JP6969989B2 - Blade member of impeller for transporting paper leaves - Google Patents

Description

The present invention relates to a blade member of an impeller for transporting paper leaves used for transporting paper leaves.

Automatic ticket gates, automatic cash register change machines, currency exchange machines, automatic ticket vending machines, etc. are equipped with transport devices for transporting paper sheets such as banknotes, magnetic cards, and tickets. As the transport device, an impeller for transporting paper leaves is used for transporting the paper leaves. The impeller for transporting paper sheets is configured by mounting a plurality of impellers radially in the radial direction orthogonal to the rotation axis of the rotatable cylindrical member. Then, the impeller for transporting paper sheets rotates the blade members at high speed to bring them into contact with the paper sheets, and transports the paper sheets by the frictional force at the time of contact.

Since the blade member comes into contact with paper sheets, plastic deformation occurs after long-term use, and damage such as wear, cracking, and chipping occurs. Due to the plastic deformation of the blade member, the contact with the paper sheets becomes insufficient, which leads to a cause such as a transport error. Therefore, a structure has been proposed in which the blade member can be detachably attached to the cylindrical member so that the blade member can be replaced. That is, the blade member is required to suppress plastic deformation and improve bending durability.

Therefore, in order to suppress plastic deformation of the blade member and improve bending durability, Patent Document 1 proposes a thermosetting urethane molded by casting and a blade member using aramid plying for the core wire. .. Further, Patent Document 2 proposes a blade member using a thermosetting polyurethane and a core wire made of nylon. However, even with the blade members shown in Patent Documents 1 and 2, the bending durability was not sufficiently satisfied. In order to suppress the plastic deformation of the blade member, it is required to have the flexibility to bend while increasing the bending durability and maintaining the strength. That is, it is required that the blade member is not easily plastically deformed, that is, it has a resilience that allows it to return to its original shape while improving bending durability.

Japanese Unexamined Patent Publication No. 2013-155032 Japanese Unexamined Patent Publication No. 2015-205771

The present invention solves the above-mentioned problems, and an object of the present invention is to provide a blade member of an impeller for transporting paper sheets, which suppresses plastic deformation and has improved bending durability and resilience. ..

In order to solve the above problems, at least one blade member of the impeller for paper leaf transport according to the present invention is arranged so as to project from the outer peripheral surface of the rotatable tubular member. A blade member main body made of a thermosetting polyurethane elastomer and a polyester fiber, which is a blade member of a car, at least a part of which is embedded inside the blade member main body, and in the axial direction of the rotation axis of the tubular member. It is characterized by having a plurality of core wires arranged side by side in the same manner.

In this configuration, at least one blade member of the impeller for transporting paper leaves is arranged so as to project from the outer peripheral surface of the rotatable tubular member. The blade member of the impeller for transporting paper leaves may be in contact with the paper strips and transported. The blade member of the impeller for transporting paper leaves includes a blade member main body and a core wire. The blade member body is made of a thermosetting polyurethane elastomer. The core wire is made of polyester fiber. At least a part of the core wire is embedded inside the blade member main body. Further, a plurality of core wires are arranged side by side in the axial direction of the rotation axis of the tubular member.
From the viewpoint of resilience, an elastomer material having excellent elasticity is preferable for the blade member main body, and among the elastomer materials, the thermosetting polyurethane elastomer is particularly excellent in wear resistance and elasticity. Further, the polyester fiber forming the core wire is excellent in both heat resistance and strength. From the viewpoint of bending durability, polyester fiber, aramid fiber, and nylon fiber are preferable for the core wire, and polyester fiber which is hard to buckle against plastic deformation is particularly suitable. Since the main body of the blade member is made of thermosetting polyurethane elastomer and the core wire is made of polyester fiber, the deformation force (compressive force) generated inside the core wire at the time of bending can be reduced, and the bending durability of the blade member can be reduced. And the resilience is improved. That is, the blade member of the impeller for transporting paper leaves of the present invention can suppress plastic deformation and improve bending durability and resilience.

From another viewpoint, it is preferable that the blade member of the impeller for transporting paper leaves of the present invention has the following configuration.
The fineness of the core wire is in the range of 100 to 300 denier. Alternatively, the fineness of the core wire is in the range of 120 to 180 denier.

In this configuration, the fineness of the core wire is preferably in the range of 100 to 300 denier. The diameter of the core wire (core wire diameter) is preferably in the range of 0.10 to 0.19 mm. Further, the fineness of the core wire is more preferably in the range of 120 to 180 denier. That is, the diameter of the core wire is relatively small. When the diameter of the core wire is large, the deformation force (compressive force) inside the core wire (especially near the outer periphery of the impeller for transporting paper leaves) becomes larger when the core wire is bent than when the diameter of the core wire is small. Buckling / breaking is likely to occur. Therefore, by making the diameter of the core wire relatively small, the deformation force (compressive force) generated inside the core wire at the time of bending can be reduced, and the bending durability is improved. That is, the blade member of the impeller for transporting paper sheets having the present configuration can suppress plastic deformation and further improve bending durability and resilience.

From another viewpoint, it is preferable that the blade member of the impeller for transporting paper leaves of the present invention has the following configuration.
The main body of the blade member is made of a thermosetting polyurethane elastomer containing no plasticizer. Alternatively, the blade member main body is made of a thermosetting polyurethane elastomer containing a plasticizer, and the plasticizer is 20 parts by mass or less with respect to 100 parts by weight of the thermosetting polyurethane elastomer. Alternatively, the blade member main body is made of a thermosetting polyurethane elastomer containing a plasticizer, and the plasticizer is 5 parts by mass or less with respect to 100 parts by weight of the thermosetting polyurethane elastomer.

In this configuration, the main body of the blade member is made of a thermosetting polyurethane elastomer containing a plasticizer, and the plasticizer is preferably 20 parts by mass or less with respect to 100 parts by weight of the thermosetting polyurethane elastomer. Further, the main body of the blade member is made of a thermosetting polyurethane elastomer containing a plasticizer, and the plasticizer is more preferably 5 parts by mass or less with respect to 100 parts by weight of the thermosetting polyurethane elastomer. Further, it is more preferable that the blade member main body is made of a thermosetting polyurethane elastomer containing no plasticizer. Here, if the blade member main body contains a large amount of the plasticizer, the plasticizer exudes while the blade member main body repeatedly contacts the paper leaves and migrates to the surface of the paper leaves after long-term use. Therefore, the main body of the blade member in contact with the paper leaves is plastically deformed, and the blade member is warped. Therefore, by reducing the amount of the plasticizer contained in the blade member main body or by not including the plasticizer in the blade member main body, the warp of the blade member is relatively reduced and the restoring force is improved. That is, the blade member of the impeller for transporting paper sheets having the present configuration can suppress plastic deformation and further improve bending durability and resilience.

From another viewpoint, it is preferable that the blade member of the impeller for transporting paper leaves of the present invention has the following configuration.
A plurality of the core wires are arranged side by side in the axial direction of the rotation axis so that the distance between the adjacent core wires is in the range of 0.25 to 0.50 mm. Alternatively, a plurality of the core wires are arranged side by side in the axial direction of the rotation axis so that the distance between the adjacent core wires is in the range of 0.25 to 0.30 mm.

