JP5757396B2 - Rubber roller - Google Patents

Description

  The present invention relates to a rubber roller used for office automation equipment and the like, and more particularly to a rubber roller used for a card conveying driven roller and the like.

  As shown in FIG. 5, the conventional rubber roller 20 is configured by providing a rubber ring 22 on the outer periphery of a cylindrical outer ring member 21, and a bearing 23 or the like is incorporated on the inner periphery of the outer ring member 21. The rubber roller 20 is formed by applying an adhesive to the outer peripheral surface of the outer ring member 21 and vulcanizing and bonding the outer ring member 21 and the rubber ring 22 so that the rubber ring 22 does not come off from the outer ring member 21.

JP 11-291701 A

  However, in the structure of the prior art of FIG. 5, the rubber ring 22 is elastically deformed by the pressure with which the rubber roller 20 comes into contact with an object to be contacted such as paper or a card, whereby the outer ring member 21 and the rubber ring 22 are bonded. There was a problem that the shearing force was applied to the portion, and the peeling between the outer ring member 21 and the rubber ring 22 occurred. This peeling of the adhesive causes the rubber ring 22 to be removed from the outer ring member 21, that is, the roller is broken.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-described problems, and in a rubber roller in which an outer ring member and a rubber ring are bonded, a rubber roller capable of reducing adhesion peeling between the outer ring member and the rubber ring that causes a roller breakage. Is to provide.

  In order to achieve the above object, the present invention comprises an outer ring member that rotates about an axis, and a rubber ring that is bonded to the outer peripheral surface of the outer ring member and has a sliding contact surface that contacts an object to be contacted on the outer periphery. The rubber roller is characterized in that a rubber ring abutting portion that projects from the outer circumference of the outer ring member in the radial direction of the outer ring member and abuts on both side surfaces of the rubber ring is provided.

  The rubber ring abutting portion is preferably bonded to both side surfaces of the rubber ring.

  The rubber ring contact portion and the outer ring member may be formed separately.

  The rubber ring contact portion may have a width of 0.5 mm and a height from the outer periphery of the outer ring member of 0.5 mm to 1.5 mm.

  The adhesion is preferably vulcanization adhesion.

  According to the present invention, in the rubber roller in which the outer ring member and the rubber ring are bonded, it is possible to reduce adhesion peeling between the outer ring member and the rubber ring, which causes a roller breakage.

It is sectional drawing which shows 1st embodiment of this invention. It is sectional drawing which shows 2nd embodiment of this invention. It is a figure which shows the stress distribution figure of each part of a rubber ring when analyzing the shear stress concerning a rubber ring at the time of use of this invention and the rubber roller of a prior art example. It is explanatory drawing ((a) front view, (b) side view) explaining the test machine which imitated the card reader real machine simply. It is sectional drawing which shows the rubber roller of a prior art example.

  Hereinafter, a preferred first embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  First, the configuration of the present invention will be described.

  FIG. 1 shows a first embodiment of a rubber roller 10 of the present invention.

  A rubber roller 10 according to the first embodiment of the present invention is used for, for example, a driven roller, and as shown in FIGS. 1 and 2, an outer ring member 11 that rotates about an axis O, and an outer ring And a rubber ring 12 having a slidable contact surface 12a that is bonded to the outer peripheral surface of the member 11 and is in contact with an object to be contacted on the outer periphery. The rubber roller 10 is provided with rubber ring abutting portions 18 that project from the outer circumference of the outer ring member 11 in the radial direction of the outer ring member 11 and abut on both side surfaces of the rubber ring 12.

  Hereinafter, each configuration will be described in detail.

  The outer ring member 11 is made of a metal such as cylindrical aluminum, and a bearing 13 is incorporated in the inner periphery thereof.

  A ring-shaped protection member 15 is provided on each side surface of the outer ring member 11, and a rubber ring 12 is provided on the outer peripheral surface of the outer ring member 11. As shown in FIG. 1, the width of the bearing 13 is narrower than the width of the outer ring member 11 in the present embodiment. The width of the rubber ring 12 is the same as the width of the outer ring member 11.

  The protection member 15 is made of a metal such as ring-shaped aluminum. One protection member 15 is provided on each side surface of the outer ring member 11 from the side surface of the outer ring member 11 to the side surface of the rubber ring 12.

  That is, the protection member 15 has an outer diameter larger than the outer diameter of the outer ring member 11 with the axis O of the outer ring member 11 as the center. Further, the protection member 15 is fixed to the side surface of the outer ring member 11 so as to rotate integrally with the rotation of the outer ring member 11.

