CN110826650A

CN110826650A - Conveying roller, card reader and manufacturing method of card reader

Info

Publication number: CN110826650A
Application number: CN201910734827.8A
Authority: CN
Inventors: 藤森宥至; 平林昌彦
Original assignee: Nidec Sankyo Corp
Current assignee: Nidec Sankyo Corp
Priority date: 2018-08-10
Filing date: 2019-08-09
Publication date: 2020-02-21
Also published as: JP2020026338A

Abstract

The invention provides a conveying roller with excellent oil resistance and hydrolysis resistance, a card reader with the conveying roller and a manufacturing method of the card reader. In the card reader, a roller surface (310) of a conveying roller (31) for conveying a card is composed of a rubber member (32). The rubber member (32) is composed of a blended rubber containing a first rubber material composed of a hydrogenated nitrile rubber (H-NBR) and a second rubber material different from the hydrogenated nitrile rubber. The second rubber material is, for example, ethylene propylene diene terpolymer rubber (EPDM). Therefore, a conveying roller (31) with excellent oil resistance, hydrolysis resistance and clamping force (conveying force) can be realized, and the cost can be reduced because the EPDM which is general-purpose rubber is blended. The rubber member (32) has a blending ratio of (H-NBR) to (EPDM) of, for example, (1:3 to 3:1) in terms of volume ratio.

Description

Conveying roller, card reader and manufacturing method of card reader

Technical Field

The present invention relates to a conveying roller for conveying a card on which information is recorded, a card reader, and a method of manufacturing the card reader.

Background

In the card reader, a card on which information such as magnetic information is recorded is conveyed from an input port to a sensing position of a sensor by a conveying mechanism provided with a conveying roller. The roller surface of the conveying roller contacting with the card is composed of a rubber member. Therefore, the rubber member constituting the roller surface is required to have mechanical strength such as strength and abrasion resistance, and therefore, urethane rubber or the like has been conventionally used as the rubber member (see patent document 1).

Documents of the prior art

Patent document

Patent document 1: japanese patent application laid-open No. 2010-272008

Disclosure of Invention

Technical problem to be solved by the invention

Chemical resistance is also required because the card is used in various environments. For example, when the card reader is used in a gas station or the like, gasoline, kerosene, or the like may adhere to the card, and in this case, the rubber member constituting the roller surface of the conveying roller is required to have oil resistance. In addition, the inventors of the present application have obtained the following new findings: hydrolysis of the urethane rubber is a factor for deterioration of the urethane rubber constituting the roll surface. Specifically, the following findings were obtained: when cosmetics such as sebum oil or hand cream of a person attached to the hand of a person who contacts the card pass through the roller surface of the transfer roller, the urethane rubber constituting the roller surface is hydrolyzed by the oxide of the sebum oil or acid substances contained in the cosmetics, and the transfer roller is deteriorated.

Based on the above-described findings, an object of the present invention is to provide a conveying roller having excellent oil resistance and hydrolysis resistance, a card reader including the conveying roller, and a method for manufacturing the card reader.

Means for solving the technical problem

In order to solve the above-described problems, the present invention is a transport roller that transports a card by rotating under a driving force from a driving source, the transport roller including a rubber member that forms a roller surface that comes into contact with the card, the rubber member being made of a blended rubber that includes at least a first rubber material made of hydrogenated nitrile rubber and a second rubber material different from the hydrogenated nitrile rubber.

The first rubber material (hydrogenated nitrile rubber) used for the rubber member of the conveying roller according to the present invention is a rubber material in which a double bond remaining in the main chain is reduced by subjecting nitrile rubber to a hydrogenation reaction, and unlike urethane rubber, does not have an ester bond. Therefore, the hydrogenated nitrile rubber is less likely to undergo hydrolysis by an acid, and is excellent in hydrolysis resistance. Hydrogenated nitrile rubber is superior to nitrile rubber in heat resistance, weather resistance, and chemical resistance, and is superior to urethane rubber in gasoline resistance. However, the price of hydrogenated nitrile rubber is high. Therefore, if the rubber material of the conveyance roller is made of hydrogenated nitrile rubber alone, although the characteristics better than the required level can be obtained, there is a problem that the cost increases. However, in the present invention, since the rubber member constituting the roller surface is made of a blended rubber containing a hydrogenated nitrile rubber (first rubber material) and a second rubber material, it is possible to reduce the cost to an appropriate level while ensuring excellent characteristics as a conveyance roller.