In this configuration, it is preferable that a plurality of core wires are arranged side by side in the axial direction of the rotation axis so that the distance between the adjacent core wires is in the range of 0.25 to 0.50 mm. Alternatively, it is more preferable that a plurality of core wires are arranged side by side in the axial direction of the rotation axis so that the distance between the core wires adjacent to each other is in the range of 0.25 to 0.30 mm. When the distance between the adjacent core wires is less than 0.25 mm, the number of core wires embedded inside the blade member main body increases. Then, the rigidity of the blade member is increased, and the flexibility of the blade member is reduced. Further, when the distance between the adjacent core wires exceeds 0.50 mm (particularly 0.30 mm), the number of core wires embedded inside the blade member main body is reduced. Then, there is a possibility that the deformation force generated inside the core wire at the time of bending cannot be sufficiently reduced. Therefore, if the distance between the adjacent core wires is in the range of 0.25 to 0.50 mm (particularly, in the range of 0.25 to 0.30 mm), the flexibility of the blade member can be appropriately maintained. That is, the blade member of the impeller for transporting paper sheets having the present configuration can suppress plastic deformation and further improve bending durability and resilience.

From another viewpoint, it is preferable that the blade member of the impeller for transporting paper leaves of the present invention has the following configuration.
The blade member is arranged so as to protrude from the outer peripheral surface of the tubular member along a radial direction orthogonal to the axial direction of the rotating shaft of the tubular member, and the core wire is arranged in the radial direction of the rotating shaft of the tubular member. It will be buried along.

Here, "along the radial direction" does not necessarily mean parallel to the radial direction. The radial direction includes a case where it is curved in the radial direction and a case where it is inclined at a predetermined angle with respect to a straight line indicating the radial direction.

As described above, according to the present invention, it is possible to provide a blade member of an impeller for transporting paper sheets, which suppresses plastic deformation and has improved bending durability and restorability.

It is a figure which shows typically the impeller for transporting paper leaf, (a) is a perspective view, (b) is a top view. It is a perspective view which shows typically the cylindrical member of the impeller for transporting paper sheets. It is a figure which shows typically the blade member of the impeller for transporting paper leaves, (a) is the sectional view of a part of the blade member in the radial direction of a rotation axis, (b) is X- It is an X sectional view. It is a schematic diagram schematically showing the test apparatus used in the bending endurance test. It is a schematic diagram which shows the stability test schematically. It is a graph which shows the test result of the stability test.

Embodiments of the present invention will be described with reference to the drawings.
The blade member of the impeller for transporting paper leaves according to the present embodiment is used for the impeller for transporting paper leaves. The impeller for transporting paper leaves is used as a transport device for transporting paper leaves. The transport device is installed in an automatic ticket gate, an automatic cash register change machine, a money changer, an automatic ticket vending machine, etc. to transport or collect paper sheets such as banknotes, magnetic cards, and tickets.

(Composition of impeller for transporting paper leaves)
As shown in FIG. 1, the impeller 1 for transporting paper leaves has a cylinder member 10 and a blade member 20.
In the present embodiment, the blade member 20 is arranged along the radial direction orthogonal to the axial direction G of the rotation axis 11 of the tubular member 10. The blade member 20 is arranged so as to project from the outer peripheral surface of the tubular member 10. In FIG. 1, the axial direction G and the circumferential direction R of the rotating shaft 11 are indicated by arrows. In this embodiment, four blade members 20 are arranged on the tubular member 10. The four blade members 20 are arranged at equal intervals in the circumferential direction R of the rotating shaft 11 of the tubular member 10. The number of blade members 20 is not limited to four. The number of the blade members 20 may be one or more. The number of blade members 20 is preferably 2 to 16. Further, the blade members 20 may not be arranged at equal intervals in the circumferential direction R of the rotation axis of the tubular member 10.

(Structure of tubular member)
As shown in FIG. 2, the tubular member 10 is formed in a substantially cylindrical shape. The tubular member 10 is not limited to a substantially cylindrical shape. The tubular member 10 may be formed in a substantially polygonal shape. The tubular member 10 has a rotating shaft 11 (see FIG. 1B), a base portion 12, a shaft hole 13, and a notch portion 14.

The base 12 may be made of a resin material. The base 12 is made of engineering plastic, for example. Engineering plastics include polyacetal, polyamide, polybutylene terephthalate and the like. The base portion 12 has an upper surface 12a, a bottom surface 12b, and an outer peripheral surface 12c. In the present embodiment, the shaft hole 13 is formed substantially in the center of the upper surface 12a and the bottom surface 12b (see FIG. 1 (b)). The rotating shaft 11 is inserted into the shaft hole 13. That is, the rotating shaft 11 is arranged so that its axial direction is along the axial direction of the tubular member 10. Then, the base portion 12 is non-rotatably supported by the rotating shaft 11. That is, the base 12 is fixed to the rotating shaft 11. The tubular member 10 does not have to have the shaft hole 13. That is, the rotating shaft 11 may be integrally molded with the base 12. As described above, the tubular member 10 is configured to be rotatable. That is, the cylinder member 10 is configured to rotate as the rotation shaft 11 rotates.

The notch portion 14 is formed so as to open to the upper surface 12a. Further, the notch portion 14 is formed so as to open in the outer peripheral surface 12c at the upper part of the outer peripheral surface 12c. The upper portion of the outer peripheral surface 12c is a portion closer to the upper surface 12a than the bottom surface 12b of the outer peripheral surface 12c. Further, the notch portion 14 is formed so as to open into the shaft hole 13. The cutout portion 14 may not be formed so as to open into the shaft hole 13. Further, the notch portion 14 may be formed so as to open to either the upper surface 12a or the bottom surface 12b. Further, the notch portion 14 may be formed so as to open in the upper surface 12a and the bottom surface 12b. The blade member 20 is inserted into the notch portion 14. In the present embodiment, the blade member 20 is inserted into the notch portion 14 through the opening of the upper surface 12a. The shape of the notch portion 14 is formed so that the blade member 20 can be fitted and the rotating shaft 11 does not separate in the radial direction. The notch portion 14 fixes the blade member 20 in the radial direction of the rotating shaft 11. On the other hand, the notch portion 14 allows the blade member 20 to move in the axial direction G of the rotating shaft 11. That is, the tubular member 10 is configured so that the blade member 20 can be attached and detached. As a result, when the blade member 20 requires maintenance due to wear or the like, the blade member 20 can be easily attached and detached and replaced.

(Structure of blade member)
As shown in FIGS. 1 and 3, the blade member 20 has a blade member main body 21 and a core wire 25. In FIG. 1A, the description of the core wire 25 is omitted. In FIG. 1B, the description of the plurality of convex portions 24 of the blade member main body 21 is omitted.

The blade member main body 21 of the present embodiment has a base portion 22, a main body portion 23, and a plurality of convex portions 24. In FIG. 3B, the boundary line between the base portion 22, the main body portion 23, and the plurality of convex portions 24 is shown by a broken line. In the blade member main body 21, the base portion 22, the main body portion 23, and a plurality of convex portions 24 may be integrally molded. The blade member main body 21 is made of a thermosetting polyurethane elastomer. Thermosetting polyurethane elastomer is excellent in abrasion resistance and elasticity.

