JP2000118775A - Paper feed roller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce weight of a paper feed roller with a large diameter by using a cylindrical pipe as the paper feed roller and making a small-diameter cylindrical part projected from each of the ends of the cylindrical pipe as a rotational supporting shaft for the cylindrical pipe. SOLUTION: The whole part excepting a cylindrical pipe 5 serving as a paper feed roller is constructed of a drawn part 6 by a press. In the drawn part 6 formed from a thin plate material or a thin plate pipe, a large-diameter cylindrical part 7 and a small-diameter cylindrical part 8 are integrally molded coaxially while putting a flange type connection part 9 between them. When the large-diameter cylindrical part 7 is fitted in the end part opening of the cylindrical pipe 5, the drawn part 6 is integrated to the cylindrical pipe 5 by an adhesive or welding so as to be assembled as a paper feed roller 4. In the assembled body, the cylindrical pipe 5 serves as a paper feed roller, while the small-diameter cylindrical part 8 in the drawn part 6 serves as a rotational supporting shaft for the cylindrical pipe 5. In the paper feed roller 4, the whole part is formed of a hollow cylindrical body, so that it can be produced with light weight in spite of increase in the diameter as it has no solid part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light-weight structure of a paper feed roller used mainly in a printer, a copying machine and the like.

[0002]

2. Description of the Related Art A paper feed roller has a structure in which shafts serving as rotating shafts are attached to both ends of a roller body. For mounting the shaft, for example, as shown in FIG. 9, a cylindrical block 2 having an outer diameter slightly larger than the inner diameter of the cylindrical pipe is press-fitted into both end openings of a roller main body 1 formed of a cylindrical pipe.
This is performed by inserting and fixing the shaft 3 into the cylindrical block 2.

[0003]

With the recent increase in printing speed of printers, copiers and the like, the paper feed speed has increased, and in order to cope with this, it has been necessary to increase the diameter of the paper feed roller.

However, as shown in FIG. 9, in the structure using the cylindrical block 2 which is a solid part, the increase in the roller diameter is directly linked to the increase in the weight of the paper feed roller, and the weight of the device such as a printer is reduced. In addition, problems such as hindering reduction in power consumption are caused.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a paper feed roller having a reduced weight and a large diameter.

[0006]

According to the present invention, there is provided a hollow press-drawn part obtained by drawing a thin plate or a thin pipe.
The paper feed roller is provided with a lightweight structure.
There are two inventions.

(1) The invention according to claim 1 comprises a press drawing part in which a large-diameter cylindrical portion, a flange-like connecting portion, and a small-diameter cylindrical portion are integrally formed coaxially from a thin plate or a thin plate, and a cylindrical pipe. The large-diameter cylindrical part of the press drawing part is fitted to the opening end of the cylindrical pipe, and is joined and integrated by an adhesive or welding. The cylindrical pipe is used as a paper feed roller, and the small-diameter cylindrical part protrudes from both ends of the cylindrical pipe. Is a rotation support shaft of a cylindrical pipe.

According to the above configuration, all parts of the paper feed roller are constituted by cylindrical bodies, and no heavy solid parts are used at all, so that the weight can be reduced.

(2) The invention according to claim 2 is a press drawing part in which a large-diameter cylindrical portion, a flange-like connecting portion, and a small-diameter cylindrical portion are integrally formed coaxially from a thin plate or a thin plate pipe; A large-diameter cylindrical portion of the press-drawn part is fitted to the open end of the cylindrical pipe, and bonded and integrated by an adhesive or welding, and the small-diameter cylinder is formed so that the shaft projects outside the cylindrical pipe. A paper feed roller, wherein the cylindrical pipe is a paper feed roller.

In this configuration, parts other than the shaft are composed of a cylindrical body, and the press drawing part connecting the shaft and the cylindrical pipe is a cylindrical body, and is not a solid part, so that the weight can be reduced.

(3) A plurality of press-drawn parts in which the large-diameter cylindrical portion, the flange-shaped connecting portion, and the small-diameter cylindrical portion are integrally formed coaxially from a thin plate or a thin plate pipe.
A paper feed roller comprising a shaft, wherein a small-diameter cylindrical portion of each press drawing component is externally fitted and fixed to the shaft, and the large-diameter cylindrical portion is used as a paper feed roller.

In this structure, a press drawn part formed by drawing from a thin plate or a thin pipe is fitted to a shaft having a small diameter, and the large-diameter cylindrical portion is used as a paper feed roller. For this reason, there is no solid part between the paper feed roller and the shaft, so that the weight can be reduced, and at the same time, the cost can be reduced because there is no need to prepare a separate cylindrical pipe for the paper feed roller.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A paper feed roller 4 shown in FIG. 1 is an embodiment of the invention according to claim 1, wherein all parts other than a cylindrical pipe 5 serving as a paper feed roller are pressed by a press drawing part 6. Constitute. The press drawn part 6 is formed by coaxially forming a large-diameter cylindrical portion 7 and a small-diameter cylindrical portion 8 coaxially with a flange-shaped connecting portion 9 therebetween by drawing from a thin plate material or a thin plate pipe. The press drawn part 6 has its large-diameter cylindrical part 7 fitted into the end opening of the cylindrical pipe 5, is integrated with the cylindrical pipe 5 by an adhesive or welding, and is assembled as the paper feed roller 4. In this assembly, the cylindrical pipe 5
Is a paper feed roller, and the small-diameter cylindrical part 8 of the press drawing part
Is a rotation support shaft of the cylindrical pipe 5.

