JP5155098B2 - Manufacturing method of roller structure such as fixing roller and roller structure - Google Patents

Description

  The present invention relates to a roller structure in an image forming apparatus, a method for manufacturing the same, and a manufacturing jig. For example, a roller structure in which an annular ring is lined on an inner wall surface of a cylindrical sleeve body such as a fixing roller for fixing a transferred image. It relates to the improvement of manufacturing.

  Generally, a roller for heating and fixing a toner image transferred on a sheet or the like is fitted with a sleeve body of a thermoplastic film (TPI, PEI, PAI, etc.) as a skin layer on a cylindrical shaft core body such as steel or aluminum. They are manufactured together.

  In this case, the film-like skin sleeve is required to have a uniform effect with less unevenness on the heating effect and pressure bonding (pressure contact) effect on the transfer sheet, and at the same time miniaturization (minimization of roll diameter), durability and manufacturing. Improvements are also required in cost.

  In this case, when a cylindrical shaft core body such as metal and a sleeve body such as a plastic film are integrated by bonding, the amount of heat formed by heating (for example, IH heater heating) on the skin layer escapes from the shaft core body to the outside. Therefore, an attempt has been made to prevent the sleeve body from being displaced in the axial direction by fitting the sleeve body to the shaft core body and interposing a friction ring therebetween at a predetermined interval (for example, both left and right end portions). Yes. As a result, the thermal characteristics (uniformity of thermal conductivity, etc.) of the sleeve body are not impaired, and at the same time, the shape and mechanical strength of the film-like sleeve body are ensured.

Conventionally, the following method has been adopted as a manufacturing method in which a friction ring is lined on the inner wall surface of such a cylindrical sleeve body and fitted into a cylindrical shaft core body. First, the shaft core body, the sleeve body, and the ring member are formed of optimum materials. The inner and outer diameters of each member are manufactured within a predetermined allowable accuracy. A friction ring is fitted to a shaft core body such as metal, and an adhesive is applied to the outer periphery of the friction ring, and then a cylindrical sleeve body is fitted. At this time, the adhesive is composed of a two-component, heat-curing agent or the like so that the sleeve body after application may be attached to other than the adhesive surface.
JP 2001-290384 A

  As described above, the following problem arises when an annular ring is attached to the inner wall surface of a cylindrical sleeve body made of a resin having excellent thermal characteristics. First of all, there is a problem that the annular ring and the cylindrical sleeve body are attached while being displaced in the axial direction, or the annular ring is bonded while being deformed by being distorted in the axial direction. This does not employ a method of aligning the cylindrical sleeve body and the annular ring with a common reference plane and bonding them together, so that they are displaced from each other during bonding. In particular, when the annular ring is distorted and deformed in the axial direction and is bonded to the sleeve body, the cylindrical sleeve body may be displaced in the axial direction during rotation of the fixing roller or the like, leading to a device failure.

  Second, there arises a problem that the adhesive adheres to other than the adhesive surface. This is because when the annular ring (friction ring) is fitted to the inner wall surface of the sleeve body, it is necessary to fit the sleeve or ring in a state where an adhesive is applied to one of the rings. It frequently happens to adhere to other than the adhesive surface. For this reason, conventionally, the work of fitting the ring to the sleeve is carried out manually with great care, or removed as a defective product by product inspection after production.

  Thirdly, when the annular ring is made of an elastomer material having a high coefficient of friction and the cylindrical sleeve body is made of a rigid resin material (TPI, PEI, PAI, etc.), a ring member is formed on the inner wall surface of the sleeve body. The problem that the operation | work to fit becomes complicated arises.

  Therefore, the present inventor, when fitting a ring member rich in elasticity into the hollow of a cylindrical sleeve body rich in rigidity and difficult to be elastically deformed, is shaped in a state where the ring member is tightened on a manufacturing jig (manufacturing jig). The idea has been reached that the above-mentioned problems can be solved by holding and fitting the sleeve body to the outer periphery of the tightened ring member.

  The present invention relates to a manufacturing jig, a manufacturing method, and a roller for inexpensively manufacturing a roller structure in which the sleeve body is not displaced in the axial direction when the cylindrical sleeve body is fitted to the outer periphery of the columnar shaft core body. The issue is the provision of structures. Another object of the present invention is to provide a simple manufacturing method for bonding an annular ring to a predetermined portion of the inner wall surface of a cylindrical sleeve body, and a manufacturing jig used therefor.

