JP2021102970A - Endless belt and method for manufacturing the same - Google Patents

Endless belt and method for manufacturing the same Download PDF

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JP2021102970A
JP2021102970A JP2019233363A JP2019233363A JP2021102970A JP 2021102970 A JP2021102970 A JP 2021102970A JP 2019233363 A JP2019233363 A JP 2019233363A JP 2019233363 A JP2019233363 A JP 2019233363A JP 2021102970 A JP2021102970 A JP 2021102970A
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layer
reinforcing sheet
end portion
endless belt
intermediate layer
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JP7446105B2 (en
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広大 永野
Kodai Nagano
広大 永野
直道 中井
Naomichi Nakai
直道 中井
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Nitta Corp
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Nitta Corp
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Priority to CN202011461246.0A priority patent/CN113022054A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B25/00—Layered products comprising a layer of natural or synthetic rubber
    • B32B25/04—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B25/08—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B25/00—Layered products comprising a layer of natural or synthetic rubber
    • B32B25/14—Layered products comprising a layer of natural or synthetic rubber comprising synthetic rubber copolymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/304—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/40—Layered products comprising a layer of synthetic resin comprising polyurethanes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/02—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions
    • B32B3/06—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions for securing layers together; for attaching the product to another member, e.g. to a support, or to another product, e.g. groove/tongue, interlocking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/02—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions
    • B32B3/08—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions characterised by added members at particular parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G1/00—Driving-belts
    • F16G1/04—Driving-belts made of fibrous material, e.g. textiles, whether rubber-covered or not
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G1/00—Driving-belts
    • F16G1/06—Driving-belts made of rubber
    • F16G1/08—Driving-belts made of rubber with reinforcement bonded by the rubber
    • F16G1/10—Driving-belts made of rubber with reinforcement bonded by the rubber with textile reinforcement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G1/00—Driving-belts
    • F16G1/14—Driving-belts made of plastics
    • F16G1/16—Driving-belts made of plastics with reinforcement bonded by the plastic material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G1/00—Driving-belts
    • F16G1/21—Driving-belts built-up from superimposed layers, e.g. zig-zag folded
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G1/00—Driving-belts
    • F16G1/22—Driving-belts consisting of several parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0261—Polyamide fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0261—Polyamide fibres
    • B32B2262/0269—Aromatic polyamide fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0276—Polyester fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10—Inorganic fibres
    • B32B2262/101—Glass fibres

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Belt Conveyors (AREA)
  • Knitting Of Fabric (AREA)

Abstract

To provide an endless belt that can further improve strength in a joint and a method for manufacturing the endless belt.SOLUTION: An endless belt 10 includes a tension member layer 12, a first intermediate layer 14 formed of thermoplastic resin and provided on one surface of the tension member layer 12, a first surface layer 18 provided on a surface of the first intermediate layer 14, and a joint 15 where a first end 22 and a second end 24 having a complementary shape to each other are joined. The endless belt includes a reinforcing sheet 26 embedded in the first intermediate layer 14 between a first end 22 and a second end 24. The reinforcing sheet 26 has a cavity 28 penetrated in a thickness direction. The first intermediate layer 14 has a surface side intermediate part 27 arranged in the first surface layer 18 side of the reinforcing sheet 26, a tension member side intermediate part 29 arranged in the tension member layer 12 side of the reinforcing sheet 26, and a connection part 31 for connecting the surface side intermediate part 27 and the tension member side intermediate part 29 through the cavity 28.SELECTED DRAWING: Figure 1

Description

本発明は、無端ベルト及び無端ベルトの製造方法に関するものである。 The present invention relates to an endless belt and a method for manufacturing an endless belt.

高速伝動ベルトとしての無端ベルトは、一般的に、心体層を備える帯状ベルトを用いる。無端ベルトは、帯状ベルトの両端を、接着剤や熱接着を用いて一体に接着した継手部を有する。帯状ベルトの両端は、互いに相補的な形状、例えば、フィンガー形状である。 As the endless belt as the high-speed transmission belt, a belt-shaped belt having a body layer is generally used. The endless belt has a joint portion in which both ends of the belt-shaped belt are integrally bonded by using an adhesive or heat bonding. Both ends of the belt have a shape complementary to each other, for example, a finger shape.

無端ベルトの継手部は、心体層が切断された状態であるため、引張強度が低い。したがって、無端ベルトは、継手部を起点として破断しやすいという問題があった。 The joint portion of the endless belt has a low tensile strength because the core body layer is cut off. Therefore, the endless belt has a problem that it is easily broken starting from the joint portion.

無端ベルトの継手部の引張強度を向上する解決策は、継手部をまたがって補強布を配置し、補強布と心体層を一体的に接合することである（例えば、特許文献１）。特許文献１には、帆布で形成された心体層と、熱可塑性樹脂を含む中間層と、表面帆布層とを積層したベルトが開示されている。補強布は、熱可塑性樹脂を塗布した織布を用いる。 A solution for improving the tensile strength of the joint portion of the endless belt is to arrange a reinforcing cloth across the joint portion and integrally join the reinforcing cloth and the core body layer (for example, Patent Document 1). Patent Document 1 discloses a belt in which a core body layer formed of canvas, an intermediate layer containing a thermoplastic resin, and a surface canvas layer are laminated. As the reinforcing cloth, a woven cloth coated with a thermoplastic resin is used.

