JPH07125866A - Paper sheet carrying belt - Google Patents

Abstract

PURPOSE:To secure the coefficient of friction between a paper sheet and the carrying surface of a belt to the extent that the carrying is not hindered, by partially exposing a canvas made of knit fabric or woven fabric, which is embedded in a shape holding rubber layer, on the carrying surface of a belt for carrying paper sheets, and arranging the fine line of the canvas of the exposed parts in the circumferential direction of the belt. CONSTITUTION:A paper sheet carrying belt 1 is provided with a shape holding rubber layer 2 forming a belt main body, and the shape and tension of the belt 1 is maintained by this shape holding rubber layer 2. A canvas 3 made of knit fabric or woven fabric is embedded in this shape holding layer 2. The canvas 3 is embedded so as to be deflected to the carrying surface 1a of the belt for carrying paper sheets (a), and the canvas 3 is partially exposed on the carrying surface 1a of the belt. Fine line of threads 3a of the canvas 3 of the exposed parts are arranged in the circumferential direction. Coefficient of friction between the paper sheet (a) and the carrying surface 1a of the belt can be thereby secured to the extent that the carrying is not hindered, and lowering and deterioration with age of the coefficient of friction between belts is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvements in a belt for conveying paper sheets, and more particularly to measures for stabilizing a friction coefficient.

[0002]

2. Description of the Related Art Generally, ATM (automated teller mac)
cash deposit machines such as hine) and CD (cash dispenser),
In an automatic ticket gate or the like, as shown in FIG. 10, a paper sheet a such as a bill or a ticket is sandwiched between paper sheet conveying belts c and d wound around a plurality of pulleys b, b, .... In this state, it is carried in multiple directions. In this way, when the paper sheet a is conveyed by the belts c and d in multiple directions, at the conversion point e where the conveyance direction changes, the winding length around the pulley b is in contact with the belt c in contact with the pulley b. It will be different with no belt d. That is, assuming that the belt thickness is 2t, the pulley radius is R, and the belt winding angle is θ, the winding length of the belt c in contact with the pulley b is (R + t) θ, and the belt not in contact with the pulley b. The winding length of d is (R + 3t) θ, and a difference of 2tθ occurs between the two.

This difference can be absorbed if the distance between the drive pulley and the guide pulley is long, but it is necessary to ensure a long distance between the pulleys in ATM and the like where compactness and high speed are required. The current situation is that it is not possible.

Therefore, when slippage is not given between the belt conveying surfaces of the belts c and d, and when they pass through the pulley b in a state where they are completely in contact with each other, they contact the pulley b due to the difference in the winding length. 2tθ slack part f on belt d
The belt d may be disengaged from the pulley b due to problems such as unstable belt running.

Even if slippage occurs between the belt conveying surfaces, since the friction coefficient between the belts c and d is high, heat is generated and the belts c and d are prematurely worn or abnormal noise is generated, so that the paper sheets are This will hinder the transportation of a.

Therefore, as disclosed in, for example, Japanese Patent Publication No. 61-56140 (hereinafter referred to as Conventional Example 1), a canvas made of polyester is embedded in a shape-retaining rubber layer made of nitrile rubber or styrene-butadiene rubber. , The canvas is partially exposed on the belt transport surface on which the paper sheets are transported, or Japanese Patent Publication No. 59-2468.
As disclosed in Japanese Patent Laid-Open No. 4 and Japanese Patent Laid-Open No. 63-242848 (hereinafter, referred to as Conventional Examples 2 and 3), the uneven shape formed by the weft and the warp of the canvas appears on the belt conveying surface. It is embedded in the shape-retaining rubber layer on the side of the belt conveyance surface, which reduces the friction coefficient of the belt conveyance surface and causes slippage between the belt conveyance surfaces, eliminating the slack of the belt due to the winding length and conveying the belt. A belt for conveying paper sheets has been proposed which is designed to be smoothly carried out.