To achieve the above object, the present invention employs the following configuration.
A cylindrical shaft core body having a predetermined shape, a cylindrical sleeve body, and an elastic ring are sequentially fitted in this order so as to be integrated. Then, an elastic ring is fitted to the inner wall surface of the cylindrical sleeve body and fixed with an adhesive, and then the cylindrical sleeve body with the ring is fitted to the outer periphery of the columnar shaft core body. When an elastic ring is fitted to and integrated with the inner wall surface of this cylindrical sleeve body, the elastic ring is tightened on a fitting drum formed on the molding die to be fitted and held in an outer diameter shape that matches the inner diameter of the sleeve body. To do.
The flange connected to the fitting drum is provided with a ring end abutting surface for regulating the axial end edge of the elastic ring and a sleeve end abutting surface for regulating the axial end edge of the cylindrical sleeve body. Thus, for example, the elastically deformable ring is contracted and held at an outer diameter that can be easily fitted to the sleeve body. At this time, a reference surface for positioning the end face of the ring and the end face of the sleeve body is formed on the flange of the fitting drum. Details of the configuration will be described below.

A fixing roller manufacturing method in which a cylindrical sleeve body (20) is disposed on the outer periphery of a cylindrical shaft core body (11), and elastic rings (30) (annular rings; the same applies hereinafter) are interposed at both axial ends. The cylindrical shaft core body is made of a metal material, the cylindrical sleeve body is made of a synthetic resin material, and the elastic ring (30) is made of an elastomer material.
A shaft core forming step for forming the cylindrical shaft core body (11) into a predetermined shape, and a sleeve forming step for forming a cylindrical sleeve body (20) having an inner diameter that matches the outer diameter of the columnar shaft core body. When fitting the ring forming step of forming an elastic ring (30) having a smaller inner diameter than the outer diameter of the cylindrical mandrel in inner diameter larger than the outer diameter of the cylindrical sleeve body, the resilient ring mold and joining the first step of positioning fixing, and joining a second step of wearing bonded with adhesive fitted a cylindrical sleeve body in a mold fitted to the elastic ring, the elastic ring from the mold A third joining step for separating the attached cylindrical sleeve body and a fourth step for press-fitting the cylindrical sleeve body to which the elastic ring is attached to the columnar shaft core body are configured.
The mold has the elastic ring (30) and the cylindrical fitting drum sleeve body (20) is fitted and held (51), the flange (52) continuous to the fitting drum, the said the fitting drum provided凹嵌portion for tensioning the resilient ring, said flange includes a surface (56) butting ring end located restricting the axial end edge of the elastic-ring, the cylindrical sleeve A sleeve end abutting surface (57) for restricting the position of the axial end edge of the body is provided.

  In the second joining step, after the adhesive is applied to the inner wall surface (23) of the cylindrical sleeve body (20), the cylindrical sleeve body (20) is placed on a molding die that holds the annular ring (30). Is attached to the inner wall surface (23) of the cylindrical sleeve body (20).

  A step of fitting and integrating the cylindrical sleeve body (20) to which the annular ring (30) separated from the mold (50) in the third joining step is attached to the columnar shaft core body (11). Including.

  A cylindrical shaft core body (11) having an appropriate length, a cylindrical sleeve body (20) wound around the outer periphery of the cylindrical shaft core body (11) to form a surface layer, and the columnar shaft core body ( 11) and an annular ring (30) mounted between the cylindrical sleeve body (20), and the cylindrical sleeve body (20) and the annular ring (30) are manufactured by the above-described manufacturing method. Manufactured.

  The cylindrical sleeve body (20) is made of a resin material having a small elastic modulus with respect to the annular ring (30) and hardly elastically deformed by an external force, and the annular ring (30) has an elastic modulus of the cylindrical shape. It is formed of an elastomer larger than the sleeve body (20).

  A roller structure manufacturing jig configured by adhering an annular ring (30) to an inner wall surface (23) of a cylindrical sleeve body (20) having a predetermined length, the annular ring (30) Is formed by a fitting drum (51) that holds the outer diameter of the cylindrical sleeve body (20) in conformity with the inner diameter of the cylindrical sleeve body (20), and a flange (52) connected to the fitting drum (51). (51) is formed with a recess for accommodating and tightening a part of the annular ring (30), and a fitting part for fitting and holding the tightened annular ring (30). The flange (52) includes a ring end abutment surface (56) for positioning the axial end edge of the annular ring (30) fitted to the fitting portion, and an outer periphery of the annular ring (30). The position of the axial end edge of the cylindrical sleeve body (20) that fits into the sleeve is regulated. Providing a surface (57) butting over blanking end.

