JP2003192170A - Endless belt for carrying paper sheets - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an endless belt for carrying paper sheets capable of consistently carrying paper sheets from high temperature to low temperature by stabilizing the grip force on the belt surface at a high level. <P>SOLUTION: The endless belt 10 for carrying paper sheets is formed of millable polyurethane, and comprises a rubber layer having teeth 13 engaged with a toothed pulley on the side opposite to the belt surface in contact with the paper sheets. The rubber layer has a yarn-like core 12 formed of polyester yarn inside, and the change per 1°C in a rubber-like region of the modulus of dynamic elasticity is ≤10 MPa, and the difference between the maximum value and the minimum value of tan δ measured at -20°C to +40°C at 1 Hz is ≤0.15. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic ticket gate, a cash dispenser, a money changer, etc., in which paper sheets such as banknotes, films, magnetic cards and tickets are sandwiched between belts facing each other. The present invention relates to an endless belt for transporting paper sheets, which is used as a transport belt for transporting in multiple directions by a sandwiching force.

[0002]

2. Description of the Related Art Conventionally, in automatic ticket gates, cash dispensers, money changers, etc., banknotes, films, magnetic cards, tickets, etc. are sandwiched between belts arranged facing each other. Transported by force. That is, for example,
As shown in FIG. 8, the paper sheet conveying belts 01 and 02
Is a pair of pulleys 03a, 03b and 04, respectively.
The paper sheets 05 are stretched between a and 04b and are arranged to face each other. The paper sheet 05 is a pair of rotationally driven paper sheet conveyance belts 01.
It is conveyed by the pinching force between the and 02.

As a belt of this type, since a bill, a magnetic card, a ticket, etc. are smoothly transferred in the apparatus, the surface is smooth and has no adhesive property, has a sufficient elastic force, and is outside the apparatus. It has a sufficient tearing force so that it will not come into contact with the part of the pulley and will not be torn. Also, it has a large elongation and a small initial tension so that the allowable range of the shaft distance between pulleys can be made large, and it has sufficient durability. It is necessary to have performance. And for this kind of belt,
A rubber elastic body such as nitrile rubber (NBR), chloroprene (CR), cast polyurethane, etc., provided with a core body made of a tubular body woven of nylon false twisted yarn, etc. A belt with a smooth surface is known. There is.

Further, a woven or knitted fabric is used for the belt core, and a coating layer is formed on the front and back of the core so that the side of the coating layer serving as the transport surface maintains fine irregularities due to the fibers of the core. A thin belt is known (for example, Japanese Patent Publication No. 59-24684 and Japanese Patent Publication No. 63-242848).

[0005]

However, recently,
Due to the complicated and high-speed transportation route accompanying the downsizing of the device, especially at low temperature, the friction coefficient extremely decreases and the grip force (pulling force) decreases, causing a problem in the transportation of paper sheets. There is a problem.

In view of such circumstances, the present invention has been made in view of the above circumstances.
An object of the present invention is to provide an endless belt for conveying paper sheets, which stabilizes the grip force on the belt surface at a high level and can stably convey paper sheets from high temperature to low temperature.

[0007]

A first aspect of the present invention for achieving the above object is an endless belt for conveying paper sheets, which is made of millable polyurethane and is in contact with the paper sheets. It is composed of a rubber layer having teeth that mesh with a toothed pulley on the side opposite to the belt surface, and the rubber layer has a thread-like core made of polyester yarn inside and has a dynamic elastic modulus of 1 ° C. in a rubber-like region. 10 changes per hit
An endless belt for conveying paper sheets, wherein the difference between the maximum value and the minimum value of tan δ measured at −20 ° C. to + 40 ° C. at 1 Hz is 0.15 or less.

A second aspect of the present invention is the endless belt for conveying paper sheets according to the first aspect, characterized in that the polyester yarn has a thickness of # 30.

A third aspect of the present invention is the endless belt for conveying paper sheets according to the first or second aspect, characterized in that the millable polyurethane is poly-ε-caprolactone type polyurethane.

