1A beam supporting or carrying rollers, especially in a loom or similar machine; (also) each of two slowly rotating horizontal beams in a loom between which cloth is transferred as weaving progresses.
2A beam supported on rollers.
Origin
Early 19th century; earliest use found in The Repertory of Arts.
Definition of roller beam in US English:
roller beam
noun
Manufacturing Technology
1A beam supporting or carrying rollers, especially in a loom or similar machine; (also) each of two slowly rotating horizontal beams in a loom between which cloth is transferred as weaving progresses.
2A beam supported on rollers.
Origin
Early 19th century; earliest use found in The Repertory of Arts.