JP6491462B2 - roller - Google Patents

Description

  The present invention relates to a roller suitable for an image forming apparatus such as a copying machine or a printer.

  Conventionally, as a roller used in an image forming apparatus such as a copying machine, a printer, and a facsimile, a barrel member formed of a metal and a shaft member formed of metal are separately formed, and both end portions of the barrel member are formed. A shaft member is press-fitted into each of them, and then both a body member and a shaft member are connected by pins (for example, see Patent Document 1).

JP 2007-122202 A

  However, in the conventional roller, since the shaft member is press-fitted into each of both end portions of the body member, at least the inner diameter dimension of the body member and the outer diameter dimension of the shaft member at the press-fit portion are made highly accurate. There is a problem that manufacturing is not easy because it is necessary and a high pressure is required for press-fitting.

  The present invention has been made in view of these points, and an object thereof is to provide a roller that can be easily manufactured.

In order to solve the above-mentioned problems, the roller of the present invention has one end of a shaft member made of metal disposed at both ends of an inner hole of a body member formed in a pipe shape with metal, and the cylinder. A roller in which a member and the shaft member are joined by a pin formed of metal, and the body member and the shaft member are fitted with one end of the shaft member at both ends of an inner hole of the body member A through hole used for coupling by the pin is formed at the end of the body member, and the outer peripheral surface of the shaft member fitted into the inner hole of the body member is formed by the pin. A shaft-side pin insertion portion used for coupling is formed, the shaft-side pin insertion portion is formed to have a larger diameter than the through-hole, and the pin includes both the through-hole and the shaft-side pin insertion portion. The pin is formed with a smaller diameter than the shaft. The pin is made of a material softer than the body member or the same material as the body member, and the body member and the shaft member include the through hole and the shaft side pin insertion portion. By inserting and setting the pins in both of them and plastically deforming the whole of the pins so as to expand the diameter of the entire interior space of the through hole and the shaft side pin insertion portion, a plastic deformation body is obtained. One end of the member is coupled to the body member so as not to move in the axial direction and the rotational direction, and the pin is coupled so as to be immovable in the axial direction of the pin .

By adopting such a configuration, the shaft member is fitted to each of the both end portions of the barrel member, so that the accuracy of the inner diameter dimension of the barrel member and the outer diameter dimension of the shaft member at the fitting portion is improved. Compared to the configuration in which the shaft member is press-fitted into each of both end portions of the member, it is not necessary to have high accuracy and high pressure is not required for fitting. Furthermore, since the pin is formed with a smaller diameter than both the through hole and the shaft side pin insertion portion, the pin can be easily inserted into both the through hole and the shaft side pin insertion portion. Therefore, manufacture can be performed easily. In addition, since the shaft-side pin insertion portion is formed to have a diameter larger than that of the through hole, a part of the plastic deformation body can bite into the shaft-side pin insertion portion, so that the shaft member can be removed from the body member. The stopper can be more reliably performed , and the pin can be more reliably prevented from coming off in the axial direction .

  In the present invention, the body member may be made of a material softer than the shaft member. And by employ | adopting such a structure, the end of a shaft member can be easily fitted to the inner hole of a trunk | drum member.

  According to the roller of the present invention, since the shaft member is fitted to each of both end portions of the body member, it is not necessary to increase the accuracy of the inner diameter dimension of the body member and the outer diameter dimension of the shaft member in the fitting portion. There is no need for high pressure. Furthermore, since the pin is formed to have a smaller diameter than both the through hole and the shaft side pin insertion portion, the pin can be easily inserted into both the through hole and the shaft side pin insertion portion. Therefore, there are excellent effects such as easy manufacture.

Sectional drawing which shows the principal part of 1st Embodiment of the roller which concerns on this invention Partial expanded sectional view which shows the principal part of 2nd Embodiment of the roller which concerns on this invention.

  The present invention will be described below with reference to embodiments shown in the drawings.

  FIG. 1 shows a first embodiment of a roller according to the present invention. The roller 10 of this embodiment is formed of metal at both ends of an inner hole of a body member 20 formed into a pipe shape of metal. The shaft member 30 is integrated with a plastic deformation body 41 obtained by plastic deformation of a short rod-like pin 40 formed of metal.

  Both end portions in the axial direction of the inner hole of the body member 20 are fitting holes 21 into which fitting portions 32 which are one end portions of a shaft member 30 described later are fitted. Further, a through-hole 22 penetrating in the radial direction for use in coupling the barrel member 20 and the shaft member 30 is formed in a portion of the end portion in the axial direction of the barrel member 20 where the fitting hole 21 is formed. Has been. In the present embodiment, the two through holes 22 are arranged symmetrically about the axis of the body member 20.

  As the material of the body member 20, a material softer than the material of the shaft member 30, for example, an aluminum alloy is used.

