JPH066123Y2 - Fixing structure of end member in transport roller - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) This invention is a film provided in a developing device, a copying machine, or the like.
The present invention relates to a transport roller for transporting paper and the like, and more specifically, to a fixing structure of an end member arranged at an end of a pipe as a main body.

(Prior Art) A type of conveying roller provided in a film developing device for photographs, for example, an end member formed of a resin material different from that of the pipe on the inner peripheral surface of both ends of the resin pipe in the axial direction. There is a form in which it is pressed in from the outside and fixed by an adhesive. Third
The figure shows an example thereof, in which 100 is a pipe as a roller main body, and 102 is an end member which is press-fitted and fixed to the pipe 100. A rotary shaft 104 made of metal is fixed to the end member 102, and a driving force from a driving device is transmitted to the pipe 100 through the rotary shaft 104. Thus, in this type of conveyance roller used in a developing device or the like, since the pipe 100 is required to have chemical resistance, it is formed of, for example, thermosetting phenol resin, and the end member 102 is also chemically resistant. It is made of a thermoplastic resin such as ABS. The end member 102 in which the metal rotary shaft 104 is partially embedded is generally molded by injection molding. In this case, if the same phenol resin as the pipe 100 is used as the end member 102, molding becomes difficult. A thermoplastic resin such as ABS resin having good moldability is used.

(Problems to be solved by the invention) However, in this case, the pipe 100 and the end member 102
And are formed of different materials, which causes the following problems. As shown in FIGS. 4 and 5, the end member 102 is formed to have substantially the same diameter as the inner diameter of the pipe 100, and is press-fitted into the inner peripheral surface of the end of the pipe 100, and then the inner peripheral portion of the end is preliminarily formed. When the end member 102 and the pipe 100 are made of different materials, they are fixed to each other by an adhesive applied to the surface, but when the environmental temperature of the roller changes (environmental temperature change during transportation exclusively). (−25 ° C. to 120 ° C.), as shown in FIG. 6, the coefficient of thermal expansion A of the pipe 100 (1 × 10 ⁻⁶ / coefficient of linear expansion).
C) and the coefficient of thermal expansion B of the end member 102 (6 × 1 in terms of coefficient of linear expansion)
The difference between 0 ^-5 / ℃), the inner diameter of the pipe 100 (D
₂ ) and the outer diameter (D ₁ ) of the end member 102, and a gap is created on the fitting surface (press-fitting surface) of the end member 102, which causes the interface between them to separate and the end member 102 from the pipe 100. It may fall off or the rotation driving force cannot be transmitted to the pipe 100.

(Means for Solving the Problems) The present invention has been made to solve such problems, and the gist thereof is a resin pipe which is a main body of a transfer roller for transferring an object to be conveyed such as film and paper. In the fixing structure of the end member, the end member made of a resin different from that of the pipe is press-fitted into the inner peripheral surface of the end from the outside in the axial direction, and the end member is fixed with an adhesive applied in advance. An annular or partially annular groove is formed in a region near the tip of the member on the press-fitting side into the pipe, and a portion on the tip side of the groove is formed to have a diameter smaller than the inner diameter of the pipe, and the adhesive is applied inside the groove. It was introduced and solidified.

(Operation and Effect of Invention) As described above, according to the fixing structure of the present invention, the adhesive enters the groove through the gap between the outer peripheral surface of the small diameter portion of the end member and the inner peripheral surface of the pipe. Because of the solidification, the end member does not drop out of the pipe even when a difference in thermal expansion amount or contraction amount occurs between the pipe and the end member due to a change in environmental temperature. This is because the end member is fixed in the axial direction by the engaging action of the groove and the adhesive that enters into the groove and is solidified. In this case, if a flat surface is formed on the outer peripheral surface of the small-diameter portion at the tip of the end member or the bottom surface of the groove, the flat surface serves as an engaging surface for transmitting the driving force, and rotation from the drive device is performed. The driving force is reliably transmitted to the pipe.

In addition, according to the present invention, the adhesive can be introduced into the groove and solidified by simply assembling the end member to the pipe in a state where the adhesive is applied to the inner peripheral surface of the pipe as in the conventional case. Have. That is, there is a feature that the engaging portion for preventing the end member from being pulled out can be formed only by performing the assembling work similar to the conventional one.

(Example) Next, the Example of this invention is described in detail based on drawing.