A fourth aspect of the present invention is the core body according to any one of the first to third aspects, wherein the rubber layer is made of a stretchable woven fabric or knitted fabric on the side opposite to the belt surface of the filamentous core body. An endless belt for transporting paper sheets, comprising:

The endless belt for conveying paper-like materials according to the present invention is made of millable polyurethane and has a polyurethane thread as a thread-like core, and has a dynamic elastic modulus change and t.
Since the temperature dependence of an δ is within the predetermined range, the decrease in the friction coefficient at low temperatures is reduced, and the predetermined transportability is maintained even at low temperatures.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in more detail below.

FIG. 1 shows a schematic structure of an endless belt for conveying paper sheets according to an embodiment of the present invention. As shown in Figure 1,
The endless belt 10 for conveying sheets according to the present invention is a belt main body 1
1 has a filamentous core 12 made of polyester yarn,
On the side opposite to the paper sheet conveying surface, teeth 13 that mesh with the toothed pulley are formed at equal intervals in the circumferential direction. A core body 14 made of a stretchable woven or knitted fabric is provided on the pulley surface on which the teeth 13 are formed.

The endless belt 10 for conveying paper sheets according to the present invention is
In order to obtain a proper initial tension and a sufficient durability, the belt main body 11 has the filamentous core body 12 therein.

In the present invention, the belt body 11 is preferably made of millable polyurethane, particularly polyurethane obtained by reacting poly-ε-caprolactone diol with diisocyanate. Further, the belt body 11 preferably has a rubber hardness of 30 ° to 90 ° on the Shore A scale, for example.

Here, as the poly-ε-caprolactone, particularly, the average value of the caprolactone chain is adjusted to a predetermined number and the molecular weight distribution Mw / Mn is 1.0 to 1.5. Further, diisocyanates include, for example, 2,6-toluene diisocyanate (TDI), 4,4′-diphenylmethane diisocyanate (MDI), paraphenylene diisocyanate (PPDI), 1,5-naphthalene diisocyanate (NDI) and 3,3-dimethyl. It is at least one selected from diphenyl-4,4'-diisocyanate (TODI).

On the other hand, the filamentous core 12 has appropriate tensile strength and elasticity, and the dynamic elastic modulus of the belt body 11 in which the filamentous core 12 is embedded and the rate of change in tan δ with respect to temperature change. A polyester yarn, particularly a polyester yarn having a thickness of about 30 is preferable because it is within a predetermined range. If it is thinner than this range, the mechanical strength is insufficient and it extends more than necessary, and if it is thicker than this range, the flexibility especially at low temperature is deteriorated, which is not preferable. In addition, when a high strength yarn such as Kevlar (trade name) is used, there is a problem that tan δ at a low temperature is large and tan δ has a large temperature dependency.

The core 14 is preferably a tubular body made of a woven fabric, a knitted fabric or the like. The woven fabric is made of polyester fiber or the like and has a widthwise stretchability of 1/5 with respect to the belt lengthwise stretchability. The following stretchable fabrics are preferred. That is, it is preferable that the core body 14 has some elasticity and is provided along the surfaces of the teeth 13. This is because the core body 14 is provided on the surface in sliding contact with the toothed pulley to reduce wear.

Since the endless belt 10 for conveying paper sheets according to the present embodiment has the thread-shaped core body 12 made of polyester thread in a predetermined rubber material, the dynamic elastic modulus and tan δ.
The temperature dependence of is small, and a stable grip force can be obtained from low temperature to high temperature.

Here, the dynamic elastic modulus and tan δ can be obtained by measuring the dynamic viscoelasticity. That is, by measuring the dynamic viscoelasticity, the dynamic elastic modulus E ′ and the dynamic loss E ″ are obtained.
And tan from the relationship between the dynamic loss E ″ and the complex elastic modulus E ^*
δ can be determined as follows.