特開２０１５−１０６５３号公報Japanese Unexamined Patent Publication No. 2015-10653

上記特許文献１の無端ベルトの補強布において、織布と熱可塑性樹脂は互いに表面同士のみで接着しており、当該熱可塑性樹脂を介して心体層、中間層、及び表面帆布層のいずれか２層と接着している。補強布における織布と熱可塑性樹脂の接着力は十分とはいえず、織布が熱可塑性樹脂から剥離してしまう、という問題があった。補強布と熱可塑性樹脂が剥離した場合、上記継手部は十分な強度が得られない。 In the endless belt reinforcing cloth of Patent Document 1, the woven cloth and the thermoplastic resin are adhered to each other only on the surfaces thereof, and any one of the core body layer, the intermediate layer, and the surface canvas layer is adhered to each other via the thermoplastic resin. It is adhered to the two layers. The adhesive strength between the woven fabric and the thermoplastic resin in the reinforcing cloth is not sufficient, and there is a problem that the woven fabric is peeled off from the thermoplastic resin. When the reinforcing cloth and the thermoplastic resin are peeled off, the joint portion does not have sufficient strength.

本発明は、継手部における強度をより向上することができる無端ベルト及び無端ベルトの製造方法を提供することを目的とする。 An object of the present invention is to provide an endless belt and a method for manufacturing an endless belt, which can further improve the strength of a joint portion.

本発明に係る無端ベルトは、心体層と、熱可塑性樹脂で形成され、前記心体層の一方の表面に設けられた第１中間層と、前記第１中間層の表面に設けられた第１表面層と、互いに相補的な形状を有する第１端部と第２端部が接合された継手部とを備え、前記第１端部と前記第２端部の間の前記第１中間層に埋設された補強シートを備え、前記補強シートは、厚み方向に貫通した空隙を有し、前記第１中間層は、前記補強シートの前記第１表面層側に配置される表面側中間部と、前記補強シートの前記心体層側に配置される心体側中間部と、前記空隙を通じて前記表面側中間部と前記心体側中間部とをつなぐ接続部とを有する。 The endless belt according to the present invention is formed of a heart body layer and a thermoplastic resin, and is provided on one surface of the heart body layer, a first intermediate layer, and a first intermediate layer provided on the surface of the first intermediate layer. The first intermediate layer comprising one surface layer and a joint portion to which a first end portion and a second end portion having complementary shapes are joined to each other, and between the first end portion and the second end portion. The reinforcing sheet is provided with a reinforcing sheet embedded in the reinforcing sheet, the reinforcing sheet has a gap penetrating in the thickness direction, and the first intermediate layer is formed with a surface-side intermediate portion arranged on the first surface layer side of the reinforcing sheet. It has a core body side intermediate portion arranged on the mind body layer side of the reinforcing sheet, and a connecting portion connecting the surface side intermediate portion and the mind body side intermediate portion through the gap.

本発明に係る無端ベルトの製造方法は、心体層と、熱可塑性樹脂で形成され、前記心体層の一方の表面に設けられた第１中間層と、前記第１中間層の表面に設けられた第１表面層とを備えた帯状ベルトの長手方向の第１端部及び第２端部における前記第１中間層に、それぞれ先端から長手方向に切り込みを入れ、前記第１中間層を、前記第１表面層に一体化された表面側中間部と、前記心体層に一体化された心体側中間部とに分離する工程と、前記第１端部と前記第２端部を、互いに相補的な形状に加工する工程と、突き合わせた状態の前記第１端部と前記第２端部にまたがるように、前記心体側中間部の表面に、厚み方向に貫通した空隙を有する補強シートを配置する工程と、前記第１表面層に一体化された前記表面側中間部及び前記第１表面層で前記補強シートを覆い、前記表面側中間部と前記心体側中間部が前記空隙を通じて一体となるように、前記第１端部と前記第２端部を接合する工程とを備える。 The method for manufacturing an endless belt according to the present invention is provided on a first intermediate layer formed of a core body layer and a thermoplastic resin and provided on one surface of the heart body layer, and on the surface of the first intermediate layer. The first intermediate layer at the first end portion and the second end portion in the longitudinal direction of the strip-shaped belt provided with the first surface layer is notched in the longitudinal direction from the tip, respectively, and the first intermediate layer is formed. The step of separating the surface-side intermediate portion integrated into the first surface layer and the core-body-side intermediate portion integrated into the core body layer, and the first end portion and the second end portion are separated from each other. A reinforcing sheet having a gap penetrating in the thickness direction is provided on the surface of the intermediate portion on the core body side so as to straddle the first end portion and the second end portion in a butt state with the step of processing into a complementary shape. In the step of arranging, the reinforcing sheet is covered with the surface-side intermediate portion and the first surface layer integrated with the first surface layer, and the surface-side intermediate portion and the core body-side intermediate portion are integrated through the gap. The step of joining the first end portion and the second end portion is provided so as to be such.

本発明によれば、第１中間層が、補強シートの空隙を通じて、一体であるので、補強シートとより強固に接合している。したがって無端ベルトは、継手部における強度をより向上することができる。 According to the present invention, since the first intermediate layer is integrated through the gaps of the reinforcing sheet, it is more firmly bonded to the reinforcing sheet. Therefore, the endless belt can further improve the strength at the joint portion.