As shown in FIGS. 1 and 3A, the base portion 22 is formed at an end portion (see FIG. 1) on the rotation shaft 11 side of the main body portion 23. The base portion 22 is formed so as to bulge from the main body portion 23 so that the thickness of the circumferential direction R of the rotating shaft 11 becomes large. A part of the base portion 22 and the main body portion 23 is inserted into the notch portion 14 and fitted. In the present embodiment, the base portion 22 is formed so as to have a substantially semicircular shape in a cross section orthogonal to the axial direction G of the rotating shaft 11. The shape of the base 22 does not have to be substantially semicircular. The shape of the base portion 22 may be any shape as long as the blade member 20 does not separate from the notch portion 14 in the radial direction of the rotating shaft 11, and is, for example, uneven.

The main body 23 is formed in a substantially rectangular parallelepiped shape. In the present embodiment, the main body 23 is formed so that the radial length La of the rotating shaft 11 is longer than the axial length Lc of the rotating shaft 11. The main body 23 is formed so that the length Lc in the axial direction G of the rotating shaft 11 is longer than the length Lb along the circumferential direction R of the rotating shaft 11.

The plurality of convex portions 24 are not essential, but are preferably formed on one or both surfaces of the surface of the main body portion 23 facing the circumferential direction R of the rotating shaft 11. The surface of the main body 23 and / or the surface of the plurality of convex portions 24 is a surface that comes into contact with paper sheets. The number of convex portions 24 is not limited to the number shown in FIG. By providing the convex portion 24 on the surface of the main body portion 23, the main body portion 23 is easily bent when it comes into contact with the paper leaves, and the frictional locking force between the main body portion 23 and the paper leaves is improved. There is little slip between the main body 23 and the paper leaves, and good transportation can be performed.

The thermosetting polyurethane elastomer forming the blade member main body 21 is obtained by thermosetting a prepolymer obtained from a polyol and a polyisocyanate and a curing agent. Alternatively, it can be obtained by thermally curing a polyol, a polyisocyanate, and a curing agent. The thermosetting polyurethane elastomer is preferably blended so that the NCO index value (isocyanate group / active hydrogen group), which is a molar equivalent ratio, is in the range of 0.8 to 1.0. The isocyanate group is a prepolymer or polyisocyanate isocyanate group. The active hydrogen group is an active hydrogen group of a polyol and a curing agent, an active hydrogen group of a polyol, or an active hydrogen group of a curing agent.

The polyol is not limited to having two or more hydroxyl groups in the molecule. As the polyol, for example, polyether polyols, polyester polyols, polylactone-based polyester polyols, polycarbonate polyols, polyolefin polyols and the like can be used alone or in combination of two or more.

Examples of the polyether polyols are polyethylene glycol, polypropylene glycol, polytetramethylene ether glycol and the like.

Here, the polyester polyols are obtained by reacting a dicarboxylic acid compound with a polyol compound. The dicarboxylic acid compound is adipic acid, sebacic acid, itaconic acid, maleic anhydride, terephthalic acid, isophthalic acid, fumaric acid, succinic acid, oxalic acid, malonic acid, glutaric acid, pimelic acid, suberic acid, azelaic acid and the like. .. The polyol compounds are ethylene glycol, diethylene glycol, 1,4-butanediol, 1,6-hexanediol, neopentyl glycol, 1,2-propanediol, 1,3-propanediol, 1,9-nonanediol, 3-. Methyl-1,5-pentanediol, tripropylene glycol, trimethylolpropane, glycerin and the like.

Examples of the polylactone-based polyester polyols are polycaprolactone polyols, poly-β-methyl-δ-valerolactone and the like.
Polycarbonate polyols are obtained by reacting a diol compound with a carbonate compound. The diol compound is 1,3-propanediol, 1,4-butanediol, 1,6-hexanediol, diethylene glycol, polyethylene glycol, polypropylene glycol, polytetramethylene glycol and the like. The carbonate compound is phosgene, dialkyl carbonate, diphenyl carbonate and the like.

The polyolefin polyols are polybutadiene polyols, polyisoprene polyols and the like.

As the polyol, polyether polyols are particularly preferable. The polyether thermosetting urethane formed from the polyether polyols has excellent hydrolysis resistance as compared with the polyester polyurethane formed from the polyester polyols, and therefore deteriorates over time even after long-term use. Has excellent bending durability.

Further, the polyol may be used in combination with a low molecular weight polyol. Low molecular weight polyols include, for example, ethylene glycol, 1,2-propanediol, 1,3-propanediol, 2-methyl-1,3-propanediol, 2-butyl-2-ethyl-1,3-propanediol, and the like. 1,3-butanediol, 1,4-butanediol, neopentaneglycol (2,2-dimethyl-1,3-propanediol), 2-isopropyl-1,4-butanediol, 3-methyl-2,4 -Pentanediol, 2,4-pentanediol, 1,5-pentanediol, 3-methyl-1,5-pentanediol, 2-methyl-2,4-pentanediol, 2,4-dimethyl-1,5- Pentandiol, 2,4-diethyl-1,5-pentanediol, 1,5-hexanediol, 1,6-hexanediol, 2-ethyl-1,3-hexanediol, 2-ethyl-1,6-hexane Fats such as diol, 1,7-heptanediol, 3,5-heptanediol, 1,8-octanediol, 2-methyl-1,8-octanediol, 1,9-nonanediol, 1,10-decanediol, etc. Fats such as group diols, cyclohexanedimethanol (eg 1,4-cyclohexanedimethanol), cyclohexanediols (eg 1,3-cyclohexanediol, 1,4-cyclohexanediol), 2-bis (4-hydroxycyclohexyl) -propane It is a trivalent or higher polyol such as cyclic diol, trimethylolethane, trimethylolpropane, hexitols, pentitols, glycerin, polyglycerin, pentaerythritol, dipentaerythritol, and tetramethylolpropane.

Examples of the polyisocyanate include aromatic isocyanates, aliphatic polyisocyanates, alicyclic polyisocyanates, carbodiimide-modified polyisocyanates of each of the above polyisocyanates, and isocyanurate-modified polyisocyanates of each of the above polyisocyanates. The species can be used alone or in combination of two or more.

Aromatic isocyanates include 2,4-tolylene diisocyanate (2,4-TDI), 2,6-tolylene diisocyanate (2,6-TDI), and 4,4'-diphenylmethane diisocyanate (4,4'-MDI). ), 2,4'-Diphenylmethane diisocyanate (2,4'-MDI), 1,4-phenylenediocyanate, xylylene diisocyanate (XDI), tetramethylxylylene diisocyanate (TMXDI), polymethylene polyphenylene polyisocyanate, trizine diisocyanate ( TODI), 1,5-naphthalenediocyanate (NDI) and the like.

Aliphatic polyisocyanates include hexamethylene diisocyanate (HDI), trimethylhexamethylene diisocyanate (TMHDI), lysine diisocyanate, norbornene diisocyanatomethyl (NBDI) and the like.

The alicyclic polyisocyanates include transcyclohexane-1,4-diisocyanate, isophorone diisocyanate (IPDI), hydrogenated xylylene diisocyanate (H6XDI, hydrogenated XDI), dicyclohexylmethane diisocyanate (H12MDI, hydrogenated MDI) and the like.

