Printer / plotter comprising: - a feed mechanism with a feed roller which is provided to extend substantially laterally at the same height as an upper surface of an impression cylinder and a plurality of laterally aligned roller by above said feed roll and each having a rotatable pinch roller, wherein the feed roller and the pinch rollers clamp in between one sheet-like medium placed on said impression cylinder to advance the medium type sheet in the anteroposterior direction; - a guide rail extending laterally above said cylinder parallel to said feed roller printing; and - a slide which is supported on said guide rail so that said slide can be displaced laterally by said guide rail, wherein each of the roller assemblies mentioned has a lever which can be moved laterally pivotally, changing the lock status of said sheet-like between said pressure roller and said feed roller according to the angular position of said lever means, wherein said slider has an arm which can move between a position coupling on said arm engaging said lever to pivotally move said lever when said slider is displaced laterally by said guide rail, and a standby position where said arm is not engaged with said lever to traverse said lever when said slider is displaced laterally by said guide rail, and where can camb iar lock status of said sheet-like medium by said roller assembly moving said arm between said engaging position and said standby position while said slide moves along said guide rail to adjust the angular positions of said lever.
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