belt-like rubber member 13 is molded by the calender roll and then wound around the bobbin 12, the temperature is lowered to around normal temperature (about 50 to 60 ° C.), and the rubber hardness is increased.

  And after such a belt-shaped rubber member 13 is unwound from the bobbin 12, it is bonded to an inner liner inner layer (A layer) made of a thin butyl rubber rubber having high air permeability resistance in a later step. Since both are thin and soft, air is likely to enter between them. For this reason, a large number of through holes are widely formed by perforating the band-like rubber member 13 on the side in close contact with the carcass layer prior to the above-described bonding. Here, the belt-like rubber member 13 described above may be a top tread, a side tread, a rubber chafer, or a narrow rubber ribbon.

  16 is a punching device that is installed on the downstream side of the roll 11 and punches the belt-like rubber member 13. The punching device 16 is installed above the fixed frame 17 and the fixed frame 17, and the fixed frame And a movable frame 18 that can be moved closer to and away from 17. A pair of bearings 19 are fixed to the movable frame 18, and shaft parts 21 protruding from both ends in the axial direction of the piercing roller 20 extending parallel to the roll 11 are rotatably supported on these bearings 19. The cylindrical perforating roller 20 can rotate around its own axis by receiving a driving force from a driving mechanism (not shown) such as a driving motor.

  The perforating roller 20 has a radially inner end (base end) of a plurality of perforating needles 23 extending in the radial direction fixed thereto. As a result, the perforating needles 23 are radially outward from the outer peripheral surface 20a of the perforating roller 20. The belt-like rubber member 13 always protrudes by a protrusion amount M slightly larger than the wall thickness t. Then, when the belt-like rubber member 13 unwound from the roll 11 passes around the perforation roller 20 having the perforation needle 23, here, slightly below, the perforation needle 23 pierces the belt-like rubber member 13, As a result, the belt-like rubber member 13 is successively perforated in the full width by the perforating needle 23. In the present invention, the belt-shaped rubber member may pass through the periphery while making linear contact with the outer peripheral surface of the perforation roller, or may be surrounded by close contact with the outer peripheral surface of the perforation roller by an angle of 180 degrees or less. You may pass.

  When the belt-like rubber member 13 passes around the perforating roller 20 as described above, the protrusion amount M of the punching needle 23 is slightly larger than the wall thickness t of the belt-like rubber member 13 as described above. 23 penetrates through the belt-like rubber member 13, and thereby the plurality of through holes 24 penetrating in the thickness direction should be formed in the belt-like rubber member 13, but may fail for various reasons. Here, a plurality of the perforating needles 23 are arranged at equal distances in the circumferential direction at the same axial position of the perforating roller 20, thereby forming a perforating needle group 26. A plurality are installed equidistantly in 20 axial directions.

  In this invention, the perforating roller is rotated about the second fixed shaft that is eccentric from the first fixed shaft and the outer tube that rotates about the first fixed shaft, and is loosely fitted to the outer tube. The outer cylinder and the inner cylinder are rotated around the first and second fixed shafts so that the piercing needle provided in the inner cylinder can freely enter and exit from the access hole provided in the outer cylinder. Thus, the belt-shaped rubber member may be perforated with a perforating needle that protrudes by a maximum amount from the access hole during perforation. In this case, the piercing needle protrudes from the outer peripheral surface of the piercing roller (outer cylinder) only before and after piercing. In this way, the punching needle only has to protrude radially outward from the outer peripheral surface of the punching roller when punching at least the belt-like rubber member.

  On the other hand, a regulating roller 29 parallel to the perforating roller 20 is installed on the opposite side of the belt-like rubber member 13 from the perforating roller 20, here, below the belt-like rubber member 13, and a shaft protruding from both axial ends of the regulating roller 29 The part 30 is rotatably supported by a pair of bearings 31 fixed to the fixed frame 17. The cylindrical regulating roller 29 receives a driving force from a driving mechanism (not shown), for example, a driving motor, and rotates in a direction opposite to the perforating roller 20 around an axis parallel to the axis of the perforating roller 20. be able to. The outer peripheral surface 29a of the regulating roller 29 is separated from the outer peripheral surface 20a of the punching roller 20 by a distance slightly larger than the wall thickness t of the belt-like rubber member 13. This distance may be substantially the same value as the wall thickness t. In this case, the belt-shaped rubber member is sandwiched from both sides by the perforating roller and the regulating roller during perforation.