  The rubber ring contact portion 18 is in contact with the side surface of the rubber ring 12. In the present embodiment, the rubber ring abutting portion 18 is a part of the protective member 15 that protrudes from the outer periphery of the outer ring member 11 in the radial direction of the outer ring member 11. The width w of the rubber ring contact portion 18 (protective member 15) is preferably 0.5 mm to 1.0 mm, and the height h of the rubber ring contact portion 18 from the outer peripheral surface of the outer ring member 11 is the rubber ring. Considering the amount of elastic deformation at the time of 12 maximum elastic deformation, a height that does not touch the contact surface such as paper is necessary, and 0.5 mm to 1.5 mm is preferable.

  In this embodiment, the outer ring member 11 and the rubber ring 12 are bonded to each other by applying an adhesive to the outer peripheral surface of the outer ring member 11 and adding a vulcanizing agent such as sulfur or peroxide thereto. The outer ring member 11 and the rubber ring 12 are vulcanized and bonded by press-molding with a mold. At this time, the rubber ring 12 is formed in a cylindrical shape. In the present embodiment, an adhesive is also applied to the inner surface of the rubber ring contact portion 18 so that the rubber ring contact portion 18 and the rubber ring 12 are vulcanized and bonded during the press molding. The method for adhering the outer ring member 11 and the rubber ring 12 is not limited to the above. By providing a wedge on the outer periphery of the outer ring member 11, press molding without applying an adhesive can be performed. The rubber ring 12 can be separately press-molded, and the outer ring member 11 to which the adhesive has been applied is fitted into the outer periphery of the outer ring member 11 and bonded without vulcanization (such as this) It is also possible to refer to bonding as post-bonding.

  FIG. 2 shows a rubber roller 10 according to the second embodiment of the present invention.

  In the rubber roller 10 according to the second embodiment shown in FIG. 2, the outer ring member 11 is wider than the bearing 13. A concave groove 16 is formed in the outer peripheral portion of the outer ring member 11 along the circumferential direction. In the present embodiment, the rubber ring contact portion 18 is a portion that protrudes from the outer periphery of the outer ring member 11 in the radial direction so as to form the concave groove 16. That is, in the present embodiment, the rubber ring contact portion 18 and the outer ring member 11 are integrally formed. Examples of the method for forming the concave groove 16 include a method in which the groove 16 is integrally formed using die casting or cutting. However, in consideration of dimensional accuracy and processing cost, an integrated body by cutting is preferable.

  Also in the present embodiment, as in the first embodiment, the outer ring member 11 and the rubber ring 12 are bonded to each other by applying an adhesive to the outer peripheral surface of the outer ring member 11, such as sulfur or peroxide. This is performed by press-molding an unvulcanized rubber to which a vulcanizing agent has been added with a mold, thereby vulcanizing and bonding the outer ring member 11 and the rubber ring 12. At this time, the rubber ring 12 is formed in a cylindrical shape. Also in the present embodiment, as in the first embodiment, an adhesive is also applied to the inner surface of the rubber ring contact portion 18, and the rubber ring contact portion 18 and the rubber ring are applied during the press molding. 12 is also vulcanized. The method for adhering the outer ring member 11 and the rubber ring 12 is not limited to the above. By providing a wedge on the outer periphery of the outer ring member 11, press molding without applying an adhesive can be performed. The rubber ring 12 can be separately press-molded, and the outer ring member 11 to which the adhesive is applied is fitted to the outer periphery of the outer ring member 11 and bonded, that is, bonded without vulcanization (such as It is also possible to refer to bonding as post-bonding.

  In the first embodiment and the second embodiment, in order to suppress interference with other parts in use, it is preferable that the bearing does not protrude from the cored bar, but this is not limited depending on the application.

  Further, in the first embodiment and the second embodiment, the width w and the height h of the rubber ring abutting portion 18 are 0.5 to 1. mm as in the embodiment of FIG. The height h was 0 to 1.5 mm. The distance from the rubber ring contact portion 18 to the sliding contact surface 12a is preferably about 0.5 to 1.5 mm.

  Furthermore, as a material used as the rubber ring 12 in the first embodiment and the second embodiment, a rubber material having low hardness, chemical resistance, and migration resistance is desirable, and the rubber roller 10 is a finger oil. In view of the fact that there is a possibility that foods and drinks may come into contact, silicone rubber is particularly desirable as a material. However, this is not limited by the mechanism of the card reader, and depending on the prescription of the rubber compound, fluorine rubber, nitrile rubber, butyl rubber, etc. may be mentioned.

