  We study how the electromagnetic structure of the nucleon is influenced by a
pion cloud. To this aim we make use of a constituent-quark model with
instantaneous confinement and a pion that couples directly to the quarks. To
derive the invariant 1- photon-exchange electron-nucleon scattering amplitude
we employ a Poincar\'e- invariant coupled-channel formulation which is based on
the point-form of relativistic quantum mechanics. We argue that the
electromagnetic nucleon current extracted from this amplitude can be
reexpressed in terms of pure hadronic degrees of freedom with the quark
substructure of the pion and the nucleon being encoded in electromagnetic and
strong vertex form factors. These are form factors of bare particles, i.e.
eigenstates of the pure confinement problem. First numerical results for (bare)
photon-nucleon and pion-nucleon form factors, which are the basic ingredients
of the further calculation, are given for a simple 3-quark wave function of the
nucleon.
