Preventing damage to printed substrates conveyed in a printing system

A system, comprising:

• an image forming station, which is configured to apply droplets of one or more printing fluids to a target substrate, so as to form an image thereon;
• and
• a substrate conveyor, which comprises one or more perforated plates having multiple openings, and is configured to grip and move the target substrate to and from the image forming station for forming the image, the substrate conveyor comprising one or more rotatable elements, which are fitted in the respective openings, and are configured to provide mechanical support to the target substrate, wherein, when the target substrate moves over the one or more rotatable elements, at least one of the rotatable elements is configured to rotate in response to a physical contact with the target substrate by receiving a kinetic energy from the target substrate, wherein at least one of the perforated plates comprises (i) a bar positioned along a first axis, and (ii) at least first and second arms that are coupled to and extended from the bar along a second axis, different from the first axis.