  The shaft member 30 is formed in a stepped manner in which a small-diameter bearing portion 31 disposed on the outer side in the axial direction and a large-diameter fitting portion 32 disposed on the inner side of the bearing portion 31 are connected by a step portion 33. Has been. The fitting portion 32 is an end portion that is fitted into the fitting hole 21 of the body member 20. In addition, a coupling hole 34 is formed on the outer peripheral surface of the fitting portion 32 as a shaft-side pin insertion portion for use in coupling the body member 20 and the shaft member 30. The coupling hole 34 is recessed toward the center of the shaft member 30. In the present embodiment, the two coupling holes 34 are arranged symmetrically about the axis of the shaft member 30 with the opening facing radially outward. The inner diameter of the coupling hole 34 is the same size as the inner diameter of the through hole 22 formed in the body member 20. In the present embodiment, the bottomed coupling hole 34 is used as the shaft-side pin insertion portion, but may be penetrated.

  As the material of the shaft member 30, a material harder than the material of the body member 20, for example, steel is used.

  What is necessary is just to set as the number of the said coupling holes 34 and the through-holes 22 as needed, such as a design concept. For example, the number may be singular or may be three or more. Here, in the case where the number of the coupling holes 34 and the through holes 22 is three or more, the arrangement of the coupling holes 34 and the through holes 22 may be arranged so that a circle is equally divided from the axis line. You may arrange | position by shifting in a direction and may arrange | position combining these. However, in the sense that the rotation balance of the roller 10 is good, it is preferable to arrange the circle so as to be equally divided from the axis and to arrange it symmetrically with the axial center as the symmetry plane. Of course, the number of the coupling holes 34 and the through holes 22 is the same.

  It should be noted that at least one of the inner surface of the fitting hole 21 and the outer peripheral surface of the fitting portion 32 is a knurling mechanism that prevents mechanical detachment, and an air flow path for communicating the inner space of the roller 10 with the outside. Etc. may be formed.

  The body member 20 and the shaft member 30 are configured so that the fitting member 32 is fitted into the fitting hole 21 and the shaft member is formed by the plastic deformation body 41 filled in the internal space of both the through hole 22 and the coupling hole 34. 30 is coupled to the body member 20 so as not to move in both the axial direction and the rotational direction. As shown by a two-dot chain line in FIG. 1, the plastic deformable body 41 includes a pin 40 formed in a rod shape having a smaller diameter than both the through hole 22 and the coupling hole 34, for example, a cylindrical shape, along the axial direction thereof. By being crushed, the pin 40 is formed by performing plastic working that causes plastic deformation so that at least both ends of the pin 40 are expanded in diameter.

  The material of the pin 40 may be a material softer than the body member 20 or the same material as the body member 20. Further, a material softer than the shaft member 30 is used as the material of the pin 40. In the present embodiment, the same aluminum alloy as that of the body member 20 is used. It is preferable that the volume of the pin 40 is substantially the same as or smaller than the volume of the internal space of both the through hole 22 and the coupling hole 34 in the sense that there is no need for post-processing.

  Here, an embodiment of a method for manufacturing the roller 10 of the present embodiment will be described.

  The method for manufacturing the roller 10 according to the present embodiment (hereinafter simply referred to as a manufacturing method) is that the shaft member 30 in which the coupling hole 34 is formed in the fitting hole 21 of the body member 20 in which the through hole 22 is formed. After fitting the fitting portion 32 (fitting process), the pin 40 is inserted and set in both the through hole 22 and the coupling hole 34, and the pin 40 is plastically deformed to form a plastic deformable body 41 (plastic deformation). Process).

  More specifically, according to the manufacturing method of the present embodiment, first, the fitting portion 32 of the shaft member 30 is inserted and fitted into the fitting hole 21 of the trunk member 20. At this time, the through hole 22 and the coupling hole 34 are aligned.

  Next, the pin 40 is set in both the through hole 22 and the coupling hole 34, and the tip of the pin 40 is crushed along the axial direction by a processing head attached to a machine head of a rivet machine (not shown). As a result, at least the through hole 22 of the pin 40 and the open end of the coupling hole 34 adjacent to the pin 40 are plastically deformed so that the diameter increases toward the radially outer side. Thus, by forming the plastic deformation body 41 in the internal space of both the through hole 22 and the coupling hole 34, the finished product in which the shaft member 30 is coupled to the body member 20 so as to be immovable in both the axial direction and the rotational direction ( The roller 10) shown in FIG. 1 can be obtained. Here, the shape of the plastic deformable body 41 may be any shape as long as the shaft member 30 is coupled to the body member 20 so as to be immovable in both the axial direction and the rotational direction. There may be a gap in the space between the plastic deformation body 41 and the coupling hole 34.

  In order to crush the pin 40, a machining head attached to a machine head of a rivet machine (not shown) may be brought into contact and crushed along the axial direction.