[0007]

However, in the former prior art example 1 described above, since nitrile rubber or styrene butadiene rubber is used as the shape-retaining rubber layer, there is a problem of rubber dropping, and thus the paper sheet to be conveyed. However, there are problems such as contamination to the inside of the machine, adhesion of the rubber powder that has fallen off the rubber, and contamination inside the transfer system machine. In general, polyester canvas does not easily adhere to rubber as it is, and if it is only partially exposed on the belt conveyance surface, the entire canvas will be exposed due to insufficient adhesion when the rubber falls. However, the conventional example 1 does not disclose any countermeasures such as the bonding process. Further, the nitrile rubber and the styrene-butadiene rubber become harder at a low temperature such as −5 ° C. as compared with the room temperature, and increase the starting torque of the belt. Therefore, problems such as an increase in drive motor capacity occur.

On the other hand, in the latter conventional examples 2 and 3, a thin coating layer is formed on the canvas, but in order to eliminate the friction with the paper sheets and the above-mentioned difference in the winding length, the belt is used. When the gap is slipped, the coating layer is easily peeled off, and the friction coefficient is largely changed as compared with the case where the canvas itself is exposed and the coating layer is present. Such a large change in the friction coefficient causes a problem that the carrying capacity is lower than in the initial stage of use when the coating layer is provided. However, it is very difficult to design the transport system in consideration of the friction coefficient of the belt in advance.

The present invention has been made in view of the above points, and an object of the present invention is to properly bury a canvas in a shape-retaining rubber layer to stabilize the friction coefficient of the belt conveying surface. Especially.

[0010]

In order to achieve the above object, the present invention is directed to a paper sheet conveying belt that conveys paper sheets in multiple directions while sandwiching the paper sheets. Was taken.

That is, the first means for solving the problems of the present invention is that the paper sheet conveying belt comprises a shape-retaining rubber layer and a canvas made of a knitted or woven fabric embedded in the shape-retaining rubber layer. Further, the canvas is partially exposed on the belt transport surface on which the paper sheets are transported. In this case, the thread of the exposed portion is oriented in the belt circumferential direction.

A second solving means of the present invention is characterized in that, in the first solving means, the shape-retaining rubber layer is made of millable urethane rubber.

A third solving means of the present invention is characterized in that, in the first solving means, the shape-retaining rubber layer is made of isoprene rubber and / or ethylene propylene rubber.

A fourth solving means of the present invention is characterized in that, in the first solving means, the yarn constituting the canvas is constituted by a covering yarn in which a polyurethane yarn is covered with a polyamide yarn or a polyester yarn. .

A fifth solving means of the present invention is the same as the fourth solving means, wherein the thickness of the polyurethane yarn is 2.22 tex and the thickness of the polyamide yarn or the polyester yarn is 6.
It is characterized in that it is set to 67 to 13.33 tex.

[0016]

With the above construction, in the first means for solving the problems of the present invention, since the canvas is partially exposed on the belt conveying surface, the coefficient of friction between the paper sheet and the belt conveying surface does not hinder the conveyance. And the friction coefficient between the belts is reduced,
Furthermore, the change in friction coefficient over time is reduced. Further, the contact area between the paper sheet and the shape-retaining rubber layer is reduced, and the paper sheet is less contaminated.

Further, since the threads of the exposed portion of the canvas are oriented in the belt circumferential direction, the friction coefficient between the belts is more stable and the change in the friction coefficient with time is smaller.

According to the second solution of the present invention, due to the nature of the millable urethane rubber constituting the shape-retaining rubber layer, rubber drop from the belt is reduced and contamination in the transport system machine is reduced.

In the third means for solving the problems of the present invention, due to the properties of the isoprene rubber and / or ethylene propylene rubber constituting the shape-retaining rubber layer, the belt does not become hard at low temperature and the starting torque is small.

According to the fourth solution of the present invention, since the canvas is composed of the covering yarn in which the polyurethane yarn is covered with the polyamide yarn or the polyester yarn, the mold is stretched when the belt is formed. When set to, the disorder of the yarn (knitting, weaving) is reduced,
The exposed state of the canvas becomes uniform after the belt is formed. As a result, the friction coefficient becomes constant, and the running stability of the paper sheet increases.

