JP4941610B1 - Rubber roll manufacturing apparatus and rubber roll manufacturing method - Google Patents

Abstract

A rubber roll manufacturing apparatus is provided that suppresses deformation of an unvulcanized rubber material at an end of a rubber roll.
SOLUTION: A rubber core 56 in which a core metal 22 is sequentially fed into a central portion of an unvulcanized rubber material extruded into a cylindrical shape at intervals, and an outer peripheral surface of the metal core 22 is covered with a rubber material, At least the peripheral part of the end surface 68 of the cored bar 22 is discharged by the discharger 12 that alternately discharges the hollow parts 58 that are hollow between the cored bars 22 and the rubber material of the hollowed part 58 discharged from the discharger 12. It is comprised so that it may be covered with the press 14 which presses the rubber material of the hollow part 58 inward.
[Selection] Figure 5

Description

  The present invention relates to a rubber roll manufacturing apparatus and a rubber roll manufacturing method.

  In Patent Document 1, in a rubber loam in which the outer peripheral surface of a core metal is coated with a rubber material by a cross-head die type rubber extruder, the outer diameter of the rubber bonding part of the core metal is φDa, and the bearing parts at both ends of the core metal When the outer diameter of φDb is φDb, the relationship between φDa and φDb is 1.0 <φDa / φDb ≦ 1.5. It is described that the floating peeling due to the shrinkage of the rubber material at the time is suppressed.

  In Patent Document 2, a rubber material is supplied to the outer peripheral surface of a core metal by a cross-head die type rubber extruder to form a rubber roll, and then the portions corresponding to both ends of the core metal of the rubber roll discharged from the extruder are described. It is described that the rubber material covered with the core metal discharged from the crosshead die type rubber extruder is suppressed from being lifted off from the core metal by being sandwiched by a heated gripping jig.

JP 2007-320126 A JP 2006-123256 A

  An object of this invention is to provide the rubber roll manufacturing apparatus and rubber roll manufacturing method which suppressed the deformation | transformation of the unvulcanized rubber material in the edge part of a rubber roll.

  In the rubber roll manufacturing apparatus according to claim 1 of the present invention, a metal core is sequentially fed into the center of an unvulcanized rubber material extruded in a cylindrical shape at intervals, and the outer peripheral surface of the metal core is made of the rubber material. A discharger that alternately discharges the coated rubber roll portion and a hollow portion in which the core metal is hollowed by the rubber material, and the core by the rubber material of the hollow portion discharged from the discharger And a pressing machine that presses the rubber material in the hollow portion inward so that at least the peripheral edge of the gold end surface is covered.

  The rubber roll manufacturing apparatus according to claim 2 of the present invention is further configured to discharge the rubber roll portion discharged from the discharger so that the thickness of the rubber material of the hollow portion is within a predetermined range. It is provided with a drawing machine that is pulled out from the machine.

  In the rubber roll manufacturing apparatus according to claim 3 of the present invention, the drawing speed of the rubber roll portion by the drawing machine is set in a range of 0.6 to 1.4 times the pushing speed of the rubber material. It is characterized by that.

  A rubber roll manufacturing method according to a fourth aspect of the present invention uses the rubber roll manufacturing apparatus according to any one of the first to third aspects, and the central portion of an unvulcanized rubber material extruded in a cylindrical shape is spaced apart. The metal cores are sequentially fed in, and the rubber roll portions in which the outer peripheral surface of the metal core is covered with the rubber material and the hollow portions in which the space between the metal cores is hollow with the rubber material are alternately discharged, A first step of inwardly pressing the rubber material of the hollow portion so that at least a peripheral portion of an end surface of the core metal is covered with the rubber material of the hollow portion; and the rubber of the rubber roll portion and the hollow portion A second step of vulcanizing the material and a third step of cutting the rubber material after vulcanization of the hollow portion are provided.

  According to the rubber roll manufacturing apparatus of the first aspect of the present invention, the deformation of the unvulcanized rubber material at the end of the rubber roll can be suppressed as compared with the case where the rubber material in the hollow portion is not pressed inward. it can.