図１のａは本実施形態に係る無端ベルトの平面図、図１のｂは本実施形態に係る無端ベルトの図１のａに示す１ｂ−１ｂ断面図である。FIG. 1a is a plan view of the endless belt according to the present embodiment, and FIG. 1b is a cross-sectional view taken along the line 1b-1b shown in FIG. 1a of the endless belt according to the present embodiment. 本実施形態に係る無端ベルトの断面を模式的に示す部分拡大断面図である。It is a partially enlarged sectional view which shows typically the cross section of the endless belt which concerns on this embodiment. 本実施形態に係る無端ベルトの製造方法を段階的に示す断面図であり、図３のｃは切り込みを入れる前、図３のｄは切り込みを入れた後である。It is sectional drawing which shows the manufacturing method of the endless belt which concerns on this embodiment step by step, c of FIG. 3 is before making a cut, and d of FIG. 3 is after making a cut. 本実施形態に係る無端ベルトの製造方法を段階的に示す断面図であり、図４のｅは補強シートを設置した状態、図４のｆは分離部をかぶせた状態である。It is sectional drawing which shows the manufacturing method of the endless belt which concerns on this Embodiment step by step, e of FIG. 4 is the state which installed the reinforcing sheet, and f of FIG. 4 is the state which covered the separation part. 本実施形態に係る無端ベルトの使用状態を示す模式図である。It is a schematic diagram which shows the use state of the endless belt which concerns on this embodiment.

以下、図面を参照して本発明の実施形態の詳細を説明する。 Hereinafter, the details of the embodiment of the present invention will be described with reference to the drawings.

（全体構成）
図１に示す無端ベルト１０は、心体層１２、第１中間層１４、第２中間層１６、第１表面層１８、及び第２表面層２０を備える。無端ベルト１０の厚さは、通常０．５〜１０．０ｍｍである。無端ベルト１０の幅は、通常１０〜５０００ｍｍである。図１におけるｘ方向を「長手方向」、ｙ方向を「幅方向」、ｚ方向を「厚み方向」という。 (overall structure)
The endless belt 10 shown in FIG. 1 includes a core body layer 12, a first intermediate layer 14, a second intermediate layer 16, a first surface layer 18, and a second surface layer 20. The thickness of the endless belt 10 is usually 0.5 to 10.0 mm. The width of the endless belt 10 is usually 10 to 5000 mm. In FIG. 1, the x direction is referred to as "longitudinal direction", the y direction is referred to as "width direction", and the z direction is referred to as "thickness direction".

心体層１２は、ポリエステル繊維、ナイロン繊維、アラミド繊維、又はガラス繊維を縦糸、横糸の原料として用いた帆布で形成される。 The core body layer 12 is formed of a canvas using polyester fiber, nylon fiber, aramid fiber, or glass fiber as a raw material for warp and weft.

第１中間層１４は心体層１２の一方の表面に、第２中間層１６は心体層１２の他方の表面に、それぞれ設けられている。第１中間層１４及び第２中間層１６は、熱可塑性樹脂で形成される。熱可塑性樹脂は、例えば、ポリウレタンエラストマー、ポリアミドエラストマー、ポリエステルエラストマー、ポリ塩化ビニル系エラストマー、又はポリオレフィン系エラストマーである。 The first intermediate layer 14 is provided on one surface of the heart body layer 12, and the second intermediate layer 16 is provided on the other surface of the heart body layer 12. The first intermediate layer 14 and the second intermediate layer 16 are formed of a thermoplastic resin. The thermoplastic resin is, for example, a polyurethane elastomer, a polyamide elastomer, a polyester elastomer, a polyvinyl chloride-based elastomer, or a polyolefin-based elastomer.

第１表面層１８は第１中間層１４の表面に、第２表面層２０は第２中間層１６の表面に、それぞれ設けられている。第１表面層１８及び第２表面層２０は、ゴム、樹脂、帆布、又は合成皮革で形成されている。ゴムは、例えば、ミラブルウレタン、ニトリルゴム（ＮＢＲ）、水素化ニトリルゴム（Ｈ−ＮＢＲ）、エチレンプロピレンジエンゴム（ＥＰＤＭ）、エチレンプロピレンゴム（ＥＰＭ）、又はクロロスルフォン化ポリエチレンである。樹脂は、ポリウレタンエラストマー、ポリアミドエラストマー、ポリエステルエラストマー、ポリ塩化ビニル系エラストマー、又はポリオレフィン系エラストマーである。帆布は、例えば、ポリエステル繊維、又はナイロン繊維などの繊維を使用した帆布でもよい。第２表面層２０は、上記具体例の中から選択することができ、第１表面層１８と同じでもよいし、異なっていてもよい。 The first surface layer 18 is provided on the surface of the first intermediate layer 14, and the second surface layer 20 is provided on the surface of the second intermediate layer 16. The first surface layer 18 and the second surface layer 20 are made of rubber, resin, canvas, or synthetic leather. The rubber is, for example, miraculous urethane, nitrile rubber (NBR), hydrogenated nitrile rubber (H-NBR), ethylene propylene diene rubber (EPDM), ethylene propylene rubber (EPM), or chlorosulphonized polyethylene. The resin is a polyurethane elastomer, a polyamide elastomer, a polyester elastomer, a polyvinyl chloride-based elastomer, or a polyolefin-based elastomer. The canvas may be, for example, a canvas using fibers such as polyester fiber or nylon fiber. The second surface layer 20 can be selected from the above specific examples, and may be the same as or different from the first surface layer 18.

