Kinematic synthesis, analysis and conditions of the motion transmission in clutch-free presses at the idle mode

The article proposes a refined two-stage method for synthesizing a third-class lever mechanism for the implementation of the idle operation of a clutch-free mechanical press, which guarantees the assembly of this mechanism at full angle of rotation of the input crank.

The first stage determines the upper extreme position of the slider occupied during the press idle stroke, using a conditional four-bar linkage and an auxiliary coordinate system and also locations of the slider guide and the ordinate axes of the main coordinate system are found. The second stage of synthesis is conducted in accordance with design methods for mechanisms with an approximate dwell, based on the utilization of their extreme positions. The authors derive analytical relations to evaluate the magnitude of small displacements (oscillations) of the slider during the press idle stroke and the conditions of motion transmission.

Moreover, the authors demonstrate the example that confirms the possibility of implementing the idle mode of operation of a mechanical non-clutch press with a third-class lever mechanism of the same parameters assuming ts synthesis for the operating mode. The research demonstrates the possibility of obtaining minor fluctuations of the working slider in the idle mode of the press and also presents acceptable pressure angle modes.

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