JP5928622B1 - Rubber roll manufacturing apparatus and rubber roll manufacturing method - Google Patents

Abstract

A rubber roll manufacturing apparatus and a rubber roll manufacturing method capable of suppressing a variation in the outer diameter of a rubber roll as compared with a case where a metal core is passed through a through hole extending in the vertical direction along the vertical direction. . A metal core 22 passing through a passage hole 46 and an inner peripheral surface 46A of the passage hole 46 are in contact with each other. Thereby, since it suppresses that the metal core 22 which passes the passage hole 46 shakes in a horizontal direction, it is suppressed that the outer diameter of the rubber material coat | covered with the metal core 22 varies. [Selection] Figure 4

Description

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

  The rubber roll manufacturing apparatus described in Patent Literature 1 includes a guide mechanism that moves a cored bar through the center of a circular opening in the extrusion direction of the rubber material and coats the cored bar with the rubber material. In this guide mechanism, the cored bar is moved in the pushing direction of the rubber material by at least two rotating bodies arranged around the cored bar.

JP 2005-254561 A

  Here, there is a constant clearance (clearance) over the entire circumference of the cored bar between the inner peripheral surface of the circular opening (passing hole) having a circular cross section and extending in the vertical direction and the cored bar passing through the circular opening. Exists. For this reason, the metal core passing through the circular opening may sway in the horizontal direction. Due to this shaking, the outer diameter of the rubber material coated on the core metal varies.

  The subject of this invention is suppressing the outer diameter of a rubber roll varying compared with the case where a metal core is passed along the vertical direction through the through-hole extended in a vertical direction.

Apparatus for producing a rubber roll according to claim 1, cross-section a core metal conveying unit for sequentially conveying the metal core to a vertically downward side, said core metal is transported inclined with respect to the to the both vertical passage A circular passage hole is formed, and an unvulcanized rubber material is extruded into a cylindrical shape, and an extrusion portion that covers the rubber material on the core metal that has passed through the passage hole is provided.

  The rubber roll manufacturing apparatus according to claim 2 is the rubber roll manufacturing apparatus according to claim 1, wherein the cored bar passing through the passage hole is in contact with an inner peripheral surface of the passage hole. Is inclined.

  A rubber roll manufacturing apparatus according to a third aspect is the rubber roll manufacturing apparatus according to the second aspect, wherein the core metal covered with the rubber material by the extruding portion is sandwiched between a pair of separating members to be covered with the rubber material. A separating portion that separates the leading metal core and the rear metal core coated with a rubber material, and the core metal and the rubber material coated with the rubber material are covered by the separating portion; The separation position for separating the rear metal core is shifted from the center line of the passage hole so that the separation member presses the rear metal core to the inner peripheral surface of the passage hole. Features.

  According to a fourth aspect of the present invention, there is provided a method for producing a rubber roll, wherein the cored bar is sequentially conveyed to the lower side in the vertical direction, passed through a circular passage hole inclined with respect to the vertical direction, and the unvulcanized rubber material is cylindrical. A first step of feeding the cored bar that has passed through the passage hole into a central part of a cylindrical rubber material and coating the cored bar with the rubber material, and the cored bar coated with the rubber material A second step of separating the front core metal and the rear core metal, a third step of performing a vulcanization process on the rubber material, and a vulcanized product coated on both ends of the core metal And a fourth step of cutting the rubber material.

  The method for producing a rubber roll according to claim 5 is the method for producing a rubber roll according to claim 4, wherein the passage hole through which the core metal passes in the first step is the core metal through which the passage hole passes. It is characterized by inclining so as to be in contact with the inner peripheral surface of the passage hole.

  The method for producing a rubber roll according to claim 6 is the method for producing a rubber roll according to claim 5, wherein in the second step, the separation position for separating the front core metal and the rear core metal is the rear one. The metal core is characterized by being displaced with respect to the center line of the passage hole so as to press the core metal against the inner peripheral surface of the passage hole.

  According to the rubber roll manufacturing apparatus of the first aspect, it is possible to suppress variation in the outer diameter of the rubber roll as compared with the case where the cored bar is passed through the passage hole extending in the vertical direction along the vertical direction.

  According to the rubber roll manufacturing apparatus of the second aspect, it is possible to suppress variation in the outer diameter of the rubber roll as compared with the case where the core metal passing through the passage hole does not contact the inner peripheral surface of the passage hole.

