Remove time signature, keep barlines
The following lines create a new staff without the time signature mark but they do print the barlines, which are positioned manually in the example.
\version "2.24.0"
%% http://lsr.di.unimi.it/LSR/Item?id=165
%LSR odified by P.P.Schneider on Feb.2014
\score{
\new Staff
\with {
\omit TimeSignature
% or:
%\remove "Time_signature_engraver"
}
{
c' d' e' f' g' f' e' d' c'
}
}