In the fifth solution of the present invention, the thickness of the polyurethane thread, which is the core wire of the covering thread that constitutes the canvas, is 2.22 tex, and the thickness of the polyamide thread or the polyester thread that surrounds the polyurethane thread is 2.22 tex. Since it is set to 6.67 to 13.33 tex, the canvas does not adversely affect the belt performance.

[0022]

Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 show a sheet conveying belt 1 according to an embodiment of the present invention. The belt 1 is provided with a shape-retaining rubber layer 2 that constitutes a belt body, and the shape-retaining rubber layer 2 maintains the shape and tension of the belt 1.
A canvas 3 made of a knitted fabric or a woven fabric is embedded in the shape-retaining rubber layer 2. In addition, as a feature of the present invention, the canvas 3 is embedded unevenly on the belt transport surface 1a side (upper side in the drawing) on which the paper sheet a (see FIG. 10) is transported, and is partially embedded in the belt transport surface 1a. Is exposed to. Also, this canvas 3
The thread of the thread 3a in the exposed portion is oriented in the belt circumferential direction.

Then, the belt 1 constructed as described above.
Is, for example, three pulleys b, b, b and four pulleys b, b, ... Of the conveying device laid out as shown in FIG.
The belt conveying surface 1a is wound around the belts 1 and 1 so that the sheet a is sandwiched in the V-shaped portion where the belts 1 and 1 come into contact with each other, and the belts 1 and 1 are conveyed in multiple directions.

The shape-retaining rubber layer 2 is appropriately selected from synthetic rubbers such as millable urethane rubber, isoprene rubber and ethylene propylene rubber according to the use conditions and use environment. For example, in order to avoid contamination of the inside of the transfer system machine due to rubber falling off from the rubber surface or adhesion to the pulley, millable urethane rubber is used. Further, if low temperature property is required while avoiding increase in starting torque when used at low temperature, isoprene rubber and ethylene propylene rubber are used alone or by blending both. Alternatively, chloroprene rubber may be used to determine the strength of the belt.

As the thread 3a constituting the canvas 3, a covering thread in which a polyurethane thread is covered with a polyamide thread or a polyester thread is used. The thickness of the polyurethane thread as the core wire forming the thread 3a is
About 2.22 tex (20D (denier)) is preferable, and the thickness of the polyamide thread or polyester thread covering it is 6.67 tex (te).
x) (60D (denier)) to 13.33 tex (te
x) (120 D (denier)) is preferable. The thickness of the outside thread is set to 6.67 to 13.33 tex because the strength as a belt becomes low when the tie is less than 6.67 tex, while the canvas 3 is made when the tie is more than 13.33 tex. This is because it acts as a foreign substance. Further, whether the outer thread is a polyamide thread or a polyester thread may be appropriately selected depending on the vulcanization conditions of rubber, adhesiveness and the like.
The surface of the canvas 3 is preferably treated with an epoxy resin, resorcinol / formalin / rubber latex (RFL) or the like. Further, in order to improve the adhesive force with the shape-retaining rubber layer 2, the shape-retaining rubber layer 2 and The same unvulcanized rubber may be dipped in a melted rubber paste and then dried. Also,
The canvas 3 may be knitted or woven as long as a predetermined elongation can be secured.

A method of partially exposing the above-mentioned canvas 3 on the belt conveying surface 1a and orienting the yarns of the exposed yarns 3a in the belt circumferential direction will be described by taking a flat knitted fabric as shown in FIG. 3 as an example. Will be explained. When this plain knitted fabric is viewed from the surface, the yarn 3a portion, which is mainly oriented in the well direction shown by the arrow W1 in FIG. 3, appears on the surface side, and is mainly oriented in the course direction shown by the arrow C1 in FIG. The thread 3a part is present on the back side. When the surface side of FIG. 3 is arranged so as to be the mold surface side during belt molding, the yarns of the canvas 3 are oriented in the belt circumferential direction shown by the arrow W2 in FIG. 4 and the yarns are formed on the belt conveying surface 1a. It can be partially exposed (the exposed portion is shown by a solid line). On the contrary, when the back side of FIG. 3 is arranged so as to be the mold surface side at the time of molding the belt, molding is performed as shown in FIG.
The yarns of the canvas 3 are oriented in the belt width direction indicated by and the yarns are partially exposed on the belt conveying surface 1a (the portion indicated by the broken line is exposed). Further, the variable amount of the exposed state of the canvas 3 can be adjusted by the knitting state, the elongation rate when set in the mold, the vulcanization conditions, etc., and the belt circumferential direction (arrow W2 direction), width direction (arrow C2 direction) or It can also be exposed in both directions.