  According to the rubber roll manufacturing apparatus of the third aspect, it is possible to suppress variation in the outer diameter of the rubber roll as compared with the case where the separation position of the separation portion is located on the center line of the passage hole.

  According to the rubber roll manufacturing method of the fourth aspect, it is possible to suppress variation in the outer diameter of the rubber roll as compared with the case where the cored bar is passed through the passage hole extending in the vertical direction.

  According to the rubber roll manufacturing method of the fifth aspect, it is possible to suppress variation in the outer diameter of the rubber roll as compared to the case where the core metal passing through the passage hole does not contact the inner peripheral surface of the passage hole.

  According to the rubber roll manufacturing method of the sixth aspect, it is possible to suppress variation in the outer diameter of the rubber roll as compared with the case where the separation position of the separation portion is located on the center line of the passage hole.

It is the expanded sectional view which expanded the upper part of the press part in the manufacture device of the rubber roll concerning this embodiment. It is sectional drawing which showed the part below the press part, the separator, and the drawer in the manufacturing apparatus of the rubber roll which concerns on this embodiment. It is sectional drawing which showed the part below the press part, the separator, and the drawer in the manufacturing apparatus of the rubber roll which concerns on this embodiment. It is sectional drawing which showed the part below the press part, the separator, and the drawer in the manufacturing apparatus of the rubber roll which concerns on this embodiment. It is sectional drawing which showed the part below the press part, the separator, and the drawer in the manufacturing apparatus of the rubber roll which concerns on this embodiment. It is sectional drawing which showed the part below the press part, the separator, and the drawer in the manufacturing apparatus of the rubber roll which concerns on this embodiment. (A) (B) It is the expanded sectional view which showed the rubber roll manufactured by the manufacturing apparatus of the rubber roll which concerns on this embodiment, and the rubber roll manufactured by the manufacturing apparatus of the rubber roll which concerns on a comparison form. (A) (B) (C) It is the operation | movement figure which showed operation | movement of the cutting machine with which the manufacturing apparatus of the rubber roll which concerns on this embodiment was equipped. It is the block diagram which showed the manufacturing apparatus of the rubber roll which concerns on embodiment of this invention.

  An example of a rubber roll manufacturing apparatus and a rubber roll manufacturing method according to an embodiment of the present invention will be described with reference to FIGS. Note that an arrow H shown in the figure indicates the vertical direction of the apparatus (vertical direction), and an arrow W indicates the width direction of the apparatus (horizontal direction).

(overall structure)
The rubber roll 70 (see FIG. 8C) manufactured by the rubber roll manufacturing apparatus and the rubber roll manufacturing method according to the present embodiment is in contact with the photosensitive drum of an electrophotographic image forming apparatus, for example, and driven rotation. It is used as a charging roll for charging the photosensitive drum. In order to suppress variation in charging of the photosensitive drum, variation in the outer diameter of the rubber roll 70 needs to be within a predetermined allowable range.

  As shown in FIG. 9, the rubber roll manufacturing apparatus 10 according to this embodiment includes an extruder 12 formed of a so-called crosshead die and a separation as an example of a separation unit disposed on the lower side of the extruder 12. And a drawer 16 disposed on the lower side of the separator 14. Furthermore, the rubber roll manufacturing apparatus 10 includes a cutting machine 80 (see FIG. 8A).

(Extruder)
The extruder 12 includes a rubber material supply unit 18 that supplies an 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 conveying part 24 for supplying the metal core 22 to the central part of the rubber material.

[Rubber supply section]
The rubber material supply unit 18 is disposed on the right side of the main body 26 in the figure, a screw 28 disposed inside the cylindrical main body 26, a heater (not shown) for heating the rubber material in the main body 26. And a drive motor 30 that rotationally drives the screw 28. Further, a charging port 32 for charging a rubber material is arranged on the drive motor 30 side of the main body 26.

  In this configuration, the rubber material input from the input port 32 is sent out toward the extrusion portion 20 while being kneaded by the screw 28 inside the main body portion 26.

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

[Extruded part]
The extrusion unit 20 includes a cylindrical case 34 connected to the rubber material supply unit 18, a columnar mandrel 36 disposed inside the case 34, and a discharge head 38 disposed below the mandrel 36. I have. The mandrel 36 is held in the case 34 by a holding member 40, and the discharge head 38 is held in the case 34 by a holding member 42. A rubber material flows annularly 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 channel 44 is formed.