無端ベルト１０は、継手部１５を有する。継手部１５はフィンガー継手である。継手部１５は、接合された状態の第１端部２２と第２端部２４とを有する。第１端部２２は、帯状ベルト（図示しない）の長手方向の先端を含む。第２端部２４は、帯状ベルト（図示しない）の長手方向の基端を含む。無端ベルト１０は、第１端部２２と第２端部２４を接合して、無端状とされている。 The endless belt 10 has a joint portion 15. The joint portion 15 is a finger joint. The joint portion 15 has a first end portion 22 and a second end portion 24 in a joined state. The first end 22 includes a longitudinal tip of a strip belt (not shown). The second end 24 includes a longitudinal base end of a strip belt (not shown). The endless belt 10 has an endless shape by joining the first end portion 22 and the second end portion 24.

第１端部２２及び第２端部２４は、互いに相補的な複数の凹部１９及び凸部２１をそれぞれ有する。凹部１９は、無端ベルト１０の長手方向の内側に凹んだ二等辺三角形及び直角三角形である。凸部２１は、長手方向の外側に突出した二等辺三角形及び直角三角形である。第１端部２２及び第２端部２４は、複数の凹部１９及び凸部２１が形成された鋸刃形状である。凹部１９及び凸部２１の幅方向の長さは５〜３０ｍｍ、凹部１９及び凸部２１の長手方向の長さは５〜２５０ｍｍである。 The first end portion 22 and the second end portion 24 each have a plurality of recesses 19 and protrusions 21 complementary to each other. The recess 19 is an isosceles triangle and a right triangle recessed inward in the longitudinal direction of the endless belt 10. The convex portion 21 is an isosceles triangle and a right triangle protruding outward in the longitudinal direction. The first end portion 22 and the second end portion 24 have a saw blade shape in which a plurality of concave portions 19 and convex portions 21 are formed. The length of the concave portion 19 and the convex portion 21 in the width direction is 5 to 30 mm, and the length of the concave portion 19 and the convex portion 21 in the longitudinal direction is 5 to 250 mm.

無端ベルト１０の第１中間層１４は、第１端部２２と第２端部２４の境界をまたぐ位置に、補強シート２６を有する。補強シート２６は、前記第１端部２２の凹部１９の基端２３から、前記第２端部２４の凹部１９の基端２５までの範囲よりも広い領域に配置されている。補強シート２６の長手方向の長さは、凹部１９又は凸部２１の長手方向の長さの２倍程度であり、１０〜５００ｍｍである。補強シート２６の幅方向の長さは、無端ベルト１０の幅方向の長さと同じでもよい。補強シート２６の幅方向の長さは、無端ベルト１０の幅方向の長さの５０％以上、６０％以上、７０％以上、８０％以上、９０％以上、又は９５％以上でもよい。 The first intermediate layer 14 of the endless belt 10 has a reinforcing sheet 26 at a position straddling the boundary between the first end portion 22 and the second end portion 24. The reinforcing sheet 26 is arranged in a region wider than the range from the base end 23 of the recess 19 of the first end portion 22 to the base end 25 of the recess 19 of the second end portion 24. The length of the reinforcing sheet 26 in the longitudinal direction is about twice the length of the concave portion 19 or the convex portion 21 in the longitudinal direction, and is 10 to 500 mm. The length of the reinforcing sheet 26 in the width direction may be the same as the length of the endless belt 10 in the width direction. The length of the reinforcing sheet 26 in the width direction may be 50% or more, 60% or more, 70% or more, 80% or more, 90% or more, or 95% or more of the length in the width direction of the endless belt 10.

補強シート２６は、図２に示すように、厚み方向に貫通した複数の空隙２８を有する。補強シート２６は、ポリエステル繊維、ナイロン繊維、アラミド繊維、又はガラス繊維の編布で形成される。補強シート２６の空隙２８は、上記繊維と繊維の間の隙間である。 As shown in FIG. 2, the reinforcing sheet 26 has a plurality of voids 28 penetrating in the thickness direction. The reinforcing sheet 26 is made of a knitted fabric of polyester fiber, nylon fiber, aramid fiber, or glass fiber. The gap 28 of the reinforcing sheet 26 is a gap between the fibers.

第１中間層１４は、補強シート２６の第１表面層１８側に配置される表面側中間部２７と、補強シート２６の心体層１２側に配置される心体側中間部２９と、空隙２８を通じて表面側中間部２７と心体側中間部２９とをつなぐ接続部３１とを有する。接続部３１は、それぞれの空隙２８を埋めるように形成されている。接続部３１は、空隙２８を通じて補強シート２６を厚み方向へ貫いている。表面側中間部２７と、心体側中間部２９と、接続部３１は、一体である。補強シート２６の表面は表面側中間部２７と心体側中間部２９に挟まれ、空隙２８は接続部３１で埋められている。補強シート２６は、接着剤を用いずに第１中間層１４と一体化している。 The first intermediate layer 14 includes a surface side intermediate portion 27 arranged on the first surface layer 18 side of the reinforcing sheet 26, a core body side intermediate portion 29 arranged on the core body layer 12 side of the reinforcing sheet 26, and a gap 28. It has a connecting portion 31 that connects the front surface side intermediate portion 27 and the mind body side intermediate portion 29 through. The connecting portion 31 is formed so as to fill the respective voids 28. The connecting portion 31 penetrates the reinforcing sheet 26 in the thickness direction through the gap 28. The surface side intermediate portion 27, the mind body side intermediate portion 29, and the connecting portion 31 are integrated. The surface of the reinforcing sheet 26 is sandwiched between the surface side intermediate portion 27 and the mind body side intermediate portion 29, and the gap 28 is filled with the connecting portion 31. The reinforcing sheet 26 is integrated with the first intermediate layer 14 without using an adhesive.

