JP3365231B2 - Paper feed roller - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feed roller. More specifically, the present invention relates to a paper feed roller used in an automatic teller machine and various OA equipments to feed paper such as bills and paper.

[0002]

2. Description of the Related Art In recent years, the development of various types of office equipment such as automatic teller machines, copiers, printers such as personal computers has been extremely remarkable.

In these office equipments, it is strongly demanded to reliably send out papers one by one. For this reason, various technical ideas have been made for the paper feed roller.

FIG. 8 is a sectional explanatory view showing a conventional paper feed roller used in an automatic teller machine.

In FIG. 8, 1 is a roller body, 2 is a rubber piece, 3 is a toothed portion provided on the outer peripheral surface side of the rubber piece 2,
4 is a rubber piece 2 provided on a part of the outer circumference of the roller body 1.
The concave portion for fitting the concave portion 5 is an adhesive applied to the inner peripheral surface of the concave portion 4, and 18 is a shaft core.

That is, in the conventional paper feed roller used in the automatic teller machine, the toothed portion 3 is provided on the outer peripheral surface side in the concave portion 4 provided on a part of the outer peripheral side of the roller body. The rubber pieces 2 are fitted together, and due to the high friction coefficient peculiar to the rubber of the fitted rubber pieces 2 and the toothed portion 3, the banknotes are reliably sent out one by one.

The integration of the roller body 1 and the rubber piece 2 has been performed as follows.

[0008] Preparation of Roller Body 1 The roller body 1 is manufactured by processing metal, rubber, plastic, ceramic or the like into a predetermined shape.

[0009]. A recess 4 is formed in a part of the outer circumference of the roller body 1.
When the processing roller body 1 is made of metal, the recess 4 for fitting the rubber piece 2 provided on a part of the outer peripheral side of the roller body 1 is first subjected to excavation processing, and then ground by shot blasting or the like. Clean and finally wash with high pressure air, volatile organic solvent, etc.

[0010]. Adhesive is applied to the inner peripheral surface of the concave portion 4 provided on a part of the outer peripheral side of the roller body 1. To the inner peripheral surface of the concave portion 4 provided on a part of the outer peripheral side of the roller body 1 prepared above, metal and rubber are applied. A rubber / metal adhesive 5 that can strongly adhere to and is applied.

[0011]. Recesses 4 coated with adhesive 5 in the mold
Set the roller body 1 having the above. The roller body 1 having the concave portion 4 coated with the adhesive 5 is set in a predetermined mold.

[0012]. Molding of rubber piece 2 Next, liquid polyurethane rubber is injected into the mold prepared above, and then molded and vulcanized while pressing at high temperature and high pressure.

By this molding and vulcanization, the rubber piece 2 is placed in the recess 4.
Is strongly bonded and molded.

Although liquid polyurethane rubber is used as the rubber material here, other liquid rubber or other solid rubber can be used.

.. Precision machining of the tooth mold part 3 formed on a part of the outer peripheral surface of the rubber piece 2 By a grinding stone process or the like so that the runout when the paper feed roller rotates the tooth mold part 3 is minimum, for example, 0.04 mm or less Precisely finish.

In the manufacturing method which goes through the steps 1 to 3, the rubber piece 2 is placed in the recess 4 provided in a part of the outer peripheral side of the roller body.
Can be strongly adhered under high temperature and high pressure, which is a preferable method from the viewpoint of adhesiveness.

However, in the manufacturing method which goes through the steps 1 to 5, there are many manufacturing steps and an adhesive applying step is included in those manufacturing steps, so that the cleaning conditions for the recesses 4, the storage conditions for the adhesive, and the applying conditions for the adhesive are included. However, it takes a lot of man-hours to manage the pre-drying conditions and the adhesive curing conditions, and as a result, it has been extremely difficult to improve productivity.

[0018]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object thereof is to solve the above-mentioned drawbacks of the prior art, to reduce the number of manufacturing steps, and to use an adhesive. It is an object of the present invention to provide a novel paper feed roller that can significantly improve productivity as a result.

[0019]

The gist of the present invention consists of a roller body having a notch in a part of its outer peripheral surface, and a rubber piece for paper feeding fitted in the notch. The rubber piece is accommodated in the notched portion in a compressed state by having a size larger than the notched portion, and one of the lower surface of the rubber piece and the bottom portion of the notched portion is Swells in an arc shape against a flat opponent
In the paper feed roller, the rubber pieces are in close contact with each other by bulging in an arc shape with respect to the other party, and the outer peripheral side of the rubber piece is ground.

