JP6464828B2 - Method for manufacturing tubular body covering member - Google Patents

Description

  The present invention relates to a method for manufacturing a tubular body covering member.

  Forming method of fluororesin coating layer in which the fluororesin layer is formed in a very thin state without air bubbles mixing between the fluororesin tube and the roller base material when the fluororesin tube is in close contact with the coating A fluororesin-coated roller has been conventionally known (for example, see Patent Document 1).

JP 2004-223963 A

  In the present invention, the tubular member at the end portion in the axial direction excluding the shaft portion of the member is compared with the case where the cylindrical member is not attached to the shaft portion of the member before the tubular member is coated on the columnar or cylindrical member by heat shrinkage. It aims at obtaining the manufacturing method of the tubular body covering member which can improve the position accuracy of a body.

  In order to achieve the above object, a method of manufacturing a tubular body covering member according to claim 1 according to the present invention is provided at an end portion of a cylindrical or cylindrical member and has a shaft portion having a smaller diameter than the end portion. A step of attaching a cylindrical body having an outer diameter equal to that of the member in contact with the end portion, covering the tubular body on the member including the cylindrical body, and heating and shrinking the tubular body And a step of cutting the tubular body at a boundary portion between the cylindrical body and the member.

  Moreover, the manufacturing method of the tubular body coating | coated member of Claim 2 is a manufacturing method of the tubular body coating | coated member of Claim 1, Comprising: It protrudes to the radial direction outer side in the axial direction middle part of the said cylindrical body. At least one projecting portion is formed continuously in the circumferential direction, and in the step of heating and shrinking the tubular body, the tubular body is covered with the member including the projecting portion.

  Moreover, the manufacturing method of the tubular body coating | coated member of Claim 3 is a manufacturing method of the tubular body coating | coated member of Claim 2, Comprising: The outer peripheral surface of the said protrusion part is made into the cylindrical surface.

  According to the first aspect of the present invention, before the cylindrical body is coated on the columnar or cylindrical member by thermal contraction, the shaft portion of the member is less than the case where the cylindrical body is not attached to the shaft portion of the member. It is possible to improve the positional accuracy of the tubular body at the excluding axial ends.

  According to the second aspect of the present invention, in the step of heat-shrinking the tubular body, the tubular body has an axial end of the member as compared with the case where the tubular body is not covered by including the protruding portion formed in the cylindrical body. It can suppress that it shrinks to the axial direction center part side rather than a part.

  According to the third aspect of the present invention, the tubular body contracts to the axial direction central portion side rather than the axial end portion of the member as compared with the case where the outer peripheral surface of the protruding portion is not a cylindrical surface. This can be suppressed.

It is a perspective view showing a fixing roll manufactured by the manufacturing method according to the present embodiment. It is process drawing which shows the manufacturing method which concerns on 1st Embodiment in a partial cross section. It is process drawing which shows the manufacturing method which concerns on 2nd Embodiment. It is process drawing which shows the manufacturing method which concerns on 3rd Embodiment. It is a partial process figure which shows the manufacturing method which concerns on 4th Embodiment.

  Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. For convenience of explanation, the arrow UP shown in FIGS. 2 to 5 may be described as an upward direction (upward in the axial direction), and “up” or “down” may be added as a reference. The direction of each part is not limited by the description to which "" or "below" is added.

  For convenience of explanation, FIGS. 2 to 5 illustrate only one side in the axial direction of the fixing roll 10 as an example of the tubular body covering member, but of course, the other side has the same configuration. . Furthermore, in the following, “side view” refers to viewing from a direction orthogonal to the vertical direction (axial direction) in FIGS.

(Fixing roll)
As shown in FIG. 1, the fixing roll 10 manufactured by the manufacturing method according to this embodiment includes a columnar (or cylindrical) rubber roll 12 as an example of a columnar or cylindrical member, and an example of a tubular body. The heat shrinkable fluororesin tube (hereinafter referred to as “resin tube”) 20 is covered.

  The rubber roll 12 is composed of a roll main body 14 formed by forming a rubber layer 18 on a cylindrical core metal 16, and both axial ends of the core metal 16 protruding in the axial direction from the rubber layer 18. And a shaft portion 15 having a smaller diameter than the main body 14. A cylindrical hole portion 15 </ b> A that opens outward in the axial direction is formed in the axial center portion of the shaft portion 15.