The paper feed roller 4 has a hollow cylindrical body in its entirety and has no solid parts, so that it can be manufactured lightweight even if the diameter is increased.

The press drawn part 6 may be manufactured from a thin plate material or a thin pipe.

FIG. 2 shows the steps in the case of manufacturing from a flat thin plate. First, a small-diameter cylindrical portion 8 having a cylindrical shape with a bottom as a shaft is formed on a flat thin plate material 10 by drawing. Next, the large-diameter cylindrical portion 7 is formed by drawing around the small-diameter cylindrical portion 8 with an interval corresponding to the width of the flange-shaped connecting portion 9. Further, trimming is performed to remove the large-diameter cylindrical portion 7.
Is shaped so that the length becomes a predetermined length, and the production is completed.

FIG. 3 shows a process for manufacturing the press drawn part 6 from a thin plate pipe. First, a cylindrical pipe 11 having the same diameter as the large-diameter cylindrical portion 7 of the press drawn part 6 to be manufactured is prepared, and cut off to a fixed size according to the size of the pressed drawn part 6 to be manufactured. Next, the small-diameter cylindrical portion 8 and the flange-like connecting portion 9 are formed by drawing, and further, the tip of the small-diameter cylindrical portion 8 is bent inward to form the bottom surface 8a of the small-diameter cylindrical portion 8, thereby completing the production.

In the embodiment of FIG. 1 described above, the small-diameter cylindrical portion 8 of the press-drawn part is used as a shaft. However, a shaft can be separately prepared and fixed to the pressed-drawn part. This structure is shown in FIGS. 4A and 5B and FIGS. 5A and 5B as the second embodiment of the invention.

The paper feed roller 12 shown in FIGS.
In this example, a cylindrical pipe 13 serving as a paper feed roller and a shaft 14 serving as a rotation axis of the cylindrical pipe 13 are connected by a press drawing part 15a (15b). The press drawn part 15a (15b) is formed by connecting a large-diameter cylindrical part 16 and a small-diameter cylindrical part 17 to a flange-like connecting part 18 from a thin plate or a thin pipe.
And coaxially integrally formed by drawing,
The small-diameter cylindrical portion 17 in FIG. 4A extends from the flange-like connecting portion 18 in the same direction as the large-diameter cylindrical portion 16 to form a double tube.
The small-diameter cylindrical portion 17 shown in FIG. 4B extends from the flange-shaped connecting portion 18 in a direction opposite to the large-diameter cylindrical portion 16.

The assembling of the paper feed roller 12 is performed, for example, by first fitting the small-diameter cylindrical portion 17 of the press-drawing component 15a (15b) to the shaft 14 and fixing it with an adhesive or welding. Large-diameter cylindrical part 1 of parts
This is performed by externally fitting to 6 and fixing with an adhesive or welding.

In the embodiment shown in FIGS. 4A and 4B, one shaft 14 is attached so as to penetrate the entire length of the cylindrical pipe 13.
3 can be separately attached to the end portions to further reduce the weight. An embodiment in this case is shown in FIGS.

The embodiment of FIGS. 5A and 5B is similar to that of FIG.
(A) The same press drawn parts 15a (15b) as (b)
Use The assembling uses a short shaft 20 provided with a flange-shaped locking portion 19 at one end, and press-drawn parts 15 (15b).
Is press-fitted and fixed from inside to outside in the small-diameter cylindrical portion 17. Thereafter, the press drawing parts 15a (15b) and the cylindrical pipe 13 are joined in the same manner as the sheet feeding roller 12 in FIG. 4 to form the sheet feeding roller 12a.

FIG. 6 shows an example of a process in the case where the press drawn part 15a used in the embodiment of FIGS. 4 and 5 is manufactured from a thin plate material. First, the bottomed cylindrical body 22 is formed from the thin plate material 21 by drawing according to the outer diameter of the large-diameter cylindrical portion 16 of the press drawn part to be formed. Next, a cylindrical recess 24 is formed in the bottom plate portion 23 of the bottomed cylindrical body 22 by drawing. Then, the bottom portion 24a of the cylindrical concave portion 24
The bent portion of the bottom surface portion 24a remaining after the opening is extended by burring to form a cylindrical recess 24.
Into a complete cylinder. Next, the opening end of the large-diameter cylindrical portion 22 is trimmed, and shaping and length adjustment are performed, thereby completing the production.

The press drawn parts 15a used in FIGS. 4 (a) and 4 (b) and FIGS. 5 (a) and 5 (b) can be drawn from a thin pipe. This drawing is performed, for example, by preparing a thin pipe having the same diameter as the large-diameter cylindrical section 16 and drawing one end of the thin pipe so as to be bent inward.