  A passage hole 46 through which the core bar 22 is inserted is formed at the center of the mandrel 36. On the other hand, the lower part of the mandrel 36 has a tapered shape toward the tip. A region below the tip of the mandrel 36 is a joining region 48 where the cored bar 22 supplied from the passage 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. Details of the passage hole 46 will be described later.

[Core metal transport section]
The cored bar transport unit 24 includes a pair of rollers 50 disposed above the mandrel 36. A plurality of pairs (for example, three pairs) of roller pairs 50 are provided, and a roller on one side (left side in the figure) 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 sandwiched between the roller pairs 50 is conveyed toward the passage 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 passage hole 46 of the mandrel 36, whereby a plurality of core bars 22 are formed. 22 sequentially pass through the passage hole 46.

  In this configuration, the cored bar transport unit 24 transports the cored bar 22 downward in the vertical direction, and driving of the drive roller 54 is temporarily stopped when the tip of the preceding cored bar 22 reaches the tip of the mandrel 36. (See FIG. 2). Then, the rubber material is extruded into a cylindrical shape in the merging region 48, and the core metal 22 is sequentially fed into the central portion of the rubber material with an interval. Accordingly, a rubber roll portion 56 in which the outer peripheral surface of the metal core 22 is covered with a rubber material, and a hollow portion 58 as an example of an intermediate portion in which the inside of the rubber material is hollow between the metal core 22 and the metal core 22, Are alternately discharged from the discharge head 38. 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.

〔Separator〕
The separator 14 includes a pair of semi-cylindrical separating members 60. The pair of separation members 60 are disposed to face each other so as to sandwich the rubber roll portion 56 discharged from the extruder 12. Each separation member 60 is formed with a protrusion 62 that protrudes toward the center. Each separating member 60 is moved in the left-right direction in the drawing by a driving mechanism (not shown) to separate the front rubber roll portion 56 and the rear rubber roll portion 56. As a result, a rubber roll body 74 (see FIG. 6) is formed in which the core metal 22 on the front side has a bag-like shape.

  The separation position of the separator 14 with respect to the rubber roll unit 56 will be described in detail later.

[Drawer]
The drawer 16 has a pair of semi-cylindrical gripping members 64. The pair of gripping members 64 are disposed to face each other so as to sandwich the rubber roll portion 56 discharged from the extruder 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).

[Resecting machine]
As shown in FIG. 8A, the excision machine 80 includes a pair of gripping members 82 that grip the rubber roll body 74 at both ends of the rubber roll body 74 and a pair of cutters 84. The gripping member 82 rotates the gripped rubber roll body 74 in the circumferential direction of the rubber roll body 74, and the cutter 84 moves in a direction approaching and separating from the gripped rubber roll body 74. .

  In this configuration, the excision machine 80 excises the rubber material after vulcanization of the portion covering the end face 68 of the core metal 22 (see FIGS. 8B and 8C).

(Operation of the overall configuration)
Next, a manufacturing method for manufacturing the rubber roll 70 using the rubber roll manufacturing apparatus 10 will be described.

  As shown in FIG. 9, the rubber material introduced into the insertion port 32 of the rubber material supply unit 18 is heated by a heater (not shown) inside the main body 26 and is kneaded by the rotating screw 28 while being extruded. It is sent out toward.

  The rubber material fed from the rubber material supply unit 18 to the extrusion unit 20 and supplied to the extrusion unit 20 can be annularly formed in an annular flow path 44 formed inside the extrusion unit 20. The rubber material flowing through the annular flow path 44 flows toward the joining area 48 and is pushed out as a cylindrical rubber member 72 in the joining area 48.

  On the other hand, the cored bar 22 is supplied to the passage hole 46 of the mandrel 36 by the cored bar transport unit 24. The rear cored bar 22 supplied by the roller pair 50 of the cored bar transport unit 24 presses the previous cored bar 22 existing in the passage hole 46 of the mandrel 36, so that the previous cored bar 22 is joined to the joining area 48. Is fed into the center of the rubber member 72 extruded in a cylindrical shape. As a result, the rubber roll portion 56 whose outer peripheral surface of the cored bar 22 is covered with the rubber member 72 is discharged from the discharge head 38 (first step).

  Here, as shown in FIG. 2, when the tip of the rear core metal 22 reaches the tip of the mandrel 36 and the rear core metal 22 stops, the gripping members 64 are moved in a direction approaching each other. The rubber roll portion 56 is gripped by the 64 gripping portions 66.

