On rotary printing presses, metal rims beside the gears on which the printing cylinder rides. The bearers make rolling contact for proper meshing of the driving gears when pressure was applied.
是轮转式印刷机上各圆筒两旁的金属边，在带动齿轮旁边，当圆筒加压转动时，它们互相接触，以确保带动轮的啮合。
On rotary printing presses, metal rims beside the gears on which the printing cylinder rides. The bearers make rolling contact for proper meshing of the driving gears when pressure was applied.
是轮转式印刷机上各圆筒两旁的金属边，在带动齿轮旁边，当圆筒加压转动时，它们互相接触，以确保带动轮的啮合。
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