  We experimentally demonstrate temporal pumping of elastic waves in an
electromechanical waveguide. An aluminum beam covered by an array of
piezoelectric patches connected to shunt circuits with controllable resistances
enables the spatial and temporal control of the beam's stiffness. The spatial
modulation produces non-trivial edge states, while a smooth temporal variation
of the modulation phase drives the transfer of edge states from one boundary of
the waveguide to the other in a controllable manner. This characteristic
behavior for a topological pump is here demonstrated for the first time in a
continuous elastic waveguide. The framework presented herein opens new avenues
for the manipulation and transport of information through elastic waves, with
potential technological applications for digital delay lines and digitally
controlled waveguides. Our study also explores higher dimensional topological
physics using time as a synthetic dimension in electromechanical systems.
