Roller train and substrate conveying device

A roller train for conveying a substrate, comprising:

• a first roller comprising a first delimitation part, and
• a second roller comprising a second delimitation part,
• wherein an axial line of a first axis of the first roller is parallel to that of a second axis of the second roller, the first roller contacts an upper surface of the substrate, the second roller contacts a lower surface of the substrate, and
• the first delimitation part is arranged on the first axis of the first roller and configured to delimit an axial displacement of the first roller, the second delimitation part is arranged on the second axis of the second roller and configured to delimit an axial displacement of the second roller, the first delimitation part and the second delimitation part cooperate with each other to prevent misalignment between the first roller and the second roller,
• wherein the second delimitation part is located at a first side of the second roller and comprises a second delimitation body, a first delimitation plate and a second delimitation plate,
• the first delimitation plate is arranged on a first side of the second delimitation body, and the second delimitation plate is arranged on a second side of the second delimitation body, and the second delimitation body, the first delimitation plate and the second delimitation plate are sleeved onto the second axis of the second roller, and
• the second delimitation body, the first delimitation plate and the second delimitation plate are ring-shape structures and form a groove structure together, the first delimitation part is inserted into the groove structure and is displaceable axially inside the groove structure.