  The concave portion is provided with a guide projection for holding the annular ring (30) in a distorted state, and a part of the annular ring (30) accommodated in the distortion is bulged to the outside so that the cylindrical sleeve is provided. Extruding means for copying the inner wall surface (23) of the body (20) is provided.

  According to the present invention, an annular ring that can be elastically deformed is formed into a predetermined shape, and this is held in an outer diameter shape that is tightened on a fitting drum of a molding die, and a cylindrical sleeve body in which an adhesive is applied to the outer periphery of the ring The roller structure and the manufacturing method thereof, which are integrated with each other by fitting and then fitted to the outer periphery of the cylindrical shaft core, have the following effects.

  When fitting and bonding the annular ring within the inner diameter of the sleeve body, the annular ring is tightened on the fitting drum provided in the manufacturing jig and held in an outer diameter shape that can be easily fitted to the sleeve body, Since the cylindrical sleeve body is fitted in this state to join them, the annular ring can be easily fitted into the inner diameter of the cylindrical sleeve body. For this reason, the bonding operation is easy, and the manufacturing cost can be significantly reduced.

  Therefore, the cylindrical sleeve body is made of a film material that is rigid and hardly elastically deforms in the outer diameter direction, and the annular ring is made of an elastic material that is elastic and easily elastically deformed in the outer diameter direction. In this case, the two members can be easily fitted and overlapped.

  Further, according to the present invention, a manufacturing jig for bonding the annular ring and the cylindrical sleeve body includes a surface that abuts the edge of the annular ring against the flange adjacent to the fitting drum, and a cylindrical sleeve body. Since there is a surface that regulates against the end edge, the axial position of the ring and the sleeve body is set constant by inserting the annular ring and the cylindrical sleeve body into the fitting drum of the manufacturing jig. I can do it. Accordingly, there is no fear that the annular ring is distorted and joined in the inner wall surface of the cylindrical sleeve body, or the axial ring is not displaced and joined.

  The roller structure according to the present invention, a method for manufacturing the same, and a manufacturing jig used therefor will be described in detail below based on the preferred embodiments of the present invention shown in the drawings. 1A and 1B are explanatory views of a roller structure according to the present invention, wherein FIG. 1A is a cross-sectional view showing the overall structure, FIG. 1B is an explanatory view of a cylindrical sleeve constituting the roller structure, and FIG. It is an expansion explanatory view of the A section shown in (b). 2A and 2B are explanatory views of a method for manufacturing a roller structure, in which FIG. 2A is an exploded view illustrating a state in which an annular ring is fitted to the cylindrical sleeve body, and FIG. 2B is a perspective view of the cylindrical sleeve body. Yes, showing a state in which an annular ring is fitted. FIG. 3 shows the structure of the manufacturing jig, (a) is a perspective view of the manufacturing jig, shows a state where an annular ring is mounted, (b) is a plan view of the manufacturing jig, and (c) is the center. A longitudinal sectional view is shown. FIG. 4 is a process explanatory view showing the manufacturing process of the roller structure.

[Roller structure]
As shown in FIG. 1, the roller structure 1 according to the present invention includes a cylindrical shaft core body 11, a cylindrical sleeve body 20, and an annular ring (elastic ring; hereinafter the same) 30. The cylindrical shaft core 11 is constituted by a solid cylindrical body or a hollow cylindrical body having an appropriate length 11L as shown in FIG. The cylindrical shaft core body 11 is made of a material selected from mechanical strength and durability such as aluminum alloy, iron-based metal, and synthetic resin. A cylindrical shaft core 11 shown in FIG. 1 has an axial length of 11L and an outer diameter of 11d. 11x in the drawing shows a right end portion of a columnar shape, and 11y shows a left end portion. An annular ring 30 to be described later is arranged on the left and right end portions 11x and 11y, and the cylindrical sleeve body 20 is disposed through the annular ring 30. It is fitted on the outer periphery.

  The cylindrical sleeve body 20 is formed of a material according to the application of the roller structure 1 and forms a cylindrical roller outer surface. The illustrated roller structure 1 is used for the purpose of heat-fixing toner transferred onto a sheet as a fixing roller in an image forming apparatus such as a copying machine or a printer. For this reason, the cylindrical sleeve 20 constituting the outer surface of the roller structure (fixing roller) 1 is made of a material selected from thermal conductivity, heating characteristics, heat resistance, etc., for example, thermoplastic polyimide (TPI), polyether. It is formed of ether ketone (PEEK), polyetherimide (PEI), polyamideimide (PAI) or the like.