補強シート２６は、厚み方向からみた、単位面積当たりの空隙２８の割合が３５％以上７０％以下である。空隙２８の割合が７０％以下であれば、補強シート２６は十分な強度を有する。空隙２８の割合が３５％以上であれば、表面側中間部２７と、心体側中間部２９と、接続部３１が十分に一体となり、第１中間層１４と補強シート２６の剥離を抑制することができる。 The reinforcing sheet 26 has a ratio of voids 28 per unit area of 35% or more and 70% or less when viewed from the thickness direction. When the ratio of the voids 28 is 70% or less, the reinforcing sheet 26 has sufficient strength. When the ratio of the voids 28 is 35% or more, the surface side intermediate portion 27, the mind body side intermediate portion 29, and the connecting portion 31 are sufficiently integrated, and the peeling of the first intermediate layer 14 and the reinforcing sheet 26 is suppressed. Can be done.

（製造方法）
図３のｃに示すように、接合前の前記第１端部２２と前記第２端部２４の前記第１中間層１４に、それぞれ先端から長手方向に１か所切り込みを入れ、切り込み部３２を形成する。図３のｃは、代表して第１端部２２について示している。切り込み部３２は、長手方向に平行に形成する。切り込み部３２の長手方向の長さは、後に形成する凹部１９及び凸部２１の長手方向の長さよりも長い。切り込み部３２は、第１中間層１４の厚みの中心位置に形成するのが好ましい。切り込み部３２を形成した後の第１中間層１４は、第１表面層１８と一体の表面側中間部２７と、心体層１２と一体の心体側中間部２９とに分離される。 (Production method)
As shown in c of FIG. 3, one notch is made in the first intermediate layer 14 of the first end portion 22 and the second end portion 24 before joining in the longitudinal direction from the tip thereof, and the notch portion 32 is formed. To form. FIG. 3c shows the first end portion 22 as a representative. The cut portion 32 is formed parallel to the longitudinal direction. The length of the notch 32 in the longitudinal direction is longer than the length of the recess 19 and the convex portion 21 to be formed later in the longitudinal direction. The cut portion 32 is preferably formed at the center position of the thickness of the first intermediate layer 14. The first intermediate layer 14 after forming the cut portion 32 is separated into a surface-side intermediate portion 27 integrated with the first surface layer 18 and a mind-body-side intermediate portion 29 integrated with the mind-body layer 12.

切り込み部３２を形成した後の第１端部２２は、図３のｄに示すように、第１表面層１８と表面側中間部２７とからなる分離部３３を有する。分離部３３は、表面側中間部２７と心体側中間部２９が離れる方向に折り返すことができる。表面側中間部２７と心体側中間部２９が離れる方向は、第１表面層１８の表面へ向かって、分離部３３の先端を折り曲げる方向である。図示しないが、切り込み部３２を形成した後の第２端部２４は、同様に、分離部３３を有する。 The first end portion 22 after forming the cut portion 32 has a separation portion 33 including a first surface layer 18 and a surface side intermediate portion 27, as shown in d in FIG. The separation portion 33 can be folded back in the direction in which the surface side intermediate portion 27 and the mind body side intermediate portion 29 are separated from each other. The direction in which the surface-side intermediate portion 27 and the mind-body-side intermediate portion 29 are separated is a direction in which the tip of the separation portion 33 is bent toward the surface of the first surface layer 18. Although not shown, the second end 24 after forming the notch 32 also has a separating 33.

第１端部２２と第２端部２４に、公知の工具を用いて、複数の凹部１９及び凸部２１をそれぞれ形成する。凹部１９及び凸部２１を形成する長手方向の範囲は、切り込み部３２が形成された領域より狭い。第１表面層１８を上向きとし、第１端部２２と第２端部２４を、互いの凹部１９と凸部２１を組み合わせて、突き合わせる。 A plurality of concave portions 19 and convex portions 21 are formed at the first end portion 22 and the second end portion 24 by using a known tool. The range in the longitudinal direction in which the concave portion 19 and the convex portion 21 are formed is narrower than the region in which the cut portion 32 is formed. The first surface layer 18 faces upward, and the first end portion 22 and the second end portion 24 are butted against each other by combining the concave portion 19 and the convex portion 21.

図４のｅに示すように、分離部３３を折り返した状態で、第１端部２２と第２端部２４の境界をまたぐように、心体側中間部２９上に補強シート２６を配置する。補強シート２６は、凹部１９及び凸部２１が形成された範囲を超え、切り込み部３２が形成された領域内に配置する。 As shown in E of FIG. 4, the reinforcing sheet 26 is arranged on the center body side intermediate portion 29 so as to straddle the boundary between the first end portion 22 and the second end portion 24 in a state where the separation portion 33 is folded back. The reinforcing sheet 26 is arranged beyond the range in which the concave portion 19 and the convex portion 21 are formed and in the region in which the cut portion 32 is formed.