As described above, since the canvas 3 is partially exposed on the belt conveying surface 1a, the friction coefficient between the paper sheet a and the belt conveying surface 1a should be ensured so as not to hinder the conveyance. In addition, the coefficient of friction between the belts 1 and 1 can be reduced, and further, the change with time of the coefficient of friction can be reduced. Also, the paper sheet a and the shape-retaining rubber layer 2
The contact area with the sheet a can be reduced, and the contamination of the paper sheet a can be reduced.

Further, since the thread of the thread 3a on the exposed portion of the canvas 3 is oriented in the belt circumferential direction, the belt 1,
It is possible to further stabilize the friction coefficient between 1 and to further reduce the change with time of the friction coefficient.

Further, by forming the shape-retaining rubber layer 2 of millable urethane rubber, it is possible to reduce the rubber falling off the belt due to the nature of the rubber and to reduce the contamination in the transport system machine. Further, by forming the shape-retaining rubber layer 2 with isoprene rubber and / or ethylene propylene rubber, it is possible to prevent hardening of the belt at low temperatures due to the properties of the rubber, and avoid an increase in starting torque.

Furthermore, since the canvas 3 is made up of a covering thread in which a polyurethane thread is covered with a polyamide thread or a polyester thread, when the canvas 3 is set in a mold in a stretched state during belt molding, Distortion of yarns (knitting, weaving) can be reduced, and the exposed state of the canvas 3 can be made uniform after belt formation. As a result, the coefficient of friction can be made constant, and the running stability of the paper sheet a can be increased. In addition, the thickness of the polyurethane thread, which is the core wire of the covering thread that constitutes the canvas 3, is 2.22 tex, and the thickness of the polyamide thread or the polyester thread covering it is 6.67 to 1
Since each of them is set to 3.33 tex, it is possible to prevent the canvas 3 from adversely affecting the performance of the belt.

Next, the present invention will be specifically described together with comparative examples.

(Inventive Example 1) A 14-gauge flat knitting machine was used as a canvas, using a covering yarn in which a 2.22 tex (20D) polyurethane yarn was covered with a 7.78 tex (70D) polyester yarn. We used a knitted fabric. Epoxy resin (trade name Deconal EX-521, manufactured by Nagase Kasei Co., Ltd.) and curing agent (trade name Curesol 2E4)
MZ-CN Shikoku Kasei Co., Ltd.) was dissolved in methyl ethyl ketone (MEK) so as to be 5% by weight, and the canvas 3 was dipped in this solution, and then dried to perform an adhesion treatment.

The mold is covered with a canvas subjected to the above-mentioned adhesion treatment,
An unvulcanized millable urethane rubber sheet, which was sheeted to a thickness of 0.6 mm, was double-coated thereon and then 160
Press vulcanization was performed at 20 ° C. for 20 minutes. After cooling, it was taken out of the mold, and the millable urethane rubber side was subjected to polishing and width cutting to prepare a flat belt having a thickness of 0.8 mm. It should be noted that the canvas surface side is the belt conveyance surface side. At this time, the canvas is partially exposed on the belt transport surface,
In addition, the thread of the exposed portion is oriented in the belt circumferential direction.

(Inventive Example 2) As a canvas, a covering yarn in which a 2.22 tex (20D) polyurethane yarn is covered with 11.11 tex (100D) polyamide yarn is used for a 14 gauge flat knitting machine. We used a knitted fabric. This canvas is resorcin, formalin, rubber latex (R
After the dipping in the FL) solution, the adhesive treatment was performed by drying.