  32 and 33 are guide rollers installed slightly upstream and downstream from the upper end of the regulating roller 29, and the guide roller 32 removes the belt-like rubber member 13 unwound from the roll 11 from the outer peripheral surface of the upper end portion of the regulating roller 29. On the other hand, the belt-like rubber member 13 that is pressed against 29a and is in close contact with the outer peripheral surface 29a of the regulating roller 29 at the position of the guide roller 33 is peeled off from the regulating roller 29. As a result, the belt-like rubber member 13 travels downstream between the guide rollers 32 and 33 while being in close contact with the outer peripheral surface 29a of the regulating roller 29. At this time, the belt-like rubber member 13 is composed of the perforating roller 20 and the regulating roller 29. (Periphery of the perforation roller 20) and perforated by the perforation needle 23.

  On the outer peripheral surface 29a of the regulating roller 29, a plurality of (the same number as the punching needle group 26) circumferentially extending continuously in the circumferential direction at the same axial position (overlapping position) as the punching needle group 26 provided on the punching roller 20 is provided. Grooves 36 are formed. When the perforation needles 23 of each perforation needle group 26 perforate the belt-like rubber member 13 in these circumferential grooves 36, the belt-like rubber member 13 passes through the belt-like rubber member 13 and extends downward. The tip of the piercing needle 23 protruding to the side enters. As a result, the belt-like rubber member 13 is pierced by the piercing needle 23 in a state of being in close contact with the outer peripheral surface 29a of the regulating roller 29 between the piercing portions, and as a result, the belt-like rubber member 13 in the vicinity of the piercing portion is large. The situation in which the tension is locally generated can be strongly suppressed, and the rubber scrap generated by the perforation can be smoothly discharged through the circumferential groove 36.

  Reference numeral 40 denotes a plurality of heaters serving as axially extending heating means inserted and embedded in the radially outer end portion of the perforation roller 20, and these heaters 40 have almost the full length of the perforation roller 20, here the full length. It extends over and is spaced equidistantly in the circumferential direction. Here, as the heater 40 described above, for example, a hollow metal pipe that contains a heating wire (such as an iron chrome wire or a nichrome wire) that generates heat when energized and an insulating material can be used.

  If the heater 40 for heating the entire perforation roller 20 is provided in this way, the entire perforation needle 23 provided on the perforation roller 20 is easily and uniformly heated by the conduction heat from the perforation roller 20. As a result, when the through-hole 24 is formed in the belt-shaped rubber member 13 by the punch needle 23, even if the temperature of the belt-shaped rubber member 13 is low, heat is applied from the tip of the punch needle 23 to the belt-shaped rubber member 13 at the drilling site. As a result, the temperature rises and the rubber hardness decreases. As a result, the piercing needle 23 is easily pushed into the belt-like rubber member 13, and the through hole 24 can be reliably and efficiently formed, and the air entry can be reduced by, for example, about 42%.

Further, as described above, since the through hole 24 is reliably formed in the belt-like rubber member 13, it is not necessary for the operator to manually form the through hole 24 using a drilling cone, thereby saving labor. You can also Furthermore, since the rubber hardness is lowered, the resistance when the piercing needle 23 is pushed into the belt-like rubber member 13 is lowered, so that the local tension generated in the belt-like rubber member 13 near the piercing site can be reduced. As a result, even when the belt-like rubber member 13 is thin, it is possible to effectively suppress a situation in which a large local elongation or tear occurs. Further, it is possible to suppress the rubber from being bent and the punching needle 23 from being bent in the vicinity of the through hole 24, and the uniform through hole 24 can be uniformly formed .

Further, to form a steam chamber which is sealed to the puncture hole rollers inside, by supplying high temperature steam to the steam chamber, or to form a heating chamber into the perforation roller in the inner surface of the heating chamber planar You may make it heat a piercing roller and a piercing needle collectively by sticking a heat generating body.

  Here, as described above, if the heating means is composed of the heater 40 inserted into the perforation roller 20 and extending over almost the entire length of the perforation roller 20, the heating temperature of the perforation needle 23 can be simplified. Can be adjusted easily. However, if the heating to the perforation roller 20 is only the heater 40 as described above, the heat radiation amount at both axial ends of the perforation roller 20 is larger than the heat radiation amount at the central portion in the axial direction. 20. The temperature distribution of the piercing needle 23 is non-uniform, that is, the temperature at both axial end portions is lower than the temperature at the axial central portion, and the formation of the through holes 24 at both axial end portions tends to be uncertain.

