Camber Profile Providing Rubber-Covered Pressure Rollerswith Uniform Load Distribution.

Abstract

In the previous paper camber profiles of a covering which provides uniform load distribution are derivedtheoretically for rubber-covered pressure rollers. However, it is not easy to grind precisely rubber coveringsaccording with a complex theoretical curve. When actually designing pressure rollers, sufficient data are notoften available to calculate the theoretical surface cambering. Therefore, some approximate profiles are desirablefor practical purposes in industry. In this paper approximations of camber profile are considered and thedegree of uniformity of load distribution is revealed for each profile. Theoretical considerations are also givento cambering of mandrels of covered rollers and surface cambering of steel rollers which provide uniform loaddistribution.The following is a summary of the conclusions obtained from the present study : (1) When the sufficient data are not available to design the theoretical camber profile, some approximatecamber profiles can be determined and the load distribution of the pressure rollers with the approximate camberprofile is satisfactorily uniform in practical use. (2) Rollers with a trapezoidally cambered covering are less uniform in load distribution than rollers withapproximate camber profile given by a biquadratic algebraic curve. Uniformity of load distribution of triangularcambered rollers is also lower than that of trapezoidally cambered rollers. (3) When the load on the pressure rollers vary widely, there is no appreciable difference in the uniformity ofload distribution between the theoretical camber profile and the approximate camber profiles. (4) Cambering of mandrels of covered rollers and surface cambering of steel rollers are also effective to makeload distribution rigorously uniform. The camber profile of steel rollers is independent of thickness and elasticityof the coverings of rubber-covered rollers.