  The cylindrical sleeve body 20 is wound around the outer circumference of the columnar shaft core body 11. 21L in the drawing shows the length in the axial direction, 21x shows the right end, 21y shows the left end, 21d shows the outer diameter, and 22d shows the inner diameter. That is, the cylindrical sleeve body 20 is configured in a cylindrical shape (tube shape) having an inner peripheral diameter 22d and an outer peripheral diameter 21d.

  The sleeve body made of TPI, PEEK, PEI or the like is rich in rigidity and has a small amount of elastic deformation when subjected to a predetermined external force. The amount of deformation that elastically deforms both in the axial direction (longitudinal direction) and in the circumferential direction is small. Therefore, even if the cylindrical sleeve body 20 is fitted to the columnar shaft core body 11, the sleeve body 20 exhibits a characteristic that it is easily displaced in the axial direction. The annular ring 30 is fitted to the inner wall surface 23 of the cylindrical sleeve body 20 and joined with an adhesive. Reference numeral 33D shown in FIG. 1C denotes an adhesive surface formed on the annular ring 30, and reference numeral 40 denotes an adhesive layer.

Therefore, an annular ring 30 is interposed between the cylindrical shaft body 11 and the cylindrical sleeve body 20. The annular ring 30 is made of a material having elasticity and high friction characteristics. The illustrated annular ring 30 is made of a silicone rubber material, and a right ring 30x is disposed at the right end portion 11x of the cylindrical shaft core 11, and a left ring 30y is disposed at the left end portion 11y. The annular rings 30x and 30y (hereinafter collectively referred to as “30”) are integrally joined to either the cylindrical shaft core body 11 or the cylindrical sleeve body 20 with an adhesive or the like, and the joined opposite ends. A high frictional force acts between the side member surfaces. In other words, the annular ring 30 is arranged between the cylindrical shaft core body 11 and the cylindrical sleeve body 20 at both ends in the axial direction (illustrated form), or a plurality of annular rings 30 are arranged at a predetermined interval (not shown). These annular rings 30 are bonded to one of the columnar shaft body 11 and the cylindrical sleeve body 20, and an elastic force and a high frictional force are applied to the other. 31d in the figure is the outer diameter (outer diameter) of the annular ring 30, and 32d is the inner diameter (inner diameter). 33D shown in the figure is a D-cut adhesive surface formed on the annular ring side in order to join the annular ring 30 and the cylindrical sleeve body 20 together.

  Therefore, the cylindrical shaft core body 11, the cylindrical sleeve body 20, and the annular ring 30 described above have an outer diameter (outer diameter; the same applies hereinafter) 11d of the cylindrical shaft core body 11 and an inner diameter (inner diameter) of the cylindrical sleeve body 20. 22d is formed so that 11d <22d, and the cylindrical sleeve body 20 can be inserted into the cylindrical shaft core 11. Further, the ring inner diameter 32d is set to 11d≈32d so as to be fitted to the shaft core outer diameter by elastic deformation of the ring with respect to the shaft core outer diameter 11d. In this case, it is preferable to form the ring inner diameter 32d slightly smaller than the shaft core outer diameter 11d and press-fit it by elastic deformation of the ring. Similarly, the relationship between the cylindrical sleeve body 20 and the annular ring 30 is such that the outer diameter of the ring 31d ≧ the inner diameter of the sleeve 22d so that the cylindrical sleeve body 20 is press-fitted by elastic deformation of the annular ring 30. The outer diameter 31d is preferably slightly larger than the sleeve inner diameter 22d.

  In the roller structure 1 configured as described above, the annular ring 30 is fitted to the outer periphery of the cylindrical shaft core 11, and the cylindrical sleeve body 20 is further fitted to the outer periphery. It is necessary to fit the ring in a press-fit relationship and the ring and the sleeve body in a press-fit relationship in order to ensure the durability, airtightness, and thermal uniformity of the roller structure 1. Therefore, the present invention is characterized in that these three are easily manufactured at low cost. As described above, the roller structure 1 is characterized in that the annular ring 30 is bonded to the inner wall surface 23 of the cylindrical sleeve body 20 with the adhesive layer 40, and then the annular ring 30 is lined. A structure in which 20 is fitted to the cylindrical shaft core 11 is employed.