  According to the rubber roll manufacturing apparatus of the second aspect of the present invention, the end of the rubber roll is compared with a case where the rubber roll portion is not pulled out from the discharger so that the thickness of the rubber material in the hollow portion is within a predetermined range. It can suppress that the thickness of the rubber material of a part increases.

  According to the rubber roll manufacturing apparatus of the third aspect of the present invention, when the drawing speed of the rubber roll portion by the drawing machine is not set in the range of 0.6 to 1.4 times the pushing speed of the rubber material. In comparison, the thickness of the rubber material in the hollow portion can be accurately set within a predetermined range.

  According to the rubber roll manufacturing method according to claim 4 of the present invention, the thickness of the rubber material compared to the case where the rubber roll is manufactured without using the rubber roll manufacturing apparatus according to any one of claims 1 to 3. A rubber roll in which unevenness is suppressed can be manufactured.

It is a figure which shows the structure of the rubber roll manufacturing apparatus which concerns on this invention. It is a figure which shows the operation | movement aspect of the pressing machine and drawing machine of FIG. It is a figure which shows the operation | movement aspect of the pressing machine and drawing machine of FIG. It is a figure which shows the operation | movement aspect of the pressing machine and drawing machine of FIG. It is a figure which shows the operation | movement aspect of the pressing machine and drawing machine of FIG. It is a figure which shows the operation | movement aspect of the pressing machine and drawing machine of FIG. It is a figure which shows the aspect of the thickness of the rubber material of a hollow part when the moving speed V3 of the holding member of FIG. 3 is less than 0.6 time with respect to the extrusion speed V2 of a rubber material. It is a figure which shows the aspect of the thickness of the rubber material of a hollow part at the time of making the moving speed V3 of the holding member of FIG. 3 exceed 1.4 times with respect to the extrusion speed V2 of a rubber material. It is a figure which shows the structure of the bag-bound rubber roll shape | molded using the rubber roll manufacturing apparatus which concerns on this invention. It is a figure which shows the structure of the rubber roll which is not a bag binding shape as a comparative example with respect to the rubber roll shape | molded using the rubber roll manufacturing apparatus which concerns on this invention.

  Hereinafter, an example of an embodiment of a rubber roll manufacturing apparatus and a rubber roll manufacturing method according to the present invention will be described with reference to the accompanying drawings.

  A rubber-coated shaft body (hereinafter referred to as “rubber roll”) manufactured by a rubber roll manufacturing apparatus and a rubber roll manufacturing method according to the present invention rotates, for example, in contact with a photosensitive drum of an image forming apparatus and rotates the outer peripheral surface of the photosensitive drum. Used as a charging roll for charging. In order to adhere to the outer peripheral surface of the photosensitive drum and charge the entire outer peripheral surface of the photosensitive drum without unevenness, a rubber roll with small thickness unevenness is required. Thickness unevenness can be suppressed by performing secondary processing such as polishing and surface treatment, but the manufacturing cost increases as the number of steps increases. Therefore, a rubber roll manufacturing apparatus and a rubber roll manufacturing method capable of forming a rubber roll with small thickness unevenness without performing secondary processing such as polishing and surface treatment are desired.

  FIG. 1 shows a configuration of a rubber roll manufacturing apparatus 10 according to the present invention.

  A rubber roll manufacturing apparatus 10 according to the present invention includes a discharger 12 configured by a so-called cross head die, a pressing machine 14 disposed below the discharging machine 12, and a drawer 16 disposed below the pressing machine 14. It has.

  The discharger 12 includes a rubber material supply unit 18 that supplies unvulcanized rubber material, an extrusion unit 20 that extrudes the rubber material supplied from the rubber material supply unit 18 in a cylindrical shape, and is extruded from the extrusion unit 20 into a cylindrical shape. And a metal core supply unit 24 for supplying the metal core 22 to the center of the rubber material.

