One automatic silks and satins straightener is promptly provided to the correct deformation of silks and satins, by installing other straightening unit and detection unit, thus the minimization loss of cloth and improvement straightening performance. Oblique roller (30) and bow roller (40) are straightened cloth, when, upon rotating. Multiple guide rolls (50) instruct cloth. The cloth of one detection unit (60) detection alignment. One controller (120) is according to a detection signal control oblique roller and bow roller. Second straightening unit (140) is formed under detection unit, is had the second oblique roller (150), is used for the secondary cloth for straighteing and being mainly straightened. Second detection unit (160) is formed under the second oblique roller, has a luminous component (161) and a light receiving part (162), is used to detect the cloth of secondary alignment and is exported a detection signal to controller.
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