  As the material of the outer ring member 11, a metal material was used in consideration of the rubber ring 12 being vulcanized and bonded. As the metal material, aluminum that satisfies workability, dimensional stability, environmental friendliness, strength, and cost is desirable, but not limited thereto. In the above, considering that the rubber ring 12 is vulcanized and bonded, a metal material is used as the material of the outer ring member 11. Resin can also be used when (vulcanization temperature etc.) can be set appropriately.

  Next, the operation of the present invention will be described.

  The present invention includes an outer ring member 11 that rotates about an axis O, and a rubber ring 12 that is bonded to the outer peripheral surface of the outer ring member 11 and has a sliding contact surface 12a that contacts an object to be contacted on the outer periphery. Further, the rubber roller 10 is provided with rubber ring abutting portions 18 that project from the outer periphery of the outer ring member 11 in the radial direction of the outer ring member 11 and abut on both side surfaces of the rubber ring 12. As a result, the shear stress applied to the adhesive surface between the outer ring member 11 and the rubber ring 12 that is generated when the rubber ring 12 is elastically deformed by coming into contact with the object to be in contact with the rubber ring contact with both side surfaces of the rubber ring 12. It can be received at the contact portion 18 and the shear stress can be relaxed. Therefore, according to the present invention, in the rubber roller 10 in which the outer ring member 11 and the rubber ring 12 are bonded, it is possible to reduce the adhesion peeling between the outer ring member 11 and the rubber ring 12 that causes the roller destruction. The life of the rubber roller can be extended.

  Further, the rubber ring contact portion 18 and the rubber ring 12 are bonded. Thereby, the adhesion range of the rubber ring 12 is expanded, and the rubber ring 12 is more firmly bonded, so that it is possible to further reduce roller breakage. That is, in this case, the rubber ring abutting portion 18 has a function of reducing adhesion peeling between the outer ring member 11 and the rubber ring 12 and a function of expanding the adhesion range of the rubber ring 12.

  Furthermore, the rubber ring 12 is bonded to the outer peripheral surface of the outer ring member 11 by vulcanization bonding. Thereby, the adhesion between the rubber ring 12 and the outer ring member 11 is strengthened, and the adhesion peeling between the outer ring member 11 and the rubber ring 12 can be further reduced.

  Examples of the present invention and conventional examples will be described below.

  As an example of the present invention, the rubber roller 10 according to the second embodiment shown in FIG. 2 was used.

  The material composition was rubber ring material: silicone rubber, and aluminum was selected for the outer ring member.

  The axial width of the rubber ring contact portion is 0.5 mm, and the height of the rubber ring contact portion is 0.5 mm (Example 1), 1.0 mm (Example 2), 1.5 mm (Example 3). ) Outer ring member was prepared.

  In the rubber roller of this embodiment, an adhesive is applied to the outer peripheral surface of the outer ring member and the inner surface of the rubber ring contact portion, the rubber ring is press-molded, the rubber ring and the outer ring member, and the rubber ring and the rubber ring. The contact portion is vulcanized and bonded.

  Further, the rubber roller of the conventional example is not provided with a rubber ring abutting portion, but an adhesive is applied to the outer peripheral surface of the outer ring member, the rubber ring is press-molded, and the rubber ring and the outer ring member are vulcanized and bonded. Produced.

  In order to consider the durability of the present invention (Example 3) and the conventional example, the shear stress was analyzed when the rubber roller was used, that is, when the rubber was elastic.

  FIG. 3 shows the analysis results. (A) shows the shear stress distribution applied to the rubber ring of the present invention, and (b) shows the shear stress distribution applied to the rubber ring of the conventional example.

  This analysis condition shows the distribution of the shear stress when the lower part of the rubber ring is pressed against a flat surface with a force of 0.4 MPa. In the analysis result of the figure, the shear stress is applied as the gray becomes darker. Is shown.

  As a result of the analysis, in the case of the rubber ring of the conventional example not provided with the rubber ring contact portion, as shown in FIG. 3B, the lower part of the rubber ring surrounded by the dotted ellipse is crushed and swollen in the width direction, and the shear stress is It can be seen that the stress is concentrated in the inner peripheral portion that is distributed in the range of −0.2 MPa to −0.4 MPa, and is particularly in contact with the outer ring member. Therefore, when the rubber ring is rotated, stress is always concentrated on the inner peripheral portion, and adhesion peeling tends to occur. Therefore, it can be seen that the conventional rubber ring that does not include the rubber ring abutting portion is liable to be removed (roller breakage).