The mold is covered with a canvas subjected to the above-mentioned adhesion treatment,
An unvulcanized ethylene propylene rubber sheet, which was sheeted to a thickness of 0.6 mm, was double-coated thereon, and then 15
Press vulcanization was performed at 0 ° C. for 22 minutes. After cooling, it was taken out of the mold, and the ethylene propylene rubber side was subjected to polishing and width cutting to prepare a flat belt having a thickness of 0.8 mm. It should be noted that the canvas surface side is the belt conveyance surface side. At this time, the canvas is partially exposed on the belt transport surface, and the yarns of the exposed portion are oriented in the belt circumferential direction.

(Invention Example 3) As the canvas, the knitted fabric shown in Invention Example 2 was used.

The mold is covered with the above-mentioned canvas, and 0.6 m is placed thereon.
A rubber sheet obtained by blending unvulcanized isoprene rubber and ethylene propylene rubber, which were sheeted to a thickness of m, was covered twice, and then compression vulcanization was performed at 150 ° C. for 20 minutes. After cooling, the flat belt having a thickness of 0.8 mm was prepared by taking it out of the mold, polishing the rubber side and cutting the width. It should be noted that the canvas surface side is the belt conveyance surface side. At this time, the canvas is partially exposed on the belt transport surface, and the yarns of the exposed portion are oriented in the belt circumferential direction.

Comparative Example 1 The knitted fabric shown in Example 1 of the present invention was used as a canvas. Furthermore, the canvas was dipped in a solution of unvulcanized millable urethane rubber and then dried.

The mold is covered with the above-mentioned canvas, and 0.3 m is placed on it.
An unvulcanized millable urethane rubber sheet with a thickness of m was applied once, and another unvulcanized millable urethane rubber sheet with a thickness of 0.5 mm was applied twice. . At this time, the 0.3 mm thick sheet was set so that the viscosity was lower. afterwards,
After vulcanizing at 150 ° C. for 5 minutes at low pressure, compression vulcanization was performed at 160 ° C. for 18 minutes. After cooling, it was taken out of the mold, and the millable urethane rubber side was subjected to polishing and width cutting to prepare a flat belt having a thickness of 0.8 mm.
It should be noted that the canvas surface side is the belt conveyance surface side. This belt is 20 to 30μ on the canvas surface on the belt conveying surface side.
There is a millable urethane coating layer that is as thin as m, and unevenness is formed by canvas.

Comparative experiments were carried out on the belts of Examples 1 to 3 of the present invention and Comparative Example 1. First, the HEIDON-14 type surface tester (Shinto Kagaku Co., Ltd.)
(Manufactured by Mitsui Chemical Co., Ltd.) was used and the measurement was performed under an applied load of 100 g. The results are shown in Table 1.

[0042]

[Table 1]

As shown in Table 1, it is understood that Examples 1 to 3 of the present invention have a higher friction coefficient with respect to the bill and a lower friction coefficient with respect to the belt as compared with Comparative Example 1. in this way,
Since the coefficient of friction with respect to bills is high, the transportability is good, and the coefficient of friction with respect to the belt is low, so that slipping between belts is likely to occur, so that abnormalities such as heat generation and flapping are reduced.

Next, using a testing machine as shown in FIG. 5, the dynamic change of the friction coefficient was evaluated.

A flat pulley 10 having a diameter of 40 mm as a pulley
Was used, and a PPC paper was attached to the surface thereof. One end of the belt 1 is connected to the load cell 11, and the middle portion is passed over the flat pulley 10 so that the belt conveying surface is in contact with the belt, and the weight 12 is connected to the other end so that the load is 0.85 to 0. It was set so as to take about 9 MPa. The flat pulley 10 was rotated, the load at that time was detected by the load cell 11, and the friction coefficient was calculated by the following formula.
The result is shown in FIG.