  Then, as shown in FIG. 3, each gripping member 64 moves downward while gripping the rubber roll portion 56. That is, the rubber roll portion 56 is pulled out from the extruder 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 inside of the rubber material was made hollow will be formed. Each gripping member 64 moves downward by an appropriate distance while gripping the separated rubber roll body 74, and is indicated by a virtual line (two-dot chain line) in FIG. 2 as a standby position for gripping the next rubber roll portion 56. Move to position.

  Further, the feeding of the cored bar 22 is resumed, and the hollow portion 58 moves to a position where the pair of separating members 60 are opposed, as shown in FIG. And when the hollow part 58 moves to the opposing position of a pair of separation member 60, as FIG. 5 shows, each separation member 60 is moved at the same speed in the direction which mutually approaches, and the rubber material of the hollow part 58 Is pressed inward by the protrusions 62 of the separation members 60. Thereby, the end surface 68 of the front metal core 22 and the end surface 68 of the rear metal core 22 are covered with the rubber material.

  Further, as shown in FIG. 6, each separation member 60 is movable in a direction away from each other, separated into a front rubber roll portion 56 and a rear rubber roll portion 56, and the rubber roll body in which the cored bar 22 is shaped like a bag. 74 is formed (second step).

  The bag-bound rubber roll body 74 is placed in a vulcanization furnace. Thereby, a vulcanization process is performed on the rubber material covering the cored bar 22 (third step).

  Further, the rubber material at both ends is cut so that the cored bar 22 is exposed for a certain length at the both ends of the vulcanized rubber roll body 74 (fourth step).

  Specifically, as shown in FIG. 8A, the pair of gripping members 82 grips the rubber roll body 74 in a state where the cutter 84 is disposed at a distance from the rubber roll body 74. Further, as shown in FIG. 8B, the cutter 84 moves to a position close to the rubber roll body 74, and the gripping member 82 rotates the rubber roll body 74 (see the arrow in the figure). As a result, as shown in FIG. 8C, the rubber material covering the end surface 68 of the core metal 22 is cut off, and the rubber roll 70 is manufactured.

  In addition, about the reason for making the cored bar 22 into a bag-like shape, compared to the case where the rubber material at both ends of the cored bar 22 is opened, the cored bar generated when the rubber material is vulcanized. This is because the deformation of the rubber material at both end portions of 22 is suppressed.

(Main part configuration)
Next, the separation position of the rubber roll part 56 by the passage hole 46 formed in the mandrel 36 of the extrusion part 20 and the separator 14 will be described.

  The inner diameter of the passage hole 46 formed in the mandrel 36 is slightly larger than the outer diameter of the cored bar 22 so that the cored bar 22 passes through. This is because when the inner diameter of the passage hole 46 is narrower than the outer diameter of the cored bar 22 or the same diameter, the primer applied to the cored bar is peeled off and the shape deteriorates. This is because 22 is clogged in the passage hole. The clearance is desirably 30 to 50 μm. Further, the passage hole 46 is inclined with respect to the direction (vertical direction) in which the core metal 22 is transported by the core metal transport unit 24. Specifically, as shown in FIG. 1, the center line C1 of the cored bar 22 conveyed from the cored bar conveying unit 24 and the centerline C2 of the passage hole 46 are the inlet (point D in the figure) of the extrusion unit 20. The passage hole 46 is inclined with respect to the vertical direction so as to intersect with each other. In addition, the inclination degree of the passage hole 46 shown in each drawing is exaggerated so that it can be easily understood that the passage hole 46 is inclined.

  In this embodiment, as an example, the cored bar 22 has a cylindrical shape with a total length of 354.5 [mm] and an outer diameter of 8.0 [mm], and the passage hole 46 has an inner diameter of 8.05 [mm]. It is said that. In addition, the length (L dimension in FIG. 9) from the inlet of the extrusion unit 20 to the tip of the mandrel 36 is 324.0 [mm], and the inclination of the passage hole 46 with respect to the vertical direction is 30/10000. ing.

  In this configuration, the lower end of the cored bar 22 passing through the passage hole 46 and the inner wall of the inner peripheral surface 46A of the passage hole 46 are in contact with each other. In addition, after the lower end of the cored bar 22 has passed through the passage hole 46, the outer peripheral surface of the cored bar 22 and the lower end of the inner peripheral surface 46 </ b> A of the passing hole 46 come into contact with each other.

  In this embodiment, in order to incline the passage hole 46 formed in the mandrel 36, the entire extruded portion 20 is inclined.

