Modern industrial sewing machines are generally still powered by a belt that passes through the table, though now the belt leads instead to a large servo motor slung to the table's underside. But that does leave the machine heads more-or-less compatible with the old treadle tables
Is that pedal set up up to drive the machine, or is it just for looks?
It would have originally powered the machine, but someone has swapped the old foot powered machine for a more modern electric unit.
Modern industrial sewing machines are generally still powered by a belt that passes through the table, though now the belt leads instead to a large servo motor slung to the table's underside. But that does leave the machine heads more-or-less compatible with the old treadle tables