Μ ′ = (2 / π) ln (T2 / T1) μ ′: Friction coefficient T1: Applied load T2 Measured load As is apparent from FIG.
The friction coefficient of about 2 immediately dropped to 0.5 or less, and the thin coating layer on the cloth on the belt conveying surface side disappeared as the friction coefficient decreased, and the cloth was exposed. Further, the rubber of the fallen coating layer adheres to the pulley surface, and the PPC paper is slightly black. On the other hand, in Examples 1 to 3 of the present invention, the change of the friction coefficient with time was small, and the rubber was hardly attached to the pulley. It can be said that rubber hardly adheres to paper sheets.

In Examples 1 to 3 of the present invention, since the change in the friction coefficient with time is small, there is almost no change in the transportability of the paper sheet after the belt is set, and the sheet can be used under the conditions set at the beginning. On the other hand, if the change in the friction coefficient with time is large as in Comparative Example 1, the transportability after setting the belt changes greatly as the belt is used. It lowers and eventually becomes untransportable.

In Inventive Examples 2 and 3, isoprene rubber and / or ethylene propylene rubber was used, but in this case, the starting torque of the belt at a low temperature is improved. The starting torque of the belt was measured using a device as shown in FIG. A crown pulley having a diameter of 30 mm is used as each of the driving pulley 13 and the driven pulley 14, and each belt 1 is 5%.
The starting torque of the motor 15 was measured by the torque meter 16 in the stretched state. The measurement results are shown in Table 2. As shown in FIG. 7, the starting torque T is the maximum torque T1 when the belt is attached (shown by the solid line) and the maximum torque T2 when the belt is not attached (shown by the broken line). (Difference with the loss torque of the yarn) T = T1-T2.

[0049]

[Table 2]

As shown in Table 2, in Examples 2 and 3 of the present invention, the increase in starting torque at low temperature was 1.2 times or less as compared with Comparative Example 1, and as a result, starting at low temperature was started. In consideration of the above, the motor capacity can be reduced, and the device can be downsized and the power consumption can be reduced. Thus, for improving the low temperature property, isoprene rubber and ethylene propylene rubber may be used alone or in a blend.

Comparative Example 2 The knitted fabric shown in Inventive Example 1 was used as a canvas, and the vulcanization conditions were changed in the method as in Inventive Example 1, whereby the canvas was partially exposed on the belt conveying surface, In addition, a belt was experimentally manufactured in which the yarns of the exposed portion were oriented in the belt circumferential direction and the width direction.

Comparative experiments were carried out on each of the belts of Example 1 of the present invention and Comparative Example 2. The dynamic friction coefficient was measured in the same manner as above using a tester as shown in FIG. Figure 9 shows the measurement results.
Shown in.

As shown in FIG. 9, in Comparative Example 2, the coefficient of friction is stable, but the coefficient of friction is low as a whole, and the conveyance capacity is insufficient. Further, in Comparative Example 2, since the canvas is partially exposed in the width direction of the belt as an exposed state, as compared with the belt partially exposed in the circumferential direction as in Example 1 of the present invention, When the same test is carried out using a tester as shown in Fig. 5, some adhesion to the pulley surface occurs, and when paper sheets are sandwiched between two belts and conveyed, the clamping force is small, The leaves were easy to fall across the width of the belt. As described above, in order to stably convey the paper sheets, the coefficient of friction is preferably about 0.4 to 0.5. The above results are summarized in Table 3.

[0054]

[Table 3]

Comparative Example 3 Inventive Example 1 using a 6.67-tex (60D) polyester temporary yarn as the canvas.
A belt was prototyped in the same manner as in.

In Comparative Example 3, when the canvas is set in the mold, the stitch density phenomenon occurs, and after the belt is formed, the stitch straightness is disturbed. Therefore, the conveyance property becomes unstable, such as the paper sheet meandering during the conveyance. On the other hand, in Example 1 of the present invention, when the canvas was set in the mold, there was almost no coarse / dense phenomenon of the stitches, and the transportability of paper sheets was good.

