| 摘要 |
A belt roller adjustment device of belt sander comprises a sanding belt attached to the driving roller and the driven roller having a main shaft fastened to support rods having inner end portions thereof being threaded and fitted over with tubular sleeves. Two cams are used to urge the inner end portions of the tubular sleeves so as to exert a force on support rods to actuate the driven roller to move outwardly in order to tighten the sanding belt with speed and precision.
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