JP2016161760A - Rotary member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary member that can be manufactured at a low cost, can reduce the weight, and can also secure the strength.SOLUTION: A rotary member 10 includes: a cylindrical body 11 made of a metal such as stainless steel that has a surface layer (not shown in the figure) for suppressing the reaction with an alkaline material; and a mixed member 12 that includes sand(aggregate) 12A, water (not shown in the figure), and a soil hardening agent 12B, is filled into the cylindrical body 11, and has a specific gravity lower than that of the cylindrical body 11. The soil hardening agent 12B includes more than 90 wt% of components of Portland cement such as calcium oxide and silica.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rotating member.

  A metal rod made of stainless steel or the like is cut as a rotating member such as a roller, so that, for example, an electrophotographic apparatus such as an electrophotographic copying machine or a printer is provided with an image forming apparatus for transferring a toner image onto paper. The toner is used in various scenes such as a developing roll, a transfer roll, a fixing roll, and a pressure roll, which are arranged in a fixing device that thermally fixes toner on a paper surface.

  Under such circumstances, in order to improve the heat resistance and heat insulation of the surface of the rotating member, a ceramic roller composed of a metal shaft core and a ceramic cylindrical layer in order from the center of the rotating member to the outside has been proposed. (For example, refer to Patent Document 1). According to such a ceramic roller, the ceramic portion becomes lighter than the metal portion, and thus the weight of the entire roller can be reduced.

JP 2009-300504 A

  However, if the ceramic roller as described above is used for the purpose of reducing the weight, there is a problem that the material and the cost for processing become higher than those made of metal.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a rotating member that can be manufactured at low cost, can be reduced in weight, and can ensure strength.

The present invention employs the following means in order to solve the above problems.
The rotating member according to the present invention includes a cylinder, and a mixing member that includes an aggregate, water, and a soil hardening agent each having a specific gravity smaller than that of the cylinder, and is filled in the cylinder. The curing agent includes a component of Portland cement.

  In the present invention, since the specific gravity of the mixing member is smaller than that of the metal, the mixing member becomes light even with the same volume. On the other hand, the mixing member reinforces the strength of the cylindrical body and the strength of the entire rotating member becomes higher than in the case of only the cylindrical body.

  In the rotating member according to the present invention, a fiber member is mixed in the mixing member.

  In the present invention, the fiber member further suitably improves the adhesion between the aggregate and the soil hardening agent.

  In the rotating member according to the present invention, flanges for restricting the outflow of the mixing member from the end portion of the cylindrical body are arranged at both ends.

  In the present invention, both end portions of the mixing member are blocked by the flange so as not to be exposed to the outside.

  Moreover, the rotating member according to the present invention includes an outer cylinder that is extrapolated to the cylinder.

  The present invention prevents direct contact with the mixing member when the surface of the rotating member is in contact with another member.

  According to the present invention, the rotating member can be manufactured at low cost, and the strength can be ensured as well as weight reduction.

It is a perspective view which shows the roller which concerns on the 1st Embodiment of this invention. It is sectional drawing which shows the other example of the roller which concerns on the 1st Embodiment of this invention. It is sectional drawing which shows the roller which concerns on the 2nd Embodiment of this invention.

(First embodiment)
A first embodiment according to the present invention will be described with reference to FIG.
The roller (rotating member) 10 according to the present embodiment includes a cylindrical body 11 and a mixing member 12 filled in the cylindrical body 11.

  The cylinder 11 is made of a metal material such as austenitic stainless steel. A passive film (surface layer) (not shown) that suppresses the reaction with the alkaline substance is formed on the surface of the cylindrical body 11.

  The mixing member 12 includes sand (aggregate) 12A having a specific gravity smaller than that of the cylinder 11, water (not shown), and a soil hardening agent 12B. The soil hardening agent 12B uses a soil hardening agent (trade name “Stein”) developed by Matsumura Sogo Research Institute. Table 1 shows the chemical components of the soil hardening agent 12B.

  As shown in Table 1, in the soil hardening agent 12B, 90% or more of the weight is occupied by calcium oxide, silica, etc., which are components of Portland cement. Therefore, the specific gravity is smaller than that of the cylinder 11. In addition, the remaining components of the soil hardener 12B weaken the alkalinity generated by the shrinkage after curing and the hydration reaction.

  The mixing member 12 is further mixed with a fiber member 12C. The fiber member 12C may be inorganic or organic as long as it is formed in a fiber shape. For example, in order to impart charging properties, a conductive material is mixed.

  Disc-shaped flanges 13 for restricting the outflow of the mixing member 12 from the cylindrical body 11 are inserted at both ends of the cylindrical body 11. The flange 13 is made of a metal material such as austenitic stainless steel like the cylinder 11 and has an outer diameter substantially the same as the inner diameter of the cylinder 11.