  The roller structure 1 configured as described above is disposed opposite to a pressure contact roller having the same structure or a different structure, and allows a sheet on which toner ink is transferred to pass between the roller pair. At this time, the roller structure 1 is heated by a heating means (not shown). This heating means is composed of a high frequency generating coil (excitation coil) adjacent to the outer periphery of the roller or a heater built in the roller. The roller structure 1 is supported by both ends of the cylindrical shaft core 11 on the apparatus frame and is rotated by a drive motor. At this time, the cylindrical sleeve body 20 may be skewed due to load fluctuations of an opposing roller or a nip sheet. At this time, an annular ring 30 is interposed between the cylindrical sleeve body 20 and the columnar shaft core body 11. Therefore, the annular ring 30 is bonded and integrated with the sleeve body or the shaft core with the adhesive layer 40, and the ring is formed so that a frictional force acts between the other member (the shaft core body or the sleeve body). The ring 30 is made of a material having high elasticity and at the same time having a high coefficient of friction. As a result, the rotation of the cylindrical shaft body 11 is unbalanced in the axial direction, and the cylindrical sleeve body 20 acts between the cylindrical sleeve body 20 and the columnar shaft core body 11 even when a force that is displaced in the axial direction acts on the cylindrical sleeve body 20. The cylindrical sleeve body 20 is not skewed in the axial direction by the frictional force.

[Method of manufacturing roller structure]
Next, a method for manufacturing the roller structure 1 according to the present invention will be described. The manufacturing method of the roller structure 1 for adhering the annular ring 30 to the inner wall surface 23 of the cylindrical sleeve body 20 described above is the following “sleeve body forming step” “ring forming step” “joining first step” “joining first” 2 steps ”and“ joining third step ”.

  The “sleeve body forming step” is formed of the material forming the outer surface of the roller structure 1 into the shape described above. For this reason, when the roller structure 1 is a conveyance roller such as a sheet, it is formed of a high friction material such as a rubber material, and when it is a fixing roller or the like, it is formed of a constant temperature material having heat resistance and low thermal conductivity. And it forms with the manufacturing process according to a material use. In the case of the illustrated fixing roller, it is processed and formed into a sheet shape with a thermoplastic film (for example, thermoplastic polyimide, PEEK, polyamideimide, etc.). Then, the material on the sheet is cut into a predetermined axial length 21L and a circumferential length (21d × π). Then, the cylindrical sleeve body 20 is formed by joining both ends of the orthogonal direction by heat welding. In addition, what is necessary is just to manufacture the manufacturing process of this cylindrical sleeve body 20 by the already known process method.

  In the “ring forming step”, the above-described annular ring 30 is formed of an elastic material. The annular ring 30 has an appropriate axial length 31L and is formed with a ring outer diameter 31d and a ring inner diameter 32d. The illustrated one is formed into a ring shape by injecting an uncrosslinked silicone rubber into a ring-shaped mold (not shown) and crosslinking by heating. At this time, the forming die (not shown) is formed in a semicircular cross section, a rectangular cross section, and an elliptical cross section so as to have an adhesive surface 33D (preferably a flat surface). The ring outer diameter 31d of the annular ring 30 is set to be slightly larger than the sleeve body inner diameter 22d. Then, the annular ring 30 is contracted so as to be in close contact with the inner wall surface 23 of the sleeve body. Similarly, the ring inner diameter 32 d of the annular ring 30 is set slightly smaller than the outer diameter 11 d of the cylindrical shaft core 11. Then, the annular ring 30 expands so as to closely contact the outer wall surface of the cylindrical shaft core body 11.

  In the present invention, various known manufacturing methods can be employed for the above-described ring molding and sleeve molding, and the present invention is not limited to the cylindrical sleeve body 20 and the annular ring formed in a cylindrical shape. 30 is formed into a suitable size and shape with a material according to its application. The present invention is characterized by a method in which an annular ring 30 rich in elasticity is tightly fitted and bonded to the inner wall surface 23 of the cylindrical sleeve body 20.

  Conventionally, in the fixing roller structure, the sleeve body on the surface is hardly elastically deformed and is formed of a resin material having a high rigidity, and the annular ring 30 (30x, 30y) fitted thereto is made of an elastic elastomer such as silicone. Since it is configured, a complicated operation is required to fit the deformable ring into the cylindrical sleeve body 20 in the correct position and orientation, and defective products are frequently generated in the manufacturing process, resulting in high manufacturing costs due to scrapping costs. It has become a cause. Therefore, the present invention solves this problem by the following first through third steps.