  The cored bar 16 is formed in a columnar shape with, for example, aluminum, iron, copper, stainless steel, or other metal or alloy. The rubber layer 18 is formed in a cylindrical shape from a rubber material such as silicone rubber or urethane rubber.

  The resin tube 20 is made of, for example, polytetrafluoroethylene resin (PTFE), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer resin (PFA), fluorinated ethylene-propylene copolymer resin (FEP), or polyvinylidene fluoride resin (PVDF). ), A polyvinyl fluoride resin or the like, and in this embodiment, PFA is used. In addition, the film thickness of the resin tube 20 is about 30 micrometers, for example.

(Manufacturing method according to the first embodiment)
Next, a manufacturing method according to the first embodiment of the fixing roll 10 configured as described above, that is, a method of manufacturing the fixing roll 10 by covering the rubber roll 12 with the resin tube 20 will be described.

  As shown in FIG. 2, when the rubber tube 12 is covered with the resin tube 20, a cylindrical body (cylindrical cap) 22 is used. Both ends in the axial direction of the cylindrical body 22 are opened, and the outer diameter of the cylindrical body 22 is the same as the outer diameter of the roll body 14. The inner diameter of the cylindrical body 22 is the same as the outer diameter of the shaft portion 15. The length of the cylindrical body 22 is equal to or longer than the length of the shaft portion 15. Hereinafter, each step will be described.

  First, as shown in FIG. 2A, the cylindrical body 22 is fitted and attached to the shaft portion 15 (attachment process). At this time, the lower end (axially inner end) 22A of the cylindrical body 22 is brought into contact with the upper end (axial end) 14A of the roll body 14. Then, the rubber roll 12 including the cylindrical body 22 is relatively inserted into the resin tube 20. At this time, the inner diameter of the resin tube 20 is larger than the outer diameters of the cylindrical body 22 and the rubber roll 12 (roll body 14).

  Next, the entire resin tube 20 in which the rubber roll 12 (including the cylindrical body 22) is inserted is heat-shrinked (heat-shrinking step). Thereby, as shown in FIG. 2B, the outer peripheral surface of the rubber roll 12 (roll body 14) and the outer peripheral surface of the cylindrical body 22 are covered with the resin tube 20. That is, the resin tube 20 is covered from the outer peripheral surface of the rubber roll 12 (roll body 14) to the outer peripheral surface of the cylindrical body 22.

  Here, by attaching the cylindrical body 22 to the shaft portion 15 of the rubber roll 12, the heat capacity of both ends of the rubber roll 12 in the axial direction (cylindrical body 22 side) becomes larger than the heat capacity of the rubber roll 12 on the axial center portion side. ing. Therefore, the temperature of the roll body 14 on the axial center side is higher than that of the axial end parts, and the resin tube 20 is covered from the axial center part side of the roll body 14 to the axial end parts side. To go.

  Thereby, the air bubbles existing between the outer peripheral surface of the roll main body 14 and the inner peripheral surface of the resin tube 20 move from the axial central portion side of the roll main body 14 to both axial end portions, and the lower end of the cylindrical body 22. The portion 22A and the upper end portion 14A of the roll body 14 move toward the inner peripheral surface side of the cylindrical body 22 through a minute gap at the boundary portion 28. And it exhausts outside through the micro clearance gap between the internal peripheral surface of the cylindrical body 22, and the outer peripheral surface of the axial part 15. FIG.

  Subsequently, as shown in FIG. 2C, the resin tube 20 is cut by a cutter 30 at a boundary portion 28 where the lower end portion 22A of the cylindrical body 22 and the upper end portion 14A of the roll body 14 are in contact ( Cutting step).

  For example, the cutter 30 is inserted between the lower end portion 22A of the cylindrical body 22 and the upper end portion 14A of the roll body 14 (the cutter 30 is inserted into the boundary portion 28), and then the rubber roll is fixed to the fixed cutter 30. By rotating 12, the resin tube 20 is cut along the circumferential direction at the boundary portion 28. Two cutters 30 are shown in FIG. 2C, but may be one.