図４のｆに示すように、補強シート２６を分離部３３で覆い、表面側中間部２７を補強シート２６表面に接触させる。分離部３３同士の凹部１９と凸部２１を組み合わせて突き合わせる。この状態で第１端部２２と第２端部２４を中心に、少なくとも切り込み部３２が形成された領域を、厚み方向に加圧しながら加熱する。加熱することによって、第１中間層１４及び第２中間層１６の熱可塑性樹脂が溶融し、第１端部２２と第２端部２４の先端同士が融着する。 As shown in f of FIG. 4, the reinforcing sheet 26 is covered with the separating portion 33, and the surface side intermediate portion 27 is brought into contact with the surface of the reinforcing sheet 26. The concave portion 19 and the convex portion 21 of the separating portions 33 are combined and abutted. In this state, the region where at least the cut portion 32 is formed is heated while pressurizing in the thickness direction, centering on the first end portion 22 and the second end portion 24. By heating, the thermoplastic resins of the first intermediate layer 14 and the second intermediate layer 16 are melted, and the tips of the first end portion 22 and the second end portion 24 are fused to each other.

第１中間層１４において、表面側中間部２７と心体側中間部２９の溶融した熱可塑性樹脂は、補強シート２６の空隙２８を通じて流動し、空隙２８を介して互いに融着する。熱可塑性樹脂が冷却固化することによって、第１中間層１４及び第２中間層１６は、第１端部２２と第２端部２４同士の間で、一体となる。 In the first intermediate layer 14, the molten thermoplastic resin of the surface side intermediate portion 27 and the mind body side intermediate portion 29 flows through the voids 28 of the reinforcing sheet 26 and fuses with each other through the voids 28. As the thermoplastic resin is cooled and solidified, the first intermediate layer 14 and the second intermediate layer 16 are integrated between the first end portion 22 and the second end portion 24.

表面側中間部２７と心体側中間部２９は、接続部３１を介して一体となる。この結果、第１中間層１４は、第１端部２２と第２端部２４の境界をまたぐ位置で補強シート２６を保持する。上記のようにして、第１中間部１４に補強シート２６が埋設された無端ベルト１０を得ることができる。 The surface side intermediate portion 27 and the mind body side intermediate portion 29 are integrated via the connecting portion 31. As a result, the first intermediate layer 14 holds the reinforcing sheet 26 at a position straddling the boundary between the first end portion 22 and the second end portion 24. As described above, the endless belt 10 in which the reinforcing sheet 26 is embedded in the first intermediate portion 14 can be obtained.

（作用及び効果）
無端ベルト１０は、図５に示すように、第２表面層２０と駆動プーリ３０の表面が接触するように、駆動プーリ３０に装着され、伝動ベルト又は搬送ベルトとして用いることができる。表面側中間部２７、心体側中間部２９、及び接続部３１は、補強シート２６の空隙２８を通じて一体であるので、第１中間層１４が補強シート２６とより強固に接合している。したがって無端ベルト１０は、補強シート２６と第１中間層１４の剥離を抑制し、継手部１５の強度をより向上することができる。厚み方向からみた、単位面積当たりの空隙２８の割合が３５％以上７０％以下であることによって、継手部１５の強度をより確実に向上することができる。 (Action and effect)
As shown in FIG. 5, the endless belt 10 is attached to the drive pulley 30 so that the second surface layer 20 and the surface of the drive pulley 30 are in contact with each other, and can be used as a transmission belt or a transport belt. Since the surface side intermediate portion 27, the mind body side intermediate portion 29, and the connecting portion 31 are integrated through the gap 28 of the reinforcing sheet 26, the first intermediate layer 14 is more firmly joined to the reinforcing sheet 26. Therefore, the endless belt 10 can suppress the peeling of the reinforcing sheet 26 and the first intermediate layer 14 and further improve the strength of the joint portion 15. When the ratio of the voids 28 per unit area as viewed from the thickness direction is 35% or more and 70% or less, the strength of the joint portion 15 can be improved more reliably.

無端ベルト１０は、心体層１２に対し駆動プーリ３０の半径方向の外側において引張応力、内側において圧縮応力が生じる。無端ベルト１０の第１中間層１４は、心体層１２に対し駆動プーリ３０の半径方向外側に配置される。引張応力が生じる第１中間層１４に設けられた補強シート２６は、継手部１５における引張強度をより向上する。 In the endless belt 10, tensile stress is generated on the outer side in the radial direction of the drive pulley 30 and compressive stress is generated on the inner side with respect to the core body layer 12. The first intermediate layer 14 of the endless belt 10 is arranged radially outside the drive pulley 30 with respect to the core body layer 12. The reinforcing sheet 26 provided in the first intermediate layer 14 in which tensile stress is generated further improves the tensile strength in the joint portion 15.

無端ベルト１０は、補強シート２６を第１中間層１４に埋設するために接着剤を必要としない。一般的に接着剤は第１中間層１４の熱可塑性樹脂より、硬度が高い。継手部１５は、接着剤を有していないため、他の部分と同じ柔軟性を有する。したがって、無端ベルト１０は、駆動プーリ３０上の異物に無端ベルト１０が乗り上げるなどして第１中間層１４により大きい引張応力が生じた場合であっても、継手部１５に応力が集中することを防ぎ、亀裂の発生を抑制することができる。 The endless belt 10 does not require an adhesive to embed the reinforcing sheet 26 in the first intermediate layer 14. Generally, the adhesive has a higher hardness than the thermoplastic resin of the first intermediate layer 14. Since the joint portion 15 does not have an adhesive, it has the same flexibility as other portions. Therefore, the endless belt 10 prevents the stress from being concentrated on the joint portion 15 even when a larger tensile stress is generated on the first intermediate layer 14 due to the endless belt 10 riding on a foreign matter on the drive pulley 30. It can be prevented and the occurrence of cracks can be suppressed.