[Molding die structure]
Hereinafter, a manufacturing jig (hereinafter referred to as “molding die 50”) used in the first to third bonding steps will be described with reference to FIGS. The mold 50 includes a fitting drum 51 that follows the inner diameter of the annular ring 30 and a flange 52 that abuts and regulates the end surface of the annular ring 30 and the end surface of the cylindrical sleeve body 20. As shown in FIG. 3A, the molding die 50 has a fitting part drum 51 that fits the annular ring 30 with synthetic resin or metal and holds the shape thereof, and is continuous in shape with the drum 51. And a flange 52. A fitting portion 55 that fits and retains the shape of the annular ring 30 by fitting the annular ring 30 to the fitting portion drum 51 and a part of the annular ring 30 provided in a part of the fitting portion are tightened. A recessed portion 53 for receiving is formed. The outer diameter 55d of the fitting portion 55 is set to be smaller than the inner diameter 32d of the annular ring 30, and the outer diameter 31d of the annular ring 30 wound around this is tightly contracted to the outer diameter (hereinafter referred to as “constricted outer diameter”). The diameter is reduced to 31x. The contraction outer diameter 31x is set to be smaller than the inner diameter 22d of the cylindrical sleeve body 20 [constriction outer diameter 31x <sleeve body inner diameter 22d].

  Therefore, a recessed portion 53 is formed at a position continuous with the fitting portion 55, and is formed so as to accommodate the surplus portion 30v of the annular ring 30 that is tightened. As described above, the annular ring 30 is tightened so that the outer diameter 31d can be easily fitted (inserted) into the inner wall surface 23 of the cylindrical sleeve body 20, and the shape is held at the contracted outer diameter 31x. In this state, [constriction outer diameter 31x <sleeve body inner diameter 22d], and the cylindrical sleeve body 20 is fitted to the outer periphery of the annular ring 30.

  In order to maintain the shape of the annular ring 30 in the recessed portion 53, a guide protrusion 58 is provided in the recessed portion 53. The annular ring 30 is wound around the fitting portion 55 by the guide protrusion 58 as shown in FIG. Although the illustrated guide protrusion 58 is configured by a pin implanted in the recessed portion 53 and the guide protrusion 58 is configured to be detachable from the recessed portion 53, it may be formed integrally with the recessed portion 53.

[Method of manufacturing roller structure]
A process subsequent to the above-described ring forming process will be described in the case where the roller structure 1 is manufactured with the above-described mold 50.
“First step of bonding”
The annular ring 30 manufactured in the above-described ring forming step is wound around the fitting portion 55 as shown in FIGS. 3 (a) and 3 (b). At this time, the annular ring 30 is elastically deformed and contracted. As a result, the annular ring 30 is deformed to the contracted outer diameter 31x, the surplus portion 30v is accommodated in the recessed portion 53 and fitted and supported by the guide protrusion 58, and the ring outer diameter 31d is held in the contracted outer diameter 31x. At this time, the end surface 30e of the annular ring 30 (see FIG. 4E) is positioned on the ring end abutting surface 56 of the flange 52 on the ring end abutting surface 56 formed on the flange 52.

“2nd bonding process” “3rd bonding process”
Next, an adhesive is applied to the right end portion 21x of the cylindrical sleeve body 20 manufactured in the above-described sleeve body process to form the adhesive layer 40. The right end portion 21 x of the cylindrical sleeve body 20 to which the adhesive layer 40 is applied is fitted into the fitting portion 55 of the mold 50. At this time, the end surface of the right end portion 21x of the cylindrical sleeve body 20 is positioned on the sleeve end abutting surface 57 formed on the flange 52 as shown in FIG. The ring end abutting surface 56 and the sleeve end abutting surface 57 shown in the figure are formed on the same plane, but a step may be formed between the abutting surface 56 and the abutting surface 57.

  Since the ring end abutting surface 56 and the sleeve end abutting surface 57 are formed on the flange 52 connected to the fitting portion 55 in this way, the axial positions of the cylindrical sleeve body 20 and the annular ring 30 are positioned and set. I can do it. At the same time, when the cylindrical sleeve body 20 is fitted to the outer periphery of the annular ring 30 by the abutting surfaces 56 and 57, the position of the annular ring 30 is not displaced in the axial direction.

"Join 4th process"
Next, the right end portion 21x of the cylindrical sleeve body 20 and the right end ring 30x are fitted, and the cylindrical sleeve body 20 is detached and separated from the molding die 50 when the adhesive layer 40 is solidified in a semi-fixed state. Then, the right end ring 30x is joined to the right end portion 21x of the cylindrical sleeve body 20 in a semi-fixed state and is integrally separated from the mold 50. Thereafter, the surplus portion 30v of the right end ring 30x is formed along the inner wall surface 23 of the cylindrical sleeve body 20 with the fingers of the operator.

  Next, the left end ring 30 y is fitted into the fitting portion 55 of the mold 50 in the same manner as the right end ring 30 x described above. Next, the adhesive layer 40 is applied to the left end portion 21y of the cylindrical sleeve body 20, and the cylindrical sleeve body 20 on which the adhesive layer is formed is fitted to the outer periphery of the left end ring 30y as described above. Then, after a predetermined time has elapsed, the cylindrical sleeve body 20 and the left end ring 30y are separated from the mold, and the surplus portion 30v of the left end ring 30y is formed. The annular ring 30 can be easily fixed to the inner wall surface 23 of the cylindrical sleeve 20 by such a process.