  On the other hand, in the case of the rubber ring having the rubber ring contact portion of the present invention, as shown in the dotted ellipse in FIG. 3A, the side surface of the rubber ring is in contact with the rubber ring contact portion. It was confirmed that the shear stress was relaxed to the rubber ring contact portion, and the shear stress concentrated on the inner peripheral portion of the rubber ring in contact with the outer ring member was reduced. Moreover, although the lower part of the rubber ring enclosed by the dotted ellipse was crushed similarly to the conventional example, no swelling in the width direction was observed, and it was confirmed that the shear stress was low as a whole.

  Here, when it is considered that the shear stress is caused by adhesion peeling, which is a major factor of roller breakage, it was confirmed from the analysis results that the present invention can be an effect of suppressing adhesion peeling.

  Next, a durability test was performed on Examples 1 to 3 and the conventional example using a testing machine that simply imitated a real card reader.

  Hereinafter, a test machine 30 that simply simulates an actual card reader and a test method will be described in detail.

  FIG. 4 is an explanatory diagram ((a) front view, (b) side view) illustrating a test machine 30 that simply simulates a real card reader.

  As shown in FIG. 4, a test machine 30 that simply simulates a card reader actual machine used for the durability test is in contact with a drive aluminum roller 41 that rotates about a drive side shaft 42 and a drive aluminum roller 41. A driven rubber roller 31 that rotates around the driven side shaft 32 following the rotation of the drive aluminum roller 41 and a load member 50 that applies a load to the driven side shaft 32 are provided. In this durability test, the rubber rollers of Examples 1 to 3 and the conventional example were used as the driven rubber roller 31. In addition, as a condition for the durability test, the load applied by the load member 50 to the driven shaft 32 was 4 kg weight.

  The durability test was performed by rotating the drive aluminum roller 41 in a state where 4 kg weight was applied to the driven side shaft 32 by the load member 50, rotating the driven rubber roller 31 according to the rotation, and how many times the driven rubber roller 31 was rotated. Test to see if roller breakage has occurred.

  The results are shown in Table 1.

  As shown in the results of Table 1, in the conventional example, the roller breakage occurred at about 375K (375,000) rotation, but the rotation speed until the roller breakage in Examples 1 to 3 occurred was about 540K rotation in Example 1. In Example 2, the rotation speed was about 980K, and in Example 3, the rotation speed was about 1875K. It was confirmed that the number of rotations until the roller breakage increased significantly. In particular, Example 3 has a protective member height h of 1.5 mm, which is 5 times more durable than the conventional example, and also about 3.5 times more durable than Example 1. Recognize.

  Although this height should just be high, it considers the amount of elastic deformation at the time of maximum elastic deformation of rubber ring 12 as mentioned above, and is 0.5-1 in the height which does not touch the to-be-contacted surface, such as paper. Determine within the range of 5 mm.

  In addition, the card | curd used by normal ATM etc. is sent one by the driven roller 31 used for this durability test rotating 3 times. Considering this, when the number of rotations until the roller breakage occurs is converted into the number of cards that can be sent before the roller breakage (number of deliverables), the conventional example: about 125K (125000) sheets Example 1: about 180K sheets, Example 2: about 326K sheets, Example 3: about 625K sheets.

  As described above, the present invention has confirmed that the usage environment of the rubber roller can be a beneficial effect when the usage environment is always in contact with other rubber components and requires a usage method with elastic deformation for a long time. That is, it has been confirmed that, according to the present invention, in the rubber roller in which the outer ring member and the rubber ring are bonded, it is possible to reduce adhesion peeling between the outer ring member and the rubber ring, which causes the roller breakage.

DESCRIPTION OF SYMBOLS 10 Rubber roller 11 Outer ring member 12 Rubber ring 15 Protection member 18 Rubber ring contact part

Claims (4)

An outer ring member that rotates about an axis;
One rubber ring having a rectangular cross-sectional shape, adhered to the outer peripheral surface of the outer ring member, and having a sliding contact surface in contact with the object to be contacted on the outer periphery;
A rubber ring abutting portion that projects from the outer circumference of the outer ring member in the radial direction of the outer ring member and abuts on both side surfaces of the rubber ring;
The rubber ring contact portion has a height from the outer periphery of the outer ring member of 0.5 mm to 1.5 mm,
The distance from the rubber ring contact portion to the sliding contact surface is 0.5 to 1.5 mm,
The rubber roller, wherein the rubber ring contact portion is bonded to both side surfaces of the rubber ring.   The rubber roller according to claim 1, wherein the rubber ring contact portion and the outer ring member are integrally formed. The adhesive and the rubber roller according to claim 1 or 2 which is vulcanization. The rubber roller according to claim 3 , wherein the outer ring member and the rubber ring contact portion are made of metal.