空隙２８を通じて補強シート２６を厚み方向へ貫いている接続部３１には、無端ベルト１０を引っ張る力によって、せん断応力が生じる。接続部３１のせん断応力は、第１中間層１４と補強シート２６の面方向の位置ずれを抑制する。接続部３１には、厚み方向に引張応力が生じる。接続部３１の引張応力は、補強シート２６表面との間の接着力と相俟って補強シート２６を第１中間層１４から剥がれにくくする。 Shear stress is generated in the connecting portion 31 that penetrates the reinforcing sheet 26 in the thickness direction through the gap 28 due to the force that pulls the endless belt 10. The shear stress of the connecting portion 31 suppresses the displacement of the first intermediate layer 14 and the reinforcing sheet 26 in the surface direction. Tensile stress is generated in the connection portion 31 in the thickness direction. The tensile stress of the connecting portion 31 together with the adhesive force between the reinforcing sheet 26 and the surface of the reinforcing sheet 26 makes it difficult for the reinforcing sheet 26 to peel off from the first intermediate layer 14.

編布で形成された補強シート２６の空隙２８は、繊維同士の間の隙間であり、複雑な形態である。接続部３１は当該空隙２８を埋めるようにして形成されている。補強シート２６は、第１中間層１４に対し繊維が複雑に絡み合うようにして一体化される。したがって第１中間層１４と補強シート２６は、熱可塑性樹脂と織布が表面のみで接着する場合に比べ、剥がれにくい。 The gap 28 of the reinforcing sheet 26 formed of the knitted fabric is a gap between the fibers and has a complicated form. The connecting portion 31 is formed so as to fill the gap 28. The reinforcing sheet 26 is integrated with the first intermediate layer 14 so that the fibers are intricately entangled with each other. Therefore, the first intermediate layer 14 and the reinforcing sheet 26 are less likely to be peeled off than when the thermoplastic resin and the woven fabric are adhered only on the surface.

（変形例）
本発明は上記実施形態に限定されるものではなく、本発明の趣旨の範囲内で適宜変更することが可能である。 (Modification example)
The present invention is not limited to the above-described embodiment, and can be appropriately modified within the scope of the gist of the present invention.

本実施形態に係る継手部１５はフィンガー継手であるが、本発明における無端ベルトの継手は、相互に相補的であれば特に限定されず、例えば、先端に向かって厚みが漸減するスカイバー継手でもよい。 The joint portion 15 according to the present embodiment is a finger joint, but the endless belt joint in the present invention is not particularly limited as long as it is complementary to each other, and may be, for example, a skybar joint whose thickness gradually decreases toward the tip. ..

本実施形態に係る無端ベルト１０は、１本の帯状ベルトの両端部を突き合せて接合された１本のベルトで形成できるが、本発明の無端ベルトはこれに限定されず、別々のベルトの両端部の端面同士を接合して形成してもよい。 The endless belt 10 according to the present embodiment can be formed by one belt in which both ends of one belt-shaped belt are abutted and joined, but the endless belt of the present invention is not limited to this, and of separate belts. It may be formed by joining the end faces of both ends.

本実施形態に係る無端ベルト１０は、第１中間層１４に補強シート２６を設ける場合について説明したが、本発明はこれに限らない。補強シート２６は、第２中間層１６に設けてもよく、第１中間層１４及び第２中間層１６に設けてもよい。 The endless belt 10 according to the present embodiment has described the case where the reinforcing sheet 26 is provided on the first intermediate layer 14, but the present invention is not limited to this. The reinforcing sheet 26 may be provided on the second intermediate layer 16, or may be provided on the first intermediate layer 14 and the second intermediate layer 16.

本実施形態に係る無端ベルト１０は、５層構造である場合について説明したが、少なくとも心体層１２、第１中間層１４、第１表面層１８を備えていれば足り、３層、４層、又は６層以上の構造でもよい。 Although the case where the endless belt 10 according to the present embodiment has a five-layer structure has been described, it is sufficient that the endless belt 10 has at least a heart body layer 12, a first intermediate layer 14, and a first surface layer 18, and three layers and four layers. , Or a structure having 6 or more layers may be used.

補強シート２６は、編布である場合について説明したが、例えば、ポリエステル樹脂、ナイロン樹脂、又はアラミド樹脂のシートを用いてもよい。この場合、補強シート２６は、空隙２８として厚み方向に貫通した穴を有する。穴の形状は、円形、楕円形、多角形とすることができる。補強シート２６は、厚み方向からみた、単位面積当たりの空隙２８の割合が３５％以上７０％以下であることによって、上記実施形態と同様の効果を得ることができる。 Although the case where the reinforcing sheet 26 is a knitted fabric has been described, for example, a polyester resin, nylon resin, or aramid resin sheet may be used. In this case, the reinforcing sheet 26 has a hole that penetrates in the thickness direction as a gap 28. The shape of the hole can be circular, oval, or polygonal. The reinforcing sheet 26 can obtain the same effect as that of the above embodiment when the ratio of the voids 28 per unit area is 35% or more and 70% or less when viewed from the thickness direction.

