JP2001153186A - Flat belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flat belt capable of improving traveling stability, restraining abrasion and damage of a belt side surface, enhancing belt lateral directional flexural rigidity, and of enhancing strength of a core body. SOLUTION: This flat belt is provided with an intermediate layer 1 formed of a thermoplastic resin, a conductor 3 embedded in the intermediate layer 1, and reinforcing cloth 2 respectively adhered to both surfaces of the intermediate layer 1. A surface layer 4 composed of rubber or thermoplastic elastomer can be laminated on an outside surface of the reinforcing cloth 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat belt for transmission and conveyance in which a core wire is embedded.

[0002]

2. Description of the Related Art Conventional flat belts having an aramid fiber as a core include a flat belt having an aramid stranded wire as a core and a belt having an aramid woven fabric as a core. The structures and problems are described below. (1) Flat Belt Containing Aramid Twisted Wire As shown in FIG. 5, this flat belt 10 is formed by embedding an aramid stranded wire as a core 12 in parallel in a pitch line of a belt body 11 made of a thermoplastic resin. It is a thing. The flat belt 10 having such a configuration has the following problems.

[0003] The surface of the belt body 11 is used as it is for transmission and conveyance, and in order to obtain a friction coefficient necessary for transmission and conveyance, the hardness of the resin forming the belt body 11 is limited. Thermoplastic resin cannot be used. As a result, the lateral rigidity of the flat belt 10 (particularly, the compression resistance in the width direction of the flat belt) decreases, and the running property of the belt becomes unstable due to misalignment of the pulley shaft around which the flat belt 10 is wound. easy.

[0004] Since the soft thermoplastic resin is exposed on the side surface of the belt 10, when the belt 10 comes into contact with the frame or the pulley flange, the resin is susceptible to damage such as abrasion and chipping of the resin.

[0005] The bending rigidity in the lateral direction of the belt is low, and if it comes into contact with a flange or the like, the belt is easily deformed, which may cause climbing or deviation. (2) Flat Belt Containing Aramid Woven Fabric As shown in FIG. 6, the flat belt 14 is made of a woven fabric using aramid fibers for the diameter yarn and fibers such as polyester and nylon for the weft as the core body 15. A thermoplastic resin layer 16 is adhered to both sides of the core body 15, and both sides are further covered with a rubber layer 17.

[0006] The flat belt 14 having such a configuration has the following problems.

[0007] Even if the amount of aramid fiber is increased to increase the strength of the core 15, the area of both surfaces of the core 15 which can be used for bonding to the thermoplastic resin layer 16 remains unchanged.
Since the adhesive strength cannot be obtained according to the strength of the core 15, the most important strength of the core is not so much increased, and the problem of peeling of the core 15 is likely to occur.

Since the core body 15 is adhered only from both sides, it is necessary to use a thermoplastic resin having a high strength corresponding thereto, and the surface of the resin layer 16 cannot be used as it is as a flat belt for friction transmission. The surface material (rubber layer) 17 needs to be covered.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks, and has as its object to improve running stability, suppress abrasion and damage on the side surface of the belt, Another object of the present invention is to provide a flat belt capable of increasing the bending rigidity in the lateral direction of the belt and further increasing the core strength.

[0010]

The flat belt according to the present invention comprises an intermediate layer formed of a thermoplastic resin or a thermoplastic elastomer, a core wire embedded in the intermediate layer, and two surfaces of the intermediate layer. And a reinforcing cloth bonded to each other, whereby the object is achieved.

[0011] In one embodiment, there is provided a surface layer made of rubber or thermoplastic elastomer laminated on the outer surface of the reinforcing cloth.

[0012] In one embodiment, the core wire is formed from an aramid strand.

The operation of the present invention is as follows.

[0014] The core wire has both high strength and adhesiveness.
By burying in parallel with the pitch line as a stranded aramid fiber and forming the intermediate layer of the flat belt with a thermoplastic resin, this intermediate layer is formed of, for example, polyurethane, polyester, nylon, etc., to increase flexibility. Together with
Adhesiveness to core wires embedded in the intermediate layer is improved, and furthermore, reinforcing cloths are adhered to both surfaces of the intermediate layer, respectively, thereby increasing lateral rigidity of the belt and stabilizing traveling performance. . In addition, even when the side of the belt comes into contact with an obstacle, deformation and deflection of the belt are suppressed, and the friction with the contacted object is suppressed by the exposed end of the cloth, so that the friction and wear resistance of the flat belt and the chipping resistance can be improved. .

[0015] Further, the use of the vertically stretchable cloth, which is provided with the same, makes it possible to improve the crack resistance on the surface and to enhance the bending resistance against bending with a small-diameter pulley. In addition, the surfaces of both cloths can be coated with a surface layer of rubber, polyurethane, or the like suitable for friction transmission, or for transportation and the like, the surfaces can be made of the cloth itself to reduce friction and wear.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

As shown in FIGS. 1 and 2, the belt 7 of the present invention comprises an intermediate layer 1 made of a thermoplastic resin (or a thermoplastic elastomer) and a core embedded in the intermediate layer 1. 3 and a reinforcing cloth 2 adhered to both surfaces of the mid layer 1 respectively. The flat belt 7 is formed in an endless belt shape, and is used for transmission and conveyance.

As the thermoplastic resin or thermoplastic elastomer forming the intermediate layer 1, for example, polyester elastomer, polyurethane elastomer, polyamide elastomer (nylon 11, nylon 12, etc.) can be used. Here, the thermoplastic elastomer refers to an elastomer having thermoplasticity extrudable from an extruder and exhibiting elastic rubber-like physical properties after curing.