  Then, as shown in FIG. 2D, the cylindrical body 22 whose upper surface (part) from the cut portion of the resin tube 20 is covered with the outer peripheral surface is removed from the rubber roll 12. Thereby, the fixing roll 10 in which the upper end portion 14A of the roll main body 14 and the upper end portion (axial end portion) 20A of the resin tube 20 covered with the roll main body 14 are aligned is manufactured.

  Here, if the resin tube 20 is thermally contracted on the roll body 14 of the rubber roll 12 without using the cylindrical body 22, the resin tube 20 is thermally contracted due to a step (edge) between the roll body 14 and the shaft portion 15. Sometimes cut off. In this case, the positional accuracy of the upper end portion 20A of the resin tube 20 in the upper end portion 14A of the roll body 14 is not ensured (the upper end portion 14A of the roll body 14 and the upper end portion 20A of the resin tube 20 covered by the roll body 14 are I do not have it.)

  However, in the manufacturing method according to the present embodiment, since the resin tube 20 is coated using the cylindrical body 22 having the same outer diameter as that of the rubber roll 12, the resin tube 20 is not used without using the cylindrical body 22. Compared with the case of covering, the positional accuracy of the upper end portion 20A of the resin tube 20 in the upper end portion 14A of the roll body 14 is improved.

  In addition, since the resin tube 20 adhering to the outer peripheral surface of the cylindrical body 22 is unnecessary after the cutting process, it is removed from the cylindrical body 22 in the next process. The cylindrical body 22 from which the unnecessary resin tube 20 is removed is attached to the shaft portion 15 of the next rubber roll 12 and reused.

(Manufacturing method according to the second embodiment)
Next, a manufacturing method according to the second embodiment of the fixing roll 10, that is, a method of manufacturing the fixing roll 10 by covering the rubber roll 12 with the resin tube 20 will be described. In addition, the same code | symbol is attached | subjected to the site | part equivalent to the said 1st Embodiment, and detailed description is abbreviate | omitted suitably.

  As shown in FIG. 3, in the second embodiment, one protruding portion 24 that protrudes radially outward continuously in the circumferential direction is formed at the central portion of the cylindrical body 22 in the axial direction. The protrusion 24 is formed so that the outer diameter of the central portion in the axial direction of the cylindrical body 22 is gradually larger than the outer diameters of the lower end portion 22A and the upper end portion (axial outer end portion) 22B. It is comprised as a corner | angular part (ridgeline part) used as an obtuse angle.

  The outer diameter of the lower end 22A of the cylindrical body 22 is the same as the outer diameter of the roll body 14. The inner diameter of the cylindrical body 22 is the same as the outer diameter of the shaft portion 15. Hereinafter, each step will be described.

  First, as shown in FIG. 3A, the cylindrical body 22 is fitted and attached to the shaft portion 15 (attachment process). At this time, the lower end portion 22 </ b> A of the cylindrical body 22 is brought into contact with the upper end portion 14 </ b> A of the roll body 14. Then, the rubber roll 12 including the cylindrical body 22 is relatively inserted into the resin tube 20. At this time, the inner diameter of the resin tube 20 is larger than the outer diameter of the protruding portion 24 of the cylindrical body 22.

  Next, the entire resin tube 20 in which the rubber roll 12 (including the cylindrical body 22) is inserted is heat-shrinked (heat-shrinking step). Thereby, as shown in FIG. 3B, the resin tube 20 is coated on the outer peripheral surface including the outer peripheral surface of the rubber roll 12 (roll main body 14) and the protruding portion 24 of the cylindrical body 22. That is, the resin tube 20 is covered from the outer peripheral surface of the rubber roll 12 (roll main body 14) to the outer peripheral surface including the protruding portion 24 of the cylindrical body 22.

  Here, since the volume of the cylindrical body 22 according to the second embodiment is larger than that of the cylindrical body 22 according to the first embodiment, it is a matter of course that the cylindrical body 22 on both ends in the axial direction of the rubber roll 12 (on the cylindrical body 22 side). The heat capacity is larger than the heat capacity of the rubber roll 12 at the axially central portion side. Therefore, the temperature of the roll body 14 on the axial center side is higher than that of the axial end parts, and the resin tube 20 is covered from the axial center part side of the roll body 14 to the axial end parts side. To go.