[0020]

In the present invention, the roller body is made of metal,
Plastic, ceramic, etc. can be used.

In the present invention, as the material of the rubber piece, polyurethane rubber, chloroprene rubber, ethylene propylene diene rubber, chlorosulfonated polyethylene rubber, or various thermoplastic elastomers can be used.

Here, it is necessary to form the rubber piece into a predetermined shape in advance before it is integrated as a paper feed roller.

In the present invention, the size of the rubber piece is preferably 5 to 35% larger than the internal volume in the cutout. This is because when the size of the rubber piece is 5% or less of the volume in the cutout portion, popping-out failure is likely to occur, and conversely, when the size of the rubber piece is 35% or more, it is difficult to accommodate it in the cutout portion.

Further, in the present invention, the hardness of the rubber piece is J
A material having an IS-A hardness of 20 to 80 is suitable. This is because the following ones are too soft and pop out from the inside of the notch. On the contrary, when the number exceeds 80, they are too hard and the paper feeding property deteriorates sharply.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the paper feed roller of the present invention will be described.

(First Embodiment) FIG. 1 is a sectional explanatory view showing a first embodiment of the paper feed roller of the present invention.

In FIG. 1, 1 is a roller body made of plastics, 3 is a tooth profile provided along the outer peripheral surface side,
Reference numeral 11 denotes a cutout portion provided in a part of the outer circumference of the roller body 1 made of plastics, and 14 denotes a large-sized rubber piece having a volume larger than the internal volume of the cutout portion 11.

Here, the toothed portion 3 provided along the outer peripheral surface side of the large-sized rubber piece 14 is ground by a precision rotating grindstone so as to have the same height as the outer diameter of the roller body 1.

FIG. 2 is a cross-sectional explanatory view showing each dimension measurement position of the plastic roller body 1 of FIG.

In FIG. 2, the outer diameter of the plastic roller body 1 is 40 mm.

Further, as can be seen from FIG. 2, the cutout portion 11 is composed of a flat bottom portion 12 and overhang portions 13 and 13 protruding from the left and right. The bottom portion 12 has an A dimension of 22.0 mm, the bottom portion has a B dimension of 6.0 mm, and the top portion has a C dimension of 18.0 mm.

FIG. 3 is a sectional explanatory view showing a large-sized rubber piece 14 having a volume larger than the internal volume of the cutout portion 11 of FIG.

The large-sized rubber piece 14 is made of polyurethane rubber having JIS-A hardness of 60, the tooth mold 3 is provided on the outer peripheral side thereof, and the bottom side thereof has a shape 16 expanded in an arc shape. Has become. Here, the size of each part is 23.0 mm for the A'part, 6.8 mm for the B'part, and 0.2 mm for the D size.

The thus-obtained paper feed roller of the first embodiment of the present invention has a structure that can be easily manufactured. Therefore, the number of manufacturing steps is small and an adhesive is not used. The productivity could be significantly improved. Further, the runout of the paper feed roller of the first embodiment of the present invention during rotation was as small as 0.02 mm, and the connection between the notch 11 and the large-sized rubber piece 14 was strong, and its high quality was confirmed.

(Second Embodiment) FIG. 4 is a cross-sectional explanatory view showing each dimension measuring position of a roller body 1 made of plastics used in a second embodiment of the paper feed roller of the present invention.

In FIG. 4, the outer diameter of the roller body 1 made of plastics is 40 mm as in the first embodiment.

Further, as can be seen from FIG. 4, the cutout portion 11 has an arcuate bulging bottom portion 19 which bulges upward in an arcuate shape.
And overhang portions 13, 13 protruding from the left and right. The A dimension of the bottom is 22.0 mm, the B dimension of the bottom is 6.0 mm, and the C dimension of the top is 1
It is 8.0 mm and the E dimension is 0.2 mm.

FIG. 5 is a sectional explanatory view showing a large-sized rubber piece 20 having a volume larger than the internal volume of the cutout portion 11 of FIG.

The large-sized rubber piece 20 is made of polyurethane rubber having JIS-A hardness of 60, the toothed portion 3 is provided on the outer peripheral side thereof, and the flat bottom portion 23 thereof is flat. Here, the dimensions of each part are 23.
0 mm, B'section is 6.8 mm.

Next, after fitting and integrating these, the tooth mold portion 3 on the outer peripheral side of the large-sized rubber piece 20 was ground by a precision rotary grindstone so as to have the same height as the outer diameter of the roller body 1.