１０ 無端ベルト
１２ 心体層
１４ 第１中間層
１５ 継手部
１６ 第２中間層
１８ 第１表面層
１９ 凹部
２０ 第２表面層
２１ 凸部
２２ 第１端部
２４ 第２端部
２６ 補強シート
２７ 表面側中間部
２８ 空隙
２９ 心体側中間部
３１ 接続部
３３ 分離部 10 Endless belt 12 Core layer 14 First intermediate layer 15 Joint part 16 Second intermediate layer 18 First surface layer 19 Recessed 20 Second surface layer 21 Convex part 22 First end part 24 Second end part 26 Reinforcing sheet 27 Surface Side middle part 28 Void 29 Mind body side middle part 31 Connection part 33 Separation part

Claims (6)

心体層と、
熱可塑性樹脂で形成され、前記心体層の一方の表面に設けられた第１中間層と、
前記第１中間層の表面に設けられた第１表面層と、
互いに相補的な形状を有する第１端部と第２端部が接合された継手部と
を備えた、無端ベルトであって、
前記第１端部と前記第２端部の間の前記第１中間層に埋設された補強シートを備え、
前記補強シートは、厚み方向に貫通した空隙を有し、
前記第１中間層は、
前記補強シートの前記第１表面層側に配置される表面側中間部と、
前記補強シートの前記心体層側に配置される心体側中間部と、
前記空隙を通じて前記表面側中間部と前記心体側中間部とをつなぐ接続部と
を有する
無端ベルト。 With the mind and body layer
A first intermediate layer formed of a thermoplastic resin and provided on one surface of the core body layer,
The first surface layer provided on the surface of the first intermediate layer and
An endless belt having a first end portion having a complementary shape to each other and a joint portion to which the second end portion is joined.
A reinforcing sheet embedded in the first intermediate layer between the first end and the second end is provided.
The reinforcing sheet has a gap penetrating in the thickness direction.
The first intermediate layer is
A surface-side intermediate portion arranged on the first surface layer side of the reinforcing sheet and
An intermediate portion on the psychic body side arranged on the psychic body layer side of the reinforcing sheet,
An endless belt having a connecting portion that connects the surface-side intermediate portion and the mind-body-side intermediate portion through the gap. 厚み方向からみた、前記補強シートにおける単位面積当たりの前記空隙の割合が３５％以上７０％以下である、請求項１に記載の無端ベルト。 The endless belt according to claim 1, wherein the ratio of the voids per unit area in the reinforcing sheet is 35% or more and 70% or less when viewed from the thickness direction. 前記第１端部及び前記第２端部は、互いに相補的な複数の凹部及び凸部を有し、
前記補強シートは、前記第１端部の凹部の基端から、前記第２端部の凹部の基端までの長さよりも長い領域に配置されている、請求項１又は２に記載の無端ベルト。 The first end portion and the second end portion have a plurality of concave portions and convex portions complementary to each other.
The endless belt according to claim 1 or 2, wherein the reinforcing sheet is arranged in a region longer than the length from the base end of the concave portion of the first end portion to the base end of the concave portion of the second end portion. .. 熱可塑性樹脂で形成され、前記心体層の他方の表面に設けられた第２中間層と、
前記第２中間層の表面に設けられた第２表面層と
を備え、
前記第２表面層は、駆動プーリに接触可能である、請求項１〜３のいずれか１項に記載の無端ベルト。 A second intermediate layer formed of a thermoplastic resin and provided on the other surface of the mind body layer,
A second surface layer provided on the surface of the second intermediate layer is provided.
The endless belt according to any one of claims 1 to 3, wherein the second surface layer is in contact with a drive pulley. 前記補強シートは、編布である、請求項１〜４のいずれか１項に記載の無端ベルト。 The endless belt according to any one of claims 1 to 4, wherein the reinforcing sheet is a knitted fabric. 心体層と、
熱可塑性樹脂で形成され、前記心体層の一方の表面に設けられた第１中間層と、
前記第１中間層の表面に設けられた第１表面層と
を備えた帯状ベルトの
長手方向の第１端部及び第２端部における前記第１中間層に、それぞれ先端から長手方向に切り込みを入れ、前記第１中間層を、前記第１表面層に一体化された表面側中間部と、前記心体層に一体化された心体側中間部とに分離する工程と、
前記第１端部と前記第２端部を、互いに相補的な形状に加工する工程と、
突き合わせた状態の前記第１端部と前記第２端部にまたがるように、前記心体側中間部の表面に、厚み方向に貫通した空隙を有する補強シートを配置する工程と、
前記第１表面層に一体化された前記表面側中間部及び前記第１表面層で前記補強シートを覆い、前記表面側中間部と前記心体側中間部が前記空隙を通じて一体となるように、前記第１端部と前記第２端部を接合する工程と
を備える、無端ベルトの製造方法。 With the mind and body layer
A first intermediate layer formed of a thermoplastic resin and provided on one surface of the core body layer,
A notch is made in the longitudinal direction from the tip of the first intermediate layer at the first end portion and the second end portion in the longitudinal direction of the belt-shaped belt provided with the first surface layer provided on the surface of the first intermediate layer. A step of separating the first intermediate layer into a surface-side intermediate portion integrated with the first surface layer and a mind-body-side intermediate portion integrated with the mind-body layer.
A step of processing the first end portion and the second end portion into shapes complementary to each other,
A step of arranging a reinforcing sheet having a gap penetrating in the thickness direction on the surface of the intermediate portion on the mind body side so as to straddle the first end portion and the second end portion in a butt state.
The reinforcing sheet is covered with the surface-side intermediate portion and the first surface layer integrated with the first surface layer, and the surface-side intermediate portion and the mind-body-side intermediate portion are integrated through the voids. A method for manufacturing an endless belt, comprising a step of joining the first end portion and the second end portion.
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