  Thereby, the air bubbles existing between the outer peripheral surface of the roll main body 14 and the inner peripheral surface of the resin tube 20 move from the axial central portion side of the roll main body 14 to both axial end portions, and the lower end of the cylindrical body 22. The portion 22A and the upper end portion 14A of the roll body 14 move toward the inner peripheral surface side of the cylindrical body 22 through a minute gap at the boundary portion 28. And it exhausts outside through the micro clearance gap between the internal peripheral surface of the cylindrical body 22, and the outer peripheral surface of the axial part 15. FIG.

  In addition, when the resin tube 20 is coated on the outer peripheral surface of the cylindrical body 22, the resin tube 20 is restricted from contracting toward the center in the axial direction by the protrusion 24. Therefore, the resin tube 20 contracts too much toward the axial center portion, and an upper end portion (axial end portion) 20B before the cutting step described later is present on the axial central portion side with respect to the upper end portion 14A of the roll body 14. Such a problem, that is, the problem that the outer peripheral surface of the roll main body 14 on the upper end portion 14A side is not covered with the resin tube 20, is suppressed or prevented as compared with the first embodiment.

  Subsequently, as shown in FIG. 3C, the resin tube 20 is cut by a cutter 30 at a boundary portion 28 where the lower end portion 22A of the cylindrical body 22 and the upper end portion 14A of the roll body 14 are in contact ( Cutting step).

  For example, as in the first embodiment, the cutter 30 is inserted between the lower end portion 22A of the cylindrical body 22 and the upper end portion 14A of the roll body 14 (the cutter 30 is inserted into the boundary portion 28), and then fixed. By rotating the rubber roll 12 with respect to the cutter 30, the resin tube 20 is cut along the circumferential direction at the boundary portion. Although two cutters 30 are shown in FIG. 3C, one cutter 30 may be used.

  Then, as shown in FIG. 3D, the cylindrical body 22 whose upper surface (part) from the cut portion of the resin tube 20 is covered with the outer peripheral surface is removed from the rubber roll 12. As a result, the fixing roll 10 in which the upper end portion 14A of the roll body 14 and the upper end portion 20A of the resin tube 20 covered with the roll body 14 are aligned is manufactured.

  That is, the positional accuracy of the upper end portion 20A of the resin tube 20 in the upper end portion 14A of the roll body 14 is compared with the case where the roll tube 14 of the rubber roll 12 is covered with the resin tube 20 by heat contraction without using the cylindrical body 22. Is improved.

  In addition, since the resin tube 20 adhering to the outer peripheral surface of the cylindrical body 22 is unnecessary after the cutting process, it is removed from the cylindrical body 22 in the next process. The cylindrical body 22 from which the unnecessary resin tube 20 is removed is attached to the shaft portion 15 of the next rubber roll 12 and reused.

(Manufacturing method according to the third embodiment)
Next, a manufacturing method according to the third embodiment of the fixing roll 10, that is, a method of manufacturing the fixing roll 10 by covering the rubber roll 12 with the resin tube 20 will be described. In addition, the same code | symbol is attached | subjected to the site | part equivalent to the said 1st and 2nd embodiment, and detailed description is abbreviate | omitted suitably.

  As shown in FIG. 4, in the third embodiment, one protrusion 26 that protrudes radially outward continuously in the circumferential direction is formed at the axially central portion of the cylindrical body 22. The protruding portion 26 is configured as a cylindrical surface 26A, and is formed such that the outer diameter of the cylindrical surface 26A gradually becomes larger than the outer diameters of the lower end portion 22A and the upper end portion 22B.

  The outer diameter of the lower end 22A of the cylindrical body 22 is the same as the outer diameter of the roll body 14. The inner diameter of the cylindrical body 22 is the same as the outer diameter of the shaft portion 15. Hereinafter, each step will be described.

  First, as shown in FIG. 4A, the cylindrical body 22 is fitted and attached to the shaft portion 15 (attachment process). At this time, the lower end portion 22 </ b> A of the cylindrical body 22 is brought into contact with the upper end portion 14 </ b> A of the roll body 14. Then, the rubber roll 12 including the cylindrical body 22 is relatively inserted into the resin tube 20. At this time, the inner diameter of the resin tube 20 is larger than the outer diameter of the protruding portion 26 of the cylindrical body 22.

