Abstract: A cord aligning device formed with a plurality of guide holes allowing cords to be separately inserted therethrough is provided. Each of the guide holes includes a feed port into which a cord is fed, a delivery port from which the cord is delivered, an introducing portion provided continuously with the feed port, and a delivery portion provided between the introducing portion and the delivery port. The introducing portion is formed such that the area of a cross-section vertical to a centerline thereof is reduced gradually toward the delivery portion from the feed port, the area of a cross-section of the delivery portion vertical to a centerline thereof is uniform along the centerline over its total length, and the delivery portion is formed in a linear fashion. Moreover, the delivery portions of the plurality of guide holes are juxtaposed in a predetermined direction so as to form rows parallel to each other.

Abstract: A cord aligning device formed with a plurality of guide holes allowing cords to be separately inserted therethrough is provided. Each of the guide holes includes a feed port into which a cord is fed, a delivery port from which the cord is delivered, an introducing portion provided continuously with the feed port, and a delivery portion provided between the introducing portion and the delivery port. The introducing portion is formed such that the area of a cross-section vertical to a centerline thereof is reduced gradually toward the delivery portion from the feed port, the area of a cross-section of the delivery portion vertical to a centerline thereof is uniform along the centerline over its total length, and the delivery portion is formed in a linear fashion. Moreover, the delivery portions of the plurality of guide holes are juxtaposed in a predetermined direction so as to form rows parallel to each other.

Abstract: A cord aligning device formed with a plurality of guide holes allowing cords to be separately inserted therethrough is provided. Each of the guide holes includes a feed port into which a cord is fed, a delivery port from which the cord is delivered, an introducing portion provided continuously with the feed port, and a delivery portion provided between the introducing portion and the delivery port. The introducing portion is formed such that the area of a cross-section vertical to a centerline thereof is reduced gradually toward the delivery portion from the feed port, the area of a cross-section of the delivery portion vertical to a centerline thereof is uniform along the centerline over its total length, and the delivery portion is formed in a linear fashion. Moreover, the delivery portions of the plurality of guide holes are juxtaposed in a predetermined direction so as to form rows parallel to each other.

Abstract: The present invention provides a gear type extruder for rubber, which is capable of preventing deterioration of tire uniformity level such as RFV caused by pulse-like changes in rubber extrusion rate during extruding a ribbon-shaped rubber from the gear type extruder. Gears 11, 12, 21, 22 are structured as helical gears, of which flow rate profiles, representing temporal changes in discharge flow rate of rubber discharged by the tooth of respective gears, are respectively represented by a trapezoidal profile constituted of a flow rate monotonously increasing portion, a constant flow rate portion following the monotonously increasing portion, and a flow rate monotonously decreasing portion following the constant flow rate portion.

Abstract: Only an outer surface of an unvulcanized rubber sheet is preliminarily crosslinked by irradiating an infrared ray or a far infrared ray to the unvulcanized rubber sheet prior to subsequent final vulcanization, whereby the occurrence of rubber spew and rubber flash is considerably suppressed at the vulcanization step.