摘要:
For the purpose of carrying out the butt-end joining of two lengths (35, 36) of a rubberized fabric, in particular, reinforced with cords disposed parallelly at the edge to be jointed, there is foreseen a stitching device (1) which comprises two superimposed pairs of frusto-conical rollers (26,27; 20,21) having their lateral surfaces tangent to the very same horizontal plane, and opposing pairs of rollers (26,21; 27,20) in the vertical plane, with their axes of rotation being symmetrically inclined, with respect to the tern of planes comprised by a first horizontal plane (h-h), or the resting plane for the lengths to be jointed, by a second vertical plane (m-m) that contains the seam-line of said lengths, and by a third vertical plane, orthogonal to both the two above-said planes. Owing to the inclination of the axes, the pairs of the vertically opposite rollers grasp each border (E, U) of the lengths to be jointed, on both the surfaces, in correspondence of a narrow transversal portion of said fabric. Thereupon, they take said narrow transversal portion of the border, and press it against the facing border, with shifting said narrow portion progressively and with continuity, along the entire length of the seam-line.
摘要:
The metal core used for reinforcing tire beads is constituted by a plurality of coils of wire (16), (17), (18), axially arranged side-by-side and radially superimposed, in which the wire has a straight section of modular shape with two equal and parallel opposite sides (1), (2), the profiles (15) connecting the corresponding ends of the opposite sides having a distance, from the axis of said pair of sides, whose value varies from one side to the other, said variation comprising at least one inversion of value along the development of the profile.
摘要:
Tyre with radial carcass having a breaker structure that comprises two radially overlapped layers (1,2) of metallic fabric reinforced by cords transversally disposed in respect to the circumferential direction of the tyre and crossed together and, on each extremity of said couple of layers, at least a rubberized fabric strip 3 reinforced by metallic cords of high elongation (HE) or very high elongation (VHE) eventually in combination with Hybrid textile cords (Aramide/Polyamide) disposed according to the circumferential direction and having, in the vulcanized tyre, a modulus of elongation of non-increasing value passing from the axially outermost cord to the axially innermost one. Said strip 3 is suitably realized by the coupling of cords (axially from the outside to the inside) HE-VHE (High Elongation - Very High Elongation), HE-Hybrid (High Elongation - Aramide/Polyamide) and VHE-Hybrid.
摘要:
For eliminating the burrs which form on moulded, or injected products, the moulding device and, in particular, the tyre vulcanizing mould is provided with a plastically and elastically deformable portion (13) on the coupling surface existing between the corresponding elements; so much so that the reciprocal coupling, between the facing surfaces, is not simultaneous, but involves a portion of surface having an amplitude that increases in its size, during the shutting movement of the mould.
摘要:
The invention concerns a tyre, especially suited for motorcycles, that is capable of high performances during racing competitions, due to the high rigidity of the tyre sidewall which permits considerable increases in speed in cornering. The said tyre presents, in correspondence of the radially inner portion of the sidewall and in a straight section, the profile of the carcass plies and of the axially inner surface, concave inwardly, together with the profile of the axially outer surface, concave outwardly.
摘要:
The present invention concerns a tyre for vehicle wheels, intended for being used for sports events and for high performances, that is capable of guaranteeing - under any running conditions - of time, as well as of the road, the best road-behaviour characteristics. The tyre of the invention presents a tread pattern that is axially subdivided into two circumferential adjacent sections of blocks (12,13,14) and grooves (16,17) respectively; and a tread-band - comprised by two circumferential portions (10, 11) that are axially adjacent, made from diverse elastomeric compositions and having a diverse thickness where the line of separation between the two sections of the pattern, does not coincide with the line of separation between the two portions made of elastomeric compositions. The said tread-band is supported by a mixed textile/ metallic breaker structure (4, 5), having an asymmetrical profile - with respect to the equatorial plane of the tyre.
摘要:
The translator-device-that, in particular, is applied to a plant for producing rubberized fabric-tapes which have their cords disposed transversally to the longitudinal direction of the tape itself; takes from a first device (1), strips (33) cut off from a piece of fabric, substantially in a perpendicular direction to that of the reinforcing cords and, through the means of a grasping device (11) provided with needles (24), apt for opposing any friction between the rubberized fabric-strips and the supporting surfaces for these strips, and also capable of ensuring a correct pre-determined orientation of the strips, transfers the strips to a second device (2) having an orthogonal advancing direction with respect to that of the first device, whereon the strips are jointed together - along their borders which are parallel to the inclination of the cords.