Method of making power transmission belts

Abstract

Abstract An extruded or calendered sheet of vulcanizable rubber is treated by passing it between the nip of a smooth roller and a circumferentially grooved roller with a fabric being fed to the sheet on the grooved roller side in order to impart to the rubber sheet and the fabric a series of continuous closely spaced longitudinally-extending ribs. The formed sheet is then cut transversely into desired belt circumference lengths and the cut ends are brought together to form a continuous band-like belt carcass with the ribbed surface facing inwardly. The carcass is positioned over tensioning rollers each of which has accommodating grooves for the ribs and the spacings there between, and the carcess is tensioned while a reinforcing cord of low extensibility is wrapped around the carcass preferable, but not necessarily, as a continuous helical spiral winding. A layer of a fabric coated with vulcanixable rubber stock is applied over the tension cord members on the exterior or non-grooved side, and the resulting assembly is cut along longitudinally spaced lines located between the ribs and extending inwardly into the rubber underlying the tension members, but leaving a rubber and/or fabric layer connecting the ribs together. An additional fabric layer is applied over the previously cut fabric in order to facilitate the transfer of the bandlike carcass off the tension rollers. The resultant carcass with the outer fabric is subjected to pressure-forming and curing and then severed to form individual belts.

Inventors

• 👤 M Arnao
• 👤 L Grecco

Bibliographic Details