[0057]

As described above, according to the present invention according to claim 1, the canvas embedded in the shape-retaining rubber layer is partially exposed on the belt conveying surface, and the thread of the exposed portion is belted. Since it is oriented in the circumferential direction, it is possible to secure the friction coefficient between the paper sheet and the belt conveyance surface to such an extent that it does not hinder conveyance,
In addition, the friction coefficient between the belts can be reduced, and further, the change with time of the friction coefficient can be reduced. Further, the contact area between the paper sheet and the shape-retaining rubber layer can be reduced to reduce the contamination of the paper sheet. Further, the friction coefficient between the belts can be made more stable by the orientation of the threads of the exposed portion of the canvas, and the change with time of the friction coefficient can be further reduced.

According to the second aspect of the present invention, since the shape-retaining rubber layer is made of millable urethane rubber, it is possible to reduce the rubber falling from the belt and reduce the contamination inside the machine.

According to the third aspect of the present invention, since the shape-retaining rubber layer is made of isoprene rubber and / or ethylene propylene rubber, it is possible to avoid hardening of the belt at a low temperature and avoid increasing the starting torque. it can.

According to the fourth aspect of the present invention, since the canvas is made up of the covering thread in which the polyurethane thread is covered with the polyamide thread or the polyester thread, the disturbance of the thread of the canvas is reduced during belt molding. The exposed state of the canvas can be made uniform after the belt is formed, and the friction coefficient can be made constant to improve the running stability of the paper sheets.

According to the fifth aspect of the present invention, the thickness of the polyurethane thread which is the core wire of the covering thread which constitutes the canvas is 2.22 tex, and the thickness of the polyamide thread or the polyester thread which covers the surrounding area is 2.22 tex. Is set to 6.67 to 13.33 tex, so that it is possible to prevent the canvas from adversely affecting the belt performance.

[Brief description of drawings]

FIG. 1 is a perspective view of a sheet conveying belt.

FIG. 2 is a cross-sectional view of a sheet conveying belt.

FIG. 3 is a front view of a canvas.

FIG. 4 is a plan view showing an exposed portion of a thread forming the canvas from the shape-retaining rubber layer.

FIG. 5 is an explanatory diagram illustrating a procedure for measuring a friction coefficient.

FIG. 6 is an explanatory diagram illustrating a procedure for measuring a belt starting torque.

FIG. 7 is a characteristic diagram showing fluctuation characteristics of a starting torque.

FIG. 8 is a data diagram showing measurement results of dynamic friction coefficients of belts of Examples 1 to 3 of the present invention and Comparative Example 1.

FIG. 9 is a data diagram showing measurement results of dynamic friction coefficients of belts of Inventive Example 1 and Comparative Example 2.

FIG. 10 is an explanatory diagram illustrating slack of the paper sheet conveyance belt during traveling.

[Explanation of symbols]

 1 Belt for Conveying Paper Sheets 1a Belt Conveying Surface 2 Shape-Retaining Rubber Layer 3 Canvas 3a Thread a Paper Leaf

Claims (5)

[Claims] 1. A paper sheet conveying belt which conveys paper sheets in multiple directions while sandwiching the paper sheet, comprising a shape-retaining rubber layer and a canvas made of a knitted fabric or a woven fabric embedded in the shape-retaining rubber layer. The paper sheet is characterized in that the canvas is partially exposed on a belt conveying surface on which the paper sheet is conveyed, and the thread of the exposed portion is oriented in the belt circumferential direction. Transport belt. 2. The paper sheet conveying belt according to claim 1, wherein the shape-retaining rubber layer is a millable urethane rubber. 3. The paper sheet conveying belt according to claim 1, wherein the shape-retaining rubber layer is isoprene rubber and / or ethylene propylene rubber. 4. The belt for conveying paper sheets according to claim 1, wherein the yarn constituting the canvas is a covering yarn in which a polyurethane yarn is covered with a polyamide yarn or a polyester yarn. 5. The paper sheet according to claim 4, wherein the thickness of the polyurethane yarn is 2.22 tex and the thickness of the polyamide yarn or polyester yarn is 6.67 to 13.33 tex. Transport belt.