FIG. 1, FIG. 4 (a) (b), FIG. 5 (a)
The embodiment (b) has a structure in which a separately prepared cylindrical pipe is used as a paper feed roller, but a structure in which the large-diameter cylindrical portion 16 of the press drawing part 15a (15b) is used as a paper feed roller. You can also. This is shown in FIGS. 7 and 8 as an embodiment of the invention according to claim 3.

In the embodiment shown in FIG. 7, a plurality of press drawing parts 15a are dispersed and fixed on one shaft 21 to form a feed roller 26, and the small-diameter cylindrical portion 17 of the press drawing part 15a is fixed to the shaft 21. Externally fitted at an interval, and fixed by, for example, an adhesive or welding.

In the embodiment shown in FIG. 8, the two press drawing parts 15a, 15a are joined with the open ends of the large-diameter cylindrical portion 16 facing each other by spot welding or the like.
To form a paper feed roller 27. This fixing is performed by fitting the small-diameter cylindrical portion 17 to the shaft 21 and by, for example, an adhesive or welding. In this embodiment, a plurality of pairs of press drawing parts 15a, 15a can be arranged in a distributed manner on one shaft.

In the embodiment shown in FIGS. 7 and 8, the paper is fed by contact with a part of the paper surface, and the large-diameter cylindrical portion 16 of the press drawing part 15a serves as a paper feed roller. Since there is no need to prepare, the cost of this part can be reduced.

In the embodiment shown in FIGS. 7 and 8, the small-diameter cylindrical portion 17 is used instead of the press drawing part 15a.
It is also possible to use a press drawing component 15b that extends from the flange-shaped connecting portion 18 to the opposite side to the large-diameter cylindrical portion 16.

Further, the above-described paper feed rollers 4, 1
2, 12a, 26, 27, the surface finish of the paper feeding surface,
For example, it can be performed by plating after centerless polishing.

[0031]

The present invention uses a hollow press-drawing part obtained by drawing a thin plate material or a thin plate pipe, using a paper feed roller,
The shaft and the connecting part are formed by press drawing parts, the connecting part is formed by press drawing parts, and the paper feed roller and the connecting part are pressed against the paper feed roller formed by the shaft and the connecting part of the roller and the shaft. Since the three assembling structures, which are constituted by the squeezing parts, are provided, the large-diameter paper feed roller can be manufactured with a reduced weight.

[Brief description of the drawings]

FIG. 1 is a half sectional view showing an embodiment of the first invention of the present invention.

FIG. 2 is a view showing an example of a processing procedure when manufacturing a press-drawn part used in the embodiment of FIG. 1 from a thin plate material.

FIG. 3 is a view showing an example of a processing procedure in a case where a press drawn part used in the embodiment of FIG. 1 is manufactured from a thin pipe.

FIG. 4 is a half sectional view showing a second embodiment of the present invention.

FIG. 5 is a half sectional view showing another embodiment of the second invention of the present invention.

FIG. 6 is a view showing an example of a processing procedure in the case of manufacturing a press-drawn part used in the embodiment of FIGS. 4 and 5 from a thin plate material.

FIG. 7 is a half sectional view showing an embodiment of the third invention of the present invention.

FIG. 8 is a half sectional view showing another embodiment of the third invention of the present invention.

FIG. 9 is a half sectional view showing an example of a conventional structure of a paper feed roller.

[Explanation of symbols]

 4, 12, 12a, 26, 27 Paper feed roller 5 Cylindrical pipe (paper feed roller) 6, 15a, 15b Press drawing part 7, 16 Large diameter cylindrical part 8, 17 Small diameter cylindrical part 9, 18, Flange connection part 10, 21 Thin sheet material 11 Thin pipe 14, 20, 21 Shaft

Claims (3)

[Claims] 1. A press drawn part in which a large-diameter cylindrical part, a flange-shaped connecting part, and a small-diameter cylindrical part are integrally formed coaxially from a thin plate or a thin pipe, and a cylindrical pipe. The cylindrical part is fitted to the open end of the cylindrical pipe, and is integrally formed by bonding or bonding with an adhesive or welding.The cylindrical pipe is used as a paper feed roller, and the small-diameter cylindrical part protruding from both ends of the cylindrical pipe is connected to the rotation support shaft of the cylindrical pipe. Paper feed roller characterized by the following. 2. A press drawing part in which a large-diameter cylindrical portion, a flange-like connecting portion, and a small-diameter cylindrical portion are coaxially formed from a thin plate or a thin plate, a cylindrical pipe, and a shaft,
The large-diameter cylindrical part of the press drawing part is fitted to the open end of the cylindrical pipe, and joined and integrated by an adhesive or welding.
A paper feed roller, wherein the shaft extends through a small-diameter cylindrical portion so as to protrude outward from the cylindrical pipe, and the cylindrical pipe serves as a paper feed roller. 3. A plurality of press-drawn parts in which a large-diameter cylindrical part, a flange-like connecting part, and a small-diameter cylindrical part are integrally formed coaxially from a thin plate or a thin pipe, and a shaft. A paper feed roller, wherein a cylindrical portion is externally fixed to a shaft, and the large-diameter cylindrical portion is a paper feed roller.