  Further, as a direction for measuring the inclination of the passage hole 46 with respect to the vertical direction, the front end side of a cylindrical jig that contacts the entire inner peripheral surface 46A of the passage hole 46 is inserted, and the rear end side of the jig Is measured using a measuring machine, whereby the inclination of the passage hole 46 is measured.

  On the other hand, as for the separation position of the rubber roll portion 56 by the separator 14, it passes so as to press the core metal 22 discharged from the discharge head 38 against the inner peripheral surface 46 </ b> A (end portion of the inner peripheral surface 46 </ b> A) of the passage hole 46. The center line C2 of the hole 46 is displaced.

  Here, the separation position S of the separator 14 means that when the front rubber roll portion 56 and the rear rubber roll portion 56 are separated, the tip ends of the protrusions 62 formed on the pair of separation members 60 come into contact with each other. Position.

  Specifically, as shown in FIGS. 4 and 5, the separation position S of the separator 14 is such that the inclined rubber roll portion 56 (core metal 22) discharged from the discharge head 38 faces in the vertical direction. , The center line C2 of the passage hole 46 is displaced. In the present embodiment, as an example, the shift amount (M dimension in FIG. 4) is 0.3 [mm]. That is, the timing of pressing the rubber roll portion 56 is shifted between the one separating member 60 and the other separating member 60.

  In this configuration, when the front rubber roll portion 56 and the rear rubber roll portion 56 are separated by the separator 14, the rear (discharged) core metal 22 is disposed on the inner peripheral surface of the passage hole 46 (K portion in FIG. 5). ).

(Effects of main components)
Next, the operation of the main part configuration will be described in comparison with a rubber roll manufacturing apparatus according to a comparison mode with respect to the present embodiment.

  First, the manufacturing apparatus of the rubber roll which concerns on a comparison form is demonstrated. About the rubber roll manufacturing apparatus which concerns on a comparison form, a different part from the rubber roll manufacturing apparatus 10 which concerns mainly on this embodiment is mainly demonstrated.

  The center line of the passage hole of the rubber roll manufacturing apparatus according to the comparative embodiment is not inclined with respect to the vertical direction, and is the same as the center line C1 of the cored bar 22 conveyed from the cored bar conveying unit 24 in the vertical direction. It extends. For this reason, when the cored bar 22 passes through the passage hole, there is a certain gap over the outer periphery of the cored bar 22 between the cored bar 22 and the inner peripheral surface of the passing hole.

  Moreover, the separation position of the separator of the rubber roll manufacturing apparatus according to the comparative embodiment is located on the center line of the passage hole. For this reason, when it isolate | separates into the front rubber roll part 56 and the back rubber roll part 56 with a separator, the back (discharge) core metal 22 is prevented from being pressed to the internal peripheral surface of a passage hole.

  As described above, in the rubber roll manufacturing apparatus according to the comparative embodiment, when the core bar 22 passes through the passage hole, the outer periphery of the core bar 22 is interposed between the core bar 22 and the inner peripheral surface of the passage hole. There is a certain gap across. For this reason, the cored bar 22 passing through the passage hole is shaken in the horizontal direction by being pressed from the rubber material. Due to this shaking, the outer diameter of the rubber material covered by the cored bar 22 varies.

  On the other hand, the passage hole 46 of the rubber roll manufacturing apparatus 10 according to the present embodiment is inclined with respect to the direction (vertical direction) in which the core metal 22 is transported by the core metal transport unit 24. For this reason, as described above, the cored bar 22 passing through the passage hole 46 and the wall surface of the inner peripheral surface 46A of the passage hole 46 come into contact with each other.

  The separation position S of the separator 14 is such that when the front rubber roll portion 56 and the rear rubber roll portion 56 are separated, the rear (discharged) cored bar 22 is the lower end of the inner peripheral surface 46 </ b> A of the passage hole 46. It is shifted with respect to the center line C2 of the passage hole 46 so as to be pressed (K portion in FIGS. 4 and 5). That is, when the front rubber roll portion 56 and the rear rubber roll portion 56 are separated by the separator 14, the rear core metal 22 is pressed against the inner peripheral surface 46 </ b> A of the passage hole 46.

(Summary)
As described above, in the rubber roll manufacturing apparatus 10 of this embodiment, the cored bar 22 passing through the passage hole 46 and the inner peripheral surface 46A of the passage hole 46 are in contact with each other. Thereby, since it suppresses that the core metal 22 which passes the passage hole 46 shakes in a horizontal direction, it suppresses that the outer diameter of the rubber material coat | covered with the core metal 22 varies compared with a comparison form. Is done.