As the curing agent, those usually used when molding a thermosetting polyurethane elastomer can be used. The type of the active hydrogen group of the curing agent is, for example, a hydroxyl group, an amino group, an imino group, a carboxyl group, a urethane group, a thiol group, an epoxy group and the like. Specifically, as the curing agent, 4,4'-methylenebis (o-chloroaniline) (MOCA), 4,4'-methylenedianiline (MDA) and the like can be used.

If necessary, the thermosetting polyurethane elastomer contains additives such as a plasticizer, a colorant, an antioxidant, a filler, a hydrolysis inhibitor, a reaction accelerator, a mold release agent, and a flame retardant. be able to. However, it is preferable not to add a plasticizer to the thermosetting polyurethane elastomer used for the blade member main body 21 of the present embodiment.

In the present embodiment, as shown in FIGS. 1 (b) and 3 (a), a part of the core wire 25 is embedded inside the main body 23 of the blade member main body 21. The remaining portion of the core wire 25 may be exposed to the outside. The core wire 25 may be entirely embedded inside the blade member main body 21. In the present embodiment, a plurality of core wires 25 are embedded side by side along the axial direction G of the rotating shaft 11. Further, as shown in FIG. 3B, a plurality of core wires 25 are arranged side by side in the axial direction G of the rotating shaft 11 so that the distance Ld between adjacent core wires 25 is in the range of 0.25 to 0.50 mm. It is preferably arranged. The distance Ld between the adjacent core wires 25 is more preferably in the range of 0.25 to 0.30 mm.

The core wire 25 is made of polyester fiber. The core wire 25 may be a twisted yarn of polyester fiber or an untwisted yarn composed of a single filament. Polyester fiber is excellent in both heat resistance and strength. That is, by embedding the core wire 25 made of polyester fiber in the blade member 20, the bending durability against damage of the blade member 20 is improved. The fineness of the core wire 25 is preferably in the range of 100 to 300 denier. The core wire diameter is preferably in the range of 0.10 to 0.19 mm. The core wire 25 is preferably a twisted yarn having a fineness of 120 to 180 denier. The core wire may include fibers other than polyester fibers.

The blade member 20 has a radial length of the rotary shaft 11 of 15 to 50 mm, a length (width) of the rotary shaft 11 in the axial direction G of 2 to 10 mm, and a circumferential length (thickness) of the rotary shaft 1. It is preferably molded to about 4 mm.

(Manufacturing method of blade member)
Next, a method of manufacturing the blade member 20 will be described. The blade member 20 may be manufactured by casting using a cylindrical mold composed of a double cylindrical mold or a flat mold which is a split mold.

First, a method of manufacturing the blade member 20 when a cylindrical mold is used will be described.
The cylindrical mold is a double cylindrical mold composed of an inner cylindrical mold and an outer cylindrical mold. The inner cylindrical mold is configured to be displaceable inside the outer cylindrical mold. Further, on the outer peripheral surface of the inner cylindrical mold, a recess forming the base portion 22 and the plurality of convex portions 24 is formed.
(1) The core wire 25 is wound around the outer peripheral surface of the inner cylindrical mold. At this time, the core wires 25 are wound so that the distance between the adjacent core wires 25 is a predetermined distance.
(2) The inner cylindrical mold is inserted into the outer cylindrical mold and arranged so as to be substantially concentric.
(3) The liquid material forming the blade member main body 21 is cast into the space formed between the inner cylindrical mold and the outer cylindrical mold. Then, the liquid material is heated and thermoset to form a base portion 22 made of a polyurethane elastomer, a main body portion 23, and a plurality of convex portions 24.
(4) The cylindrical blade member precursor obtained by removing the mold from the cylindrical mold is cut to obtain the blade member 20.

Next, a method of manufacturing the blade member 20 when a flat mold is used will be described.
The flat mold is a split mold of the first flat mold and the second flat mold.
(1) A plurality of core wires 25 are arranged and fixedly arranged on the first flat mold. At this time, the core wires 25 are arranged so that the distance between the adjacent core wires 25 is a predetermined distance.
(2) The second flat mold is aligned with the first flat mold to which the core wire 25 is fixed.
(3) A liquid material forming the blade member main body 21 is cast inside the flat mold. Then, the liquid material is heated and thermoset to form a base portion 22 made of a polyurethane elastomer, a main body portion 23, and a plurality of convex portions 24.
(4) The blade member 20 is obtained by removing the mold from the flat mold.
In the manufacturing method using a flat mold, the blade members 20 may be molded one by one, or an aggregate of a plurality of blade members 20 may be formed. In this case, a flat mold having a size capable of forming an aggregate of a plurality of blade members 20 is used. Then, by cutting the molded aggregate to a predetermined size, a plurality of blade members 20 are obtained.

The blade member 20 of the impeller 1 for transporting paper leaves of the present embodiment has the following features.
At least one blade member 20 of the paper leaf transport impeller 1 protrudes from the outer peripheral surface of the tubular member 10 along a radial direction orthogonal to the axial direction G of the rotating shaft 11 of the rotatable tubular member 10. Be placed. Then, the blade member 20 of the impeller 1 for transporting paper leaves comes into contact with the paper strips and transports them.
The blade member 20 of the impeller 1 for transporting paper leaves includes a blade member main body 21 and a core wire 25. The blade member main body 21 is made of a thermosetting polyurethane elastomer. The core wire 25 is made of polyester fiber. At least a part of the core wire 25 is embedded inside the blade member main body 21 along the radial direction of the rotating shaft 11. A plurality of core wires 25 are arranged side by side in the axial direction G of the rotating shaft 11 of the tubular member 10.
From the viewpoint of resilience, an elastomer material having excellent elasticity is preferable for the blade member main body 21, and among the elastomer materials, the thermosetting polyurethane elastomer is particularly excellent in abrasion resistance and elasticity. Further, the polyester fiber forming the core wire 25 is excellent in both heat resistance and strength. From the viewpoint of bending durability, polyester fiber, aramid fiber, and nylon fiber are preferable for the core wire 25, and polyester fiber which is hard to buckle against plastic deformation is particularly suitable. Since the blade member main body 21 is made of a thermosetting polyurethane elastomer and the core wire 25 is made of polyester, the deformation force (compressive force) generated inside the core wire 25 at the time of bending can be reduced, and the blade member 20 can be made of Bending durability and resilience are improved. That is, the blade member 20 of the impeller 1 for transporting paper leaves can suppress plastic deformation and improve bending durability and resilience.

Further, in the blade member 20 of the impeller 1 for transporting paper leaves of the present embodiment, the fineness of the core wire 25 is preferably in the range of 100 to 300 denier. In this case, the diameter of the core wire 25 is preferably in the range of 0.10 to 0.19 mm. Further, the fineness of the core wire 25 is more preferably in the range of 120 to 180 denier. That is, the diameter of the core wire 25 is relatively small. When the diameter of the core wire 25 is large, the deformation force (compressive force) inside the core wire 25 (especially near the outer peripheral portion) becomes large when the core wire 25 is bent, and buckling / breaking occurs when the core wire 25 has a small diameter. It is more likely to occur. Therefore, by making the diameter of the core wire 25 relatively small, the deformation force (compressive force) generated inside the core wire 25 at the time of bending can be reduced, and the bending durability and the resilience are improved. That is, the blade member 20 of the impeller 1 for transporting paper sheets having the present configuration can suppress plastic deformation and further improve bending durability and resilience.