In the present invention, the second rubber material may be made of a rubber material having a polarity lower than that of the hydrogenated nitrile rubber. Since hydrogenated nitrile rubber is excellent in gasoline resistance and the like, a rubber material slightly inferior in gasoline resistance and the like may be used as the second rubber material. The index of "polarity" used herein includes the SP (Solubility Parameter) value, and the second rubber material can be made of a rubber material having a SP value smaller than that of hydrogenated nitrile rubber.

In the present invention, it is possible to adopt a mode in which the second rubber material is an ethylene propylene diene terpolymer. The SP value of the hydrogenated nitrile rubber is 17.6-21.5 MP^1/2Can use SP value of 16.5-17.5 MP^1/2As the second rubber material. The ethylene propylene diene terpolymer rubber is a general rubber material used in wide fields, and has low cost. Thus, the ethylene propylene diene terpolymer rubber is effective for cost reduction and is suitable for use in a blend rubber with a hydrogenated nitrile rubber.

In the present invention, the blending ratio of the first rubber material to the second rubber material may be 1:3 to 3:1 in terms of a volume ratio. In the present invention, the blending ratio of the first rubber material to the second rubber material may be 1:1 to 3:1 in terms of a volume ratio.

The carrying roller to which the present invention is applied can be used for a card reader. The card reader can be provided with: an input port through which the card is input; a sensor for reading information recorded on the card; and a carrying mechanism for carrying the card introduced from the input port to a sensing position of the sensor by the carrying roller.

In the card reader manufacturing method according to the present invention, it is possible to determine a blending ratio of the first rubber material to the second rubber material in the rubber member according to a use environment of the card reader.

Effects of the invention

The first rubber material (hydrogenated nitrile rubber) used for the rubber member of the conveying roller according to the present invention is a rubber material in which a double bond remaining in the main chain is reduced by subjecting nitrile rubber to a hydrogenation reaction, and unlike urethane rubber, does not have an ester bond. Therefore, hydrolysis and the like by acid are less likely to occur, and hydrolysis resistance is excellent. Hydrogenated nitrile rubber is superior to nitrile rubber in heat resistance, weather resistance, and chemical resistance, and is superior to urethane rubber in gasoline resistance. However, the price of hydrogenated nitrile rubber is high. Therefore, if the rubber material of the conveyance roller is made of hydrogenated nitrile rubber alone, although the characteristics better than the required level can be obtained, there is a problem that the cost increases. However, in the present invention, since the rubber member constituting the roller surface is made of a blended rubber containing a hydrogenated nitrile rubber (first rubber material) and a second rubber material, it is possible to reduce the cost to an appropriate level while ensuring excellent characteristics as a conveyance roller.

Drawings

Fig. 1 is an explanatory diagram schematically showing a configuration of a card reader according to an embodiment of the present invention.

Fig. 2 is an explanatory view showing a specific example of the conveyance roller shown in fig. 1.

Fig. 3 is an explanatory view showing a relationship between the material of the rubber member shown in fig. 2 and the results of various tests.

Fig. 4 is an explanatory diagram showing a relationship between a material of the rubber member shown in fig. 2 and an amount of change in the outer diameter of the rubber member when immersed in various solvents.

Fig. 5 is an explanatory diagram showing a relationship between a material of the rubber member shown in fig. 2 and a clamping force.

Fig. 6 is an explanatory diagram showing a relationship between the material of the rubber member shown in fig. 2 and the rubber hardness at the time of temperature change.

Description of the symbols

1 … card reader, 2 … card, 10 … door part, 11 … inlet, 12 … insertion path, 13 … detector, 14 … pre-reading head, 20 … device body, 21 … sensor, 22 … conveying path, 30 … conveying mechanism, 31 … conveying roller, 32 … rubber component, 33 … supporting component, 34 … driving force transmission mechanism, 35 … first belt mechanism, 36 … second belt mechanism, 38 … motor, 39 … pressing roller, 310 … roller surface

Detailed Description

Embodiments of a card reader and a conveying roller to which the present invention is applied will be described with reference to the drawings.

(constitution of card reader 1)

Fig. 1 is an explanatory diagram schematically showing a configuration of a card reader 1 according to an embodiment of the present invention. The card reader 1 shown in fig. 1 is a device that carries a card 2 on which information such as magnetic information is recorded, and reads the magnetic information recorded on the card 2 and writes the magnetic information on the card 2. The card reader 1 can be used for example in ATMs, convenience stores, gas stations etc. The information processed by the card reader 1 includes information recorded or to be recorded on an IC chip, and the like.

The card reader 1 includes: a door part 10 with an input opening 11, and a device main body 20 with a sensor 21 for reading the information of the card 2. In the present embodiment, since the card 2 records magnetic information, the sensor 21 is a magnetic sensor. A conveyance path 22 communicating with the inlet 11 is formed inside the apparatus main body 20, and the sensor 21 is disposed facing the conveyance path 22. The door 10 is formed with an insertion path 12 that communicates the inlet 11 with the conveyance path 22. The apparatus main body 20 includes a conveying mechanism 30 for conveying the card 2 along the conveying path 22. The door 10 includes a detection unit 13 and a pre-head 14 near the input port 11. The detection unit 13 is an insertion detection mechanism that detects that the card 2 has been inserted near the insertion port 11. As the detection unit 13, a contact sensor or an optical sensor including a detection member that comes into contact with the inserted card 2 may be used. The pre-reader 14 includes a magnetic sensor for detecting that magnetic information is recorded in the inserted card 2.

The conveyance mechanism 30 includes: a conveyance roller 31 that comes into contact with the card 2 and conveys the card 2, a pressing roller 39 that presses the card 2 against the conveyance roller 31, a motor 38 as a driving source, and a driving force transmission mechanism 34 that transmits the rotation of the motor 38 to the conveyance roller 31. The conveying rollers 31 are arranged at predetermined intervals in the front-rear direction along the conveying path 22. The plurality of conveyance rollers 31 face the pressing roller 39 across the conveyance path 22. The driving force transmission mechanism 34 includes: a first belt mechanism 35, the first belt mechanism 35 being formed by a belt stretched over a pulley attached to a rotation shaft of the conveyance roller 31; and a second belt mechanism 36, the second belt mechanism 36 being formed by one of pulleys that transmits rotation of the motor 38 to the first belt mechanism 35. The driving force transmission mechanism 34 is not limited to such a configuration, and can be modified as appropriate.

(constitution of the carrying roller 31)

Fig. 2 is an explanatory diagram showing a specific example of the conveyance roller 31 shown in fig. 1. The conveyance roller 31 shown in fig. 2 includes: a substantially cylindrical rubber member 32 on the outer peripheral side, the rubber member 32 constituting a roller surface 310 which contacts the card 2; and a support member 33. The support member 33 supports the rubber member 32 by coming into contact with the inner peripheral surface of the rubber member 32. A plurality of protrusions 32a protruding radially inward are formed on the inner circumferential surface of the rubber member 32. A plurality of recessed portions 33a recessed radially inward are formed on the outer peripheral surface of the support member 33, and the plurality of protrusions 32a of the rubber member 32 are engaged with the plurality of recessed portions 33a of the support member 33, respectively. Although not shown, the conveying roller 31 may be configured such that the rubber member 32 is fixed to the support member 33 with an adhesive.

(Material of rubber Member 21)

The material of the rubber member 32 shown in fig. 2 will be described. In the following description, the "urethane rubber" is referred to as "UR", the "hydrogenated nitrile rubber" is referred to as "H-NBR", and the ethylene propylene diene terpolymer rubber is referred to as "EPDM".

Fig. 3 is an explanatory diagram showing the relationship between the material of the rubber member 32 shown in fig. 2 and the results of various tests. Fig. 4 is an explanatory view showing a relationship between the material of the rubber member 32 shown in fig. 2 and the outer diameter value of the rubber member 32 after being immersed in various solvents, and shows the degree of swelling of the solvents. The initial value of the rubber component was 20 mm. Fig. 5 is an explanatory diagram showing a relationship between the material of the rubber member 32 shown in fig. 2 and the clamping force. Fig. 6 is an explanatory diagram showing a relationship between the material of the rubber member 32 shown in fig. 2 and the rubber hardness at the time of temperature change. In FIGS. 3 to 6, the term "H-NBR 100%" in the case of a single component of hydrogenated nitrile rubber (H-NBR), and the term "EPDM 100%" in the case of a single component of ethylene propylene diene terpolymer rubber (EPDM) are used. In FIGS. 3 to 6, the blending ratio of the H-NBR to the EPDM in the blended rubber is shown by volume ratio as follows.

“H-NBR75％+EPDM25％”

H-NBR＝75％

EPDM＝25％

Blending ratio of H-NBR to EPDM is 3:1

“H-NBR50％+EPDM50％”

H-NBR＝50％

EPDM＝50％

Blending ratio of H-NBR to EPDM 1:1

“H-NBR25％+EPDM75％”

H-NBR＝25％

EPDM＝75％

Blending ratio of H-NBR to EPDM 1:3

In fig. 3, the contents of each test are as follows.

Hydrolysis test in a crucible of citric acid aqueous solution (pH4) and a crucible of adipic acid aqueous solution (pH4) at 80 ℃ for 7 weeks or more

Alcohol immersion test-immersion in ethanol (100%) for 14 days

Hydrocarbon solvent immersion test 14 days of immersion in a hydrocarbon solvent

Chlorine detergent immersion test in hypochlorous acid + sodium hydroxide aqueous solution (pH12)

Gasoline immersion test immersion in gasoline + kerosene (1:1) for 14 days

Mineral oil immersion test-immersion in Engine oil for 14 days

Vegetable oil immersion test in rapeseed oil for 14 days

Ultraviolet ray, outdoor environment test & placed outdoors

Cold resistance test placed in cold storage

In fig. 3, a rubber member having a small change in rubber hardness and outer diameter and good in the change is indicated by a double circle, a next rubber member is indicated by a single circle, a next rubber member is indicated by a triangle, and a rubber member having a large change is indicated by x. The condition for marking triangles is inferior to the condition for marking double circles or single circles, but still at the level of achieving the target level. The condition of mark x is a level that does not reach the target level.

As can be seen from fig. 3, all the rubbers were good results in the vegetable oil immersion test and the cold resistance test.

The results of the hydrolysis test and the alcohol immersion test were better for the H-NBR-only component, the EPDM-only component, and the blended rubber of the H-NBR and the EPDM than for the UR-only component. Especially in hydrolysis tests the UR single component is at a level that does not reach the level set for the card reader 1.

In the alcohol immersion test, as shown in FIG. 4, the blended rubber of H-NBR and EPDM tends to have a smaller change amount (swelling amount) in the outer diameter as the blending ratio of EPDM is higher. In the hydrocarbon solvent impregnation test and the gasoline impregnation test, the H-NBR single component is more preferable than the UR single component. The blended rubber of H-NBR and EPDM has the same or better result with UR single component, and the target level is reached. In the chlorine-based detergent immersion test and the mineral oil immersion test, the UR-only component and the H-NBR-only component are the same. The blended rubber of H-NBR and EPDM was inferior to the results of UR alone and H-NBR alone, but reached the target level.

Further, as shown in FIG. 4, in the hydrocarbon solvent immersion test, the gasoline immersion test and the mineral oil immersion test, the amount of change in the outer diameter tends to be larger as the blending ratio of EPDM to H-NBR is higher.

In the ultraviolet ray and outdoor environment tests, the single component of H-NBR was inferior to the results of the UR single component and the blended rubber of H-NBR and EPDM, but the aimed level was reached.

As shown in fig. 5, in the clamping force (carrying force) test, EPDM is preferably used as a single component in all cases of initial and after 50 ten thousand trial and error of magnetic card carrying. For the blended rubber of H-NBR and EPDM, the higher the blending ratio of EPDM, the higher the grip force. If more than 25% EPDM is blended, the same or even better performance as the UR single ingredient can be obtained.

Further, as shown in FIG. 6, in the evaluation results of the rubber hardness at the time of temperature change, the change in hardness of the EPDM single component was the smallest, and the higher the blending ratio of EPDM to H-NBR, the smaller the change in hardness. If more than 25% EPDM is blended, the same or even better performance as the UR single ingredient can be obtained.

In the present embodiment, the rubber member 32 forming the roller surface 310 of the conveyance roller 31 is made of a blended rubber including a first rubber material made of H-NBR and a second rubber material different from the H-NBR based on the above evaluation results and the like.

(main effect of the present embodiment)

The first rubber material (H-NBR) is a rubber material in which NBR is hydrogenated to reduce double bonds remaining in the main chain, and unlike UR (ester-based polyurethane), does not have an ester bond. Therefore, the H-NBR is less likely to undergo hydrolysis by an acid, and is excellent in hydrolysis resistance. Further, H-NBR is superior to NBR in heat resistance, weather resistance and chemical resistance, and superior to UR in gasoline resistance. Therefore, if the rubber material of the conveyance roller 31 is made of the H-NBR alone, there is a problem that although the characteristics better than the required level can be obtained, the cost increases. However, in this embodiment, since the rubber member 32 constituting the roller surface 310 is made of a blended rubber containing the H-NBR (first rubber material) and the second rubber material, it is possible to reduce the cost to an appropriate level while ensuring excellent characteristics as the conveyance roller 31. In addition, when the blended rubber is used, the rubber material is kneaded and vulcanized at the same time, and therefore, a large load is not likely to be generated in the production process.

Here, an embodiment in which the second rubber material is made of a rubber material having a polarity lower than that of the H-NBR can be adopted. That is, since the H-NBR is excellent in gasoline resistance and the like, a rubber material slightly inferior in gasoline resistance and the like may be used as the second rubber material. The index of "polarity" referred to herein includes an SP value, and an embodiment in which the second rubber material is made of a rubber material having an SP value smaller than that of the H-NBR can be adopted.

In the present embodiment, the second rubber material is EPDM. The SP value of the H-NBR is 17.6-21.5 MP^1/2The SP value of EPDM is 16.5-17.5 MP^1/2. EPDM is a rubber material used in a wide range of fields, and is low in cost. For example, the price of H-NBR is about 1.5 times the price of UR, whereas the price of EPDM is about 0.5 times the price of UR. Therefore, EPDM is effective for reducing the cost of the transfer roll 31, and is suitable for use in a blended rubber with H-NBR. Although the H-NBR is superior to unhydrogenated NBR in heat resistance, oil resistance, mechanical strength, and the like, it has an advantage that the change in hardness in a low-temperature environment can be reduced by blending the H-NBR with EPDM. Further, when the H-NBR is blended with EPDM, the grip force (conveying force) can be improved as compared with the H-NBR having a single component.

(method of manufacturing card reader 1)

In the rubber member 32 of the conveying roller 31 of the present embodiment, the blending ratio of the first rubber material (H-NBR) to the second rubber material (EPDM) is, for example, 1:3 to 3:1 in terms of volume ratio. Here, the higher the blending ratio of the H-NBR, the more excellent the solvent resistance to hydrocarbon solvents, gasoline and mineral oil, and the higher the blending ratio of the EPDM, the more excellent the grip force (conveying force). Thus, in this embodiment, when manufacturing the card reader 1 shown in FIG. 1, the blend ratio of the first rubber material (H-NBR) to the second rubber material (EPDM) in the rubber member 32 is determined according to the environment in which the card reader 1 is used.

For example, in manufacturing the card reader 1 for a gas station, since gasoline or the like is easily attached to the rubber member 32 of the carrying roller 31 via the card 2, the blending ratio of the H-NBR is set high. For example, the blending ratio of H-NBR to EPDM is set to 3: 1. The rubber hardness of the rubber member 32 can be adjusted, for example, within a range of about 65 ° to 85 °.

In contrast, when manufacturing the card reader 1 used in an environment in which the card reader is continuously used, the compounding ratio of the EPDM in the rubber member 32 of the conveying roller 31 is set high in consideration of the high conveying force. For example, the blending ratio of H-NBR to EPDM is set to 1: 3. The rubber hardness of the rubber member 32 can be adjusted, for example, within a range of about 65 ° to 85 °.

On the other hand, in an intermediate environment between the above two cases, the blending ratio of H-NBR to EPDM was set to 1: 1. The rubber hardness of the rubber member 32 can be adjusted, for example, within a range of about 65 ° to 85 °.

(other embodiments)

The above embodiment is an example of a preferred embodiment of the present invention, but is not limited to this, and modifications can be made within a scope not changing the gist of the present invention. For example, although EPDM is used as the second rubber material in the above embodiment, butyl rubber (IIR), vinylidene fluoride rubber (FKM), Chloroprene Rubber (CR), ether urethane rubber, or the like may be used as the second rubber material. Butyl rubber and chloroprene rubber exhibit a slightly smaller SP value than EPDM. In the above embodiment, two rubber materials are blended, but three or more rubber materials may be blended.

Claims

1. A transport roller for transporting a card by rotating under a driving force from a driving source,

a rubber member having a roller surface constituting a contact with the card,

the rubber member is composed of a blended rubber including at least a first rubber material composed of hydrogenated nitrile rubber and a second rubber material different from the hydrogenated nitrile rubber.

2. The carrier roller as claimed in claim 1,

the second rubber material is composed of a rubber material having a polarity lower than that of the hydrogenated nitrile rubber.

3. The carrier roller as claimed in claim 2,

the second rubber material is ethylene propylene diene terpolymer rubber.

4. The carrier roller as claimed in claim 3,

the blending ratio of the first rubber material to the second rubber material is 1: 3-3: 1 in terms of volume ratio.

5. The carrier roller as claimed in claim 4,

the blending ratio of the first rubber material to the second rubber material is 1: 1-3: 1 in terms of volume ratio.

6. A card reader provided with the carrying roller according to any one of claims 1 to 5, comprising:

an input port into which the card is input;

a sensor that reads information recorded on the card; and

and a transport mechanism that transports the card, which is inserted from the insertion opening, to a sensing position of the sensor by the transport roller.

7. A method of manufacturing a card reader, wherein the card reader is the card reader of claim 6,

determining a blend ratio of the first rubber material to the second rubber material in the rubber component according to a use environment of the card reader.