  In addition, when the through hole 22 and the coupling hole 34 are formed after the fitting portion 32 of the shaft member 30 is fitted into the fitting hole 21 of the trunk member 20, between the fitting process and the plastic deformation process, A processing step for forming the through hole 22 and the coupling hole 34 in one step is provided.

  Next, the operation of the present embodiment having the above-described configuration will be described.

  According to the roller 10 of the present embodiment, the shaft member 30 is fitted to each of the both end portions of the barrel member 20, so that the accuracy of the inner diameter dimension of the barrel member 20 and the outer diameter dimension of the shaft member 30 in the fitting portion 32 is increased. It is not necessary to have high accuracy compared with a configuration in which a shaft member is press-fitted into each of both end portions of a conventional body member, high pressure is not required for fitting, and the pin 40 is inserted into the through hole 22 and the shaft side pin. Since the diameter is smaller than both of the coupling holes 34 as the portions, the pin 40 can be easily inserted into both the through holes 22 and the coupling holes 34 as the shaft side pin insertion portions. Therefore, the roller 10 can be easily manufactured.

  Further, according to the roller 10 of the present embodiment, the body member 20 and the shaft member 30 are joined by plastically deforming at least both ends of the pin 40 so as to expand the diameter, thereby forming a plastic deformable body. In addition, it is possible to reliably and easily prevent the shaft member 30 from coming off from the body member 20 as compared with the related art.

  Moreover, according to the roller 10 of this embodiment, since the trunk | drum member 20 is a softer material than the shaft member 30, the fitting part 32 of the shaft member 30 is easily fitted in the fitting hole 21 of the trunk | drum member 20. FIG. be able to.

  FIG. 2 shows an essential part of the second embodiment of the roller according to the present invention. The roller 10A of this embodiment is formed by forming the inner diameter of the coupling hole 34A larger than the inner diameter of the through hole 22A. It is configured.

  Since other configurations are the same as those of the roller 10 of the first embodiment described above, the same reference numerals are given to the same components, and detailed descriptions thereof are omitted.

  According to the roller 10A of the present embodiment having such a configuration, the same effect as the roller 10 of the first embodiment described above can be obtained, and the inner diameter of the coupling hole 34A is larger than the inner diameter of the through hole 22A. Since it is formed in a large diameter, a part of the plastic deformation body 41A obtained by plastic deformation of the pin 40A can be caused to bite into the coupling hole 34A, so that the shaft member 30 can be more reliably prevented from coming off from the body member 20. It can be carried out.

  The roller of the present invention includes various rollers in an image forming apparatus, such as a printing roller and a conveying roller in a printing apparatus, a pressure roller and a heating roller in a fixing device, a conveying roller, a tension roller, and a driving roller in a conveying apparatus using an endless belt. It can be used for a wide variety of things. Here, when the roller of the present invention is used as a pressure roller in a fixing device of an image forming apparatus, the roller of the present invention is used as a core metal and covers the surface of the externally exposed portion of the plastic deformation body of the pin of the core metal. Thus, the surface of the body member may be covered with an elastic layer made of silicone rubber or the like, and the surface of the elastic body layer may be covered with a release layer made of fluorine resin or the like. As a result, sufficient strength can be obtained over a long period of time as a pressure roller used in a heat fixing device in which a large load is repeatedly applied in a high temperature environment in the image forming apparatus.

  In addition, this invention is not limited to embodiment mentioned above, A various change is possible as needed.

10, 10A Roller 20 Body member 21 Fitting hole 22, 22A Through hole 30 Shaft member 31 Bearing part 32 Fitting part 33 Step part 34, 34A Coupling hole 40, 40A Pin 41, 41A Plastic deformation body

Claims (2)

One end of a shaft member made of metal is disposed at both ends of the inner hole of the body member formed in a pipe shape with metal, and the body member and the shaft member are coupled by a pin formed of metal. The roller that is
One end of the shaft member is fitted to both ends of the inner hole of the body member, the body member and the shaft member,
A through hole used for coupling with the pin is formed at the end of the body member,
A shaft side pin insertion portion used for coupling by the pin is formed on the outer peripheral surface of the shaft member fitted in the inner hole of the body member,
The shaft side pin insertion portion is formed to have a larger diameter than the through hole,
The pin is formed with a smaller diameter than both the through hole and the shaft side pin insertion portion,
The pin is a material softer than the shaft member,
The pin is a softer material than the body member or the same material as the body member,
The body member and the shaft member are set by inserting the pin into both the through hole and the shaft side pin insertion portion, and the entire pin is placed in an internal space of the through hole and the shaft side pin insertion portion. By plastically deforming so as to expand the diameter as a whole and forming a plastic deformed body, one end of the shaft member is coupled to the barrel member so as to be immovable in both the axial direction and the rotational direction ,
A roller characterized in that the pin is coupled so as not to move in the axial direction of the pin . The roller according to claim 1, wherein the body member is made of a material softer than the shaft member.

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