  Next, the entire resin tube 20 in which the rubber roll 12 (including the cylindrical body 22) is inserted is heat-shrinked (heat-shrinking step). Thereby, as shown in FIG. 4B, the resin tube 20 is coated on the outer peripheral surface including the outer peripheral surface of the rubber roll 12 (roll main body 14) and the protruding portion 26 of the cylindrical body 22. That is, the resin tube 20 is covered from the outer peripheral surface of the rubber roll 12 (roll main body 14) to the outer peripheral surface including the protruding portion 26 of the cylindrical body 22.

  Here, as in the second embodiment, the heat capacity of the rubber roll 12 at both axial ends (cylindrical body 22 side) is larger than the heat capacity of the rubber roll 12 at the axial center. Therefore, the temperature of the roll body 14 on the axial center side is higher than that of the axial end parts, and the resin tube 20 is covered from the axial center part side of the roll body 14 to the axial end parts side. To go.

  Thereby, the air bubbles existing between the outer peripheral surface of the roll main body 14 and the inner peripheral surface of the resin tube 20 move from the axial central portion side of the roll main body 14 to both axial end portions, and the lower end of the cylindrical body 22. The portion 22A and the upper end portion 14A of the roll body 14 move toward the inner peripheral surface side of the cylindrical body 22 through a minute gap at the boundary portion 28. And it exhausts outside through the micro clearance gap between the internal peripheral surface of the cylindrical body 22, and the outer peripheral surface of the axial part 15. FIG.

  Further, when the resin tube 20 is coated on the outer peripheral surface of the cylindrical body 22, the resin tube 20 is restricted from contracting toward the axially central portion by the protruding portion 26. Therefore, the resin tube 20 is excessively contracted toward the axial center, and the upper end 20B before the cutting process described later is present on the axial central side with respect to the upper end 14A of the roll body 14, that is, Generation | occurrence | production of the malfunction that the outer peripheral surface in the upper end part 14A side of the roll main body 14 is not coat | covered with the resin tube 20 is suppressed or prevented compared with 1st Embodiment.

  In particular, in the third embodiment, since the protruding portion 26 has a cylindrical surface 26A, the sliding of the inner peripheral surface of the resin tube 20 with respect to the outer peripheral surface of the cylindrical body 22 compared to the protruding portion 24 of the second embodiment. The dynamic resistance area increases. Therefore, compared with the second embodiment, the occurrence of the above problems is further suppressed or prevented.

  Subsequently, as shown in FIG. 4C, the resin tube 20 is cut by a cutter 30 at a boundary portion 28 where the lower end portion 22A of the cylindrical body 22 and the upper end portion 14A of the roll body 14 are in contact ( Cutting step).

  For example, as in the first embodiment, the cutter 30 is inserted between the lower end portion 22A of the cylindrical body 22 and the upper end portion 14A of the roll body 14 (the cutter 30 is inserted into the boundary portion 28), and then fixed. By rotating the rubber roll 12 with respect to the cutter 30, the resin tube 20 is cut along the circumferential direction at the boundary portion. Although two cutters 30 are shown in FIG. 4C, one cutter 30 may be used.

  Then, as shown in FIG. 4D, the cylindrical body 22 whose upper surface (part) from the cut portion of the resin tube 20 is covered with the outer peripheral surface is removed from the rubber roll 12. As a result, the fixing roll 10 in which the upper end portion 14A of the roll body 14 and the upper end portion 20A of the resin tube 20 covered with the roll body 14 are aligned is manufactured.

  That is, the positional accuracy of the upper end portion 20A of the resin tube 20 in the upper end portion 14A of the roll body 14 is compared with the case where the roll tube 14 of the rubber roll 12 is covered with the resin tube 20 by heat contraction without using the cylindrical body 22. Is improved.

  In addition, since the resin tube 20 adhering to the outer peripheral surface of the cylindrical body 22 is unnecessary after the cutting process, it is removed from the cylindrical body 22 in the next process. The cylindrical body 22 from which the unnecessary resin tube 20 is removed is attached to the shaft portion 15 of the next rubber roll 12 and reused.

