Design of Innovative Pulse Thresher

Abstract

In manual pulse thresher, input rotary motion is converted into reciprocating motion of beaters. Due to indefinite swing angle of beaters usual four bar linkage cannot be used for this purpose. In this proposed investigation, a novel mechanism has been designed to overcome the problem of indefinite swing angle as is necessary for meaningful operation of manual pulse thresher. Here, Grash of mechanism has been modified to generate the desired kinematics. At first, particular four bar linkage satisfying Grash of’s criteria has been designed considering definite swing angle of beaters, followed by a suitably designed slot has been incorporated into the coupler design to obtain indefinite swing angle. This modified linkage mechanism has been tested successfully to generate variable (may vary even on every cycle) swinging of beaters while taking rotary motion as input.