Particularly preferred thermoplastic elastomers are thermoplastic elastomers having adhesiveness and flexibility, such as polyurethane, polyester and nylon.

A plurality of core wires 3 are buried along the longitudinal direction of the intermediate layer 1. The core wire 3 is buried at the center of the intermediate layer 1 in the thickness direction as shown in FIG. That is, the core wires 3 are embedded in the intermediate layer 1 so as to be arranged in parallel in the width direction of the belt along the pitch line of the belt.

As the cord 3 used in the present invention, a non-stretchable reinforced tensile member is used.
A cord formed by bundling high-elastic fibers such as glass fibers and metal fibers such as steel in a cord shape is used, and a particularly preferable core wire 3 is a stranded wire formed from aramid fibers.

As the reinforcing cloth 2 adhered to both surfaces of the intermediate layer 1, a canvas made of nylon fiber, polyester fiber or the like having elasticity in the longitudinal direction can be used. It includes knitted fabric.

The lateral rigidity of the belt can be increased by laminating and bonding the reinforcing cloth 2 on both surfaces of the intermediate layer 1. Further, even when the side surface of the belt comes into contact with an obstacle, the deformation and deflection of the belt can be suppressed, and the friction with the contact object can be suppressed by the exposed end of the reinforcing cloth 2. In addition, the longitudinally stretchable reinforcing cloth 2 provided also has excellent surface crack resistance against bending by a small-diameter pulley, and can increase bending resistance.

In the present invention, a surface layer 4 made of rubber or a thermoplastic elastomer can be laminated on the outer surface of the reinforcing cloth 2 as required. However, in the case of transportation use, the surface of the belt can be formed of the reinforcing cloth 2 to reduce friction and wear.

The surface layer 4 can be formed of rubber suitable for friction transmission, a thermoplastic resin such as a thermoplastic polyurethane elastomer, a thermoplastic elastomer, or the like.

Next, an example of the method for producing the flat belt of the present invention will be described.

As shown in FIGS. 3 and 4, a mold 20 having a large number of protrusions 21 for holding the core wire 3 on the peripheral surface and a cavity formed in the mold 20 are covered. A belt manufacturing apparatus having a band body 22 is used.

Flanges 23 are respectively arranged on both sides of the mold 20, and the molten thermoplastic elastomer 6 is supplied from the extruder 5 into a cavity formed between the flanges 23 and the mold 20. The band body 22 is disposed on the outer peripheral side of the mold 20 so as to cover the thermoplastic elastomer 6 supplied into the cavity from the outside,
After the core wire 3 is wound around the mold 20 and placed on the protrusion 21, the thermoplastic elastomer 6 is supplied into the cavity, and then covered with the band body 22, and the thermoplastic elastomer 6 is cured in that state. . In the drawing, reference numeral 24 denotes a roller.

Thus, the intermediate layer 1 in which the core wire 3 is buried is obtained.

Next, the canvas 2 is placed on the upper and lower surfaces of the intermediate layer 1 respectively.
Are laminated, and the laminate is placed in another mold and heated and pressed to obtain a belt having the canvas 2 laminated on the surface.

Further, when a surface layer is formed on this surface, rubber or a thermoplastic elastomer is supplied to the surface of the canvas 2 in a mold, heated and pressed to obtain a belt-like belt. Thereafter, both ends of the belt-shaped belt are alternately projected and attached to each other, and then the both ends are joined by heat fusion (finger bonding) to obtain an endless belt-shaped flat belt.

[0032]

According to the belt of the present invention, the core wire and the flexible intermediate layer surrounding the core wire can provide a high-strength core body necessary for transmission and a core body adhesive strength commensurate with the high-strength core body. As a result, it is possible to impart belt lateral rigidity sufficient to stabilize the belt running property, and further to improve the side surface damage resistance when the side surface comes into contact with an obstacle. Further, it can be used with a pulley as small as possible.

[Brief description of the drawings]

FIG. 1 is a cutaway perspective view of an essential part of an embodiment of a flat belt according to the present invention.

FIG. 2 is a schematic sectional view of the flat belt shown in FIG.

FIG. 3 is a schematic view of an apparatus used for manufacturing a flat belt.

FIG. 4 is a sectional view taken along line IV-IV of the device shown in FIG. 3;

FIG. 5 is a cutaway perspective view of a main part of a conventional flat belt.

FIG. 6 is a cutaway perspective view of a main part of another conventional flat belt.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Middle layer 2 Reinforcement cloth 3 Core wire 4 Surface layer 6 Thermoplastic elastomer 7 Belt

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B29K 105: 08 B29K 105: 08 (72) Inventor Kazutoshi Kizuka 172 Ikezawacho, Yamatokoriyama-shi, Nara Nita Co., Ltd. Nara Factory (72) Inventor Takashi Yamamoto 172 Ikezawa-cho, Yamatokoriyama-shi, Nara Prefecture Nita Factory F-term (reference) 3F024 AA01 BA01 BA04 CB03 CB09 CB13 CB15 CB19 CB23 4F204 AA24 AA29 AA42 AA45 AD15 AD16 AG16 EA04 EB04 EB04 EB04 EB24 EE07 EF05 EF27 EK03 EK13 EK24 EW02 EW06

Claims (3)

[Claims] 1. A flat plate having an intermediate layer formed of a thermoplastic resin or a thermoplastic elastomer, a core wire embedded in the intermediate layer, and a reinforcing cloth bonded to both surfaces of the intermediate layer. belt. 2. The flat belt according to claim 1, further comprising a surface layer made of rubber or thermoplastic elastomer laminated on an outer surface of the reinforcing cloth. 3. The flat belt according to claim 1, wherein the core wire is formed from a twisted aramid wire.