Further, in the blade member 20 of the impeller 1 for transporting paper leaves of the present embodiment, the blade member main body 21 is made of a thermosetting polyurethane elastomer containing a plasticizer, and the plasticizer is 100 parts by weight of the thermosetting polyurethane elastomer. On the other hand, it is preferably 20 parts by mass or less. Further, the blade member main body 21 is made of a thermosetting polyurethane elastomer containing a plasticizer, and the plasticizer is more preferably 5 parts by mass or less with respect to 100 parts by weight of the thermosetting polyurethane elastomer. Further, the blade member main body 21 is preferably made of a thermosetting polyurethane elastomer containing no plasticizer. Here, if the blade member main body 21 contains a large amount of the plasticizer, the plasticizer exudes while the blade member main body 21 repeatedly contacts the paper leaves and migrates to the surface of the paper leaves during long-term use. .. Therefore, the blade member main body 21 in contact with the paper leaves is plastically deformed, and the blade member 20 is warped. Therefore, by reducing the amount of the plasticizer contained in the blade member main body 21 or by not including the plasticizer in the blade member main body 21, the warp of the blade member 20 is relatively reduced and the restoring force is improved. That is, the blade member 20 of the impeller 1 for transporting paper sheets having the present configuration can suppress plastic deformation and further improve bending durability and resilience.

The fact that the thermosetting polyurethane elastomer does not contain a plasticizer means that the plasticizer is substantially not contained in the thermosetting polyurethane elastomer. Here, "substantially not contained" means that it is permissible to be contained as an impurity but not intentionally added.

Further, in the blade member 20 of the impeller 1 for transporting paper sheets of the present embodiment, the core wire 25 is the axis of the rotating shaft 11 so that the distance between the adjacent core wires 25 is in the range of 0.25 to 0.50 mm. It is preferable that a plurality of them are arranged side by side in the direction. It is more preferable that a plurality of core wires 25 are arranged side by side in the axial direction of the rotating shaft 11 so that the distance between the adjacent core wires 25 is in the range of 0.25 to 0.30 mm. When the distance between the adjacent core wires 25 is less than 0.25 mm, the number of core wires 25 embedded in the blade member main body 21 increases. Then, the rigidity of the blade member 20 increases, and the flexibility of the blade member 20 decreases. Further, when the distance between the adjacent core wires 25 exceeds 0.50 mm (particularly 0.30 mm), the number of core wires 25 embedded in the blade member main body 21 is reduced. Then, there is a possibility that the deformation force generated inside the core wire 25 at the time of bending cannot be sufficiently reduced. Therefore, if the distance between the adjacent core wires 25 is in the range of 0.25 to 0.50 mm (particularly, in the range of 0.25 to 0.30 mm), the flexibility of the blade member 20 can be appropriately maintained. That is, the blade member 20 of the impeller 1 for transporting paper sheets having the present configuration can suppress plastic deformation and further improve bending durability and resilience.

Although the embodiments of the present invention have been described above with reference to the drawings, it should be considered that the specific configuration is not limited to these embodiments and examples. The scope of the present invention is shown not only by the description of the above-described embodiments and examples but also by the scope of claims, and further includes all modifications within the meaning and scope equivalent to the scope of claims.

In the above embodiment, the blade member 20 is provided so as to linearly project from the outer peripheral surface of the tubular member 10 along the radial direction orthogonal to the axial direction G of the rotating shaft 11 of the tubular member 10. However, the structure of the blade member 20 is not limited to this. For example, the blade member may have a shape curved along the radial direction. Alternatively, the blade member 20 may be provided at a predetermined angle in the radial direction. Here, the predetermined angle is arbitrarily set in the range of, for example, 0 ° to 90 °. In the case of the blade member provided at a predetermined angle in the radial direction as described above, the notch portion of the tubular member may be provided with an angle, or the main body portion of the blade member main body may have a bending point. When the main body portion of the blade member main body has a bending point, the position of the bending point may be, for example, near the joint portion with the base portion.

In the present invention, the number of blade members 20 is not limited to four. The number of the blade members 20 may be one or more. Further, the blade members 20 may not be arranged at equal intervals in the circumferential direction R of the rotation axis of the tubular member 10.

In the present invention, the tubular member 10 is not limited to a substantially cylindrical shape. The tubular member 10 may be formed in a substantially polygonal shape. The tubular member 10 does not have to have a shaft hole 13 into which the rotating shaft 11 is inserted. That is, the tubular member 10 may be integrally molded with the rotating shaft 11 and the base 12.

In the present invention, the notch portion 14 may not be formed so as to open into the shaft hole 13. Further, the notch portion 14 may be formed so as to open to either the upper surface 12a or the bottom surface 12b. Further, the notch portion 14 may be formed so as to open in the upper surface 12a and the bottom surface 12b.

In the present invention, the shape of the base 22 does not have to be substantially semicircular. The shape of the base portion 22 may be such that the blade member 20 does not separate from the notch portion 14 in the radial direction of the rotating shaft 11. The shape of the base 22 may be, for example, an uneven shape or the like.

In the present invention, a part of the core wire 25 may be embedded inside the blade member main body 21, and the remaining part may be exposed to the outside. The entire core wire 25 may be embedded inside the blade member main body 21.

Next, examples of the present invention will be described.
In this embodiment, the blade members 20 of the impellers for transporting paper leaves of Examples 1 to 11 and Examples 12 to 15 of 11 and the blades for transporting paper leaves of Reference Comparative Examples 1 to 9 of 9 are used. The blade member 120 of the car was created. Further, in the blade member 20 of the impeller for transporting paper leaves of Reference Examples 1 to 9 and the blade member 120 of the impeller for transporting paper leaves of Reference Comparative Examples 1 to 8, the blade member main body 21 of the blade member 20 is formed. As a liquid polyurethane raw material composition to be prepared, 100 parts by mass of a polyether urethane prepolymer is mixed with 20 parts by mass of dioctylphthalate (DOP) as a plasticizing agent, and the liquid raw material is stirred and mixed at 60 ° C., and 3, as a curing agent. A polyurethane raw material composition obtained by stirring and mixing a liquid raw material in which 10 parts by mass of 3'-dichloro-4,4'-diaminodiphenylmethane (MOCA) was dissolved at 120 ° C. was used. Reference Examples 10 and 11, the blade member 20 of the sheet conveying impeller of Example 12, the amount is 20 parts by weight of the plasticizer used in the blade member 20 of the sheet conveying impeller of Reference Example 1 A polyurethane raw material composition having a plasticizer compounding amount of 10, 5, and 0 parts by mass was used with respect to the polyurethane raw material composition. In the blade member 20 of the impeller for transporting paper leaves of Examples 13, 14 and 15, the amount of the plasticizer used in the blade member 20 of the impeller for transporting paper leaves of Reference Examples 2, 3 and 5, respectively, is blended. A polyurethane raw material composition containing no plasticizer (0 part by mass) was used with respect to the polyurethane raw material composition having an amount of 20 parts by mass. In the blade member 120 of the impeller for transporting paper leaves of Reference Example 9, 100 parts by weight of hydride nitrile rubber (H-NBR), 0.5 part by weight of sulfur, and 20 mass of dioctiflutarate (DOP) as a plasticizer. An unvulcanized rubber sheet kneaded with rubber was used after adding a portion and a vulcanization accelerator. The blade member 20 of the impeller for transporting paper leaves of the reference example and the embodiment and the blade member 120 of the impeller for transporting paper leaves of the reference comparative example have the material and fineness of the core wire 25, and the distance between adjacent core wires. It has the same configuration as the blade member 20 of the impeller for transporting paper sheets according to the above embodiment, except that the amount is variable.