[0021]

[Equation 1] E ^* = E ′ + iE ″ E ′ = E ^* cosδ E ″ = E ^* sinδ tanδ = E ″ / E ′

[Examples] Specific examples will be described below, but it goes without saying that the present invention is not limited thereto.

(Example) First, ethylene glycol 62
By appropriately reacting 1 part by weight with 1140 parts by weight of ε-caprolactone in the presence of a catalyst (SnCl ₂ ) of 30 ppm, the caprolactone chain is 5 and the molecular weight Mn is 12
00 of poly-ε-caprolactone type diol was obtained. 20 parts by weight of MDI (4,4′-diphenylmethane diisocyanate) was added to 100 parts by weight of this poly-ε-caprolactone-based diol and reacted at 100 ° C. for 3 hours to obtain a millable urethane. Subsequently, 100 parts by weight of this millable urethane was added to the peroxide crosslinking agent Perkmill D-40.
5 parts by weight (trade name; manufactured by NOF CORPORATION), 20 parts by weight of carbon black, 2 parts by weight of antioxidant, and 10 parts by weight of process oil were mixed and kneaded by an open roll.

Then, a stretchable woven fabric made of polyester is used in the mold in which the grooves corresponding to the teeth 13 are formed (stretchability in the transverse direction: stretchability in the longitudinal direction = about 1:10) as weft yarns. The core is covered so as to be orthogonal to the axial direction of the core, and a filament core made of No. 30 polyester yarn is 0.8 mm on the cover.
It was wound in a spiral shape at a pitch of. Then, the polyurethane used in the belt main body was applied as a co-paste with a rubber paste obtained by diluting and dissolving the polyurethane in a solvent (for example, toluene) about 15 times, dried, and then the above-mentioned millable polyurethane was extruded and molded on this. Rubber tube 2 to 2.5
It was covered with a thickness of mm.

Then, a film was wound from above and put in a vulcanizing can for steam vulcanization to obtain a tube material for an endless belt. At this time, a Lumirror film (polyester film: trade name) was used as the film, and was wound and vulcanized so that a pressure of about 10 kg was applied. This allows
The core body 14 and the rubber layer made of a stretchable woven fabric are pressed into the groove of the cored bar with a groove and molded to form the tooth 13.
At this time, the core body 14 made of a stretchable woven fabric was arranged on the pulley contact surface provided with the teeth 13, and the surface was covered with a thin rubber layer.

The material was surface-polished with a grinder and cut into pieces with a predetermined width to obtain an endless belt having a rubber hardness of about 80 °. The belt width is about 25 mm, and the surface roughness of the polished surface is R
z = 20 ± 20.

The manufacturing method is not limited to this, and the rubber tube body may be formed by press molding or the like. Also,
The polishing step may be performed as necessary, and the surface may be grained or have a pattern.

Comparative Example 1 An endless belt for conveying paper sheets was obtained in the same manner as in Example 1 except that the rubber material was chloroprene.

Comparative Example 2 An endless belt for conveying paper sheets was obtained in the same manner as in Example 1 except that the rubber material was NBR.

(Comparative Example 3) An endless belt for conveying paper sheets was obtained in the same manner as in Example 1 except that the number 20 polyester thread was used as the filamentous core.

(Comparative Example 4) An endless belt for conveying paper sheets was obtained in the same manner as in Example 1 except that the number 50 polyester thread was used as the filamentous core.

(Comparative Example 5) An endless belt for conveying paper sheets was obtained in the same manner as in Example 1 except that the filamentous core was made of No. 130 polyester thread.

(Comparative Example 6) An endless belt for conveying paper sheets was obtained in the same manner as in Example 1 except that the filamentous core was 400 denier Kevlar (trade name).

Test Example 1 With respect to each of the belts of Examples and Comparative Examples 1 and 2, the pull-out force was measured every 10 ° C. from −10 ° C. to 50 ° C. and the result is shown in FIG.

The grip force is measured between the belts by P
It was carried out by sandwiching a 50g PC high quality paper and measuring the pulling force by a spring measure.