[Second Embodiment of Mold]
FIG. 6 shows an embodiment (second embodiment) different from the mold 50 described according to FIG. 3, and the above-described mold forms a fitting portion 55 integrally with the fitting drum 51, and this fitting portion. Fig. 5 shows a case where the annular ring 30 (30x, 30y) is fitted in a contracted state. FIG. 6 shows a case where the fitting portion moves in the radial direction from a large diameter to a small diameter. The fitting drum 61 includes a fitting member 61 and a flange member 65 for fitting the annular ring 30. The fitting drum 61 is composed of first to fourth fitting members obtained by dividing a disk-like member into a plurality of parts such as two or three, and each of the fitting members 61a to 61d is a mold body (the one shown is a flange). The member 65) is fitted and supported so as to be movable in the radial direction. That is, the flange member 65 is formed in the radial direction, and the fitting pins 61p implanted in the fitting members 61a to 61d are slidably supported in the guide groove 61g.

  Accordingly, the fitting members 61a to 61d divided into a plurality are respectively fitted with a tight fitting outer diameter (tightening outer diameter) 62d in FIG. 6A along the guide groove 61g formed in the main body, and FIG. It will change to the expanded fitting outer diameter (expanded outer diameter) 63d. The inner diameter 22d of the cylindrical sleeve body 20 is set such that [(constriction outer diameter 62d) <(sleeve body inner diameter 22d)] and [(expanded outer diameter 63d) ≈ (sleeve body inner diameter 22d)]. Yes.

  The fitting members 61a to 61d thus divided into a plurality of discs are formed with fitting portions 64a to 64d for winding the annular ring 30 to maintain the shape, and a recess is formed in a part thereof. 64 is provided. The flange end 65 formed on the mold main body 60 is formed with a ring end abutting surface and a sleeve end abutting surface as in the above-described embodiment.

  In order to displace the fitting members 61a to 61d to the contracted position and the expanded position, the mold body 60 is provided with an eccentric cam and a drive motor for rotating the cam forward and backward, although not shown. Then, when the drive motor rotates in the forward direction, the fitting members 61a to 61d are moved from the contracted position in FIG. 6A to the expanded position in FIG. 6B, and from the expanded position to the contracted position in the reverse rotation of the motor. It is supposed to move.

  Therefore, the fitting members 61a to 61d are positioned at the contracted position (FIG. 6A; initial position), and the annular ring 30 (30x, 30y) is fitted to the fitting portions 64a to 64d of the fitting drum 61 in this state. Mate and set. Then, the elastic annular ring 30 is wound around the fitting portions 64a to 64d in a contracted state, and a part thereof is accommodated in the recessed portion 64, and the shape is maintained in this state.

  Next, the adhesive layer 40 is applied to the edge of the cylindrical sleeve body 20, and then the sleeve body 20 is fitted to the outer periphery of the annular ring 30 held by the mold 60. At this time, the annular ring 30 is held in the shape of the contracted outer diameter 62d, and the contracted outer diameter 62d is set smaller than the inner diameter 22d of the cylindrical sleeve body 20, so that the work of fitting the ring and the sleeve body is completed. It becomes easy. Further, at this time, the position of the annular ring 30 is regulated by the ring end abutment surface, and the cylindrical sleeve body 20 is regulated by the sleeve abutment surface. The position in the axial direction is not misaligned. In this case, the position in the axial direction is restricted by a single surface (same plane), but a step may be provided on each abutting surface of the ring end and the sleeve body end.

  After the cylindrical sleeve body 20 is fitted to the outer periphery of the annular ring 30 as described above, the fitting members 61a to 61d are moved from the contracted position in FIG. 6 (a) to the expanded position in FIG. 6 (b). . As described above, when the plurality of fitting members 61a to 61d expand from the contraction outer diameter 62d to the expansion outer diameter 63d, a part of the annular ring 30 accommodated in the recess 64 is pushed out from the recess 64. Then, it comes into close contact with the inner wall surface 23 of the cylindrical sleeve body 20. Therefore, the fitting members 61a to 61d and driving means (for example, a motor and an eccentric cam) that move the position of the fitting members constitute pushing means.

  In the present invention, the recessed portion 53 (64) for accommodating the surplus portion 30v when the annular ring 30 is contracted may be any of a U shape, a V shape, and an ohm (Ω) shape. Of course.

