KINEMATIC PROPERTIES OF THE ECCENTER MECHANISM OF A HEDGE TRIMMER
Published in GÉP 2025/2
https://doi.org/10.70750/GEP.2025.2.6
Siktár Bálint
PhD student, University of Miskolc
Dr. Kakuk József
Associate professor, University of Miskolc
Dr. Hegedűs György
Associate professor, University of Miskolc
ABSTRACT
Cam–follower mechanisms remain essential across automotive, industrial, and handheld power tools; here, the authors analyse the twin-eccentric cam–slot drive of a hedge trimmer. A compact kinematic model was derived that yields displacement, velocity, acceleration, and jerk (S-V-A-J) of the reciprocating blades from the shaft angle and speed. The transmission employs two equal-radius discs on a standard shaft with opposite eccentricities that run-in conjugate slots at the blade roots, enforcing synchronised, counter-phase motion. Closed-form relations are obtained for disc centre trajectories and constrained blade motion under vertical guidance, enabling frequency-dependent evaluation of S-V-A-J characteristics.
