GB824718A - Arrangement for the intermittent drive of a shaft through a continuously rotating member - Google Patents

Abstract

824,718. Starting and stopping machinery; friction gearing. DE LENS, E. J. Oct. 21, 1957 [Oct. 29, 1956], No. 32790/57. Classes 80 (1) and 80 (2). A constantly rotating roller is pivotally mounted to engage the non-circular periphery of a driven wheel and is arranged to be moved away from the wheel before application of braking means on a large radius section of the wheel. An elastic roller 5 driven constantly by a motor 7, pivoted at 8, can be moved into frictional engagement with the rim 3 of a flywheel 2 rigid with a driven shaft 1. The rim 3 is formed of sectors of different radii, at point A the rim being of minimum radius increasing from A to the maximum at B which is retained to D and then decreases to the minimum at E which is retained to A. Also pivoted at 8 is a control lever 9 having an extension 15 carrying an elastic stop 16 which can engage a projection 20 carried by the flywheel, when the lever 9 rests against a stop 10. The lever 9 is also connected with the motor support by a spring 12, relative movement being limited by a stop 13. A brake 21 is pivoted at 23 and subject to the action of a spring 24, the brake being restrained by a stop 25 such that it can only engage the larger radius portion of the flywheel 2. In operation, a pull on a linkage 14 moves the lever 9 to rest on stop 11 and to load the spring 12 to swing the roller 5 into contact with the flywheel 2 at A, at the same time the stop 16 is released. The flywheel rotates at increasing speed until the maximum radius point B is reached, the increase in radius stressing the spring 12 such that if the linkage 14 has been released the lever 9 rests on stop 10 and the stop 16 moves into a position to engage the projection 20. When the roller 5 reaches the commencement of the section C the brake 21 engages the section B of maximum radius and commences to slow the flywheel when the roller reaches the section of decreasing radius. At D the roller ceases to drive the flywheel which is retarded by the brake 21 until the stop 16 meets the projection 20 when the flywheel is stopped. If the linkage 14 is not released the roller 5 continues to drive the flywheel at varying speeds as the stop 16 cannot engage the projection 20 and the spring 12 is stressed sufficiently to allow the roller to drive over the whole periphery of the rim. The rim may be profiled to provide more than one cycle per revolution.