  The rubber material supply unit 18 has a screw 28 inside a cylindrical main body 26. The screw 28 is rotationally driven by a drive motor 30. On the drive motor 30 side of the main body portion 26, an insertion port 32 for introducing a rubber material is provided. The rubber material introduced from the insertion port 32 is sent out toward the extrusion part 20 while being kneaded by the screw 28 inside the main body part 26. By adjusting the rotational speed of the screw 28, the speed at which the rubber material is fed out is adjusted.

  In addition, as a rubber material, it has 80 mass parts or more epichlorohydrin rubber among all the polymers, and what mix | blended 30-60 mass parts inorganic fillers, such as carbon and a calcium carbonate, is used.

  The extrusion unit 20 includes a cylindrical case 34 connected to the rubber material supply unit 18, a columnar mandrel 36 disposed in the center of the case 34, and a discharge head 38 disposed below the mandrel 36. I have. The mandrel 36 is held by the case 34 by a holding member 40. The discharge head 38 is held in the case 34 by a holding member 42. Between the outer peripheral surface of the mandrel 36 (in part, the outer peripheral surface of the holding member 40) and the inner peripheral surface of the holding member 42 (in part, the inner peripheral surface of the discharge head 38), an annular flow in which the rubber material flows annularly A path 44 is formed.

  An insertion hole 46 through which the core bar 22 is inserted is formed at the center of the mandrel 36. The lower part of the mandrel 36 has a tapered shape toward the end. A region below the tip of the mandrel 36 is a merge region 48 where the core metal 22 supplied from the insertion hole 46 and the rubber material supplied from the annular flow path 44 merge. That is, the rubber material is pushed out in a cylindrical shape toward the merging region 48, and the cored bar 22 is fed into the central portion of the rubber material pushed out in the cylindrical shape.

  The cored bar supply unit 24 includes a roller pair 50 disposed above the mandrel 36. A plurality of pairs (for example, three pairs) of roller pairs 50 are provided, and one roller of each roller pair 50 is connected to a driving roller 54 via a belt 52. When the driving roller 54 is driven, the cored bar 22 held by each roller pair 50 is sent toward the insertion hole 46 of the mandrel 36. The core metal 22 has a predetermined length, and the rear core metal 22 fed by the roller pair 50 presses the front core metal 22 existing in the insertion hole 46 of the mandrel 36, whereby a plurality of core bars 22 are formed. Sequentially pass through the insertion hole 46. The driving of the driving roller 54 is temporarily stopped when the front end of the front cored bar 22 is positioned at the tip of the mandrel 36, and the cored bar 22 is moved in the junction area 48 below the mandrel 36. It is sent at intervals.

  As described above, in the discharger 12, the rubber material is extruded in a cylindrical shape in the merging region 48, and the cored bar 22 is sequentially fed into the central portion of the rubber material at an interval. Thereby, the rubber roll portion 56 in which the outer peripheral surface of the core metal 22 is covered with the rubber material and the hollow portion 58 in which the space between the core metal 22 is made hollow with the rubber material are alternately discharged from the discharge head 38. It has become. In addition, a primer is applied in advance to the outer peripheral surface of the cored bar 22 in order to improve the adhesiveness with the rubber material.

  The pressing machine 14 has a pair of semi-cylindrical pressing members 60. The pair of pressing members 60 are disposed to face each other so as to sandwich the rubber roll portion 56 discharged from the discharger 12. Each pressing member 60 is formed with a pressing portion 62 that protrudes toward the center. Each pressing member 60 is movable in the left-right direction and the up-down direction by a drive mechanism (not shown).

  The drawer 16 has a pair of semi-cylindrical gripping members 64. The pair of gripping members 64 are opposed to each other so as to sandwich the rubber roll portion 56 discharged from the discharger 12. Each gripping member 64 is formed with a gripping portion 66 having a shape corresponding to the outer peripheral surface shape of the rubber roll portion 56. Each gripping member 64 is movable in the left-right direction and the up-down direction by a drive mechanism (not shown).

