The present invention relates to a tension control device of the filament winding machine, and to maintain a constant tension of the composite material design value, which is the core technology of the composite molding machine.;The present invention is a device body (10) for winding and forming a filament (composite material) (1) that can be applied to the power and exhibit a high performance high strength on the surface of the material (not shown), and the support of the device body (10) The main frame 12 is installed in the frame 11 and the spool 20 in which the filament 1 of a predetermined length is wound and the filament 1 of the spool 20 is moved to one side at a specific speed. And a tension change amount sensor 40 installed at the rear side of the tension change means 30, a tension change amount sensor 40 for detecting a tension change amount (moving speed change amount) of the filament 1, and the tension change amount detector. The rear side of the guide roller 45, which is the rear side of the 40, the mandrel (Mandrel) 50, the filament 1 is wound to an appropriate thickness and the tension change sensor 40 is applied to the variable tension It consists of a control unit 60 for controlling the change means (30).
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