From the results shown in FIG. 2, the belt of the example is -1.
The grip force was stable in the temperature range of 0 ° C to 50 ° C.

Test Example 2 With respect to the rubber belts of Examples and Comparative Examples 3 to 6, using a viscoelasticity measuring instrument, the dynamic modulus of elasticity (P) was raised from -40 ° C to 2O ° C / min up to 40 ° C.
a) and tan δ (loss tangent) are measured and the results are shown in FIG.
It shows in FIG.

From these results, the rate of change (MPa / ° C.) per 1 ° C. of the dynamic elastic modulus of the rubber-like region and the tan δ of −
Table 1 shows the difference between the maximum value and the minimum value in the range of 20 ° C to + 40 ° C. From the results shown in FIGS. 3 to 7 and Table 1, in the belts of Examples, the change rate of the dynamic elastic modulus was 10 or less, and t
It was found that the maximum-minimum difference in an δ was 0.15 or less, and the temperature dependence of the dynamic elastic modulus and tan δ was extremely small. On the other hand, Comparative Example 3 using a relatively thin polyester yarn has a small temperature dependence of tan δ, but has a large change in dynamic elastic modulus, and Comparative Examples 4 and 5 using a relatively thick polyester yarn It was found that the temperature dependence of the dynamic elastic modulus is small, but the temperature dependence of tan δ is large, and a stable grip force cannot be obtained at low temperatures. It was also found that Comparative Example 6 using Kevlar (trade name) has a large temperature dependency of the dynamic elastic modulus and cannot obtain a stable grip force at a low temperature.

[0039]

[Table 1]

[0040]

As described above, the rubber layer is made of millable polyurethane and has the teeth that engage with the toothed pulley on the side opposite to the surface of the belt that comes into contact with the paper sheets. The rubber layer has polyester inside. A filamentous core made of a yarn is provided, and a change in dynamic elastic modulus in a rubber-like region per 1 ° C. is 10 MPa or less and −20 ° C. at 1 Hz.
Since the difference between the maximum value and the minimum value of tan δ measured at up to + 40 ° C is 0.15 or less, the grip force on the belt surface should be stabilized at a high level and the sheet should be stably conveyed from high temperature to low temperature. There is an effect that can be.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of an endless belt for conveying paper sheets according to an embodiment of the present invention.

FIG. 2 is a diagram showing the results of Test Example 1 of the present invention.

FIG. 3 is a diagram showing the results of Test Example 2 of the present invention.

FIG. 4 is a diagram showing the results of Test Example 2 of the present invention.

FIG. 5 is a diagram showing the results of Test Example 2 of the present invention.

FIG. 6 is a diagram showing the results of Test Example 2 of the present invention.

FIG. 7 is a diagram showing the results of Test Example 2 of the present invention.

FIG. 8 is a schematic view conceptually showing an example of a usage state of the endless belt for conveying paper sheets.

[Explanation of symbols]

10 Endless belt for conveying paper sheets 11 Belt body 12 Filiform core 13 teeth 14 core

Claims (4)

[Claims] 1. An endless belt for conveying paper sheets, comprising: a rubber layer made of millable polyurethane and having teeth meshing with a toothed pulley on the side opposite to the belt surface in contact with the paper sheets. The rubber layer has a filamentous core made of polyester yarn inside, and the change in dynamic elastic modulus in the rubber-like region per 1 ° C. is 10 MP.
An endless belt for conveying paper sheets, wherein the difference between the maximum value and the minimum value of tan δ measured at −20 ° C. to + 40 ° C. at 1 Hz is 0.15 or less. 2. The endless belt for conveying paper sheets according to claim 1, wherein the polyester yarn has a thickness of # 30. 3. The endless belt for transporting paper sheets according to claim 1, wherein the millable polyurethane is poly-ε-caprolactone-based polyurethane. 4. The rubber layer according to any one of claims 1 to 3, wherein the rubber layer comprises a core body made of a stretchable woven fabric or a knitted fabric on the side of the filamentous core body opposite to the belt surface. Endless belt for conveying paper sheets.