  2-6 has shown the operation | movement aspect of the pressing machine 14 and the drawing machine 16. FIG. In the figure, “V1” indicates the feed speed of the core bar 22, “V2” indicates the extrusion speed of the rubber material, and “V3” indicates the moving speed of the gripping member 64 downward (the discharge machine 12 by the drawer 16). The pulling speed of the rubber roll part 56 from is shown.

  As shown in FIG. 2, when the rear cored bar 22 is stopped at the position of the tip of the mandrel 36, that is, when the feeding speed of the cored bar 22 is set to zero (indicated as “V1 = 0” in the figure). Each gripping member 64 is moved in a direction approaching each other, and the rubber roll portion 56 is gripped by the gripping portion 66 of each gripping member 64.

  Then, as shown in FIG. 3, each gripping member 64 is moved downward while gripping the rubber roll portion 56. That is, the rubber roll part 56 is pulled out from the discharger 12 by each gripping member 64. If it does so, tension will act on the rubber material of the confluence | merging area 48, and the hollow part 58 by which the space between the metal cores 22 will be made of a rubber material will be formed.

  As shown in FIG. 4, the feeding of the cored bar 22 is resumed, and the hollow portion 58 moves to a position where the pair of pressing members 60 are opposed to each other. The feed speed V1 of the cored bar 22 and the extrusion speed V2 of the rubber material are substantially the same. And when the hollow part 58 moves to the opposing position of a pair of press member 60, as shown in FIG. 5, each press member 60 is moved to the direction which mutually approaches, and the rubber material of the hollow part 58 is each press member 60. Is pressed inward by the pressing portion 62. Thereby, the end surface 68 of the front core metal 22 and the end surface 68 of the rear core metal 22 are covered with the rubber material of the hollow portion 58.

  Then, as shown in FIG. 6, when the pressing members 60 are moved in directions away from each other, they are separated in the hollow portion 58, and a rubber roll 70 having a cored bar 22 binding shape is formed. Each gripping member 64 moves downward by an appropriate distance while gripping the separated rubber roll 70, and then a virtual line (two-dot chain line) in FIG. 2 as a standby position for gripping the next rubber roll portion 56. Move to the position indicated by.

  In FIG. 3, the moving speed of the gripping member 64, that is, the pulling speed V3 of the rubber roll portion 56 from the discharging machine 12 by the pulling machine 16 is 0.6 times or more and 1.4 times or less than the pushing speed V2 of the rubber material. It is set to a constant speed within the range. Thereby, the thickness of the rubber material of the hollow portion 58 becomes substantially the same as the thickness of the rubber material of the rubber roll portion 56 (the thickness of the rubber material of the hollow portion 58 is 90% or more to the thickness of the rubber material of the rubber roll portion 56 110. % Or less). When the drawing speed V3 of the rubber roll portion 56 is less than 0.6 times the rubber material pushing speed V2, the thickness of the rubber material of the hollow portion 58 is less than that of the rubber material of the rubber roll portion 56 as shown in FIG. Too thicker than thickness. Further, when the pulling speed V3 of the rubber roll portion 56 exceeds 1.4 times the pushing speed V2 of the rubber material, the thickness of the rubber material of the hollow portion 58 is less than that of the rubber material of the rubber roll portion 56 as shown in FIG. It becomes too thin than the thickness.

  FIG. 9 shows a configuration of a bag-like rubber roll 70 formed using the rubber roll manufacturing apparatus 10 according to the present invention.

  The bag-bound rubber roll 70 is placed in a vulcanization furnace in the next step. As a result, the rubber material of the rubber roll portion 56 and the rubber material of the portion covering the end face of the cored bar 22 (the rubber material of the hollow portion 58) are vulcanized.