Further, the blade member 20 of the paper leaf transport impeller of the reference example and the embodiment and the blade member 120 of the paper leaf transport impeller of the reference comparative example were manufactured by a cylindrical mold made of a double cylindrical mold. .. The manufacturing process of the blade member 20 of the impeller for transporting paper leaves of Reference Examples and Examples and the blade member 120 of the impeller for transporting paper leaves of Reference Comparative Examples 1 to 8 is as follows. (1) The core wire 25 is spirally wound around the outer peripheral surface of the inner cylindrical mold so that the distance from the adjacent core wire 25 is a predetermined distance. The distance between the adjacent core wires 25 was defined as the core wire cycle. (2) The inner cylindrical mold was inserted and arranged in the outer cylindrical mold. (3) The polyurethane raw material composition was cast into the cavity of the mold and heat-cured at 115 ° C. for 25 minutes. (4) After demolding from the mold, aging treatment was performed at 70 ° C. for 12 hours to obtain a cylindrical blade member precursor. (5) The cylindrical blade member precursor was cut with a width of 3 mm in the direction along the core wire 25. Then, it was further cut into a length of 20 mm in a direction orthogonal to the core wire 25 to obtain a blade member of an impeller for transporting paper leaves. (6) The obtained blade members 20 and 120 were attached to the polyacetal cylindrical member 10 to form an impeller 1 for transporting paper leaves.
In the manufacturing process of the blade member 120 of the impeller for transporting paper leaves of Reference Comparative Example 9, the steps (2) to (4) among the above steps (1) to (6) are changed to the following steps. It is a replacement. (2a) After winding the unvulcanized rubber sheet on the core wire, the outer cylindrical mold was placed inside the cylindrical jacket of the vulcanizer. (3a) Vulcanization was performed by putting it in a vulcanizing can, pressurizing it with a vulcanizer, and heating it to form a cylindrical blade member precursor. (4a) After demolding from the mold, a cylindrical blade member precursor was obtained.

The materials and fineness of the core wire 25 of the blade member 20 of the impeller for transporting paper leaves of Reference Examples and Examples and the blade member 120 of the impeller for transporting paper leaves of Reference Comparative Example were changed as follows. Table 1 summarizes the materials and fineness of the blade member 20 of the impeller for transporting paper leaves of Reference Examples and Examples. Table 2 summarizes the materials and fineness of the core wire 25 of the blade member 120 of the impeller for transporting paper leaves in the reference comparative example.
Reference Examples 1, 4 , 5, 8 to 11, Examples 12, 15, Reference Comparative Example 9: Polyester fiber (PET, 60 count, 150 denier)
Reference Example 2, Example 13: Polyester fiber (PET, 90 count, 100 denier)
Reference Example 3, Example 14: Polyester fiber (PET, 40 count, 300 denier)
Reference example 6: Polyester fiber (PET, 100 count, 90 denier)
Reference example 7: Polyester fiber (PET, 30 count, 450 denier)
Reference Comparative Example 1: Nylon fiber (66 nylon, 60 count, 150 denier)
Reference Comparative Example 2: Nylon fiber (66 nylon, 50 count, 210 denier)
Reference Comparative Example 3: Nylon Fiber (66 Nylon, 40th, 300 Denier)
Reference Comparative Example 4: Aramid Fiber (66 Nylon, 30th, 450 Denier)
Reference Comparative Example 5: Aramid fiber (para-aramid, 60th, 150 denier)
Reference Comparative Examples 6 and 8: Aramid fiber (para-based aramid, 45th, 200 denier)
Reference Comparative Example 7: Aramid fiber (para-aramid, 30th, 450 denier)

The period of the core wire 25 of the blade member 120 of the blade member 20 and the sheet conveying impeller of Reference Comparative Example of the sheet conveying impeller reference example, as follows, was changed. Table 1 summarizes the period of the core wire 25 of the blade member 20 of the impeller for transporting paper leaves in the reference example. Table 2 summarizes the period of the core wire 25 of the blade member 120 of the impeller for transporting paper leaves in the reference comparative example. As described above, the period of the core wires 25 is the interval between the adjacent core wires 25.
Reference Examples 1-3, 6, Reference Comparative Examples 1-3, 5, 6, 9: 0.3 mm
Reference example 4: 0.25 mm
Reference Examples 5, 7, Reference Comparative Examples 4, 7: 0.5 mm
Reference Example 8, Reference Comparative Example 8: 0.2 mm
Reference example 9: 0.7 mm

As shown in Tables 1 and 2, in Reference Examples 1 to 9, the combination of the material of the main body and the material of the core wire is a combination of "polyurethane + polyester". In Reference Comparative Examples 1 to 4, the combination of the material of the main body and the material of the core wire is a combination of "polyurethane + nylon". In Reference Comparative Examples 5 to 8, the combination of the material of the main body and the material of the core wire is a combination of "polyurethane + aramid". In Reference Comparative Example 9, the combination of the material of the main body and the material of the core wire is "hydrogenated nitrile rubber + polyester".

Then, the blade member 120 of the blade member 20 and the sheet conveying impeller of Reference Comparative Example of the sheet conveying impeller Reference Example were subjected to bending durability test and recovery test.

The bending durability test was performed on the blade member 20 of the impeller for transporting paper leaves of Reference Examples 1 to 9 and the blade member 120 of the impeller for transporting paper leaves of Reference Examples 1 to 9. In the bending durability test, a test device 30 as shown in FIG. 4 was used. In the bending durability test test device 30, the motor 31 and the slide base 32 of the stainless steel plate are connected to each other via the bar 33. The bending durability test test device 30 is configured such that the slide base 32 attached to the bar 33 reciprocates in the order of the arrows in FIGS. 4 (a) and 4 (b) by the rotation of the motor 31. ing. Then, the blade member 120 of the blade member 20 and the sheet conveying impeller of Reference Comparative Example of the sheet conveying impeller of Reference Example to the fixing member 35 is attached. The blade member 20 of the impeller for transporting paper leaves in the reference example and the blade member 120 of the impeller for transporting paper leaves in the reference comparative example are in contact with the slide base 32, and the reciprocating motion of the slide base 32 causes FIG. It is attached so as to bend in the order of the arrows in a) and FIG. 4 (b). Using this test device 30, 1 is used with respect to the blade member 20 of the impeller for transporting paper leaves of Reference Examples 1 to 9 and the blade member 120 of the impeller for transporting paper leaves of Reference Comparative Examples 1 to 9. The reciprocating motion was performed at a speed of 300 bendings / minute, with the reciprocating as one bending. Then, the blade member 20 of the impeller for transporting paper leaves in the reference example and the blade member 120 of the impeller for transporting paper leaves in the reference comparative example are damaged at the time of bending about 70,000 times and after bending about 1.7 million times. , The presence or absence of plastic deformation was determined.