  For this reason, in this embodiment, the auxiliary heater 43 as an auxiliary heating means for heating only the both axial end portions of the perforating roller 20 is additionally provided at the radially outer end portions at both axial end portions of the perforating roller 20. Inserted and buried. Here, the sub heater 43 has the same configuration as the heater 40, extends in parallel with the heater 40, and is alternately arranged with the heater 40 in the circumferential direction. As a result, the amount of heat per unit time applied from the heater 40 and the sub-heater 43 to the perforation roller 20 is larger at both axial ends than the central portion in the axial direction of the perforation roller 20, and the axial direction of the perforation roller 20 and the perforation needle 23 The temperature distribution can be made uniform.

  If the sub-heating means is constituted by the sub-heater 43 inserted only at both ends in the axial direction of the perforation roller 20 as described above, the temperature can be easily adjusted while the structure is simple. For example, in a perforation roller having only a heater without a sub-heater, a temperature difference of about 45 ° C. at the maximum on the outer peripheral surface between the axial end portions and the axial center portion is about 50 ° C. at the front end of the perforation needle. However, the temperature difference between the front and the latter was reduced to about 25 ° C. in the case of the perforated roller with the auxiliary heater added.

  In addition, as the above-mentioned sub-heating means, a cylindrical sub-steam chamber surrounding the both ends in the axial direction of the steam chamber from the outside is formed, and both end portions in the axial direction of the perforating roller 20 are supplied by supplying steam to the sub-steam chamber. Or by making the inner diameter of the steam chamber larger at both axial ends than the central portion in the axial direction, the amount of heat per unit time applied to the perforating roller can be increased from the central portion in the axial direction. It may be large at both ends in the direction.

  Here, it is preferable that each of the perforating needles 23 is heated until the tip portion is in the range of 100 to 130 degrees C. The reason is that if the heating temperature is less than 100 ° C., the formation of the through hole 24 in the low temperature rubber band 13 may be uncertain, whereas if it exceeds 130 ° C., it will contact the punch needle 23. The belt-like rubber member 13 at the portion that has been damaged may be vulcanized, and the penetration promotion effect of the piercing needle 23 is saturated, but if it is within the aforementioned range, unnecessary vulcanization and thermal energy of the belt-like rubber member 13 This is because the through-hole 24 can be more reliably formed while suppressing the waste of heat.

  The hole diameter D of the through hole 24 immediately after drilling is preferably in the range of 0.5 to 2.5 mm. The reason is that if the hole diameter D is less than 0.5 mm, the air can not be sufficiently removed. On the other hand, if the hole diameter D exceeds 2.5 mm, the through-hole 24 is not filled by rubber flow during vulcanization. The traces of the through holes 24 may remain in the product tire, but if it is within the above-mentioned range, the product tire after vulcanization is prevented from leaving the through holes 24 and the air is sufficiently vented. It is because it can be performed.

Next, the operation of the first embodiment will be described.
Now, the perforation roller 20 and the regulation roller 29 are rotated in the opposite directions around the axis by the drive mechanism, and the belt-like rubber member 13 is unwound from the roll 11 and travels toward the perforation roller 20 and the regulation roller 29. And When the belt-like rubber member 13 reaches the vicinity of the regulation roller 29, the belt-like rubber member 13 is pressed against and closely contacted with the outer peripheral surface 29a of the regulation roller 29 by the guide roller 32. It is conveyed around 20, here between the perforating roller 20 and the regulating roller 29.

  When the belt-like rubber member 13 travels in the longitudinal direction and passes between the punching roller 20 and the regulating roller 29, the punching needle 23 that always protrudes radially outward from the outer peripheral surface 20a of the punching roller 20 is the belt-like rubber member. At this time, since the protruding amount M of the piercing needle 23 is slightly larger than the thickness t of the band-shaped rubber member 13, the piercing needle 23 penetrates the band-shaped rubber member 13 and a plurality of the band-shaped rubber members 13 The through hole 24 is formed, and the tip portion protruding from the lower surface of the belt-like rubber member 13 enters the circumferential groove 36 of the regulating roller 29.