  The vulcanized rubber roll 70 is processed in the next step. Specifically, the rubber material at both ends is cut so that the core metal 22 is exposed for a certain length at both ends of the rubber roll 70. As a result, the rubber material (the rubber material of the hollow portion 58) that covers the end surface 68 of the cored bar 22 is cut off. Since the rubber roll portion 56 is gripped by the grip portion 66 of the grip member 64 before the vulcanization process is performed, a mark of the grip portion 66 remains on the rubber roll portion 56 after the vulcanization process. However, since the portion with the mark in the rubber roll portion 56 is included in the rubber material at the both ends to be cut (cut off together with the rubber material at both ends), the mark remains on the rubber roll of the final product. There is no.

  FIG. 10 shows a configuration of a rubber roll 100 which is not a bag-like shape as a comparative example for the rubber roll 70 formed using the rubber roll manufacturing apparatus according to the present invention (no rubber material on the end face of the core metal). The rubber roll 100 as a comparative example is obtained without operating the pressing machine 14 and the drawing machine 16 in the rubber roll manufacturing apparatus 10, and is separated along the end face 68 of the core bar 22 with a separate blade (not shown). It is obtained. Therefore, the rubber roll 100 does not have a portion corresponding to the hollow portion 58.

  As shown in FIG. 10, in the rubber roll 100 as a comparative example, the thickness of the rubber material at the end portion is larger than the thickness of the rubber material at the center portion. This is due to the following reason.

  That is, although the residual stress is inherent in the rubber material discharged from the discharger 12, if the rubber material is separated after being discharged from the discharger 12, the rubber material near the end face 68 of the cored bar 22 is released by releasing the residual stress. Is contracted and deformed in the axial direction and expanded and deformed in the radial direction. Due to the deformation of the rubber material at the end portion, the thickness of the rubber material at the end portion of the rubber roll 100 increases as compared with the central portion. Therefore, if there is little area where the rubber material at the end of the rubber roll 100 is cut off in the subsequent processing, the rubber roll 100 having a large thickness unevenness at the end and the center is manufactured.

  On the other hand, in the rubber roll 70 molded using the rubber roll manufacturing apparatus 10 according to the present invention, the rubber material of the hollow portion 58 is pressed by the pressing machine 14, and the core metal 22 is formed into a bag-like shape by the rubber material of the hollow portion 58. Are cut off, that is, in a state where at least the peripheral edge of the end face 68 of the metal core 22 is covered with the rubber material of the hollow portion 58, the axial deformation of the rubber material due to the release of the residual stress and the radial expansion. Deformation is suppressed (see FIG. 9). Since the rubber material of the hollow portion 58 is cut after being vulcanized and cured by vulcanization treatment, the axial shrinkage deformation and the radial expansion deformation of the rubber material due to the release of the residual stress are substantially free of problems. Decrease. Therefore, the rubber roll 70 with small thickness unevenness is produced at both ends and the center.

  Further, in the rubber roll manufacturing apparatus 10, the drawing speed V3 of the rubber roll portion 56 from the discharging machine 12 by the drawing machine 16 is a constant speed within a range of 0.6 times to 1.4 times the rubber material pushing speed V2. Even when it is not set, the thickness of the rubber material at the end increases compared to the thickness of the rubber material at the center. The reason is as follows.

  That is, in the rubber roll manufacturing apparatus 10, if the drawing speed V3 of the rubber roll portion 56 from the discharging machine 12 by the drawing machine 16 is less than 0.6 times the rubber material pushing speed V2, as shown in FIG. In the basin 48, the amount of the rubber material flowing into the gap between the core bars 22 increases. And if the back metal core 22 is sent out to the merge area 48 in a state where the rubber material flowing into the gap between the core bars 22 in the merge area 48 increases, the pressure acting on the rubber material in the merge area 48 increases. Since the pressure of the rubber material in the merge region 48 once increased does not immediately decrease, the rubber material coated on the end portion of the rear core metal 22 has a large residual stress. Since the residual stress is released when discharged from the discharger 12, the thickness of the rubber material at the end increases as compared with the thickness of the rubber material at the center.

