Abstract: A device for crimping synthetic thread bundles or strips has a machine frame, two rollers supported in a machine frame and forming between their jacket a narrow roller gap for delivering a thread bundle or strip, with the first roller provided on its face ends with edge disks which embrace the second roller with slight play and form there, between an annular channel, the edge disks having inside faces forming two opposed boundary faces, a compression chamber having a rectangular cross-section, enclosed by boundary faces, and located in the annular channel between the edge disks, an outer adapter contacting the second roller in scrapper like fashion, engaging the annular channel and having a wall face oriented toward the first roller and forming a third boundary face of the compression chamber, and drive mechanisms provided for the two rollers and having motors which are designed for a circumferential speed of the rollers of up to at least 1,000 m/min.