(Manufacturing method according to the fourth embodiment)
Finally, a manufacturing method according to the fourth embodiment of the fixing roll 10, that is, a method of manufacturing the fixing roll 10 by covering the rubber roll 12 with the resin tube 20 will be described. In addition, the same code | symbol is attached | subjected to the site | part equivalent to the said 1st-3rd embodiment, and detailed description is abbreviate | omitted suitably.

  As shown in FIG. 5, in the fourth embodiment, two protrusions 26 of the cylindrical body 22 in the third embodiment are formed at intervals in the axial direction of the cylindrical body 22. In addition, the two protrusion parts 24 of the cylindrical body 22 in 2nd Embodiment may be formed in the axial direction of the cylindrical body 22 at intervals.

  In addition, the outer diameter of the lower end portion 22 </ b> A of the cylindrical body 22 is the same as the outer diameter of the roll body 14. The inner diameter of the cylindrical body 22 is the same as the outer diameter of the shaft portion 15. Hereinafter, each step will be described.

  First, as shown in FIG. 5A, the cylindrical body 22 is fitted and attached to the shaft portion 15 (attachment process). At this time, the lower end portion 22 </ b> A of the cylindrical body 22 is brought into contact with the upper end portion 14 </ b> A of the roll body 14. Then, the rubber roll 12 including the cylindrical body 22 is relatively inserted into the resin tube 20. At this time, the inner diameter of the resin tube 20 is larger than the outer diameter of each protruding portion 26 of the cylindrical body 22.

  Next, the entire resin tube 20 in which the rubber roll 12 (including the cylindrical body 22) is inserted is heat-shrinked (heat-shrinking step). As a result, as shown in FIG. 5B, the resin tube 20 is coated on the outer peripheral surface of the rubber roll 12 (roll body 14) and the outer peripheral surface including the two protruding portions 26 of the cylindrical body 22. That is, the resin tube 20 is covered from the outer peripheral surface of the rubber roll 12 (roll main body 14) to the outer peripheral surface including the protruding portion 26 on the upper side of the cylindrical body 22.

  Here, as in the second embodiment, the heat capacity of the rubber roll 12 at both axial ends (cylindrical body 22 side) is larger than the heat capacity of the rubber roll 12 at the axial center. Therefore, the temperature of the roll body 14 on the axial center side is higher than that of the axial end parts, and the resin tube 20 is covered from the axial center part side of the roll body 14 to the axial end parts side. To go.

  Thereby, the air bubbles existing between the outer peripheral surface of the roll main body 14 and the inner peripheral surface of the resin tube 20 move from the axial central portion side of the roll main body 14 to both axial end portions, and the lower end of the cylindrical body 22. The portion 22A and the upper end portion 14A of the roll body 14 move toward the inner peripheral surface side of the cylindrical body 22 through a minute gap at the boundary portion 28. And it exhausts outside through the micro clearance gap between the internal peripheral surface of the cylindrical body 22, and the outer peripheral surface of the axial part 15. FIG.

  Further, when the resin tube 20 is coated on the outer peripheral surface of the cylindrical body 22, the contraction of the resin tube 20 toward the axially central portion is restricted by the two protruding portions 26. Therefore, the resin tube 20 is excessively contracted toward the axial center, and the upper end 20B before the cutting process described later is present on the axial central side with respect to the upper end 14A of the roll body 14, that is, Generation | occurrence | production of the malfunction that the outer peripheral surface in the upper end part 14A side of the roll main body 14 is not coat | covered with the resin tube 20 is suppressed or prevented compared with 1st Embodiment.

  In particular, in the fourth embodiment, since two projecting portions 26 having a cylindrical surface 26A are formed in the axial direction, only one projecting portion 24 of the second embodiment or one of the third embodiments is provided. The sliding resistance area of the inner peripheral surface of the resin tube 20 with respect to the outer peripheral surface of the cylindrical body 22 is further increased as compared with the protruding portion 26 alone. Therefore, compared with the second and third embodiments, the occurrence of the above problems is further suppressed or prevented.

  Subsequently, although not shown, the resin tube 20 is cut by the cutter 30 (see FIG. 5) at the boundary portion 28 where the lower end portion 22A of the cylindrical body 22 and the upper end portion 14A of the roll body 14 are in contact with each other, as in the third embodiment. 2 to 4)) (cutting step).