  On the contrary, in the rubber roll manufacturing apparatus 10, when the drawing speed V3 of the rubber roll portion 56 from the discharging machine 12 by the drawing machine 16 exceeds 1.4 times the pushing speed V2 of the rubber material, as shown in FIG. When the thickness of the rubber material of the hollow portion 58 in the merging region 48 is reduced and the rubber material of the hollow portion 58 is pressed inward by the pressing machine 14, the amount of the rubber material covering the end face 68 of the cored bar 22 is reduced. It becomes. When the amount of the rubber material covering the end face 68 of the core metal 22 is reduced, the effectiveness of suppressing the axial contraction deformation and the radial expansion deformation of the rubber material due to the release of the residual stress also decreases. Therefore, the thickness of the rubber material at the end portion increases as compared with the thickness of the rubber material at the central portion. In addition, the force acting in the axial direction is instantaneously excessive, and the rubber material may break in the middle of being pulled out, and there may be a situation in which the force for stretching does not act at all.

  In the rubber roll manufacturing apparatus 10, the drawing speed V3 of the rubber roll portion 56 from the discharging machine 12 by the drawing machine 16 is set to a constant speed in the range of 0.6 to 1.4 times the rubber material pushing speed V2. When the outer diameter expansion was evaluated at the end of the case and the case where the constant speed outside the range of 0.6 times or more and 1.4 times or less was evaluated, it was 0.6 times or more and 1.4 times or less. The outer diameter expansion of the end of the rubber roll 70 when set to a constant speed within the range was good at 20 μm, but the end when set to a constant speed outside the range of 0.6 times or more and 1.4 times or less The outer diameter expansion was poor at 100 μm.

  The evaluation of the outer diameter expansion at the end of the rubber roll 70 was performed by forming a rubber layer of 2 mm on the core metal 22 having a length of 355 mm and a diameter of 8 mm, performing vulcanization, and then starting from the end surface 68 of the core metal 22. The rubber layer is cut off at a position of 15 mm to expose the cored bar 22 at both ends, and supports and rotates one end of the cored bar 22, and an average outer diameter of 20 mm from the end surface 68 of the cored bar 22 and a position of 50 mm This was done by measuring the average outer diameter and determining the difference. For the outer diameter measurement, a light-shielded laser outer diameter measuring device (manufactured by Asaka Riken: ROLL2000) was used.

  Thus, the drawer 16 is operated in the rubber roll manufacturing apparatus 10 so that the thickness of the rubber material in the hollow portion 58 is approximately the same as the thickness of the rubber material in the rubber roll portion 56 (the thickness of the rubber material in the hollow portion 58 is the rubber roll portion). In the rubber roll 70 formed by pulling out the rubber roll portion 56 from the discharger 12 so that the thickness of the rubber material 56 is 90% or more and 110% or less with respect to the thickness of the rubber material 56, an increase in the thickness of the rubber material at the end portion is suppressed. Was found to be.

  As described above, in the rubber roll manufacturing apparatus 10 according to the present embodiment, the core metal 22 is sequentially fed to the center of the unvulcanized rubber material extruded in a cylindrical shape at intervals, and the metal core 22 is made of rubber. The discharger 12 alternately discharges the rubber roll part 56 covered with the outer peripheral surface and the hollow part 58 in which the space between the metal cores 22 is made of a rubber material, and the hollow part 58 discharged from the discharger 12. A pressing device 14 is provided that presses the rubber material in the hollow portion 58 inward so that at least the peripheral edge portion of the end surface 68 of the core metal 22 is covered with the rubber material. Therefore, deformation of the unvulcanized rubber material at the end of the rubber roll 70 is suppressed.

  Further, the drawer 16 is provided to draw out the rubber roll portion 56 discharged from the discharger 12 from the discharger 12 so that the thickness of the rubber material of the hollow portion 58 is within a predetermined range. Therefore, an increase in the thickness of the rubber material at the end of the rubber roll 70 is suppressed.

