| 摘要 |
A sheet-fed printing press includes stationary guide means for guiding said control cams in the axial direction of the turn-over drum, switching cam followers respectively provided on the control cams in such a manner as to protrude radially outwardly therefrom, sliders respectively forming therein camming recesses to be respectively engaged with said switching cam followers, and a slider driving means for reciprocatingly driving the sliders in such a manner as to enable the switching cam followers to reciprocatingly travel in the axial direction of the turn-over drum. The switching cam followers each travel from a first end to a second end of a corresponding one of said camming recesses along the longitudinal axis thereof for switching to the both-side printing operation, and each travel from said second end to said first end of said corresponding one of said camming recesses along the longitudinal axis thereof for switching to the single-side printing operation. The first and second ends along the longitudinal axis of each camming recess respectively have end walls adapted to press a corresponding one of said switching cam followers, so that the control cams are respectively biased against the stationary guide means in the direction substantially orthogonal to the axial direction of the turn-over drum.
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