Table 1 shows the test results of the bending durability test of the blade member 20 of the impeller for transporting paper sheets of Reference Examples 1 to 9. Table 2 shows the test results of the bending durability test of the blade member 120 of the impeller for transporting paper sheets of Reference Comparative Examples 1 to 9. In the bending durability test, the rate of decrease in the length of the blade member of the paper leaf transport impeller and the state of plastic deformation of the blade member of the paper leaf transport impeller are based on bending or bending. , The presence or absence of plastic deformation of the blade member of the impeller for transporting paper leaves was determined. In the bending durability test, the length L11 from the center of the cylindrical member 10 to the tip of the blade member 20 in the radial direction orthogonal to the axial direction G of the rotating shaft 11 of the cylindrical member 10 before the bending durability test, and the bending durability. After the test, the apparent length L12 from the center of the cylindrical member 10 to the tip of the blade member 20 in the radial direction orthogonal to the axial direction of the rotating shaft 11 of the cylindrical member 10 is measured. Then, the ratio of the difference in length between L11 and L12 was measured as the ratio of the decrease in the length of the blade member. Then, when there was no decrease in the length of the blade member of the impeller for transporting paper leaves, it was determined that there was no plastic deformation. If the decrease in the length of the blade member of the impeller for transporting paper leaves is less than 2% and the state of plastic deformation is bending, the degree of plastic deformation of the blade member of the impeller for transporting paper leaves is A. Was determined. If the decrease in the length of the blade member of the impeller for transporting paper leaves is less than 2% and the state of plastic deformation is refractive, the degree of plastic deformation of the blade member of the impeller for transporting paper leaves is B. Was determined. If the decrease in the length of the blade member of the paper leaf transport impeller is 2% or more and the state of plastic deformation is bending or refraction, the degree of plastic deformation of the blade member of the paper leaf transport impeller Was determined to be C. Then, the comprehensive evaluation of the bending durability of the blade member of the impeller for transporting paper leaves was determined as follows. If the blade member of the impeller for transporting paper leaves was not damaged or plastically deformed, it was marked with ⊚. If the blade member of the impeller for transporting paper leaves was not damaged, but there was slight plastic deformation, it was marked as ◯. If the blade member of the impeller for transporting paper leaves is damaged, but there is no problem in practical use, it is marked as Δ. If the blade member of the impeller for transporting paper leaves is damaged and cannot be used practically, it is marked with x.

As shown in Tables 1 and 2, the blade member 20 of the impeller for transporting paper leaves of Reference Examples 1 to 9 in which the combination of the material of the main body and the material of the core wire is a combination of "polyurethane + polyester" has a comprehensive evaluation. It was ◎, ○, △. Further, the blade member 120 of the impeller for transporting paper leaves of Reference Comparative Examples 1 to 9, in which the combination of the material of the main body and the material of the core wire is a combination other than "polyurethane + polyester", had a comprehensive evaluation of x. .. That is, the blade member 20 of the impeller for transporting paper leaves of Reference Examples 1 to 9 in which the combination of the material of the main body and the material of the core wire is a combination of "polyurethane + polyester" is another combination in Reference Comparative Example 1. It was confirmed that the bending durability was excellent as compared with the blade member 120 of the impeller for transporting paper leaves of ~ 9.

Further, in the blade member 20 of the impeller for transporting paper leaves of Reference Examples 1 to 9, the fineness of the core wire was varied and the superiority and inferiority were compared. Comparing the blade member 20 of the sheet conveying impeller of Reference Example 1,2,3,6,7 were variable fineness of the core wire, Reference Example fineness is in the range of 100 to 300 denier 1,2,3 The overall evaluation of the blade member 20 of the impeller for transporting paper leaves was ◎ or ○, and it was confirmed that the blade member 20 of the impeller for transporting paper leaves in Reference Examples 6 and 7 was superior in bending durability. did it. Since the core wire of the blade member 20 of the impeller for transporting paper leaves of Reference Example 6 is extremely fine with a fineness of 90 denier, the rigidity of the blade member 20 cannot be maintained, the blade member 20 is easily damaged, and a slight tip crack occurs. It is considered to be. It is probable that the blade member 20 of the impeller for transporting paper leaves in Reference Example 7 has a core wire with a fineness of 450 denier and is thick, so that the deformation force inside the core wire at the time of bending is large and buckling of the core wire occurs. Since the blade member 20 of the impeller for transporting paper leaves in Reference Example 7 has a thick core wire and the core wire cannot be arranged at a cycle of 0.3 mm, the core wire has a cycle of 0.5 mm. That is, it was confirmed that when the fineness of the core wire of the blade member was reduced, breakage and plastic deformation were further suppressed.

Further, in the blade member 20 of the impeller for transporting paper leaves of Reference Examples 1 to 9, the period of the core wire was varied and the superiority and inferiority were compared. Comparing the blade members 20 of the impellers for transporting paper sheets of Reference Examples 1, 4, 5, 8 and 9 in which the period of the core wire is varied, Reference Example 1 and the period of which the period is in the range of 0.25 to 0.50 mm are 1. The overall evaluation of the blade member 20 of the impeller 20 for transporting paper leaves in 4 and 5 is ◎ or ○, and the bending durability is superior to the blade member 20 of the impeller 20 for transporting paper leaves in Reference Examples 8 and 9. I was able to confirm that. It is probable that the blade member 20 of the impeller for transporting paper leaves of Reference Example 8 had a core wire cycle as dense as 0.2 mm and the flexibility of the blade member was reduced, so that the core wire buckled. In the blade member 20 of the impeller for transporting paper leaves of Reference Example 9, since the period of the core wire is widened to 0.7 mm, the rigidity of the blade member cannot be maintained, the blade member is easily damaged, and the tip is slightly cracked. it is conceivable that. That is, it was confirmed that when the period of the core wire of the blade member was reduced, the breakage and the plastic deformation were further suppressed.

In the stability test, the amount of the plasticizer added was varied and the difference in stability was confirmed. The stability test was performed on the blade members 20 of the impellers for transporting paper leaves in Reference Examples 1 , 2, 3, 5, 10, 11, and Examples 12 to 15, respectively. In the stability test, a test device 40 as shown in FIG. 5A was used. The stability test test apparatus 40 is configured to have a motor (not shown). In the test device 40 for the resilience test, four blade members 20 of the impellers for transporting paper sheets of Reference Example 1 and Reference Example 3 are mounted on the cylindrical member 10 rotatably attached to the motor. Restoring test, reference examples 1,2,3,5,10, 11, Example 12-15 conveying impeller 1 Each sheet was rotated at 1000 rpm, the reference example 1, 2, 3, 5, The blade members 20 of the impellers for transporting paper leaves in 10 , 11 and Examples 12 to 15 were continuously brought into contact with the plain paper 41. FIG. 5B is a schematic diagram showing the shape of the blade member 20 before the stability test, and FIG. 5C is a schematic diagram showing the shape of the blade member 20 after the stability test. In the resilience test, the length L1 from the center of the cylindrical member 10 to the tip of the blade member 20 in the radial direction orthogonal to the axial direction G of the rotation axis 11 of the cylindrical member 10 before the resilience test and after the resilience test. The apparent length L2 from the center of the cylindrical member 10 to the tip of the blade member 20 in the radial direction orthogonal to the axial direction of the rotating shaft 11 of the cylindrical member 10 is measured. Then, the ratio of the difference in length between L1 and L2 was measured as the reduction rate of the tip of the blade member (hereinafter, referred to as "blade member tip reduction rate"). Table 3 shows the reduction rate of the tip of the blade member in the stability tests conducted for Reference Examples 1 , 2, 3, 5, 10, 11 and Examples 12 to 15, respectively. Table 3 shows the test results of the bending durability test and the stability test.