It is explanatory drawing of the roller structure concerning this invention. (A) is sectional drawing which shows the whole structure, (b) is explanatory drawing of the cylindrical sleeve body which comprises a roller structure, It is explanatory drawing of the manufacturing method of a roller structure, (a) is assembly exploded explanatory drawing of the state which fits an annular ring to a cylindrical sleeve body, (b) is a perspective view of a cylindrical sleeve body, The state which fitted the annular ring is shown. FIG. 3 shows the structure of a manufacturing jig related to the method of manufacturing the roller structure, (a) is a perspective explanatory view of the entire structure of the manufacturing jig, (b) is a plan view of the manufacturing jig, and (c). Shows a central longitudinal section. (A) thru | or (d) is a conceptual diagram which shows the manufacturing process of a roller structure. (E) thru | or (f) is a conceptual diagram which shows the manufacturing process of a roller structure. FIG. 3 shows an embodiment different from the mold shown in FIG. 3, (a) shows a configuration when a ring is attached to a fitting drum formed on the mold, and (b) is attached to the fitting drum. The structure at the time of sleeve fitting which fits a cylindrical sleeve body to the outer periphery of a ring is shown.

Explanation of symbols

1 Roller structure (fixing roller)
11 Cylindrical shaft core body 11d Shaft core outer diameter 20 Cylindrical sleeve body 21x Right end portion 21y Left end portion 21d Outer diameter 22d Sleeve body inner diameter 23 Inner wall surface 30 Toroidal ring 30x Right ring 30y Left ring 30v Surplus portion 30e End surface 31d Outside the ring Diameter 32d Ring inner diameter 31x Contraction outer diameter 40 Adhesive layer 50 Mold (manufacturing jig)
51 Fitting drum 52 Flange 53 Recessed part 55 Fitting part 55d Outer diameter 56 (fitting part) Ring end abutting surface 57 Sleeve end abutting surface 58 Guide protrusion 60 Mold (manufacturing jig; second embodiment)
61 Fitting drum 61a First fitting member (extrusion means)
61b Second fitting member (extrusion means)
61c 3rd fitting member (extrusion means)
61d Fourth fitting member (extrusion means)
61g Guide groove 61p Fitting pin 62d Fitting part outer diameter (when ring is installed)
63d Outer diameter of fitting part (when sleeve is inserted)
65 Flange member

Claims (3)

A method of manufacturing a fixing roller , in which a cylindrical sleeve body is integrally formed on an outer periphery of a cylindrical shaft core body, and elastic rings are interposed at both ends in the axial direction .
The cylindrical shaft core is a metal material, the cylindrical sleeve is a synthetic resin material, and the elastic ring is an elastomer material,
Configured,
A shaft core forming step of forming the cylindrical shaft core into a predetermined shape;
A sleeve forming step of forming a cylindrical sleeve body having an inner diameter matching the outer diameter of the cylindrical shaft core;
A ring forming step of forming an elastic ring having an inner diameter smaller than the outer diameter of the cylindrical mandrel in inner diameter larger than the outer diameter of the cylindrical sleeve body,
A first joining step for fitting and positioning and fixing the elastic ring to a mold;
A joining second step of fitting a cylindrical sleeve body to a molding die fitted with the elastic ring and adhering with an adhesive;
A third joining step for separating the cylindrical sleeve body to which the elastic ring is attached from the mold ;
A fourth step of press-fitting the cylindrical sleeve body with the elastic ring attached thereto into the columnar shaft core;
Consisting of
The mold is
A fitting drum for fitting and holding the elastic ring and the cylindrical sleeve body;
A flange connected to the mating drum ;
Have
The fitting drum is provided with a recessed fitting portion for tightening the elastic ring,
The flange includes
A ring end abutment surface for regulating the position of the axial end edge of the elastic ring;
A plane abutment sleeve end located restricting the axial end edge of said cylindrical sleeve body,
And a fixing roller structure manufacturing method. It is a manufacturing method of the roller structure according to claim 1,
In the second joining step, after applying an adhesive to the inner wall surface of the cylindrical sleeve body, the inner wall surface of the cylindrical sleeve body is fitted by fitting the cylindrical sleeve body into a mold that holds the elastic ring. A method of manufacturing a fixing roller structure, comprising attaching an elastic ring to the fixing roller structure. The cylindrical sleeve body is made of a resin material that has a small elastic modulus with respect to the elastic ring and is not easily elastically deformed by an external force,
The roller structure according to claim 1, wherein the elastic ring is made of an elastomer having an elastic modulus larger than that of the cylindrical sleeve body.

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