In this case, the perforation needles 23 the heater 40 overall is installed in perforated roller 20, because it is heated by the auxiliary heater 43, even when the temperature of the belt-shaped rubber member 13 is low, strip puncture site from perforation needles 23 Heat is applied to the rubber member 13, the temperature of the belt-like rubber member 13 rises, and the rubber hardness decreases. As a result, the piercing needle 23 is easily pushed into the belt-like rubber member 13, and the through-hole 24 is formed reliably and efficiently. Moreover, as described above, since the rubber hardness of the belt-like rubber member 13 is lowered, the resistance when the punching needle 23 is pushed into the belt-like rubber member 13 is lowered, so that the local tension generated in the vicinity of the punched portion is reduced. , The occurrence of large elongation and tearing is effectively suppressed.

  Thereafter, the belt-like rubber member 13 is peeled off from the regulating roller 29 at the position of the guide roller 33 and travels in the longitudinal direction toward the downstream side. In the subsequent step, the belt-like rubber member 13 is bonded to the inner liner inner layer (A layer). At this time, since both are thin and soft, air is easily generated between them. However, in this embodiment, as described above, the through-holes 24 are securely formed by punching the band-like rubber member 13 on the side that is in close contact with the carcass layer prior to the above-described bonding. Air is reliably excluded from the gap, and air entry in the product tire after vulcanization is effectively suppressed.

  The present invention can be applied to an industrial field in which perforation is continuously performed on a belt-like rubber member such as an inner liner.

It is a schematic front view which shows Embodiment 1 of this invention. It is a partially broken side view of the vicinity of a punching roller and a regulating roller. FIG. 3 is a cross-sectional view taken along the arrow I-I in FIG. 2. It is side surface sectional drawing explaining the piercing | piercing state by a piercing needle.

13 ... Strip rubber member 16 ... Punching device
20 ... perforation roller 20a ... outer peripheral surface
23 ... piercing needle 24 ... through hole
26… Perforated needle group 29… Regulator roller
29a ... outer peripheral surface 36 ... circumferential groove
40 ... Heater 43 ... Sub heater

Claims (6)

When the perforating roller is rotating around the axis, the belt-shaped rubber member runs in the longitudinal direction while passing around the perforating roller, thereby projecting radially outward from the outer peripheral surface of the perforating roller at least during perforation. In the method for punching a belt-like rubber member in which a plurality of punching needles provided on the roller are formed one after another in the belt-like rubber member, punching is performed by conduction heat from a punching roller heated entirely by a heating means. While the needle is heated, only the both ends in the axial direction of the perforation roller are further heated by the auxiliary heating means, and the amount of heat per unit time applied to the perforation roller is reduced from the axial center of the perforation roller to both ends in the axial direction. A method for perforating a belt-like rubber member, characterized in that it is large at the part . A belt-like rubber provided with a punching roller that rotates around an axis, and a plurality of punching needles that are provided on the punching roller and project at least radially outward from the outer peripheral surface of the punching roller when punching the belt-like rubber member. In the punching device for a belt-like rubber member, the through-holes are formed one after another in the belt-like rubber member by a punching needle by causing the member to travel in the longitudinal direction while passing around the rotating punching roller. By providing a heating means for heating the whole, the piercing needle is heated by conduction heat from the piercing roller, and a sub-heating means for heating only both ends in the axial direction of the piercing roller is further provided and applied to the piercing roller. A belt-like rubber member punching device characterized in that the amount of heat per unit time is greater at both axial ends than in the axial center of the punching roller . The belt-like rubber member perforating apparatus according to claim 2, wherein the heating means and the sub-heating means are alternately arranged in the circumferential direction. A plurality of the piercing needles are arranged side by side in the circumferential direction to form a piercing needle group, and a plurality of the piercing needle groups are arranged apart from each other in the axial direction of the piercing roller, while the piercing roller on the side opposite to the piercing roller of the belt-like rubber member A restriction roller that rotates about an axis parallel to the axis of the hole and is separated from the perforation roller, and a plurality of circumferences that continuously extend in the circumferential direction at the same axial position as each of the perforation hole groups on the outer peripheral surface of the restriction roller. 4. A band according to claim 2 , wherein a groove is formed, and when the piercing needle pierces the band-shaped rubber member, the tip of the piercing needle protruding through the band-shaped rubber member is allowed to enter the circumferential groove. Rubber member punching device. The belt-like rubber member punching device according to any one of claims 2 to 4, wherein the heating means includes a heater inserted into the punching roller and extending over substantially the entire length of the punching roller. The belt-like rubber member perforating apparatus according to any one of claims 2 to 5, wherein the sub-heating means is constituted by a sub-heater inserted only at both axial ends of the perforating roller.

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