In FIG. 1, reference numeral 10 denotes a carrying roller in the developing device, which includes a phenol resin pipe 12 and a pipe 1.
A press-fitted to the end of 2 and fixed by an adhesive 14
It is composed of an end member 16 made of BS resin and a metal (stainless steel, titanium, etc.) rotary shaft 18 provided on the end member 16. The rotating shaft 18 is provided with an engaging portion 20 formed by crushing a part of the rotating shaft 18. The engaging portion 20 prevents the rotating shaft 18 from coming off and transmits the driving force from the rotating shaft 18 to the end member 16. Done.

On the other hand, an annular groove 24 is formed near the tip of the end member 16 on the insertion side of the pipe 12. Further, the tip end side of the groove 24 is a disc-shaped portion 2 having a diameter smaller than the inner diameter of the pipe 12.
2, the disk-shaped portion 22 has a flat engagement surface 26 formed by cutting a part of the outer peripheral surface.

To fix the end member 16 to the end of the pipe 12,
An adhesive may be applied to the inner peripheral surface 28 of the end of the pipe 12 in advance, and the end member 16 may be pressed into the pipe 12 from the outside in the axial direction. Thus, when the end member 16 is press-fitted into the pipe 12, the uncured adhesive 14 applied to the inner peripheral surface 28 of the pipe 12 is partially pushed by the end member 16 in the axial direction. At that time, the adhesive 14 is applied to the disk-shaped portion 22.
Through the gap between the inner peripheral surface of the pipe 12 and the inside of the annular groove 24, and is solidified there.

Therefore, according to such a fixing structure, even if the pipe 12 and the end member 16 are bonded and separated from each other due to a change in environmental temperature during transportation of the transport roller, the annular groove 2
The end member 16 does not come off from the pipe 12 due to the action of the adhesive 14 that has solidified by entering the inside of the pipe 4.
Further, due to the action of the flat engagement surface 26 of the disc-shaped portion 22, the driving force is reliably transmitted from the end member 16 to the pipe 12.

When the end member 16 is assembled, if the end member 16 is press-fitted into the pipe 12 and then the pipe 12 is set up with the end member 16 facing downward, the uncured adhesive bond The agent 14 can be made to enter the inside of the annular groove 24 more completely, and the above-mentioned retaining and driving force transmitting action can be more reliably performed.

Although the embodiments of the present invention have been described in detail above, the present invention can be configured in other forms.

For example, in the above example, the groove is formed in an annular shape, but it may be formed in a semi-annular shape or an arc shape, or the groove may be formed slightly oblique to the direction perpendicular to the axis. .

Further, in the above example, the engagement surface is formed in the disc-shaped portion, but by partially cutting the bottom surface of the groove to form a flat surface,
It is also possible to form an engagement surface for transmitting the driving force.

In addition, the end member can be made of PVC or other resin material, or the pipe can be made of resin material other than phenol resin, and the present invention can be applied to a roller for paper feeding in a copying machine or the like. The present invention can be configured in various modified forms based on the knowledge of those skilled in the art without departing from the spirit of the present invention, such as being applicable to a carrying roller.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of an essential part of a carrying roller according to an embodiment of the present invention, and FIG. 2 is a perspective view of an essential part of an end member of the roller. FIG. 3 is a partially cutaway perspective view showing an example of a conventional conveying roller, and FIGS. 4 and 5 are explanatory views for explaining an assembling procedure of the conveying roller of FIG. 3, and FIG. FIG. 6 is a diagram showing a difference in linear expansion coefficient between the pipe and the end member, which is shown for explaining the problem of the transport roller in FIG. 10: Transport roller, 12: Pipe 14: Adhesive, 16: End member 22: Disc-shaped part, 24: Annular groove

Claims (1)

[Scope of utility model registration request] 1. A resin end member, which is different from the pipe, is press-fitted into the inner peripheral surface of the end of a resin pipe, which is the main body of a conveying roller for conveying an object to be conveyed such as film and paper. In the fixing structure of the end member that is fixed by an adhesive applied in advance, an annular or partial annular groove is formed at a portion near the tip of the end member on the press-fitting side of the pipe, and the groove is formed. A fixing structure for an end member in a conveying roller, characterized in that a portion on a more distal end side is formed to have a diameter smaller than an inner diameter of the pipe, and the adhesive is introduced into the groove to be solidified.