A helical toothed belt includes: a back portion in which a tension member is buried and; a plurality of tooth portions arranged on one surface of the back portion with inclination to a belt width direction, in which a surface of the tooth portion and a portion of the one surface of the back portion are formed of a tooth fabric, the other surface of the back portion is formed of a back fabric, the plurality of tooth portions have a tooth pitch of 2 mm or more and 5 mm or less, and the tension member is a twisted cord containing a high-strength glass fiber or a carbon fiber and having a diameter of 0.2 mm or more and 0.6 mm or less.

A helical toothed belt includes: a back portion in which a tension member is buried and; a plurality of tooth portions arranged on one surface of the back portion with inclination to a belt width direction, in which a surface of the tooth portion and a portion of the one surface of the back portion are formed of a tooth fabric, the other surface of the back portion is formed of a back fabric, the plurality of tooth portions have a tooth pitch of 2 mm or more and 5 mm or less, and the tension member is a twisted cord containing a high-strength glass fiber or a carbon fiber and having a diameter of 0.2 mm or more and 0.6 mm or less.

A synchronous belt having a tensile member layer with a tensile member embedded in an elastomeric body, a toothed surface with a plurality of regularly spaced, transverse teeth protruding from the body, a jacket covering the toothed surface, and a unidirectional fabric layer suspended in the belt between the jacket and the tensile member layer and following the approximate contour of the jacket.

A synchronous belt having a tensile member layer with a tensile member embedded in an elastomeric body, a toothed surface with a plurality of regularly spaced, transverse teeth protruding from the body, a jacket covering the toothed surface, and a unidirectional fabric layer suspended in the belt between the jacket and the tensile member layer and following the approximate contour of the jacket.

A synchronous belt with a tensile member layer having a tensile member embedded in an elastomeric body; a toothed surface with a plurality of regularly spaced, transverse teeth protruding from the body; and a jacket covering the toothed surface; wherein the teeth comprise a plurality of fabric insert layers that increase the stiffness of the tooth, the insert layers separated from each other by layers of an elastomer composition. The layers may be oriented parallel to the tensile member layer, perpendicular to the tensile member, or following the contour of the tooth. The layers may be a single piece of fabric folded into layers, or separate pieces of fabric.

A synchronous belt with a tensile member layer having a tensile member embedded in an elastomeric body; a toothed surface with a plurality of regularly spaced, transverse teeth protruding from the body; and a jacket covering the toothed surface; wherein the teeth comprise a plurality of fabric insert layers that increase the stiffness of the tooth, the insert layers separated from each other by layers of an elastomer composition. The layers may be oriented parallel to the tensile member layer, perpendicular to the tensile member, or following the contour of the tooth. The layers may be a single piece of fabric folded into layers, or separate pieces of fabric.

A V-ribbed belt in which a friction transmission surface of a compression rubber layer is coated with a knit fabric is provided. The compression rubber layer is formed of the cured product of a rubber composition containing an ethylene-?-olefin elastomer and carbon black wherein the carbon black contains a soft carbon having a primary particle diameter of at least 40 nm and a hard carbon having a primary particle diameter of less than 40 nm. The ratio between the number of particles of the soft carbon and hard carbon is former/latter=3/97 to 25/75.

A V-ribbed belt in which a friction transmission surface of a compression rubber layer is coated with a knit fabric is provided. The compression rubber layer is formed of the cured product of a rubber composition containing an ethylene-?-olefin elastomer and carbon black wherein the carbon black contains a soft carbon having a primary particle diameter of at least 40 nm and a hard carbon having a primary particle diameter of less than 40 nm. The ratio between the number of particles of the soft carbon and hard carbon is former/latter=3/97 to 25/75.

The present invention provides a belt for a textile machine capable of reducing running noise caused during belt running. A canvas core used in the belt is constituted by a woven fabric based on a twill weave texture in which a warp crosses a plurality of wefts and aggregates (19) of weave points at which the warp crosses the wefts are regularly shifted in one longitudinal direction (L) of the belt to form a twill line (17), and some of the aggregates (19) in the twill line (17) are shifted at a predetermined interval in the opposite direction to the one longitudinal direction.

The present invention provides a belt for a textile machine capable of reducing running noise caused during belt running. A canvas core used in the belt is constituted by a woven fabric based on a twill weave texture in which a warp crosses a plurality of wefts and aggregates (19) of weave points at which the warp crosses the wefts are regularly shifted in one longitudinal direction (L) of the belt to form a twill line (17), and some of the aggregates (19) in the twill line (17) are shifted at a predetermined interval in the opposite direction to the one longitudinal direction.