  Here, as shown in FIG. 2, a shaft portion 16 </ b> A extending in the direction of the central axis C <b> 1 may be disposed on the flange 16 of the roller 15.

Next, the manufacturing method and operation of the roller 10 according to this embodiment will be described.
First, the sand 12A and the soil hardening agent 12B are mixed with water at a weight ratio of 3: 1, for example, and an appropriate amount of the fiber member 12C is mixed to create the mixing member 12. Note that the mixing weight ratio of the sand 12A and the soil hardener 12B may be in the range of 93% to 70% for the sand 12A and 7% to 30% for the soil hardener 12B.

  Then, the mixing member 12 is inserted into the cylinder 11. Thereafter, after the mixing member 12 is cured, flanges 13 are disposed at both ends of the cylinder 11.

  In the case of the roller 15 in which the shaft portion 16A is disposed on the flange 16, the shaft portion 16A is further centered.

  According to this roller 10, the mixing member 12 reinforces the strength of the cylindrical body 11, so that it can be manufactured at a lower cost than the case where the entire body is made of metal, and the entire weight of the roller 10 is reduced. However, the strength can be increased as compared with the case of the cylinder 11 alone. Further, by changing the mixing ratio of the aggregate component and the soil hardening agent 12B, various uses can be manufactured at low cost in accordance with the use environment as well as weight reduction.

  In particular, since the soil hardening agent 12B (trade name “Stein”) manufactured by Matsumura Sogo Research Institute, Inc. is used instead of just Portland cement, the viscosity should be higher than when Portland cement is simply mixed with sand 12A or water. Can do. Moreover, the alkalinity and shrinkage | contraction property produced when only Portland cement is mixed can be weakened by use of the soil hardening | curing agent 12B, and the lifetime improvement of the roller 10 and the maintenance of precision can be aimed at.

  Moreover, by mixing the fiber member 12 </ b> C into the mixing member 12, the shrinkage of the mixing member 12 can be further reduced and the strength can be improved.

  Further, since the flanges 13 are disposed at both ends of the cylinder 11, swelling and peeling of the mixing member 12 from both ends of the cylinder 11 can be suitably suppressed.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIG.
In addition, the same code | symbol is attached | subjected to the component similar to 1st Embodiment mentioned above, and description is abbreviate | omitted.
The difference between the second embodiment and the first embodiment is that an outer cylindrical body 21 such as resin is extrapolated to the outer peripheral surface of the mixing member 12 in the roller 20 according to this embodiment. It is.

  The outer cylinder 21 may be, for example, rubber or other organic material or inorganic material. The roller 20 includes a shaft portion 22A that protrudes from the flange 22 in the direction of the central axis C1.

Next, the manufacturing method and operation of the roller 20 according to this embodiment will be described.
First, as in the first embodiment, the sand 12A and the soil hardening agent 12B are mixed together with water at a weight ratio of 3: 1, for example. If necessary, an appropriate amount of the fiber member 12C is further mixed to form the mixing member 12.

  And after inserting the shaft body not shown which consists of metal materials, such as austenitic stainless steel longer than the cylinder 11, into the inside of the cylinder frame not shown, between the cylinder frame and the shaft body The mixing member 12 is inserted into. Thereafter, the end portions of the shaft body are respectively passed through the holes 22a of the flange 22 in which the holes 22a are previously formed in the center portion, and the flanges 22 are arranged at both end portions of the cylindrical body 11. Thereafter, the outer cylindrical body 21 is fitted to the outer surface of the cylindrical body 11, and the shaft body end portion is processed to form the shaft portion 22A.

  Here, instead of the shaft body, a flange 22 in which the shaft portion 22A is arranged in advance as in the first embodiment may be used.

  According to this roller 20, not only the direct contact of the mixing member 12 is suppressed, but the whole is manufactured only by the metal constituting the shaft body while reducing the weight of the entire roller 20 as in the first embodiment. The cost can be lower than the case.

The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, the cylindrical body 11 is made of metal. Moreover, although sand 12A is used as the aggregate, the present invention is not limited to this, and a porous member that can contribute to weight reduction may be miniaturized like sand 12A.

10, 15, 17, 20 Roller (Rotating member)
11 cylinder 12 mixing member 12A sand (aggregate)
12B Soil hardener 12C Fiber member 13, 16, 22 Flange 21 Outer cylinder

Claims (4)

A cylinder,
A mixing member filled with the aggregate containing aggregate, water, and soil hardening agent each having a specific gravity smaller than that of the cylinder;
With
The rotating member in which the soil hardening agent contains a component of Portland cement.   The rotating member according to claim 1, wherein a fiber member is mixed into the mixing member.   The rotating member according to claim 1 or 2, wherein flanges that restrict outflow of the mixing member from the end of the cylindrical body are arranged at both ends. The rotating member according to any one of claims 1 to 3, further comprising an outer cylindrical body that is extrapolated to the cylindrical body.

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