| 摘要 |
<p>1311551 Pneumatic tyres; cord laying machines DEERINGMILLIKEN RESEARCH CORP 1 April 1970 [2 April 1969] 15482/70 Heading B7C An endless reinforcement strip for a pneumatic tyre comprises continuous cord, Fig. 1, zigzagging from edge to edge, the lengths of said cord between reversals being interleaved with lengths disposed at an opposite angle along at least one line substantially parallel to and intermediate the edges of the strip and the relationship between the parameters of the strip being where C is the circumference of the reinforcement, A is the smaller angle between the cord and the edge of the reinforcement, W is the width of the reinforcement measured perpendicular to the edges, EP1 is the number of cords per inch measured perpendicular to the cord lengths, P is an integer and equal to one plus the total number of interleaving lines parallel to and intermediate the edges of the reinforcement, e.g. 13, Fig. 1 (not shown), M and D are two integers having no common factor and which render an integer with D being less than P, and D and P have no common factor, and GR is the number of repeating cycles of the cord from one edge and back to the same edge for each circumference of the reinforcement. The cord reversals may lie at varying distances from the strip's centre line. The reinforcement strip may form a breaker or carcase ply, wound upon or applied in flat-band form to a cylindrical or expanded carcase. A cord-winding drum 31, Fig. 4, and a barrel cam 40 are rotated by a motor 35 acting through a gear train 41 including a differential adder 54, and a gear-box 38. A cord guide means 33 is reciprocated across the drum's width by means of cam 40, to lay the cord on the inside or outside of the drum. Several cords may be applied simultaneously. The cord angle relative to the strip's centre line is between 45 and 80 degrees prior to expansion of the cylindrical carcase, and between 5 and 35 degrees after expansion. The cords are of glass fibre, rayon, polyester, nylon, cotton, or metal, and may be covered with plastics or rubber extruded around them immediately before their application. The breaker may be located between rubber shoulder portions of the tyre.</p> |