  Then, the cylindrical body 22 whose upper side (part) is covered with the outer peripheral surface from the cut portion of the resin tube 20 is removed from the rubber roll 12. As a result, the fixing roll 10 in which the upper end portion 14A of the roll main body 14 and the upper end portion 20A of the resin tube 20 covered with the roll main body 14 are aligned (see FIGS. 2 to 4) is manufactured.

  That is, the positional accuracy of the upper end portion 20A of the resin tube 20 in the upper end portion 14A of the roll body 14 is compared with the case where the roll tube 14 of the rubber roll 12 is covered with the resin tube 20 by heat contraction without using the cylindrical body 22. Is improved.

  In addition, since the resin tube 20 adhering to the outer peripheral surface of the cylindrical body 22 is unnecessary after the cutting process, it is removed from the cylindrical body 22 in the next process. The cylindrical body 22 from which the unnecessary resin tube 20 is removed is attached to the shaft portion 15 of the next rubber roll 12 and reused.

  The manufacturing method of the fixing roll 10 (tubular body covering member) according to the present embodiment has been described based on the drawings. However, the manufacturing method of the fixing roll 10 (tubular body covering member) according to the present embodiment is illustrated in the drawing. However, the present invention is not limited thereto, and the design can be changed as appropriate without departing from the scope of the present invention. For example, in the cutting step of each embodiment, the rubber roll 12 may be fixed, the cutter 30 may be moved in the circumferential direction of the rubber roll 12, and the resin tube 20 may be cut at the boundary portion 28.

  Further, in the second and third embodiments, the position at which the protrusion 24 and the protrusion 26 are formed is not limited to the axial central portion of the cylindrical body 22, for example, the lower end than the axial central portion. It may be on the 22A side. According to this, the amount of the resin tube 20 that becomes unnecessary after the cutting step and is removed from the outer peripheral surface of the cylindrical body 22 is reduced, which is advantageous in terms of cost. In addition, it cannot be overemphasized that the axial direction center part and the lower end part 22A side and the upper end part 22B side are also contained in an axial direction middle part rather than an axial direction center part.

  Further, in the fourth embodiment, the number of the protrusions 24 or the protrusions 26 formed on the cylindrical body 22 with an interval in the axial direction is not limited to two. Three or more may be formed. That is, at least one protrusion 24 or protrusion 26 is formed on the cylindrical body 22. Further, the tubular body covering member manufactured by the manufacturing method according to the present embodiment is not limited to the fixing roll 10 used in a fixing device (not shown).

  Furthermore, in each embodiment, although the rubber roll 12 in which the rubber layer 18 was formed in the outer side of the metal core 16 was shown as a member, it is not the meaning limited to this. The member may be a metal roll without a rubber layer. Specifically, the member in FIGS. 2 to 5 may be a metal roll in which the main body portion 14 and the shaft portions 15 formed at both ends thereof are integrally formed of the same metal or alloy. Even a tube-coated metal roll in which the resin tube 20 is coated on the surface of such a metal roll functions as a fixing roll.

10 Fixing roll (an example of a tubular body covering member)
12 Rubber roll (an example of a cylindrical or cylindrical member)
15 shaft portion 20 resin tube (an example of a tubular body)
22 cylindrical body 24 projecting portion 26 projecting portion 26A cylindrical surface 28 boundary portion

Claims (3)

Attaching a cylindrical body having an outer diameter equal to that of the member to a shaft provided at an end of a columnar or cylindrical member and having a smaller diameter than the end, in contact with the end; ,
Coating the member with a tubular body including the cylindrical body, and heat-shrinking the tubular body;
Cutting the tubular body at the boundary between the cylindrical body and the member;
The manufacturing method of the tubular body coating | coated member provided with. At least one projecting portion projecting radially outward is continuously formed in the middle portion of the cylindrical body in the circumferential direction,
The method for manufacturing a tubular body-covered member according to claim 1, wherein, in the step of heating and shrinking the tubular body, the member is covered with the tubular body including the protruding portion.   The manufacturing method of the tubular body covering member according to claim 2, wherein an outer peripheral surface of the protruding portion is a cylindrical surface.

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