  Specifically, in the rubber roll 70 manufactured by the rubber roll manufacturing apparatus according to the comparative embodiment, the cored bar 22 sways in the horizontal direction, and therefore, as shown in FIG. It varies in the direction (left and right direction in the figure). On the other hand, in the rubber roll 70 manufactured by the rubber roll manufacturing apparatus 10 according to the present embodiment, since the horizontal swing of the cored bar 22 is suppressed, as shown in FIG. It is suppressed that the outer diameter of each of the rolls varies in the roll axis direction.

  Further, in the rubber roll manufacturing apparatus 10 of the present embodiment, when the front rubber roll portion 56 and the rear rubber roll portion 56 are separated by the separator 14, the rear core metal 22 is placed on the inner peripheral surface 46 </ b> A of the passage hole 46. Press. As a result, when the separator 14 separates the front rubber roll portion 56 and the rear rubber roll portion 56, the core metal 22 is prevented from shaking in the horizontal direction. The variation in the outer diameter of the rubber material covered with 22 is suppressed.

  Although the present invention has been described in detail with respect to specific embodiments, the present invention is not limited to such embodiments, and various other embodiments can be taken within the scope of the present invention. This will be apparent to those skilled in the art. For example, in the above embodiment, the passage hole 46 is inclined with respect to the vertical direction so that the core metal 22 passing through the passage hole 46 and the inner peripheral surface 46A of the passage hole 46 are in contact with each other. The inner peripheral surface 46A of the passage hole 46 may not be in contact with the passage hole 46 as long as the passage hole 46 is inclined with respect to the vertical direction. Since the passage hole 46 is inclined with respect to the vertical direction, the horizontal swing width of the cored bar 22 is reduced as compared with the comparative embodiment.

  Moreover, in the said embodiment, although it was set as the hollow part 58 by which the inside of the rubber material was made hollow between the front metal core 22 and the back metal core 22, especially the front metal core 22 and the back metal core are made into the hollow part 58. The inside of the rubber material between the gold 22 may not be hollow.

  Moreover, in the said embodiment, in order to incline the passage hole 46, although the extrusion part 20 whole was inclined, you may incline only the passage hole 46. FIG.

10 Rubber Roll Manufacturing Equipment 14 Separator (Example of Separation Unit)
20 Extruding part 22 Core metal 24 Core metal conveying part 46 Passing hole 60 Separating member

Claims (6)

A cored bar transport unit for sequentially transporting the cored bar downward in the vertical direction;
When the core metal being conveyed passes are both circular in cross section passing holes are inclined with respect to the vertical direction is formed, the core metal of the unvulcanized rubber material extruded into a cylindrical shape, passing through the passage hole An extrusion part for covering the rubber material with
A rubber roll manufacturing apparatus comprising:   The rubber roll manufacturing apparatus according to claim 1, wherein the passage hole is inclined so that the core metal passing through the passage hole is in contact with an inner peripheral surface of the passage hole. The core metal covered with the rubber material by the extruding portion is sandwiched between a pair of separating members and separated into the front metal core covered with the rubber material and the rear metal core covered with the rubber material. With a separation part,
The separation position at which the separation core separates the core metal covered with the rubber material and the back metal core covered with the rubber material is such that the separation member separates the back metal core in the passage hole. The apparatus for manufacturing a rubber roll according to claim 2, wherein the apparatus is displaced with respect to the center line of the passage hole so as to press against the peripheral surface. The mandrel is sequentially conveyed downward in the vertical direction to pass through a circular cross-sectional passage hole inclined with respect to the vertical direction, the unvulcanized rubber material is extruded into a cylindrical shape, and passes through the through hole. A first step of feeding the cored bar to the center of a cylindrical rubber material and coating the cored bar with the rubber material;
A second step of separating the core metal covered with the rubber material into the core metal at the front and the core metal at the rear;
A third step of vulcanizing the rubber material;
A fourth step of cutting off the vulcanized rubber material coated on both ends of the core;
A method for producing a rubber roll comprising:   5. The rubber roll according to claim 4, wherein the passage hole through which the metal core passes in the first step is inclined so that the metal core that passes through the passage hole comes into contact with an inner peripheral surface of the passage hole. Production method.   In the second step, the separation position for separating the front metal core and the rear metal core is the center line of the passage hole so that the rear metal core is pressed against the inner peripheral surface of the passage hole. The manufacturing method of the rubber roll of Claim 5 which has shifted | deviated with respect to.