The paper feed roller of the second embodiment of the present invention thus obtained has a structure which can be easily manufactured as in the case of the first embodiment. Therefore, the number of manufacturing steps is small and an adhesive is used. As a result, the productivity could be remarkably improved. Further, the runout of the paper feed roller of the first embodiment of the present invention during rotation was as small as 0.03 mm, and the connection between the notch 11 and the large-sized rubber piece 20 was strong, and its high quality was confirmed.

(Third Embodiment) FIG. 6 is a cross-sectional explanatory view showing each dimension measuring position of a roller body 1 made of plastics used in a third embodiment of the paper feeding roller of the present invention.

In FIG. 6, the outer diameter of the roller body 1 made of plastics is 40 mm as in the first embodiment.

Further, as can be seen from FIG. 6, the cutout portion 11 has an arcuate bulging bottom portion 19 which bulges upward in an arcuate shape.
And overhang portions 13, 13 protruding from the left and right. The A dimension of the bottom is 22.0 mm, the B dimension of the bottom is 6.0 mm, and the C dimension of the top is 1
It is 8.0 mm and the E dimension is 0.2 mm.

FIG. 7 is a sectional explanatory view showing a large-sized rubber piece 14 having a volume larger than the internal volume of the cutout portion 11 of FIG.

This large-sized rubber piece 14 is made of polyurethane rubber having JIS-A hardness of 60 as in the case of the first embodiment, the toothed portion 3 is provided on the outer peripheral side thereof, and the bottom side thereof is a circle. The shape 16 is expanded in an arc shape. Here, the size of each part is 23.0 mm for A'part,
The B'section is 6.8 mm and the D dimension is 0.2 mm.

Next, after fitting and integrating these, the tooth pattern portion 3 on the outer peripheral side of the large-sized rubber piece 14 was ground by a precision rotary grindstone so as to have the same height as the outer diameter of the roller body 1.

The thus obtained paper feeding roller of the third embodiment of the present invention has a structure which can be easily manufactured similarly to the first embodiment, and therefore has a small number of manufacturing steps and uses an adhesive. As a result, the productivity could be remarkably improved. Further, the runout of the paper feed roller of the third embodiment of the present invention during rotation was as small as 0.05 mm, and the notch 11 and the large-sized rubber piece 14 were strongly joined together, and its high quality was confirmed.

(First Comparative Example) FIG. 9 is a partially enlarged sectional view showing a paper feed roller of a first comparative example.

In FIG. 9, 1 is a roller body made of plastic, 3 is a tooth-shaped portion provided along the outer peripheral surface side, 1
2 is a flat bottom portion, 13 and 13 are overhang portions protruding from the left and right, 23 is a flat bottom portion , 17 is a void portion generated by fitting, and 22 is provided in a part of the outer periphery of the plastic roller body 1. The cutout portion 21 has the same size, and the rubber piece 21 has the same size.

Here, the tooth pattern portion 3 provided along the outer peripheral surface side of the rubber piece 21 of the same size is ground by a precision rotary grindstone so as to have the same height as the outer diameter of the roller body 1.

FIG. 10 is an explanatory sectional view showing each dimension measurement position of the plastic roller body 1 of FIG.

In FIG. 10, the outer diameter of the roller body 1 made of plastics is 40 mm. Further, as can be seen from FIG. 10, the notch 22 having the same size is composed of a flat bottom portion 12 and overhang portions 13 and 13 protruding from the left and right. The A dimension of the bottom portion 12 is 22.0 mm, the B dimension of the bottom portion side is 6.0 mm, and the C dimension of the upper portion is 18.0.
mm.

FIG. 11 is a sectional explanatory view showing the rubber piece 21 of the same size in FIG.

This rubber piece 21 of the same size is made of polyurethane rubber having a JIS-A hardness of 60, a tooth mold portion 3 is provided on the outer peripheral side thereof, and the bottom surface side thereof has a flat bottom portion 2.
It is 3 . Here, the size of each part is 2 for A '
The length is 3.0 mm and the B'section is 6.8 mm.

The thus-obtained paper feed roller of the first comparative example has a structure that can be easily manufactured. Therefore, the number of manufacturing steps is small and an adhesive is not used. As a result, productivity is improved. It was possible to improve remarkably.