  Further, the drawing speed of the rubber roll portion 56 by the drawing machine 16 is set in a range of 0.6 times or more and 1.4 times or less with respect to the pushing speed of the rubber material. Accordingly, the thickness of the rubber material of the hollow portion 58 can be accurately set within a predetermined range.

  Further, in the rubber roll manufacturing method according to the present embodiment, the rubber bar manufacturing apparatus 10 is used to sequentially feed the metal core 22 at intervals to the center portion of the unvulcanized rubber material extruded into a cylindrical shape. Then, the rubber roll portion 56 in which the outer peripheral surface of the metal core 22 is coated and the hollow portion 58 in which the space between the metal cores 22 is made hollow by a rubber material are alternately discharged. A rubber roll forming step of forming the rubber roll 70 by pressing the rubber material of the hollow portion 58 inward so that at least the peripheral portion of the end face 68 is covered, and the rubber roll portion 56 and the rubber material of the hollow portion 58 are added to the rubber material. A vulcanization treatment step for performing a vulcanization treatment, and a processing treatment step for cutting away the rubber material after vulcanization of at least the hollow portion 58. Therefore, the rubber roll 70 in which the uneven thickness of the rubber material is suppressed is manufactured.

In the rubber roll manufacturing apparatus 10 described above, the rubber roll 70 is separated by the hollow portion 58 by the pressing device 14. However, after the rubber material of the hollow portion 58 is pressed inward by the pressing device 14, a separate cutter is used. You may comprise so that the rubber roll 70 may be isolate | separated by.
Further, in the above-described embodiment, the rubber material using epichlorohydrin rubber is exemplified, but the present invention is not limited to this, and other rubber materials may be used.
Further, in the above-described embodiment, the entire end surface 68 of the cored bar 22 is covered with the rubber material of the hollow part 58 in the form of a bag, but at least the peripheral part of the end surface 68 of the cored bar 22 is hollow. What is necessary is just to be covered with the rubber material of the part 58. FIG.

DESCRIPTION OF SYMBOLS 10 Rubber roll manufacturing apparatus 12 Discharge machine 14 Press machine 16 Drawer 18 Rubber material supply part 20 Extrusion part 22 Core metal 24 Core metal supply part 36 Mandrel 38 Discharge head 56 Rubber roll part 58 Hollow part 60 Press member 62 Press part 64 Holding member 66 Grip part 68 End face

Claims (4)

A core metal is sequentially fed into the center of an unvulcanized rubber material extruded into a cylindrical shape at intervals, and a rubber roll portion in which an outer peripheral surface of the metal core is covered with the rubber material, and the core metal with the rubber material A discharger that alternately discharges hollow portions that are hollow between,
A pressing machine that presses the rubber material in the hollow portion inward so that at least a peripheral edge portion of an end surface of the metal core is covered with the rubber material in the hollow portion discharged from the discharge device;
A rubber roll manufacturing apparatus comprising:   Furthermore, the drawer | drawing-out machine which pulls out the said rubber roll part discharged | emitted from the said discharger from the said discharger so that the thickness of the said rubber material of the said hollow part may become in the predetermined range. Rubber roll manufacturing equipment.   The rubber roll manufacturing apparatus according to claim 2, wherein a drawing speed of the rubber roll portion by the drawing machine is set in a range of 0.6 to 1.4 times the pushing speed of the rubber material. Using the rubber roll manufacturing apparatus according to any one of claims 1 to 3, a metal core is sequentially fed into a central portion of an unvulcanized rubber material extruded into a cylindrical shape at intervals, and the core is made of the rubber material. The rubber roll portion covered with the outer peripheral surface of the gold and the hollow portion in which the space between the metal cores is made hollow by the rubber material are alternately discharged, and at least the end surface of the metal core is discharged by the rubber material of the hollow portion. A first step of pressing the rubber material in the hollow portion inward so that the peripheral edge portion is covered;
A second step of vulcanizing the rubber material of the rubber roll part and the hollow part;
A third step of excising the rubber material after vulcanization of the hollow part;
A rubber roll manufacturing method comprising: