JP2016117545A - Detection roller, and device for detecting sheet thickness - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a detection roller in which impact resilience is low and vibration is hardly generated when shifting according to the sheet thickness, and to provide a device for detecting sheet thickness equipped with the same.SOLUTION: In the device for detecting the thickness of a conveyed sheet, the detection roller is arranged in a state of being abutted on a reference roller held movably, and is held so as to move and shift according to the thickness of the sheet conveyed between the reference roller and the same. The detection roller includes an inner ring formed of a rubber composition and an outer ring which covers an outer periphery of the inner ring and is formed of a material having a stiffness larger than that of the inner ring, and the rubber composition includes: a rubber component containing a dimethyl silicon rubber and a phenyl group-containing silicon rubber; and a phenyl group-containing silicon oil.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a detection roller and a paper sheet thickness detection device used in a paper sheet thickness detection device that detects the thickness of paper sheets such as banknotes.

  In an automatic teller machine (ATM) or an automatic teller machine (CD), the thickness of a paper sheet is detected for determining the number of banknotes to be deposited or banknotes to be paid and for determining the banknote denomination and authenticity. A paper sheet thickness detection device is provided.

  In the paper sheet thickness detection device, the reference roller and the detection roller are arranged so as to face each other, and when the paper sheet is conveyed between them, the detection roller is displaced according to the thickness of the paper sheet. From the amount of displacement, the thickness of the paper sheet is detected (see, for example, Patent Document 1).

  The detection roller includes, for example, an inner ring made of an elastic material such as rubber, and an outer ring made of a material such as a metal that covers the outer periphery of the inner ring and has higher rigidity than the inner ring. The detection roller is arranged in a state of being pressed against the reference roller by an elastic inner ring. When the paper sheet is conveyed between the detection roller and the reference roller, the inner ring elastically deforms due to the thickness of the paper sheet. It can be displaced by the thickness of the paper sheet.

  From the viewpoint of imparting desired elasticity to the inner ring, for example, silicone rubber or the like is used as an elastic material for the inner ring.

JP 2006-226859 A

  However, since the inner ring made of silicone rubber has high rebound resilience, the detection roller provided with such an inner ring jumps up rapidly when paper sheets are conveyed to and from the reference roller, and vibrates due to the reaction. Sometimes. In this case, the displacement amount of the outer ring of the detection roller cannot be accurately detected, and it is difficult to accurately grasp the number of paper sheets.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a detection roller that has low impact resilience and is less likely to vibrate when displaced according to the thickness of a paper sheet, and a paper sheet thickness detection apparatus including the same.

According to one aspect of the invention,
In a sheet thickness detecting device for detecting the thickness of a conveyed sheet, the sheet thickness detecting device is disposed in contact with a reference roller that is rotatably supported, and is rotatably conveyed between the reference roller. A detection roller supported to be displaceable according to the thickness of the paper sheet
An inner ring formed from a rubber composition, and an outer ring that covers an outer periphery of the inner ring and is formed from a material having higher rigidity than the inner ring,
A detection roller is provided in which the rubber composition contains a rubber component including dimethyl silicone rubber and phenyl group-containing silicone rubber, and a phenyl group-containing silicone oil.

According to another aspect of the invention,
A reference roller rotatably supported;
A detection roller that is disposed in contact with the reference roller, is rotatably supported, and is displaceably supported according to the thickness of a sheet conveyed between the reference roller and
A sheet thickness detecting device for detecting the thickness of the conveyed paper sheet, comprising a displacement sensor for detecting a displacement amount displaced according to the thickness of the paper sheet of the detection roller,
The detection roller includes an inner ring formed of a rubber composition, and an outer ring that covers an outer periphery of the inner ring and is formed of a material that is higher in rigidity than the inner ring,
There is provided a paper sheet thickness detecting device, wherein the rubber composition contains a rubber component containing dimethyl silicone rubber and phenyl group-containing silicone rubber, and a phenyl group-containing silicone oil.

  According to the present invention, it is possible to obtain a detection roller that has low rebound resilience and hardly generates vibration when displaced according to the thickness of the paper sheet, and a paper sheet thickness detection apparatus including the detection roller.

1 is a schematic configuration diagram of a paper sheet thickness detection device according to an embodiment of the present invention. It is sectional drawing of the detection roller which concerns on one Embodiment of this invention. It is a figure which shows the case where a detection roller is displaced according to the thickness of paper sheets.

<1. Outline of sheet thickness detector>
Hereinafter, the detection roller and the paper sheet thickness detection device will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of a paper sheet thickness detection apparatus according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of a detection roller according to an embodiment of the present invention. FIG. 3 is a diagram illustrating when the detection roller is displaced according to the thickness of the paper sheet.

  The paper sheet thickness detection device 1 (hereinafter also simply referred to as the detection device 1) is arranged so as to be in contact with the reference roller 10 rotatably supported by the reference roller 10, and to be rotatable between the reference roller 10 and the reference roller 10. A detection roller 20 supported so as to be displaceable according to the thickness of the paper sheet conveyed in between, and a displacement sensor 30 that detects a displacement amount that varies according to the thickness of the paper sheet of the detection roller 20 are provided. .

  The reference roller 10 is rotatably supported by a first shaft 11 fixed to the detection device 1. A drive source (not shown) is connected to the first shaft 11, and the reference roller 10 rotates when the first shaft 11 is driven to rotate. The reference roller 10 is made of, for example, metal so that the outer peripheral surface thereof is not displaced, and serves as a reference surface when measuring the thickness of the paper sheet.

  The detection roller 20 is rotatably supported by a second shaft 21 that is substantially parallel to the first shaft 11, and as shown in FIG. 2, an inner ring formed of a rubber composition on the outer periphery of the second shaft 21. 22, and an outer ring 23 that covers the outer periphery of the inner ring 22 and is formed of a material (for example, metal) that is higher in rigidity than the inner ring 22. The detection roller 20 is arranged so as to be pressed against the reference roller 10 by an elastic inner ring 22 and in contact with the reference roller 10. The reference roller 10 that is in contact with the drive source is rotated by the drive source, whereby the detection roller 20 is driven to rotate.

  As shown in FIG. 3, when the paper sheet 40 is conveyed between the reference roller 10 and the detection roller 20, the detection roller 20 is elastically deformed by the thickness of the paper sheet 40 so that the inner ring 22 is elastically deformed. Depending on the thickness of the leaf 40, it can be displaced upward (in the direction from the reference roller 10 toward the detection roller 20) by the thickness of the paper leaf 40. As described above, when the detection roller 20 suddenly jumps up by the paper sheet 40, the detection roller 20 may vibrate due to the reaction, but in this embodiment, the inner ring 22 of the detection roller 20 has a rubber composition described later. The vibration of the detection roller 20 is suppressed because it is formed from an object and is configured to have low rebound resilience.

  The displacement sensor 30 is disposed above the detection roller 20 and detects the amount of displacement when the detection roller 20 is displaced according to the thickness of the paper sheet 40. Specifically, the displacement sensor 30 measures a displacement amount d when the detection roller 20 pressed by the reference roller 10 (indicated by a dotted line in FIG. 3) is displaced according to the thickness of the paper sheet 40. Then, the displacement amount d is detected as the thickness of the paper sheet 40. As the displacement sensor 30, an optical sensor, a magnetic sensor, an electric sensor, or the like can be used.

<2. Detection roller>
As shown in FIG. 2, the detection roller 20 is formed of an inner ring 22 formed of a rubber composition on the outer periphery of the second shaft 21, and an outer ring of the inner ring 22, and is made of a material having higher rigidity than the inner ring 22. And an outer ring 23 to be provided.

  In the present embodiment, from the viewpoint of suppressing the vibration of the detection roller 20, the inner ring 22 is configured to have low rebound resilience, so that the rubber composition forming the inner ring 22 contains silicone oil. Silicone oil is a plasticizer and has an action of suppressing the resilience of the rubber composition to a low level. However, generally, even if silicone oil is contained in the rubber composition, the silicone oil is bleed from the rubber composition due to low compatibility between the rubber component contained in the rubber composition and the silicone oil. May end up. As a result, in the inner ring 22 formed from the rubber composition, the effect of silicone oil cannot be obtained, and the resilience elasticity becomes high. Therefore, in this embodiment, in order to suppress deterioration of characteristics due to bleed, a rubber component containing dimethyl silicone rubber and a phenyl group-containing silicone rubber, and a phenyl group-containing silicone oil excellent in compatibility with the rubber component, Use. Hereinafter, each component will be described.

  Dimethyl silicone rubber is a polysiloxane whose main chain is composed of siloxane bonds (—Si—O—) and whose side chains are all methyl groups. Dimethyl silicone rubber has high impact resilience, is softer and has a lower hardness than phenyl group-containing silicone rubber.

  The phenyl group-containing silicone rubber is a polysiloxane in which a part of the side chain of the dimethyl silicone rubber is substituted with a phenyl group. The phenyl group-containing silicone rubber has low impact resilience, is harder and higher in hardness than dimethyl silicone rubber.

  The rubber component containing these two types of silicone rubber is configured to have low impact resilience and high compatibility with the phenyl group-containing silicone oil. Further, the rubber component is configured so that the hardness falls within a desired range by containing silicone rubbers having different hardnesses. That is, according to this rubber component, the rebound resilience of the inner ring 22 can be reduced, the vibration of the detection roller 20 can be suppressed, and the amount of displacement of the detection roller 20 by a predetermined pressure is set to an appropriate range with the inner ring 22 having an appropriate hardness. it can.

  In the rubber component, the blending ratio of the dimethyl silicone rubber and the phenyl group-containing silicone rubber is not particularly limited, but when the total of these is 100 parts by mass, the content of the phenyl group-containing silicone rubber is 30 parts by mass or more and 50 parts by mass. Part or less. By setting it as such content, while suppressing the vibration of the detection roller 20, the inner ring | wheel 22 can be made into moderate hardness, and the displacement amount by the predetermined pressure of the detection roller 20 can be set to an appropriate range.

  The phenyl group-containing silicone oil is a liquid component at 25 ° C. in which part of the side chain is substituted with a phenyl group, and can reduce the resilience of the inner ring 22 and suppress vibration of the detection roller 20. Further, the hardness of the inner ring 22 can be reduced, and the amount of displacement of the detection roller 20 due to a predetermined pressure can be increased. Further, since the compression set of the inner ring 22 can be reduced, deformation of the inner ring 22 can be suppressed even when the reference roller 10 is pressed against the detection roller 20 and left for a long time. In addition to the phenyl group-containing silicone oil, the silicone oil includes dimethyl silicone oil and the like. However, these oils have low compatibility with the above-described rubber component, so that they are easy to bleed, and the resilience of the inner ring 22 is improved. Not only is it difficult to lower, but it is also difficult to suppress compression set.

  The viscosity of the phenyl group-containing silicone oil is preferably in the range of 20 to 10,000 mPa · s at 25 ° C. from the viewpoint of compatibility with the rubber component. By using the silicone oil having such a viscosity, the bleed can be suppressed and the rebound resilience of the inner ring 22 can be suppressed low. Further, since the silicone oil having a predetermined viscosity is small in stickiness and excellent in handleability, the inner ring 22 can be formed with high productivity by using a rubber composition containing such silicone oil.

  The content of the phenyl group-containing silicone oil is 2 parts by mass or more and 20 parts by mass or less with respect to 100 parts by mass of the rubber component. If the content is less than 2 parts by mass, the resilience of the inner ring 22 cannot be sufficiently reduced, and the vibration of the detection roller 20 may not be sufficiently suppressed. On the other hand, if the content exceeds 20 parts by mass, the impact resilience can be reduced, but the excess amount will bleed, and there is a risk of soiling paper sheets and the like.

  As described above, since the detection roller 20 of the present embodiment includes the inner ring 22 having low rebound resilience, when the paper sheet 40 is conveyed between the detection roller 20 and the reference roller 10, the detection roller 20 is less likely to vibrate. Or even if it vibrates, it is comprised so that a vibration attenuate | damps immediately. Specifically, for example, when the thickness of the inner ring 22 is 4 mm, the rebound resilience of the inner ring 22 can be suppressed to 45% or less. Therefore, according to the paper sheet thickness detection apparatus 1 including the detection roller 20 of the present embodiment, the thickness of the paper sheet 40 can be accurately detected, and the number of sheets can be accurately grasped.

  Moreover, since the inner ring 22 is formed from a rubber composition having low impact resilience, the resilience resilience can be maintained within a range of 45% or less even when the thickness is as thin as 2 mm. Therefore, the diameter of the detection roller 20 can be reduced by making the inner ring 22 thinner.

  Further, since the inner ring 22 is formed from a rubber composition containing two types of silicone rubbers having different hardnesses and a phenyl group-containing silicone oil, the inner ring 22 is adjusted to an appropriate hardness and is appropriately elastic by a predetermined pressure. It can be deformed. In addition, since the inner ring 22 is configured to reduce the compression set, the inner ring 22 is not easily deformed even when left for a long time while being pressed against the reference roller 10.

  The inner ring 22 can be formed, for example, by pouring a molten rubber composition into a mold and cooling.

In addition, the rubber composition forming the inner ring 22 may contain a vulcanizing agent and a crosslinking aid for crosslinking.
Examples of the vulcanizing agent include sulfur, sulfur compounds, inorganic vulcanizing agents other than sulfur, polyamines, resin vulcanizing agents, oximes, nitroso compounds, triazines, peroxides, and the like. These can be used alone or in combination of two or more.
The vulcanization aid is not particularly limited as long as it can be used in combination with the above vulcanization agent. For example, metal oxide, metal carbonate, amines, guanidine, aldehyde amine, aldehyde ammonia, thiazole, sulfenamide, thiourea, thiuram, dithiocarbamate, xanthate, allyl compounds, maleimides , Methacrylates, divinyl compounds and the like can be used. These can be used alone or in combination of two or more.

  In addition, the rubber composition may contain an inorganic filler. As the inorganic filler, dry or wet silica, carbon fine particles, or the like can be used. From the viewpoint of suppressing bleeding of silicone oil, it is preferable to use dry silica. According to the dry silica, silicone oil can be suitably adsorbed and bleeding can be suppressed.

  Moreover, you may make a rubber composition contain a plasticizer, an anti-aging agent (antioxidant), a stabilizer, etc. as another additive, for example.

  Next, the present invention will be described in more detail based on examples, but the present invention is not limited to these examples.

(1) Preparation of rubber composition (Example 1)
In Example 1, as shown in Table 1 below, 100 parts by mass of a rubber component obtained by mixing 30 parts by mass of phenyl group-containing silicone rubber and 70 parts by mass of dimethyl silicone rubber was added to a phenyl group-containing silicone oil (25 Viscosity at 20 ° C .; 20 mPa · s), 1.0 part by mass of benzoyl peroxide as a crosslinking agent, and 5 parts by mass of wet silica (BET specific surface area; 200 m ² / g) as a filler. The rubber composition of Example 1 was obtained by blending and mixing.

(Example 2)
In Example 2, a rubber composition was prepared in the same manner as in Example 1 except that the blending amount of the phenyl group-containing silicone oil was 10 parts by mass.

(Examples 3 to 6)
In Examples 3 to 6, rubber compositions were prepared in the same manner as in Example 1 except that the viscosity of the phenyl group-containing silicone oil was appropriately changed as shown in Table 1.

(Example 7)
In Example 7, a rubber composition was prepared in the same manner as in Example 1 except that the blending amounts of the phenyl group-containing silicone rubber and the dimethyl silicone rubber were changed to 50 parts by mass, respectively.

(Comparative Example 1)
In Comparative Example 1, a rubber composition was prepared in the same manner as in Example 1 except that 20 parts by mass of phenyl group-containing silicone rubber and 80 parts by mass of dimethyl silicone rubber were used without blending the phenyl group-containing silicone oil. .

(Comparative Examples 2 to 4)
In Comparative Examples 2-4, as shown in Table 1, rubber compositions were prepared in the same manner as in Example 1, except that the dimethyl silicone oil having a predetermined viscosity was used instead of the phenyl group-containing silicone oil.

(2) Preparation of detection roller The prepared rubber composition is supplied to an injection molding machine, heated and melted while kneading the rubber composition in the injection molding machine, and the molten rubber composition is poured into a mold. Cooled to solidify. Then, the cylindrical inner ring was obtained by removing the mold. In this example, an inner ring having a thickness of 4 mm was formed.
Subsequently, a stainless steel shaft as the second shaft 21 was press-fitted through the hole in the cylindrical inner ring, and a stainless steel tube as the outer ring was fitted, thereby producing a detection roller.

(3) Evaluation method The detection roller was evaluated by the following method.

(Rebound resilience)
For the impact resilience, a rubber specimen obtained above was used to prepare a test piece having a thickness of 4 mm simulating an inner ring, and a Rupke-type impact resilience apparatus was applied to the test specimen in accordance with JIS K6255. The test used was implemented and the resilience at that time was calculated | required. In this example, if the impact resilience was 45% or less, it was determined to be acceptable.

(Compression set)
The compression set was obtained by preparing a test piece simulating an inner ring using the rubber composition obtained above, and then subjecting this test piece to a test temperature of 70 ° C. and a test time of 24 hours in accordance with JIS K6262. The compression test was carried out so that the compression rate was 25%, and the compression set at that time was determined. In this example, if the compression set was 15% or less, it was accepted, and if it exceeded 15%, it was rejected.

(Hardness)
For the hardness, a test piece simulating an inner ring was produced using the rubber composition obtained above, and the hardness of the test piece was measured with a durometer. In this example, if the hardness was in the range of 15-30, it was determined to be acceptable. If the hardness is less than 15, the amount of displacement due to a predetermined pressure becomes excessively small, and if it exceeds 30, the amount of displacement becomes excessively large.

(Deflection)
The amount of deflection was determined by measuring the amount of displacement caused by elastic deformation of the inner ring when a member was pressed against the detection roller at a speed of 0.5 mm / min and a pressure of 200 to 500 gf. In this example, if the amount of deflection was in the range of 0.1 mm to 0.3 mm, it was judged as acceptable (◯), and if it was in the other range, it was judged as unacceptable (x).

(With or without bleeding)
The bleed was examined for oil components or the like eluting from the inner ring of the detection roller. If the oil components did not elute, it was judged as acceptable (◯), and if it was eluted, it was judged as rejected (×).

(Rotation test)
In the rotation test, the produced detection roller was incorporated into a paper sheet thickness detection device, and a simulated test paper having a thickness of 0.1 mm was conveyed at a speed of 1000 mm / s to evaluate whether the thickness could be accurately detected. If it could be detected accurately, it was judged as acceptable (O), and if the thickness could not be detected accurately due to vibration or it took a long time to detect, it was judged as unacceptable (x).

(4) Evaluation results As shown in Table 1, in Examples 1 to 7, the rebound resilience, compression set and hardness are acceptable, and the amount of deflection is within an appropriate numerical range. It was confirmed that the thickness of the paper sheet can be accurately detected when the test is performed. Moreover, no bleed of oil components from the inner ring was confirmed.

  On the other hand, in Comparative Example 1, since the phenyl group-containing silicone oil was not contained, the rebound resilience could not be sufficiently lowered, and was as high as 46%. Further, it was confirmed that the hardness was as low as 14 and the deflection amount was increased. Therefore, it was confirmed that the thickness of the paper sheet cannot be accurately detected in the rotation test.

  In Comparative Examples 2 to 4, although dimethyl silicone oil was used instead of the phenyl group-containing silicone oil, it was confirmed that the rebound resilience could not be sufficiently lowered and the thickness could not be detected accurately in the rotation test. It was. Furthermore, in Comparative Example 4, it was confirmed that not only the thickness could not be detected accurately, but also the paper sheets were soiled because bleeding occurred.

<Preferred embodiment of the present invention>
Hereinafter, preferred embodiments of the present invention will be additionally described.

[Appendix 1]
According to one aspect of the invention,
In a sheet thickness detecting device for detecting the thickness of a conveyed sheet, the sheet thickness detecting device is disposed in contact with a reference roller that is rotatably supported, and is rotatably conveyed between the reference roller. A detection roller supported to be displaceable according to the thickness of the paper sheet
An inner ring formed from a rubber composition, and an outer ring that covers an outer periphery of the inner ring and is formed from a material having higher rigidity than the inner ring,
A detection roller is provided in which the rubber composition contains a rubber component including dimethyl silicone rubber and phenyl group-containing silicone rubber, and a phenyl group-containing silicone oil.

[Appendix 2]
The detection roller according to appendix 1, preferably,
The viscosity of the phenyl group-containing silicone oil at 25 ° C. is 20 mPa · s or more and 10,000 mPa · s or less.

[Appendix 3]
The detection roller according to appendix 1 or 2, preferably,
The rubber composition contains 2 parts by weight or more and 20 parts by weight or less of the phenyl group-containing silicone oil with respect to 100 parts by weight of the rubber component.

[Appendix 4]
The detection roller according to any one of appendices 1 to 3, preferably,
The rubber composition contains 30 parts by mass or more and 50 parts by mass or less of the phenyl group-containing silicone rubber when the rubber component is 100 parts by mass.

[Appendix 5]
The detection roller according to any one of appendices 1 to 4, preferably,
The impact resilience is 45% or less.

[Appendix 6]
According to another aspect of the invention,
A reference roller rotatably supported;
A detection roller that is disposed in contact with the reference roller, is rotatably supported, and is displaceably supported according to the thickness of a sheet conveyed between the reference roller and
A sheet thickness detecting device for detecting the thickness of the conveyed paper sheet, comprising a displacement sensor for detecting a displacement amount displaced according to the thickness of the paper sheet of the detection roller,
The detection roller includes an inner ring formed of a rubber composition, and an outer ring that covers an outer periphery of the inner ring and is formed of a material that is higher in rigidity than the inner ring,
There is provided a paper sheet thickness detecting device, wherein the rubber composition contains a rubber component containing dimethyl silicone rubber and phenyl group-containing silicone rubber, and a phenyl group-containing silicone oil.

DESCRIPTION OF SYMBOLS 1 Paper sheet thickness detection apparatus 10 Reference | standard roller 11 1st shaft 20 Detection roller 21 2nd shaft 22 Inner ring 23 Outer ring 30 Displacement sensor

Claims (6)

In a sheet thickness detecting device for detecting the thickness of a conveyed sheet, the sheet thickness detecting device is disposed in contact with a reference roller that is rotatably supported, and is rotatably conveyed between the reference roller. A detection roller supported to be displaceable according to the thickness of the paper sheet
An inner ring formed from a rubber composition, and an outer ring that covers an outer periphery of the inner ring and is formed from a material having higher rigidity than the inner ring,
A detection roller in which the rubber composition contains a rubber component containing dimethyl silicone rubber and phenyl group-containing silicone rubber, and a phenyl group-containing silicone oil.   The detection roller according to claim 1, wherein the phenyl group-containing silicone oil has a viscosity at 25 ° C. of 20 mPa · s or more and 10,000 mPa · s or less.   The detection roller according to claim 1 or 2, wherein the rubber composition contains 2 parts by mass or more and 20 parts by mass or less of the phenyl group-containing silicone oil with respect to 100 parts by mass of the rubber component.   The detection roller according to any one of claims 1 to 3, wherein the rubber composition contains 30 parts by mass or more and 50 parts by mass or less of the phenyl group-containing silicone rubber when the rubber component is 100 parts by mass.   The detection roller according to claim 1, wherein the resilience is 45% or less. A reference roller rotatably supported;
A detection roller that is disposed in contact with the reference roller, is rotatably supported, and is displaceably supported according to the thickness of a sheet conveyed between the reference roller and
A sheet thickness detecting device for detecting the thickness of the conveyed paper sheet, comprising a displacement sensor for detecting a displacement amount displaced according to the thickness of the paper sheet of the detection roller,
The detection roller includes an inner ring formed of a rubber composition, and an outer ring that covers an outer periphery of the inner ring and is formed of a material that is higher in rigidity than the inner ring,
A paper sheet thickness detection apparatus, wherein the rubber composition contains a rubber component containing dimethyl silicone rubber and phenyl group-containing silicone rubber, and a phenyl group-containing silicone oil.

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