However, the paper feed roller of the first comparative example is
The flatness of the notch 22 of the same size of the plastic roller body 1
A space 17 was generated by fitting between the flat bottom 12 and the flat bottom 23 of the rubber piece 21 of the same size. This void 17
Occurs when the rubber piece 21 of the same size housed in the notch 22 of the same size in a compressed state tries to escape from the portion C shown in FIG.
This causes the bottom surface 16 to float.

Further, the paper feed roller of the first comparative example has the above-mentioned gap 1 when it comes into contact with the grindstone in the grinding step of the grindstone.
7 is deformed so as to be eliminated, and when the grindstone is separated next time, it is restored to the original shape, and such deformation further increases the runout.

For this reason, the paper feed roller of the first comparative example has a large runout of 0.16 mm when the roller is rotated,
It turned out that it could not be put to practical use.

(Supplementary Explanation of Examples) In the present invention, the large-sized rubber piece 14 is expanded in an arc shape.
Flat shape 23 of the bent shape 16 or the large-sized rubber piece 20
And the bottom of the cutout portion 11 bulges one or both of them in an arc shape with respect to the other party. The purpose is to bulge the large sized rubber piece 14 in the arc shape 16 or the large sized rubber piece 20. It is to effectively prevent the flat bottom 23 from rising. As a result, the paper feed roller of the present invention can make the shake during rotation extremely small.
In addition, in the first embodiment of the present invention, the flat bottom portion 12 of the cutout portion 11 may be expanded downward in an arc shape. In this case, expand the large-sized rubber piece 14 in an arc shape.
The bulge of the formed shape 16 is made smaller.

[0062]

The paper feed roller of the present invention has a structurally small manufacturing process and can be manufactured without using an adhesive, and as a result, the productivity of the paper feed roller can be remarkably improved. The obtained paper feed roller has very little run-out during rotation and has a strong bond between the notch and the rubber piece, and is industrially useful.

[Brief description of drawings]

FIG. 1 is a sectional explanatory view showing a first embodiment of a paper feed roller of the present invention.

FIG. 2 is a cross-sectional explanatory view showing each dimension measurement position of the plastic roller main body of FIG.

3 is a cross-sectional explanatory view showing a large-sized rubber piece having a volume larger than the internal volume of the cutout portion of FIG.

FIG. 4 is a cross-sectional explanatory view showing each dimension measurement position of a plastic roller body used in a second embodiment of the paper feed roller of the present invention.

5 is a cross-sectional explanatory view showing a large-sized rubber piece having a volume larger than the internal volume of the cutout portion of FIG.

FIG. 6 is a cross-sectional explanatory view showing each dimension measurement position of a plastic roller main body used in a third embodiment of the paper feed roller of the present invention.

7 is a cross-sectional explanatory view showing a large-sized rubber piece having a volume larger than the internal volume of the cutout portion of FIG.

FIG. 8 is a cross-sectional explanatory view showing a conventional paper feed roller used in an automatic teller machine.

FIG. 9 is a partially enlarged cross-sectional explanatory view showing a paper feed roller of a first comparative example.

10 is a cross-sectional explanatory view showing each dimension measurement position of the plastic roller body of FIG.

11 is a cross-sectional explanatory view showing a rubber piece 21 of the same size in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 roller body 2 rubber piece 3 tooth section 4 recess 5 adhesive 11 notch 12 flat bottom 13 overhang 14 and 20 large-sized rubber piece 16 arcuately expanded shape 17 void 18 shaft core 19 arc Swelled bottom 21 Rubber piece 22 of the same size Cutout 23 of the same size Flat bottom

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Fumifumi Nara 3-1-1 Sukegawa-cho, Hitachi-shi, Ibaraki Inside the electric wire factory of Nitate Electric Cable Co., Ltd. (56) Reference JP-A-3-147632 (JP, A) JP 7-304530 (JP, A) JP 64-2943 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B65H 3/06 330

Claims (2)

(57) [Claims] 1. A roller main body having a cutout portion on a part of an outer peripheral surface thereof, and a rubber piece for paper feeding fitted in the cutout portion, the rubber piece having a size larger than the cutout portion. The bottom surface of the rubber piece and the bottom portion of the cutout portion are accommodated in a compressed state in the cutout portion by having an arc shape with respect to a flat counterpart.
Inflated by either closely or with both closely swells in an arc shape relative to the other party, the rubber piece, the paper feed roller, characterized in that it is grinding the outer peripheral side thereof. 2. The paper feed according to claim 1, wherein the rubber piece has a JIS-A hardness of 20 to 80 and a size which is 5 to 35% larger than the internal volume of the cutout portion. roller.