Further, FIG. 6 shows the test results of the stability test of the blade member 20 of the impeller for transporting paper leaves of Reference Example 1 and Example 12. Here, the number of passes shown in FIG. 6 is the number of times the blade member 20 comes into contact with plain paper. In FIG. 6, the average value of the four blade members is plotted as the blade member tip reduction rate. As shown in FIG. 6, as the number of passes increases, the rate of decrease in the tip of the blade member increases. This is because the blade member 20, which was initially straight, bends in one direction and undergoes plastic deformation (bending deformation) in an arch shape due to wear of the tip of the blade member 20, and the bending deformation gradually increases. be. Here, the improvement of the restoring force means that the force for returning to the original straight shape after bending and deforming becomes large. That is, the difference in length between the blade member 20 before and after the stability test is reduced. Therefore, from the test results of the stability test shown in FIG. 6, the blade member 20 to which the plasticizer of Example 12 is not added has a smaller tip reduction rate of the blade member 20 to which the plasticizer of Reference Example 1 is added. You can see that it has become. From the above, it was confirmed that the blade member 20 to which the plasticizer of Example 12 was not added had improved restoring force as compared with the blade member 20 of Reference Example 1.

As shown in Table 3, the blade member tip reduction rate at the time of 50 million passes of each of the measured examples is 2.3% for the blade member 20 of the impeller for transporting paper leaves of Reference Example 1. On the other hand, the blade member 20 of the paper leaf transport impeller of Reference Example 10 was 1.9%, the blade member 20 of the paper leaf transport impeller of Reference Example 11 was 1.7%, and the paper leaf of Example 12. The blade member 20 of the impeller for class transfer was 1.4%. As a result, it can be seen that as the amount of the plasticizer is reduced, the tip reduction rate decreases, and the stability is improved while maintaining the bending durability. Similarly, the paper leaves of Examples 13, 14 and 15 which do not contain a plasticizer for the blade members 20 of the impellers for transporting paper leaves of Reference Examples 2, 3 and 5 having different core wire fineness and period. Comparing the blade members 20 of the impellers for transportation, it can be seen that the tip reduction rate is reduced and the recoverability is improved in each case.

From the above, according to the reference example and the reference comparative example of the present invention, the main body of the blade member of the blade member of the impeller for transporting paper leaves is a thermosetting polyurethane elastomer rather than a hydrogenated nitrile rubber (H-NBR). It was found that it is hard to be plastically deformed and the bending durability can be improved. Further, when the blade member main body of the blade member of the impeller for transporting paper leaves is made of a thermosetting polyurethane elastomer, the following was found. It was found that if the core wire of the blade member is a polyester fiber instead of a nylon fiber or an aramid fiber, the bending durability can be enhanced. Further, it was found that when the period of the core wire of the blade member is 0.25 mm, 0.3 mm or 0.5 mm rather than 0.2 mm or 0.7 mm, plastic deformation is less likely to occur and bending durability can be improved. .. Further, it was found that when the period of the core wire of the blade member is 0.25 mm or 0.3 mm rather than 0.5 mm, plastic deformation is less likely to occur and bending durability can be improved. Further, it was found that the fineness of the core wire of the blade member was 100 denier, 150 denier, and 300 denier rather than 90 denier or 450 denier, because it was less likely to be plastically deformed and the bending durability could be improved. Further, it was found that the fineness of the core wire of the blade member is less likely to be plastically deformed at 150 denier than at 100 denier or 300 denier, and the bending durability can be improved. Further, the main body of the blade member may contain a plasticizer in the thermosetting polyurethane elastomer, but it has been found that the upper limit thereof is preferably 20 parts by mass with respect to 100 parts by weight of the thermosetting polyurethane elastomer. Furthermore, it was found that the restoring force of the blade member body is improved when the thermosetting polyurethane elastomer does not contain a plasticizer.

Therefore, by comparing the reference examples in Tables 1 and 2 with the reference comparative examples, the blade member of the impeller for transporting paper leaves is a thermosetting polyurethane elastomer in which the blade member body contains 20 parts by weight of a plasticizer, and the blade is a blade. It was found that if the core wire of the member is a polyester fiber, plastic deformation can be suppressed and bending durability can be improved. Further, in comparison with Reference Examples 1 to 5 and Reference Examples 6 to 9, in order to further enhance the bending durability, the fineness of the core wire is in the range of 100 to 300 denier (more preferably in the range of 120 to 180 denier). It was found that the period of the core wire should be in the range of 0.25 to 0.50 mm (more preferably in the range of 0.25 to 0.30 mm).
Next, as in Reference Example 1 (20 parts by weight of plasticizer), Reference Example 10 (10 parts by weight of plasticizer), Reference Example 11 (5 parts by weight of plasticizer), and Example 12 (excluding plasticizer) in Table 3. It can be seen that as the amount of the plasticizer is reduced, the tip reduction rate decreases and the resilience improves while maintaining the bending durability.
After all, the blade member of the impeller for transporting paper leaves is a thermosetting polyurethane elastomer whose main body does not contain a plasticizer, the core wire of the blade member is polyester fiber, and the fineness of the core wire is 100 to 300 denier. It was found that if the period of the core wire is in the range of 0.25 to 0.50 mm, the recoverability can be increased to the maximum value while maintaining the excellent bending durability.

By utilizing the present invention, it is possible to provide a blade member of an impeller for transporting paper sheets, which suppresses plastic deformation and has improved bending durability.

1 Impeller for transporting paper leaves 10 Cylinder member 11 Rotating shaft 20 Wing member 21 Wing member body 25 Core wire G Axial direction of the rotating shaft of the cylinder member

Claims (5)

A blade member of an impeller for transporting paper leaves, which is arranged so as to protrude from the outer peripheral surface of the rotatable tubular member.
A blade member body made of a thermosetting polyurethane elastomer that does not contain a plasticizer,
It is made of polyester fiber, and at least a part thereof is embedded inside the blade member main body, and a plurality of core wires arranged side by side in the axial direction of the rotation axis of the tubular member are provided.
The fineness of the core wire is in the range of 100 to 300 denier, and the core wire is aligned in the axial direction of the rotation axis so that the distance between the adjacent core wires is in the range of 0.25 to 0.50 mm. blade member for conveying paper sheets impeller, characterized in that you have been arrayed. The blade member of the impeller for transporting paper leaves according to claim 1, wherein the fineness of the core wire is in the range of 120 to 180 denier. 2. The blade member of the impeller for transporting paper leaves according to any one of the items. The blade member of the impeller for transporting paper leaves according to any one of claims 1 to 3, wherein the core wire has a core wire diameter of 0.10 to 0.19 mm. The blade member is arranged so as to project from the outer peripheral surface of the tubular member along a radial direction orthogonal to the axial direction of the rotation axis of the tubular member.
The blade member of the impeller for transporting paper leaves according to any one of claims 1 to 4, wherein the core wire is embedded along the radial direction of the rotation axis of the tubular member.

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