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The purpose of this paper was to study and modify the interaction between wiper mechanism and billhook mechanism to solve wiping failure and rigid impact problems. Firstly, load-deformation of wiper was simulated. The results indicated that the stiffness of wiper along billhook shaft direction is 801.05N/mm and the interference between wiper and billhook should be in the range from 0.38mm to 0.59mm. Furthermore, under the maximum pressure, the angles of knife that was mounted on wiper, were changed with Oxy plane, Oxz plane and Oyz plane, which were 0.659°, 0.4759° and 0.4555°, respectively, so it gives a data support for knife installing compensation. Based on rigid-flexible collision theory, a new improved design with elastic billhook shaft system was introduced. The new design used a compression spring that enables the billhook to move elastically and slightly along the shaft direction. Meanwhile, the new billhook system would not affect billhook bevel gear’s movement, since the spring keeps the gear on its original position continuously. Simulation results demonstrated that the design could reduce initial contact force between wiper and billhook by 46.3% and 83.9% at wiping and return phases, respectively. Therefore, the design can decrease impact, and it has a theoretical advantage of increasing knotting rate. Finally, a prototype of the design was produced and its feasibility was verified by actual baling experiments.